1 /* 2 * Driver model for leds and led triggers 3 * 4 * Copyright (C) 2005 John Lenz <[email protected]> 5 * Copyright (C) 2005 Richard Purdie <[email protected]> 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 */ 111