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Commit | Line | Data |
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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
c72a1d60 RP |
2 | /* |
3 | * LED Class Core | |
4 | * | |
5 | * Copyright (C) 2005 John Lenz <lenz@cs.wisc.edu> | |
f8a7c6fe | 6 | * Copyright (C) 2005-2007 Richard Purdie <rpurdie@openedhand.com> |
c72a1d60 RP |
7 | */ |
8 | ||
04713306 JA |
9 | #include <linux/ctype.h> |
10 | #include <linux/device.h> | |
11 | #include <linux/err.h> | |
c72a1d60 | 12 | #include <linux/init.h> |
04713306 JA |
13 | #include <linux/kernel.h> |
14 | #include <linux/leds.h> | |
c72a1d60 | 15 | #include <linux/list.h> |
04713306 | 16 | #include <linux/module.h> |
fd81d7e9 | 17 | #include <linux/property.h> |
04713306 | 18 | #include <linux/slab.h> |
c72a1d60 | 19 | #include <linux/spinlock.h> |
9067359f | 20 | #include <linux/timer.h> |
eb1ce746 | 21 | #include <uapi/linux/uleds.h> |
699a8c7c | 22 | #include <linux/of.h> |
c72a1d60 RP |
23 | #include "leds.h" |
24 | ||
abc3100f HG |
25 | static DEFINE_MUTEX(leds_lookup_lock); |
26 | static LIST_HEAD(leds_lookup_list); | |
c72a1d60 | 27 | |
5baa7503 | 28 | static ssize_t brightness_show(struct device *dev, |
f8a7c6fe | 29 | struct device_attribute *attr, char *buf) |
c72a1d60 | 30 | { |
f8a7c6fe | 31 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
c72a1d60 RP |
32 | |
33 | /* no lock needed for this */ | |
29d76dfa | 34 | led_update_brightness(led_cdev); |
c72a1d60 | 35 | |
dd8e5a20 | 36 | return sprintf(buf, "%u\n", led_cdev->brightness); |
c72a1d60 RP |
37 | } |
38 | ||
5baa7503 | 39 | static ssize_t brightness_store(struct device *dev, |
f8a7c6fe | 40 | struct device_attribute *attr, const char *buf, size_t size) |
c72a1d60 | 41 | { |
f8a7c6fe | 42 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
872b86be | 43 | unsigned long state; |
acd899e4 JA |
44 | ssize_t ret; |
45 | ||
46 | mutex_lock(&led_cdev->led_access); | |
47 | ||
48 | if (led_sysfs_is_disabled(led_cdev)) { | |
49 | ret = -EBUSY; | |
50 | goto unlock; | |
51 | } | |
c72a1d60 | 52 | |
872b86be SK |
53 | ret = kstrtoul(buf, 10, &state); |
54 | if (ret) | |
acd899e4 | 55 | goto unlock; |
3dc7b82e | 56 | |
872b86be SK |
57 | if (state == LED_OFF) |
58 | led_trigger_remove(led_cdev); | |
4d71a4a1 | 59 | led_set_brightness(led_cdev, state); |
0db37915 | 60 | flush_work(&led_cdev->set_brightness_work); |
0013b23d | 61 | |
acd899e4 JA |
62 | ret = size; |
63 | unlock: | |
64 | mutex_unlock(&led_cdev->led_access); | |
65 | return ret; | |
c72a1d60 | 66 | } |
5baa7503 | 67 | static DEVICE_ATTR_RW(brightness); |
c72a1d60 | 68 | |
38419612 | 69 | static ssize_t max_brightness_show(struct device *dev, |
1bd465e6 GL |
70 | struct device_attribute *attr, char *buf) |
71 | { | |
72 | struct led_classdev *led_cdev = dev_get_drvdata(dev); | |
73 | ||
74 | return sprintf(buf, "%u\n", led_cdev->max_brightness); | |
75 | } | |
38419612 | 76 | static DEVICE_ATTR_RO(max_brightness); |
1bd465e6 | 77 | |
c3bc9956 | 78 | #ifdef CONFIG_LEDS_TRIGGERS |
11f70002 AM |
79 | static BIN_ATTR(trigger, 0644, led_trigger_read, led_trigger_write, 0); |
