Some people have been asking me about this driver. (Asus Xonar cards are fairly high-end high definition cards using the CMI 8788 chip.)
I've finally gotten the code reasonably cleaned up, and converted to my interrupt free audio framework.
I'll probably start a case to get this integrated into late b137, or b138. Mostly its just running a bunch of tests at this point.
One problem I have is that I only have Xonar DX1 cards. (PCI.)
If someone is able to help me qualify the driver with build 137 (or a nightly build) of ON, please let me know. The more I can get this driver tested, the sooner I can get it integrated into OpenSolaris.