Re: [Bluez-devel] Digianswer USB driver

[Marcel Holtmann <marcel@rvs.uni-bielefeld.de>]

Hi Jan,

> During my master thesis, I wrote a custom Linux USB Bluetooth driver to
> comply with my specific needs. I did this because I couldn't get bluez
> working. The hardware that was available to me, was some development
> boards from Digianswer a subsidiary of Motorola. They couldn't provide
> much help, since their official driver is for Microsoft products, and they
> have outsourced the development of their driver to another company in
> Denmark.
> 
> So I just wrote my own driver according to the Bluetooth USB specification
> and the spec for USB 1.1, and basically found that my driver didn't
> work:-(
> 
> A sniff program on a Windows computer then revealed that Digianswer for
> some strange reason uses a different value for their control requests,
> than what is expected. I changed my #define to the correct value, and my
> driver worked perfectly.
> 
> Later I tried to change the value, just to see if I could get bluez
> working, and I succeeded:-)
> 
> in hci_usb.h
> change
> #define HCI_CTRL_REQ         0x20
> to
> #define HCI_CTRL_REQ         0x40
> 
> And everything works just fine. Though it was a development board that I
> used, this change can possibly make bluez work with other Digianswer USB
> hardware stated as "not working" with Bluez
> 
> Maybe there could be a note on the webpage to potential users of
> Digianswer hardware, that this small hack could work?

thanks for this information. I always tried to get my hands on the
Digianswer Bluetooth devices, but I never got one. Do you have a spare
one for me?

Changing the bRequestType is such an ugly hack, but on the other side it
is a very simple change to get these devices supported by hci_usb. I
will write a patch for supporting Digianswer devices and H:2 Bluetooth
devices at the same time, but I need some more information about the
your device. Please send me the output of "cat /proc/bus/usb/devices"
and "hciconfig -a".

Regards

Marcel




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