Re: [PATCH] hx4700: fix hx4700 touchscreen pressure values

Dmitry Torokhov
2009-11-18T17:39:37Z

On Wed, Nov 18, 2009 at 06:28:49PM +0100, Pavel Machek wrote:
> On Wed 2009-11-18 00:22:41, Paul Parsons wrote:
> > > Does pressure actually work as expected -- that is not inverted?
> > > Because I need this patch on spitz... but it may break your
> > > machine...
> >
> > You are right, the pressure values were being inverted on my hx4700.
> > Pressing hard generates somewhat lower Rt values than pressing lightly.
> >
> > Since typical hx4700 Rt values are close to (pressure_max/2) anyway,
> > the inverted and non-inverted values were not very different.
> > For example:
> >
> > Rt ts->pressure_max-Rt
> > 599 425
> > 562 462
> > 588 436
> > 570 454
> >
> > So by all means submit your ads7846.c patch; it will not break hx4700.
>
> Dmitry, those pressure values are reverted on more than one machine,
> and we do not have anyone reporting it works ok for them. Can we
> perhaps just.... fix it?

OK, so we have 4 instances where pressure is inverted and nobody wants
to come out with a non-inverted example... I'll queue for .33 then - .32
it too close to the release.

--
Dmitry