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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 | |
15 | #include <linux/list.h> |
16 | #include <linux/spinlock.h> |
17 | #include <linux/rwsem.h> |
18 | |
19 | struct 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 max_brightness; |
34 | int flags; |
35 | |
36 | /* Lower 16 bits reflect status */ |
37 | #define LED_SUSPENDED (1 << 0) |
38 | /* Upper 16 bits reflect control information */ |
39 | #define LED_CORE_SUSPENDRESUME (1 << 16) |
40 | |
41 | /* Set LED brightness level */ |
42 | /* Must not sleep, use a workqueue if needed */ |
43 | void (*brightness_set)(struct led_classdev *led_cdev, |
44 | enum led_brightness brightness); |
45 | /* Get LED brightness level */ |
46 | enum led_brightness (*brightness_get)(struct led_classdev *led_cdev); |
47 | |
48 | /* Activate hardware accelerated blink, delays are in |
49 | * miliseconds and if none is provided then a sensible default |
50 | * should be chosen. The call can adjust the timings if it can't |
51 | * match the values specified exactly. */ |
52 | int (*blink_set)(struct led_classdev *led_cdev, |
53 | unsigned long *delay_on, |
54 | unsigned long *delay_off); |
55 | |
56 | struct device *dev; |
57 | struct list_head node; /* LED Device list */ |
58 | const char *default_trigger; /* Trigger to use */ |
59 | |
60 | #ifdef CONFIG_LEDS_TRIGGERS |
61 | /* Protects the trigger data below */ |
62 | struct rw_semaphore trigger_lock; |
63 | |
64 | struct led_trigger *trigger; |
65 | struct list_head trig_list; |
66 | void *trigger_data; |
67 | #endif |
68 | }; |
69 | |
70 | extern int led_classdev_register(struct device *parent, |
71 | struct led_classdev *led_cdev); |
72 | extern void led_classdev_unregister(struct led_classdev *led_cdev); |
73 | extern void led_classdev_suspend(struct led_classdev *led_cdev); |
74 | extern void led_classdev_resume(struct led_classdev *led_cdev); |
75 | |
76 | /* |
77 | * LED Triggers |
78 | */ |
79 | #ifdef CONFIG_LEDS_TRIGGERS |
80 | |
81 | #define TRIG_NAME_MAX 50 |
82 | |
83 | struct led_trigger { |
84 | /* Trigger Properties */ |
85 | const char *name; |
86 | void (*activate)(struct led_classdev *led_cdev); |
87 | void (*deactivate)(struct led_classdev *led_cdev); |
88 | |
89 | /* LEDs under control by this trigger (for simple triggers) */ |
90 | rwlock_t leddev_list_lock; |
91 | struct list_head led_cdevs; |
92 | |
93 | /* Link to next registered trigger */ |
94 | struct list_head next_trig; |
95 | }; |
96 | |
97 | /* Registration functions for complex triggers */ |
98 | extern int led_trigger_register(struct led_trigger *trigger); |
99 | extern void led_trigger_unregister(struct led_trigger *trigger); |
100 | |
101 | /* Registration functions for simple triggers */ |
102 | #define DEFINE_LED_TRIGGER(x) static struct led_trigger *x; |
103 | #define DEFINE_LED_TRIGGER_GLOBAL(x) struct led_trigger *x; |
104 | extern void led_trigger_register_simple(const char *name, |
105 | struct led_trigger **trigger); |
106 | extern void led_trigger_unregister_simple(struct led_trigger *trigger); |
107 | extern void led_trigger_event(struct led_trigger *trigger, |
108 | enum led_brightness event); |
109 | |
110 | #else |
111 | |
112 | /* Triggers aren't active - null macros */ |
113 | #define DEFINE_LED_TRIGGER(x) |
114 | #define DEFINE_LED_TRIGGER_GLOBAL(x) |
115 | #define led_trigger_register_simple(x, y) do {} while(0) |
116 | #define led_trigger_unregister_simple(x) do {} while(0) |
117 | #define led_trigger_event(x, y) do {} while(0) |
118 | |
119 | #endif |
120 | |
121 | /* Trigger specific functions */ |
122 | #ifdef CONFIG_LEDS_TRIGGER_IDE_DISK |
123 | extern void ledtrig_ide_activity(void); |
124 | #else |
125 | #define ledtrig_ide_activity() do {} while(0) |
126 | #endif |
127 | |
128 | /* |
129 | * Generic LED platform data for describing LED names and default triggers. |
130 | */ |
131 | struct led_info { |
132 | const char *name; |
133 | const char *default_trigger; |
134 | int flags; |
135 | }; |
136 | |
137 | struct led_platform_data { |
138 | int num_leds; |
139 | struct led_info *leds; |
140 | }; |
141 | |
142 | /* For the leds-gpio driver */ |
143 | struct gpio_led { |
144 | const char *name; |
145 | const char *default_trigger; |
146 | unsigned gpio; |
147 | unsigned active_low : 1; |
148 | unsigned retain_state_suspended : 1; |
149 | unsigned default_state : 2; |
150 | /* default_state should be one of LEDS_GPIO_DEFSTATE_(ON|OFF|KEEP) */ |
151 | }; |
152 | #define LEDS_GPIO_DEFSTATE_OFF 0 |
153 | #define LEDS_GPIO_DEFSTATE_ON 1 |
154 | #define LEDS_GPIO_DEFSTATE_KEEP 2 |
155 | |
156 | struct gpio_led_platform_data { |
157 | int num_leds; |
158 | struct gpio_led *leds; |
159 | int (*gpio_blink_set)(unsigned gpio, |
160 | unsigned long *delay_on, |
161 | unsigned long *delay_off); |
162 | }; |
163 | |
164 | |
165 | #endif /* __LINUX_LEDS_H_INCLUDED */ |
166 |
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