[deliverable/linux.git] / drivers / leds / led-class.c

/*
 * LED Class Core
 *
 * Copyright (C) 2005 John Lenz <lenz@cs.wisc.edu>
 * Copyright (C) 2005-2007 Richard Purdie <rpurdie@openedhand.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/ctype.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/leds.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/timer.h>
#include "leds.h"

static struct class *leds_class;

static ssize_t brightness_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct led_classdev *led_cdev = dev_get_drvdata(dev);

	/* no lock needed for this */
	led_update_brightness(led_cdev);

	return sprintf(buf, "%u\n", led_cdev->brightness);
}

static ssize_t brightness_store(struct device *dev,
		struct device_attribute *attr, const char *buf, size_t size)
{
	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	unsigned long state;
	ssize_t ret;

	mutex_lock(&led_cdev->led_access);

	if (led_sysfs_is_disabled(led_cdev)) {
		ret = -EBUSY;
		goto unlock;
	}

	ret = kstrtoul(buf, 10, &state);
	if (ret)
		goto unlock;

	if (state == LED_OFF)
		led_trigger_remove(led_cdev);
	led_set_brightness(led_cdev, state);

	ret = size;
unlock:
	mutex_unlock(&led_cdev->led_access);
	return ret;
}
static DEVICE_ATTR_RW(brightness);

static ssize_t max_brightness_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct led_classdev *led_cdev = dev_get_drvdata(dev);

	return sprintf(buf, "%u\n", led_cdev->max_brightness);
}
static DEVICE_ATTR_RO(max_brightness);

#ifdef CONFIG_LEDS_TRIGGERS
static DEVICE_ATTR(trigger, 0644, led_trigger_show, led_trigger_store);
static struct attribute *led_trigger_attrs[] = {
	&dev_attr_trigger.attr,
	NULL,
};
static const struct attribute_group led_trigger_group = {
	.attrs = led_trigger_attrs,
};
#endif

static struct attribute *led_class_attrs[] = {
	&dev_attr_brightness.attr,
	&dev_attr_max_brightness.attr,
	NULL,
};

static const struct attribute_group led_group = {
	.attrs = led_class_attrs,
};

static const struct attribute_group *led_groups[] = {
	&led_group,
#ifdef CONFIG_LEDS_TRIGGERS
	&led_trigger_group,
#endif
	NULL,
};

static void led_timer_function(unsigned long data)
{
	struct led_classdev *led_cdev = (void *)data;
	unsigned long brightness;
	unsigned long delay;

	if (!led_cdev->blink_delay_on || !led_cdev->blink_delay_off) {
		led_set_brightness_async(led_cdev, LED_OFF);
		return;
	}

	if (led_cdev->flags & LED_BLINK_ONESHOT_STOP) {
		led_cdev->flags &= ~LED_BLINK_ONESHOT_STOP;
		return;
	}

	brightness = led_get_brightness(led_cdev);
	if (!brightness) {
		/* Time to switch the LED on. */
		brightness = led_cdev->blink_brightness;
		delay = led_cdev->blink_delay_on;
	} else {
		/* Store the current brightness value to be able
		 * to restore it when the delay_off period is over.
		 */
		led_cdev->blink_brightness = brightness;
		brightness = LED_OFF;
		delay = led_cdev->blink_delay_off;
	}

	led_set_brightness_async(led_cdev, brightness);

	/* Return in next iteration if led is in one-shot mode and we are in
	 * the final blink state so that the led is toggled each delay_on +
	 * delay_off milliseconds in worst case.
	 */
	if (led_cdev->flags & LED_BLINK_ONESHOT) {
		if (led_cdev->flags & LED_BLINK_INVERT) {
			if (brightness)
				led_cdev->flags |= LED_BLINK_ONESHOT_STOP;
		} else {
			if (!brightness)
				led_cdev->flags |= LED_BLINK_ONESHOT_STOP;
		}
	}

