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Date:   Mon, 20 Feb 2017 17:49:53 +0100
From:   "H. Nikolaus Schaller" <hns@...delico.com>
To:     Sebastian Reichel <sre@...nel.org>
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 Sebastian,

> Am 19.02.2017 um 21:15 schrieb Sebastian Reichel <sre@...nel.org>:
> 
> 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.

Added. Patch set will come in some minutes (have to run checkpatch
first).

BR and thanks,
Nikolaus


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