Commit 41906632 authored by Eddie James's avatar Eddie James Committed by Pavel Machek
Browse files

leds: leds-core: Implement the retain-state-shutdown property 



Read the retain-state-shutdown device tree property to set the
existing LED_RETAIN_AT_SHUTDOWN flag. Then check the flag when
unregistering, and if set, don't set the brightness to OFF. This
is useful for systems that want to keep the HW state of the LED
across reboots.

Signed-off-by: default avatarEddie James <eajames@linux.ibm.com>
Signed-off-by: default avatarPavel Machek <pavel@ucw.cz>
parent 5d823d6d

drivers/leds/led-class.c

+8 −2
Original line number Diff line number Diff line
@@ -350,10 +350,15 @@ int led_classdev_register_ext(struct device *parent, 
		if (ret < 0)

			return ret;



		if (init_data->fwnode)

		if (init_data->fwnode) {

			fwnode_property_read_string(init_data->fwnode,

				"linux,default-trigger",

				&led_cdev->default_trigger);



			if (fwnode_property_present(init_data->fwnode,

						    "retain-state-shutdown"))

				led_cdev->flags |= LED_RETAIN_AT_SHUTDOWN;

		}

	} else {

		proposed_name = led_cdev->name;

	}
@@ -444,6 +449,7 @@ void led_classdev_unregister(struct led_classdev *led_cdev) 
	/* Stop blinking */

	led_stop_software_blink(led_cdev);



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

		led_set_brightness(led_cdev, LED_OFF);



	flush_work(&led_cdev->set_brightness_work);