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

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Date:   Sun, 19 Feb 2017 21:15:16 +0100
From:   Sebastian Reichel <sre@...nel.org>
To:     "H. Nikolaus Schaller" <hns@...delico.com>
Cc:     Dmitry Torokhov <dmitry.torokhov@...il.com>,
        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>,
        Pavel Machek <pavel@....cz>,
        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,

On Sun, Feb 19, 2017 at 01:07:26PM +0100, H. Nikolaus Schaller wrote:
> I don't really remember when we noticed it first. Maybe it was
> back in tslib times some years ago where setting the sensitivity
> threshold made problems. We then carried along our patch for a
> long time in our local repo (and modified it several times) and
> only started upstreaming some months ago. [...]
> 
> AFAIK, GIMP and for example https://sourceforge.net/projects/xournal/ appear
> to be able to handle X pressure, but I haven't running and tested either one
> on our devices. Pressure is used in such drawing tools to simulate that some
> physical pens make wider strokes on higher pressure.
> 
> This seems to indicate that X can handle pressure in a non-boolean way, but rarely does.
> Especially I think the usual menu, click, drag, scroll gestures are only based
> on BTN_TOUCH status and not on ABS_PRESSURE. So it is rarely noticed to make
> a difference.

ok.

> >>> I suggest to put the resistance vs pressure thing in its own patch,
> >>> that also fixes tsc200x-core and merge it to linux-next after the
> >>> merge window.
> 
> Ok. I will propose a patch.

Thanks. I suggest to add this in the patch description:

While this patch changes the values reported to userspace,
ABS_PRESSURE is used rarely by userspace. Most software only
relies on BTN_TOUCH (boolean), which is not affected by this
patch. Some graphics software makes use of the interface and
does not work correctly with the currently used inverted
behaviour.

-- Sebastian

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