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    SubjectRe: [PATCH 2/2] Input: tsc2007 - Add a z1_low_threshhold platform data parameter
    On Tue, 29 Nov 2011 17:23:10 +0800
    Dmitry Torokhov <dmitry.torokhov@gmail.com> wrote:

    > On Tue, Nov 29, 2011 at 04:12:58PM +0800, Feng Tang wrote:
    > > This originates from a patch in Meego IVI kernel with the name
    > > linux-2.6.37-connext-0027-tsc2007.patch
    > > There is no author info excepte a line "From MeeGo
    > > <kernel@meego.com>"
    > >
    > > When integrating tsc2007 on Intel IVI platform, there are a lot of
    > > noise data whose z1 value is around 10 which is not a sane "z1". So
    > > add a "z1_low_threshhold" to filter those nosie data, to make the
    > > device work properly.
    >
    > Sounds like a task for userspace to ignore pressure that is too low.
    > Bonus points for making it configurable so user can adjust
    > sensitivity.

    Actually, there is one more point :), without this patch, the driver won't
    work on our platforms.

    The tsc2007_soft_irq will keep reading the input data unless there is no
    valid pressure data. In our case, those noise data will be seen as valid
    data during tsc2007_calculate_pressure(), and the tsc2007_soft_irq will
    run endlessly.

    Thanks,
    Feng

    >
    > Thanks.
    >


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