Though when using GII inputs the exact type of device is fully
transparent to the program, information about the device that is
actually attached to a given gii input and origin id can be queried,
e.g. for configuration interfaces.
For giiQueryValInfo is used on devices, where giiQueryDeviceInfo(3)
has indicated that the device has one or more valuator axes and you
want to gather additional info about the physical equivalent of each
axis.The parameters inp and origin select the input to query
and valnumber selects the specific valuator (an input can have
multiple valuators).
The queried data is put into info. See
gii_cmddata_getvalinfo(3) for the description of the structure.
RETURN VALUE
Returns 0 on success (info is valid, then) or -1 otherwise.