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Date: Fri, 25 Feb 2011 01:33:32 -0800
From: Dmitry Torokhov <dmitry.torokhov@gmail.com>
To: =?iso-8859-1?Q?Keng-Y=FC?= Lin <keng-yu.lin@canonical.com>
Cc: Martin Pitt <martin.pitt@canonical.com>,
        Corentin Chary <corentin.chary@gmail.com>,
        Matthew Garrett <mjg@redhat.com>, acpi4asus-user@lists.sourceforge.net,
        platform-driver-x86@vger.kernel.org, linux-kernel@vger.kernel.org,
        tyson.chen@canonical.com
Subject: Re: [PATCH] eeepc-wmi: set the touchpad toggle key code to F21
Message-ID: <20110225093332.GC14053@core.coreip.homeip.net>
References: <1298611140-21573-1-git-send-email-keng-yu.lin@canonical.com>
 <AANLkTim_JKQU9J3OJ0FRQ_ZVPktAPbnzr2t8SvhL2Uzj@mail.gmail.com>
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On Fri, Feb 25, 2011 at 05:22:43PM +0800, Keng-Y? Lin wrote:
> On Fri, Feb 25, 2011 at 3:18 PM, Dmitry Torokhov
> <dmitry.torokhov@gmail.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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