diff options
| author | Colin Cross <ccross@android.com> | 2012-08-27 09:31:49 +0800 |
|---|---|---|
| committer | Bryan Wu <bryan.wu@canonical.com> | 2012-09-11 18:32:41 +0800 |
| commit | 52c47742f79d9240f90af9a6722fe8bb3fa8c0f9 (patch) | |
| tree | 057217b5690f6db9421080a7aa039a2fe4899463 /drivers/leds | |
| parent | 469eba023087d8fa3974827e6bedf874a620d0e7 (diff) | |
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>
Diffstat (limited to 'drivers/leds')
| -rw-r--r-- | drivers/leds/led-triggers.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/leds/led-triggers.c b/drivers/leds/led-triggers.c index b53bf54023f..262eb419371 100644 --- a/drivers/leds/led-triggers.c +++ b/drivers/leds/led-triggers.c @@ -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); |