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

// SPDX-License-Identifier: GPL-2.0-only
/*
 * LED Class Core
 *
 * Copyright (C) 2005 John Lenz <lenz@cs.wisc.edu>
 * Copyright (C) 2005-2007 Richard Purdie <rpurdie@openedhand.com>
 */

#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/of.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/timer.h>
#include <uapi/linux/uleds.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);
	flush_work(&led_cdev->set_brightness_work);

	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,
};

#ifdef CONFIG_LEDS_BRIGHTNESS_HW_CHANGED
static ssize_t brightness_hw_changed_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct led_classdev *led_cdev = dev_get_drvdata(dev);

	if (led_cdev->brightness_hw_changed == -1)
		return -ENODATA;

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

static DEVICE_ATTR_RO(brightness_hw_changed);

static int led_add_brightness_hw_changed(struct led_classdev *led_cdev)
{
	struct device *dev = led_cdev->dev;
	int ret;

	ret = device_create_file(dev, &dev_attr_brightness_hw_changed);
	if (ret) {
		dev_err(dev, "Error creating brightness_hw_changed\n");
		return ret;
	}

	led_cdev->brightness_hw_changed_kn =
		sysfs_get_dirent(dev->kobj.sd, "brightness_hw_changed");
	if (!led_cdev->brightness_hw_changed_kn) {
		dev_err(dev, "Error getting brightness_hw_changed kn\n");
		device_remove_file(dev, &dev_attr_brightness_hw_changed);
		return -ENXIO;
	}

	return 0;
}

static void led_remove_brightness_hw_changed(struct led_classdev *led_cdev)
{
	sysfs_put(led_cdev->brightness_hw_changed_kn);
	device_remove_file(led_cdev->dev, &dev_attr_brightness_hw_changed);
}

void led_classdev_notify_brightness_hw_changed(struct led_classdev *led_cdev,
					       enum led_brightness brightness)
{
	if (WARN_ON(!led_cdev->brightness_hw_changed_kn))
		return;

	led_cdev->brightness_hw_changed = brightness;
	sysfs_notify_dirent(led_cdev->brightness_hw_changed_kn);
}
EXPORT_SYMBOL_GPL(led_classdev_notify_brightness_hw_changed);
#else
static int led_add_brightness_hw_changed(struct led_classdev *led_cdev)
{
	return 0;
}
static void led_remove_brightness_hw_changed(struct led_classdev *led_cdev)
{
}
#endif

/**
 * 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_set_brightness_nopm(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_set_brightness_nopm(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;
	struct device *dev;

	strlcpy(name, init_name, len);

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

	if (ret >= len)
		return -ENOMEM;

	return i;
}

/**
 * led_classdev_register_ext - register a new object of led_classdev class
 *			       with init data.
 *
 * @parent: parent of LED device
 * @led_cdev: the led_classdev structure for this device.
 * @init_data: LED class device initialization data
 */
int led_classdev_register_ext(struct device *parent,
			      struct led_classdev *led_cdev,
			      struct led_init_data *init_data)
{
	char name[LED_MAX_NAME_SIZE];
	int ret;

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

	mutex_init(&led_cdev->led_access);
	mutex_lock(&led_cdev->led_access);
	led_cdev->dev = device_create_with_groups(leds_class, parent, 0,
				led_cdev, led_cdev->groups, "%s", name);
	if (IS_ERR(led_cdev->dev)) {
		mutex_unlock(&led_cdev->led_access);
		return PTR_ERR(led_cdev->dev);
	}
	if (init_data && init_data->fwnode)
		led_cdev->dev->of_node = to_of_node(init_data->fwnode);

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

	if (led_cdev->flags & LED_BRIGHT_HW_CHANGED) {
		ret = led_add_brightness_hw_changed(led_cdev);
		if (ret) {
			device_unregister(led_cdev->dev);
			mutex_unlock(&led_cdev->led_access);
			return ret;
		}
	}

	led_cdev->work_flags = 0;
#ifdef CONFIG_LEDS_TRIGGERS
	init_rwsem(&led_cdev->trigger_lock);
#endif
#ifdef CONFIG_LEDS_BRIGHTNESS_HW_CHANGED
	led_cdev->brightness_hw_changed = -1;
#endif
	/* 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_update_brightness(led_cdev);

	led_init_core(led_cdev);

