An alternative would be to modify the touch screen
kernel driver to send calibrated (and debounced, dejittered)
events to the kernel. But the kernel can't read/write calibration
data and adding /sys nodes to to that needs some daemon to
write it. I.e. also needs some "configuration".

not quite sure, if it applies -- but there's inputattach which si supposed to act as daemon between touchscreen and X, so that X may use normal input devices/drivers. since the tslib xorg driver has a known, reported, and yet still unfixed serious bug, i'd suppose it's rather dead -- so inputattach would be the way to go anyway.
i did not yet try to use it, but it's on my list for debian.

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