Commit 52c47742 authored Aug 27, 2012 by Colin Cross Committed by Bryan Wu Sep 11, 2012

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: Colin Cross <ccross@android.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Signed-off-by: Bryan 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);

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