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

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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
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