Re: code review requested for tranzport driver

Hi Mike,

I'll answer to the best of my knowledge, which means only your question nr 1 
will get an answer :-)

> I have been working on a usb kernel driver for the frontier designs
> "tranzport" control surface. It's a pretty unique device - 20 character
> LCD, 7 lights, 21 buttons, and a shuttle wheel.
[...]
>
> OPEN QUESTIONS:
>
> 0) Is openusb in a usable state?
>
> 1) I see some usb drivers using a disconnect_mutex. Others are calling
> lock_kernel. Which is more correct? (this driver is running under linux-rt)

The Big Kernel Lock (BKL) is deprecated, especially for real-time operation. 
You should definitely use a mutex.

> 2) Will I need to request specific usb minor numbers for this (raw?, Alsa?)
>
> 3) Is there a midi layer that is a model of it's kind?
>
> 4) As this fits into the "audio" bucket - is it this list or the alsa list
> that would care about the patch(es) first? Or both?

Best regards,

Laurent Pinchart

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