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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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      Last update: 2018-11-14 13:17    [W:3.120 / U:0.032 seconds]
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