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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> |
acd899e4 | 16 | #include <linux/mutex.h> |
dc47206e | 17 | #include <linux/rwsem.h> |
04713306 | 18 | #include <linux/spinlock.h> |
9067359f | 19 | #include <linux/timer.h> |
d23a22a7 | 20 | #include <linux/workqueue.h> |
af410fc1 | 21 | |
c72a1d60 | 22 | struct device; |
c72a1d60 RP |
23 | /* |
24 | * LED Core | |
25 | */ | |
26 | ||
27 | enum led_brightness { | |
fb5035db BD |
28 | LED_OFF = 0, |
29 | LED_HALF = 127, | |
30 | LED_FULL = 255, | |
c72a1d60 RP |
31 | }; |
32 | ||
33 | struct led_classdev { | |
fb5035db | 34 | const char *name; |
d8082827 JA |
35 | enum led_brightness brightness; |
36 | enum led_brightness max_brightness; | |
fb5035db | 37 | int flags; |
c72a1d60 | 38 | |
859cb7f2 | 39 | /* Lower 16 bits reflect status */ |
fb5035db | 40 | #define LED_SUSPENDED (1 << 0) |
859cb7f2 RP |
41 | /* Upper 16 bits reflect control information */ |
42 | #define LED_CORE_SUSPENDRESUME (1 << 16) | |
5bb629c5 FB |
43 | #define LED_BLINK_ONESHOT (1 << 17) |
44 | #define LED_BLINK_ONESHOT_STOP (1 << 18) | |
45 | #define LED_BLINK_INVERT (1 << 19) | |
acd899e4 | 46 | #define LED_SYSFS_DISABLE (1 << 20) |
c72a1d60 | 47 | |
fb5035db | 48 | /* Set LED brightness level */ |
2e214e0f | 49 | /* Must not sleep, use a workqueue if needed */ |
fb5035db BD |
50 | void (*brightness_set)(struct led_classdev *led_cdev, |
51 | enum led_brightness brightness); | |
29d76dfa HMH |
52 | /* Get LED brightness level */ |
53 | enum led_brightness (*brightness_get)(struct led_classdev *led_cdev); | |
fb5035db | 54 | |
5ada28bf JB |
55 | /* |
56 | * Activate hardware accelerated blink, delays are in milliseconds | |
57 | * and if both are zero then a sensible default should be chosen. | |
58 | * The call should adjust the timings in that case and if it can't | |
59 | * match the values specified exactly. | |
60 | * Deactivate blinking again when the brightness is set to a fixed | |
61 | * value via the brightness_set() callback. | |
62 | */ | |
4c79141d MN |
63 | int (*blink_set)(struct led_classdev *led_cdev, |
64 | unsigned long *delay_on, | |
65 | unsigned long *delay_off); | |
66 | ||
f8a7c6fe | 67 | struct device *dev; |
d0d480cc JH |
68 | const struct attribute_group **groups; |
69 | ||
fb5035db | 70 | struct list_head node; /* LED Device list */ |
781a54e7 | 71 | const char *default_trigger; /* Trigger to use */ |
c72a1d60 | 72 | |
5ada28bf | 73 | unsigned long blink_delay_on, blink_delay_off; |
9067359f | 74 | struct timer_list blink_timer; |
5ada28bf JB |
75 | int blink_brightness; |
76 | ||
d23a22a7 FB |
77 | struct work_struct set_brightness_work; |
78 | int delayed_set_value; | |
79 | ||
c3bc9956 | 80 | #ifdef CONFIG_LEDS_TRIGGERS |
c3bc9956 | 81 | /* Protects the trigger data below */ |
dc47206e | 82 | struct rw_semaphore trigger_lock; |
c3bc9956 | 83 | |
fb5035db BD |
84 | struct led_trigger *trigger; |
85 | struct list_head trig_list; | |
86 | void *trigger_data; | |
b0096182 SK |
87 | /* true if activated - deactivate routine uses it to do cleanup */ |
88 | bool activated; | |
c3bc9956 | 89 | #endif |
acd899e4 JA |
90 | |
91 | /* Ensures consistent access to the LED Flash Class device */ | |
92 | struct mutex led_access; | |
c72a1d60 RP |
93 | }; |
94 | ||
