User:ClemensLadisch

CMI8788 driver status

This driver is based on C-Media's driver (from the Bgears website; apparently it's so buggy that C-Media doesn't want to publish it).

Known BUGS:

• distorted output
• sometimes hangs the computer when loading the driver

On other words, it's completely unusable.

I think I won't be able to get the driver into a working state unless I have such a card myself. (It seems C-Media currently doesn't produce this chip.)

Missing features:

• Front panel output/input not yet supported.
• Mixer control handling needs to be rewritten.
• Missing support for volume controls of PCM1796 DAC (used on Asus Xonar).

my TODO list

1. CMI8788 driver
   ca. 70%
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)
   0%
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