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

[Dmitry Torokhov <dmitry.torokhov-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

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-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> 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

------------------------------------------------------------------------------
Free Software Download: Index, Search & Analyze Logs and other IT data in 
Real-Time with Splunk. Collect, index and harness all the fast moving IT data 
generated by your applications, servers and devices whether physical, virtual
or in the cloud. Deliver compliance at lower cost and gain new business 
insights. http://p.sf.net/sfu/splunk-dev2dev