probe() takes a struct isa_device pointer as an argument and returns
an int. The return value is ``zero'' or ``non-zero'' as to the absence
or presence of your device. This entry point may (and probably should)
be declared as static because it is accessed via the probe member
of the struct isa_driver structure. This function is intended
to detect the presence of your device only; it should not do any
configuration of the device itself.
attach() also takes a struct isa_device pointer as an argument and
returns an int. The return value is also ``zero'' or ``non-zero'' indicating
whether or not the attach was successful. This function is intended
to do any special initialization of the device as well as confirm that
the device is usable. It too should be declared static because
it is accessed through the attach member of the isa_driver
structure.