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

From Pavel Machek <pavel@ucw.cz>
Newsgroups linux.kernel
Subject Re: [PATCH v9 1/8] drivers:input:tsc2007: add new common binding names, pre-calibration, flipping and rotation
Date 2017-02-19 20:10 +0100
Message-ID <tcF1T-2M9-11@gated-at.bofh.it> (permalink)
References (5 earlier) <tcytr-7e0-3@gated-at.bofh.it> <tcAvf-8oP-5@gated-at.bofh.it> <tcD9M-1CL-29@gated-at.bofh.it> <tcDjr-1Gc-13@gated-at.bofh.it> <tcDW9-1Tw-5@gated-at.bofh.it>
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Hi!

> Hi Pavel,
> I love discussions with you :)

Unfortunately I can't say the same.

> > Am 19.02.2017 um 18:15 schrieb Pavel Machek <pavel@ucw.cz>:
> > 
> > 
> >>> Solve it properly. That means passing calibration
> >>> data from kernel to userland.
> >> 
> >> As written before, the really proper solution would be to provide floating
> >> or fixed point subpixel input events. Not arbitrarily scaling up in kernel
> >> and leaving downscaling to user space (where everybody can make it
> >> worse).
> > 
> > That has no advantages,
> 
> It has the advantage of providing you with the full precision of raw data (but
> properly scaled) so that you don't loose any bit of information. This is what
> you just asked for - one or two mails before.

Not really, right? No matter what kind of fixed point you introduce,
you'll still loose precision.

> > and floating point in kernel is hard. Also
> > you'd either have to invent new interface, or you'd break touchscreen
> > for people that already have their touchscreens calibrated.
> 
> No, I don't break calibration for people using a different chip.

So you propose your touchscreen to behave differently from all other
touchscreens in tree? That's just no-go.

> > Yes, that's not really proper solution, that just overengineered. Not
> > worth implementing. Pass calibration data to userland.
> 
> You seem to repeat yourself and just say which solution you prefer,
> but I am missing the arguments why your solution (Pass calibration data
> to userland) is right and the best one.
> Which problems does it solve?

All you described.

> Which one does it solve better than others?

It is not terminally ugly.

> How can you implement it in
> a stable and portable way?

Easily.

> How can you make sure that all user-space GUI
> systems can and will make use of this calibration data?

You can't, and you don't need to.

									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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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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