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 #include <linux/list.h>
  16 #include <linux/spinlock.h>
  17 #include <linux/rwsem.h>
  18
  19 struct device;
  20 /*
  21  * LED Core
  22  */
  23
  24 enum led_brightness {
  25         LED_OFF         = 0,
  26         LED_HALF        = 127,
  27         LED_FULL        = 255,
  28 };
  29
  30 struct led_classdev {
  31         const char              *name;
  32         int                      brightness;
  33         int                      flags;
  34
  35 #define LED_SUSPENDED           (1 << 0)
  36
  37         /* Set LED brightness level */
  38         void            (*brightness_set)(struct led_classdev *led_cdev,
  39                                           enum led_brightness brightness);
  40
  41         /* Activate hardware accelerated blink */
  42         int             (*blink_set)(struct led_classdev *led_cdev,
  43                                      unsigned long *delay_on,
  44                                      unsigned long *delay_off);
  45
  46         struct device           *dev;
  47         struct list_head         node;                  /* LED Device list */
  48         char                    *default_trigger;       /* Trigger to use */
  49
  50 #ifdef CONFIG_LEDS_TRIGGERS
  51         /* Protects the trigger data below */
  52         struct rw_semaphore      trigger_lock;
  53
  54         struct led_trigger      *trigger;
  55         struct list_head         trig_list;
  56         void                    *trigger_data;
  57 #endif
  58 };
  59
  60 extern int led_classdev_register(struct device *parent,
  61                                  struct led_classdev *led_cdev);
  62 extern void __led_classdev_unregister(struct led_classdev *led_cdev, bool sus);
  63 static inline void led_classdev_unregister(struct led_classdev *lcd)
  64 {
  65         __led_classdev_unregister(lcd, false);
  66 }
  67 static inline void led_classdev_unregister_suspended(struct led_classdev *lcd)
  68 {
  69         __led_classdev_unregister(lcd, true);
  70 }
  71 extern void led_classdev_suspend(struct led_classdev *led_cdev);
  72 extern void led_classdev_resume(struct led_classdev *led_cdev);
  73
  74 /*
  75  * LED Triggers
  76  */
  77 #ifdef CONFIG_LEDS_TRIGGERS
  78
  79 #define TRIG_NAME_MAX 50
  80
  81 struct led_trigger {
  82         /* Trigger Properties */
  83         const char       *name;
  84         void            (*activate)(struct led_classdev *led_cdev);
  85         void            (*deactivate)(struct led_classdev *led_cdev);
  86
  87         /* LEDs under control by this trigger (for simple triggers) */
  88         rwlock_t          leddev_list_lock;
  89         struct list_head  led_cdevs;
  90
  91         /* Link to next registered trigger */
  92         struct list_head  next_trig;
  93 };
  94
  95 /* Registration functions for complex triggers */
  96 extern int led_trigger_register(struct led_trigger *trigger);
  97 extern void led_trigger_unregister(struct led_trigger *trigger);
  98
  99 /* Registration functions for simple triggers */
 100 #define DEFINE_LED_TRIGGER(x)           static struct led_trigger *x;
 101 #define DEFINE_LED_TRIGGER_GLOBAL(x)    struct led_trigger *x;
 102 extern void led_trigger_register_simple(const char *name,
 103                                 struct led_trigger **trigger);
 104 extern void led_trigger_unregister_simple(struct led_trigger *trigger);
 105 extern void led_trigger_event(struct led_trigger *trigger,
 106                                 enum led_brightness event);
 107
 108 #else
 109
 110 /* Triggers aren't active - null macros */
 111 #define DEFINE_LED_TRIGGER(x)
 112 #define DEFINE_LED_TRIGGER_GLOBAL(x)
 113 #define led_trigger_register_simple(x, y) do {} while(0)
 114 #define led_trigger_unregister_simple(x) do {} while(0)
 115 #define led_trigger_event(x, y) do {} while(0)
 116
 117 #endif
 118
 119 /* Trigger specific functions */
 120 #ifdef CONFIG_LEDS_TRIGGER_IDE_DISK
 121 extern void ledtrig_ide_activity(void);
 122 #else
 123 #define ledtrig_ide_activity() do {} while(0)
 124 #endif
 125
 126 /* For the leds-gpio driver */
 127 struct gpio_led {
 128         const char *name;
 129         char *default_trigger;
 130         unsigned        gpio;
 131         u8              active_low;
 132 };
 133
 134 struct gpio_led_platform_data {
 135         int             num_leds;
 136         struct gpio_led *leds;
 137 };
 138
 139
 140 #endif          /* __LINUX_LEDS_H_INCLUDED */