]>
Commit | Line | Data |
---|---|---|
d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
c3bc9956 RP |
2 | /* |
3 | * LED Triggers Core | |
4 | * | |
f8a7c6fe | 5 | * Copyright 2005-2007 Openedhand Ltd. |
c3bc9956 RP |
6 | * |
7 | * Author: Richard Purdie <rpurdie@openedhand.com> | |
c3bc9956 RP |
8 | */ |
9 | ||
50237863 | 10 | #include <linux/export.h> |
c3bc9956 | 11 | #include <linux/kernel.h> |
c3bc9956 RP |
12 | #include <linux/list.h> |
13 | #include <linux/spinlock.h> | |
14 | #include <linux/device.h> | |
c3bc9956 | 15 | #include <linux/timer.h> |
dc47206e | 16 | #include <linux/rwsem.h> |
c3bc9956 | 17 | #include <linux/leds.h> |
5a0e3ad6 | 18 | #include <linux/slab.h> |
c3bc9956 RP |
19 | #include "leds.h" |
20 | ||
21 | /* | |
22 | * Nests outside led_cdev->trigger_lock | |
23 | */ | |
dc47206e | 24 | static DECLARE_RWSEM(triggers_list_lock); |
ba93cdce | 25 | LIST_HEAD(trigger_list); |
c3bc9956 | 26 | |
4d404fd5 NM |
27 | /* Used by LED Class */ |
28 | ||
f8a7c6fe RP |
29 | ssize_t led_trigger_store(struct device *dev, struct device_attribute *attr, |
30 | const char *buf, size_t count) | |
c3bc9956 | 31 | { |
f8a7c6fe | 32 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
c3bc9956 | 33 | struct led_trigger *trig; |
acd899e4 JA |
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 | } | |
c3bc9956 | 42 | |
7296c33e | 43 | if (sysfs_streq(buf, "none")) { |
0013b23d | 44 | led_trigger_remove(led_cdev); |
acd899e4 | 45 | goto unlock; |
c3bc9956 RP |
46 | } |
47 | ||
dc47206e | 48 | down_read(&triggers_list_lock); |
c3bc9956 | 49 | list_for_each_entry(trig, &trigger_list, next_trig) { |
7296c33e | 50 | if (sysfs_streq(buf, trig->name)) { |
dc47206e | 51 | down_write(&led_cdev->trigger_lock); |
c3bc9956 | 52 | led_trigger_set(led_cdev, trig); |
dc47206e | 53 | up_write(&led_cdev->trigger_lock); |
c3bc9956 | 54 | |
dc47206e | 55 | up_read(&triggers_list_lock); |
acd899e4 | 56 | goto unlock; |
c3bc9956 RP |
57 | } |
58 | } | |
a3eac76c HK |
59 | /* we come here only if buf matches no trigger */ |
60 | ret = -EINVAL; | |
dc47206e | 61 | up_read(&triggers_list_lock); |
c3bc9956 | 62 | |
acd899e4 JA |
63 | unlock: |
64 | mutex_unlock(&led_cdev->led_access); | |
65 | return ret; | |
c3bc9956 | 66 | } |
4d404fd5 | 67 | EXPORT_SYMBOL_GPL(led_trigger_store); |
c3bc9956 | 68 | |
f8a7c6fe RP |
69 | ssize_t led_trigger_show(struct device *dev, struct device_attribute *attr, |
70 | char *buf) | |
c3bc9956 | 71 | { |
f8a7c6fe | 72 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
c3bc9956 RP |
73 | struct led_trigger *trig; |
74 | int len = 0; | |
75 | ||
dc47206e RP |
76 | down_read(&triggers_list_lock); |
77 | down_read(&led_cdev->trigger_lock); | |
c3bc9956 RP |
78 | |
79 | if (!led_cdev->trigger) | |
3b9b9536 | 80 | len += scnprintf(buf+len, PAGE_SIZE - len, "[none] "); |
c3bc9956 | 81 | else |
3b9b9536 | 82 | len += scnprintf(buf+len, PAGE_SIZE - len, "none "); |
c3bc9956 RP |
83 | |
84 | list_for_each_entry(trig, &trigger_list, next_trig) { | |
85 | if (led_cdev->trigger && !strcmp(led_cdev->trigger->name, | |
86 | trig->name)) | |
3b9b9536 NS |
87 | len += scnprintf(buf+len, PAGE_SIZE - len, "[%s] ", |
88 | trig->name); | |
c3bc9956 | 89 | else |
3b9b9536 NS |
90 | len += scnprintf(buf+len, PAGE_SIZE - len, "%s ", |