80 | static struct bin_attribute *led_trigger_bin_attrs[] = { | |
81 | &bin_attr_trigger, | |
5baa7503 GKH |
82 | NULL, |
83 | }; | |
84 | static const struct attribute_group led_trigger_group = { | |
11f70002 | 85 | .bin_attrs = led_trigger_bin_attrs, |
5baa7503 GKH |
86 | }; |
87 | #endif | |
88 | ||
89 | static struct attribute *led_class_attrs[] = { | |
90 | &dev_attr_brightness.attr, | |
91 | &dev_attr_max_brightness.attr, | |
92 | NULL, | |
93 | }; | |
94 | ||
95 | static const struct attribute_group led_group = { | |
96 | .attrs = led_class_attrs, | |
97 | }; | |
98 | ||
99 | static const struct attribute_group *led_groups[] = { | |
100 | &led_group, | |
101 | #ifdef CONFIG_LEDS_TRIGGERS | |
102 | &led_trigger_group, | |
c3bc9956 | 103 | #endif |
5baa7503 | 104 | NULL, |
14b5d6dd | 105 | }; |
c72a1d60 | 106 | |
0cb8eb30 HG |
107 | #ifdef CONFIG_LEDS_BRIGHTNESS_HW_CHANGED |
108 | static ssize_t brightness_hw_changed_show(struct device *dev, | |
109 | struct device_attribute *attr, char *buf) | |
110 | { | |
111 | struct led_classdev *led_cdev = dev_get_drvdata(dev); | |
112 | ||
113 | if (led_cdev->brightness_hw_changed == -1) | |
114 | return -ENODATA; | |
115 | ||
116 | return sprintf(buf, "%u\n", led_cdev->brightness_hw_changed); | |
117 | } | |
118 | ||
119 | static DEVICE_ATTR_RO(brightness_hw_changed); | |
120 | ||
121 | static int led_add_brightness_hw_changed(struct led_classdev *led_cdev) | |
122 | { | |
123 | struct device *dev = led_cdev->dev; | |
124 | int ret; | |
125 | ||
126 | ret = device_create_file(dev, &dev_attr_brightness_hw_changed); | |
127 | if (ret) { | |
128 | dev_err(dev, "Error creating brightness_hw_changed\n"); | |
129 | return ret; | |
130 | } | |
131 | ||
132 | led_cdev->brightness_hw_changed_kn = | |
133 | sysfs_get_dirent(dev->kobj.sd, "brightness_hw_changed"); | |
134 | if (!led_cdev->brightness_hw_changed_kn) { | |
135 | dev_err(dev, "Error getting brightness_hw_changed kn\n"); | |
136 | device_remove_file(dev, &dev_attr_brightness_hw_changed); | |
137 | return -ENXIO; | |
138 | } | |
139 | ||
140 | return 0; | |
141 | } | |
142 | ||
143 | static void led_remove_brightness_hw_changed(struct led_classdev *led_cdev) | |
144 | { | |
145 | sysfs_put(led_cdev->brightness_hw_changed_kn); | |
146 | device_remove_file(led_cdev->dev, &dev_attr_brightness_hw_changed); | |
147 | } | |
148 | ||
af0bfab9 | 149 | void led_classdev_notify_brightness_hw_changed(struct led_classdev *led_cdev, unsigned int brightness) |
0cb8eb30 HG |
150 | { |
151 | if (WARN_ON(!led_cdev->brightness_hw_changed_kn)) | |
152 | return; | |
153 | ||
154 | led_cdev->brightness_hw_changed = brightness; | |
155 | sysfs_notify_dirent(led_cdev->brightness_hw_changed_kn); | |
156 | } | |
157 | EXPORT_SYMBOL_GPL(led_classdev_notify_brightness_hw_changed); | |
158 | #else | |
159 | static int led_add_brightness_hw_changed(struct led_classdev *led_cdev) | |
160 | { | |
161 | return 0; | |
162 | } | |
163 | static void led_remove_brightness_hw_changed(struct led_classdev *led_cdev) | |
164 | { | |
165 | } | |
166 | #endif | |
167 | ||
c72a1d60 RP |
168 | /** |