	mod_timer(&led_cdev->blink_timer, jiffies + msecs_to_jiffies(delay));
}

static void set_brightness_delayed(struct work_struct *ws)
{
	struct led_classdev *led_cdev =
		container_of(ws, struct led_classdev, set_brightness_work);

	led_stop_software_blink(led_cdev);

	led_set_brightness_async(led_cdev, led_cdev->delayed_set_value);
}

/**
 * led_classdev_suspend - suspend an led_classdev.
 * @led_cdev: the led_classdev to suspend.
 */
void led_classdev_suspend(struct led_classdev *led_cdev)
{
	led_cdev->flags |= LED_SUSPENDED;
	led_cdev->brightness_set(led_cdev, 0);
}
EXPORT_SYMBOL_GPL(led_classdev_suspend);

/**
 * led_classdev_resume - resume an led_classdev.
 * @led_cdev: the led_classdev to resume.
 */
void led_classdev_resume(struct led_classdev *led_cdev)
{
	led_cdev->brightness_set(led_cdev, led_cdev->brightness);

	if (led_cdev->flash_resume)
		led_cdev->flash_resume(led_cdev);

	led_cdev->flags &= ~LED_SUSPENDED;
}
EXPORT_SYMBOL_GPL(led_classdev_resume);

#ifdef CONFIG_PM_SLEEP
static int led_suspend(struct device *dev)
{
	struct led_classdev *led_cdev = dev_get_drvdata(dev);

	if (led_cdev->flags & LED_CORE_SUSPENDRESUME)
		led_classdev_suspend(led_cdev);

	return 0;
}

static int led_resume(struct device *dev)
{
	struct led_classdev *led_cdev = dev_get_drvdata(dev);

	if (led_cdev->flags & LED_CORE_SUSPENDRESUME)
		led_classdev_resume(led_cdev);

	return 0;
}
#endif

static SIMPLE_DEV_PM_OPS(leds_class_dev_pm_ops, led_suspend, led_resume);

static int match_name(struct device *dev, const void *data)
{
	if (!dev_name(dev))
		return 0;
	return !strcmp(dev_name(dev), (char *)data);
}

static int led_classdev_next_name(const char *init_name, char *name,
				  size_t len)
{
	unsigned int i = 0;
	int ret = 0;

	strlcpy(name, init_name, len);

	while (class_find_device(leds_class, NULL, name, match_name) &&
	       (ret < len))
		ret = snprintf(name, len, "%s_%u", init_name, ++i);

	if (ret >= len)
		return -ENOMEM;

	return i;
}

/**
 * led_classdev_register - register a new object of led_classdev class.
 * @parent: The device to register.
 * @led_cdev: the led_classdev structure for this device.
 */
int led_classdev_register(struct device *parent, struct led_classdev *led_cdev)
{
	char name[64];
	int ret;

	ret = led_classdev_next_name(led_cdev->name, name, sizeof(name));
	if (ret < 0)
		return ret;

	led_cdev->dev = device_create_with_groups(leds_class, parent, 0,
				led_cdev, led_cdev->groups, "%s", name);
	if (IS_ERR(led_cdev->dev))
		return PTR_ERR(led_cdev->dev);

	if (ret)
		dev_warn(parent, "Led %s renamed to %s due to name collision",
				led_cdev->name, dev_name(led_cdev->dev));

#ifdef CONFIG_LEDS_TRIGGERS
	init_rwsem(&led_cdev->trigger_lock);
#endif
	mutex_init(&led_cdev->led_access);
	/* add to the list of leds */
	down_write(&leds_list_lock);
	list_add_tail(&led_cdev->node, &leds_list);
	up_write(&leds_list_lock);

	if (!led_cdev->max_brightness)
		led_cdev->max_brightness = LED_FULL;

	led_cdev->flags |= SET_BRIGHTNESS_ASYNC;

	led_update_brightness(led_cdev);

	INIT_WORK(&led_cdev->set_brightness_work, set_brightness_delayed);

	setup_timer(&led_cdev->blink_timer, led_timer_function,
		    (unsigned long)led_cdev);

