linux-kernel - Re: [PATCH v2 1/2] ASoC: add support for TAS5805M digital amplifier

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Message-ID: <20220113221858.GA18380@nyquist.nev>
Date:   Fri, 14 Jan 2022 11:18:58 +1300
From:   Daniel Beer <daniel.beer@...rinstitute.com>
To:     Amadeusz Sławiński 
        <amadeuszx.slawinski@...ux.intel.com>
Cc:     alsa-devel@...a-project.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Andy Liu <andy-liu@...com>, Mark Brown <broonie@...nel.org>,
        Derek Simkowiak <derek.simkowiak@...rinstitute.com>
Subject: Re: [PATCH v2 1/2] ASoC: add support for TAS5805M digital amplifier

On Thu, Jan 13, 2022 at 10:18:27AM +0100, Amadeusz Sławiński wrote:
> > +static int tas5805m_vol_put(struct snd_kcontrol *kcontrol,
> > +			    struct snd_ctl_elem_value *ucontrol)
> > +{
> > +	struct snd_soc_component *component =
> > +		snd_soc_kcontrol_component(kcontrol);
> > +	struct tas5805m_priv *tas5805m =
> > +		snd_soc_component_get_drvdata(component);
> > +
> > +	if (!(volume_is_valid(ucontrol->value.integer.value[0]) &&
> > +	      volume_is_valid(ucontrol->value.integer.value[1])))
> > +		return -EINVAL;
> > +
> > +	mutex_lock(&tas5805m->lock);
> > +	tas5805m->vol[0] = ucontrol->value.integer.value[0];
> > +	tas5805m->vol[1] = ucontrol->value.integer.value[1];
> > +	dev_dbg(component->dev, "set vol=%d/%d (is_powered=%d)\n",
> > +		tas5805m->vol[0], tas5805m->vol[1], tas5805m->is_powered);
> > +	if (tas5805m->is_powered)
> > +		tas5805m_refresh_unlocked(component);
> > +	mutex_unlock(&tas5805m->lock);
> > +
> > +	return 0;
> > +}
> > +
> 
> put method should return '1' if value changed, so ALSA knows to inform
> userspace utilities about change. You can check if userspace is notified of
> changes with "alsactl monitor", you should see something like:
> node hw:2, #3 (2,0,0,ADC0 Capture Volume,0) VALUE
> when value changes.

Thanks, will fix this.

-- 
Daniel Beer
Firmware Engineer at Igor Institute
daniel.beer@...rinstitute.com or +64-27-420-8101
Offices in Seattle, San Francisco, and Vancouver BC or (206) 494-3312