status of echo staging driver?

[Greg KH]

On Fri, Jan 10, 2014 at 11:26:52AM +0800, Steve Underwood wrote:
> Hi Greg,
> 
> On 01/10/2014 11:09 AM, Greg KH wrote:
> > On Fri, Jan 10, 2014 at 10:45:42AM +0800, Steve Underwood wrote:
> >> Hi Greg,
> >>
> >> As David said, the echo cancellation module is widely used, and gives good
> >> service. We have had no reason to touch the code for a long time. The last
> >> thing I remember doing was to make a minor correction to filter gain, which
> >> avoided a distortion issue some people saw. That was in August 2008. I
> >> haven't heard any reports of problems since then.
> >>
> >> Regards,
> >> Steve
> >>
> >> On 01/10/2014 06:39 AM, David Rowe wrote:
> >>> Hi Greg,
> >>>
> >>> Development as been completed, and AFAIK it works just fine for many
> >>> people.  Is there anything that needs to be done from your side to get
> >>> it merged into the kernel?  Apologies if I'm missing something in the
> >>> development process.
> > What modules use this code, as it's really only a library.  Is it
> > out-of-tree drivers?
> >
> > thanks,
> >
> > greg k-h
> >
> Out of tree drivers are the main users - in particular, the Digium 
> drivers for their Asterisk telephony cards, and the Sangoma drivers for 
> their Wanpipe telephony cards. It is an option for the mISDN drivers in 
> the kernel tree, but I don't know if that is directly an option of what 
> is in the tree, or if you need to apply any out of tree patches to hook 
> mISDN into the echo canceller.

I don't see any in-kernel users of the oslec_* functions, is that how
they hook into the module?

> The main users being out of tree drivers is the reason there has not 
> been big pressure to get the canceller into the tree. However, that 
> doesn't mean it shouldn't be there.

I agree, just wanting to figure out what is going on here.

thanks,

greg k-h