include/linux/leds.h

   1 /*
   2  * Driver model for leds and led triggers
   3  *
   4  * Copyright (C) 2005 John Lenz <lenz@cs.wisc.edu>
   5  * Copyright (C) 2005 Richard Purdie <rpurdie@openedhand.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  *
  11  */
  12 #ifndef __LINUX_LEDS_H_INCLUDED
  13 #define __LINUX_LEDS_H_INCLUDED
  14
  15 struct device;
  16 struct class_device;
  17 /*
  18  * LED Core
  19  */
  20
  21 enum led_brightness {
  22         LED_OFF         = 0,
  23         LED_HALF        = 127,
  24         LED_FULL        = 255,
  25 };
  26
  27 struct led_classdev {
  28         const char              *name;
  29         int                      brightness;
  30         int                      flags;
  31
  32 #define LED_SUSPENDED           (1 << 0)
  33
  34         /* Set LED brightness level */
  35         void            (*brightness_set)(struct led_classdev *led_cdev,
  36                                           enum led_brightness brightness);
  37
  38         struct class_device     *class_dev;
  39         struct list_head         node;                  /* LED Device list */
  40         char                    *default_trigger;       /* Trigger to use */
  41
  42 #ifdef CONFIG_LEDS_TRIGGERS
  43         /* Protects the trigger data below */
  44         rwlock_t                 trigger_lock;
  45
  46         struct led_trigger      *trigger;
  47         struct list_head         trig_list;
  48         void                    *trigger_data;
  49 #endif
  50 };
  51
  52 extern int led_classdev_register(struct device *parent,
  53                                  struct led_classdev *led_cdev);
  54 extern void led_classdev_unregister(struct led_classdev *led_cdev);
  55 extern void led_classdev_suspend(struct led_classdev *led_cdev);
  56 extern void led_classdev_resume(struct led_classdev *led_cdev);
  57
  58 /*
  59  * LED Triggers
  60  */
  61 #ifdef CONFIG_LEDS_TRIGGERS
  62
  63 #define TRIG_NAME_MAX 50
  64
  65 struct led_trigger {
  66         /* Trigger Properties */
  67         const char       *name;
  68         void            (*activate)(struct led_classdev *led_cdev);
  69         void            (*deactivate)(struct led_classdev *led_cdev);
  70
  71         /* LEDs under control by this trigger (for simple triggers) */
  72         rwlock_t          leddev_list_lock;
  73         struct list_head  led_cdevs;
  74
  75         /* Link to next registered trigger */
  76         struct list_head  next_trig;
  77 };
  78
  79 /* Registration functions for complex triggers */
  80 extern int led_trigger_register(struct led_trigger *trigger);
  81 extern void led_trigger_unregister(struct led_trigger *trigger);
  82
  83 /* Registration functions for simple triggers */
  84 #define DEFINE_LED_TRIGGER(x)           static struct led_trigger *x;
  85 #define DEFINE_LED_TRIGGER_GLOBAL(x)    struct led_trigger *x;
  86 extern void led_trigger_register_simple(const char *name,
  87                                 struct led_trigger **trigger);
  88 extern void led_trigger_unregister_simple(struct led_trigger *trigger);
  89 extern void led_trigger_event(struct led_trigger *trigger,
  90                                 enum led_brightness event);
  91
  92 #else
  93
  94 /* Triggers aren't active - null macros */
  95 #define DEFINE_LED_TRIGGER(x)
  96 #define DEFINE_LED_TRIGGER_GLOBAL(x)
  97 #define led_trigger_register_simple(x, y) do {} while(0)
  98 #define led_trigger_unregister_simple(x) do {} while(0)
  99 #define led_trigger_event(x, y) do {} while(0)
 100
 101 #endif
 102
 103 /* Trigger specific functions */
 104 #ifdef CONFIG_LEDS_TRIGGER_IDE_DISK
 105 extern void ledtrig_ide_activity(void);
 106 #else
 107 #define ledtrig_ide_activity() do {} while(0)
 108 #endif
 109
 110 #endif          /* __LINUX_LEDS_H_INCLUDED */