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for future driver versions I've added a digtial I/O read via
endpoint in1. This is not yet used but might be used in the
future for low latency IO reads if all ports are input ports
and thus the write could be omitted.
Signed-off-by: Bernd Porr <mail@berndporr.me.uk>
Signed-off-by: Kyle McMartin <kyle@kernel.org>