linux-kernel - Re: [PATCH v9 1/8] drivers:input:tsc2007: add new common binding names, pre-calibration, flipping and rotation

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Message-ID: <20170218091526.GC8937@amd>
Date:   Sat, 18 Feb 2017 10:15:27 +0100
From:   Pavel Machek <pavel@....cz>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:     "H. Nikolaus Schaller" <hns@...delico.com>,
        Sebastian Reichel <sre@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Benoît Cousson <bcousson@...libre.com>,
        Tony Lindgren <tony@...mide.com>,
        Russell King <linux@...linux.org.uk>,
        Arnd Bergmann <arnd@...db.de>,
        Michael Welling <mwelling@...e.org>,
        Mika Penttilä <mika.penttila@...tfour.com>,
        Javier Martinez Canillas <javier@....samsung.com>,
        Igor Grinberg <grinberg@...pulab.co.il>,
        "Andrew F. Davis" <afd@...com>, Mark Brown <broonie@...nel.org>,
        Jonathan Cameron <jic23@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Alexander Stein <alexander.stein@...tec-electronic.com>,
        Eric Engestrom <eric@...estrom.ch>,
        Hans de Goede <hdegoede@...hat.com>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        Petr Cvek <petr.cvek@....cz>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Hans Verkuil <hans.verkuil@...co.com>,
        Nick Dyer <nick@...anahar.org>,
        Siebren Vroegindeweij <siebren.vroegindeweij@...mail.com>,
        Michel Verlaan <michel.verl@...il.com>,
        linux-input@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org,
        letux-kernel@...nphoenux.org, linux-iio@...r.kernel.org,
        kernel@...a-handheld.com, Aaro Koskinen <aaro.koskinen@...ia.com>,
        Pali Rohár <pali.rohar@...il.com>,
        Andrey Gelman <andrey.gelman@...pulab.co.il>,
        Haibo Chen <haibo.chen@...escale.com>
Subject: Re: [PATCH v9 1/8] drivers:input:tsc2007: add new common binding
 names, pre-calibration, flipping and rotation

Hi!

> > 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.

									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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