Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 8e1f4561 authored by Krzysztof Kozlowski's avatar Krzysztof Kozlowski Committed by Jacek Anaszewski
Browse files

leds: Add helper for getting default pattern from Device Tree 



Multiple LED triggers might need to access default pattern so add a
helper for that.

Signed-off-by: default avatarKrzysztof Kozlowski <krzk@kernel.org>
Acked-by: default avatarPavel Machek <pavel@ucw.cz>
Signed-off-by: default avatarJacek Anaszewski <jacek.anaszewski@gmail.com>
parent 1dd70937

drivers/leds/led-core.c

+30 −0
Original line number Diff line number Diff line
@@ -16,7 +16,9 @@ 
#include <linux/list.h>

#include <linux/module.h>

#include <linux/mutex.h>

#include <linux/of.h>

#include <linux/rwsem.h>

#include <linux/slab.h>

#include "leds.h"



DECLARE_RWSEM(leds_list_lock);
@@ -310,6 +312,34 @@ int led_update_brightness(struct led_classdev *led_cdev) 
}

EXPORT_SYMBOL_GPL(led_update_brightness);



u32 *led_get_default_pattern(struct led_classdev *led_cdev, unsigned int *size)

{

	struct device_node *np = dev_of_node(led_cdev->dev);

	u32 *pattern;

	int count;



	if (!np)

		return NULL;



	count = of_property_count_u32_elems(np, "led-pattern");

	if (count < 0)

		return NULL;



	pattern = kcalloc(count, sizeof(*pattern), GFP_KERNEL);

	if (!pattern)

		return NULL;



	if (of_property_read_u32_array(np, "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)

{

include/linux/leds.h

+13 −0
Original line number Diff line number Diff line
@@ -218,6 +218,19 @@ extern int led_set_brightness_sync(struct led_classdev *led_cdev, 
 */

extern int led_update_brightness(struct led_classdev *led_cdev);



/**

 * led_get_default_pattern - return default pattern

 *

 * @led_cdev: the LED to get default pattern for

 * @size:     pointer for storing the number of elements in returned array,

 *            modified only if return != NULL

 *

 * Return:    Allocated array of integers with default pattern from device tree

 *            or NULL.  Caller is responsible for kfree().

 */

extern u32 *led_get_default_pattern(struct led_classdev *led_cdev,

				    unsigned int *size);



/**

 * led_sysfs_disable - disable LED sysfs interface

 * @led_cdev: the LED to set