linux-kernel - Re: [PATCH 2/2] ASoC: codecs: Add da7218 codec driver

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Date:	Tue, 10 Nov 2015 14:15:13 +0000
From:	Mark Brown <broonie@...nel.org>
To:	"Opensource [Adam Thomson]" <Adam.Thomson.Opensource@...semi.com>
Cc:	Liam Girdwood <lgirdwood@...il.com>,
	Jaroslav Kysela <perex@...ex.cz>,
	Takashi Iwai <tiwai@...e.com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	"alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Support Opensource <Support.Opensource@...semi.com>
Subject: Re: [PATCH 2/2] ASoC: codecs: Add da7218 codec driver

On Tue, Nov 10, 2015 at 01:55:30PM +0000, Opensource [Adam Thomson] wrote:
> On November 9, 2015 14:02, Mark Brown wrote:

> > The general userspace expectation is that the detection is always active
> > and consistent rather than varying at runtime - runtime variability
> > might be a bit surprising for it, and even then variability in what is
> > detected based on other settings is a bit surprising.  If the hardware
> > is that limited I guess it's about all that can be done but I'm still
> > not clear what the use cases are for configuring the levels (as opposed
> > ot the routing).

> How about the example of always on voice in Android, which can be enabled and
> disabled, depending on user settings, and routing will vary depending on which
> mic is in use at the time? For the levelling is it not plausible that a user
> could configure the level based on their current environment. You have
> moderately loud background noise, then your threshold would want to be
> higher, but in a quiet environment the likelihood is you would want to lower
> that threshold?

So this *isn't* a normal mic detection feature?  What's the userspace
interface for reporting then?

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