Commit 7aea8389 authored by Jacek Anaszewski's avatar Jacek Anaszewski Committed by Bryan Wu
Browse files

leds: Add LED Flash class extension to the LED subsystem 



Some LED devices support two operation modes - torch and flash.
This patch provides support for flash LED devices in the LED subsystem
by introducing new sysfs attributes and kernel internal interface.
The attributes being introduced are: flash_brightness, flash_strobe,
flash_timeout, max_flash_timeout, max_flash_brightness, flash_fault,
flash_sync_strobe and available_sync_leds. All the flash related
features are placed in a separate module.

The modifications aim to be compatible with V4L2 framework requirements
related to the flash devices management. The design assumes that V4L2
sub-device can take of the LED class device control and communicate
with it through the kernel internal interface. When V4L2 Flash sub-device
file is opened, the LED class device sysfs interface is made
unavailable.

Signed-off-by: default avatarJacek Anaszewski <j.anaszewski@samsung.com>
Acked-by: default avatarKyungmin Park <kyungmin.park@samsung.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Acked-by: default avatarPavel Machek <pavel@ucw.cz>
Signed-off-by: default avatarBryan Wu <cooloney@gmail.com>
parent 452bc149

drivers/leds/Kconfig

+10 −0
Original line number Diff line number Diff line
@@ -22,6 +22,16 @@ config LEDS_CLASS 
	  This option enables the led sysfs class in /sys/class/leds.  You'll

	  need this to do anything useful with LEDs.  If unsure, say N.



config LEDS_CLASS_FLASH

	tristate "LED Flash Class Support"

	depends on LEDS_CLASS

	help

	  This option enables the flash led sysfs class in /sys/class/leds.

	  It wrapps LED Class and adds flash LEDs specific sysfs attributes

	  and kernel internal API to it. You'll need this to provide support

	  for the flash related features of a LED device. It can be built

	  as a module.



comment "LED drivers"



config LEDS_88PM860X

drivers/leds/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -2,6 +2,7 @@ 
# LED Core

obj-$(CONFIG_NEW_LEDS)			+= led-core.o

obj-$(CONFIG_LEDS_CLASS)		+= led-class.o

obj-$(CONFIG_LEDS_CLASS_FLASH)		+= led-class-flash.o

obj-$(CONFIG_LEDS_TRIGGERS)		+= led-triggers.o



# LED Platform Drivers

drivers/leds/led-class-flash.c

0 → 100644
+486 −0
Original line number Diff line number Diff line 
/*

 * LED Flash class interface

 *

 * Copyright (C) 2015 Samsung Electronics Co., Ltd.

 * Author: Jacek Anaszewski <j.anaszewski@samsung.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/device.h>

#include <linux/init.h>

#include <linux/led-class-flash.h>

#include <linux/leds.h>

#include <linux/module.h>

#include <linux/slab.h>

#include "leds.h"



#define has_flash_op(fled_cdev, op)				\

	(fled_cdev && fled_cdev->ops->op)



#define call_flash_op(fled_cdev, op, args...)		\

	((has_flash_op(fled_cdev, op)) ?			\

			(fled_cdev->ops->op(fled_cdev, args)) :	\

			-EINVAL)



static const char * const led_flash_fault_names[] = {

	"led-over-voltage",

	"flash-timeout-exceeded",

	"controller-over-temperature",

	"controller-short-circuit",

	"led-power-supply-over-current",

	"indicator-led-fault",

	"led-under-voltage",

	"controller-under-voltage",

	"led-over-temperature",

};



static ssize_t flash_brightness_store(struct device *dev,

		struct device_attribute *attr, const char *buf, size_t size)

{

	struct led_classdev *led_cdev = dev_get_drvdata(dev);

	struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev);

	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;



	ret = led_set_flash_brightness(fled_cdev, state);

	if (ret < 0)

		goto unlock;



	ret = size;

unlock:

	mutex_unlock(&led_cdev->led_access);

	return ret;