91 | trig->name); | |
c3bc9956 | 92 | } |
dc47206e RP |
93 | up_read(&led_cdev->trigger_lock); |
94 | up_read(&triggers_list_lock); | |
c3bc9956 | 95 | |
3b9b9536 | 96 | len += scnprintf(len+buf, PAGE_SIZE - len, "\n"); |
c3bc9956 RP |
97 | return len; |
98 | } | |
4d404fd5 | 99 | EXPORT_SYMBOL_GPL(led_trigger_show); |
c3bc9956 RP |
100 | |
101 | /* Caller must ensure led_cdev->trigger_lock held */ | |
2282e125 | 102 | int led_trigger_set(struct led_classdev *led_cdev, struct led_trigger *trig) |
c3bc9956 RP |
103 | { |
104 | unsigned long flags; | |
52c47742 CC |
105 | char *event = NULL; |
106 | char *envp[2]; | |
107 | const char *name; | |
2282e125 | 108 | int ret; |
52c47742 | 109 | |
fbfa197a | 110 | if (!led_cdev->trigger && !trig) |
2282e125 | 111 | return 0; |
fbfa197a | 112 | |
52c47742 CC |
113 | name = trig ? trig->name : "none"; |
114 | event = kasprintf(GFP_KERNEL, "TRIGGER=%s", name); | |
c3bc9956 RP |
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); | |
4d404fd5 NM |
120 | write_unlock_irqrestore(&led_cdev->trigger->leddev_list_lock, |
121 | flags); | |
d23a22a7 FB |
122 | cancel_work_sync(&led_cdev->set_brightness_work); |
123 | led_stop_software_blink(led_cdev); | |
c3bc9956 RP |
124 | if (led_cdev->trigger->deactivate) |
125 | led_cdev->trigger->deactivate(led_cdev); | |
a7e7a315 | 126 | device_remove_groups(led_cdev->dev, led_cdev->trigger->groups); |
fe3025b5 | 127 | led_cdev->trigger = NULL; |
a7d5904a UKK |
128 | led_cdev->trigger_data = NULL; |
129 | led_cdev->activated = false; | |
19cd67e2 | 130 | led_set_brightness(led_cdev, LED_OFF); |
c3bc9956 | 131 | } |
eb202621 BW |
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; | |
2282e125 | 137 | |
eb202621 | 138 | if (trig->activate) |
2282e125 UKK |
139 | ret = trig->activate(led_cdev); |
140 | else | |
141 | ret = 0; | |
142 | ||
143 | if (ret) | |
144 | goto err_activate; | |
a7e7a315 UKK |
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 | } | |
c3bc9956 | 151 | } |
52c47742 CC |
152 | |
153 | if (event) { | |
154 | envp[0] = event; | |
155 | envp[1] = NULL; | |
6f3bad96 JA |
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__); | |
52c47742 CC |
159 | kfree(event); |
160 | } | |
2282e125 UKK |
161 | |
162 | return 0; | |
163 | ||
a7e7a315 UKK |
164 | err_add_groups: |
165 | ||
166 | if (trig->deactivate) | |
167 | trig->deactivate(led_cdev); | |
2282e125 | 168 | err_activate: |
a7e7a315 | 169 | |
2282e125 | 170 | led_cdev->trigger = NULL; |
a7d5904a | 171 | led_cdev->trigger_data = NULL; |
2282e125 UKK |
172 | write_lock_irqsave(&led_cdev->trigger->leddev_list_lock, flags); |
173 | list_del(&led_cdev->trig_list); | |
174 | write_unlock_irqrestore(&led_cdev->trigger->leddev_list_lock, flags); | |
175 | led_set_brightness(led_cdev, LED_OFF); | |
53dd1d23 | 176 | kfree(event); |
2282e125 UKK |
177 | |
178 | return ret; | |
c3bc9956 | 179 | } |
4d404fd5 | 180 | EXPORT_SYMBOL_GPL(led_trigger_set); |
c3bc9956 | 181 | |
0013b23d NM |
182 | void 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 | } | |
4d404fd5 | 188 | EXPORT_SYMBOL_GPL(led_trigger_remove); |
0013b23d | 189 | |
c3bc9956 RP |
190 | void 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 | ||
dc47206e RP |
197 | down_read(&triggers_list_lock); |
198 | down_write(&led_cdev->trigger_lock); | |
