[RFC] g_serial: Real tty device passthrough.

Hello.

We have a linux smartphone here with the GSM modem on /dev/ttySAC0 .
As now like to make this tty available to the host through g_serial.
This allows us faster development and testing.

The first idea we had was to splice /dev/ttygs* and /dev/ttySAC0
together in phone userspace. But how can we handle things like
baudrate change on the host, etc. The passthrough should be as
transparent as possible.

We now think about a solution like the ine used in file_storage.c .

Let the g_serial driver directly communicate with the device. Loading
the driver with something like

modprobe g_serial device=ttySAC0

should route the whole communication to /dev/ttySAC0 instead of
/dev/ttygs* .

Anybody already worked on something like this?

As we like to include all our code into mainline all comments on such
a solution are more then welcome.

regards
Stefan Schmidt

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