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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * LED Triggers Core
4 *
5 * Copyright 2005-2007 Openedhand Ltd.
6 *
7 * Author: Richard Purdie <rpurdie@openedhand.com>
8 */
9
10#include <linux/export.h>
11#include <linux/kernel.h>
12#include <linux/list.h>
13#include <linux/spinlock.h>
14#include <linux/device.h>
15#include <linux/timer.h>
16#include <linux/rwsem.h>
17#include <linux/leds.h>
18#include <linux/slab.h>
19#include <linux/mm.h>
20#include "leds.h"
21
22/*
23 * Nests outside led_cdev->trigger_lock
24 */
25static DECLARE_RWSEM(triggers_list_lock);
26LIST_HEAD(trigger_list);
27
28 /* Used by LED Class */
29
30static inline bool
31trigger_relevant(struct led_classdev *led_cdev, struct led_trigger *trig)
32{
33 return !trig->trigger_type || trig->trigger_type == led_cdev->trigger_type;
34}
35
36ssize_t led_trigger_write(struct file *filp, struct kobject *kobj,
37 struct bin_attribute *bin_attr, char *buf,
38 loff_t pos, size_t count)
39{
40 struct device *dev = kobj_to_dev(kobj);
41 struct led_classdev *led_cdev = dev_get_drvdata(dev);
42 struct led_trigger *trig;
43 int ret = count;
44
45 mutex_lock(&led_cdev->led_access);
46
47 if (led_sysfs_is_disabled(led_cdev)) {
48 ret = -EBUSY;
49 goto unlock;
50 }
51
52 if (sysfs_streq(buf, "none")) {
53 led_trigger_remove(led_cdev);
54 goto unlock;
55 }
56
57 down_read(&triggers_list_lock);
58 list_for_each_entry(trig, &trigger_list, next_trig) {
59 if (sysfs_streq(buf, trig->name) && trigger_relevant(led_cdev, trig)) {
60 down_write(&led_cdev->trigger_lock);
61 led_trigger_set(led_cdev, trig);
62 up_write(&led_cdev->trigger_lock);
63
64 up_read(&triggers_list_lock);
65 goto unlock;
66 }
67 }
68 /* we come here only if buf matches no trigger */
69 ret = -EINVAL;
70 up_read(&triggers_list_lock);
71
72unlock:
73 mutex_unlock(&led_cdev->led_access);
74 return ret;
75}
76EXPORT_SYMBOL_GPL(led_trigger_write);
77
78__printf(3, 4)
79static int led_trigger_snprintf(char *buf, ssize_t size, const char *fmt, ...)
80{
81 va_list args;
82 int i;
83
84 va_start(args, fmt);
85 if (size <= 0)
86 i = vsnprintf(NULL, 0, fmt, args);
87 else
88 i = vscnprintf(buf, size, fmt, args);
89 va_end(args);
90
91 return i;
92}
93
94static int led_trigger_format(char *buf, size_t size,
95 struct led_classdev *led_cdev)
96{
97 struct led_trigger *trig;
98 int len = led_trigger_snprintf(buf, size, "%s",
99 led_cdev->trigger ? "none" : "[none]");
100
101 list_for_each_entry(trig, &trigger_list, next_trig) {
102 bool hit;
103
104 if (!trigger_relevant(led_cdev, trig))
105 continue;
106
107 hit = led_cdev->trigger && !strcmp(led_cdev->trigger->name, trig->name);
108
109 len += led_trigger_snprintf(buf + len, size - len,
110 " %s%s%s", hit ? "[" : "",
111 trig->name, hit ? "]" : "");
112 }
113
114 len += led_trigger_snprintf(buf + len, size - len, "\n");
115
116 return len;
117}
118
119/*
120 * It was stupid to create 10000 cpu triggers, but we are stuck with it now.
121 * Don't make that mistake again. We work around it here by creating binary
122 * attribute, which is not limited by length. This is _not_ good design, do not
123 * copy it.
