Some idea about usb audio gadget driver.

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Hi ALSA and USB folks,

I plan to develop a usb audio gadget driver on Blackfin platform (can
be shared for other embedded system).

 - A new usb gadget driver which recognized by Linux/Windows PC as an
USB audio card.
 - There is an ALSA sound card on the same embedded device.
 - The usb gadget driver receives audio data from host and send them
to ALSA sound card to playback
 - The usb gadget driver send the audio data recorded by ALSA sound
card to host as recording.
 - The usb gadget driver response to some audio card control command
such as volume/mute control

Questions,

 - Is there any similar things on this planet?
 - How about gmidi usb midi gadget driver?
 - How can I open/playback/record/close a ALSA sound card in kernel
space not using alsalib in user space?

Thanks a lot
-Bryan
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