}



static ssize_t flash_brightness_show(struct device *dev,

		struct device_attribute *attr, char *buf)

{

	struct led_classdev *led_cdev = dev_get_drvdata(dev);

	struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev);



	/* no lock needed for this */

	led_update_flash_brightness(fled_cdev);



	return sprintf(buf, "%u\n", fled_cdev->brightness.val);

}

static DEVICE_ATTR_RW(flash_brightness);



static ssize_t max_flash_brightness_show(struct device *dev,

		struct device_attribute *attr, char *buf)

{

	struct led_classdev *led_cdev = dev_get_drvdata(dev);

	struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev);



	return sprintf(buf, "%u\n", fled_cdev->brightness.max);

}

static DEVICE_ATTR_RO(max_flash_brightness);



static ssize_t flash_strobe_store(struct device *dev,

		struct device_attribute *attr, const char *buf, size_t size)

{

	struct led_classdev *led_cdev = dev_get_drvdata(dev);

	struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev);

	unsigned long state;

	ssize_t ret = -EINVAL;



	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 < 0 || state > 1) {

		ret = -EINVAL;

		goto unlock;

	}



	ret = led_set_flash_strobe(fled_cdev, state);

	if (ret < 0)

		goto unlock;

	ret = size;

unlock:

	mutex_unlock(&led_cdev->led_access);

	return ret;

}



static ssize_t flash_strobe_show(struct device *dev,

		struct device_attribute *attr, char *buf)

{

	struct led_classdev *led_cdev = dev_get_drvdata(dev);

	struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev);

	bool state;

	int ret;



	/* no lock needed for this */

	ret = led_get_flash_strobe(fled_cdev, &state);

	if (ret < 0)

		return ret;



	return sprintf(buf, "%u\n", state);

}

static DEVICE_ATTR_RW(flash_strobe);



static ssize_t flash_timeout_store(struct device *dev,

		struct device_attribute *attr, const char *buf, size_t size)

{

	struct led_classdev *led_cdev = dev_get_drvdata(dev);

	struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev);

	unsigned long flash_timeout;

	ssize_t ret;



	mutex_lock(&led_cdev->led_access);



	if (led_sysfs_is_disabled(led_cdev)) {

		ret = -EBUSY;

		goto unlock;

	}



	ret = kstrtoul(buf, 10, &flash_timeout);

	if (ret)

		goto unlock;



	ret = led_set_flash_timeout(fled_cdev, flash_timeout);

	if (ret < 0)

		goto unlock;



	ret = size;

unlock:

	mutex_unlock(&led_cdev->led_access);

	return ret;

}



static ssize_t flash_timeout_show(struct device *dev,

		struct device_attribute *attr, char *buf)

{

	struct led_classdev *led_cdev = dev_get_drvdata(dev);

	struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev);



	return sprintf(buf, "%u\n", fled_cdev->timeout.val);

}

static DEVICE_ATTR_RW(flash_timeout);



static ssize_t max_flash_timeout_show(struct device *dev,

		struct device_attribute *attr, char *buf)

{

	struct led_classdev *led_cdev = dev_get_drvdata(dev);

	struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev);



	return sprintf(buf, "%u\n", fled_cdev->timeout.max);

}

static DEVICE_ATTR_RO(max_flash_timeout);



static ssize_t flash_fault_show(struct device *dev,

		struct device_attribute *attr, char *buf)

{

	struct led_classdev *led_cdev = dev_get_drvdata(dev);

	struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev);

	u32 fault, mask = 0x1;

	char *pbuf = buf;

	int i, ret, buf_len;



	ret = led_get_flash_fault(fled_cdev, &fault);

	if (ret < 0)

		return -EINVAL;



	*buf = '\0';



	for (i = 0; i < LED_NUM_FLASH_FAULTS; ++i) {

		if (fault & mask) {

			buf_len = sprintf(pbuf, "%s ",

					  led_flash_fault_names[i]);

			pbuf += buf_len;

		}

		mask <<= 1;

