[mirror_ubuntu-jammy-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);

	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;

	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);
	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);
			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
	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_update_brightness(led_cdev);

	led_init_core(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(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);
0013b23d	60
acd899e4 JA	61	ret = size;
	62	unlock:
	63	mutex_unlock(&led_cdev->led_access);
	64	return ret;
c72a1d60	65	}
5baa7503	66	static DEVICE_ATTR_RW(brightness);
c72a1d60	67
38419612	68	static ssize_t max_brightness_show(struct device *dev,
1bd465e6 GL	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	}
38419612	75	static DEVICE_ATTR_RO(max_brightness);
1bd465e6	76
c3bc9956	77	#ifdef CONFIG_LEDS_TRIGGERS
5baa7503 GKH	78	static DEVICE_ATTR(trigger, 0644, led_trigger_show, led_trigger_store);
	79	static struct attribute *led_trigger_attrs[] = {
	80	&dev_attr_trigger.attr,
	81	NULL,
	82	};
	83	static const struct attribute_group led_trigger_group = {
	84	.attrs = led_trigger_attrs,
	85	};
	86	#endif
	87
	88	static struct attribute *led_class_attrs[] = {
	89	&dev_attr_brightness.attr,
	90	&dev_attr_max_brightness.attr,
	91	NULL,
	92	};
	93
	94	static const struct attribute_group led_group = {
	95	.attrs = led_class_attrs,
	96	};
	97
	98	static const struct attribute_group *led_groups[] = {
	99	&led_group,
	100	#ifdef CONFIG_LEDS_TRIGGERS
	101	&led_trigger_group,
c3bc9956	102	#endif
5baa7503	103	NULL,
14b5d6dd	104	};
c72a1d60	105
0cb8eb30 HG	106	#ifdef CONFIG_LEDS_BRIGHTNESS_HW_CHANGED
	107	static 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
	118	static DEVICE_ATTR_RO(brightness_hw_changed);
	119
	120	static 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
	142	static 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
	148	void led_classdev_notify_brightness_hw_changed(struct led_classdev *led_cdev,
	149	enum led_brightness brightness)
	150	{
	151	if (WARN_ON(!led_cdev->brightness_hw_changed_kn))
	152	return;
	153
	154	led_cdev->brightness_hw_changed = brightness;
	155	sysfs_notify_dirent(led_cdev->brightness_hw_changed_kn);
	156	}
	157	EXPORT_SYMBOL_GPL(led_classdev_notify_brightness_hw_changed);
	158	#else
	159	static int led_add_brightness_hw_changed(struct led_classdev *led_cdev)
	160	{
	161	return 0;
	162	}
	163	static void led_remove_brightness_hw_changed(struct led_classdev *led_cdev)
	164	{
	165	}
	166	#endif
	167
c72a1d60 RP	168	/**
	169	* led_classdev_suspend - suspend an led_classdev.
	170	* @led_cdev: the led_classdev to suspend.
	171	*/
	172	void led_classdev_suspend(struct led_classdev *led_cdev)
	173	{
	174	led_cdev->flags \|= LED_SUSPENDED;
81fe8e5b	175	led_set_brightness_nopm(led_cdev, 0);
c72a1d60 RP	176	}
	177	EXPORT_SYMBOL_GPL(led_classdev_suspend);
	178
	179	/**
	180	* led_classdev_resume - resume an led_classdev.
	181	* @led_cdev: the led_classdev to resume.
	182	*/
	183	void led_classdev_resume(struct led_classdev *led_cdev)
	184	{
81fe8e5b	185	led_set_brightness_nopm(led_cdev, led_cdev->brightness);
7aea8389 JA	186
	187	if (led_cdev->flash_resume)
	188	led_cdev->flash_resume(led_cdev);
	189
c72a1d60 RP	190	led_cdev->flags &= ~LED_SUSPENDED;
	191	}
	192	EXPORT_SYMBOL_GPL(led_classdev_resume);
	193
084609bf	194	#ifdef CONFIG_PM_SLEEP
73e1ab41	195	static int led_suspend(struct device *dev)
859cb7f2 RP	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
	205	static 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	}
084609bf	214	#endif
859cb7f2	215
084609bf	216	static SIMPLE_DEV_PM_OPS(leds_class_dev_pm_ops, led_suspend, led_resume);
73e1ab41	217
a96aa64c RR	218	static int match_name(struct device dev, const void data)
	219	{
	220	if (!dev_name(dev))
	221	return 0;
	222	return !strcmp(dev_name(dev), (char *)data);
	223	}
	224
	225	static int led_classdev_next_name(const char init_name, char name,
	226	size_t len)
	227	{
	228	unsigned int i = 0;
	229	int ret = 0;
e5b5a61f	230	struct device *dev;
a96aa64c RR	231
	232	strlcpy(name, init_name, len);
	233
e5b5a61f RR	234	while ((ret < len) &&
	235	(dev = class_find_device(leds_class, NULL, name, match_name))) {
	236	put_device(dev);
a96aa64c	237	ret = snprintf(name, len, "%s_%u", init_name, ++i);
e5b5a61f	238	}
a96aa64c RR	239
	240	if (ret >= len)
	241	return -ENOMEM;
	242
	243	return i;
	244	}
	245
c72a1d60	246	/**
442c6098 RM	247	* of_led_classdev_register - register a new object of led_classdev class.
