leds.h 2.9 KB

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  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. #include <linux/list.h>
  15. #include <linux/spinlock.h>
  16. struct device;
  17. struct class_device;
  18. /*
  19. * LED Core
  20. */
  21. enum led_brightness {
  22. LED_OFF = 0,
  23. LED_HALF = 127,
  24. LED_FULL = 255,
  25. };
  26. struct led_classdev {
  27. const char *name;
  28. int brightness;
  29. int flags;
  30. #define LED_SUSPENDED (1 << 0)
  31. /* Set LED brightness level */
  32. void (*brightness_set)(struct led_classdev *led_cdev,
  33. enum led_brightness brightness);
  34. struct class_device *class_dev;
  35. struct list_head node; /* LED Device list */
  36. char *default_trigger; /* Trigger to use */
  37. #ifdef CONFIG_LEDS_TRIGGERS
  38. /* Protects the trigger data below */
  39. rwlock_t trigger_lock;
  40. struct led_trigger *trigger;
  41. struct list_head trig_list;
  42. void *trigger_data;
  43. #endif
  44. };
  45. extern int led_classdev_register(struct device *parent,
  46. struct led_classdev *led_cdev);
  47. extern void led_classdev_unregister(struct led_classdev *led_cdev);
  48. extern void led_classdev_suspend(struct led_classdev *led_cdev);
  49. extern void led_classdev_resume(struct led_classdev *led_cdev);
  50. /*
  51. * LED Triggers
  52. */
  53. #ifdef CONFIG_LEDS_TRIGGERS
  54. #define TRIG_NAME_MAX 50
  55. struct led_trigger {
  56. /* Trigger Properties */
  57. const char *name;
  58. void (*activate)(struct led_classdev *led_cdev);
  59. void (*deactivate)(struct led_classdev *led_cdev);
  60. /* LEDs under control by this trigger (for simple triggers) */
  61. rwlock_t leddev_list_lock;
  62. struct list_head led_cdevs;
  63. /* Link to next registered trigger */
  64. struct list_head next_trig;
  65. };
  66. /* Registration functions for complex triggers */
  67. extern int led_trigger_register(struct led_trigger *trigger);
  68. extern void led_trigger_unregister(struct led_trigger *trigger);
  69. /* Registration functions for simple triggers */
  70. #define DEFINE_LED_TRIGGER(x) static struct led_trigger *x;
  71. #define DEFINE_LED_TRIGGER_GLOBAL(x) struct led_trigger *x;
  72. extern void led_trigger_register_simple(const char *name,
  73. struct led_trigger **trigger);
  74. extern void led_trigger_unregister_simple(struct led_trigger *trigger);
  75. extern void led_trigger_event(struct led_trigger *trigger,
  76. enum led_brightness event);
  77. #else
  78. /* Triggers aren't active - null macros */
  79. #define DEFINE_LED_TRIGGER(x)
  80. #define DEFINE_LED_TRIGGER_GLOBAL(x)
  81. #define led_trigger_register_simple(x, y) do {} while(0)
  82. #define led_trigger_unregister_simple(x) do {} while(0)
  83. #define led_trigger_event(x, y) do {} while(0)
  84. #endif
  85. /* Trigger specific functions */
  86. #ifdef CONFIG_LEDS_TRIGGER_IDE_DISK
  87. extern void ledtrig_ide_activity(void);
  88. #else
  89. #define ledtrig_ide_activity() do {} while(0)
  90. #endif
  91. #endif /* __LINUX_LEDS_H_INCLUDED */