Stephen Cameron wrote:
> I have an Akai MPD16, it's a MIDI drum pad thingy.
> Using the regular MIDI port works with linux just fine, but
> I'd like to be able to use it using only USB, but it
> seems not to be supported, so I thought I'd try to
> add support myself.
>
> I've had some success, despite not really knowing what I'm doing.
> Not complete success, but close enough to complete
> success that I'm very encouraged.
>
> I added this into sound/usb/usbquirks.h:
>
> /* Akai devices */
> {
> USB_DEVICE_VENDOR_SPEC(0x09e8, 0x0062),
> .driver_info = (unsigned long) & (const struct snd_usb_audio_quirk) {
> .vendor_name = "AKAI Professional M.I. Corp.",
> .product_name = "AKAIpro MPD16 USB/MIDI PAD CONTROL UNIT",
You don't need to set these strings if they're already present in the
USB descriptors.
And if you need to set them, please use "AKAI"/"MPD16" because you aren't
paid by AKAI's marketing department. :-)
> .type = QUIRK_MIDI_RAW,
>
> And then when I tap out things on the Akai, they
> are played on my Yamaha Motif Rack. Well, then it
> sends something periodically (about 4 times per
> second) something which makes a small quiet sound
> on the Motif...
Your description indicates that the MPD16 doesn't actually use a raw
protocol.
Please uncomment the "#define DUMP_PACKETS" in sound/usb/usbmidi.c and
show the packets that are logged in the system log.
The output of "lsusb -v" might have some further clues.
> # ls -l /dev/snd/midi*
> crw------- 1 scameron root 14, 18 May 18 19:32 /dev/snd/midi1
> crw------- 1 scameron root 14, 34 May 18 19:32 /dev/snd/midi2
These two are OSS devices that should live in /dev. Something's wrong
with your udev rules.
Regards,
Clemens
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