c3bc9956 | 199 | list_for_each_entry(trig, &trigger_list, next_trig) { |
c4f7bd4a | 200 | if (!strcmp(led_cdev->default_trigger, trig->name)) { |
02d31765 | 201 | led_cdev->flags |= LED_INIT_DEFAULT_TRIGGER; |
c3bc9956 | 202 | led_trigger_set(led_cdev, trig); |
c4f7bd4a JA |
203 | break; |
204 | } | |
c3bc9956 | 205 | } |
dc47206e RP |
206 | up_write(&led_cdev->trigger_lock); |
207 | up_read(&triggers_list_lock); | |
c3bc9956 | 208 | } |
4d404fd5 NM |
209 | EXPORT_SYMBOL_GPL(led_trigger_set_default); |
210 | ||
a8df7b1a FB |
211 | void 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 | } | |
222 | EXPORT_SYMBOL_GPL(led_trigger_rename_static); | |
223 | ||
4d404fd5 | 224 | /* LED Trigger Interface */ |
c3bc9956 | 225 | |
eb202621 | 226 | int led_trigger_register(struct led_trigger *trig) |
c3bc9956 RP |
227 | { |
228 | struct led_classdev *led_cdev; | |
eb202621 | 229 | struct led_trigger *_trig; |
c3bc9956 | 230 | |
eb202621 BW |
231 | rwlock_init(&trig->leddev_list_lock); |
232 | INIT_LIST_HEAD(&trig->led_cdevs); | |
c3bc9956 | 233 | |
dc47206e | 234 | down_write(&triggers_list_lock); |
700c6ea2 | 235 | /* Make sure the trigger's name isn't already in use */ |
eb202621 BW |
236 | list_for_each_entry(_trig, &trigger_list, next_trig) { |
237 | if (!strcmp(_trig->name, trig->name)) { | |
700c6ea2 AN |
238 | up_write(&triggers_list_lock); |
239 | return -EEXIST; | |
240 | } | |
241 | } | |
242 | /* Add to the list of led triggers */ | |
eb202621 | 243 | list_add_tail(&trig->next_trig, &trigger_list); |
dc47206e | 244 | up_write(&triggers_list_lock); |
c3bc9956 RP |
245 | |
246 | /* Register with any LEDs that have this as a default trigger */ | |
72f8da32 | 247 | down_read(&leds_list_lock); |
c3bc9956 | 248 | list_for_each_entry(led_cdev, &leds_list, node) { |
dc47206e | 249 | down_write(&led_cdev->trigger_lock); |
c3bc9956 | 250 | if (!led_cdev->trigger && led_cdev->default_trigger && |
8146aace KK |
251 | !strcmp(led_cdev->default_trigger, trig->name)) { |
252 | led_cdev->flags |= LED_INIT_DEFAULT_TRIGGER; | |
eb202621 | 253 | led_trigger_set(led_cdev, trig); |
8146aace | 254 | } |
dc47206e | 255 | up_write(&led_cdev->trigger_lock); |
c3bc9956 | 256 | } |
72f8da32 | 257 | up_read(&leds_list_lock); |
c3bc9956 RP |
258 | |
259 | return 0; | |
260 | } | |
4d404fd5 | 261 | EXPORT_SYMBOL_GPL(led_trigger_register); |
c3bc9956 | 262 | |
eb202621 | 263 | void led_trigger_unregister(struct led_trigger *trig) |
c3bc9956 RP |
264 | { |
265 | struct led_classdev *led_cdev; | |
266 | ||
14f5716b SL |
267 | if (list_empty_careful(&trig->next_trig)) |
268 | return; | |
269 | ||
c3bc9956 | 270 | /* Remove from the list of led triggers */ |
dc47206e | 271 | down_write(&triggers_list_lock); |
14f5716b | 272 | list_del_init(&trig->next_trig); |
dc47206e | 273 | up_write(&triggers_list_lock); |
c3bc9956 RP |
274 | |
275 | /* Remove anyone actively using this trigger */ | |
72f8da32 | 276 | down_read(&leds_list_lock); |
c3bc9956 | 277 | list_for_each_entry(led_cdev, &leds_list, node) { |
dc47206e | 278 | down_write(&led_cdev->trigger_lock); |
eb202621 | 279 | if (led_cdev->trigger == trig) |
c3bc9956 | 280 | led_trigger_set(led_cdev, NULL); |
dc47206e | 281 | up_write(&led_cdev->trigger_lock); |
c3bc9956 | 282 | } |
