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Subject[PATCH v2 1/2] ASoC: ak4118: Add support for AK4118 S/PDIF transceiver
Date
From: Adrien Charruel <adrien.charruel@devialet.com>

The AK4118A is a digital audio transceiver supporting 8 input channels
at 192kHz and with 24bits resolution.
It converts the S/PDIF signal to I2S format and is configurable over I2C.

This driver introduce a minimal support of the AK4118, like selecting the
input channel, reading input frequency and detecting some errors.

Datasheet is available here:
https://www.akm.com/akm/en/file/datasheet/AK4118AEQ.pdf

Signed-off-by: Adrien Charruel <adrien.charruel@devialet.com>
Signed-off-by: Clément Péron <peron.clem@gmail.com>
---

v2:
- request threaded_irq in driver probe
- change fs_enum from VALUE_SINGLE to VALUE_ENUM_SINGLE

sound/soc/codecs/Kconfig | 6 +
sound/soc/codecs/Makefile | 2 +
sound/soc/codecs/ak4118.c | 438 ++++++++++++++++++++++++++++++++++++++
3 files changed, 446 insertions(+)
create mode 100644 sound/soc/codecs/ak4118.c

diff --git a/sound/soc/codecs/Kconfig b/sound/soc/codecs/Kconfig
index 9cc4f1848c9b..62bdb7e333b8 100644
--- a/sound/soc/codecs/Kconfig
+++ b/sound/soc/codecs/Kconfig
@@ -35,6 +35,7 @@ config SND_SOC_ALL_CODECS
select SND_SOC_ADAU7002
select SND_SOC_ADS117X
select SND_SOC_AK4104 if SPI_MASTER
+ select SND_SOC_AK4118 if I2C
select SND_SOC_AK4458 if I2C
select SND_SOC_AK4535 if I2C
select SND_SOC_AK4554
@@ -392,6 +393,11 @@ config SND_SOC_AK4104
tristate "AKM AK4104 CODEC"
depends on SPI_MASTER

+config SND_SOC_AK4118
+ tristate "AKM AK4118 CODEC"
+ depends on I2C
+ select REGMAP_I2C
+
config SND_SOC_AK4458
tristate "AKM AK4458 CODEC"
depends on I2C
diff --git a/sound/soc/codecs/Makefile b/sound/soc/codecs/Makefile
index 8ffab8c8dbfa..66f55d185620 100644
--- a/sound/soc/codecs/Makefile
+++ b/sound/soc/codecs/Makefile
@@ -27,6 +27,7 @@ snd-soc-adav801-objs := adav801.o
snd-soc-adav803-objs := adav803.o
snd-soc-ads117x-objs := ads117x.o
snd-soc-ak4104-objs := ak4104.o
+snd-soc-ak4118-objs := ak4118.o
snd-soc-ak4458-objs := ak4458.o
snd-soc-ak4535-objs := ak4535.o
snd-soc-ak4554-objs := ak4554.o
@@ -290,6 +291,7 @@ obj-$(CONFIG_SND_SOC_ADAV801) += snd-soc-adav801.o
obj-$(CONFIG_SND_SOC_ADAV803) += snd-soc-adav803.o
obj-$(CONFIG_SND_SOC_ADS117X) += snd-soc-ads117x.o
obj-$(CONFIG_SND_SOC_AK4104) += snd-soc-ak4104.o
+obj-$(CONFIG_SND_SOC_AK4118) += snd-soc-ak4118.o
obj-$(CONFIG_SND_SOC_AK4458) += snd-soc-ak4458.o
obj-$(CONFIG_SND_SOC_AK4535) += snd-soc-ak4535.o
obj-$(CONFIG_SND_SOC_AK4554) += snd-soc-ak4554.o
diff --git a/sound/soc/codecs/ak4118.c b/sound/soc/codecs/ak4118.c
new file mode 100644
index 000000000000..238ab29f2bf4
--- /dev/null
+++ b/sound/soc/codecs/ak4118.c
@@ -0,0 +1,438 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * ak4118.c -- Asahi Kasei ALSA Soc Audio driver
+ *
+ * Copyright 2018 DEVIALET
+ */
+
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/of_gpio.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+
