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Date:   Sat, 18 Feb 2017 10:15:27 +0100
From:   Pavel Machek <>
To:     Dmitry Torokhov <>
Cc:     "H. Nikolaus Schaller" <>,
        Sebastian Reichel <>,
        Mark Rutland <>,
        Benoît Cousson <>,
        Tony Lindgren <>,
        Russell King <>,
        Arnd Bergmann <>,
        Michael Welling <>,
        Mika Penttilä <>,
        Javier Martinez Canillas <>,
        Igor Grinberg <>,
        "Andrew F. Davis" <>, Mark Brown <>,
        Jonathan Cameron <>,
        Rob Herring <>,
        Alexander Stein <>,
        Eric Engestrom <>,
        Hans de Goede <>,
        Benjamin Tissoires <>,
        Petr Cvek <>,
        Mauro Carvalho Chehab <>,
        Hans Verkuil <>,
        Nick Dyer <>,
        Siebren Vroegindeweij <>,
        Michel Verlaan <>,,,,,,,, Aaro Koskinen <>,
        Pali Rohár <>,
        Andrey Gelman <>,
        Haibo Chen <>
Subject: Re: [PATCH v9 1/8] drivers:input:tsc2007: add new common binding
 names, pre-calibration, flipping and rotation


> > Well, there is some historic confusion wether this driver reports resistance
> > or pressure.
> > 
> > The unpatched tsc2007 driver does it wrong (please test!) and we fix it on
> > the fly (because a separate patch is much more complex than doing it right
> > immediately).
> > 
> > This ti,report-resistance property is a means to get the old (wrong) meaning back
> > in case someone urgently needs it and can't fix the user-space workaround which
> > he must be using.
> >
> > 
> > AFAIK there is no mainline board using the DT except ours (and the upcoming
> > OMAP5-Pyra), so we shouldn't care too much. If you prefer, you can remove this
> > compatibility property. We don't need it for our devices.

N900 is mainline and uses DT.

> > That the function name is wrong is a second issue and this double negation might
> > confuse a litte.
> > 
> > Please test on a real device if the patched driver reports pressure now (unless
> > ti,report-resistance is specified).
> I unfortunately can not test this driver as I do not have the hardware.
> So all my observations are from code and data sheets.
> That said, what is the values emitted as ABS_PRESSURE when finger is not
> touching the device, barely touching the device, or pressing firmly?
> It seems that between TSC2007, TSC2004, TSC2005, and ADS7846, we have
> confusion as to what is being reported.
> I am adding a few more folks to the CC so we can try and soft this out.
> Sebastian, Pali, Pavel, any input here?

X work ok on N900. Nikolaus wrote rather long email, but I'm not what
the meaning is and what is supposed to be broken there.

I do this on X startup:

xinput --set-prop --type=float "TSC200X touchscreen" "Coordinate Transformation Matrix"  1.10 0.00 -0.05  0.00 1.18 -0.10  0.00 0.00 1.00
xinput --set-prop --type=int "TSC200X touchscreen" "Evdev Axis Inversion" 0 1
xinput --set-prop --type=float "TSC2005 touchscreen" "Coordinate Transformation Matrix"  1\
.10 0.00 -0.05  0.00 1.18 -0.10  0.00 0.00 1.00
xinput --set-prop --type=int "TSC2005 touchscreen" "Evdev Axis Inversion" 0 1

And I agree that kernel should _not_ attempt rescaling itself, as it
would lose precision. Providing default calibration info is ok.

(cesky, pictures)

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