You configure a probe just like almost everything else in emc: add the
right lines to a .hal file.  In this case, you will be writing a line to
connect a signal to the pin "motion.probe-input".  For example, if the
probe input is on parport pin 26*, you could write
    net probe parport.0.pin-26-in motion.probe-input

motion.probe-input must be TRUE for probe contact closed (touching),
FALSE for probe contact open.  So if your probe has a LOW voltage when
touching and a HIGH voltage when not touching, you'll have to use the
inverted signal instead:
    net probe parport.0.pin-26-in-invert motion.probe-input

Each location found by a G38.2 probing move can be written to a file
named in the special (PROBEOPEN) comment.

Relevant online documentation:
http://linuxcnc.org/docs/2.2/html/gcode_main.html#sub:G38.2:-Straight-Probe
http://linuxcnc.org/docs/2.2/html/man/man9/motion.9.html#PINS

Jeff
* Yes, I know there's no "pin 26"

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