+#include <sound/asoundef.h>
+#include <sound/core.h>
+#include <sound/initval.h>
+#include <sound/soc.h>
+
+#define AK4118_REG_CLK_PWR_CTL 0x00
+#define AK4118_REG_FORMAT_CTL 0x01
+#define AK4118_REG_IO_CTL0 0x02
+#define AK4118_REG_IO_CTL1 0x03
+#define AK4118_REG_INT0_MASK 0x04
+#define AK4118_REG_INT1_MASK 0x05
+#define AK4118_REG_RCV_STATUS0 0x06
+#define AK4118_REG_RCV_STATUS1 0x07
+#define AK4118_REG_RXCHAN_STATUS0 0x08
+#define AK4118_REG_RXCHAN_STATUS1 0x09
+#define AK4118_REG_RXCHAN_STATUS2 0x0a
+#define AK4118_REG_RXCHAN_STATUS3 0x0b
+#define AK4118_REG_RXCHAN_STATUS4 0x0c
+#define AK4118_REG_TXCHAN_STATUS0 0x0d
+#define AK4118_REG_TXCHAN_STATUS1 0x0e
+#define AK4118_REG_TXCHAN_STATUS2 0x0f
+#define AK4118_REG_TXCHAN_STATUS3 0x10
+#define AK4118_REG_TXCHAN_STATUS4 0x11
+#define AK4118_REG_BURST_PREAMB_PC0 0x12
+#define AK4118_REG_BURST_PREAMB_PC1 0x13
+#define AK4118_REG_BURST_PREAMB_PD0 0x14
+#define AK4118_REG_BURST_PREAMB_PD1 0x15
+#define AK4118_REG_QSUB_CTL 0x16
+#define AK4118_REG_QSUB_TRACK 0x17
+#define AK4118_REG_QSUB_INDEX 0x18
+#define AK4118_REG_QSUB_MIN 0x19
+#define AK4118_REG_QSUB_SEC 0x1a
+#define AK4118_REG_QSUB_FRAME 0x1b
+#define AK4118_REG_QSUB_ZERO 0x1c
+#define AK4118_REG_QSUB_ABS_MIN 0x1d
+#define AK4118_REG_QSUB_ABS_SEC 0x1e
+#define AK4118_REG_QSUB_ABS_FRAME 0x1f
+#define AK4118_REG_GPE 0x20
+#define AK4118_REG_GPDR 0x21
+#define AK4118_REG_GPSCR 0x22
+#define AK4118_REG_GPLR 0x23
+#define AK4118_REG_DAT_MASK_DTS 0x24
+#define AK4118_REG_RX_DETECT 0x25
+#define AK4118_REG_STC_DAT_DETECT 0x26
+#define AK4118_REG_RXCHAN_STATUS5 0x27
+#define AK4118_REG_TXCHAN_STATUS5 0x28
+#define AK4118_REG_MAX 0x29
+
+#define AK4118_REG_FORMAT_CTL_DIF0 (1 << 4)
+#define AK4118_REG_FORMAT_CTL_DIF1 (1 << 5)
+#define AK4118_REG_FORMAT_CTL_DIF2 (1 << 6)
+
+struct ak4118_priv {
+ struct regmap *regmap;
+ struct gpio_desc *reset;
+ struct gpio_desc *irq;
+ struct snd_soc_component *component;
+};
+
+static const struct reg_default ak4118_reg_defaults[] = {
+ {AK4118_REG_CLK_PWR_CTL, 0x43},
+ {AK4118_REG_FORMAT_CTL, 0x6a},
+ {AK4118_REG_IO_CTL0, 0x88},
+ {AK4118_REG_IO_CTL1, 0x48},
+ {AK4118_REG_INT0_MASK, 0xee},
+ {AK4118_REG_INT1_MASK, 0xb5},
+ {AK4118_REG_RCV_STATUS0, 0x00},
+ {AK4118_REG_RCV_STATUS1, 0x10},
+ {AK4118_REG_TXCHAN_STATUS0, 0x00},
+ {AK4118_REG_TXCHAN_STATUS1, 0x00},
+ {AK4118_REG_TXCHAN_STATUS2, 0x00},
+ {AK4118_REG_TXCHAN_STATUS3, 0x00},
+ {AK4118_REG_TXCHAN_STATUS4, 0x00},
+ {AK4118_REG_GPE, 0x77},
+ {AK4118_REG_GPDR, 0x00},
+ {AK4118_REG_GPSCR, 0x00},
+ {AK4118_REG_GPLR, 0x00},
+ {AK4118_REG_DAT_MASK_DTS, 0x3f},
+ {AK4118_REG_RX_DETECT, 0x00},
+ {AK4118_REG_STC_DAT_DETECT, 0x00},
+ {AK4118_REG_TXCHAN_STATUS5, 0x00},
+};
+
+static const char * const ak4118_input_select_txt[] = {
+ "RX0", "RX1", "RX2", "RX3", "RX4", "RX5", "RX6", "RX7",
+};
+static SOC_ENUM_SINGLE_DECL(ak4118_insel_enum, AK4118_REG_IO_CTL1, 0x0,
+ ak4118_input_select_txt);
+