169 | * led_classdev_suspend - suspend an led_classdev. | |
170 | * @led_cdev: the led_classdev to suspend. | |
171 | */ | |
172 | void led_classdev_suspend(struct led_classdev *led_cdev) | |
173 | { | |
174 | led_cdev->flags |= LED_SUSPENDED; | |
81fe8e5b | 175 | led_set_brightness_nopm(led_cdev, 0); |
302a085c | 176 | flush_work(&led_cdev->set_brightness_work); |
c72a1d60 RP |
177 | } |
178 | EXPORT_SYMBOL_GPL(led_classdev_suspend); | |
179 | ||
180 | /** | |
181 | * led_classdev_resume - resume an led_classdev. | |
182 | * @led_cdev: the led_classdev to resume. | |
183 | */ | |
184 | void led_classdev_resume(struct led_classdev *led_cdev) | |
185 | { | |
81fe8e5b | 186 | led_set_brightness_nopm(led_cdev, led_cdev->brightness); |
7aea8389 JA |
187 | |
188 | if (led_cdev->flash_resume) | |
189 | led_cdev->flash_resume(led_cdev); | |
190 | ||
c72a1d60 RP |
191 | led_cdev->flags &= ~LED_SUSPENDED; |
192 | } | |
193 | EXPORT_SYMBOL_GPL(led_classdev_resume); | |
194 | ||
084609bf | 195 | #ifdef CONFIG_PM_SLEEP |
73e1ab41 | 196 | static int led_suspend(struct device *dev) |
859cb7f2 RP |
197 | { |
198 | struct led_classdev *led_cdev = dev_get_drvdata(dev); | |
199 | ||
200 | if (led_cdev->flags & LED_CORE_SUSPENDRESUME) | |
201 | led_classdev_suspend(led_cdev); | |
202 | ||
203 | return 0; | |
204 | } | |
205 | ||
206 | static int led_resume(struct device *dev) | |
207 | { | |
208 | struct led_classdev *led_cdev = dev_get_drvdata(dev); | |
209 | ||
210 | if (led_cdev->flags & LED_CORE_SUSPENDRESUME) | |
211 | led_classdev_resume(led_cdev); | |
212 | ||
213 | return 0; | |
214 | } | |
084609bf | 215 | #endif |
859cb7f2 | 216 | |
084609bf | 217 | static SIMPLE_DEV_PM_OPS(leds_class_dev_pm_ops, led_suspend, led_resume); |
73e1ab41 | 218 | |
fafef58e HG |
219 | static struct led_classdev *led_module_get(struct device *led_dev) |
220 | { | |
221 | struct led_classdev *led_cdev; | |
222 | ||
223 | if (!led_dev) | |
224 | return ERR_PTR(-EPROBE_DEFER); | |
225 | ||
226 | led_cdev = dev_get_drvdata(led_dev); | |
227 | ||
228 | if (!try_module_get(led_cdev->dev->parent->driver->owner)) { | |
229 | put_device(led_cdev->dev); | |
230 | return ERR_PTR(-ENODEV); | |
231 | } | |
232 | ||
233 | return led_cdev; | |
234 | } | |
235 | ||
43a707ae IO |
236 | static const struct class leds_class = { |
237 | .name = "leds", | |
238 | .dev_groups = led_groups, | |
239 | .pm = &leds_class_dev_pm_ops, | |
240 | }; | |
241 | ||
699a8c7c TV |
242 | /** |
243 | * of_led_get() - request a LED device via the LED framework | |
244 | * @np: device node to get the LED device from | |
245 | * @index: the index of the LED | |
246 | * | |
247 | * Returns the LED device parsed from the phandle specified in the "leds" | |
248 | * property of a device tree node or a negative error-code on failure. | |
249 | */ | |
250 | struct led_classdev *of_led_get(struct device_node *np, int index) | |
251 | { | |
252 | struct device *led_dev; | |
699a8c7c TV |
253 | struct device_node *led_node; |
254 | ||
255 | led_node = of_parse_phandle(np, "leds", index); | |
256 | if (!led_node) | |
257 | return ERR_PTR(-ENOENT); | |
258 | ||