95 | extern int led_classdev_register(struct device *parent, | |
fb5035db | 96 | struct led_classdev *led_cdev); |
e2387d6c | 97 | extern void led_classdev_unregister(struct led_classdev *led_cdev); |
c72a1d60 RP |
98 | extern void led_classdev_suspend(struct led_classdev *led_cdev); |
99 | extern void led_classdev_resume(struct led_classdev *led_cdev); | |
100 | ||
5ada28bf JB |
101 | /** |
102 | * led_blink_set - set blinking with software fallback | |
103 | * @led_cdev: the LED to start blinking | |
104 | * @delay_on: the time it should be on (in ms) | |
105 | * @delay_off: the time it should ble off (in ms) | |
106 | * | |
107 | * This function makes the LED blink, attempting to use the | |
108 | * hardware acceleration if possible, but falling back to | |
109 | * software blinking if there is no hardware blinking or if | |
110 | * the LED refuses the passed values. | |
111 | * | |
112 | * Note that if software blinking is active, simply calling | |
113 | * led_cdev->brightness_set() will not stop the blinking, | |
114 | * use led_classdev_brightness_set() instead. | |
115 | */ | |
116 | extern void led_blink_set(struct led_classdev *led_cdev, | |
117 | unsigned long *delay_on, | |
118 | unsigned long *delay_off); | |
5bb629c5 FB |
119 | /** |
120 | * led_blink_set_oneshot - do a oneshot software blink | |
121 | * @led_cdev: the LED to start blinking | |
122 | * @delay_on: the time it should be on (in ms) | |
123 | * @delay_off: the time it should ble off (in ms) | |
124 | * @invert: blink off, then on, leaving the led on | |
125 | * | |
126 | * This function makes the LED blink one time for delay_on + | |
127 | * delay_off time, ignoring the request if another one-shot | |
128 | * blink is already in progress. | |
129 | * | |
130 | * If invert is set, led blinks for delay_off first, then for | |
131 | * delay_on and leave the led on after the on-off cycle. | |
132 | */ | |
133 | extern void led_blink_set_oneshot(struct led_classdev *led_cdev, | |
134 | unsigned long *delay_on, | |
135 | unsigned long *delay_off, | |
136 | int invert); | |
5ada28bf | 137 | /** |
19cd67e2 | 138 | * led_set_brightness - set LED brightness |
5ada28bf JB |
139 | * @led_cdev: the LED to set |
140 | * @brightness: the brightness to set it to | |
141 | * | |
142 | * Set an LED's brightness, and, if necessary, cancel the | |
143 | * software blink timer that implements blinking when the | |
144 | * hardware doesn't. | |
145 | */ | |
19cd67e2 | 146 | extern void led_set_brightness(struct led_classdev *led_cdev, |
5ada28bf | 147 | enum led_brightness brightness); |
3ef7de53 JA |
148 | /** |
149 | * led_update_brightness - update LED brightness | |
150 | * @led_cdev: the LED to query | |
151 | * | |
152 | * Get an LED's current brightness and update led_cdev->brightness | |
153 | * member with the obtained value. | |
154 | * | |
155 | * Returns: 0 on success or negative error value on failure | |
156 | */ | |
157 | extern int led_update_brightness(struct led_classdev *led_cdev); | |
5ada28bf | 158 | |
acd899e4 JA |
159 | /** |
160 | * led_sysfs_disable - disable LED sysfs interface | |
161 | * @led_cdev: the LED to set | |
162 | * | |
163 | * Disable the led_cdev's sysfs interface. | |
164 | */ | |
165 | extern void led_sysfs_disable(struct led_classdev *led_cdev); | |
166 | ||
167 | /** | |
168 | * led_sysfs_enable - enable LED sysfs interface | |
