diff options
Diffstat (limited to 'drivers/w1')
37 files changed, 5936 insertions, 1199 deletions
diff --git a/drivers/w1/Kconfig b/drivers/w1/Kconfig index 9adbb4f9047..6743bde038c 100644 --- a/drivers/w1/Kconfig +++ b/drivers/w1/Kconfig @@ -8,7 +8,7 @@ menuconfig W1 If you want W1 support, you should say Y here. This W1 support can also be built as a module. If so, the module - will be called wire.ko. + will be called wire. if W1 @@ -16,7 +16,7 @@ config W1_CON depends on CONNECTOR bool "Userspace communication over connector" default y - --- help --- + ---help--- This allows to communicate with userspace using connector. For more information see <file:Documentation/connector/connector.txt>. There are three types of messages between w1 core and userspace: diff --git a/drivers/w1/masters/Kconfig b/drivers/w1/masters/Kconfig index c4493091c65..1708b2300c7 100644 --- a/drivers/w1/masters/Kconfig +++ b/drivers/w1/masters/Kconfig @@ -12,7 +12,7 @@ config W1_MASTER_MATROX using Matrox's G400 GPIO pins. This support is also available as a module. If so, the module - will be called matrox_w1.ko. + will be called matrox_w1. config W1_MASTER_DS2490 tristate "DS2490 USB <-> W1 transport layer for 1-wire" @@ -22,11 +22,11 @@ config W1_MASTER_DS2490 for example DS9490*. This support is also available as a module. If so, the module - will be called ds2490.ko. + will be called ds2490. config W1_MASTER_DS2482 tristate "Maxim DS2482 I2C to 1-Wire bridge" - depends on I2C && EXPERIMENTAL + depends on I2C help If you say yes here you get support for the Maxim DS2482 I2C to 1-Wire bridge. @@ -34,9 +34,14 @@ config W1_MASTER_DS2482 This driver can also be built as a module. If so, the module will be called ds2482. +config W1_MASTER_MXC + tristate "Freescale MXC 1-wire busmaster" + depends on ARCH_MXC || COMPILE_TEST + help + Say Y here to enable MXC 1-wire host + config W1_MASTER_DS1WM tristate "Maxim DS1WM 1-wire busmaster" - depends on W1 && ARM help Say Y here to enable the DS1WM 1-wire driver, such as that in HP iPAQ devices like h5xxx, h2200, and ASIC3-based like @@ -44,13 +49,20 @@ config W1_MASTER_DS1WM config W1_MASTER_GPIO tristate "GPIO 1-wire busmaster" - depends on GENERIC_GPIO + depends on GPIOLIB help Say Y here if you want to communicate with your 1-wire devices using GPIO pins. This driver uses the GPIO API to control the wire. This support is also available as a module. If so, the module - will be called w1-gpio.ko. + will be called w1-gpio. + +config HDQ_MASTER_OMAP + tristate "OMAP HDQ driver" + depends on ARCH_OMAP + help + Say Y here if you want support for the 1-wire or HDQ Interface + on an OMAP processor. endmenu diff --git a/drivers/w1/masters/Makefile b/drivers/w1/masters/Makefile index 1420b5bbdda..c5a3e96fcba 100644 --- a/drivers/w1/masters/Makefile +++ b/drivers/w1/masters/Makefile @@ -5,5 +5,8 @@ obj-$(CONFIG_W1_MASTER_MATROX) += matrox_w1.o obj-$(CONFIG_W1_MASTER_DS2490) += ds2490.o obj-$(CONFIG_W1_MASTER_DS2482) += ds2482.o +obj-$(CONFIG_W1_MASTER_MXC) += mxc_w1.o + obj-$(CONFIG_W1_MASTER_DS1WM) += ds1wm.o obj-$(CONFIG_W1_MASTER_GPIO) += w1-gpio.o +obj-$(CONFIG_HDQ_MASTER_OMAP) += omap_hdq.o diff --git a/drivers/w1/masters/ds1wm.c b/drivers/w1/masters/ds1wm.c index 10211e49300..02df3b1381d 100644 --- a/drivers/w1/masters/ds1wm.c +++ b/drivers/w1/masters/ds1wm.c @@ -13,13 +13,15 @@ #include <linux/module.h> #include <linux/interrupt.h> +#include <linux/io.h> #include <linux/irq.h> #include <linux/pm.h> #include <linux/platform_device.h> -#include <linux/clk.h> #include <linux/err.h> #include <linux/delay.h> -#include <linux/ds1wm.h> +#include <linux/mfd/core.h> +#include <linux/mfd/ds1wm.h> +#include <linux/slab.h> #include <asm/io.h> @@ -32,6 +34,7 @@ #define DS1WM_INT 0x02 /* R/W interrupt status */ #define DS1WM_INT_EN 0x03 /* R/W interrupt enable */ #define DS1WM_CLKDIV 0x04 /* R/W 5 bits of divisor and pre-scale */ +#define DS1WM_CNTRL 0x05 /* R/W master control register (not used yet) */ #define DS1WM_CMD_1W_RESET (1 << 0) /* force reset on 1-wire bus */ #define DS1WM_CMD_SRA (1 << 1) /* enable Search ROM accelerator mode */ @@ -55,6 +58,7 @@ #define DS1WM_INTEN_ERSRF (1 << 5) /* enable rx shift register full int */ #define DS1WM_INTEN_DQO (1 << 6) /* enable direct bus driving ops */ +#define DS1WM_INTEN_NOT_IAS (~DS1WM_INTEN_IAS) /* all but INTR active state */ #define DS1WM_TIMEOUT (HZ * 5) @@ -62,42 +66,51 @@ static struct { unsigned long freq; unsigned long divisor; } freq[] = { - { 4000000, 0x8 }, - { 5000000, 0x2 }, - { 6000000, 0x5 }, - { 7000000, 0x3 }, - { 8000000, 0xc }, - { 10000000, 0x6 }, - { 12000000, 0x9 }, - { 14000000, 0x7 }, - { 16000000, 0x10 }, - { 20000000, 0xa }, - { 24000000, 0xd }, - { 28000000, 0xb }, - { 32000000, 0x14 }, - { 40000000, 0xe }, - { 48000000, 0x11 }, - { 56000000, 0xf }, - { 64000000, 0x18 }, - { 80000000, 0x12 }, - { 96000000, 0x15 }, - { 112000000, 0x13 }, - { 128000000, 0x1c }, + { 1000000, 0x80 }, + { 2000000, 0x84 }, + { 3000000, 0x81 }, + { 4000000, 0x88 }, + { 5000000, 0x82 }, + { 6000000, 0x85 }, + { 7000000, 0x83 }, + { 8000000, 0x8c }, + { 10000000, 0x86 }, + { 12000000, 0x89 }, + { 14000000, 0x87 }, + { 16000000, 0x90 }, + { 20000000, 0x8a }, + { 24000000, 0x8d }, + { 28000000, 0x8b }, + { 32000000, 0x94 }, + { 40000000, 0x8e }, + { 48000000, 0x91 }, + { 56000000, 0x8f }, + { 64000000, 0x98 }, + { 80000000, 0x92 }, + { 96000000, 0x95 }, + { 112000000, 0x93 }, + { 128000000, 0x9c }, +/* you can continue this table, consult the OPERATION - CLOCK DIVISOR + section of the ds1wm spec sheet. */ }; struct ds1wm_data { - void __iomem *map; - int bus_shift; /* # of shifts to calc register offsets */ + void __iomem *map; + int bus_shift; /* # of shifts to calc register offsets */ struct platform_device *pdev; - struct ds1wm_platform_data *pdata; - int irq; - int active_high; - struct clk *clk; - int slave_present; - void *reset_complete; - void *read_complete; - void *write_complete; - u8 read_byte; /* last byte received */ + const struct mfd_cell *cell; + int irq; + int slave_present; + void *reset_complete; + void *read_complete; + void *write_complete; + int read_error; + /* last byte received */ + u8 read_byte; + /* byte to write that makes all intr disabled, */ + /* considering active_state (IAS) (optimization) */ + u8 int_en_reg_none; + unsigned int reset_recover_delay; /* see ds1wm.h */ }; static inline void ds1wm_write_register(struct ds1wm_data *ds1wm_data, u32 reg, @@ -115,23 +128,39 @@ static inline u8 ds1wm_read_register(struct ds1wm_data *ds1wm_data, u32 reg) static irqreturn_t ds1wm_isr(int isr, void *data) { struct ds1wm_data *ds1wm_data = data; - u8 intr = ds1wm_read_register(ds1wm_data, DS1WM_INT); + u8 intr; + u8 inten = ds1wm_read_register(ds1wm_data, DS1WM_INT_EN); + /* if no bits are set in int enable register (except the IAS) + than go no further, reading the regs below has side effects */ + if (!(inten & DS1WM_INTEN_NOT_IAS)) + return IRQ_NONE; - ds1wm_data->slave_present = (intr & DS1WM_INT_PDR) ? 0 : 1; + ds1wm_write_register(ds1wm_data, + DS1WM_INT_EN, ds1wm_data->int_en_reg_none); - if ((intr & DS1WM_INT_PD) && ds1wm_data->reset_complete) - complete(ds1wm_data->reset_complete); + /* this read action clears the INTR and certain flags in ds1wm */ + intr = ds1wm_read_register(ds1wm_data, DS1WM_INT); - if ((intr & DS1WM_INT_TSRE) && ds1wm_data->write_complete) - complete(ds1wm_data->write_complete); + ds1wm_data->slave_present = (intr & DS1WM_INT_PDR) ? 0 : 1; + if ((intr & DS1WM_INT_TSRE) && ds1wm_data->write_complete) { + inten &= ~DS1WM_INTEN_ETMT; + complete(ds1wm_data->write_complete); + } if (intr & DS1WM_INT_RBF) { + /* this read clears the RBF flag */ ds1wm_data->read_byte = ds1wm_read_register(ds1wm_data, - DS1WM_DATA); + DS1WM_DATA); + inten &= ~DS1WM_INTEN_ERBF; if (ds1wm_data->read_complete) complete(ds1wm_data->read_complete); } + if ((intr & DS1WM_INT_PD) && ds1wm_data->reset_complete) { + inten &= ~DS1WM_INTEN_EPD; + complete(ds1wm_data->reset_complete); + } + ds1wm_write_register(ds1wm_data, DS1WM_INT_EN, inten); return IRQ_HANDLED; } @@ -142,61 +171,73 @@ static int ds1wm_reset(struct ds1wm_data *ds1wm_data) ds1wm_data->reset_complete = &reset_done; + /* enable Presence detect only */ ds1wm_write_register(ds1wm_data, DS1WM_INT_EN, DS1WM_INTEN_EPD | - (ds1wm_data->active_high ? DS1WM_INTEN_IAS : 0)); + ds1wm_data->int_en_reg_none); ds1wm_write_register(ds1wm_data, DS1WM_CMD, DS1WM_CMD_1W_RESET); timeleft = wait_for_completion_timeout(&reset_done, DS1WM_TIMEOUT); ds1wm_data->reset_complete = NULL; if (!timeleft) { - dev_err(&ds1wm_data->pdev->dev, "reset failed\n"); + dev_err(&ds1wm_data->pdev->dev, "reset failed, timed out\n"); return 1; } - /* Wait for the end of the reset. According to the specs, the time - * from when the interrupt is asserted to the end of the reset is: - * tRSTH - tPDH - tPDL - tPDI - * 625 us - 60 us - 240 us - 100 ns = 324.9 us - * - * We'll wait a bit longer just to be sure. - */ - udelay(500); - - ds1wm_write_register(ds1wm_data, DS1WM_INT_EN, - DS1WM_INTEN_ERBF | DS1WM_INTEN_ETMT | DS1WM_INTEN_EPD | - (ds1wm_data->active_high ? DS1WM_INTEN_IAS : 0)); - if (!ds1wm_data->slave_present) { dev_dbg(&ds1wm_data->pdev->dev, "reset: no devices found\n"); return 1; } + if (ds1wm_data->reset_recover_delay) + msleep(ds1wm_data->reset_recover_delay); + return 0; } static int ds1wm_write(struct ds1wm_data *ds1wm_data, u8 data) { + unsigned long timeleft; DECLARE_COMPLETION_ONSTACK(write_done); ds1wm_data->write_complete = &write_done; + ds1wm_write_register(ds1wm_data, DS1WM_INT_EN, + ds1wm_data->int_en_reg_none | DS1WM_INTEN_ETMT); + ds1wm_write_register(ds1wm_data, DS1WM_DATA, data); - wait_for_completion_timeout(&write_done, DS1WM_TIMEOUT); + timeleft = wait_for_completion_timeout(&write_done, DS1WM_TIMEOUT); + ds1wm_data->write_complete = NULL; + if (!timeleft) { + dev_err(&ds1wm_data->pdev->dev, "write failed, timed out\n"); + return -ETIMEDOUT; + } return 0; } -static int ds1wm_read(struct ds1wm_data *ds1wm_data, unsigned char write_data) +static u8 ds1wm_read(struct ds1wm_data *ds1wm_data, unsigned char write_data) { + unsigned long timeleft; + u8 intEnable = DS1WM_INTEN_ERBF | ds1wm_data->int_en_reg_none; DECLARE_COMPLETION_ONSTACK(read_done); + + ds1wm_read_register(ds1wm_data, DS1WM_DATA); + ds1wm_data->read_complete = &read_done; + ds1wm_write_register(ds1wm_data, DS1WM_INT_EN, intEnable); - ds1wm_write(ds1wm_data, write_data); - wait_for_completion_timeout(&read_done, DS1WM_TIMEOUT); - ds1wm_data->read_complete = NULL; + ds1wm_write_register(ds1wm_data, DS1WM_DATA, write_data); + timeleft = wait_for_completion_timeout(&read_done, DS1WM_TIMEOUT); + ds1wm_data->read_complete = NULL; + if (!timeleft) { + dev_err(&ds1wm_data->pdev->dev, "read failed, timed out\n"); + ds1wm_data->read_error = -ETIMEDOUT; + return 0xFF; + } + ds1wm_data->read_error = 0; return ds1wm_data->read_byte; } @@ -204,8 +245,8 @@ static int ds1wm_find_divisor(int gclk) { int i; - for (i = 0; i < ARRAY_SIZE(freq); i++) - if (gclk <= freq[i].freq) + for (i = ARRAY_SIZE(freq)-1; i >= 0; --i) + if (gclk >= freq[i].freq) return freq[i].divisor; return 0; @@ -213,17 +254,19 @@ static int ds1wm_find_divisor(int gclk) static void ds1wm_up(struct ds1wm_data *ds1wm_data) { - int gclk, divisor; + int divisor; + struct device *dev = &ds1wm_data->pdev->dev; + struct ds1wm_driver_data *plat = dev_get_platdata(dev); - if (ds1wm_data->pdata->enable) - ds1wm_data->pdata->enable(ds1wm_data->pdev); + if (ds1wm_data->cell->enable) + ds1wm_data->cell->enable(ds1wm_data->pdev); - gclk = clk_get_rate(ds1wm_data->clk); - clk_enable(ds1wm_data->clk); - divisor = ds1wm_find_divisor(gclk); + divisor = ds1wm_find_divisor(plat->clock_rate); + dev_dbg(dev, "found divisor 0x%x for clock %d\n", + divisor, plat->clock_rate); if (divisor == 0) { - dev_err(&ds1wm_data->pdev->dev, - "no suitable divisor for %dHz clock\n", gclk); + dev_err(dev, "no suitable divisor for %dHz clock\n", + plat->clock_rate); return; } ds1wm_write_register(ds1wm_data, DS1WM_CLKDIV, divisor); @@ -240,12 +283,10 @@ static void ds1wm_down(struct ds1wm_data *ds1wm_data) /* Disable interrupts. */ ds1wm_write_register(ds1wm_data, DS1WM_INT_EN, - ds1wm_data->active_high ? DS1WM_INTEN_IAS : 0); + ds1wm_data->int_en_reg_none); - if (ds1wm_data->pdata->disable) - ds1wm_data->pdata->disable(ds1wm_data->pdev); - - clk_disable(ds1wm_data->clk); + if (ds1wm_data->cell->disable) + ds1wm_data->cell->disable(ds1wm_data->pdev); } /* --------------------------------------------------------------------- */ @@ -274,46 +315,130 @@ static u8 ds1wm_reset_bus(void *data) return 0; } -static void ds1wm_search(void *data, u8 search_type, - w1_slave_found_callback slave_found) +static void ds1wm_search(void *data, struct w1_master *master_dev, + u8 search_type, w1_slave_found_callback slave_found) { struct ds1wm_data *ds1wm_data = data; int i; - unsigned long long rom_id; - - /* XXX We need to iterate for multiple devices per the DS1WM docs. - * See http://www.maxim-ic.com/appnotes.cfm/appnote_number/120. */ - if (ds1wm_reset(ds1wm_data)) - return; - - ds1wm_write(ds1wm_data, search_type); - ds1wm_write_register(ds1wm_data, DS1WM_CMD, DS1WM_CMD_SRA); - - for (rom_id = 0, i = 0; i < 16; i++) { - - unsigned char resp, r, d; - - resp = ds1wm_read(ds1wm_data, 0x00); - - r = ((resp & 0x02) >> 1) | - ((resp & 0x08) >> 2) | - ((resp & 0x20) >> 3) | - ((resp & 0x80) >> 4); - - d = ((resp & 0x01) >> 0) | - ((resp & 0x04) >> 1) | - ((resp & 0x10) >> 2) | - ((resp & 0x40) >> 3); - - rom_id |= (unsigned long long) r << (i * 4); - - } - dev_dbg(&ds1wm_data->pdev->dev, "found 0x%08llX\n", rom_id); - - ds1wm_write_register(ds1wm_data, DS1WM_CMD, ~DS1WM_CMD_SRA); - ds1wm_reset(ds1wm_data); - - slave_found(ds1wm_data, rom_id); + int ms_discrep_bit = -1; + u64 r = 0; /* holds the progress of the search */ + u64 r_prime, d; + unsigned slaves_found = 0; + unsigned int pass = 0; + + dev_dbg(&ds1wm_data->pdev->dev, "search begin\n"); + while (true) { + ++pass; + if (pass > 100) { + dev_dbg(&ds1wm_data->pdev->dev, + "too many attempts (100), search aborted\n"); + return; + } + + mutex_lock(&master_dev->bus_mutex); + if (ds1wm_reset(ds1wm_data)) { + mutex_unlock(&master_dev->bus_mutex); + dev_dbg(&ds1wm_data->pdev->dev, + "pass: %d reset error (or no slaves)\n", pass); + break; + } + + dev_dbg(&ds1wm_data->pdev->dev, + "pass: %d r : %0#18llx writing SEARCH_ROM\n", pass, r); + ds1wm_write(ds1wm_data, search_type); + dev_dbg(&ds1wm_data->pdev->dev, + "pass: %d entering ASM\n", pass); + ds1wm_write_register(ds1wm_data, DS1WM_CMD, DS1WM_CMD_SRA); + dev_dbg(&ds1wm_data->pdev->dev, + "pass: %d beginning nibble loop\n", pass); + + r_prime = 0; + d = 0; + /* we work one nibble at a time */ + /* each nibble is interleaved to form a byte */ + for (i = 0; i < 16; i++) { + + unsigned char resp, _r, _r_prime, _d; + + _r = (r >> (4*i)) & 0xf; + _r = ((_r & 0x1) << 1) | + ((_r & 0x2) << 2) | + ((_r & 0x4) << 3) | + ((_r & 0x8) << 4); + + /* writes _r, then reads back: */ + resp = ds1wm_read(ds1wm_data, _r); + + if (ds1wm_data->read_error) { + dev_err(&ds1wm_data->pdev->dev, + "pass: %d nibble: %d read error\n", pass, i); + break; + } + + _r_prime = ((resp & 0x02) >> 1) | + ((resp & 0x08) >> 2) | + ((resp & 0x20) >> 3) | + ((resp & 0x80) >> 4); + + _d = ((resp & 0x01) >> 0) | + ((resp & 0x04) >> 1) | + ((resp & 0x10) >> 2) | + ((resp & 0x40) >> 3); + + r_prime |= (unsigned long long) _r_prime << (i * 4); + d |= (unsigned long long) _d << (i * 4); + + } + if (ds1wm_data->read_error) { + mutex_unlock(&master_dev->bus_mutex); + dev_err(&ds1wm_data->pdev->dev, + "pass: %d read error, retrying\n", pass); + break; + } + dev_dbg(&ds1wm_data->pdev->dev, + "pass: %d r\': %0#18llx d:%0#18llx\n", + pass, r_prime, d); + dev_dbg(&ds1wm_data->pdev->dev, + "pass: %d nibble loop complete, exiting ASM\n", pass); + ds1wm_write_register(ds1wm_data, DS1WM_CMD, ~DS1WM_CMD_SRA); + dev_dbg(&ds1wm_data->pdev->dev, + "pass: %d resetting bus\n", pass); + ds1wm_reset(ds1wm_data); + mutex_unlock(&master_dev->bus_mutex); + if ((r_prime & ((u64)1 << 63)) && (d & ((u64)1 << 63))) { + dev_err(&ds1wm_data->pdev->dev, + "pass: %d bus error, retrying\n", pass); + continue; /* start over */ + } + + + dev_dbg(&ds1wm_data->pdev->dev, + "pass: %d found %0#18llx\n", pass, r_prime); + slave_found(master_dev, r_prime); + ++slaves_found; + dev_dbg(&ds1wm_data->pdev->dev, + "pass: %d complete, preparing next pass\n", pass); + + /* any discrepency found which we already choose the + '1' branch is now is now irrelevant we reveal the + next branch with this: */ + d &= ~r; + /* find last bit set, i.e. the most signif. bit set */ + ms_discrep_bit = fls64(d) - 1; + dev_dbg(&ds1wm_data->pdev->dev, + "pass: %d new d:%0#18llx MS discrep bit:%d\n", + pass, d, ms_discrep_bit); + + /* prev_ms_discrep_bit = ms_discrep_bit; + prepare for next ROM search: */ + if (ms_discrep_bit == -1) + break; + + r = (r & ~(~0ull << (ms_discrep_bit))) | 1 << ms_discrep_bit; + } /* end while true */ + dev_dbg(&ds1wm_data->pdev->dev, + "pass: %d total: %d search done ms d bit pos: %d\n", pass, + slaves_found, ms_discrep_bit); } /* --------------------------------------------------------------------- */ @@ -328,57 +453,54 @@ static struct w1_bus_master ds1wm_master = { static int ds1wm_probe(struct platform_device *pdev) { struct ds1wm_data *ds1wm_data; - struct ds1wm_platform_data *plat; + struct ds1wm_driver_data *plat; struct resource *res; int ret; if (!pdev) return -ENODEV; - ds1wm_data = kzalloc(sizeof(*ds1wm_data), GFP_KERNEL); + ds1wm_data = devm_kzalloc(&pdev->dev, sizeof(*ds1wm_data), GFP_KERNEL); if (!ds1wm_data) return -ENOMEM; platform_set_drvdata(pdev, ds1wm_data); res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - if (!res) { - ret = -ENXIO; - goto err0; - } - ds1wm_data->map = ioremap(res->start, res->end - res->start + 1); - if (!ds1wm_data->map) { - ret = -ENOMEM; - goto err0; - } - plat = pdev->dev.platform_data; - ds1wm_data->bus_shift = plat->bus_shift; + if (!res) + return -ENXIO; + ds1wm_data->map = devm_ioremap(&pdev->dev, res->start, + resource_size(res)); + if (!ds1wm_data->map) + return -ENOMEM; + + /* calculate bus shift from mem resource */ + ds1wm_data->bus_shift = resource_size(res) >> 3; + ds1wm_data->pdev = pdev; - ds1wm_data->pdata = plat; + ds1wm_data->cell = mfd_get_cell(pdev); + if (!ds1wm_data->cell) + return -ENODEV; + plat = dev_get_platdata(&pdev->dev); + if (!plat) + return -ENODEV; res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); - if (!res) { - ret = -ENXIO; - goto err1; - } + if (!res) + return -ENXIO; ds1wm_data->irq = res->start; - ds1wm_data->active_high = plat->active_high; + ds1wm_data->int_en_reg_none = (plat->active_high ? DS1WM_INTEN_IAS : 0); + ds1wm_data->reset_recover_delay = plat->reset_recover_delay; if (res->flags & IORESOURCE_IRQ_HIGHEDGE) - set_irq_type(ds1wm_data->irq, IRQ_TYPE_EDGE_RISING); + irq_set_irq_type(ds1wm_data->irq, IRQ_TYPE_EDGE_RISING); if (res->flags & IORESOURCE_IRQ_LOWEDGE) - set_irq_type(ds1wm_data->irq, IRQ_TYPE_EDGE_FALLING); + irq_set_irq_type(ds1wm_data->irq, IRQ_TYPE_EDGE_FALLING); - ret = request_irq(ds1wm_data->irq, ds1wm_isr, IRQF_DISABLED, - "ds1wm", ds1wm_data); + ret = devm_request_irq(&pdev->dev, ds1wm_data->irq, ds1wm_isr, + IRQF_SHARED, "ds1wm", ds1wm_data); if (ret) - goto err1; - - ds1wm_data->clk = clk_get(&pdev->dev, "ds1wm"); - if (IS_ERR(ds1wm_data->clk)) { - ret = PTR_ERR(ds1wm_data->clk); - goto err2; - } + return ret; ds1wm_up(ds1wm_data); @@ -386,19 +508,12 @@ static int ds1wm_probe(struct platform_device *pdev) ret = w1_add_master_device(&ds1wm_master); if (ret) - goto err3; + goto err; return 0; -err3: +err: ds1wm_down(ds1wm_data); - clk_put(ds1wm_data->clk); -err2: - free_irq(ds1wm_data->irq, ds1wm_data); -err1: - iounmap(ds1wm_data->map); -err0: - kfree(ds1wm_data); return ret; } @@ -432,10 +547,6 @@ static int ds1wm_remove(struct platform_device *pdev) w1_remove_master_device(&ds1wm_master); ds1wm_down(ds1wm_data); - clk_put(ds1wm_data->clk); - free_irq(ds1wm_data->irq, ds1wm_data); - iounmap(ds1wm_data->map); - kfree(ds1wm_data); return 0; } @@ -466,5 +577,6 @@ module_exit(ds1wm_exit); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Szabolcs Gyurko <szabolcs.gyurko@tlt.hu>, " - "Matt Reimer <mreimer@vpop.net>"); + "Matt Reimer <mreimer@vpop.net>," + "Jean-Francois Dagenais <dagenaisj@sonatest.com>"); MODULE_DESCRIPTION("DS1WM w1 busmaster driver"); diff --git a/drivers/w1/masters/ds2482.c b/drivers/w1/masters/ds2482.c index 0fd5820d5c6..e033491fe30 100644 --- a/drivers/w1/masters/ds2482.c +++ b/drivers/w1/masters/ds2482.c @@ -24,19 +24,6 @@ #include "../w1_int.h" /** - * Address is selected using 2 pins, resulting in 4 possible addresses. - * 0x18, 0x19, 0x1a, 0x1b - * However, the chip cannot be detected without doing an i2c write, - * so use the force module parameter. - */ -static const unsigned short normal_i2c[] = { I2C_CLIENT_END }; - -/** - * Insmod parameters - */ -I2C_CLIENT_INSMOD_1(ds2482); - -/** * The DS2482 registers - there are 3 registers that are addressed by a read * pointer. The read pointer is set by the last command executed. * @@ -64,10 +51,10 @@ I2C_CLIENT_INSMOD_1(ds2482); * The top 4 bits always read 0. * To write, the top nibble must be the 1's compl. of the low nibble. */ -#define DS2482_REG_CFG_1WS 0x08 -#define DS2482_REG_CFG_SPU 0x04 -#define DS2482_REG_CFG_PPM 0x02 -#define DS2482_REG_CFG_APU 0x01 +#define DS2482_REG_CFG_1WS 0x08 /* 1-wire speed */ +#define DS2482_REG_CFG_SPU 0x04 /* strong pull-up */ +#define DS2482_REG_CFG_PPM 0x02 /* presence pulse masking */ +#define DS2482_REG_CFG_APU 0x01 /* active pull-up */ /** @@ -94,21 +81,27 @@ static const u8 ds2482_chan_rd[8] = #define DS2482_REG_STS_1WB 0x01 -static int ds2482_attach_adapter(struct i2c_adapter *adapter); -static int ds2482_detect(struct i2c_adapter *adapter, int address, int kind); -static int ds2482_detach_client(struct i2c_client *client); +static int ds2482_probe(struct i2c_client *client, + const struct i2c_device_id *id); +static int ds2482_remove(struct i2c_client *client); /** * Driver data (common to all clients) */ +static const struct i2c_device_id ds2482_id[] = { + { "ds2482", 0 }, + { } +}; + static struct i2c_driver ds2482_driver = { .driver = { .owner = THIS_MODULE, .name = "ds2482", }, - .attach_adapter = ds2482_attach_adapter, - .detach_client = ds2482_detach_client, + .probe = ds2482_probe, + .remove = ds2482_remove, + .id_table = ds2482_id, }; /* @@ -124,7 +117,7 @@ struct ds2482_w1_chan { }; struct ds2482_data { - struct i2c_client client; + struct i2c_client *client; struct mutex access_lock; /* 1-wire interface(s) */ @@ -139,6 +132,17 @@ struct ds2482_data { /** + * Helper to calculate values for configuration register + * @param conf the raw config value + * @return the value w/ complements that can be written to register + */ +static inline u8 ds2482_calculate_config(u8 conf) +{ + return conf | ((~conf & 0x0f) << 4); +} + + +/** * Sets the read pointer. * @param pdev The ds2482 client pointer * @param read_ptr see DS2482_PTR_CODE_xxx above @@ -147,7 +151,7 @@ struct ds2482_data { static inline int ds2482_select_register(struct ds2482_data *pdev, u8 read_ptr) { if (pdev->read_prt != read_ptr) { - if (i2c_smbus_write_byte_data(&pdev->client, + if (i2c_smbus_write_byte_data(pdev->client, DS2482_CMD_SET_READ_PTR, read_ptr) < 0) return -1; @@ -167,7 +171,7 @@ static inline int ds2482_select_register(struct ds2482_data *pdev, u8 read_ptr) */ static inline int ds2482_send_cmd(struct ds2482_data *pdev, u8 cmd) { - if (i2c_smbus_write_byte(&pdev->client, cmd) < 0) + if (i2c_smbus_write_byte(pdev->client, cmd) < 0) return -1; pdev->read_prt = DS2482_PTR_CODE_STATUS; @@ -187,7 +191,7 @@ static inline int ds2482_send_cmd(struct ds2482_data *pdev, u8 cmd) static inline int ds2482_send_cmd_data(struct ds2482_data *pdev, u8 cmd, u8 byte) { - if (i2c_smbus_write_byte_data(&pdev->client, cmd, byte) < 0) + if (i2c_smbus_write_byte_data(pdev->client, cmd, byte) < 0) return -1; /* all cmds leave in STATUS, except CONFIG */ @@ -216,12 +220,12 @@ static int ds2482_wait_1wire_idle(struct ds2482_data *pdev) if (!ds2482_select_register(pdev, DS2482_PTR_CODE_STATUS)) { do { - temp = i2c_smbus_read_byte(&pdev->client); + temp = i2c_smbus_read_byte(pdev->client); } while ((temp >= 0) && (temp & DS2482_REG_STS_1WB) && (++retries < DS2482_WAIT_IDLE_TIMEOUT)); } - if (retries > DS2482_WAIT_IDLE_TIMEOUT) + if (retries >= DS2482_WAIT_IDLE_TIMEOUT) printk(KERN_ERR "%s: timeout on channel %d\n", __func__, pdev->channel); @@ -238,13 +242,13 @@ static int ds2482_wait_1wire_idle(struct ds2482_data *pdev) */ static int ds2482_set_channel(struct ds2482_data *pdev, u8 channel) { - if (i2c_smbus_write_byte_data(&pdev->client, DS2482_CMD_CHANNEL_SELECT, + if (i2c_smbus_write_byte_data(pdev->client, DS2482_CMD_CHANNEL_SELECT, ds2482_chan_wr[channel]) < 0) return -1; pdev->read_prt = DS2482_PTR_CODE_CHANNEL; pdev->channel = -1; - if (i2c_smbus_read_byte(&pdev->client) == ds2482_chan_rd[channel]) { + if (i2c_smbus_read_byte(pdev->client) == ds2482_chan_rd[channel]) { pdev->channel = channel; return 0; } @@ -368,7 +372,7 @@ static u8 ds2482_w1_read_byte(void *data) ds2482_select_register(pdev, DS2482_PTR_CODE_DATA); /* Read the data byte */ - result = i2c_smbus_read_byte(&pdev->client); + result = i2c_smbus_read_byte(pdev->client); mutex_unlock(&pdev->access_lock); @@ -406,7 +410,7 @@ static u8 ds2482_w1_reset_bus(void *data) /* If the chip did reset since detect, re-config it */ if (err & DS2482_REG_STS_RST) ds2482_send_cmd_data(pdev, DS2482_CMD_WRITE_CONFIG, - 0xF0); + ds2482_calculate_config(0x00)); } mutex_unlock(&pdev->access_lock); @@ -414,48 +418,57 @@ static u8 ds2482_w1_reset_bus(void *data) return retval; } - -/** - * Called to see if the device exists on an i2c bus. - */ -static int ds2482_attach_adapter(struct i2c_adapter *adapter) +static u8 ds2482_w1_set_pullup(void *data, int delay) { - return i2c_probe(adapter, &addr_data, ds2482_detect); + struct ds2482_w1_chan *pchan = data; + struct ds2482_data *pdev = pchan->pdev; + u8 retval = 1; + + /* if delay is non-zero activate the pullup, + * the strong pullup will be automatically deactivated + * by the master, so do not explicitly deactive it + */ + if (delay) { + /* both waits are crucial, otherwise devices might not be + * powered long enough, causing e.g. a w1_therm sensor to + * provide wrong conversion results + */ + ds2482_wait_1wire_idle(pdev); + /* note: it seems like both SPU and APU have to be set! */ + retval = ds2482_send_cmd_data(pdev, DS2482_CMD_WRITE_CONFIG, + ds2482_calculate_config(DS2482_REG_CFG_SPU | + DS2482_REG_CFG_APU)); + ds2482_wait_1wire_idle(pdev); + } + + return retval; } -/* - * The following function does more than just detection. If detection - * succeeds, it also registers the new chip. - */ -static int ds2482_detect(struct i2c_adapter *adapter, int address, int kind) +static int ds2482_probe(struct i2c_client *client, + const struct i2c_device_id *id) { struct ds2482_data *data; - struct i2c_client *new_client; - int err = 0; + int err = -ENODEV; int temp1; int idx; - if (!i2c_check_functionality(adapter, + if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WRITE_BYTE_DATA | I2C_FUNC_SMBUS_BYTE)) - goto exit; + return -ENODEV; if (!(data = kzalloc(sizeof(struct ds2482_data), GFP_KERNEL))) { err = -ENOMEM; goto exit; } - new_client = &data->client; - i2c_set_clientdata(new_client, data); - new_client->addr = address; - new_client->driver = &ds2482_driver; - new_client->adapter = adapter; + data->client = client; + i2c_set_clientdata(client, data); /* Reset the device (sets the read_ptr to status) */ if (ds2482_send_cmd(data, DS2482_CMD_RESET) < 0) { - dev_dbg(&adapter->dev, "DS2482 reset failed at 0x%02x.\n", - address); + dev_warn(&client->dev, "DS2482 reset failed.\n"); goto exit_free; } @@ -463,10 +476,10 @@ static int ds2482_detect(struct i2c_adapter *adapter, int address, int kind) ndelay(525); /* Read the status byte - only reset bit and line should be set */ - temp1 = i2c_smbus_read_byte(new_client); + temp1 = i2c_smbus_read_byte(client); if (temp1 != (DS2482_REG_STS_LL | DS2482_REG_STS_RST)) { - dev_dbg(&adapter->dev, "DS2482 (0x%02x) reset status " - "0x%02X - not a DS2482\n", address, temp1); + dev_warn(&client->dev, "DS2482 reset status " + "0x%02X - not a DS2482\n", temp1); goto exit_free; } @@ -476,18 +489,11 @@ static int ds2482_detect(struct i2c_adapter *adapter, int address, int kind) data->w1_count = 8; /* Set all config items to 0 (off) */ - ds2482_send_cmd_data(data, DS2482_CMD_WRITE_CONFIG, 0xF0); - - /* We can fill in the remaining client fields */ - snprintf(new_client->name, sizeof(new_client->name), "ds2482-%d00", - data->w1_count); + ds2482_send_cmd_data(data, DS2482_CMD_WRITE_CONFIG, + ds2482_calculate_config(0x00)); mutex_init(&data->access_lock); - /* Tell the I2C layer a new client has arrived */ - if ((err = i2c_attach_client(new_client))) - goto exit_free; - /* Register 1-wire interface(s) */ for (idx = 0; idx < data->w1_count; idx++) { data->w1_ch[idx].pdev = data; @@ -500,6 +506,7 @@ static int ds2482_detect(struct i2c_adapter *adapter, int address, int kind) data->w1_ch[idx].w1_bm.touch_bit = ds2482_w1_touch_bit; data->w1_ch[idx].w1_bm.triplet = ds2482_w1_triplet; data->w1_ch[idx].w1_bm.reset_bus = ds2482_w1_reset_bus; + data->w1_ch[idx].w1_bm.set_pullup = ds2482_w1_set_pullup; err = w1_add_master_device(&data->w1_ch[idx].w1_bm); if (err) { @@ -511,8 +518,6 @@ static int ds2482_detect(struct i2c_adapter *adapter, int address, int kind) return 0; exit_w1_remove: - i2c_detach_client(new_client); - for (idx = 0; idx < data->w1_count; idx++) { if (data->w1_ch[idx].pdev != NULL) w1_remove_master_device(&data->w1_ch[idx].w1_bm); @@ -523,10 +528,10 @@ exit: return err; } -static int ds2482_detach_client(struct i2c_client *client) +static int ds2482_remove(struct i2c_client *client) { struct ds2482_data *data = i2c_get_clientdata(client); - int err, idx; + int idx; /* Unregister the 1-wire bridge(s) */ for (idx = 0; idx < data->w1_count; idx++) { @@ -534,31 +539,13 @@ static int ds2482_detach_client(struct i2c_client *client) w1_remove_master_device(&data->w1_ch[idx].w1_bm); } - /* Detach the i2c device */ - if ((err = i2c_detach_client(client))) { - dev_err(&client->dev, - "Deregistration failed, client not detached.\n"); - return err; - } - /* Free the memory */ kfree(data); return 0; } -static int __init sensors_ds2482_init(void) -{ - return i2c_add_driver(&ds2482_driver); -} - -static void __exit sensors_ds2482_exit(void) -{ - i2c_del_driver(&ds2482_driver); -} +module_i2c_driver(ds2482_driver); MODULE_AUTHOR("Ben Gardner <bgardner@wabtec.com>"); MODULE_DESCRIPTION("DS2482 driver"); MODULE_LICENSE("GPL"); - -module_init(sensors_ds2482_init); -module_exit(sensors_ds2482_exit); diff --git a/drivers/w1/masters/ds2490.c b/drivers/w1/masters/ds2490.c index b63b5e044a4..7404ad3062b 100644 --- a/drivers/w1/masters/ds2490.c +++ b/drivers/w1/masters/ds2490.c @@ -1,7 +1,7 @@ /* - * dscore.c + * ds2490.c USB to one wire bridge * - * Copyright (c) 2004 Evgeniy Polyakov <johnpol@2ka.mipt.ru> + * Copyright (c) 2004 Evgeniy Polyakov <zbr@ioremap.net> * * * This program is free software; you can redistribute it and/or modify @@ -23,10 +23,15 @@ #include <linux/kernel.h> #include <linux/mod_devicetable.h> #include <linux/usb.h> +#include <linux/slab.h> #include "../w1_int.h" #include "../w1.h" +/* USB Standard */ +/* USB Control request vendor type */ +#define VENDOR 0x40 + /* COMMAND TYPE CODES */ #define CONTROL_CMD 0x00 #define COMM_CMD 0x01 @@ -88,7 +93,7 @@ #define COMM_DT 0x2000 #define COMM_SPU 0x1000 #define COMM_F 0x0800 -#define COMM_NTP 0x0400 +#define COMM_NTF 0x0400 #define COMM_ICP 0x0200 #define COMM_RST 0x0100 @@ -98,11 +103,6 @@ #define BRANCH_MAIN 0xCC #define BRANCH_AUX 0x33 -/* - * Duration of the strong pull-up pulse in milliseconds. - */ -#define PULLUP_PULSE_DURATION 750 - /* Status flags */ #define ST_SPUA 0x01 /* Strong Pull-up is active */ #define ST_PRGA 0x02 /* 12V programming pulse is being generated */ @@ -111,6 +111,19 @@ #define ST_HALT 0x10 /* DS2490 is currently halted */ #define ST_IDLE 0x20 /* DS2490 is currently idle */ #define ST_EPOF 0x80 +/* Status transfer size, 16 bytes status, 16 byte result flags */ +#define ST_SIZE 0x20 + +/* Result Register flags */ +#define RR_DETECT 0xA5 /* New device detected */ +#define RR_NRS 0x01 /* Reset no presence or ... */ +#define RR_SH 0x02 /* short on reset or set path */ +#define RR_APP 0x04 /* alarming presence on reset */ +#define RR_VPP 0x08 /* 12V expected not seen */ +#define RR_CMP 0x10 /* compare error */ +#define RR_CRC 0x20 /* CRC error detected */ +#define RR_RDP 0x40 /* redirected page */ +#define RR_EOS 0x80 /* end of search error */ #define SPEED_NORMAL 0x00 #define SPEED_FLEXIBLE 0x01 @@ -131,6 +144,15 @@ struct ds_device int ep[NUM_EP]; + /* Strong PullUp + * 0: pullup not active, else duration in milliseconds + */ + int spu_sleep; + /* spu_bit contains COMM_SPU or 0 depending on if the strong pullup + * should be active or not for writes. + */ + u16 spu_bit; + struct w1_bus_master master; }; @@ -164,7 +186,6 @@ MODULE_DEVICE_TABLE(usb, ds_id_table); static int ds_probe(struct usb_interface *, const struct usb_device_id *); static void ds_disconnect(struct usb_interface *); -static inline void ds_dump_status(unsigned char *, unsigned char *, int); static int ds_send_control(struct ds_device *, u16, u16); static int ds_send_control_cmd(struct ds_device *, u16, u16); @@ -183,7 +204,7 @@ static int ds_send_control_cmd(struct ds_device *dev, u16 value, u16 index) int err; err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, dev->ep[EP_CONTROL]), - CONTROL_CMD, 0x40, value, index, NULL, 0, 1000); + CONTROL_CMD, VENDOR, value, index, NULL, 0, 1000); if (err < 0) { printk(KERN_ERR "Failed to send command control message %x.