[mirror_ubuntu-bionic-kernel.git] / drivers / leds / led-triggers.c

/*
 * LED Triggers Core
 *
 * Copyright 2005-2007 Openedhand Ltd.
 *
 * Author: 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/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/list.h>
#include <linux/spinlock.h>
#include <linux/device.h>
#include <linux/timer.h>
#include <linux/rwsem.h>
#include <linux/leds.h>
#include <linux/slab.h>
#include "leds.h"

/*
 * Nests outside led_cdev->trigger_lock
 */
static DECLARE_RWSEM(triggers_list_lock);
static LIST_HEAD(trigger_list);

 /* Used by LED Class */

ssize_t led_trigger_store(struct device *dev, struct device_attribute *attr,
		const char *buf, size_t count)
{
	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	char trigger_name[TRIG_NAME_MAX];
	struct led_trigger *trig;
	size_t len;

	trigger_name[sizeof(trigger_name) - 1] = '\0';
	strncpy(trigger_name, buf, sizeof(trigger_name) - 1);
	len = strlen(trigger_name);

	if (len && trigger_name[len - 1] == '\n')
		trigger_name[len - 1] = '\0';

	if (!strcmp(trigger_name, "none")) {
		led_trigger_remove(led_cdev);
		return count;
	}

	down_read(&triggers_list_lock);
	list_for_each_entry(trig, &trigger_list, next_trig) {
		if (!strcmp(trigger_name, trig->name)) {
			down_write(&led_cdev->trigger_lock);
			led_trigger_set(led_cdev, trig);
			up_write(&led_cdev->trigger_lock);

			up_read(&triggers_list_lock);
			return count;
		}
	}
	up_read(&triggers_list_lock);

	return -EINVAL;
}
EXPORT_SYMBOL_GPL(led_trigger_store);

ssize_t led_trigger_show(struct device *dev, struct device_attribute *attr,
		char *buf)
{
	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	struct led_trigger *trig;
	int len = 0;

	down_read(&triggers_list_lock);
	down_read(&led_cdev->trigger_lock);

	if (!led_cdev->trigger)
		len += sprintf(buf+len, "[none] ");
	else
		len += sprintf(buf+len, "none ");

	list_for_each_entry(trig, &trigger_list, next_trig) {
		if (led_cdev->trigger && !strcmp(led_cdev->trigger->name,
							trig->name))
			len += sprintf(buf+len, "[%s] ", trig->name);
		else
			len += sprintf(buf+len, "%s ", trig->name);
	}
	up_read(&led_cdev->trigger_lock);
	up_read(&triggers_list_lock);

	len += sprintf(len+buf, "\n");
	return len;
}
EXPORT_SYMBOL_GPL(led_trigger_show);

/* Caller must ensure led_cdev->trigger_lock held */
void led_trigger_set(struct led_classdev *led_cdev, struct led_trigger *trig)
{
	unsigned long flags;
	char *event = NULL;
	char *envp[2];
	const char *name;

	name = trig ? trig->name : "none";
	event = kasprintf(GFP_KERNEL, "TRIGGER=%s", name);

	/* Remove any existing trigger */
	if (led_cdev->trigger) {
		write_lock_irqsave(&led_cdev->trigger->leddev_list_lock, flags);
		list_del(&led_cdev->trig_list);
		write_unlock_irqrestore(&led_cdev->trigger->leddev_list_lock,
			flags);
		cancel_work_sync(&led_cdev->set_brightness_work);
		led_stop_software_blink(led_cdev);
		if (led_cdev->trigger->deactivate)
			led_cdev->trigger->deactivate(led_cdev);
		led_cdev->trigger = NULL;
		led_set_brightness(led_cdev, LED_OFF);
	}
	if (trig) {
		write_lock_irqsave(&trig->leddev_list_lock, flags);
		list_add_tail(&led_cdev->trig_list, &trig->led_cdevs);
		write_unlock_irqrestore(&trig->leddev_list_lock, flags);
		led_cdev->trigger = trig;
		if (trig->activate)
			trig->activate(led_cdev);
	}

	if (event) {
		envp[0] = event;
		envp[1] = NULL;
		kobject_uevent_env(&led_cdev->dev->kobj, KOBJ_CHANGE, envp);
		kfree(event);
	}
}
EXPORT_SYMBOL_GPL(led_trigger_set);

