[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
Sat Feb 18 23:54:35 CET 2017


On Sat 2017-02-18 20:17:09, H. Nikolaus Schaller wrote:
> 
> > Am 18.02.2017 um 19:08 schrieb Pavel Machek <pavel at ucw.cz>:
> > 
> >>> And I agree that kernel should _not_ attempt rescaling itself, as it
> >>> would lose precision.
> >> 
> >> With an almost 1:1 mapping you won't loose precision.
> > 
> > How do you propose to do that?
> 
> something like
> 
> xinput --set-prop --type=float "TSC200X touchscreen" "Coordinate Transformation Matrix"  1.00 0.00 0.00  0.00 1.00 0.00  0.00 0.00 1.00
> 
> but I think it is the default of X11 if you use no coordinate transformation at all.
> And having the kernel to properly scale from ADC values to screen coordinates.
> 

No. How do you propose doing rescaling in the kernel without loosing
precision?
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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