#ifdef CONFIG_LEDS_TRIGGERS
	led_trigger_set_default(led_cdev);
#endif

	mutex_unlock(&led_cdev->led_access);

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

	return 0;
}
EXPORT_SYMBOL_GPL(led_classdev_register_ext);

/**
 * 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

	led_cdev->flags |= LED_UNREGISTERING;

	/* Stop blinking */
	led_stop_software_blink(led_cdev);

	led_set_brightness(led_cdev, LED_OFF);

	flush_work(&led_cdev->set_brightness_work);

	if (led_cdev->flags & LED_BRIGHT_HW_CHANGED)
		led_remove_brightness_hw_changed(led_cdev);

	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_ext - resource managed led_classdev_register_ext()
 *
 * @parent: parent of LED device
 * @led_cdev: the led_classdev structure for this device.
 * @init_data: LED class device initialization data
 */
int devm_led_classdev_register_ext(struct device *parent,
				   struct led_classdev *led_cdev,
				   struct led_init_data *init_data)
{
	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_ext(parent, led_cdev, init_data);
	if (rc) {
		devres_free(dr);
		return rc;
	}

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

	return 0;
}
EXPORT_SYMBOL_GPL(devm_led_classdev_register_ext);

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
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	*/
c72a1d60 RP	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>
04713306 JA	14	#include <linux/leds.h>
c72a1d60	15	#include <linux/list.h>
04713306	16	#include <linux/module.h>
b2b998c0	17	#include <linux/of.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>
c72a1d60 RP	22	#include "leds.h"
	23
	24	static struct class *leds_class;
	25
5baa7503	26	static ssize_t brightness_show(struct device *dev,
f8a7c6fe	27	struct device_attribute attr, char buf)
c72a1d60	28	{
f8a7c6fe	29	struct led_classdev *led_cdev = dev_get_drvdata(dev);
c72a1d60 RP	30
c72a1d60 RP	31	/* no lock needed for this */
29d76dfa	32	led_update_brightness(led_cdev);
c72a1d60	33
dd8e5a20	34	return sprintf(buf, "%u\n", led_cdev->brightness);
c72a1d60 RP	35	}
c72a1d60 RP	36
5baa7503	37	static ssize_t brightness_store(struct device *dev,
f8a7c6fe	38	struct device_attribute attr, const char buf, size_t size)
c72a1d60	39	{
f8a7c6fe	40	struct led_classdev *led_cdev = dev_get_drvdata(dev);
872b86be	41	unsigned long state;
acd899e4 JA	42	ssize_t ret;
	43
	44	mutex_lock(&led_cdev->led_access);
	45
	46	if (led_sysfs_is_disabled(led_cdev)) {
	47	ret = -EBUSY;
	48	goto unlock;
	49	}
c72a1d60	50
872b86be SK	51	ret = kstrtoul(buf, 10, &state);
872b86be SK	52	if (ret)
acd899e4	53	goto unlock;
3dc7b82e	54
872b86be SK	55	if (state == LED_OFF)
872b86be SK	56	led_trigger_remove(led_cdev);
4d71a4a1	57	led_set_brightness(led_cdev, state);
0db37915	58	flush_work(&led_cdev->set_brightness_work);
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
0cb8eb30 HG	105	#ifdef CONFIG_LEDS_BRIGHTNESS_HW_CHANGED
	106	static ssize_t brightness_hw_changed_show(struct device *dev,
	107	struct device_attribute attr, char buf)
	108	{
	109	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	110
	111	if (led_cdev->brightness_hw_changed == -1)
	112	return -ENODATA;
	113
	114	return sprintf(buf, "%u\n", led_cdev->brightness_hw_changed);
	115	}
	116
	117	static DEVICE_ATTR_RO(brightness_hw_changed);
	118
	119	static int led_add_brightness_hw_changed(struct led_classdev *led_cdev)
