drivers/leds/led-core.c - third_party/linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-only
 /*
  * LED Class Core
  *
  * Copyright 2005-2006 Openedhand Ltd.
  *
  * Author: Richard Purdie <rpurdie@openedhand.com>
  */

 #include <linux/kernel.h>
 #include <linux/leds.h>
 #include <linux/list.h>
 #include <linux/module.h>
 #include <linux/mutex.h>
 #include <linux/of.h>
 #include <linux/property.h>
 #include <linux/rwsem.h>
 #include <linux/slab.h>
 #include <uapi/linux/uleds.h>
 #include "leds.h"

 DECLARE_RWSEM(leds_list_lock);
 EXPORT_SYMBOL_GPL(leds_list_lock);

 LIST_HEAD(leds_list);
 EXPORT_SYMBOL_GPL(leds_list);

 const char * const led_colors[LED_COLOR_ID_MAX] = {
 	[LED_COLOR_ID_WHITE] = "white",
 	[LED_COLOR_ID_RED] = "red",
 	[LED_COLOR_ID_GREEN] = "green",
 	[LED_COLOR_ID_BLUE] = "blue",
 	[LED_COLOR_ID_AMBER] = "amber",
 	[LED_COLOR_ID_VIOLET] = "violet",
 	[LED_COLOR_ID_YELLOW] = "yellow",
 	[LED_COLOR_ID_IR] = "ir",
 };
 EXPORT_SYMBOL_GPL(led_colors);

 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(struct timer_list *t)
 {
 	struct led_classdev *led_cdev = from_timer(led_cdev, t, blink_timer);
 	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);
 		clear_bit(LED_BLINK_SW, &led_cdev->work_flags);
 		return;
 	}

 	if (test_and_clear_bit(LED_BLINK_ONESHOT_STOP,
 			       &led_cdev->work_flags)) {
 		clear_bit(LED_BLINK_SW, &led_cdev->work_flags);
 		return;
 	}

 	brightness = led_get_brightness(led_cdev);
 	if (!brightness) {
 		/* Time to switch the LED on. */
 		if (test_and_clear_bit(LED_BLINK_BRIGHTNESS_CHANGE,
 					&led_cdev->work_flags))
 			brightness = led_cdev->new_blink_brightness;
 		else
 			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.
 		 */
 		led_cdev->blink_brightness = brightness;
 		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 (test_bit(LED_BLINK_ONESHOT, &led_cdev->work_flags)) {
 		if (test_bit(LED_BLINK_INVERT, &led_cdev->work_flags)) {
 			if (brightness)
 				set_bit(LED_BLINK_ONESHOT_STOP,
 					&led_cdev->work_flags);
 		} else {
 			if (!brightness)
 				set_bit(LED_BLINK_ONESHOT_STOP,
 					&led_cdev->work_flags);
 		}
 	}

 	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 (test_and_clear_bit(LED_BLINK_DISABLE, &led_cdev->work_flags)) {
 		led_cdev->delayed_set_value = LED_OFF;
 		led_stop_software_blink(led_cdev);
 	}

 	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;
 	}

 	set_bit(LED_BLINK_SW, &led_cdev->work_flags);
 	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 (!test_bit(LED_BLINK_ONESHOT, &led_cdev->work_flags) &&
 	    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);

 	timer_setup(&led_cdev->blink_timer, led_timer_function, 0);
 }
 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);

 	clear_bit(LED_BLINK_SW, &led_cdev->work_flags);
 	clear_bit(LED_BLINK_ONESHOT, &led_cdev->work_flags);
 	clear_bit(LED_BLINK_ONESHOT_STOP, &led_cdev->work_flags);

 	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 (test_bit(LED_BLINK_ONESHOT, &led_cdev->work_flags) &&
 	     timer_pending(&led_cdev->blink_timer))
 		return;

 	set_bit(LED_BLINK_ONESHOT, &led_cdev->work_flags);
 	clear_bit(LED_BLINK_ONESHOT_STOP, &led_cdev->work_flags);

 	if (invert)
 		set_bit(LED_BLINK_INVERT, &led_cdev->work_flags);
 	else
 		clear_bit(LED_BLINK_INVERT, &led_cdev->work_flags);

