[linux-2.6-block.git] / drivers / leds / led-core.c

/*
 * LED Class Core
 *
 * Copyright 2005-2006 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/kernel.h>
#include <linux/leds.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/rwsem.h>
#include "leds.h"

DECLARE_RWSEM(leds_list_lock);
EXPORT_SYMBOL_GPL(leds_list_lock);

LIST_HEAD(leds_list);
EXPORT_SYMBOL_GPL(leds_list);

static int __led_set_brightness(struct led_classdev *led_cdev,
				enum led_brightness value)
{
	if (!led_cdev->brightness_set)
		return -ENOTSUPP;

	led_cdev->brightness_set(led_cdev, value);

	return 0;
}

static int __led_set_brightness_blocking(struct led_classdev *led_cdev,
					 enum led_brightness value)
{
	if (!led_cdev->brightness_set_blocking)
		return -ENOTSUPP;

	return led_cdev->brightness_set_blocking(led_cdev, value);
}

static void led_timer_function(unsigned long data)
{
	struct led_classdev *led_cdev = (void *)data;
	unsigned long brightness;
	unsigned long delay;

	if (!led_cdev->blink_delay_on || !led_cdev->blink_delay_off) {
		led_set_brightness_nosleep(led_cdev, LED_OFF);
		led_cdev->flags &= ~LED_BLINK_SW;
		return;
	}

	if (led_cdev->flags & LED_BLINK_ONESHOT_STOP) {
		led_cdev->flags &=  ~(LED_BLINK_ONESHOT_STOP | LED_BLINK_SW);
		return;
	}

	brightness = led_get_brightness(led_cdev);
	if (!brightness) {
		/* Time to switch the LED on. */
		brightness = led_cdev->blink_brightness;
		delay = led_cdev->blink_delay_on;
	} else {
		/* Store the current brightness value to be able
		 * to restore it when the delay_off period is over.
		 * Do it only if there is no pending blink brightness
		 * change, to avoid overwriting the new value.
		 */
		if (!(led_cdev->flags & LED_BLINK_BRIGHTNESS_CHANGE))
			led_cdev->blink_brightness = brightness;
		else
			led_cdev->flags &= ~LED_BLINK_BRIGHTNESS_CHANGE;
		brightness = LED_OFF;
		delay = led_cdev->blink_delay_off;
	}

	led_set_brightness_nosleep(led_cdev, brightness);

	/* Return in next iteration if led is in one-shot mode and we are in
	 * the final blink state so that the led is toggled each delay_on +
	 * delay_off milliseconds in worst case.
	 */
	if (led_cdev->flags & LED_BLINK_ONESHOT) {
		if (led_cdev->flags & LED_BLINK_INVERT) {
			if (brightness)
				led_cdev->flags |= LED_BLINK_ONESHOT_STOP;
		} else {
			if (!brightness)
				led_cdev->flags |= LED_BLINK_ONESHOT_STOP;
		}
	}

	mod_timer(&led_cdev->blink_timer, jiffies + msecs_to_jiffies(delay));
}

static void set_brightness_delayed(struct work_struct *ws)
{
	struct led_classdev *led_cdev =
		container_of(ws, struct led_classdev, set_brightness_work);
	int ret = 0;

	if (led_cdev->flags & LED_BLINK_DISABLE) {
		led_cdev->delayed_set_value = LED_OFF;
		led_stop_software_blink(led_cdev);
		led_cdev->flags &= ~LED_BLINK_DISABLE;
	}

	ret = __led_set_brightness(led_cdev, led_cdev->delayed_set_value);
	if (ret == -ENOTSUPP)
		ret = __led_set_brightness_blocking(led_cdev,
					led_cdev->delayed_set_value);
	if (ret < 0 &&
	    /* LED HW might have been unplugged, therefore don't warn */
	    !(ret == -ENODEV && (led_cdev->flags & LED_UNREGISTERING) &&
	    (led_cdev->flags & LED_HW_PLUGGABLE)))
		dev_err(led_cdev->dev,
			"Setting an LED's brightness failed (%d)\n", ret);
}

static void led_set_software_blink(struct led_classdev *led_cdev,
				   unsigned long delay_on,
				   unsigned long delay_off)
{
	int current_brightness;

	current_brightness = led_get_brightness(led_cdev);
	if (current_brightness)
		led_cdev->blink_brightness = current_brightness;
	if (!led_cdev->blink_brightness)
		led_cdev->blink_brightness = led_cdev->max_brightness;

	led_cdev->blink_delay_on = delay_on;
	led_cdev->blink_delay_off = delay_off;