	120	{
	121	struct device *dev = led_cdev->dev;
	122	int ret;
	123
	124	ret = device_create_file(dev, &dev_attr_brightness_hw_changed);
	125	if (ret) {
	126	dev_err(dev, "Error creating brightness_hw_changed\n");
	127	return ret;
	128	}
	129
	130	led_cdev->brightness_hw_changed_kn =
	131	sysfs_get_dirent(dev->kobj.sd, "brightness_hw_changed");
	132	if (!led_cdev->brightness_hw_changed_kn) {
	133	dev_err(dev, "Error getting brightness_hw_changed kn\n");
	134	device_remove_file(dev, &dev_attr_brightness_hw_changed);
	135	return -ENXIO;
	136	}
	137
	138	return 0;
	139	}
	140
	141	static void led_remove_brightness_hw_changed(struct led_classdev *led_cdev)
	142	{
	143	sysfs_put(led_cdev->brightness_hw_changed_kn);
	144	device_remove_file(led_cdev->dev, &dev_attr_brightness_hw_changed);
	145	}
	146
	147	void led_classdev_notify_brightness_hw_changed(struct led_classdev *led_cdev,
	148	enum led_brightness 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	}
	156	EXPORT_SYMBOL_GPL(led_classdev_notify_brightness_hw_changed);
	157	#else
	158	static int led_add_brightness_hw_changed(struct led_classdev *led_cdev)
	159	{
	160	return 0;
	161	}
	162	static void led_remove_brightness_hw_changed(struct led_classdev *led_cdev)
	163	{
	164	}
	165	#endif
	166
c72a1d60 RP	167	/**
	168	* led_classdev_suspend - suspend an led_classdev.
	169	* @led_cdev: the led_classdev to suspend.
	170	*/
	171	void led_classdev_suspend(struct led_classdev *led_cdev)
	172	{
	173	led_cdev->flags \|= LED_SUSPENDED;
81fe8e5b	174	led_set_brightness_nopm(led_cdev, 0);
c72a1d60 RP	175	}
	176	EXPORT_SYMBOL_GPL(led_classdev_suspend);
	177
	178	/**
	179	* led_classdev_resume - resume an led_classdev.
	180	* @led_cdev: the led_classdev to resume.
	181	*/
	182	void led_classdev_resume(struct led_classdev *led_cdev)
	183	{
81fe8e5b	184	led_set_brightness_nopm(led_cdev, led_cdev->brightness);
7aea8389 JA	185
	186	if (led_cdev->flash_resume)
	187	led_cdev->flash_resume(led_cdev);
	188
c72a1d60 RP	189	led_cdev->flags &= ~LED_SUSPENDED;
	190	}
	191	EXPORT_SYMBOL_GPL(led_classdev_resume);
	192
084609bf	193	#ifdef CONFIG_PM_SLEEP
73e1ab41	194	static int led_suspend(struct device *dev)
859cb7f2 RP	195	{
	196	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	197
	198	if (led_cdev->flags & LED_CORE_SUSPENDRESUME)
	199	led_classdev_suspend(led_cdev);
	200
	201	return 0;
	202	}
	203
	204	static int led_resume(struct device *dev)
	205	{
	206	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	207
	208	if (led_cdev->flags & LED_CORE_SUSPENDRESUME)
	209	led_classdev_resume(led_cdev);
	210
	211	return 0;
	212	}
084609bf	213	#endif
859cb7f2	214
084609bf	215	static SIMPLE_DEV_PM_OPS(leds_class_dev_pm_ops, led_suspend, led_resume);
73e1ab41	216
a96aa64c RRD	217	static int match_name(struct device dev, const void data)
	218	{
	219	if (!dev_name(dev))
	220	return 0;
	221	return !strcmp(dev_name(dev), (char *)data);
	222	}
	223
	224	static int led_classdev_next_name(const char init_name, char name,
	225	size_t len)
	226	{
	227	unsigned int i = 0;
	228	int ret = 0;
e5b5a61f	229	struct device *dev;
a96aa64c RRD	230
	231	strlcpy(name, init_name, len);
	232
e5b5a61f RRD	233	while ((ret < len) &&
	234	(dev = class_find_device(leds_class, NULL, name, match_name))) {
	235	put_device(dev);