124 */
125ssize_t led_trigger_read(struct file *filp, struct kobject *kobj,
126 struct bin_attribute *attr, char *buf,
127 loff_t pos, size_t count)
128{
129 struct device *dev = kobj_to_dev(kobj);
130 struct led_classdev *led_cdev = dev_get_drvdata(dev);
131 void *data;
132 int len;
133
134 down_read(&triggers_list_lock);
135 down_read(&led_cdev->trigger_lock);
136
137 len = led_trigger_format(NULL, 0, led_cdev);
138 data = kvmalloc(len + 1, GFP_KERNEL);
139 if (!data) {
140 up_read(&led_cdev->trigger_lock);
141 up_read(&triggers_list_lock);
142 return -ENOMEM;
143 }
144 len = led_trigger_format(data, len + 1, led_cdev);
145
146 up_read(&led_cdev->trigger_lock);
147 up_read(&triggers_list_lock);
148
149 len = memory_read_from_buffer(buf, count, &pos, data, len);
150
151 kvfree(data);
152
153 return len;
154}
155EXPORT_SYMBOL_GPL(led_trigger_read);
156
157/* Caller must ensure led_cdev->trigger_lock held */
158int led_trigger_set(struct led_classdev *led_cdev, struct led_trigger *trig)
159{
160 char *event = NULL;
161 char *envp[2];
162 const char *name;
163 int ret;
164
165 if (!led_cdev->trigger && !trig)
166 return 0;
167
168 name = trig ? trig->name : "none";
169 event = kasprintf(GFP_KERNEL, "TRIGGER=%s", name);
170
171 /* Remove any existing trigger */
172 if (led_cdev->trigger) {
173 spin_lock(&led_cdev->trigger->leddev_list_lock);
174 list_del_rcu(&led_cdev->trig_list);
175 spin_unlock(&led_cdev->trigger->leddev_list_lock);
176
177 /* ensure it's no longer visible on the led_cdevs list */
178 synchronize_rcu();
179
180 cancel_work_sync(&led_cdev->set_brightness_work);
181 led_stop_software_blink(led_cdev);
182 if (led_cdev->trigger->deactivate)
183 led_cdev->trigger->deactivate(led_cdev);
184 device_remove_groups(led_cdev->dev, led_cdev->trigger->groups);
185 led_cdev->trigger = NULL;
186 led_cdev->trigger_data = NULL;
187 led_cdev->activated = false;
188 led_set_brightness(led_cdev, LED_OFF);
189 }
190 if (trig) {
191 spin_lock(&trig->leddev_list_lock);
192 list_add_tail_rcu(&led_cdev->trig_list, &trig->led_cdevs);
193 spin_unlock(&trig->leddev_list_lock);
194 led_cdev->trigger = trig;
195
196 if (trig->activate)
197 ret = trig->activate(led_cdev);
198 else
199 ret = 0;
200
201 if (ret)
202 goto err_activate;
203
204 ret = device_add_groups(led_cdev->dev, trig->groups);
205 if (ret) {
206 dev_err(led_cdev->dev, "Failed to add trigger attributes\n");
207 goto err_add_groups;
208 }
209 }
210
211 if (event) {
212 envp[0] = event;
213 envp[1] = NULL;
214 if (kobject_uevent_env(&led_cdev->dev->kobj, KOBJ_CHANGE, envp))
215 dev_err(led_cdev->dev,
216 "%s: Error sending uevent\n", __func__);
217 kfree(event);
218 }
219
220 return 0;
221
222err_add_groups:
223
224 if (trig->deactivate)
225 trig->deactivate(led_cdev);
226err_activate:
227
228 spin_lock(&led_cdev->trigger->leddev_list_lock);
229 list_del_rcu(&led_cdev->trig_list);
230 spin_unlock(&led_cdev->trigger->leddev_list_lock);
231 synchronize_rcu();
232 led_cdev->trigger = NULL;
233 led_cdev->trigger_data = NULL;
234 led_set_brightness(led_cdev, LED_OFF);
235 kfree(event);
236
237 return ret;
238}
