diff options
Diffstat (limited to 'drivers/gpio/max732x.c')
| -rw-r--r-- | drivers/gpio/max732x.c | 714 |
1 files changed, 0 insertions, 714 deletions
diff --git a/drivers/gpio/max732x.c b/drivers/gpio/max732x.c deleted file mode 100644 index 9cad60f9e96..00000000000 --- a/drivers/gpio/max732x.c +++ /dev/null @@ -1,714 +0,0 @@ -/* - * max732x.c - I2C Port Expander with 8/16 I/O - * - * Copyright (C) 2007 Marvell International Ltd. - * Copyright (C) 2008 Jack Ren <jack.ren@marvell.com> - * Copyright (C) 2008 Eric Miao <eric.miao@marvell.com> - * - * Derived from drivers/gpio/pca953x.c - * - * 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; version 2 of the License. - */ - -#include <linux/module.h> -#include <linux/init.h> -#include <linux/slab.h> -#include <linux/string.h> -#include <linux/gpio.h> -#include <linux/interrupt.h> -#include <linux/irq.h> -#include <linux/i2c.h> -#include <linux/i2c/max732x.h> - - -/* - * Each port of MAX732x (including MAX7319) falls into one of the - * following three types: - * - * - Push Pull Output - * - Input - * - Open Drain I/O - * - * designated by 'O', 'I' and 'P' individually according to MAXIM's - * datasheets. 'I' and 'P' ports are interrupt capables, some with - * a dedicated interrupt mask. - * - * There are two groups of I/O ports, each group usually includes - * up to 8 I/O ports, and is accessed by a specific I2C address: - * - * - Group A : by I2C address 0b'110xxxx - * - Group B : by I2C address 0b'101xxxx - * - * where 'xxxx' is decided by the connections of pin AD2/AD0. The - * address used also affects the initial state of output signals. - * - * Within each group of ports, there are five known combinations of - * I/O ports: 4I4O, 4P4O, 8I, 8P, 8O, see the definitions below for - * the detailed organization of these ports. Only Goup A is interrupt - * capable. - * - * GPIO numbers start from 'gpio_base + 0' to 'gpio_base + 8/16', - * and GPIOs from GROUP_A are numbered before those from GROUP_B - * (if there are two groups). - * - * NOTE: MAX7328/MAX7329 are drop-in replacements for PCF8574/a, so - * they are not supported by this driver. - */ - -#define PORT_NONE 0x0 /* '/' No Port */ -#define PORT_OUTPUT 0x1 /* 'O' Push-Pull, Output Only */ -#define PORT_INPUT 0x2 /* 'I' Input Only */ -#define PORT_OPENDRAIN 0x3 /* 'P' Open-Drain, I/O */ - -#define IO_4I4O 0x5AA5 /* O7 O6 I5 I4 I3 I2 O1 O0 */ -#define IO_4P4O 0x5FF5 /* O7 O6 P5 P4 P3 P2 O1 O0 */ -#define IO_8I 0xAAAA /* I7 I6 I5 I4 I3 I2 I1 I0 */ -#define IO_8P 0xFFFF /* P7 P6 P5 P4 P3 P2 P1 P0 */ -#define IO_8O 0x5555 /* O7 O6 O5 O4 O3 O2 O1 O0 */ - -#define GROUP_A(x) ((x) & 0xffff) /* I2C Addr: 0b'110xxxx */ -#define GROUP_B(x) ((x) << 16) /* I2C Addr: 0b'101xxxx */ - -#define INT_NONE 0x0 /* No interrupt capability */ -#define INT_NO_MASK 0x1 /* Has interrupts, no mask */ -#define INT_INDEP_MASK 0x2 /* Has interrupts, independent mask */ -#define INT_MERGED_MASK 0x3 /* Has interrupts, merged mask */ - -#define INT_CAPS(x) (((uint64_t)(x)) << 32) - -enum { - MAX7319, - MAX7320, - MAX7321, - MAX7322, - MAX7323, - MAX7324, - MAX7325, - MAX7326, - MAX7327, -}; - -static uint64_t max732x_features[] = { - [MAX7319] = GROUP_A(IO_8I) | INT_CAPS(INT_MERGED_MASK), - [MAX7320] = GROUP_B(IO_8O), - [MAX7321] = GROUP_A(IO_8P) | INT_CAPS(INT_NO_MASK), - [MAX7322] = GROUP_A(IO_4I4O) | INT_CAPS(INT_MERGED_MASK), - [MAX7323] = GROUP_A(IO_4P4O) | INT_CAPS(INT_INDEP_MASK), - [MAX7324] = GROUP_A(IO_8I) | GROUP_B(IO_8O) | INT_CAPS(INT_MERGED_MASK), - [MAX7325] = GROUP_A(IO_8P) | GROUP_B(IO_8O) | INT_CAPS(INT_NO_MASK), - [MAX7326] = GROUP_A(IO_4I4O) | GROUP_B(IO_8O) | INT_CAPS(INT_MERGED_MASK), - [MAX7327] = GROUP_A(IO_4P4O) | GROUP_B(IO_8O) | INT_CAPS(INT_NO_MASK), -}; - -static