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c72a1d60 RP |
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 | ||
af410fc1 | 15 | #include <linux/list.h> |
df96efd7 | 16 | #include <linux/spinlock.h> |
dc47206e | 17 | #include <linux/rwsem.h> |
5ada28bf | 18 | #include <linux/timer.h> |
af410fc1 | 19 | |
c72a1d60 | 20 | struct device; |
c72a1d60 RP |
21 | /* |
22 | * LED Core | |
23 | */ | |
24 | ||
25 | enum led_brightness { | |
fb5035db BD |
26 | LED_OFF = 0, |
27 | LED_HALF = 127, | |
28 | LED_FULL = 255, | |
c72a1d60 RP |
29 | }; |
30 | ||
31 | struct led_classdev { | |
fb5035db BD |
32 | const char *name; |
33 | int brightness; | |
1bd465e6 | 34 | int max_brightness; |
fb5035db | 35 | int flags; |
c72a1d60 | 36 | |
859cb7f2 | 37 | /* Lower 16 bits reflect status */ |
fb5035db | 38 | #define LED_SUSPENDED (1 << 0) |
859cb7f2 RP |
39 | /* Upper 16 bits reflect control information */ |
40 | #define LED_CORE_SUSPENDRESUME (1 << 16) | |
c72a1d60 | 41 | |
fb5035db | 42 | /* Set LED brightness level */ |
2e214e0f | 43 | /* Must not sleep, use a workqueue if needed */ |
fb5035db BD |
44 | void (*brightness_set)(struct led_classdev *led_cdev, |
45 | enum led_brightness brightness); | |
29d76dfa HMH |
46 | /* Get LED brightness level */ |
47 | enum led_brightness (*brightness_get)(struct led_classdev *led_cdev); | |
fb5035db | 48 | |
5ada28bf JB |
49 | /* |
50 | * Activate hardware accelerated blink, delays are in milliseconds | |
51 | * and if both are zero then a sensible default should be chosen. | |
52 | * The call should adjust the timings in that case and if it can't | |
53 | * match the values specified exactly. | |
54 | * Deactivate blinking again when the brightness is set to a fixed | |
55 | * value via the brightness_set() callback. | |
56 | */ | |
4c79141d MN |
57 | int (*blink_set)(struct led_classdev *led_cdev, |
58 | unsigned long *delay_on, | |
59 | unsigned long *delay_off); | |
60 | ||
f8a7c6fe | 61 | struct device *dev; |
fb5035db | 62 | struct list_head node; /* LED Device list */ |
781a54e7 | 63 | const char *default_trigger; /* Trigger to use */ |
c72a1d60 | 64 | |
5ada28bf JB |
65 | unsigned long blink_delay_on, blink_delay_off; |
66 | struct timer_list blink_timer; | |
67 | int blink_brightness; | |
68 | ||
c3bc9956 | 69 | #ifdef CONFIG_LEDS_TRIGGERS |
c3bc9956 | 70 | /* Protects the trigger data below */ |
dc47206e | 71 | struct rw_semaphore trigger_lock; |
c3bc9956 | 72 | |
fb5035db BD |
73 | struct led_trigger *trigger; |
74 | struct list_head trig_list; | |
75 | void *trigger_data; | |
c3bc9956 | 76 | #endif |
c72a1d60 RP |
77 | }; |
78 | ||
79 | extern int led_classdev_register(struct device *parent, | |
fb5035db | 80 | struct led_classdev *led_cdev); |
e2387d6c | 81 | extern void led_classdev_unregister(struct led_classdev *led_cdev); |
c72a1d60 RP |
82 | extern void led_classdev_suspend(struct led_classdev *led_cdev); |
83 | extern void led_classdev_resume(struct led_classdev *led_cdev); | |
84 | ||
5ada28bf JB |
85 | /** |
86 | * led_blink_set - set blinking with software fallback | |
87 | * @led_cdev: the LED to start blinking | |
88 | * @delay_on: the time it should be on (in ms) | |
89 | * @delay_off: the time it should ble off (in ms) | |
90 | * | |
91 | * This function makes the LED blink, attempting to use the | |
92 | * hardware acceleration if possible, but falling back to | |
93 | * software blinking if there is no hardware blinking or if | |
94 | * the LED refuses the passed values. | |
95 | * | |
96 | * Note that if software blinking is active, simply calling | |
97 | * led_cdev->brightness_set() will not stop the blinking, | |
98 | * use led_classdev_brightness_set() instead. | |
99 | */ | |
100 | extern void led_blink_set(struct led_classdev *led_cdev, | |
101 | unsigned long *delay_on, | |
102 | unsigned long *delay_off); | |
103 | /** | |
104 | * led_brightness_set - set LED brightness | |
105 | * @led_cdev: the LED to set | |
