linux-kernel - Re: [PATCH] eeepc-wmi: set the touchpad toggle key code to F21

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Date:	Fri, 25 Feb 2011 01:33:32 -0800
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Keng-Yü Lin <keng-yu.lin@...onical.com>
Cc:	Martin Pitt <martin.pitt@...onical.com>,
	Corentin Chary <corentin.chary@...il.com>,
	Matthew Garrett <mjg@...hat.com>,
	acpi4asus-user@...ts.sourceforge.net,
	platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org,
	tyson.chen@...onical.com
Subject: Re: [PATCH] eeepc-wmi: set the touchpad toggle key code to F21

On Fri, Feb 25, 2011 at 05:22:43PM +0800, Keng-Yü Lin wrote:
> On Fri, Feb 25, 2011 at 3:18 PM, Dmitry Torokhov
> <dmitry.torokhov@...il.com> wrote:
> > I believe that the kernel should use KEY_TOUCHPAD_TOGGLE and userspace
> > should use udev's key re-mapping facilities while X is unable to process
> > keycodes above 255 to adjust to the keycode du jour. If all kernel
> > drivers were to use KEY_TOUCHPAD_TOGGLE then remapping would be much
> > easier (the utility would simply check capabilities for
> > KEY_TOUCHPAD_TOGGLE and do the remap).
> 
> Can udev re-map a key code to another?

Not directly.

> 
> Am I correct that udev can only re-map a scan code to a specified key code.

Right, so once you determined via capabilities that device emits
KEY_TOUCHPAD_TOGGLE you query the keymap (using EVIOCGKEYCODE2; by
index) and replace all entries that are mapped to KEY_TOUCHPAD_TOGGLE to
whatever you want.

Thanks.

-- 
Dmitry
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