linux-kernel - Re: [PATCH] ASoC: cs42l42: Add control for audio slow-start switch

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Date:   Fri, 29 Oct 2021 18:03:25 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Richard Fitzgerald <rf@...nsource.cirrus.com>
Cc:     alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
        patches@...nsource.cirrus.com
Subject: Re: [PATCH] ASoC: cs42l42: Add control for audio slow-start switch

On Fri, Oct 29, 2021 at 05:13:05PM +0100, Richard Fitzgerald wrote:
> +static int cs42l42_slow_start_put(struct snd_kcontrol *kcontrol,
> +				  struct snd_ctl_elem_value *ucontrol)
> +{
> +	struct snd_soc_component *component = snd_soc_kcontrol_component(kcontrol);
> +	u8 val;
> +
> +	/* all bits of SLOW_START_EN much change together */
> +	switch (ucontrol->value.integer.value[0]) {
> +	case 0:
> +		val = 0;
> +		break;
> +	case 1:
> +		val = CS42L42_SLOW_START_EN_MASK;
> +		break;
> +	default:
> +		return -EINVAL;
> +	}
> +
> +	snd_soc_component_update_bits(component, CS42L42_SLOW_START_ENABLE,
> +				      CS42L42_SLOW_START_EN_MASK, val);
> +
> +	return 0;

This should return 1 if the value changed.

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