Re: questions about usbmidi

[Thomas Rabe <raven@drehmoment.org>]

Clemens Ladisch wrote:
> Thomas Rabe wrote:
> 
>>Clemens Ladisch wrote:
>>
>>>If this is the only endpoint in the interface, you can omit the endpoint
>>>number and let the driver autodetect it.
>>
>>i don't really know if autodetection will work (for the lsusb see
>>below).
> 
> 
> All endpoints are in one interface, so it wouldn't work.

will i have more luck with snd_usbmidi_create_rawmidi? if yes, should i 
declare the relevant functions/structs needed for rawmidi in usbaudio.h 
or cut'n paste the stuff from usbmidi.c in my driver file?

>>the real problem are the kernel-oopses, the last message i get:
>>ports are created.
>>
>>8<------------------------------------------------------
>>Apr  9 17:57:05 konstruktor kernel: ALSA ../alsa-kernel/usb/usbmidi.c:782: created 2 output and 2 input ports
>>Apr  9 17:57:05 konstruktor kernel: Unable to handle kernel NULL pointer dereference at virtual address 00000004
> 
> 
> Well, this may indicate that the MIDI part works and that the error is in
> some other part of the driver. Does the oops still happen when you don't
> call snd_usb_create_midi_interface?

the driver works fine without calling snd_usb_create_midi_interface (no 
errors, all audiochannels are available). i just wondering why there is 
no error return but the oops. it's very hard to try out hacks, because i 
have to reboot after the oops (can't rmmod the driver and other alsa 
modules).


> HTH
> Clemens


Greetings,

Thomas Rabe.



-- mail: raven at drehmoment dot org
-- home: http://hal9000.drehmoment.org
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