Loading...
1/*
2 * LED Class Core
3 *
4 * Copyright (C) 2005 John Lenz <lenz@cs.wisc.edu>
5 * Copyright (C) 2005-2007 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#include <linux/module.h>
13#include <linux/kernel.h>
14#include <linux/init.h>
15#include <linux/list.h>
16#include <linux/spinlock.h>
17#include <linux/device.h>
18#include <linux/timer.h>
19#include <linux/err.h>
20#include <linux/ctype.h>
21#include <linux/leds.h>
22#include "leds.h"
23
24static struct class *leds_class;
25
26static void led_update_brightness(struct led_classdev *led_cdev)
27{
28 if (led_cdev->brightness_get)
29 led_cdev->brightness = led_cdev->brightness_get(led_cdev);
30}
31
32static ssize_t led_brightness_show(struct device *dev,
33 struct device_attribute *attr, char *buf)
34{
35 struct led_classdev *led_cdev = dev_get_drvdata(dev);
36
37 /* no lock needed for this */
38 led_update_brightness(led_cdev);
39
40 return sprintf(buf, "%u\n", led_cdev->brightness);
41}
42
43static ssize_t led_brightness_store(struct device *dev,
44 struct device_attribute *attr, const char *buf, size_t size)
45{
46 struct led_classdev *led_cdev = dev_get_drvdata(dev);
47 unsigned long state;
48 ssize_t ret = -EINVAL;
49
50 ret = kstrtoul(buf, 10, &state);
51 if (ret)
52 return ret;
53
54 if (state == LED_OFF)
55 led_trigger_remove(led_cdev);
56 led_set_brightness(led_cdev, state);
57
58 return size;
59}
60
61static ssize_t led_max_brightness_show(struct device *dev,
62 struct device_attribute *attr, char *buf)
63{
64 struct led_classdev *led_cdev = dev_get_drvdata(dev);
65
66 return sprintf(buf, "%u\n", led_cdev->max_brightness);
67}
68
69static struct device_attribute led_class_attrs[] = {
70 __ATTR(brightness, 0644, led_brightness_show, led_brightness_store),
71 __ATTR(max_brightness, 0444, led_max_brightness_show, NULL),
72#ifdef CONFIG_LEDS_TRIGGERS
73 __ATTR(trigger, 0644, led_trigger_show, led_trigger_store),
74#endif
75 __ATTR_NULL,
76};
77
78static void led_timer_function(unsigned long data)
79{
80 struct led_classdev *led_cdev = (void *)data;
81 unsigned long brightness;
82 unsigned long delay;
83
84 if (!led_cdev->blink_delay_on || !led_cdev->blink_delay_off) {
85 led_set_brightness(led_cdev, LED_OFF);
86 return;
87 }
88
89 brightness = led_get_brightness(led_cdev);
90 if (!brightness) {
91 /* Time to switch the LED on. */
92 brightness = led_cdev->blink_brightness;
93 delay = led_cdev->blink_delay_on;
94 } else {
95 /* Store the current brightness value to be able
96 * to restore it when the delay_off period is over.
97 */
98 led_cdev->blink_brightness = brightness;
99 brightness = LED_OFF;
100 delay = led_cdev->blink_delay_off;
101 }
102
103 led_set_brightness(led_cdev, brightness);
104
105 mod_timer(&led_cdev->blink_timer, jiffies + msecs_to_jiffies(delay));
106}
107
108/**
109 * led_classdev_suspend - suspend an led_classdev.
110 * @led_cdev: the led_classdev to suspend.
111 */
112void led_classdev_suspend(struct led_classdev *led_cdev)
113{
114 led_cdev->flags |= LED_SUSPENDED;
115 led_cdev->brightness_set(led_cdev, 0);
116}
117EXPORT_SYMBOL_GPL(led_classdev_suspend);
118
119/**
120 * led_classdev_resume - resume an led_classdev.
121 * @led_cdev: the led_classdev to resume.