const struct i2c_device_id max732x_id[] = { - { "max7319", MAX7319 }, - { "max7320", MAX7320 }, - { "max7321", MAX7321 }, - { "max7322", MAX7322 }, - { "max7323", MAX7323 }, - { "max7324", MAX7324 }, - { "max7325", MAX7325 }, - { "max7326", MAX7326 }, - { "max7327", MAX7327 }, - { }, -}; -MODULE_DEVICE_TABLE(i2c, max732x_id); - -struct max732x_chip { - struct gpio_chip gpio_chip; - - struct i2c_client *client; /* "main" client */ - struct i2c_client *client_dummy; - struct i2c_client *client_group_a; - struct i2c_client *client_group_b; - - unsigned int mask_group_a; - unsigned int dir_input; - unsigned int dir_output; - - struct mutex lock; - uint8_t reg_out[2]; - -#ifdef CONFIG_GPIO_MAX732X_IRQ - struct mutex irq_lock; - int irq_base; - uint8_t irq_mask; - uint8_t irq_mask_cur; - uint8_t irq_trig_raise; - uint8_t irq_trig_fall; - uint8_t irq_features; -#endif -}; - -static int max732x_writeb(struct max732x_chip *chip, int group_a, uint8_t val) -{ - struct i2c_client *client; - int ret; - - client = group_a ? chip->client_group_a : chip->client_group_b; - ret = i2c_smbus_write_byte(client, val); - if (ret < 0) { - dev_err(&client->dev, "failed writing\n"); - return ret; - } - - return 0; -} - -static int max732x_readb(struct max732x_chip *chip, int group_a, uint8_t *val) -{ - struct i2c_client *client; - int ret; - - client = group_a ? chip->client_group_a : chip->client_group_b; - ret = i2c_smbus_read_byte(client); - if (ret < 0) { - dev_err(&client->dev, "failed reading\n"); - return ret; - } - - *val = (uint8_t)ret; - return 0; -} - -static inline int is_group_a(struct max732x_chip *chip, unsigned off) -{ - return (1u << off) & chip->mask_group_a; -} - -static int max732x_gpio_get_value(struct gpio_chip *gc, unsigned off) -{ - struct max732x_chip *chip; - uint8_t reg_val; - int ret; - - chip = container_of(gc, struct max732x_chip, gpio_chip); - - ret = max732x_readb(chip, is_group_a(chip, off), ®_val); - if (ret < 0) - return 0; - - return reg_val & (1u << (off & 0x7)); -} - -static void max732x_gpio_set_value(struct gpio_chip *gc, unsigned off, int val) -{ - struct max732x_chip *chip; - uint8_t reg_out, mask = 1u << (off & 0x7); - int ret; - - chip = container_of(gc, struct max732x_chip, gpio_chip); - - mutex_lock(&chip->lock); - - reg_out = (off > 7) ? chip->reg_out[1] : chip->reg_out[0]; - reg_out = (val) ? reg_out | mask : reg_out & ~mask; - - ret = max732x_writeb(chip, is_group_a(chip, off), reg_out); - if (ret < 0) - goto out; - - /* update the shadow register then */ - if (off > 7) - chip->reg_out[1] = reg_out; - else - chip->reg_out[0] = reg_out; -out: - mutex_unlock(&chip->lock); -} - -static int max732x_gpio_direction_input(struct gpio_chip *gc, unsigned off) -{ - struct max732x_chip *chip; - unsigned int mask = 1u << off; - - chip = container_of(gc, struct max732x_chip, gpio_chip); - - if ((mask & chip->dir_input) == 0) { - dev_dbg(&chip->client->dev, "%s port %d is output only\n", - chip->client->name, off); - return -EACCES; - } - - /* - * Open-drain pins must be set to high impedance (which is - * equivalent to output-high) to be turned into an input. - */ - if ((mask & chip->dir_output)) - max732x_gpio_set_value(gc, off, 1); - - return 0; -} - -static int max732x_gpio_direction_output(struct