linux-imx

/* drivers/leds/leds-s3c24xx.c

 *

 * (c) 2006 Simtec Electronics

 *  http://armlinux.simtec.co.uk/

 *  Ben Dooks <ben@simtec.co.uk>

 *

 * S3C24XX - LEDs GPIO 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/platform_device.h>

#include <linux/leds.h>

#include <linux/gpio.h>

#include <linux/slab.h>

#include <linux/module.h>

#include <linux/platform_data/leds-s3c24xx.h>

​

#include <mach/regs-gpio.h>

#include <plat/gpio-cfg.h>

​

/* our context */

​

struct s3c24xx_gpio_led {

    struct led_classdev      cdev;

    struct s3c24xx_led_platdata *pdata;

};

​

static inline struct s3c24xx_gpio_led *to_gpio(struct led_classdev *led_cdev)

{

    return container_of(led_cdev, struct s3c24xx_gpio_led, cdev);

}

​

static void s3c24xx_led_set(struct led_classdev *led_cdev,

                enum led_brightness value)

{

    struct s3c24xx_gpio_led *led = to_gpio(led_cdev);

    struct s3c24xx_led_platdata *pd = led->pdata;

    int state = (value ? 1 : 0) ^ (pd->flags & S3C24XX_LEDF_ACTLOW);

​

    /* there will be a short delay between setting the output and

     * going from output to input when using tristate. */

​

    gpio_set_value(pd->gpio, state);

​

    if (pd->flags & S3C24XX_LEDF_TRISTATE) {

        if (value)

            gpio_direction_output(pd->gpio, state);

        else

            gpio_direction_input(pd->gpio);

    }

}

​

static int s3c24xx_led_probe(struct platform_device *dev)

{

    struct s3c24xx_led_platdata *pdata = dev_get_platdata(&dev->dev);

    struct s3c24xx_gpio_led *led;

    int ret;

​

    led = devm_kzalloc(&dev->dev, sizeof(struct s3c24xx_gpio_led),