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Commit 52c47742 authored by Colin Cross's avatar Colin Cross Committed by Bryan Wu
Browse files

leds: triggers: send uevent when changing triggers 



Some triggers create sysfs files when they are enabled. Send a uevent
"change" notification whenever the trigger is changed to allow userspace
processes such as udev to modify permissions on the new files.

A change notification will also be sent during registration of led class
devices or led triggers if the default trigger of an led class device
is found.

(bryan.wu@canonical.com: rename trigger to trig to fix the build error)

Signed-off-by: default avatarColin Cross <ccross@android.com>
Acked-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: default avatarHenrique de Moraes Holschuh <hmh@hmh.eng.br>
Signed-off-by: default avatarBryan Wu <bryan.wu@canonical.com>
parent 469eba02

drivers/leds/led-triggers.c

+13 −0
Original line number Diff line number Diff line
@@ -102,6 +102,12 @@ EXPORT_SYMBOL_GPL(led_trigger_show); 
void led_trigger_set(struct led_classdev *led_cdev, struct led_trigger *trig)

{

	unsigned long flags;

	char *event = NULL;

	char *envp[2];

	const char *name;



	name = trig ? trig->name : "none";

	event = kasprintf(GFP_KERNEL, "TRIGGER=%s", name);



	/* Remove any existing trigger */

	if (led_cdev->trigger) {
@@ -124,6 +130,13 @@ void led_trigger_set(struct led_classdev *led_cdev, struct led_trigger *trig) 
		if (trig->activate)

			trig->activate(led_cdev);

	}



	if (event) {

		envp[0] = event;

		envp[1] = NULL;

		kobject_uevent_env(&led_cdev->dev->kobj, KOBJ_CHANGE, envp);

		kfree(event);

	}

}

EXPORT_SYMBOL_GPL(led_trigger_set);