[linux-2.6-block.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);

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;
}

static const struct dev_pm_ops leds_class_dev_pm_ops = {
	.suspend        = led_suspend,
	.resume         = 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
c72a1d60 RP	1	/*
	2	* LED Class Core
	3	*
	4	* Copyright (C) 2005 John Lenz <lenz@cs.wisc.edu>
f8a7c6fe	5	* Copyright (C) 2005-2007 Richard Purdie <rpurdie@openedhand.com>
c72a1d60 RP	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
04713306 JA	12	#include <linux/ctype.h>
	13	#include <linux/device.h>
	14	#include <linux/err.h>
c72a1d60	15	#include <linux/init.h>
04713306 JA	16	#include <linux/kernel.h>
04713306 JA	17	#include <linux/leds.h>
c72a1d60	18	#include <linux/list.h>
04713306 JA	19	#include <linux/module.h>
04713306 JA	20	#include <linux/slab.h>
c72a1d60	21	#include <linux/spinlock.h>
9067359f	22	#include <linux/timer.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
c72a1d60 RP	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	}
c72a1d60 RP	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);
872b86be SK	53	if (ret)
acd899e4	54	goto unlock;
3dc7b82e	55
872b86be SK	56	if (state == LED_OFF)
872b86be SK	57	led_trigger_remove(led_cdev);
4d71a4a1	58	led_set_brightness(led_cdev, state);
0013b23d	59
acd899e4 JA	60	ret = size;
	61	unlock:
	62	mutex_unlock(&led_cdev->led_access);
	63	return ret;
c72a1d60	64	}
5baa7503	65	static DEVICE_ATTR_RW(brightness);
c72a1d60	66
38419612	67	static ssize_t max_brightness_show(struct device *dev,
1bd465e6 GL	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	}
38419612	74	static DEVICE_ATTR_RO(max_brightness);
1bd465e6	75
c3bc9956	76	#ifdef CONFIG_LEDS_TRIGGERS
5baa7503 GKH	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,
c3bc9956	101	#endif
5baa7503	102	NULL,
14b5d6dd	103	};
c72a1d60	104
9067359f	105	static void led_timer_function(unsigned long data)
5ada28bf	106	{
9067359f	107	struct led_classdev led_cdev = (void )data;
5ada28bf JB	108	unsigned long brightness;
	109	unsigned long delay;
	110
	111	if (!led_cdev->blink_delay_on \|\| !led_cdev->blink_delay_off) {
4d71a4a1	112	led_set_brightness_async(led_cdev, LED_OFF);
5ada28bf JB	113	return;
	114	}
	115
5bb629c5 FB	116	if (led_cdev->flags & LED_BLINK_ONESHOT_STOP) {
	117	led_cdev->flags &= ~LED_BLINK_ONESHOT_STOP;
	118	return;
	119	}
	120
5ada28bf JB	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
4d71a4a1	135	led_set_brightness_async(led_cdev, brightness);
5ada28bf	136
5bb629c5 FB	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
9067359f	151	mod_timer(&led_cdev->blink_timer, jiffies + msecs_to_jiffies(delay));
5ada28bf JB	152	}
5ada28bf JB	153
d23a22a7 FB	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
4d71a4a1	161	led_set_brightness_async(led_cdev, led_cdev->delayed_set_value);
d23a22a7 FB	162	}
d23a22a7 FB	163
c72a1d60 RP	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);
7aea8389 JA	182
	183	if (led_cdev->flash_resume)
	184	led_cdev->flash_resume(led_cdev);
	185
c72a1d60 RP	186	led_cdev->flags &= ~LED_SUSPENDED;
	187	}
	188	EXPORT_SYMBOL_GPL(led_classdev_resume);
	189
73e1ab41	190	static int led_suspend(struct device *dev)
859cb7f2 RP	191	{
	192	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	193
	194	if (led_cdev->flags & LED_CORE_SUSPENDRESUME)
	195	led_classdev_suspend(led_cdev);
	196
	197	return 0;
	198	}
	199
	200	static int led_resume(struct device *dev)
	201	{
	202	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	203
	204	if (led_cdev->flags & LED_CORE_SUSPENDRESUME)
	205	led_classdev_resume(led_cdev);
	206
	207	return 0;
	208	}
	209
73e1ab41 SK	210	static const struct dev_pm_ops leds_class_dev_pm_ops = {
	211	.suspend = led_suspend,
	212	.resume = led_resume,
	213	};
	214
a96aa64c RRD	215	static int match_name(struct device dev, const void data)
	216	{
	217	if (!dev_name(dev))
	218	return 0;
	219	return !strcmp(dev_name(dev), (char *)data);
	220	}
	221
	222	static int led_classdev_next_name(const char init_name, char name,
	223	size_t len)
	224	{
	225	unsigned int i = 0;
	226	int ret = 0;
	227
	228	strlcpy(name, init_name, len);
	229
	230	while (class_find_device(leds_class, NULL, name, match_name) &&
	231	(ret < len))
	232	ret = snprintf(name, len, "%s_%u", init_name, ++i);
	233
	234	if (ret >= len)
	235	return -ENOMEM;
	236
	237	return i;
	238	}
	239
c72a1d60 RP	240	/**
c72a1d60 RP	241	* led_classdev_register - register a new object of led_classdev class.