void led_trigger_remove(struct led_classdev *led_cdev)
{
	down_write(&led_cdev->trigger_lock);
	led_trigger_set(led_cdev, NULL);
	up_write(&led_cdev->trigger_lock);
}
EXPORT_SYMBOL_GPL(led_trigger_remove);

void led_trigger_set_default(struct led_classdev *led_cdev)
{
	struct led_trigger *trig;

	if (!led_cdev->default_trigger)
		return;

	down_read(&triggers_list_lock);
	down_write(&led_cdev->trigger_lock);
	list_for_each_entry(trig, &trigger_list, next_trig) {
		if (!strcmp(led_cdev->default_trigger, trig->name))
			led_trigger_set(led_cdev, trig);
	}
	up_write(&led_cdev->trigger_lock);
	up_read(&triggers_list_lock);
}
EXPORT_SYMBOL_GPL(led_trigger_set_default);

void led_trigger_rename_static(const char *name, struct led_trigger *trig)
{
	/* new name must be on a temporary string to prevent races */
	BUG_ON(name == trig->name);

	down_write(&triggers_list_lock);
	/* this assumes that trig->name was originaly allocated to
	 * non constant storage */
	strcpy((char *)trig->name, name);
	up_write(&triggers_list_lock);
}
EXPORT_SYMBOL_GPL(led_trigger_rename_static);

/* LED Trigger Interface */

int led_trigger_register(struct led_trigger *trig)
{
	struct led_classdev *led_cdev;
	struct led_trigger *_trig;

	rwlock_init(&trig->leddev_list_lock);
	INIT_LIST_HEAD(&trig->led_cdevs);

	down_write(&triggers_list_lock);
	/* Make sure the trigger's name isn't already in use */
	list_for_each_entry(_trig, &trigger_list, next_trig) {
		if (!strcmp(_trig->name, trig->name)) {
			up_write(&triggers_list_lock);
			return -EEXIST;
		}
	}
	/* Add to the list of led triggers */
	list_add_tail(&trig->next_trig, &trigger_list);
	up_write(&triggers_list_lock);

	/* Register with any LEDs that have this as a default trigger */
	down_read(&leds_list_lock);
	list_for_each_entry(led_cdev, &leds_list, node) {
		down_write(&led_cdev->trigger_lock);
		if (!led_cdev->trigger && led_cdev->default_trigger &&
			    !strcmp(led_cdev->default_trigger, trig->name))
			led_trigger_set(led_cdev, trig);
		up_write(&led_cdev->trigger_lock);
	}
	up_read(&leds_list_lock);

	return 0;
}
EXPORT_SYMBOL_GPL(led_trigger_register);

void led_trigger_unregister(struct led_trigger *trig)
{
	struct led_classdev *led_cdev;

	/* Remove from the list of led triggers */
	down_write(&triggers_list_lock);
	list_del(&trig->next_trig);
	up_write(&triggers_list_lock);

	/* Remove anyone actively using this trigger */
	down_read(&leds_list_lock);
	list_for_each_entry(led_cdev, &leds_list, node) {
		down_write(&led_cdev->trigger_lock);
		if (led_cdev->trigger == trig)
			led_trigger_set(led_cdev, NULL);
		up_write(&led_cdev->trigger_lock);
	}
	up_read(&leds_list_lock);
}
EXPORT_SYMBOL_GPL(led_trigger_unregister);

/* Simple LED Tigger Interface */

void led_trigger_event(struct led_trigger *trig,
			enum led_brightness brightness)
{
	struct led_classdev *led_cdev;

	if (!trig)
		return;

	read_lock(&trig->leddev_list_lock);
	list_for_each_entry(led_cdev, &trig->led_cdevs, trig_list)
		led_set_brightness(led_cdev, brightness);
	read_unlock(&trig->leddev_list_lock);
}
EXPORT_SYMBOL_GPL(led_trigger_event);

static void led_trigger_blink_setup(struct led_trigger *trig,
			     unsigned long *delay_on,
			     unsigned long *delay_off,
			     int oneshot,
			     int invert)
{
	struct led_classdev *led_cdev;

	if (!trig)
		return;

	read_lock(&trig->leddev_list_lock);
	list_for_each_entry(led_cdev, &trig->led_cdevs, trig_list) {
		if (oneshot)
			led_blink_set_oneshot(led_cdev, delay_on, delay_off,
					      invert);
		else
			led_blink_set(led_cdev, delay_on, delay_off);
	}
	read_unlock(&trig->leddev_list_lock);
}