%x: err=%d.\n", value, index, err); @@ -192,13 +213,13 @@ static int ds_send_control_cmd(struct ds_device *dev, u16 value, u16 index) return err; } -#if 0 + static int ds_send_control_mode(struct ds_device *dev, u16 value, u16 index) { int err; err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, dev->ep[EP_CONTROL]), - MODE_CMD, 0x40, value, index, NULL, 0, 1000); + MODE_CMD, VENDOR, value, index, NULL, 0, 1000); if (err < 0) { printk(KERN_ERR "Failed to send mode control message %x.%x: err=%d.\n", value, index, err); @@ -207,13 +228,13 @@ static int ds_send_control_mode(struct ds_device *dev, u16 value, u16 index) return err; } -#endif + static int ds_send_control(struct ds_device *dev, u16 value, u16 index) { int err; err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, dev->ep[EP_CONTROL]), - COMM_CMD, 0x40, value, index, NULL, 0, 1000); + COMM_CMD, VENDOR, value, index, NULL, 0, 1000); if (err < 0) { printk(KERN_ERR "Failed to send control message %x.%x: err=%d.\n", value, index, err); @@ -223,11 +244,6 @@ static int ds_send_control(struct ds_device *dev, u16 value, u16 index) return err; } -static inline void ds_dump_status(unsigned char *buf, unsigned char *str, int off) -{ - printk("%45s: %8x\n", str, buf[off]); -} - static int ds_recv_status_nodump(struct ds_device *dev, struct ds_status *st, unsigned char *buf, int size) { @@ -236,7 +252,8 @@ static int ds_recv_status_nodump(struct ds_device *dev, struct ds_status *st, memset(st, 0, sizeof(*st)); count = 0; - err = usb_bulk_msg(dev->udev, usb_rcvbulkpipe(dev->udev, dev->ep[EP_STATUS]), buf, size, &count, 100); + err = usb_interrupt_msg(dev->udev, usb_rcvintpipe(dev->udev, + dev->ep[EP_STATUS]), buf, size, &count, 100); if (err < 0) { printk(KERN_ERR "Failed to read 1-wire data from 0x%x: err=%d.\n", dev->ep[EP_STATUS], err); return err; @@ -248,62 +265,81 @@ static int ds_recv_status_nodump(struct ds_device *dev, struct ds_status *st, return count; } -static int ds_recv_status(struct ds_device *dev, struct ds_status *st) +static inline void ds_print_msg(unsigned char *buf, unsigned char *str, int off) { - unsigned char buf[64]; - int count, err = 0, i; - - memcpy(st, buf, sizeof(*st)); + printk(KERN_INFO "%45s: %8x\n", str, buf[off]); +} - count = ds_recv_status_nodump(dev, st, buf, sizeof(buf)); - if (count < 0) - return err; +static void ds_dump_status(struct ds_device *dev, unsigned char *buf, int count) +{ + int i; - printk("0x%x: count=%d, status: ", dev->ep[EP_STATUS], count); + printk(KERN_INFO "0x%x: count=%d, status: ", dev->ep[EP_STATUS], count); for (i=0; i<count; ++i) printk("%02x ", buf[i]); - printk("\n"); + printk(KERN_INFO "\n"); if (count >= 16) { - ds_dump_status(buf, "enable flag", 0); - ds_dump_status(buf, "1-wire speed", 1); - ds_dump_status(buf, "strong pullup duration", 2); - ds_dump_status(buf, "programming pulse duration", 3); - ds_dump_status(buf, "pulldown slew rate control", 4); - ds_dump_status(buf, "write-1 low time", 5); - ds_dump_status(buf, "data sample offset/write-0 recovery time", 6); - ds_dump_status(buf, "reserved (test register)", 7); - ds_dump_status(buf, "device status flags", 8); - ds_dump_status(buf, "communication command byte 1", 9); - ds_dump_status(buf, "communication command byte 2", 10); - ds_dump_status(buf, "communication command buffer status", 11); - ds_dump_status(buf, "1-wire data output buffer status", 12); - ds_dump_status(buf, "1-wire data input buffer status", 13); - ds_dump_status(buf, "reserved", 14); - ds_dump_status(buf, "reserved", 15); + ds_print_msg(buf, "enable flag", 0); + ds_print_msg(buf, "1-wire speed", 1); + ds_print_msg(buf, "strong pullup duration", 2); + ds_print_msg(buf, "programming pulse duration", 3); + ds_print_msg(buf, "pulldown slew rate control", 4); + ds_print_msg(buf, "write-1 low time", 5); + ds_print_msg(buf, "data sample offset/write-0 recovery time", + 6); + ds_print_msg(buf, "reserved (test register)", 7); + ds_print_msg(buf, "device status flags", 8); + ds_print_msg(buf, "communication command byte 1", 9); + ds_print_msg(buf, "communication command byte 2", 10); + ds_print_msg(buf, "communication command buffer status", 11); + ds_print_msg(buf, "1-wire data output buffer status", 12); + ds_print_msg(buf, "1-wire data input buffer status", 13); + ds_print_msg(buf, "reserved", 14); + ds_print_msg(buf, "reserved", 15); } - - memcpy(st, buf, sizeof(*st)); - - if (st->status & ST_EPOF) { - printk(KERN_INFO "Resetting device after ST_EPOF.\n"); - err = ds_send_control_cmd(dev, CTL_RESET_DEVICE, 0); - if (err) - return err; - count = ds_recv_status_nodump(dev, st, buf, sizeof(buf)); - if (count < 0) - return err; - } -#if 0 - if (st->status & ST_IDLE) { - printk(KERN_INFO "Resetting pulse after ST_IDLE.\n"); - err = ds_start_pulse(dev, PULLUP_PULSE_DURATION); - if (err) - return err; + for (i = 16; i < count; ++i) { + if (buf[i] == RR_DETECT) { + ds_print_msg(buf, "new device detect", i); + continue; + } + ds_print_msg(buf, "Result Register Value: ", i); + if (buf[i] & RR_NRS) + printk(KERN_INFO "NRS: Reset no presence or ...\n"); + if (buf[i] & RR_SH) + printk(KERN_INFO "SH: short on reset or set path\n"); + if (buf[i] & RR_APP) + printk(KERN_INFO "APP: alarming presence on reset\n"); + if (buf[i] & RR_VPP) + printk(KERN_INFO "VPP: 12V expected not seen\n"); + if (buf[i] & RR_CMP) + printk(KERN_INFO "CMP: compare error\n"); + if (buf[i] & RR_CRC) + printk(KERN_INFO "CRC: CRC error detected\n"); + if (buf[i] & RR_RDP) + printk(KERN_INFO "RDP: redirected page\n"); + if (buf[i] & RR_EOS) + printk(KERN_INFO "EOS: end of search error\n"); } -#endif +} - return err; +static void ds_reset_device(struct ds_device *dev) +{ + ds_send_control_cmd(dev, CTL_RESET_DEVICE, 0); + /* Always allow strong pullup which allow individual writes to use + * the strong pullup. + */ + if (ds_send_control_mode(dev, MOD_PULSE_EN, PULSE_SPUE)) + printk(KERN_ERR "ds_reset_device: " + "Error allowing strong pullup\n"); + /* Chip strong pullup time was cleared. */ + if (dev->spu_sleep) { + /* lower 4 bits are 0, see ds_set_pullup */ + u8 del = dev->spu_sleep>>4; + if (ds_send_control(dev, COMM_SET_DURATION | COMM_IM, del)) + printk(KERN_ERR "ds_reset_device: " + "Error setting duration\n"); + } } static int ds_recv_data(struct ds_device *dev, unsigned char *buf, int size) @@ -311,13 +347,27 @@ static int ds_recv_data(struct ds_device *dev, unsigned char *buf, int size) int count, err; struct ds_status st; + /* Careful on size. If size is less than what is available in + * the input buffer, the device fails the bulk transfer and + * clears the input buffer. It could read the maximum size of + * the data buffer, but then do you return the first, last, or + * some set of the middle size bytes? As long as the rest of + * the code is correct there will be size bytes waiting. A + * call to ds_wait_status will wait until the device is idle + * and any data to be received would have been available. + */ count = 0; err = usb_bulk_msg(dev->udev, usb_rcvbulkpipe(dev->udev, dev->ep[EP_DATA_IN]), buf, size, &count, 1000); if (err < 0) { + u8 buf[ST_SIZE]; + int count; + printk(KERN_INFO "Clearing ep0x%x.\n", dev->ep[EP_DATA_IN]); usb_clear_halt(dev->udev, usb_rcvbulkpipe(dev->udev, dev->ep[EP_DATA_IN])); - ds_recv_status(dev, &st); + + count = ds_recv_status_nodump(dev, &st, buf, sizeof(buf)); + ds_dump_status(dev, buf, count); return err; } @@ -341,7 +391,8 @@ static int ds_send_data(struct ds_device *dev, unsigned char *buf, int len) count = 0; err = usb_bulk_msg(dev->udev, usb_sndbulkpipe(dev->udev, dev->ep[EP_DATA_OUT]), buf, len, &count, 1000); if (err < 0) { - printk(KERN_ERR "Failed to read 1-wire data from 0x02: err=%d.\n", err); + printk(KERN_ERR "Failed to write 1-wire data to ep0x%x: " + "err=%d.\n", dev->ep[EP_DATA_OUT], err); return err; } @@ -354,7 +405,7 @@ int ds_stop_pulse(struct ds_device *dev, int limit) { struct ds_status st; int count = 0, err = 0; - u8 buf[0x20]; + u8 buf[ST_SIZE]; do { err = ds_send_control(dev, CTL_HALT_EXE_IDLE, 0); @@ -397,7 +448,7 @@ int ds_detect(struct ds_device *dev, struct ds_status *st) if (err) return err; - err = ds_recv_status(dev, st); + err = ds_dump_status(dev, st); return err; } @@ -406,10 +457,11 @@ int ds_detect(struct ds_device *dev, struct ds_status *st) static int ds_wait_status(struct ds_device *dev, struct ds_status *st) { - u8 buf[0x20]; + u8 buf[ST_SIZE]; int err, count = 0; do { + st->status = 0; err = ds_recv_status_nodump(dev, st, buf, sizeof(buf)); #if 0 if (err >= 0) { @@ -420,33 +472,49 @@ static int ds_wait_status(struct ds_device *dev, struct ds_status *st) printk("\n"); } #endif - } while(!(buf[0x08] & 0x20) && !(err < 0) && ++count < 100); + } while (!(st->status & ST_IDLE) && !(err < 0) && ++count < 100); + if (err >= 16 && st->status & ST_EPOF) { + printk(KERN_INFO "Resetting device after ST_EPOF.\n"); + ds_reset_device(dev); + /* Always dump the device status. */ + count = 101; + } + + /* Dump the status for errors or if there is extended return data. + * The extended status includes new device detection (maybe someone + * can do something with it). + */ + if (err > 16 || count >= 100 || err < 0) + ds_dump_status(dev, buf, err); - if (((err > 16) && (buf[0x10] & 0x01)) || count >= 100 || err < 0) { - ds_recv_status(dev, st); + /* Extended data isn't an error. Well, a short is, but the dump + * would have already told the user that and we can't do anything + * about it in software anyway. + */ + if (count >= 100 || err < 0) return -1; - } else + else return 0; } -static int ds_reset(struct ds_device *dev, struct ds_status *st) +static int ds_reset(struct ds_device *dev) { int err; - //err = ds_send_control(dev, COMM_1_WIRE_RESET | COMM_F | COMM_IM | COMM_SE, SPEED_FLEXIBLE); - err = ds_send_control(dev, 0x43, SPEED_NORMAL); + /* Other potentionally interesting flags for reset. + * + * COMM_NTF: Return result register feedback. This could be used to + * detect some conditions such as short, alarming presence, or + * detect if a new device was detected. + * + * COMM_SE which allows SPEED_NORMAL, SPEED_FLEXIBLE, SPEED_OVERDRIVE: + * Select the data transfer rate. + */ + err = ds_send_control(dev, COMM_1_WIRE_RESET | COMM_IM, SPEED_NORMAL); if (err) return err; - ds_wait_status(dev, st); -#if 0 - if (st->command_buffer_status) { - printk(KERN_INFO "Short circuit.\n"); - return -EIO; - } -#endif - return 0; } @@ -471,60 +539,43 @@ static int ds_set_speed(struct ds_device *dev, int speed) } #endif /* 0 */ -static int ds_start_pulse(struct ds_device *dev, int delay) +static int ds_set_pullup(struct ds_device *dev, int delay) { - int err; + int err = 0; u8 del = 1 + (u8)(delay >> 4); - struct ds_status st; - -#if 0 - err = ds_stop_pulse(dev, 10); - if (err) + /* Just storing delay would not get the trunication and roundup. */ + int ms = del<<4; + + /* Enable spu_bit if a delay is set. */ + dev->spu_bit = delay ? COMM_SPU : 0; + /* If delay is zero, it has already been disabled, if the time is + * the same as the hardware was last programmed to, there is also + * nothing more to do. Compare with the recalculated value ms + * rather than del or delay which can have a different value. + */ + if (delay == 0 || ms == dev->spu_sleep) return err; - err = ds_send_control_mode(dev, MOD_PULSE_EN, PULSE_SPUE); - if (err) - return err; -#endif err = ds_send_control(dev, COMM_SET_DURATION | COMM_IM, del); if (err) return err; - err = ds_send_control(dev, COMM_PULSE | COMM_IM | COMM_F, 0); - if (err) - return err; - - mdelay(delay); - - ds_wait_status(dev, &st); + dev->spu_sleep = ms; return err; } static int ds_touch_bit(struct ds_device *dev, u8 bit, u8 *tbit) { - int err, count; + int err; struct ds_status st; - u16 value = (COMM_BIT_IO | COMM_IM) | ((bit) ? COMM_D : 0); - u16 cmd; - err = ds_send_control(dev, value, 0); + err = ds_send_control(dev, COMM_BIT_IO | COMM_IM | (bit ? COMM_D : 0), + 0); if (err) return err; - count = 0; - do { - err = ds_wait_status(dev, &st); - if (err) - return err; - - cmd = st.command0 | (st.command1 << 8); - } while (cmd != value && ++count < 10); - - if (err < 0 || count >= 10) { - printk(KERN_ERR "Failed to obtain status.\n"); - return -EINVAL; - } + ds_wait_status(dev, &st); err = ds_recv_data(dev, tbit, sizeof(*tbit)); if (err < 0) @@ -533,12 +584,18 @@ static int ds_touch_bit(struct ds_device *dev, u8 bit, u8 *tbit) return 0; } +#if 0 static int ds_write_bit(struct ds_device *dev, u8 bit) { int err; struct ds_status st; - err = ds_send_control(dev, COMM_BIT_IO | COMM_IM | (bit) ? COMM_D : 0, 0); + /* Set COMM_ICP to write without a readback. Note, this will + * produce one time slot, a down followed by an up with COMM_D + * only determing the timing. + */ + err = ds_send_control(dev, COMM_BIT_IO | COMM_IM | COMM_ICP | + (bit ? COMM_D : 0), 0); if (err) return err; @@ -546,6 +603,7 @@ static int ds_write_bit(struct ds_device *dev, u8 bit) return 0; } +#endif static int ds_write_byte(struct ds_device *dev, u8 byte) { @@ -553,10 +611,13 @@ static int ds_write_byte(struct ds_device *dev, u8 byte) struct ds_status st; u8 rbyte; - err = ds_send_control(dev, COMM_BYTE_IO | COMM_IM | COMM_SPU, byte); + err = ds_send_control(dev, COMM_BYTE_IO | COMM_IM | dev->spu_bit, byte); if (err) return err; + if (dev->spu_bit) + msleep(dev->spu_sleep); + err = ds_wait_status(dev, &st); if (err) return err; @@ -565,8 +626,6 @@ static int ds_write_byte(struct ds_device *dev, u8 byte) if (err < 0) return err; - ds_start_pulse(dev, PULLUP_PULSE_DURATION); - return !(byte == rbyte); } @@ -602,7 +661,7 @@ static int ds_read_block(struct ds_device *dev, u8 *buf, int len) if (err < 0) return err; - err = ds_send_control(dev, COMM_BLOCK_IO | COMM_IM | COMM_SPU, len); + err = ds_send_control(dev, COMM_BLOCK_IO | COMM_IM, len); if (err) return err; @@ -623,54 +682,122 @@ static int ds_write_block(struct ds_device *dev, u8 *buf, int len) if (err < 0) return err; - ds_wait_status(dev, &st); - - err = ds_send_control(dev, COMM_BLOCK_IO | COMM_IM | COMM_SPU, len); + err = ds_send_control(dev, COMM_BLOCK_IO | COMM_IM | dev->spu_bit, len); if (err) return err; + if (dev->spu_bit) + msleep(dev->spu_sleep); + ds_wait_status(dev, &st); err = ds_recv_data(dev, buf, len); if (err < 0) return err; - ds_start_pulse(dev, PULLUP_PULSE_DURATION); - return !(err == len); } -#if 0 - -static int ds_search(struct ds_device *dev, u64 init, u64 *buf, u8 id_number, int conditional_search) +static void ds9490r_search(void *data, struct w1_master *master, + u8 search_type, w1_slave_found_callback callback) { + /* When starting with an existing id, the first id returned will + * be that device (if it is still on the bus most likely). + * + * If the number of devices found is less than or equal to the + * search_limit, that number of IDs will be returned. If there are + * more, search_limit IDs will be returned followed by a non-zero + * discrepency value. + */ + struct ds_device *dev = data; int err; u16 value, index; struct ds_status st; + u8 st_buf[ST_SIZE]; + int search_limit; + int found = 0; + int i; - memset(buf, 0, sizeof(buf)); + /* DS18b20 spec, 13.16 ms per device, 75 per second, sleep for + * discovering 8 devices (1 bulk transfer and 1/2 FIFO size) at a time. + */ + const unsigned long jtime = msecs_to_jiffies(1000*8/75); + /* FIFO 128 bytes, bulk packet size 64, read a multiple of the + * packet size. + */ + u64 buf[2*64/8]; - err = ds_send_data(ds_dev, (unsigned char *)&init, 8); - if (err) - return err; + mutex_lock(&master->bus_mutex); - ds_wait_status(ds_dev, &st); + /* address to start searching at */ + if (ds_send_data(dev, (u8 *)&master->search_id, 8) < 0) + goto search_out; + master->search_id = 0; - value = COMM_SEARCH_ACCESS | COMM_IM | COMM_SM | COMM_F | COMM_RTS; - index = (conditional_search ? 0xEC : 0xF0) | (id_number << 8); - err = ds_send_control(ds_dev, value, index); - if (err) - return err; + value = COMM_SEARCH_ACCESS | COMM_IM | COMM_RST | COMM_SM | COMM_F | + COMM_RTS; + search_limit = master->max_slave_count; + if (search_limit > 255) + search_limit = 0; + index = search_type | (search_limit << 8); + if (ds_send_control(dev, value, index) < 0) + goto search_out; - ds_wait_status(ds_dev, &st); + do { + schedule_timeout(jtime); - err = ds_recv_data(ds_dev, (unsigned char *)buf, 8*id_number); - if (err < 0) - return err; + if (ds_recv_status_nodump(dev, &st, st_buf, sizeof(st_buf)) < + sizeof(st)) { + break; + } - return err/8; + if (st.data_in_buffer_status) { + /* Bulk in can receive partial ids, but when it does + * they fail crc and will be discarded anyway. + * That has only been seen when status in buffer + * is 0 and bulk is read anyway, so don't read + * bulk without first checking if status says there + * is data to read. + */ + err = ds_recv_data(dev, (u8 *)buf, sizeof(buf)); + if (err < 0) + break; + for (i = 0; i < err/8; ++i) { + ++found; + if (found <= search_limit) + callback(master, buf[i]); + /* can't know if there will be a discrepancy + * value after until the next id */ + if (found == search_limit) + master->search_id = buf[i]; + } + } + + if (test_bit(W1_ABORT_SEARCH, &master->flags)) + break; + } while (!(st.status & (ST_IDLE | ST_HALT))); + + /* only continue the search if some weren't found */ + if (found <= search_limit) { + master->search_id = 0; + } else if (!test_bit(W1_WARN_MAX_COUNT, &master->flags)) { + /* Only max_slave_count will be scanned in a search, + * but it will start where it left off next search + * until all ids are identified and then it will start + * over. A continued search will report the previous + * last id as the first id (provided it is still on the + * bus). + */ + dev_info(&dev->udev->dev, "%s: max_slave_count %d reached, " + "will continue next search.\n", __func__, + master->max_slave_count); + set_bit(W1_WARN_MAX_COUNT, &master->flags); + } +search_out: + mutex_unlock(&master->bus_mutex); } +#if 0 static int ds_match_access(struct ds_device *dev, u64 init) { int err; @@ -728,6 +855,7 @@ static u8 ds9490r_touch_bit(void *data, u8 bit) return ret; } +#if 0 static void ds9490r_write_bit(void *data, u8 bit) { struct ds_device *dev = data; @@ -735,13 +863,6 @@ static void ds9490r_write_bit(void *data, u8 bit) ds_write_bit(dev, bit); } -static void ds9490r_write_byte(void *data, u8 byte) -{ - struct ds_device *dev = data; - - ds_write_byte(dev, byte); -} - static u8 ds9490r_read_bit(void *data) { struct ds_device *dev = data; @@ -754,6 +875,14 @@ static u8 ds9490r_read_bit(void *data) return bit & 1; } +#endif + +static void ds9490r_write_byte(void *data, u8 byte) +{ + struct ds_device *dev = data; + + ds_write_byte(dev, byte); +} static u8 ds9490r_read_byte(void *data) { @@ -790,31 +919,59 @@ static u8 ds9490r_read_block(void *data, u8 *buf, int len) static u8 ds9490r_reset(void *data) { struct ds_device *dev = data; - struct ds_status st; int err; - memset(&st, 0, sizeof(st)); - - err = ds_reset(dev, &st); + err = ds_reset(dev); if (err) return 1; return 0; } +static u8 ds9490r_set_pullup(void *data, int delay) +{ + struct ds_device *dev = data; + + if (ds_set_pullup(dev, delay)) + return 1; + + return 0; +} + static int ds_w1_init(struct ds_device *dev) { memset(&dev->master, 0, sizeof(struct w1_bus_master)); + /* Reset the device as it can be in a bad state. + * This is necessary because a block write will wait for data + * to be placed in the output buffer and block any later + * commands which will keep accumulating and the device will + * not be idle. Another case is removing the ds2490 module + * while a bus search is in progress, somehow a few commands + * get through, but the input transfers fail leaving data in + * the input buffer. This will cause the next read to fail + * see the note in ds_recv_data. + */ + ds_reset_device(dev); + dev->master.data = dev; dev->master.touch_bit = &ds9490r_touch_bit; + /* read_bit and write_bit in w1_bus_master are expected to set and + * sample the line level. For write_bit that means it is expected to + * set it to that value and leave it there. ds2490 only supports an + * individual time slot at the lowest level. The requirement from + * pulling the bus state down to reading the state is 15us, something + * that isn't realistic on the USB bus anyway. dev->master.read_bit = &ds9490r_read_bit; dev->master.write_bit = &ds9490r_write_bit; + */ dev->master.read_byte = &ds9490r_read_byte; dev->master.write_byte = &ds9490r_write_byte; dev->master.read_block = &ds9490r_read_block; dev->master.write_block = &ds9490r_write_block; dev->master.reset_bus = &ds9490r_reset; + dev->master.set_pullup = &ds9490r_set_pullup; + dev->master.search = &ds9490r_search; return w1_add_master_device(&dev->master); } @@ -831,9 +988,9 @@ static int ds_probe(struct usb_interface *intf, struct usb_endpoint_descriptor *endpoint; struct usb_host_interface *iface_desc; struct ds_device *dev; - int i, err; + int i, err, alt; - dev = kmalloc(sizeof(struct ds_device), GFP_KERNEL); + dev = kzalloc(sizeof(struct ds_device), GFP_KERNEL); if (!dev) { printk(KERN_INFO "Failed to allocate new DS9490R structure.\n"); return -ENOMEM; @@ -847,20 +1004,25 @@ static int ds_probe(struct usb_interface *intf, usb_set_intfdata(intf, dev); - err = usb_set_interface(dev->udev, intf->altsetting[0].desc.bInterfaceNumber, 3); + err = usb_reset_configuration(dev->udev); if (err) { - printk(KERN_ERR "Failed to set alternative setting 3 for %d interface: err=%d.\n", - intf->altsetting[0].desc.bInterfaceNumber, err); + dev_err(&dev->udev->dev, + "Failed to reset configuration: err=%d.\n", err); goto err_out_clear; } - err = usb_reset_configuration(dev->udev); + /* alternative 3, 1ms interrupt (greatly speeds search), 64 byte bulk */ + alt = 3; + err = usb_set_interface(dev->udev, + intf->altsetting[alt].desc.bInterfaceNumber, alt); if (err) { - printk(KERN_ERR "Failed to reset configuration: err=%d.\n", err); + dev_err(&dev->udev->dev, "Failed to set alternative setting %d " + "for %d interface: err=%d.\n", alt, + intf->altsetting[alt].desc.bInterfaceNumber, err); goto err_out_clear; } - iface_desc = &intf->altsetting[0]; + iface_desc = &intf->altsetting[alt]; if (iface_desc->desc.bNumEndpoints != NUM_EP-1) { printk(KERN_INFO "Num endpoints=%d. It is not DS9490R.\n", iface_desc->desc.bNumEndpoints); err = -EINVAL; @@ -921,27 +1083,8 @@ static void ds_disconnect(struct usb_interface *intf) kfree(dev); } -static int ds_init(void) -{ - int err; - - err = usb_register(&ds_driver); - if (err) { - printk(KERN_INFO "Failed to register DS9490R USB device: err=%d.\n", err); - return err; - } - - return 0; -} - -static void ds_fini(void) -{ - usb_deregister(&ds_driver); -} - -module_init(ds_init); -module_exit(ds_fini); +module_usb_driver(ds_driver); MODULE_LICENSE("GPL"); -MODULE_AUTHOR("Evgeniy Polyakov <johnpol@2ka.mipt.ru>"); +MODULE_AUTHOR("Evgeniy Polyakov <zbr@ioremap.net>"); MODULE_DESCRIPTION("DS2490 USB <-> W1 bus master driver (DS9490*)"); diff --git a/drivers/w1/masters/matrox_w1.c b/drivers/w1/masters/matrox_w1.c index 1550431ccb6..d8667b0212d 100644 --- a/drivers/w1/masters/matrox_w1.c +++ b/drivers/w1/masters/matrox_w1.c @@ -1,7 +1,7 @@ /* * matrox_w1.c * - * Copyright (c) 2004 Evgeniy Polyakov <johnpol@2ka.mipt.ru> + * Copyright (c) 2004 Evgeniy Polyakov <zbr@ioremap.net> * * * This program is free software; you can redistribute it and/or modify @@ -20,7 +20,7 @@ */ #include <asm/types.h> -#include <asm/atomic.h> +#include <linux/atomic.h> #include <asm/io.h> #include <linux/delay.h> @@ -39,7 +39,7 @@ #include "../w1_log.h" MODULE_LICENSE("GPL"); -MODULE_AUTHOR("Evgeniy Polyakov <johnpol@2ka.mipt.ru>"); +MODULE_AUTHOR("Evgeniy Polyakov <zbr@ioremap.net>"); MODULE_DESCRIPTION("Driver for transport(Dallas 1-wire prtocol) over VGA DDC(matrox gpio)."); static struct pci_device_id matrox_w1_tbl[] = { @@ -48,14 +48,14 @@ static struct pci_device_id matrox_w1_tbl[] = { }; MODULE_DEVICE_TABLE(pci, matrox_w1_tbl); -static int __devinit matrox_w1_probe(struct pci_dev *, const struct pci_device_id *); -static void __devexit matrox_w1_remove(struct pci_dev *); +static int matrox_w1_probe(struct pci_dev *, const struct pci_device_id *); +static void matrox_w1_remove(struct pci_dev *); static struct pci_driver matrox_w1_pci_driver = { .name = "matrox_w1", .id_table = matrox_w1_tbl, .probe = matrox_w1_probe, - .remove = __devexit_p(matrox_w1_remove), + .remove = matrox_w1_remove, }; /* @@ -152,7 +152,7 @@ static void matrox_w1_hw_init(struct matrox_device *dev) matrox_w1_write_reg(dev, MATROX_GET_CONTROL, 0x00); } -static int __devinit matrox_w1_probe(struct pci_dev *pdev, const struct pci_device_id *ent) +static int matrox_w1_probe(struct pci_dev *pdev, const struct pci_device_id *ent) { struct matrox_device *dev; int err; @@ -220,7 +220,7 @@ err_out_free_device: return err; } -static void __devexit matrox_w1_remove(struct pci_dev *pdev) +static void matrox_w1_remove(struct pci_dev *pdev) { struct matrox_device *dev = pci_get_drvdata(pdev); diff --git a/drivers/w1/masters/mxc_w1.c b/drivers/w1/masters/mxc_w1.c new file mode 100644 index 00000000000..a5df5e89d45 --- /dev/null +++ b/drivers/w1/masters/mxc_w1.c @@ -0,0 +1,182 @@ +/* + * Copyright 2005-2008 Freescale Semiconductor, Inc. All Rights Reserved. + * Copyright 2008 Luotao Fu, kernel@pengutronix.de + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include <linux/clk.h> +#include <linux/delay.h> +#include <linux/io.h> +#include <linux/module.h> +#include <linux/platform_device.h> + +#include "../w1.h" +#include "../w1_int.h" + +/* According to the mx27 Datasheet the reset procedure should take up to about + * 1350us. We set the timeout to 500*100us = 50ms for sure */ +#define MXC_W1_RESET_TIMEOUT 500 + +/* + * MXC W1 Register offsets + */ +#define MXC_W1_CONTROL 0x00 +# define MXC_W1_CONTROL_RDST BIT(3) +# define MXC_W1_CONTROL_WR(x) BIT(5 - (x)) +# define MXC_W1_CONTROL_PST BIT(6) +# define MXC_W1_CONTROL_RPP BIT(7) +#define MXC_W1_TIME_DIVIDER 0x02 +#define MXC_W1_RESET 0x04 + +struct mxc_w1_device { + void __iomem *regs; + struct clk *clk; + struct w1_bus_master bus_master; +}; + +/* + * this is the low level routine to + * reset the device on the One Wire interface + * on the hardware + */ +static u8 mxc_w1_ds2_reset_bus(void *data) +{ + u8 reg_val; + unsigned int timeout_cnt = 0; + struct mxc_w1_device *dev = data; + + writeb(MXC_W1_CONTROL_RPP, (dev->regs + MXC_W1_CONTROL)); + + while (1) { + reg_val = readb(dev->regs + MXC_W1_CONTROL); + + if (!(reg_val & MXC_W1_CONTROL_RPP) || + timeout_cnt > MXC_W1_RESET_TIMEOUT) + break; + else + timeout_cnt++; + + udelay(100); + } + return !(reg_val & MXC_W1_CONTROL_PST); +} + +/* + * this is the low level routine to read/write a bit on the One Wire + * interface on the hardware. It does write 0 if parameter bit is set + * to 0, otherwise a write 1/read. + */ +static u8 mxc_w1_ds2_touch_bit(void *data, u8 bit) +{ + struct mxc_w1_device *mdev = data; + void __iomem *ctrl_addr = mdev->regs + MXC_W1_CONTROL; + unsigned int timeout_cnt = 400; /* Takes max. 120us according to + * datasheet. + */ + + writeb(MXC_W1_CONTROL_WR(bit), ctrl_addr); + + while (timeout_cnt--) { + if (!(readb(ctrl_addr) & MXC_W1_CONTROL_WR(bit))) + break; + + udelay(1); + } + + return !!(readb(ctrl_addr) & MXC_W1_CONTROL_RDST); +} + +static int mxc_w1_probe(struct platform_device *pdev) +{ + struct mxc_w1_device *mdev; + unsigned long clkrate; + struct resource *res; + unsigned int clkdiv; + int err; + + mdev = devm_kzalloc(&pdev->dev, sizeof(struct mxc_w1_device), + GFP_KERNEL); + if (!mdev) + return -ENOMEM; + + mdev->clk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(mdev->clk)) + return PTR_ERR(mdev->clk); + + clkrate = clk_get_rate(mdev->clk); + if (clkrate < 10000000) + dev_warn(&pdev->dev, + "Low clock frequency causes improper function\n"); + + clkdiv = DIV_ROUND_CLOSEST(clkrate, 1000000); + clkrate /= clkdiv; + if ((clkrate < 980000) || (clkrate > 1020000)) + dev_warn(&pdev->dev, + "Incorrect time base frequency %lu Hz\n", clkrate); + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + mdev->regs = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(mdev->regs)) + return PTR_ERR(mdev->regs); + + err = clk_prepare_enable(mdev->clk); + if (err) + return err; + + writeb(clkdiv - 1, mdev->regs + MXC_W1_TIME_DIVIDER); + + mdev->bus_master.data = mdev; + mdev->bus_master.reset_bus = mxc_w1_ds2_reset_bus; + mdev->bus_master.touch_bit = mxc_w1_ds2_touch_bit; + + platform_set_drvdata(pdev, mdev); + + err = w1_add_master_device(&mdev->bus_master); + if (err) + clk_disable_unprepare(mdev->clk); + + return err; +} + +/* + * disassociate the w1 device from the driver + */ +static int mxc_w1_remove(struct platform_device *pdev) +{ + struct mxc_w1_device *mdev = platform_get_drvdata(pdev); + + w1_remove_master_device(&mdev->bus_master); + + clk_disable_unprepare(mdev->clk); + + return 0; +} + +static struct of_device_id mxc_w1_dt_ids[] = { + { .compatible = "fsl,imx21-owire" }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, mxc_w1_dt_ids); + +static struct platform_driver mxc_w1_driver = { + .driver = { + .name = "mxc_w1", + .owner = THIS_MODULE, + .of_match_table = mxc_w1_dt_ids, + }, + .probe = mxc_w1_probe, + .remove = mxc_w1_remove, +}; +module_platform_driver(mxc_w1_driver); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Freescale Semiconductors Inc"); +MODULE_DESCRIPTION("Driver for One-Wire on MXC"); diff --git a/drivers/w1/masters/omap_hdq.c b/drivers/w1/masters/omap_hdq.c new file mode 100644 index 00000000000..9900e8ec739 --- /dev/null +++ b/drivers/w1/masters/omap_hdq.c @@ -0,0 +1,635 @@ +/* + * drivers/w1/masters/omap_hdq.c + * + * Copyright (C) 2007,2012 Texas Instruments, Inc. + * + * This file is licensed under the terms of the GNU General Public License + * version 2. This program is licensed "as is" without any warranty of any + * kind, whether express or implied. + * + */ +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/interrupt.h> +#include <linux/slab.h> +#include <linux/err.h> +#include <linux/io.h> +#include <linux/sched.h> +#include <linux/pm_runtime.h> + +#include "../w1.h" +#include "../w1_int.h" + +#define MOD_NAME "OMAP_HDQ:" + +#define OMAP_HDQ_REVISION 0x00 +#define OMAP_HDQ_TX_DATA 0x04 +#define OMAP_HDQ_RX_DATA 0x08 +#define OMAP_HDQ_CTRL_STATUS 0x0c +#define OMAP_HDQ_CTRL_STATUS_INTERRUPTMASK (1<<6) +#define OMAP_HDQ_CTRL_STATUS_CLOCKENABLE (1<<5) +#define OMAP_HDQ_CTRL_STATUS_GO (1<<4) +#define OMAP_HDQ_CTRL_STATUS_INITIALIZATION (1<<2) +#define OMAP_HDQ_CTRL_STATUS_DIR (1<<1) +#define OMAP_HDQ_CTRL_STATUS_MODE (1<<0) +#define OMAP_HDQ_INT_STATUS 0x10 +#define OMAP_HDQ_INT_STATUS_TXCOMPLETE (1<<2) +#define OMAP_HDQ_INT_STATUS_RXCOMPLETE (1<<1) +#define OMAP_HDQ_INT_STATUS_TIMEOUT (1<<0) +#define OMAP_HDQ_SYSCONFIG 0x14 +#define OMAP_HDQ_SYSCONFIG_SOFTRESET (1<<1) +#define OMAP_HDQ_SYSCONFIG_AUTOIDLE (1<<0) +#define OMAP_HDQ_SYSSTATUS 0x18 +#define OMAP_HDQ_SYSSTATUS_RESETDONE (1<<0) + +#define OMAP_HDQ_FLAG_CLEAR 0 +#define OMAP_HDQ_FLAG_SET 1 +#define OMAP_HDQ_TIMEOUT (HZ/5) + +#define OMAP_HDQ_MAX_USER 4 + +static DECLARE_WAIT_QUEUE_HEAD(hdq_wait_queue); +static int w1_id; + +struct hdq_data { + struct device *dev; + void __iomem *hdq_base; + /* lock status update */ + struct mutex hdq_mutex; + int hdq_usecount; + u8 hdq_irqstatus; + /* device lock */ + spinlock_t hdq_spinlock; + /* + * Used to control the call to omap_hdq_get and omap_hdq_put. + * HDQ Protocol: Write the CMD|REG_address first, followed by + * the data wrire or read. + */ + int init_trans; +}; + +static int omap_hdq_probe(struct platform_device *pdev); +static int omap_hdq_remove(struct platform_device *pdev); + +static struct platform_driver omap_hdq_driver = { + .probe = omap_hdq_probe, + .remove = omap_hdq_remove, + .driver = { + .name = "omap_hdq", + }, +}; + +static u8 omap_w1_read_byte(void *_hdq); +static void omap_w1_write_byte(void *_hdq, u8 byte); +static u8 omap_w1_reset_bus(void *_hdq); +static void omap_w1_search_bus(void *_hdq, struct w1_master *master_dev, + u8 search_type, w1_slave_found_callback slave_found); + + +static struct w1_bus_master omap_w1_master = { + .read_byte = omap_w1_read_byte, + .write_byte = omap_w1_write_byte, + .reset_bus = omap_w1_reset_bus, + .search = omap_w1_search_bus, +}; + +/* HDQ register I/O routines */ +static inline u8 hdq_reg_in(struct hdq_data *hdq_data, u32 offset) +{ + return __raw_readl(hdq_data->hdq_base + offset); +} + +static inline void hdq_reg_out(struct hdq_data *hdq_data, u32 offset, u8 val) +{ + __raw_writel(val, hdq_data->hdq_base + offset); +} + +static inline u8 hdq_reg_merge(struct hdq_data *hdq_data, u32 offset, + u8 val, u8 mask) +{ + u8 new_val = (__raw_readl(hdq_data->hdq_base + offset) & ~mask) + | (val & mask); + __raw_writel(new_val, hdq_data->hdq_base + offset); + + return new_val; +} + +/* + * Wait for one or more bits in flag change. + * HDQ_FLAG_SET: wait until any bit in the flag is set. + * HDQ_FLAG_CLEAR: wait until all bits in the flag are cleared. + * return 0 on success and -ETIMEDOUT in the case of timeout. + */ +static int hdq_wait_for_flag(struct hdq_data *hdq_data, u32 offset, + u8 flag, u8 flag_set, u8 *status) +{ + int ret = 0; + unsigned long timeout = jiffies + OMAP_HDQ_TIMEOUT; + + if (flag_set == OMAP_HDQ_FLAG_CLEAR) { + /* wait for the flag clear */ + while (((*status = hdq_reg_in(hdq_data, offset)) & flag) + && time_before(jiffies, timeout)) { + schedule_timeout_uninterruptible(1); + } + if (*status & flag) + ret = -ETIMEDOUT; + } else if (flag_set == OMAP_HDQ_FLAG_SET) { + /* wait for the flag set */ + while (!