#ifdef CONFIG_LEDS_TRIGGERS
	led_trigger_set_default(led_cdev);
#endif

	dev_dbg(parent, "Registered led device: %s\n",
			led_cdev->name);

	return 0;
}
EXPORT_SYMBOL_GPL(led_classdev_register);

/**
 * led_classdev_unregister - unregisters a object of led_properties class.
 * @led_cdev: the led device to unregister
 *
 * Unregisters a previously registered via led_classdev_register object.
 */
void led_classdev_unregister(struct led_classdev *led_cdev)
{
#ifdef CONFIG_LEDS_TRIGGERS
	down_write(&led_cdev->trigger_lock);
	if (led_cdev->trigger)
		led_trigger_set(led_cdev, NULL);
	up_write(&led_cdev->trigger_lock);
#endif

	cancel_work_sync(&led_cdev->set_brightness_work);

	/* Stop blinking */
	led_stop_software_blink(led_cdev);
	led_set_brightness(led_cdev, LED_OFF);

	device_unregister(led_cdev->dev);

	down_write(&leds_list_lock);
	list_del(&led_cdev->node);
	up_write(&leds_list_lock);

	mutex_destroy(&led_cdev->led_access);
}
EXPORT_SYMBOL_GPL(led_classdev_unregister);

static void devm_led_classdev_release(struct device *dev, void *res)
{
	led_classdev_unregister(*(struct led_classdev **)res);
}

/**
 * devm_led_classdev_register - resource managed led_classdev_register()
 * @parent: The device to register.
 * @led_cdev: the led_classdev structure for this device.
 */
int devm_led_classdev_register(struct device *parent,
			       struct led_classdev *led_cdev)
{
	struct led_classdev **dr;
	int rc;

	dr = devres_alloc(devm_led_classdev_release, sizeof(*dr), GFP_KERNEL);
	if (!dr)
		return -ENOMEM;

	rc = led_classdev_register(parent, led_cdev);
	if (rc) {
		devres_free(dr);
		return rc;
	}

	*dr = led_cdev;
	devres_add(parent, dr);

	return 0;
}
EXPORT_SYMBOL_GPL(devm_led_classdev_register);

static int devm_led_classdev_match(struct device *dev, void *res, void *data)
{
	struct led_cdev **p = res;

	if (WARN_ON(!p || !*p))
		return 0;

	return *p == data;
}

/**
 * devm_led_classdev_unregister() - resource managed led_classdev_unregister()
 * @parent: The device to unregister.
 * @led_cdev: the led_classdev structure for this device.
 */
void devm_led_classdev_unregister(struct device *dev,
				  struct led_classdev *led_cdev)
{
	WARN_ON(devres_release(dev,
			       devm_led_classdev_release,
			       devm_led_classdev_match, led_cdev));
}
EXPORT_SYMBOL_GPL(devm_led_classdev_unregister);

static int __init leds_init(void)
{
	leds_class = class_create(THIS_MODULE, "leds");
	if (IS_ERR(leds_class))
		return PTR_ERR(leds_class);
	leds_class->pm = &leds_class_dev_pm_ops;
	leds_class->dev_groups = led_groups;
	return 0;
}

static void __exit leds_exit(void)
{
	class_destroy(leds_class);
}

subsys_initcall(leds_init);
module_exit(leds_exit);

