linux-kernel - Re: [PATCH] ASoC: rt5682: Add jack kcontrol

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Date:   Thu, 7 Apr 2022 17:00:55 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Akihiko Odaki <akihiko.odaki@...il.com>
Cc:     alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
        Jaroslav Kysela <perex@...ex.cz>,
        Oder Chiou <oder_chiou@...ltek.com>,
        Liam Girdwood <lgirdwood@...il.com>
Subject: Re: [PATCH] ASoC: rt5682: Add jack kcontrol

On Fri, Apr 08, 2022 at 12:46:04AM +0900, Akihiko Odaki wrote:
> On 2022/04/08 0:09, Mark Brown wrote:

> > Why not use DAPM for the jack?  Note that normally the jack is part of
> > the machine driver not the CODEC - there's no way the CODEC can know how
> > it's been wired in on any given system.

> It seems it is an unsual case where the codec knows the source of the jack.
> RT5682 has interrupts and registers for the jack; see e.g.
> rt5682_button_detect in sound/soc/codecs/rt5682.c for details.

That bit is very common but there's still machine specific aspects - is
the required hardware wired up, if it is wired up how exactly are things
wired (separate microphone jack, headset jack, one of many jacks?).  A
lot of the machine driver part of things is about labeling things so
that it can be displayed in a way that's easy to connect to the physical
system.  Generally the machine driver would define a jack and then
connect the CODEC to it.

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