linux-kernel - Re: [PATCH v8 6/9] ASoC: codecs: wcd938x: add basic controls

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Message-ID: <20210608135933.GE4200@sirena.org.uk>
Date:   Tue, 8 Jun 2021 14:59:33 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Cc:     robh@...nel.org, devicetree@...r.kernel.org, perex@...ex.cz,
        alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
        lgirdwood@...il.com
Subject: Re: [PATCH v8 6/9] ASoC: codecs: wcd938x: add basic controls

On Tue, Jun 01, 2021 at 12:31:55PM +0100, Srinivas Kandagatla wrote:

> +static int wcd938x_rx_hph_mode_put(struct snd_kcontrol *kcontrol,
> +				   struct snd_ctl_elem_value *ucontrol)
> +{
> +	struct snd_soc_component *component = snd_soc_kcontrol_component(kcontrol);
> +	struct wcd938x_priv *wcd938x = snd_soc_component_get_drvdata(component);
> +
> +	wcd938x->hph_mode = ucontrol->value.enumerated.item[0];
> +
> +	return 0;
> +}

_put() should return true if it made a change, the same bug is present
in a lot of other drivers too.

> +static const struct snd_kcontrol_new wcd9380_snd_controls[] = {
> +	SOC_ENUM_EXT("RX HPH Mode", rx_hph_mode_mux_enum_wcd9380,
> +		     wcd938x_rx_hph_mode_get, wcd938x_rx_hph_mode_put),
> +	SOC_ENUM_EXT("TX0 MODE", tx_mode_mux_enum_wcd9380[0],
> +		     wcd938x_tx_mode_get, wcd938x_tx_mode_put),
> +	SOC_ENUM_EXT("TX1 MODE", tx_mode_mux_enum_wcd9380[1],
> +		     wcd938x_tx_mode_get, wcd938x_tx_mode_put),
> +	SOC_ENUM_EXT("TX2 MODE", tx_mode_mux_enum_wcd9380[2],
> +		     wcd938x_tx_mode_get, wcd938x_tx_mode_put),
> +	SOC_ENUM_EXT("TX3 MODE", tx_mode_mux_enum_wcd9380[3],
> +		     wcd938x_tx_mode_get, wcd938x_tx_mode_put),
> +};

Please don't use this pattern of indexing into arrays by absolute
number, it's error prone and hard to read.  Just declare static
variables for the enums and reference them individually.

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