How to force the class of a device

[Hans Petter Selasky]

On Thursday 06 January 2011 18:55:11 Frederic Praca wrote:
> Hello guys,
> I recently bought a guitar multieffect device BOSS ME-25. It has a USB
> interface which is used to transfer several settings between its memory
> and the computer.
> Off course, BOSS only delivers a program and a driver for Windows or
> Mac but I also found a program for Linux.
> The driver enables to use the ME-25 as a MIDI device but, dumping the
> device description, the device class is vendor specific as shown below :
> coruscant# usbconfig -u 1 -a 3 dump_device_desc
> ugen1.3: <ME-25 BOSS> at usbus1, cfg=0 md=HOST spd=FULL (12Mbps) pwr=ON
> 
>   bLength = 0x0012
>   bDescriptorType = 0x0001
>   bcdUSB = 0x0110
>   bDeviceClass = 0x00ff
>   bDeviceSubClass = 0x0000
>   bDeviceProtocol = 0x00ff
>   bMaxPacketSize0 = 0x0008
>   idVendor = 0x0582
>   idProduct = 0x0113
>   bcdDevice = 0x0100
>   iManufacturer = 0x0001  <BOSS>
>   iProduct = 0x0002  <ME-25>
>   iSerialNumber = 0x0000  <no string>
>   bNumConfigurations = 0x0001
> 
> 
> Is there a way to attach the device to the uaudio driver to use it as
> a MIDI device ? Well, is this as simple or not ? ;-)
> 

Hi,

The FreeBSD USB MIDI driver is part of the USB audio driver:

src/sys/dev/sound/usb/uaudio.c

You can try making it attach by modifying the uaudio_attach() routine, but it 
will only work given that the actual data format on the MIDI bulk endpoints 
are identical to the USB MIDI standard.

--HPS