void led_trigger_blink(struct led_trigger *trig,
		       unsigned long *delay_on,
		       unsigned long *delay_off)
{
	led_trigger_blink_setup(trig, delay_on, delay_off, 0, 0);
}
EXPORT_SYMBOL_GPL(led_trigger_blink);

void led_trigger_blink_oneshot(struct led_trigger *trig,
			       unsigned long *delay_on,
			       unsigned long *delay_off,
			       int invert)
{
	led_trigger_blink_setup(trig, delay_on, delay_off, 1, invert);
}
EXPORT_SYMBOL_GPL(led_trigger_blink_oneshot);

void led_trigger_register_simple(const char *name, struct led_trigger **tp)
{
	struct led_trigger *trig;
	int err;

	trig = kzalloc(sizeof(struct led_trigger), GFP_KERNEL);

	if (trig) {
		trig->name = name;
		err = led_trigger_register(trig);
		if (err < 0) {
			kfree(trig);
			trig = NULL;
			pr_warn("LED trigger %s failed to register (%d)\n",
				name, err);
		}
	} else {
		pr_warn("LED trigger %s failed to register (no memory)\n",
			name);
	}
	*tp = trig;
}
EXPORT_SYMBOL_GPL(led_trigger_register_simple);

void led_trigger_unregister_simple(struct led_trigger *trig)
{
	if (trig)
		led_trigger_unregister(trig);
	kfree(trig);
}
EXPORT_SYMBOL_GPL(led_trigger_unregister_simple);