43a707ae | 259 | led_dev = class_find_device_by_of_node(&leds_class, led_node); |
699a8c7c | 260 | of_node_put(led_node); |
da1afe8e | 261 | put_device(led_dev); |
699a8c7c | 262 | |
fafef58e | 263 | return led_module_get(led_dev); |
699a8c7c TV |
264 | } |
265 | EXPORT_SYMBOL_GPL(of_led_get); | |
266 | ||
267 | /** | |
268 | * led_put() - release a LED device | |
269 | * @led_cdev: LED device | |
270 | */ | |
271 | void led_put(struct led_classdev *led_cdev) | |
272 | { | |
273 | module_put(led_cdev->dev->parent->driver->owner); | |
44511094 | 274 | put_device(led_cdev->dev); |
699a8c7c TV |
275 | } |
276 | EXPORT_SYMBOL_GPL(led_put); | |
277 | ||
e389240a JJH |
278 | static void devm_led_release(struct device *dev, void *res) |
279 | { | |
280 | struct led_classdev **p = res; | |
281 | ||
282 | led_put(*p); | |
283 | } | |
284 | ||
537bdca2 HG |
285 | static struct led_classdev *__devm_led_get(struct device *dev, struct led_classdev *led) |
286 | { | |
287 | struct led_classdev **dr; | |
288 | ||
289 | dr = devres_alloc(devm_led_release, sizeof(struct led_classdev *), GFP_KERNEL); | |
290 | if (!dr) { | |
291 | led_put(led); | |
292 | return ERR_PTR(-ENOMEM); | |
293 | } | |
294 | ||
295 | *dr = led; | |
296 | devres_add(dev, dr); | |
297 | ||
298 | return led; | |
299 | } | |
300 | ||
e389240a JJH |
301 | /** |
302 | * devm_of_led_get - Resource-managed request of a LED device | |
303 | * @dev: LED consumer | |
304 | * @index: index of the LED to obtain in the consumer | |
305 | * | |
306 | * The device node of the device is parse to find the request LED device. | |
307 | * The LED device returned from this function is automatically released | |
308 | * on driver detach. | |
309 | * | |
310 | * @return a pointer to a LED device or ERR_PTR(errno) on failure. | |
311 | */ | |
312 | struct led_classdev *__must_check devm_of_led_get(struct device *dev, | |
313 | int index) | |
314 | { | |
315 | struct led_classdev *led; | |
e389240a JJH |
316 | |
317 | if (!dev) | |
318 | return ERR_PTR(-EINVAL); | |
319 | ||
e389240a JJH |
320 | led = of_led_get(dev->of_node, index); |
321 | if (IS_ERR(led)) | |
322 | return led; | |
323 | ||
537bdca2 | 324 | return __devm_led_get(dev, led); |
e389240a JJH |
325 | } |
326 | EXPORT_SYMBOL_GPL(devm_of_led_get); | |
327 | ||
abc3100f HG |
328 | /** |
329 | * led_get() - request a LED device via the LED framework | |
330 | * @dev: device for which to get the LED device | |
331 | * @con_id: name of the LED from the device's point of view | |
332 | * | |
333 | * @return a pointer to a LED device or ERR_PTR(errno) on failure. | |
334 | */ | |
335 | struct led_classdev *led_get(struct device *dev, char *con_id) | |
336 | { | |
337 | struct led_lookup_data *lookup; | |
338 | const char *provider = NULL; | |
339 | struct device *led_dev; | |
340 | ||
341 | mutex_lock(&leds_lookup_lock); | |
342 | list_for_each_entry(lookup, &leds_lookup_list, list) { | |
343 | if (!strcmp(lookup->dev_id, dev_name(dev)) && | |
344 | !strcmp(lookup->con_id, con_id)) { | |
345 | provider = kstrdup_const(lookup->provider, GFP_KERNEL); | |
346 | break; | |
347 | } | |
348 | } | |
349 | mutex_unlock(&leds_lookup_lock); | |
