linux-kernel - Re: [PATCH] ASoC: max98357a: Add mixer control to mute/unmute speaker

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Date:   Wed, 8 Dec 2021 20:40:54 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Ajit Kumar Pandey <AjitKumar.Pandey@....com>
Cc:     alsa-devel@...a-project.org, Vijendar.Mukunda@....com,
        Alexander.Deucher@....com, Basavaraj.Hiregoudar@....com,
        Sunil-kumar.Dommati@....com, Liam Girdwood <lgirdwood@...il.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ASoC: max98357a: Add mixer control to mute/unmute speaker

On Wed, Dec 08, 2021 at 08:21:31PM +0000, Mark Brown wrote:
> On Thu, Dec 09, 2021 at 12:28:49AM +0530, Ajit Kumar Pandey wrote:
> 
> > +static int speaker_mute_put(struct snd_kcontrol *kcontrol,
> > +			    struct snd_ctl_elem_value *ucontrol)
> > +{
> > +	struct snd_soc_component *component = snd_soc_kcontrol_component(kcontrol);
> > +	struct max98357a_priv *max98357a = snd_soc_component_get_drvdata(component);
> > +	int mode = ucontrol->value.enumerated.item[0];
> > +
> > +	max98357a->sdmode_switch = mode;
> > +	gpiod_set_value_cansleep(max98357a->sdmode, mode);
> > +	dev_dbg(component->dev, "set sdmode to %d", mode);
> 
> This looks like it should just be a DAPM widget - it's just a generic
> GPIO control, there's no connection with the CODEC that I can see so it
> definitely shouldn't be in the CODEC driver.  Often trivial stuff like
> this is done in the machine driver, though the simple-amplifier driver
> is probably a good fit here.

Actually now I look again the only control interface this driver has is
GPIOs but it does expose a digital interface with constraints as input
so doesn't fit within simple-amplifier.  However this is just powering
off the amplifier to achieve mute rather than a separate mute control so
it'd probably be better to use a SND_SOC_DAPM_PIN_SWITCH() for the
Speaker widget to do this, this would also end up addressing Jaroslav's
thing with the naming as a side effect.  Sorry about the confusion there.

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