On Mon, Jun 26, 2017 at 02:22:24PM +0200, Pavel Machek wrote:

> > No, such systems can and do work absolutely fine with the existing
> > frameworks.  You just have non-upstream drivers that don't make any
> > effort to work within existing frameworks.  Most of the vendors came
> > round to doing the right thing on this some years ago.

> Take a look at ./drivers/hsi/clients/cmt_speech.c in your favourite
> kernel. It was merged in 2010 AFAICT.

That looks like it went in in 2015, not 2010 - the commit date is in
March 2015, I suspect the 2010 date comes from whatever vendor tree it
came from.  The code isn't super clear but it looks like a fairly
standard DSP streaming interface which should be supportable as a
compressed audio stream in ALSA (or regular one if the data is
uncompressed), there's no reason I can see for it to be done outside of
the standard audio framework.