122 */
123void led_classdev_resume(struct led_classdev *led_cdev)
124{
125 led_cdev->brightness_set(led_cdev, led_cdev->brightness);
126 led_cdev->flags &= ~LED_SUSPENDED;
127}
128EXPORT_SYMBOL_GPL(led_classdev_resume);
129
130static int led_suspend(struct device *dev, pm_message_t state)
131{
132 struct led_classdev *led_cdev = dev_get_drvdata(dev);
133
134 if (led_cdev->flags & LED_CORE_SUSPENDRESUME)
135 led_classdev_suspend(led_cdev);
136
137 return 0;
138}
139
140static int led_resume(struct device *dev)
141{
142 struct led_classdev *led_cdev = dev_get_drvdata(dev);
143
144 if (led_cdev->flags & LED_CORE_SUSPENDRESUME)
145 led_classdev_resume(led_cdev);
146
147 return 0;
148}
149
150/**
151 * led_classdev_register - register a new object of led_classdev class.
152 * @parent: The device to register.
153 * @led_cdev: the led_classdev structure for this device.
154 */
155int led_classdev_register(struct device *parent, struct led_classdev *led_cdev)
156{
157 led_cdev->dev = device_create(leds_class, parent, 0, led_cdev,
158 "%s", led_cdev->name);
159 if (IS_ERR(led_cdev->dev))
160 return PTR_ERR(led_cdev->dev);
161
162#ifdef CONFIG_LEDS_TRIGGERS
163 init_rwsem(&led_cdev->trigger_lock);
164#endif
165 /* add to the list of leds */
166 down_write(&leds_list_lock);
167 list_add_tail(&led_cdev->node, &leds_list);
168 up_write(&leds_list_lock);
169
170 if (!led_cdev->max_brightness)
171 led_cdev->max_brightness = LED_FULL;
172
173 led_update_brightness(led_cdev);
174
175 init_timer(&led_cdev->blink_timer);
176 led_cdev->blink_timer.function = led_timer_function;
177 led_cdev->blink_timer.data = (unsigned long)led_cdev;
178
179#ifdef CONFIG_LEDS_TRIGGERS
180 led_trigger_set_default(led_cdev);
181#endif
182
183 printk(KERN_DEBUG "Registered led device: %s\n",
184 led_cdev->name);
185
186 return 0;
187}
188EXPORT_SYMBOL_GPL(led_classdev_register);
189
190/**
191 * led_classdev_unregister - unregisters a object of led_properties class.
192 * @led_cdev: the led device to unregister
193 *
194 * Unregisters a previously registered via led_classdev_register object.
195 */
196void led_classdev_unregister(struct led_classdev *led_cdev)
197{
198#ifdef CONFIG_LEDS_TRIGGERS
199 down_write(&led_cdev->trigger_lock);
200 if (led_cdev->trigger)
201 led_trigger_set(led_cdev, NULL);
202 up_write(&led_cdev->trigger_lock);
203#endif
204
205 /* Stop blinking */
206 led_brightness_set(led_cdev, LED_OFF);
207
208 device_unregister(led_cdev->dev);
209
210 down_write(&leds_list_lock);
211 list_del(&led_cdev->node);
212 up_write(&leds_list_lock);
213}
214EXPORT_SYMBOL_GPL(led_classdev_unregister);
215
216static int __init leds_init(void)
217{
218 leds_class = class_create(THIS_MODULE, "leds");
219 if (IS_ERR(leds_class))
220 return PTR_ERR(leds_class);
221 leds_class->suspend = led_suspend;
222 leds_class->resume = led_resume;
223 leds_class->dev_attrs = led_class_attrs;
224 return 0;
225}
226
227static void __exit leds_exit(void)
228{
229 class_destroy(leds_class);
230}
231
232subsys_initcall(leds_init);
233module_exit(leds_exit);
234
235MODULE_AUTHOR("John Lenz, Richard Purdie");
236MODULE_LICENSE("GPL");
237MODULE_DESCRIPTION("LED Class Interface");
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * LED Class Core
4 *
5 * Copyright (C) 2005 John Lenz <lenz@cs.wisc.edu>
6 * Copyright (C) 2005-2007 Richard Purdie <rpurdie@openedhand.com>
7 */
8
9#include <linux/ctype.h>
10#include <linux/device.h>
