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

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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
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