e3470e732ede8a99125b8407c06428d97c8a7af6
[deliverable/linux.git] / include / linux / leds.h
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/device.h>
16 #include <linux/list.h>
17 #include <linux/mutex.h>
18 #include <linux/rwsem.h>
19 #include <linux/spinlock.h>
20 #include <linux/timer.h>
21 #include <linux/workqueue.h>
22
23 struct device;
24 /*
25 * LED Core
26 */
27
28 enum led_brightness {
29 LED_OFF = 0,
30 LED_HALF = 127,
31 LED_FULL = 255,
32 };
33
34 struct led_classdev {
35 const char *name;
36 enum led_brightness brightness;
37 enum led_brightness max_brightness;
38 int flags;
39
40 /* Lower 16 bits reflect status */
41 #define LED_SUSPENDED (1 << 0)
42 /* Upper 16 bits reflect control information */
43 #define LED_CORE_SUSPENDRESUME (1 << 16)
44 #define LED_BLINK_ONESHOT (1 << 17)
45 #define LED_BLINK_ONESHOT_STOP (1 << 18)
46 #define LED_BLINK_INVERT (1 << 19)
47 #define LED_BLINK_BRIGHTNESS_CHANGE (1 << 20)
48 #define LED_BLINK_DISABLE (1 << 21)
49 #define LED_SYSFS_DISABLE (1 << 22)
50 #define LED_DEV_CAP_FLASH (1 << 23)
51
52 /* Set LED brightness level
53 * Must not sleep. Use brightness_set_blocking for drivers
54 * that can sleep while setting brightness.
55 */
56 void (*brightness_set)(struct led_classdev *led_cdev,
57 enum led_brightness brightness);
58 /*
59 * Set LED brightness level immediately - it can block the caller for
60 * the time required for accessing a LED device register.
61 */
62 int (*brightness_set_blocking)(struct led_classdev *led_cdev,
63 enum led_brightness brightness);
64 /* Get LED brightness level */
65 enum led_brightness (*brightness_get)(struct led_classdev *led_cdev);
66
67 /*
68 * Activate hardware accelerated blink, delays are in milliseconds
69 * and if both are zero then a sensible default should be chosen.
70 * The call should adjust the timings in that case and if it can't
71 * match the values specified exactly.
72 * Deactivate blinking again when the brightness is set to a fixed
73 * value via the brightness_set() callback.
74 */
75 int (*blink_set)(struct led_classdev *led_cdev,
76 unsigned long *delay_on,
77 unsigned long *delay_off);
78
79 struct device *dev;
80 const struct attribute_group **groups;
81
82 struct list_head node; /* LED Device list */
83 const char *default_trigger; /* Trigger to use */
84
85 unsigned long blink_delay_on, blink_delay_off;
86 struct timer_list blink_timer;
87 int blink_brightness;
88 void (*flash_resume)(struct led_classdev *led_cdev);
89
90 struct work_struct set_brightness_work;
91 int delayed_set_value;
92
93 #ifdef CONFIG_LEDS_TRIGGERS
94 /* Protects the trigger data below */
95 struct rw_semaphore trigger_lock;
96
97 struct led_trigger *trigger;
98 struct list_head trig_list;
99 void *trigger_data;
100 /* true if activated - deactivate routine uses it to do cleanup */
101 bool activated;
102 #endif
103
104 /* Ensures consistent access to the LED Flash Class device */
105 struct mutex led_access;
106 };
107
108 extern int led_classdev_register(struct device *parent,
109 struct led_classdev *led_cdev);
110 extern int devm_led_classdev_register(struct device *parent,
111 struct led_classdev *led_cdev);
112 extern void led_classdev_unregister(struct led_classdev *led_cdev);
113 extern void devm_led_classdev_unregister(struct device *parent,
114 struct led_classdev *led_cdev);
115 extern void led_classdev_suspend(struct led_classdev *led_cdev);
116 extern void led_classdev_resume(struct led_classdev *led_cdev);
117
118 /**
119 * led_blink_set - set blinking with software fallback
120 * @led_cdev: the LED to start blinking
121 * @delay_on: the time it should be on (in ms)
122 * @delay_off: the time it should ble off (in ms)
123 *
124 * This function makes the LED blink, attempting to use the
125 * hardware acceleration if possible, but falling back to
126 * software blinking if there is no hardware blinking or if
127 * the LED refuses the passed values.
128 *
129 * Note that if software blinking is active, simply calling
130 * led_cdev->brightness_set() will not stop the blinking,
131 * use led_classdev_brightness_set() instead.
132 */
133 extern void led_blink_set(struct led_classdev *led_cdev,
134 unsigned long *delay_on,
135 unsigned long *delay_off);
136 /**
137 * led_blink_set_oneshot - do a oneshot software blink
138 * @led_cdev: the LED to start blinking
139 * @delay_on: the time it should be on (in ms)
140 * @delay_off: the time it should ble off (in ms)
141 * @invert: blink off, then on, leaving the led on
142 *
143 * This function makes the LED blink one time for delay_on +
144 * delay_off time, ignoring the request if another one-shot
145 * blink is already in progress.
