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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 | ||
25 | static struct class *leds_class; | |
26 | ||
5baa7503 | 27 | static ssize_t brightness_show(struct device *dev, |
f8a7c6fe | 28 | struct device_attribute *attr, char *buf) |
c72a1d60 | 29 | { |
f8a7c6fe | 30 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
c72a1d60 RP |
31 | |
32 | /* no lock needed for this */ | |
29d76dfa | 33 | led_update_brightness(led_cdev); |
c72a1d60 | 34 | |
dd8e5a20 | 35 | return sprintf(buf, "%u\n", led_cdev->brightness); |
c72a1d60 RP |
36 | } |
37 | ||
5baa7503 | 38 | static ssize_t brightness_store(struct device *dev, |
f8a7c6fe | 39 | struct device_attribute *attr, const char *buf, size_t size) |
c72a1d60 | 40 | { |
f8a7c6fe | 41 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
872b86be | 42 | unsigned long state; |
acd899e4 JA |
43 | ssize_t ret; |
44 | ||
45 | mutex_lock(&led_cdev->led_access); | |
46 | ||
47 | if (led_sysfs_is_disabled(led_cdev)) { | |
48 | ret = -EBUSY; | |
49 | goto unlock; | |
50 | } | |
c72a1d60 | 51 | |
872b86be SK |
52 | ret = kstrtoul(buf, 10, &state); |
53 | if (ret) | |
acd899e4 | 54 | goto unlock; |
3dc7b82e | 55 | |
872b86be SK |
56 | if (state == LED_OFF) |
57 | led_trigger_remove(led_cdev); | |
4d71a4a1 | 58 | led_set_brightness(led_cdev, state); |
0db37915 | 59 | flush_work(&led_cdev->set_brightness_work); |
0013b23d | 60 | |
acd899e4 JA |
61 | ret = size; |
62 | unlock: | |
63 | mutex_unlock(&led_cdev->led_access); | |
64 | return ret; | |
c72a1d60 | 65 | } |
5baa7503 | 66 | static DEVICE_ATTR_RW(brightness); |
c72a1d60 | 67 | |
38419612 | 68 | static ssize_t max_brightness_show(struct device *dev, |
1bd465e6 GL |
69 | struct device_attribute *attr, char *buf) |
70 | { | |
71 | struct led_classdev *led_cdev = dev_get_drvdata(dev); | |
72 | ||
73 | return sprintf(buf, "%u\n", led_cdev->max_brightness); | |
74 | } | |
38419612 | 75 | static DEVICE_ATTR_RO(max_brightness); |
1bd465e6 | 76 | |
c3bc9956 | 77 | #ifdef CONFIG_LEDS_TRIGGERS |
11f70002 AM |
78 | static BIN_ATTR(trigger, 0644, led_trigger_read, led_trigger_write, 0); |
79 | static struct bin_attribute *led_trigger_bin_attrs[] = { | |
80 | &bin_attr_trigger, | |
5baa7503 GKH |
81 | NULL, |
82 | }; | |
83 | static const struct attribute_group led_trigger_group = { | |
11f70002 | 84 | .bin_attrs = led_trigger_bin_attrs, |
5baa7503 GKH |
85 | }; |
86 | #endif | |
87 | ||
88 | static struct attribute *led_class_attrs[] = { | |
89 | &dev_attr_brightness.attr, | |
90 | &dev_attr_max_brightness.attr, | |
91 | NULL, | |
92 | }; | |
93 | ||
94 | static const struct attribute_group led_group = { | |
95 | .attrs = led_class_attrs, | |
96 | }; | |
97 | ||
98 | static const struct attribute_group *led_groups[] = { | |
99 | &led_group, | |
100 | #ifdef CONFIG_LEDS_TRIGGERS | |
101 | &led_trigger_group, | |
c3bc9956 | 102 | #endif |
5baa7503 | 103 | NULL, |
14b5d6dd | 104 | }; |
c72a1d60 | 105 | |
0cb8eb30 HG |
106 | #ifdef CONFIG_LEDS_BRIGHTNESS_HW_CHANGED |
107 | static ssize_t brightness_hw_changed_show(struct device *dev, | |
108 | struct device_attribute *attr, char *buf) | |
109 | { | |
110 | struct led_classdev *led_cdev = dev_get_drvdata(dev); | |
111 | ||
112 | if (led_cdev->brightness_hw_changed == -1) | |