a96aa64c	236	ret = snprintf(name, len, "%s_%u", init_name, ++i);
e5b5a61f	237	}
a96aa64c RRD	238
	239	if (ret >= len)
	240	return -ENOMEM;
	241
	242	return i;
	243	}
	244
c72a1d60	245	/**
b2b998c0 JA	246	* led_classdev_register_ext - register a new object of led_classdev class
b2b998c0 JA	247	* with init data.
442c6098 RM	248	*
442c6098 RM	249	* @parent: parent of LED device
c72a1d60	250	* @led_cdev: the led_classdev structure for this device.
b2b998c0	251	* @init_data: LED class device initialization data
c72a1d60	252	*/
b2b998c0 JA	253	int led_classdev_register_ext(struct device *parent,
	254	struct led_classdev *led_cdev,
	255	struct led_init_data *init_data)
c72a1d60	256	{
eb1ce746	257	char name[LED_MAX_NAME_SIZE];
a96aa64c RRD	258	int ret;
	259
	260	ret = led_classdev_next_name(led_cdev->name, name, sizeof(name));
	261	if (ret < 0)
	262	return ret;
	263
6d71021a LH	264	mutex_init(&led_cdev->led_access);
6d71021a LH	265	mutex_lock(&led_cdev->led_access);
d0d480cc	266	led_cdev->dev = device_create_with_groups(leds_class, parent, 0,
ccdc4507	267	led_cdev, led_cdev->groups, "%s", name);
6d71021a LH	268	if (IS_ERR(led_cdev->dev)) {
6d71021a LH	269	mutex_unlock(&led_cdev->led_access);
f8a7c6fe	270	return PTR_ERR(led_cdev->dev);
6d71021a	271	}
b2b998c0 JA	272	if (init_data && init_data->fwnode)
b2b998c0 JA	273	led_cdev->dev->of_node = to_of_node(init_data->fwnode);
c72a1d60	274
a96aa64c	275	if (ret)
6f06c7f8	276	dev_warn(parent, "Led %s renamed to %s due to name collision",
a96aa64c RRD	277	led_cdev->name, dev_name(led_cdev->dev));
a96aa64c RRD	278
0cb8eb30 HG	279	if (led_cdev->flags & LED_BRIGHT_HW_CHANGED) {
	280	ret = led_add_brightness_hw_changed(led_cdev);
	281	if (ret) {
	282	device_unregister(led_cdev->dev);
6d71021a	283	mutex_unlock(&led_cdev->led_access);
0cb8eb30 HG	284	return ret;
	285	}
	286	}
	287
a9c6ce57	288	led_cdev->work_flags = 0;
270c3957 RP	289	#ifdef CONFIG_LEDS_TRIGGERS
270c3957 RP	290	init_rwsem(&led_cdev->trigger_lock);
0cb8eb30 HG	291	#endif
	292	#ifdef CONFIG_LEDS_BRIGHTNESS_HW_CHANGED
	293	led_cdev->brightness_hw_changed = -1;
270c3957	294	#endif
c72a1d60	295	/* add to the list of leds */
72f8da32	296	down_write(&leds_list_lock);
c72a1d60	297	list_add_tail(&led_cdev->node, &leds_list);
72f8da32	298	up_write(&leds_list_lock);
c72a1d60	299
1bd465e6 GL	300	if (!led_cdev->max_brightness)
	301	led_cdev->max_brightness = LED_FULL;
	302
29d76dfa HMH	303	led_update_brightness(led_cdev);
29d76dfa HMH	304
757b06ae	305	led_init_core(led_cdev);
5ada28bf	306
c3bc9956	307	#ifdef CONFIG_LEDS_TRIGGERS
12fda168	308	led_trigger_set_default(led_cdev);
c3bc9956 RP	309	#endif
c3bc9956 RP	310
6d71021a LH	311	mutex_unlock(&led_cdev->led_access);
6d71021a LH	312
d23e7b8b	313	dev_dbg(parent, "Registered led device: %s\n",
f8a7c6fe	314	led_cdev->name);
c72a1d60 RP	315
	316	return 0;
	317	}
b2b998c0	318	EXPORT_SYMBOL_GPL(led_classdev_register_ext);
c72a1d60 RP	319
c72a1d60 RP	320	/**
0266a458	321	* led_classdev_unregister - unregisters a object of led_properties class.
70d63ccc	322	* @led_cdev: the led device to unregister
c72a1d60 RP	323	*
	324	* Unregisters a previously registered via led_classdev_register object.
	325	*/
b844eba2	326	void led_classdev_unregister(struct led_classdev *led_cdev)
c72a1d60	327	{
c3bc9956	328	#ifdef CONFIG_LEDS_TRIGGERS
dc47206e	329	down_write(&led_cdev->trigger_lock);
