[alsa-devel] [PATCH 1/1] sound: usb-audio: support for Digidesign Mbox 2

[Damien Zammit]

Digidesign Mbox 2:
(altsettings & magic codes)
----------------------------

Analogue I/O: 	
Altsettings:
	2:3 (0x03), playback 	- no sr control in desc
	4:3 (0x85), capture @ 44.1/48
	5:3 (0x86), capture @ 44.1/48 ---- spdif ext clock?

Analogue I/O with S/PDIF external clock:
Altsettings:
	? - spdif light flashes in windows
	
S/PDIF I/O:
Altsettings:
	2:2 (0x03), playback 	- no sr control in desc
				- spdif light flashes in linux
	4:2 (0x85), capture  	- no sr control in desc
				- spdif light flashes in linux
		
IEC1937_AC3:
	3:6 (0x04), playback @ 44.1/48

Bit & Sample rate modes:
(Hex commands)
- All of these modes are definitely available on the Analogue altsettings
- Digidesign website claims SPDIF is capable of 24 bit samples,
  assume all modes are available on SPDIF altsettings.

44/16

22 01 00 01 03 00 03 00
44 ac 00

22 01 00 01 85 00 03 00
44 ac 00

22 01 00 01 86 00 03 00
44 ac 00


48/16

22 01 00 01 03 00 03 00
80 bb 00

22 01 00 01 85 00 03 00
80 bb 00

22 01 00 01 86 00 03 00
80 bb 00


44/24

a2 81 00 01 03 00 03 00
44 ac 00

a2 81 00 01 85 00 03 00
44 ac 00

a2 81 00 01 86 00 03 00
44 ac 00


48/24

a2 81 00 01 03 00 03 00
80 bb 00

a2 81 00 01 85 00 03 00
80 bb 00

a2 81 00 01 86 00 03 00
80 bb 00