113 | return -ENODATA; | |
114 | ||
115 | return sprintf(buf, "%u\n", led_cdev->brightness_hw_changed); | |
116 | } | |
117 | ||
118 | static DEVICE_ATTR_RO(brightness_hw_changed); | |
119 | ||
120 | static int led_add_brightness_hw_changed(struct led_classdev *led_cdev) | |
121 | { | |
122 | struct device *dev = led_cdev->dev; | |
123 | int ret; | |
124 | ||
125 | ret = device_create_file(dev, &dev_attr_brightness_hw_changed); | |
126 | if (ret) { | |
127 | dev_err(dev, "Error creating brightness_hw_changed\n"); | |
128 | return ret; | |
129 | } | |
130 | ||
131 | led_cdev->brightness_hw_changed_kn = | |
132 | sysfs_get_dirent(dev->kobj.sd, "brightness_hw_changed"); | |
133 | if (!led_cdev->brightness_hw_changed_kn) { | |
134 | dev_err(dev, "Error getting brightness_hw_changed kn\n"); | |
135 | device_remove_file(dev, &dev_attr_brightness_hw_changed); | |
136 | return -ENXIO; | |
137 | } | |
138 | ||
139 | return 0; | |
140 | } | |
141 | ||
142 | static void led_remove_brightness_hw_changed(struct led_classdev *led_cdev) | |
143 | { | |
144 | sysfs_put(led_cdev->brightness_hw_changed_kn); | |
145 | device_remove_file(led_cdev->dev, &dev_attr_brightness_hw_changed); | |
146 | } | |
147 | ||
148 | void led_classdev_notify_brightness_hw_changed(struct led_classdev *led_cdev, | |
149 | enum led_brightness brightness) | |
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 | |
699a8c7c TV |
219 | /** |
220 | * of_led_get() - request a LED device via the LED framework | |
221 | * @np: device node to get the LED device from | |
222 | * @index: the index of the LED | |
223 | * | |
224 | * Returns the LED device parsed from the phandle specified in the "leds" | |
225 | * property of a device tree node or a negative error-code on failure. | |
226 | */ | |
227 | struct led_classdev *of_led_get(struct device_node *np, int index) | |
228 | { | |
229 | struct device *led_dev; | |
230 | struct led_classdev *led_cdev; | |
231 | struct device_node *led_node; | |
232 | ||
233 | led_node = of_parse_phandle(np, "leds", index); | |
234 | if (!led_node) | |
235 | return ERR_PTR(-ENOENT); | |
236 | ||
237 | led_dev = class_find_device_by_of_node(leds_class, led_node); | |
238 | of_node_put(led_node); | |
239 | ||
240 | if (!led_dev) | |
241 | return ERR_PTR(-EPROBE_DEFER); | |
242 | ||
243 | led_cdev = dev_get_drvdata(led_dev); | |
244 | ||
245 | if (!try_module_get(led_cdev->dev->parent->driver->owner)) | |
246 | return ERR_PTR(-ENODEV); | |
247 | ||
248 | return led_cdev; | |
249 | } | |
250 | EXPORT_SYMBOL_GPL(of_led_get); | |
251 | ||
252 | /** | |
253 | * led_put() - release a LED device | |
254 | * @led_cdev: LED device | |
255 | */ | |
256 | void led_put(struct led_classdev *led_cdev) | |
257 | { | |
258 | module_put(led_cdev->dev->parent->driver->owner); | |
259 | } | |
260 | EXPORT_SYMBOL_GPL(led_put); | |
261 | ||
e389240a JJH |
262 | static void devm_led_release(struct device *dev, void *res) |
263 | { | |
264 | struct led_classdev **p = res; | |
265 | ||
266 | led_put(*p); | |
267 | } | |
268 | ||
269 | /** | |
270 | * devm_of_led_get - Resource-managed request of a LED device | |
271 | * @dev: LED consumer | |
272 | * @index: index of the LED to obtain in the consumer | |
273 | * | |
274 | * The device node of the device is parse to find the request LED device. | |