146 *
147 * If invert is set, led blinks for delay_off first, then for
148 * delay_on and leave the led on after the on-off cycle.
149 */
150 extern void led_blink_set_oneshot(struct led_classdev *led_cdev,
151 unsigned long *delay_on,
152 unsigned long *delay_off,
153 int invert);
154 /**
155 * led_set_brightness - set LED brightness
156 * @led_cdev: the LED to set
157 * @brightness: the brightness to set it to
158 *
159 * Set an LED's brightness, and, if necessary, cancel the
160 * software blink timer that implements blinking when the
161 * hardware doesn't. This function is guaranteed not to sleep.
162 */
163 extern void led_set_brightness(struct led_classdev *led_cdev,
164 enum led_brightness brightness);
165
166 /**
167 * led_set_brightness_sync - set LED brightness synchronously
168 * @led_cdev: the LED to set
169 * @brightness: the brightness to set it to
170 *
171 * Set an LED's brightness immediately. This function will block
172 * the caller for the time required for accessing device registers,
173 * and it can sleep.
174 *
175 * Returns: 0 on success or negative error value on failure
176 */
177 extern int led_set_brightness_sync(struct led_classdev *led_cdev,
178 enum led_brightness value);
179
180 /**
181 * led_update_brightness - update LED brightness
182 * @led_cdev: the LED to query
183 *
184 * Get an LED's current brightness and update led_cdev->brightness
185 * member with the obtained value.
186 *
187 * Returns: 0 on success or negative error value on failure
188 */
189 extern int led_update_brightness(struct led_classdev *led_cdev);
190
191 /**
192 * led_sysfs_disable - disable LED sysfs interface
193 * @led_cdev: the LED to set
194 *
195 * Disable the led_cdev's sysfs interface.
196 */
197 extern void led_sysfs_disable(struct led_classdev *led_cdev);
198
199 /**
200 * led_sysfs_enable - enable LED sysfs interface
201 * @led_cdev: the LED to set
202 *
203 * Enable the led_cdev's sysfs interface.
204 */
205 extern void led_sysfs_enable(struct led_classdev *led_cdev);
206
207 /**
208 * led_sysfs_is_disabled - check if LED sysfs interface is disabled
209 * @led_cdev: the LED to query
210 *
211 * Returns: true if the led_cdev's sysfs interface is disabled.
212 */
213 static inline bool led_sysfs_is_disabled(struct led_classdev *led_cdev)
214 {
215 return led_cdev->flags & LED_SYSFS_DISABLE;
216 }
217
218 /*
219 * LED Triggers
220 */
221 /* Registration functions for simple triggers */
222 #define DEFINE_LED_TRIGGER(x) static struct led_trigger *x;
223 #define DEFINE_LED_TRIGGER_GLOBAL(x) struct led_trigger *x;
224
225 #ifdef CONFIG_LEDS_TRIGGERS
226
227 #define TRIG_NAME_MAX 50
228
229 struct led_trigger {
230 /* Trigger Properties */
231 const char *name;
232 void (*activate)(struct led_classdev *led_cdev);
233 void (*deactivate)(struct led_classdev *led_cdev);
234
235 /* LEDs under control by this trigger (for simple triggers) */
236 rwlock_t leddev_list_lock;
237 struct list_head led_cdevs;
238
239 /* Link to next registered trigger */
240 struct list_head next_trig;
241 };
242
243 ssize_t led_trigger_store(struct device *dev, struct device_attribute *attr,
244 const char *buf, size_t count);
245 ssize_t led_trigger_show(struct device *dev, struct device_attribute *attr,
246 char *buf);
247
248 /* Registration functions for complex triggers */
249 extern int led_trigger_register(struct led_trigger *trigger);
250 extern void led_trigger_unregister(struct led_trigger *trigger);
251 extern int devm_led_trigger_register(struct device *dev,
252 struct led_trigger *trigger);
253
254 extern void led_trigger_register_simple(const char *name,
255 struct led_trigger **trigger);
256 extern void led_trigger_unregister_simple(struct led_trigger *trigger);
257 extern void led_trigger_event(struct led_trigger *trigger,
258 enum led_brightness event);
259 extern void led_trigger_blink(struct led_trigger *trigger,
260 unsigned long *delay_on,
261 unsigned long *delay_off);
262 extern void led_trigger_blink_oneshot(struct led_trigger *trigger,
263 unsigned long *delay_on,
264 unsigned long *delay_off,
265 int invert);
266 extern void led_trigger_set_default(struct led_classdev *led_cdev);
267 extern void led_trigger_set(struct led_classdev *led_cdev,
268 struct led_trigger *trigger);
269 extern void led_trigger_remove(struct led_classdev *led_cdev);
270
271 static inline void *led_get_trigger_data(struct led_classdev *led_cdev)
272 {
273 return led_cdev->trigger_data;
274 }
275
276 /**
277 * led_trigger_rename_static - rename a trigger
278 * @name: the new trigger name
279 * @trig: the LED trigger to rename
280 *
281 * Change a LED trigger name by copying the string passed in
282 * name into current trigger name, which MUST be large
283 * enough for the new string.
