diff options
Diffstat (limited to 'drivers/gpio')
| -rw-r--r-- | drivers/gpio/Kconfig | 57 | ||||
| -rw-r--r-- | drivers/gpio/Makefile | 6 | ||||
| -rw-r--r-- | drivers/gpio/cs5535-gpio.c | 4 | ||||
| -rw-r--r-- | drivers/gpio/gpiolib.c | 66 | ||||
| -rw-r--r-- | drivers/gpio/it8761e_gpio.c | 231 | ||||
| -rw-r--r-- | drivers/gpio/max7300.c | 94 | ||||
| -rw-r--r-- | drivers/gpio/max7301.c | 293 | ||||
| -rw-r--r-- | drivers/gpio/max730x.c | 244 | ||||
| -rw-r--r-- | drivers/gpio/pca953x.c | 249 | ||||
| -rw-r--r-- | drivers/gpio/pl061.c | 2 | ||||
| -rw-r--r-- | drivers/gpio/sch_gpio.c | 295 | ||||
| -rw-r--r-- | drivers/gpio/timbgpio.c | 35 | ||||
| -rw-r--r-- | drivers/gpio/wm831x-gpio.c | 45 | ||||
| -rw-r--r-- | drivers/gpio/wm8350-gpiolib.c | 181 | ||||
| -rw-r--r-- | drivers/gpio/wm8994-gpio.c | 204 |
15 files changed, 1708 insertions, 298 deletions
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index 1f1d88ae68d..fee678f74a1 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -65,8 +65,17 @@ config GPIO_SYSFS # put expanders in the right section, in alphabetical order +config GPIO_MAX730X + tristate + comment "Memory mapped GPIO expanders:" +config GPIO_IT8761E + tristate "IT8761E GPIO support" + depends on GPIOLIB + help + Say yes here to support GPIO functionality of IT8761E super I/O chip. + config GPIO_PL061 bool "PrimeCell PL061 GPIO support" depends on ARM_AMBA @@ -85,8 +94,32 @@ config GPIO_VR41XX help Say yes here to support the NEC VR4100 series General-purpose I/O Uint +config GPIO_SCH + tristate "Intel SCH GPIO" + depends on GPIOLIB && PCI + select MFD_CORE + select LPC_SCH + help + Say yes here to support GPIO interface on Intel Poulsbo SCH. + The Intel SCH contains a total of 14 GPIO pins. Ten GPIOs are + powered by the core power rail and are turned off during sleep + modes (S3 and higher). The remaining four GPIOs are powered by + the Intel SCH suspend power supply. These GPIOs remain + active during S3. The suspend powered GPIOs can be used to wake the + system from the Suspend-to-RAM state. + + This driver can also be built as a module. If so, the module + will be called sch-gpio. + comment "I2C GPIO expanders:" +config GPIO_MAX7300 + tristate "Maxim MAX7300 GPIO expander" + depends on I2C + select GPIO_MAX730X + help + GPIO driver for Maxim MAX7301 I2C-based GPIO expander. + config GPIO_MAX732X tristate "MAX7319, MAX7320-7327 I2C Port Expanders" depends on I2C @@ -124,6 +157,13 @@ config GPIO_PCA953X This driver can also be built as a module. If so, the module will be called pca953x. +config GPIO_PCA953X_IRQ + bool "Interrupt controller support for PCA953x" + depends on GPIO_PCA953X=y + help + Say yes here to enable the pca953x to be used as an interrupt + controller. It requires the driver to be built in the kernel. + config GPIO_PCF857X tristate "PCF857x, PCA{85,96}7x, and MAX732[89] I2C GPIO expanders" depends on I2C @@ -162,6 +202,20 @@ config GPIO_WM831X Say yes here to access the GPIO signals of WM831x power management chips from Wolfson Microelectronics. +config GPIO_WM8350 + tristate "WM8350 GPIOs" + depends on MFD_WM8350 + help + Say yes here to access the GPIO signals of WM8350 power management + chips from Wolfson Microelectronics. + +config GPIO_WM8994 + tristate "WM8994 GPIOs" + depends on MFD_WM8994 + help + Say yes here to access the GPIO signals of WM8994 audio hub + CODECs from Wolfson Microelectronics. + config GPIO_ADP5520 tristate "GPIO Support for ADP5520 PMIC" depends on PMIC_ADP5520 @@ -226,8 +280,9 @@ comment "SPI GPIO expanders:" config GPIO_MAX7301 tristate "Maxim MAX7301 GPIO expander" depends on SPI_MASTER + select GPIO_MAX730X help - gpio driver for Maxim MAX7301 SPI GPIO expander. + GPIO driver for Maxim MAX7301 SPI-based GPIO expander. config GPIO_MCP23S08 tristate "Microchip MCP23S08 I/O expander" diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile index 48687238edb..10f3f8d958b 100644 --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -7,6 +7,8 @@ obj-$(CONFIG_GPIOLIB) += gpiolib.o obj-$(CONFIG_GPIO_ADP5520) += adp5520-gpio.o obj-$(CONFIG_GPIO_ADP5588) += adp5588-gpio.o obj-$(CONFIG_GPIO_LANGWELL) += langwell_gpio.o +obj-$(CONFIG_GPIO_MAX730X) += max730x.o +obj-$(CONFIG_GPIO_MAX7300) += max7300.o obj-$(CONFIG_GPIO_MAX7301) += max7301.o obj-$(CONFIG_GPIO_MAX732X) += max732x.o obj-$(CONFIG_GPIO_MC33880) += mc33880.o @@ -20,5 +22,9 @@ obj-$(CONFIG_GPIO_UCB1400) += ucb1400_gpio.o obj-$(CONFIG_GPIO_XILINX) += xilinx_gpio.o obj-$(CONFIG_GPIO_CS5535) += cs5535-gpio.o obj-$(CONFIG_GPIO_BT8XX) += bt8xxgpio.o +obj-$(CONFIG_GPIO_IT8761E) += it8761e_gpio.o obj-$(CONFIG_GPIO_VR41XX) += vr41xx_giu.o obj-$(CONFIG_GPIO_WM831X) += wm831x-gpio.o +obj-$(CONFIG_GPIO_WM8350) += wm8350-gpiolib.o +obj-$(CONFIG_GPIO_WM8994) += wm8994-gpio.o +obj-$(CONFIG_GPIO_SCH) += sch_gpio.o
\ No newline at end of file diff --git a/drivers/gpio/cs5535-gpio.c b/drivers/gpio/cs5535-gpio.c index 0fdbe94f24a..0c3c498f226 100644 --- a/drivers/gpio/cs5535-gpio.c +++ b/drivers/gpio/cs5535-gpio.c @@ -154,7 +154,7 @@ static int chip_gpio_request(struct gpio_chip *c, unsigned offset) static int chip_gpio_get(struct gpio_chip *chip, unsigned offset) { - return cs5535_gpio_isset(offset, GPIO_OUTPUT_VAL); + return cs5535_gpio_isset(offset, GPIO_READ_BACK); } static void chip_gpio_set(struct gpio_chip *chip, unsigned offset, int val) @@ -172,6 +172,7 @@ static int chip_direction_input(struct gpio_chip *c, unsigned offset) spin_lock_irqsave(&chip->lock, flags); __cs5535_gpio_set(chip, offset, GPIO_INPUT_ENABLE); + __cs5535_gpio_clear(chip, offset, GPIO_OUTPUT_ENABLE); spin_unlock_irqrestore(&chip->lock, flags); return 0; @@ -184,6 +185,7 @@ static int chip_direction_output(struct gpio_chip *c, unsigned offset, int val) spin_lock_irqsave(&chip->lock, flags); + __cs5535_gpio_set(chip, offset, GPIO_INPUT_ENABLE); __cs5535_gpio_set(chip, offset, GPIO_OUTPUT_ENABLE); if (val) __cs5535_gpio_set(chip, offset, GPIO_OUTPUT_VAL); diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index 350842ad363..6d1b86661e6 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -623,7 +623,9 @@ static const struct attribute_group gpiochip_attr_group = { * /sys/class/gpio/unexport ... write-only * integer N ... number of GPIO to unexport */ -static ssize_t export_store(struct class *class, const char *buf, size_t len) +static ssize_t export_store(struct class *class, + struct class_attribute *attr, + const char *buf, size_t len) { long gpio; int status; @@ -653,7 +655,9 @@ done: return status ? : len; } -static ssize_t unexport_store(struct class *class, const char *buf, size_t len) +static ssize_t unexport_store(struct class *class, + struct class_attribute *attr, + const char *buf, size_t len) { long gpio; int status; @@ -1237,6 +1241,64 @@ void gpio_free(unsigned gpio) } EXPORT_SYMBOL_GPL(gpio_free); +/** + * gpio_request_one - request a single GPIO with initial configuration + * @gpio: the GPIO number + * @flags: GPIO configuration as specified by GPIOF_* + * @label: a literal description string of this GPIO + */ +int gpio_request_one(unsigned gpio, unsigned long flags, const char *label) +{ + int err; + + err = gpio_request(gpio, label); + if (err) + return err; + + if (flags & GPIOF_DIR_IN) + err = gpio_direction_input(gpio); + else + err = gpio_direction_output(gpio, + (flags & GPIOF_INIT_HIGH) ? 