275 | * The LED device returned from this function is automatically released | |
276 | * on driver detach. | |
277 | * | |
278 | * @return a pointer to a LED device or ERR_PTR(errno) on failure. | |
279 | */ | |
280 | struct led_classdev *__must_check devm_of_led_get(struct device *dev, | |
281 | int index) | |
282 | { | |
283 | struct led_classdev *led; | |
284 | struct led_classdev **dr; | |
285 | ||
286 | if (!dev) | |
287 | return ERR_PTR(-EINVAL); | |
288 | ||
289 | /* Not using device tree? */ | |
290 | if (!IS_ENABLED(CONFIG_OF) || !dev->of_node) | |
291 | return ERR_PTR(-ENOTSUPP); | |
292 | ||
293 | led = of_led_get(dev->of_node, index); | |
294 | if (IS_ERR(led)) | |
295 | return led; | |
296 | ||
297 | dr = devres_alloc(devm_led_release, sizeof(struct led_classdev *), | |
298 | GFP_KERNEL); | |
299 | if (!dr) { | |
300 | led_put(led); | |
301 | return ERR_PTR(-ENOMEM); | |
302 | } | |
303 | ||
304 | *dr = led; | |
305 | devres_add(dev, dr); | |
306 | ||
307 | return led; | |
308 | } | |
309 | EXPORT_SYMBOL_GPL(devm_of_led_get); | |
310 | ||
a96aa64c RR |
311 | static int led_classdev_next_name(const char *init_name, char *name, |
312 | size_t len) | |
313 | { | |
314 | unsigned int i = 0; | |
315 | int ret = 0; | |
e5b5a61f | 316 | struct device *dev; |
a96aa64c RR |
317 | |
318 | strlcpy(name, init_name, len); | |
319 | ||
e5b5a61f | 320 | while ((ret < len) && |
6cda08a2 | 321 | (dev = class_find_device_by_name(leds_class, name))) { |
e5b5a61f | 322 | put_device(dev); |
a96aa64c | 323 | ret = snprintf(name, len, "%s_%u", init_name, ++i); |
e5b5a61f | 324 | } |
a96aa64c RR |
325 | |
326 | if (ret >= len) | |
327 | return -ENOMEM; | |
328 | ||
329 | return i; | |
330 | } | |
331 | ||
c72a1d60 | 332 | /** |
b2b998c0 JA |
333 | * led_classdev_register_ext - register a new object of led_classdev class |
334 | * with init data. | |
442c6098 RM |
335 | * |
336 | * @parent: parent of LED device | |
c72a1d60 | 337 | * @led_cdev: the led_classdev structure for this device. |
b2b998c0 | 338 | * @init_data: LED class device initialization data |
c72a1d60 | 339 | */ |
b2b998c0 JA |
340 | int led_classdev_register_ext(struct device *parent, |
341 | struct led_classdev *led_cdev, | |
342 | struct led_init_data *init_data) | |
c72a1d60 | 343 | { |
bb4e9af0 JA |
344 | char composed_name[LED_MAX_NAME_SIZE]; |
345 | char final_name[LED_MAX_NAME_SIZE]; | |
346 | const char *proposed_name = composed_name; | |
a96aa64c RR |
347 | int ret; |
348 | ||
bb4e9af0 JA |
349 | if (init_data) { |
350 | if (init_data->devname_mandatory && !init_data->devicename) { | |
351 | dev_err(parent, "Mandatory device name is missing"); | |
352 | return -EINVAL; | |
353 | } | |
354 | ret = led_compose_name(parent, init_data, composed_name); | |
355 | if (ret < 0) | |
356 | return ret; | |
357 | } else { | |
358 | proposed_name = led_cdev->name; | |
359 | } | |
360 | ||
361 | ret = led_classdev_next_name(proposed_name, final_name, sizeof(final_name)); | |
a96aa64c RR |
362 | if (ret < 0) |
363 | return ret; | |
364 | ||
6d71021a LH |
365 | mutex_init(&led_cdev->led_access); |
366 | mutex_lock(&led_cdev->led_access); | |
d0d480cc | 367 | led_cdev->dev = device_create_with_groups(leds_class, parent, 0, |
bb4e9af0 | 368 | led_cdev, led_cdev->groups, "%s", final_name); |
