ASoC: cs4341: Add driver for CS4341 DAC

This patch adds Cirrus Logic CS4341.
This is a very simple, playback only, stereo DAC.

Signed-off-by: Alexander Shiyan <shc_work@mail.ru>
Signed-off-by: Mark Brown <broonie@kernel.org>

3 files changed, 355 insertions, 0 deletions

diff --git a/sound/soc/codecs/Kconfig b/sound/soc/codecs/Kconfig
index 62bdb7e333b8..3f742753abd1 100644
--- a/sound/soc/codecs/Kconfig
+++ b/sound/soc/codecs/Kconfig
@@ -65,6 +65,7 @@ config SND_SOC_ALL_CODECS
 	select SND_SOC_CS4271_SPI if SPI_MASTER
 	select SND_SOC_CS42XX8_I2C if I2C
 	select SND_SOC_CS43130 if I2C
+	select SND_SOC_CS4341 if SND_SOC_I2C_AND_SPI
 	select SND_SOC_CS4349 if I2C
 	select SND_SOC_CS47L24 if MFD_CS47L24
 	select SND_SOC_CS53L30 if I2C
@@ -542,6 +543,12 @@ config SND_SOC_CS43130
         tristate "Cirrus Logic CS43130 CODEC"
         depends on I2C
 
+config SND_SOC_CS4341
+	tristate "Cirrus Logic CS4341 CODEC"
+	depends on I2C || SPI_MASTER
+	select REGMAP_I2C if I2C
+	select REGMAP_SPI if SPI_MASTER
+
 # Cirrus Logic CS4349 HiFi DAC
 config SND_SOC_CS4349
 	tristate "Cirrus Logic CS4349 CODEC"
diff --git a/sound/soc/codecs/Makefile b/sound/soc/codecs/Makefile
index 66f55d185620..fbe36e6177b0 100644
--- a/sound/soc/codecs/Makefile
+++ b/sound/soc/codecs/Makefile
@@ -60,6 +60,7 @@ snd-soc-cs4271-spi-objs := cs4271-spi.o
 snd-soc-cs42xx8-objs := cs42xx8.o
 snd-soc-cs42xx8-i2c-objs := cs42xx8-i2c.o
 snd-soc-cs43130-objs := cs43130.o
+snd-soc-cs4341-objs := cs4341.o
 snd-soc-cs4349-objs := cs4349.o
 snd-soc-cs47l24-objs := cs47l24.o
 snd-soc-cs53l30-objs := cs53l30.o
@@ -326,6 +327,7 @@ obj-$(CONFIG_SND_SOC_CS4271_SPI)	+= snd-soc-cs4271-spi.o
 obj-$(CONFIG_SND_SOC_CS42XX8)	+= snd-soc-cs42xx8.o
 obj-$(CONFIG_SND_SOC_CS42XX8_I2C) += snd-soc-cs42xx8-i2c.o
 obj-$(CONFIG_SND_SOC_CS43130)   += snd-soc-cs43130.o
+obj-$(CONFIG_SND_SOC_CS4341)	+= snd-soc-cs4341.o
 obj-$(CONFIG_SND_SOC_CS4349)	+= snd-soc-cs4349.o
 obj-$(CONFIG_SND_SOC_CS47L24)	+= snd-soc-cs47l24.o
 obj-$(CONFIG_SND_SOC_CS53L30)	+= snd-soc-cs53l30.o
diff --git a/sound/soc/codecs/cs4341.c b/sound/soc/codecs/cs4341.c
new file mode 100644
index 000000000000..d2e616a89fd4
--- /dev/null
+++ b/sound/soc/codecs/cs4341.c
@@ -0,0 +1,346 @@
+/* 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_digital_mute(struct snd_soc_dai *dai, int mute)
+{
+	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,
+	.digital_mute	= cs4341_digital_mute,
+};
+
+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 defined(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 defined(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 defined(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");