MODULE_AUTHOR("John Lenz, Richard Purdie");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("LED Class Interface");
Commit	Line	Data
	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/ctype.h>
	13	#include <linux/device.h>
	14	#include <linux/err.h>
	15	#include <linux/init.h>
	16	#include <linux/kernel.h>
	17	#include <linux/leds.h>
	18	#include <linux/list.h>
	19	#include <linux/module.h>
	20	#include <linux/slab.h>
	21	#include <linux/spinlock.h>
	22	#include <linux/timer.h>
	23	#include "leds.h"
	24
	25	static struct class *leds_class;
	26
	27	static 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
	38	static 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
	60	ret = size;
	61	unlock:
	62	mutex_unlock(&led_cdev->led_access);
	63	return ret;
	64	}
	65	static DEVICE_ATTR_RW(brightness);
	66
	67	static ssize_t max_brightness_show(struct device *dev,
	68	struct device_attribute attr, char buf)
	69	{
	70	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	71
	72	return sprintf(buf, "%u\n", led_cdev->max_brightness);
	73	}
	74	static DEVICE_ATTR_RO(max_brightness);
	75
	76	#ifdef CONFIG_LEDS_TRIGGERS
	77	static DEVICE_ATTR(trigger, 0644, led_trigger_show, led_trigger_store);
	78	static struct attribute *led_trigger_attrs[] = {
	79	&dev_attr_trigger.attr,
	80	NULL,
	81	};
	82	static const struct attribute_group led_trigger_group = {
	83	.attrs = led_trigger_attrs,
	84	};
	85	#endif
	86
	87	static struct attribute *led_class_attrs[] = {
	88	&dev_attr_brightness.attr,
	89	&dev_attr_max_brightness.attr,
	90	NULL,
	91	};
	92
	93	static const struct attribute_group led_group = {
	94	.attrs = led_class_attrs,
	95	};
	96
	97	static const struct attribute_group *led_groups[] = {
	98	&led_group,
	99	#ifdef CONFIG_LEDS_TRIGGERS
	100	&led_trigger_group,
	101	#endif
	102	NULL,
	103	};
	104
	105	static void led_timer_function(unsigned long data)
	106	{
	107	struct led_classdev led_cdev = (void )data;
	108	unsigned long brightness;
	109	unsigned long delay;
	110
	111	if (!led_cdev->blink_delay_on \|\| !led_cdev->blink_delay_off) {
	112	led_set_brightness_async(led_cdev, LED_OFF);
	113	return;
	114	}
	115
	116	if (led_cdev->flags & LED_BLINK_ONESHOT_STOP) {
	117	led_cdev->flags &= ~LED_BLINK_ONESHOT_STOP;
	118	return;
	119	}
	120
	121	brightness = led_get_brightness(led_cdev);
	122	if (!brightness) {
	123	/* Time to switch the LED on. */
	124	brightness = led_cdev->blink_brightness;
	125	delay = led_cdev->blink_delay_on;
	126	} else {
	127	/* Store the current brightness value to be able
	128	* to restore it when the delay_off period is over.
	129	*/
	130	led_cdev->blink_brightness = brightness;
	131	brightness = LED_OFF;
	132	delay = led_cdev->blink_delay_off;
	133	}
	134
	135	led_set_brightness_async(led_cdev, brightness);
	136
	137	/* Return in next iteration if led is in one-shot mode and we are in
	138	* the final blink state so that the led is toggled each delay_on +
	139	* delay_off milliseconds in worst case.
	140	*/
	141	if (led_cdev->flags & LED_BLINK_ONESHOT) {
	142	if (led_cdev->flags & LED_BLINK_INVERT) {
	143	if (brightness)
	144	led_cdev->flags \|= LED_BLINK_ONESHOT_STOP;
	145	} else {
	146	if (!brightness)
	147	led_cdev->flags \|= LED_BLINK_ONESHOT_STOP;
	148	}
	149	}
	150
	151	mod_timer(&led_cdev->blink_timer, jiffies + msecs_to_jiffies(delay));
	152	}
	153
	154	static void set_brightness_delayed(struct work_struct *ws)
	155	{
