Re: snd-usb-audio - Driver for M-Audio Fast Track Pro

["Clemens Ladisch" <cladisch@fastmail.net>]

Peter Oehry wrote:
> Thibault Le Meur <Thibault.LeMeur@supelec.fr> wrote:
> 2. Another interesting thing is that in fact the device sensds the data
> little endian in 16-Bit mode and big endian in 24-Bit mode.

IIRC other M-Audio devices to that, too.  The reasons seems to be that
the device is basically big-endian, but the 16-bit interfaces are
designed to work with Windows' usbaudio.sys.

> For what I think it should be possible to switch modes without restarting
> the kernel module and switch on and off the device. It should be possible
> to switch the mode by resetting all interfaces and setting up the new
> altsets like the windows driver does. This would eventually need a new
> proc interace

Why proc?

If the configuration needs to be changed at runtime, and if the driver
cannot do this automatically, a mixer control would be the best solution.

> How do I know if I also need a quirk for the midi devices?

You need a quirk when there aren't any class-specific descriptors for
the MIDI port.


Regards,
Clemens

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