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Subject: Re: [PATCH v2 1/2] ASoC: tas5720.c: cleanup variant management
To:     Nikolaus Voss <nikolaus.voss@loewensteinmedical.de>,
        Liam Girdwood <lgirdwood@gmail.com>,
        Mark Brown <broonie@kernel.org>,
        Jaroslav Kysela <perex@perex.cz>,
        Takashi Iwai <tiwai@suse.com>,
        Andreas Dannenberg <dannenberg@ti.com>,
        Kate Stewart <kstewart@linuxfoundation.org>
CC:     <alsa-devel@alsa-project.org>, <linux-kernel@vger.kernel.org>,
        <linux-acpi@vger.kernel.org>, <nv@vosn.de>
References: <20190628143037.GH5379@sirena.org.uk>
 <cover.1561988282.git.nikolaus.voss@loewensteinmedical.de>
 <c79df50175d59265a37c5e7c8a0cfbf8119bcf78.1561988282.git.nikolaus.voss@loewensteinmedical.de>
From:   "Andrew F. Davis" <afd@ti.com>
Message-ID: <80af3fca-f71b-c118-e5d8-fde8b7d21705@ti.com>
Date:   Mon, 1 Jul 2019 10:25:04 -0400
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On 7/1/19 9:42 AM, Nikolaus Voss wrote:
> Replace enum tas572x_type with struct tas5720_variant which aggregates
> variant specific stuff and can be directly referenced from an id table.
> 
> Signed-off-by: Nikolaus Voss <nikolaus.voss@loewensteinmedical.de>
> ---
>  sound/soc/codecs/tas5720.c | 98 +++++++++++++-------------------------
>  1 file changed, 33 insertions(+), 65 deletions(-)
> 
> diff --git a/sound/soc/codecs/tas5720.c b/sound/soc/codecs/tas5720.c
> index 37fab8f22800..b2e897f094b4 100644
> --- a/sound/soc/codecs/tas5720.c
> +++ b/sound/soc/codecs/tas5720.c
> @@ -28,9 +28,10 @@
>  /* Define how often to check (and clear) the fault status register (in ms) */
>  #define TAS5720_FAULT_CHECK_INTERVAL		200
>  
> -enum tas572x_type {
> -	TAS5720,
> -	TAS5722,
> +struct tas5720_variant {
> +	const int device_id;
> +	const struct regmap_config *reg_config;
> +	const struct snd_soc_component_driver *comp_drv;
>  };
>  
>  static const char * const tas5720_supply_names[] = {
> @@ -44,7 +45,7 @@ struct tas5720_data {
>  	struct snd_soc_component *component;
>  	struct regmap *regmap;
>  	struct i2c_client *tas5720_client;
> -	enum tas572x_type devtype;
> +	const struct tas5720_variant *variant;

Why add a new struct? Actually I don't see the need for this patch at
all, the commit message only explains the 'what' not the 'why'. We can
and do already build this info from the tas572x_type.

Also below are several functional changes, the cover letter says this is
not a functional change, yet the driver behaves differently now.

