Re: [PATCH] Synaptics TouchPad driver for 2.5.70

From: Vojtech Pavlik (
Date: Fri Jun 13 2003 - 15:38:46 EST

On Fri, Jun 13, 2003 at 09:25:09PM +0100, James Simmons wrote:

> Just as a idea for API. How about ABS_AREA or REL_AREA instead of
> ABS_MISC. The idea is the pressure value returned should be about
> the same if one presses hard with one finger or softly with a whole
> hand.

Huh? Force = Pressure x Area ... I think you're mixing up force and
pressure here.

> So to tell the difference between the two we can report the
> pressure and the area over which it acted. Say in virtual reality
> environment simulation poking a object hard with your finger would
> have a very different effect than placing your hand lightly on the
> object even tho they might register about the same pressure.

Vojtech Pavlik
SuSE Labs, SuSE CR
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