	248	*
	249	* @parent: parent of LED device
c72a1d60	250	* @led_cdev: the led_classdev structure for this device.
442c6098	251	* @np: DT node describing this LED
c72a1d60	252	*/
442c6098 RM	253	int of_led_classdev_register(struct device parent, struct device_node np,
442c6098 RM	254	struct led_classdev *led_cdev)
c72a1d60	255	{
eb1ce746	256	char name[LED_MAX_NAME_SIZE];
a96aa64c RR	257	int ret;
	258
	259	ret = led_classdev_next_name(led_cdev->name, name, sizeof(name));
	260	if (ret < 0)
	261	return ret;
	262
d0d480cc	263	led_cdev->dev = device_create_with_groups(leds_class, parent, 0,
ccdc4507	264	led_cdev, led_cdev->groups, "%s", name);
801678c5	265	if (IS_ERR(led_cdev->dev))
f8a7c6fe	266	return PTR_ERR(led_cdev->dev);
442c6098	267	led_cdev->dev->of_node = np;
c72a1d60	268
a96aa64c	269	if (ret)
6f06c7f8	270	dev_warn(parent, "Led %s renamed to %s due to name collision",
a96aa64c RR	271	led_cdev->name, dev_name(led_cdev->dev));
a96aa64c RR	272
0cb8eb30 HG	273	if (led_cdev->flags & LED_BRIGHT_HW_CHANGED) {
	274	ret = led_add_brightness_hw_changed(led_cdev);
	275	if (ret) {
	276	device_unregister(led_cdev->dev);
	277	return ret;
	278	}
	279	}
	280
a9c6ce57	281	led_cdev->work_flags = 0;
270c3957 RP	282	#ifdef CONFIG_LEDS_TRIGGERS
270c3957 RP	283	init_rwsem(&led_cdev->trigger_lock);
0cb8eb30 HG	284	#endif
	285	#ifdef CONFIG_LEDS_BRIGHTNESS_HW_CHANGED
	286	led_cdev->brightness_hw_changed = -1;
270c3957	287	#endif
acd899e4	288	mutex_init(&led_cdev->led_access);
c72a1d60	289	/* add to the list of leds */
72f8da32	290	down_write(&leds_list_lock);
c72a1d60	291	list_add_tail(&led_cdev->node, &leds_list);
72f8da32	292	up_write(&leds_list_lock);
c72a1d60	293
1bd465e6 GL	294	if (!led_cdev->max_brightness)
	295	led_cdev->max_brightness = LED_FULL;
	296
29d76dfa HMH	297	led_update_brightness(led_cdev);
29d76dfa HMH	298
757b06ae	299	led_init_core(led_cdev);
5ada28bf	300
c3bc9956	301	#ifdef CONFIG_LEDS_TRIGGERS
12fda168	302	led_trigger_set_default(led_cdev);
c3bc9956 RP	303	#endif
c3bc9956 RP	304
d23e7b8b	305	dev_dbg(parent, "Registered led device: %s\n",
f8a7c6fe	306	led_cdev->name);
c72a1d60 RP	307
	308	return 0;
	309	}
442c6098	310	EXPORT_SYMBOL_GPL(of_led_classdev_register);
c72a1d60 RP	311
c72a1d60 RP	312	/**
0266a458	313	* led_classdev_unregister - unregisters a object of led_properties class.
70d63ccc	314	* @led_cdev: the led device to unregister
c72a1d60 RP	315	*
	316	* Unregisters a previously registered via led_classdev_register object.