239EXPORT_SYMBOL_GPL(led_trigger_set);
240
241void led_trigger_remove(struct led_classdev *led_cdev)
242{
243 down_write(&led_cdev->trigger_lock);
244 led_trigger_set(led_cdev, NULL);
245 up_write(&led_cdev->trigger_lock);
246}
247EXPORT_SYMBOL_GPL(led_trigger_remove);
248
249void led_trigger_set_default(struct led_classdev *led_cdev)
250{
251 struct led_trigger *trig;
252
253 if (!led_cdev->default_trigger)
254 return;
255
256 down_read(&triggers_list_lock);
257 down_write(&led_cdev->trigger_lock);
258 list_for_each_entry(trig, &trigger_list, next_trig) {
259 if (!strcmp(led_cdev->default_trigger, trig->name) &&
260 trigger_relevant(led_cdev, trig)) {
261 led_cdev->flags |= LED_INIT_DEFAULT_TRIGGER;
262 led_trigger_set(led_cdev, trig);
263 break;
264 }
265 }
266 up_write(&led_cdev->trigger_lock);
267 up_read(&triggers_list_lock);
268}
269EXPORT_SYMBOL_GPL(led_trigger_set_default);
270
271void led_trigger_rename_static(const char *name, struct led_trigger *trig)
272{
273 /* new name must be on a temporary string to prevent races */
274 BUG_ON(name == trig->name);
275
276 down_write(&triggers_list_lock);
277 /* this assumes that trig->name was originaly allocated to
278 * non constant storage */
279 strcpy((char *)trig->name, name);
280 up_write(&triggers_list_lock);
281}
282EXPORT_SYMBOL_GPL(led_trigger_rename_static);
283
284/* LED Trigger Interface */
285
286int led_trigger_register(struct led_trigger *trig)
287{
288 struct led_classdev *led_cdev;
289 struct led_trigger *_trig;
290
291 spin_lock_init(&trig->leddev_list_lock);
292 INIT_LIST_HEAD(&trig->led_cdevs);
293
294 down_write(&triggers_list_lock);
295 /* Make sure the trigger's name isn't already in use */
296 list_for_each_entry(_trig, &trigger_list, next_trig) {
297 if (!strcmp(_trig->name, trig->name) &&
298 (trig->trigger_type == _trig->trigger_type ||
299 !trig->trigger_type || !_trig->trigger_type)) {
300 up_write(&triggers_list_lock);
301 return -EEXIST;
302 }
303 }
304 /* Add to the list of led triggers */
305 list_add_tail(&trig->next_trig, &trigger_list);
306 up_write(&triggers_list_lock);
307
308 /* Register with any LEDs that have this as a default trigger */
309 down_read(&leds_list_lock);
310 list_for_each_entry(led_cdev, &leds_list, node) {
311 down_write(&led_cdev->trigger_lock);
312 if (!led_cdev->trigger && led_cdev->default_trigger &&
313 !strcmp(led_cdev->default_trigger, trig->name) &&
314 trigger_relevant(led_cdev, trig)) {
315 led_cdev->flags |= LED_INIT_DEFAULT_TRIGGER;
316 led_trigger_set(led_cdev, trig);
317 }
318 up_write(&led_cdev->trigger_lock);
319 }
320 up_read(&leds_list_lock);
321
322 return 0;
323}
324EXPORT_SYMBOL_GPL(led_trigger_register);
325
326void led_trigger_unregister(struct led_trigger *trig)
327{
328 struct led_classdev *led_cdev;
329
330 if (list_empty_careful(&trig->next_trig))
331 return;
332
333 /* Remove from the list of led triggers */
334 down_write(&triggers_list_lock);
335 list_del_init(&trig->next_trig);
336 up_write(&triggers_list_lock);
337
338 /* Remove anyone actively using this trigger */
339 down_read(&leds_list_lock);
340 list_for_each_entry(led_cdev, &leds_list, node) {
