lkml.org 
[lkml]   [2009]   [Nov]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    From
    Date
    SubjectRe: [PATCH] hx4700: fix hx4700 touchscreen pressure values
    On Wed, Nov 18, 2009 at 8:22 AM, Paul Parsons <lost.distance@yahoo.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@vger.kernel.org
    More majordomo info at http://vger.kernel.org/majordomo-info.html
    Please read the FAQ at http://www.tux.org/lkml/

    \
     
     \ /
      Last update: 2009-11-18 04:07    [W:2.356 / U:0.252 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site