Hello, freebsd-hackers! How are you?
I want to write driver for some device, which is attached to
standard serial (COM, RS-232) port.
I want to make this driver full-featured -- with device node in
/dev, ioctl()s and other. But I don't want to re-implement all this
serial tty stuff, that is implemented in `sys/isa/sio.c'
In case of LPT we have `ppbus'. What should I do in case of COM
port? I want to `take' com port (any calls to corresponding /dev/ttydX,
/dev/cuaaX and other should failed after this), monitor com port
state (know about new bytes, etc) and after that detach from com
port (when device is shutdowned and switched off), so com port could
be used for other deviced (i.e. modem) without rebooting.
It looks like userland program, but I really NEED full-featured
driver, which is controlled via device node...
Lev Serebryakov
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