cs4341.c

/* SPDX-License-Identifier: GPL-2.0+ */
/*
 *  Cirrus Logic CS4341A ALSA SoC Codec Driver
 *  Author: Alexander Shiyan <shc_work@mail.ru>
 */

#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/regmap.h>
#include <linux/spi/spi.h>

#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/tlv.h>

#define CS4341_REG_MODE1	0x00
#define CS4341_REG_MODE2	0x01
#define CS4341_REG_MIX		0x02
#define CS4341_REG_VOLA		0x03
#define CS4341_REG_VOLB		0x04

#define CS4341_MODE2_DIF	(7 << 4)
#define CS4341_MODE2_DIF_I2S_24	(0 << 4)
#define CS4341_MODE2_DIF_I2S_16	(1 << 4)
#define CS4341_MODE2_DIF_LJ_24	(2 << 4)
#define CS4341_MODE2_DIF_RJ_24	(3 << 4)
#define CS4341_MODE2_DIF_RJ_16	(5 << 4)
#define CS4341_VOLX_MUTE	(1 << 7)

struct cs4341_priv {
	unsigned int		fmt;
	struct regmap		*regmap;
	struct regmap_config	regcfg;
};

static const struct reg_default cs4341_reg_defaults[] = {
	{ CS4341_REG_MODE1,	0x00 },
	{ CS4341_REG_MODE2,	0x82 },
	{ CS4341_REG_MIX,	0x49 },
	{ CS4341_REG_VOLA,	0x80 },
	{ CS4341_REG_VOLB,	0x80 },
};

static int cs4341_set_fmt(struct snd_soc_dai *dai, unsigned int format)
{
	struct snd_soc_component *component = dai->component;
	struct cs4341_priv *cs4341 = snd_soc_component_get_drvdata(component);

	switch (format & SND_SOC_DAIFMT_MASTER_MASK) {
	case SND_SOC_DAIFMT_CBS_CFS:
		break;
	default:
		return -EINVAL;
	}

	switch (format & SND_SOC_DAIFMT_INV_MASK) {
	case SND_SOC_DAIFMT_NB_NF:
		break;
	default:
		return -EINVAL;
	}

	switch (format & SND_SOC_DAIFMT_FORMAT_MASK) {
	case SND_SOC_DAIFMT_I2S:
	case SND_SOC_DAIFMT_LEFT_J:
	case SND_SOC_DAIFMT_RIGHT_J:
		cs4341->fmt = format & SND_SOC_DAIFMT_FORMAT_MASK;
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

static int cs4341_hw_params(struct snd_pcm_substream *substream,
			    struct snd_pcm_hw_params *params,
			    struct snd_soc_dai *dai)
{
	struct snd_soc_component *component = dai->component;
	struct cs4341_priv *cs4341 = snd_soc_component_get_drvdata(component);
	unsigned int mode = 0;
	int b24 = 0;

	switch (params_format(params)) {
	case SNDRV_PCM_FORMAT_S24_LE:
		b24 = 1;
		break;
	case SNDRV_PCM_FORMAT_S16_LE:
		break;
	default:
		dev_err(component->dev, "Unsupported PCM format 0x%08x.\n",
			params_format(params));
		return -EINVAL;
	}

	switch (cs4341->fmt) {
	case SND_SOC_DAIFMT_I2S:
		mode = b24 ? CS4341_MODE2_DIF_I2S_24 : CS4341_MODE2_DIF_I2S_16;
		break;
	case SND_SOC_DAIFMT_LEFT_J:
		mode = CS4341_MODE2_DIF_LJ_24;
		break;
	case SND_SOC_DAIFMT_RIGHT_J:
		mode = b24 ? CS4341_MODE2_DIF_RJ_24 : CS4341_MODE2_DIF_RJ_16;
		break;
	default:
		dev_err(component->dev, "Unsupported DAI format 0x%08x.\n",
			cs4341->fmt);
		return -EINVAL;
	}

	return snd_soc_component_update_bits(component, CS4341_REG_MODE2,
					     CS4341_MODE2_DIF, mode);
}

static int cs4341_mute(struct snd_soc_dai *dai, int mute, int direction)
{
	struct snd_soc_component *component = dai->component;
	int ret;

