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Revision as of 08:33, 15 November 2007 by ClemensLadisch (Talk | contribs)

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CMI8788 driver status


New beta driver available:


  • Playback on all other cards with AK4396 DACs should now work, too.
  • The driver now initializes the AC'97 codec whose analog mixer is used to route the analog inputs to the ADC. Analog recording should work from all inputs.
  • No input controls yet, all inputs (and their noise) are mixed together.


Rewritten from scratch. The driver name is now snd-oxygen or snd-virtuoso.

The second most important feature, the MIDI port, now works. (The most important feature, the colorful jack illumination on my Xonar card, is not controlled by software and has always worked.)

I tested analog playback and capture on my Xonar card. Other cards use different DACs/ADCs and still need testing.

to be tested:

  • analog playback on cards with AK4396 DACs (i.e., any card except Xonar):
    • at 32, 44.1, 48, 64, 88.2, 96, 176.4, 192 kHz
    • 16 or 24 bits
    • 2, 4, 6, 8 channels
    • volume controls for all eight channels
    • upmixing of stereo to rear and side channels
  • analog recording

not yet implemented:

  • front panel output
  • mixer controls for analog recording
  • controls for controlling SPDIF ports

known problems:

  • digital I/O doesn't work
  • some garbage at the beginning of recorded data → ADC needs more time to settle after clock switch

my TODO list

  1. CMI8788 driver
    ca. 85%
  2. use hrtimers in the MIDI sequencer
    ca. 25%
  3. usb-audio: allow shorter-than-1ms periods for high-speed devices (just remove the code that rounds periods to USB frames)
  4. usb-audio: handle MIDI write errors better
  5. move non-public headers out of linux/include/sound/
  6. PCI: annotate in-memory data structures read by bus master chips with __le/be
  7. implement (some?) OSS 4 API ioctls
  8. test (i.e., use) alsa-python
  9. use dev_printk?
  10. various subsystem send different and too many MIDI reset commands when a port is closed
  11. usb-audio: restructure
  12. OSS emulation by redirecting to user space (like FUSE, but we need ioctls and mmap)
  13. MIDI synth: support more sysex commands
  14. MIDI synth: MIDI tuning
  15. ymfpci: MIDI synth
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