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authorColin Cross <ccross@android.com>2012-08-27 03:31:49 +0200
committerBryan Wu <bryan.wu@canonical.com>2012-09-11 12:32:41 +0200
commit52c47742f79d9240f90af9a6722fe8bb3fa8c0f9 (patch)
tree057217b5690f6db9421080a7aa039a2fe4899463 /drivers/leds
parentleds-lp5523: minor code style fixes (diff)
downloadlinux-52c47742f79d9240f90af9a6722fe8bb3fa8c0f9.tar.xz
linux-52c47742f79d9240f90af9a6722fe8bb3fa8c0f9.zip
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.c13
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/leds/led-triggers.c b/drivers/leds/led-triggers.c
index b53bf54023f6..262eb4193710 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);