diff options
Diffstat (limited to 'drivers/gpio/adp5588-gpio.c')
| -rw-r--r-- | drivers/gpio/adp5588-gpio.c | 266 |
1 files changed, 266 insertions, 0 deletions
diff --git a/drivers/gpio/adp5588-gpio.c b/drivers/gpio/adp5588-gpio.c new file mode 100644 index 00000000000..afc097a16b3 --- /dev/null +++ b/drivers/gpio/adp5588-gpio.c @@ -0,0 +1,266 @@ +/* + * GPIO Chip driver for Analog Devices + * ADP5588 I/O Expander and QWERTY Keypad Controller + * + * Copyright 2009 Analog Devices Inc. + * + * Licensed under the GPL-2 or later. + */ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/i2c.h> +#include <linux/gpio.h> + +#include <linux/i2c/adp5588.h> + +#define DRV_NAME "adp5588-gpio" +#define MAXGPIO 18 +#define ADP_BANK(offs) ((offs) >> 3) +#define ADP_BIT(offs) (1u << ((offs) & 0x7)) + +struct adp5588_gpio { + struct i2c_client *client; + struct gpio_chip gpio_chip; + struct mutex lock; /* protect cached dir, dat_out */ + unsigned gpio_start; + uint8_t dat_out[3]; + uint8_t dir[3]; +}; + +static int adp5588_gpio_read(struct i2c_client *client, u8 reg) +{ + int ret = i2c_smbus_read_byte_data(client, reg); + + if (ret < 0) + dev_err(&client->dev, "Read Error\n"); + + return ret; +} + +static int adp5588_gpio_write(struct i2c_client *client, u8 reg, u8 val) +{ + int ret = i2c_smbus_write_byte_data(client, reg, val); + + if (ret < 0) + dev_err(&client->dev, "Write Error\n"); + + return ret; +} + +static int adp5588_gpio_get_value(struct gpio_chip *chip, unsigned off) +{ + struct adp5588_gpio *dev = + container_of(chip, struct adp5588_gpio, gpio_chip); + + return !!(adp5588_gpio_read(dev->client, GPIO_DAT_STAT1 + ADP_BANK(off)) + & ADP_BIT(off)); +} + +static void adp5588_gpio_set_value(struct gpio_chip *chip, + unsigned off, int val) +{ + unsigned bank, bit; + struct adp5588_gpio *dev = + container_of(chip, struct adp5588_gpio, gpio_chip); + + bank = ADP_BANK(off); + bit = ADP_BIT(off); + + mutex_lock(&dev->lock); + if (val) + dev->dat_out[bank] |= bit; + else + dev->dat_out[bank] &= ~bit; + + adp5588_gpio_write(dev->client, GPIO_DAT_OUT1 + bank, + dev->dat_out[bank]); + mutex_unlock(&dev->lock); +} + +static int adp5588_gpio_direction_input(struct gpio_chip *chip, unsigned off) +{ + int ret; + unsigned bank; + struct adp5588_gpio *dev = + container_of(chip, struct adp5588_gpio, gpio_chip); + + bank = ADP_BANK(off); + + mutex_lock(&dev->lock); + dev->dir[bank] &= ~ADP_BIT(off); + ret = adp5588_gpio_write(dev->client, GPIO_DIR1 + bank, dev->dir[bank]); + mutex_unlock(&dev->lock); + + return ret; +} + +static int adp5588_gpio_direction_output(struct gpio_chip *chip, + unsigned off, int val) +{ + int ret; + unsigned bank, bit; + struct adp5588_gpio *dev = + container_of(chip, struct adp5588_gpio, gpio_chip); + + bank = ADP_BANK(off); + bit = ADP_BIT(off); + + mutex_lock(&dev->lock); + dev->dir[bank] |= bit; + + if (val) + dev->dat_out[bank] |= bit; + else + dev->dat_out[bank] &= ~bit; + + ret = adp5588_gpio_write(dev->client, GPIO_DAT_OUT1 + bank, + dev->dat_out[bank]); + ret |= adp5588_gpio_write(dev->client, GPIO_DIR1 + bank, + dev->dir[bank]); + mutex_unlock(&dev->lock); + + return ret; +} + +static int __devinit adp5588_gpio_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct adp5588_gpio_platform_data *pdata = client->dev.platform_data; + struct adp5588_gpio *dev; + struct gpio_chip *gc; + int ret, i, revid; + + if (pdata == NULL) { + dev_err(&client->dev, "missing platform data\n"); + return -ENODEV; + } + + if (!i2c_check_functionality(client->adapter, + I2C_FUNC_SMBUS_BYTE_DATA)) { + dev_err(&client->dev, "SMBUS Byte Data not Supported\n"); + return -EIO; + } + + dev = kzalloc(sizeof(*dev), GFP_KERNEL); + if (dev == NULL) { + dev_err(&client->dev, "failed to alloc memory\n"); + return -ENOMEM; + } + + dev->client = client; + + gc = &dev->gpio_chip; + gc->direction_input = adp5588_gpio_direction_input; + gc->direction_output = adp5588_gpio_direction_output; + gc->get = adp5588_gpio_get_value; + gc->set = adp5588_gpio_set_value; + gc->can_sleep = 1; + + gc->base = pdata->gpio_start; + gc->ngpio = MAXGPIO; + gc->label = client->name; + gc->owner = THIS_MODULE; + + mutex_init(&dev->lock); + + + ret = adp5588_gpio_read(dev->client, DEV_ID); + if (ret < 0) + goto err; + + revid = ret & ADP5588_DEVICE_ID_MASK; + + for (i = 0, ret = 0; i <= ADP_BANK(MAXGPIO); i++) { + dev->dat_out[i] = adp5588_gpio_read(client, GPIO_DAT_OUT1 + i); + dev->dir[i] = adp5588_gpio_read(client, GPIO_DIR1 + i); + ret |= adp5588_gpio_write(client, KP_GPIO1 + i, 0); + ret |= adp5588_gpio_write(client, GPIO_PULL1 + i, + (pdata->pullup_dis_mask >> (8 * i)) & 0xFF); + + if (ret) + goto err; + } + + ret = gpiochip_add(&dev->gpio_chip); + if (ret) + goto err; + + dev_info(&client->dev, "gpios %d..%d on a %s Rev. %d\n", + gc->base, gc->base + gc->ngpio - 1, + client->name, revid); + + if (pdata->setup) { + ret = pdata->setup(client, gc->base, gc->ngpio, pdata->context); + if (ret < 0) + dev_warn(&client->dev, "setup failed, %d\n", ret); + } + + i2c_set_clientdata(client, dev); + return 0; + +err: + kfree(dev); + return ret; +} + +static int __devexit adp5588_gpio_remove(struct i2c_client *client) +{ + struct adp5588_gpio_platform_data *pdata = client->dev.platform_data; + struct adp5588_gpio *dev = i2c_get_clientdata(client); + int ret; + + if (pdata->teardown) { + ret = pdata->teardown(client, + dev->gpio_chip.base, dev->gpio_chip.ngpio, + pdata->context); + if (ret < 0) { + dev_err(&client->dev, "teardown failed %d\n", ret); + return ret; + } + } + + ret = gpiochip_remove(&dev->gpio_chip); + if (ret) { + dev_err(&client->dev, "gpiochip_remove failed %d\n", ret); + return ret; + } + + kfree(dev); + return 0; +} + +static const struct i2c_device_id adp5588_gpio_id[] = { + {DRV_NAME, 0}, + {} +}; + +MODULE_DEVICE_TABLE(i2c, adp5588_gpio_id); + +static struct i2c_driver adp5588_gpio_driver = { + .driver = { + .name = DRV_NAME, + }, + .probe = adp5588_gpio_probe, + .remove = __devexit_p(adp5588_gpio_remove), + .id_table = adp5588_gpio_id, +}; + +static int __init adp5588_gpio_init(void) +{ + return i2c_add_driver(&adp5588_gpio_driver); +} + +module_init(adp5588_gpio_init); + +static void __exit adp5588_gpio_exit(void) +{ + i2c_del_driver(&adp5588_gpio_driver); +} + +module_exit(adp5588_gpio_exit); + +MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); +MODULE_DESCRIPTION("GPIO ADP5588 Driver"); +MODULE_LICENSE("GPL"); |