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 /* 20 * LED Core 21 */ 22 23 enum led_brightness { 24 LED_OFF = 0, 25 LED_HALF = 127, 26 LED_FULL = 255, 27 }; 28 29 struct led_classdev { 30 const char *name; 31 int brightness; 32 int flags; 33 34 #define LED_SUSPENDED (1 << 0) 35 36 /* Set LED brightness level */ 37 void (*brightness_set)(struct led_classdev *led_cdev, 38 enum led_brightness brightness); 39 40 struct device *dev; 41 struct list_head node; /* LED Device list */ 42 char *default_trigger; /* Trigger to use */ 43 44 #ifdef CONFIG_LEDS_TRIGGERS 45 /* Protects the trigger data below */ 46 rwlock_t trigger_lock; 47 48 struct led_trigger *trigger; 49 struct list_head trig_list; 50 void *trigger_data; 51 #endif 52 }; 53 54 extern int led_classdev_register(struct device *parent, 55 struct led_classdev *led_cdev); 56 extern void led_classdev_unregister(struct led_classdev *led_cdev); 57 extern void led_classdev_suspend(struct led_classdev *led_cdev); 58 extern void led_classdev_resume(struct led_classdev *led_cdev); 59 60 /* 61 * LED Triggers 62 */ 63 #ifdef CONFIG_LEDS_TRIGGERS 64 65 #define TRIG_NAME_MAX 50 66 67 struct led_trigger { 68 /* Trigger Properties */ 69 const char *name; 70 void (*activate)(struct led_classdev *led_cdev); 71 void (*deactivate)(struct led_classdev *led_cdev); 72 73 /* LEDs under control by this trigger (for simple triggers) */ 74 rwlock_t leddev_list_lock; 75 struct list_head led_cdevs; 76 77 /* Link to next registered trigger */ 78 struct list_head next_trig; 79 }; 80 81 /* Registration functions for complex triggers */ 82 extern int led_trigger_register(struct led_trigger *trigger); 83 extern void led_trigger_unregister(struct led_trigger *trigger); 84 85 /* Registration functions for simple triggers */ 86 #define DEFINE_LED_TRIGGER(x) static struct led_trigger *x; 87 #define DEFINE_LED_TRIGGER_GLOBAL(x) struct led_trigger *x; 88 extern void led_trigger_register_simple(const char *name, 89 struct led_trigger **trigger); 90 extern void led_trigger_unregister_simple(struct led_trigger *trigger); 91 extern void led_trigger_event(struct led_trigger *trigger, 92 enum led_brightness event); 93 94 #else 95 96 /* Triggers aren't active - null macros */ 97 #define DEFINE_LED_TRIGGER(x) 98 #define DEFINE_LED_TRIGGER_GLOBAL(x) 99 #define led_trigger_register_simple(x, y) do {} while(0) 100 #define led_trigger_unregister_simple(x) do {} while(0) 101 #define led_trigger_event(x, y) do {} while(0) 102 103 #endif 104 105 /* Trigger specific functions */ 106 #ifdef CONFIG_LEDS_TRIGGER_IDE_DISK 107 extern void ledtrig_ide_activity(void); 108 #else 109 #define ledtrig_ide_activity() do {} while(0) 110 #endif 111 112 /* For the leds-gpio driver */ 113 struct gpio_led { 114 const char *name; 115 char *default_trigger; 116 unsigned gpio; 117 u8 active_low; 118 }; 119 120 struct gpio_led_platform_data { 121 int num_leds; 122 struct gpio_led *leds; 123 }; 124 125 126 #endif /* __LINUX_LEDS_H_INCLUDED */ 127