[alsa-devel] [PATCH] ASoC: Add max98371 codec driver

[Lars-Peter Clausen]

[...]
> +static struct reg_default max98371_reg[] = {
const
[...]
> +static const unsigned int max98371_gain_tlv[] = {
> +	0, 8, TLV_DB_SCALE_ITEM(0, 50, 0),
> +	9, 10, TLV_DB_SCALE_ITEM(500, 100, 0),
> +	11, 15, TLV_DB_SCALE_ITEM(0, 0, 0),
> +};

I don't think this works, you need to define a container. This is best done
using DECLARE_TLV_DB_RANGE().

> +
> +static const unsigned int max98371_noload_gain_tlv[] = {
> +	0, 11, TLV_DB_SCALE_ITEM(0, 100, 0),
> +};

Again, won't work I think, but since this is a single item, just just
DECLARE_TLV_DB_SCALE.

[...]
> +		pr_info("%s: format unsupported %d",
> +				__func__, params_format(params));

Not pr_info(), maybe dev_err() or drop it altogether. Same for the other
pr_info() calls.

> +static const struct snd_soc_dapm_widget max98371_dapm_widgets[] = {
> +	SND_SOC_DAPM_AIF_IN("DAI_OUT",
> +		"HiFi Playback", 0, SND_SOC_NOPM, 0, 0),

This doesn't seem to do anything, just drop it.

> +	SND_SOC_DAPM_DAC("DAC Enable",

I'd just call this DAC.

> +		"HiFi Playback", MAX98371_SPK_ENABLE, 0, 0),

Drop the "HiFi Playback" here and connect the DAC in the routes to the "HiFi
Playback" widget.

> +	SND_SOC_DAPM_SUPPLY("Global Enable",
> +		MAX98371_GLOBAL_ENABLE, 0, 0, NULL, 0),
> +	SND_SOC_DAPM_OUTPUT("SPK_OUT"),
> +};
> +static struct snd_soc_dai_ops max98371_dai_ops = {

const

> +	.set_fmt = max98371_dai_set_fmt,
> +	.hw_params = max98371_dai_hw_params,
> +};
> +
[...]
> +static struct snd_soc_codec_driver max98371_codec = {

const

> +	.controls = max98371_snd_controls,
> +	.num_controls = ARRAY_SIZE(max98371_snd_controls),
> +	.dapm_routes = max98371_audio_map,
> +	.num_dapm_routes = ARRAY_SIZE(max98371_audio_map),
> +	.dapm_widgets = max98371_dapm_widgets,
> +	.num_dapm_widgets = ARRAY_SIZE(max98371_dapm_widgets),
> +};
> +
> +static const struct regmap_config max98371_regmap = {
> +	.reg_bits         = 8,
> +	.val_bits         = 8,
> +	.max_register     = MAX98371_VERSION,
> +	.reg_defaults     = max98371_reg,
> +	.num_reg_defaults = ARRAY_SIZE(max98371_reg),
> +	.volatile_reg     = max98371_volatile_register,
> +	.readable_reg     = max98371_readable_register,
> +	.cache_type       = REGCACHE_RBTREE,
> +};
> +
> +static int max98371_i2c_probe(struct i2c_client *i2c,
> +		const struct i2c_device_id *id)
> +{
> +	struct max98371_priv *max98371;
> +	int ret, reg;
> +
> +	max98371 = devm_kzalloc(&i2c->dev,
> +			sizeof(*max98371), GFP_KERNEL);
> +	if (!max98371)
> +		return -ENOMEM;
> +
> +	i2c_set_clientdata(i2c, max98371);
> +	max98371->regmap = devm_regmap_init_i2c(i2c, &max98371_regmap);
> +	if (IS_ERR(max98371->regmap)) {
> +		ret = PTR_ERR(max98371->regmap);
> +		dev_err(&i2c->dev,
> +				"Failed to allocate regmap: %d\n", ret);
> +		return ret;
> +	}
> +
> +	ret = regmap_read(max98371->regmap, MAX98371_VERSION, &reg);
> +	if (ret < 0) {
> +		dev_info(&i2c->dev, "device error %d\n", ret);
> +		return ret;
> +	}
> +	dev_info(&i2c->dev, "device version %x\n", reg);

Drop this, it is just noise in the boot log.

> +
> +	ret = snd_soc_register_codec(&i2c->dev, &max98371_codec,
> +			max98371_dai, ARRAY_SIZE(max98371_dai));
> +	if (ret < 0) {
> +		dev_err(&i2c->dev, "Failed to register codec: %d\n", ret);
> +		return ret;
> +	}
> +	return ret;
> +}