ff8649af	242	* @parent: The device to register.
c72a1d60 RP	243	* @led_cdev: the led_classdev structure for this device.
	244	*/
	245	int led_classdev_register(struct device parent, struct led_classdev led_cdev)
	246	{
a96aa64c RRD	247	char name[64];
	248	int ret;
	249
	250	ret = led_classdev_next_name(led_cdev->name, name, sizeof(name));
	251	if (ret < 0)
	252	return ret;
	253
d0d480cc	254	led_cdev->dev = device_create_with_groups(leds_class, parent, 0,
ccdc4507	255	led_cdev, led_cdev->groups, "%s", name);
801678c5	256	if (IS_ERR(led_cdev->dev))
f8a7c6fe	257	return PTR_ERR(led_cdev->dev);
c72a1d60	258
a96aa64c	259	if (ret)
6f06c7f8	260	dev_warn(parent, "Led %s renamed to %s due to name collision",
a96aa64c RRD	261	led_cdev->name, dev_name(led_cdev->dev));
a96aa64c RRD	262
270c3957 RP	263	#ifdef CONFIG_LEDS_TRIGGERS
	264	init_rwsem(&led_cdev->trigger_lock);
	265	#endif
acd899e4	266	mutex_init(&led_cdev->led_access);
c72a1d60	267	/* add to the list of leds */
72f8da32	268	down_write(&leds_list_lock);
c72a1d60	269	list_add_tail(&led_cdev->node, &leds_list);
72f8da32	270	up_write(&leds_list_lock);
c72a1d60	271
1bd465e6 GL	272	if (!led_cdev->max_brightness)
	273	led_cdev->max_brightness = LED_FULL;
	274
4d71a4a1 JA	275	led_cdev->flags \|= SET_BRIGHTNESS_ASYNC;
4d71a4a1 JA	276
29d76dfa HMH	277	led_update_brightness(led_cdev);
29d76dfa HMH	278
d23a22a7 FB	279	INIT_WORK(&led_cdev->set_brightness_work, set_brightness_delayed);
d23a22a7 FB	280
137fe48d JL	281	setup_timer(&led_cdev->blink_timer, led_timer_function,
137fe48d JL	282	(unsigned long)led_cdev);
5ada28bf	283
c3bc9956	284	#ifdef CONFIG_LEDS_TRIGGERS
12fda168	285	led_trigger_set_default(led_cdev);
c3bc9956 RP	286	#endif
c3bc9956 RP	287
d23e7b8b	288	dev_dbg(parent, "Registered led device: %s\n",
f8a7c6fe	289	led_cdev->name);
c72a1d60 RP	290
	291	return 0;
	292	}
	293	EXPORT_SYMBOL_GPL(led_classdev_register);
	294
	295	/**
0266a458	296	* led_classdev_unregister - unregisters a object of led_properties class.
70d63ccc	297	* @led_cdev: the led device to unregister
c72a1d60 RP	298	*
	299	* Unregisters a previously registered via led_classdev_register object.
