Re: [PATCH -next 2/2] leds: add /sys/class/leds/<led>/current-trigger
From: Pavel Machek
Date: Wed Oct 02 2019 - 14:06:29 EST
Hi!
> >>>diff --git a/Documentation/ABI/testing/sysfs-class-led
> >>>b/Documentation/ABI/testing/sysfs-class-led
> >>>index 5f67f7a..fdfed3f 100644
> >>>--- a/Documentation/ABI/testing/sysfs-class-led
> >>>+++ b/Documentation/ABI/testing/sysfs-class-led
> >>>@@ -61,3 +61,16 @@ Description:
> >>> gpio and backlight triggers. In case of the backlight trigger,
> >>> it is useful when driving a LED which is intended to indicate
> >>> a device in a standby like state.
> >>>+
> >>>+What: /sys/class/leds/<led>/current-trigger
> >>>+Date: September 2019
> >>>+KernelVersion: 5.5
> >>>+Contact: linux-leds@xxxxxxxxxxxxxxx
> >>>+Description:
> >>>+ Set the trigger for this LED. A trigger is a kernel based source
> >>>+ of LED events.
> >>>+ Writing the trigger name to this file will change the current
> >>>+ trigger. Trigger specific parameters can appear in
> >>>+ /sys/class/leds/<led> once a given trigger is selected. For
> >>>+ their documentation see sysfs-class-led-trigger-*.
> >>>+ Reading this file will return the current LED trigger name.
> >>Why do we need this new file can't we just update the current trigger
> >>file implementation?
> >We can't change existing ABI. It doesn't matter if it is documented
> >or not - it's in place for very long time and you can't guarantee there
> >are no users relying on triggers file show format.
>
> So if it has been in place for a very long time why do we need another ABI
> that does sorta the same thing?
>
> This seems to be a bit confusing and extra.
Agreed. Lets simply keep the existing ABI.
Thanks,
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
Attachment:
signature.asc
Description: Digital signature