	/* never on - just set to off */
	if (!delay_on) {
		led_set_brightness_nosleep(led_cdev, LED_OFF);
		return;
	}

	/* never off - just set to brightness */
	if (!delay_off) {
		led_set_brightness_nosleep(led_cdev,
					   led_cdev->blink_brightness);
		return;
	}

	led_cdev->flags |= LED_BLINK_SW;
	mod_timer(&led_cdev->blink_timer, jiffies + 1);
}


static void led_blink_setup(struct led_classdev *led_cdev,
		     unsigned long *delay_on,
		     unsigned long *delay_off)
{
	if (!(led_cdev->flags & LED_BLINK_ONESHOT) &&
	    led_cdev->blink_set &&
	    !led_cdev->blink_set(led_cdev, delay_on, delay_off))
		return;

	/* blink with 1 Hz as default if nothing specified */
	if (!*delay_on && !*delay_off)
		*delay_on = *delay_off = 500;

	led_set_software_blink(led_cdev, *delay_on, *delay_off);
}

void led_init_core(struct led_classdev *led_cdev)
{
	INIT_WORK(&led_cdev->set_brightness_work, set_brightness_delayed);

	setup_timer(&led_cdev->blink_timer, led_timer_function,
		    (unsigned long)led_cdev);
}
EXPORT_SYMBOL_GPL(led_init_core);

void led_blink_set(struct led_classdev *led_cdev,
		   unsigned long *delay_on,
		   unsigned long *delay_off)
{
	del_timer_sync(&led_cdev->blink_timer);

	led_cdev->flags &= ~LED_BLINK_ONESHOT;
	led_cdev->flags &= ~LED_BLINK_ONESHOT_STOP;

	led_blink_setup(led_cdev, delay_on, delay_off);
}
EXPORT_SYMBOL_GPL(led_blink_set);

void led_blink_set_oneshot(struct led_classdev *led_cdev,
			   unsigned long *delay_on,
			   unsigned long *delay_off,
			   int invert)
{
	if ((led_cdev->flags & LED_BLINK_ONESHOT) &&
	     timer_pending(&led_cdev->blink_timer))
		return;

	led_cdev->flags |= LED_BLINK_ONESHOT;
	led_cdev->flags &= ~LED_BLINK_ONESHOT_STOP;

	if (invert)
		led_cdev->flags |= LED_BLINK_INVERT;
	else
		led_cdev->flags &= ~LED_BLINK_INVERT;

	led_blink_setup(led_cdev, delay_on, delay_off);
}
EXPORT_SYMBOL_GPL(led_blink_set_oneshot);

void led_stop_software_blink(struct led_classdev *led_cdev)
{
	del_timer_sync(&led_cdev->blink_timer);
	led_cdev->blink_delay_on = 0;
	led_cdev->blink_delay_off = 0;
	led_cdev->flags &= ~LED_BLINK_SW;
}
EXPORT_SYMBOL_GPL(led_stop_software_blink);

void led_set_brightness(struct led_classdev *led_cdev,
			enum led_brightness brightness)
{
	/*
	 * If software blink is active, delay brightness setting
	 * until the next timer tick.
	 */
	if (led_cdev->flags & LED_BLINK_SW) {
		/*
		 * If we need to disable soft blinking delegate this to the
		 * work queue task to avoid problems in case we are called
		 * from hard irq context.
		 */
		if (brightness == LED_OFF) {
			led_cdev->flags |= LED_BLINK_DISABLE;
			schedule_work(&led_cdev->set_brightness_work);
		} else {
			led_cdev->flags |= LED_BLINK_BRIGHTNESS_CHANGE;
			led_cdev->blink_brightness = brightness;
		}
		return;
	}

	led_set_brightness_nosleep(led_cdev, brightness);
}
EXPORT_SYMBOL_GPL(led_set_brightness);

void led_set_brightness_nopm(struct led_classdev *led_cdev,
			      enum led_brightness value)
{
	/* Use brightness_set op if available, it is guaranteed not to sleep */
	if (!__led_set_brightness(led_cdev, value))
		return;

