[EMAIL PROTECTED] wrote: > While I appreciate the tremendous work done with the USB audio > support, I'm just not getting access to the featureset I want on my > extigy (external USB audigy card from cl).
What features are missing? > I admit I do not have much experience writing device drivers. However, > I'd like to believe myself to be technically competant enough with the > linux kernel to begin doing so. What I'm looking for here are a few > pointers and tips for where to start, what code to stare at for a > while, etc. The ALSA documentation is pretty good as is, but I think > I'd need a little more than that as far as driver development goes. The current state of ALSA driver development documentation is "Use the source, Luke!" Especially, there's alsa-kernel/drivers/dummy.c as an example driver. I'd suggest to read about generic Linux driver development. There's much useful information in the Documentation/ directory of the kernel, and there's <http://www.oreilly.com/catalog/linuxdrive2/chapter/book/>. For a USB audio driver, you have to read (and understand :) the relevant parts from the USB specification <http://www.usb.org/developers/docs.html> and from the Audio Class specifications <http://www.usb.org/developers/devclass_docs.html>. If your brain is still working after that :-) , read the files in alsa-kernel/usb/. > Is it fiesable? Would a driver need to be written from scratch? Could > I just hook some extentions into the present usb-audio driver? If the missing features are something already implemented in the ALSA driver but not describes by the USB descriptors, it would be possible to extend the quirk mechanism of the driver (currently, it's used for some USB MIDI devices). <http://www.cs.umass.edu/~cochran/> mentions the MIDI and IR parts of the Extigy have this problem. > Does Creative Labs even release enough info/specs to write a decent > driver? I didn't find any on their opensource website. I'd guess you'd have to sign an NDA. HTH Clemens ------------------------------------------------------- This sf.net email is sponsored by:ThinkGeek Welcome to geek heaven. http://thinkgeek.com/sf _______________________________________________ Alsa-devel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/alsa-devel
