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

From Pali Rohár <pali.rohar@gmail.com>
Newsgroups linux.kernel
Subject Re: [PATCH v9 1/8] drivers:input:tsc2007: add new common binding names, pre-calibration, flipping and rotation
Date 2017-02-20 20:50 +0100
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References <sTnRT-15P-3@gated-at.bofh.it> <tcKNY-6k2-11@gated-at.bofh.it> <tcZtG-7aS-63@gated-at.bofh.it>
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Hi Nikolaus!

On Monday 20 February 2017 17:50:04 H. Nikolaus Schaller wrote:
> Hi Dmitry,
> 
> > Input driver may set resolution for given axis in units per mm (or
> > units per radian for rotational axis ABS_RX, ABS_RY, ABS_RZ), and
> > if you check the binding, you can use "touchscreen-x-mm" and
> > "touchscreen-y-mm" to specify the size of entire touch surface and
> > set resolution from it so that userspace can calculate the proper
> > scaling factor.
> 
> How is this information exposed by the kernel to user-space? By
> scanning the DT file or tree?

Set input_abs_set_res() from kernel. And in userspace call EVIOCGABS 
ioctl() on input device. Look at struct input_absinfo, you should have 
all needed information here. This is generic input interface, no DT is 
needed.

I hope that XServer is already using it for evdev devices...

For whole implementation look at evtest program. That should be good 
starting point for your userspace implementation.

While I'm watching this discussion... in my opinion kernel should just 
invert input axes (when needed) and should not do any other 
normalization or integer/floating-point re-calibration/re-calculation. 
If it correctly exports minimum value, maximum value and resolution then 
userspace can correctly re-scale input events to units which userspace 
needs (e.g. mapping into LCD screen pixels or whatever is needed).

