diff options
Diffstat (limited to 'drivers/gpio/74x164.c')
| -rw-r--r-- | drivers/gpio/74x164.c | 182 |
1 files changed, 0 insertions, 182 deletions
diff --git a/drivers/gpio/74x164.c b/drivers/gpio/74x164.c deleted file mode 100644 index d91ff4c282e..00000000000 --- a/drivers/gpio/74x164.c +++ /dev/null @@ -1,182 +0,0 @@ -/* - * 74Hx164 - Generic serial-in/parallel-out 8-bits shift register GPIO driver - * - * Copyright (C) 2010 Gabor Juhos <juhosg@openwrt.org> - * Copyright (C) 2010 Miguel Gaio <miguel.gaio@efixo.com> - * - * 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/init.h> -#include <linux/mutex.h> -#include <linux/spi/spi.h> -#include <linux/spi/74x164.h> -#include <linux/gpio.h> -#include <linux/slab.h> - -#define GEN_74X164_GPIO_COUNT 8 - - -struct gen_74x164_chip { - struct spi_device *spi; - struct gpio_chip gpio_chip; - struct mutex lock; - u8 port_config; -}; - -static void gen_74x164_set_value(struct gpio_chip *, unsigned, int); - -static struct gen_74x164_chip *gpio_to_chip(struct gpio_chip *gc) -{ - return container_of(gc, struct gen_74x164_chip, gpio_chip); -} - -static int __gen_74x164_write_config(struct gen_74x164_chip *chip) -{ - return spi_write(chip->spi, - &chip->port_config, sizeof(chip->port_config)); -} - -static int gen_74x164_direction_output(struct gpio_chip *gc, - unsigned offset, int val) -{ - gen_74x164_set_value(gc, offset, val); - return 0; -} - -static int gen_74x164_get_value(struct gpio_chip *gc, unsigned offset) -{ - struct gen_74x164_chip *chip = gpio_to_chip(gc); - int ret; - - mutex_lock(&chip->lock); - ret = (chip->port_config >> offset) & 0x1; - mutex_unlock(&chip->lock); - - return ret; -} - -static void gen_74x164_set_value(struct gpio_chip *gc, - unsigned offset, int val) -{ - struct gen_74x164_chip *chip = gpio_to_chip(gc); - - mutex_lock(&chip->lock); - if (val) - chip->port_config |= (1 << offset); - else - chip->port_config &= ~(1 << offset); - - __gen_74x164_write_config(chip); - mutex_unlock(&chip->lock); -} - -static int __devinit gen_74x164_probe(struct spi_device *spi) -{ - struct gen_74x164_chip *chip; - struct gen_74x164_chip_platform_data *pdata; - int ret; - - pdata = spi->dev.platform_data; - if (!pdata || !pdata->base) { - dev_dbg(&spi->dev, "incorrect or missing platform data\n"); - return -EINVAL; - } - - /* - * bits_per_word cannot be configured in platform data - */ - spi->bits_per_word = 8; - - ret = spi_setup(spi); - if (ret < 0) - return ret; - - chip = kzalloc(sizeof(*chip), GFP_KERNEL); - if (!chip) - return -ENOMEM; - - mutex_init(&chip->lock); - - dev_set_drvdata(&spi->dev, chip); - - chip->spi = spi; - - chip->gpio_chip.label = GEN_74X164_DRIVER_NAME, - chip->gpio_chip.direction_output = gen_74x164_direction_output; - chip->gpio_chip.get = gen_74x164_get_value; - chip->gpio_chip.set = gen_74x164_set_value; - chip->gpio_chip.base = pdata->base; - chip->gpio_chip.ngpio = GEN_74X164_GPIO_COUNT; - chip->gpio_chip.can_sleep = 1; - chip->gpio_chip.dev = &spi->dev; - chip->gpio_chip.owner = THIS_MODULE; - - ret = __gen_74x164_write_config(chip); - if (ret) { - dev_err(&spi->dev, "Failed writing: %d\n", ret); - goto exit_destroy; - } - - ret = gpiochip_add(&chip->gpio_chip); - if (ret) - goto exit_destroy; - - return ret; - -exit_destroy: - dev_set_drvdata(&spi->dev, NULL); - mutex_destroy(&chip->lock); - kfree(chip); - return ret; -} - -static int gen_74x164_remove(struct spi_device *spi) -{ - struct gen_74x164_chip *chip; - int ret; - - chip = dev_get_drvdata(&spi->dev); - if (chip == NULL) - return -ENODEV; - - dev_set_drvdata(&spi->dev, NULL); - - ret = gpiochip_remove(&chip->gpio_chip); - if (!ret) { - mutex_destroy(&chip->lock); - kfree(chip); - } else - dev_err(&spi->dev, "Failed to remove the GPIO controller: %d\n", - ret); - - return ret; -} - -static struct spi_driver gen_74x164_driver = { - .driver = { - .name = GEN_74X164_DRIVER_NAME, - .owner = THIS_MODULE, - }, - .probe = gen_74x164_probe, - .remove = __devexit_p(gen_74x164_remove), -}; - -static int __init gen_74x164_init(void) -{ - return spi_register_driver(&gen_74x164_driver); -} -subsys_initcall(gen_74x164_init); - -static void __exit gen_74x164_exit(void) -{ - spi_unregister_driver(&gen_74x164_driver); -} -module_exit(gen_74x164_exit); - -MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>"); -MODULE_AUTHOR("Miguel Gaio <miguel.gaio@efixo.com>"); -MODULE_DESCRIPTION("GPIO expander driver for 74X164 8-bits shift register"); -MODULE_LICENSE("GPL v2"); |