linux/drivers/leds/leds.h
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   1/*
   2 * LED Core
   3 *
   4 * Copyright 2005 Openedhand Ltd.
   5 *
   6 * Author: Richard Purdie <rpurdie@openedhand.com>
   7 *
   8 * This program is free software; you can redistribute it and/or modify
   9 * it under the terms of the GNU General Public License version 2 as
  10 * published by the Free Software Foundation.
  11 *
  12 */
  13#ifndef __LEDS_H_INCLUDED
  14#define __LEDS_H_INCLUDED
  15
  16#include <linux/device.h>
  17#include <linux/rwsem.h>
  18#include <linux/leds.h>
  19
  20static inline void __led_set_brightness(struct led_classdev *led_cdev,
  21                                        enum led_brightness value)
  22{
  23        if (value > led_cdev->max_brightness)
  24                value = led_cdev->max_brightness;
  25        led_cdev->brightness = value;
  26        if (!(led_cdev->flags & LED_SUSPENDED))
  27                led_cdev->brightness_set(led_cdev, value);
  28}
  29
  30static inline int led_get_brightness(struct led_classdev *led_cdev)
  31{
  32        return led_cdev->brightness;
  33}
  34
  35extern struct rw_semaphore leds_list_lock;
  36extern struct list_head leds_list;
  37
  38#ifdef CONFIG_LEDS_TRIGGERS
  39void led_trigger_set_default(struct led_classdev *led_cdev);
  40void led_trigger_set(struct led_classdev *led_cdev,
  41                        struct led_trigger *trigger);
  42void led_trigger_remove(struct led_classdev *led_cdev);
  43
  44static inline void *led_get_trigger_data(struct led_classdev *led_cdev)
  45{
  46        return led_cdev->trigger_data;
  47}
  48
  49#else
  50#define led_trigger_set_default(x) do {} while (0)
  51#define led_trigger_set(x, y) do {} while (0)
  52#define led_trigger_remove(x) do {} while (0)
  53#define led_get_trigger_data(x) (NULL)
  54#endif
  55
  56ssize_t led_trigger_store(struct device *dev, struct device_attribute *attr,
  57                        const char *buf, size_t count);
  58ssize_t led_trigger_show(struct device *dev, struct device_attribute *attr,
  59                        char *buf);
  60
  61#endif  /* __LEDS_H_INCLUDED */
  62
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