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

H. Nikolaus Schaller hns at goldelico.com
Mon Feb 20 17:49:53 CET 2017


Hi Sebastian,

> Am 19.02.2017 um 21:15 schrieb Sebastian Reichel <sre at kernel.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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