gpio_chip *gc, - unsigned off, int val) -{ - struct max732x_chip *chip; - unsigned int mask = 1u << off; - - chip = container_of(gc, struct max732x_chip, gpio_chip); - - if ((mask & chip->dir_output) == 0) { - dev_dbg(&chip->client->dev, "%s port %d is input only\n", - chip->client->name, off); - return -EACCES; - } - - max732x_gpio_set_value(gc, off, val); - return 0; -} - -#ifdef CONFIG_GPIO_MAX732X_IRQ -static int max732x_writew(struct max732x_chip *chip, uint16_t val) -{ - int ret; - - val = cpu_to_le16(val); - - ret = i2c_master_send(chip->client_group_a, (char *)&val, 2); - if (ret < 0) { - dev_err(&chip->client_group_a->dev, "failed writing\n"); - return ret; - } - - return 0; -} - -static int max732x_readw(struct max732x_chip *chip, uint16_t *val) -{ - int ret; - - ret = i2c_master_recv(chip->client_group_a, (char *)val, 2); - if (ret < 0) { - dev_err(&chip->client_group_a->dev, "failed reading\n"); - return ret; - } - - *val = le16_to_cpu(*val); - return 0; -} - -static void max732x_irq_update_mask(struct max732x_chip *chip) -{ - uint16_t msg; - - if (chip->irq_mask == chip->irq_mask_cur) - return; - - chip->irq_mask = chip->irq_mask_cur; - - if (chip->irq_features == INT_NO_MASK) - return; - - mutex_lock(&chip->lock); - - switch (chip->irq_features) { - case INT_INDEP_MASK: - msg = (chip->irq_mask << 8) | chip->reg_out[0]; - max732x_writew(chip, msg); - break; - - case INT_MERGED_MASK: - msg = chip->irq_mask | chip->reg_out[0]; - max732x_writeb(chip, 1, (uint8_t)msg); - break; - } - - mutex_unlock(&chip->lock); -} - -static int max732x_gpio_to_irq(struct gpio_chip *gc, unsigned off) -{ - struct max732x_chip *chip; - - chip = container_of(gc, struct max732x_chip, gpio_chip); - return chip->irq_base + off; -} - -static void max732x_irq_mask(unsigned int irq) -{ - struct max732x_chip *chip = get_irq_chip_data(irq); - - chip->irq_mask_cur &= ~(1 << (irq - chip->irq_base)); -} - -static void max732x_irq_unmask(unsigned int irq) -{ - struct max732x_chip *chip = get_irq_chip_data(irq); - - chip->irq_mask_cur |= 1 << (irq - chip->irq_base); -} - -static void max732x_irq_bus_lock(unsigned int irq) -{ - struct max732x_chip *chip = get_irq_chip_data(irq); - - mutex_lock(&chip->irq_lock); - chip->irq_mask_cur = chip->irq_mask; -} - -static void max732x_irq_bus_sync_unlock(unsigned int irq) -{ - struct max732x_chip *chip = get_irq_chip_data(irq); - - max732x_irq_update_mask(chip); - mutex_unlock(&chip->irq_lock); -} - -static int max732x_irq_set_type(unsigned int irq, unsigned int type) -{ - struct max732x_chip *chip = get_irq_chip_data(irq); - uint16_t off = irq - chip->irq_base; - uint16_t mask = 1 << off; - - if (!(mask & chip->dir_input)) { - dev_dbg(&chip->client->dev, "%s port %d is output only\n", - chip->client->name, off); - return -EACCES; - } - - if (!(type & IRQ_TYPE_EDGE_BOTH)) { - dev_err(&chip->client->dev, "irq %d: unsupported type %d\n", - irq, type); - return -EINVAL; - } - - if (type & IRQ_TYPE_EDGE_FALLING) - chip->irq_trig_fall |= mask; - else - chip->irq_trig_fall &= ~mask; - - if (type & IRQ_TYPE_EDGE_RISING) - chip->irq_trig_raise |= mask; - else - chip->irq_trig_raise &= ~mask; - - return max732x_gpio_direction_input(&chip->gpio_chip, off); -} - -static struct irq_chip max732x_irq_chip = { - .name = "max732x", - .mask = max732x_irq_mask, - .unmask = max732x_irq_unmask, - .bus_lock = max732x_irq_bus_lock, - .bus_sync_unlock = max732x_irq_bus_sync_unlock, - .set_type = max732x_irq_set_type, -}; - -static uint8_t