	}



	return sprintf(buf, "%s\n", buf);

}

static DEVICE_ATTR_RO(flash_fault);



static ssize_t available_sync_leds_show(struct device *dev,

		struct device_attribute *attr, char *buf)

{

	struct led_classdev *led_cdev = dev_get_drvdata(dev);

	struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev);

	char *pbuf = buf;

	int i, buf_len;



	buf_len = sprintf(pbuf, "[0: none] ");

	pbuf += buf_len;



	for (i = 0; i < fled_cdev->num_sync_leds; ++i) {

		buf_len = sprintf(pbuf, "[%d: %s] ", i + 1,

				  fled_cdev->sync_leds[i]->led_cdev.name);

		pbuf += buf_len;

	}



	return sprintf(buf, "%s\n", buf);

}

static DEVICE_ATTR_RO(available_sync_leds);



static ssize_t flash_sync_strobe_store(struct device *dev,

		struct device_attribute *attr, const char *buf, size_t size)

{

	struct led_classdev *led_cdev = dev_get_drvdata(dev);

	struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev);

	unsigned long led_id;

	ssize_t ret;



	mutex_lock(&led_cdev->led_access);



	if (led_sysfs_is_disabled(led_cdev)) {

		ret = -EBUSY;

		goto unlock;

	}



	ret = kstrtoul(buf, 10, &led_id);

	if (ret)

		goto unlock;



	if (led_id > fled_cdev->num_sync_leds) {

		ret = -ERANGE;

		goto unlock;

	}



	fled_cdev->sync_led_id = led_id;



	ret = size;

unlock:

	mutex_unlock(&led_cdev->led_access);

	return ret;

}



static ssize_t flash_sync_strobe_show(struct device *dev,

		struct device_attribute *attr, char *buf)

{

	struct led_classdev *led_cdev = dev_get_drvdata(dev);

	struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev);

	int sled_id = fled_cdev->sync_led_id;

	char *sync_led_name = "none";



	if (fled_cdev->sync_led_id > 0)

		sync_led_name = (char *)

			fled_cdev->sync_leds[sled_id - 1]->led_cdev.name;



	return sprintf(buf, "[%d: %s]\n", sled_id, sync_led_name);

}

static DEVICE_ATTR_RW(flash_sync_strobe);



static struct attribute *led_flash_strobe_attrs[] = {

	&dev_attr_flash_strobe.attr,

	NULL,

};



static struct attribute *led_flash_timeout_attrs[] = {

	&dev_attr_flash_timeout.attr,

	&dev_attr_max_flash_timeout.attr,

	NULL,

};



static struct attribute *led_flash_brightness_attrs[] = {

	&dev_attr_flash_brightness.attr,

	&dev_attr_max_flash_brightness.attr,

	NULL,

};



static struct attribute *led_flash_fault_attrs[] = {

	&dev_attr_flash_fault.attr,

	NULL,

};



static struct attribute *led_flash_sync_strobe_attrs[] = {

	&dev_attr_available_sync_leds.attr,

	&dev_attr_flash_sync_strobe.attr,

	NULL,

};



static const struct attribute_group led_flash_strobe_group = {

	.attrs = led_flash_strobe_attrs,

};



static const struct attribute_group led_flash_timeout_group = {

	.attrs = led_flash_timeout_attrs,

};



static const struct attribute_group led_flash_brightness_group = {

	.attrs = led_flash_brightness_attrs,

};



static const struct attribute_group led_flash_fault_group = {

	.attrs = led_flash_fault_attrs,

};



static const struct attribute_group led_flash_sync_strobe_group = {

	.attrs = led_flash_sync_strobe_attrs,

};



static void led_flash_resume(struct led_classdev *led_cdev)

{

	struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev);



	call_flash_op(fled_cdev, flash_brightness_set,

					fled_cdev->brightness.val);

	call_flash_op(fled_cdev, timeout_set, fled_cdev->timeout.val);