1 : 0); + + return err; +} +EXPORT_SYMBOL_GPL(gpio_request_one); + +/** + * gpio_request_array - request multiple GPIOs in a single call + * @array: array of the 'struct gpio' + * @num: how many GPIOs in the array + */ +int gpio_request_array(struct gpio *array, size_t num) +{ + int i, err; + + for (i = 0; i < num; i++, array++) { + err = gpio_request_one(array->gpio, array->flags, array->label); + if (err) + goto err_free; + } + return 0; + +err_free: + while (i--) + gpio_free((--array)->gpio); + return err; +} +EXPORT_SYMBOL_GPL(gpio_request_array); + +/** + * gpio_free_array - release multiple GPIOs in a single call + * @array: array of the 'struct gpio' + * @num: how many GPIOs in the array + */ +void gpio_free_array(struct gpio *array, size_t num) +{ + while (num--) + gpio_free((array++)->gpio); +} +EXPORT_SYMBOL_GPL(gpio_free_array); /** * gpiochip_is_requested - return string iff signal was requested diff --git a/drivers/gpio/it8761e_gpio.c b/drivers/gpio/it8761e_gpio.c new file mode 100644 index 00000000000..753219cf993 --- /dev/null +++ b/drivers/gpio/it8761e_gpio.c @@ -0,0 +1,231 @@ +/* + * it8761_gpio.c - GPIO interface for IT8761E Super I/O chip + * + * Author: Denis Turischev <denis@compulab.co.il> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License 2 as published + * by the Free Software Foundation. + * + * 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; see the file COPYING. If not, write to + * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/io.h> +#include <linux/errno.h> +#include <linux/ioport.h> + +#include <linux/gpio.h> + +#define SIO_CHIP_ID 0x8761 +#define CHIP_ID_HIGH_BYTE 0x20 +#define CHIP_ID_LOW_BYTE 0x21 + +static u8 ports[2] = { 0x2e, 0x4e }; +static u8 port; + +static DEFINE_SPINLOCK(sio_lock); + +#define GPIO_NAME "it8761-gpio" +#define GPIO_BA_HIGH_BYTE 0x60 +#define GPIO_BA_LOW_BYTE 0x61 +#define GPIO_IOSIZE 4 +#define GPIO1X_IO 0xf0 +#define GPIO2X_IO 0xf1 + +static u16 gpio_ba; + +static u8 read_reg(u8 addr, u8 port) +{ + outb(addr, port); + return inb(port + 1); +} + +static void write_reg(u8 data, u8 addr, u8 port) +{ + outb(addr, port); + outb(data, port + 1); +} + +static void enter_conf_mode(u8 port) +{ + outb(0x87, port); + outb(0x61, port); + outb(0x55, port); + outb((port == 0x2e) ? 0x55 : 0xaa, port); +} + +static void exit_conf_mode(u8 port) +{ + outb(0x2, port); + outb(0x2, port + 1); +} + +static void enter_gpio_mode(u8 port) +{ + write_reg(0x2, 0x7, port); +} + +static int it8761e_gpio_get(struct gpio_chip *gc, unsigned gpio_num) +{ + u16 reg; + u8 bit; + + bit = gpio_num % 7; + reg = (gpio_num >= 7) ? gpio_ba + 1 : gpio_ba; + + return !!