 	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;
 	clear_bit(LED_BLINK_SW, &led_cdev->work_flags);
 }
 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 (test_bit(LED_BLINK_SW, &led_cdev->work_flags)) {
 		/*
 		 * 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) {
 			set_bit(LED_BLINK_DISABLE, &led_cdev->work_flags);
 			schedule_work(&led_cdev->set_brightness_work);
 		} else {
 			set_bit(LED_BLINK_BRIGHTNESS_CHANGE,
 				&led_cdev->work_flags);
 			led_cdev->new_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);

 u32 *led_get_default_pattern(struct led_classdev *led_cdev, unsigned int *size)
 {
 	struct fwnode_handle *fwnode = led_cdev->dev->fwnode;
 	u32 *pattern;
 	int count;

 	count = fwnode_property_count_u32(fwnode, "led-pattern");
 	if (count < 0)
 		return NULL;

 	pattern = kcalloc(count, sizeof(*pattern), GFP_KERNEL);
 	if (!pattern)
 		return NULL;

 	if (fwnode_property_read_u32_array(fwnode, "led-pattern", pattern, count)) {
 		kfree(pattern);
 		return NULL;
 	}

 	*size = count;

 	return pattern;
 }
 EXPORT_SYMBOL_GPL(led_get_default_pattern);

 /* 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);

 static void led_parse_fwnode_props(struct device *dev,
 				   struct fwnode_handle *fwnode,
 				   struct led_properties *props)
 {
 	int ret;

 	if (!fwnode)
 		return;

 	if (fwnode_property_present(fwnode, "label")) {
 		ret = fwnode_property_read_string(fwnode, "label", &props->label);
 		if (ret)
 			dev_err(dev, "Error parsing 'label' property (%d)\n", ret);
 		return;
 	}

 	if (fwnode_property_present(fwnode, "color")) {
 		ret = fwnode_property_read_u32(fwnode, "color", &props->color);
 		if (ret)
 			dev_err(dev, "Error parsing 'color' property (%d)\n", ret);
 		else if (props->color >= LED_COLOR_ID_MAX)
 			dev_err(dev, "LED color identifier out of range\n");
 		else
 			props->color_present = true;
 	}


 	if (!fwnode_property_present(fwnode, "function"))
 		return;

 	ret = fwnode_property_read_string(fwnode, "function", &props->function);
 	if (ret) {
 		dev_err(dev,
 			"Error parsing 'function' property (%d)\n",
 			ret);
 	}

 	if (!fwnode_property_present(fwnode, "function-enumerator"))
 		return;

 	ret = fwnode_property_read_u32(fwnode, "function-enumerator",
 				       &props->func_enum);
 	if (ret) {
 		dev_err(dev,
 			"Error parsing 'function-enumerator' property (%d)\n",
 			ret);
 	} else {
 		props->func_enum_present = true;
 	}
 }

 int led_compose_name(struct device *dev, struct led_init_data *init_data,
 		     char *led_classdev_name)
 {
 	struct led_properties props = {};
 	struct fwnode_handle *fwnode = init_data->fwnode;
 	const char *devicename = init_data->devicename;

 	if (!led_classdev_name)
 		return -EINVAL;

 	led_parse_fwnode_props(dev, fwnode, &props);

 	if (props.label) {
 		/*
 		 * If init_data.devicename is NULL, then it indicates that
 		 * DT label should be used as-is for LED class device name.
 		 * Otherwise the label is prepended with devicename to compose
 		 * the final LED class device name.
 		 */
 		if (!devicename) {
 			strscpy(led_classdev_name, props.label,
 				LED_MAX_NAME_SIZE);
 		} else {
 			snprintf(led_classdev_name, LED_MAX_NAME_SIZE, "%s:%s",
 				 devicename, props.label);
 		}
 	} else if (props.function || props.color_present) {
 		char tmp_buf[LED_MAX_NAME_SIZE];

 		if (props.func_enum_present) {
 			snprintf(tmp_buf, LED_MAX_NAME_SIZE, "%s:%s-%d",
 				 props.color_present ? led_colors[props.color] : "",
 				 props.function ?: "", props.func_enum);
 		} else {
 			snprintf(tmp_buf, LED_MAX_NAME_SIZE, "%s:%s",
 				 props.color_present ? led_colors[props.color] : "",
 				 props.function ?: "");
 		}
 		if (init_data->devname_mandatory) {
 			snprintf(led_classdev_name, LED_MAX_NAME_SIZE, "%s:%s",
 				 devicename, tmp_buf);
 		} else {
 			strscpy(led_classdev_name, tmp_buf, LED_MAX_NAME_SIZE);