284 *
285 * Note that name must NOT point to the same string used
286 * during LED registration, as that could lead to races.
287 *
288 * This is meant to be used on triggers with statically
289 * allocated name.
290 */
291 extern void led_trigger_rename_static(const char *name,
292 struct led_trigger *trig);
293
294 #else
295
296 /* Trigger has no members */
297 struct led_trigger {};
298
299 /* Trigger inline empty functions */
300 static inline void led_trigger_register_simple(const char *name,
301 struct led_trigger **trigger) {}
302 static inline void led_trigger_unregister_simple(struct led_trigger *trigger) {}
303 static inline void led_trigger_event(struct led_trigger *trigger,
304 enum led_brightness event) {}
305 static inline void led_trigger_blink(struct led_trigger *trigger,
306 unsigned long *delay_on,
307 unsigned long *delay_off) {}
308 static inline void led_trigger_blink_oneshot(struct led_trigger *trigger,
309 unsigned long *delay_on,
310 unsigned long *delay_off,
311 int invert) {}
312 static inline void led_trigger_set_default(struct led_classdev *led_cdev) {}
313 static inline void led_trigger_set(struct led_classdev *led_cdev,
314 struct led_trigger *trigger) {}
315 static inline void led_trigger_remove(struct led_classdev *led_cdev) {}
316 static inline void *led_get_trigger_data(struct led_classdev *led_cdev)
317 {
318 return NULL;
319 }
320
321 #endif /* CONFIG_LEDS_TRIGGERS */
322
323 /* Trigger specific functions */
324 #ifdef CONFIG_LEDS_TRIGGER_IDE_DISK
325 extern void ledtrig_ide_activity(void);
326 #else
327 static inline void ledtrig_ide_activity(void) {}
328 #endif
329
330 #if defined(CONFIG_LEDS_TRIGGER_CAMERA) || defined(CONFIG_LEDS_TRIGGER_CAMERA_MODULE)
331 extern void ledtrig_flash_ctrl(bool on);
332 extern void ledtrig_torch_ctrl(bool on);
333 #else
334 static inline void ledtrig_flash_ctrl(bool on) {}
335 static inline void ledtrig_torch_ctrl(bool on) {}
336 #endif
337
338 /*
339 * Generic LED platform data for describing LED names and default triggers.
340 */
341 struct led_info {
342 const char *name;
343 const char *default_trigger;
344 int flags;
345 };
346
347 struct led_platform_data {
348 int num_leds;
349 struct led_info *leds;
350 };
351
352 /* For the leds-gpio driver */
353 struct gpio_led {
354 const char *name;
355 const char *default_trigger;
356 unsigned gpio;
357 unsigned active_low : 1;
358 unsigned retain_state_suspended : 1;
359 unsigned default_state : 2;
360 /* default_state should be one of LEDS_GPIO_DEFSTATE_(ON|OFF|KEEP) */
361 struct gpio_desc *gpiod;
362 };
363 #define LEDS_GPIO_DEFSTATE_OFF 0
364 #define LEDS_GPIO_DEFSTATE_ON 1
365 #define LEDS_GPIO_DEFSTATE_KEEP 2
366
367 struct gpio_led_platform_data {
368 int num_leds;
369 const struct gpio_led *leds;
370
371 #define GPIO_LED_NO_BLINK_LOW 0 /* No blink GPIO state low */
372 #define GPIO_LED_NO_BLINK_HIGH 1 /* No blink GPIO state high */
373 #define GPIO_LED_BLINK 2 /* Please, blink */
374 int (*gpio_blink_set)(struct gpio_desc *desc, int state,
375 unsigned long *delay_on,
376 unsigned long *delay_off);
377 };
378
379 struct platform_device *gpio_led_register_device(
380 int id, const struct gpio_led_platform_data *pdata);
381
382 enum cpu_led_event {
383 CPU_LED_IDLE_START, /* CPU enters idle */
384 CPU_LED_IDLE_END, /* CPU idle ends */
385 CPU_LED_START, /* Machine starts, especially resume */
386 CPU_LED_STOP, /* Machine stops, especially suspend */
387 CPU_LED_HALTED, /* Machine shutdown */
388 };
389 #ifdef CONFIG_LEDS_TRIGGER_CPU
390 extern void ledtrig_cpu(enum cpu_led_event evt);
391 #else
392 static inline void ledtrig_cpu(enum cpu_led_event evt)
393 {
394 return;
395 }
396 #endif
397
398 #endif /* __LINUX_LEDS_H_INCLUDED */
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