6d71021a LH |
369 | if (IS_ERR(led_cdev->dev)) { |
370 | mutex_unlock(&led_cdev->led_access); | |
f8a7c6fe | 371 | return PTR_ERR(led_cdev->dev); |
6d71021a | 372 | } |
7a349e8c | 373 | if (init_data && init_data->fwnode) { |
fd81d7e9 | 374 | led_cdev->dev->fwnode = init_data->fwnode; |
7a349e8c JJH |
375 | led_cdev->dev->of_node = to_of_node(init_data->fwnode); |
376 | } | |
c72a1d60 | 377 | |
a96aa64c | 378 | if (ret) |
6f06c7f8 | 379 | dev_warn(parent, "Led %s renamed to %s due to name collision", |
64ed6588 | 380 | proposed_name, dev_name(led_cdev->dev)); |
a96aa64c | 381 | |
0cb8eb30 HG |
382 | if (led_cdev->flags & LED_BRIGHT_HW_CHANGED) { |
383 | ret = led_add_brightness_hw_changed(led_cdev); | |
384 | if (ret) { | |
385 | device_unregister(led_cdev->dev); | |
1dbb9fb4 | 386 | led_cdev->dev = NULL; |
6d71021a | 387 | mutex_unlock(&led_cdev->led_access); |
0cb8eb30 HG |
388 | return ret; |
389 | } | |
390 | } | |
391 | ||
a9c6ce57 | 392 | led_cdev->work_flags = 0; |
270c3957 RP |
393 | #ifdef CONFIG_LEDS_TRIGGERS |
394 | init_rwsem(&led_cdev->trigger_lock); | |
0cb8eb30 HG |
395 | #endif |
396 | #ifdef CONFIG_LEDS_BRIGHTNESS_HW_CHANGED | |
397 | led_cdev->brightness_hw_changed = -1; | |
270c3957 | 398 | #endif |
c72a1d60 | 399 | /* add to the list of leds */ |
72f8da32 | 400 | down_write(&leds_list_lock); |
c72a1d60 | 401 | list_add_tail(&led_cdev->node, &leds_list); |
72f8da32 | 402 | up_write(&leds_list_lock); |
c72a1d60 | 403 | |
1bd465e6 GL |
404 | if (!led_cdev->max_brightness) |
405 | led_cdev->max_brightness = LED_FULL; | |
406 | ||
29d76dfa HMH |
407 | led_update_brightness(led_cdev); |
408 | ||
757b06ae | 409 | led_init_core(led_cdev); |
5ada28bf | 410 | |
c3bc9956 | 411 | #ifdef CONFIG_LEDS_TRIGGERS |
12fda168 | 412 | led_trigger_set_default(led_cdev); |
c3bc9956 RP |
413 | #endif |
414 | ||
6d71021a LH |
415 | mutex_unlock(&led_cdev->led_access); |
416 | ||
d23e7b8b | 417 | dev_dbg(parent, "Registered led device: %s\n", |
f8a7c6fe | 418 | led_cdev->name); |
c72a1d60 RP |
419 | |
420 | return 0; | |
421 | } | |
b2b998c0 | 422 | EXPORT_SYMBOL_GPL(led_classdev_register_ext); |
c72a1d60 RP |
423 | |
424 | /** | |
0266a458 | 425 | * led_classdev_unregister - unregisters a object of led_properties class. |
70d63ccc | 426 | * @led_cdev: the led device to unregister |
c72a1d60 RP |
427 | * |
428 | * Unregisters a previously registered via led_classdev_register object. | |
429 | */ | |
b844eba2 | 430 | void led_classdev_unregister(struct led_classdev *led_cdev) |
c72a1d60 | 431 | { |
1dbb9fb4 AS |
432 | if (IS_ERR_OR_NULL(led_cdev->dev)) |
433 | return; | |
434 | ||
c3bc9956 | 435 | #ifdef CONFIG_LEDS_TRIGGERS |
dc47206e | 436 | down_write(&led_cdev->trigger_lock); |
c3bc9956 RP |
437 | if (led_cdev->trigger) |
438 | led_trigger_set(led_cdev, NULL); | |
dc47206e | 439 | up_write(&led_cdev->trigger_lock); |
c3bc9956 | 440 | #endif |
c72a1d60 | 441 | |
d84d80f3 HK |
442 | led_cdev->flags |= LED_UNREGISTERING; |
443 | ||
5ada28bf | 444 | /* Stop blinking */ |
d23a22a7 | 445 | led_stop_software_blink(led_cdev); |
d1aa577f | 446 | |
19cd67e2 | 447 | led_set_brightness(led_cdev, LED_OFF); |
5ada28bf | 448 | |
d1aa577f MK |
449 | flush_work(&led_cdev->set_brightness_work); |
450 | ||
0cb8eb30 HG |
451 | if (led_cdev->flags & LED_BRIGHT_HW_CHANGED) |
