linux-kernel - Re: [PATCH v2 1/3] ASoC: Add ESS ES9218P codec driver

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Message-ID: <ZGIOSwDduR+Ihe4p@finisterre.sirena.org.uk>
Date:   Mon, 15 May 2023 19:49:47 +0900
From:   Mark Brown <broonie@...nel.org>
To:     Aidan MacDonald <aidanmacdonald.0x0@...il.com>
Cc:     lgirdwood@...il.com, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
        perex@...ex.cz, tiwai@...e.com, alsa-devel@...a-project.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/3] ASoC: Add ESS ES9218P codec driver

On Mon, May 15, 2023 at 08:40:19AM +0100, Aidan MacDonald wrote:

> +++ b/sound/soc/codecs/ess-es9218p.c
> @@ -0,0 +1,805 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +/*
> + * Copyright (c) 2022-2023 Aidan MacDonald
> + */

Please make the entire comment a C++ one so things look more
intentional.

> +enum es9218p_supply_id {
> +	ES9218P_SUPPLY_AVDD,
> +	ES9218P_SUPPLY_VCCA,
> +	ES9218P_SUPPLY_AVCC3V3,
> +	ES9218P_SUPPLY_AVCC1V8,
> +	ES9218P_NUM_SUPPLIES
> +};
> +
> +static const char * const es9218p_supply_names[ES9218P_NUM_SUPPLIES] = {
> +	"avdd",
> +	"vcca",
> +	"avcc3v3",
> +	"avcc1v8",
> +};

These could easily get out of sync, it would be better to explicitly
assign the names to the slots identified by the constants

	[ES9218P_SUPPLY_VCCA] = "vcca",

for example.

> +static int es9218p_wide_write(struct regmap *regmap, unsigned int reg,
> +			      int count, unsigned int value)
> +{
> +	u8 data[4];
> +	int i;
> +
> +	for (i = 0; i < count; i++) {
> +		data[i] = value & 0xff;
> +		value >>= 8;
> +	}

This needs a bounds check to make sure we don't overflow data.

> +static int outlevel_put(struct snd_kcontrol *kcontrol,
> +			struct snd_ctl_elem_value *ucontrol)
> +{
> +	struct snd_soc_component *component = snd_soc_kcontrol_component(kcontrol);
> +	struct es9218p_priv *priv = snd_soc_component_get_drvdata(component);
> +
> +	priv->output_2v = ucontrol->value.enumerated.item[0];
> +	es9218p_update_amp_mode(component);
> +	return 1;
> +}

Running the mixer-test selftest on a card with this driver will report
that the driver generates spurious events when there is no change in
value and doesn't validate input.  Similar issues apply to the other
enums.

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