	300	*/
b844eba2	301	void led_classdev_unregister(struct led_classdev *led_cdev)
c72a1d60	302	{
c3bc9956	303	#ifdef CONFIG_LEDS_TRIGGERS
dc47206e	304	down_write(&led_cdev->trigger_lock);
c3bc9956 RP	305	if (led_cdev->trigger)
c3bc9956 RP	306	led_trigger_set(led_cdev, NULL);
dc47206e	307	up_write(&led_cdev->trigger_lock);
c3bc9956	308	#endif
c72a1d60	309
d23a22a7 FB	310	cancel_work_sync(&led_cdev->set_brightness_work);
d23a22a7 FB	311
5ada28bf	312	/* Stop blinking */
d23a22a7	313	led_stop_software_blink(led_cdev);
19cd67e2	314	led_set_brightness(led_cdev, LED_OFF);
5ada28bf	315
b844eba2	316	device_unregister(led_cdev->dev);
c72a1d60	317
72f8da32	318	down_write(&leds_list_lock);
c72a1d60	319	list_del(&led_cdev->node);
72f8da32	320	up_write(&leds_list_lock);
acd899e4 JA	321
acd899e4 JA	322	mutex_destroy(&led_cdev->led_access);
c72a1d60	323	}
b844eba2	324	EXPORT_SYMBOL_GPL(led_classdev_unregister);
c72a1d60	325
ca1bb4ee BA	326	static void devm_led_classdev_release(struct device dev, void res)
	327	{
	328	led_classdev_unregister((struct led_classdev *)res);
	329	}
	330
	331	/**
	332	* devm_led_classdev_register - resource managed led_classdev_register()
	333	* @parent: The device to register.
	334	* @led_cdev: the led_classdev structure for this device.
	335	*/
	336	int devm_led_classdev_register(struct device *parent,
	337	struct led_classdev *led_cdev)
	338	{
	339	struct led_classdev **dr;
	340	int rc;
	341
	342	dr = devres_alloc(devm_led_classdev_release, sizeof(*dr), GFP_KERNEL);
	343	if (!dr)
	344	return -ENOMEM;
	345
	346	rc = led_classdev_register(parent, led_cdev);
	347	if (rc) {
	348	devres_free(dr);
	349	return rc;
	350	}
	351
	352	*dr = led_cdev;
	353	devres_add(parent, dr);
	354
	355	return 0;
	356	}
	357	EXPORT_SYMBOL_GPL(devm_led_classdev_register);
	358
	359	static int devm_led_classdev_match(struct device dev, void res, void *data)
	360	{
	361	struct led_cdev **p = res;
	362
	363	if (WARN_ON(!p \|\| !*p))
	364	return 0;
	365
	366	return *p == data;
	367	}
	368
	369	/**
	370	* devm_led_classdev_unregister() - resource managed led_classdev_unregister()
	371	* @parent: The device to unregister.
	372	* @led_cdev: the led_classdev structure for this device.
	373	*/
	374	void devm_led_classdev_unregister(struct device *dev,
	375	struct led_classdev *led_cdev)
	376	{
	377	WARN_ON(devres_release(dev,
	378	devm_led_classdev_release,
	379	devm_led_classdev_match, led_cdev));
	380	}
	381	EXPORT_SYMBOL_GPL(devm_led_classdev_unregister);
	382
c72a1d60 RP	383	static int __init leds_init(void)
	384	{
	385	leds_class = class_create(THIS_MODULE, "leds");
	386	if (IS_ERR(leds_class))
	387	return PTR_ERR(leds_class);
73e1ab41	388	leds_class->pm = &leds_class_dev_pm_ops;
5baa7503	389	leds_class->dev_groups = led_groups;
c72a1d60 RP	390	return 0;
	391	}
	392
	393	static void __exit leds_exit(void)
	394	{
	395	class_destroy(leds_class);
	396	}
	397
	398	subsys_initcall(leds_init);
	399	module_exit(leds_exit);
	400
	401	MODULE_AUTHOR("John Lenz, Richard Purdie");
	402	MODULE_LICENSE("GPL");
	403	MODULE_DESCRIPTION("LED Class Interface");