-- 
Pali Rohár
pali.rohar@gmail.com

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Re: [PATCH v9 1/8] drivers:input:tsc2007: add new common binding  names, pre-calibration, flipping and rotation Dmitry Torokhov <dmitry.torokhov@gmail.com> - 2017-02-17 21:50 +0100
  Re: [PATCH v9 1/8] drivers:input:tsc2007: add new common binding  names, pre-calibration, flipping and rotation Sebastian Reichel <sre@kernel.org> - 2017-02-18 04:30 +0100
    Re: [PATCH v9 1/8] drivers:input:tsc2007: add new common binding names, pre-calibration, flipping and rotation "H. Nikolaus Schaller" <hns@goldelico.com> - 2017-02-18 12:40 +0100
      Re: [PATCH v9 1/8] drivers:input:tsc2007: add new common binding  names, pre-calibration, flipping and rotation Sebastian Reichel <sre@kernel.org> - 2017-02-19 00:50 +0100
        Re: [PATCH v9 1/8] drivers:input:tsc2007: add new common binding names, pre-calibration, flipping and rotation "H. Nikolaus Schaller" <hns@goldelico.com> - 2017-02-19 13:10 +0100
          Re: [PATCH v9 1/8] drivers:input:tsc2007: add new common binding  names, pre-calibration, flipping and rotation Sebastian Reichel <sre@kernel.org> - 2017-02-19 21:20 +0100
            Re: [PATCH v9 1/8] drivers:input:tsc2007: add new common binding names, pre-calibration, flipping and rotation "H. Nikolaus Schaller" <hns@goldelico.com> - 2017-02-20 18:00 +0100
  Re: [Letux-kernel] [PATCH v9 1/8] drivers:input:tsc2007: add new  common binding names, pre-calibration, flipping and rotation Andreas Kemnade <andreas@kemnade.info> - 2017-02-18 09:20 +0100
  Re: [PATCH v9 1/8] drivers:input:tsc2007: add new common binding  names, pre-calibration, flipping and rotation Pavel Machek <pavel@ucw.cz> - 2017-02-18 10:20 +0100
    Re: [PATCH v9 1/8] drivers:input:tsc2007: add new common binding names, pre-calibration, flipping and rotation "H. Nikolaus Schaller" <hns@goldelico.com> - 2017-02-18 12:40 +0100
      Re: [PATCH v9 1/8] drivers:input:tsc2007: add new common binding  names, pre-calibration, flipping and rotation Pavel Machek <pavel@ucw.cz> - 2017-02-18 19:10 +0100
        Re: [PATCH v9 1/8] drivers:input:tsc2007: add new common binding names, pre-calibration, flipping and rotation "H. Nikolaus Schaller" <hns@goldelico.com> - 2017-02-18 20:30 +0100
          Re: [PATCH v9 1/8] drivers:input:tsc2007: add new common binding  names, pre-calibration, flipping and rotation Pavel Machek <pavel@ucw.cz> - 2017-02-19 00:00 +0100
            Re: [PATCH v9 1/8] drivers:input:tsc2007: add new common binding names, pre-calibration, flipping and rotation "H. Nikolaus Schaller" <hns@goldelico.com> - 2017-02-19 13:10 +0100
              Re: [PATCH v9 1/8] drivers:input:tsc2007: add new common binding  names, pre-calibration, flipping and rotation Pavel Machek <pavel@ucw.cz> - 2017-02-19 15:20 +0100
                Re: [PATCH v9 1/8] drivers:input:tsc2007: add new common binding names, pre-calibration, flipping and rotation "H. Nikolaus Schaller" <hns@goldelico.com> - 2017-02-19 18:10 +0100
                Re: [PATCH v9 1/8] drivers:input:tsc2007: add new common binding  names, pre-calibration, flipping and rotation Pavel Machek <pavel@ucw.cz> - 2017-02-19 18:20 +0100
                Re: [PATCH v9 1/8] drivers:input:tsc2007: add new common binding names, pre-calibration, flipping and rotation "H. Nikolaus Schaller" <hns@goldelico.com> - 2017-02-19 19:00 +0100
                Re: [PATCH v9 1/8] drivers:input:tsc2007: add new common binding  names, pre-calibration, flipping and rotation Pavel Machek <pavel@ucw.cz> - 2017-02-19 20:10 +0100
                Re: [PATCH v9 1/8] drivers:input:tsc2007: add new common binding names, pre-calibration, flipping and rotation "H. Nikolaus Schaller" <hns@goldelico.com> - 2017-02-19 20:40 +0100