+static const struct snd_kcontrol_new ak4118_input_mux_controls =
+ SOC_DAPM_ENUM("Input Select", ak4118_insel_enum);
+
+static const char * const ak4118_iec958_fs_txt[] = {
+ "44100", "48000", "32000", "22050", "11025", "24000", "16000", "88200",
+ "8000", "96000", "64000", "176400", "192000",
+};
+
+static const int ak4118_iec958_fs_val[] = {
+ 0x0, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7, 0x8, 0x9, 0xA, 0xB, 0xC, 0xE,
+};
+
+static SOC_VALUE_ENUM_SINGLE_DECL(ak4118_iec958_fs_enum, AK4118_REG_RCV_STATUS1,
+ 0x4, 0x4, ak4118_iec958_fs_txt,
+ ak4118_iec958_fs_val);
+
+static struct snd_kcontrol_new ak4118_iec958_controls[] = {
+ SOC_SINGLE("IEC958 Parity Errors", AK4118_REG_RCV_STATUS0, 0, 1, 0),
+ SOC_SINGLE("IEC958 No Audio", AK4118_REG_RCV_STATUS0, 1, 1, 0),
+ SOC_SINGLE("IEC958 PLL Lock", AK4118_REG_RCV_STATUS0, 4, 1, 1),
+ SOC_SINGLE("IEC958 Non PCM", AK4118_REG_RCV_STATUS0, 6, 1, 0),
+ SOC_ENUM("IEC958 Sampling Freq", ak4118_iec958_fs_enum),
+};
+
+static const struct snd_soc_dapm_widget ak4118_dapm_widgets[] = {
+ SND_SOC_DAPM_INPUT("INRX0"),
+ SND_SOC_DAPM_INPUT("INRX1"),
+ SND_SOC_DAPM_INPUT("INRX2"),
+ SND_SOC_DAPM_INPUT("INRX3"),
+ SND_SOC_DAPM_INPUT("INRX4"),
+ SND_SOC_DAPM_INPUT("INRX5"),
+ SND_SOC_DAPM_INPUT("INRX6"),
+ SND_SOC_DAPM_INPUT("INRX7"),
+ SND_SOC_DAPM_MUX("Input Mux", SND_SOC_NOPM, 0, 0,
+ &ak4118_input_mux_controls),
+};
+
+static const struct snd_soc_dapm_route ak4118_dapm_routes[] = {
+ {"Input Mux", "RX0", "INRX0"},
+ {"Input Mux", "RX1", "INRX1"},
+ {"Input Mux", "RX2", "INRX2"},
+ {"Input Mux", "RX3", "INRX3"},
+ {"Input Mux", "RX4", "INRX4"},
+ {"Input Mux", "RX5", "INRX5"},
+ {"Input Mux", "RX6", "INRX6"},
+ {"Input Mux", "RX7", "INRX7"},
+};
+
+
+static int ak4118_set_dai_fmt_master(struct ak4118_priv *ak4118,
+ unsigned int format)
+{
+ int dif;
+
+ switch (format & SND_SOC_DAIFMT_FORMAT_MASK) {
+ case SND_SOC_DAIFMT_I2S:
+ dif = AK4118_REG_FORMAT_CTL_DIF0 | AK4118_REG_FORMAT_CTL_DIF2;
+ break;
+ case SND_SOC_DAIFMT_RIGHT_J:
+ dif = AK4118_REG_FORMAT_CTL_DIF0 | AK4118_REG_FORMAT_CTL_DIF1;
+ break;
+ case SND_SOC_DAIFMT_LEFT_J:
+ dif = AK4118_REG_FORMAT_CTL_DIF2;
+ break;
+ default:
+ return -ENOTSUPP;
+ }
+
+ return dif;
+}
+
+static int ak4118_set_dai_fmt_slave(struct ak4118_priv *ak4118,
+ unsigned int format)
+{
+ int dif;
+
+ switch (format & SND_SOC_DAIFMT_FORMAT_MASK) {
+ case SND_SOC_DAIFMT_I2S:
+ dif = AK4118_REG_FORMAT_CTL_DIF0 | AK4118_REG_FORMAT_CTL_DIF1 |
+ AK4118_REG_FORMAT_CTL_DIF2;
+ break;
+ case SND_SOC_DAIFMT_LEFT_J:
+ dif = AK4118_REG_FORMAT_CTL_DIF1 | AK4118_REG_FORMAT_CTL_DIF2;
+ break;
+ default:
+ return -ENOTSUPP;
+ }
+
+ return dif;
+}
+
+static int ak4118_set_dai_fmt(struct snd_soc_dai *dai,
+ unsigned int format)
+{
+ struct snd_soc_component *component = dai->component;
+ struct ak4118_priv *ak4118 = snd_soc_component_get_drvdata(component);
+ int dif;
+ int ret = 0;
+
+ switch (format & SND_SOC_DAIFMT_MASTER_MASK) {
+ case SND_SOC_DAIFMT_CBM_CFM:
+ /* component is master */
+ dif = ak4118_set_dai_fmt_master(ak4118, format);
+ break;
+ case SND_SOC_DAIFMT_CBS_CFS:
+ /*component is slave */
+ dif = ak4118_set_dai_fmt_slave(ak4118, format);
+ break;
+ default:
+ ret = -ENOTSUPP;
+ goto exit;
+ }
+
+ /* format not supported */
+ if (dif < 0) {
+ ret = dif;
+ goto exit;
+ }
+
+ ret = regmap_update_bits(ak4118->regmap, AK4118_REG_FORMAT_CTL,
+ AK4118_REG_FORMAT_CTL_DIF0 |
+ AK4118_REG_FORMAT_CTL_DIF1 |
+ AK4118_REG_FORMAT_CTL_DIF2, dif);
+ if (ret < 0)
+ goto exit;
+
+exit:
+ return ret;
+}
+
+static int ak4118_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params,
+ struct snd_soc_dai *dai)
+{
+ return 0;
+}
+
+static const struct snd_soc_dai_ops ak4118_dai_ops = {
+ .hw_params = ak4118_hw_params,
+ .set_fmt = ak4118_set_dai_fmt,
+};
+
+static struct snd_soc_dai_driver ak4118_dai = {
+ .name = "ak4118-hifi",
+ .capture = {
+ .stream_name = "Capture",
+ .channels_min = 2,
+ .channels_max = 2,
+ .rates = SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 |
+ SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 |
+ SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000 |
+ SNDRV_PCM_RATE_176400 | SNDRV_PCM_RATE_192000,
+ .formats = SNDRV_PCM_FMTBIT_S16_LE |
+ SNDRV_PCM_FMTBIT_S24_3LE |
+ SNDRV_PCM_FMTBIT_S24_LE
+ },
+ .ops = &ak4118_dai_ops,
+};
+
+static irqreturn_t ak4118_irq_handler(int irq, void *data)
+{
+ struct ak4118_priv *ak4118 = data;
+ struct snd_soc_component *component = ak4118->component;
+ struct snd_kcontrol_new *kctl_new;
+ struct snd_kcontrol *kctl;
+ struct snd_ctl_elem_id *id;
+ unsigned int i;
+
+ if (!component)
+ return IRQ_NONE;
+
+ for (i = 0; i < ARRAY_SIZE(ak4118_iec958_controls); i++) {
+ kctl_new = &ak4118_iec958_controls[i];
+ kctl = snd_soc_card_get_kcontrol(component->card,
+ kctl_new->name);
+ if (!kctl)
+ continue;
+ id = &kctl->id;
+ snd_ctl_notify(component->card->snd_card,
+ SNDRV_CTL_EVENT_MASK_VALUE, id);
+ }
+
+ return IRQ_HANDLED;
+}
+
+static int ak4118_probe(struct snd_soc_component *component)
+{
+ struct ak4118_priv *ak4118 = snd_soc_component_get_drvdata(component);
+ int ret = 0;
+
+ ak4118->component = component;
+
+ /* release reset */
+ gpiod_set_value(ak4118->reset, 0);
+
+ /* unmask all int1 sources */
+ ret = regmap_write(ak4118->regmap, AK4118_REG_INT1_MASK, 0x00);
+ if (ret < 0) {
+ dev_err(component->dev,
+ "failed to write regmap 0x%x 0x%x: %d\n",
+ AK4118_REG_INT1_MASK, 0x00, ret);
+ return ret;
+ }
+
+ /* rx detect enable on all channels */
+ ret = regmap_write(ak4118->regmap, AK4118_REG_RX_DETECT, 0xff);
+ if (ret < 0) {
+ dev_err(component->dev,
+ "failed to write regmap 0x%x 0x%x: %d\n",
+ AK4118_REG_RX_DETECT, 0xff, ret);
+ return ret;
+ }
+
+ ret = snd_soc_add_component_controls(component, ak4118_iec958_controls,
+ ARRAY_SIZE(ak4118_iec958_controls));
+ if (ret) {
+ dev_err(component->dev,
+ "failed to add component kcontrols: %d\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static void ak4118_remove(struct snd_soc_component *component)
