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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 */ |
fb5035db | 43 | #define LED_SUSPENDED (1 << 0) |
d84d80f3 | 44 | #define LED_UNREGISTERING (1 << 1) |
859cb7f2 RP |
45 | /* Upper 16 bits reflect control information */ |
46 | #define LED_CORE_SUSPENDRESUME (1 << 16) | |
a9c6ce57 HG |
47 | #define LED_SYSFS_DISABLE (1 << 17) |
48 | #define LED_DEV_CAP_FLASH (1 << 18) | |
49 | #define LED_HW_PLUGGABLE (1 << 19) | |
50 | #define LED_PANIC_INDICATOR (1 << 20) | |
0cb8eb30 | 51 | #define LED_BRIGHT_HW_CHANGED (1 << 21) |
a9c6ce57 HG |
52 | |
53 | /* set_brightness_work / blink_timer flags, atomic, private. */ | |
54 | unsigned long work_flags; | |
55 | ||
56 | #define LED_BLINK_SW 0 | |
57 | #define LED_BLINK_ONESHOT 1 | |
58 | #define LED_BLINK_ONESHOT_STOP 2 | |
59 | #define LED_BLINK_INVERT 3 | |
60 | #define LED_BLINK_BRIGHTNESS_CHANGE 4 | |
61 | #define LED_BLINK_DISABLE 5 | |
c72a1d60 | 62 | |
70b2563b HK |
63 | /* Set LED brightness level |
64 | * Must not sleep. Use brightness_set_blocking for drivers | |
65 | * that can sleep while setting brightness. | |
66 | */ | |
fb5035db BD |
67 | void (*brightness_set)(struct led_classdev *led_cdev, |
68 | enum led_brightness brightness); | |
4d71a4a1 JA |
69 | /* |
70 | * Set LED brightness level immediately - it can block the caller for | |
71 | * the time required for accessing a LED device register. | |
72 | */ | |
437a4240 JA |
73 | int (*brightness_set_blocking)(struct led_classdev *led_cdev, |
74 | enum led_brightness brightness); | |
29d76dfa HMH |
75 | /* Get LED brightness level */ |
76 | enum led_brightness (*brightness_get)(struct led_classdev *led_cdev); | |
fb5035db | 77 | |
5ada28bf JB |
78 | /* |
79 | * Activate hardware accelerated blink, delays are in milliseconds | |
80 | * and if both are zero then a sensible default should be chosen. | |
81 | * The call should adjust the timings in that case and if it can't | |
82 | * match the values specified exactly. | |
7cfe749f TM |
83 | * Deactivate blinking again when the brightness is set to LED_OFF |
84 | * via the brightness_set() callback. | |
5ada28bf | 85 | */ |
4c79141d MN |
86 | int (*blink_set)(struct led_classdev *led_cdev, |
87 | unsigned long *delay_on, | |
88 | unsigned long *delay_off); | |
89 | ||
f8a7c6fe | 90 | struct device *dev; |
d0d480cc JH |
91 | const struct attribute_group **groups; |
92 | ||
fb5035db | 93 | struct list_head node; /* LED Device list */ |
781a54e7 | 94 | const char *default_trigger; /* Trigger to use */ |
c72a1d60 | 95 | |
5ada28bf | 96 | unsigned long blink_delay_on, blink_delay_off; |
9067359f | 97 | struct timer_list blink_timer; |
5ada28bf | 98 | int blink_brightness; |
eb1610b4 | 99 | int new_blink_brightness; |
7aea8389 | 100 | void (*flash_resume)(struct led_classdev *led_cdev); |
5ada28bf | 101 | |
d23a22a7 FB |
102 | struct work_struct set_brightness_work; |
103 | int delayed_set_value; | |
104 | ||
c3bc9956 | 105 | #ifdef CONFIG_LEDS_TRIGGERS |
c3bc9956 | 106 | /* Protects the trigger data below */ |
dc47206e | 107 | struct rw_semaphore trigger_lock; |
c3bc9956 | 108 | |
fb5035db BD |
109 | struct led_trigger *trigger; |
110 | struct list_head trig_list; | |
111 | void *trigger_data; | |
b0096182 SK |
112 | /* true if activated - deactivate routine uses it to do cleanup */ |
113 | bool activated; | |
c3bc9956 | 114 | #endif |
acd899e4 | 115 | |
0cb8eb30 HG |
116 | #ifdef CONFIG_LEDS_BRIGHTNESS_HW_CHANGED |
117 | int brightness_hw_changed; | |
118 | struct kernfs_node *brightness_hw_changed_kn; | |
