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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 | ||
20f56758 | 15 | #include <linux/device.h> |
0cb8eb30 | 16 | #include <linux/kernfs.h> |
af410fc1 | 17 | #include <linux/list.h> |
acd899e4 | 18 | #include <linux/mutex.h> |
dc47206e | 19 | #include <linux/rwsem.h> |
04713306 | 20 | #include <linux/spinlock.h> |
9067359f | 21 | #include <linux/timer.h> |
d23a22a7 | 22 | #include <linux/workqueue.h> |
af410fc1 | 23 | |
c72a1d60 | 24 | struct device; |
c72a1d60 RP |
25 | /* |
26 | * LED Core | |
27 | */ | |
28 | ||
29 | enum led_brightness { | |
fb5035db | 30 | LED_OFF = 0, |
4e552c8c | 31 | LED_ON = 1, |
fb5035db BD |
32 | LED_HALF = 127, |
33 | LED_FULL = 255, | |
c72a1d60 RP |
34 | }; |
35 | ||
36 | struct led_classdev { | |
fb5035db | 37 | const char *name; |
d8082827 JA |
38 | enum led_brightness brightness; |
39 | enum led_brightness max_brightness; | |
fb5035db | 40 | int flags; |
c72a1d60 | 41 | |
859cb7f2 | 42 | /* Lower 16 bits reflect status */ |
55edd1da DL |
43 | #define LED_SUSPENDED BIT(0) |
44 | #define LED_UNREGISTERING BIT(1) | |
859cb7f2 | 45 | /* Upper 16 bits reflect control information */ |
55edd1da DL |
46 | #define LED_CORE_SUSPENDRESUME BIT(16) |
47 | #define LED_SYSFS_DISABLE BIT(17) | |
48 | #define LED_DEV_CAP_FLASH BIT(18) | |
49 | #define LED_HW_PLUGGABLE BIT(19) | |
50 | #define LED_PANIC_INDICATOR BIT(20) | |
51 | #define LED_BRIGHT_HW_CHANGED BIT(21) | |
52 | #define LED_RETAIN_AT_SHUTDOWN BIT(22) | |
a9c6ce57 HG |
53 | |
54 | /* set_brightness_work / blink_timer flags, atomic, private. */ | |
55 | unsigned long work_flags; | |
56 | ||
57 | #define LED_BLINK_SW 0 | |
58 | #define LED_BLINK_ONESHOT 1 | |
59 | #define LED_BLINK_ONESHOT_STOP 2 | |
60 | #define LED_BLINK_INVERT 3 | |
61 | #define LED_BLINK_BRIGHTNESS_CHANGE 4 | |
62 | #define LED_BLINK_DISABLE 5 | |
c72a1d60 | 63 | |
70b2563b HK |
64 | /* Set LED brightness level |
65 | * Must not sleep. Use brightness_set_blocking for drivers | |
66 | * that can sleep while setting brightness. | |
67 | */ | |
fb5035db BD |
68 | void (*brightness_set)(struct led_classdev *led_cdev, |
69 | enum led_brightness brightness); | |
4d71a4a1 JA |
70 | /* |
71 | * Set LED brightness level immediately - it can block the caller for | |
72 | * the time required for accessing a LED device register. | |
73 | */ | |
437a4240 JA |
74 | int (*brightness_set_blocking)(struct led_classdev *led_cdev, |
75 | enum led_brightness brightness); | |
29d76dfa HMH |
76 | /* Get LED brightness level */ |
77 | enum led_brightness (*brightness_get)(struct led_classdev *led_cdev); | |
fb5035db | 78 | |
5ada28bf JB |
79 | /* |
80 | * Activate hardware accelerated blink, delays are in milliseconds | |
81 | * and if both are zero then a sensible default should be chosen. | |
82 | * The call should adjust the timings in that case and if it can't | |
83 | * match the values specified exactly. | |
7cfe749f TM |
84 | * Deactivate blinking again when the brightness is set to LED_OFF |
85 | * via the brightness_set() callback. | |
5ada28bf | 86 | */ |
4c79141d MN |
87 | int (*blink_set)(struct led_classdev *led_cdev, |
88 | unsigned long *delay_on, | |
89 | unsigned long *delay_off); | |
90 | ||
f8a7c6fe | 91 | struct device *dev; |
d0d480cc JH |
92 | const struct attribute_group **groups; |
93 | ||
fb5035db | 94 | struct list_head node; /* LED Device list */ |
781a54e7 | 95 | const char *default_trigger; /* Trigger to use */ |
c72a1d60 | 96 | |
5ada28bf | 97 | unsigned long blink_delay_on, blink_delay_off; |
9067359f | 98 | struct timer_list blink_timer; |
5ada28bf | 99 | int blink_brightness; |
eb1610b4 | 100 | int new_blink_brightness; |
7aea8389 | 101 | void (*flash_resume)(struct led_classdev *led_cdev); |