+{
+ struct ak4118_priv *ak4118 = snd_soc_component_get_drvdata(component);
+
+ /* hold reset */
+ gpiod_set_value(ak4118->reset, 1);
+}
+
+static const struct snd_soc_component_driver soc_component_drv_ak4118 = {
+ .probe = ak4118_probe,
+ .remove = ak4118_remove,
+ .dapm_widgets = ak4118_dapm_widgets,
+ .num_dapm_widgets = ARRAY_SIZE(ak4118_dapm_widgets),
+ .dapm_routes = ak4118_dapm_routes,
+ .num_dapm_routes = ARRAY_SIZE(ak4118_dapm_routes),
+ .idle_bias_on = 1,
+ .use_pmdown_time = 1,
+ .endianness = 1,
+ .non_legacy_dai_naming = 1,
+};
+
+static const struct regmap_config ak4118_regmap = {
+ .reg_bits = 8,
+ .val_bits = 8,
+
+ .reg_defaults = ak4118_reg_defaults,
+ .num_reg_defaults = ARRAY_SIZE(ak4118_reg_defaults),
+
+ .cache_type = REGCACHE_NONE,
+ .max_register = AK4118_REG_MAX - 1,
+};
+
+static int ak4118_i2c_probe(struct i2c_client *i2c,
+ const struct i2c_device_id *id)
+{
+ struct ak4118_priv *ak4118;
+ int ret;
+
+ ak4118 = devm_kzalloc(&i2c->dev, sizeof(struct ak4118_priv),
+ GFP_KERNEL);
+ if (ak4118 == NULL)
+ return -ENOMEM;
+
+ ak4118->regmap = devm_regmap_init_i2c(i2c, &ak4118_regmap);
+ if (IS_ERR(ak4118->regmap))
+ return PTR_ERR(ak4118->regmap);
+
+ i2c_set_clientdata(i2c, ak4118);
+
+ ak4118->reset = devm_gpiod_get(&i2c->dev, "reset", GPIOD_OUT_HIGH);
+ if (IS_ERR(ak4118->reset)) {
+ ret = PTR_ERR(ak4118->reset);
+ if (ret != -EPROBE_DEFER)
+ dev_err(&i2c->dev, "Failed to get reset: %d\n", ret);
+ return ret;
+ }
+
+ ak4118->irq = devm_gpiod_get(&i2c->dev, "irq", GPIOD_IN);
+ if (IS_ERR(ak4118->irq)) {
+ ret = PTR_ERR(ak4118->irq);
+ if (ret != -EPROBE_DEFER)
+ dev_err(&i2c->dev, "Failed to get IRQ: %d\n", ret);
+ return ret;
+ }
+
+ ret = devm_request_threaded_irq(&i2c->dev, gpiod_to_irq(ak4118->irq),
+ NULL, ak4118_irq_handler,
+ IRQF_TRIGGER_RISING | IRQF_ONESHOT,
+ "ak4118-irq", ak4118);
+ if (ret < 0) {
+ dev_err(&i2c->dev, "Fail to request_irq: %d\n", ret);
+ return ret;
+ }
+
+ return snd_soc_register_component(&i2c->dev, &soc_component_drv_ak4118,
+ &ak4118_dai, 1);
+}
+
+static int ak4118_i2c_remove(struct i2c_client *i2c)
+{
+ snd_soc_unregister_component(&i2c->dev);
+ return 0;
+}
+
+static const struct of_device_id ak4118_of_match[] = {
+ { .compatible = "asahi-kasei,ak4118", },
+ {}
+};
+MODULE_DEVICE_TABLE(of, ak4118_of_match);
+
+static const struct i2c_device_id ak4118_id_table[] = {
+ { "ak4118", 0 },
+ {}
+};
+MODULE_DEVICE_TABLE(i2c, ak4118_id_table);
+
+static struct i2c_driver ak4118_i2c_driver = {
+ .driver = {
+ .name = "ak4118",
+ .of_match_table = of_match_ptr(ak4118_of_match),
+ },
+ .id_table = ak4118_id_table,
+ .probe = ak4118_i2c_probe,
+ .remove = ak4118_i2c_remove,
+};
+
+module_i2c_driver(ak4118_i2c_driver);
+
+MODULE_DESCRIPTION("Asahi Kasei AK4118 ALSA SoC driver");
+MODULE_AUTHOR("Adrien Charruel <adrien.charruel@devialet.com>");
+MODULE_LICENSE("GPL");
--
2.19.1
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