linux-kernel - Re: [PATCH] Input: document the proper usage of EV_KEY and KEY

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Message-ID: <20070531233326.GA1947@srcf.ucam.org>
Date:	Fri, 1 Jun 2007 00:33:27 +0100
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	Henrique de Moraes Holschuh <hmh@....eng.br>
Cc:	Dmitry Torokhov <dtor@...ightbb.com>,
	Richard Hughes <hughsient@...il.com>,
	linux-acpi@...r.kernel.org, linux-input@...ey.karlin.mff.cuni.cz,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Input: document the proper usage of EV_KEY and KEY_UNKNOWN

On Thu, May 31, 2007 at 07:28:14PM -0300, Henrique de Moraes Holschuh wrote:
> We have all the pieces needed to have sane, generic userland keyboard handling
> in place for a while now, but it was not sufficiently documented (or used!).
> 
> If EV_KEY input drivers always generate scan codes that can be used to
> reprogram their keycode maps, and always generate EV_MSC MSC_SCAN events when
> they output an EV_KEY KEY_UNKNOWN event, userspace can trap those and feed it
> to a generic helper that can ask the user to assign a key code and function to
> that key.

I still disagree that this is the best approach. Userspace already has 
the functionality to map keys if they produce a keycode. Producing 
KEY_UNKNOWN would require the implementation of a stack of extra code.

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