[linux-2.6-block.git] / sound / soc / codecs / ak4104.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * AK4104 ALSA SoC (ASoC) driver
 *
 * Copyright (c) 2009 Daniel Mack <daniel@caiaq.de>
 */

#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/spi/spi.h>
#include <linux/gpio/consumer.h>
#include <linux/regulator/consumer.h>
#include <sound/asoundef.h>
#include <sound/core.h>
#include <sound/soc.h>
#include <sound/initval.h>

/* AK4104 registers addresses */
#define AK4104_REG_CONTROL1		0x00
#define AK4104_REG_RESERVED		0x01
#define AK4104_REG_CONTROL2		0x02
#define AK4104_REG_TX			0x03
#define AK4104_REG_CHN_STATUS(x)	((x) + 0x04)
#define AK4104_NUM_REGS			10

#define AK4104_REG_MASK			0x1f
#define AK4104_READ			0xc0
#define AK4104_WRITE			0xe0
#define AK4104_RESERVED_VAL		0x5b

/* Bit masks for AK4104 registers */
#define AK4104_CONTROL1_RSTN		(1 << 0)
#define AK4104_CONTROL1_PW		(1 << 1)
#define AK4104_CONTROL1_DIF0		(1 << 2)
#define AK4104_CONTROL1_DIF1		(1 << 3)

#define AK4104_CONTROL2_SEL0		(1 << 0)
#define AK4104_CONTROL2_SEL1		(1 << 1)
#define AK4104_CONTROL2_MODE		(1 << 2)

#define AK4104_TX_TXE			(1 << 0)
#define AK4104_TX_V			(1 << 1)

struct ak4104_private {
	struct regmap *regmap;
	struct regulator *regulator;
};

static const struct snd_soc_dapm_widget ak4104_dapm_widgets[] = {
SND_SOC_DAPM_PGA("TXE", AK4104_REG_TX, AK4104_TX_TXE, 0, NULL, 0),

SND_SOC_DAPM_OUTPUT("TX"),
};

static const struct snd_soc_dapm_route ak4104_dapm_routes[] = {
	{ "TXE", NULL, "Playback" },
	{ "TX", NULL, "TXE" },
};

static int ak4104_set_dai_fmt(struct snd_soc_dai *codec_dai,
			      unsigned int format)
{
	struct snd_soc_component *component = codec_dai->component;
	struct ak4104_private *ak4104 = snd_soc_component_get_drvdata(component);
	int val = 0;
	int ret;

	/* set DAI format */
	switch (format & SND_SOC_DAIFMT_FORMAT_MASK) {
	case SND_SOC_DAIFMT_RIGHT_J:
		break;
	case SND_SOC_DAIFMT_LEFT_J:
		val |= AK4104_CONTROL1_DIF0;
		break;
	case SND_SOC_DAIFMT_I2S:
		val |= AK4104_CONTROL1_DIF0 | AK4104_CONTROL1_DIF1;
		break;
	default:
		dev_err(component->dev, "invalid dai format\n");
		return -EINVAL;
	}

	/* This device can only be consumer */
	if ((format & SND_SOC_DAIFMT_CLOCK_PROVIDER_MASK) != SND_SOC_DAIFMT_CBC_CFC)
		return -EINVAL;

	ret = regmap_update_bits(ak4104->regmap, AK4104_REG_CONTROL1,
				 AK4104_CONTROL1_DIF0 | AK4104_CONTROL1_DIF1,
				 val);
	if (ret < 0)
		return ret;

	return 0;
}

static int ak4104_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 ak4104_private *ak4104 = snd_soc_component_get_drvdata(component);
	int ret, val = 0;

	/* set the IEC958 bits: consumer mode, no copyright bit */
	val |= IEC958_AES0_CON_NOT_COPYRIGHT;
	regmap_write(ak4104->regmap, AK4104_REG_CHN_STATUS(0), val);

	val = 0;

	switch (params_rate(params)) {
	case 22050:
		val |= IEC958_AES3_CON_FS_22050;
		break;
	case 24000:
		val |= IEC958_AES3_CON_FS_24000;
		break;
	case 32000:
		val |= IEC958_AES3_CON_FS_32000;
		break;
	case 44100:
		val |= IEC958_AES3_CON_FS_44100;
		break;
	case 48000:
		val |= IEC958_AES3_CON_FS_48000;
		break;
	case 88200:
		val |= IEC958_AES3_CON_FS_88200;
		break;
	case 96000:
		val |= IEC958_AES3_CON_FS_96000;
		break;
	case 176400:
		val |= IEC958_AES3_CON_FS_176400;
		break;
	case 192000:
		val |= IEC958_AES3_CON_FS_192000;
		break;
	default:
		dev_err(component->dev, "unsupported sampling rate\n");
		return -EINVAL;
	}

