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

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Message-ID: <20151106112141.GE18409@sirena.org.uk>
Date:	Fri, 6 Nov 2015 11:21:41 +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 Fri, Nov 06, 2015 at 11:11:38AM +0000, Opensource [Adam Thomson] wrote:
> On November 5, 2015 15:28, Mark Brown wrote:

> > > +static int da7218_mic_lvl_det_sw_put(struct snd_kcontrol *kcontrol,
> > > +				     struct snd_ctl_elem_value *ucontrol)
> > > +{

> > Why is this a user visible control?

> 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?

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