[SDL] Elo Touchscreen

[Leander Seige]

Hello,

i'd like to write a small program to read the coordinates
from elo touchscreen monitors. I found some code about
it in SDL_fbelo.c as well as in the XFree86's driver source.

I want to get a bounding box of the whole area which has
been touched, not only a simple x/y mouse coordinate.
So there are some interesting constants in both sources.
For instance ELO_RANGE_CHECK_MODE or
ELO_TRIM_MODE. But they are never used.

Any ideas where to find such information?

Thanks,
Leander