	/* If brightness setting can sleep, delegate it to a work queue task */
	led_cdev->delayed_set_value = value;
	schedule_work(&led_cdev->set_brightness_work);
}
EXPORT_SYMBOL_GPL(led_set_brightness_nopm);

void led_set_brightness_nosleep(struct led_classdev *led_cdev,
				enum led_brightness value)
{
	led_cdev->brightness = min(value, led_cdev->max_brightness);

	if (led_cdev->flags & LED_SUSPENDED)
		return;

	led_set_brightness_nopm(led_cdev, led_cdev->brightness);
}
EXPORT_SYMBOL_GPL(led_set_brightness_nosleep);

int led_set_brightness_sync(struct led_classdev *led_cdev,
			    enum led_brightness value)
{
	if (led_cdev->blink_delay_on || led_cdev->blink_delay_off)
		return -EBUSY;

	led_cdev->brightness = min(value, led_cdev->max_brightness);

	if (led_cdev->flags & LED_SUSPENDED)
		return 0;

	return __led_set_brightness_blocking(led_cdev, led_cdev->brightness);
}
EXPORT_SYMBOL_GPL(led_set_brightness_sync);

int led_update_brightness(struct led_classdev *led_cdev)
{
	int ret = 0;

	if (led_cdev->brightness_get) {
		ret = led_cdev->brightness_get(led_cdev);
		if (ret >= 0) {
			led_cdev->brightness = ret;
			return 0;
		}
	}

	return ret;
}
EXPORT_SYMBOL_GPL(led_update_brightness);

/* Caller must ensure led_cdev->led_access held */
void led_sysfs_disable(struct led_classdev *led_cdev)
{
	lockdep_assert_held(&led_cdev->led_access);

	led_cdev->flags |= LED_SYSFS_DISABLE;
}
EXPORT_SYMBOL_GPL(led_sysfs_disable);

/* Caller must ensure led_cdev->led_access held */
void led_sysfs_enable(struct led_classdev *led_cdev)
{
	lockdep_assert_held(&led_cdev->led_access);

