Re: PATCH: Four function buttons on DELL Latitude X200

[Andries Brouwer]

On Tue, Dec 10, 2002 at 10:34:44PM +0100, Pavel Machek wrote:

> > 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.
> 
> 								Pavel

Indeed. See, for example,

	http://www.win.tue.nl/~aeb/linux/kbd/scancodes-2.html#ss2.18

for a keyboard that uses 0x80 as a prefix.