350 | ||
351 | if (!provider) | |
352 | return ERR_PTR(-ENOENT); | |
353 | ||
43a707ae | 354 | led_dev = class_find_device_by_name(&leds_class, provider); |
abc3100f HG |
355 | kfree_const(provider); |
356 | ||
357 | return led_module_get(led_dev); | |
358 | } | |
359 | EXPORT_SYMBOL_GPL(led_get); | |
360 | ||
361 | /** | |
362 | * devm_led_get() - request a LED device via the LED framework | |
363 | * @dev: device for which to get the LED device | |
364 | * @con_id: name of the LED from the device's point of view | |
365 | * | |
366 | * The LED device returned from this function is automatically released | |
367 | * on driver detach. | |
368 | * | |
369 | * @return a pointer to a LED device or ERR_PTR(errno) on failure. | |
370 | */ | |
371 | struct led_classdev *devm_led_get(struct device *dev, char *con_id) | |
372 | { | |
373 | struct led_classdev *led; | |
374 | ||
375 | led = led_get(dev, con_id); | |
376 | if (IS_ERR(led)) | |
377 | return led; | |
378 | ||
379 | return __devm_led_get(dev, led); | |
380 | } | |
381 | EXPORT_SYMBOL_GPL(devm_led_get); | |
382 | ||
383 | /** | |
384 | * led_add_lookup() - Add a LED lookup table entry | |
385 | * @led_lookup: the lookup table entry to add | |
386 | * | |
387 | * Add a LED lookup table entry. On systems without devicetree the lookup table | |
388 | * is used by led_get() to find LEDs. | |
389 | */ | |
390 | void led_add_lookup(struct led_lookup_data *led_lookup) | |
391 | { | |
392 | mutex_lock(&leds_lookup_lock); | |
393 | list_add_tail(&led_lookup->list, &leds_lookup_list); | |
394 | mutex_unlock(&leds_lookup_lock); | |
395 | } | |
396 | EXPORT_SYMBOL_GPL(led_add_lookup); | |
397 | ||
398 | /** | |
399 | * led_remove_lookup() - Remove a LED lookup table entry | |
400 | * @led_lookup: the lookup table entry to remove | |
401 | */ | |
402 | void led_remove_lookup(struct led_lookup_data *led_lookup) | |
403 | { | |
404 | mutex_lock(&leds_lookup_lock); | |
405 | list_del(&led_lookup->list); | |
406 | mutex_unlock(&leds_lookup_lock); | |
407 | } | |
408 | EXPORT_SYMBOL_GPL(led_remove_lookup); | |
409 | ||
afb48153 JJH |
410 | /** |
411 | * devm_of_led_get_optional - Resource-managed request of an optional LED device | |
412 | * @dev: LED consumer | |
413 | * @index: index of the LED to obtain in the consumer | |
414 | * | |
415 | * The device node of the device is parsed to find the requested LED device. | |
416 | * The LED device returned from this function is automatically released | |
417 | * on driver detach. | |
418 | * | |
419 | * @return a pointer to a LED device, ERR_PTR(errno) on failure and NULL if the | |
420 | * led was not found. | |
421 | */ | |
422 | struct led_classdev *__must_check devm_of_led_get_optional(struct device *dev, | |
423 | int index) | |
424 | { | |
425 | struct led_classdev *led; | |
426 | ||
427 | led = devm_of_led_get(dev, index); | |
428 | if (IS_ERR(led) && PTR_ERR(led) == -ENOENT) | |
429 | return NULL; | |
430 | ||
431 | return led; | |
432 | } | |
433 | EXPORT_SYMBOL_GPL(devm_of_led_get_optional); | |
434 | ||
a96aa64c RR |
435 | static int led_classdev_next_name(const char *init_name, char *name, |