((*status = hdq_reg_in(hdq_data, offset)) & flag) + && time_before(jiffies, timeout)) { + schedule_timeout_uninterruptible(1); + } + if (!(*status & flag)) + ret = -ETIMEDOUT; + } else + return -EINVAL; + + return ret; +} + +/* write out a byte and fill *status with HDQ_INT_STATUS */ +static int hdq_write_byte(struct hdq_data *hdq_data, u8 val, u8 *status) +{ + int ret; + u8 tmp_status; + unsigned long irqflags; + + *status = 0; + + spin_lock_irqsave(&hdq_data->hdq_spinlock, irqflags); + /* clear interrupt flags via a dummy read */ + hdq_reg_in(hdq_data, OMAP_HDQ_INT_STATUS); + /* ISR loads it with new INT_STATUS */ + hdq_data->hdq_irqstatus = 0; + spin_unlock_irqrestore(&hdq_data->hdq_spinlock, irqflags); + + hdq_reg_out(hdq_data, OMAP_HDQ_TX_DATA, val); + + /* set the GO bit */ + hdq_reg_merge(hdq_data, OMAP_HDQ_CTRL_STATUS, OMAP_HDQ_CTRL_STATUS_GO, + OMAP_HDQ_CTRL_STATUS_DIR | OMAP_HDQ_CTRL_STATUS_GO); + /* wait for the TXCOMPLETE bit */ + ret = wait_event_timeout(hdq_wait_queue, + hdq_data->hdq_irqstatus, OMAP_HDQ_TIMEOUT); + if (ret == 0) { + dev_dbg(hdq_data->dev, "TX wait elapsed\n"); + ret = -ETIMEDOUT; + goto out; + } + + *status = hdq_data->hdq_irqstatus; + /* check irqstatus */ + if (!(*status & OMAP_HDQ_INT_STATUS_TXCOMPLETE)) { + dev_dbg(hdq_data->dev, "timeout waiting for" + " TXCOMPLETE/RXCOMPLETE, %x", *status); + ret = -ETIMEDOUT; + goto out; + } + + /* wait for the GO bit return to zero */ + ret = hdq_wait_for_flag(hdq_data, OMAP_HDQ_CTRL_STATUS, + OMAP_HDQ_CTRL_STATUS_GO, + OMAP_HDQ_FLAG_CLEAR, &tmp_status); + if (ret) { + dev_dbg(hdq_data->dev, "timeout waiting GO bit" + " return to zero, %x", tmp_status); + } + +out: + return ret; +} + +/* HDQ Interrupt service routine */ +static irqreturn_t hdq_isr(int irq, void *_hdq) +{ + struct hdq_data *hdq_data = _hdq; + unsigned long irqflags; + + spin_lock_irqsave(&hdq_data->hdq_spinlock, irqflags); + hdq_data->hdq_irqstatus = hdq_reg_in(hdq_data, OMAP_HDQ_INT_STATUS); + spin_unlock_irqrestore(&hdq_data->hdq_spinlock, irqflags); + dev_dbg(hdq_data->dev, "hdq_isr: %x", hdq_data->hdq_irqstatus); + + if (hdq_data->hdq_irqstatus & + (OMAP_HDQ_INT_STATUS_TXCOMPLETE | OMAP_HDQ_INT_STATUS_RXCOMPLETE + | OMAP_HDQ_INT_STATUS_TIMEOUT)) { + /* wake up sleeping process */ + wake_up(&hdq_wait_queue); + } + + return IRQ_HANDLED; +} + +/* HDQ Mode: always return success */ +static u8 omap_w1_reset_bus(void *_hdq) +{ + return 0; +} + +/* W1 search callback function */ +static void omap_w1_search_bus(void *_hdq, struct w1_master *master_dev, + u8 search_type, w1_slave_found_callback slave_found) +{ + u64 module_id, rn_le, cs, id; + + if (w1_id) + module_id = w1_id; + else + module_id = 0x1; + + rn_le = cpu_to_le64(module_id); + /* + * HDQ might not obey truly the 1-wire spec. + * So calculate CRC based on module parameter. + */ + cs = w1_calc_crc8((u8 *)&rn_le, 7); + id = (cs << 56) | module_id; + + slave_found(master_dev, id); +} + +static int _omap_hdq_reset(struct hdq_data *hdq_data) +{ + int ret; + u8 tmp_status; + + hdq_reg_out(hdq_data, OMAP_HDQ_SYSCONFIG, OMAP_HDQ_SYSCONFIG_SOFTRESET); + /* + * Select HDQ mode & enable clocks. + * It is observed that INT flags can't be cleared via a read and GO/INIT + * won't return to zero if interrupt is disabled. So we always enable + * interrupt. + */ + hdq_reg_out(hdq_data, OMAP_HDQ_CTRL_STATUS, + OMAP_HDQ_CTRL_STATUS_CLOCKENABLE | + OMAP_HDQ_CTRL_STATUS_INTERRUPTMASK); + + /* wait for reset to complete */ + ret = hdq_wait_for_flag(hdq_data, OMAP_HDQ_SYSSTATUS, + OMAP_HDQ_SYSSTATUS_RESETDONE, OMAP_HDQ_FLAG_SET, &tmp_status); + if (ret) + dev_dbg(hdq_data->dev, "timeout waiting HDQ reset, %x", + tmp_status); + else { + hdq_reg_out(hdq_data, OMAP_HDQ_CTRL_STATUS, + OMAP_HDQ_CTRL_STATUS_CLOCKENABLE | + OMAP_HDQ_CTRL_STATUS_INTERRUPTMASK); + hdq_reg_out(hdq_data, OMAP_HDQ_SYSCONFIG, + OMAP_HDQ_SYSCONFIG_AUTOIDLE); + } + + return ret; +} + +/* Issue break pulse to the device */ +static int omap_hdq_break(struct hdq_data *hdq_data) +{ + int ret = 0; + u8 tmp_status; + unsigned long irqflags; + + ret = mutex_lock_interruptible(&hdq_data->hdq_mutex); + if (ret < 0) { + dev_dbg(hdq_data->dev, "Could not acquire mutex\n"); + ret = -EINTR; + goto rtn; + } + + spin_lock_irqsave(&hdq_data->hdq_spinlock, irqflags); + /* clear interrupt flags via a dummy read */ + hdq_reg_in(hdq_data, OMAP_HDQ_INT_STATUS); + /* ISR loads it with new INT_STATUS */ + hdq_data->hdq_irqstatus = 0; + spin_unlock_irqrestore(&hdq_data->hdq_spinlock, irqflags); + + /* set the INIT and GO bit */ + hdq_reg_merge(hdq_data, OMAP_HDQ_CTRL_STATUS, + OMAP_HDQ_CTRL_STATUS_INITIALIZATION | OMAP_HDQ_CTRL_STATUS_GO, + OMAP_HDQ_CTRL_STATUS_DIR | OMAP_HDQ_CTRL_STATUS_INITIALIZATION | + OMAP_HDQ_CTRL_STATUS_GO); + + /* wait for the TIMEOUT bit */ + ret = wait_event_timeout(hdq_wait_queue, + hdq_data->hdq_irqstatus, OMAP_HDQ_TIMEOUT); + if (ret == 0) { + dev_dbg(hdq_data->dev, "break wait elapsed\n"); + ret = -EINTR; + goto out; + } + + tmp_status = hdq_data->hdq_irqstatus; + /* check irqstatus */ + if (!(tmp_status & OMAP_HDQ_INT_STATUS_TIMEOUT)) { + dev_dbg(hdq_data->dev, "timeout waiting for TIMEOUT, %x", + tmp_status); + ret = -ETIMEDOUT; + goto out; + } + /* + * wait for both INIT and GO bits rerurn to zero. + * zero wait time expected for interrupt mode. + */ + ret = hdq_wait_for_flag(hdq_data, OMAP_HDQ_CTRL_STATUS, + OMAP_HDQ_CTRL_STATUS_INITIALIZATION | + OMAP_HDQ_CTRL_STATUS_GO, OMAP_HDQ_FLAG_CLEAR, + &tmp_status); + if (ret) + dev_dbg(hdq_data->dev, "timeout waiting INIT&GO bits" + " return to zero, %x", tmp_status); + +out: + mutex_unlock(&hdq_data->hdq_mutex); +rtn: + return ret; +} + +static int hdq_read_byte(struct hdq_data *hdq_data, u8 *val) +{ + int ret = 0; + u8 status; + + ret = mutex_lock_interruptible(&hdq_data->hdq_mutex); + if (ret < 0) { + ret = -EINTR; + goto rtn; + } + + if (!hdq_data->hdq_usecount) { + ret = -EINVAL; + goto out; + } + + if (!(hdq_data->hdq_irqstatus & OMAP_HDQ_INT_STATUS_RXCOMPLETE)) { + hdq_reg_merge(hdq_data, OMAP_HDQ_CTRL_STATUS, + OMAP_HDQ_CTRL_STATUS_DIR | OMAP_HDQ_CTRL_STATUS_GO, + OMAP_HDQ_CTRL_STATUS_DIR | OMAP_HDQ_CTRL_STATUS_GO); + /* + * The RX comes immediately after TX. + */ + wait_event_timeout(hdq_wait_queue, + (hdq_data->hdq_irqstatus + & OMAP_HDQ_INT_STATUS_RXCOMPLETE), + OMAP_HDQ_TIMEOUT); + + hdq_reg_merge(hdq_data, OMAP_HDQ_CTRL_STATUS, 0, + OMAP_HDQ_CTRL_STATUS_DIR); + status = hdq_data->hdq_irqstatus; + /* check irqstatus */ + if (!(status & OMAP_HDQ_INT_STATUS_RXCOMPLETE)) { + dev_dbg(hdq_data->dev, "timeout waiting for" + " RXCOMPLETE, %x", status); + ret = -ETIMEDOUT; + goto out; + } + } + /* the data is ready. Read it in! */ + *val = hdq_reg_in(hdq_data, OMAP_HDQ_RX_DATA); +out: + mutex_unlock(&hdq_data->hdq_mutex); +rtn: + return ret; + +} + +/* Enable clocks and set the controller to HDQ mode */ +static int omap_hdq_get(struct hdq_data *hdq_data) +{ + int ret = 0; + + ret = mutex_lock_interruptible(&hdq_data->hdq_mutex); + if (ret < 0) { + ret = -EINTR; + goto rtn; + } + + if (OMAP_HDQ_MAX_USER == hdq_data->hdq_usecount) { + dev_dbg(hdq_data->dev, "attempt to exceed the max use count"); + ret = -EINVAL; + goto out; + } else { + hdq_data->hdq_usecount++; + try_module_get(THIS_MODULE); + if (1 == hdq_data->hdq_usecount) { + + pm_runtime_get_sync(hdq_data->dev); + + /* make sure HDQ is out of reset */ + if (!(hdq_reg_in(hdq_data, OMAP_HDQ_SYSSTATUS) & + OMAP_HDQ_SYSSTATUS_RESETDONE)) { + ret = _omap_hdq_reset(hdq_data); + if (ret) + /* back up the count */ + hdq_data->hdq_usecount--; + } else { + /* select HDQ mode & enable clocks */ + hdq_reg_out(hdq_data, OMAP_HDQ_CTRL_STATUS, + OMAP_HDQ_CTRL_STATUS_CLOCKENABLE | + OMAP_HDQ_CTRL_STATUS_INTERRUPTMASK); + hdq_reg_out(hdq_data, OMAP_HDQ_SYSCONFIG, + OMAP_HDQ_SYSCONFIG_AUTOIDLE); + hdq_reg_in(hdq_data, OMAP_HDQ_INT_STATUS); + } + } + } + +out: + mutex_unlock(&hdq_data->hdq_mutex); +rtn: + return ret; +} + +/* Disable clocks to the module */ +static int omap_hdq_put(struct hdq_data *hdq_data) +{ + int ret = 0; + + ret = mutex_lock_interruptible(&hdq_data->hdq_mutex); + if (ret < 0) + return -EINTR; + + if (0 == hdq_data->hdq_usecount) { + dev_dbg(hdq_data->dev, "attempt to decrement use count" + " when it is zero"); + ret = -EINVAL; + } else { + hdq_data->hdq_usecount--; + module_put(THIS_MODULE); + if (0 == hdq_data->hdq_usecount) + pm_runtime_put_sync(hdq_data->dev); + } + mutex_unlock(&hdq_data->hdq_mutex); + + return ret; +} + +/* Read a byte of data from the device */ +static u8 omap_w1_read_byte(void *_hdq) +{ + struct hdq_data *hdq_data = _hdq; + u8 val = 0; + int ret; + + ret = hdq_read_byte(hdq_data, &val); + if (ret) { + ret = mutex_lock_interruptible(&hdq_data->hdq_mutex); + if (ret < 0) { + dev_dbg(hdq_data->dev, "Could not acquire mutex\n"); + return -EINTR; + } + hdq_data->init_trans = 0; + mutex_unlock(&hdq_data->hdq_mutex); + omap_hdq_put(hdq_data); + return -1; + } + + /* Write followed by a read, release the module */ + if (hdq_data->init_trans) { + ret = mutex_lock_interruptible(&hdq_data->hdq_mutex); + if (ret < 0) { + dev_dbg(hdq_data->dev, "Could not acquire mutex\n"); + return -EINTR; + } + hdq_data->init_trans = 0; + mutex_unlock(&hdq_data->hdq_mutex); + omap_hdq_put(hdq_data); + } + + return val; +} + +/* Write a byte of data to the device */ +static void omap_w1_write_byte(void *_hdq, u8 byte) +{ + struct hdq_data *hdq_data = _hdq; + int ret; + u8 status; + + /* First write to initialize the transfer */ + if (hdq_data->init_trans == 0) + omap_hdq_get(hdq_data); + + ret = mutex_lock_interruptible(&hdq_data->hdq_mutex); + if (ret < 0) { + dev_dbg(hdq_data->dev, "Could not acquire mutex\n"); + return; + } + hdq_data->init_trans++; + mutex_unlock(&hdq_data->hdq_mutex); + + ret = hdq_write_byte(hdq_data, byte, &status); + if (ret < 0) { + dev_dbg(hdq_data->dev, "TX failure:Ctrl status %x\n", status); + return; + } + + /* Second write, data transferred. Release the module */ + if (hdq_data->init_trans > 1) { + omap_hdq_put(hdq_data); + ret = mutex_lock_interruptible(&hdq_data->hdq_mutex); + if (ret < 0) { + dev_dbg(hdq_data->dev, "Could not acquire mutex\n"); + return; + } + hdq_data->init_trans = 0; + mutex_unlock(&hdq_data->hdq_mutex); + } +} + +static int omap_hdq_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct hdq_data *hdq_data; + struct resource *res; + int ret, irq; + u8 rev; + + hdq_data = devm_kzalloc(dev, sizeof(*hdq_data), GFP_KERNEL); + if (!hdq_data) { + dev_dbg(&pdev->dev, "unable to allocate memory\n"); + return -ENOMEM; + } + + hdq_data->dev = dev; + platform_set_drvdata(pdev, hdq_data); + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + hdq_data->hdq_base = devm_ioremap_resource(dev, res); + if (IS_ERR(hdq_data->hdq_base)) + return PTR_ERR(hdq_data->hdq_base); + + hdq_data->hdq_usecount = 0; + mutex_init(&hdq_data->hdq_mutex); + + pm_runtime_enable(&pdev->dev); + pm_runtime_get_sync(&pdev->dev); + + rev = hdq_reg_in(hdq_data, OMAP_HDQ_REVISION); + dev_info(&pdev->dev, "OMAP HDQ Hardware Rev %c.%c. Driver in %s mode\n", + (rev >> 4) + '0', (rev & 0x0f) + '0', "Interrupt"); + + spin_lock_init(&hdq_data->hdq_spinlock); + + irq = platform_get_irq(pdev, 0); + if (irq < 0) { + ret = -ENXIO; + goto err_irq; + } + + ret = devm_request_irq(dev, irq, hdq_isr, 0, "omap_hdq", hdq_data); + if (ret < 0) { + dev_dbg(&pdev->dev, "could not request irq\n"); + goto err_irq; + } + + omap_hdq_break(hdq_data); + + pm_runtime_put_sync(&pdev->dev); + + omap_w1_master.data = hdq_data; + + ret = w1_add_master_device(&omap_w1_master); + if (ret) { + dev_dbg(&pdev->dev, "Failure in registering w1 master\n"); + goto err_w1; + } + + return 0; + +err_irq: + pm_runtime_put_sync(&pdev->dev); +err_w1: + pm_runtime_disable(&pdev->dev); + + return ret; +} + +static int omap_hdq_remove(struct platform_device *pdev) +{ + struct hdq_data *hdq_data = platform_get_drvdata(pdev); + + mutex_lock(&hdq_data->hdq_mutex); + + if (hdq_data->hdq_usecount) { + dev_dbg(&pdev->dev, "removed when use count is not zero\n"); + mutex_unlock(&hdq_data->hdq_mutex); + return -EBUSY; + } + + mutex_unlock(&hdq_data->hdq_mutex); + + /* remove module dependency */ + pm_runtime_disable(&pdev->dev); + + return 0; +} + +module_platform_driver(omap_hdq_driver); + +module_param(w1_id, int, S_IRUSR); +MODULE_PARM_DESC(w1_id, "1-wire id for the slave detection"); + +MODULE_AUTHOR("Texas Instruments"); +MODULE_DESCRIPTION("HDQ driver Library"); +MODULE_LICENSE("GPL"); diff --git a/drivers/w1/masters/w1-gpio.c b/drivers/w1/masters/w1-gpio.c index 9e1138a75e8..1d111e56c8c 100644 --- a/drivers/w1/masters/w1-gpio.c +++ b/drivers/w1/masters/w1-gpio.c @@ -11,12 +11,37 @@ #include <linux/init.h> #include <linux/module.h> #include <linux/platform_device.h> +#include <linux/slab.h> #include <linux/w1-gpio.h> +#include <linux/gpio.h> +#include <linux/of_platform.h> +#include <linux/of_gpio.h> +#include <linux/err.h> +#include <linux/of.h> +#include <linux/delay.h> #include "../w1.h" #include "../w1_int.h" -#include <asm/gpio.h> +static u8 w1_gpio_set_pullup(void *data, int delay) +{ + struct w1_gpio_platform_data *pdata = data; + + if (delay) { + pdata->pullup_duration = delay; + } else { + if (pdata->pullup_duration) { + gpio_direction_output(pdata->pin, 1); + + msleep(pdata->pullup_duration); + + gpio_direction_input(pdata->pin); + } + pdata->pullup_duration = 0; + } + + return 0; +} static void w1_gpio_write_bit_dir(void *data, u8 bit) { @@ -39,25 +64,94 @@ static u8 w1_gpio_read_bit(void *data) { struct w1_gpio_platform_data *pdata = data; - return gpio_get_value(pdata->pin); + return gpio_get_value(pdata->pin) ? 1 : 0; } -static int __init w1_gpio_probe(struct platform_device *pdev) +#if defined(CONFIG_OF) +static struct of_device_id w1_gpio_dt_ids[] = { + { .compatible = "w1-gpio" }, + {} +}; +MODULE_DEVICE_TABLE(of, w1_gpio_dt_ids); +#endif + +static int w1_gpio_probe_dt(struct platform_device *pdev) +{ + struct w1_gpio_platform_data *pdata = dev_get_platdata(&pdev->dev); + struct device_node *np = pdev->dev.of_node; + int gpio; + + pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); + if (!pdata) + return -ENOMEM; + + if (of_get_property(np, "linux,open-drain", NULL)) + pdata->is_open_drain = 1; + + gpio = of_get_gpio(np, 0); + if (gpio < 0) { + if (gpio != -EPROBE_DEFER) + dev_err(&pdev->dev, + "Failed to parse gpio property for data pin (%d)\n", + gpio); + + return gpio; + } + pdata->pin = gpio; + + gpio = of_get_gpio(np, 1); + if (gpio == -EPROBE_DEFER) + return gpio; + /* ignore other errors as the pullup gpio is optional */ + pdata->ext_pullup_enable_pin = gpio; + + pdev->dev.platform_data = pdata; + + return 0; +} + +static int w1_gpio_probe(struct platform_device *pdev) { struct w1_bus_master *master; - struct w1_gpio_platform_data *pdata = pdev->dev.platform_data; + struct w1_gpio_platform_data *pdata; int err; - if (!pdata) + if (of_have_populated_dt()) { + err = w1_gpio_probe_dt(pdev); + if (err < 0) + return err; + } + + pdata = dev_get_platdata(&pdev->dev); + + if (!pdata) { + dev_err(&pdev->dev, "No configuration data\n"); return -ENXIO; + } - master = kzalloc(sizeof(struct w1_bus_master), GFP_KERNEL); - if (!master) + master = devm_kzalloc(&pdev->dev, sizeof(struct w1_bus_master), + GFP_KERNEL); + if (!master) { + dev_err(&pdev->dev, "Out of memory\n"); return -ENOMEM; + } + + err = devm_gpio_request(&pdev->dev, pdata->pin, "w1"); + if (err) { + dev_err(&pdev->dev, "gpio_request (pin) failed\n"); + return err; + } - err = gpio_request(pdata->pin, "w1"); - if (err) - goto free_master; + if (gpio_is_valid(pdata->ext_pullup_enable_pin)) { + err = devm_gpio_request_one(&pdev->dev, + pdata->ext_pullup_enable_pin, GPIOF_INIT_LOW, + "w1 pullup"); + if (err < 0) { + dev_err(&pdev->dev, "gpio_request_one " + "(ext_pullup_enable_pin) failed\n"); + return err; + } + } master->data = pdata; master->read_bit = w1_gpio_read_bit; @@ -68,56 +162,82 @@ static int __init w1_gpio_probe(struct platform_device *pdev) } else { gpio_direction_input(pdata->pin); master->write_bit = w1_gpio_write_bit_dir; + master->set_pullup = w1_gpio_set_pullup; } err = w1_add_master_device(master); - if (err) - goto free_gpio; + if (err) { + dev_err(&pdev->dev, "w1_add_master device failed\n"); + return err; + } - platform_set_drvdata(pdev, master); + if (pdata->enable_external_pullup) + pdata->enable_external_pullup(1); - return 0; + if (gpio_is_valid(pdata->ext_pullup_enable_pin)) + gpio_set_value(pdata->ext_pullup_enable_pin, 1); - free_gpio: - gpio_free(pdata->pin); - free_master: - kfree(master); + platform_set_drvdata(pdev, master); - return err; + return 0; } -static int __exit w1_gpio_remove(struct platform_device *pdev) +static int w1_gpio_remove(struct platform_device *pdev) { struct w1_bus_master *master = platform_get_drvdata(pdev); - struct w1_gpio_platform_data *pdata = pdev->dev.platform_data; + struct w1_gpio_platform_data *pdata = dev_get_platdata(&pdev->dev); + + if (pdata->enable_external_pullup) + pdata->enable_external_pullup(0); + + if (gpio_is_valid(pdata->ext_pullup_enable_pin)) + gpio_set_value(pdata->ext_pullup_enable_pin, 0); w1_remove_master_device(master); - gpio_free(pdata->pin); - kfree(master); return 0; } -static struct platform_driver w1_gpio_driver = { - .driver = { - .name = "w1-gpio", - .owner = THIS_MODULE, - }, - .remove = __exit_p(w1_gpio_remove), -}; +#ifdef CONFIG_PM -static int __init w1_gpio_init(void) +static int w1_gpio_suspend(struct platform_device *pdev, pm_message_t state) { - return platform_driver_probe(&w1_gpio_driver, w1_gpio_probe); + struct w1_gpio_platform_data *pdata = dev_get_platdata(&pdev->dev); + + if (pdata->enable_external_pullup) + pdata->enable_external_pullup(0); + + return 0; } -static void __exit w1_gpio_exit(void) +static int w1_gpio_resume(struct platform_device *pdev) { - platform_driver_unregister(&w1_gpio_driver); + struct w1_gpio_platform_data *pdata = dev_get_platdata(&pdev->dev); + + if (pdata->enable_external_pullup) + pdata->enable_external_pullup(1); + + return 0; } -module_init(w1_gpio_init); -module_exit(w1_gpio_exit); +#else +#define w1_gpio_suspend NULL +#define w1_gpio_resume NULL +#endif + +static struct platform_driver w1_gpio_driver = { + .driver = { + .name = "w1-gpio", + .owner = THIS_MODULE, + .of_match_table = of_match_ptr(w1_gpio_dt_ids), + }, + .probe = w1_gpio_probe, + .remove = w1_gpio_remove, + .suspend = w1_gpio_suspend, + .resume = w1_gpio_resume, +}; + +module_platform_driver(w1_gpio_driver); MODULE_DESCRIPTION("GPIO w1 bus master driver"); MODULE_AUTHOR("Ville Syrjala <syrjala@sci.fi>"); diff --git a/drivers/w1/slaves/Kconfig b/drivers/w1/slaves/Kconfig index 3df29a122f8..1cdce80b6ab 100644 --- a/drivers/w1/slaves/Kconfig +++ b/drivers/w1/slaves/Kconfig @@ -16,6 +16,45 @@ config W1_SLAVE_SMEM Say Y here if you want to connect 1-wire simple 64bit memory rom(ds2401/ds2411/ds1990*) to your wire. +config W1_SLAVE_DS2408 + tristate "8-Channel Addressable Switch (IO Expander) 0x29 family support (DS2408)" + help + Say Y here if you want to use a 1-wire + DS2408 8-Channel Addressable Switch device support + +config W1_SLAVE_DS2408_READBACK + bool "Read-back values written to DS2408's output register" + depends on W1_SLAVE_DS2408 + default y + help + Enabling this will cause the driver to read back the values written + to the chip's output register in order to detect errors. + + This is slower but useful when debugging chips and/or busses. + +config W1_SLAVE_DS2413 + tristate "Dual Channel Addressable Switch 0x3a family support (DS2413)" + help + Say Y here if you want to use a 1-wire + DS2413 Dual Channel Addressable Switch device support + +config W1_SLAVE_DS2423 + tristate "Counter 1-wire device (DS2423)" + select CRC16 + help + If you enable this you can read the counter values available + in the DS2423 chipset from the w1_slave file under the + sys file system. + + Say Y here if you want to use a 1-wire + counter family device (DS2423). + +config W1_SLAVE_DS2431 + tristate "1kb EEPROM family support (DS2431)" + help + Say Y here if you want to use a 1-wire + 1kb EEPROM family device (DS2431) + config W1_SLAVE_DS2433 tristate "4kb EEPROM family support (DS2433)" help @@ -33,7 +72,6 @@ config W1_SLAVE_DS2433_CRC config W1_SLAVE_DS2760 tristate "Dallas 2760 battery monitor chip (HP iPAQ & others)" - depends on W1 help If you enable this you will have the DS2760 battery monitor chip support. @@ -44,4 +82,46 @@ config W1_SLAVE_DS2760 If you are unsure, say N. +config W1_SLAVE_DS2780 + tristate "Dallas 2780 battery monitor chip" + help + If you enable this you will have the DS2780 battery monitor + chip support. + + The battery monitor chip is used in many batteries/devices + as the one who is responsible for charging/discharging/monitoring + Li+ batteries. + + If you are unsure, say N. + +config W1_SLAVE_DS2781 + tristate "Dallas 2781 battery monitor chip" + help + If you enable this you will have the DS2781 battery monitor + chip support. + + The battery monitor chip is used in many batteries/devices + as the one who is responsible for charging/discharging/monitoring + Li+ batteries. + + If you are unsure, say N. + +config W1_SLAVE_DS28E04 + tristate "4096-Bit Addressable 1-Wire EEPROM with PIO (DS28E04-100)" + select CRC16 + help + If you enable this you will have the DS28E04-100 + chip support. + + Say Y here if you want to use a 1-wire + 4kb EEPROM with PIO family device (DS28E04). + + If you are unsure, say N. + +config W1_SLAVE_BQ27000 + tristate "BQ27000 slave support" + help + Say Y here if you want to use a hdq + bq27000 slave support. + endmenu diff --git a/drivers/w1/slaves/Makefile b/drivers/w1/slaves/Makefile index a8eb7524df1..06529f3157a 100644 --- a/drivers/w1/slaves/Makefile +++ b/drivers/w1/slaves/Makefile @@ -4,6 +4,13 @@ obj-$(CONFIG_W1_SLAVE_THERM) += w1_therm.o obj-$(CONFIG_W1_SLAVE_SMEM) += w1_smem.o +obj-$(CONFIG_W1_SLAVE_DS2408) += w1_ds2408.o +obj-$(CONFIG_W1_SLAVE_DS2413) += w1_ds2413.o +obj-$(CONFIG_W1_SLAVE_DS2423) += w1_ds2423.o +obj-$(CONFIG_W1_SLAVE_DS2431) += w1_ds2431.o obj-$(CONFIG_W1_SLAVE_DS2433) += w1_ds2433.o obj-$(CONFIG_W1_SLAVE_DS2760) += w1_ds2760.o - +obj-$(CONFIG_W1_SLAVE_DS2780) += w1_ds2780.o +obj-$(CONFIG_W1_SLAVE_DS2781) += w1_ds2781.o +obj-$(CONFIG_W1_SLAVE_BQ27000) += w1_bq27000.o +obj-$(CONFIG_W1_SLAVE_DS28E04) += w1_ds28e04.o diff --git a/drivers/w1/slaves/w1_bq27000.c b/drivers/w1/slaves/w1_bq27000.c new file mode 100644 index 00000000000..afbefed5f2c --- /dev/null +++ b/drivers/w1/slaves/w1_bq27000.c @@ -0,0 +1,117 @@ +/* + * drivers/w1/slaves/w1_bq27000.c + * + * Copyright (C) 2007 Texas Instruments, Inc. + * + * This file is licensed under the terms of the GNU General Public License + * version 2. This program is licensed "as is" without any warranty of any + * kind, whether express or implied. + * + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/device.h> +#include <linux/types.h> +#include <linux/platform_device.h> +#include <linux/mutex.h> +#include <linux/power/bq27x00_battery.h> + +#include "../w1.h" +#include "../w1_int.h" +#include "../w1_family.h" + +#define HDQ_CMD_READ (0) +#define HDQ_CMD_WRITE (1<<7) + +static int F_ID; + +static int w1_bq27000_read(struct device *dev, unsigned int reg) +{ + u8 val; + struct w1_slave *sl = container_of(dev->parent, struct w1_slave, dev); + + mutex_lock(&sl->master->bus_mutex); + w1_write_8(sl->master, HDQ_CMD_READ | reg); + val = w1_read_8(sl->master); + mutex_unlock(&sl->master->bus_mutex); + + return val; +} + +static struct bq27000_platform_data bq27000_battery_info = { + .read = w1_bq27000_read, + .name = "bq27000-battery", +}; + +static int w1_bq27000_add_slave(struct w1_slave *sl) +{ + int ret; + struct platform_device *pdev; + + pdev = platform_device_alloc("bq27000-battery", -1); + if (!pdev) { + ret = -ENOMEM; + return ret; + } + ret = platform_device_add_data(pdev, + &bq27000_battery_info, + sizeof(bq27000_battery_info)); + if (ret) + goto pdev_add_failed; + pdev->dev.parent = &sl->dev; + + ret = platform_device_add(pdev); + if (ret) + goto pdev_add_failed; + + dev_set_drvdata(&sl->dev, pdev); + + goto success; + +pdev_add_failed: + platform_device_put(pdev); +success: + return ret; +} + +static void w1_bq27000_remove_slave(struct w1_slave *sl) +{ + struct platform_device *pdev = dev_get_drvdata(&sl->dev); + + platform_device_unregister(pdev); +} + +static struct w1_family_ops w1_bq27000_fops = { + .add_slave = w1_bq27000_add_slave, + .remove_slave = w1_bq27000_remove_slave, +}; + +static struct w1_family w1_bq27000_family = { + .fid = 1, + .fops = &w1_bq27000_fops, +}; + +static int __init w1_bq27000_init(void) +{ + if (F_ID) + w1_bq27000_family.fid = F_ID; + + return w1_register_family(&w1_bq27000_family); +} + +static void __exit w1_bq27000_exit(void) +{ + w1_unregister_family(&w1_bq27000_family); +} + + +module_init(w1_bq27000_init); +module_exit(w1_bq27000_exit); + +module_param(F_ID, int, S_IRUSR); +MODULE_PARM_DESC(F_ID, "1-wire slave FID for BQ device"); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Texas Instruments Ltd"); +MODULE_DESCRIPTION("HDQ/1-wire slave driver bq27000 battery monitor chip"); diff --git a/drivers/w1/slaves/w1_ds2408.c b/drivers/w1/slaves/w1_ds2408.c new file mode 100644 index 00000000000..7dfa0e11688 --- /dev/null +++ b/drivers/w1/slaves/w1_ds2408.c @@ -0,0 +1,366 @@ +/* + * w1_ds2408.c - w1 family 29 (DS2408) driver + * + * Copyright (c) 2010 Jean-Francois Dagenais <dagenaisj@sonatest.com> + * + * This source code is licensed under the GNU General Public License, + * Version 2. See the file COPYING for more details. + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/moduleparam.h> +#include <linux/device.h> +#include <linux/types.h> +#include <linux/delay.h> +#include <linux/slab.h> + +#include "../w1.h" +#include "../w1_int.h" +#include "../w1_family.h" + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Jean-Francois Dagenais <dagenaisj@sonatest.com>"); +MODULE_DESCRIPTION("w1 family 29 driver for DS2408 8 Pin IO"); +MODULE_ALIAS("w1-family-" __stringify(W1_FAMILY_DS2408)); + + +#define W1_F29_RETRIES 3 + +#define W1_F29_REG_LOGIG_STATE 0x88 /* R */ +#define W1_F29_REG_OUTPUT_LATCH_STATE 0x89 /* R */ +#define W1_F29_REG_ACTIVITY_LATCH_STATE 0x8A /* R */ +#define W1_F29_REG_COND_SEARCH_SELECT_MASK 0x8B /* RW */ +#define W1_F29_REG_COND_SEARCH_POL_SELECT 0x8C /* RW */ +#define W1_F29_REG_CONTROL_AND_STATUS 0x8D /* RW */ + +#define W1_F29_FUNC_READ_PIO_REGS 0xF0 +#define W1_F29_FUNC_CHANN_ACCESS_READ 0xF5 +#define W1_F29_FUNC_CHANN_ACCESS_WRITE 0x5A +/* also used to write the control/status reg (0x8D): */ +#define W1_F29_FUNC_WRITE_COND_SEARCH_REG 0xCC +#define W1_F29_FUNC_RESET_ACTIVITY_LATCHES 0xC3 + +#define W1_F29_SUCCESS_CONFIRM_BYTE 0xAA + +static int _read_reg(struct w1_slave *sl, u8 address, unsigned char* buf) +{ + u8 wrbuf[3]; + dev_dbg(&sl->dev, + "Reading with slave: %p, reg addr: %0#4x, buff addr: %p", + sl, (unsigned int)address, buf); + + if (!buf) + return -EINVAL; + + mutex_lock(&sl->master->bus_mutex); + dev_dbg(&sl->dev, "mutex locked"); + + if (w1_reset_select_slave(sl)) { + mutex_unlock(&sl->master->bus_mutex); + return -EIO; + } + + wrbuf[0] = W1_F29_FUNC_READ_PIO_REGS; + wrbuf[1] = address; + wrbuf[2] = 0; + w1_write_block(sl->master, wrbuf, 3); + *buf = w1_read_8(sl->master); + + mutex_unlock(&sl->master->bus_mutex); + dev_dbg(&sl->dev, "mutex unlocked"); + return 1; +} + +static ssize_t state_read(struct file *filp, struct kobject *kobj, + struct bin_attribute *bin_attr, char *buf, loff_t off, + size_t count) +{ + dev_dbg(&kobj_to_w1_slave(kobj)->dev, + "Reading %s kobj: %p, off: %0#10x, count: %zu, buff addr: %p", + bin_attr->attr.name, kobj, (unsigned int)off, count, buf); + if (count != 1 || off != 0) + return -EFAULT; + return _read_reg(kobj_to_w1_slave(kobj), W1_F29_REG_LOGIG_STATE, buf); +} + +static ssize_t output_read(struct file *filp, struct kobject *kobj, + struct bin_attribute *bin_attr, char *buf, + loff_t off, size_t count) +{ + dev_dbg(&kobj_to_w1_slave(kobj)->dev, + "Reading %s kobj: %p, off: %0#10x, count: %zu, buff addr: %p", + bin_attr->attr.name, kobj, (unsigned int)off, count, buf); + if (count != 1 || off != 0) + return -EFAULT; + return _read_reg(kobj_to_w1_slave(kobj), + W1_F29_REG_OUTPUT_LATCH_STATE, buf); +} + +static ssize_t activity_read(struct file *filp, struct kobject *kobj, + struct bin_attribute *bin_attr, char *buf, + loff_t off, size_t count) +{ + dev_dbg(&kobj_to_w1_slave(kobj)->dev, + "Reading %s kobj: %p, off: %0#10x, count: %zu, buff addr: %p", + bin_attr->attr.name, kobj, (unsigned int)off, count, buf); + if (count != 1 || off != 0) + return -EFAULT; + return _read_reg(kobj_to_w1_slave(kobj), + W1_F29_REG_ACTIVITY_LATCH_STATE, buf); +} + +static ssize_t cond_search_mask_read(struct file *filp, struct kobject *kobj, + struct bin_attribute *bin_attr, char *buf, + loff_t off, size_t count) +{ + dev_dbg(&kobj_to_w1_slave(kobj)->dev, + "Reading %s kobj: %p, off: %0#10x, count: %zu, buff addr: %p", + bin_attr->attr.name, kobj, (unsigned int)off, count, buf); + if (count != 1 || off != 0) + return -EFAULT; + return _read_reg(kobj_to_w1_slave(kobj), + W1_F29_REG_COND_SEARCH_SELECT_MASK, buf); +} + +static ssize_t cond_search_polarity_read(struct file *filp, + struct kobject *kobj, + struct bin_attribute *bin_attr, + char *buf, loff_t off, size_t count) +{ + if (count != 1 || off != 0) + return -EFAULT; + return _read_reg(kobj_to_w1_slave(kobj), + W1_F29_REG_COND_SEARCH_POL_SELECT, buf); +} + +static ssize_t status_control_read(struct file *filp, struct kobject *kobj, + struct bin_attribute *bin_attr, char *buf, + loff_t off, size_t count) +{ + if (count != 1 || off != 0) + return -EFAULT; + return _read_reg(kobj_to_w1_slave(kobj), + W1_F29_REG_CONTROL_AND_STATUS, buf); +} + +static ssize_t output_write(struct file *filp, struct kobject *kobj, + struct bin_attribute *bin_attr, char *buf, + loff_t off, size_t count) +{ + struct w1_slave *sl = kobj_to_w1_slave(kobj); + u8 w1_buf[3]; + u8 readBack; + unsigned int retries = W1_F29_RETRIES; + + if (count != 1 || off != 0) + return -EFAULT; + + dev_dbg(&sl->dev, "locking mutex for write_output"); + mutex_lock(&sl->master->bus_mutex); + dev_dbg(&sl->dev, "mutex locked"); + + if (w1_reset_select_slave(sl)) + goto error; + + while (retries--) { + w1_buf[0] = W1_F29_FUNC_CHANN_ACCESS_WRITE; + w1_buf[1] = *buf; + w1_buf[2] = ~(*buf); + w1_write_block(sl->master, w1_buf, 3); + + readBack = w1_read_8(sl->master); + + if (readBack != W1_F29_SUCCESS_CONFIRM_BYTE) { + if (w1_reset_resume_command(sl->master)) + goto error; + /* try again, the slave is ready for a command */ + continue; + } + +#ifdef CONFIG_W1_SLAVE_DS2408_READBACK + /* here the master could read another byte which + would be the PIO reg (the actual pin logic state) + since in this driver we don't know which pins are + in and outs, there's no value to read the state and + compare. with (*buf) so end this command abruptly: */ + if (w1_reset_resume_command(sl->master)) + goto error; + + /* go read back the output latches */ + /* (the direct effect of the write above) */ + w1_buf[0] = W1_F29_FUNC_READ_PIO_REGS; + w1_buf[1] = W1_F29_REG_OUTPUT_LATCH_STATE; + w1_buf[2] = 0; + w1_write_block(sl->master, w1_buf, 3); + /* read the result of the READ_PIO_REGS command */ + if (w1_read_8(sl->master) == *buf) +#endif + { + /* success! */ + mutex_unlock(&sl->master->bus_mutex); + dev_dbg(&sl->dev, + "mutex unlocked, retries:%d", retries); + return 1; + } + } +error: + mutex_unlock(&sl->master->bus_mutex); + dev_dbg(&sl->dev, "mutex unlocked in error, retries:%d", retries); + + return -EIO; +} + + +/** + * Writing to the activity file resets the activity latches. + */ +static ssize_t activity_write(struct file *filp, struct kobject *kobj, + struct bin_attribute *bin_attr, char *buf, + loff_t off, size_t count) +{ + struct w1_slave *sl = kobj_to_w1_slave(kobj); + unsigned int retries = W1_F29_RETRIES; + + if (count != 1 || off != 0) + return -EFAULT; + + mutex_lock(&sl->master->bus_mutex); + + if (w1_reset_select_slave(sl)) + goto error; + + while (retries--) { + w1_write_8(sl->master, W1_F29_FUNC_RESET_ACTIVITY_LATCHES); + if (w1_read_8(sl->master) == W1_F29_SUCCESS_CONFIRM_BYTE) { + mutex_unlock(&sl->master->bus_mutex); + return 1; + } + if (w1_reset_resume_command(sl->master)) + goto error; + } + +error: + mutex_unlock(&sl->master->bus_mutex); + return -EIO; +} + +static ssize_t status_control_write(struct file *filp, struct kobject *kobj, + struct bin_attribute *bin_attr, char *buf, + loff_t off, size_t count) +{ + struct w1_slave *sl = kobj_to_w1_slave(kobj); + u8 w1_buf[4]; + unsigned int retries = W1_F29_RETRIES; + + if (count != 1 || off != 0) + return -EFAULT; + + mutex_lock(&sl->master->bus_mutex); + + if (w1_reset_select_slave(sl)) + goto error; + + while (retries--) { + w1_buf[0] = W1_F29_FUNC_WRITE_COND_SEARCH_REG; + w1_buf[1] = W1_F29_REG_CONTROL_AND_STATUS; + w1_buf[2] = 0; + w1_buf[3] = *buf; + + w1_write_block(sl->master, w1_buf, 4); + if (w1_reset_resume_command(sl->master)) + goto error; + + w1_buf[0] = W1_F29_FUNC_READ_PIO_REGS; + w1_buf[1] = W1_F29_REG_CONTROL_AND_STATUS; + w1_buf[2] = 0; + + w1_write_block(sl->master, w1_buf, 3); + if (w1_read_8(sl->master) == *buf) { + /* success! */ + mutex_unlock(&sl->master->bus_mutex); + return 1; + } + } +error: + mutex_unlock(&sl->master->bus_mutex); + + return -EIO; +} + +/* + * This is a special sequence we must do to ensure the P0 output is not stuck + * in test mode. This is described in rev 2 of the ds2408's datasheet + * (http://datasheets.maximintegrated.com/en/ds/DS2408.pdf) under + * "APPLICATION INFORMATION/Power-up timing". + */ +static int w1_f29_disable_test_mode(struct w1_slave *sl) +{ + int res; + u8 magic[10] = {0x96, }; + u64 rn = le64_to_cpu(*((u64*)&sl->reg_num)); + + memcpy(&magic[1], &rn, 8); + magic[9] = 0x3C; + + mutex_lock(&sl->master->bus_mutex); + + res = w1_reset_bus(sl->master); + if (res) + goto out; + w1_write_block(sl->master, magic, ARRAY_SIZE(magic)); + + res = w1_reset_bus(sl->master); +out: + mutex_unlock(&sl->master->bus_mutex); + return res; +} + +static BIN_ATTR_RO(state, 1); +static BIN_ATTR_RW(output, 1); +static BIN_ATTR_RW(activity, 1); +static BIN_ATTR_RO(cond_search_mask, 1); +static BIN_ATTR_RO(cond_search_polarity, 1); +static BIN_ATTR_RW(status_control, 1); + +static struct bin_attribute *w1_f29_bin_attrs[] = { + &bin_attr_state, + &bin_attr_output, + &bin_attr_activity, + &bin_attr_cond_search_mask, + &bin_attr_cond_search_polarity, + &bin_attr_status_control, + NULL, +}; + +static const struct attribute_group w1_f29_group = { + .bin_attrs = w1_f29_bin_attrs, +}; + +static const struct attribute_group *w1_f29_groups[] = { + &w1_f29_group, + NULL, +}; + +static struct w1_family_ops w1_f29_fops = { + .add_slave = w1_f29_disable_test_mode, + .groups = w1_f29_groups, +}; + +static struct w1_family w1_family_29 = { + .fid = W1_FAMILY_DS2408, + .fops = &w1_f29_fops, +}; + +static int __init w1_f29_init(void) +{ + return w1_register_family(&w1_family_29); +} + +static void __exit w1_f29_exit(void) +{ + w1_unregister_family(&w1_family_29); +} + +module_init(w1_f29_init); +module_exit(w1_f29_exit); diff --git a/drivers/w1/slaves/w1_ds2413.c b/drivers/w1/slaves/w1_ds2413.c new file mode 100644 index 00000000000..ee28fc1ff39 --- /dev/null +++ b/drivers/w1/slaves/w1_ds2413.c @@ -0,0 +1,150 @@ +/* + * w1_ds2413.c - w1 family 3a (DS2413) driver + * based on w1_ds2408.c by Jean-Francois Dagenais <dagenaisj@sonatest.com> + * + * Copyright (c) 2013 Mariusz Bialonczyk <manio@skyboo.net> + * + * This source code is licensed under the GNU General Public License, + * Version 2. See the file COPYING for more details. + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/moduleparam.h> +#include <linux/device.h> +#include <linux/types.h> +#include <linux/delay.h> +#include <linux/slab.h> + +#include "../w1.h" +#include "../w1_int.h" +#include "../w1_family.h" + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Mariusz Bialonczyk <manio@skyboo.net>"); +MODULE_DESCRIPTION("w1 family 3a driver for DS2413 2 Pin IO"); +MODULE_ALIAS("w1-family-" __stringify(W1_FAMILY_DS2413)); + +#define W1_F3A_RETRIES 3 +#define W1_F3A_FUNC_PIO_ACCESS_READ 0xF5 +#define W1_F3A_FUNC_PIO_ACCESS_WRITE 0x5A +#define W1_F3A_SUCCESS_CONFIRM_BYTE 0xAA + +static ssize_t state_read(struct file *filp, struct kobject *kobj, + struct bin_attribute *bin_attr, char *buf, loff_t off, + size_t count) +{ + struct w1_slave *sl = kobj_to_w1_slave(kobj); + dev_dbg(&sl->dev, + "Reading %s kobj: %p, off: %0#10x, count: %zu, buff addr: %p", + bin_attr->attr.name, kobj, (unsigned int)off, count, buf); + + if (off != 0) + return 0; + if (!buf) + return -EINVAL; + + mutex_lock(&sl->master->bus_mutex); + dev_dbg(&sl->dev, "mutex locked"); + + if (w1_reset_select_slave(sl)) { + mutex_unlock(&sl->master->bus_mutex); + return -EIO; + } + + w1_write_8(sl->master, W1_F3A_FUNC_PIO_ACCESS_READ); + *buf = w1_read_8(sl->master); + + mutex_unlock(&sl->master->bus_mutex); + dev_dbg(&sl->dev, "mutex unlocked"); + + /* check for correct complement */ + if ((*buf & 0x0F) != ((~*buf >> 4) & 0x0F)) + return -EIO; + else + return 1; +} + +static BIN_ATTR_RO(state, 1); + +static ssize_t output_write(struct file *filp, struct kobject *kobj, + struct bin_attribute *bin_attr, char *buf, + loff_t off, size_t count) +{ + struct w1_slave *sl = kobj_to_w1_slave(kobj); + u8 w1_buf[3]; + unsigned int retries = W1_F3A_RETRIES; + + if (count != 1 || off != 0) + return -EFAULT; + + dev_dbg(&sl->dev, "locking mutex for write_output"); + mutex_lock(&sl->master->bus_mutex); + dev_dbg(&sl->dev, "mutex locked"); + + if (w1_reset_select_slave(sl)) + goto error; + + /* according to the DS2413 datasheet the most significant 6 bits + should be set to "1"s, so do it now */ + *buf = *buf | 0xFC; + + while (retries--) { + w1_buf[0] = W1_F3A_FUNC_PIO_ACCESS_WRITE; + w1_buf[1] = *buf; + w1_buf[2] = ~(*buf); + w1_write_block(sl->master, w1_buf, 3); + + if (w1_read_8(sl->master) == W1_F3A_SUCCESS_CONFIRM_BYTE) { + mutex_unlock(&sl->master->bus_mutex); + dev_dbg(&sl->dev, "mutex unlocked, retries:%d", retries); + return 1; + } + if (w1_reset_resume_command(sl->master)) + goto error; + } + +error: + mutex_unlock(&sl->master->bus_mutex); + dev_dbg(&sl->dev, "mutex unlocked in error, retries:%d", retries); + return -EIO; +} + +static BIN_ATTR(output, S_IRUGO | S_IWUSR | S_IWGRP, NULL, output_write, 1); + +static struct bin_attribute *w1_f3a_bin_attrs[] = { + &bin_attr_state, + &bin_attr_output, + NULL, +}; + +static const struct attribute_group w1_f3a_group = { + .bin_attrs = w1_f3a_bin_attrs, +}; + +static const struct attribute_group *w1_f3a_groups[] = { + &w1_f3a_group, + NULL, +}; + +static struct w1_family_ops w1_f3a_fops = { + .groups = w1_f3a_groups, +}; + +static struct w1_family w1_family_3a = { + .fid = W1_FAMILY_DS2413, + .fops = &w1_f3a_fops, +}; + +static int __init w1_f3a_init(void) +{ + return w1_register_family(&w1_family_3a); +} + +static void __exit w1_f3a_exit(void) +{ + w1_unregister_family(&w1_family_3a); +} + +module_init(w1_f3a_init); +module_exit(w1_f3a_exit); diff --git a/drivers/w1/slaves/w1_ds2423.c b/drivers/w1/slaves/w1_ds2423.c new file mode 100644 index 00000000000..7e41b7d91fb --- /dev/null +++ b/drivers/w1/slaves/w1_ds2423.c @@ -0,0 +1,158 @@ +/* + * w1_ds2423.c + * + * Copyright (c) 2010 Mika Laitio <lamikr@pilppa.org> + * + * This driver will read and write the value of 4 counters to w1_slave file in + * sys filesystem. + * Inspired by the w1_therm and w1_ds2431 drivers. + * + * This program is free software; you can redistribute it and/or modify + * it under the therms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/moduleparam.h> +#include <linux/device.h> +#include <linux/types.h> +#include <linux/delay.h> +#include <linux/crc16.h> + +#include "../w1.h" +#include "../w1_int.h" +#include "../w1_family.h" + +#define CRC16_VALID 0xb001 +#define CRC16_INIT 0 + +#define COUNTER_COUNT 4 +#define READ_BYTE_COUNT 42 + +static ssize_t w1_slave_show(struct device *device, + struct device_attribute *attr, char *out_buf) +{ + struct w1_slave *sl = dev_to_w1_slave(device); + struct w1_master *dev = sl->master; + u8 rbuf[COUNTER_COUNT * READ_BYTE_COUNT]; + u8 wrbuf[3]; + int rom_addr; + int read_byte_count; + int result; + ssize_t c; + int ii; + int p; + int crc; + + c = PAGE_SIZE; + rom_addr = (12 << 5) + 31; + wrbuf[0] = 0xA5; + wrbuf[1] = rom_addr & 0xFF; + wrbuf[2] = rom_addr >> 8; + mutex_lock(&dev->bus_mutex); + if (!w1_reset_select_slave(sl)) { + w1_write_block(dev, wrbuf, 3); + read_byte_count = 0; + for (p = 0; p < 4; p++) { + /* + * 1 byte for first bytes in ram page read + * 4 bytes for counter + * 4 bytes for zero bits + * 2 bytes for crc + * 31 remaining bytes from the ram page + */ + read_byte_count += w1_read_block(dev, + rbuf + (p * READ_BYTE_COUNT), READ_BYTE_COUNT); + for (ii = 0; ii < READ_BYTE_COUNT; ++ii) + c -= snprintf(out_buf + PAGE_SIZE - c, + c, "%02x ", + rbuf[(p * READ_BYTE_COUNT) + ii]); + if (read_byte_count != (p + 1) * READ_BYTE_COUNT) { + dev_warn(device, + "w1_counter_read() returned %u bytes " + "instead of %d bytes wanted.\n", + read_byte_count, + READ_BYTE_COUNT); + c -= snprintf(out_buf + PAGE_SIZE - c, + c, "crc=NO\n"); + } else { + if (p == 0) { + crc = crc16(CRC16_INIT, wrbuf, 3); + crc = crc16(crc, rbuf, 11); + } else { + /* + * DS2423 calculates crc from all bytes + * read after the previous crc bytes. + */ + crc = crc16(CRC16_INIT, + (rbuf + 11) + + ((p - 1) * READ_BYTE_COUNT), + READ_BYTE_COUNT); + } + if (crc == CRC16_VALID) { + result = 0; + for (ii = 4; ii > 0; ii--) { + result <<= 8; + result |= rbuf[(p * + READ_BYTE_COUNT) + ii]; + } + c -= snprintf(out_buf + PAGE_SIZE - c, + c, "crc=YES c=%d\n", result); + } else { + c -= snprintf(out_buf + PAGE_SIZE - c, + c, "crc=NO\n"); + } + } + } + } else { + c -= snprintf(out_buf + PAGE_SIZE - c, c, "Connection error"); + } + mutex_unlock(&dev->bus_mutex); + return PAGE_SIZE - c; +} + +static DEVICE_ATTR_RO(w1_slave); + +static struct attribute *w1_f1d_attrs[] = { + &dev_attr_w1_slave.attr, + NULL, +}; +ATTRIBUTE_GROUPS(w1_f1d); + +static struct w1_family_ops w1_f1d_fops = { + .groups = w1_f1d_groups, +}; + +static struct w1_family w1_family_1d = { + .fid = W1_COUNTER_DS2423, + .fops = &w1_f1d_fops, +}; + +static int __init w1_f1d_init(void) +{ + return w1_register_family(&w1_family_1d); +} + +static void __exit w1_f1d_exit(void) +{ + w1_unregister_family(&w1_family_1d); +} + +module_init(w1_f1d_init); +module_exit(w1_f1d_exit); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Mika Laitio <lamikr@pilppa.org>"); +MODULE_DESCRIPTION("w1 family 1d driver for DS2423, 4 counters and 4kb ram"); +MODULE_ALIAS("w1-family-" __stringify(W1_COUNTER_DS2423)); diff --git a/drivers/w1/slaves/w1_ds2431.c b/drivers/w1/slaves/w1_ds2431.c new file mode 100644 index 00000000000..9c4ff9d28ad --- /dev/null +++ b/drivers/w1/slaves/w1_ds2431.c @@ -0,0 +1,308 @@ +/* + * w1_ds2431.c - w1 family 2d (DS2431) driver + * + * Copyright (c) 2008 Bernhard Weirich <bernhard.weirich@riedel.net> + * + * Heavily inspired by w1_DS2433 driver from Ben Gardner <bgardner@wabtec.com> + * + * This source code is licensed under the GNU General Public License, + * Version 2. See the file COPYING for more details. + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/moduleparam.h> +#include <linux/device.h> +#include <linux/types.h> +#include <linux/delay.h> + +#include "../w1.h" +#include "../w1_int.h" +#include "../w1_family.h" + +#define W1_F2D_EEPROM_SIZE 128 +#define W1_F2D_PAGE_COUNT 4 +#define W1_F2D_PAGE_BITS 5 +#define W1_F2D_PAGE_SIZE (1<<W1_F2D_PAGE_BITS) +#define W1_F2D_PAGE_MASK 0x1F + +#define W1_F2D_SCRATCH_BITS 3 +#define W1_F2D_SCRATCH_SIZE (1<<W1_F2D_SCRATCH_BITS) +#define W1_F2D_SCRATCH_MASK (W1_F2D_SCRATCH_SIZE-1) + +#define W1_F2D_READ_EEPROM 0xF0 +#define W1_F2D_WRITE_SCRATCH 0x0F +#define W1_F2D_READ_SCRATCH 0xAA +#define W1_F2D_COPY_SCRATCH 0x55 + + +#define W1_F2D_TPROG_MS 11 + +#define W1_F2D_READ_RETRIES 10 +#define W1_F2D_READ_MAXLEN 8 + +/* + * Check the file size bounds and adjusts count as needed. + * This would not be needed if the file size didn't reset to 0 after a write. + */ +static inline size_t w1_f2d_fix_count(loff_t off, size_t count, size_t size) +{ + if (off > size) + return 0; + + if ((off + count) > size) + return size - off; + + return count; +} + +/* + * Read a block from W1 ROM two times and compares the results. + * If they are equal they are returned, otherwise the read + * is repeated W1_F2D_READ_RETRIES times. + * + * count must not exceed W1_F2D_READ_MAXLEN. + */ +static int w1_f2d_readblock(struct w1_slave *sl, int off, int count, char *buf) +{ + u8 wrbuf[3]; + u8 cmp[W1_F2D_READ_MAXLEN]; + int tries = W1_F2D_READ_RETRIES; + + do { + wrbuf[0] = W1_F2D_READ_EEPROM; + wrbuf[1] = off & 0xff; + wrbuf[2] = off >> 8; + + if (w1_reset_select_slave(sl)) + return -1; + + w1_write_block(sl->master, wrbuf, 3); + w1_read_block(sl->master, buf, count); + + if (w1_reset_select_slave(sl)) + return -1; + + w1_write_block(sl->master, wrbuf, 3); + w1_read_block(sl->master, cmp, count); + + if (!memcmp(cmp, buf, count)) + return 0; + } while (--tries); + + dev_err(&sl->dev, "proof reading failed %d times\n", + W1_F2D_READ_RETRIES); + + return -1; +} + +static ssize_t eeprom_read(struct file *filp, struct kobject *kobj, + struct bin_attribute *bin_attr, char *buf, + loff_t off, size_t count) +{ + struct w1_slave *sl = kobj_to_w1_slave(kobj); + int todo = count; + + count = w1_f2d_fix_count(off, count, W1_F2D_EEPROM_SIZE); + if (count == 0) + return 0; + + mutex_lock(&sl->master->bus_mutex); + + /* read directly from the EEPROM in chunks of W1_F2D_READ_MAXLEN */ + while (todo > 0) { + int block_read; + + if (todo >= W1_F2D_READ_MAXLEN) + block_read = W1_F2D_READ_MAXLEN; + else + block_read = todo; + + if (w1_f2d_readblock(sl, off, block_read, buf) < 0) + count = -EIO; + + todo -= W1_F2D_READ_MAXLEN; + buf += W1_F2D_READ_MAXLEN; + off += W1_F2D_READ_MAXLEN; + } + + mutex_unlock(&sl->master->bus_mutex); + + return count; +} + +/* + * Writes to the scratchpad and reads it back for verification. + * Then copies the scratchpad to EEPROM. + * The data must be aligned at W1_F2D_SCRATCH_SIZE bytes and + * must be W1_F2D_SCRATCH_SIZE bytes long. + * The master must be locked. + * + * @param sl The slave structure + * @param addr Address for the write + * @param len length must be <= (W1_F2D_PAGE_SIZE - (addr & W1_F2D_PAGE_MASK)) + * @param data The data to write + * @return 0=Success -1=failure + */ +static int w1_f2d_write(struct w1_slave *sl, int addr, int len, const u8 *data) +{ + int tries = W1_F2D_READ_RETRIES; + u8 wrbuf[4]; + u8 rdbuf[W1_F2D_SCRATCH_SIZE + 3]; + u8 es = (addr + len - 1) % W1_F2D_SCRATCH_SIZE; + +retry: + + /* Write the data to the scratchpad */ + if (w1_reset_select_slave(sl)) + return -1; + + wrbuf[0] = W1_F2D_WRITE_SCRATCH; + wrbuf[1] = addr & 0xff; + wrbuf[2] = addr >> 8; + + w1_write_block(sl->master, wrbuf, 3); + w1_write_block(sl->master, data, len); + + /* Read the scratchpad and verify */ + if (w1_reset_select_slave(sl)) + return -1; + + w1_write_8(sl->master, W1_F2D_READ_SCRATCH); + w1_read_block(sl->master, rdbuf, len + 3); + + /* Compare what was read against the data written */ + if ((rdbuf[0] != wrbuf[1]) || (rdbuf[1] != wrbuf[2]) || + (rdbuf[2] != es) || (memcmp(data, &rdbuf[3], len) != 0)) { + + if (--tries) + goto retry; + + dev_err(&sl->dev, + "could not write to eeprom, scratchpad compare failed %d times\n", + W1_F2D_READ_RETRIES); + + return -1; + } + + /* Copy the scratchpad to EEPROM */ + if (w1_reset_select_slave(sl)) + return -1; + + wrbuf[0] = W1_F2D_COPY_SCRATCH; + wrbuf[3] = es; + w1_write_block(sl->master, wrbuf, 4); + + /* Sleep for tprog ms to wait for the write to complete */ + msleep(W1_F2D_TPROG_MS); + + /* Reset the bus to wake up the EEPROM */ + w1_reset_bus(sl->master); + + return 0; +} + +static ssize_t eeprom_write(struct file *filp, struct kobject *kobj, + struct bin_attribute *bin_attr, char *buf, + loff_t off, size_t count) +{ + struct w1_slave *sl = kobj_to_w1_slave(kobj); + int addr, len; + int copy; + + count = w1_f2d_fix_count(off, count, W1_F2D_EEPROM_SIZE); + if (count == 0) + return 0; + + mutex_lock(&sl->master->bus_mutex); + + /* Can only write data in blocks of the size of the scratchpad */ + addr = off; + len = count; + while (len > 0) { + + /* if len too short or addr not aligned */ + if (len < W1_F2D_SCRATCH_SIZE || addr & W1_F2D_SCRATCH_MASK) { + char tmp[W1_F2D_SCRATCH_SIZE]; + + /* read the block and update the parts to be written */ + if (w1_f2d_readblock(sl, addr & ~W1_F2D_SCRATCH_MASK, + W1_F2D_SCRATCH_SIZE, tmp)) { + count = -EIO; + goto out_up; + } + + /* copy at most to the boundary of the PAGE or len */ + copy = W1_F2D_SCRATCH_SIZE - + (addr & W1_F2D_SCRATCH_MASK); + + if (copy > len) + copy = len; + + memcpy(&tmp[addr & W1_F2D_SCRATCH_MASK], buf, copy); + if (w1_f2d_write(sl, addr & ~W1_F2D_SCRATCH_MASK, + W1_F2D_SCRATCH_SIZE, tmp) < 0) { + count = -EIO; + goto out_up; + } + } else { + + copy = W1_F2D_SCRATCH_SIZE; + if (w1_f2d_write(sl, addr, copy, buf) < 0) { + count = -EIO; + goto out_up; + } + } + buf += copy; + addr += copy; + len -= copy; + } + +out_up: + mutex_unlock(&sl->master->bus_mutex); + + return count; +} + +static BIN_ATTR_RW(eeprom, W1_F2D_EEPROM_SIZE); + +static struct bin_attribute *w1_f2d_bin_attrs[] = { + &bin_attr_eeprom, + NULL, +}; + +static const struct attribute_group w1_f2d_group = { + .bin_attrs = w1_f2d_bin_attrs, +}; + +static const struct attribute_group *w1_f2d_groups[] = { + &w1_f2d_group, + NULL, +}; + +static struct w1_family_ops w1_f2d_fops = { + .groups = w1_f2d_groups, +}; + +static struct w1_family w1_family_2d = { + .fid = W1_EEPROM_DS2431, + .fops = &w1_f2d_fops, +}; + +static int __init w1_f2d_init(void) +{ + return w1_register_family(&w1_family_2d); +} + +static void __exit w1_f2d_fini(void) +{ + w1_unregister_family(&w1_family_2d); +} + +module_init(w1_f2d_init); +module_exit(w1_f2d_fini); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Bernhard Weirich <bernhard.weirich@riedel.net>"); +MODULE_DESCRIPTION("w1 family 2d driver for DS2431, 1kb EEPROM"); +MODULE_ALIAS("w1-family-" __stringify(W1_EEPROM_DS2431)); diff --git a/drivers/w1/slaves/w1_ds2433.c b/drivers/w1/slaves/w1_ds2433.c index 858c16a544c..72319a968a9 100644 --- a/drivers/w1/slaves/w1_ds2433.c +++ b/drivers/w1/slaves/w1_ds2433.c @@ -13,6 +13,7 @@ #include <linux/device.h> #include <linux/types.h> #include <linux/delay.h> +#include <linux/slab.h> #ifdef CONFIG_W1_SLAVE_DS2433_CRC #include <linux/crc16.h> @@ -28,6 +29,7 @@ MODULE_LICENSE("GPL"); MODULE_AUTHOR("Ben Gardner <bgardner@wabtec.com>"); MODULE_DESCRIPTION("w1 family 23 driver for DS2433, 4kb EEPROM"); +MODULE_ALIAS("w1-family-" __stringify(W1_EEPROM_DS2433)); #define W1_EEPROM_SIZE 512 #define W1_PAGE_COUNT 16 @@ -91,9 +93,9 @@ static int w1_f23_refresh_block(struct w1_slave *sl, struct w1_f23_data *data, } #endif /* CONFIG_W1_SLAVE_DS2433_CRC */ -static ssize_t w1_f23_read_bin(struct kobject *kobj, - struct bin_attribute *bin_attr, - char *buf, loff_t off, size_t count) +static ssize_t eeprom_read(struct file *filp, struct kobject *kobj, + struct bin_attribute *bin_attr, char *buf, + loff_t off, size_t count) { struct w1_slave *sl = kobj_to_w1_slave(kobj); #ifdef CONFIG_W1_SLAVE_DS2433_CRC @@ -106,7 +108,7 @@ static ssize_t w1_f23_read_bin(struct kobject *kobj, if ((count = w1_f23_fix_count(off, count, W1_EEPROM_SIZE)) == 0) return 0; - mutex_lock(&sl->master->mutex); + mutex_lock(&sl->master->bus_mutex); #ifdef CONFIG_W1_SLAVE_DS2433_CRC @@ -137,7 +139,7 @@ static ssize_t w1_f23_read_bin(struct kobject *kobj, #endif /* CONFIG_W1_SLAVE_DS2433_CRC */ out_up: - mutex_unlock(&sl->master->mutex); + mutex_unlock(&sl->master->bus_mutex); return count; } @@ -156,6 +158,9 @@ out_up: */ static int w1_f23_write(struct w1_slave *sl, int addr, int len, const u8 *data) { +#ifdef CONFIG_W1_SLAVE_DS2433_CRC + struct w1_f23_data *f23 = sl->family_data; +#endif u8 wrbuf[4]; u8 rdbuf[W1_PAGE_SIZE + 3]; u8 es = (addr + len - 1) & 0x1f; @@ -196,13 +201,15 @@ static int w1_f23_write(struct w1_slave *sl, int addr, int len, const u8 *data) /* Reset the bus to wake up the EEPROM (this may not be needed) */ w1_reset_bus(sl->master); - +#ifdef CONFIG_W1_SLAVE_DS2433_CRC + f23->validcrc &= ~(1 << (addr >> W1_PAGE_BITS)); +#endif return 0; } -static ssize_t w1_f23_write_bin(struct kobject *kobj, - struct bin_attribute *bin_attr, - char *buf, loff_t off, size_t count) +static ssize_t eeprom_write(struct file *filp, struct kobject *kobj, + struct bin_attribute *bin_attr, char *buf, + loff_t off, size_t count) { struct w1_slave *sl = kobj_to_w1_slave(kobj); int addr, len, idx; @@ -227,7 +234,7 @@ static ssize_t w1_f23_write_bin(struct kobject *kobj, } #endif /* CONFIG_W1_SLAVE_DS2433_CRC */ - mutex_lock(&sl->master->mutex); + mutex_lock(&sl->master->bus_mutex); /* Can only write data to one page at a time */ idx = 0; @@ -245,24 +252,29 @@ static ssize_t w1_f23_write_bin(struct kobject *kobj, } out_up: - mutex_unlock(&sl->master->mutex); + mutex_unlock(&sl->master->bus_mutex); return count; } -static struct bin_attribute w1_f23_bin_attr = { - .attr = { - .name = "eeprom", - .mode = S_IRUGO | S_IWUSR, - }, - .size = W1_EEPROM_SIZE, - .read = w1_f23_read_bin, - .write = w1_f23_write_bin, +static BIN_ATTR_RW(eeprom, W1_EEPROM_SIZE); + +static struct bin_attribute *w1_f23_bin_attributes[] = { + &bin_attr_eeprom, + NULL, +}; + +static const struct attribute_group w1_f23_group = { + .bin_attrs = w1_f23_bin_attributes, +}; + +static const struct attribute_group *w1_f23_groups[] = { + &w1_f23_group, + NULL, }; static int w1_f23_add_slave(struct w1_slave *sl) { - int err; #ifdef CONFIG_W1_SLAVE_DS2433_CRC struct w1_f23_data *data; @@ -272,15 +284,7 @@ static int w1_f23_add_slave(struct w1_slave *sl) sl->family_data = data; #endif /* CONFIG_W1_SLAVE_DS2433_CRC */ - - err = sysfs_create_bin_file(&sl->dev.kobj, &w1_f23_bin_attr); - -#ifdef CONFIG_W1_SLAVE_DS2433_CRC - if (err) - kfree(data); -#endif /* CONFIG_W1_SLAVE_DS2433_CRC */ - - return err; + return 0; } static void w1_f23_remove_slave(struct w1_slave *sl) @@ -289,12 +293,12 @@ static void w1_f23_remove_slave(struct w1_slave *sl) kfree(sl->family_data); sl->family_data = NULL; #endif /* CONFIG_W1_SLAVE_DS2433_CRC */ - sysfs_remove_bin_file(&sl->dev.kobj, &w1_f23_bin_attr); } static struct w1_family_ops w1_f23_fops = { .add_slave = w1_f23_add_slave, .remove_slave = w1_f23_remove_slave, + .groups = w1_f23_groups, }; static struct w1_family w1_family_23 = { diff --git a/drivers/w1/slaves/w1_ds2760.c b/drivers/w1/slaves/w1_ds2760.c index ed6b0576208..65f90dccd60 100644 --- a/drivers/w1/slaves/w1_ds2760.c +++ b/drivers/w1/slaves/w1_ds2760.c @@ -16,6 +16,7 @@ #include <linux/platform_device.h> #include <linux/mutex.h> #include <linux/idr.h> +#include <linux/gfp.h> #include "../w1.h" #include "../w1_int.h" @@ -30,7 +31,7 @@ static int w1_ds2760_io(struct device *dev, char *buf, int addr, size_t count, if (!dev) return 0; - mutex_lock(&sl->master->mutex); + mutex_lock(&sl->master->bus_mutex); if (addr > DS2760_DATA_SIZE || addr < 0) { count = 0; @@ -53,7 +54,7 @@ static int w1_ds2760_io(struct device *dev, char *buf, int addr, size_t count, } out: - mutex_unlock(&sl->master->mutex); + mutex_unlock(&sl->master->bus_mutex); return count; } @@ -68,69 +69,67 @@ int w1_ds2760_write(struct device *dev, char *buf, int addr, size_t count) return w1_ds2760_io(dev, buf, addr, count, 1); } -static ssize_t w1_ds2760_read_bin(struct kobject *kobj, - struct bin_attribute *bin_attr, - char *buf, loff_t off, size_t count) +static int w1_ds2760_eeprom_cmd(struct device *dev, int addr, int cmd) { - struct device *dev = container_of(kobj, struct device, kobj); - return w1_ds2760_read(dev, buf, off, count); -} - -static struct bin_attribute w1_ds2760_bin_attr = { - .attr = { - .name = "w1_slave", - .mode = S_IRUGO, - .owner = THIS_MODULE, - }, - .size = DS2760_DATA_SIZE, - .read = w1_ds2760_read_bin, -}; - -static DEFINE_IDR(bat_idr); -static DEFINE_MUTEX(bat_idr_lock); + struct w1_slave *sl = container_of(dev, struct w1_slave, dev); -static int new_bat_id(void) -{ - int ret; + if (!dev) + return -EINVAL; - while (1) { - int id; + mutex_lock(&sl->master->bus_mutex); - ret = idr_pre_get(&bat_idr, GFP_KERNEL); - if (ret == 0) - return -ENOMEM; + if (w1_reset_select_slave(sl) == 0) { + w1_write_8(sl->master, cmd); + w1_write_8(sl->master, addr); + } - mutex_lock(&bat_idr_lock); - ret = idr_get_new(&bat_idr, NULL, &id); - mutex_unlock(&bat_idr_lock); + mutex_unlock(&sl->master->bus_mutex); + return 0; +} - if (ret == 0) { - ret = id & MAX_ID_MASK; - break; - } else if (ret == -EAGAIN) { - continue; - } else { - break; - } - } +int w1_ds2760_store_eeprom(struct device *dev, int addr) +{ + return w1_ds2760_eeprom_cmd(dev, addr, W1_DS2760_COPY_DATA); +} - return ret; +int w1_ds2760_recall_eeprom(struct device *dev, int addr) +{ + return w1_ds2760_eeprom_cmd(dev, addr, W1_DS2760_RECALL_DATA); } -static void release_bat_id(int id) +static ssize_t w1_slave_read(struct file *filp, struct kobject *kobj, + struct bin_attribute *bin_attr, char *buf, + loff_t off, size_t count) { - mutex_lock(&bat_idr_lock); - idr_remove(&bat_idr, id); - mutex_unlock(&bat_idr_lock); + struct device *dev = container_of(kobj, struct device, kobj); + return w1_ds2760_read(dev, buf, off, count); } +static BIN_ATTR_RO(w1_slave, DS2760_DATA_SIZE); + +static struct bin_attribute *w1_ds2760_bin_attrs[] = { + &bin_attr_w1_slave, + NULL, +}; + +static const struct attribute_group w1_ds2760_group = { + .bin_attrs = w1_ds2760_bin_attrs, +}; + +static const struct attribute_group *w1_ds2760_groups[] = { + &w1_ds2760_group, + NULL, +}; + +static DEFINE_IDA(bat_ida); + static int w1_ds2760_add_slave(struct w1_slave *sl) { int ret; int id; struct platform_device *pdev; - id = new_bat_id(); + id = ida_simple_get(&bat_ida, 0, 0, GFP_KERNEL); if (id < 0) { ret = id; goto noid; @@ -147,19 +146,14 @@ static int w1_ds2760_add_slave(struct w1_slave *sl) if (ret) goto pdev_add_failed; - ret = sysfs_create_bin_file(&sl->dev.kobj, &w1_ds2760_bin_attr); - if (ret) - goto bin_attr_failed; - dev_set_drvdata(&sl->dev, pdev); goto success; -bin_attr_failed: pdev_add_failed: - platform_device_unregister(pdev); + platform_device_put(pdev); pdev_alloc_failed: - release_bat_id(id); + ida_simple_remove(&bat_ida, id); noid: success: return ret; @@ -171,13 +165,13 @@ static void w1_ds2760_remove_slave(struct w1_slave *sl) int id = pdev->id; platform_device_unregister(pdev); - release_bat_id(id); - sysfs_remove_bin_file(&sl->dev.kobj, &w1_ds2760_bin_attr); + ida_simple_remove(&bat_ida, id); } static struct w1_family_ops w1_ds2760_fops = { .add_slave = w1_ds2760_add_slave, .remove_slave = w1_ds2760_remove_slave, + .groups = w1_ds2760_groups, }; static struct w1_family w1_ds2760_family = { @@ -189,18 +183,20 @@ static int __init w1_ds2760_init(void) { printk(KERN_INFO "1-Wire driver for the DS2760 battery monitor " " chip - (c) 2004-2005, Szabolcs Gyurko\n"); - idr_init(&bat_idr); + ida_init(&bat_ida); return w1_register_family(&w1_ds2760_family); } static void __exit w1_ds2760_exit(void) { w1_unregister_family(&w1_ds2760_family); - idr_destroy(&bat_idr); + ida_destroy(&bat_ida); } EXPORT_SYMBOL(w1_ds2760_read); EXPORT_SYMBOL(w1_ds2760_write); +EXPORT_SYMBOL(w1_ds2760_store_eeprom); +EXPORT_SYMBOL(w1_ds2760_recall_eeprom); module_init(w1_ds2760_init); module_exit(w1_ds2760_exit); @@ -208,3 +204,4 @@ module_exit(w1_ds2760_exit); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Szabolcs Gyurko <szabolcs.gyurko@tlt.hu>"); MODULE_DESCRIPTION("1-wire Driver Dallas 2760 battery monitor chip"); +MODULE_ALIAS("w1-family-" __stringify(W1_FAMILY_DS2760)); diff --git a/drivers/w1/slaves/w1_ds2760.h b/drivers/w1/slaves/w1_ds2760.h index f1302429cb0..58e77414156 100644 --- a/drivers/w1/slaves/w1_ds2760.h +++ b/drivers/w1/slaves/w1_ds2760.h @@ -25,6 +25,10 @@ #define DS2760_PROTECTION_REG 0x00 #define DS2760_STATUS_REG 0x01 + #define DS2760_STATUS_IE (1 << 2) + #define DS2760_STATUS_SWEN (1 << 3) + #define DS2760_STATUS_RNAOP (1 << 4) + #define DS2760_STATUS_PMOD (1 << 5) #define DS2760_EEPROM_REG 0x07 #define DS2760_SPECIAL_FEATURE_REG 0x08 #define DS2760_VOLTAGE_MSB 0x0c @@ -38,6 +42,7 @@ #define DS2760_EEPROM_BLOCK0 0x20 #define DS2760_ACTIVE_FULL 0x20 #define DS2760_EEPROM_BLOCK1 0x30 +#define DS2760_STATUS_WRITE_REG 0x31 #define DS2760_RATED_CAPACITY 0x32 #define DS2760_CURRENT_OFFSET_BIAS 0x33 #define DS2760_ACTIVE_EMPTY 0x3b @@ -46,5 +51,7 @@ extern int w1_ds2760_read(struct device *dev, char *buf, int addr, size_t count); extern int w1_ds2760_write(struct device *dev, char *buf, int addr, size_t count); +extern int w1_ds2760_store_eeprom(struct device *dev, int addr); +extern int w1_ds2760_recall_eeprom(struct device *dev, int addr); #endif /* !