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Member "gpm-1.99.7/doc/drivers/README.evabs" of archive gpm-1.99.7.tar.gz:

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    1 
    2 This file tells how to use gpm with the driver for event-devices
    3 that use absolut coordiantes (evabs) like touchscreens. It was
    4 desigened and tested for eGalax controllers, but should work with
    5 others as well.
    6 
    7 
    8 		CALIBRATION
    9 		-----------
   10 
   11 Calibration is done with a configfile. It consists of a single
   12 line of 8 integers:
   13 
   14 ex_min ex_max ey_min ey_max sx_min sx_max sy_min sy_max
   15 
   16 The first four values (prefixed withe here) show the minimum and
   17 maximum values of coordinates the event-device delivers for
   18 x- and y-axis, respectivly. The last four values show range of 
   19 coordinates to which the input should be scaled, for example your
   20 screen resolution. This works for text-mode, too.
   21 
   22 An example for an 800x600 screen would look like this:
   23 
   24 50 1950 50 1950 0 799 0 599
   25 
   26 
   27 		GPM OPERATION
   28 		-------------
   29 
   30 You need to use the evabs devicetype to use this feature, a
   31 device that delivers the absolute coordinates a config-file
   32 that describes how to scale these coordinates, and a repeater-
   33 device used for output.
   34 The pseudo-file /proc/bus/input/devices should tell you which
   35 event-device to use.
   36 
   37 Usage example:
   38 
   39 gpm -t evabs  -m /dev/input/event2 -c /etc/gpm-calib.conf -R ps2