436 | size_t len) | |
437 | { | |
438 | unsigned int i = 0; | |
439 | int ret = 0; | |
e5b5a61f | 440 | struct device *dev; |
a96aa64c | 441 | |
bf4a35e9 | 442 | strscpy(name, init_name, len); |
a96aa64c | 443 | |
e5b5a61f | 444 | while ((ret < len) && |
43a707ae | 445 | (dev = class_find_device_by_name(&leds_class, name))) { |
e5b5a61f | 446 | put_device(dev); |
a96aa64c | 447 | ret = snprintf(name, len, "%s_%u", init_name, ++i); |
e5b5a61f | 448 | } |
a96aa64c RR |
449 | |
450 | if (ret >= len) | |
451 | return -ENOMEM; | |
452 | ||
453 | return i; | |
454 | } | |
455 | ||
c72a1d60 | 456 | /** |
b2b998c0 JA |
457 | * led_classdev_register_ext - register a new object of led_classdev class |
458 | * with init data. | |
442c6098 RM |
459 | * |
460 | * @parent: parent of LED device | |
c72a1d60 | 461 | * @led_cdev: the led_classdev structure for this device. |
b2b998c0 | 462 | * @init_data: LED class device initialization data |
c72a1d60 | 463 | */ |
b2b998c0 JA |
464 | int led_classdev_register_ext(struct device *parent, |
465 | struct led_classdev *led_cdev, | |
466 | struct led_init_data *init_data) | |
c72a1d60 | 467 | { |
bb4e9af0 JA |
468 | char composed_name[LED_MAX_NAME_SIZE]; |
469 | char final_name[LED_MAX_NAME_SIZE]; | |
470 | const char *proposed_name = composed_name; | |
a96aa64c RR |
471 | int ret; |
472 | ||
bb4e9af0 JA |
473 | if (init_data) { |
474 | if (init_data->devname_mandatory && !init_data->devicename) { | |
475 | dev_err(parent, "Mandatory device name is missing"); | |
476 | return -EINVAL; | |
477 | } | |
478 | ret = led_compose_name(parent, init_data, composed_name); | |
479 | if (ret < 0) | |
480 | return ret; | |
c49d6cab | 481 | |
41906632 | 482 | if (init_data->fwnode) { |
c49d6cab MB |
483 | fwnode_property_read_string(init_data->fwnode, |
484 | "linux,default-trigger", | |
485 | &led_cdev->default_trigger); | |
41906632 EJ |
486 | |
487 | if (fwnode_property_present(init_data->fwnode, | |
488 | "retain-state-shutdown")) | |
489 | led_cdev->flags |= LED_RETAIN_AT_SHUTDOWN; | |
7cd7a299 AR |
490 | |
491 | fwnode_property_read_u32(init_data->fwnode, | |
492 | "max-brightness", | |
493 | &led_cdev->max_brightness); | |
c7d80059 JJH |
494 | |
495 | if (fwnode_property_present(init_data->fwnode, "color")) | |
496 | fwnode_property_read_u32(init_data->fwnode, "color", | |
497 | &led_cdev->color); | |
41906632 | 498 | } |
bb4e9af0 JA |
499 | } else { |
500 | proposed_name = led_cdev->name; | |
501 | } | |
502 | ||
503 | ret = led_classdev_next_name(proposed_name, final_name, sizeof(final_name)); | |
a96aa64c RR |
504 | if (ret < 0) |
505 | return ret; | |
506 | ||
c7d80059 JJH |
507 | if (led_cdev->color >= LED_COLOR_ID_MAX) |
508 | dev_warn(parent, "LED %s color identifier out of range\n", final_name); | |
509 | ||
6d71021a LH |
510 | mutex_init(&led_cdev->led_access); |
511 | mutex_lock(&led_cdev->led_access); | |
43a707ae IO |
512 | led_cdev->dev = device_create_with_groups(&leds_class, parent, 0, |
513 | led_cdev, led_cdev->groups, "%s", final_name); | |
6d71021a LH |
514 | if (IS_ERR(led_cdev->dev)) { |
515 | mutex_unlock(&led_cdev->led_access); | |