119 | #endif | |
120 | ||
acd899e4 JA |
121 | /* Ensures consistent access to the LED Flash Class device */ |
122 | struct mutex led_access; | |
c72a1d60 RP |
123 | }; |
124 | ||
442c6098 RM |
125 | extern int of_led_classdev_register(struct device *parent, |
126 | struct device_node *np, | |
127 | struct led_classdev *led_cdev); | |
128 | #define led_classdev_register(parent, led_cdev) \ | |
129 | of_led_classdev_register(parent, NULL, led_cdev) | |
130 | extern int devm_of_led_classdev_register(struct device *parent, | |
131 | struct device_node *np, | |
132 | struct led_classdev *led_cdev); | |
133 | #define devm_led_classdev_register(parent, led_cdev) \ | |
134 | devm_of_led_classdev_register(parent, NULL, led_cdev) | |
e2387d6c | 135 | extern void led_classdev_unregister(struct led_classdev *led_cdev); |
ca1bb4ee BA |
136 | extern void devm_led_classdev_unregister(struct device *parent, |
137 | struct led_classdev *led_cdev); | |
c72a1d60 RP |
138 | extern void led_classdev_suspend(struct led_classdev *led_cdev); |
139 | extern void led_classdev_resume(struct led_classdev *led_cdev); | |
140 | ||
5ada28bf JB |
141 | /** |
142 | * led_blink_set - set blinking with software fallback | |
143 | * @led_cdev: the LED to start blinking | |
144 | * @delay_on: the time it should be on (in ms) | |
145 | * @delay_off: the time it should ble off (in ms) | |
146 | * | |
147 | * This function makes the LED blink, attempting to use the | |
148 | * hardware acceleration if possible, but falling back to | |
149 | * software blinking if there is no hardware blinking or if | |
150 | * the LED refuses the passed values. | |
151 | * | |
152 | * Note that if software blinking is active, simply calling | |
153 | * led_cdev->brightness_set() will not stop the blinking, | |
154 | * use led_classdev_brightness_set() instead. | |
155 | */ | |
156 | extern void led_blink_set(struct led_classdev *led_cdev, | |
157 | unsigned long *delay_on, | |
158 | unsigned long *delay_off); | |
5bb629c5 FB |
159 | /** |
160 | * led_blink_set_oneshot - do a oneshot software blink | |
161 | * @led_cdev: the LED to start blinking | |
162 | * @delay_on: the time it should be on (in ms) | |
163 | * @delay_off: the time it should ble off (in ms) | |
164 | * @invert: blink off, then on, leaving the led on | |
165 | * | |
166 | * This function makes the LED blink one time for delay_on + | |
167 | * delay_off time, ignoring the request if another one-shot | |
168 | * blink is already in progress. | |
169 | * | |
170 | * If invert is set, led blinks for delay_off first, then for | |
171 | * delay_on and leave the led on after the on-off cycle. | |
172 | */ | |
173 | extern void led_blink_set_oneshot(struct led_classdev *led_cdev, | |
174 | unsigned long *delay_on, | |
175 | unsigned long *delay_off, | |
176 | int invert); | |
5ada28bf | 177 | /** |
19cd67e2 | 178 | * led_set_brightness - set LED brightness |
5ada28bf JB |
179 | * @led_cdev: the LED to set |
180 | * @brightness: the brightness to set it to | |
181 | * | |
182 | * Set an LED's brightness, and, if necessary, cancel the | |
183 | * software blink timer that implements blinking when the | |
1afcadfc | 184 | * hardware doesn't. This function is guaranteed not to sleep. |
5ada28bf | 185 | */ |
19cd67e2 | 186 | extern void led_set_brightness(struct led_classdev *led_cdev, |
5ada28bf | 187 | enum led_brightness brightness); |
13ae79bb JA |
188 | |
189 | /** | |
190 | * led_set_brightness_sync - set LED brightness synchronously | |
