[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
Sat Feb 18 20:17:09 CET 2017


> 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.

BR,
Nikolaus

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