AT86RF212 based USB-Stick (HUL)

[Josef Filzmaier <j.filzmaier@gmx.at>]

Hello everyone!

Disclaimer: I am new to kernel driver development

I'm trying to get the BUSWARE HUL stick [1] to work using the atusb driver.
I know this is not officially supported, but this stick is very similar to the 
rzusb stick which is stated work experimentally on the linux-wpan website.

I flashed the stick with the atben firmware using dfu-programmer and it seems to 
be working quite nicely.

I'm on Kernel 4.9 lts with arm architecture (raspberry pi b+)

I have modified the atusb driver to support the at86rf212 chip (inspired by the 
at86rf230 driver). It seems to be working just fine. I can configure the stick 
as i like with the iwpan tool, so the configuration over usb seems to be 
working. Also, i can see the wpan0 interface and can create a lowpan interface 
on top of it (as described on the lowpan website).

However, using the lowpan interface has no effect. No data gets sent over USB. 
I am able to capture the traffic using tshark, but the data never arrives at the 
atusb driver's atusb_xmit() function.

My idea currently is to put printk statements within the kernel to detect 
where the data gets lost. I can capture the data with wireshark so i should be 
able to find my calls somewhere in the kernel code.

Do you have any suggestions as to where i should start my debugging adventure? 
I cannot seem to find where a socket call is initiated and how it is propageted 
down to the driver level.

Any help welcome!

[1] http://www.busware.de/tiki-index.php?page=RF212USB

-- 
Josef Filzmaier