Apply coordinate transformation matrix for multi-head touchscreen

[Peter Hutterer]

On Mon, Jun 13, 2011 at 02:50:10PM +0000, Scott Jaffa wrote:
> I am working to get multiple touchscreen support working.
> Both devices currently come up, however I need to apply a coordinate transformation matrix to the input, as documented here:
> http://lists.freedesktop.org/archives/xorg/2010-April/049967.html
> 
> This works fine from the command line, however I have a pair of devices.  
> The touchscreens are uniquely identified via usb port with udev, so I have hardcoded /dev/input/ts1 and /dev/input/ts2 devices.  
> However, I cannot script the xinput command, as I do not know which devices are which from the xinput list output.  Each touchscreen reports two device ids:
> ⎡ Virtual core pointer                          id=2    [master pointer  (3)]
> ⎜   ↳ Virtual core XTEST pointer                id=4    [slave  pointer  (2)]
> ⎜   ↳ stylus                                    id=6    [slave  pointer  (2)]
> ⎜   ↳ eraser                                    id=7    [slave  pointer  (2)]
> ⎜   ↳ TPPS/2 IBM TrackPoint                     id=14   [slave  pointer  (2)]
> ⎜   ↳ HID 0430:0100                             id=11   [slave  pointer  (2)]
> ⎜   ↳ TS Device                                   id=12   [slave  pointer  (2)]
> ⎜   ↳ TS Device                                   id=13   [slave  pointer  (2)]
> ⎜   ↳ TS Device                                   id=14   [slave  pointer  (2)]
> ⎜   ↳ TS Device                                   id=15   [slave  pointer  (2)]
> 
> Is there a way to define the matrix in the xorg.conf file, 

no, sorry.

> or a way to match the ids above to their /dev/input device or USB port?  

http://who-t.blogspot.com/2011/06/linking-kernel-and-x-devices.html

Cheers,
  Peter