__w1_ds2760_h__ */ diff --git a/drivers/w1/slaves/w1_ds2780.c b/drivers/w1/slaves/w1_ds2780.c new file mode 100644 index 00000000000..50e85f7929d --- /dev/null +++ b/drivers/w1/slaves/w1_ds2780.c @@ -0,0 +1,191 @@ +/* + * 1-Wire implementation for the ds2780 chip + * + * Copyright (C) 2010 Indesign, LLC + * + * Author: Clifton Barnes <cabarnes@indesign-llc.com> + * + * Based on w1-ds2760 driver + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/device.h> +#include <linux/types.h> +#include <linux/platform_device.h> +#include <linux/mutex.h> +#include <linux/idr.h> + +#include "../w1.h" +#include "../w1_int.h" +#include "../w1_family.h" +#include "w1_ds2780.h" + +static int w1_ds2780_do_io(struct device *dev, char *buf, int addr, + size_t count, int io) +{ + struct w1_slave *sl = container_of(dev, struct w1_slave, dev); + + if (addr > DS2780_DATA_SIZE || addr < 0) + return 0; + + count = min_t(int, count, DS2780_DATA_SIZE - addr); + + if (w1_reset_select_slave(sl) == 0) { + if (io) { + w1_write_8(sl->master, W1_DS2780_WRITE_DATA); + w1_write_8(sl->master, addr); + w1_write_block(sl->master, buf, count); + } else { + w1_write_8(sl->master, W1_DS2780_READ_DATA); + w1_write_8(sl->master, addr); + count = w1_read_block(sl->master, buf, count); + } + } + + return count; +} + +int w1_ds2780_io(struct device *dev, char *buf, int addr, size_t count, + int io) +{ + struct w1_slave *sl = container_of(dev, struct w1_slave, dev); + int ret; + + if (!dev) + return -ENODEV; + + mutex_lock(&sl->master->bus_mutex); + + ret = w1_ds2780_do_io(dev, buf, addr, count, io); + + mutex_unlock(&sl->master->bus_mutex); + + return ret; +} +EXPORT_SYMBOL(w1_ds2780_io); + +int w1_ds2780_eeprom_cmd(struct device *dev, int addr, int cmd) +{ + struct w1_slave *sl = container_of(dev, struct w1_slave, dev); + + if (!dev) + return -EINVAL; + + mutex_lock(&sl->master->bus_mutex); + + if (w1_reset_select_slave(sl) == 0) { + w1_write_8(sl->master, cmd); + w1_write_8(sl->master, addr); + } + + mutex_unlock(&sl->master->bus_mutex); + return 0; +} +EXPORT_SYMBOL(w1_ds2780_eeprom_cmd); + +static ssize_t w1_slave_read(struct file *filp, struct kobject *kobj, + struct bin_attribute *bin_attr, char *buf, + loff_t off, size_t count) +{ + struct device *dev = container_of(kobj, struct device, kobj); + return w1_ds2780_io(dev, buf, off, count, 0); +} + +static BIN_ATTR_RO(w1_slave, DS2780_DATA_SIZE); + +static struct bin_attribute *w1_ds2780_bin_attrs[] = { + &bin_attr_w1_slave, + NULL, +}; + +static const struct attribute_group w1_ds2780_group = { + .bin_attrs = w1_ds2780_bin_attrs, +}; + +static const struct attribute_group *w1_ds2780_groups[] = { + &w1_ds2780_group, + NULL, +}; + +static DEFINE_IDA(bat_ida); + +static int w1_ds2780_add_slave(struct w1_slave *sl) +{ + int ret; + int id; + struct platform_device *pdev; + + id = ida_simple_get(&bat_ida, 0, 0, GFP_KERNEL); + if (id < 0) { + ret = id; + goto noid; + } + + pdev = platform_device_alloc("ds2780-battery", id); + if (!pdev) { + ret = -ENOMEM; + goto pdev_alloc_failed; + } + pdev->dev.parent = &sl->dev; + + ret = platform_device_add(pdev); + if (ret) + goto pdev_add_failed; + + dev_set_drvdata(&sl->dev, pdev); + + return 0; + +pdev_add_failed: + platform_device_put(pdev); +pdev_alloc_failed: + ida_simple_remove(&bat_ida, id); +noid: + return ret; +} + +static void w1_ds2780_remove_slave(struct w1_slave *sl) +{ + struct platform_device *pdev = dev_get_drvdata(&sl->dev); + int id = pdev->id; + + platform_device_unregister(pdev); + ida_simple_remove(&bat_ida, id); +} + +static struct w1_family_ops w1_ds2780_fops = { + .add_slave = w1_ds2780_add_slave, + .remove_slave = w1_ds2780_remove_slave, + .groups = w1_ds2780_groups, +}; + +static struct w1_family w1_ds2780_family = { + .fid = W1_FAMILY_DS2780, + .fops = &w1_ds2780_fops, +}; + +static int __init w1_ds2780_init(void) +{ + ida_init(&bat_ida); + return w1_register_family(&w1_ds2780_family); +} + +static void __exit w1_ds2780_exit(void) +{ + w1_unregister_family(&w1_ds2780_family); + ida_destroy(&bat_ida); +} + +module_init(w1_ds2780_init); +module_exit(w1_ds2780_exit); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Clifton Barnes <cabarnes@indesign-llc.com>"); +MODULE_DESCRIPTION("1-wire Driver for Maxim/Dallas DS2780 Stand-Alone Fuel Gauge IC"); +MODULE_ALIAS("w1-family-" __stringify(W1_FAMILY_DS2780)); diff --git a/drivers/w1/slaves/w1_ds2780.h b/drivers/w1/slaves/w1_ds2780.h new file mode 100644 index 00000000000..a1fba79eb1b --- /dev/null +++ b/drivers/w1/slaves/w1_ds2780.h @@ -0,0 +1,129 @@ +/* + * 1-Wire implementation for the ds2780 chip + * + * Copyright (C) 2010 Indesign, LLC + * + * Author: Clifton Barnes <cabarnes@indesign-llc.com> + * + * Based on w1-ds2760 driver + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + */ + +#ifndef _W1_DS2780_H +#define _W1_DS2780_H + +/* Function commands */ +#define W1_DS2780_READ_DATA 0x69 +#define W1_DS2780_WRITE_DATA 0x6C +#define W1_DS2780_COPY_DATA 0x48 +#define W1_DS2780_RECALL_DATA 0xB8 +#define W1_DS2780_LOCK 0x6A + +/* Register map */ +/* Register 0x00 Reserved */ +#define DS2780_STATUS_REG 0x01 +#define DS2780_RAAC_MSB_REG 0x02 +#define DS2780_RAAC_LSB_REG 0x03 +#define DS2780_RSAC_MSB_REG 0x04 +#define DS2780_RSAC_LSB_REG 0x05 +#define DS2780_RARC_REG 0x06 +#define DS2780_RSRC_REG 0x07 +#define DS2780_IAVG_MSB_REG 0x08 +#define DS2780_IAVG_LSB_REG 0x09 +#define DS2780_TEMP_MSB_REG 0x0A +#define DS2780_TEMP_LSB_REG 0x0B +#define DS2780_VOLT_MSB_REG 0x0C +#define DS2780_VOLT_LSB_REG 0x0D +#define DS2780_CURRENT_MSB_REG 0x0E +#define DS2780_CURRENT_LSB_REG 0x0F +#define DS2780_ACR_MSB_REG 0x10 +#define DS2780_ACR_LSB_REG 0x11 +#define DS2780_ACRL_MSB_REG 0x12 +#define DS2780_ACRL_LSB_REG 0x13 +#define DS2780_AS_REG 0x14 +#define DS2780_SFR_REG 0x15 +#define DS2780_FULL_MSB_REG 0x16 +#define DS2780_FULL_LSB_REG 0x17 +#define DS2780_AE_MSB_REG 0x18 +#define DS2780_AE_LSB_REG 0x19 +#define DS2780_SE_MSB_REG 0x1A +#define DS2780_SE_LSB_REG 0x1B +/* Register 0x1C - 0x1E Reserved */ +#define DS2780_EEPROM_REG 0x1F +#define DS2780_EEPROM_BLOCK0_START 0x20 +/* Register 0x20 - 0x2F User EEPROM */ +#define DS2780_EEPROM_BLOCK0_END 0x2F +/* Register 0x30 - 0x5F Reserved */ +#define DS2780_EEPROM_BLOCK1_START 0x60 +#define DS2780_CONTROL_REG 0x60 +#define DS2780_AB_REG 0x61 +#define DS2780_AC_MSB_REG 0x62 +#define DS2780_AC_LSB_REG 0x63 +#define DS2780_VCHG_REG 0x64 +#define DS2780_IMIN_REG 0x65 +#define DS2780_VAE_REG 0x66 +#define DS2780_IAE_REG 0x67 +#define DS2780_AE_40_REG 0x68 +#define DS2780_RSNSP_REG 0x69 +#define DS2780_FULL_40_MSB_REG 0x6A +#define DS2780_FULL_40_LSB_REG 0x6B +#define DS2780_FULL_3040_SLOPE_REG 0x6C +#define DS2780_FULL_2030_SLOPE_REG 0x6D +#define DS2780_FULL_1020_SLOPE_REG 0x6E +#define DS2780_FULL_0010_SLOPE_REG 0x6F +#define DS2780_AE_3040_SLOPE_REG 0x70 +#define DS2780_AE_2030_SLOPE_REG 0x71 +#define DS2780_AE_1020_SLOPE_REG 0x72 +#define DS2780_AE_0010_SLOPE_REG 0x73 +#define DS2780_SE_3040_SLOPE_REG 0x74 +#define DS2780_SE_2030_SLOPE_REG 0x75 +#define DS2780_SE_1020_SLOPE_REG 0x76 +#define DS2780_SE_0010_SLOPE_REG 0x77 +#define DS2780_RSGAIN_MSB_REG 0x78 +#define DS2780_RSGAIN_LSB_REG 0x79 +#define DS2780_RSTC_REG 0x7A +#define DS2780_FRSGAIN_MSB_REG 0x7B +#define DS2780_FRSGAIN_LSB_REG 0x7C +#define DS2780_EEPROM_BLOCK1_END 0x7C +/* Register 0x7D - 0xFF Reserved */ + +/* Number of valid register addresses */ +#define DS2780_DATA_SIZE 0x80 + +/* Status register bits */ +#define DS2780_STATUS_REG_CHGTF (1 << 7) +#define DS2780_STATUS_REG_AEF (1 << 6) +#define DS2780_STATUS_REG_SEF (1 << 5) +#define DS2780_STATUS_REG_LEARNF (1 << 4) +/* Bit 3 Reserved */ +#define DS2780_STATUS_REG_UVF (1 << 2) +#define DS2780_STATUS_REG_PORF (1 << 1) +/* Bit 0 Reserved */ + +/* Control register bits */ +/* Bit 7 Reserved */ +#define DS2780_CONTROL_REG_UVEN (1 << 6) +#define DS2780_CONTROL_REG_PMOD (1 << 5) +#define DS2780_CONTROL_REG_RNAOP (1 << 4) +/* Bit 0 - 3 Reserved */ + +/* Special feature register bits */ +/* Bit 1 - 7 Reserved */ +#define DS2780_SFR_REG_PIOSC (1 << 0) + +/* EEPROM register bits */ +#define DS2780_EEPROM_REG_EEC (1 << 7) +#define DS2780_EEPROM_REG_LOCK (1 << 6) +/* Bit 2 - 6 Reserved */ +#define DS2780_EEPROM_REG_BL1 (1 << 1) +#define DS2780_EEPROM_REG_BL0 (1 << 0) + +extern int w1_ds2780_io(struct device *dev, char *buf, int addr, size_t count, + int io); +extern int w1_ds2780_eeprom_cmd(struct device *dev, int addr, int cmd); + +#endif /* !_W1_DS2780_H */ diff --git a/drivers/w1/slaves/w1_ds2781.c b/drivers/w1/slaves/w1_ds2781.c new file mode 100644 index 00000000000..1eb98fb1688 --- /dev/null +++ b/drivers/w1/slaves/w1_ds2781.c @@ -0,0 +1,189 @@ +/* + * 1-Wire implementation for the ds2781 chip + * + * Author: Renata Sayakhova <renata@oktetlabs.ru> + * + * Based on w1-ds2780 driver + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/device.h> +#include <linux/types.h> +#include <linux/platform_device.h> +#include <linux/mutex.h> +#include <linux/idr.h> + +#include "../w1.h" +#include "../w1_int.h" +#include "../w1_family.h" +#include "w1_ds2781.h" + +static int w1_ds2781_do_io(struct device *dev, char *buf, int addr, + size_t count, int io) +{ + struct w1_slave *sl = container_of(dev, struct w1_slave, dev); + + if (addr > DS2781_DATA_SIZE || addr < 0) + return 0; + + count = min_t(int, count, DS2781_DATA_SIZE - addr); + + if (w1_reset_select_slave(sl) == 0) { + if (io) { + w1_write_8(sl->master, W1_DS2781_WRITE_DATA); + w1_write_8(sl->master, addr); + w1_write_block(sl->master, buf, count); + } else { + w1_write_8(sl->master, W1_DS2781_READ_DATA); + w1_write_8(sl->master, addr); + count = w1_read_block(sl->master, buf, count); + } + } + + return count; +} + +int w1_ds2781_io(struct device *dev, char *buf, int addr, size_t count, + int io) +{ + struct w1_slave *sl = container_of(dev, struct w1_slave, dev); + int ret; + + if (!dev) + return -ENODEV; + + mutex_lock(&sl->master->bus_mutex); + + ret = w1_ds2781_do_io(dev, buf, addr, count, io); + + mutex_unlock(&sl->master->bus_mutex); + + return ret; +} +EXPORT_SYMBOL(w1_ds2781_io); + +int w1_ds2781_eeprom_cmd(struct device *dev, int addr, int cmd) +{ + struct w1_slave *sl = container_of(dev, struct w1_slave, dev); + + if (!dev) + return -EINVAL; + + mutex_lock(&sl->master->bus_mutex); + + if (w1_reset_select_slave(sl) == 0) { + w1_write_8(sl->master, cmd); + w1_write_8(sl->master, addr); + } + + mutex_unlock(&sl->master->bus_mutex); + return 0; +} +EXPORT_SYMBOL(w1_ds2781_eeprom_cmd); + +static ssize_t w1_slave_read(struct file *filp, struct kobject *kobj, + struct bin_attribute *bin_attr, char *buf, + loff_t off, size_t count) +{ + struct device *dev = container_of(kobj, struct device, kobj); + return w1_ds2781_io(dev, buf, off, count, 0); +} + +static BIN_ATTR_RO(w1_slave, DS2781_DATA_SIZE); + +static struct bin_attribute *w1_ds2781_bin_attrs[] = { + &bin_attr_w1_slave, + NULL, +}; + +static const struct attribute_group w1_ds2781_group = { + .bin_attrs = w1_ds2781_bin_attrs, +}; + +static const struct attribute_group *w1_ds2781_groups[] = { + &w1_ds2781_group, + NULL, +}; + +static DEFINE_IDA(bat_ida); + +static int w1_ds2781_add_slave(struct w1_slave *sl) +{ + int ret; + int id; + struct platform_device *pdev; + + id = ida_simple_get(&bat_ida, 0, 0, GFP_KERNEL); + if (id < 0) { + ret = id; + goto noid; + } + + pdev = platform_device_alloc("ds2781-battery", id); + if (!pdev) { + ret = -ENOMEM; + goto pdev_alloc_failed; + } + pdev->dev.parent = &sl->dev; + + ret = platform_device_add(pdev); + if (ret) + goto pdev_add_failed; + + dev_set_drvdata(&sl->dev, pdev); + + return 0; + +pdev_add_failed: + platform_device_put(pdev); +pdev_alloc_failed: + ida_simple_remove(&bat_ida, id); +noid: + return ret; +} + +static void w1_ds2781_remove_slave(struct w1_slave *sl) +{ + struct platform_device *pdev = dev_get_drvdata(&sl->dev); + int id = pdev->id; + + platform_device_unregister(pdev); + ida_simple_remove(&bat_ida, id); +} + +static struct w1_family_ops w1_ds2781_fops = { + .add_slave = w1_ds2781_add_slave, + .remove_slave = w1_ds2781_remove_slave, + .groups = w1_ds2781_groups, +}; + +static struct w1_family w1_ds2781_family = { + .fid = W1_FAMILY_DS2781, + .fops = &w1_ds2781_fops, +}; + +static int __init w1_ds2781_init(void) +{ + ida_init(&bat_ida); + return w1_register_family(&w1_ds2781_family); +} + +static void __exit w1_ds2781_exit(void) +{ + w1_unregister_family(&w1_ds2781_family); + ida_destroy(&bat_ida); +} + +module_init(w1_ds2781_init); +module_exit(w1_ds2781_exit); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Renata Sayakhova <renata@oktetlabs.ru>"); +MODULE_DESCRIPTION("1-wire Driver for Maxim/Dallas DS2781 Stand-Alone Fuel Gauge IC"); +MODULE_ALIAS("w1-family-" __stringify(W1_FAMILY_DS2781)); diff --git a/drivers/w1/slaves/w1_ds2781.h b/drivers/w1/slaves/w1_ds2781.h new file mode 100644 index 00000000000..557dfb0b4f6 --- /dev/null +++ b/drivers/w1/slaves/w1_ds2781.h @@ -0,0 +1,134 @@ +/* + * 1-Wire implementation for the ds2780 chip + * + * Author: Renata Sayakhova <renata@oktetlabs.ru> + * + * Based on w1-ds2760 driver + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + */ + +#ifndef _W1_DS2781_H +#define _W1_DS2781_H + +/* Function commands */ +#define W1_DS2781_READ_DATA 0x69 +#define W1_DS2781_WRITE_DATA 0x6C +#define W1_DS2781_COPY_DATA 0x48 +#define W1_DS2781_RECALL_DATA 0xB8 +#define W1_DS2781_LOCK 0x6A + +/* Register map */ +/* Register 0x00 Reserved */ +#define DS2781_STATUS 0x01 +#define DS2781_RAAC_MSB 0x02 +#define DS2781_RAAC_LSB 0x03 +#define DS2781_RSAC_MSB 0x04 +#define DS2781_RSAC_LSB 0x05 +#define DS2781_RARC 0x06 +#define DS2781_RSRC 0x07 +#define DS2781_IAVG_MSB 0x08 +#define DS2781_IAVG_LSB 0x09 +#define DS2781_TEMP_MSB 0x0A +#define DS2781_TEMP_LSB 0x0B +#define DS2781_VOLT_MSB 0x0C +#define DS2781_VOLT_LSB 0x0D +#define DS2781_CURRENT_MSB 0x0E +#define DS2781_CURRENT_LSB 0x0F +#define DS2781_ACR_MSB 0x10 +#define DS2781_ACR_LSB 0x11 +#define DS2781_ACRL_MSB 0x12 +#define DS2781_ACRL_LSB 0x13 +#define DS2781_AS 0x14 +#define DS2781_SFR 0x15 +#define DS2781_FULL_MSB 0x16 +#define DS2781_FULL_LSB 0x17 +#define DS2781_AE_MSB 0x18 +#define DS2781_AE_LSB 0x19 +#define DS2781_SE_MSB 0x1A +#define DS2781_SE_LSB 0x1B +/* Register 0x1C - 0x1E Reserved */ +#define DS2781_EEPROM 0x1F +#define DS2781_EEPROM_BLOCK0_START 0x20 +/* Register 0x20 - 0x2F User EEPROM */ +#define DS2781_EEPROM_BLOCK0_END 0x2F +/* Register 0x30 - 0x5F Reserved */ +#define DS2781_EEPROM_BLOCK1_START 0x60 +#define DS2781_CONTROL 0x60 +#define DS2781_AB 0x61 +#define DS2781_AC_MSB 0x62 +#define DS2781_AC_LSB 0x63 +#define DS2781_VCHG 0x64 +#define DS2781_IMIN 0x65 +#define DS2781_VAE 0x66 +#define DS2781_IAE 0x67 +#define DS2781_AE_40 0x68 +#define DS2781_RSNSP 0x69 +#define DS2781_FULL_40_MSB 0x6A +#define DS2781_FULL_40_LSB 0x6B +#define DS2781_FULL_4_SLOPE 0x6C +#define DS2781_FULL_3_SLOPE 0x6D +#define DS2781_FULL_2_SLOPE 0x6E +#define DS2781_FULL_1_SLOPE 0x6F +#define DS2781_AE_4_SLOPE 0x70 +#define DS2781_AE_3_SLOPE 0x71 +#define DS2781_AE_2_SLOPE 0x72 +#define DS2781_AE_1_SLOPE 0x73 +#define DS2781_SE_4_SLOPE 0x74 +#define DS2781_SE_3_SLOPE 0x75 +#define DS2781_SE_2_SLOPE 0x76 +#define DS2781_SE_1_SLOPE 0x77 +#define DS2781_RSGAIN_MSB 0x78 +#define DS2781_RSGAIN_LSB 0x79 +#define DS2781_RSTC 0x7A +#define DS2781_COB 0x7B +#define DS2781_TBP34 0x7C +#define DS2781_TBP23 0x7D +#define DS2781_TBP12 0x7E +#define DS2781_EEPROM_BLOCK1_END 0x7F +/* Register 0x7D - 0xFF Reserved */ + +#define DS2781_FSGAIN_MSB 0xB0 +#define DS2781_FSGAIN_LSB 0xB1 + +/* Number of valid register addresses */ +#define DS2781_DATA_SIZE 0xB2 + +/* Status register bits */ +#define DS2781_STATUS_CHGTF (1 << 7) +#define DS2781_STATUS_AEF (1 << 6) +#define DS2781_STATUS_SEF (1 << 5) +#define DS2781_STATUS_LEARNF (1 << 4) +/* Bit 3 Reserved */ +#define DS2781_STATUS_UVF (1 << 2) +#define DS2781_STATUS_PORF (1 << 1) +/* Bit 0 Reserved */ + +/* Control register bits */ +/* Bit 7 Reserved */ +#define DS2781_CONTROL_NBEN (1 << 7) +#define DS2781_CONTROL_UVEN (1 << 6) +#define DS2781_CONTROL_PMOD (1 << 5) +#define DS2781_CONTROL_RNAOP (1 << 4) +#define DS1781_CONTROL_UVTH (1 << 3) +/* Bit 0 - 2 Reserved */ + +/* Special feature register bits */ +/* Bit 1 - 7 Reserved */ +#define DS2781_SFR_PIOSC (1 << 0) + +/* EEPROM register bits */ +#define DS2781_EEPROM_EEC (1 << 7) +#define DS2781_EEPROM_LOCK (1 << 6) +/* Bit 2 - 6 Reserved */ +#define DS2781_EEPROM_BL1 (1 << 1) +#define DS2781_EEPROM_BL0 (1 << 0) + +extern int w1_ds2781_io(struct device *dev, char *buf, int addr, size_t count, + int io); +extern int w1_ds2781_eeprom_cmd(struct device *dev, int addr, int cmd); + +#endif /* !_W1_DS2781_H */ diff --git a/drivers/w1/slaves/w1_ds28e04.c b/drivers/w1/slaves/w1_ds28e04.c new file mode 100644 index 00000000000..365d6dff21d --- /dev/null +++ b/drivers/w1/slaves/w1_ds28e04.c @@ -0,0 +1,442 @@ +/* + * w1_ds28e04.c - w1 family 1C (DS28E04) driver + * + * Copyright (c) 2012 Markus Franke <franke.m@sebakmt.com> + * + * This source code is licensed under the GNU General Public License, + * Version 2. See the file COPYING for more details. + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/moduleparam.h> +#include <linux/device.h> +#include <linux/types.h> +#include <linux/delay.h> +#include <linux/slab.h> +#include <linux/crc16.h> +#include <linux/uaccess.h> + +#define CRC16_INIT 0 +#define CRC16_VALID 0xb001 + +#include "../w1.h" +#include "../w1_int.h" +#include "../w1_family.h" + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Markus Franke <franke.m@sebakmt.com>, <franm@hrz.tu-chemnitz.de>"); +MODULE_DESCRIPTION("w1 family 1C driver for DS28E04, 4kb EEPROM and PIO"); +MODULE_ALIAS("w1-family-" __stringify(W1_FAMILY_DS28E04)); + +/* Allow the strong pullup to be disabled, but default to enabled. + * If it was disabled a parasite powered device might not get the required + * current to copy the data from the scratchpad to EEPROM. If it is enabled + * parasite powered devices have a better chance of getting the current + * required. + */ +static int w1_strong_pullup = 1; +module_param_named(strong_pullup, w1_strong_pullup, int, 0); + +/* enable/disable CRC checking on DS28E04-100 memory accesses */ +static char w1_enable_crccheck = 1; + +#define W1_EEPROM_SIZE 512 +#define W1_PAGE_COUNT 16 +#define W1_PAGE_SIZE 32 +#define W1_PAGE_BITS 5 +#define W1_PAGE_MASK 0x1F + +#define W1_F1C_READ_EEPROM 0xF0 +#define W1_F1C_WRITE_SCRATCH 0x0F +#define W1_F1C_READ_SCRATCH 0xAA +#define W1_F1C_COPY_SCRATCH 0x55 +#define W1_F1C_ACCESS_WRITE 0x5A + +#define W1_1C_REG_LOGIC_STATE 0x220 + +struct w1_f1C_data { + u8 memory[W1_EEPROM_SIZE]; + u32 validcrc; +}; + +/** + * Check the file size bounds and adjusts count as needed. + * This would not be needed if the file size didn't reset to 0 after a write. + */ +static inline size_t w1_f1C_fix_count(loff_t off, size_t count, size_t size) +{ + if (off > size) + return 0; + + if ((off + count) > size) + return size - off; + + return count; +} + +static int w1_f1C_refresh_block(struct w1_slave *sl, struct w1_f1C_data *data, + int block) +{ + u8 wrbuf[3]; + int off = block * W1_PAGE_SIZE; + + if (data->validcrc & (1 << block)) + return 0; + + if (w1_reset_select_slave(sl)) { + data->validcrc = 0; + return -EIO; + } + + wrbuf[0] = W1_F1C_READ_EEPROM; + wrbuf[1] = off & 0xff; + wrbuf[2] = off >> 8; + w1_write_block(sl->master, wrbuf, 3); + w1_read_block(sl->master, &data->memory[off], W1_PAGE_SIZE); + + /* cache the block if the CRC is valid */ + if (crc16(CRC16_INIT, &data->memory[off], W1_PAGE_SIZE) == CRC16_VALID) + data->validcrc |= (1 << block); + + return 0; +} + +static int w1_f1C_read(struct w1_slave *sl, int addr, int len, char *data) +{ + u8 wrbuf[3]; + + /* read directly from the EEPROM */ + if (w1_reset_select_slave(sl)) + return -EIO; + + wrbuf[0] = W1_F1C_READ_EEPROM; + wrbuf[1] = addr & 0xff; + wrbuf[2] = addr >> 8; + + w1_write_block(sl->master, wrbuf, sizeof(wrbuf)); + return w1_read_block(sl->master, data, len); +} + +static ssize_t eeprom_read(struct file *filp, struct kobject *kobj, + struct bin_attribute *bin_attr, char *buf, + loff_t off, size_t count) +{ + struct w1_slave *sl = kobj_to_w1_slave(kobj); + struct w1_f1C_data *data = sl->family_data; + int i, min_page, max_page; + + count = w1_f1C_fix_count(off, count, W1_EEPROM_SIZE); + if (count == 0) + return 0; + + mutex_lock(&sl->master->mutex); + + if (w1_enable_crccheck) { + min_page = (off >> W1_PAGE_BITS); + max_page = (off + count - 1) >> W1_PAGE_BITS; + for (i = min_page; i <= max_page; i++) { + if (w1_f1C_refresh_block(sl, data, i)) { + count = -EIO; + goto out_up; + } + } + memcpy(buf, &data->memory[off], count); + } else { + count = w1_f1C_read(sl, off, count, buf); + } + +out_up: + mutex_unlock(&sl->master->mutex); + + return count; +} + +/** + * Writes to the scratchpad and reads it back for verification. + * Then copies the scratchpad to EEPROM. + * The data must be on one page. + * The master must be locked. + * + * @param sl The slave structure + * @param addr Address for the write + * @param len length must be <= (W1_PAGE_SIZE - (addr & W1_PAGE_MASK)) + * @param data The data to write + * @return 0=Success -1=failure + */ +static int w1_f1C_write(struct w1_slave *sl, int addr, int len, const u8 *data) +{ + u8 wrbuf[4]; + u8 rdbuf[W1_PAGE_SIZE + 3]; + u8 es = (addr + len - 1) & 0x1f; + unsigned int tm = 10; + int i; + struct w1_f1C_data *f1C = sl->family_data; + + /* Write the data to the scratchpad */ + if (w1_reset_select_slave(sl)) + return -1; + + wrbuf[0] = W1_F1C_WRITE_SCRATCH; + wrbuf[1] = addr & 0xff; + wrbuf[2] = addr >> 8; + + w1_write_block(sl->master, wrbuf, 3); + w1_write_block(sl->master, data, len); + + /* Read the scratchpad and verify */ + if (w1_reset_select_slave(sl)) + return -1; + + w1_write_8(sl->master, W1_F1C_READ_SCRATCH); + w1_read_block(sl->master, rdbuf, len + 3); + + /* Compare what was read against the data written */ + if ((rdbuf[0] != wrbuf[1]) || (rdbuf[1] != wrbuf[2]) || + (rdbuf[2] != es) || (memcmp(data, &rdbuf[3], len) != 0)) + return -1; + + /* Copy the scratchpad to EEPROM */ + if (w1_reset_select_slave(sl)) + return -1; + + wrbuf[0] = W1_F1C_COPY_SCRATCH; + wrbuf[3] = es; + + for (i = 0; i < sizeof(wrbuf); ++i) { + /* issue 10ms strong pullup (or delay) on the last byte + for writing the data from the scratchpad to EEPROM */ + if (w1_strong_pullup && i == sizeof(wrbuf)-1) + w1_next_pullup(sl->master, tm); + + w1_write_8(sl->master, wrbuf[i]); + } + + if (!w1_strong_pullup) + msleep(tm); + + if (w1_enable_crccheck) { + /* invalidate cached data */ + f1C->validcrc &= ~(1 << (addr >> W1_PAGE_BITS)); + } + + /* Reset the bus to wake up the EEPROM (this may not be needed) */ + w1_reset_bus(sl->master); + + return 0; +} + +static ssize_t eeprom_write(struct file *filp, struct kobject *kobj, + struct bin_attribute *bin_attr, char *buf, + loff_t off, size_t count) + +{ + struct w1_slave *sl = kobj_to_w1_slave(kobj); + int addr, len, idx; + + count = w1_f1C_fix_count(off, count, W1_EEPROM_SIZE); + if (count == 0) + return 0; + + if (w1_enable_crccheck) { + /* can only write full blocks in cached mode */ + if ((off & W1_PAGE_MASK) || (count & W1_PAGE_MASK)) { + dev_err(&sl->dev, "invalid offset/count off=%d cnt=%zd\n", + (int)off, count); + return -EINVAL; + } + + /* make sure the block CRCs are valid */ + for (idx = 0; idx < count; idx += W1_PAGE_SIZE) { + if (crc16(CRC16_INIT, &buf[idx], W1_PAGE_SIZE) + != CRC16_VALID) { + dev_err(&sl->dev, "bad CRC at offset %d\n", + (int)off); + return -EINVAL; + } + } + } + + mutex_lock(&sl->master->mutex); + + /* Can only write data to one page at a time */ + idx = 0; + while (idx < count) { + addr = off + idx; + len = W1_PAGE_SIZE - (addr & W1_PAGE_MASK); + if (len > (count - idx)) + len = count - idx; + + if (w1_f1C_write(sl, addr, len, &buf[idx]) < 0) { + count = -EIO; + goto out_up; + } + idx += len; + } + +out_up: + mutex_unlock(&sl->master->mutex); + + return count; +} + +static BIN_ATTR_RW(eeprom, W1_EEPROM_SIZE); + +static ssize_t pio_read(struct file *filp, struct kobject *kobj, + struct bin_attribute *bin_attr, char *buf, loff_t off, + size_t count) + +{ + struct w1_slave *sl = kobj_to_w1_slave(kobj); + int ret; + + /* check arguments */ + if (off != 0 || count != 1 || buf == NULL) + return -EINVAL; + + mutex_lock(&sl->master->mutex); + ret = w1_f1C_read(sl, W1_1C_REG_LOGIC_STATE, count, buf); + mutex_unlock(&sl->master->mutex); + + return ret; +} + +static ssize_t pio_write(struct file *filp, struct kobject *kobj, + struct bin_attribute *bin_attr, char *buf, loff_t off, + size_t count) + +{ + struct w1_slave *sl = kobj_to_w1_slave(kobj); + u8 wrbuf[3]; + u8 ack; + + /* check arguments */ + if (off != 0 || count != 1 || buf == NULL) + return -EINVAL; + + mutex_lock(&sl->master->mutex); + + /* Write the PIO data */ + if (w1_reset_select_slave(sl)) { + mutex_unlock(&sl->master->mutex); + return -1; + } + + /* set bit 7..2 to value '1' */ + *buf = *buf | 0xFC; + + wrbuf[0] = W1_F1C_ACCESS_WRITE; + wrbuf[1] = *buf; + wrbuf[2] = ~(*buf); + w1_write_block(sl->master, wrbuf, 3); + + w1_read_block(sl->master, &ack, sizeof(ack)); + + mutex_unlock(&sl->master->mutex); + + /* check for acknowledgement */ + if (ack != 0xAA) + return -EIO; + + return count; +} + +static BIN_ATTR_RW(pio, 1); + +static ssize_t crccheck_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + if (put_user(w1_enable_crccheck + 0x30, buf)) + return -EFAULT; + + return sizeof(w1_enable_crccheck); +} + +static ssize_t crccheck_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + char val; + + if (count != 1 || !buf) + return -EINVAL; + + if (get_user(val, buf)) + return -EFAULT; + + /* convert to decimal */ + val = val - 0x30; + if (val != 0 && val != 1) + return -EINVAL; + + /* set the new value */ + w1_enable_crccheck = val; + + return sizeof(w1_enable_crccheck); +} + +static DEVICE_ATTR_RW(crccheck); + +static struct attribute *w1_f1C_attrs[] = { + &dev_attr_crccheck.attr, + NULL, +}; + +static struct bin_attribute *w1_f1C_bin_attrs[] = { + &bin_attr_eeprom, + &bin_attr_pio, + NULL, +}; + +static const struct attribute_group w1_f1C_group = { + .attrs = w1_f1C_attrs, + .bin_attrs = w1_f1C_bin_attrs, +}; + +static const struct attribute_group *w1_f1C_groups[] = { + &w1_f1C_group, + NULL, +}; + +static int w1_f1C_add_slave(struct w1_slave *sl) +{ + struct w1_f1C_data *data = NULL; + + if (w1_enable_crccheck) { + data = kzalloc(sizeof(struct w1_f1C_data), GFP_KERNEL); + if (!data) + return -ENOMEM; + sl->family_data = data; + } + + return 0; +} + +static void w1_f1C_remove_slave(struct w1_slave *sl) +{ + kfree(sl->family_data); + sl->family_data = NULL; +} + +static struct w1_family_ops w1_f1C_fops = { + .add_slave = w1_f1C_add_slave, + .remove_slave = w1_f1C_remove_slave, + .groups = w1_f1C_groups, +}; + +static struct w1_family w1_family_1C = { + .fid = W1_FAMILY_DS28E04, + .fops = &w1_f1C_fops, +}; + +static int __init w1_f1C_init(void) +{ + return w1_register_family(&w1_family_1C); +} + +static void __exit w1_f1C_fini(void) +{ + w1_unregister_family(&w1_family_1C); +} + +module_init(w1_f1C_init); +module_exit(w1_f1C_fini); diff --git a/drivers/w1/slaves/w1_smem.c b/drivers/w1/slaves/w1_smem.c index cc8c02e9259..ed4c87506de 100644 --- a/drivers/w1/slaves/w1_smem.c +++ b/drivers/w1/slaves/w1_smem.c @@ -1,7 +1,7 @@ /* * w1_smem.c * - * Copyright (c) 2004 Evgeniy Polyakov <johnpol@2ka.mipt.ru> + * Copyright (c) 2004 Evgeniy Polyakov <zbr@ioremap.net> * * * This program is free software; you can redistribute it and/or modify @@ -32,8 +32,10 @@ #include "../w1_family.h" MODULE_LICENSE("GPL"); -MODULE_AUTHOR("Evgeniy Polyakov <johnpol@2ka.mipt.ru>"); +MODULE_AUTHOR("Evgeniy Polyakov <zbr@ioremap.net>"); MODULE_DESCRIPTION("Driver for 1-wire Dallas network protocol, 64bit memory family."); +MODULE_ALIAS("w1-family-" __stringify(W1_FAMILY_SMEM_01)); +MODULE_ALIAS("w1-family-" __stringify(W1_FAMILY_SMEM_81)); static struct w1_family w1_smem_family_01 = { .fid = W1_FAMILY_SMEM_01, diff --git a/drivers/w1/slaves/w1_therm.c b/drivers/w1/slaves/w1_therm.c index fb28acaeed6..1f11a20a8ab 100644 --- a/drivers/w1/slaves/w1_therm.c +++ b/drivers/w1/slaves/w1_therm.c @@ -1,7 +1,7 @@ /* * w1_therm.c * - * Copyright (c) 2004 Evgeniy Polyakov <johnpol@2ka.mipt.ru> + * Copyright (c) 2004 Evgeniy Polyakov <zbr@ioremap.net> * * * This program is free software; you can redistribute it and/or modify @@ -27,6 +27,7 @@ #include <linux/sched.h> #include <linux/device.h> #include <linux/types.h> +#include <linux/slab.h> #include <linux/delay.h> #include "../w1.h" @@ -34,39 +35,59 @@ #include "../w1_family.h" MODULE_LICENSE("GPL"); -MODULE_AUTHOR("Evgeniy Polyakov <johnpol@2ka.mipt.ru>"); +MODULE_AUTHOR("Evgeniy Polyakov <zbr@ioremap.net>"); MODULE_DESCRIPTION("Driver for 1-wire Dallas network protocol, temperature family."); - -static u8 bad_roms[][9] = { - {0xaa, 0x00, 0x4b, 0x46, 0xff, 0xff, 0x0c, 0x10, 0x87}, - {} - }; - -static ssize_t w1_therm_read_bin(struct kobject *, struct bin_attribute *, - char *, loff_t, size_t); - -static struct bin_attribute w1_therm_bin_attr = { - .attr = { - .name = "w1_slave", - .mode = S_IRUGO, - }, - .size = W1_SLAVE_DATA_SIZE, - .read = w1_therm_read_bin, -}; +MODULE_ALIAS("w1-family-" __stringify(W1_THERM_DS18S20)); +MODULE_ALIAS("w1-family-" __stringify(W1_THERM_DS1822)); +MODULE_ALIAS("w1-family-" __stringify(W1_THERM_DS18B20)); +MODULE_ALIAS("w1-family-" __stringify(W1_THERM_DS1825)); +MODULE_ALIAS("w1-family-" __stringify(W1_THERM_DS28EA00)); + +/* Allow the strong pullup to be disabled, but default to enabled. + * If it was disabled a parasite powered device might not get the require + * current to do a temperature conversion. If it is enabled parasite powered + * devices have a better chance of getting the current required. + * In case the parasite power-detection is not working (seems to be the case + * for some DS18S20) the strong pullup can also be forced, regardless of the + * power state of the devices. + * + * Summary of options: + * - strong_pullup = 0 Disable strong pullup completely + * - strong_pullup = 1 Enable automatic strong pullup detection + * - strong_pullup = 2 Force strong pullup + */ +static int w1_strong_pullup = 1; +module_param_named(strong_pullup, w1_strong_pullup, int, 0); static int w1_therm_add_slave(struct w1_slave *sl) { - return sysfs_create_bin_file(&sl->dev.kobj, &w1_therm_bin_attr); + sl->family_data = kzalloc(9, GFP_KERNEL); + if (!sl->family_data) + return -ENOMEM; + return 0; } static void w1_therm_remove_slave(struct w1_slave *sl) { - sysfs_remove_bin_file(&sl->dev.kobj, &w1_therm_bin_attr); + kfree(sl->family_data); + sl->family_data = NULL; } +static ssize_t w1_slave_show(struct device *device, + struct device_attribute *attr, char *buf); + +static DEVICE_ATTR_RO(w1_slave); + +static struct attribute *w1_therm_attrs[] = { + &dev_attr_w1_slave.attr, + NULL, +}; +ATTRIBUTE_GROUPS(w1_therm); + static struct w1_family_ops w1_therm_fops = { .add_slave = w1_therm_add_slave, .remove_slave = w1_therm_remove_slave, + .groups = w1_therm_groups, }; static struct w1_family w1_therm_family_DS18S20 = { @@ -84,6 +105,16 @@ static struct w1_family w1_therm_family_DS1822 = { .fops = &w1_therm_fops, }; +static struct w1_family w1_therm_family_DS28EA00 = { + .fid = W1_THERM_DS28EA00, + .fops = &w1_therm_fops, +}; + +static struct w1_family w1_therm_family_DS1825 = { + .fid = W1_THERM_DS1825, + .fops = &w1_therm_fops, +}; + struct w1_therm_family_converter { u8 broken; @@ -109,13 +140,20 @@ static struct w1_therm_family_converter w1_therm_families[] = { .f = &w1_therm_family_DS18B20, .convert = w1_DS18B20_convert_temp }, + { + .f = &w1_therm_family_DS28EA00, + .convert = w1_DS18B20_convert_temp + }, + { + .f = &w1_therm_family_DS1825, + .convert = w1_DS18B20_convert_temp + } }; static inline int w1_DS18B20_convert_temp(u8 rom[9]) { - s16 t = (rom[1] << 8) | rom[0]; - t = t*1000/16; - return t; + s16 t = le16_to_cpup((__le16 *)rom); + return t*1000/16; } static inline int w1_DS18S20_convert_temp(u8 rom[9]) @@ -149,58 +187,70 @@ static inline int w1_convert_temp(u8 rom[9], u8 fid) return 0; } -static int w1_therm_check_rom(u8 rom[9]) -{ - int i; - - for (i=0; i<sizeof(bad_roms)/9; ++i) - if (!memcmp(bad_roms[i], rom, 9)) - return 1; - return 0; -} - -static ssize_t w1_therm_read_bin(struct kobject *kobj, - struct bin_attribute *bin_attr, - char *buf, loff_t off, size_t count) +static ssize_t w1_slave_show(struct device *device, + struct device_attribute *attr, char *buf) { - struct w1_slave *sl = kobj_to_w1_slave(kobj); + struct w1_slave *sl = dev_to_w1_slave(device); struct w1_master *dev = sl->master; - u8 rom[9], crc, verdict; + u8 rom[9], crc, verdict, external_power; int i, max_trying = 10; + ssize_t c = PAGE_SIZE; - mutex_lock(&sl->master->mutex); - - if (off > W1_SLAVE_DATA_SIZE) { - count = 0; - goto out; - } - if (off + count > W1_SLAVE_DATA_SIZE) { - count = 0; - goto out; - } + i = mutex_lock_interruptible(&dev->bus_mutex); + if (i != 0) + return i; - memset(buf, 0, count); memset(rom, 0, sizeof(rom)); - count = 0; - verdict = 0; - crc = 0; - while (max_trying--) { + + verdict = 0; + crc = 0; + if (!w1_reset_select_slave(sl)) { int count = 0; unsigned int tm = 750; + unsigned long sleep_rem; + + w1_write_8(dev, W1_READ_PSUPPLY); + external_power = w1_read_8(dev); + + if (w1_reset_select_slave(sl)) + continue; + + /* 750ms strong pullup (or delay) after the convert */ + if (w1_strong_pullup == 2 || + (!external_power && w1_strong_pullup)) + w1_next_pullup(dev, tm); w1_write_8(dev, W1_CONVERT_TEMP); - msleep(tm); + if (external_power) { + mutex_unlock(&dev->bus_mutex); + + sleep_rem = msleep_interruptible(tm); + if (sleep_rem != 0) + return -EINTR; + + i = mutex_lock_interruptible(&dev->bus_mutex); + if (i != 0) + return i; + } else if (!w1_strong_pullup) { + sleep_rem = msleep_interruptible(tm); + if (sleep_rem != 0) { + mutex_unlock(&dev->bus_mutex); + return -EINTR; + } + } if (!w1_reset_select_slave(sl)) { w1_write_8(dev, W1_READ_SCRATCHPAD); if ((count = w1_read_block(dev, rom, 9)) != 9) { - dev_warn(&dev->dev, "w1_read_block() returned %d instead of 9.