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