Commit | Line | Data |
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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> |
d23a22a7 | 18 | #include <linux/workqueue.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) | |
5bb629c5 FB |
41 | #define LED_BLINK_ONESHOT (1 << 17) |
42 | #define LED_BLINK_ONESHOT_STOP (1 << 18) | |
43 | #define LED_BLINK_INVERT (1 << 19) | |
c72a1d60 | 44 | |
fb5035db | 45 | /* Set LED brightness level */ |
2e214e0f | 46 | /* Must not sleep, use a workqueue if needed */ |
fb5035db BD |
47 | void (*brightness_set)(struct led_classdev *led_cdev, |
48 | enum led_brightness brightness); | |
29d76dfa HMH |
49 | /* Get LED brightness level */ |
50 | enum led_brightness (*brightness_get)(struct led_classdev *led_cdev); | |
fb5035db | 51 | |
5ada28bf JB |
52 | /* |
53 | * Activate hardware accelerated blink, delays are in milliseconds | |
54 | * and if both are zero then a sensible default should be chosen. | |
55 | * The call should adjust the timings in that case and if it can't | |
56 | * match the values specified exactly. | |
57 | * Deactivate blinking again when the brightness is set to a fixed | |
58 | * value via the brightness_set() callback. | |
59 | */ | |
4c79141d MN |
60 | int (*blink_set)(struct led_classdev *led_cdev, |
61 | unsigned long *delay_on, | |
62 | unsigned long *delay_off); | |
63 | ||
f8a7c6fe | 64 | struct device *dev; |
d0d480cc JH |
65 | const struct attribute_group **groups; |
66 | ||
fb5035db | 67 | struct list_head node; /* LED Device list */ |
781a54e7 | 68 | const char *default_trigger; /* Trigger to use */ |
c72a1d60 | 69 | |
5ada28bf | 70 | unsigned long blink_delay_on, blink_delay_off; |
8b37e1be | 71 | struct delayed_work blink_work; |
5ada28bf JB |
72 | int blink_brightness; |
73 | ||
d23a22a7 FB |
74 | struct work_struct set_brightness_work; |
75 | int delayed_set_value; | |
76 | ||
c3bc9956 | 77 | #ifdef CONFIG_LEDS_TRIGGERS |
c3bc9956 | 78 | /* Protects the trigger data below */ |
dc47206e | 79 | struct rw_semaphore trigger_lock; |
c3bc9956 | 80 | |
fb5035db BD |
81 | struct led_trigger *trigger; |
82 | struct list_head trig_list; | |
83 | void *trigger_data; | |
b0096182 SK |
84 | /* true if activated - deactivate routine uses it to do cleanup */ |
85 | bool activated; | |
c3bc9956 | 86 | #endif |
c72a1d60 RP |
87 | }; |
88 | ||
89 | extern int led_classdev_register(struct device *parent, | |
fb5035db | 90 | struct led_classdev *led_cdev); |
e2387d6c | 91 | extern void led_classdev_unregister(struct led_classdev *led_cdev); |
c72a1d60 RP |
92 | extern void led_classdev_suspend(struct led_classdev *led_cdev); |
93 | extern void led_classdev_resume(struct led_classdev *led_cdev); | |
94 | ||
5ada28bf JB |
95 | /** |
96 | * led_blink_set - set blinking with software fallback | |
97 | * @led_cdev: the LED to start blinking | |
98 | * @delay_on: the time it should be on (in ms) | |
99 | * @delay_off: the time it should ble off (in ms) | |
100 | * | |
101 | * This function makes the LED blink, attempting to use the | |
102 | * hardware acceleration if possible, but falling back to | |
103 | * software blinking if there is no hardware blinking or if | |
104 | * the LED refuses the passed values. | |
105 | * | |
106 | * Note that if software blinking is active, simply calling | |
107 | * led_cdev->brightness_set() will not stop the blinking, | |
108 | * use led_classdev_brightness_set() instead. | |
109 | */ | |
110 | extern void led_blink_set(struct led_classdev *led_cdev, | |
111 | unsigned long *delay_on, | |
112 | unsigned long *delay_off); | |
5bb629c5 FB |
113 | /** |
114 | * led_blink_set_oneshot - do a oneshot software blink | |
