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