Patch from abbotti@mev.co.uk (Ian Abbott):

Patch from abbotti@mev.co.uk (Ian Abbott):

I have added support for the following additional Amplicon 200 series boards to
the amplc_dio200 driver: PC212E, PC214E, PC215E, PC218E, PCI215.  These have a
mixture of 8255 dio chips and 8254 counter chips (except PC218E which has no 8255).

As well as changing comedi/drivers/amplc_dio200.c, the patch adds some extra
inline functions to comedi/drivers/8253.h and adds four extra INSN_CONFIG_xxx
defines to include/linux/comedi.h (for configuring clock and gate sources for
the counter subdevices).