 		}
 	} else if (init_data->default_label) {
 		if (!devicename) {
 			dev_err(dev, "Legacy LED naming requires devicename segment");
 			return -EINVAL;
 		}
 		snprintf(led_classdev_name, LED_MAX_NAME_SIZE, "%s:%s",
 			 devicename, init_data->default_label);
 	} else if (is_of_node(fwnode)) {
 		strscpy(led_classdev_name, to_of_node(fwnode)->name,
 			LED_MAX_NAME_SIZE);
 	} else
 		return -EINVAL;

 	return 0;
 }
 EXPORT_SYMBOL_GPL(led_compose_name);
	// SPDX-License-Identifier: GPL-2.0-only
	/*
	* LED Class Core
	*
	* Copyright 2005-2006 Openedhand Ltd.
	*
	* Author: Richard Purdie <rpurdie@openedhand.com>
	*/

	#include <linux/kernel.h>
	#include <linux/leds.h>
	#include <linux/list.h>
	#include <linux/module.h>
	#include <linux/mutex.h>
	#include <linux/of.h>
	#include <linux/property.h>
	#include <linux/rwsem.h>
	#include <linux/slab.h>
	#include <uapi/linux/uleds.h>
	#include "leds.h"

	DECLARE_RWSEM(leds_list_lock);
	EXPORT_SYMBOL_GPL(leds_list_lock);

	LIST_HEAD(leds_list);
	EXPORT_SYMBOL_GPL(leds_list);

	const char * const led_colors[LED_COLOR_ID_MAX] = {
	[LED_COLOR_ID_WHITE] = "white",
	[LED_COLOR_ID_RED] = "red",
	[LED_COLOR_ID_GREEN] = "green",
	[LED_COLOR_ID_BLUE] = "blue",
	[LED_COLOR_ID_AMBER] = "amber",
	[LED_COLOR_ID_VIOLET] = "violet",
	[LED_COLOR_ID_YELLOW] = "yellow",
	[LED_COLOR_ID_IR] = "ir",
	};
	EXPORT_SYMBOL_GPL(led_colors);

	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(struct timer_list *t)
	{
	struct led_classdev *led_cdev = from_timer(led_cdev, t, blink_timer);
	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);
	clear_bit(LED_BLINK_SW, &led_cdev->work_flags);
	return;
	}

	if (test_and_clear_bit(LED_BLINK_ONESHOT_STOP,
	&led_cdev->work_flags)) {
	clear_bit(LED_BLINK_SW, &led_cdev->work_flags);
	return;
	}

	brightness = led_get_brightness(led_cdev);
	if (!brightness) {
	/* Time to switch the LED on. */
	if (test_and_clear_bit(LED_BLINK_BRIGHTNESS_CHANGE,
	&led_cdev->work_flags))
	brightness = led_cdev->new_blink_brightness;
	else
	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.
	*/
	led_cdev->blink_brightness = brightness;
	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 (test_bit(LED_BLINK_ONESHOT, &led_cdev->work_flags)) {
	if (test_bit(LED_BLINK_INVERT, &led_cdev->work_flags)) {
	if (brightness)
	set_bit(LED_BLINK_ONESHOT_STOP,
	&led_cdev->work_flags);
	} else {
	if (!brightness)
	set_bit(LED_BLINK_ONESHOT_STOP,
	&led_cdev->work_flags);
	}
	}

	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 (test_and_clear_bit(LED_BLINK_DISABLE, &led_cdev->work_flags)) {
	led_cdev->delayed_set_value = LED_OFF;
	led_stop_software_blink(led_cdev);
	}

	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;
	}

	set_bit(LED_BLINK_SW, &led_cdev->work_flags);
	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 (!test_bit(LED_BLINK_ONESHOT, &led_cdev->work_flags) &&
	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);

	timer_setup(&led_cdev->blink_timer, led_timer_function, 0);
	}
	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);

	clear_bit(LED_BLINK_SW, &led_cdev->work_flags);
	clear_bit(LED_BLINK_ONESHOT, &led_cdev->work_flags);
	clear_bit(LED_BLINK_ONESHOT_STOP, &led_cdev->work_flags);

	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 (test_bit(LED_BLINK_ONESHOT, &led_cdev->work_flags) &&
	timer_pending(&led_cdev->blink_timer))
	return;

	set_bit(LED_BLINK_ONESHOT, &led_cdev->work_flags);
	clear_bit(LED_BLINK_ONESHOT_STOP, &led_cdev->work_flags);

	if (invert)
	set_bit(LED_BLINK_INVERT, &led_cdev->work_flags);
	else
	clear_bit(LED_BLINK_INVERT, &led_cdev->work_flags);