MODULE_AUTHOR("Richard Purdie");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("LED Triggers Core");
Commit	Line	Data
c3bc9956 RP	1	/*
	2	* LED Triggers Core
	3	*
f8a7c6fe	4	* Copyright 2005-2007 Openedhand Ltd.
c3bc9956 RP	5	*
	6	* Author: Richard Purdie <rpurdie@openedhand.com>
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License version 2 as
	10	* published by the Free Software Foundation.
	11	*
	12	*/
	13
c3bc9956 RP	14	#include <linux/module.h>
	15	#include <linux/kernel.h>
	16	#include <linux/init.h>
	17	#include <linux/list.h>
	18	#include <linux/spinlock.h>
	19	#include <linux/device.h>
c3bc9956	20	#include <linux/timer.h>
dc47206e	21	#include <linux/rwsem.h>
c3bc9956	22	#include <linux/leds.h>
5a0e3ad6	23	#include <linux/slab.h>
c3bc9956 RP	24	#include "leds.h"
	25
	26	/*
	27	* Nests outside led_cdev->trigger_lock
	28	*/
dc47206e	29	static DECLARE_RWSEM(triggers_list_lock);
c3bc9956 RP	30	static LIST_HEAD(trigger_list);
c3bc9956 RP	31
4d404fd5 NM	32	/* Used by LED Class */
4d404fd5 NM	33
f8a7c6fe RP	34	ssize_t led_trigger_store(struct device dev, struct device_attribute attr,
f8a7c6fe RP	35	const char *buf, size_t count)
c3bc9956	36	{
f8a7c6fe	37	struct led_classdev *led_cdev = dev_get_drvdata(dev);
c3bc9956 RP	38	char trigger_name[TRIG_NAME_MAX];
	39	struct led_trigger *trig;
	40	size_t len;
	41
	42	trigger_name[sizeof(trigger_name) - 1] = '\0';
	43	strncpy(trigger_name, buf, sizeof(trigger_name) - 1);
	44	len = strlen(trigger_name);
	45
	46	if (len && trigger_name[len - 1] == '\n')
	47	trigger_name[len - 1] = '\0';
	48
	49	if (!strcmp(trigger_name, "none")) {
0013b23d	50	led_trigger_remove(led_cdev);
c3bc9956 RP	51	return count;
	52	}
	53
dc47206e	54	down_read(&triggers_list_lock);
c3bc9956 RP	55	list_for_each_entry(trig, &trigger_list, next_trig) {
c3bc9956 RP	56	if (!strcmp(trigger_name, trig->name)) {
dc47206e	57	down_write(&led_cdev->trigger_lock);
c3bc9956	58	led_trigger_set(led_cdev, trig);
dc47206e	59	up_write(&led_cdev->trigger_lock);
c3bc9956	60
dc47206e	61	up_read(&triggers_list_lock);
c3bc9956 RP	62	return count;
	63	}
	64	}
dc47206e	65	up_read(&triggers_list_lock);
c3bc9956 RP	66
	67	return -EINVAL;
	68	}
4d404fd5	69	EXPORT_SYMBOL_GPL(led_trigger_store);
c3bc9956	70
f8a7c6fe RP	71	ssize_t led_trigger_show(struct device dev, struct device_attribute attr,
f8a7c6fe RP	72	char *buf)
c3bc9956	73	{
f8a7c6fe	74	struct led_classdev *led_cdev = dev_get_drvdata(dev);
c3bc9956 RP	75	struct led_trigger *trig;
	76	int len = 0;
	77
dc47206e RP	78	down_read(&triggers_list_lock);
dc47206e RP	79	down_read(&led_cdev->trigger_lock);
c3bc9956 RP	80
	81	if (!led_cdev->trigger)
	82	len += sprintf(buf+len, "[none] ");
	83	else
	84	len += sprintf(buf+len, "none ");
	85
	86	list_for_each_entry(trig, &trigger_list, next_trig) {
	87	if (led_cdev->trigger && !strcmp(led_cdev->trigger->name,
	88	trig->name))
	89	len += sprintf(buf+len, "[%s] ", trig->name);
	90	else
	91	len += sprintf(buf+len, "%s ", trig->name);
	92	}
dc47206e RP	93	up_read(&led_cdev->trigger_lock);
dc47206e RP	94	up_read(&triggers_list_lock);
c3bc9956 RP	95
	96	len += sprintf(len+buf, "\n");
	97	return len;
	98	}
4d404fd5	99	EXPORT_SYMBOL_GPL(led_trigger_show);
c3bc9956 RP	100
c3bc9956 RP	101	/* Caller must ensure led_cdev->trigger_lock held */
eb202621	102	void led_trigger_set(struct led_classdev led_cdev, struct led_trigger trig)
c3bc9956 RP	103	{
c3bc9956 RP	104	unsigned long flags;
52c47742 CC	105	char *event = NULL;
	106	char *envp[2];
	107	const char *name;
	108
	109	name = trig ? trig->name : "none";
	110	event = kasprintf(GFP_KERNEL, "TRIGGER=%s", name);
c3bc9956 RP	111
	112	/* Remove any existing trigger */
	113	if (led_cdev->trigger) {
	114	write_lock_irqsave(&led_cdev->trigger->leddev_list_lock, flags);
	115	list_del(&led_cdev->trig_list);