106 | * @brightness: the brightness to set it to | |
107 | * | |
108 | * Set an LED's brightness, and, if necessary, cancel the | |
109 | * software blink timer that implements blinking when the | |
110 | * hardware doesn't. | |
111 | */ | |
112 | extern void led_brightness_set(struct led_classdev *led_cdev, | |
113 | enum led_brightness brightness); | |
114 | ||
c3bc9956 RP |
115 | /* |
116 | * LED Triggers | |
117 | */ | |
118 | #ifdef CONFIG_LEDS_TRIGGERS | |
119 | ||
120 | #define TRIG_NAME_MAX 50 | |
121 | ||
122 | struct led_trigger { | |
123 | /* Trigger Properties */ | |
fb5035db BD |
124 | const char *name; |
125 | void (*activate)(struct led_classdev *led_cdev); | |
126 | void (*deactivate)(struct led_classdev *led_cdev); | |
c3bc9956 RP |
127 | |
128 | /* LEDs under control by this trigger (for simple triggers) */ | |
fb5035db BD |
129 | rwlock_t leddev_list_lock; |
130 | struct list_head led_cdevs; | |
c3bc9956 RP |
131 | |
132 | /* Link to next registered trigger */ | |
fb5035db | 133 | struct list_head next_trig; |
c3bc9956 RP |
134 | }; |
135 | ||
136 | /* Registration functions for complex triggers */ | |
137 | extern int led_trigger_register(struct led_trigger *trigger); | |
138 | extern void led_trigger_unregister(struct led_trigger *trigger); | |
139 | ||
140 | /* Registration functions for simple triggers */ | |
141 | #define DEFINE_LED_TRIGGER(x) static struct led_trigger *x; | |
142 | #define DEFINE_LED_TRIGGER_GLOBAL(x) struct led_trigger *x; | |
143 | extern void led_trigger_register_simple(const char *name, | |
144 | struct led_trigger **trigger); | |
145 | extern void led_trigger_unregister_simple(struct led_trigger *trigger); | |
146 | extern void led_trigger_event(struct led_trigger *trigger, | |
147 | enum led_brightness event); | |
148 | ||
149 | #else | |
150 | ||
151 | /* Triggers aren't active - null macros */ | |
152 | #define DEFINE_LED_TRIGGER(x) | |
153 | #define DEFINE_LED_TRIGGER_GLOBAL(x) | |
154 | #define led_trigger_register_simple(x, y) do {} while(0) | |
155 | #define led_trigger_unregister_simple(x) do {} while(0) | |
156 | #define led_trigger_event(x, y) do {} while(0) | |
157 | ||
158 | #endif | |
2bfb646c RP |
159 | |
160 | /* Trigger specific functions */ | |
161 | #ifdef CONFIG_LEDS_TRIGGER_IDE_DISK | |
162 | extern void ledtrig_ide_activity(void); | |
163 | #else | |
164 | #define ledtrig_ide_activity() do {} while(0) | |
165 | #endif | |
166 | ||
f46e9203 NC |
167 | /* |
168 | * Generic LED platform data for describing LED names and default triggers. | |
169 | */ | |
170 | struct led_info { | |
171 | const char *name; | |
326bb8a5 | 172 | const char *default_trigger; |
f46e9203 NC |
173 | int flags; |
174 | }; | |
175 | ||
176 | struct led_platform_data { | |
177 | int num_leds; | |
178 | struct led_info *leds; | |
179 | }; | |
180 | ||
22e03f3b RA |
181 | /* For the leds-gpio driver */ |
182 | struct gpio_led { | |
183 | const char *name; | |
326bb8a5 | 184 | const char *default_trigger; |
22e03f3b | 185 | unsigned gpio; |
ed88bae6 TP |
186 | unsigned active_low : 1; |
187 | unsigned retain_state_suspended : 1; | |
188 | unsigned default_state : 2; | |
189 | /* default_state should be one of LEDS_GPIO_DEFSTATE_(ON|OFF|KEEP) */ | |
22e03f3b | 190 | }; |
2146325d BH |
191 | #define LEDS_GPIO_DEFSTATE_OFF 0 |
192 | #define LEDS_GPIO_DEFSTATE_ON 1 | |
193 | #define LEDS_GPIO_DEFSTATE_KEEP 2 | |
22e03f3b RA |
194 | |
195 | struct gpio_led_platform_data { | |
196 | int num_leds; | |
197 | struct gpio_led *leds; | |
2146325d BH |
198 | |
199 | #define GPIO_LED_NO_BLINK_LOW 0 /* No blink GPIO state low */ | |
200 | #define GPIO_LED_NO_BLINK_HIGH 1 /* No blink GPIO state high */ | |
201 | #define GPIO_LED_BLINK 2 /* Plase, blink */ | |
202 | int (*gpio_blink_set)(unsigned gpio, int state, | |
ca3259b3 HVR |
203 | unsigned long *delay_on, |
204 | unsigned long *delay_off); | |
22e03f3b RA |
205 | }; |
206 | ||
207 | ||
c72a1d60 | 208 | #endif /* __LINUX_LEDS_H_INCLUDED */ |