                Re: [PATCH v9 1/8] drivers:input:tsc2007: add new common binding  names, pre-calibration, flipping and rotation Pavel Machek <pavel@ucw.cz> - 2017-02-19 22:00 +0100
                Re: [PATCH v9 1/8] drivers:input:tsc2007: add new common binding names, pre-calibration, flipping and rotation "H. Nikolaus Schaller" <hns@goldelico.com> - 2017-02-19 23:10 +0100
                Re: [PATCH v9 1/8] drivers:input:tsc2007: add new common binding  names, pre-calibration, flipping and rotation Pavel Machek <pavel@ucw.cz> - 2017-02-19 23:30 +0100
                Re: [PATCH v9 1/8] drivers:input:tsc2007: add new common binding names, pre-calibration, flipping and rotation "H. Nikolaus Schaller" <hns@goldelico.com> - 2017-02-20 18:00 +0100
                Re: [PATCH v9 1/8] drivers:input:tsc2007: add new common binding  names, pre-calibration, flipping and rotation Pavel Machek <pavel@ucw.cz> - 2017-02-20 20:30 +0100
                Re: [PATCH v9 1/8] drivers:input:tsc2007: add new common binding names, pre-calibration, flipping and rotation "H. Nikolaus Schaller" <hns@goldelico.com> - 2017-02-20 21:30 +0100
                Re: [PATCH v9 1/8] drivers:input:tsc2007: add new common binding  names, pre-calibration, flipping and rotation Petr Cvek <petr.cvek@tul.cz> - 2017-02-20 23:30 +0100
                Re: [PATCH v9 1/8] drivers:input:tsc2007: add new common binding names, pre-calibration, flipping and rotation "H. Nikolaus Schaller" <hns@goldelico.com> - 2017-02-21 09:40 +0100
                Re: [Letux-kernel] [PATCH v9 1/8] drivers:input:tsc2007: add new  common binding names, pre-calibration, flipping and rotation Andreas Kemnade <andreas@kemnade.info> - 2017-02-19 23:40 +0100
                Re: [Letux-kernel] [PATCH v9 1/8] drivers:input:tsc2007: add new  common binding names, pre-calibration, flipping and rotation Pavel Machek <pavel@ucw.cz> - 2017-02-19 23:50 +0100
                Re: [Letux-kernel] [PATCH v9 1/8] drivers:input:tsc2007: add new common binding names, pre-calibration, flipping and rotation "H. Nikolaus Schaller" <hns@goldelico.com> - 2017-02-20 18:00 +0100
                Re: [Letux-kernel] [PATCH v9 1/8] drivers:input:tsc2007: add new  common binding names, pre-calibration, flipping and rotation Pavel Machek <pavel@ucw.cz> - 2017-02-20 20:40 +0100
                Re: [Letux-kernel] [PATCH v9 1/8] drivers:input:tsc2007: add new common binding names, pre-calibration, flipping and rotation "H. Nikolaus Schaller" <hns@goldelico.com> - 2017-02-20 21:30 +0100
                Re: [Letux-kernel] [PATCH v9 1/8] drivers:input:tsc2007: add new common binding names, pre-calibration, flipping and rotation "H. Nikolaus Schaller" <hns@goldelico.com> - 2017-02-20 22:00 +0100
  Re: [PATCH v9 1/8] drivers:input:tsc2007: add new common binding names, pre-calibration, flipping and rotation "H. Nikolaus Schaller" <hns@goldelico.com> - 2017-02-18 12:40 +0100
    Re: [PATCH v9 1/8] drivers:input:tsc2007: add new common binding  names, pre-calibration, flipping and rotation Dmitry Torokhov <dmitry.torokhov@gmail.com> - 2017-02-20 02:20 +0100
      Re: [PATCH v9 1/8] drivers:input:tsc2007: add new common binding names, pre-calibration, flipping and rotation "H. Nikolaus Schaller" <hns@goldelico.com> - 2017-02-20 18:00 +0100
        Re: [PATCH v9 1/8] drivers:input:tsc2007: add new common binding names, pre-calibration, flipping and rotation Pali Rohár <pali.rohar@gmail.com> - 2017-02-20 20:50 +0100
          Re: [PATCH v9 1/8] drivers:input:tsc2007: add new common binding names, pre-calibration, flipping and rotation "H. Nikolaus Schaller" <hns@goldelico.com> - 2017-02-20 21:40 +0100
            Re: [PATCH v9 1/8] drivers:input:tsc2007: add new common binding names, pre-calibration, flipping and rotation Pali Rohár <pali.rohar@gmail.com> - 2017-02-20 22:10 +0100