115 | * @led_cdev: the LED to start blinking | |
116 | * @delay_on: the time it should be on (in ms) | |
117 | * @delay_off: the time it should ble off (in ms) | |
118 | * @invert: blink off, then on, leaving the led on | |
119 | * | |
120 | * This function makes the LED blink one time for delay_on + | |
121 | * delay_off time, ignoring the request if another one-shot | |
122 | * blink is already in progress. | |
123 | * | |
124 | * If invert is set, led blinks for delay_off first, then for | |
125 | * delay_on and leave the led on after the on-off cycle. | |
126 | */ | |
127 | extern void led_blink_set_oneshot(struct led_classdev *led_cdev, | |
128 | unsigned long *delay_on, | |
129 | unsigned long *delay_off, | |
130 | int invert); | |
5ada28bf | 131 | /** |
19cd67e2 | 132 | * led_set_brightness - set LED brightness |
5ada28bf JB |
133 | * @led_cdev: the LED to set |
134 | * @brightness: the brightness to set it to | |
135 | * | |
136 | * Set an LED's brightness, and, if necessary, cancel the | |
137 | * software blink timer that implements blinking when the | |
138 | * hardware doesn't. | |
139 | */ | |
19cd67e2 | 140 | extern void led_set_brightness(struct led_classdev *led_cdev, |
5ada28bf JB |
141 | enum led_brightness brightness); |
142 | ||
c3bc9956 RP |
143 | /* |
144 | * LED Triggers | |
145 | */ | |
39f7e08a KM |
146 | /* Registration functions for simple triggers */ |
147 | #define DEFINE_LED_TRIGGER(x) static struct led_trigger *x; | |
148 | #define DEFINE_LED_TRIGGER_GLOBAL(x) struct led_trigger *x; | |
149 | ||
c3bc9956 RP |
150 | #ifdef CONFIG_LEDS_TRIGGERS |
151 | ||
152 | #define TRIG_NAME_MAX 50 | |
153 | ||
154 | struct led_trigger { | |
155 | /* Trigger Properties */ | |
fb5035db BD |
156 | const char *name; |
157 | void (*activate)(struct led_classdev *led_cdev); | |
158 | void (*deactivate)(struct led_classdev *led_cdev); | |
c3bc9956 RP |
159 | |
160 | /* LEDs under control by this trigger (for simple triggers) */ | |
fb5035db BD |
161 | rwlock_t leddev_list_lock; |
162 | struct list_head led_cdevs; | |
c3bc9956 RP |
163 | |
164 | /* Link to next registered trigger */ | |
fb5035db | 165 | struct list_head next_trig; |
c3bc9956 RP |
166 | }; |
167 | ||
168 | /* Registration functions for complex triggers */ | |
169 | extern int led_trigger_register(struct led_trigger *trigger); | |
170 | extern void led_trigger_unregister(struct led_trigger *trigger); | |
171 | ||
c3bc9956 RP |
172 | extern void led_trigger_register_simple(const char *name, |
173 | struct led_trigger **trigger); | |
174 | extern void led_trigger_unregister_simple(struct led_trigger *trigger); | |
175 | extern void led_trigger_event(struct led_trigger *trigger, | |
176 | enum led_brightness event); | |
0b9536c9 VK |
177 | extern void led_trigger_blink(struct led_trigger *trigger, |
178 | unsigned long *delay_on, | |
179 | unsigned long *delay_off); | |
5bb629c5 FB |
180 | extern void led_trigger_blink_oneshot(struct led_trigger *trigger, |
181 | unsigned long *delay_on, | |
182 | unsigned long *delay_off, | |
183 | int invert); | |
057407c7 JH |
184 | /** |
185 | * led_trigger_rename_static - rename a trigger | |
186 | * @name: the new trigger name | |
187 | * @trig: the LED trigger to rename | |
188 | * | |
189 | * Change a LED trigger name by copying the string passed in | |
190 | * name into current trigger name, which MUST be large | |
191 | * enough for the new string. | |
192 | * | |
193 | * Note that name must NOT point to the same string used | |
194 | * during LED registration, as that could lead to races. | |
195 | * | |
196 | * This is meant to be used on triggers with statically | |
197 | * allocated name. | |