5ada28bf | 102 | |
d23a22a7 FB |
103 | struct work_struct set_brightness_work; |
104 | int delayed_set_value; | |
105 | ||
c3bc9956 | 106 | #ifdef CONFIG_LEDS_TRIGGERS |
c3bc9956 | 107 | /* Protects the trigger data below */ |
dc47206e | 108 | struct rw_semaphore trigger_lock; |
c3bc9956 | 109 | |
fb5035db BD |
110 | struct led_trigger *trigger; |
111 | struct list_head trig_list; | |
112 | void *trigger_data; | |
b0096182 SK |
113 | /* true if activated - deactivate routine uses it to do cleanup */ |
114 | bool activated; | |
c3bc9956 | 115 | #endif |
acd899e4 | 116 | |
0cb8eb30 HG |
117 | #ifdef CONFIG_LEDS_BRIGHTNESS_HW_CHANGED |
118 | int brightness_hw_changed; | |
119 | struct kernfs_node *brightness_hw_changed_kn; | |
120 | #endif | |
121 | ||
acd899e4 JA |
122 | /* Ensures consistent access to the LED Flash Class device */ |
123 | struct mutex led_access; | |
c72a1d60 RP |
124 | }; |
125 | ||
442c6098 RM |
126 | extern int of_led_classdev_register(struct device *parent, |
127 | struct device_node *np, | |
128 | struct led_classdev *led_cdev); | |
129 | #define led_classdev_register(parent, led_cdev) \ | |
130 | of_led_classdev_register(parent, NULL, led_cdev) | |
131 | extern int devm_of_led_classdev_register(struct device *parent, | |
132 | struct device_node *np, | |
133 | struct led_classdev *led_cdev); | |
134 | #define devm_led_classdev_register(parent, led_cdev) \ | |
135 | devm_of_led_classdev_register(parent, NULL, led_cdev) | |
e2387d6c | 136 | extern void led_classdev_unregister(struct led_classdev *led_cdev); |
ca1bb4ee BA |
137 | extern void devm_led_classdev_unregister(struct device *parent, |
138 | struct led_classdev *led_cdev); | |
c72a1d60 RP |
139 | extern void led_classdev_suspend(struct led_classdev *led_cdev); |
140 | extern void led_classdev_resume(struct led_classdev *led_cdev); | |
141 | ||
5ada28bf JB |
142 | /** |
143 | * led_blink_set - set blinking with software fallback | |
144 | * @led_cdev: the LED to start blinking | |
145 | * @delay_on: the time it should be on (in ms) | |
146 | * @delay_off: the time it should ble off (in ms) | |
147 | * | |
148 | * This function makes the LED blink, attempting to use the | |
149 | * hardware acceleration if possible, but falling back to | |
150 | * software blinking if there is no hardware blinking or if | |
151 | * the LED refuses the passed values. | |
152 | * | |
153 | * Note that if software blinking is active, simply calling | |
154 | * led_cdev->brightness_set() will not stop the blinking, | |
155 | * use led_classdev_brightness_set() instead. | |
156 | */ | |
157 | extern void led_blink_set(struct led_classdev *led_cdev, | |
158 | unsigned long *delay_on, | |
159 | unsigned long *delay_off); | |
5bb629c5 FB |
160 | /** |
161 | * led_blink_set_oneshot - do a oneshot software blink | |
162 | * @led_cdev: the LED to start blinking | |
163 | * @delay_on: the time it should be on (in ms) | |
164 | * @delay_off: the time it should ble off (in ms) | |
165 | * @invert: blink off, then on, leaving the led on | |
166 | * | |
167 | * This function makes the LED blink one time for delay_on + | |
168 | * delay_off time, ignoring the request if another one-shot | |
169 | * blink is already in progress. | |
170 | * | |
171 | * If invert is set, led blinks for delay_off first, then for | |
172 | * delay_on and leave the led on after the on-off cycle. | |
173 | */ | |
174 | extern void led_blink_set_oneshot(struct led_classdev *led_cdev, | |
175 | unsigned long *delay_on, | |
176 | unsigned long *delay_off, | |
177 | int invert); | |
5ada28bf | 178 | /** |
19cd67e2 | 179 | * led_set_brightness - set LED brightness |
5ada28bf JB |
180 | * @led_cdev: the LED to set |