72f8da32 | 283 | up_read(&leds_list_lock); |
c3bc9956 | 284 | } |
4d404fd5 | 285 | EXPORT_SYMBOL_GPL(led_trigger_unregister); |
c3bc9956 | 286 | |
9534cc31 HK |
287 | static void devm_led_trigger_release(struct device *dev, void *res) |
288 | { | |
289 | led_trigger_unregister(*(struct led_trigger **)res); | |
290 | } | |
291 | ||
292 | int 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 | } | |
313 | EXPORT_SYMBOL_GPL(devm_led_trigger_register); | |
314 | ||
4d404fd5 NM |
315 | /* Simple LED Tigger Interface */ |
316 | ||
eb202621 | 317 | void led_trigger_event(struct led_trigger *trig, |
4d404fd5 | 318 | enum led_brightness brightness) |
c3bc9956 | 319 | { |
11e043b5 | 320 | struct led_classdev *led_cdev; |
4d404fd5 | 321 | |
eb202621 | 322 | if (!trig) |
4d404fd5 NM |
323 | return; |
324 | ||
eb202621 | 325 | read_lock(&trig->leddev_list_lock); |
11e043b5 | 326 | list_for_each_entry(led_cdev, &trig->led_cdevs, trig_list) |
d23a22a7 | 327 | led_set_brightness(led_cdev, brightness); |
eb202621 | 328 | read_unlock(&trig->leddev_list_lock); |
c3bc9956 | 329 | } |
4d404fd5 | 330 | EXPORT_SYMBOL_GPL(led_trigger_event); |
c3bc9956 | 331 | |
20c0e6b8 | 332 | static void led_trigger_blink_setup(struct led_trigger *trig, |
5bb629c5 FB |
333 | unsigned long *delay_on, |
334 | unsigned long *delay_off, | |
335 | int oneshot, | |
336 | int invert) | |
0b9536c9 | 337 | { |
11e043b5 | 338 | struct led_classdev *led_cdev; |
0b9536c9 | 339 | |
eb202621 | 340 | if (!trig) |
0b9536c9 VK |
341 | return; |
342 | ||
eb202621 | 343 | read_lock(&trig->leddev_list_lock); |
11e043b5 | 344 | list_for_each_entry(led_cdev, &trig->led_cdevs, trig_list) { |
5bb629c5 FB |
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); | |
0b9536c9 | 350 | } |
eb202621 | 351 | read_unlock(&trig->leddev_list_lock); |
0b9536c9 | 352 | } |
5bb629c5 FB |
353 | |
354 | void 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 | } | |
0b9536c9 VK |
360 | EXPORT_SYMBOL_GPL(led_trigger_blink); |
361 | ||
5bb629c5 FB |
362 | void 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 | } | |
369 | EXPORT_SYMBOL_GPL(led_trigger_blink_oneshot); | |
370 | ||
4d404fd5 NM |
371 | void led_trigger_register_simple(const char *name, struct led_trigger **tp) |
372 | { | |
eb202621 | 373 | struct led_trigger *trig; |
4d404fd5 | 374 | int err; |
c3bc9956 | 375 | |
eb202621 | 376 | trig = kzalloc(sizeof(struct led_trigger), GFP_KERNEL); |
c3bc9956 | 377 | |
eb202621 BW |
378 | if (trig) { |
379 | trig->name = name; | |
380 | err = led_trigger_register(trig); | |
cba4c2ac | 381 | if (err < 0) { |
eb202621 BW |
382 | kfree(trig); |
383 | trig = NULL; | |
09f5fe75 SK |
384 | pr_warn("LED trigger %s failed to register (%d)\n", |
385 | name, err); | |
cba4c2ac | 386 | } |
09f5fe75 SK |
387 | } else { |
388 | pr_warn("LED trigger %s failed to register (no memory)\n", | |
389 | name); | |
390 | } | |
eb202621 | 391 | *tp = trig; |
4d404fd5 | 392 | } |
c3bc9956 | 393 | EXPORT_SYMBOL_GPL(led_trigger_register_simple); |
4d404fd5 | 394 | |
eb202621 | 395 | void led_trigger_unregister_simple(struct led_trigger *trig) |
4d404fd5 | 396 | { |
eb202621 BW |
397 | if (trig) |
398 | led_trigger_unregister(trig); | |
399 | kfree(trig); | |
4d404fd5 | 400 | } |
c3bc9956 | 401 | EXPORT_SYMBOL_GPL(led_trigger_unregister_simple); |