Andrew

>  	struct regulator_bulk_data supplies[TAS5720_NUM_SUPPLIES];
>  	struct delayed_work fault_check_work;
>  	unsigned int last_fault;
> @@ -179,17 +180,13 @@ static int tas5720_set_dai_tdm_slot(struct snd_soc_dai *dai,
>  		goto error_snd_soc_component_update_bits;
>  
>  	/* Configure TDM slot width. This is only applicable to TAS5722. */
> -	switch (tas5720->devtype) {
> -	case TAS5722:
> +	if (tas5720->variant->device_id == TAS5722_DEVICE_ID) {
>  		ret = snd_soc_component_update_bits(component, TAS5722_DIGITAL_CTRL2_REG,
>  						    TAS5722_TDM_SLOT_16B,
>  						    slot_width == 16 ?
>  						    TAS5722_TDM_SLOT_16B : 0);
>  		if (ret < 0)
>  			goto error_snd_soc_component_update_bits;
> -		break;
> -	default:
> -		break;
>  	}
>  
>  	return 0;
> @@ -277,7 +274,7 @@ static void tas5720_fault_check_work(struct work_struct *work)
>  static int tas5720_codec_probe(struct snd_soc_component *component)
>  {
>  	struct tas5720_data *tas5720 = snd_soc_component_get_drvdata(component);
> -	unsigned int device_id, expected_device_id;
> +	unsigned int device_id;
>  	int ret;
>  
>  	tas5720->component = component;
> @@ -301,21 +298,9 @@ static int tas5720_codec_probe(struct snd_soc_component *component)
>  		goto probe_fail;
>  	}
>  
> -	switch (tas5720->devtype) {
> -	case TAS5720:
> -		expected_device_id = TAS5720_DEVICE_ID;
> -		break;
> -	case TAS5722:
> -		expected_device_id = TAS5722_DEVICE_ID;
> -		break;
> -	default:
> -		dev_err(component->dev, "unexpected private driver data\n");
> -		return -EINVAL;
> -	}
> -
> -	if (device_id != expected_device_id)
> +	if (device_id != tas5720->variant->device_id)
>  		dev_warn(component->dev, "wrong device ID. expected: %u read: %u\n",
> -			 expected_device_id, device_id);
> +			 tas5720->variant->device_id, device_id);
>  
>  	/* Set device to mute */
>  	ret = snd_soc_component_update_bits(component, TAS5720_DIGITAL_CTRL2_REG,
> @@ -637,7 +622,6 @@ static int tas5720_probe(struct i2c_client *client,
>  {
>  	struct device *dev = &client->dev;
>  	struct tas5720_data *data;
> -	const struct regmap_config *regmap_config;
>  	int ret;
>  	int i;
>  
> @@ -646,20 +630,10 @@ static int tas5720_probe(struct i2c_client *client,
>  		return -ENOMEM;
>  
>  	data->tas5720_client = client;
> -	data->devtype = id->driver_data;
>  
> -	switch (id->driver_data) {
> -	case TAS5720:
> -		regmap_config = &tas5720_regmap_config;
> -		break;
> -	case TAS5722:
> -		regmap_config = &tas5722_regmap_config;
> -		break;
> -	default:
> -		dev_err(dev, "unexpected private driver data\n");
> -		return -EINVAL;
> -	}
> -	data->regmap = devm_regmap_init_i2c(client, regmap_config);
> +	data->variant = (const struct tas5720_variant *)id->driver_data;
> +
> +	data->regmap = devm_regmap_init_i2c(client, data->variant->reg_config);
>  	if (IS_ERR(data->regmap)) {
>  		ret = PTR_ERR(data->regmap);
>  		dev_err(dev, "failed to allocate register map: %d\n", ret);
> @@ -678,42 +652,36 @@ static int tas5720_probe(struct i2c_client *client,
>  
>  	dev_set_drvdata(dev, data);
>  
> -	switch (id->driver_data) {
> -	case TAS5720:
> -		ret = devm_snd_soc_register_component(&client->dev,
> -					&soc_component_dev_tas5720,
> -					tas5720_dai,
> -					ARRAY_SIZE(tas5720_dai));
> -		break;
> -	case TAS5722:
> -		ret = devm_snd_soc_register_component(&client->dev,
> -					&soc_component_dev_tas5722,
> -					tas5720_dai,
> -					ARRAY_SIZE(tas5720_dai));
> -		break;
> -	default:
> -		dev_err(dev, "unexpected private driver data\n");
> -		return -EINVAL;
> -	}
> -	if (ret < 0) {
> -		dev_err(dev, "failed to register component: %d\n", ret);
> -		return ret;
> -	}
> -
> -	return 0;
> +	ret = devm_snd_soc_register_component(&client->dev,
> +					      data->variant->comp_drv,
> +					      tas5720_dai,
> +					      ARRAY_SIZE(tas5720_dai));
> +	return ret;
>  }
>  
> +static const struct tas5720_variant tas5720 = {
> +	.device_id = TAS5720_DEVICE_ID,
> +	.reg_config = &tas5720_regmap_config,
> +	.comp_drv = &soc_component_dev_tas5720,
> +};
> +
> +static const struct tas5720_variant tas5722 = {
> +	.device_id = TAS5722_DEVICE_ID,
> +	.reg_config = &tas5722_regmap_config,
> +	.comp_drv = &soc_component_dev_tas5722,
> +};
> +
>  static const struct i2c_device_id tas5720_id[] = {
> -	{ "tas5720", TAS5720 },
> -	{ "tas5722", TAS5722 },
> +	{ "tas5720", (kernel_ulong_t)&tas5720 },
> +	{ "tas5722", (kernel_ulong_t)&tas5722 },
>  	{ }
>  };
>  MODULE_DEVICE_TABLE(i2c, tas5720_id);
>  
>  #if IS_ENABLED(CONFIG_OF)
>  static const struct of_device_id tas5720_of_match[] = {
> -	{ .compatible = "ti,tas5720", },
> -	{ .compatible = "ti,tas5722", },
> +	{ .compatible = "ti,tas5720", .data = &tas5720, },
> +	{ .compatible = "ti,tas5722", .data = &tas5722, },
>  	{ },
>  };
>  MODULE_DEVICE_TABLE(of, tas5720_of_match);
>