[alsa-devel] How to add a new MIDI device to the usbaudio driver

Paul Menzel paulepanter at users.sourceforge.net
Tue Aug 23 11:03:24 CEST 2011

Am Dienstag, den 23.08.2011, 10:43 +0200 schrieb Daniel Mack:
> On Tue, Aug 23, 2011 at 9:35 AM, Kristian Amlie <kristian at amlie.name> wrote:
> > On 08/22/11 13:49, Daniel Mack wrote:
> >> It doesn't seem to be using a standard MIDI interface, but there's a
> >> chance that it accepts raw MIDI byte streams. Can you check the patch
> >> below?
> >
> > With that patch, the device shows up, but aseqdump does not report any
> > MIDI events after connecting to it.
> >
> > The Windows drivers are called "USB Serial Converter" and "USB Serial
> > Port", so maybe it's all wrapped in a different protocol. Does that name
> > ring a bell?
> That's possible, and it should be easy to support these type of
> devices in ALSA. However, some logic is neccessary to configure the
> hardware to its correct baud rate and hardware protocol. The easiest
> way to determine the setup sequence is certainly to sniff the Windows
> driver communication with some tool like usbsnoop. Can you give that a
> try?

… and ask the manufacturer about GNU/Linux support.

Something like, you bought the hardware and expect it to work
everywhere. Additionally they make money by selling the hardware and not
developing a driver, so they should publish the documentation and even
pay someone – like Daniel or Clemens ? – to write the support for their
hardware. (Only when they say they do not have any money or something
like that, you can also tell them to donate/provide free hardware for
the developer and a contact address to their M$ Windows developer for

I am putting Greg into CC for possible sample texts or insights/best
practices on how to approach manufacturers.


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