169 | * @led_cdev: the LED to set | |
170 | * | |
171 | * Enable the led_cdev's sysfs interface. | |
172 | */ | |
173 | extern void led_sysfs_enable(struct led_classdev *led_cdev); | |
174 | ||
175 | /** | |
176 | * led_sysfs_is_disabled - check if LED sysfs interface is disabled | |
177 | * @led_cdev: the LED to query | |
178 | * | |
179 | * Returns: true if the led_cdev's sysfs interface is disabled. | |
180 | */ | |
181 | static inline bool led_sysfs_is_disabled(struct led_classdev *led_cdev) | |
182 | { | |
183 | return led_cdev->flags & LED_SYSFS_DISABLE; | |
184 | } | |
185 | ||
c3bc9956 RP |
186 | /* |
187 | * LED Triggers | |
188 | */ | |
39f7e08a KM |
189 | /* Registration functions for simple triggers */ |
190 | #define DEFINE_LED_TRIGGER(x) static struct led_trigger *x; | |
191 | #define DEFINE_LED_TRIGGER_GLOBAL(x) struct led_trigger *x; | |
192 | ||
c3bc9956 RP |
193 | #ifdef CONFIG_LEDS_TRIGGERS |
194 | ||
195 | #define TRIG_NAME_MAX 50 | |
196 | ||
197 | struct led_trigger { | |
198 | /* Trigger Properties */ | |
fb5035db BD |
199 | const char *name; |
200 | void (*activate)(struct led_classdev *led_cdev); | |
201 | void (*deactivate)(struct led_classdev *led_cdev); | |
c3bc9956 RP |
202 | |
203 | /* LEDs under control by this trigger (for simple triggers) */ | |
fb5035db BD |
204 | rwlock_t leddev_list_lock; |
205 | struct list_head led_cdevs; | |
c3bc9956 RP |
206 | |
207 | /* Link to next registered trigger */ | |
fb5035db | 208 | struct list_head next_trig; |
c3bc9956 RP |
209 | }; |
210 | ||
211 | /* Registration functions for complex triggers */ | |
212 | extern int led_trigger_register(struct led_trigger *trigger); | |
213 | extern void led_trigger_unregister(struct led_trigger *trigger); | |
214 | ||
c3bc9956 RP |
215 | extern void led_trigger_register_simple(const char *name, |
216 | struct led_trigger **trigger); | |
217 | extern void led_trigger_unregister_simple(struct led_trigger *trigger); | |
218 | extern void led_trigger_event(struct led_trigger *trigger, | |
219 | enum led_brightness event); | |
0b9536c9 VK |
220 | extern void led_trigger_blink(struct led_trigger *trigger, |
221 | unsigned long *delay_on, | |
222 | unsigned long *delay_off); | |
5bb629c5 FB |
223 | extern void led_trigger_blink_oneshot(struct led_trigger *trigger, |
224 | unsigned long *delay_on, | |
225 | unsigned long *delay_off, | |
226 | int invert); | |
057407c7 JH |
227 | /** |
228 | * led_trigger_rename_static - rename a trigger | |
229 | * @name: the new trigger name | |
230 | * @trig: the LED trigger to rename | |
231 | * | |
232 | * Change a LED trigger name by copying the string passed in | |
233 | * name into current trigger name, which MUST be large | |
234 | * enough for the new string. | |
235 | * | |
236 | * Note that name must NOT point to the same string used | |
237 | * during LED registration, as that could lead to races. | |
238 | * | |
239 | * This is meant to be used on triggers with statically | |
240 | * allocated name. | |
241 | */ | |
242 | extern void led_trigger_rename_static(const char *name, | |
243 | struct led_trigger *trig); | |
c3bc9956 RP |
244 | |
245 | #else | |
246 | ||
39f7e08a KM |
247 | /* Trigger has no members */ |
248 | struct led_trigger {}; | |
c3bc9956 | 249 | |
39f7e08a KM |
250 | /* Trigger inline empty functions */ |