11#include <linux/err.h>
12#include <linux/init.h>
13#include <linux/kernel.h>
14#include <linux/leds.h>
15#include <linux/list.h>
16#include <linux/module.h>
17#include <linux/property.h>
18#include <linux/slab.h>
19#include <linux/spinlock.h>
20#include <linux/timer.h>
21#include <uapi/linux/uleds.h>
22#include <linux/of.h>
23#include "leds.h"
24
25static struct class *leds_class;
26
27static ssize_t brightness_show(struct device *dev,
28 struct device_attribute *attr, char *buf)
29{
30 struct led_classdev *led_cdev = dev_get_drvdata(dev);
31
32 /* no lock needed for this */
33 led_update_brightness(led_cdev);
34
35 return sprintf(buf, "%u\n", led_cdev->brightness);
36}
37
38static ssize_t brightness_store(struct device *dev,
39 struct device_attribute *attr, const char *buf, size_t size)
40{
41 struct led_classdev *led_cdev = dev_get_drvdata(dev);
42 unsigned long state;
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 }
51
52 ret = kstrtoul(buf, 10, &state);
53 if (ret)
54 goto unlock;
55
56 if (state == LED_OFF)
57 led_trigger_remove(led_cdev);
58 led_set_brightness(led_cdev, state);
59 flush_work(&led_cdev->set_brightness_work);
60
61 ret = size;
62unlock:
63 mutex_unlock(&led_cdev->led_access);
64 return ret;
65}
66static DEVICE_ATTR_RW(brightness);
67
68static ssize_t max_brightness_show(struct device *dev,
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}
75static DEVICE_ATTR_RO(max_brightness);
76
77#ifdef CONFIG_LEDS_TRIGGERS
78static BIN_ATTR(trigger, 0644, led_trigger_read, led_trigger_write, 0);
79static struct bin_attribute *led_trigger_bin_attrs[] = {
80 &bin_attr_trigger,
81 NULL,
82};
83static const struct attribute_group led_trigger_group = {
84 .bin_attrs = led_trigger_bin_attrs,
85};
86#endif
87
88static struct attribute *led_class_attrs[] = {
89 &dev_attr_brightness.attr,
90 &dev_attr_max_brightness.attr,
91 NULL,
92};
93
94static const struct attribute_group led_group = {
95 .attrs = led_class_attrs,
96};
97
98static const struct attribute_group *led_groups[] = {
99 &led_group,
100#ifdef CONFIG_LEDS_TRIGGERS
101 &led_trigger_group,
102#endif
103 NULL,
104};
105
106#ifdef CONFIG_LEDS_BRIGHTNESS_HW_CHANGED
107static 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
118static DEVICE_ATTR_RO(brightness_hw_changed);
119
120static 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
142static 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
148void led_classdev_notify_brightness_hw_changed(struct led_classdev *led_cdev, unsigned int brightness)
149{
150 if (WARN_ON(!led_cdev->brightness_hw_changed_kn))
151 return;
152
153 led_cdev->brightness_hw_changed = brightness;
154 sysfs_notify_dirent(led_cdev->brightness_hw_changed_kn);
155}
156EXPORT_SYMBOL_GPL(led_classdev_notify_brightness_hw_changed);
157#else
158static int led_add_brightness_hw_changed(struct led_classdev *led_cdev)
159{
160 return 0;
161}
162static void led_remove_brightness_hw_changed(struct led_classdev *led_cdev)
163{
164}
165#endif
166
167/**
168 * led_classdev_suspend - suspend an led_classdev.
169 * @led_cdev: the led_classdev to suspend.
170 */
171void led_classdev_suspend(struct led_classdev *led_cdev)
172{
173 led_cdev->flags |= LED_SUSPENDED;
174 led_set_brightness_nopm(led_cdev, 0);
175 flush_work(&led_cdev->set_brightness_work);
176}
177EXPORT_SYMBOL_GPL(led_classdev_suspend);
178
179/**
180 * led_classdev_resume - resume an led_classdev.
