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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.

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>
This commit is contained in:
Colin Cross 2012-08-27 09:31:49 +08:00 committed by Bryan Wu
parent 469eba0230
commit 52c47742f7
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 *trig) void led_trigger_set(struct led_classdev *led_cdev, struct led_trigger *trig)
{ {
unsigned long flags; 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 */ /* Remove any existing trigger */
if (led_cdev->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) if (trig->activate)
trig->activate(led_cdev); 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); EXPORT_SYMBOL_GPL(led_trigger_set);