[mirror_ubuntu-hirsute-kernel.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 <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;
}

/**
 * of_led_classdev_register - register a new object of led_classdev class.
 *
 * @parent: parent of LED device
 * @led_cdev: the led_classdev structure for this device.
 * @np: DT node describing this LED
 */
int of_led_classdev_register(struct device *parent, struct device_node *np,
			    struct led_classdev *led_cdev)
{
	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);
	}
	led_cdev->dev->of_node = np;

	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(of_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

	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_of_led_classdev_register - resource managed led_classdev_register()
 *
 * @parent: parent of LED device
 * @led_cdev: the led_classdev structure for this device.
 */
int devm_of_led_classdev_register(struct device *parent,
				  struct device_node *np,
				  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 = of_led_classdev_register(parent, np, led_cdev);
	if (rc) {
		devres_free(dr);
		return rc;
	}

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

	return 0;
}
EXPORT_SYMBOL_GPL(devm_of_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>
eb1ce746	23	#include <uapi/linux/uleds.h>
c72a1d60 RP	24	#include "leds.h"
	25
	26	static struct class *leds_class;
	27
5baa7503	28	static ssize_t brightness_show(struct device *dev,
f8a7c6fe	29	struct device_attribute attr, char buf)
c72a1d60	30	{
f8a7c6fe	31	struct led_classdev *led_cdev = dev_get_drvdata(dev);
c72a1d60 RP	32
c72a1d60 RP	33	/* no lock needed for this */
29d76dfa	34	led_update_brightness(led_cdev);
c72a1d60	35
dd8e5a20	36	return sprintf(buf, "%u\n", led_cdev->brightness);
c72a1d60 RP	37	}
c72a1d60 RP	38
5baa7503	39	static ssize_t brightness_store(struct device *dev,
f8a7c6fe	40	struct device_attribute attr, const char buf, size_t size)
c72a1d60	41	{
f8a7c6fe	42	struct led_classdev *led_cdev = dev_get_drvdata(dev);
872b86be	43	unsigned long state;
acd899e4 JA	44	ssize_t ret;
	45
	46	mutex_lock(&led_cdev->led_access);
	47
	48	if (led_sysfs_is_disabled(led_cdev)) {
	49	ret = -EBUSY;
	50	goto unlock;
	51	}
c72a1d60	52
872b86be SK	53	ret = kstrtoul(buf, 10, &state);
872b86be SK	54	if (ret)
acd899e4	55	goto unlock;
3dc7b82e	56
872b86be SK	57	if (state == LED_OFF)
872b86be SK	58	led_trigger_remove(led_cdev);
4d71a4a1	59	led_set_brightness(led_cdev, state);
0db37915	60	flush_work(&led_cdev->set_brightness_work);
0013b23d	61
acd899e4 JA	62	ret = size;
	63	unlock:
	64	mutex_unlock(&led_cdev->led_access);
	65	return ret;
c72a1d60	66	}
5baa7503	67	static DEVICE_ATTR_RW(brightness);
c72a1d60	68
38419612	69	static ssize_t max_brightness_show(struct device *dev,
1bd465e6 GL	70	struct device_attribute attr, char buf)
	71	{
	72	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	73
	74	return sprintf(buf, "%u\n", led_cdev->max_brightness);
	75	}
38419612	76	static DEVICE_ATTR_RO(max_brightness);
1bd465e6	77
c3bc9956	78	#ifdef CONFIG_LEDS_TRIGGERS
5baa7503 GKH	79	static DEVICE_ATTR(trigger, 0644, led_trigger_show, led_trigger_store);
	80	static struct attribute *led_trigger_attrs[] = {
	81	&dev_attr_trigger.attr,
	82	NULL,
	83	};
	84	static const struct attribute_group led_trigger_group = {
	85	.attrs = led_trigger_attrs,
	86	};
	87	#endif
	88
	89	static struct attribute *led_class_attrs[] = {
	90	&dev_attr_brightness.attr,