	ret = snd_soc_component_update_bits(component, CS4341_REG_VOLA,
					    CS4341_VOLX_MUTE,
					    mute ? CS4341_VOLX_MUTE : 0);
	if (ret < 0)
		return ret;

	return snd_soc_component_update_bits(component, CS4341_REG_VOLB,
					     CS4341_VOLX_MUTE,
					     mute ? CS4341_VOLX_MUTE : 0);
}

static DECLARE_TLV_DB_SCALE(out_tlv, -9000, 100, 0);

static const char * const deemph[] = {
	"None", "44.1k", "48k", "32k",
};

static const struct soc_enum deemph_enum =
	SOC_ENUM_SINGLE(CS4341_REG_MODE2, 2, 4, deemph);

static const char * const srzc[] = {
	"Immediate", "Zero Cross", "Soft Ramp", "SR on ZC",
};

static const struct soc_enum srzc_enum =
	SOC_ENUM_SINGLE(CS4341_REG_MIX, 5, 4, srzc);


static const struct snd_soc_dapm_widget cs4341_dapm_widgets[] = {
	SND_SOC_DAPM_DAC("HiFi DAC", NULL, SND_SOC_NOPM, 0, 0),
	SND_SOC_DAPM_OUTPUT("OutA"),
	SND_SOC_DAPM_OUTPUT("OutB"),
};

static const struct snd_soc_dapm_route cs4341_routes[] = {
	{ "OutA", NULL, "HiFi DAC" },
	{ "OutB", NULL, "HiFi DAC" },
	{ "DAC Playback", NULL, "OutA" },
	{ "DAC Playback", NULL, "OutB" },
};

static const struct snd_kcontrol_new cs4341_controls[] = {
	SOC_DOUBLE_R_TLV("Master Playback Volume",
			 CS4341_REG_VOLA, CS4341_REG_VOLB, 0, 90, 1, out_tlv),
	SOC_ENUM("De-Emphasis Control", deemph_enum),
	SOC_ENUM("Soft Ramp Zero Cross Control", srzc_enum),
	SOC_SINGLE("Auto-Mute Switch", CS4341_REG_MODE2, 7, 1, 0),
	SOC_SINGLE("Popguard Transient Switch", CS4341_REG_MODE2, 1, 1, 0),
};

static const struct snd_soc_dai_ops cs4341_dai_ops = {
	.set_fmt	= cs4341_set_fmt,
	.hw_params	= cs4341_hw_params,
	.mute_stream	= cs4341_mute,
	.no_capture_mute = 1,
};

static struct snd_soc_dai_driver cs4341_dai = {
	.name			= "cs4341a-hifi",
	.playback		= {
		.stream_name	= "DAC Playback",
		.channels_min	= 1,
		.channels_max	= 2,
		.rates		= SNDRV_PCM_RATE_8000_96000,
		.formats	= SNDRV_PCM_FMTBIT_S16_LE |
				  SNDRV_PCM_FMTBIT_S24_LE,
	},
	.ops			= &cs4341_dai_ops,
	.symmetric_rates	= 1,
};

static const struct snd_soc_component_driver soc_component_cs4341 = {
	.controls		= cs4341_controls,
	.num_controls		= ARRAY_SIZE(cs4341_controls),
	.dapm_widgets		= cs4341_dapm_widgets,
	.num_dapm_widgets	= ARRAY_SIZE(cs4341_dapm_widgets),
	.dapm_routes		= cs4341_routes,
	.num_dapm_routes	= ARRAY_SIZE(cs4341_routes),
	.idle_bias_on		= 1,
	.use_pmdown_time	= 1,
	.endianness		= 1,
	.non_legacy_dai_naming	= 1,
};

static const struct of_device_id __maybe_unused cs4341_dt_ids[] = {
	{ .compatible = "cirrus,cs4341a", },
	{ }
};
MODULE_DEVICE_TABLE(of, cs4341_dt_ids);

static int cs4341_probe(struct device *dev)
{
	struct cs4341_priv *cs4341 = dev_get_drvdata(dev);
	int i;

	for (i = 0; i < ARRAY_SIZE(cs4341_reg_defaults); i++)
		regmap_write(cs4341->regmap, cs4341_reg_defaults[i].reg,
			     cs4341_reg_defaults[i].def);

	return devm_snd_soc_register_component(dev, &soc_component_cs4341,
					       &cs4341_dai, 1);
}

