linux-kernel - Re: [PATCH] Map volume and brightness events on thinkpads

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Message-ID: <20071016142121.GA21431@srcf.ucam.org>
Date:	Tue, 16 Oct 2007 15:21:21 +0100
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	Henrique de Moraes Holschuh <hmh@....eng.br>
Cc:	Jeremy Katz <katzj@...hat.com>, linux-kernel@...r.kernel.org,
	torvalds@...ux-foundation.org, davej@...hat.com,
	Dmitry Torokhov <dmitry.torokhov@...il.com>
Subject: Re: [PATCH] Map volume and brightness events on thinkpads

On Tue, Oct 16, 2007 at 12:11:53PM -0200, Henrique de Moraes Holschuh wrote:
> On Tue, 16 Oct 2007, Matthew Garrett wrote:
> > are sent via the keyboard controller, such as the wireless and touchpad 
> > disable keys on my HP. There are Dells that do the same for brightness 
> 
> It is not clear to me if they are notifications or not.  Does the firmware
> act on the keys by itself? If it does, then they are notifications.  If it
> does not, then they are regular hot keys and there is no controversy whether
> they belong on the input layer or not (they do).

Yes, the firmware acts upon it.

> 2. I am against sending notification events through input **that look
> exactly the same as regular events**.  That is not a wise design choice IMO,
> it is a very dirty hack.

Userspace is going to have to deal with this case anyway. Some vendors 
simply don't let us distinguish.

> 3. We have a backlight class, a LED class, a rf-kill class and ALSA mixers.
> Is there a real reason to pester Dmitry about the issue, if we can use these
> alternate paths (that are indeed more generic and more suited for the job)?

It's not always going to be possible to tie notifications into a class 
device - in the Dell case, for instance, interacting with the backlight 
requires you to use a 200Kb library so has to be done in userspace.

-- 
Matthew Garrett | mjg59@...f.ucam.org
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