usbtouchscreen: add option for inverting X or Y axis

[rzr]

Invert Y is needed (together with swap XY) for some touchscreens,
at least for some of them :

• CarTft 8in4 (type=eGalax, USB=0eef:0001)
• LeadingTouch

Since there is not guarantee that
those above devices will all behave the same,
it's safer to configure them userland using udev rules.

This way is safer than hardcoding options per "recognized" model,
and possible regressions will be avoided in a first place.

Credits-to: Ondrej Zary linux@rainbow-software.org
Link: https://lkml.org/lkml/2015/6/7/191
Bug-Link: https://bugs.tizen.org/jira/browse/TC-2522
Cc: linux-input@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Philippe Coval philippe.coval@open.eurogiciel.org

[rzr]

Hi
I rebased on your branch, and created this request to get your attention since I havent got lot of feedback from LKML :

https://lkml.org/lkml/2015/6/7/191#

Since this version is better than my last one in LKML
I can post it again to lkml if it's your review is possitive ..

Thanks

[dtor]

On Sat, Jul 25, 2015 at 02:23:00AM -0700, rzr wrote:

Hi
I rebased on your branch, and created this request to get your attention since I havent got lot of feedback from LKML :

https://lkml.org/lkml/2015/6/7/191#

Since this version is better than my last one in LKML
I can post it again to lkml if it's your review is possitive ..

Yes, please repost on linux-input@vger.kernel.org (cc myslef).

Thanks!

Dmitry