linux-kernel - Re: [PATCH RFC] leds: Add support for per-LED device triggers

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Message-ID: <20200704200720.GA24405@amd>
Date:   Sat, 4 Jul 2020 22:07:20 +0200
From:   Pavel Machek <pavel@....cz>
To:     Ondřej Jirman <megous@...ous.com>,
        linux-kernel@...r.kernel.org,
        Jacek Anaszewski <jacek.anaszewski@...il.com>,
        Dan Murphy <dmurphy@...com>,
        "open list:LED SUBSYSTEM" <linux-leds@...r.kernel.org>
Subject: Re: [PATCH RFC] leds: Add support for per-LED device triggers

Hi!

> > > Add support for registering per-LED device trigger.
> > > 
> > > Names of private triggers need to be globally unique, but may clash
> > > with other private triggers. This is enforced during trigger
> > 
> > Globally unique name is going to be a problem, no? If you have two
> > keyboards with automatical backlight support...
> 
> Only globally unique in a sense that they must not clash with non
> per-LED trigger names. So you can have two keyboards with 'self-working'
> trigger on their LED devices in sysfs.
> 
> This requirement only comes from the fact that this shares the
> same sysfs configuration interface as regular non-private triggers.

Ok. That looks sane.

And if you tweak code a bit (don't compare pointers to struct led;
have struct hw_trigger_group, and compare pointers to that), you
should be able to fix the uglyness Marek mentioned without major changes.

Best regards,
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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