f8a7c6fe | 516 | return PTR_ERR(led_cdev->dev); |
6d71021a | 517 | } |
495b8966 SV |
518 | if (init_data && init_data->fwnode) |
519 | device_set_node(led_cdev->dev, init_data->fwnode); | |
c72a1d60 | 520 | |
a96aa64c | 521 | if (ret) |
6f06c7f8 | 522 | dev_warn(parent, "Led %s renamed to %s due to name collision", |
64ed6588 | 523 | proposed_name, dev_name(led_cdev->dev)); |
a96aa64c | 524 | |
0cb8eb30 HG |
525 | if (led_cdev->flags & LED_BRIGHT_HW_CHANGED) { |
526 | ret = led_add_brightness_hw_changed(led_cdev); | |
527 | if (ret) { | |
528 | device_unregister(led_cdev->dev); | |
1dbb9fb4 | 529 | led_cdev->dev = NULL; |
6d71021a | 530 | mutex_unlock(&led_cdev->led_access); |
0cb8eb30 HG |
531 | return ret; |
532 | } | |
533 | } | |
534 | ||
a9c6ce57 | 535 | led_cdev->work_flags = 0; |
270c3957 RP |
536 | #ifdef CONFIG_LEDS_TRIGGERS |
537 | init_rwsem(&led_cdev->trigger_lock); | |
0cb8eb30 HG |
538 | #endif |
539 | #ifdef CONFIG_LEDS_BRIGHTNESS_HW_CHANGED | |
540 | led_cdev->brightness_hw_changed = -1; | |
270c3957 | 541 | #endif |
c72a1d60 | 542 | /* add to the list of leds */ |
72f8da32 | 543 | down_write(&leds_list_lock); |
c72a1d60 | 544 | list_add_tail(&led_cdev->node, &leds_list); |
72f8da32 | 545 | up_write(&leds_list_lock); |
c72a1d60 | 546 | |
1bd465e6 GL |
547 | if (!led_cdev->max_brightness) |
548 | led_cdev->max_brightness = LED_FULL; | |
549 | ||
29d76dfa HMH |
550 | led_update_brightness(led_cdev); |
551 | ||
757b06ae | 552 | led_init_core(led_cdev); |
5ada28bf | 553 | |
c3bc9956 | 554 | #ifdef CONFIG_LEDS_TRIGGERS |
12fda168 | 555 | led_trigger_set_default(led_cdev); |
c3bc9956 RP |
556 | #endif |
557 | ||
6d71021a LH |
558 | mutex_unlock(&led_cdev->led_access); |
559 | ||
d23e7b8b | 560 | dev_dbg(parent, "Registered led device: %s\n", |
f8a7c6fe | 561 | led_cdev->name); |
c72a1d60 RP |
562 | |
563 | return 0; | |
564 | } | |
b2b998c0 | 565 | EXPORT_SYMBOL_GPL(led_classdev_register_ext); |
c72a1d60 RP |
566 | |
567 | /** | |
0266a458 | 568 | * led_classdev_unregister - unregisters a object of led_properties class. |
70d63ccc | 569 | * @led_cdev: the led device to unregister |
c72a1d60 RP |
570 | * |
571 | * Unregisters a previously registered via led_classdev_register object. | |
572 | */ | |
b844eba2 | 573 | void led_classdev_unregister(struct led_classdev *led_cdev) |
c72a1d60 | 574 | { |
1dbb9fb4 AS |
575 | if (IS_ERR_OR_NULL(led_cdev->dev)) |
576 | return; | |
577 | ||
c3bc9956 | 578 | #ifdef CONFIG_LEDS_TRIGGERS |
dc47206e | 579 | down_write(&led_cdev->trigger_lock); |
c3bc9956 RP |
580 | if (led_cdev->trigger) |
581 | led_trigger_set(led_cdev, NULL); | |
dc47206e | 582 | up_write(&led_cdev->trigger_lock); |
c3bc9956 | 583 | #endif |
c72a1d60 | 584 | |
d84d80f3 HK |
585 | led_cdev->flags |= LED_UNREGISTERING; |
586 | ||
5ada28bf | 587 | /* Stop blinking */ |
d23a22a7 | 588 | led_stop_software_blink(led_cdev); |
d1aa577f | 589 | |
41906632 EJ |
590 | if (!(led_cdev->flags & LED_RETAIN_AT_SHUTDOWN)) |
591 | led_set_brightness(led_cdev, LED_OFF); | |
5ada28bf | 592 | |
d1aa577f MK |
593 | flush_work(&led_cdev->set_brightness_work); |
594 | ||
0cb8eb30 HG |
