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

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Date:	Fri, 6 Nov 2015 13:17:28 +0000
From:	"Opensource [Adam Thomson]" <Adam.Thomson.Opensource@...semi.com>
To:	Mark Brown <broonie@...nel.org>,
	"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 November 6, 2015 11:55, Mark Brown wrote:

> > > > I can envisage in a system you may want to choose which capture channels can
> > > > trigger level detection (if any), and this may change depending on the use-case
> > > > at the time, so having it as a control makes sense to me.
> 
> > > What is a "capture channel" here?
> 
> > Input filters 1L/R and 2L/R, which are fed from either Mic1(ADC1) or DMic1L/R
> > and Mic2(ADC2) or DMic2L/R.
> 
> Hang on, is this just recording a DC value with the ADC and then looking
> at that?

The RMS of the Mic signal is taken and compared to the trigger level set. If
it's above that level then an IRQ is raised.