(inb(reg) & (1 << bit)); +} + +static int it8761e_gpio_direction_in(struct gpio_chip *gc, unsigned gpio_num) +{ + u8 curr_dirs; + u8 io_reg, bit; + + bit = gpio_num % 7; + io_reg = (gpio_num >= 7) ? GPIO2X_IO : GPIO1X_IO; + + spin_lock(&sio_lock); + + enter_conf_mode(port); + enter_gpio_mode(port); + + curr_dirs = read_reg(io_reg, port); + + if (curr_dirs & (1 << bit)) + write_reg(curr_dirs & ~(1 << bit), io_reg, port); + + exit_conf_mode(port); + + spin_unlock(&sio_lock); + return 0; +} + +static void it8761e_gpio_set(struct gpio_chip *gc, + unsigned gpio_num, int val) +{ + u8 curr_vals, bit; + u16 reg; + + bit = gpio_num % 7; + reg = (gpio_num >= 7) ? gpio_ba + 1 : gpio_ba; + + spin_lock(&sio_lock); + + curr_vals = inb(reg); + if (val) + outb(curr_vals | (1 << bit) , reg); + else + outb(curr_vals & ~(1 << bit), reg); + + spin_unlock(&sio_lock); +} + +static int it8761e_gpio_direction_out(struct gpio_chip *gc, + unsigned gpio_num, int val) +{ + u8 curr_dirs, io_reg, bit; + + bit = gpio_num % 7; + io_reg = (gpio_num >= 7) ? GPIO2X_IO : GPIO1X_IO; + + it8761e_gpio_set(gc, gpio_num, val); + + spin_lock(&sio_lock); + + enter_conf_mode(port); + enter_gpio_mode(port); + + curr_dirs = read_reg(io_reg, port); + + if (!(curr_dirs & (1 << bit))) + write_reg(curr_dirs | (1 << bit), io_reg, port); + + exit_conf_mode(port); + + spin_unlock(&sio_lock); + return 0; +} + +static struct gpio_chip it8761e_gpio_chip = { + .label = GPIO_NAME, + .owner = THIS_MODULE, + .get = it8761e_gpio_get, + .direction_input = it8761e_gpio_direction_in, + .set = it8761e_gpio_set, + .direction_output = it8761e_gpio_direction_out, +}; + +static int __init it8761e_gpio_init(void) +{ + int i, id, err; + + /* chip and port detection */ + for (i = 0; i < ARRAY_SIZE(ports); i++) { + spin_lock(&sio_lock); + enter_conf_mode(ports[i]); + + id = (read_reg(CHIP_ID_HIGH_BYTE, ports[i]) << 8) + + read_reg(CHIP_ID_LOW_BYTE, ports[i]); + + exit_conf_mode(ports[i]); + spin_unlock(&sio_lock); + + if (id == SIO_CHIP_ID) { + port = ports[i]; + break; + } + } + + if (!port) + return -ENODEV; + + /* fetch GPIO base address */ + enter_conf_mode(port); + enter_gpio_mode(port); + gpio_ba = (read_reg(GPIO_BA_HIGH_BYTE, port) << 8) + + read_reg(GPIO_BA_LOW_BYTE, port); + exit_conf_mode(port); + + if (!request_region(gpio_ba, GPIO_IOSIZE, GPIO_NAME)) + return -EBUSY; + + it8761e_gpio_chip.base = -1; + it8761e_gpio_chip.ngpio = 14; + + err = gpiochip_add(&it8761e_gpio_chip); + if (err < 0) + goto gpiochip_add_err; + + return 0; + +gpiochip_add_err: + release_region(gpio_ba, GPIO_IOSIZE); + gpio_ba = 0; + return err; +} + +static void __exit it8761e_gpio_exit(void) +{ + if (gpio_ba) { + gpiochip_remove(&it8761e_gpio_chip); + + release_region(gpio_ba, GPIO_IOSIZE); + gpio_ba = 0; + } +} +module_init(it8761e_gpio_init); +module_exit(it8761e_gpio_exit); + +MODULE_AUTHOR("Denis Turischev <denis@compulab.co.il>"); +MODULE_DESCRIPTION("GPIO interface for IT8761E Super I/O chip"); +MODULE_LICENSE("GPL"); diff --git a/drivers/gpio/max7300.c b/drivers/gpio/max7300.c new file mode 100644 index 00000000000..9d74eef1157 --- /dev/null +++ b/drivers/gpio/max7300.c @@ -0,0 +1,94 @@ +/* + * drivers/gpio/max7300.c + * + * Copyright (C) 2009 Wolfram Sang, Pengutronix + * + * 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. + * + * Check max730x.c for further details. + */ + +#include <linux/module.h> +#include <linux/init.h> +#include <linux/platform_device.h> +#include <linux/mutex.h> +#include <linux/i2c.h> +#include <linux/spi/max7301.h> + +static int max7300_i2c_write(struct device *dev, unsigned int reg, + unsigned int val) +{ + struct i2c_client *client = to_i2c_client(dev); + + return i2c_smbus_write_byte_data(client, reg, val); +} + +static int max7300_i2c_read(struct device *dev, unsigned int reg) +{ + struct i2c_client *client = to_i2c_client(dev); + + return i2c_smbus_read_byte_data(client, reg); +} + +static int __devinit max7300_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct max7301 *ts; + int