On Wed, Mar 20, 2013 at 8:14 PM, Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx> wrote: > 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. Bluetooth drivers use line discipline on UARTs. On USB they have their own set of Bluetooth descriptors. CAN over serial has a line discipline but it needs a user space app. > > greg k-h -- 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
