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leds: triggers: send uevent when changing triggers

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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.

Change-Id: I31410cbc0f5c146f31c61326f8006e98b3b7201e
Signed-off-by: Colin Cross <ccross@android.com>
This commit is contained in:
Colin Cross 2012-07-23 18:08:15 -07:00
parent 2d8498643c
commit fa66596a82
1 changed files with 13 additions and 0 deletions
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13
drivers/leds/led-triggers.c
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@ -102,6 +102,12 @@ EXPORT_SYMBOL_GPL(led_trigger_show);
void led_trigger_set(struct led_classdev *led_cdev, struct led_trigger *trigger)
{
unsigned long flags;
char *event = NULL;
char *envp[2];
const char *name;
name = trigger ? trigger->name : "none";
event = kasprintf(GFP_KERNEL, "TRIGGER=%s", name);
/* Remove any existing trigger */
if (led_cdev->trigger) {
@ -122,6 +128,13 @@ void led_trigger_set(struct led_classdev *led_cdev, struct led_trigger *trigger)
if (trigger->activate)
trigger->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);