595 | if (led_cdev->flags & LED_BRIGHT_HW_CHANGED) |
596 | led_remove_brightness_hw_changed(led_cdev); | |
597 | ||
b844eba2 | 598 | device_unregister(led_cdev->dev); |
c72a1d60 | 599 | |
72f8da32 | 600 | down_write(&leds_list_lock); |
c72a1d60 | 601 | list_del(&led_cdev->node); |
72f8da32 | 602 | up_write(&leds_list_lock); |
acd899e4 JA |
603 | |
604 | mutex_destroy(&led_cdev->led_access); | |
c72a1d60 | 605 | } |
b844eba2 | 606 | EXPORT_SYMBOL_GPL(led_classdev_unregister); |
c72a1d60 | 607 | |
ca1bb4ee BA |
608 | static void devm_led_classdev_release(struct device *dev, void *res) |
609 | { | |
610 | led_classdev_unregister(*(struct led_classdev **)res); | |
611 | } | |
612 | ||
613 | /** | |
b2b998c0 | 614 | * devm_led_classdev_register_ext - resource managed led_classdev_register_ext() |
442c6098 RM |
615 | * |
616 | * @parent: parent of LED device | |
ca1bb4ee | 617 | * @led_cdev: the led_classdev structure for this device. |
b2b998c0 | 618 | * @init_data: LED class device initialization data |
ca1bb4ee | 619 | */ |
b2b998c0 JA |
620 | int devm_led_classdev_register_ext(struct device *parent, |
621 | struct led_classdev *led_cdev, | |
622 | struct led_init_data *init_data) | |
ca1bb4ee BA |
623 | { |
624 | struct led_classdev **dr; | |
625 | int rc; | |
626 | ||
627 | dr = devres_alloc(devm_led_classdev_release, sizeof(*dr), GFP_KERNEL); | |
628 | if (!dr) | |
629 | return -ENOMEM; | |
630 | ||
b2b998c0 | 631 | rc = led_classdev_register_ext(parent, led_cdev, init_data); |
ca1bb4ee BA |
632 | if (rc) { |
633 | devres_free(dr); | |
634 | return rc; | |
635 | } | |
636 | ||
637 | *dr = led_cdev; | |
638 | devres_add(parent, dr); | |
639 | ||
640 | return 0; | |
641 | } | |
b2b998c0 | 642 | EXPORT_SYMBOL_GPL(devm_led_classdev_register_ext); |
ca1bb4ee BA |
643 | |
644 | static int devm_led_classdev_match(struct device *dev, void *res, void *data) | |
645 | { | |
4b83cf07 | 646 | struct led_classdev **p = res; |
ca1bb4ee BA |
647 | |
648 | if (WARN_ON(!p || !*p)) | |
649 | return 0; | |
650 | ||
651 | return *p == data; | |
652 | } | |
653 | ||
654 | /** | |
655 | * devm_led_classdev_unregister() - resource managed led_classdev_unregister() | |
6a3a871b | 656 | * @dev: The device to unregister. |
ca1bb4ee BA |
657 | * @led_cdev: the led_classdev structure for this device. |
658 | */ | |
659 | void devm_led_classdev_unregister(struct device *dev, | |
660 | struct led_classdev *led_cdev) | |
661 | { | |
662 | WARN_ON(devres_release(dev, | |
663 | devm_led_classdev_release, | |
664 | devm_led_classdev_match, led_cdev)); | |
665 | } | |
666 | EXPORT_SYMBOL_GPL(devm_led_classdev_unregister); | |
667 | ||
c72a1d60 RP |
668 | static int __init leds_init(void) |
669 | { | |
43a707ae | 670 | return class_register(&leds_class); |
c72a1d60 RP |
671 | } |
672 | ||
673 | static void __exit leds_exit(void) | |
674 | { | |
43a707ae | 675 | class_unregister(&leds_class); |
c72a1d60 RP |
676 | } |
677 | ||
678 | subsys_initcall(leds_init); | |
679 | module_exit(leds_exit); | |
680 | ||
681 | MODULE_AUTHOR("John Lenz, Richard Purdie"); | |
682 | MODULE_LICENSE("GPL"); | |
683 | MODULE_DESCRIPTION("LED Class Interface"); |