Re: [PATCH] Bluetooth: Add support for BCM20702A0 [0489:e031]

[David Strobach <lalochcz@gmail.com>]

Hello,

> > > virtualbox and then running either usbmon or Wireshark on your Linux
> > > system should work just fine.
> > 
> > O.K., here's what I found: running windows in virtualbox first then 
> > shutting it down again: the adapter works in linux too until the next 
> > reboot (still have to load the module and echo the ID to new_ID because 
> > of the adapter not reconigzed by the actual bt module)
> > Doing a capture with wireshark on usb port 2 gives me the capture file 
> > attached.
> 
> so there is clearly some binary download in the capture file. It will
> most likely match the files that a referenced in the .inf file. However
> I am not reverse engineering this stuff for anybody. Someone else has to
> do that job.

based on the trace and the .hex files I extracted from the Windows driver 
package I wrote a simple python rampatch downloader script. I also started 
writing a downloader kernel module. I have two questions though.

Is there a need for a driver module at all?
The script seems to work well, so I think it would be sufficient to write a 
statically linked libusb based binary downloader and distribute it along with 
the rampatch files and an udev rule file.

If the module is needed for whatever reason, is there a way to implement it 
using btusb HCI interface functions?
The rampatch download process is basically a series of HCI commans sent to 
control or bulk out endpoint. I could of course implement the payload 
packaging myself, but I feel somehow, that a cleaner solution would be to use 
some common subsystem mechanism.

Regards

David