#if IS_ENABLED(CONFIG_I2C)
static int cs4341_i2c_probe(struct i2c_client *i2c,
			    const struct i2c_device_id *id)
{
	struct cs4341_priv *cs4341;

	cs4341 = devm_kzalloc(&i2c->dev, sizeof(*cs4341), GFP_KERNEL);
	if (!cs4341)
		return -ENOMEM;

	i2c_set_clientdata(i2c, cs4341);

	cs4341->regcfg.reg_bits		= 8;
	cs4341->regcfg.val_bits		= 8;
	cs4341->regcfg.max_register	= CS4341_REG_VOLB;
	cs4341->regcfg.cache_type	= REGCACHE_FLAT;
	cs4341->regcfg.reg_defaults	= cs4341_reg_defaults;
	cs4341->regcfg.num_reg_defaults	= ARRAY_SIZE(cs4341_reg_defaults);
	cs4341->regmap = devm_regmap_init_i2c(i2c, &cs4341->regcfg);
	if (IS_ERR(cs4341->regmap))
		return PTR_ERR(cs4341->regmap);

	return cs4341_probe(&i2c->dev);
}

static const struct i2c_device_id cs4341_i2c_id[] = {
	{ "cs4341", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, cs4341_i2c_id);

static struct i2c_driver cs4341_i2c_driver = {
	.driver = {
		.name = "cs4341-i2c",
		.of_match_table = of_match_ptr(cs4341_dt_ids),
	},
	.probe = cs4341_i2c_probe,
	.id_table = cs4341_i2c_id,
};
#endif

#if defined(CONFIG_SPI_MASTER)
static bool cs4341_reg_readable(struct device *dev, unsigned int reg)
{
	return false;
}

static int cs4341_spi_probe(struct spi_device *spi)
{
	struct cs4341_priv *cs4341;
	int ret;

	cs4341 = devm_kzalloc(&spi->dev, sizeof(*cs4341), GFP_KERNEL);
	if (!cs4341)
		return -ENOMEM;

	if (!spi->bits_per_word)
		spi->bits_per_word = 8;
	if (!spi->max_speed_hz)
		spi->max_speed_hz = 6000000;
	ret = spi_setup(spi);
	if (ret)
		return ret;

	spi_set_drvdata(spi, cs4341);

	cs4341->regcfg.reg_bits		= 16;
	cs4341->regcfg.val_bits		= 8;
	cs4341->regcfg.write_flag_mask	= 0x20;
	cs4341->regcfg.max_register	= CS4341_REG_VOLB;
	cs4341->regcfg.cache_type	= REGCACHE_FLAT;
	cs4341->regcfg.readable_reg	= cs4341_reg_readable;
	cs4341->regcfg.reg_defaults	= cs4341_reg_defaults;
	cs4341->regcfg.num_reg_defaults	= ARRAY_SIZE(cs4341_reg_defaults);
	cs4341->regmap = devm_regmap_init_spi(spi, &cs4341->regcfg);
	if (IS_ERR(cs4341->regmap))
		return PTR_ERR(cs4341->regmap);

	return cs4341_probe(&spi->dev);
}

static struct spi_driver cs4341_spi_driver = {
	.driver = {
		.name = "cs4341-spi",
		.of_match_table = of_match_ptr(cs4341_dt_ids),
	},
	.probe = cs4341_spi_probe,
};
#endif

static int __init cs4341_init(void)
{
	int ret = 0;

#if IS_ENABLED(CONFIG_I2C)
	ret = i2c_add_driver(&cs4341_i2c_driver);
	if (ret)
		return ret;
#endif
#if defined(CONFIG_SPI_MASTER)
	ret = spi_register_driver(&cs4341_spi_driver);
#endif

	return ret;
}
module_init(cs4341_init);

static void __exit cs4341_exit(void)
{
#if IS_ENABLED(CONFIG_I2C)
	i2c_del_driver(&cs4341_i2c_driver);
#endif
#if defined(CONFIG_SPI_MASTER)
	spi_unregister_driver(&cs4341_spi_driver);
#endif
}
module_exit(cs4341_exit);

MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");
MODULE_DESCRIPTION("Cirrus Logic CS4341 ALSA SoC Codec Driver");
MODULE_LICENSE("GPL");