[alsa-devel] ALSA: usb-mixer: Add support for UAC2 devices

[Daniel Mack]

This patch series adds support for mixer interfaces in USB audio class
v2 devices. Successfully tested on a XMOS L1 eval kit. They apply on
top of the topic/usb branch.

There's a number significant differences between v1 and v2
implementations, which the patches itself may explain best :)

I moved most quirks out into a seperate file, and hope you agree that
it's cleaner that way. Most descriptors are now parsed with structs
which makes the code more readable. However, there are quite some
descriptors with variable field lengths so they can't be mapped into
structs. I introduces some macros to access these fields.

Again, please test this with v1 devices, as I can't be entirely
confident that I didn't break anything in the transition.

Thanks,
Daniel


[PATCH 1/6] linux/usb/audio.h: split header
[PATCH 2/6] ALSA: usb-mixer: use defines from audio.h
[PATCH 3/6] ALSA: usb-mixer: factor out quirks
[PATCH 4/6] ALSA: usb-mixer: rename usbmixer.[ch] -> mixer.[ch]
[PATCH 5/6] ALSA: usb-mixer: parse descriptors with structs
[PATCH 6/6] ALSA: usb-mixer: Add support for Audio Class v2.0