From mboxrd@z Thu Jan 1 00:00:00 1970 From: Greg KH Subject: Re: Plug and play for a tty line disciple networking device Date: Wed, 20 Mar 2013 17:14:24 -0700 Message-ID: <20130321001424.GA27981@kroah.com> References: <20130320232645.GC19779@kroah.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: Sender: linux-usb-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: "jonsmirl-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org" Cc: linux-usb-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-serial-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Alan Ott List-Id: linux-serial@vger.kernel.org On Wed, Mar 20, 2013 at 08:04:29PM -0400, jonsmirl-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org wrote: > On Wed, Mar 20, 2013 at 7:26 PM, Greg KH wrote: > > 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. > > 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 -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html