191 | * @led_cdev: the LED to set | |
192 | * @brightness: the brightness to set it to | |
193 | * | |
194 | * Set an LED's brightness immediately. This function will block | |
195 | * the caller for the time required for accessing device registers, | |
196 | * and it can sleep. | |
197 | * | |
198 | * Returns: 0 on success or negative error value on failure | |
199 | */ | |
200 | extern int led_set_brightness_sync(struct led_classdev *led_cdev, | |
201 | enum led_brightness value); | |
202 | ||
3ef7de53 JA |
203 | /** |
204 | * led_update_brightness - update LED brightness | |
205 | * @led_cdev: the LED to query | |
206 | * | |
207 | * Get an LED's current brightness and update led_cdev->brightness | |
208 | * member with the obtained value. | |
209 | * | |
210 | * Returns: 0 on success or negative error value on failure | |
211 | */ | |
212 | extern int led_update_brightness(struct led_classdev *led_cdev); | |
5ada28bf | 213 | |
acd899e4 JA |
214 | /** |
215 | * led_sysfs_disable - disable LED sysfs interface | |
216 | * @led_cdev: the LED to set | |
217 | * | |
218 | * Disable the led_cdev's sysfs interface. | |
219 | */ | |
220 | extern void led_sysfs_disable(struct led_classdev *led_cdev); | |
221 | ||
222 | /** | |
223 | * led_sysfs_enable - enable LED sysfs interface | |
224 | * @led_cdev: the LED to set | |
225 | * | |
226 | * Enable the led_cdev's sysfs interface. | |
227 | */ | |
228 | extern void led_sysfs_enable(struct led_classdev *led_cdev); | |
229 | ||
230 | /** | |
231 | * led_sysfs_is_disabled - check if LED sysfs interface is disabled | |
232 | * @led_cdev: the LED to query | |
233 | * | |
234 | * Returns: true if the led_cdev's sysfs interface is disabled. | |
235 | */ | |
236 | static inline bool led_sysfs_is_disabled(struct led_classdev *led_cdev) | |
237 | { | |
238 | return led_cdev->flags & LED_SYSFS_DISABLE; | |
239 | } | |
240 | ||
c3bc9956 RP |
241 | /* |
242 | * LED Triggers | |
243 | */ | |
39f7e08a KM |
244 | /* Registration functions for simple triggers */ |
245 | #define DEFINE_LED_TRIGGER(x) static struct led_trigger *x; | |
246 | #define DEFINE_LED_TRIGGER_GLOBAL(x) struct led_trigger *x; | |
247 | ||
c3bc9956 RP |
248 | #ifdef CONFIG_LEDS_TRIGGERS |
249 | ||
250 | #define TRIG_NAME_MAX 50 | |
251 | ||
252 | struct led_trigger { | |
253 | /* Trigger Properties */ | |
fb5035db BD |
254 | const char *name; |
255 | void (*activate)(struct led_classdev *led_cdev); | |
256 | void (*deactivate)(struct led_classdev *led_cdev); | |
c3bc9956 RP |
257 | |
258 | /* LEDs under control by this trigger (for simple triggers) */ | |
fb5035db BD |
259 | rwlock_t leddev_list_lock; |
260 | struct list_head led_cdevs; | |
c3bc9956 RP |
261 | |
262 | /* Link to next registered trigger */ | |
fb5035db | 263 | struct list_head next_trig; |
c3bc9956 RP |
264 | }; |
265 | ||
20f56758 JA |
266 | ssize_t led_trigger_store(struct device *dev, struct device_attribute *attr, |
267 | const char *buf, size_t count); | |
268 | ssize_t led_trigger_show(struct device *dev, struct device_attribute *attr, | |
269 | char *buf); | |
270 | ||
c3bc9956 RP |
271 | /* Registration functions for complex triggers */ |
272 | extern int led_trigger_register(struct led_trigger *trigger); | |
273 | extern void led_trigger_unregister(struct led_trigger *trigger); | |
9534cc31 HK |
274 | extern int devm_led_trigger_register(struct device *dev, |
275 | struct led_trigger *trigger); | |
c3bc9956 | 276 | |
c3bc9956 RP |
277 | extern void led_trigger_register_simple(const char *name, |
278 | struct led_trigger **trigger); | |
