Re: PATCH: Four function buttons on DELL Latitude X200

From: Pavel Machek (
Date: Tue Dec 10 2002 - 16:34:44 EST


> > In article <> 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

Well, nothing prevents keyboard manufacturers from using 0xe2 as a
prefix, too. I think there are really *weird* keyboards out there.


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