	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;
	clear_bit(LED_BLINK_SW, &led_cdev->work_flags);
	}
	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 (test_bit(LED_BLINK_SW, &led_cdev->work_flags)) {
	/*
	* 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) {
	set_bit(LED_BLINK_DISABLE, &led_cdev->work_flags);
	schedule_work(&led_cdev->set_brightness_work);
	} else {
	set_bit(LED_BLINK_BRIGHTNESS_CHANGE,
	&led_cdev->work_flags);
	led_cdev->new_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);

	u32 led_get_default_pattern(struct led_classdev led_cdev, unsigned int *size)
	{
	struct fwnode_handle *fwnode = led_cdev->dev->fwnode;
	u32 *pattern;
	int count;

	count = fwnode_property_count_u32(fwnode, "led-pattern");
	if (count < 0)
	return NULL;

	pattern = kcalloc(count, sizeof(*pattern), GFP_KERNEL);
	if (!pattern)
	return NULL;

	if (fwnode_property_read_u32_array(fwnode, "led-pattern", pattern, count)) {
	kfree(pattern);
	return NULL;
	}

	*size = count;

	return pattern;
	}
	EXPORT_SYMBOL_GPL(led_get_default_pattern);

	/* 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);

	static void led_parse_fwnode_props(struct device *dev,
	struct fwnode_handle *fwnode,
	struct led_properties *props)
	{
	int ret;

	if (!fwnode)
	return;

	if (fwnode_property_present(fwnode, "label")) {
	ret = fwnode_property_read_string(fwnode, "label", &props->label);
	if (ret)
	dev_err(dev, "Error parsing 'label' property (%d)\n", ret);
	return;
	}

	if (fwnode_property_present(fwnode, "color")) {
	ret = fwnode_property_read_u32(fwnode, "color", &props->color);
	if (ret)
	dev_err(dev, "Error parsing 'color' property (%d)\n", ret);
	else if (props->color >= LED_COLOR_ID_MAX)
	dev_err(dev, "LED color identifier out of range\n");
	else
	props->color_present = true;
	}


	if (!fwnode_property_present(fwnode, "function"))
	return;

	ret = fwnode_property_read_string(fwnode, "function", &props->function);
	if (ret) {
	dev_err(dev,
	"Error parsing 'function' property (%d)\n",
	ret);
	}

	if (!fwnode_property_present(fwnode, "function-enumerator"))
	return;

	ret = fwnode_property_read_u32(fwnode, "function-enumerator",
	&props->func_enum);
	if (ret) {
	dev_err(dev,
	"Error parsing 'function-enumerator' property (%d)\n",
	ret);
	} else {
	props->func_enum_present = true;
	}
	}

	int led_compose_name(struct device dev, struct led_init_data init_data,
	char *led_classdev_name)
	{
	struct led_properties props = {};
	struct fwnode_handle *fwnode = init_data->fwnode;
	const char *devicename = init_data->devicename;

	if (!led_classdev_name)
	return -EINVAL;

	led_parse_fwnode_props(dev, fwnode, &props);

	if (props.label) {
	/*
	* If init_data.devicename is NULL, then it indicates that
	* DT label should be used as-is for LED class device name.
	* Otherwise the label is prepended with devicename to compose
	* the final LED class device name.
	*/
	if (!devicename) {
	strscpy(led_classdev_name, props.label,
	LED_MAX_NAME_SIZE);
	} else {
	snprintf(led_classdev_name, LED_MAX_NAME_SIZE, "%s:%s",
	devicename, props.label);
	}
	} else if (props.function \|\| props.color_present) {
	char tmp_buf[LED_MAX_NAME_SIZE];

	if (props.func_enum_present) {
	snprintf(tmp_buf, LED_MAX_NAME_SIZE, "%s:%s-%d",
	props.color_present ? led_colors[props.color] : "",
	props.function ?: "", props.func_enum);
	} else {
	snprintf(tmp_buf, LED_MAX_NAME_SIZE, "%s:%s",
	props.color_present ? led_colors[props.color] : "",
	props.function ?: "");
	}
	if (init_data->devname_mandatory) {
	snprintf(led_classdev_name, LED_MAX_NAME_SIZE, "%s:%s",
	devicename, tmp_buf);
	} else {
	strscpy(led_classdev_name, tmp_buf, LED_MAX_NAME_SIZE);

	}
	} else if (init_data->default_label) {
	if (!devicename) {
	dev_err(dev, "Legacy LED naming requires devicename segment");
	return -EINVAL;
	}
	snprintf(led_classdev_name, LED_MAX_NAME_SIZE, "%s:%s",
	devicename, init_data->default_label);
	} else if (is_of_node(fwnode)) {
	strscpy(led_classdev_name, to_of_node(fwnode)->name,
	LED_MAX_NAME_SIZE);
	} else
	return -EINVAL;

	return 0;
	}
	EXPORT_SYMBOL_GPL(led_compose_name);