279 | extern void led_trigger_unregister_simple(struct led_trigger *trigger); | |
280 | extern void led_trigger_event(struct led_trigger *trigger, | |
281 | enum led_brightness event); | |
0b9536c9 VK |
282 | extern void led_trigger_blink(struct led_trigger *trigger, |
283 | unsigned long *delay_on, | |
284 | unsigned long *delay_off); | |
5bb629c5 FB |
285 | extern void led_trigger_blink_oneshot(struct led_trigger *trigger, |
286 | unsigned long *delay_on, | |
287 | unsigned long *delay_off, | |
288 | int invert); | |
20f56758 JA |
289 | extern void led_trigger_set_default(struct led_classdev *led_cdev); |
290 | extern void led_trigger_set(struct led_classdev *led_cdev, | |
291 | struct led_trigger *trigger); | |
292 | extern void led_trigger_remove(struct led_classdev *led_cdev); | |
293 | ||
294 | static inline void *led_get_trigger_data(struct led_classdev *led_cdev) | |
295 | { | |
296 | return led_cdev->trigger_data; | |
297 | } | |
298 | ||
057407c7 JH |
299 | /** |
300 | * led_trigger_rename_static - rename a trigger | |
301 | * @name: the new trigger name | |
302 | * @trig: the LED trigger to rename | |
303 | * | |
304 | * Change a LED trigger name by copying the string passed in | |
305 | * name into current trigger name, which MUST be large | |
306 | * enough for the new string. | |
307 | * | |
308 | * Note that name must NOT point to the same string used | |
309 | * during LED registration, as that could lead to races. | |
310 | * | |
311 | * This is meant to be used on triggers with statically | |
312 | * allocated name. | |
313 | */ | |
314 | extern void led_trigger_rename_static(const char *name, | |
315 | struct led_trigger *trig); | |
c3bc9956 RP |
316 | |
317 | #else | |
318 | ||
39f7e08a KM |
319 | /* Trigger has no members */ |
320 | struct led_trigger {}; | |
c3bc9956 | 321 | |
39f7e08a KM |
322 | /* Trigger inline empty functions */ |
323 | static inline void led_trigger_register_simple(const char *name, | |
324 | struct led_trigger **trigger) {} | |
325 | static inline void led_trigger_unregister_simple(struct led_trigger *trigger) {} | |
326 | static inline void led_trigger_event(struct led_trigger *trigger, | |
327 | enum led_brightness event) {} | |
8890624a MG |
328 | static inline void led_trigger_blink(struct led_trigger *trigger, |
329 | unsigned long *delay_on, | |
330 | unsigned long *delay_off) {} | |
331 | static inline void led_trigger_blink_oneshot(struct led_trigger *trigger, | |
332 | unsigned long *delay_on, | |
333 | unsigned long *delay_off, | |
334 | int invert) {} | |
20f56758 JA |
335 | static inline void led_trigger_set_default(struct led_classdev *led_cdev) {} |
336 | static inline void led_trigger_set(struct led_classdev *led_cdev, | |
337 | struct led_trigger *trigger) {} | |
338 | static inline void led_trigger_remove(struct led_classdev *led_cdev) {} | |
339 | static inline void *led_get_trigger_data(struct led_classdev *led_cdev) | |
340 | { | |
341 | return NULL; | |
342 | } | |
343 | ||
39f7e08a | 344 | #endif /* CONFIG_LEDS_TRIGGERS */ |
2bfb646c RP |
345 | |
346 | /* Trigger specific functions */ | |
eb25cb99 SL |
347 | #ifdef CONFIG_LEDS_TRIGGER_DISK |
348 | extern void ledtrig_disk_activity(void); | |
2bfb646c | 349 | #else |
eb25cb99 | 350 | static inline void ledtrig_disk_activity(void) {} |
2bfb646c RP |
351 | #endif |
352 | ||
4b721174 EG |
353 | #ifdef CONFIG_LEDS_TRIGGER_MTD |
354 | extern void ledtrig_mtd_activity(void); | |
355 | #else | |
356 | static inline void ledtrig_mtd_activity(void) {} | |
357 | #endif | |
