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leds-s3c24xx.c

/* 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/init.h>
#include <linux/platform_device.h>
#include <linux/leds.h>

#include <asm/hardware.h>
#include <asm/arch/regs-gpio.h>
#include <asm/arch/leds-gpio.h>

/* our context */

struct s3c24xx_gpio_led {
      struct led_classdev            cdev;
      struct s3c24xx_led_platdata   *pdata;
};

static inline struct s3c24xx_gpio_led *pdev_to_gpio(struct platform_device *dev)
{
      return platform_get_drvdata(dev);
}

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;

      /* there will be a short delay between setting the output and
       * going from output to input when using tristate. */

      s3c2410_gpio_setpin(pd->gpio, (value ? 1 : 0) ^
                      (pd->flags & S3C24XX_LEDF_ACTLOW));

      if (pd->flags & S3C24XX_LEDF_TRISTATE)
            s3c2410_gpio_cfgpin(pd->gpio,
                            value ? S3C2410_GPIO_OUTPUT : S3C2410_GPIO_INPUT);

}

static int s3c24xx_led_remove(struct platform_device *dev)
{
      struct s3c24xx_gpio_led *led = pdev_to_gpio(dev);

      led_classdev_unregister(&led->cdev);
      kfree(led);

      return 0;
}

static int s3c24xx_led_probe(struct platform_device *dev)
{
      struct s3c24xx_led_platdata *pdata = dev->dev.platform_data;
      struct s3c24xx_gpio_led *led;
      int ret;

      led = kzalloc(sizeof(struct s3c24xx_gpio_led), GFP_KERNEL);
      if (led == NULL) {
            dev_err(&dev->dev, "No memory for device\n");
            return -ENOMEM;
      }

      platform_set_drvdata(dev, led);

      led->cdev.brightness_set = s3c24xx_led_set;
      led->cdev.default_trigger = pdata->def_trigger;
      led->cdev.name = pdata->name;

      led->pdata = pdata;

      /* no point in having a pull-up if we are always driving */

      if (pdata->flags & S3C24XX_LEDF_TRISTATE) {
            s3c2410_gpio_setpin(pdata->gpio, 0);
            s3c2410_gpio_cfgpin(pdata->gpio, S3C2410_GPIO_INPUT);
      } else {
            s3c2410_gpio_pullup(pdata->gpio, 0);
            s3c2410_gpio_setpin(pdata->gpio, 0);
            s3c2410_gpio_cfgpin(pdata->gpio, S3C2410_GPIO_OUTPUT);
      }

      /* register our new led device */

      ret = led_classdev_register(&dev->dev, &led->cdev);
      if (ret < 0) {
            dev_err(&dev->dev, "led_classdev_register failed\n");
            goto exit_err1;
      }

      return 0;

 exit_err1:
      kfree(led);
      return ret;
}


#ifdef CONFIG_PM
static int s3c24xx_led_suspend(struct platform_device *dev, pm_message_t state)
{
      struct s3c24xx_gpio_led *led = pdev_to_gpio(dev);

      led_classdev_suspend(&led->cdev);
      return 0;
}

static int s3c24xx_led_resume(struct platform_device *dev)
{
      struct s3c24xx_gpio_led *led = pdev_to_gpio(dev);

      led_classdev_resume(&led->cdev);
      return 0;
}
#else
#define s3c24xx_led_suspend NULL
#define s3c24xx_led_resume NULL
#endif

static struct platform_driver s3c24xx_led_driver = {
      .probe            = s3c24xx_led_probe,
      .remove           = s3c24xx_led_remove,
      .suspend    = s3c24xx_led_suspend,
      .resume           = s3c24xx_led_resume,
      .driver           = {
            .name       = "s3c24xx_led",
            .owner            = THIS_MODULE,
      },
};

static int __init s3c24xx_led_init(void)
{
      return platform_driver_register(&s3c24xx_led_driver);
}

static void __exit s3c24xx_led_exit(void)
{
      platform_driver_unregister(&s3c24xx_led_driver);
}

module_init(s3c24xx_led_init);
module_exit(s3c24xx_led_exit);

MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
MODULE_DESCRIPTION("S3C24XX LED driver");
MODULE_LICENSE("GPL");

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