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

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Message-Id: <776DC6E2-5D58-40F4-8866-39D9002EF772@goldelico.com>
Date:   Mon, 20 Feb 2017 21:22:22 +0100
From:   "H. Nikolaus Schaller" <hns@...delico.com>
To:     Pavel Machek <pavel@....cz>
Cc:     Andreas Kemnade <andreas@...nade.info>,
        Mark Rutland <mark.rutland@....com>,
        Andrey Gelman <andrey.gelman@...pulab.co.il>,
        Michel Verlaan <michel.verl@...il.com>,
        Nick Dyer <nick@...anahar.org>,
        Tony Lindgren <tony@...mide.com>, linux-kernel@...r.kernel.org,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        linux-omap@...r.kernel.org, Russell King <linux@...linux.org.uk>,
        Aaro Koskinen <aaro.koskinen@...ia.com>,
        Javier Martinez Canillas <javier@....samsung.com>,
        Igor Grinberg <grinberg@...pulab.co.il>,
        Hans Verkuil <hans.verkuil@...co.com>,
        linux-input@...r.kernel.org, devicetree@...r.kernel.org,
        Pali Rohár <pali.rohar@...il.com>,
        Arnd Bergmann <arnd@...db.de>,
        Eric Engestrom <eric@...estrom.ch>,
        Hans de Goede <hdegoede@...hat.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mika Penttilä <mika.penttila@...tfour.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Petr Cvek <petr.cvek@....cz>,
        Siebren Vroegindeweij <siebren.vroegindeweij@...mail.com>,
        Haibo Chen <haibo.chen@...escale.com>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Sebastian Reichel <sre@...nel.org>, linux-iio@...r.kernel.org,
        "Andrew F. Davis" <afd@...com>, Mark Brown <broonie@...nel.org>,
        Benoît Cousson <bcousson@...libre.com>,
        kernel@...a-handheld.com, Michael Welling <mwelling@...e.org>,
        letux-kernel@...nphoenux.org, Jonathan Cameron <jic23@...nel.org>,
        Alexander Stein <alexander.stein@...tec-electronic.com>
Subject: Re: [Letux-kernel] [PATCH v9 1/8] drivers:input:tsc2007: add new common binding names, pre-calibration, flipping and rotation

Hi,

> Am 20.02.2017 um 20:32 schrieb Pavel Machek <pavel@....cz>:
> 
> Hi!
> 
>>> But if you have userspace that depends on touchscreen to be
>>> calibrated... that _is_ wrong.
>> 
>> User-space people and real users have the opposite opinion. They
>> prefer if a touch is plug&play. I.e. without need for calibration.
> 
> Some people prefer to calibrate their touchscreens; because of
> per-device variations, that gives better precision.
> 
> You can pass default calibration data from device tree to kernel to
> userland. But you can not force people to use that calibration.

Yes, you can do that if you want. I hope it became clear by the formula
in my last mail.

I just want to be able to do it the other way for those users who don't
care about this per-device variation.

BR,
Nikolaus


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