auixp —
ATI IXP series integrated AC'97 audio device driver
auixp* at pci? dev ? function ?
audio* at audiobus?
The auixp device driver supports the integrated AC'97
  audio controller of the ATP IXP series I/O controller hub. Supported models
  include all the chips that have IXP-200 base functionality for codec
  communication and DAC/ADC DMA support.
The auixp device driver appeared in
  NetBSD 2.1.
The ‘SPDIF’ support is still rudimentary and not supported other
  than through the codec. ‘Quadrophonic’ and ‘Dolby
  5.1’ audio are supported but untested.