251 | static inline void led_trigger_register_simple(const char *name, | |
252 | struct led_trigger **trigger) {} | |
253 | static inline void led_trigger_unregister_simple(struct led_trigger *trigger) {} | |
254 | static inline void led_trigger_event(struct led_trigger *trigger, | |
255 | enum led_brightness event) {} | |
256 | #endif /* CONFIG_LEDS_TRIGGERS */ | |
2bfb646c RP |
257 | |
258 | /* Trigger specific functions */ | |
259 | #ifdef CONFIG_LEDS_TRIGGER_IDE_DISK | |
260 | extern void ledtrig_ide_activity(void); | |
261 | #else | |
39f7e08a | 262 | static inline void ledtrig_ide_activity(void) {} |
2bfb646c RP |
263 | #endif |
264 | ||
48a1d032 KM |
265 | #if defined(CONFIG_LEDS_TRIGGER_CAMERA) || defined(CONFIG_LEDS_TRIGGER_CAMERA_MODULE) |
266 | extern void ledtrig_flash_ctrl(bool on); | |
267 | extern void ledtrig_torch_ctrl(bool on); | |
268 | #else | |
269 | static inline void ledtrig_flash_ctrl(bool on) {} | |
270 | static inline void ledtrig_torch_ctrl(bool on) {} | |
271 | #endif | |
272 | ||
f46e9203 NC |
273 | /* |
274 | * Generic LED platform data for describing LED names and default triggers. | |
275 | */ | |
276 | struct led_info { | |
277 | const char *name; | |
326bb8a5 | 278 | const char *default_trigger; |
f46e9203 NC |
279 | int flags; |
280 | }; | |
281 | ||
282 | struct led_platform_data { | |
283 | int num_leds; | |
284 | struct led_info *leds; | |
285 | }; | |
286 | ||
22e03f3b RA |
287 | /* For the leds-gpio driver */ |
288 | struct gpio_led { | |
289 | const char *name; | |
326bb8a5 | 290 | const char *default_trigger; |
22e03f3b | 291 | unsigned gpio; |
ed88bae6 TP |
292 | unsigned active_low : 1; |
293 | unsigned retain_state_suspended : 1; | |
294 | unsigned default_state : 2; | |
295 | /* default_state should be one of LEDS_GPIO_DEFSTATE_(ON|OFF|KEEP) */ | |
22e03f3b | 296 | }; |
2146325d BH |
297 | #define LEDS_GPIO_DEFSTATE_OFF 0 |
298 | #define LEDS_GPIO_DEFSTATE_ON 1 | |
299 | #define LEDS_GPIO_DEFSTATE_KEEP 2 | |
22e03f3b RA |
300 | |
301 | struct gpio_led_platform_data { | |
302 | int num_leds; | |
9517f925 | 303 | const struct gpio_led *leds; |
2146325d BH |
304 | |
305 | #define GPIO_LED_NO_BLINK_LOW 0 /* No blink GPIO state low */ | |
306 | #define GPIO_LED_NO_BLINK_HIGH 1 /* No blink GPIO state high */ | |
9517f925 | 307 | #define GPIO_LED_BLINK 2 /* Please, blink */ |
2146325d | 308 | int (*gpio_blink_set)(unsigned gpio, int state, |
ca3259b3 HVR |
309 | unsigned long *delay_on, |
310 | unsigned long *delay_off); | |
22e03f3b RA |
311 | }; |
312 | ||
4440673a UKK |
313 | struct platform_device *gpio_led_register_device( |
314 | int id, const struct gpio_led_platform_data *pdata); | |
22e03f3b | 315 | |
8f88731d BW |
316 | enum cpu_led_event { |
317 | CPU_LED_IDLE_START, /* CPU enters idle */ | |
318 | CPU_LED_IDLE_END, /* CPU idle ends */ | |
319 | CPU_LED_START, /* Machine starts, especially resume */ | |
320 | CPU_LED_STOP, /* Machine stops, especially suspend */ | |
321 | CPU_LED_HALTED, /* Machine shutdown */ | |
322 | }; | |
323 | #ifdef CONFIG_LEDS_TRIGGER_CPU | |
324 | extern void ledtrig_cpu(enum cpu_led_event evt); | |
325 | #else | |
326 | static inline void ledtrig_cpu(enum cpu_led_event evt) | |
327 | { | |
328 | return; | |
329 | } | |
330 | #endif | |
331 | ||
c72a1d60 | 332 | #endif /* __LINUX_LEDS_H_INCLUDED */ |