how to calibrate the X touchscreen?

[Abhinav Duggal]

Hi all,
I want to calibrate the touchscreen. I have written a driver for X based on
the event interface.I think there is a module xcalibrateproto but I cannot
see it in proto branch
http://xorg.freedesktop.org/releases/X11R7.3/src/proto/. The Xext xcalibrate
uses xcalibrateproto.h.So where can I find this or is there any other way of
calibration?
Pl. help.
Thanks.
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