ret; + + if (!i2c_check_functionality(client->adapter, + I2C_FUNC_SMBUS_BYTE_DATA)) + return -EIO; + + ts = kzalloc(sizeof(struct max7301), GFP_KERNEL); + if (!ts) + return -ENOMEM; + + ts->read = max7300_i2c_read; + ts->write = max7300_i2c_write; + ts->dev = &client->dev; + + ret = __max730x_probe(ts); + if (ret) + kfree(ts); + return ret; +} + +static int __devexit max7300_remove(struct i2c_client *client) +{ + return __max730x_remove(&client->dev); +} + +static const struct i2c_device_id max7300_id[] = { + { "max7300", 0 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, max7300_id); + +static struct i2c_driver max7300_driver = { + .driver = { + .name = "max7300", + .owner = THIS_MODULE, + }, + .probe = max7300_probe, + .remove = __devexit_p(max7300_remove), + .id_table = max7300_id, +}; + +static int __init max7300_init(void) +{ + return i2c_add_driver(&max7300_driver); +} +subsys_initcall(max7300_init); + +static void __exit max7300_exit(void) +{ + i2c_del_driver(&max7300_driver); +} +module_exit(max7300_exit); + +MODULE_AUTHOR("Wolfram Sang"); +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("MAX7300 GPIO-Expander"); diff --git a/drivers/gpio/max7301.c b/drivers/gpio/max7301.c index 480956f1ca5..965d9b1ea13 100644 --- a/drivers/gpio/max7301.c +++ b/drivers/gpio/max7301.c @@ -1,98 +1,41 @@ -/** +/* * drivers/gpio/max7301.c * * Copyright (C) 2006 Juergen Beisert, Pengutronix * Copyright (C) 2008 Guennadi Liakhovetski, Pengutronix + * Copyright (C) 2009 Wolfram Sang, Pengutronix * * 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. * - * The Maxim's MAX7301 device is an SPI driven GPIO expander. There are - * 28 GPIOs. 8 of them can trigger an interrupt. See datasheet for more - * details - * Note: - * - DIN must be stable at the rising edge of clock. - * - when writing: - * - always clock in 16 clocks at once - * - at DIN: D15 first, D0 last - * - D0..D7 = databyte, D8..D14 = commandbyte - * - D15 = low -> write command - * - when reading - * - always clock in 16 clocks at once - * - at DIN: D15 first, D0 last - * - D0..D7 = dummy, D8..D14 = register address - * - D15 = high -> read command - * - raise CS and assert it again - * - always clock in 16 clocks at once - * - at DOUT: D15 first, D0 last - * - D0..D7 contains the data from the first cycle - * - * The driver exports a standard gpiochip interface + * Check max730x.c for further details. */ +#include <linux/module.h> #include <linux/init.h> #include <linux/platform_device.h> #include <linux/mutex.h> #include <linux/spi/spi.h> #include <linux/spi/max7301.h> -#include <linux/gpio.h> - -#define DRIVER_NAME "max7301" - -/* - * Pin configurations, see MAX7301 datasheet page 6 - */ -#define PIN_CONFIG_MASK 0x03 -#define PIN_CONFIG_IN_PULLUP 0x03 -#define PIN_CONFIG_IN_WO_PULLUP 0x02 -#define PIN_CONFIG_OUT 0x01 - -#define PIN_NUMBER 28 - - -/* - * Some registers must be read back to modify. - * To save time we cache them here in memory - */ -struct max7301 { - struct mutex lock; - u8 port_config[8]; /* field 0 is unused */ - u32 out_level; /* cached output levels */ - struct gpio_chip chip; - struct spi_device *spi; -}; -/** - * max7301_write - Write a new register content - * @spi: The SPI device - * @reg: Register offset - * @val: Value to write - * - * A write to the MAX7301 means one message with one transfer - * - * Returns 0 if successful or a negative value on error - */ -static int max7301_write(struct spi_device *spi, unsigned int reg, unsigned int val) +/* A