/* 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 <linux/gpio.h>

  #include <linux/slab.h>

  #include <linux/module.h>

  #include <mach/hardware.h>
  #include <mach/regs-gpio.h>
  #include <mach/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
  ");
  		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->cdev.flags |= LED_CORE_SUSPENDRESUME;

  
  	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
  ");

  		kfree(led);
  		return ret;

  	}
  
  	return 0;

  }

  static struct platform_driver s3c24xx_led_driver = {
  	.probe		= s3c24xx_led_probe,
  	.remove		= s3c24xx_led_remove,

  	.driver		= {
  		.name		= "s3c24xx_led",
  		.owner		= THIS_MODULE,
  	},
  };

  module_platform_driver(s3c24xx_led_driver);

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

  MODULE_ALIAS("platform:s3c24xx_led");