\n", count); + dev_warn(device, "w1_read_block() " + "returned %u instead of 9.\n", + count); } crc = w1_calc_crc8(rom, 8); @@ -210,27 +260,28 @@ static ssize_t w1_therm_read_bin(struct kobject *kobj, } } - if (!w1_therm_check_rom(rom)) + if (verdict) break; } for (i = 0; i < 9; ++i) - count += sprintf(buf + count, "%02x ", rom[i]); - count += sprintf(buf + count, ": crc=%02x %s\n", + c -= snprintf(buf + PAGE_SIZE - c, c, "%02x ", rom[i]); + c -= snprintf(buf + PAGE_SIZE - c, c, ": crc=%02x %s\n", crc, (verdict) ? "YES" : "NO"); if (verdict) - memcpy(sl->rom, rom, sizeof(sl->rom)); + memcpy(sl->family_data, rom, sizeof(rom)); else - dev_warn(&dev->dev, "18S20 doesn't respond to CONVERT_TEMP.\n"); + dev_warn(device, "Read failed CRC check\n"); for (i = 0; i < 9; ++i) - count += sprintf(buf + count, "%02x ", sl->rom[i]); + c -= snprintf(buf + PAGE_SIZE - c, c, "%02x ", + ((u8 *)sl->family_data)[i]); - count += sprintf(buf + count, "t=%d\n", w1_convert_temp(rom, sl->family->fid)); -out: - mutex_unlock(&dev->mutex); + c -= snprintf(buf + PAGE_SIZE - c, c, "t=%d\n", + w1_convert_temp(rom, sl->family->fid)); + mutex_unlock(&dev->bus_mutex); - return count; + return PAGE_SIZE - c; } static int __init w1_therm_init(void) diff --git a/drivers/w1/w1.c b/drivers/w1/w1.c index 7293c9b11f9..5d734152054 100644 --- a/drivers/w1/w1.c +++ b/drivers/w1/w1.c @@ -1,7 +1,7 @@ /* * w1.c * - * Copyright (c) 2004 Evgeniy Polyakov <johnpol@2ka.mipt.ru> + * Copyright (c) 2004 Evgeniy Polyakov <zbr@ioremap.net> * * * This program is free software; you can redistribute it and/or modify @@ -33,7 +33,7 @@ #include <linux/kthread.h> #include <linux/freezer.h> -#include <asm/atomic.h> +#include <linux/atomic.h> #include "w1.h" #include "w1_log.h" @@ -42,24 +42,33 @@ #include "w1_netlink.h" MODULE_LICENSE("GPL"); -MODULE_AUTHOR("Evgeniy Polyakov <johnpol@2ka.mipt.ru>"); +MODULE_AUTHOR("Evgeniy Polyakov <zbr@ioremap.net>"); MODULE_DESCRIPTION("Driver for 1-wire Dallas network protocol."); static int w1_timeout = 10; -static int w1_control_timeout = 1; -int w1_max_slave_count = 10; +int w1_max_slave_count = 64; int w1_max_slave_ttl = 10; module_param_named(timeout, w1_timeout, int, 0); -module_param_named(control_timeout, w1_control_timeout, int, 0); +MODULE_PARM_DESC(timeout, "time in seconds between automatic slave searches"); +/* A search stops when w1_max_slave_count devices have been found in that + * search. The next search will start over and detect the same set of devices + * on a static 1-wire bus. Memory is not allocated based on this number, just + * on the number of devices known to the kernel. Having a high number does not + * consume additional resources. As a special case, if there is only one + * device on the network and w1_max_slave_count is set to 1, the device id can + * be read directly skipping the normal slower search process. + */ module_param_named(max_slave_count, w1_max_slave_count, int, 0); +MODULE_PARM_DESC(max_slave_count, + "maximum number of slaves detected in a search"); module_param_named(slave_ttl, w1_max_slave_ttl, int, 0); +MODULE_PARM_DESC(slave_ttl, + "Number of searches not seeing a slave before it will be removed"); DEFINE_MUTEX(w1_mlock); LIST_HEAD(w1_masters); -static struct task_struct *w1_control_thread; - static int w1_master_match(struct device *dev, struct device_driver *drv) { return 1; @@ -83,63 +92,43 @@ static void w1_slave_release(struct device *dev) { struct w1_slave *sl = dev_to_w1_slave(dev); - printk("%s: Releasing %s.\n", __func__, sl->name); - - while (atomic_read(&sl->refcnt)) { - printk("Waiting for %s to become free: refcnt=%d.\n", - sl->name, atomic_read(&sl->refcnt)); - if (msleep_interruptible(1000)) - flush_signals(current); - } + dev_dbg(dev, "%s: Releasing %s [%p]\n", __func__, sl->name, sl); w1_family_put(sl->family); sl->master->slave_count--; - - complete(&sl->released); } -static ssize_t w1_slave_read_name(struct device *dev, struct device_attribute *attr, char *buf) +static ssize_t name_show(struct device *dev, struct device_attribute *attr, char *buf) { struct w1_slave *sl = dev_to_w1_slave(dev); return sprintf(buf, "%s\n", sl->name); } +static DEVICE_ATTR_RO(name); -static ssize_t w1_slave_read_id(struct kobject *kobj, - struct bin_attribute *bin_attr, - char *buf, loff_t off, size_t count) +static ssize_t id_show(struct device *dev, + struct device_attribute *attr, char *buf) { - struct w1_slave *sl = kobj_to_w1_slave(kobj); - - if (off > 8) { - count = 0; - } else { - if (off + count > 8) - count = 8 - off; - - memcpy(buf, (u8 *)&sl->reg_num, count); - } + struct w1_slave *sl = dev_to_w1_slave(dev); + ssize_t count = sizeof(sl->reg_num); + memcpy(buf, (u8 *)&sl->reg_num, count); return count; } +static DEVICE_ATTR_RO(id); -static struct device_attribute w1_slave_attr_name = - __ATTR(name, S_IRUGO, w1_slave_read_name, NULL); - -static struct bin_attribute w1_slave_attr_bin_id = { - .attr = { - .name = "id", - .mode = S_IRUGO, - }, - .size = 8, - .read = w1_slave_read_id, +static struct attribute *w1_slave_attrs[] = { + &dev_attr_name.attr, + &dev_attr_id.attr, + NULL, }; +ATTRIBUTE_GROUPS(w1_slave); /* Default family */ -static ssize_t w1_default_write(struct kobject *kobj, - struct bin_attribute *bin_attr, - char *buf, loff_t off, size_t count) +static ssize_t rw_write(struct file *filp, struct kobject *kobj, + struct bin_attribute *bin_attr, char *buf, loff_t off, + size_t count) { struct w1_slave *sl = kobj_to_w1_slave(kobj); @@ -156,9 +145,9 @@ out_up: return count; } -static ssize_t w1_default_read(struct kobject *kobj, - struct bin_attribute *bin_attr, - char *buf, loff_t off, size_t count) +static ssize_t rw_read(struct file *filp, struct kobject *kobj, + struct bin_attribute *bin_attr, char *buf, loff_t off, + size_t count) { struct w1_slave *sl = kobj_to_w1_slave(kobj); @@ -168,29 +157,24 @@ static ssize_t w1_default_read(struct kobject *kobj, return count; } -static struct bin_attribute w1_default_attr = { - .attr = { - .name = "rw", - .mode = S_IRUGO | S_IWUSR, - }, - .size = PAGE_SIZE, - .read = w1_default_read, - .write = w1_default_write, +static BIN_ATTR_RW(rw, PAGE_SIZE); + +static struct bin_attribute *w1_slave_bin_attrs[] = { + &bin_attr_rw, + NULL, }; -static int w1_default_add_slave(struct w1_slave *sl) -{ - return sysfs_create_bin_file(&sl->dev.kobj, &w1_default_attr); -} +static const struct attribute_group w1_slave_default_group = { + .bin_attrs = w1_slave_bin_attrs, +}; -static void w1_default_remove_slave(struct w1_slave *sl) -{ - sysfs_remove_bin_file(&sl->dev.kobj, &w1_default_attr); -} +static const struct attribute_group *w1_slave_default_groups[] = { + &w1_slave_default_group, + NULL, +}; static struct w1_family_ops w1_default_fops = { - .add_slave = w1_default_add_slave, - .remove_slave = w1_default_remove_slave, + .groups = w1_slave_default_groups, }; static struct w1_family w1_default_family = { @@ -214,7 +198,7 @@ struct device_driver w1_master_driver = { struct device w1_master_device = { .parent = NULL, .bus = &w1_bus_type, - .bus_id = "w1 bus master", + .init_name = "w1 bus master", .driver = &w1_master_driver, .release = &w1_master_release }; @@ -228,7 +212,7 @@ static struct device_driver w1_slave_driver = { struct device w1_slave_device = { .parent = NULL, .bus = &w1_bus_type, - .bus_id = "w1 bus slave", + .init_name = "w1 bus slave", .driver = &w1_slave_driver, .release = &w1_slave_release }; @@ -250,11 +234,20 @@ static ssize_t w1_master_attribute_store_search(struct device * dev, struct device_attribute *attr, const char * buf, size_t count) { + long tmp; struct w1_master *md = dev_to_w1_master(dev); + int ret; + + ret = kstrtol(buf, 0, &tmp); + if (ret) + return ret; mutex_lock(&md->mutex); - md->search_count = simple_strtol(buf, NULL, 0); + md->search_count = tmp; mutex_unlock(&md->mutex); + /* Only wake if it is going to be searching. */ + if (tmp) + wake_up_process(md->thread); return count; } @@ -273,6 +266,39 @@ static ssize_t w1_master_attribute_show_search(struct device *dev, return count; } +static ssize_t w1_master_attribute_store_pullup(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + long tmp; + struct w1_master *md = dev_to_w1_master(dev); + int ret; + + ret = kstrtol(buf, 0, &tmp); + if (ret) + return ret; + + mutex_lock(&md->mutex); + md->enable_pullup = tmp; + mutex_unlock(&md->mutex); + + return count; +} + +static ssize_t w1_master_attribute_show_pullup(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct w1_master *md = dev_to_w1_master(dev); + ssize_t count; + + mutex_lock(&md->mutex); + count = sprintf(buf, "%d\n", md->enable_pullup); + mutex_unlock(&md->mutex); + + return count; +} + static ssize_t w1_master_attribute_show_pointer(struct device *dev, struct device_attribute *attr, char *buf) { struct w1_master *md = dev_to_w1_master(dev); @@ -291,6 +317,24 @@ static ssize_t w1_master_attribute_show_timeout(struct device *dev, struct devic return count; } +static ssize_t w1_master_attribute_store_max_slave_count(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + int tmp; + struct w1_master *md = dev_to_w1_master(dev); + + if (kstrtoint(buf, 0, &tmp) == -EINVAL || tmp < 1) + return -EINVAL; + + mutex_lock(&md->mutex); + md->max_slave_count = tmp; + /* allow each time the max_slave_count is updated */ + clear_bit(W1_WARN_MAX_COUNT, &md->flags); + mutex_unlock(&md->mutex); + + return count; +} + static ssize_t w1_master_attribute_show_max_slave_count(struct device *dev, struct device_attribute *attr, char *buf) { struct w1_master *md = dev_to_w1_master(dev); @@ -324,31 +368,164 @@ static ssize_t w1_master_attribute_show_slave_count(struct device *dev, struct d return count; } -static ssize_t w1_master_attribute_show_slaves(struct device *dev, struct device_attribute *attr, char *buf) +static ssize_t w1_master_attribute_show_slaves(struct device *dev, + struct device_attribute *attr, char *buf) { struct w1_master *md = dev_to_w1_master(dev); int c = PAGE_SIZE; + struct list_head *ent, *n; + struct w1_slave *sl = NULL; - mutex_lock(&md->mutex); + mutex_lock(&md->list_mutex); + + list_for_each_safe(ent, n, &md->slist) { + sl = list_entry(ent, struct w1_slave, w1_slave_entry); - if (md->slave_count == 0) + c -= snprintf(buf + PAGE_SIZE - c, c, "%s\n", sl->name); + } + if (!sl) c -= snprintf(buf + PAGE_SIZE - c, c, "not found.\n"); - else { - struct list_head *ent, *n; - struct w1_slave *sl; - list_for_each_safe(ent, n, &md->slist) { - sl = list_entry(ent, struct w1_slave, w1_slave_entry); + mutex_unlock(&md->list_mutex); + + return PAGE_SIZE - c; +} + +static ssize_t w1_master_attribute_show_add(struct device *dev, + struct device_attribute *attr, char *buf) +{ + int c = PAGE_SIZE; + c -= snprintf(buf+PAGE_SIZE - c, c, + "write device id xx-xxxxxxxxxxxx to add slave\n"); + return PAGE_SIZE - c; +} + +static int w1_atoreg_num(struct device *dev, const char *buf, size_t count, + struct w1_reg_num *rn) +{ + unsigned int family; + unsigned long long id; + int i; + u64 rn64_le; + + /* The CRC value isn't read from the user because the sysfs directory + * doesn't include it and most messages from the bus search don't + * print it either. It would be unreasonable for the user to then + * provide it. + */ + const char *error_msg = "bad slave string format, expecting " + "ff-dddddddddddd\n"; + + if (buf[2] != '-') { + dev_err(dev, "%s", error_msg); + return -EINVAL; + } + i = sscanf(buf, "%02x-%012llx", &family, &id); + if (i != 2) { + dev_err(dev, "%s", error_msg); + return -EINVAL; + } + rn->family = family; + rn->id = id; + + rn64_le = cpu_to_le64(*(u64 *)rn); + rn->crc = w1_calc_crc8((u8 *)&rn64_le, 7); + +#if 0 + dev_info(dev, "With CRC device is %02x.%012llx.%02x.\n", + rn->family, (unsigned long long)rn->id, rn->crc); +#endif - c -= snprintf(buf + PAGE_SIZE - c, c, "%s\n", sl->name); + return 0; +} + +/* Searches the slaves in the w1_master and returns a pointer or NULL. + * Note: must not hold list_mutex + */ +struct w1_slave *w1_slave_search_device(struct w1_master *dev, + struct w1_reg_num *rn) +{ + struct w1_slave *sl; + mutex_lock(&dev->list_mutex); + list_for_each_entry(sl, &dev->slist, w1_slave_entry) { + if (sl->reg_num.family == rn->family && + sl->reg_num.id == rn->id && + sl->reg_num.crc == rn->crc) { + mutex_unlock(&dev->list_mutex); + return sl; } } + mutex_unlock(&dev->list_mutex); + return NULL; +} +static ssize_t w1_master_attribute_store_add(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct w1_master *md = dev_to_w1_master(dev); + struct w1_reg_num rn; + struct w1_slave *sl; + ssize_t result = count; + + if (w1_atoreg_num(dev, buf, count, &rn)) + return -EINVAL; + + mutex_lock(&md->mutex); + sl = w1_slave_search_device(md, &rn); + /* It would be nice to do a targeted search one the one-wire bus + * for the new device to see if it is out there or not. But the + * current search doesn't support that. + */ + if (sl) { + dev_info(dev, "Device %s already exists\n", sl->name); + result = -EINVAL; + } else { + w1_attach_slave_device(md, &rn); + } mutex_unlock(&md->mutex); + return result; +} + +static ssize_t w1_master_attribute_show_remove(struct device *dev, + struct device_attribute *attr, char *buf) +{ + int c = PAGE_SIZE; + c -= snprintf(buf+PAGE_SIZE - c, c, + "write device id xx-xxxxxxxxxxxx to remove slave\n"); return PAGE_SIZE - c; } +static ssize_t w1_master_attribute_store_remove(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct w1_master *md = dev_to_w1_master(dev); + struct w1_reg_num rn; + struct w1_slave *sl; + ssize_t result = count; + + if (w1_atoreg_num(dev, buf, count, &rn)) + return -EINVAL; + + mutex_lock(&md->mutex); + sl = w1_slave_search_device(md, &rn); + if (sl) { + result = w1_slave_detach(sl); + /* refcnt 0 means it was detached in the call */ + if (result == 0) + result = count; + } else { + dev_info(dev, "Device %02x-%012llx doesn't exists\n", rn.family, + (unsigned long long)rn.id); + result = -EINVAL; + } + mutex_unlock(&md->mutex); + + return result; +} + #define W1_MASTER_ATTR_RO(_name, _mode) \ struct device_attribute w1_master_attribute_##_name = \ __ATTR(w1_master_##_name, _mode, \ @@ -363,11 +540,14 @@ static ssize_t w1_master_attribute_show_slaves(struct device *dev, struct device static W1_MASTER_ATTR_RO(name, S_IRUGO); static W1_MASTER_ATTR_RO(slaves, S_IRUGO); static W1_MASTER_ATTR_RO(slave_count, S_IRUGO); -static W1_MASTER_ATTR_RO(max_slave_count, S_IRUGO); +static W1_MASTER_ATTR_RW(max_slave_count, S_IRUGO | S_IWUSR | S_IWGRP); static W1_MASTER_ATTR_RO(attempts, S_IRUGO); static W1_MASTER_ATTR_RO(timeout, S_IRUGO); static W1_MASTER_ATTR_RO(pointer, S_IRUGO); -static W1_MASTER_ATTR_RW(search, S_IRUGO | S_IWUGO); +static W1_MASTER_ATTR_RW(search, S_IRUGO | S_IWUSR | S_IWGRP); +static W1_MASTER_ATTR_RW(pullup, S_IRUGO | S_IWUSR | S_IWGRP); +static W1_MASTER_ATTR_RW(add, S_IRUGO | S_IWUSR | S_IWGRP); +static W1_MASTER_ATTR_RW(remove, S_IRUGO | S_IWUSR | S_IWGRP); static struct attribute *w1_master_default_attrs[] = { &w1_master_attribute_name.attr, @@ -378,6 +558,9 @@ static struct attribute *w1_master_default_attrs[] = { &w1_master_attribute_timeout.attr, &w1_master_attribute_pointer.attr, &w1_master_attribute_search.attr, + &w1_master_attribute_pullup.attr, + &w1_master_attribute_add.attr, + &w1_master_attribute_remove.attr, NULL }; @@ -390,18 +573,17 @@ int w1_create_master_attributes(struct w1_master *master) return sysfs_create_group(&master->dev.kobj, &w1_master_defattr_group); } -static void w1_destroy_master_attributes(struct w1_master *master) +void w1_destroy_master_attributes(struct w1_master *master) { sysfs_remove_group(&master->dev.kobj, &w1_master_defattr_group); } -#ifdef CONFIG_HOTPLUG static int w1_uevent(struct device *dev, struct kobj_uevent_env *env) { struct w1_master *md = NULL; struct w1_slave *sl = NULL; char *event_owner, *name; - int err; + int err = 0; if (dev->driver == &w1_master_driver) { md = container_of(dev, struct w1_master, dev); @@ -417,28 +599,63 @@ static int w1_uevent(struct device *dev, struct kobj_uevent_env *env) } dev_dbg(dev, "Hotplug event for %s %s, bus_id=%s.\n", - event_owner, name, dev->bus_id); + event_owner, name, dev_name(dev)); if (dev->driver != &w1_slave_driver || !sl) - return 0; + goto end; err = add_uevent_var(env, "W1_FID=%02X", sl->reg_num.family); if (err) - return err; + goto end; err = add_uevent_var(env, "W1_SLAVE_ID=%024LX", (unsigned long long)sl->reg_num.id); - if (err) - return err; +end: + return err; +} - return 0; -}; -#else -static int w1_uevent(struct device *dev, struct kobj_uevent_env *env) +static int w1_family_notify(unsigned long action, struct w1_slave *sl) { + struct w1_family_ops *fops; + int err; + + fops = sl->family->fops; + + if (!fops) + return 0; + + switch (action) { + case BUS_NOTIFY_ADD_DEVICE: + /* if the family driver needs to initialize something... */ + if (fops->add_slave) { + err = fops->add_slave(sl); + if (err < 0) { + dev_err(&sl->dev, + "add_slave() call failed. err=%d\n", + err); + return err; + } + } + if (fops->groups) { + err = sysfs_create_groups(&sl->dev.kobj, fops->groups); + if (err) { + dev_err(&sl->dev, + "sysfs group creation failed. err=%d\n", + err); + return err; + } + } + + break; + case BUS_NOTIFY_DEL_DEVICE: + if (fops->remove_slave) + sl->family->fops->remove_slave(sl); + if (fops->groups) + sysfs_remove_groups(&sl->dev.kobj, fops->groups); + break; + } return 0; } -#endif static int __w1_attach_slave_device(struct w1_slave *sl) { @@ -448,9 +665,9 @@ static int __w1_attach_slave_device(struct w1_slave *sl) sl->dev.driver = &w1_slave_driver; sl->dev.bus = &w1_bus_type; sl->dev.release = &w1_slave_release; + sl->dev.groups = w1_slave_groups; - snprintf(&sl->dev.bus_id[0], sizeof(sl->dev.bus_id), - "%02x-%012llx", + dev_set_name(&sl->dev, "%02x-%012llx", (unsigned int) sl->reg_num.family, (unsigned long long) sl->reg_num.id); snprintf(&sl->name[0], sizeof(sl->name), @@ -459,57 +676,31 @@ static int __w1_attach_slave_device(struct w1_slave *sl) (unsigned long long) sl->reg_num.id); dev_dbg(&sl->dev, "%s: registering %s as %p.\n", __func__, - &sl->dev.bus_id[0], sl); + dev_name(&sl->dev), sl); + + /* suppress for w1_family_notify before sending KOBJ_ADD */ + dev_set_uevent_suppress(&sl->dev, true); err = device_register(&sl->dev); if (err < 0) { dev_err(&sl->dev, "Device registration [%s] failed. err=%d\n", - sl->dev.bus_id, err); + dev_name(&sl->dev), err); return err; } + w1_family_notify(BUS_NOTIFY_ADD_DEVICE, sl); - /* Create "name" entry */ - err = device_create_file(&sl->dev, &w1_slave_attr_name); - if (err < 0) { - dev_err(&sl->dev, - "sysfs file creation for [%s] failed. err=%d\n", - sl->dev.bus_id, err); - goto out_unreg; - } - - /* Create "id" entry */ - err = sysfs_create_bin_file(&sl->dev.kobj, &w1_slave_attr_bin_id); - if (err < 0) { - dev_err(&sl->dev, - "sysfs file creation for [%s] failed. err=%d\n", - sl->dev.bus_id, err); - goto out_rem1; - } - - /* if the family driver needs to initialize something... */ - if (sl->family->fops && sl->family->fops->add_slave && - ((err = sl->family->fops->add_slave(sl)) < 0)) { - dev_err(&sl->dev, - "sysfs file creation for [%s] failed. err=%d\n", - sl->dev.bus_id, err); - goto out_rem2; - } + dev_set_uevent_suppress(&sl->dev, false); + kobject_uevent(&sl->dev.kobj, KOBJ_ADD); + mutex_lock(&sl->master->list_mutex); list_add_tail(&sl->w1_slave_entry, &sl->master->slist); + mutex_unlock(&sl->master->list_mutex); return 0; - -out_rem2: - sysfs_remove_bin_file(&sl->dev.kobj, &w1_slave_attr_bin_id); -out_rem1: - device_remove_file(&sl->dev, &w1_slave_attr_name); -out_unreg: - device_unregister(&sl->dev); - return err; } -static int w1_attach_slave_device(struct w1_master *dev, struct w1_reg_num *rn) +int w1_attach_slave_device(struct w1_master *dev, struct w1_reg_num *rn) { struct w1_slave *sl; struct w1_family *f; @@ -527,12 +718,17 @@ static int w1_attach_slave_device(struct w1_master *dev, struct w1_reg_num *rn) sl->owner = THIS_MODULE; sl->master = dev; - set_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags); + set_bit(W1_SLAVE_ACTIVE, &sl->flags); memset(&msg, 0, sizeof(msg)); memcpy(&sl->reg_num, rn, sizeof(sl->reg_num)); - atomic_set(&sl->refcnt, 0); - init_completion(&sl->released); + atomic_set(&sl->refcnt, 1); + atomic_inc(&sl->master->refcnt); + + /* slave modules need to be loaded in a context with unlocked mutex */ + mutex_unlock(&dev->mutex); + request_module("w1-family-0x%0x", rn->family); + mutex_lock(&dev->mutex); spin_lock(&w1_flock); f = w1_family_registered(rn->family); @@ -567,46 +763,49 @@ static int w1_attach_slave_device(struct w1_master *dev, struct w1_reg_num *rn) return 0; } -static void w1_slave_detach(struct w1_slave *sl) +int w1_unref_slave(struct w1_slave *sl) { - struct w1_netlink_msg msg; - - dev_dbg(&sl->dev, "%s: detaching %s [%p].\n", __func__, sl->name, sl); - - list_del(&sl->w1_slave_entry); - - if (sl->family->fops && sl->family->fops->remove_slave) - sl->family->fops->remove_slave(sl); - - memset(&msg, 0, sizeof(msg)); - memcpy(msg.id.id, &sl->reg_num, sizeof(msg.id)); - msg.type = W1_SLAVE_REMOVE; - w1_netlink_send(sl->master, &msg); - - sysfs_remove_bin_file(&sl->dev.kobj, &w1_slave_attr_bin_id); - device_remove_file(&sl->dev, &w1_slave_attr_name); - device_unregister(&sl->dev); - - wait_for_completion(&sl->released); - kfree(sl); + struct w1_master *dev = sl->master; + int refcnt; + mutex_lock(&dev->list_mutex); + refcnt = atomic_sub_return(1, &sl->refcnt); + if (refcnt == 0) { + struct w1_netlink_msg msg; + + dev_dbg(&sl->dev, "%s: detaching %s [%p].\n", __func__, + sl->name, sl); + + list_del(&sl->w1_slave_entry); + + memset(&msg, 0, sizeof(msg)); + memcpy(msg.id.id, &sl->reg_num, sizeof(msg.id)); + msg.type = W1_SLAVE_REMOVE; + w1_netlink_send(sl->master, &msg); + + w1_family_notify(BUS_NOTIFY_DEL_DEVICE, sl); + device_unregister(&sl->dev); + #ifdef DEBUG + memset(sl, 0, sizeof(*sl)); + #endif + kfree(sl); + } + atomic_dec(&dev->refcnt); + mutex_unlock(&dev->list_mutex); + return refcnt; } -static struct w1_master *w1_search_master(void *data) +int w1_slave_detach(struct w1_slave *sl) { - struct w1_master *dev; - int found = 0; - - mutex_lock(&w1_mlock); - list_for_each_entry(dev, &w1_masters, w1_master_entry) { - if (dev->bus_master->data == data) { - found = 1; - atomic_inc(&dev->refcnt); - break; - } - } - mutex_unlock(&w1_mlock); - - return (found)?dev:NULL; + /* Only detach a slave once as it decreases the refcnt each time. */ + int destroy_now; + mutex_lock(&sl->master->list_mutex); + destroy_now = !test_bit(W1_SLAVE_DETACH, &sl->flags); + set_bit(W1_SLAVE_DETACH, &sl->flags); + mutex_unlock(&sl->master->list_mutex); + + if (destroy_now) + destroy_now = !w1_unref_slave(sl); + return destroy_now ? 0 : -EBUSY; } struct w1_master *w1_search_master_id(u32 id) @@ -635,7 +834,7 @@ struct w1_slave *w1_search_slave(struct w1_reg_num *id) mutex_lock(&w1_mlock); list_for_each_entry(dev, &w1_masters, w1_master_entry) { - mutex_lock(&dev->mutex); + mutex_lock(&dev->list_mutex); list_for_each_entry(sl, &dev->slist, w1_slave_entry) { if (sl->reg_num.family == id->family && sl->reg_num.id == id->id && @@ -646,7 +845,7 @@ struct w1_slave *w1_search_slave(struct w1_reg_num *id) break; } } - mutex_unlock(&dev->mutex); + mutex_unlock(&dev->list_mutex); if (found) break; @@ -656,62 +855,74 @@ struct w1_slave *w1_search_slave(struct w1_reg_num *id) return (found)?sl:NULL; } -void w1_reconnect_slaves(struct w1_family *f) +void w1_reconnect_slaves(struct w1_family *f, int attach) { + struct w1_slave *sl, *sln; struct w1_master *dev; mutex_lock(&w1_mlock); list_for_each_entry(dev, &w1_masters, w1_master_entry) { - dev_dbg(&dev->dev, "Reconnecting slaves in %s into new family %02x.\n", - dev->name, f->fid); - set_bit(W1_MASTER_NEED_RECONNECT, &dev->flags); + dev_dbg(&dev->dev, "Reconnecting slaves in device %s " + "for family %02x.\n", dev->name, f->fid); + mutex_lock(&dev->mutex); + mutex_lock(&dev->list_mutex); + list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) { + /* If it is a new family, slaves with the default + * family driver and are that family will be + * connected. If the family is going away, devices + * matching that family are reconneced. + */ + if ((attach && sl->family->fid == W1_FAMILY_DEFAULT + && sl->reg_num.family == f->fid) || + (!attach && sl->family->fid == f->fid)) { + struct w1_reg_num rn; + + mutex_unlock(&dev->list_mutex); + memcpy(&rn, &sl->reg_num, sizeof(rn)); + /* If it was already in use let the automatic + * scan pick it up again later. + */ + if (!w1_slave_detach(sl)) + w1_attach_slave_device(dev, &rn); + mutex_lock(&dev->list_mutex); + } + } + dev_dbg(&dev->dev, "Reconnecting slaves in device %s " + "has been finished.\n", dev->name); + mutex_unlock(&dev->list_mutex); + mutex_unlock(&dev->mutex); } mutex_unlock(&w1_mlock); } -static void w1_slave_found(void *data, u64 rn) +void w1_slave_found(struct w1_master *dev, u64 rn) { - int slave_count; struct w1_slave *sl; - struct list_head *ent; struct w1_reg_num *tmp; - struct w1_master *dev; u64 rn_le = cpu_to_le64(rn); - dev = w1_search_master(data); - if (!dev) { - printk(KERN_ERR "Failed to find w1 master device for data %p, " - "it is impossible.\n", data); - return; - } + atomic_inc(&dev->refcnt); tmp = (struct w1_reg_num *) &rn; - slave_count = 0; - list_for_each(ent, &dev->slist) { - - sl = list_entry(ent, struct w1_slave, w1_slave_entry); - - if (sl->reg_num.family == tmp->family && - sl->reg_num.id == tmp->id && - sl->reg_num.crc == tmp->crc) { - set_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags); - break; - } - - slave_count++; - } - - if (slave_count == dev->slave_count && - rn && ((rn >> 56) & 0xff) == w1_calc_crc8((u8 *)&rn_le, 7)) { - w1_attach_slave_device(dev, tmp); + sl = w1_slave_search_device(dev, tmp); + if (sl) { + set_bit(W1_SLAVE_ACTIVE, &sl->flags); + } else { + if (rn && tmp->crc == w1_calc_crc8((u8 *)&rn_le, 7)) + w1_attach_slave_device(dev, tmp); } atomic_dec(&dev->refcnt); } /** - * Performs a ROM Search & registers any devices found. + * w1_search() - Performs a ROM Search & registers any devices found. + * @dev: The master device to search + * @search_type: W1_SEARCH to search all devices, or W1_ALARM_SEARCH + * to return only devices in the alarmed state + * @cb: Function to call when a device is found + * * The 1-wire search is a simple binary tree search. * For each bit of the address, we read two bits and write one bit. * The bit written will put to sleep all devies that don't match that bit. @@ -721,8 +932,6 @@ static void w1_slave_found(void *data, u64 rn) * * See "Application note 187 1-wire search algorithm" at www.maxim-ic.com * - * @dev The master device to search - * @cb Function to call when a device is found */ void w1_search(struct w1_master *dev, u8 search_type, w1_slave_found_callback cb) { @@ -733,7 +942,8 @@ void w1_search(struct w1_master *dev, u8 search_type, w1_slave_found_callback cb u8 triplet_ret = 0; search_bit = 0; - rn = last_rn = 0; + rn = dev->search_id; + last_rn = 0; last_device = 0; last_zero = -1; @@ -749,11 +959,26 @@ void w1_search(struct w1_master *dev, u8 search_type, w1_slave_found_callback cb * * Return 0 - device(s) present, 1 - no devices present. */ + mutex_lock(&dev->bus_mutex); if (w1_reset_bus(dev)) { + mutex_unlock(&dev->bus_mutex); dev_dbg(&dev->dev, "No devices present on the wire.\n"); break; } + /* Do fast search on single slave bus */ + if (dev->max_slave_count == 1) { + int rv; + w1_write_8(dev, W1_READ_ROM); + rv = w1_read_block(dev, (u8 *)&rn, 8); + mutex_unlock(&dev->bus_mutex); + + if (rv == 8 && rn) + cb(dev, rn); + + break; + } + /* Start the search */ w1_write_8(dev, search_type); for (i = 0; i < 64; ++i) { @@ -765,7 +990,7 @@ void w1_search(struct w1_master *dev, u8 search_type, w1_slave_found_callback cb else search_bit = ((last_rn >> i) & 0x1); - /** Read two bits and write one bit */ + /* Read two bits and write one bit */ triplet_ret = w1_triplet(dev, search_bit); /* quit if no device responded */ @@ -779,122 +1004,153 @@ void w1_search(struct w1_master *dev, u8 search_type, w1_slave_found_callback cb /* extract the direction taken & update the device number */ tmp64 = (triplet_ret >> 2); rn |= (tmp64 << i); + + if (test_bit(W1_ABORT_SEARCH, &dev->flags)) { + mutex_unlock(&dev->bus_mutex); + dev_dbg(&dev->dev, "Abort w1_search\n"); + return; + } } + mutex_unlock(&dev->bus_mutex); if ( (triplet_ret & 0x03) != 0x03 ) { - if ( (desc_bit == last_zero) || (last_zero < 0)) + if ((desc_bit == last_zero) || (last_zero < 0)) { last_device = 1; + dev->search_id = 0; + } else { + dev->search_id = rn; + } desc_bit = last_zero; - cb(dev->bus_master->data, rn); + cb(dev, rn); } - } -} - -static int w1_control(void *data) -{ - struct w1_slave *sl, *sln; - struct w1_master *dev, *n; - int have_to_wait = 0; - - set_freezable(); - while (!kthread_should_stop() || have_to_wait) { - have_to_wait = 0; - try_to_freeze(); - msleep_interruptible(w1_control_timeout * 1000); - - list_for_each_entry_safe(dev, n, &w1_masters, w1_master_entry) { - if (!kthread_should_stop() && !dev->flags) - continue; - /* - * Little race: we can create thread but not set the flag. - * Get a chance for external process to set flag up. + if (!last_device && slave_count == dev->max_slave_count && + !test_bit(W1_WARN_MAX_COUNT, &dev->flags)) { + /* Only max_slave_count will be scanned in a search, + * but it will start where it left off next search + * until all ids are identified and then it will start + * over. A continued search will report the previous + * last id as the first id (provided it is still on the + * bus). */ - if (!dev->initialized) { - have_to_wait = 1; - continue; - } - - if (kthread_should_stop() || test_bit(W1_MASTER_NEED_EXIT, &dev->flags)) { - set_bit(W1_MASTER_NEED_EXIT, &dev->flags); - - mutex_lock(&w1_mlock); - list_del(&dev->w1_master_entry); - mutex_unlock(&w1_mlock); - - mutex_lock(&dev->mutex); - list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) { - w1_slave_detach(sl); - } - w1_destroy_master_attributes(dev); - mutex_unlock(&dev->mutex); - atomic_dec(&dev->refcnt); - continue; - } - - if (test_bit(W1_MASTER_NEED_RECONNECT, &dev->flags)) { - dev_dbg(&dev->dev, "Reconnecting slaves in device %s.\n", dev->name); - mutex_lock(&dev->mutex); - list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) { - if (sl->family->fid == W1_FAMILY_DEFAULT) { - struct w1_reg_num rn; - - memcpy(&rn, &sl->reg_num, sizeof(rn)); - w1_slave_detach(sl); - - w1_attach_slave_device(dev, &rn); - } - } - dev_dbg(&dev->dev, "Reconnecting slaves in device %s has been finished.\n", dev->name); - clear_bit(W1_MASTER_NEED_RECONNECT, &dev->flags); - mutex_unlock(&dev->mutex); - } + dev_info(&dev->dev, "%s: max_slave_count %d reached, " + "will continue next search.\n", __func__, + dev->max_slave_count); + set_bit(W1_WARN_MAX_COUNT, &dev->flags); } } - - return 0; } -void w1_search_process(struct w1_master *dev, u8 search_type) +void w1_search_process_cb(struct w1_master *dev, u8 search_type, + w1_slave_found_callback cb) { struct w1_slave *sl, *sln; + mutex_lock(&dev->list_mutex); list_for_each_entry(sl, &dev->slist, w1_slave_entry) - clear_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags); + clear_bit(W1_SLAVE_ACTIVE, &sl->flags); + mutex_unlock(&dev->list_mutex); - w1_search_devices(dev, search_type, w1_slave_found); + w1_search_devices(dev, search_type, cb); + mutex_lock(&dev->list_mutex); list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) { - if (!test_bit(W1_SLAVE_ACTIVE, (unsigned long *)&sl->flags) && !--sl->ttl) + if (!test_bit(W1_SLAVE_ACTIVE, &sl->flags) && !