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

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On Wed, Mar 20, 2013 at 08:04:29PM -0400, jonsmirl@xxxxxxxxx wrote:
> On Wed, Mar 20, 2013 at 7:26 PM, Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx> wrote:
> > On Tue, Mar 19, 2013 at 11:30:05AM -0400, jonsmirl@xxxxxxxxx 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.
> 
> Is there an existing driver in the kernel that does this?
> So far all of the ones I've checked still need a user space app.

Look at the bluetooth drivers, they have their own line dicipline I
think.

greg k-h
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