	156	struct led_classdev *led_cdev =
	157	container_of(ws, struct led_classdev, set_brightness_work);
	158
	159	led_stop_software_blink(led_cdev);
	160
	161	led_set_brightness_async(led_cdev, led_cdev->delayed_set_value);
	162	}
	163
	164	/**
	165	* led_classdev_suspend - suspend an led_classdev.
	166	* @led_cdev: the led_classdev to suspend.
	167	*/
	168	void led_classdev_suspend(struct led_classdev *led_cdev)
	169	{
	170	led_cdev->flags \|= LED_SUSPENDED;
	171	led_cdev->brightness_set(led_cdev, 0);
	172	}
	173	EXPORT_SYMBOL_GPL(led_classdev_suspend);
	174
	175	/**
	176	* led_classdev_resume - resume an led_classdev.
	177	* @led_cdev: the led_classdev to resume.
	178	*/
	179	void led_classdev_resume(struct led_classdev *led_cdev)
	180	{
	181	led_cdev->brightness_set(led_cdev, led_cdev->brightness);
	182
	183	if (led_cdev->flash_resume)
	184	led_cdev->flash_resume(led_cdev);
	185
	186	led_cdev->flags &= ~LED_SUSPENDED;
	187	}
	188	EXPORT_SYMBOL_GPL(led_classdev_resume);
	189
	190	#ifdef CONFIG_PM_SLEEP
	191	static int led_suspend(struct device *dev)
	192	{
	193	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	194
	195	if (led_cdev->flags & LED_CORE_SUSPENDRESUME)
	196	led_classdev_suspend(led_cdev);
	197
	198	return 0;
	199	}
	200
	201	static int led_resume(struct device *dev)
	202	{
	203	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	204
	205	if (led_cdev->flags & LED_CORE_SUSPENDRESUME)
	206	led_classdev_resume(led_cdev);
	207
	208	return 0;
	209	}
	210	#endif
	211
	212	static SIMPLE_DEV_PM_OPS(leds_class_dev_pm_ops, led_suspend, led_resume);
	213
	214	static int match_name(struct device dev, const void data)
	215	{
	216	if (!dev_name(dev))
	217	return 0;
	218	return !strcmp(dev_name(dev), (char *)data);
	219	}
	220
	221	static int led_classdev_next_name(const char init_name, char name,
	222	size_t len)
	223	{
	224	unsigned int i = 0;
	225	int ret = 0;
	226
	227	strlcpy(name, init_name, len);
	228
	229	while (class_find_device(leds_class, NULL, name, match_name) &&
	230	(ret < len))
	231	ret = snprintf(name, len, "%s_%u", init_name, ++i);
	232
	233	if (ret >= len)
	234	return -ENOMEM;
	235
	236	return i;
	237	}
	238
	239	/**
	240	* led_classdev_register - register a new object of led_classdev class.
	241	* @parent: The device to register.
	242	* @led_cdev: the led_classdev structure for this device.
	243	*/
	244	int led_classdev_register(struct device parent, struct led_classdev led_cdev)
	245	{
	246	char name[64];
	247	int ret;
	248
	249	ret = led_classdev_next_name(led_cdev->name, name, sizeof(name));
	250	if (ret < 0)
	251	return ret;
	252
	253	led_cdev->dev = device_create_with_groups(leds_class, parent, 0,
	254	led_cdev, led_cdev->groups, "%s", name);
	255	if (IS_ERR(led_cdev->dev))
	256	return PTR_ERR(led_cdev->dev);
	257
	258	if (ret)
	259	dev_warn(parent, "Led %s renamed to %s due to name collision",
	260	led_cdev->name, dev_name(led_cdev->dev));
	261
	262	#ifdef CONFIG_LEDS_TRIGGERS
	263	init_rwsem(&led_cdev->trigger_lock);
	264	#endif
	265	mutex_init(&led_cdev->led_access);
	266	/* add to the list of leds */
	267	down_write(&leds_list_lock);
	268	list_add_tail(&led_cdev->node, &leds_list);
	269	up_write(&leds_list_lock);
	270
	271	if (!led_cdev->max_brightness)
	272	led_cdev->max_brightness = LED_FULL;
	273
	274	led_cdev->flags \|= SET_BRIGHTNESS_ASYNC;
	275
	276	led_update_brightness(led_cdev);
	277