              Re: [PATCH v9 1/8] drivers:input:tsc2007: add new common binding names, pre-calibration, flipping and rotation "H. Nikolaus Schaller" <hns@goldelico.com> - 2017-02-20 22:30 +0100
                Re: [PATCH v9 1/8] drivers:input:tsc2007: add new common binding names, pre-calibration, flipping and rotation Pali Rohár <pali.rohar@gmail.com> - 2017-02-20 23:00 +0100
                Re: [PATCH v9 1/8] drivers:input:tsc2007: add new common binding names, pre-calibration, flipping and rotation "H. Nikolaus Schaller" <hns@goldelico.com> - 2017-02-21 07:50 +0100
                Re: [PATCH v9 1/8] drivers:input:tsc2007: add new common binding  names, pre-calibration, flipping and rotation Pali Rohár <pali.rohar@gmail.com> - 2017-02-21 10:00 +0100
          Re: [PATCH v9 1/8] drivers:input:tsc2007: add new common binding names, pre-calibration, flipping and rotation Pali Rohár <pali.rohar@gmail.com> - 2017-02-20 22:10 +0100
            Re: [PATCH v9 1/8] drivers:input:tsc2007: add new common binding names, pre-calibration, flipping and rotation "H. Nikolaus Schaller" <hns@goldelico.com> - 2017-02-20 22:30 +0100
              Re: [PATCH v9 1/8] drivers:input:tsc2007: add new common binding  names, pre-calibration, flipping and rotation Dmitry Torokhov <dmitry.torokhov@gmail.com> - 2017-02-20 23:00 +0100
                Re: [PATCH v9 1/8] drivers:input:tsc2007: add new common binding  names, pre-calibration, flipping and rotation Dmitry Torokhov <dmitry.torokhov@gmail.com> - 2017-02-20 23:30 +0100
                Re: [PATCH v9 1/8] drivers:input:tsc2007: add new common binding names, pre-calibration, flipping and rotation "H. Nikolaus Schaller" <hns@goldelico.com> - 2017-02-21 08:00 +0100
                Re: [PATCH v9 1/8] drivers:input:tsc2007: add new common binding  names, pre-calibration, flipping and rotation Petr Cvek <petr.cvek@tul.cz> - 2017-02-20 23:40 +0100
                Re: [PATCH v9 1/8] drivers:input:tsc2007: add new common binding names, pre-calibration, flipping and rotation Pali Rohár <pali.rohar@gmail.com> - 2017-02-20 23:50 +0100
                Re: [PATCH v9 1/8] drivers:input:tsc2007: add new common binding names, pre-calibration, flipping and rotation "H. Nikolaus Schaller" <hns@goldelico.com> - 2017-02-21 07:40 +0100
                Re: [PATCH v9 1/8] drivers:input:tsc2007: add new common binding  names, pre-calibration, flipping and rotation Pali Rohár <pali.rohar@gmail.com> - 2017-02-21 10:10 +0100
                Re: [Letux-kernel] [PATCH v9 1/8] drivers:input:tsc2007: add new  common binding names, pre-calibration, flipping and rotation Andreas Kemnade <andreas@kemnade.info> - 2017-02-21 18:20 +0100
              Re: [PATCH v9 1/8] drivers:input:tsc2007: add new common binding names, pre-calibration, flipping and rotation Pali Rohár <pali.rohar@gmail.com> - 2017-02-20 23:10 +0100
                Re: [PATCH v9 1/8] drivers:input:tsc2007: add new common binding names, pre-calibration, flipping and rotation "H. Nikolaus Schaller" <hns@goldelico.com> - 2017-02-21 08:00 +0100
          Re: [PATCH v9 1/8] drivers:input:tsc2007: add new common binding names, pre-calibration, flipping and rotation "H. Nikolaus Schaller" <hns@goldelico.com> - 2017-02-21 08:20 +0100
            Re: [PATCH v9 1/8] drivers:input:tsc2007: add new common binding  names, pre-calibration, flipping and rotation Pali Rohár <pali.rohar@gmail.com> - 2017-02-21 09:50 +0100
              Re: [Letux-kernel] [PATCH v9 1/8] drivers:input:tsc2007: add new  common binding names, pre-calibration, flipping and rotation Christ van Willegen <cvwillegen@gmail.com> - 2017-02-21 10:00 +0100
        Re: [PATCH v9 1/8] drivers:input:tsc2007: add new common binding  names, pre-calibration, flipping and rotation Pavel Machek <pavel@ucw.cz> - 2017-02-21 12:10 +0100

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