On Wed, Mar 20, 2013 at 8:25 PM, Marcel Holtmann <marcel@xxxxxxxxxxxx> wrote: > Hi Greg, > >>>>> 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. > > yes we do. And we also have a userspace tool (hciattach) to setup the line discipline. However the automatic setup can be easily automated with a simple udev rule. Doesn't hciattach have to hang around as a process holding the tty device open? > > Regards > > Marcel > -- Jon Smirl jonsmirl@xxxxxxxxx -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
