On Wed, Mar 20, 2013 at 08:49:50PM -0400, jonsmirl@xxxxxxxxx wrote: > On Wed, Mar 20, 2013 at 8:38 PM, Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx> wrote: > > On Wed, Mar 20, 2013 at 08:25:15PM -0400, jonsmirl@xxxxxxxxx wrote: > >> 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. > > > > In your driver, just attach the line discipline directly to the tty > > device you create. You will not be using the "normal" usb-serial logic > > at all if you do this, but you should be fine, right? > > USB serial port is based on the FT2232 so we've been using that driver. > > Modifying that driver was my plan for doing this. I was hoping that > there was a more generic way to achieve the same effect. No, sorry, stick with doing this from userspace, it's a simple one-line udev rule, right? greg k-h -- 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
