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

Pavel Machek pavel at ucw.cz
Sun Feb 19 20:05:47 CET 2017


> 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 at 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?


> 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.

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