	91	&dev_attr_max_brightness.attr,
	92	NULL,
	93	};
	94
	95	static const struct attribute_group led_group = {
	96	.attrs = led_class_attrs,
	97	};
	98
	99	static const struct attribute_group *led_groups[] = {
	100	&led_group,
	101	#ifdef CONFIG_LEDS_TRIGGERS
	102	&led_trigger_group,
c3bc9956	103	#endif
5baa7503	104	NULL,
14b5d6dd	105	};
c72a1d60	106
0cb8eb30 HG	107	#ifdef CONFIG_LEDS_BRIGHTNESS_HW_CHANGED
	108	static ssize_t brightness_hw_changed_show(struct device *dev,
	109	struct device_attribute attr, char buf)
	110	{
	111	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	112
	113	if (led_cdev->brightness_hw_changed == -1)
	114	return -ENODATA;
	115
	116	return sprintf(buf, "%u\n", led_cdev->brightness_hw_changed);
	117	}
	118
	119	static DEVICE_ATTR_RO(brightness_hw_changed);
	120
	121	static int led_add_brightness_hw_changed(struct led_classdev *led_cdev)
	122	{
	123	struct device *dev = led_cdev->dev;
	124	int ret;
	125
	126	ret = device_create_file(dev, &dev_attr_brightness_hw_changed);
	127	if (ret) {
	128	dev_err(dev, "Error creating brightness_hw_changed\n");
	129	return ret;
	130	}
	131
	132	led_cdev->brightness_hw_changed_kn =
	133	sysfs_get_dirent(dev->kobj.sd, "brightness_hw_changed");
	134	if (!led_cdev->brightness_hw_changed_kn) {
	135	dev_err(dev, "Error getting brightness_hw_changed kn\n");
	136	device_remove_file(dev, &dev_attr_brightness_hw_changed);
	137	return -ENXIO;
	138	}
	139
	140	return 0;
	141	}
	142
	143	static void led_remove_brightness_hw_changed(struct led_classdev *led_cdev)
	144	{
	145	sysfs_put(led_cdev->brightness_hw_changed_kn);
	146	device_remove_file(led_cdev->dev, &dev_attr_brightness_hw_changed);
	147	}
	148
	149	void led_classdev_notify_brightness_hw_changed(struct led_classdev *led_cdev,
	150	enum led_brightness brightness)
	151	{
	152	if (WARN_ON(!led_cdev->brightness_hw_changed_kn))
	153	return;
	154
	155	led_cdev->brightness_hw_changed = brightness;
	156	sysfs_notify_dirent(led_cdev->brightness_hw_changed_kn);
	157	}
	158	EXPORT_SYMBOL_GPL(led_classdev_notify_brightness_hw_changed);
	159	#else
	160	static int led_add_brightness_hw_changed(struct led_classdev *led_cdev)
	161	{
	162	return 0;
	163	}
	164	static void led_remove_brightness_hw_changed(struct led_classdev *led_cdev)
	165	{
	166	}
	167	#endif
	168
c72a1d60 RP	169	/**
	170	* led_classdev_suspend - suspend an led_classdev.
	171	* @led_cdev: the led_classdev to suspend.
	172	*/
	173	void led_classdev_suspend(struct led_classdev *led_cdev)
	174	{
	175	led_cdev->flags \|= LED_SUSPENDED;
81fe8e5b	176	led_set_brightness_nopm(led_cdev, 0);
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
a96aa64c RR	219	static int match_name(struct device dev, const void data)
	220	{
	221	if (!dev_name(dev))
	222	return 0;
	223	return !strcmp(dev_name(dev), (char *)data);
	224	}
	225
	226	static int led_classdev_next_name(const char init_name, char name,
	227	size_t len)
	228	{
	229	unsigned int i = 0;
	230	int ret = 0;
e5b5a61f	231	struct device *dev;
a96aa64c RR	232
	233	strlcpy(name, init_name, len);
	234
e5b5a61f RR	235	while ((ret < len) &&
	236	(dev = class_find_device(leds_class, NULL, name, match_name))) {
	237	put_device(dev);
a96aa64c	238	ret = snprintf(name, len, "%s_%u", init_name, ++i);
e5b5a61f	239	}
a96aa64c RR	240
	241	if (ret >= len)
	242	return -ENOMEM;
	243
	244	return i;
	245	}
	246
c72a1d60	247	/**
442c6098 RM	248	* of_led_classdev_register - register a new object of led_classdev class.
