[alsa-devel] [PATCH] snd-usb-audio: bootup sequence provided for new device - Digidesign Mbox 2

[Takashi Iwai]

At Wed, 19 Aug 2009 03:52:17 +1000,
Damien Zammit wrote:
> 
> Digidesign Mbox 2 support for Linux - Damien Zammit 19/08/2009
> 
> dczammit at flop:~$ dmesg
> [132064.931715] ALSA sound/usb/usbaudio.c:3279: Sending Digidesign
> Mbox 2 boot sequence...
> [132064.934474] ALSA sound/usb/usbaudio.c:3306: device initialised!
> [132064.937473] ALSA sound/usb/usbaudio.c:3315: mbox2_boot: new boot
> length = 646
> [132064.945769] ALSA sound/usb/usbaudio.c:2814: 36:2:2: add audio endpoint 0x3
> [132064.950765] ALSA sound/usb/usbaudio.c:2814: 36:2:3: add audio endpoint 0x3
> [132064.957314] ALSA sound/usb/usbaudio.c:2814: 36:3:2: add audio endpoint 0x4
> [132064.961622] ALSA sound/usb/usbaudio.c:2814: 36:3:3: add audio endpoint 0x4
> [132064.964575] ALSA sound/usb/usbaudio.c:2814: 36:3:6: add audio endpoint 0x4
> [132064.971046] ALSA sound/usb/usbaudio.c:2814: 36:4:2: add audio endpoint 0x85
> [132064.973545] ALSA sound/usb/usbaudio.c:2814: 36:4:3: add audio endpoint 0x85
> [132064.979576] ALSA sound/usb/usbaudio.c:2814: 36:5:2: add audio endpoint 0x86
> [132064.982522] ALSA sound/usb/usbaudio.c:2814: 36:5:3: add audio endpoint 0x86
> [132064.986584] ALSA sound/usb/usbmidi.c:1357: created 1 output and 1
> input ports
> [132064.986955] usbcore: registered new interface driver snd-usb-audio
> dczammit at flop:~$
> 
> dczammit at flop:~$ ls /proc/asound/M2/
> id  midi0  pcm0c  pcm0p  pcm1c  pcm1p  pcm2p  stream0  stream1
> stream2  usbbus  usbid
> dczammit at flop:~$
> 
> dczammit at flop:~$ cat /proc/asound/M2/stream0
> Digidesign Mbox 2 at usb-0000:00:1d.1-1, full speed : USB Audio
> 
> Playback:
>   Status: Stop
>   Interface 2
>     Altset 2
>     Format: 0x20 (24 bits)
>     Channels: 2
>     Endpoint: 3 OUT (ASYNC)
>     Rates: 8000 - 48000 (continuous)
>   Interface 2
>     Altset 3
>     Format: 0x20 (24 bits)
>     Channels: 2
>     Endpoint: 3 OUT (ASYNC)
>     Rates: 8000 - 48000 (continuous)
> 
> Capture:
>   Status: Stop
>   Interface 5
>     Altset 2
>     Format: 0x20 (24 bits)
>     Channels: 2
>     Endpoint: 6 IN (ASYNC)
>     Rates: 8000 - 48000 (continuous)
>   Interface 5
>     Altset 3
>     Format: 0x20 (24 bits)
>     Channels: 2
>     Endpoint: 6 IN (SYNC)
>     Rates: 8000 - 48000 (continuous)
> dczammit at flop:~$
> 
> dczammit at flop:~$ cat /proc/asound/M2/stream1
> Digidesign Mbox 2 at usb-0000:00:1d.1-1, full speed : USB Audio #1
> 
> Playback:
>   Status: Stop
>   Interface 3
>     Altset 2
>     Format: 0x20 (24 bits)
>     Channels: 2
>     Endpoint: 4 OUT (ASYNC)
>     Rates: 8000 - 48000 (continuous)
>   Interface 3
>     Altset 3
>     Format: 0x20 (24 bits)
>     Channels: 2
>     Endpoint: 4 OUT (ASYNC)
>     Rates: 8000 - 48000 (continuous)
> 
> Capture:
>   Status: Stop
>   Interface 4
>     Altset 2
>     Format: 0x20 (24 bits)
>     Channels: 2
>     Endpoint: 5 IN (ASYNC)
>     Rates: 8000 - 48000 (continuous)
>   Interface 4
>     Altset 3
>     Format: 0x20 (24 bits)
>     Channels: 2
>     Endpoint: 5 IN (SYNC)
>     Rates: 8000 - 48000 (continuous)
> dczammit at flop:~$
> 
> dczammit at flop:~$ cat /proc/asound/M2/stream2
> Digidesign Mbox 2 at usb-0000:00:1d.1-1, full speed : USB Audio #2
> 
> Playback:
>   Status: Stop
>   Interface 3
>     Altset 6
>     Format: 0x2 (16 bits)
>     Channels: 2
>     Endpoint: 4 OUT (SYNC)
>     Rates: 8000 - 48000 (continuous)
> dczammit at flop:~$
> 
> I fixed the broken pipes!!  I can get speaker-test working, but I dont
> get any sound...
> 
> 1)
> Is format 0x20 (S24_3LE) supported yet?  I can't get it to work with
> jackd version 0.116.2

The format itself is supported well in the ALSA core.
At least, I don't get any bug report regarding it.

> 2)
> Which interfaces/altsettings should I disable?  I can't quite get the
> sound to come out.

Well, hard to say.  Trial and error...


Takashi