181 * @led_cdev: the led_classdev to resume.
182 */
183void led_classdev_resume(struct led_classdev *led_cdev)
184{
185 led_set_brightness_nopm(led_cdev, led_cdev->brightness);
186
187 if (led_cdev->flash_resume)
188 led_cdev->flash_resume(led_cdev);
189
190 led_cdev->flags &= ~LED_SUSPENDED;
191}
192EXPORT_SYMBOL_GPL(led_classdev_resume);
193
194#ifdef CONFIG_PM_SLEEP
195static int led_suspend(struct device *dev)
196{
197 struct led_classdev *led_cdev = dev_get_drvdata(dev);
198
199 if (led_cdev->flags & LED_CORE_SUSPENDRESUME)
200 led_classdev_suspend(led_cdev);
201
202 return 0;
203}
204
205static int led_resume(struct device *dev)
206{
207 struct led_classdev *led_cdev = dev_get_drvdata(dev);
208
209 if (led_cdev->flags & LED_CORE_SUSPENDRESUME)
210 led_classdev_resume(led_cdev);
211
212 return 0;
213}
214#endif
215
216static SIMPLE_DEV_PM_OPS(leds_class_dev_pm_ops, led_suspend, led_resume);
217
218/**
219 * of_led_get() - request a LED device via the LED framework
220 * @np: device node to get the LED device from
221 * @index: the index of the LED
222 *
223 * Returns the LED device parsed from the phandle specified in the "leds"
224 * property of a device tree node or a negative error-code on failure.
225 */
226struct led_classdev *of_led_get(struct device_node *np, int index)
227{
228 struct device *led_dev;
229 struct led_classdev *led_cdev;
230 struct device_node *led_node;
231
232 led_node = of_parse_phandle(np, "leds", index);
233 if (!led_node)
234 return ERR_PTR(-ENOENT);
235
236 led_dev = class_find_device_by_of_node(leds_class, led_node);
237 of_node_put(led_node);
238
239 if (!led_dev)
240 return ERR_PTR(-EPROBE_DEFER);
241
242 led_cdev = dev_get_drvdata(led_dev);
243
244 if (!try_module_get(led_cdev->dev->parent->driver->owner))
245 return ERR_PTR(-ENODEV);
246
247 return led_cdev;
248}
249EXPORT_SYMBOL_GPL(of_led_get);
250
251/**
252 * led_put() - release a LED device
253 * @led_cdev: LED device
254 */
255void led_put(struct led_classdev *led_cdev)
256{
257 module_put(led_cdev->dev->parent->driver->owner);
258}
259EXPORT_SYMBOL_GPL(led_put);
260
261static void devm_led_release(struct device *dev, void *res)
262{
263 struct led_classdev **p = res;
264
265 led_put(*p);
266}
267
268/**
269 * devm_of_led_get - Resource-managed request of a LED device
270 * @dev: LED consumer
271 * @index: index of the LED to obtain in the consumer
272 *
273 * The device node of the device is parse to find the request LED device.
274 * The LED device returned from this function is automatically released
275 * on driver detach.
276 *
277 * @return a pointer to a LED device or ERR_PTR(errno) on failure.
278 */
279struct led_classdev *__must_check devm_of_led_get(struct device *dev,
280 int index)
281{
282 struct led_classdev *led;
283 struct led_classdev **dr;
284
285 if (!dev)
286 return ERR_PTR(-EINVAL);
287
288 led = of_led_get(dev->of_node, index);
289 if (IS_ERR(led))
290 return led;
291
292 dr = devres_alloc(devm_led_release, sizeof(struct led_classdev *),
293 GFP_KERNEL);
294 if (!dr) {
295 led_put(led);
296 return ERR_PTR(-ENOMEM);
297 }
298
299 *dr = led;
300 devres_add(dev, dr);
301
302 return led;
303}
304EXPORT_SYMBOL_GPL(devm_of_led_get);
305
306static int led_classdev_next_name(const char *init_name, char *name,
307 size_t len)
308{
309 unsigned int i = 0;
310 int ret = 0;
311 struct device *dev;
312
313 strlcpy(name, init_name, len);
314
315 while ((ret < len) &&
316 (dev = class_find_device_by_name(leds_class, name))) {
317 put_device(dev);
318 ret = snprintf(name, len, "%s_%u", init_name, ++i);
319 }
320
321 if (ret >= len)
322 return -ENOMEM;
323
324 return i;
325}
326
327/**
328 * led_classdev_register_ext - register a new object of led_classdev class
329 * with init data.
