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leds: Add helper for getting default pattern from Device Tree

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

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>
This commit is contained in:
Krzysztof Kozlowski 2019-01-09 15:44:46 +01:00 committed by Jacek Anaszewski
parent 1dd7093742
commit 8e1f456129
2 changed files with 43 additions and 0 deletions
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30
drivers/leds/led-core.c
View File

@ -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)
{

13
include/linux/leds.h
View File

@ -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