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

Commit 0f85e849 authored by Krzysztof Kozlowski's avatar Krzysztof Kozlowski Committed by Jacek Anaszewski
Browse files

leds: trigger: timer: Add initialization from Device Tree 



Allow initialization of delays used in timer trigger from Device
Tree property.

This is especially useful for embedded systems where the trigger might
be used early, before bringing up user-space.

Signed-off-by: default avatarKrzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: default avatarJacek Anaszewski <jacek.anaszewski@gmail.com>
parent 9c9ab51e

drivers/leds/trigger/ledtrig-timer.c

+34 −0
Original line number Diff line number Diff line
@@ -15,6 +15,7 @@ 
#include <linux/init.h>

#include <linux/device.h>

#include <linux/ctype.h>

#include <linux/slab.h>

#include <linux/leds.h>



static ssize_t led_delay_on_show(struct device *dev,
@@ -77,8 +78,41 @@ static struct attribute *timer_trig_attrs[] = { 
};

ATTRIBUTE_GROUPS(timer_trig);



static void pattern_init(struct led_classdev *led_cdev)

{

	u32 *pattern;

	unsigned int size = 0;



	pattern = led_get_default_pattern(led_cdev, &size);

	if (!pattern)

		return;



	if (size != 2) {

		dev_warn(led_cdev->dev,

			 "Expected 2 but got %u values for delays pattern\n",

			 size);

		goto out;

	}



	led_cdev->blink_delay_on = pattern[0];

	led_cdev->blink_delay_off = pattern[1];

	/* led_blink_set() called by caller */



out:

	kfree(pattern);

}



static int timer_trig_activate(struct led_classdev *led_cdev)

{

	if (led_cdev->flags & LED_INIT_DEFAULT_TRIGGER) {

		pattern_init(led_cdev);

		/*

		 * Mark as initialized even on pattern_init() error because

		 * any consecutive call to it would produce the same error.

		 */

		led_cdev->flags &= ~LED_INIT_DEFAULT_TRIGGER;

	}



	led_blink_set(led_cdev, &led_cdev->blink_delay_on,

		      &led_cdev->blink_delay_off);