Re: [alsa-devel] Toneweal / Trigaudio FW66 device

[Takashi Sakamoto <o-takashi@sakamocchi.jp>]

Hi,

On Fri, Jan 24, 2020 at 10:16:53PM +0000, Daniel Jozsef wrote:
> $ ./firewire-request /dev/fw1 fcp 0x01ff3000ffffffff
> response: 000: 0c ff 30 07 0f 00 23 27                         ..0...#'
> $ ./firewire-request /dev/fw1 fcp 0x01ff3100ffffffff
> response: 000: 0c ff 31 00 08 60 ff ff                         ..1..`..
> $ ./firewire-request /dev/fw1 fcp 0x01ff0200ffffffff
> response: 000: 0c ff 02 00 02 02 04 03                         ........
> $ ./firewire-request /dev/fw1 fcp 0x01080200ffffffff
> response: 000: 0c 08 02 00 04 01 ff ff                         ........
> $ ./firewire-request /dev/fw1 fcp 0x01600200ffffffff
> response: 000: 0c 60 02 00 06 05 ff ff                         .`......
> 
> From what I gather from the reference you linked, this seems more or less
> what's expected, though I'm not entirely sure yet what it means for the
> device to have 6 destination and 5 source plugs on the music subunit... :D
> (If I read the specs correctly...)

You got it correctly. Here, let's back to FFADO log:

> Error (bebob_avplug.cpp)[ 237] discoverPlugType: Plug does not implement extended plug info plug type info command
> Error (bebob_avplug.cpp)[ 120] discover: discover: Could not discover plug type (1,1,0,0,1)
> Error (avc_subunit.cpp)[ 189] discoverPlugs: plug discover failed
> Error (avc_subunit.cpp)[ 131] discoverPlugs: destination plug discovering failed
> Error (avc_subunit.cpp)[  99] discover: plug discovery failed
> Error (avc_unit.cpp)[ 283] enumerateSubUnits: enumerateSubUnits: Could not discover subunit_id =  0, subunit_type =  1 (Audio)
> Error (avc_unit.cpp)[ 177] discover: Could not enumerate sub units

It's my mistake to interpret the target subunit to which the command
fails. It's 'Audio' subunit, not 'Music' subunit...

> plug type (1,1,0,0,1)
1 = node ID (=0xFF01)
1 = subunit type (=audio)
0 = subunit ID
0 = direction (=input)
1 = plug ID (=0x01)

The EXTENDED PLUG INFO command is one of specific command for BeBoB
solution and its specification is closed. In your case, 4 plugs are
detected as destination plug and 1 plug as source plug in Audio
subunit by AV/C PLUG INFO command for Audio subunit, thus below
commands are expected to return valid information as long as
implemented correctly:

(4 destination plugs = 4 input plugs)
(AV/C EXTENDED PLUG INFO command for input plugs of Music subunit)
$ ./firewire-request /dev/fw1 fcp 0x016002c0000100ffff00
$ ./firewire-request /dev/fw1 fcp 0x016002c0000101ffff00 (<-)
$ ./firewire-request /dev/fw1 fcp 0x016002c0000102ffff00
$ ./firewire-request /dev/fw1 fcp 0x016002c0000103ffff00
$ ./firewire-request /dev/fw1 fcp 0x016002c0000104ffff00 (should fail)

(1 source plug = 1 output plug)
(AV/C EXTENDED PLUG INFO command for output plugs of Music subunit)
$ ./firewire-request /dev/fw1 fcp 0x016002c0010100ffff00
$ ./firewire-request /dev/fw1 fcp 0x016002c0010101ffff00 (should fail)

However, some vendors seem to implement the above with less care of
compatibility, as long as I know. In your case, below command might
fail:

$ ./firewire-request /dev/fw1 fcp 0x016002c0000101ffff00 (<-)

I'd like you to execute the above commands and share their responses.


Regards

Takashi Sakamoto
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