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                      max_brightness;
  34         int                      flags;
  35
  36         /* Lower 16 bits reflect status */
  37 #define LED_SUSPENDED           (1 << 0)
  38         /* Upper 16 bits reflect control information */
  39 #define LED_CORE_SUSPENDRESUME  (1 << 16)
  40
  41         /* Set LED brightness level */
  42         /* Must not sleep, use a workqueue if needed */
  43         void            (*brightness_set)(struct led_classdev *led_cdev,
  44                                           enum led_brightness brightness);
  45         /* Get LED brightness level */
  46         enum led_brightness (*brightness_get)(struct led_classdev *led_cdev);
  47
  48         /* Activate hardware accelerated blink */
  49         int             (*blink_set)(struct led_classdev *led_cdev,
  50                                      unsigned long *delay_on,
  51                                      unsigned long *delay_off);
  52
  53         struct device           *dev;
  54         struct list_head         node;                  /* LED Device list */
  55         const char              *default_trigger;       /* Trigger to use */
  56
  57 #ifdef CONFIG_LEDS_TRIGGERS
  58         /* Protects the trigger data below */
  59         struct rw_semaphore      trigger_lock;
  60
  61         struct led_trigger      *trigger;
  62         struct list_head         trig_list;
  63         void                    *trigger_data;
  64 #endif
  65 };
  66
  67 extern int led_classdev_register(struct device *parent,
  68                                  struct led_classdev *led_cdev);
  69 extern void led_classdev_unregister(struct led_classdev *led_cdev);
  70 extern void led_classdev_suspend(struct led_classdev *led_cdev);
  71 extern void led_classdev_resume(struct led_classdev *led_cdev);
  72
  73 /*
  74  * LED Triggers
  75  */
  76 #ifdef CONFIG_LEDS_TRIGGERS
  77
  78 #define TRIG_NAME_MAX 50
  79
  80 struct led_trigger {
  81         /* Trigger Properties */
  82         const char       *name;
  83         void            (*activate)(struct led_classdev *led_cdev);
  84         void            (*deactivate)(struct led_classdev *led_cdev);
  85
  86         /* LEDs under control by this trigger (for simple triggers) */
  87         rwlock_t          leddev_list_lock;
  88         struct list_head  led_cdevs;
  89
  90         /* Link to next registered trigger */
  91         struct list_head  next_trig;
  92 };
  93
  94 /* Registration functions for complex triggers */
  95 extern int led_trigger_register(struct led_trigger *trigger);
  96 extern void led_trigger_unregister(struct led_trigger *trigger);
  97
  98 /* Registration functions for simple triggers */
  99 #define DEFINE_LED_TRIGGER(x)           static struct led_trigger *x;
 100 #define DEFINE_LED_TRIGGER_GLOBAL(x)    struct led_trigger *x;
 101 extern void led_trigger_register_simple(const char *name,
 102                                 struct led_trigger **trigger);
 103 extern void led_trigger_unregister_simple(struct led_trigger *trigger);
 104 extern void led_trigger_event(struct led_trigger *trigger,
 105                                 enum led_brightness event);
 106
 107 #else
 108
 109 /* Triggers aren't active - null macros */
 110 #define DEFINE_LED_TRIGGER(x)
 111 #define DEFINE_LED_TRIGGER_GLOBAL(x)
 112 #define led_trigger_register_simple(x, y) do {} while(0)
 113 #define led_trigger_unregister_simple(x) do {} while(0)
 114 #define led_trigger_event(x, y) do {} while(0)
 115
 116 #endif
 117
 118 /* Trigger specific functions */
 119 #ifdef CONFIG_LEDS_TRIGGER_IDE_DISK
 120 extern void ledtrig_ide_activity(void);
 121 #else
 122 #define ledtrig_ide_activity() do {} while(0)
 123 #endif
 124
 125 /*
 126  * Generic LED platform data for describing LED names and default triggers.
 127  */
 128 struct led_info {
 129         const char      *name;
 130         const char      *default_trigger;
 131         int             flags;
 132 };
 133
 134 struct led_platform_data {
 135         int             num_leds;
 136         struct led_info *leds;
 137 };
 138
 139 /* For the leds-gpio driver */
 140 struct gpio_led {
 141         const char *name;
 142         const char *default_trigger;
 143         unsigned        gpio;
 144         u8              active_low : 1;
 145         u8              retain_state_suspended : 1;
 146 };
 147
 148 struct gpio_led_platform_data {
 149         int             num_leds;
 150         struct gpio_led *leds;
 151         int             (*gpio_blink_set)(unsigned gpio,
 152                                         unsigned long *delay_on,
 153                                         unsigned long *delay_off);
 154 };
 155
 156
 157 #endif          /* __LINUX_LEDS_H_INCLUDED */