	led_cdev->flags &= ~LED_SYSFS_DISABLE;
}
EXPORT_SYMBOL_GPL(led_sysfs_enable);
Commit	Line	Data
c72a1d60 RP	1	/*
	2	* LED Class Core
	3	*
	4	* Copyright 2005-2006 Openedhand Ltd.
	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
	14	#include <linux/kernel.h>
04713306	15	#include <linux/leds.h>
c72a1d60 RP	16	#include <linux/list.h>
c72a1d60 RP	17	#include <linux/module.h>
04713306	18	#include <linux/mutex.h>
72f8da32	19	#include <linux/rwsem.h>
c72a1d60 RP	20	#include "leds.h"
c72a1d60 RP	21
72f8da32	22	DECLARE_RWSEM(leds_list_lock);
4d404fd5	23	EXPORT_SYMBOL_GPL(leds_list_lock);
c72a1d60	24
4d404fd5	25	LIST_HEAD(leds_list);
c72a1d60	26	EXPORT_SYMBOL_GPL(leds_list);
a403d930	27
d4887af9 HK	28	static int __led_set_brightness(struct led_classdev *led_cdev,
	29	enum led_brightness value)
	30	{
	31	if (!led_cdev->brightness_set)
	32	return -ENOTSUPP;
	33
	34	led_cdev->brightness_set(led_cdev, value);
	35
	36	return 0;
	37	}
	38
	39	static int __led_set_brightness_blocking(struct led_classdev *led_cdev,
	40	enum led_brightness value)
	41	{
	42	if (!led_cdev->brightness_set_blocking)
	43	return -ENOTSUPP;
	44
	45	return led_cdev->brightness_set_blocking(led_cdev, value);
	46	}
	47
757b06ae JA	48	static void led_timer_function(unsigned long data)
	49	{
	50	struct led_classdev led_cdev = (void )data;
	51	unsigned long brightness;
	52	unsigned long delay;
	53
	54	if (!led_cdev->blink_delay_on \|\| !led_cdev->blink_delay_off) {
81fe8e5b	55	led_set_brightness_nosleep(led_cdev, LED_OFF);
7cfe749f	56	led_cdev->flags &= ~LED_BLINK_SW;
757b06ae JA	57	return;
	58	}
	59
	60	if (led_cdev->flags & LED_BLINK_ONESHOT_STOP) {
7cfe749f	61	led_cdev->flags &= ~(LED_BLINK_ONESHOT_STOP \| LED_BLINK_SW);
757b06ae JA	62	return;
	63	}
	64
	65	brightness = led_get_brightness(led_cdev);
	66	if (!brightness) {
	67	/* Time to switch the LED on. */
757b06ae JA	68	brightness = led_cdev->blink_brightness;
	69	delay = led_cdev->blink_delay_on;
	70	} else {
	71	/* Store the current brightness value to be able
	72	* to restore it when the delay_off period is over.
f1e80c07 JA	73	* Do it only if there is no pending blink brightness
f1e80c07 JA	74	* change, to avoid overwriting the new value.
757b06ae	75	*/
f1e80c07 JA	76	if (!(led_cdev->flags & LED_BLINK_BRIGHTNESS_CHANGE))
	77	led_cdev->blink_brightness = brightness;
	78	else
	79	led_cdev->flags &= ~LED_BLINK_BRIGHTNESS_CHANGE;
757b06ae JA	80	brightness = LED_OFF;
	81	delay = led_cdev->blink_delay_off;
	82	}
	83
81fe8e5b	84	led_set_brightness_nosleep(led_cdev, brightness);
757b06ae JA	85
	86	/* Return in next iteration if led is in one-shot mode and we are in
	87	* the final blink state so that the led is toggled each delay_on +
	88	* delay_off milliseconds in worst case.
	89	*/
	90	if (led_cdev->flags & LED_BLINK_ONESHOT) {
	91	if (led_cdev->flags & LED_BLINK_INVERT) {
	92	if (brightness)
	93	led_cdev->flags \|= LED_BLINK_ONESHOT_STOP;
	94	} else {
	95	if (!brightness)
	96	led_cdev->flags \|= LED_BLINK_ONESHOT_STOP;
	97	}
	98	}
	99
	100	mod_timer(&led_cdev->blink_timer, jiffies + msecs_to_jiffies(delay));
	101	}
	102
	103	static void set_brightness_delayed(struct work_struct *ws)
	104	{
	105	struct led_classdev *led_cdev =
	106	container_of(ws, struct led_classdev, set_brightness_work);
1afcadfc	107	int ret = 0;
757b06ae	108
f1e80c07 JA	109	if (led_cdev->flags & LED_BLINK_DISABLE) {
	110	led_cdev->delayed_set_value = LED_OFF;
	111	led_stop_software_blink(led_cdev);
	112	led_cdev->flags &= ~LED_BLINK_DISABLE;
	113	}
757b06ae	114
