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 #include <linux/list.h> 16 #include <linux/spinlock.h> 17 18 struct device; 19 struct class_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 struct class_device *class_dev; 42 struct list_head node; /* LED Device list */ 43 char *default_trigger; /* Trigger to use */ 44 45 #ifdef CONFIG_LEDS_TRIGGERS 46 /* Protects the trigger data below */ 47 rwlock_t trigger_lock; 48 49 struct led_trigger *trigger; 50 struct list_head trig_list; 51 void *trigger_data; 52 #endif 53 }; 54 55 extern int led_classdev_register(struct device *parent, 56 struct led_classdev *led_cdev); 57 extern void led_classdev_unregister(struct led_classdev *led_cdev); 58 extern void led_classdev_suspend(struct led_classdev *led_cdev); 59 extern void led_classdev_resume(struct led_classdev *led_cdev); 60 61 /* 62 * LED Triggers 63 */ 64 #ifdef CONFIG_LEDS_TRIGGERS 65 66 #define TRIG_NAME_MAX 50 67 68 struct led_trigger { 69 /* Trigger Properties */ 70 const char *name; 71 void (*activate)(struct led_classdev *led_cdev); 72 void (*deactivate)(struct led_classdev *led_cdev); 73 74 /* LEDs under control by this trigger (for simple triggers) */ 75 rwlock_t leddev_list_lock; 76 struct list_head led_cdevs; 77 78 /* Link to next registered trigger */ 79 struct list_head next_trig; 80 }; 81 82 /* Registration functions for complex triggers */ 83 extern int led_trigger_register(struct led_trigger *trigger); 84 extern void led_trigger_unregister(struct led_trigger *trigger); 85 86 /* Registration functions for simple triggers */ 87 #define DEFINE_LED_TRIGGER(x) static struct led_trigger *x; 88 #define DEFINE_LED_TRIGGER_GLOBAL(x) struct led_trigger *x; 89 extern void led_trigger_register_simple(const char *name, 90 struct led_trigger **trigger); 91 extern void led_trigger_unregister_simple(struct led_trigger *trigger); 92 extern void led_trigger_event(struct led_trigger *trigger, 93 enum led_brightness event); 94 95 #else 96 97 /* Triggers aren't active - null macros */ 98 #define DEFINE_LED_TRIGGER(x) 99 #define DEFINE_LED_TRIGGER_GLOBAL(x) 100 #define led_trigger_register_simple(x, y) do {} while(0) 101 #define led_trigger_unregister_simple(x) do {} while(0) 102 #define led_trigger_event(x, y) do {} while(0) 103 104 #endif 105 106 /* Trigger specific functions */ 107 #ifdef CONFIG_LEDS_TRIGGER_IDE_DISK 108 extern void ledtrig_ide_activity(void); 109 #else 110 #define ledtrig_ide_activity() do {} while(0) 111 #endif 112 113 #endif /* __LINUX_LEDS_H_INCLUDED */ 114