	249	*
	250	* @parent: parent of LED device
c72a1d60	251	* @led_cdev: the led_classdev structure for this device.
442c6098	252	* @np: DT node describing this LED
c72a1d60	253	*/
442c6098 RM	254	int of_led_classdev_register(struct device parent, struct device_node np,
442c6098 RM	255	struct led_classdev *led_cdev)
c72a1d60	256	{
eb1ce746	257	char name[LED_MAX_NAME_SIZE];
a96aa64c RR	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	}
442c6098	272	led_cdev->dev->of_node = np;
c72a1d60	273
a96aa64c	274	if (ret)
6f06c7f8	275	dev_warn(parent, "Led %s renamed to %s due to name collision",
a96aa64c RR	276	led_cdev->name, dev_name(led_cdev->dev));
a96aa64c RR	277
0cb8eb30 HG	278	if (led_cdev->flags & LED_BRIGHT_HW_CHANGED) {
	279	ret = led_add_brightness_hw_changed(led_cdev);
	280	if (ret) {
	281	device_unregister(led_cdev->dev);
6d71021a	282	mutex_unlock(&led_cdev->led_access);
0cb8eb30 HG	283	return ret;
	284	}
	285	}
	286
a9c6ce57	287	led_cdev->work_flags = 0;
270c3957 RP	288	#ifdef CONFIG_LEDS_TRIGGERS
270c3957 RP	289	init_rwsem(&led_cdev->trigger_lock);
0cb8eb30 HG	290	#endif
	291	#ifdef CONFIG_LEDS_BRIGHTNESS_HW_CHANGED
	292	led_cdev->brightness_hw_changed = -1;
270c3957	293	#endif
c72a1d60	294	/* add to the list of leds */
72f8da32	295	down_write(&leds_list_lock);
c72a1d60	296	list_add_tail(&led_cdev->node, &leds_list);
72f8da32	297	up_write(&leds_list_lock);
c72a1d60	298
1bd465e6 GL	299	if (!led_cdev->max_brightness)
	300	led_cdev->max_brightness = LED_FULL;
	301
29d76dfa HMH	302	led_update_brightness(led_cdev);
29d76dfa HMH	303
757b06ae	304	led_init_core(led_cdev);
5ada28bf	305
c3bc9956	306	#ifdef CONFIG_LEDS_TRIGGERS
12fda168	307	led_trigger_set_default(led_cdev);
c3bc9956 RP	308	#endif
c3bc9956 RP	309
6d71021a LH	310	mutex_unlock(&led_cdev->led_access);
6d71021a LH	311
d23e7b8b	312	dev_dbg(parent, "Registered led device: %s\n",
f8a7c6fe	313	led_cdev->name);
c72a1d60 RP	314
	315	return 0;
	316	}
442c6098	317	EXPORT_SYMBOL_GPL(of_led_classdev_register);
c72a1d60 RP	318
c72a1d60 RP	319	/**
0266a458	320	* led_classdev_unregister - unregisters a object of led_properties class.
70d63ccc	321	* @led_cdev: the led device to unregister
c72a1d60 RP	322	*
	323	* Unregisters a previously registered via led_classdev_register object.