d4887af9 HK	115	ret = __led_set_brightness(led_cdev, led_cdev->delayed_set_value);
	116	if (ret == -ENOTSUPP)
	117	ret = __led_set_brightness_blocking(led_cdev,
	118	led_cdev->delayed_set_value);
d84d80f3 HK	119	if (ret < 0 &&
	120	/* LED HW might have been unplugged, therefore don't warn */
	121	!(ret == -ENODEV && (led_cdev->flags & LED_UNREGISTERING) &&
	122	(led_cdev->flags & LED_HW_PLUGGABLE)))
1afcadfc JA	123	dev_err(led_cdev->dev,
1afcadfc JA	124	"Setting an LED's brightness failed (%d)\n", ret);
757b06ae JA	125	}
757b06ae JA	126
a403d930 BW	127	static void led_set_software_blink(struct led_classdev *led_cdev,
	128	unsigned long delay_on,
	129	unsigned long delay_off)
	130	{
	131	int current_brightness;
	132
	133	current_brightness = led_get_brightness(led_cdev);
	134	if (current_brightness)
	135	led_cdev->blink_brightness = current_brightness;
	136	if (!led_cdev->blink_brightness)
	137	led_cdev->blink_brightness = led_cdev->max_brightness;
	138
a403d930 BW	139	led_cdev->blink_delay_on = delay_on;
	140	led_cdev->blink_delay_off = delay_off;
	141
8d82fef8 SS	142	/* never on - just set to off */
8d82fef8 SS	143	if (!delay_on) {
81fe8e5b	144	led_set_brightness_nosleep(led_cdev, LED_OFF);
a403d930	145	return;
8d82fef8	146	}
a403d930 BW	147
	148	/* never off - just set to brightness */
	149	if (!delay_off) {
81fe8e5b JA	150	led_set_brightness_nosleep(led_cdev,
81fe8e5b JA	151	led_cdev->blink_brightness);
a403d930 BW	152	return;
	153	}
	154
7cfe749f	155	led_cdev->flags \|= LED_BLINK_SW;
9067359f	156	mod_timer(&led_cdev->blink_timer, jiffies + 1);
a403d930 BW	157	}
	158
	159
20c0e6b8	160	static void led_blink_setup(struct led_classdev *led_cdev,
5bb629c5 FB	161	unsigned long *delay_on,
5bb629c5 FB	162	unsigned long *delay_off)
a403d930	163	{
5bb629c5 FB	164	if (!(led_cdev->flags & LED_BLINK_ONESHOT) &&
5bb629c5 FB	165	led_cdev->blink_set &&
a403d930 BW	166	!led_cdev->blink_set(led_cdev, delay_on, delay_off))
	167	return;
	168
	169	/* blink with 1 Hz as default if nothing specified */
	170	if (!delay_on && !delay_off)
	171	delay_on = delay_off = 500;
	172
	173	led_set_software_blink(led_cdev, delay_on, delay_off);
	174	}
5bb629c5	175
757b06ae JA	176	void led_init_core(struct led_classdev *led_cdev)
	177	{
	178	INIT_WORK(&led_cdev->set_brightness_work, set_brightness_delayed);
	179
	180	setup_timer(&led_cdev->blink_timer, led_timer_function,
	181	(unsigned long)led_cdev);
	182	}
	183	EXPORT_SYMBOL_GPL(led_init_core);
	184
5bb629c5 FB	185	void led_blink_set(struct led_classdev *led_cdev,
	186	unsigned long *delay_on,
	187	unsigned long *delay_off)
	188	{
9067359f	189	del_timer_sync(&led_cdev->blink_timer);
5bb629c5 FB	190
	191	led_cdev->flags &= ~LED_BLINK_ONESHOT;
	192	led_cdev->flags &= ~LED_BLINK_ONESHOT_STOP;
	193
	194	led_blink_setup(led_cdev, delay_on, delay_off);
	195	}
2806e2ff	196	EXPORT_SYMBOL_GPL(led_blink_set);
a403d930	197
5bb629c5 FB	198	void led_blink_set_oneshot(struct led_classdev *led_cdev,
	199	unsigned long *delay_on,
	200	unsigned long *delay_off,
	201	int invert)
	202	{
	203	if ((led_cdev->flags & LED_BLINK_ONESHOT) &&
9067359f	204	timer_pending(&led_cdev->blink_timer))
5bb629c5 FB	205	return;
	206
	207	led_cdev->flags \|= LED_BLINK_ONESHOT;
	208	led_cdev->flags &= ~LED_BLINK_ONESHOT_STOP;
	209
	210	if (invert)
	211	led_cdev->flags \|= LED_BLINK_INVERT;
	212	else
	213	led_cdev->flags &= ~LED_BLINK_INVERT;
	214
	215	led_blink_setup(led_cdev, delay_on, delay_off);
	216	}
2806e2ff	217	EXPORT_SYMBOL_GPL(led_blink_set_oneshot);
5bb629c5	218
d23a22a7	219	void led_stop_software_blink(struct led_classdev *led_cdev)
