iPod Nano (2nd) USB fun...

I just stumbled over that, and it seems that nobody else did yet (at least, I couldn’t find anything on google):


Bus 001 Device 007: ID 05ac:1260 Apple Computer, Inc.
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               2.00
  bDeviceClass            0 (Defined at Interface level)
  bDeviceSubClass         0
  bDeviceProtocol         0
  bMaxPacketSize0        64
  idVendor           0x05ac Apple Computer, Inc.
  idProduct          0x1260
  bcdDevice            0.02
  iManufacturer           1 Apple
  iProduct                2
  iSerial                 3 000A2700188443C7
  bNumConfigurations      2
  Configuration Descriptor:
  [...]
    Interface Descriptor:
  [...]
      bInterfaceClass         8 Mass Storage
  [...]
  Configuration Descriptor:
  [...]
    iConfiguration          4 iPod USB Interface
    Interface Descriptor:
  [...]
      bInterfaceClass         1 Audio
  [...]
      AudioControl Interface Descriptor:
  [...]
        wTerminalType      0x0201 Microphone
  [...]
        bDescriptorSubtype      3 (OUTPUT_TERMINAL)
        wTerminalType      0x0101 USB Streaming
  [...]
    Interface Descriptor:
  [...]
      bInterfaceClass         3 Human Interface Devices
It really looks like the iPod is exposing its Audio interface (and possibly the keys?) over USB as an alternate configuration. The linux snd-usb-sound didn’t worked out-of-the-box, so further investigation is required.