[alsa-devel] Help requested: new HSS1394 MIDI back-end

[Sean M. Pappalardo - D.J. Pegasus]

Hello again.

On 05/27/2012 03:50 PM, Clemens Ladisch wrote:
> See the document "Writing an ALSA Driver", and look at the source code
> of other MIDI drivers, such as, for example, sound/usb/midi.c or the
> (untested) patch below.

Holy crap!! Thank you so much for that patch, Clemens! I just updated my 
kernel and tried it with the SCS.1m but unfortunately it reports an error:

firewire_ohci: isochronous cycle inconsistent
firewire_core: created device fw1: GUID 0012600000000000, S400
firewire_core: phy config: card 0, new root=ffc0, gap_count=5
snd_scs1x fw1.0: transaction failed: type error
snd_scs1x: probe of fw1.0 failed with error -5

Turning on the SCS.1d then yields:
firewire_core: phy config: card 0, new root=ffc2, gap_count=7
firewire_core: phy config: card 0, new root=ffc2, gap_count=7
firewire_core: created device fw2: GUID 0012600100000000, S400


I'm guessing the type error is around line 254 in scs1x.c, but where 
does tcode come from? (I'm totally green with systems and Firewire 
programming.) I glanced at the MIDI section of that "writing a driver" 
PDF before I wrote to this list. I guess I'll go actually read it now. :)

FYI, I'm now on kernel 3.2.18-rt23 #2 SMP PREEMPT x86_64.

> BTW: What is the output of "lsfirewire -v" for these devices?

device fw1:
   vendor ID: 0x001260
   model ID: 0x001000
   vendor: Stanton DJ
   model: SCS.1m
   guid: 0x0012600000000000
   units: 0x00a02d:0x010001
   unit fw1.0:
     model ID: 0x001000
     model: SCS.1m
     specifier ID: 0x00a02d
     version: 0x010001
device fw2:
   vendor ID: 0x001260
   model ID: 0x002000
   vendor: Stanton DJ
   model: SCS.1d
   guid: 0x0012600100000000
   units: 0x00a02d:0x010001
   unit fw2.0:
     model ID: 0x002000
     model: SCS.1d
     specifier ID: 0x00a02d
     version: 0x010001


bus 0, node 0: 080028:424296  Texas Instruments TSB41AB1/2
bus 0, node 1: 080028:424296  Texas Instruments TSB41AB1/2

I tried poking around with firewire-request read but didn't find 
anything interesting. (Then again, I don't really know what I'm looking 
at or for.)

Sincerely,
Sean M. Pappalardo
"D.J. Pegasus"
Mixxx Developer - Controller Specialist

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