a403d930	220	{
9067359f	221	del_timer_sync(&led_cdev->blink_timer);
43786482 FB	222	led_cdev->blink_delay_on = 0;
43786482 FB	223	led_cdev->blink_delay_off = 0;
7cfe749f	224	led_cdev->flags &= ~LED_BLINK_SW;
d23a22a7 FB	225	}
	226	EXPORT_SYMBOL_GPL(led_stop_software_blink);
	227
	228	void led_set_brightness(struct led_classdev *led_cdev,
	229	enum led_brightness brightness)
	230	{
f1e80c07	231	/*
7cfe749f	232	* If software blink is active, delay brightness setting
f1e80c07 JA	233	* until the next timer tick.
f1e80c07 JA	234	*/
7cfe749f	235	if (led_cdev->flags & LED_BLINK_SW) {
f1e80c07 JA	236	/*
	237	* If we need to disable soft blinking delegate this to the
	238	* work queue task to avoid problems in case we are called
	239	* from hard irq context.
	240	*/
	241	if (brightness == LED_OFF) {
	242	led_cdev->flags \|= LED_BLINK_DISABLE;
76931edd	243	schedule_work(&led_cdev->set_brightness_work);
f1e80c07 JA	244	} else {
	245	led_cdev->flags \|= LED_BLINK_BRIGHTNESS_CHANGE;
	246	led_cdev->blink_brightness = brightness;
	247	}
d23a22a7 FB	248	return;
d23a22a7 FB	249	}
43786482	250
13ae79bb	251	led_set_brightness_nosleep(led_cdev, brightness);
a403d930	252	}
2806e2ff	253	EXPORT_SYMBOL_GPL(led_set_brightness);
3ef7de53	254
81fe8e5b JA	255	void led_set_brightness_nopm(struct led_classdev *led_cdev,
	256	enum led_brightness value)
	257	{
	258	/* Use brightness_set op if available, it is guaranteed not to sleep */
d4887af9	259	if (!__led_set_brightness(led_cdev, value))
81fe8e5b	260	return;
81fe8e5b JA	261
	262	/* If brightness setting can sleep, delegate it to a work queue task */
	263	led_cdev->delayed_set_value = value;
	264	schedule_work(&led_cdev->set_brightness_work);
	265	}
	266	EXPORT_SYMBOL_GPL(led_set_brightness_nopm);
	267
	268	void led_set_brightness_nosleep(struct led_classdev *led_cdev,
	269	enum led_brightness value)
	270	{
	271	led_cdev->brightness = min(value, led_cdev->max_brightness);
	272
	273	if (led_cdev->flags & LED_SUSPENDED)
	274	return;
	275
	276	led_set_brightness_nopm(led_cdev, led_cdev->brightness);
	277	}
	278	EXPORT_SYMBOL_GPL(led_set_brightness_nosleep);
	279
13ae79bb JA	280	int led_set_brightness_sync(struct led_classdev *led_cdev,
	281	enum led_brightness value)
	282	{
	283	if (led_cdev->blink_delay_on \|\| led_cdev->blink_delay_off)
	284	return -EBUSY;
	285
	286	led_cdev->brightness = min(value, led_cdev->max_brightness);
	287
	288	if (led_cdev->flags & LED_SUSPENDED)
	289	return 0;
	290
d4887af9	291	return __led_set_brightness_blocking(led_cdev, led_cdev->brightness);
13ae79bb JA	292	}
	293	EXPORT_SYMBOL_GPL(led_set_brightness_sync);
	294
3ef7de53 JA	295	int led_update_brightness(struct led_classdev *led_cdev)
	296	{
	297	int ret = 0;
	298
	299	if (led_cdev->brightness_get) {
	300	ret = led_cdev->brightness_get(led_cdev);
	301	if (ret >= 0) {
	302	led_cdev->brightness = ret;
	303	return 0;
	304	}
	305	}
	306
	307	return ret;
	308	}
2806e2ff	309	EXPORT_SYMBOL_GPL(led_update_brightness);
acd899e4 JA	310
	311	/* Caller must ensure led_cdev->led_access held */
	312	void led_sysfs_disable(struct led_classdev *led_cdev)
	313	{
	314	lockdep_assert_held(&led_cdev->led_access);
	315
	316	led_cdev->flags \|= LED_SYSFS_DISABLE;
	317	}
	318	EXPORT_SYMBOL_GPL(led_sysfs_disable);
	319
	320	/* Caller must ensure led_cdev->led_access held */
	321	void led_sysfs_enable(struct led_classdev *led_cdev)
	322	{
	323	lockdep_assert_held(&led_cdev->led_access);
	324
	325	led_cdev->flags &= ~LED_SYSFS_DISABLE;
	326	}
	327	EXPORT_SYMBOL_GPL(led_sysfs_enable);