358 | ||
48a1d032 KM |
359 | #if defined(CONFIG_LEDS_TRIGGER_CAMERA) || defined(CONFIG_LEDS_TRIGGER_CAMERA_MODULE) |
360 | extern void ledtrig_flash_ctrl(bool on); | |
361 | extern void ledtrig_torch_ctrl(bool on); | |
362 | #else | |
363 | static inline void ledtrig_flash_ctrl(bool on) {} | |
364 | static inline void ledtrig_torch_ctrl(bool on) {} | |
365 | #endif | |
366 | ||
f46e9203 NC |
367 | /* |
368 | * Generic LED platform data for describing LED names and default triggers. | |
369 | */ | |
370 | struct led_info { | |
371 | const char *name; | |
326bb8a5 | 372 | const char *default_trigger; |
f46e9203 NC |
373 | int flags; |
374 | }; | |
375 | ||
376 | struct led_platform_data { | |
377 | int num_leds; | |
378 | struct led_info *leds; | |
379 | }; | |
380 | ||
68620e59 HK |
381 | struct gpio_desc; |
382 | typedef int (*gpio_blink_set_t)(struct gpio_desc *desc, int state, | |
383 | unsigned long *delay_on, | |
384 | unsigned long *delay_off); | |
385 | ||
22e03f3b RA |
386 | /* For the leds-gpio driver */ |
387 | struct gpio_led { | |
388 | const char *name; | |
326bb8a5 | 389 | const char *default_trigger; |
22e03f3b | 390 | unsigned gpio; |
ed88bae6 TP |
391 | unsigned active_low : 1; |
392 | unsigned retain_state_suspended : 1; | |
80d6737b | 393 | unsigned panic_indicator : 1; |
ed88bae6 TP |
394 | unsigned default_state : 2; |
395 | /* default_state should be one of LEDS_GPIO_DEFSTATE_(ON|OFF|KEEP) */ | |
5c51277a | 396 | struct gpio_desc *gpiod; |
22e03f3b | 397 | }; |
2146325d BH |
398 | #define LEDS_GPIO_DEFSTATE_OFF 0 |
399 | #define LEDS_GPIO_DEFSTATE_ON 1 | |
400 | #define LEDS_GPIO_DEFSTATE_KEEP 2 | |
22e03f3b RA |
401 | |
402 | struct gpio_led_platform_data { | |
403 | int num_leds; | |
9517f925 | 404 | const struct gpio_led *leds; |
2146325d BH |
405 | |
406 | #define GPIO_LED_NO_BLINK_LOW 0 /* No blink GPIO state low */ | |
407 | #define GPIO_LED_NO_BLINK_HIGH 1 /* No blink GPIO state high */ | |
9517f925 | 408 | #define GPIO_LED_BLINK 2 /* Please, blink */ |
68620e59 | 409 | gpio_blink_set_t gpio_blink_set; |
22e03f3b RA |
410 | }; |
411 | ||
fca23e47 | 412 | #ifdef CONFIG_NEW_LEDS |
4440673a UKK |
413 | struct platform_device *gpio_led_register_device( |
414 | int id, const struct gpio_led_platform_data *pdata); | |
fca23e47 AD |
415 | #else |
416 | static inline struct platform_device *gpio_led_register_device( | |
417 | int id, const struct gpio_led_platform_data *pdata) | |
418 | { | |
419 | return 0; | |
420 | } | |
421 | #endif | |
22e03f3b | 422 | |
8f88731d BW |
423 | enum cpu_led_event { |
424 | CPU_LED_IDLE_START, /* CPU enters idle */ | |
425 | CPU_LED_IDLE_END, /* CPU idle ends */ | |
426 | CPU_LED_START, /* Machine starts, especially resume */ | |
427 | CPU_LED_STOP, /* Machine stops, especially suspend */ | |
428 | CPU_LED_HALTED, /* Machine shutdown */ | |
429 | }; | |
430 | #ifdef CONFIG_LEDS_TRIGGER_CPU | |
431 | extern void ledtrig_cpu(enum cpu_led_event evt); | |
432 | #else | |
433 | static inline void ledtrig_cpu(enum cpu_led_event evt) | |
434 | { | |
435 | return; | |
436 | } | |
437 | #endif | |
438 | ||
0cb8eb30 HG |
439 | #ifdef CONFIG_LEDS_BRIGHTNESS_HW_CHANGED |
440 | extern void led_classdev_notify_brightness_hw_changed( | |
441 | struct led_classdev *led_cdev, enum led_brightness brightness); | |
442 | #else | |
443 | static inline void led_classdev_notify_brightness_hw_changed( | |
444 | struct led_classdev *led_cdev, enum led_brightness brightness) { } | |
445 | #endif | |
446 | ||
c72a1d60 | 447 | #endif /* __LINUX_LEDS_H_INCLUDED */ |