198 | */ | |
199 | extern void led_trigger_rename_static(const char *name, | |
200 | struct led_trigger *trig); | |
c3bc9956 RP |
201 | |
202 | #else | |
203 | ||
39f7e08a KM |
204 | /* Trigger has no members */ |
205 | struct led_trigger {}; | |
c3bc9956 | 206 | |
39f7e08a KM |
207 | /* Trigger inline empty functions */ |
208 | static inline void led_trigger_register_simple(const char *name, | |
209 | struct led_trigger **trigger) {} | |
210 | static inline void led_trigger_unregister_simple(struct led_trigger *trigger) {} | |
211 | static inline void led_trigger_event(struct led_trigger *trigger, | |
212 | enum led_brightness event) {} | |
213 | #endif /* CONFIG_LEDS_TRIGGERS */ | |
2bfb646c RP |
214 | |
215 | /* Trigger specific functions */ | |
216 | #ifdef CONFIG_LEDS_TRIGGER_IDE_DISK | |
217 | extern void ledtrig_ide_activity(void); | |
218 | #else | |
39f7e08a | 219 | static inline void ledtrig_ide_activity(void) {} |
2bfb646c RP |
220 | #endif |
221 | ||
48a1d032 KM |
222 | #if defined(CONFIG_LEDS_TRIGGER_CAMERA) || defined(CONFIG_LEDS_TRIGGER_CAMERA_MODULE) |
223 | extern void ledtrig_flash_ctrl(bool on); | |
224 | extern void ledtrig_torch_ctrl(bool on); | |
225 | #else | |
226 | static inline void ledtrig_flash_ctrl(bool on) {} | |
227 | static inline void ledtrig_torch_ctrl(bool on) {} | |
228 | #endif | |
229 | ||
f46e9203 NC |
230 | /* |
231 | * Generic LED platform data for describing LED names and default triggers. | |
232 | */ | |
233 | struct led_info { | |
234 | const char *name; | |
326bb8a5 | 235 | const char *default_trigger; |
f46e9203 NC |
236 | int flags; |
237 | }; | |
238 | ||
239 | struct led_platform_data { | |
240 | int num_leds; | |
241 | struct led_info *leds; | |
242 | }; | |
243 | ||
22e03f3b RA |
244 | /* For the leds-gpio driver */ |
245 | struct gpio_led { | |
246 | const char *name; | |
326bb8a5 | 247 | const char *default_trigger; |
22e03f3b | 248 | unsigned gpio; |
ed88bae6 TP |
249 | unsigned active_low : 1; |
250 | unsigned retain_state_suspended : 1; | |
251 | unsigned default_state : 2; | |
252 | /* default_state should be one of LEDS_GPIO_DEFSTATE_(ON|OFF|KEEP) */ | |
22e03f3b | 253 | }; |
2146325d BH |
254 | #define LEDS_GPIO_DEFSTATE_OFF 0 |
255 | #define LEDS_GPIO_DEFSTATE_ON 1 | |
256 | #define LEDS_GPIO_DEFSTATE_KEEP 2 | |
22e03f3b RA |
257 | |
258 | struct gpio_led_platform_data { | |
259 | int num_leds; | |
9517f925 | 260 | const struct gpio_led *leds; |
2146325d BH |
261 | |
262 | #define GPIO_LED_NO_BLINK_LOW 0 /* No blink GPIO state low */ | |
263 | #define GPIO_LED_NO_BLINK_HIGH 1 /* No blink GPIO state high */ | |
9517f925 | 264 | #define GPIO_LED_BLINK 2 /* Please, blink */ |
2146325d | 265 | int (*gpio_blink_set)(unsigned gpio, int state, |
ca3259b3 HVR |
266 | unsigned long *delay_on, |
267 | unsigned long *delay_off); | |
22e03f3b RA |
268 | }; |
269 | ||
4440673a UKK |
270 | struct platform_device *gpio_led_register_device( |
271 | int id, const struct gpio_led_platform_data *pdata); | |
22e03f3b | 272 | |
8f88731d BW |
273 | enum cpu_led_event { |
274 | CPU_LED_IDLE_START, /* CPU enters idle */ | |
275 | CPU_LED_IDLE_END, /* CPU idle ends */ | |
276 | CPU_LED_START, /* Machine starts, especially resume */ | |
277 | CPU_LED_STOP, /* Machine stops, especially suspend */ | |
278 | CPU_LED_HALTED, /* Machine shutdown */ | |
279 | }; | |
280 | #ifdef CONFIG_LEDS_TRIGGER_CPU | |
281 | extern void ledtrig_cpu(enum cpu_led_event evt); | |
282 | #else | |
283 | static inline void ledtrig_cpu(enum cpu_led_event evt) | |
284 | { | |
285 | return; | |
286 | } | |
287 | #endif | |
288 | ||
c72a1d60 | 289 | #endif /* __LINUX_LEDS_H_INCLUDED */ |