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SubjectRe: Custom Driver to Serial Driver Read Interface Problem
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>  I am writing a kernel mode device driver which needs to read and write data
> from serial port ( /dev/ttyS1 in this case ).

You want to be a line discipline. Take a look at slip.c as an example. Thats
a line discipline one end and a network protocol the other. It gets called
when there is stuff for reading and room to send, it has calls to send more
data
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