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

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Message-ID: <20200713071255.GB30654@amd>
Date:   Mon, 13 Jul 2020 09:12:55 +0200
From:   Pavel Machek <pavel@....cz>
To:     Marek Behun <marek.behun@....cz>
Cc:     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

On Mon 2020-07-13 01:18:41, Marek Behun wrote:
> On Mon, 13 Jul 2020 01:15:44 +0200
> Marek Behun <marek.behun@....cz> wrote:
> 
> > On Mon, 13 Jul 2020 00:38:21 +0200
> > Ondřej Jirman <megous@...ous.com> wrote:
> > 
> > > So after trying to use this, this seems to disallow the use of multiple HW
> > > triggers per LED. That's fine by me, because using one HW sysfs configured
> > > trigger per LED that use case is my proposal, but is it desireable in general?  
> > 
> > Why? If you register one LED and several triggers, all sharing the same
> > trigger_type pointer, I think it should work.
> > 
> > Marek
> 
> The problem arises when I have two LEDs and two HW triggers, and the
> hardware allows setting one HW trigger on both LEDs and other HW
> trigger only on one LED. But this could simply be ignored - the
> set_trigger function could simply return -ENOTSUPP or something.

In this case you should have two trigger_type pointers (since two LEDs
are different), and yes, you'll have duplication for one of the
triggers. I don't think thats a problem.

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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