write to the MAX7301 means one message with one transfer */ +static int max7301_spi_write(struct device *dev, unsigned int reg, + unsigned int val) { + struct spi_device *spi = to_spi_device(dev); u16 word = ((reg & 0x7F) << 8) | (val & 0xFF); + return spi_write(spi, (const u8 *)&word, sizeof(word)); } -/** - * max7301_read - Read back register content - * @spi: The SPI device - * @reg: Register offset - * - * A read from the MAX7301 means two transfers; here, one message each - * - * Returns positive 8 bit value from device if successful or a - * negative value on error - */ -static int max7301_read(struct spi_device *spi, unsigned int reg) +/* A read from the MAX7301 means two transfers; here, one message each */ + +static int max7301_spi_read(struct device *dev, unsigned int reg) { int ret; u16 word; + struct spi_device *spi = to_spi_device(dev); word = 0x8000 | (reg << 8); ret = spi_write(spi, (const u8 *)&word, sizeof(word)); @@ -108,125 +51,13 @@ static int max7301_read(struct spi_device *spi, unsigned int reg) return word & 0xff; } -static int max7301_direction_input(struct gpio_chip *chip, unsigned offset) -{ - struct max7301 *ts = container_of(chip, struct max7301, chip); - u8 *config; - int ret; - - /* First 4 pins are unused in the controller */ - offset += 4; - - config = &ts->port_config[offset >> 2]; - - mutex_lock(&ts->lock); - - /* Standard GPIO API doesn't support pull-ups, has to be extended. - * Hard-coding no pollup for now. */ - *config = (*config & ~(3 << (offset & 3))) | (1 << (offset & 3)); - - ret = max7301_write(ts->spi, 0x08 + (offset >> 2), *config); - - mutex_unlock(&ts->lock); - - return ret; -} - -static int __max7301_set(struct max7301 *ts, unsigned offset, int value) -{ - if (value) { - ts->out_level |= 1 << offset; - return max7301_write(ts->spi, 0x20 + offset, 0x01); - } else { - ts->out_level &= ~(1 << offset); - return max7301_write(ts->spi, 0x20 + offset, 0x00); - } -} - -static int max7301_direction_output(struct gpio_chip *chip, unsigned offset, - int value) -{ - struct max7301 *ts = container_of(chip, struct max7301, chip); - u8 *config; - int ret; - - /* First 4 pins are unused in the controller */ - offset += 4; - - config = &ts->port_config[offset >> 2]; - - mutex_lock(&ts->lock); - - *config = (*config & ~(3 << (offset & 3))) | (1 << (offset & 3)); - - ret = __max7301_set(ts, offset, value); - - if (!ret) - ret = max7301_write(ts->spi, 0x08 + (offset >> 2), *config); - - mutex_unlock(&ts->lock); - - return ret; -} - -static int max7301_get(struct gpio_chip *chip, unsigned offset) -{ - struct max7301 *ts = container_of(chip, struct max7301, chip); - int config, level = -EINVAL; - - /* First 4 pins are unused in the controller */ - offset += 4; - - mutex_lock(&ts->lock); - - config = (ts->port_config[offset >> 2] >> ((offset & 3) * 2)) & 3; - - switch (config) { - case 1: - /* Output: return cached level */ - level = !!(ts->out_level & (1 << offset)); - break; - case 2: - case 3: - /* Input: read out */ - level = max7301_read(ts->spi, 0x20 + offset) & 0x01; - } - mutex_unlock(&ts->lock); - - return level; -} - -static void max7301_set(struct gpio_chip *chip, unsigned offset, int value) -{ - struct max7301 *ts = container_of(chip, struct max7301, chip); - - /* First 4 pins are unused in the controller */ - offset += 4; - - mutex_lock(&ts->lock); - - __max7301_set(ts, offset, value); - - mutex_unlock(&ts->lock); -} - static int __devinit max7301_probe(struct spi_device *spi) { struct max7301 *ts; - struct max7301_platform_data *pdata; - int i, ret; - - pdata = spi->dev.platform_data; - if (!pdata || !pdata->base) { - dev_dbg(&spi->dev, "incorrect or missing platform data\n"); - return -EINVAL; - } + int ret; - /* - * bits_per_word cannot be configured in platform data - */ + /* bits_per_word cannot be configured in platform data */ spi->bits_per_word = 16; - ret = spi_setup(spi); if (ret < 0) return ret; @@ -235,90 +66,35 @@ static int __devinit max7301_probe(struct spi_device *spi) if (!ts) return -ENOMEM; - mutex_init(&ts->lock); - - dev_set_drvdata(&spi->dev, ts); + ts->read = max7301_spi_read; + ts->write = max7301_spi_write; + ts->dev = &spi->dev; - /* Power up the chip and disable IRQ output */ - max7301_write(spi, 0x04, 0x01); - - ts->spi = spi; - - ts->chip.label = DRIVER_NAME, - - ts->chip.direction_input = max7301_direction_input; - ts->chip.get = max7301_get; - ts->chip.direction_output = max7301_direction_output; - ts->chip.set = max7301_set; - - ts->chip.base = pdata->base; - ts->chip.ngpio = PIN_NUMBER; - ts->chip.can_sleep = 1; - ts->chip.dev = &spi->dev; - ts->chip.owner = THIS_MODULE; - - /* - * tristate all pins in hardware and cache the - * register values for later use. - */ - for (i = 1; i < 8; i++) { - int j; - /* 0xAA means input with internal pullup disabled */ - max7301_write(spi, 0x08 + i, 0xAA); - ts->port_config[i] = 0xAA; - for (j = 0; j < 4; j++) { - int offset = (i - 1) * 4 + j; - ret = max7301_direction_input(&ts->chip, offset); - if (ret) - goto exit_destroy; - } - } - - ret = gpiochip_add(&ts->chip); + ret = __max730x_probe(ts); if (ret) - goto exit_destroy; - - return ret; - -exit_destroy: - dev_set_drvdata(&spi->dev, NULL); - mutex_destroy(&ts->lock); - kfree(ts); + kfree(ts); return ret; } static int __devexit max7301_remove(struct spi_device *spi) { - struct max7301 *ts; - int ret; - - ts = dev_get_drvdata(&spi->dev); - if (ts == NULL) - return -ENODEV; - - dev_set_drvdata(&spi->dev, NULL); - - /* Power down the chip and disable IRQ output */ - max7301_write(spi, 0x04, 0x00); - - ret = gpiochip_remove(&ts->chip); - if (!ret) { - mutex_destroy(&ts->lock); - kfree(ts); - } else - dev_err(&spi->dev, "Failed to remove the GPIO controller: %d\n", - ret); - - return ret; + return __max730x_remove(&spi->dev); } +static const struct spi_device_id max7301_id[] = { + { "max7301", 0 }, + { } +}; +MODULE_DEVICE_TABLE(spi, max7301_id); + static struct spi_driver max7301_driver = { .driver = { - .name = DRIVER_NAME, - .owner = THIS_MODULE, + .name = "max7301", + .owner = THIS_MODULE, }, - .probe = max7301_probe, - .remove = __devexit_p(max7301_remove), + .probe = max7301_probe, + .remove = __devexit_p(max7301_remove), + .id_table = max7301_id, }; static int __init max7301_init(void) @@ -336,7 +112,6 @@ static void __exit max7301_exit(void) } module_exit(max7301_exit); -MODULE_AUTHOR("Juergen Beisert"); +MODULE_AUTHOR("Juergen Beisert, Wolfram Sang"); MODULE_LICENSE("GPL v2"); -MODULE_DESCRIPTION("MAX7301 SPI based GPIO-Expander"); -MODULE_ALIAS("spi:" DRIVER_NAME); +MODULE_DESCRIPTION("MAX7301 GPIO-Expander"); diff --git a/drivers/gpio/max730x.c b/drivers/gpio/max730x.c new file mode 100644 index 00000000000..c9bced55f82 --- /dev/null +++ b/drivers/gpio/max730x.c @@ -0,0 +1,244 @@ +/** + * drivers/gpio/max7301.c + * + * Copyright (C) 2006 Juergen Beisert, Pengutronix + * Copyright (C) 2008 Guennadi Liakhovetski, Pengutronix + * Copyright (C) 2009 Wolfram Sang, Pengutronix + * + * 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. + * + * The Maxim MAX7300/1 device is an I2C/SPI driven GPIO expander. There are + * 28 GPIOs. 