max732x_irq_pending(struct max732x_chip *chip) -{ - uint8_t cur_stat; - uint8_t old_stat; - uint8_t trigger; - uint8_t pending; - uint16_t status; - int ret; - - ret = max732x_readw(chip, &status); - if (ret) - return 0; - - trigger = status >> 8; - trigger &= chip->irq_mask; - - if (!trigger) - return 0; - - cur_stat = status & 0xFF; - cur_stat &= chip->irq_mask; - - old_stat = cur_stat ^ trigger; - - pending = (old_stat & chip->irq_trig_fall) | - (cur_stat & chip->irq_trig_raise); - pending &= trigger; - - return pending; -} - -static irqreturn_t max732x_irq_handler(int irq, void *devid) -{ - struct max732x_chip *chip = devid; - uint8_t pending; - uint8_t level; - - pending = max732x_irq_pending(chip); - - if (!pending) - return IRQ_HANDLED; - - do { - level = __ffs(pending); - handle_nested_irq(level + chip->irq_base); - - pending &= ~(1 << level); - } while (pending); - - return IRQ_HANDLED; -} - -static int max732x_irq_setup(struct max732x_chip *chip, - const struct i2c_device_id *id) -{ - struct i2c_client *client = chip->client; - struct max732x_platform_data *pdata = client->dev.platform_data; - int has_irq = max732x_features[id->driver_data] >> 32; - int ret; - - if (pdata->irq_base && has_irq != INT_NONE) { - int lvl; - - chip->irq_base = pdata->irq_base; - chip->irq_features = has_irq; - mutex_init(&chip->irq_lock); - - for (lvl = 0; lvl < chip->gpio_chip.ngpio; lvl++) { - int irq = lvl + chip->irq_base; - - if (!(chip->dir_input & (1 << lvl))) - continue; - - set_irq_chip_data(irq, chip); - set_irq_chip_and_handler(irq, &max732x_irq_chip, - handle_edge_irq); - set_irq_nested_thread(irq, 1); -#ifdef CONFIG_ARM - set_irq_flags(irq, IRQF_VALID); -#else - set_irq_noprobe(irq); -#endif - } - - ret = request_threaded_irq(client->irq, - NULL, - max732x_irq_handler, - IRQF_TRIGGER_FALLING | IRQF_ONESHOT, - dev_name(&client->dev), chip); - if (ret) { - dev_err(&client->dev, "failed to request irq %d\n", - client->irq); - goto out_failed; - } - - chip->gpio_chip.to_irq = max732x_gpio_to_irq; - } - - return 0; - -out_failed: - chip->irq_base = 0; - return ret; -} - -static void max732x_irq_teardown(struct max732x_chip *chip) -{ - if (chip->irq_base) - free_irq(chip->client->irq, chip); -} -#else /* CONFIG_GPIO_MAX732X_IRQ */ -static int max732x_irq_setup(struct max732x_chip *chip, - const struct i2c_device_id *id) -{ - struct i2c_client *client = chip->client; - struct max732x_platform_data *pdata = client->dev.platform_data; - int has_irq = max732x_features[id->driver_data] >> 32; - - if (pdata->irq_base && has_irq != INT_NONE) - dev_warn(&client->dev, "interrupt support not compiled in\n"); - - return 0; -} - -static void max732x_irq_teardown(struct max732x_chip *chip) -{ -} -#endif - -static int __devinit max732x_setup_gpio(struct max732x_chip *chip, - const struct i2c_device_id *id, - unsigned gpio_start) -{ - struct gpio_chip *gc = &chip->gpio_chip; - uint32_t id_data = (uint32_t)max732x_features[id->driver_data]; - int i, port = 0; - - for (i = 0; i < 16; i++, id_data >>= 2) { - unsigned int mask = 1 << port; - - switch (id_data & 0x3) { - case PORT_OUTPUT: - chip->dir_output |= mask; - break; - case PORT_INPUT: - chip->dir_input |= mask; - break; - case PORT_OPENDRAIN: - chip->dir_output |= mask; - chip->dir_input |= mask; - break; - default: - continue; - } - - if (i < 8) - chip->mask_group_a |= mask; - port++; - } - - if (chip->dir_input) - gc->direction_input = max732x_gpio_direction_input; - if (chip->dir_output) { - gc->direction_output = max732x_gpio_direction_output; - gc->set = max732x_gpio_set_value; - } - gc->get = max732x_gpio_get_value; - gc->can_sleep = 1; - - gc->base = gpio_start; - gc->ngpio = port; - gc->label = chip->client->name; - gc->owner = THIS_MODULE; - - return port; -} - -static int __devinit max732x_probe(struct i2c_client *client, - const struct i2c_device_id *id) -{ - struct max732x_platform_data *pdata; - struct max732x_chip *chip; - struct i2c_client *c; - uint16_t addr_a, addr_b; - int ret, nr_port; - - pdata = client->dev.platform_data; - if (pdata == NULL) { - dev_dbg(&client->dev, "no platform data\n"); - return -EINVAL; - } - - chip = kzalloc(sizeof(struct max732x_chip), GFP_KERNEL); - if (chip == NULL) - return -ENOMEM; - chip->client = client; - - nr_port = max732x_setup_gpio(chip, id, pdata->gpio_base); - - addr_a = (client->addr & 0x0f) | 0x60; - addr_b = (client->addr & 0x0f) | 0x50; - - switch (client->addr & 0x70) { - case 0x60: - chip->client_group_a = client; - if (nr_port > 8) { - c = i2c_new_dummy(client->adapter, addr_b); - chip->client_group_b = chip->client_dummy = c; - } - break; - case 0x50: - chip->client_group_b = client; - if (nr_port > 8) { - c = i2c_new_dummy(client->adapter, addr_a); - chip->client_group_a = chip->client_dummy = c; - } - break; - default: - dev_err(&client->dev, "invalid I2C address specified %02x\n", - client->addr); - ret = -EINVAL; - goto out_failed; - } - - mutex_init(&chip->lock); - - max732x_readb(chip, is_group_a(chip, 0), &chip->reg_out[0]); - if (nr_port > 8) - max732x_readb(chip, is_group_a(chip, 8), &chip->reg_out[1]); - - ret = max732x_irq_setup(chip, id); - if (ret) - goto out_failed; - - ret = gpiochip_add(&chip->gpio_chip); - if (ret) - goto out_failed; - - if (pdata->setup) { - ret = pdata->setup(client, chip->gpio_chip.base, - chip->gpio_chip.ngpio, pdata->context); - if (ret < 0) - dev_warn(&client->dev, "setup failed, %d\n", ret); - } - - i2c_set_clientdata(client, chip); - return 0; - -out_failed: - max732x_irq_teardown(chip); - kfree(chip); - return ret; -} - -static int __devexit max732x_remove(struct i2c_client *client) -{ - struct max732x_platform_data *pdata = client->dev.platform_data; - struct max732x_chip *chip = i2c_get_clientdata(client); - int ret; - - if (pdata->teardown) { - ret = pdata->teardown(client, chip->gpio_chip.base, - chip->gpio_chip.ngpio, pdata->context); - if (ret < 0) { - dev_err(&client->dev, "%s failed, %d\n", - "teardown", ret); - return ret; - } - } - - ret = gpiochip_remove(&chip->gpio_chip); - if (ret) { - dev_err(&client->dev, "%s failed, %d\n", - "gpiochip_remove()", ret); - return ret; - } - - max732x_irq_teardown(chip); - - /* unregister any dummy i2c_client */ - if (chip->client_dummy) - i2c_unregister_device(chip->client_dummy); - - kfree(chip); - return 0; -} - -static struct i2c_driver max732x_driver = { - .driver = { - .name = "max732x", - .owner = THIS_MODULE, - }, - .probe = max732x_probe, - .remove = __devexit_p(max732x_remove), - .id_table = max732x_id, -}; - -static int __init max732x_init(void) -{ - return i2c_add_driver(&max732x_driver); -} -/* register after i2c postcore initcall and before - * subsys initcalls that may rely on these GPIOs - */ -subsys_initcall(max732x_init); - -static void __exit max732x_exit(void) -{ - i2c_del_driver(&max732x_driver); -} -module_exit(max732x_exit); - -MODULE_AUTHOR("Eric Miao <eric.miao@marvell.com>"); -MODULE_DESCRIPTION("GPIO expander driver for MAX732X"); -MODULE_LICENSE("GPL"); |