341 down_write(&led_cdev->trigger_lock);
342 if (led_cdev->trigger == trig)
343 led_trigger_set(led_cdev, NULL);
344 up_write(&led_cdev->trigger_lock);
345 }
346 up_read(&leds_list_lock);
347}
348EXPORT_SYMBOL_GPL(led_trigger_unregister);
349
350static void devm_led_trigger_release(struct device *dev, void *res)
351{
352 led_trigger_unregister(*(struct led_trigger **)res);
353}
354
355int devm_led_trigger_register(struct device *dev,
356 struct led_trigger *trig)
357{
358 struct led_trigger **dr;
359 int rc;
360
361 dr = devres_alloc(devm_led_trigger_release, sizeof(*dr),
362 GFP_KERNEL);
363 if (!dr)
364 return -ENOMEM;
365
366 *dr = trig;
367
368 rc = led_trigger_register(trig);
369 if (rc)
370 devres_free(dr);
371 else
372 devres_add(dev, dr);
373
374 return rc;
375}
376EXPORT_SYMBOL_GPL(devm_led_trigger_register);
377
378/* Simple LED Trigger Interface */
379
380void led_trigger_event(struct led_trigger *trig,
381 enum led_brightness brightness)
382{
383 struct led_classdev *led_cdev;
384
385 if (!trig)
386 return;
387
388 rcu_read_lock();
389 list_for_each_entry_rcu(led_cdev, &trig->led_cdevs, trig_list)
390 led_set_brightness(led_cdev, brightness);
391 rcu_read_unlock();
392}
393EXPORT_SYMBOL_GPL(led_trigger_event);
394
395static void led_trigger_blink_setup(struct led_trigger *trig,
396 unsigned long *delay_on,
397 unsigned long *delay_off,
398 int oneshot,
399 int invert)
400{
401 struct led_classdev *led_cdev;
402
403 if (!trig)
404 return;
405
406 rcu_read_lock();
407 list_for_each_entry_rcu(led_cdev, &trig->led_cdevs, trig_list) {
408 if (oneshot)
409 led_blink_set_oneshot(led_cdev, delay_on, delay_off,
410 invert);
411 else
412 led_blink_set(led_cdev, delay_on, delay_off);
413 }
414 rcu_read_unlock();
415}
416
417void led_trigger_blink(struct led_trigger *trig,
418 unsigned long *delay_on,
419 unsigned long *delay_off)
420{
421 led_trigger_blink_setup(trig, delay_on, delay_off, 0, 0);
422}
423EXPORT_SYMBOL_GPL(led_trigger_blink);
424
425void led_trigger_blink_oneshot(struct led_trigger *trig,
426 unsigned long *delay_on,
427 unsigned long *delay_off,
428 int invert)
429{
430 led_trigger_blink_setup(trig, delay_on, delay_off, 1, invert);
431}
432EXPORT_SYMBOL_GPL(led_trigger_blink_oneshot);
433
434void led_trigger_register_simple(const char *name, struct led_trigger **tp)
435{
436 struct led_trigger *trig;
437 int err;
438
439 trig = kzalloc(sizeof(struct led_trigger), GFP_KERNEL);
440
441 if (trig) {
442 trig->name = name;
443 err = led_trigger_register(trig);
444 if (err < 0) {
445 kfree(trig);
446 trig = NULL;
447 pr_warn("LED trigger %s failed to register (%d)\n",
448 name, err);
449 }
450 } else {
451 pr_warn("LED trigger %s failed to register (no memory)\n",
452 name);
453 }
454 *tp = trig;
455}
456EXPORT_SYMBOL_GPL(led_trigger_register_simple);
457
458void led_trigger_unregister_simple(struct led_trigger *trig)
459{
460 if (trig)
461 led_trigger_unregister(trig);
462 kfree(trig);
463}
464EXPORT_SYMBOL_GPL(led_trigger_unregister_simple);
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * LED Triggers Core
4 *
5 * Copyright 2005-2007 Openedhand Ltd.
