drivers/leds/leds.h

   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
  20 static 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
  30 static inline int led_get_brightness(struct led_classdev *led_cdev)
  31 {
  32         return led_cdev->brightness;
  33 }
  34
  35 extern struct rw_semaphore leds_list_lock;
  36 extern struct list_head leds_list;
  37
  38 #ifdef CONFIG_LEDS_TRIGGERS
  39 void led_trigger_set_default(struct led_classdev *led_cdev);
  40 void led_trigger_set(struct led_classdev *led_cdev,
  41                         struct led_trigger *trigger);
  42 void led_trigger_remove(struct led_classdev *led_cdev);
  43
  44 static 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
  56 ssize_t led_trigger_store(struct device *dev, struct device_attribute *attr,
  57                         const char *buf, size_t count);
  58 ssize_t led_trigger_show(struct device *dev, struct device_attribute *attr,
  59                         char *buf);
  60
  61 #endif  /* __LEDS_H_INCLUDED */