	317	*/
b844eba2	318	void led_classdev_unregister(struct led_classdev *led_cdev)
c72a1d60	319	{
c3bc9956	320	#ifdef CONFIG_LEDS_TRIGGERS
dc47206e	321	down_write(&led_cdev->trigger_lock);
c3bc9956 RP	322	if (led_cdev->trigger)
c3bc9956 RP	323	led_trigger_set(led_cdev, NULL);
dc47206e	324	up_write(&led_cdev->trigger_lock);
c3bc9956	325	#endif
c72a1d60	326
d84d80f3 HK	327	led_cdev->flags \|= LED_UNREGISTERING;
d84d80f3 HK	328
5ada28bf	329	/* Stop blinking */
d23a22a7	330	led_stop_software_blink(led_cdev);
d1aa577f	331
19cd67e2	332	led_set_brightness(led_cdev, LED_OFF);
5ada28bf	333
d1aa577f MK	334	flush_work(&led_cdev->set_brightness_work);
d1aa577f MK	335
0cb8eb30 HG	336	if (led_cdev->flags & LED_BRIGHT_HW_CHANGED)
	337	led_remove_brightness_hw_changed(led_cdev);
	338
b844eba2	339	device_unregister(led_cdev->dev);
c72a1d60	340
72f8da32	341	down_write(&leds_list_lock);
c72a1d60	342	list_del(&led_cdev->node);
72f8da32	343	up_write(&leds_list_lock);
acd899e4 JA	344
acd899e4 JA	345	mutex_destroy(&led_cdev->led_access);
c72a1d60	346	}
b844eba2	347	EXPORT_SYMBOL_GPL(led_classdev_unregister);
c72a1d60	348
ca1bb4ee BA	349	static void devm_led_classdev_release(struct device dev, void res)
	350	{
	351	led_classdev_unregister((struct led_classdev *)res);
	352	}
	353
	354	/**
442c6098 RM	355	* devm_of_led_classdev_register - resource managed led_classdev_register()
	356	*
	357	* @parent: parent of LED device
ca1bb4ee BA	358	* @led_cdev: the led_classdev structure for this device.
ca1bb4ee BA	359	*/
442c6098 RM	360	int devm_of_led_classdev_register(struct device *parent,
	361	struct device_node *np,
	362	struct led_classdev *led_cdev)
ca1bb4ee BA	363	{
	364	struct led_classdev **dr;
	365	int rc;
	366
	367	dr = devres_alloc(devm_led_classdev_release, sizeof(*dr), GFP_KERNEL);
	368	if (!dr)
	369	return -ENOMEM;
	370
442c6098	371	rc = of_led_classdev_register(parent, np, led_cdev);
ca1bb4ee BA	372	if (rc) {
	373	devres_free(dr);
	374	return rc;
	375	}
	376
	377	*dr = led_cdev;
	378	devres_add(parent, dr);
	379
	380	return 0;
	381	}
442c6098	382	EXPORT_SYMBOL_GPL(devm_of_led_classdev_register);
ca1bb4ee BA	383
	384	static int devm_led_classdev_match(struct device dev, void res, void *data)
	385	{
	386	struct led_cdev **p = res;
	387
	388	if (WARN_ON(!p \|\| !*p))
	389	return 0;
	390
	391	return *p == data;
	392	}
	393
	394	/**
	395	* devm_led_classdev_unregister() - resource managed led_classdev_unregister()
	396	* @parent: The device to unregister.
	397	* @led_cdev: the led_classdev structure for this device.
	398	*/
	399	void devm_led_classdev_unregister(struct device *dev,
	400	struct led_classdev *led_cdev)
	401	{
	402	WARN_ON(devres_release(dev,
	403	devm_led_classdev_release,
	404	devm_led_classdev_match, led_cdev));
	405	}
	406	EXPORT_SYMBOL_GPL(devm_led_classdev_unregister);
	407
c72a1d60 RP	408	static int __init leds_init(void)
	409	{
	410	leds_class = class_create(THIS_MODULE, "leds");
	411	if (IS_ERR(leds_class))
	412	return PTR_ERR(leds_class);
73e1ab41	413	leds_class->pm = &leds_class_dev_pm_ops;
5baa7503	414	leds_class->dev_groups = led_groups;
c72a1d60 RP	415	return 0;
	416	}
	417
	418	static void __exit leds_exit(void)
	419	{
	420	class_destroy(leds_class);
	421	}
	422
	423	subsys_initcall(leds_init);
	424	module_exit(leds_exit);
	425
	426	MODULE_AUTHOR("John Lenz, Richard Purdie");
	427	MODULE_LICENSE("GPL");
	428	MODULE_DESCRIPTION("LED Class Interface");