getting started: USBpre support

getting started: USBpre support

[Jim Carroll]

Hi,

I'm having trouble getting started writing an alsa driver for my Sound Devices
USBpre microphone interface.  It is a full sound card, playing and recording
full duplex, but it also drives my condenser microphones with phantom power.  

I've been reading the linux kernel driver book, and Takashi Iwai's
writing-an-alsa-driver.pdf, but neither are quite applicable to my hardware. 

What else can I read to get started?  

I've been looking at the generic usb alsa driver, and starting to modify it for
my usb device... does anyone have a similar stand-alone kernel module project
that I could use as a starting place?

I'm on Ubuntu Breezy 2.6.12 and have some windows source for reference on how to
talk to the USBpre.

Thanks,
-Jim Carroll



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Re: getting started: USBpre support

[Clemens Ladisch]

Jim Carroll wrote:
> I'm having trouble getting started writing an alsa driver for my Sound
> Devices USBpre microphone interface.  It is a full sound card, playing and
> recording full duplex, but it also drives my condenser microphones with
> phantom power.
>
> I've been reading the linux kernel driver book, and Takashi Iwai's
> writing-an-alsa-driver.pdf, but neither are quite applicable to my hardware.
>
> What else can I read to get started?

Linux USB documentation, USB Audio specification

> I've been looking at the generic usb alsa driver, and starting to modify it
> for my usb device...

What changes are needed?  How does the USBpre differ from class-compliant
devices?

> does anyone have a similar stand-alone kernel module project that I could use
> as a starting place?

drivers/usb/class/audio.c is somewhat similar to usbaudio.c.

> I have some windows source for reference on how to talk to the USBpre.

Can it be published somewhere?


Regards,
Clemens


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