4d404fd5 NM	116	write_unlock_irqrestore(&led_cdev->trigger->leddev_list_lock,
4d404fd5 NM	117	flags);
d23a22a7 FB	118	cancel_work_sync(&led_cdev->set_brightness_work);
d23a22a7 FB	119	led_stop_software_blink(led_cdev);
c3bc9956 RP	120	if (led_cdev->trigger->deactivate)
c3bc9956 RP	121	led_cdev->trigger->deactivate(led_cdev);
fe3025b5	122	led_cdev->trigger = NULL;
19cd67e2	123	led_set_brightness(led_cdev, LED_OFF);
c3bc9956	124	}
eb202621 BW	125	if (trig) {
	126	write_lock_irqsave(&trig->leddev_list_lock, flags);
	127	list_add_tail(&led_cdev->trig_list, &trig->led_cdevs);
	128	write_unlock_irqrestore(&trig->leddev_list_lock, flags);
	129	led_cdev->trigger = trig;
	130	if (trig->activate)
	131	trig->activate(led_cdev);
c3bc9956	132	}
52c47742 CC	133
	134	if (event) {
	135	envp[0] = event;
	136	envp[1] = NULL;
	137	kobject_uevent_env(&led_cdev->dev->kobj, KOBJ_CHANGE, envp);
	138	kfree(event);
	139	}
c3bc9956	140	}
4d404fd5	141	EXPORT_SYMBOL_GPL(led_trigger_set);
c3bc9956	142
0013b23d NM	143	void led_trigger_remove(struct led_classdev *led_cdev)
	144	{
	145	down_write(&led_cdev->trigger_lock);
	146	led_trigger_set(led_cdev, NULL);
	147	up_write(&led_cdev->trigger_lock);
	148	}
4d404fd5	149	EXPORT_SYMBOL_GPL(led_trigger_remove);
0013b23d	150
c3bc9956 RP	151	void led_trigger_set_default(struct led_classdev *led_cdev)
	152	{
	153	struct led_trigger *trig;
	154
	155	if (!led_cdev->default_trigger)
	156	return;
	157
dc47206e RP	158	down_read(&triggers_list_lock);
dc47206e RP	159	down_write(&led_cdev->trigger_lock);
c3bc9956 RP	160	list_for_each_entry(trig, &trigger_list, next_trig) {
	161	if (!strcmp(led_cdev->default_trigger, trig->name))
	162	led_trigger_set(led_cdev, trig);
	163	}
dc47206e RP	164	up_write(&led_cdev->trigger_lock);
dc47206e RP	165	up_read(&triggers_list_lock);
c3bc9956	166	}
4d404fd5 NM	167	EXPORT_SYMBOL_GPL(led_trigger_set_default);
4d404fd5 NM	168
a8df7b1a FB	169	void led_trigger_rename_static(const char name, struct led_trigger trig)
	170	{
	171	/* new name must be on a temporary string to prevent races */
	172	BUG_ON(name == trig->name);
	173
	174	down_write(&triggers_list_lock);
	175	/* this assumes that trig->name was originaly allocated to
	176	* non constant storage */
	177	strcpy((char *)trig->name, name);
	178	up_write(&triggers_list_lock);
	179	}
	180	EXPORT_SYMBOL_GPL(led_trigger_rename_static);
	181
4d404fd5	182	/* LED Trigger Interface */
c3bc9956	183
eb202621	184	int led_trigger_register(struct led_trigger *trig)
c3bc9956 RP	185	{
c3bc9956 RP	186	struct led_classdev *led_cdev;
eb202621	187	struct led_trigger *_trig;
c3bc9956	188
eb202621 BW	189	rwlock_init(&trig->leddev_list_lock);
eb202621 BW	190	INIT_LIST_HEAD(&trig->led_cdevs);
c3bc9956	191
dc47206e	192	down_write(&triggers_list_lock);
700c6ea2	193	/* Make sure the trigger's name isn't already in use */
eb202621 BW	194	list_for_each_entry(_trig, &trigger_list, next_trig) {
eb202621 BW	195	if (!strcmp(_trig->name, trig->name)) {
700c6ea2 AN	196	up_write(&triggers_list_lock);
	197	return -EEXIST;
	198	}
	199	}
	200	/* Add to the list of led triggers */
eb202621	201	list_add_tail(&trig->next_trig, &trigger_list);
dc47206e	202	up_write(&triggers_list_lock);
c3bc9956 RP	203
c3bc9956 RP	204	/* Register with any LEDs that have this as a default trigger */
72f8da32	205	down_read(&leds_list_lock);
c3bc9956	206	list_for_each_entry(led_cdev, &leds_list, node) {
dc47206e	207	down_write(&led_cdev->trigger_lock);
c3bc9956	208	if (!led_cdev->trigger && led_cdev->default_trigger &&
eb202621 BW	209	!strcmp(led_cdev->default_trigger, trig->name))
eb202621 BW	210	led_trigger_set(led_cdev, trig);
dc47206e	211	up_write(&led_cdev->trigger_lock);
c3bc9956	212	}
72f8da32	213	up_read(&leds_list_lock);
c3bc9956 RP	214
	215	return 0;
	216	}
4d404fd5	217	EXPORT_SYMBOL_GPL(led_trigger_register);
c3bc9956	218