181 | * @brightness: the brightness to set it to | |
182 | * | |
183 | * Set an LED's brightness, and, if necessary, cancel the | |
184 | * software blink timer that implements blinking when the | |
1afcadfc | 185 | * hardware doesn't. This function is guaranteed not to sleep. |
5ada28bf | 186 | */ |
19cd67e2 | 187 | extern void led_set_brightness(struct led_classdev *led_cdev, |
5ada28bf | 188 | enum led_brightness brightness); |
13ae79bb JA |
189 | |
190 | /** | |
191 | * led_set_brightness_sync - set LED brightness synchronously | |
192 | * @led_cdev: the LED to set | |
193 | * @brightness: the brightness to set it to | |
194 | * | |
195 | * Set an LED's brightness immediately. This function will block | |
196 | * the caller for the time required for accessing device registers, | |
197 | * and it can sleep. | |
198 | * | |
199 | * Returns: 0 on success or negative error value on failure | |
200 | */ | |
201 | extern int led_set_brightness_sync(struct led_classdev *led_cdev, | |
202 | enum led_brightness value); | |
203 | ||
3ef7de53 JA |
204 | /** |
205 | * led_update_brightness - update LED brightness | |
206 | * @led_cdev: the LED to query | |
207 | * | |
208 | * Get an LED's current brightness and update led_cdev->brightness | |
209 | * member with the obtained value. | |
210 | * | |
211 | * Returns: 0 on success or negative error value on failure | |
212 | */ | |
213 | extern int led_update_brightness(struct led_classdev *led_cdev); | |
5ada28bf | 214 | |
acd899e4 JA |
215 | /** |
216 | * led_sysfs_disable - disable LED sysfs interface | |
217 | * @led_cdev: the LED to set | |
218 | * | |
219 | * Disable the led_cdev's sysfs interface. | |
220 | */ | |
221 | extern void led_sysfs_disable(struct led_classdev *led_cdev); | |
222 | ||
223 | /** | |
224 | * led_sysfs_enable - enable LED sysfs interface | |
225 | * @led_cdev: the LED to set | |
226 | * | |
227 | * Enable the led_cdev's sysfs interface. | |
228 | */ | |
229 | extern void led_sysfs_enable(struct led_classdev *led_cdev); | |
230 | ||
231 | /** | |
232 | * led_sysfs_is_disabled - check if LED sysfs interface is disabled | |
233 | * @led_cdev: the LED to query | |
234 | * | |
235 | * Returns: true if the led_cdev's sysfs interface is disabled. | |
236 | */ | |
237 | static inline bool led_sysfs_is_disabled(struct led_classdev *led_cdev) | |
238 | { | |
239 | return led_cdev->flags & LED_SYSFS_DISABLE; | |
240 | } | |
241 | ||
c3bc9956 RP |
242 | /* |
243 | * LED Triggers | |
244 | */ | |
39f7e08a KM |
245 | /* Registration functions for simple triggers */ |
246 | #define DEFINE_LED_TRIGGER(x) static struct led_trigger *x; | |
247 | #define DEFINE_LED_TRIGGER_GLOBAL(x) struct led_trigger *x; | |
248 | ||
c3bc9956 RP |
249 | #ifdef CONFIG_LEDS_TRIGGERS |
250 | ||
251 | #define TRIG_NAME_MAX 50 | |
252 | ||
253 | struct led_trigger { | |
254 | /* Trigger Properties */ | |
fb5035db BD |
255 | const char *name; |
256 | void (*activate)(struct led_classdev *led_cdev); | |
257 | void (*deactivate)(struct led_classdev *led_cdev); | |
c3bc9956 RP |
258 | |
259 | /* LEDs under control by this trigger (for simple triggers) */ | |
fb5035db BD |
260 | rwlock_t leddev_list_lock; |
261 | struct list_head led_cdevs; | |
c3bc9956 RP |
262 | |
263 | /* Link to next registered trigger */ | |
fb5035db | 264 | struct list_head next_trig; |
c3bc9956 RP |
265 | }; |
266 | ||
20f56758 JA |
267 | ssize_t led_trigger_store(struct device *dev, struct device_attribute *attr, |
268 | const char *buf, size_t count); | |
269 | ssize_t led_trigger_show(struct device *dev, struct device_attribute *attr, | |
270 | char *buf); | |
271 | ||
c3bc9956 RP |
272 | /* Registration functions for complex triggers */ |
273 | extern int led_trigger_register(struct led_trigger *trigger); | |