330 *
331 * @parent: parent of LED device
332 * @led_cdev: the led_classdev structure for this device.
333 * @init_data: LED class device initialization data
334 */
335int led_classdev_register_ext(struct device *parent,
336 struct led_classdev *led_cdev,
337 struct led_init_data *init_data)
338{
339 char composed_name[LED_MAX_NAME_SIZE];
340 char final_name[LED_MAX_NAME_SIZE];
341 const char *proposed_name = composed_name;
342 int ret;
343
344 if (init_data) {
345 if (init_data->devname_mandatory && !init_data->devicename) {
346 dev_err(parent, "Mandatory device name is missing");
347 return -EINVAL;
348 }
349 ret = led_compose_name(parent, init_data, composed_name);
350 if (ret < 0)
351 return ret;
352
353 if (init_data->fwnode) {
354 fwnode_property_read_string(init_data->fwnode,
355 "linux,default-trigger",
356 &led_cdev->default_trigger);
357
358 if (fwnode_property_present(init_data->fwnode,
359 "retain-state-shutdown"))
360 led_cdev->flags |= LED_RETAIN_AT_SHUTDOWN;
361 }
362 } else {
363 proposed_name = led_cdev->name;
364 }
365
366 ret = led_classdev_next_name(proposed_name, final_name, sizeof(final_name));
367 if (ret < 0)
368 return ret;
369
370 mutex_init(&led_cdev->led_access);
371 mutex_lock(&led_cdev->led_access);
372 led_cdev->dev = device_create_with_groups(leds_class, parent, 0,
373 led_cdev, led_cdev->groups, "%s", final_name);
374 if (IS_ERR(led_cdev->dev)) {
375 mutex_unlock(&led_cdev->led_access);
376 return PTR_ERR(led_cdev->dev);
377 }
378 if (init_data && init_data->fwnode)
379 device_set_node(led_cdev->dev, init_data->fwnode);
380
381 if (ret)
382 dev_warn(parent, "Led %s renamed to %s due to name collision",
383 proposed_name, dev_name(led_cdev->dev));
384
385 if (led_cdev->flags & LED_BRIGHT_HW_CHANGED) {
386 ret = led_add_brightness_hw_changed(led_cdev);
387 if (ret) {
388 device_unregister(led_cdev->dev);
389 led_cdev->dev = NULL;
390 mutex_unlock(&led_cdev->led_access);
391 return ret;
392 }
393 }
394
395 led_cdev->work_flags = 0;
396#ifdef CONFIG_LEDS_TRIGGERS
397 init_rwsem(&led_cdev->trigger_lock);
398#endif
399#ifdef CONFIG_LEDS_BRIGHTNESS_HW_CHANGED
400 led_cdev->brightness_hw_changed = -1;
401#endif
402 /* add to the list of leds */
403 down_write(&leds_list_lock);
404 list_add_tail(&led_cdev->node, &leds_list);
405 up_write(&leds_list_lock);
406
407 if (!led_cdev->max_brightness)
408 led_cdev->max_brightness = LED_FULL;
409
410 led_update_brightness(led_cdev);
411
412 led_init_core(led_cdev);
413
414#ifdef CONFIG_LEDS_TRIGGERS
415 led_trigger_set_default(led_cdev);
416#endif
417
418 mutex_unlock(&led_cdev->led_access);
419
420 dev_dbg(parent, "Registered led device: %s\n",
421 led_cdev->name);
422
423 return 0;
424}
425EXPORT_SYMBOL_GPL(led_classdev_register_ext);
426
427/**
428 * led_classdev_unregister - unregisters a object of led_properties class.