}



static void led_flash_init_sysfs_groups(struct led_classdev_flash *fled_cdev)

{

	struct led_classdev *led_cdev = &fled_cdev->led_cdev;

	const struct led_flash_ops *ops = fled_cdev->ops;

	const struct attribute_group **flash_groups = fled_cdev->sysfs_groups;



	int num_sysfs_groups = 0;



	flash_groups[num_sysfs_groups++] = &led_flash_strobe_group;



	if (ops->flash_brightness_set)

		flash_groups[num_sysfs_groups++] = &led_flash_brightness_group;



	if (ops->timeout_set)

		flash_groups[num_sysfs_groups++] = &led_flash_timeout_group;



	if (ops->fault_get)

		flash_groups[num_sysfs_groups++] = &led_flash_fault_group;



	if (led_cdev->flags & LED_DEV_CAP_SYNC_STROBE)

		flash_groups[num_sysfs_groups++] = &led_flash_sync_strobe_group;



	led_cdev->groups = flash_groups;

}



int led_classdev_flash_register(struct device *parent,

				struct led_classdev_flash *fled_cdev)

{

	struct led_classdev *led_cdev;

	const struct led_flash_ops *ops;

	int ret;



	if (!fled_cdev)

		return -EINVAL;



	led_cdev = &fled_cdev->led_cdev;



	if (led_cdev->flags & LED_DEV_CAP_FLASH) {

		if (!led_cdev->brightness_set_sync)

			return -EINVAL;



		ops = fled_cdev->ops;

		if (!ops || !ops->strobe_set)

			return -EINVAL;



		led_cdev->flash_resume = led_flash_resume;



		/* Select the sysfs attributes to be created for the device */

		led_flash_init_sysfs_groups(fled_cdev);

	}



	/* Register led class device */

	ret = led_classdev_register(parent, led_cdev);

	if (ret < 0)

		return ret;



	/* Setting a torch brightness needs to have immediate effect */

	led_cdev->flags &= ~SET_BRIGHTNESS_ASYNC;

	led_cdev->flags |= SET_BRIGHTNESS_SYNC;



	return 0;

}

EXPORT_SYMBOL_GPL(led_classdev_flash_register);



void led_classdev_flash_unregister(struct led_classdev_flash *fled_cdev)

{

	if (!fled_cdev)

		return;



	led_classdev_unregister(&fled_cdev->led_cdev);

}

EXPORT_SYMBOL_GPL(led_classdev_flash_unregister);



static void led_clamp_align(struct led_flash_setting *s)

{

	u32 v, offset;



	v = s->val + s->step / 2;

	v = clamp(v, s->min, s->max);

	offset = v - s->min;

	offset = s->step * (offset / s->step);

	s->val = s->min + offset;

}



int led_set_flash_timeout(struct led_classdev_flash *fled_cdev, u32 timeout)

{

	struct led_classdev *led_cdev = &fled_cdev->led_cdev;

	struct led_flash_setting *s = &fled_cdev->timeout;



	s->val = timeout;

	led_clamp_align(s);



	if (!(led_cdev->flags & LED_SUSPENDED))

		return call_flash_op(fled_cdev, timeout_set, s->val);



	return 0;

}

EXPORT_SYMBOL_GPL(led_set_flash_timeout);



int led_get_flash_fault(struct led_classdev_flash *fled_cdev, u32 *fault)

{

	return call_flash_op(fled_cdev, fault_get, fault);

}

EXPORT_SYMBOL_GPL(led_get_flash_fault);



int led_set_flash_brightness(struct led_classdev_flash *fled_cdev,

				u32 brightness)

{

	struct led_classdev *led_cdev = &fled_cdev->led_cdev;

	struct led_flash_setting *s = &fled_cdev->brightness;



	s->val = brightness;

	led_clamp_align(s);



	if (!(led_cdev->flags & LED_SUSPENDED))

		return call_flash_op(fled_cdev, flash_brightness_set, s->val);



	return 0;