274 | extern void led_trigger_unregister(struct led_trigger *trigger); | |
9534cc31 HK |
275 | extern int devm_led_trigger_register(struct device *dev, |
276 | struct led_trigger *trigger); | |
c3bc9956 | 277 | |
c3bc9956 RP |
278 | extern void led_trigger_register_simple(const char *name, |
279 | struct led_trigger **trigger); | |
280 | extern void led_trigger_unregister_simple(struct led_trigger *trigger); | |
281 | extern void led_trigger_event(struct led_trigger *trigger, | |
282 | enum led_brightness event); | |
0b9536c9 VK |
283 | extern void led_trigger_blink(struct led_trigger *trigger, |
284 | unsigned long *delay_on, | |
285 | unsigned long *delay_off); | |
5bb629c5 FB |
286 | extern void led_trigger_blink_oneshot(struct led_trigger *trigger, |
287 | unsigned long *delay_on, | |
288 | unsigned long *delay_off, | |
289 | int invert); | |
20f56758 JA |
290 | extern void led_trigger_set_default(struct led_classdev *led_cdev); |
291 | extern void led_trigger_set(struct led_classdev *led_cdev, | |
292 | struct led_trigger *trigger); | |
293 | extern void led_trigger_remove(struct led_classdev *led_cdev); | |
294 | ||
295 | static inline void *led_get_trigger_data(struct led_classdev *led_cdev) | |
296 | { | |
297 | return led_cdev->trigger_data; | |
298 | } | |
299 | ||
057407c7 JH |
300 | /** |
301 | * led_trigger_rename_static - rename a trigger | |
302 | * @name: the new trigger name | |
303 | * @trig: the LED trigger to rename | |
304 | * | |
305 | * Change a LED trigger name by copying the string passed in | |
306 | * name into current trigger name, which MUST be large | |
307 | * enough for the new string. | |
308 | * | |
309 | * Note that name must NOT point to the same string used | |
310 | * during LED registration, as that could lead to races. | |
311 | * | |
312 | * This is meant to be used on triggers with statically | |
313 | * allocated name. | |
314 | */ | |
315 | extern void led_trigger_rename_static(const char *name, | |
316 | struct led_trigger *trig); | |
c3bc9956 RP |
317 | |
318 | #else | |
319 | ||
39f7e08a KM |
320 | /* Trigger has no members */ |
321 | struct led_trigger {}; | |
c3bc9956 | 322 | |
39f7e08a KM |
323 | /* Trigger inline empty functions */ |
324 | static inline void led_trigger_register_simple(const char *name, | |
325 | struct led_trigger **trigger) {} | |
326 | static inline void led_trigger_unregister_simple(struct led_trigger *trigger) {} | |
327 | static inline void led_trigger_event(struct led_trigger *trigger, | |
328 | enum led_brightness event) {} | |
8890624a MG |
329 | static inline void led_trigger_blink(struct led_trigger *trigger, |
330 | unsigned long *delay_on, | |
331 | unsigned long *delay_off) {} | |
332 | static inline void led_trigger_blink_oneshot(struct led_trigger *trigger, | |
333 | unsigned long *delay_on, | |
334 | unsigned long *delay_off, | |
335 | int invert) {} | |
20f56758 JA |
336 | static inline void led_trigger_set_default(struct led_classdev *led_cdev) {} |
337 | static inline void led_trigger_set(struct led_classdev *led_cdev, | |
338 | struct led_trigger *trigger) {} | |
339 | static inline void led_trigger_remove(struct led_classdev *led_cdev) {} | |
340 | static inline void *led_get_trigger_data(struct led_classdev *led_cdev) | |
341 | { | |
342 | return NULL; | |
343 | } | |
344 | ||
39f7e08a | 345 | #endif /* CONFIG_LEDS_TRIGGERS */ |
2bfb646c RP |
346 | |
347 | /* Trigger specific functions */ | |
eb25cb99 SL |
348 | #ifdef CONFIG_LEDS_TRIGGER_DISK |
349 | extern void ledtrig_disk_activity(void); | |
2bfb646c | 350 | #else |
eb25cb99 | 351 | static inline void ledtrig_disk_activity(void) {} |
2bfb646c RP |
352 | #endif |
353 | ||
4b721174 EG |
354 | #ifdef CONFIG_LEDS_TRIGGER_MTD |