--sl->ttl) { + mutex_unlock(&dev->list_mutex); w1_slave_detach(sl); - else if (test_bit(W1_SLAVE_ACTIVE, (unsigned long *)&sl->flags)) + mutex_lock(&dev->list_mutex); + } + else if (test_bit(W1_SLAVE_ACTIVE, &sl->flags)) sl->ttl = dev->slave_ttl; } + mutex_unlock(&dev->list_mutex); if (dev->search_count > 0) dev->search_count--; } +static void w1_search_process(struct w1_master *dev, u8 search_type) +{ + w1_search_process_cb(dev, search_type, w1_slave_found); +} + +/** + * w1_process_callbacks() - execute each dev->async_list callback entry + * @dev: w1_master device + * + * The w1 master list_mutex must be held. + * + * Return: 1 if there were commands to executed 0 otherwise + */ +int w1_process_callbacks(struct w1_master *dev) +{ + int ret = 0; + struct w1_async_cmd *async_cmd, *async_n; + + /* The list can be added to in another thread, loop until it is empty */ + while (!list_empty(&dev->async_list)) { + list_for_each_entry_safe(async_cmd, async_n, &dev->async_list, + async_entry) { + /* drop the lock, if it is a search it can take a long + * time */ + mutex_unlock(&dev->list_mutex); + async_cmd->cb(dev, async_cmd); + ret = 1; + mutex_lock(&dev->list_mutex); + } + } + return ret; +} + int w1_process(void *data) { struct w1_master *dev = (struct w1_master *) data; + /* As long as w1_timeout is only set by a module parameter the sleep + * time can be calculated in jiffies once. + */ + const unsigned long jtime = msecs_to_jiffies(w1_timeout * 1000); + /* remainder if it woke up early */ + unsigned long jremain = 0; + + for (;;) { + + if (!jremain && dev->search_count) { + mutex_lock(&dev->mutex); + w1_search_process(dev, W1_SEARCH); + mutex_unlock(&dev->mutex); + } - while (!kthread_should_stop() && !test_bit(W1_MASTER_NEED_EXIT, &dev->flags)) { - try_to_freeze(); - msleep_interruptible(w1_timeout * 1000); + mutex_lock(&dev->list_mutex); + /* Note, w1_process_callback drops the lock while processing, + * but locks it again before returning. + */ + if (!w1_process_callbacks(dev) && jremain) { + /* a wake up is either to stop the thread, process + * callbacks, or search, it isn't process callbacks, so + * schedule a search. + */ + jremain = 1; + } - if (kthread_should_stop() || test_bit(W1_MASTER_NEED_EXIT, &dev->flags)) - break; + try_to_freeze(); + __set_current_state(TASK_INTERRUPTIBLE); - if (!dev->initialized) - continue; + /* hold list_mutex until after interruptible to prevent loosing + * the wakeup signal when async_cmd is added. + */ + mutex_unlock(&dev->list_mutex); - if (dev->search_count == 0) - continue; + if (kthread_should_stop()) + break; - mutex_lock(&dev->mutex); - w1_search_process(dev, W1_SEARCH); - mutex_unlock(&dev->mutex); + /* Only sleep when the search is active. */ + if (dev->search_count) { + if (!jremain) + jremain = jtime; + jremain = schedule_timeout(jremain); + } + else + schedule(); } atomic_dec(&dev->refcnt); @@ -902,7 +1158,7 @@ int w1_process(void *data) return 0; } -static int w1_init(void) +static int __init w1_init(void) { int retval; @@ -927,23 +1183,18 @@ static int w1_init(void) retval = driver_register(&w1_slave_driver); if (retval) { printk(KERN_ERR - "Failed to register master driver. err=%d.\n", + "Failed to register slave driver. err=%d.\n", retval); goto err_out_master_unregister; } - w1_control_thread = kthread_run(w1_control, NULL, "w1_control"); - if (IS_ERR(w1_control_thread)) { - retval = PTR_ERR(w1_control_thread); - printk(KERN_ERR "Failed to create control thread. err=%d\n", - retval); - goto err_out_slave_unregister; - } - return 0; +#if 0 +/* For undoing the slave register if there was a step after it. */ err_out_slave_unregister: driver_unregister(&w1_slave_driver); +#endif err_out_master_unregister: driver_unregister(&w1_master_driver); @@ -955,17 +1206,16 @@ err_out_exit_init: return retval; } -static void w1_fini(void) +static void __exit w1_fini(void) { struct w1_master *dev; + /* Set netlink removal messages and some cleanup */ list_for_each_entry(dev, &w1_masters, w1_master_entry) __w1_remove_master_device(dev); w1_fini_netlink(); - kthread_stop(w1_control_thread); - driver_unregister(&w1_slave_driver); driver_unregister(&w1_master_driver); bus_unregister(&w1_bus_type); diff --git a/drivers/w1/w1.h b/drivers/w1/w1.h index f1df5343f4a..56a49ba41d8 100644 --- a/drivers/w1/w1.h +++ b/drivers/w1/w1.h @@ -1,7 +1,7 @@ /* * w1.h * - * Copyright (c) 2004 Evgeniy Polyakov <johnpol@2ka.mipt.ru> + * Copyright (c) 2004 Evgeniy Polyakov <zbr@ioremap.net> * * * This program is free software; you can redistribute it and/or modify @@ -22,6 +22,13 @@ #ifndef __W1_H #define __W1_H +/** + * struct w1_reg_num - broken out slave device id + * + * @family: identifies the type of device + * @id: along with family is the unique device id + * @crc: checksum of the other bytes + */ struct w1_reg_num { #if defined(__LITTLE_ENDIAN_BITFIELD) @@ -46,7 +53,6 @@ struct w1_reg_num #include "w1_family.h" #define W1_MAXNAMELEN 32 -#define W1_SLAVE_DATA_SIZE 128 #define W1_SEARCH 0xF0 #define W1_ALARM_SEARCH 0xEC @@ -56,9 +62,27 @@ struct w1_reg_num #define W1_READ_ROM 0x33 #define W1_READ_PSUPPLY 0xB4 #define W1_MATCH_ROM 0x55 +#define W1_RESUME_CMD 0xA5 #define W1_SLAVE_ACTIVE 0 +#define W1_SLAVE_DETACH 1 +/** + * struct w1_slave - holds a single slave device on the bus + * + * @owner: Points to the one wire "wire" kernel module. + * @name: Device id is ascii. + * @w1_slave_entry: data for the linked list + * @reg_num: the slave id in binary + * @refcnt: reference count, delete when 0 + * @flags: bit flags for W1_SLAVE_ACTIVE W1_SLAVE_DETACH + * @ttl: decrement per search this slave isn't found, deatch at 0 + * @master: bus which this slave is on + * @family: module for device family type + * @family_data: pointer for use by the family module + * @dev: kernel device identifier + * + */ struct w1_slave { struct module *owner; @@ -66,111 +90,166 @@ struct w1_slave struct list_head w1_slave_entry; struct w1_reg_num reg_num; atomic_t refcnt; - u8 rom[9]; - u32 flags; int ttl; + unsigned long flags; struct w1_master *master; struct w1_family *family; void *family_data; struct device dev; - struct completion released; }; -typedef void (* w1_slave_found_callback)(void *, u64); +typedef void (*w1_slave_found_callback)(struct w1_master *, u64); /** + * struct w1_bus_master - operations available on a bus master + * + * @data: the first parameter in all the functions below + * + * @read_bit: Sample the line level @return the level read (0 or 1) + * + * @write_bit: Sets the line level + * + * @touch_bit: the lowest-level function for devices that really support the + * 1-wire protocol. + * touch_bit(0) = write-0 cycle + * touch_bit(1) = write-1 / read cycle + * @return the bit read (0 or 1) + * + * @read_byte: Reads a bytes. Same as 8 touch_bit(1) calls. + * @return the byte read + * + * @write_byte: Writes a byte. Same as 8 touch_bit(x) calls. + * + * @read_block: Same as a series of read_byte() calls + * @return the number of bytes read + * + * @write_block: Same as a series of write_byte() calls + * + * @triplet: Combines two reads and a smart write for ROM searches + * @return bit0=Id bit1=comp_id bit2=dir_taken + * + * @reset_bus: long write-0 with a read for the presence pulse detection + * @return -1=Error, 0=Device present, 1=No device present + * + * @set_pullup: Put out a strong pull-up pulse of the specified duration. + * @return -1=Error, 0=completed + * + * @search: Really nice hardware can handles the different types of ROM search + * w1_master* is passed to the slave found callback. + * u8 is search_type, W1_SEARCH or W1_ALARM_SEARCH + * * Note: read_bit and write_bit are very low level functions and should only * be used with hardware that doesn't really support 1-wire operations, * like a parallel/serial port. * Either define read_bit and write_bit OR define, at minimum, touch_bit and * reset_bus. + * */ struct w1_bus_master { - /** the first parameter in all the functions below */ void *data; - /** - * Sample the line level - * @return the level read (0 or 1) - */ u8 (*read_bit)(void *); - /** Sets the line level */ void (*write_bit)(void *, u8); - /** - * touch_bit is the lowest-level function for devices that really - * support the 1-wire protocol. - * touch_bit(0) = write-0 cycle - * touch_bit(1) = write-1 / read cycle - * @return the bit read (0 or 1) - */ u8 (*touch_bit)(void *, u8); - /** - * Reads a bytes. Same as 8 touch_bit(1) calls. - * @return the byte read - */ u8 (*read_byte)(void *); - /** - * Writes a byte. Same as 8 touch_bit(x) calls. - */ void (*write_byte)(void *, u8); - /** - * Same as a series of read_byte() calls - * @return the number of bytes read - */ u8 (*read_block)(void *, u8 *, int); - /** Same as a series of write_byte() calls */ void (*write_block)(void *, const u8 *, int); - /** - * Combines two reads and a smart write for ROM searches - * @return bit0=Id bit1=comp_id bit2=dir_taken - */ u8 (*triplet)(void *, u8); - /** - * long write-0 with a read for the presence pulse detection - * @return -1=Error, 0=Device present, 1=No device present - */ u8 (*reset_bus)(void *); - /** Really nice hardware can handles the different types of ROM search */ - void (*search)(void *, u8, w1_slave_found_callback); + u8 (*set_pullup)(void *, int); + + void (*search)(void *, struct w1_master *, + u8, w1_slave_found_callback); }; -#define W1_MASTER_NEED_EXIT 0 -#define W1_MASTER_NEED_RECONNECT 1 +/** + * enum w1_master_flags - bitfields used in w1_master.flags + * @W1_ABORT_SEARCH: abort searching early on shutdown + * @W1_WARN_MAX_COUNT: limit warning when the maximum count is reached + */ +enum w1_master_flags { + W1_ABORT_SEARCH = 0, + W1_WARN_MAX_COUNT = 1, +}; +/** + * struct w1_master - one per bus master + * @w1_master_entry: master linked list + * @owner: module owner + * @name: dynamically allocate bus name + * @list_mutex: protect slist and async_list + * @slist: linked list of slaves + * @async_list: linked list of netlink commands to execute + * @max_slave_count: maximum number of slaves to search for at a time + * @slave_count: current number of slaves known + * @attempts: number of searches ran + * @slave_ttl: number of searches before a slave is timed out + * @initialized: prevent init/removal race conditions + * @id: w1 bus number + * @search_count: number of automatic searches to run, -1 unlimited + * @search_id: allows continuing a search + * @refcnt: reference count + * @priv: private data storage + * @enable_pullup: allows a strong pullup + * @pullup_duration: time for the next strong pullup + * @flags: one of w1_master_flags + * @thread: thread for bus search and netlink commands + * @mutex: protect most of w1_master + * @bus_mutex: pretect concurrent bus access + * @driver: sysfs driver + * @dev: sysfs device + * @bus_master: io operations available + * @seq: sequence number used for netlink broadcasts + */ struct w1_master { struct list_head w1_master_entry; struct module *owner; unsigned char name[W1_MAXNAMELEN]; + /* list_mutex protects just slist and async_list so slaves can be + * searched for and async commands added while the master has + * w1_master.mutex locked and is operating on the bus. + * lock order w1_mlock, w1_master.mutex, w1_master.list_mutex + */ + struct mutex list_mutex; struct list_head slist; + struct list_head async_list; int max_slave_count, slave_count; unsigned long attempts; int slave_ttl; int initialized; u32 id; int search_count; + /* id to start searching on, to continue a search or 0 to restart */ + u64 search_id; atomic_t refcnt; void *priv; - int priv_size; + + /** 5V strong pullup enabled flag, 1 enabled, zero disabled. */ + int enable_pullup; + /** 5V strong pullup duration in milliseconds, zero disabled. */ + int pullup_duration; long flags; struct task_struct *thread; struct mutex mutex; + struct mutex bus_mutex; struct device_driver *driver; struct device dev; @@ -180,20 +259,57 @@ struct w1_master u32 seq; }; +/** + * struct w1_async_cmd - execute callback from the w1_process kthread + * @async_entry: link entry + * @cb: callback function, must list_del and destroy this list before + * returning + * + * When inserted into the w1_master async_list, w1_process will execute + * the callback. Embed this into the structure with the command details. + */ +struct w1_async_cmd { + struct list_head async_entry; + void (*cb)(struct w1_master *dev, struct w1_async_cmd *async_cmd); +}; + int w1_create_master_attributes(struct w1_master *); +void w1_destroy_master_attributes(struct w1_master *master); void w1_search(struct w1_master *dev, u8 search_type, w1_slave_found_callback cb); void w1_search_devices(struct w1_master *dev, u8 search_type, w1_slave_found_callback cb); +/* call w1_unref_slave to release the reference counts w1_search_slave added */ struct w1_slave *w1_search_slave(struct w1_reg_num *id); -void w1_search_process(struct w1_master *dev, u8 search_type); +/* decrements the reference on sl->master and sl, and cleans up if zero + * returns the reference count after it has been decremented */ +int w1_unref_slave(struct w1_slave *sl); +void w1_slave_found(struct w1_master *dev, u64 rn); +void w1_search_process_cb(struct w1_master *dev, u8 search_type, + w1_slave_found_callback cb); +struct w1_slave *w1_slave_search_device(struct w1_master *dev, + struct w1_reg_num *rn); struct w1_master *w1_search_master_id(u32 id); +/* Disconnect and reconnect devices in the given family. Used for finding + * unclaimed devices after a family has been registered or releasing devices + * after a family has been unregistered. Set attach to 1 when a new family + * has just been registered, to 0 when it has been unregistered. + */ +void w1_reconnect_slaves(struct w1_family *f, int attach); +int w1_attach_slave_device(struct w1_master *dev, struct w1_reg_num *rn); +/* 0 success, otherwise EBUSY */ +int w1_slave_detach(struct w1_slave *sl); + u8 w1_triplet(struct w1_master *dev, int bdir); void w1_write_8(struct w1_master *, u8); +u8 w1_read_8(struct w1_master *); int w1_reset_bus(struct w1_master *); u8 w1_calc_crc8(u8 *, int); void w1_write_block(struct w1_master *, const u8 *, int); +void w1_touch_block(struct w1_master *, u8 *, int); u8 w1_read_block(struct w1_master *, u8 *, int); int w1_reset_select_slave(struct w1_slave *sl); +int w1_reset_resume_command(struct w1_master *); +void w1_next_pullup(struct w1_master *, int); static inline struct w1_slave* dev_to_w1_slave(struct device *dev) { @@ -217,6 +333,7 @@ extern int w1_max_slave_ttl; extern struct list_head w1_masters; extern struct mutex w1_mlock; +extern int w1_process_callbacks(struct w1_master *dev); extern int w1_process(void *); #endif /* __KERNEL__ */ diff --git a/drivers/w1/w1_family.c b/drivers/w1/w1_family.c index a3c95bd6890..3651ec801f4 100644 --- a/drivers/w1/w1_family.c +++ b/drivers/w1/w1_family.c @@ -1,7 +1,7 @@ /* * w1_family.c * - * Copyright (c) 2004 Evgeniy Polyakov <johnpol@2ka.mipt.ru> + * Copyright (c) 2004 Evgeniy Polyakov <zbr@ioremap.net> * * * This program is free software; you can redistribute it and/or modify @@ -23,6 +23,7 @@ #include <linux/list.h> #include <linux/sched.h> /* schedule_timeout() */ #include <linux/delay.h> +#include <linux/export.h> #include "w1_family.h" #include "w1.h" @@ -30,6 +31,10 @@ DEFINE_SPINLOCK(w1_flock); static LIST_HEAD(w1_families); +/** + * w1_register_family() - register a device family driver + * @newf: family to register + */ int w1_register_family(struct w1_family *newf) { struct list_head *ent, *n; @@ -48,16 +53,20 @@ int w1_register_family(struct w1_family *newf) if (!ret) { atomic_set(&newf->refcnt, 0); - newf->need_exit = 0; list_add_tail(&newf->family_entry, &w1_families); } spin_unlock(&w1_flock); - w1_reconnect_slaves(newf); + /* check default devices against the new set of drivers */ + w1_reconnect_slaves(newf, 1); return ret; } +/** + * w1_unregister_family() - unregister a device family driver + * @fent: family to unregister + */ void w1_unregister_family(struct w1_family *fent) { struct list_head *ent, *n; @@ -72,11 +81,11 @@ void w1_unregister_family(struct w1_family *fent) break; } } - - fent->need_exit = 1; - spin_unlock(&w1_flock); + /* deatch devices using this family code */ + w1_reconnect_slaves(fent, 0); + while (atomic_read(&fent->refcnt)) { printk(KERN_INFO "Waiting for family %u to become free: refcnt=%d.\n", fent->fid, atomic_read(&fent->refcnt)); @@ -109,8 +118,7 @@ struct w1_family * w1_family_registered(u8 fid) static void __w1_family_put(struct w1_family *f) { - if (atomic_dec_and_test(&f->refcnt)) - f->need_exit = 1; + atomic_dec(&f->refcnt); } void w1_family_put(struct w1_family *f) @@ -131,9 +139,9 @@ void w1_family_get(struct w1_family *f) void __w1_family_get(struct w1_family *f) { - smp_mb__before_atomic_inc(); + smp_mb__before_atomic(); atomic_inc(&f->refcnt); - smp_mb__after_atomic_inc(); + smp_mb__after_atomic(); } EXPORT_SYMBOL(w1_unregister_family); diff --git a/drivers/w1/w1_family.h b/drivers/w1/w1_family.h index ef1e1dafa19..26ca1343055 100644 --- a/drivers/w1/w1_family.h +++ b/drivers/w1/w1_family.h @@ -1,7 +1,7 @@ /* * w1_family.h * - * Copyright (c) 2004 Evgeniy Polyakov <johnpol@2ka.mipt.ru> + * Copyright (c) 2004 Evgeniy Polyakov <zbr@ioremap.net> * * * This program is free software; you can redistribute it and/or modify @@ -24,27 +24,50 @@ #include <linux/types.h> #include <linux/device.h> -#include <asm/atomic.h> +#include <linux/atomic.h> #define W1_FAMILY_DEFAULT 0 #define W1_FAMILY_SMEM_01 0x01 #define W1_FAMILY_SMEM_81 0x81 #define W1_THERM_DS18S20 0x10 +#define W1_FAMILY_DS28E04 0x1C +#define W1_COUNTER_DS2423 0x1D #define W1_THERM_DS1822 0x22 #define W1_EEPROM_DS2433 0x23 #define W1_THERM_DS18B20 0x28 +#define W1_FAMILY_DS2408 0x29 +#define W1_EEPROM_DS2431 0x2D #define W1_FAMILY_DS2760 0x30 +#define W1_FAMILY_DS2780 0x32 +#define W1_FAMILY_DS2413 0x3A +#define W1_THERM_DS1825 0x3B +#define W1_FAMILY_DS2781 0x3D +#define W1_THERM_DS28EA00 0x42 #define MAXNAMELEN 32 struct w1_slave; +/** + * struct w1_family_ops - operations for a family type + * @add_slave: add_slave + * @remove_slave: remove_slave + * @groups: sysfs group + */ struct w1_family_ops { int (* add_slave)(struct w1_slave *); void (* remove_slave)(struct w1_slave *); + const struct attribute_group **groups; }; +/** + * struct w1_family - reference counted family structure. + * @family_entry: family linked list + * @fid: 8 bit family identifier + * @fops: operations for this family + * @refcnt: reference counter + */ struct w1_family { struct list_head family_entry; @@ -53,7 +76,6 @@ struct w1_family struct w1_family_ops *fops; atomic_t refcnt; - u8 need_exit; }; extern spinlock_t w1_flock; @@ -63,6 +85,5 @@ void __w1_family_get(struct w1_family *); struct w1_family * w1_family_registered(u8); void w1_unregister_family(struct w1_family *); int w1_register_family(struct w1_family *); -void w1_reconnect_slaves(struct w1_family *f); #endif /* __W1_FAMILY_H */ diff --git a/drivers/w1/w1_int.c b/drivers/w1/w1_int.c index 6840dfebe4d..728039d2efe 100644 --- a/drivers/w1/w1_int.c +++ b/drivers/w1/w1_int.c @@ -1,7 +1,7 @@ /* * w1_int.c * - * Copyright (c) 2004 Evgeniy Polyakov <johnpol@2ka.mipt.ru> + * Copyright (c) 2004 Evgeniy Polyakov <zbr@ioremap.net> * * * This program is free software; you can redistribute it and/or modify @@ -23,13 +23,20 @@ #include <linux/list.h> #include <linux/delay.h> #include <linux/kthread.h> +#include <linux/slab.h> +#include <linux/export.h> +#include <linux/moduleparam.h> #include "w1.h" #include "w1_log.h" #include "w1_netlink.h" #include "w1_int.h" -static u32 w1_ids = 1; +static int w1_search_count = -1; /* Default is continual scan */ +module_param_named(search_count, w1_search_count, int, 0); + +static int w1_enable_pullup = 1; +module_param_named(enable_pullup, w1_enable_pullup, int, 0); static struct w1_master * w1_alloc_dev(u32 id, int slave_count, int slave_ttl, struct device_driver *driver, @@ -59,17 +66,24 @@ static struct w1_master * w1_alloc_dev(u32 id, int slave_count, int slave_ttl, dev->initialized = 0; dev->id = id; dev->slave_ttl = slave_ttl; - dev->search_count = -1; /* continual scan */ + dev->search_count = w1_search_count; + dev->enable_pullup = w1_enable_pullup; + /* 1 for w1_process to decrement + * 1 for __w1_remove_master_device to decrement + */ atomic_set(&dev->refcnt, 2); INIT_LIST_HEAD(&dev->slist); + INIT_LIST_HEAD(&dev->async_list); mutex_init(&dev->mutex); + mutex_init(&dev->bus_mutex); + mutex_init(&dev->list_mutex); memcpy(&dev->dev, device, sizeof(struct device)); - snprintf(dev->dev.bus_id, sizeof(dev->dev.bus_id), - "w1_bus_master%u", dev->id); + dev_set_name(&dev->dev, "w1_bus_master%u", dev->id); snprintf(dev->name, sizeof(dev->name), "w1_bus_master%u", dev->id); + dev->dev.init_name = dev->name; dev->driver = driver; @@ -91,11 +105,16 @@ static void w1_free_dev(struct w1_master *dev) device_unregister(&dev->dev); } +/** + * w1_add_master_device() - registers a new master device + * @master: master bus device to register + */ int w1_add_master_device(struct w1_bus_master *master) { - struct w1_master *dev; + struct w1_master *dev, *entry; int retval = 0; struct w1_netlink_msg msg; + int id, found; /* validate minimum functionality */ if (!(master->touch_bit && master->reset_bus) && @@ -105,9 +124,37 @@ int w1_add_master_device(struct w1_bus_master *master) return(-EINVAL); } - dev = w1_alloc_dev(w1_ids++, w1_max_slave_count, w1_max_slave_ttl, &w1_master_driver, &w1_master_device); - if (!dev) + /* Lock until the device is added (or not) to w1_masters. */ + mutex_lock(&w1_mlock); + /* Search for the first available id (starting at 1). */ + id = 0; + do { + ++id; + found = 0; + list_for_each_entry(entry, &w1_masters, w1_master_entry) { + if (entry->id == id) { + found = 1; + break; + } + } + } while (found); + + dev = w1_alloc_dev(id, w1_max_slave_count, w1_max_slave_ttl, + &w1_master_driver, &w1_master_device); + if (!dev) { + mutex_unlock(&w1_mlock); return -ENOMEM; + } + + retval = w1_create_master_attributes(dev); + if (retval) { + mutex_unlock(&w1_mlock); + goto err_out_free_dev; + } + + memcpy(dev->bus_master, master, sizeof(struct w1_bus_master)); + + dev->initialized = 1; dev->thread = kthread_run(&w1_process, dev, "%s", dev->name); if (IS_ERR(dev->thread)) { @@ -115,18 +162,10 @@ int w1_add_master_device(struct w1_bus_master *master) dev_err(&dev->dev, "Failed to create new kernel thread. err=%d\n", retval); - goto err_out_free_dev; + mutex_unlock(&w1_mlock); + goto err_out_rm_attr; } - retval = w1_create_master_attributes(dev); - if (retval) - goto err_out_kill_thread; - - memcpy(dev->bus_master, master, sizeof(struct w1_bus_master)); - - dev->initialized = 1; - - mutex_lock(&w1_mlock); list_add(&dev->w1_master_entry, &w1_masters); mutex_unlock(&w1_mlock); @@ -137,8 +176,13 @@ int w1_add_master_device(struct w1_bus_master *master) return 0; +#if 0 /* Thread cleanup code, not required currently. */ err_out_kill_thread: + set_bit(W1_ABORT_SEARCH, &dev->flags); kthread_stop(dev->thread); +#endif +err_out_rm_attr: + w1_destroy_master_attributes(dev); err_out_free_dev: w1_free_dev(dev); @@ -148,17 +192,40 @@ err_out_free_dev: void __w1_remove_master_device(struct w1_master *dev) { struct w1_netlink_msg msg; + struct w1_slave *sl, *sln; + + mutex_lock(&w1_mlock); + list_del(&dev->w1_master_entry); + mutex_unlock(&w1_mlock); - set_bit(W1_MASTER_NEED_EXIT, &dev->flags); + set_bit(W1_ABORT_SEARCH, &dev->flags); kthread_stop(dev->thread); + mutex_lock(&dev->mutex); + mutex_lock(&dev->list_mutex); + list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) { + mutex_unlock(&dev->list_mutex); + w1_slave_detach(sl); + mutex_lock(&dev->list_mutex); + } + w1_destroy_master_attributes(dev); + mutex_unlock(&dev->list_mutex); + mutex_unlock(&dev->mutex); + atomic_dec(&dev->refcnt); + while (atomic_read(&dev->refcnt)) { dev_info(&dev->dev, "Waiting for %s to become free: refcnt=%d.\n", dev->name, atomic_read(&dev->refcnt)); if (msleep_interruptible(1000)) flush_signals(current); + mutex_lock(&dev->list_mutex); + w1_process_callbacks(dev); + mutex_unlock(&dev->list_mutex); } + mutex_lock(&dev->list_mutex); + w1_process_callbacks(dev); + mutex_unlock(&dev->list_mutex); memset(&msg, 0, sizeof(msg)); msg.id.mst.id = dev->id; @@ -168,6 +235,10 @@ void __w1_remove_master_device(struct w1_master *dev) w1_free_dev(dev); } +/** + * w1_remove_master_device() - unregister a master device + * @bm: master bus device to remove + */ void w1_remove_master_device(struct w1_bus_master *bm) { struct w1_master *dev, *found = NULL; diff --git a/drivers/w1/w1_int.h b/drivers/w1/w1_int.h index 4274082d226..2ad7d4414be 100644 --- a/drivers/w1/w1_int.h +++ b/drivers/w1/w1_int.h @@ -1,7 +1,7 @@ /* * w1_int.h * - * Copyright (c) 2004 Evgeniy Polyakov <johnpol@2ka.mipt.ru> + * Copyright (c) 2004 Evgeniy Polyakov <zbr@ioremap.net> * * * This program is free software; you can redistribute it and/or modify diff --git a/drivers/w1/w1_io.c b/drivers/w1/w1_io.c index 30b6fbf83bd..282092421cc 100644 --- a/drivers/w1/w1_io.c +++ b/drivers/w1/w1_io.c @@ -1,7 +1,7 @@ /* * w1_io.c * - * Copyright (c) 2004 Evgeniy Polyakov <johnpol@2ka.mipt.ru> + * Copyright (c) 2004 Evgeniy Polyakov <zbr@ioremap.net> * * * This program is free software; you can redistribute it and/or modify @@ -31,6 +31,9 @@ static int w1_delay_parm = 1; module_param_named(delay_coef, w1_delay_parm, int, 0); +static int w1_disable_irqs = 0; +module_param_named(disable_irqs, w1_disable_irqs, int, 0); + static u8 w1_crc8_table[] = { 0, 94, 188, 226, 97, 63, 221, 131, 194, 156, 126, 32, 163, 253, 31, 65, 157, 195, 33, 127, 252, 162, 64, 30, 95, 1, 227, 189, 62, 96, 130, 220, @@ -59,7 +62,9 @@ static void w1_write_bit(struct w1_master *dev, int bit); static u8 w1_read_bit(struct w1_master *dev); /** - * Generates a write-0 or write-1 cycle and samples the level. + * w1_touch_bit() - Generates a write-0 or write-1 cycle and samples the level. + * @dev: the master device + * @bit: 0 - write a 0, 1 - write a 0 read the level */ static u8 w1_touch_bit(struct w1_master *dev, int bit) { @@ -69,16 +74,23 @@ static u8 w1_touch_bit(struct w1_master *dev, int bit) return w1_read_bit(dev); else { w1_write_bit(dev, 0); - return(0); + return 0; } } /** - * Generates a write-0 or write-1 cycle. + * w1_write_bit() - Generates a write-0 or write-1 cycle. + * @dev: the master device + * @bit: bit to write + * * Only call if dev->bus_master->touch_bit is NULL */ static void w1_write_bit(struct w1_master *dev, int bit) { + unsigned long flags = 0; + + if(w1_disable_irqs) local_irq_save(flags); + if (bit) { dev->bus_master->write_bit(dev->bus_master->data, 0); w1_delay(6); @@ -90,71 +102,122 @@ static void w1_write_bit(struct w1_master *dev, int bit) dev->bus_master->write_bit(dev->bus_master->data, 1); w1_delay(10); } + + if(w1_disable_irqs) local_irq_restore(flags); +} + +/** + * w1_pre_write() - pre-write operations + * @dev: the master device + * + * Pre-write operation, currently only supporting strong pullups. + * Program the hardware for a strong pullup, if one has been requested and + * the hardware supports it. + */ +static void w1_pre_write(struct w1_master *dev) +{ + if (dev->pullup_duration && + dev->enable_pullup && dev->bus_master->set_pullup) { + dev->bus_master->set_pullup(dev->bus_master->data, + dev->pullup_duration); + } } /** - * Writes 8 bits. + * w1_post_write() - post-write options + * @dev: the master device * - * @param dev the master device - * @param byte the byte to write + * Post-write operation, currently only supporting strong pullups. + * If a strong pullup was requested, clear it if the hardware supports + * them, or execute the delay otherwise, in either case clear the request. + */ +static void w1_post_write(struct w1_master *dev) +{ + if (dev->pullup_duration) { + if (dev->enable_pullup && dev->bus_master->set_pullup) + dev->bus_master->set_pullup(dev->bus_master->data, 0); + else + msleep(dev->pullup_duration); + dev->pullup_duration = 0; + } +} + +/** + * w1_write_8() - Writes 8 bits. + * @dev: the master device + * @byte: the byte to write */ void w1_write_8(struct w1_master *dev, u8 byte) { int i; - if (dev->bus_master->write_byte) + if (dev->bus_master->write_byte) { + w1_pre_write(dev); dev->bus_master->write_byte(dev->bus_master->data, byte); + } else - for (i = 0; i < 8; ++i) + for (i = 0; i < 8; ++i) { + if (i == 7) + w1_pre_write(dev); w1_touch_bit(dev, (byte >> i) & 0x1); + } + w1_post_write(dev); } EXPORT_SYMBOL_GPL(w1_write_8); /** - * Generates a write-1 cycle and samples the level. + * w1_read_bit() - Generates a write-1 cycle and samples the level. + * @dev: the master device + * * Only call if dev->bus_master->touch_bit is NULL */ static u8 w1_read_bit(struct w1_master *dev) { int result; + unsigned long flags = 0; + /* sample timing is critical here */ + local_irq_save(flags); dev->bus_master->write_bit(dev->bus_master->data, 0); w1_delay(6); dev->bus_master->write_bit(dev->bus_master->data, 1); w1_delay(9); result = dev->bus_master->read_bit(dev->bus_master->data); + local_irq_restore(flags); + w1_delay(55); return result & 0x1; } /** - * Does a triplet - used for searching ROM addresses. + * w1_triplet() - * Does a triplet - used for searching ROM addresses. + * @dev: the master device + * @bdir: the bit to write if both id_bit and comp_bit are 0 + * * Return bits: * bit 0 = id_bit * bit 1 = comp_bit * bit 2 = dir_taken * If both bits 0 & 1 are set, the search should be restarted. * - * @param dev the master device - * @param bdir the bit to write if both id_bit and comp_bit are 0 - * @return bit fields - see above + * Return: bit fields - see above */ u8 w1_triplet(struct w1_master *dev, int bdir) { - if ( dev->bus_master->triplet ) - return(dev->bus_master->triplet(dev->bus_master->data, bdir)); + if (dev->bus_master->triplet) + return dev->bus_master->triplet(dev->bus_master->data, bdir); else { u8 id_bit = w1_touch_bit(dev, 1); u8 comp_bit = w1_touch_bit(dev, 1); u8 retval; - if ( id_bit && comp_bit ) - return(0x03); /* error */ + if (id_bit && comp_bit) + return 0x03; /* error */ - if ( !id_bit && !comp_bit ) { + if (!id_bit && !comp_bit) { /* Both bits are valid, take the direction given */ retval = bdir ? 0x04 : 0; } else { @@ -163,21 +226,21 @@ u8 w1_triplet(struct w1_master *dev, int bdir) retval = id_bit ? 