Re: PATCH: Four function buttons on DELL Latitude X200

["H. Peter Anvin" <hpa@zytor.com>]

Followup to:  <E18LBeK-00046y-00@calista.inka.de>
By author:    Bernd Eckenfels <ecki@calista.eckenfels.6bone.ka-ip.net>
In newsgroup: linux.dev.kernel
>
> In article <m3d6ocjd81.fsf@Janik.cz> you wrote:
> > this patch add support for four functions key on DELL Latitude X200.
> 
> we need a more generic appoach to handle those key codes for various
> extensions. I think a pure software reconfiguration of the keymaps or a
> daemon trakcing the raw codes is fine. Perhaps we can make something like a
> hook into the kernel where all untrapped function keys are send to in raw
> format?
> 

The PC only has so many possible keycodes (with E0 and E1 it's still
in the sub-300 range.)  It won't fit within 128, but I would really
like an algorithmic mapping from scancodes to keycodes so we don't
continue to have this problem.

For example, using a 16-bit keycode model:


	Scancode		Keycode (binary)
	mxxxxxxx	 	m0000000 0xxxxxxx
	E0 mxxxxxxx		m0000000 1xxxxxxx
	E1 mxxxxxxx yyyyyyyy	mxxxxxxx yyyyyyyy

m = make/break bit

	-hpa

	
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