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Date: Wed, 18 Nov 2009 11:03:38 +0800 From: Eric Miao <eric.y.miao@...il.com> To: Paul Parsons <lost.distance@...oo.com> Cc: pavel@....cz, rpurdie@...ys.net, lenz@...wisc.edu, linux-kernel@...r.kernel.org, Dirk@...er-online.de, arminlitzel@....de, metan@....cz, thommycheck@...il.com, linux-arm-kernel@...ts.infradead.org, dbaryshkov@...il.com, omegamoon@...il.com, utx@...guin.cz Subject: Re: [PATCH] hx4700: fix hx4700 touchscreen pressure values On Wed, Nov 18, 2009 at 8:22 AM, Paul Parsons <lost.distance@...oo.com> 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. > Is this generically true that the pressure is always inverted? Otherwise a platform specific field indicating this would be the better way to go. - eric -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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