452 | led_remove_brightness_hw_changed(led_cdev); | |
453 | ||
b844eba2 | 454 | device_unregister(led_cdev->dev); |
c72a1d60 | 455 | |
72f8da32 | 456 | down_write(&leds_list_lock); |
c72a1d60 | 457 | list_del(&led_cdev->node); |
72f8da32 | 458 | up_write(&leds_list_lock); |
acd899e4 JA |
459 | |
460 | mutex_destroy(&led_cdev->led_access); | |
c72a1d60 | 461 | } |
b844eba2 | 462 | EXPORT_SYMBOL_GPL(led_classdev_unregister); |
c72a1d60 | 463 | |
ca1bb4ee BA |
464 | static void devm_led_classdev_release(struct device *dev, void *res) |
465 | { | |
466 | led_classdev_unregister(*(struct led_classdev **)res); | |
467 | } | |
468 | ||
469 | /** | |
b2b998c0 | 470 | * devm_led_classdev_register_ext - resource managed led_classdev_register_ext() |
442c6098 RM |
471 | * |
472 | * @parent: parent of LED device | |
ca1bb4ee | 473 | * @led_cdev: the led_classdev structure for this device. |
b2b998c0 | 474 | * @init_data: LED class device initialization data |
ca1bb4ee | 475 | */ |
b2b998c0 JA |
476 | int devm_led_classdev_register_ext(struct device *parent, |
477 | struct led_classdev *led_cdev, | |
478 | struct led_init_data *init_data) | |
ca1bb4ee BA |
479 | { |
480 | struct led_classdev **dr; | |
481 | int rc; | |
482 | ||
483 | dr = devres_alloc(devm_led_classdev_release, sizeof(*dr), GFP_KERNEL); | |
484 | if (!dr) | |
485 | return -ENOMEM; | |
486 | ||
b2b998c0 | 487 | rc = led_classdev_register_ext(parent, led_cdev, init_data); |
ca1bb4ee BA |
488 | if (rc) { |
489 | devres_free(dr); | |
490 | return rc; | |
491 | } | |
492 | ||
493 | *dr = led_cdev; | |
494 | devres_add(parent, dr); | |
495 | ||
496 | return 0; | |
497 | } | |
b2b998c0 | 498 | EXPORT_SYMBOL_GPL(devm_led_classdev_register_ext); |
ca1bb4ee BA |
499 | |
500 | static int devm_led_classdev_match(struct device *dev, void *res, void *data) | |
501 | { | |
4b83cf07 | 502 | struct led_classdev **p = res; |
ca1bb4ee BA |
503 | |
504 | if (WARN_ON(!p || !*p)) | |
505 | return 0; | |
506 | ||
507 | return *p == data; | |
508 | } | |
509 | ||
510 | /** | |
511 | * devm_led_classdev_unregister() - resource managed led_classdev_unregister() | |
512 | * @parent: The device to unregister. | |
513 | * @led_cdev: the led_classdev structure for this device. | |
514 | */ | |
515 | void devm_led_classdev_unregister(struct device *dev, | |
516 | struct led_classdev *led_cdev) | |
517 | { | |
518 | WARN_ON(devres_release(dev, | |
519 | devm_led_classdev_release, | |
520 | devm_led_classdev_match, led_cdev)); | |
521 | } | |
522 | EXPORT_SYMBOL_GPL(devm_led_classdev_unregister); | |
523 | ||
c72a1d60 RP |
524 | static int __init leds_init(void) |
525 | { | |
526 | leds_class = class_create(THIS_MODULE, "leds"); | |
527 | if (IS_ERR(leds_class)) | |
528 | return PTR_ERR(leds_class); | |
73e1ab41 | 529 | leds_class->pm = &leds_class_dev_pm_ops; |
5baa7503 | 530 | leds_class->dev_groups = led_groups; |
c72a1d60 RP |
531 | return 0; |
532 | } | |
533 | ||
534 | static void __exit leds_exit(void) | |
535 | { | |
536 | class_destroy(leds_class); | |
537 | } | |
538 | ||
539 | subsys_initcall(leds_init); | |
540 | module_exit(leds_exit); | |
541 | ||
542 | MODULE_AUTHOR("John Lenz, Richard Purdie"); | |
543 | MODULE_LICENSE("GPL"); | |
544 | MODULE_DESCRIPTION("LED Class Interface"); |