}

EXPORT_SYMBOL_GPL(led_set_flash_brightness);



int led_update_flash_brightness(struct led_classdev_flash *fled_cdev)

{

	struct led_flash_setting *s = &fled_cdev->brightness;

	u32 brightness;



	if (has_flash_op(fled_cdev, flash_brightness_get)) {

		int ret = call_flash_op(fled_cdev, flash_brightness_get,

						&brightness);

		if (ret < 0)

			return ret;



		s->val = brightness;

	}



	return 0;

}

EXPORT_SYMBOL_GPL(led_update_flash_brightness);



MODULE_AUTHOR("Jacek Anaszewski <j.anaszewski@samsung.com>");

MODULE_DESCRIPTION("LED Flash class interface");

MODULE_LICENSE("GPL v2");

drivers/leds/led-class.c

+4 −0
Original line number Diff line number Diff line
@@ -179,6 +179,10 @@ EXPORT_SYMBOL_GPL(led_classdev_suspend); 
void led_classdev_resume(struct led_classdev *led_cdev)

{

	led_cdev->brightness_set(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);

include/linux/led-class-flash.h

0 → 100644
+207 −0
Original line number Diff line number Diff line 
/*

 * LED Flash class interface

 *

 * Copyright (C) 2015 Samsung Electronics Co., Ltd.

 * Author: Jacek Anaszewski <j.anaszewski@samsung.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.

 *

 */

#ifndef __LINUX_FLASH_LEDS_H_INCLUDED

#define __LINUX_FLASH_LEDS_H_INCLUDED



#include <linux/leds.h>

#include <uapi/linux/v4l2-controls.h>



struct device_node;

struct led_classdev_flash;



/*

 * Supported led fault bits - must be kept in synch

 * with V4L2_FLASH_FAULT bits.

 */

#define LED_FAULT_OVER_VOLTAGE		(1 << 0)

#define LED_FAULT_TIMEOUT		(1 << 1)

#define LED_FAULT_OVER_TEMPERATURE	(1 << 2)

#define LED_FAULT_SHORT_CIRCUIT		(1 << 3)

#define LED_FAULT_OVER_CURRENT		(1 << 4)

#define LED_FAULT_INDICATOR		(1 << 5)

#define LED_FAULT_UNDER_VOLTAGE		(1 << 6)

#define LED_FAULT_INPUT_VOLTAGE		(1 << 7)

#define LED_FAULT_LED_OVER_TEMPERATURE	(1 << 8)

#define LED_NUM_FLASH_FAULTS		9



#define LED_FLASH_MAX_SYSFS_GROUPS 7



struct led_flash_ops {

	/* set flash brightness */

	int (*flash_brightness_set)(struct led_classdev_flash *fled_cdev,

					u32 brightness);

	/* get flash brightness */

	int (*flash_brightness_get)(struct led_classdev_flash *fled_cdev,

					u32 *brightness);

	/* set flash strobe state */

	int (*strobe_set)(struct led_classdev_flash *fled_cdev, bool state);

	/* get flash strobe state */

	int (*strobe_get)(struct led_classdev_flash *fled_cdev, bool *state);

	/* set flash timeout */

	int (*timeout_set)(struct led_classdev_flash *fled_cdev, u32 timeout);

	/* get the flash LED fault */

	int (*fault_get)(struct led_classdev_flash *fled_cdev, u32 *fault);

};



/*

 * Current value of a flash setting along

 * with its constraints.

 */

struct led_flash_setting {

	/* maximum allowed value */

	u32 min;

	/* maximum allowed value */

	u32 max;

	/* step value */

	u32 step;

	/* current value */

	u32 val;

};



struct led_classdev_flash {

	/* led class device */

	struct led_classdev led_cdev;



	/* flash led specific ops */

	const struct led_flash_ops *ops;



	/* flash brightness value in microamperes along with its constraints */

	struct led_flash_setting brightness;



	/* flash timeout value in microseconds along with its constraints */

	struct led_flash_setting timeout;



	/* LED Flash class sysfs groups */

	const struct attribute_group *sysfs_groups[LED_FLASH_MAX_SYSFS_GROUPS];



	/* LEDs available for flash strobe synchronization */

	struct led_classdev_flash **sync_leds;



	/* Number of LEDs available for flash strobe synchronization */

	int num_sync_leds;



	/*

	 * The identifier of the sub-led to synchronize the flash strobe with.