	324	*/
b844eba2	325	void led_classdev_unregister(struct led_classdev *led_cdev)
c72a1d60	326	{
c3bc9956	327	#ifdef CONFIG_LEDS_TRIGGERS
dc47206e	328	down_write(&led_cdev->trigger_lock);
c3bc9956 RP	329	if (led_cdev->trigger)
c3bc9956 RP	330	led_trigger_set(led_cdev, NULL);
dc47206e	331	up_write(&led_cdev->trigger_lock);
c3bc9956	332	#endif
c72a1d60	333
d84d80f3 HK	334	led_cdev->flags \|= LED_UNREGISTERING;
d84d80f3 HK	335
5ada28bf	336	/* Stop blinking */
d23a22a7	337	led_stop_software_blink(led_cdev);
d1aa577f	338
19cd67e2	339	led_set_brightness(led_cdev, LED_OFF);
5ada28bf	340
d1aa577f MK	341	flush_work(&led_cdev->set_brightness_work);
d1aa577f MK	342
0cb8eb30 HG	343	if (led_cdev->flags & LED_BRIGHT_HW_CHANGED)
	344	led_remove_brightness_hw_changed(led_cdev);
	345
b844eba2	346	device_unregister(led_cdev->dev);
c72a1d60	347
72f8da32	348	down_write(&leds_list_lock);
c72a1d60	349	list_del(&led_cdev->node);
72f8da32	350	up_write(&leds_list_lock);
acd899e4 JA	351
acd899e4 JA	352	mutex_destroy(&led_cdev->led_access);
c72a1d60	353	}
b844eba2	354	EXPORT_SYMBOL_GPL(led_classdev_unregister);
c72a1d60	355
ca1bb4ee BA	356	static void devm_led_classdev_release(struct device dev, void res)
	357	{
	358	led_classdev_unregister((struct led_classdev *)res);
	359	}
	360
	361	/**
442c6098 RM	362	* devm_of_led_classdev_register - resource managed led_classdev_register()
	363	*
	364	* @parent: parent of LED device
ca1bb4ee BA	365	* @led_cdev: the led_classdev structure for this device.
ca1bb4ee BA	366	*/
442c6098 RM	367	int devm_of_led_classdev_register(struct device *parent,
	368	struct device_node *np,
	369	struct led_classdev *led_cdev)
ca1bb4ee BA	370	{
	371	struct led_classdev **dr;
	372	int rc;
	373
	374	dr = devres_alloc(devm_led_classdev_release, sizeof(*dr), GFP_KERNEL);
	375	if (!dr)
	376	return -ENOMEM;
	377
442c6098	378	rc = of_led_classdev_register(parent, np, led_cdev);
ca1bb4ee BA	379	if (rc) {
	380	devres_free(dr);
	381	return rc;
	382	}
	383
	384	*dr = led_cdev;
	385	devres_add(parent, dr);
	386
	387	return 0;
	388	}
442c6098	389	EXPORT_SYMBOL_GPL(devm_of_led_classdev_register);
ca1bb4ee BA	390
	391	static int devm_led_classdev_match(struct device dev, void res, void *data)
	392	{
	393	struct led_cdev **p = res;
	394
	395	if (WARN_ON(!p \|\| !*p))
	396	return 0;
	397
	398	return *p == data;
	399	}
	400
	401	/**
	402	* devm_led_classdev_unregister() - resource managed led_classdev_unregister()
	403	* @parent: The device to unregister.
	404	* @led_cdev: the led_classdev structure for this device.
	405	*/
	406	void devm_led_classdev_unregister(struct device *dev,
	407	struct led_classdev *led_cdev)
	408	{
	409	WARN_ON(devres_release(dev,
	410	devm_led_classdev_release,
	411	devm_led_classdev_match, led_cdev));
	412	}
	413	EXPORT_SYMBOL_GPL(devm_led_classdev_unregister);
	414
c72a1d60 RP	415	static int __init leds_init(void)
	416	{
	417	leds_class = class_create(THIS_MODULE, "leds");
	418	if (IS_ERR(leds_class))
	419	return PTR_ERR(leds_class);
73e1ab41	420	leds_class->pm = &leds_class_dev_pm_ops;
5baa7503	421	leds_class->dev_groups = led_groups;
c72a1d60 RP	422	return 0;
	423	}
	424
	425	static void __exit leds_exit(void)
	426	{
	427	class_destroy(leds_class);
	428	}
	429
	430	subsys_initcall(leds_init);
	431	module_exit(leds_exit);
	432
	433	MODULE_AUTHOR("John Lenz, Richard Purdie");
	434	MODULE_LICENSE("GPL");
	435	MODULE_DESCRIPTION("LED Class Interface");