Re: [PATCH] Synaptics TouchPad driver for 2.5.70

[Vojtech Pavlik <vojtech@ucw.cz>]

On Sat, Jun 14, 2003 at 12:57:14AM +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.
> > > 
> > > OOps. Your right. I'm thinking the hardware returns a force value. What I 
> > > meant is since we have the hardware returning the pressure and the area 
> > > this data can be used. Knowing the area over which a pressure is applied 
> > > is a good thing. What do you think?
> > 
> > Definitely. Still it doesn't cover the multi-tap/gesture stuff.
> 
> How about EV_AREA
> codes = "which area"  1, 2, 3
> value = "How big of a area" 
> 
> struct input_event {
>         struct timeval time;
>         __u16 type;               EV_AREA
>         __u16 code;	          AREA_1
>         __s32 value;		  20
> };

Nice, but no devices are reporting such detailed info. If you have a
multi-finger tap, then the area reported is the area between the
fingers. 

-- 
Vojtech Pavlik
SuSE Labs, SuSE CR