	278	INIT_WORK(&led_cdev->set_brightness_work, set_brightness_delayed);
	279
	280	setup_timer(&led_cdev->blink_timer, led_timer_function,
	281	(unsigned long)led_cdev);
	282
	283	#ifdef CONFIG_LEDS_TRIGGERS
	284	led_trigger_set_default(led_cdev);
	285	#endif
	286
	287	dev_dbg(parent, "Registered led device: %s\n",
	288	led_cdev->name);
	289
	290	return 0;
	291	}
	292	EXPORT_SYMBOL_GPL(led_classdev_register);
	293
	294	/**
	295	* led_classdev_unregister - unregisters a object of led_properties class.
	296	* @led_cdev: the led device to unregister
	297	*
	298	* Unregisters a previously registered via led_classdev_register object.
	299	*/
	300	void led_classdev_unregister(struct led_classdev *led_cdev)
	301	{
	302	#ifdef CONFIG_LEDS_TRIGGERS
	303	down_write(&led_cdev->trigger_lock);
	304	if (led_cdev->trigger)
	305	led_trigger_set(led_cdev, NULL);
	306	up_write(&led_cdev->trigger_lock);
	307	#endif
	308
	309	cancel_work_sync(&led_cdev->set_brightness_work);
	310
	311	/* Stop blinking */
	312	led_stop_software_blink(led_cdev);
	313	led_set_brightness(led_cdev, LED_OFF);
	314
	315	device_unregister(led_cdev->dev);
	316
	317	down_write(&leds_list_lock);
	318	list_del(&led_cdev->node);
	319	up_write(&leds_list_lock);
	320
	321	mutex_destroy(&led_cdev->led_access);
	322	}
	323	EXPORT_SYMBOL_GPL(led_classdev_unregister);
	324
	325	static void devm_led_classdev_release(struct device dev, void res)
	326	{
	327	led_classdev_unregister((struct led_classdev *)res);
	328	}
	329
	330	/**
	331	* devm_led_classdev_register - resource managed led_classdev_register()
	332	* @parent: The device to register.
	333	* @led_cdev: the led_classdev structure for this device.
	334	*/
	335	int devm_led_classdev_register(struct device *parent,
	336	struct led_classdev *led_cdev)
	337	{
	338	struct led_classdev **dr;
	339	int rc;
	340
	341	dr = devres_alloc(devm_led_classdev_release, sizeof(*dr), GFP_KERNEL);
	342	if (!dr)
	343	return -ENOMEM;
	344
	345	rc = led_classdev_register(parent, led_cdev);
	346	if (rc) {
	347	devres_free(dr);
	348	return rc;
	349	}
	350
	351	*dr = led_cdev;
	352	devres_add(parent, dr);
	353
	354	return 0;
	355	}
	356	EXPORT_SYMBOL_GPL(devm_led_classdev_register);
	357
	358	static int devm_led_classdev_match(struct device dev, void res, void *data)
	359	{
	360	struct led_cdev **p = res;
	361
	362	if (WARN_ON(!p \|\| !*p))
	363	return 0;
	364
	365	return *p == data;
	366	}
	367
	368	/**
	369	* devm_led_classdev_unregister() - resource managed led_classdev_unregister()
	370	* @parent: The device to unregister.
	371	* @led_cdev: the led_classdev structure for this device.
	372	*/
	373	void devm_led_classdev_unregister(struct device *dev,
	374	struct led_classdev *led_cdev)
	375	{
	376	WARN_ON(devres_release(dev,
	377	devm_led_classdev_release,
	378	devm_led_classdev_match, led_cdev));
	379	}
	380	EXPORT_SYMBOL_GPL(devm_led_classdev_unregister);
	381
	382	static int __init leds_init(void)
	383	{
	384	leds_class = class_create(THIS_MODULE, "leds");
	385	if (IS_ERR(leds_class))
	386	return PTR_ERR(leds_class);
	387	leds_class->pm = &leds_class_dev_pm_ops;
	388	leds_class->dev_groups = led_groups;
	389	return 0;
	390	}
	391
	392	static void __exit leds_exit(void)
	393	{
	394	class_destroy(leds_class);
	395	}
	396
	397	subsys_initcall(leds_init);
	398	module_exit(leds_exit);
	399
	400	MODULE_AUTHOR("John Lenz, Richard Purdie");
	401	MODULE_LICENSE("GPL");
	402	MODULE_DESCRIPTION("LED Class Interface");