Ideally, you can present it as a serial device, and put all the code in
the kernel. Look at other serial drivers in linux/drivers/char. _Linux
Device Drivers_ is a decent book, but doesn't cover the serial/tty
interfaces IIRC. Your best reference is always the kernel source code.
To actually submit a driver, read Documentation/SubmittingDrivers and
Documentation/SubmittingPatches.
Jeff
P.S. Fix your word wrap :)
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