On Wed, May 09, 2007 at 04:13:14PM +0100, Richard Purdie wrote:
> On Wed, 2007-05-09 at 23:26 +0900, kogiidena wrote:
> > Hi Richard-san
> >
> > The following three points were corrected.
> >
> > 1.
> > > You can't do this since the trigger will appear for all LEDs and it only
> > > applies to a single LED. There has been previous discussion of LED
> > > specific triggers and we'll need that support before you can make
> > > something like this work. Nobody has sent me a patch for that yet and I
> > > haven't had time to write one...
> > The trigger name past "disk" was changed to the name "hard".
> > This is to mean the hardware of LANDISK controls LED.
> > The problem of "LED specific triggers" is solved.
>
> No, its not solved.
>
> Imagine I connect some device with its own LEDs and LED drivers. I'll
> use "corgi:amber" as an example.
>
> I run:
>
> 'cat /sys/class/leds/corgi:amber/triggers'
>
> I see "hard" listed.
>
> 'echo "hard" > /sys/class/leds/corgi:amber/triggers'
>
> doesn't work though...
>
> If its not going to work, it shouldn't be listed.
>
> Regards,
>
> Richard
Following patch sitting for a long time in our handhelds.org tree.
kogiidena, I'm almost sure you'll find it useful, just apply patch,
and implement .is_led_supported function for your trigger, which will
eliminate trigger showing in
/sys/class/leds/LED_WHICH_NOT_SUPPORTS_CUSTOM_TRIGGER/triggers
- - - - -
Custom triggers support, which are might not supported by all LEDs
Signed-off-by: Anton Vorontsov <[email protected]>
diff --git a/drivers/leds/led-triggers.c b/drivers/leds/led-triggers.c
index 454fb09..0af0d61 100644
--- a/drivers/leds/led-triggers.c
+++ b/drivers/leds/led-triggers.c
@@ -53,6 +53,9 @@ ssize_t led_trigger_store(struct class_device *dev, const char *buf,
read_lock(&triggers_list_lock);
list_for_each_entry(trig, &trigger_list, next_trig) {
if (!strcmp(trigger_name, trig->name)) {
+ if (trig->is_led_supported &&
+ !trig->is_led_supported(led_cdev)) break;
+
write_lock(&led_cdev->trigger_lock);
led_trigger_set(led_cdev, trig);
write_unlock(&led_cdev->trigger_lock);
@@ -85,6 +88,8 @@ ssize_t led_trigger_show(struct class_device *dev, char *buf)
if (led_cdev->trigger && !strcmp(led_cdev->trigger->name,
trig->name))
len += sprintf(buf+len, "[%s] ", trig->name);
+ else if (trig->is_led_supported &&
+ !trig->is_led_supported(led_cdev)) continue;
else
len += sprintf(buf+len, "%s ", trig->name);
}
@@ -127,6 +132,7 @@ void led_trigger_set(struct led_classdev *led_cdev, struct led_trigger *trigger)
led_cdev->trigger->deactivate(led_cdev);
led_set_brightness(led_cdev, LED_OFF);
}
+ led_cdev->trigger = trigger;
if (trigger) {
write_lock_irqsave(&trigger->leddev_list_lock, flags);
list_add_tail(&led_cdev->trig_list, &trigger->led_cdevs);
@@ -134,7 +140,6 @@ void led_trigger_set(struct led_classdev *led_cdev, struct led_trigger *trigger)
if (trigger->activate)
trigger->activate(led_cdev);
}
- led_cdev->trigger = trigger;
}
void led_trigger_set_default(struct led_classdev *led_cdev)
@@ -171,7 +176,9 @@ int led_trigger_register(struct led_trigger *trigger)
list_for_each_entry(led_cdev, &leds_list, node) {
write_lock(&led_cdev->trigger_lock);
if (!led_cdev->trigger && led_cdev->default_trigger &&
- !strcmp(led_cdev->default_trigger, trigger->name))
+ !strcmp(led_cdev->default_trigger, trigger->name) &&
+ (!trigger->is_led_supported ||
+ trigger->is_led_supported(led_cdev)))
led_trigger_set(led_cdev, trigger);
write_unlock(&led_cdev->trigger_lock);
}
diff --git a/include/linux/leds.h b/include/linux/leds.h
index 88afcef..71175f6 100644
--- a/include/linux/leds.h
+++ b/include/linux/leds.h
@@ -70,6 +70,7 @@ struct led_trigger {
const char *name;
void (*activate)(struct led_classdev *led_cdev);
void (*deactivate)(struct led_classdev *led_cdev);
+ int (*is_led_supported)(struct led_classdev *led_cdev);
/* LEDs under control by this trigger (for simple triggers) */
rwlock_t leddev_list_lock;
-
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