6 *
7 * Author: Richard Purdie <rpurdie@openedhand.com>
8 */
9
10#include <linux/export.h>
11#include <linux/kernel.h>
12#include <linux/list.h>
13#include <linux/spinlock.h>
14#include <linux/device.h>
15#include <linux/timer.h>
16#include <linux/rwsem.h>
17#include <linux/leds.h>
18#include <linux/slab.h>
19#include "leds.h"
20
21/*
22 * Nests outside led_cdev->trigger_lock
23 */
24static DECLARE_RWSEM(triggers_list_lock);
25LIST_HEAD(trigger_list);
26
27 /* Used by LED Class */
28
29ssize_t led_trigger_store(struct device *dev, struct device_attribute *attr,
30 const char *buf, size_t count)
31{
32 struct led_classdev *led_cdev = dev_get_drvdata(dev);
33 struct led_trigger *trig;
34 int ret = count;
35
36 mutex_lock(&led_cdev->led_access);
37
38 if (led_sysfs_is_disabled(led_cdev)) {
39 ret = -EBUSY;
40 goto unlock;
41 }
42
43 if (sysfs_streq(buf, "none")) {
44 led_trigger_remove(led_cdev);
45 goto unlock;
46 }
47
48 down_read(&triggers_list_lock);
49 list_for_each_entry(trig, &trigger_list, next_trig) {
50 if (sysfs_streq(buf, trig->name)) {
51 down_write(&led_cdev->trigger_lock);
52 led_trigger_set(led_cdev, trig);
53 up_write(&led_cdev->trigger_lock);
54
55 up_read(&triggers_list_lock);
56 goto unlock;
57 }
58 }
59 /* we come here only if buf matches no trigger */
60 ret = -EINVAL;
61 up_read(&triggers_list_lock);
62
63unlock:
64 mutex_unlock(&led_cdev->led_access);
65 return ret;
66}
67EXPORT_SYMBOL_GPL(led_trigger_store);
68
69ssize_t led_trigger_show(struct device *dev, struct device_attribute *attr,
70 char *buf)
71{
72 struct led_classdev *led_cdev = dev_get_drvdata(dev);
73 struct led_trigger *trig;
74 int len = 0;
75
76 down_read(&triggers_list_lock);
77 down_read(&led_cdev->trigger_lock);
78
79 if (!led_cdev->trigger)
80 len += scnprintf(buf+len, PAGE_SIZE - len, "[none] ");
81 else
82 len += scnprintf(buf+len, PAGE_SIZE - len, "none ");
83
84 list_for_each_entry(trig, &trigger_list, next_trig) {
85 if (led_cdev->trigger && !strcmp(led_cdev->trigger->name,
86 trig->name))
87 len += scnprintf(buf+len, PAGE_SIZE - len, "[%s] ",
88 trig->name);
89 else
90 len += scnprintf(buf+len, PAGE_SIZE - len, "%s ",
91 trig->name);
92 }
93 up_read(&led_cdev->trigger_lock);
94 up_read(&triggers_list_lock);
95
96 len += scnprintf(len+buf, PAGE_SIZE - len, "\n");
97 return len;
98}
99EXPORT_SYMBOL_GPL(led_trigger_show);
100
101/* Caller must ensure led_cdev->trigger_lock held */
102int led_trigger_set(struct led_classdev *led_cdev, struct led_trigger *trig)
103{
104 unsigned long flags;
105 char *event = NULL;
106 char *envp[2];
107 const char *name;
108 int ret;
109
110 if (!led_cdev->trigger && !trig)
111 return 0;
112
113 name = trig ? trig->name : "none";
114 event = kasprintf(GFP_KERNEL, "TRIGGER=%s", name);
115
116 /* Remove any existing trigger */
117 if (led_cdev->trigger) {
118 write_lock_irqsave(&led_cdev->trigger->leddev_list_lock, flags);
119 list_del(&led_cdev->trig_list);
120 write_unlock_irqrestore(&led_cdev->trigger->leddev_list_lock,
121 flags);
122 cancel_work_sync(&led_cdev->set_brightness_work);
123 led_stop_software_blink(led_cdev);
124 if (led_cdev->trigger->deactivate)
125 led_cdev->trigger->deactivate(led_cdev);
126 device_remove_groups(led_cdev->dev, led_cdev->trigger->groups);
127 led_cdev->trigger = NULL;
128 led_cdev->trigger_data = NULL;
129 led_cdev->activated = false;
130 led_set_brightness(led_cdev, LED_OFF);
131 }
132 if (trig) {
133 write_lock_irqsave(&trig->leddev_list_lock, flags);
134 list_add_tail(&led_cdev->trig_list, &trig->led_cdevs);