eb202621	219	void led_trigger_unregister(struct led_trigger *trig)
c3bc9956 RP	220	{
	221	struct led_classdev *led_cdev;
	222
	223	/* Remove from the list of led triggers */
dc47206e	224	down_write(&triggers_list_lock);
eb202621	225	list_del(&trig->next_trig);
dc47206e	226	up_write(&triggers_list_lock);
c3bc9956 RP	227
c3bc9956 RP	228	/* Remove anyone actively using this trigger */
72f8da32	229	down_read(&leds_list_lock);
c3bc9956	230	list_for_each_entry(led_cdev, &leds_list, node) {
dc47206e	231	down_write(&led_cdev->trigger_lock);
eb202621	232	if (led_cdev->trigger == trig)
c3bc9956	233	led_trigger_set(led_cdev, NULL);
dc47206e	234	up_write(&led_cdev->trigger_lock);
c3bc9956	235	}
72f8da32	236	up_read(&leds_list_lock);
c3bc9956	237	}
4d404fd5	238	EXPORT_SYMBOL_GPL(led_trigger_unregister);
c3bc9956	239
4d404fd5 NM	240	/* Simple LED Tigger Interface */
4d404fd5 NM	241
eb202621	242	void led_trigger_event(struct led_trigger *trig,
4d404fd5	243	enum led_brightness brightness)
c3bc9956	244	{
11e043b5	245	struct led_classdev *led_cdev;
4d404fd5	246
eb202621	247	if (!trig)
4d404fd5 NM	248	return;
4d404fd5 NM	249
eb202621	250	read_lock(&trig->leddev_list_lock);
11e043b5	251	list_for_each_entry(led_cdev, &trig->led_cdevs, trig_list)
d23a22a7	252	led_set_brightness(led_cdev, brightness);
eb202621	253	read_unlock(&trig->leddev_list_lock);
c3bc9956	254	}
4d404fd5	255	EXPORT_SYMBOL_GPL(led_trigger_event);
c3bc9956	256
20c0e6b8	257	static void led_trigger_blink_setup(struct led_trigger *trig,
5bb629c5 FB	258	unsigned long *delay_on,
	259	unsigned long *delay_off,
	260	int oneshot,
	261	int invert)
0b9536c9	262	{
11e043b5	263	struct led_classdev *led_cdev;
0b9536c9	264
eb202621	265	if (!trig)
0b9536c9 VK	266	return;
0b9536c9 VK	267
eb202621	268	read_lock(&trig->leddev_list_lock);
11e043b5	269	list_for_each_entry(led_cdev, &trig->led_cdevs, trig_list) {
5bb629c5 FB	270	if (oneshot)
	271	led_blink_set_oneshot(led_cdev, delay_on, delay_off,
	272	invert);
	273	else
	274	led_blink_set(led_cdev, delay_on, delay_off);
0b9536c9	275	}
eb202621	276	read_unlock(&trig->leddev_list_lock);
0b9536c9	277	}
5bb629c5 FB	278
	279	void led_trigger_blink(struct led_trigger *trig,
	280	unsigned long *delay_on,
	281	unsigned long *delay_off)
	282	{
	283	led_trigger_blink_setup(trig, delay_on, delay_off, 0, 0);
	284	}
0b9536c9 VK	285	EXPORT_SYMBOL_GPL(led_trigger_blink);
0b9536c9 VK	286
5bb629c5 FB	287	void led_trigger_blink_oneshot(struct led_trigger *trig,
	288	unsigned long *delay_on,
	289	unsigned long *delay_off,
	290	int invert)
	291	{
	292	led_trigger_blink_setup(trig, delay_on, delay_off, 1, invert);
	293	}
	294	EXPORT_SYMBOL_GPL(led_trigger_blink_oneshot);
	295
4d404fd5 NM	296	void led_trigger_register_simple(const char name, struct led_trigger *tp)
4d404fd5 NM	297	{
eb202621	298	struct led_trigger *trig;
4d404fd5	299	int err;
c3bc9956	300
eb202621	301	trig = kzalloc(sizeof(struct led_trigger), GFP_KERNEL);
c3bc9956	302
eb202621 BW	303	if (trig) {
	304	trig->name = name;
	305	err = led_trigger_register(trig);
cba4c2ac	306	if (err < 0) {
eb202621 BW	307	kfree(trig);
eb202621 BW	308	trig = NULL;
09f5fe75 SK	309	pr_warn("LED trigger %s failed to register (%d)\n",
09f5fe75 SK	310	name, err);
cba4c2ac	311	}
09f5fe75 SK	312	} else {
	313	pr_warn("LED trigger %s failed to register (no memory)\n",
	314	name);
	315	}
eb202621	316	*tp = trig;
4d404fd5	317	}
c3bc9956	318	EXPORT_SYMBOL_GPL(led_trigger_register_simple);
4d404fd5	319
eb202621	320	void led_trigger_unregister_simple(struct led_trigger *trig)
4d404fd5	321	{
eb202621 BW	322	if (trig)
	323	led_trigger_unregister(trig);
	324	kfree(trig);
4d404fd5	325	}
c3bc9956	326	EXPORT_SYMBOL_GPL(led_trigger_unregister_simple);
c3bc9956 RP	327
	328	MODULE_AUTHOR("Richard Purdie");
	329	MODULE_LICENSE("GPL");
	330	MODULE_DESCRIPTION("LED Triggers Core");