429 * @led_cdev: the led device to unregister
430 *
431 * Unregisters a previously registered via led_classdev_register object.
432 */
433void led_classdev_unregister(struct led_classdev *led_cdev)
434{
435 if (IS_ERR_OR_NULL(led_cdev->dev))
436 return;
437
438#ifdef CONFIG_LEDS_TRIGGERS
439 down_write(&led_cdev->trigger_lock);
440 if (led_cdev->trigger)
441 led_trigger_set(led_cdev, NULL);
442 up_write(&led_cdev->trigger_lock);
443#endif
444
445 led_cdev->flags |= LED_UNREGISTERING;
446
447 /* Stop blinking */
448 led_stop_software_blink(led_cdev);
449
450 if (!(led_cdev->flags & LED_RETAIN_AT_SHUTDOWN))
451 led_set_brightness(led_cdev, LED_OFF);
452
453 flush_work(&led_cdev->set_brightness_work);
454
455 if (led_cdev->flags & LED_BRIGHT_HW_CHANGED)
456 led_remove_brightness_hw_changed(led_cdev);
457
458 device_unregister(led_cdev->dev);
459
460 down_write(&leds_list_lock);
461 list_del(&led_cdev->node);
462 up_write(&leds_list_lock);
463
464 mutex_destroy(&led_cdev->led_access);
465}
466EXPORT_SYMBOL_GPL(led_classdev_unregister);
467
468static void devm_led_classdev_release(struct device *dev, void *res)
469{
470 led_classdev_unregister(*(struct led_classdev **)res);
471}
472
473/**
474 * devm_led_classdev_register_ext - resource managed led_classdev_register_ext()
475 *
476 * @parent: parent of LED device
477 * @led_cdev: the led_classdev structure for this device.
478 * @init_data: LED class device initialization data
479 */
480int devm_led_classdev_register_ext(struct device *parent,
481 struct led_classdev *led_cdev,
482 struct led_init_data *init_data)
483{
484 struct led_classdev **dr;
485 int rc;
486
487 dr = devres_alloc(devm_led_classdev_release, sizeof(*dr), GFP_KERNEL);
488 if (!dr)
489 return -ENOMEM;
490
491 rc = led_classdev_register_ext(parent, led_cdev, init_data);
492 if (rc) {
493 devres_free(dr);
494 return rc;
495 }
496
497 *dr = led_cdev;
498 devres_add(parent, dr);
499
500 return 0;
501}
502EXPORT_SYMBOL_GPL(devm_led_classdev_register_ext);
503
504static int devm_led_classdev_match(struct device *dev, void *res, void *data)
505{
506 struct led_classdev **p = res;
507
508 if (WARN_ON(!p || !*p))
509 return 0;
510
511 return *p == data;
512}
513
514/**
515 * devm_led_classdev_unregister() - resource managed led_classdev_unregister()
516 * @dev: The device to unregister.
517 * @led_cdev: the led_classdev structure for this device.
518 */
519void devm_led_classdev_unregister(struct device *dev,
520 struct led_classdev *led_cdev)
521{
522 WARN_ON(devres_release(dev,
523 devm_led_classdev_release,
524 devm_led_classdev_match, led_cdev));
525}
526EXPORT_SYMBOL_GPL(devm_led_classdev_unregister);
527
528static int __init leds_init(void)
529{
530 leds_class = class_create(THIS_MODULE, "leds");
531 if (IS_ERR(leds_class))
532 return PTR_ERR(leds_class);
533 leds_class->pm = &leds_class_dev_pm_ops;
534 leds_class->dev_groups = led_groups;
535 return 0;
536}
537
538static void __exit leds_exit(void)
539{
540 class_destroy(leds_class);
541}
542
543subsys_initcall(leds_init);
544module_exit(leds_exit);
545
546MODULE_AUTHOR("John Lenz, Richard Purdie");
547MODULE_LICENSE("GPL");
548MODULE_DESCRIPTION("LED Class Interface");