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_async(struct led_classdev *led_cdev,
  21                                         enum led_brightness value)
  22 {
  23         led_cdev->brightness = min(value, led_cdev->max_brightness);
  24
  25         if (!(led_cdev->flags & LED_SUSPENDED))
  26                 led_cdev->brightness_set(led_cdev, value);
  27 }
  28
  29 static inline int led_set_brightness_sync(struct led_classdev *led_cdev,
  30                                         enum led_brightness value)
  31 {
  32         int ret = 0;
  33
  34         led_cdev->brightness = min(value, led_cdev->max_brightness);
  35
  36         if (!(led_cdev->flags & LED_SUSPENDED))
  37                 ret = led_cdev->brightness_set_sync(led_cdev,
  38                                                 led_cdev->brightness);
  39         return ret;
  40 }
  41
  42 static inline int led_get_brightness(struct led_classdev *led_cdev)
  43 {
  44         return led_cdev->brightness;
  45 }
  46
  47 void led_stop_software_blink(struct led_classdev *led_cdev);
  48
  49 extern struct rw_semaphore leds_list_lock;
  50 extern struct list_head leds_list;
  51
  52 #ifdef CONFIG_LEDS_TRIGGERS
  53 void led_trigger_set_default(struct led_classdev *led_cdev);
  54 void led_trigger_set(struct led_classdev *led_cdev,
  55                         struct led_trigger *trigger);
  56 void led_trigger_remove(struct led_classdev *led_cdev);
  57
  58 static inline void *led_get_trigger_data(struct led_classdev *led_cdev)
  59 {
  60         return led_cdev->trigger_data;
  61 }
  62
  63 #else
  64 #define led_trigger_set_default(x) do {} while (0)
  65 #define led_trigger_set(x, y) do {} while (0)
  66 #define led_trigger_remove(x) do {} while (0)
  67 #define led_get_trigger_data(x) (NULL)
  68 #endif
  69
  70 ssize_t led_trigger_store(struct device *dev, struct device_attribute *attr,
  71                         const char *buf, size_t count);
  72 ssize_t led_trigger_show(struct device *dev, struct device_attribute *attr,
  73                         char *buf);
  74
  75 #endif  /* __LEDS_H_INCLUDED */