0x05 : 0x02; } - if ( dev->bus_master->touch_bit ) + if (dev->bus_master->touch_bit) w1_touch_bit(dev, bdir); else w1_write_bit(dev, bdir); - return(retval); + return retval; } } /** - * Reads 8 bits. + * w1_read_8() - Reads 8 bits. + * @dev: the master device * - * @param dev the master device - * @return the byte read + * Return: the byte read */ -static u8 w1_read_8(struct w1_master * dev) +u8 w1_read_8(struct w1_master *dev) { int i; u8 res = 0; @@ -190,34 +253,59 @@ static u8 w1_read_8(struct w1_master * dev) return res; } +EXPORT_SYMBOL_GPL(w1_read_8); /** - * Writes a series of bytes. - * - * @param dev the master device - * @param buf pointer to the data to write - * @param len the number of bytes to write - * @return the byte read + * w1_write_block() - Writes a series of bytes. + * @dev: the master device + * @buf: pointer to the data to write + * @len: the number of bytes to write */ void w1_write_block(struct w1_master *dev, const u8 *buf, int len) { int i; - if (dev->bus_master->write_block) + if (dev->bus_master->write_block) { + w1_pre_write(dev); dev->bus_master->write_block(dev->bus_master->data, buf, len); + } else for (i = 0; i < len; ++i) - w1_write_8(dev, buf[i]); + w1_write_8(dev, buf[i]); /* calls w1_pre_write */ + w1_post_write(dev); } EXPORT_SYMBOL_GPL(w1_write_block); /** - * Reads a series of bytes. - * - * @param dev the master device - * @param buf pointer to the buffer to fill - * @param len the number of bytes to read - * @return the number of bytes read + * w1_touch_block() - Touches a series of bytes. + * @dev: the master device + * @buf: pointer to the data to write + * @len: the number of bytes to write + */ +void w1_touch_block(struct w1_master *dev, u8 *buf, int len) +{ + int i, j; + u8 tmp; + + for (i = 0; i < len; ++i) { + tmp = 0; + for (j = 0; j < 8; ++j) { + if (j == 7) + w1_pre_write(dev); + tmp |= w1_touch_bit(dev, (buf[i] >> j) & 0x1) << j; + } + + buf[i] = tmp; + } +} +EXPORT_SYMBOL_GPL(w1_touch_block); + +/** + * w1_read_block() - Reads a series of bytes. + * @dev: the master device + * @buf: pointer to the buffer to fill + * @len: the number of bytes to read + * Return: the number of bytes read */ u8 w1_read_block(struct w1_master *dev, u8 *buf, int len) { @@ -237,27 +325,43 @@ u8 w1_read_block(struct w1_master *dev, u8 *buf, int len) EXPORT_SYMBOL_GPL(w1_read_block); /** - * Issues a reset bus sequence. - * - * @param dev The bus master pointer - * @return 0=Device present, 1=No device present or error + * w1_reset_bus() - Issues a reset bus sequence. + * @dev: the master device + * Return: 0=Device present, 1=No device present or error */ int w1_reset_bus(struct w1_master *dev) { int result; + unsigned long flags = 0; + + if(w1_disable_irqs) local_irq_save(flags); if (dev->bus_master->reset_bus) result = dev->bus_master->reset_bus(dev->bus_master->data) & 0x1; else { dev->bus_master->write_bit(dev->bus_master->data, 0); - w1_delay(480); + /* minimum 480, max ? us + * be nice and sleep, except 18b20 spec lists 960us maximum, + * so until we can sleep with microsecond accuracy, spin. + * Feel free to come up with some other way to give up the + * cpu for such a short amount of time AND get it back in + * the maximum amount of time. + */ + w1_delay(500); dev->bus_master->write_bit(dev->bus_master->data, 1); w1_delay(70); result = dev->bus_master->read_bit(dev->bus_master->data) & 0x1; - w1_delay(410); + /* minmum 70 (above) + 430 = 500 us + * There aren't any timing requirements between a reset and + * the following transactions. Sleeping is safe here. + */ + /* w1_delay(430); min required time */ + msleep(1); } + if(w1_disable_irqs) local_irq_restore(flags); + return result; } EXPORT_SYMBOL_GPL(w1_reset_bus); @@ -277,18 +381,22 @@ void w1_search_devices(struct w1_master *dev, u8 search_type, w1_slave_found_cal { dev->attempts++; if (dev->bus_master->search) - dev->bus_master->search(dev->bus_master->data, search_type, cb); + dev->bus_master->search(dev->bus_master->data, dev, + search_type, cb); else w1_search(dev, search_type, cb); } /** + * w1_reset_select_slave() - reset and select a slave + * @sl: the slave to select + * * Resets the bus and then selects the slave by sending either a skip rom - * or a rom match. + * or a rom match. A skip rom is issued if there is only one device + * registered on the bus. * The w1 master lock must be held. * - * @param sl the slave to select - * @return 0=success, anything else=error + * Return: 0=success, anything else=error */ int w1_reset_select_slave(struct w1_slave *sl) { @@ -299,9 +407,58 @@ int w1_reset_select_slave(struct w1_slave *sl) w1_write_8(sl->master, W1_SKIP_ROM); else { u8 match[9] = {W1_MATCH_ROM, }; - memcpy(&match[1], (u8 *)&sl->reg_num, 8); + u64 rn = le64_to_cpu(*((u64*)&sl->reg_num)); + + memcpy(&match[1], &rn, 8); w1_write_block(sl->master, match, 9); } return 0; } EXPORT_SYMBOL_GPL(w1_reset_select_slave); + +/** + * w1_reset_resume_command() - resume instead of another match ROM + * @dev: the master device + * + * When the workflow with a slave amongst many requires several + * successive commands a reset between each, this function is similar + * to doing a reset then a match ROM for the last matched ROM. The + * advantage being that the matched ROM step is skipped in favor of the + * resume command. The slave must support the command of course. + * + * If the bus has only one slave, traditionnaly the match ROM is skipped + * and a "SKIP ROM" is done for efficiency. On multi-slave busses, this + * doesn't work of course, but the resume command is the next best thing. + * + * The w1 master lock must be held. + */ +int w1_reset_resume_command(struct w1_master *dev) +{ + if (w1_reset_bus(dev)) + return -1; + + /* This will make only the last matched slave perform a skip ROM. */ + w1_write_8(dev, W1_RESUME_CMD); + return 0; +} +EXPORT_SYMBOL_GPL(w1_reset_resume_command); + +/** + * w1_next_pullup() - register for a strong pullup + * @dev: the master device + * @delay: time in milliseconds + * + * Put out a strong pull-up of the specified duration after the next write + * operation. Not all hardware supports strong pullups. Hardware that + * doesn't support strong pullups will sleep for the given time after the + * write operation without a strong pullup. This is a one shot request for + * the next write, specifying zero will clear a previous request. + * The w1 master lock must be held. + * + * Return: 0=success, anything else=error + */ +void w1_next_pullup(struct w1_master *dev, int delay) +{ + dev->pullup_duration = delay; +} +EXPORT_SYMBOL_GPL(w1_next_pullup); diff --git a/drivers/w1/w1_log.h b/drivers/w1/w1_log.h index fe6bdf43380..9c7bd62e6bd 100644 --- a/drivers/w1/w1_log.h +++ b/drivers/w1/w1_log.h @@ -1,7 +1,7 @@ /* * w1_log.h * - * Copyright (c) 2004 Evgeniy Polyakov <johnpol@2ka.mipt.ru> + * Copyright (c) 2004 Evgeniy Polyakov <zbr@ioremap.net> * * * This program is free software; you can redistribute it and/or modify @@ -30,7 +30,7 @@ # define assert(expr) \ if(unlikely(!(expr))) { \ printk(KERN_ERR "Assertion failed! %s,%s,%s,line=%d\n", \ - #expr,__FILE__,__FUNCTION__,__LINE__); \ + #expr, __FILE__, __func__, __LINE__); \ } #endif diff --git a/drivers/w1/w1_netlink.c b/drivers/w1/w1_netlink.c index 65c5ebd0787..351a2978ba7 100644 --- a/drivers/w1/w1_netlink.c +++ b/drivers/w1/w1_netlink.c @@ -1,7 +1,7 @@ /* * w1_netlink.c * - * Copyright (c) 2003 Evgeniy Polyakov <johnpol@2ka.mipt.ru> + * Copyright (c) 2003 Evgeniy Polyakov <zbr@ioremap.net> * * * This program is free software; you can redistribute it and/or modify @@ -19,6 +19,7 @@ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ +#include <linux/slab.h> #include <linux/skbuff.h> #include <linux/netlink.h> #include <linux/connector.h> @@ -28,142 +29,663 @@ #include "w1_netlink.h" #if defined(CONFIG_W1_CON) && (defined(CONFIG_CONNECTOR) || (defined(CONFIG_CONNECTOR_MODULE) && defined(CONFIG_W1_MODULE))) + +#define MIN(a, b) (((a) < (b)) ? (a) : (b)) + +/* Bundle together everything required to process a request in one memory + * allocation. + */ +struct w1_cb_block { + atomic_t refcnt; + u32 portid; /* Sending process port ID */ + /* maximum value for first_cn->len */ + u16 maxlen; + /* pointers to building up the reply message */ + struct cn_msg *first_cn; /* fixed once the structure is populated */ + struct cn_msg *cn; /* advances as cn_msg is appeneded */ + struct w1_netlink_msg *msg; /* advances as w1_netlink_msg is appened */ + struct w1_netlink_cmd *cmd; /* advances as cmds are appened */ + struct w1_netlink_msg *cur_msg; /* currently message being processed */ + /* copy of the original request follows */ + struct cn_msg request_cn; + /* followed by variable length: + * cn_msg, data (w1_netlink_msg and w1_netlink_cmd) + * one or more struct w1_cb_node + * reply first_cn, data (w1_netlink_msg and w1_netlink_cmd) + */ +}; +struct w1_cb_node { + struct w1_async_cmd async; + /* pointers within w1_cb_block and cn data */ + struct w1_cb_block *block; + struct w1_netlink_msg *msg; + struct w1_slave *sl; + struct w1_master *dev; +}; + +/** + * w1_reply_len() - calculate current reply length, compare to maxlen + * @block: block to calculate + * + * Calculates the current message length including possible multiple + * cn_msg and data, excludes the first sizeof(struct cn_msg). Direclty + * compariable to maxlen and usable to send the message. + */ +static u16 w1_reply_len(struct w1_cb_block *block) +{ + if (!block->cn) + return 0; + return (u8 *)block->cn - (u8 *)block->first_cn + block->cn->len; +} + +static void w1_unref_block(struct w1_cb_block *block) +{ + if (atomic_sub_return(1, &block->refcnt) == 0) { + u16 len = w1_reply_len(block); + if (len) { + cn_netlink_send_mult(block->first_cn, len, + block->portid, 0, GFP_KERNEL); + } + kfree(block); + } +} + +/** + * w1_reply_make_space() - send message if needed to make space + * @block: block to make space on + * @space: how many bytes requested + * + * Verify there is enough room left for the caller to add "space" bytes to the + * message, if there isn't send the message and reset. + */ +static void w1_reply_make_space(struct w1_cb_block *block, u16 space) +{ + u16 len = w1_reply_len(block); + if (len + space >= block->maxlen) { + cn_netlink_send_mult(block->first_cn, len, block->portid, 0, GFP_KERNEL); + block->first_cn->len = 0; + block->cn = NULL; + block->msg = NULL; + block->cmd = NULL; + } +} + +/* Early send when replies aren't bundled. */ +static void w1_netlink_check_send(struct w1_cb_block *block) +{ + if (!(block->request_cn.flags & W1_CN_BUNDLE) && block->cn) + w1_reply_make_space(block, block->maxlen); +} + +/** + * w1_netlink_setup_msg() - prepare to write block->msg + * @block: block to operate on + * @ack: determines if cn can be reused + * + * block->cn will be setup with the correct ack, advancing if needed + * block->cn->len does not include space for block->msg + * block->msg advances but remains uninitialized + */ +static void w1_netlink_setup_msg(struct w1_cb_block *block, u32 ack) +{ + if (block->cn && block->cn->ack == ack) { + block->msg = (struct w1_netlink_msg *)(block->cn->data + block->cn->len); + } else { + /* advance or set to data */ + if (block->cn) + block->cn = (struct cn_msg *)(block->cn->data + + block->cn->len); + else + block->cn = block->first_cn; + + memcpy(block->cn, &block->request_cn, sizeof(*block->cn)); + block->cn->len = 0; + block->cn->ack = ack; + block->msg = (struct w1_netlink_msg *)block->cn->data; + } +} + +/* Append cmd to msg, include cmd->data as well. This is because + * any following data goes with the command and in the case of a read is + * the results. + */ +static void w1_netlink_queue_cmd(struct w1_cb_block *block, + struct w1_netlink_cmd *cmd) +{ + u32 space; + w1_reply_make_space(block, sizeof(struct cn_msg) + + sizeof(struct w1_netlink_msg) + sizeof(*cmd) + cmd->len); + + /* There's a status message sent after each command, so no point + * in trying to bundle this cmd after an existing one, because + * there won't be one. Allocate and copy over a new cn_msg. + */ + w1_netlink_setup_msg(block, block->request_cn.seq + 1); + memcpy(block->msg, block->cur_msg, sizeof(*block->msg)); + block->cn->len += sizeof(*block->msg); + block->msg->len = 0; + block->cmd = (struct w1_netlink_cmd *)(block->msg->data); + + space = sizeof(*cmd) + cmd->len; + if (block->cmd != cmd) + memcpy(block->cmd, cmd, space); + block->cn->len += space; + block->msg->len += space; +} + +/* Append req_msg and req_cmd, no other commands and no data from req_cmd are + * copied. + */ +static void w1_netlink_queue_status(struct w1_cb_block *block, + struct w1_netlink_msg *req_msg, struct w1_netlink_cmd *req_cmd, + int error) +{ + u16 space = sizeof(struct cn_msg) + sizeof(*req_msg) + sizeof(*req_cmd); + w1_reply_make_space(block, space); + w1_netlink_setup_msg(block, block->request_cn.ack); + + memcpy(block->msg, req_msg, sizeof(*req_msg)); + block->cn->len += sizeof(*req_msg); + block->msg->len = 0; + block->msg->status = (u8)-error; + if (req_cmd) { + struct w1_netlink_cmd *cmd = (struct w1_netlink_cmd *)block->msg->data; + memcpy(cmd, req_cmd, sizeof(*cmd)); + block->cn->len += sizeof(*cmd); + block->msg->len += sizeof(*cmd); + cmd->len = 0; + } + w1_netlink_check_send(block); +} + +/** + * w1_netlink_send_error() - sends the error message now + * @cn: original cn_msg + * @msg: original w1_netlink_msg + * @portid: where to send it + * @error: error status + * + * Use when a block isn't available to queue the message to and cn, msg + * might not be contiguous. + */ +static void w1_netlink_send_error(struct cn_msg *cn, struct w1_netlink_msg *msg, + int portid, int error) +{ + struct { + struct cn_msg cn; + struct w1_netlink_msg msg; + } packet; + memcpy(&packet.cn, cn, sizeof(packet.cn)); + memcpy(&packet.msg, msg, sizeof(packet.msg)); + packet.cn.len = sizeof(packet.msg); + packet.msg.len = 0; + packet.msg.status = (u8)-error; + cn_netlink_send(&packet.cn, portid, 0, GFP_KERNEL); +} + +/** + * w1_netlink_send() - sends w1 netlink notifications + * @dev: w1_master the even is associated with or for + * @msg: w1_netlink_msg message to be sent + * + * This are notifications generated from the kernel. + */ void w1_netlink_send(struct w1_master *dev, struct w1_netlink_msg *msg) { - char buf[sizeof(struct cn_msg) + sizeof(struct w1_netlink_msg)]; - struct cn_msg *m = (struct cn_msg *)buf; - struct w1_netlink_msg *w = (struct w1_netlink_msg *)(m+1); + struct { + struct cn_msg cn; + struct w1_netlink_msg msg; + } packet; + memset(&packet, 0, sizeof(packet)); + + packet.cn.id.idx = CN_W1_IDX; + packet.cn.id.val = CN_W1_VAL; + + packet.cn.seq = dev->seq++; + packet.cn.len = sizeof(*msg); + + memcpy(&packet.msg, msg, sizeof(*msg)); + packet.msg.len = 0; + + cn_netlink_send(&packet.cn, 0, 0, GFP_KERNEL); +} + +static void w1_send_slave(struct w1_master *dev, u64 rn) +{ + struct w1_cb_block *block = dev->priv; + struct w1_netlink_cmd *cache_cmd = block->cmd; + u64 *data; + + w1_reply_make_space(block, sizeof(*data)); - memset(buf, 0, sizeof(buf)); + /* Add cmd back if the packet was sent */ + if (!block->cmd) { + cache_cmd->len = 0; + w1_netlink_queue_cmd(block, cache_cmd); + } - m->id.idx = CN_W1_IDX; - m->id.val = CN_W1_VAL; + data = (u64 *)(block->cmd->data + block->cmd->len); - m->seq = dev->seq++; - m->len = sizeof(struct w1_netlink_msg); + *data = rn; + block->cn->len += sizeof(*data); + block->msg->len += sizeof(*data); + block->cmd->len += sizeof(*data); +} - memcpy(w, msg, sizeof(struct w1_netlink_msg)); +static void w1_found_send_slave(struct w1_master *dev, u64 rn) +{ + /* update kernel slave list */ + w1_slave_found(dev, rn); - cn_netlink_send(m, 0, GFP_KERNEL); + w1_send_slave(dev, rn); } -static int w1_process_command_master(struct w1_master *dev, struct cn_msg *msg, - struct w1_netlink_msg *hdr, struct w1_netlink_cmd *cmd) +/* Get the current slave list, or search (with or without alarm) */ +static int w1_get_slaves(struct w1_master *dev, struct w1_netlink_cmd *req_cmd) { - dev_dbg(&dev->dev, "%s: %s: cmd=%02x, len=%u.\n", - __func__, dev->name, cmd->cmd, cmd->len); + struct w1_slave *sl; - if (cmd->cmd != W1_CMD_SEARCH && cmd->cmd != W1_CMD_ALARM_SEARCH) - return -EINVAL; + req_cmd->len = 0; + w1_netlink_queue_cmd(dev->priv, req_cmd); + + if (req_cmd->cmd == W1_CMD_LIST_SLAVES) { + u64 rn; + mutex_lock(&dev->list_mutex); + list_for_each_entry(sl, &dev->slist, w1_slave_entry) { + memcpy(&rn, &sl->reg_num, sizeof(rn)); + w1_send_slave(dev, rn); + } + mutex_unlock(&dev->list_mutex); + } else { + w1_search_process_cb(dev, req_cmd->cmd == W1_CMD_ALARM_SEARCH ? + W1_ALARM_SEARCH : W1_SEARCH, w1_found_send_slave); + } - w1_search_process(dev, (cmd->cmd == W1_CMD_ALARM_SEARCH)?W1_ALARM_SEARCH:W1_SEARCH); return 0; } -static int w1_send_read_reply(struct w1_slave *sl, struct cn_msg *msg, - struct w1_netlink_msg *hdr, struct w1_netlink_cmd *cmd) +static int w1_process_command_io(struct w1_master *dev, + struct w1_netlink_cmd *cmd) { - void *data; - struct w1_netlink_msg *h; - struct w1_netlink_cmd *c; - struct cn_msg *cm; - int err; + int err = 0; - data = kzalloc(sizeof(struct cn_msg) + - sizeof(struct w1_netlink_msg) + - sizeof(struct w1_netlink_cmd) + - cmd->len, GFP_KERNEL); - if (!data) - return -ENOMEM; + switch (cmd->cmd) { + case W1_CMD_TOUCH: + w1_touch_block(dev, cmd->data, cmd->len); + w1_netlink_queue_cmd(dev->priv, cmd); + break; + case W1_CMD_READ: + w1_read_block(dev, cmd->data, cmd->len); + w1_netlink_queue_cmd(dev->priv, cmd); + break; + case W1_CMD_WRITE: + w1_write_block(dev, cmd->data, cmd->len); + break; + default: + err = -EINVAL; + break; + } - cm = (struct cn_msg *)(data); - h = (struct w1_netlink_msg *)(cm + 1); - c = (struct w1_netlink_cmd *)(h + 1); + return err; +} - memcpy(cm, msg, sizeof(struct cn_msg)); - memcpy(h, hdr, sizeof(struct w1_netlink_msg)); - memcpy(c, cmd, sizeof(struct w1_netlink_cmd)); +static int w1_process_command_addremove(struct w1_master *dev, + struct w1_netlink_cmd *cmd) +{ + struct w1_slave *sl; + int err = 0; + struct w1_reg_num *id; - cm->ack = msg->seq+1; - cm->len = sizeof(struct w1_netlink_msg) + sizeof(struct w1_netlink_cmd) + cmd->len; + if (cmd->len != sizeof(*id)) + return -EINVAL; - h->len = sizeof(struct w1_netlink_cmd) + cmd->len; + id = (struct w1_reg_num *)cmd->data; - memcpy(c->data, cmd->data, c->len); + sl = w1_slave_search_device(dev, id); + switch (cmd->cmd) { + case W1_CMD_SLAVE_ADD: + if (sl) + err = -EINVAL; + else + err = w1_attach_slave_device(dev, id); + break; + case W1_CMD_SLAVE_REMOVE: + if (sl) + w1_slave_detach(sl); + else + err = -EINVAL; + break; + default: + err = -EINVAL; + break; + } - err = cn_netlink_send(cm, 0, GFP_KERNEL); + return err; +} - kfree(data); +static int w1_process_command_master(struct w1_master *dev, + struct w1_netlink_cmd *req_cmd) +{ + int err = -EINVAL; + + /* drop bus_mutex for search (does it's own locking), and add/remove + * which doesn't use the bus + */ + switch (req_cmd->cmd) { + case W1_CMD_SEARCH: + case W1_CMD_ALARM_SEARCH: + case W1_CMD_LIST_SLAVES: + mutex_unlock(&dev->bus_mutex); + err = w1_get_slaves(dev, req_cmd); + mutex_lock(&dev->bus_mutex); + break; + case W1_CMD_READ: + case W1_CMD_WRITE: + case W1_CMD_TOUCH: + err = w1_process_command_io(dev, req_cmd); + break; + case W1_CMD_RESET: + err = w1_reset_bus(dev); + break; + case W1_CMD_SLAVE_ADD: + case W1_CMD_SLAVE_REMOVE: + mutex_unlock(&dev->bus_mutex); + mutex_lock(&dev->mutex); + err = w1_process_command_addremove(dev, req_cmd); + mutex_unlock(&dev->mutex); + mutex_lock(&dev->bus_mutex); + break; + default: + err = -EINVAL; + break; + } return err; } -static int w1_process_command_slave(struct w1_slave *sl, struct cn_msg *msg, - struct w1_netlink_msg *hdr, struct w1_netlink_cmd *cmd) +static int w1_process_command_slave(struct w1_slave *sl, + struct w1_netlink_cmd *cmd) +{ + dev_dbg(&sl->master->dev, "%s: %02x.%012llx.%02x: cmd=%02x, len=%u.\n", + __func__, sl->reg_num.family, (unsigned long long)sl->reg_num.id, + sl->reg_num.crc, cmd->cmd, cmd->len); + + return w1_process_command_io(sl->master, cmd); +} + +static int w1_process_command_root(struct cn_msg *req_cn, u32 portid) +{ + struct w1_master *dev; + struct cn_msg *cn; + struct w1_netlink_msg *msg; + u32 *id; + + cn = kmalloc(PAGE_SIZE, GFP_KERNEL); + if (!cn) + return -ENOMEM; + + cn->id.idx = CN_W1_IDX; + cn->id.val = CN_W1_VAL; + + cn->seq = req_cn->seq; + cn->ack = req_cn->seq + 1; + cn->len = sizeof(struct w1_netlink_msg); + msg = (struct w1_netlink_msg *)cn->data; + + msg->type = W1_LIST_MASTERS; + msg->status = 0; + msg->len = 0; + id = (u32 *)msg->data; + + mutex_lock(&w1_mlock); + list_for_each_entry(dev, &w1_masters, w1_master_entry) { + if (cn->len + sizeof(*id) > PAGE_SIZE - sizeof(struct cn_msg)) { + cn_netlink_send(cn, portid, 0, GFP_KERNEL); + cn->len = sizeof(struct w1_netlink_msg); + msg->len = 0; + id = (u32 *)msg->data; + } + + *id = dev->id; + msg->len += sizeof(*id); + cn->len += sizeof(*id); + id++; + } + cn_netlink_send(cn, portid, 0, GFP_KERNEL); + mutex_unlock(&w1_mlock); + + kfree(cn); + return 0; +} + +static void w1_process_cb(struct w1_master *dev, struct w1_async_cmd *async_cmd) { + struct w1_cb_node *node = container_of(async_cmd, struct w1_cb_node, + async); + u16 mlen = node->msg->len; + u16 len; int err = 0; + struct w1_slave *sl = node->sl; + struct w1_netlink_cmd *cmd = (struct w1_netlink_cmd *)node->msg->data; - dev_dbg(&sl->master->dev, "%s: %02x.%012llx.%02x: cmd=%02x, len=%u.\n", - __func__, sl->reg_num.family, (unsigned long long)sl->reg_num.id, sl->reg_num.crc, - cmd->cmd, cmd->len); + mutex_lock(&dev->bus_mutex); + dev->priv = node->block; + if (sl && w1_reset_select_slave(sl)) + err = -ENODEV; + node->block->cur_msg = node->msg; - switch (cmd->cmd) { - case W1_CMD_READ: - w1_read_block(sl->master, cmd->data, cmd->len); - w1_send_read_reply(sl, msg, hdr, cmd); + while (mlen && !err) { + if (cmd->len + sizeof(struct w1_netlink_cmd) > mlen) { + err = -E2BIG; break; - case W1_CMD_WRITE: - w1_write_block(sl->master, cmd->data, cmd->len); + } + + if (sl) + err = w1_process_command_slave(sl, cmd); + else + err = w1_process_command_master(dev, cmd); + w1_netlink_check_send(node->block); + + w1_netlink_queue_status(node->block, node->msg, cmd, err); + err = 0; + + len = sizeof(*cmd) + cmd->len; + cmd = (struct w1_netlink_cmd *)((u8 *)cmd + len); + mlen -= len; + } + + if (!cmd || err) + w1_netlink_queue_status(node->block, node->msg, cmd, err); + + /* ref taken in w1_search_slave or w1_search_master_id when building + * the block + */ + if (sl) + w1_unref_slave(sl); + else + atomic_dec(&dev->refcnt); + dev->priv = NULL; + mutex_unlock(&dev->bus_mutex); + + mutex_lock(&dev->list_mutex); + list_del(&async_cmd->async_entry); + mutex_unlock(&dev->list_mutex); + + w1_unref_block(node->block); +} + +static void w1_list_count_cmds(struct w1_netlink_msg *msg, int *cmd_count, + u16 *slave_len) +{ + struct w1_netlink_cmd *cmd = (struct w1_netlink_cmd *)msg->data; + u16 mlen = msg->len; + u16 len; + int slave_list = 0; + while (mlen) { + if (cmd->len + sizeof(struct w1_netlink_cmd) > mlen) break; + + switch (cmd->cmd) { case W1_CMD_SEARCH: case W1_CMD_ALARM_SEARCH: - w1_search_process(sl->master, - (cmd->cmd == W1_CMD_ALARM_SEARCH)?W1_ALARM_SEARCH:W1_SEARCH); - break; - default: - err = -1; - break; + case W1_CMD_LIST_SLAVES: + ++slave_list; + } + ++*cmd_count; + len = sizeof(*cmd) + cmd->len; + cmd = (struct w1_netlink_cmd *)((u8 *)cmd + len); + mlen -= len; } - return err; + if (slave_list) { + struct w1_master *dev = w1_search_master_id(msg->id.mst.id); + if (dev) { + /* Bytes, and likely an overstimate, and if it isn't + * the results can still be split between packets. + */ + *slave_len += sizeof(struct w1_reg_num) * slave_list * + (dev->slave_count + dev->max_slave_count); + /* search incremented it */ + atomic_dec(&dev->refcnt); + } + } } -static void w1_cn_callback(void *data) +static void w1_cn_callback(struct cn_msg *cn, struct netlink_skb_parms *nsp) { - struct cn_msg *msg = data; - struct w1_netlink_msg *m = (struct w1_netlink_msg *)(msg + 1); - struct w1_netlink_cmd *cmd; + struct w1_netlink_msg *msg = (struct w1_netlink_msg *)(cn + 1); struct w1_slave *sl; struct w1_master *dev; + u16 msg_len; + u16 slave_len = 0; int err = 0; + struct w1_cb_block *block = NULL; + struct w1_cb_node *node = NULL; + int node_count = 0; + int cmd_count = 0; + + /* If any unknown flag is set let the application know, that way + * applications can detect the absence of features in kernels that + * don't know about them. http://lwn.net/Articles/587527/ + */ + if (cn->flags & ~(W1_CN_BUNDLE)) { + w1_netlink_send_error(cn, msg, nsp->portid, -EINVAL); + return; + } + + /* Count the number of master or slave commands there are to allocate + * space for one cb_node each. + */ + msg_len = cn->len; + while (msg_len && !err) { + if (msg->len + sizeof(struct w1_netlink_msg) > msg_len) { + err = -E2BIG; + break; + } + + /* count messages for nodes and allocate any additional space + * required for slave lists + */ + if (msg->type == W1_MASTER_CMD || msg->type == W1_SLAVE_CMD) { + ++node_count; + w1_list_count_cmds(msg, &cmd_count, &slave_len); + } + + msg_len -= sizeof(struct w1_netlink_msg) + msg->len; + msg = (struct w1_netlink_msg *)(((u8 *)msg) + + sizeof(struct w1_netlink_msg) + msg->len); + } + msg = (struct w1_netlink_msg *)(cn + 1); + if (node_count) { + int size; + u16 reply_size = sizeof(*cn) + cn->len + slave_len; + if (cn->flags & W1_CN_BUNDLE) { + /* bundling duplicats some of the messages */ + reply_size += 2 * cmd_count * (sizeof(struct cn_msg) + + sizeof(struct w1_netlink_msg) + + sizeof(struct w1_netlink_cmd)); + } + reply_size = MIN(CONNECTOR_MAX_MSG_SIZE, reply_size); + + /* allocate space for the block, a copy of the original message, + * one node per cmd to point into the original message, + * space for replies which is the original message size plus + * space for any list slave data and status messages + * cn->len doesn't include itself which is part of the block + * */ + size = /* block + original message */ + sizeof(struct w1_cb_block) + sizeof(*cn) + cn->len + + /* space for nodes */ + node_count * sizeof(struct w1_cb_node) + + /* replies */ + sizeof(struct cn_msg) + reply_size; + block = kzalloc(size, GFP_KERNEL); + if (!block) { + /* if the system is already out of memory, + * (A) will this work, and (B) would it be better + * to not try? + */ + w1_netlink_send_error(cn, msg, nsp->portid, -ENOMEM); + return; + } + atomic_set(&block->refcnt, 1); + block->portid = nsp->portid; + memcpy(&block->request_cn, cn, sizeof(*cn) + cn->len); + node = (struct w1_cb_node *)(block->request_cn.data + cn->len); + + /* Sneeky, when not bundling, reply_size is the allocated space + * required for the reply, cn_msg isn't part of maxlen so + * it should be reply_size - sizeof(struct cn_msg), however + * when checking if there is enough space, w1_reply_make_space + * is called with the full message size including cn_msg, + * because it isn't known at that time if an additional cn_msg + * will need to be allocated. So an extra cn_msg is added + * above in "size". + */ + block->maxlen = reply_size; + block->first_cn = (struct cn_msg *)(node + node_count); + memset(block->first_cn, 0, sizeof(*block->first_cn)); + } - while (msg->len && !err) { - struct w1_reg_num id; - u16 mlen = m->len; - u8 *cmd_data = m->data; + msg_len = cn->len; + while (msg_len && !err) { dev = NULL; sl = NULL; - memcpy(&id, m->id.id, sizeof(id)); -#if 0 - printk("%s: %02x.%012llx.%02x: type=%02x, len=%u.\n", - __func__, id.family, (unsigned long long)id.id, id.crc, m->type, m->len); -#endif - if (m->len + sizeof(struct w1_netlink_msg) > msg->len) { + if (msg->len + sizeof(struct w1_netlink_msg) > msg_len) { err = -E2BIG; break; } - if (!mlen) + /* execute on this thread, no need to process later */ + if (msg->type == W1_LIST_MASTERS) { + err = w1_process_command_root(cn, nsp->portid); goto out_cont; + } - if (m->type == W1_MASTER_CMD) { - dev = w1_search_master_id(m->id.mst.id); - } else if (m->type == W1_SLAVE_CMD) { - sl = w1_search_slave(&id); + /* All following message types require additional data, + * check here before references are taken. + */ + if (!msg->len) { + err = -EPROTO; + goto out_cont; + } + + /* both search calls take references */ + if (msg->type == W1_MASTER_CMD) { + dev = w1_search_master_id(msg->id.mst.id); + } else if (msg->type == W1_SLAVE_CMD) { + sl = w1_search_slave((struct w1_reg_num *)msg->id.id); if (sl) dev = sl->master; + } else { + printk(KERN_NOTICE + "%s: cn: %x.%x, wrong type: %u, len: %u.\n", + __func__, cn->id.idx, cn->id.val, + msg->type, msg->len); + err = -EPROTO; + goto out_cont; } if (!dev) { @@ -171,37 +693,32 @@ static void w1_cn_callback(void *data) goto out_cont; } - mutex_lock(&dev->mutex); + err = 0; - if (sl && w1_reset_select_slave(sl)) { - err = -ENODEV; - goto out_up; - } + atomic_inc(&block->refcnt); + node->async.cb = w1_process_cb; + node->block = block; + node->msg = (struct w1_netlink_msg *)((u8 *)&block->request_cn + + (size_t)((u8 *)msg - (u8 *)cn)); + node->sl = sl; + node->dev = dev; - while (mlen) { - cmd = (struct w1_netlink_cmd *)cmd_data; + mutex_lock(&dev->list_mutex); + list_add_tail(&node->async.async_entry, &dev->async_list); + wake_up_process(dev->thread); + mutex_unlock(&dev->list_mutex); + ++node; - if (cmd->len + sizeof(struct w1_netlink_cmd) > mlen) { - err = -E2BIG; - break; - } - - if (sl) - w1_process_command_slave(sl, msg, m, cmd); - else - w1_process_command_master(dev, msg, m, cmd); - - cmd_data += cmd->len + sizeof(struct w1_netlink_cmd); - mlen -= cmd->len + sizeof(struct w1_netlink_cmd); - } -out_up: - atomic_dec(&dev->refcnt); - if (sl) - atomic_dec(&sl->refcnt); - mutex_unlock(&dev->mutex); out_cont: - msg->len -= sizeof(struct w1_netlink_msg) + m->len; - m = (struct w1_netlink_msg *)(((u8 *)m) + sizeof(struct w1_netlink_msg) + m->len); + /* Can't queue because that modifies block and another + * thread could be processing the messages by now and + * there isn't a lock, send directly. + */ + if (err) + w1_netlink_send_error(cn, msg, nsp->portid, err); + msg_len -= sizeof(struct w1_netlink_msg) + msg->len; + msg = (struct w1_netlink_msg *)(((u8 *)msg) + + sizeof(struct w1_netlink_msg) + msg->len); /* * Let's allow requests for nonexisting devices. @@ -209,11 +726,8 @@ out_cont: if (err == -ENODEV) err = 0; } -#if 0 - if (err) { - printk("%s: malformed message. Dropping.\n", __func__); - } -#endif + if (block) + w1_unref_block(block); } int w1_init_netlink(void) @@ -230,7 +744,7 @@ void w1_fini_netlink(void) cn_del_callback(&w1_id); } #else -void w1_netlink_send(struct w1_master *dev, struct w1_netlink_msg *msg) +void w1_netlink_send(struct w1_master *dev, struct w1_netlink_msg *cn) { } diff --git a/drivers/w1/w1_netlink.h b/drivers/w1/w1_netlink.h index 56122b9e929..c99a9ce05e6 100644 --- a/drivers/w1/w1_netlink.h +++ b/drivers/w1/w1_netlink.h @@ -1,7 +1,7 @@ /* * w1_netlink.h * - * Copyright (c) 2003 Evgeniy Polyakov <johnpol@2ka.mipt.ru> + * Copyright (c) 2003 Evgeniy Polyakov <zbr@ioremap.net> * * * This program is free software; you can redistribute it and/or modify @@ -27,6 +27,29 @@ #include "w1.h" +/** + * enum w1_cn_msg_flags - bitfield flags for struct cn_msg.flags + * + * @W1_CN_BUNDLE: Request bundling replies into fewer messagse. Be prepared + * to handle multiple struct cn_msg, struct w1_netlink_msg, and + * struct w1_netlink_cmd in one packet. + */ +enum w1_cn_msg_flags { + W1_CN_BUNDLE = 1, +}; + +/** + * enum w1_netlink_message_types - message type + * + * @W1_SLAVE_ADD: notification that a slave device was added + * @W1_SLAVE_REMOVE: notification that a slave device was removed + * @W1_MASTER_ADD: notification that a new bus master was added + * @W1_MASTER_REMOVE: notification that a bus masterwas removed + * @W1_MASTER_CMD: initiate operations on a specific master + * @W1_SLAVE_CMD: sends reset, selects the slave, then does a read/write/touch + * operation + * @W1_LIST_MASTERS: used to determine the bus master identifiers + */ enum w1_netlink_message_types { W1_SLAVE_ADD = 0, W1_SLAVE_REMOVE, @@ -34,12 +57,26 @@ enum w1_netlink_message_types { W1_MASTER_REMOVE, W1_MASTER_CMD, W1_SLAVE_CMD, + W1_LIST_MASTERS, }; +/** + * struct w1_netlink_msg - holds w1 message type, id, and result + * + * @type: one of enum w1_netlink_message_types + * @status: kernel feedback for success 0 or errno failure value + * @len: length of data following w1_netlink_msg + * @id: union holding master bus id (msg.id) and slave device id (id[8]). + * @data: start address of any following data + * + * The base message structure for w1 messages over netlink. + * The netlink connector data sequence is, struct nlmsghdr, struct cn_msg, + * then one or more struct w1_netlink_msg (each with optional data). + */ struct w1_netlink_msg { __u8 type; - __u8 reserved; + __u8 status; __u16 len; union { __u8 id[8]; @@ -51,11 +88,47 @@ struct w1_netlink_msg __u8 data[0]; }; -#define W1_CMD_READ 0x0 -#define W1_CMD_WRITE 0x1 -#define W1_CMD_SEARCH 0x2 -#define W1_CMD_ALARM_SEARCH 0x3 +/** + * enum w1_commands - commands available for master or slave operations + * + * @W1_CMD_READ: read len bytes + * @W1_CMD_WRITE: write len bytes + * @W1_CMD_SEARCH: initiate a standard search, returns only the slave + * devices found during that search + * @W1_CMD_ALARM_SEARCH: search for devices that are currently alarming + * @W1_CMD_TOUCH: Touches a series of bytes. + * @W1_CMD_RESET: sends a bus reset on the given master + * @W1_CMD_SLAVE_ADD: adds a slave to the given master, + * 8 byte slave id at data[0] + * @W1_CMD_SLAVE_REMOVE: removes a slave to the given master, + * 8 byte slave id at data[0] + * @W1_CMD_LIST_SLAVES: list of slaves registered on this master + * @W1_CMD_MAX: number of available commands + */ +enum w1_commands { + W1_CMD_READ = 0, + W1_CMD_WRITE, + W1_CMD_SEARCH, + W1_CMD_ALARM_SEARCH, + W1_CMD_TOUCH, + W1_CMD_RESET, + W1_CMD_SLAVE_ADD, + W1_CMD_SLAVE_REMOVE, + W1_CMD_LIST_SLAVES, + W1_CMD_MAX +}; +/** + * struct w1_netlink_cmd - holds the command and data + * + * @cmd: one of enum w1_commands + * @res: reserved + * @len: length of data following w1_netlink_cmd + * @data: start address of any following data + * + * One or more struct w1_netlink_cmd is placed starting at w1_netlink_msg.data + * each with optional data. + */ struct w1_netlink_cmd { __u8 cmd; |