135 write_unlock_irqrestore(&trig->leddev_list_lock, flags);
136 led_cdev->trigger = trig;
137
138 if (trig->activate)
139 ret = trig->activate(led_cdev);
140 else
141 ret = 0;
142
143 if (ret)
144 goto err_activate;
145
146 ret = device_add_groups(led_cdev->dev, trig->groups);
147 if (ret) {
148 dev_err(led_cdev->dev, "Failed to add trigger attributes\n");
149 goto err_add_groups;
150 }
151 }
152
153 if (event) {
154 envp[0] = event;
155 envp[1] = NULL;
156 if (kobject_uevent_env(&led_cdev->dev->kobj, KOBJ_CHANGE, envp))
157 dev_err(led_cdev->dev,
158 "%s: Error sending uevent\n", __func__);
159 kfree(event);
160 }
161
162 return 0;
163
164err_add_groups:
165
166 if (trig->deactivate)
167 trig->deactivate(led_cdev);
168err_activate:
169
170 write_lock_irqsave(&led_cdev->trigger->leddev_list_lock, flags);
171 list_del(&led_cdev->trig_list);
172 write_unlock_irqrestore(&led_cdev->trigger->leddev_list_lock, flags);
173 led_cdev->trigger = NULL;
174 led_cdev->trigger_data = NULL;
175 led_set_brightness(led_cdev, LED_OFF);
176 kfree(event);
177
178 return ret;
179}
180EXPORT_SYMBOL_GPL(led_trigger_set);
181
182void led_trigger_remove(struct led_classdev *led_cdev)
183{
184 down_write(&led_cdev->trigger_lock);
185 led_trigger_set(led_cdev, NULL);
186 up_write(&led_cdev->trigger_lock);
187}
188EXPORT_SYMBOL_GPL(led_trigger_remove);
189
190void led_trigger_set_default(struct led_classdev *led_cdev)
191{
192 struct led_trigger *trig;
193
194 if (!led_cdev->default_trigger)
195 return;
196
197 down_read(&triggers_list_lock);
198 down_write(&led_cdev->trigger_lock);
199 list_for_each_entry(trig, &trigger_list, next_trig) {
200 if (!strcmp(led_cdev->default_trigger, trig->name)) {
201 led_cdev->flags |= LED_INIT_DEFAULT_TRIGGER;
202 led_trigger_set(led_cdev, trig);
203 break;
204 }
205 }
206 up_write(&led_cdev->trigger_lock);
207 up_read(&triggers_list_lock);
208}
209EXPORT_SYMBOL_GPL(led_trigger_set_default);
210
211void led_trigger_rename_static(const char *name, struct led_trigger *trig)
212{
213 /* new name must be on a temporary string to prevent races */
214 BUG_ON(name == trig->name);
215
216 down_write(&triggers_list_lock);
217 /* this assumes that trig->name was originaly allocated to
218 * non constant storage */
219 strcpy((char *)trig->name, name);
220 up_write(&triggers_list_lock);
221}
222EXPORT_SYMBOL_GPL(led_trigger_rename_static);
223
224/* LED Trigger Interface */
225
226int led_trigger_register(struct led_trigger *trig)
227{
228 struct led_classdev *led_cdev;
229 struct led_trigger *_trig;
230
231 rwlock_init(&trig->leddev_list_lock);
232 INIT_LIST_HEAD(&trig->led_cdevs);
233
234 down_write(&triggers_list_lock);
235 /* Make sure the trigger's name isn't already in use */
236 list_for_each_entry(_trig, &trigger_list, next_trig) {
237 if (!strcmp(_trig->name, trig->name)) {
238 up_write(&triggers_list_lock);
239 return -EEXIST;
240 }
241 }
242 /* Add to the list of led triggers */
243 list_add_tail(&trig->next_trig, &trigger_list);
244 up_write(&triggers_list_lock);
245
246 /* Register with any LEDs that have this as a default trigger */
247 down_read(&leds_list_lock);
248 list_for_each_entry(led_cdev, &leds_list, node) {
249 down_write(&led_cdev->trigger_lock);
250 if (!led_cdev->trigger && led_cdev->default_trigger &&
251 !strcmp(led_cdev->default_trigger, trig->name)) {
252 led_cdev->flags |= LED_INIT_DEFAULT_TRIGGER;
253 led_trigger_set(led_cdev, trig);
254 }
255 up_write(&led_cdev->trigger_lock);
256 }
257 up_read(&leds_list_lock);
258
259 return 0;
260}
261EXPORT_SYMBOL_GPL(led_trigger_register);