355 | extern void ledtrig_mtd_activity(void); | |
356 | #else | |
357 | static inline void ledtrig_mtd_activity(void) {} | |
358 | #endif | |
359 | ||
48a1d032 KM |
360 | #if defined(CONFIG_LEDS_TRIGGER_CAMERA) || defined(CONFIG_LEDS_TRIGGER_CAMERA_MODULE) |
361 | extern void ledtrig_flash_ctrl(bool on); | |
362 | extern void ledtrig_torch_ctrl(bool on); | |
363 | #else | |
364 | static inline void ledtrig_flash_ctrl(bool on) {} | |
365 | static inline void ledtrig_torch_ctrl(bool on) {} | |
366 | #endif | |
367 | ||
f46e9203 NC |
368 | /* |
369 | * Generic LED platform data for describing LED names and default triggers. | |
370 | */ | |
371 | struct led_info { | |
372 | const char *name; | |
326bb8a5 | 373 | const char *default_trigger; |
f46e9203 NC |
374 | int flags; |
375 | }; | |
376 | ||
377 | struct led_platform_data { | |
378 | int num_leds; | |
379 | struct led_info *leds; | |
380 | }; | |
381 | ||
68620e59 HK |
382 | struct gpio_desc; |
383 | typedef int (*gpio_blink_set_t)(struct gpio_desc *desc, int state, | |
384 | unsigned long *delay_on, | |
385 | unsigned long *delay_off); | |
386 | ||
22e03f3b RA |
387 | /* For the leds-gpio driver */ |
388 | struct gpio_led { | |
389 | const char *name; | |
326bb8a5 | 390 | const char *default_trigger; |
22e03f3b | 391 | unsigned gpio; |
ed88bae6 TP |
392 | unsigned active_low : 1; |
393 | unsigned retain_state_suspended : 1; | |
80d6737b | 394 | unsigned panic_indicator : 1; |
ed88bae6 | 395 | unsigned default_state : 2; |
f5808ac1 | 396 | unsigned retain_state_shutdown : 1; |
ed88bae6 | 397 | /* default_state should be one of LEDS_GPIO_DEFSTATE_(ON|OFF|KEEP) */ |
5c51277a | 398 | struct gpio_desc *gpiod; |
22e03f3b | 399 | }; |
2146325d BH |
400 | #define LEDS_GPIO_DEFSTATE_OFF 0 |
401 | #define LEDS_GPIO_DEFSTATE_ON 1 | |
402 | #define LEDS_GPIO_DEFSTATE_KEEP 2 | |
22e03f3b RA |
403 | |
404 | struct gpio_led_platform_data { | |
405 | int num_leds; | |
9517f925 | 406 | const struct gpio_led *leds; |
2146325d BH |
407 | |
408 | #define GPIO_LED_NO_BLINK_LOW 0 /* No blink GPIO state low */ | |
409 | #define GPIO_LED_NO_BLINK_HIGH 1 /* No blink GPIO state high */ | |
9517f925 | 410 | #define GPIO_LED_BLINK 2 /* Please, blink */ |
68620e59 | 411 | gpio_blink_set_t gpio_blink_set; |
22e03f3b RA |
412 | }; |
413 | ||
fca23e47 | 414 | #ifdef CONFIG_NEW_LEDS |
4440673a UKK |
415 | struct platform_device *gpio_led_register_device( |
416 | int id, const struct gpio_led_platform_data *pdata); | |
fca23e47 AD |
417 | #else |
418 | static inline struct platform_device *gpio_led_register_device( | |
419 | int id, const struct gpio_led_platform_data *pdata) | |
420 | { | |
421 | return 0; | |
422 | } | |
423 | #endif | |
22e03f3b | 424 | |
8f88731d BW |
425 | enum cpu_led_event { |
426 | CPU_LED_IDLE_START, /* CPU enters idle */ | |
427 | CPU_LED_IDLE_END, /* CPU idle ends */ | |
428 | CPU_LED_START, /* Machine starts, especially resume */ | |
429 | CPU_LED_STOP, /* Machine stops, especially suspend */ | |
430 | CPU_LED_HALTED, /* Machine shutdown */ | |
431 | }; | |
432 | #ifdef CONFIG_LEDS_TRIGGER_CPU | |
433 | extern void ledtrig_cpu(enum cpu_led_event evt); | |
434 | #else | |
435 | static inline void ledtrig_cpu(enum cpu_led_event evt) | |
436 | { | |
437 | return; | |
438 | } | |
439 | #endif | |
440 | ||
0cb8eb30 HG |
441 | #ifdef CONFIG_LEDS_BRIGHTNESS_HW_CHANGED |
442 | extern void led_classdev_notify_brightness_hw_changed( | |
443 | struct led_classdev *led_cdev, enum led_brightness brightness); | |
444 | #else | |
445 | static inline void led_classdev_notify_brightness_hw_changed( | |
446 | struct led_classdev *led_cdev, enum led_brightness brightness) { } | |
447 | #endif | |
448 | ||
c72a1d60 | 449 | #endif /* __LINUX_LEDS_H_INCLUDED */ |