	 * Identifiers start from 1, which reflects the first element from the

	 * sync_leds array. 0 means that the flash strobe should not be

	 * synchronized.

	 */

	u32 sync_led_id;

};



static inline struct led_classdev_flash *lcdev_to_flcdev(

						struct led_classdev *lcdev)

{

	return container_of(lcdev, struct led_classdev_flash, led_cdev);

}



/**

 * led_classdev_flash_register - register a new object of led_classdev class

 *				 with support for flash LEDs

 * @parent: the flash LED to register

 * @fled_cdev: the led_classdev_flash structure for this device

 *

 * Returns: 0 on success or negative error value on failure

 */

extern int led_classdev_flash_register(struct device *parent,

				struct led_classdev_flash *fled_cdev);



/**

 * led_classdev_flash_unregister - unregisters an object of led_classdev class

 *				   with support for flash LEDs

 * @fled_cdev: the flash LED to unregister

 *

 * Unregister a previously registered via led_classdev_flash_register object

 */

extern void led_classdev_flash_unregister(struct led_classdev_flash *fled_cdev);



/**

 * led_set_flash_strobe - setup flash strobe

 * @fled_cdev: the flash LED to set strobe on

 * @state: 1 - strobe flash, 0 - stop flash strobe

 *

 * Strobe the flash LED.

 *

 * Returns: 0 on success or negative error value on failure

 */

static inline int led_set_flash_strobe(struct led_classdev_flash *fled_cdev,

					bool state)

{

	return fled_cdev->ops->strobe_set(fled_cdev, state);

}



/**

 * led_get_flash_strobe - get flash strobe status

 * @fled_cdev: the flash LED to query

 * @state: 1 - flash is strobing, 0 - flash is off

 *

 * Check whether the flash is strobing at the moment.

 *

 * Returns: 0 on success or negative error value on failure

 */

static inline int led_get_flash_strobe(struct led_classdev_flash *fled_cdev,

					bool *state)

{

	if (fled_cdev->ops->strobe_get)

		return fled_cdev->ops->strobe_get(fled_cdev, state);



	return -EINVAL;

}



/**

 * led_set_flash_brightness - set flash LED brightness

 * @fled_cdev: the flash LED to set

 * @brightness: the brightness to set it to

 *

 * Set a flash LED's brightness.

 *

 * Returns: 0 on success or negative error value on failure

 */

extern int led_set_flash_brightness(struct led_classdev_flash *fled_cdev,

					u32 brightness);



/**

 * led_update_flash_brightness - update flash LED brightness

 * @fled_cdev: the flash LED to query

 *

 * Get a flash LED's current brightness and update led_flash->brightness

 * member with the obtained value.

 *

 * Returns: 0 on success or negative error value on failure

 */

extern int led_update_flash_brightness(struct led_classdev_flash *fled_cdev);



/**

 * led_set_flash_timeout - set flash LED timeout

 * @fled_cdev: the flash LED to set

 * @timeout: the flash timeout to set it to

 *

 * Set the flash strobe duration.

 *

 * Returns: 0 on success or negative error value on failure

 */

extern int led_set_flash_timeout(struct led_classdev_flash *fled_cdev,

					u32 timeout);



/**

 * led_get_flash_fault - get the flash LED fault

 * @fled_cdev: the flash LED to query

 * @fault: bitmask containing flash faults

 *

 * Get the flash LED fault.

 *

 * Returns: 0 on success or negative error value on failure

 */

extern int led_get_flash_fault(struct led_classdev_flash *fled_cdev,

					u32 *fault);



#endif	/* __LINUX_FLASH_LEDS_H_INCLUDED */

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