262
263void led_trigger_unregister(struct led_trigger *trig)
264{
265 struct led_classdev *led_cdev;
266
267 if (list_empty_careful(&trig->next_trig))
268 return;
269
270 /* Remove from the list of led triggers */
271 down_write(&triggers_list_lock);
272 list_del_init(&trig->next_trig);
273 up_write(&triggers_list_lock);
274
275 /* Remove anyone actively using this trigger */
276 down_read(&leds_list_lock);
277 list_for_each_entry(led_cdev, &leds_list, node) {
278 down_write(&led_cdev->trigger_lock);
279 if (led_cdev->trigger == trig)
280 led_trigger_set(led_cdev, NULL);
281 up_write(&led_cdev->trigger_lock);
282 }
283 up_read(&leds_list_lock);
284}
285EXPORT_SYMBOL_GPL(led_trigger_unregister);
286
287static void devm_led_trigger_release(struct device *dev, void *res)
288{
289 led_trigger_unregister(*(struct led_trigger **)res);
290}
291
292int devm_led_trigger_register(struct device *dev,
293 struct led_trigger *trig)
294{
295 struct led_trigger **dr;
296 int rc;
297
298 dr = devres_alloc(devm_led_trigger_release, sizeof(*dr),
299 GFP_KERNEL);
300 if (!dr)
301 return -ENOMEM;
302
303 *dr = trig;
304
305 rc = led_trigger_register(trig);
306 if (rc)
307 devres_free(dr);
308 else
309 devres_add(dev, dr);
310
311 return rc;
312}
313EXPORT_SYMBOL_GPL(devm_led_trigger_register);
314
315/* Simple LED Tigger Interface */
316
317void led_trigger_event(struct led_trigger *trig,
318 enum led_brightness brightness)
319{
320 struct led_classdev *led_cdev;
321
322 if (!trig)
323 return;
324
325 read_lock(&trig->leddev_list_lock);
326 list_for_each_entry(led_cdev, &trig->led_cdevs, trig_list)
327 led_set_brightness(led_cdev, brightness);
328 read_unlock(&trig->leddev_list_lock);
329}
330EXPORT_SYMBOL_GPL(led_trigger_event);
331
332static void led_trigger_blink_setup(struct led_trigger *trig,
333 unsigned long *delay_on,
334 unsigned long *delay_off,
335 int oneshot,
336 int invert)
337{
338 struct led_classdev *led_cdev;
339
340 if (!trig)
341 return;
342
343 read_lock(&trig->leddev_list_lock);
344 list_for_each_entry(led_cdev, &trig->led_cdevs, trig_list) {
345 if (oneshot)
346 led_blink_set_oneshot(led_cdev, delay_on, delay_off,
347 invert);
348 else
349 led_blink_set(led_cdev, delay_on, delay_off);
350 }
351 read_unlock(&trig->leddev_list_lock);
352}
353
354void led_trigger_blink(struct led_trigger *trig,
355 unsigned long *delay_on,
356 unsigned long *delay_off)
357{
358 led_trigger_blink_setup(trig, delay_on, delay_off, 0, 0);
359}
360EXPORT_SYMBOL_GPL(led_trigger_blink);
361
362void led_trigger_blink_oneshot(struct led_trigger *trig,
363 unsigned long *delay_on,
364 unsigned long *delay_off,
365 int invert)
366{
367 led_trigger_blink_setup(trig, delay_on, delay_off, 1, invert);
368}
369EXPORT_SYMBOL_GPL(led_trigger_blink_oneshot);
370
371void led_trigger_register_simple(const char *name, struct led_trigger **tp)
372{
373 struct led_trigger *trig;
374 int err;
375
376 trig = kzalloc(sizeof(struct led_trigger), GFP_KERNEL);
377
378 if (trig) {
379 trig->name = name;
380 err = led_trigger_register(trig);
381 if (err < 0) {
382 kfree(trig);
383 trig = NULL;
384 pr_warn("LED trigger %s failed to register (%d)\n",
385 name, err);
386 }
387 } else {
388 pr_warn("LED trigger %s failed to register (no memory)\n",
389 name);
390 }
391 *tp = trig;
392}
393EXPORT_SYMBOL_GPL(led_trigger_register_simple);
394
395void led_trigger_unregister_simple(struct led_trigger *trig)
396{
397 if (trig)
398 led_trigger_unregister(trig);
399 kfree(trig);
400}
401EXPORT_SYMBOL_GPL(led_trigger_unregister_simple);