Re: Plug and play for a tty line disciple networking device

[Greg KH <gregkh-hQyY1W1yCW8ekmWlsbkhG0B+6BGkLq7r@public.gmane.org>]

On Tue, Mar 19, 2013 at 11:30:05AM -0400, jonsmirl-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org wrote:
> How can you achieve plug and play for a ft2232 based USB serial device
> implementing 802.15.4 networking?
> 
> The device has a 802.15.4 SOC with a UART attached to a ft2232. With
> firmware loaded the only thing it can do is talk the 802.15.4 tty line
> discipline, it is not a general purpose serial port.
> 
> Right now the device works by plugging it in and it appears as a
> generic USB serial device like ttyUSB0. You then run a user space app
> which sets the line discipline, holds the port open and attaches it to
> the 6lowpan implementation in the networking code. But doing that is
> inconvenient and users needs to be trained to do it. Much simpler if
> we could just plug the device in and it worked.
> 
> We can add a EEPROM to the ft2232 to give it a unique USB ID.  Is it
> possible to make a kernel driver that see this ID, sets the line
> discipline and wires the serial port directly into the networking
> code?

Yes, you can do that.

greg k-h
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