c3bc9956 RP	330	if (led_cdev->trigger)
c3bc9956 RP	331	led_trigger_set(led_cdev, NULL);
dc47206e	332	up_write(&led_cdev->trigger_lock);
c3bc9956	333	#endif
c72a1d60	334
d84d80f3 HK	335	led_cdev->flags \|= LED_UNREGISTERING;
d84d80f3 HK	336
5ada28bf	337	/* Stop blinking */
d23a22a7	338	led_stop_software_blink(led_cdev);
d1aa577f	339
19cd67e2	340	led_set_brightness(led_cdev, LED_OFF);
5ada28bf	341
d1aa577f MK	342	flush_work(&led_cdev->set_brightness_work);
d1aa577f MK	343
0cb8eb30 HG	344	if (led_cdev->flags & LED_BRIGHT_HW_CHANGED)
	345	led_remove_brightness_hw_changed(led_cdev);
	346
b844eba2	347	device_unregister(led_cdev->dev);
c72a1d60	348
72f8da32	349	down_write(&leds_list_lock);
c72a1d60	350	list_del(&led_cdev->node);
72f8da32	351	up_write(&leds_list_lock);
acd899e4 JA	352
acd899e4 JA	353	mutex_destroy(&led_cdev->led_access);
c72a1d60	354	}
b844eba2	355	EXPORT_SYMBOL_GPL(led_classdev_unregister);
c72a1d60	356
ca1bb4ee BA	357	static void devm_led_classdev_release(struct device dev, void res)
	358	{
	359	led_classdev_unregister((struct led_classdev *)res);
	360	}
	361
	362	/**
b2b998c0	363	* devm_led_classdev_register_ext - resource managed led_classdev_register_ext()
442c6098 RM	364	*
442c6098 RM	365	* @parent: parent of LED device
ca1bb4ee	366	* @led_cdev: the led_classdev structure for this device.
b2b998c0	367	* @init_data: LED class device initialization data
ca1bb4ee	368	*/
b2b998c0 JA	369	int devm_led_classdev_register_ext(struct device *parent,
	370	struct led_classdev *led_cdev,
	371	struct led_init_data *init_data)
ca1bb4ee BA	372	{
	373	struct led_classdev **dr;
	374	int rc;
	375
	376	dr = devres_alloc(devm_led_classdev_release, sizeof(*dr), GFP_KERNEL);
	377	if (!dr)
	378	return -ENOMEM;
	379
b2b998c0	380	rc = led_classdev_register_ext(parent, led_cdev, init_data);
ca1bb4ee BA	381	if (rc) {
	382	devres_free(dr);
	383	return rc;
	384	}
	385
	386	*dr = led_cdev;
	387	devres_add(parent, dr);
	388
	389	return 0;
	390	}
b2b998c0	391	EXPORT_SYMBOL_GPL(devm_led_classdev_register_ext);
ca1bb4ee BA	392
	393	static int devm_led_classdev_match(struct device dev, void res, void *data)
	394	{
	395	struct led_cdev **p = res;
	396
	397	if (WARN_ON(!p \|\| !*p))
	398	return 0;
	399
	400	return *p == data;
	401	}
	402
	403	/**
	404	* devm_led_classdev_unregister() - resource managed led_classdev_unregister()
	405	* @parent: The device to unregister.
	406	* @led_cdev: the led_classdev structure for this device.
	407	*/
	408	void devm_led_classdev_unregister(struct device *dev,
	409	struct led_classdev *led_cdev)
	410	{
	411	WARN_ON(devres_release(dev,
	412	devm_led_classdev_release,
	413	devm_led_classdev_match, led_cdev));
	414	}
	415	EXPORT_SYMBOL_GPL(devm_led_classdev_unregister);
	416
c72a1d60 RP	417	static int __init leds_init(void)
	418	{
	419	leds_class = class_create(THIS_MODULE, "leds");
	420	if (IS_ERR(leds_class))
	421	return PTR_ERR(leds_class);
73e1ab41	422	leds_class->pm = &leds_class_dev_pm_ops;
5baa7503	423	leds_class->dev_groups = led_groups;
c72a1d60 RP	424	return 0;
	425	}
	426
	427	static void __exit leds_exit(void)
	428	{
	429	class_destroy(leds_class);
	430	}
	431
	432	subsys_initcall(leds_init);
	433	module_exit(leds_exit);
	434
	435	MODULE_AUTHOR("John Lenz, Richard Purdie");
	436	MODULE_LICENSE("GPL");
	437	MODULE_DESCRIPTION("LED Class Interface");