Re: Creamware Noah, snd-usb-audio capable?

[Frank Barknecht <fbar@footils.org>]

Hallo,
Hartmut Geissbauer hat gesagt: // Hartmut Geissbauer wrote:

> reading the different entries in usbquirks.h it looks like they are
> taken from the usb-infos like lsusb provides. Is it very difficult to
> take the infos from lsusb and translate it to an quirk?
> I only need some quick advice and will try it by myself. A good
> (complex) example in my opinion is the "Roland SC-D70".

Well, others like Takashi or Clemens will be able to give better
answers,but I guess, it helps to get familiar with the USB-audio
specification. For example, for a short time I was investigating why
the Midi jacks on the Terratec Phase 26 aren't supported. 

I looked up the specification of usb-midi in
http://www.usb.org/developers/devclass_docs/midi10.pdf and also looked
very closely and for a long time at the lsusb output.  This interface
descriptor then looks very much like it must be the midi interface: 

    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        3
      bAlternateSetting       0
      bNumEndpoints           2
      bInterfaceClass       255 Vendor Specific Class
      bInterfaceSubClass      3 
      bInterfaceProtocol      0 
      iInterface              3 TerraTec PHASE 26 USB
  unknown descriptor type: 07 24 01 00 01 41 00
  unknown descriptor type: 06 24 02 01 10 00
  unknown descriptor type: 06 24 02 02 11 00
  unknown descriptor type: 09 24 03 01 12 01 11 01 00
  unknown descriptor type: 09 24 03 02 13 01 10 01 00
      Endpoint Descriptor:
        bLength                 9
        bDescriptorType         5
        bEndpointAddress     0x05  EP 5 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               none
        wMaxPacketSize         64
        bInterval               0
        bRefresh                0
        bSynchAddress           0
  unknown descriptor type: 05 25 01 01 10
      Endpoint Descriptor:
        bLength                 9
        bDescriptorType         5
        bEndpointAddress     0x86  EP 6 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               none
        wMaxPacketSize         64
        bInterval               0
        bRefresh                0
        bSynchAddress           0
  unknown descriptor type: 05 25 01 01 12
  Language IDs: (length=4)
     0409 English(US)


The main reason for my assumption is the value for bInterfaceNumber
which is "3" or 0x03 as it should be according to the USB spec which
requires for a "MIDI Adapter Standard MIDIStreaming Interface
Descriptor" to have this field set as follows: 

Offset Field                Size  Value   Description
...
6      bInterfaceSubclass   1     0x03   MIDISTREAMING.
...

All other bInterfaceNumber's in the Phase 26 output are *not* 3. (See
my entry on qbik.ch).

Unfortunatly that's as far as I got. I figure, now a quirk is needed,
but I don't know which one (it probably has something to do with the
endpoints or so.)

Nevertheless I don't have the Phase 26 anymore, so I cannot dig much
deeper.

ciao
-- 
 Frank Barknecht                               _ ______footils.org__


-------------------------------------------------------
The SF.Net email is sponsored by EclipseCon 2004
Premiere Conference on Open Tools Development and Integration
See the breadth of Eclipse activity. February 3-5 in Anaheim, CA.
http://www.eclipsecon.org/osdn