8 of them can trigger an interrupt. See datasheet for more + * details + * Note: + * - DIN must be stable at the rising edge of clock. + * - when writing: + * - always clock in 16 clocks at once + * - at DIN: D15 first, D0 last + * - D0..D7 = databyte, D8..D14 = commandbyte + * - D15 = low -> write command + * - when reading + * - always clock in 16 clocks at once + * - at DIN: D15 first, D0 last + * - D0..D7 = dummy, D8..D14 = register address + * - D15 = high -> read command + * - raise CS and assert it again + * - always clock in 16 clocks at once + * - at DOUT: D15 first, D0 last + * - D0..D7 contains the data from the first cycle + * + * The driver exports a standard gpiochip interface + */ + +#include <linux/module.h> +#include <linux/init.h> +#include <linux/platform_device.h> +#include <linux/mutex.h> +#include <linux/spi/max7301.h> +#include <linux/gpio.h> + +/* + * Pin configurations, see MAX7301 datasheet page 6 + */ +#define PIN_CONFIG_MASK 0x03 +#define PIN_CONFIG_IN_PULLUP 0x03 +#define PIN_CONFIG_IN_WO_PULLUP 0x02 +#define PIN_CONFIG_OUT 0x01 + +#define PIN_NUMBER 28 + +static int max7301_direction_input(struct gpio_chip *chip, unsigned offset) +{ + struct max7301 *ts = container_of(chip, struct max7301, chip); + u8 *config; + u8 offset_bits; + int ret; + + /* First 4 pins are unused in the controller */ + offset += 4; + offset_bits = (offset & 3) << 1; + + config = &ts->port_config[offset >> 2]; + + mutex_lock(&ts->lock); + + /* Standard GPIO API doesn't support pull-ups, has to be extended. + * Hard-coding no pollup for now. */ + *config = (*config & ~(PIN_CONFIG_MASK << offset_bits)) + | (PIN_CONFIG_IN_WO_PULLUP << offset_bits); + + ret = ts->write(ts->dev, 0x08 + (offset >> 2), *config); + + mutex_unlock(&ts->lock); + + return ret; +} + +static int __max7301_set(struct max7301 *ts, unsigned offset, int value) +{ + if (value) { + ts->out_level |= 1 << offset; + return ts->write(ts->dev, 0x20 + offset, 0x01); + } else { + ts->out_level &= ~(1 << offset); + return ts->write(ts->dev, 0x20 + offset, 0x00); + } +} + +static int max7301_direction_output(struct gpio_chip *chip, unsigned offset, + int value) +{ + struct max7301 *ts = container_of(chip, struct max7301, chip); + u8 *config; + u8 offset_bits; + int ret; + + /* First 4 pins are unused in the controller */ + offset += 4; + offset_bits = (offset & 3) << 1; + + config = &ts->port_config[offset >> 2]; + + mutex_lock(&ts->lock); + + *config = (*config & ~(PIN_CONFIG_MASK << offset_bits)) + | (PIN_CONFIG_OUT << offset_bits); + + ret = __max7301_set(ts, offset, value); + + if (!ret) + ret = ts->write(ts->dev, 0x08 + (offset >> 2), *config); + + mutex_unlock(&ts->lock); + + return ret; +} + +static int max7301_get(struct gpio_chip *chip, unsigned offset) +{ + struct max7301 *ts = container_of(chip, struct max7301, chip); + int config, level = -EINVAL; + + /* First 4 pins are unused in the controller */ + offset += 4; + + mutex_lock(&ts->lock); + + config = (ts->port_config[offset >> 2] >> ((offset & 3) << 1)) + & PIN_CONFIG_MASK; + + switch (config) { + case PIN_CONFIG_OUT: + /* Output: return cached level */ + level = !!(ts->out_level & (1 << offset)); + break; + case PIN_CONFIG_IN_WO_PULLUP: + case PIN_CONFIG_IN_PULLUP: + /* Input: read out */ + level = ts->read(ts->dev, 0x20 + offset) & 0x01; + } + mutex_unlock(&ts->lock); + + return level; +} + |