linux-kernel - Re: [PATCH] leds: lp5523: add master

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Message-ID: <20150622115846.GA9179@xo-6d-61-c0.localdomain>
Date:	Mon, 22 Jun 2015 13:58:46 +0200
From:	Pavel Machek <pavel@....cz>
To:	Bryan Wu <cooloney@...il.com>
Cc:	Jacek Anaszewski <j.anaszewski@...sung.com>,
	"Kim, Milo" <milo.kim@...com>, Toshi Kikuchi <toshik@...omium.org>,
	lkml <linux-kernel@...r.kernel.org>,
	Linux LED Subsystem <linux-leds@...r.kernel.org>
Subject: Re: [PATCH] leds: lp5523: add master_fader support

Hi!

> >>>> This patch introduces 4 new attributes:
> >>>>     master_fader_leds
> >>>>     master_fader1
> >>>>     master_fader2
> >>>>     master_fader3
> >>>>
> >>>> Fo example, to map channel 0,6 to master_fader1,
> >>>> map channel 1,7 to master_fader2,
> >>>> map channel 2,8 to master_fader3, and
> >>>> map channel 3,4,5 to none
> >>>
> >>>   >
> >>>>
> >>>>     echo "123000123" > master_fader_leds
> >>>
> >>>
> >>> I propose to add ABI documentation for this driver. It already exposes
> >>> many custom attributes but I can't find documentation for them.
> >>
> >>
> >> I agree with Jacek's comment but it would be better if we could see the
> >> description in lp5523 driver
> >> documentation(Documentation/leds/leds-lp5523.txt).
> >
> >
> > Right, I missed that file.
> >
> >
> 
> Toshi,
> 
> I merged this patch into my tree with Milo and Jacek Acks. But please
> follow their advice and provide a patch to update those document
> files.

Are you sure this is the right interface? lp5523 is turing-complete. Yes, it
can multiply brightness values by a constant. It can also do morse code on its
own, and compute prime numbers.

Why is this useful addition to kernel<->user interface?

Can we do better interface that works on more than one chip?
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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