/*
   * LED Class Core
   *
   * Copyright 2005-2006 Openedhand Ltd.
   *
   * Author: Richard Purdie <rpurdie@openedhand.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/kernel.h>
  #include <linux/list.h>
  #include <linux/module.h>

  #include <linux/rwsem.h>

  #include <linux/leds.h>
  #include "leds.h"

  DECLARE_RWSEM(leds_list_lock);

  EXPORT_SYMBOL_GPL(leds_list_lock);

  LIST_HEAD(leds_list);

  EXPORT_SYMBOL_GPL(leds_list);

  static void led_set_software_blink(struct led_classdev *led_cdev,
  				   unsigned long delay_on,
  				   unsigned long delay_off)
  {
  	int current_brightness;
  
  	current_brightness = led_get_brightness(led_cdev);
  	if (current_brightness)
  		led_cdev->blink_brightness = current_brightness;
  	if (!led_cdev->blink_brightness)
  		led_cdev->blink_brightness = led_cdev->max_brightness;

  	led_cdev->blink_delay_on = delay_on;
  	led_cdev->blink_delay_off = delay_off;

  	/* never on - just set to off */
  	if (!delay_on) {
  		__led_set_brightness(led_cdev, LED_OFF);

  		return;

  	}

  
  	/* never off - just set to brightness */
  	if (!delay_off) {

  		__led_set_brightness(led_cdev, led_cdev->blink_brightness);

  		return;
  	}

  	mod_timer(&led_cdev->blink_timer, jiffies + 1);

  }

  static void led_blink_setup(struct led_classdev *led_cdev,

  		     unsigned long *delay_on,
  		     unsigned long *delay_off)

  {

  	if (!(led_cdev->flags & LED_BLINK_ONESHOT) &&
  	    led_cdev->blink_set &&

  	    !led_cdev->blink_set(led_cdev, delay_on, delay_off))
  		return;
  
  	/* blink with 1 Hz as default if nothing specified */
  	if (!*delay_on && !*delay_off)
  		*delay_on = *delay_off = 500;
  
  	led_set_software_blink(led_cdev, *delay_on, *delay_off);
  }

  
  void led_blink_set(struct led_classdev *led_cdev,
  		   unsigned long *delay_on,
  		   unsigned long *delay_off)
  {

  	del_timer_sync(&led_cdev->blink_timer);

  
  	led_cdev->flags &= ~LED_BLINK_ONESHOT;
  	led_cdev->flags &= ~LED_BLINK_ONESHOT_STOP;
  
  	led_blink_setup(led_cdev, delay_on, delay_off);
  }

  EXPORT_SYMBOL(led_blink_set);

  void led_blink_set_oneshot(struct led_classdev *led_cdev,
  			   unsigned long *delay_on,
  			   unsigned long *delay_off,
  			   int invert)
  {
  	if ((led_cdev->flags & LED_BLINK_ONESHOT) &&

  	     timer_pending(&led_cdev->blink_timer))

  		return;
  
  	led_cdev->flags |= LED_BLINK_ONESHOT;
  	led_cdev->flags &= ~LED_BLINK_ONESHOT_STOP;
  
  	if (invert)
  		led_cdev->flags |= LED_BLINK_INVERT;
  	else
  		led_cdev->flags &= ~LED_BLINK_INVERT;
  
  	led_blink_setup(led_cdev, delay_on, delay_off);
  }
  EXPORT_SYMBOL(led_blink_set_oneshot);

  void led_stop_software_blink(struct led_classdev *led_cdev)

  {

  	del_timer_sync(&led_cdev->blink_timer);

  	led_cdev->blink_delay_on = 0;
  	led_cdev->blink_delay_off = 0;

  }
  EXPORT_SYMBOL_GPL(led_stop_software_blink);
  
  void led_set_brightness(struct led_classdev *led_cdev,
  			enum led_brightness brightness)
  {

  	/* delay brightness setting if need to stop soft-blink timer */

  	if (led_cdev->blink_delay_on || led_cdev->blink_delay_off) {
  		led_cdev->delayed_set_value = brightness;
  		schedule_work(&led_cdev->set_brightness_work);
  		return;
  	}

  	__led_set_brightness(led_cdev, brightness);

  }

  EXPORT_SYMBOL(led_set_brightness);