	ret = regmap_write(ak4104->regmap, AK4104_REG_CHN_STATUS(3), val);
	if (ret < 0)
		return ret;

	return 0;
}

static const struct snd_soc_dai_ops ak4101_dai_ops = {
	.hw_params = ak4104_hw_params,
	.set_fmt = ak4104_set_dai_fmt,
};

static struct snd_soc_dai_driver ak4104_dai = {
	.name = "ak4104-hifi",
	.playback = {
		.stream_name = "Playback",
		.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 = &ak4101_dai_ops,
};

static int ak4104_probe(struct snd_soc_component *component)
{
	struct ak4104_private *ak4104 = snd_soc_component_get_drvdata(component);
	int ret;

	ret = regulator_enable(ak4104->regulator);
	if (ret < 0) {
		dev_err(component->dev, "Unable to enable regulator: %d\n", ret);
		return ret;
	}

	/* set power-up and non-reset bits */
	ret = regmap_update_bits(ak4104->regmap, AK4104_REG_CONTROL1,
				 AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN,
				 AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN);
	if (ret < 0)
		goto exit_disable_regulator;

	/* enable transmitter */
	ret = regmap_update_bits(ak4104->regmap, AK4104_REG_TX,
				 AK4104_TX_TXE, AK4104_TX_TXE);
	if (ret < 0)
		goto exit_disable_regulator;

	return 0;

exit_disable_regulator:
	regulator_disable(ak4104->regulator);
	return ret;
}

static void ak4104_remove(struct snd_soc_component *component)
{
	struct ak4104_private *ak4104 = snd_soc_component_get_drvdata(component);

	regmap_update_bits(ak4104->regmap, AK4104_REG_CONTROL1,
			   AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN, 0);
	regulator_disable(ak4104->regulator);
}

#ifdef CONFIG_PM
static int ak4104_soc_suspend(struct snd_soc_component *component)
{
	struct ak4104_private *priv = snd_soc_component_get_drvdata(component);

	regulator_disable(priv->regulator);

	return 0;
}

static int ak4104_soc_resume(struct snd_soc_component *component)
{
	struct ak4104_private *priv = snd_soc_component_get_drvdata(component);
	int ret;

	ret = regulator_enable(priv->regulator);
	if (ret < 0)
		return ret;

	return 0;
}
#else
#define ak4104_soc_suspend	NULL
#define ak4104_soc_resume	NULL
#endif /* CONFIG_PM */

static const struct snd_soc_component_driver soc_component_device_ak4104 = {
	.probe			= ak4104_probe,
	.remove			= ak4104_remove,
	.suspend		= ak4104_soc_suspend,
	.resume			= ak4104_soc_resume,
	.dapm_widgets		= ak4104_dapm_widgets,
	.num_dapm_widgets	= ARRAY_SIZE(ak4104_dapm_widgets),
	.dapm_routes		= ak4104_dapm_routes,
	.num_dapm_routes	= ARRAY_SIZE(ak4104_dapm_routes),
	.idle_bias_on		= 1,
	.use_pmdown_time	= 1,
	.endianness		= 1,
};

static const struct regmap_config ak4104_regmap = {
	.reg_bits = 8,
	.val_bits = 8,

	.max_register = AK4104_NUM_REGS - 1,
	.read_flag_mask = AK4104_READ,
	.write_flag_mask = AK4104_WRITE,

	.cache_type = REGCACHE_RBTREE,
};

static int ak4104_spi_probe(struct spi_device *spi)
{
	struct ak4104_private *ak4104;
	struct gpio_desc *reset_gpiod;
	unsigned int val;
	int ret;

	spi->bits_per_word = 8;
	spi->mode = SPI_MODE_0;
	ret = spi_setup(spi);
	if (ret < 0)
		return ret;

	ak4104 = devm_kzalloc(&spi->dev, sizeof(struct ak4104_private),
			      GFP_KERNEL);
	if (ak4104 == NULL)
		return -ENOMEM;

	ak4104->regulator = devm_regulator_get(&spi->dev, "vdd");
	if (IS_ERR(ak4104->regulator)) {
		ret = PTR_ERR(ak4104->regulator);
		dev_err(&spi->dev, "Unable to get Vdd regulator: %d\n", ret);
		return ret;
	}

	ak4104->regmap = devm_regmap_init_spi(spi, &ak4104_regmap);
	if (IS_ERR(ak4104->regmap)) {
		ret = PTR_ERR(ak4104->regmap);
		return ret;
	}

	reset_gpiod = devm_gpiod_get_optional(&spi->dev, "reset",
					      GPIOD_OUT_HIGH);
	if (PTR_ERR(reset_gpiod) == -EPROBE_DEFER)
		return -EPROBE_DEFER;

	/* read the 'reserved' register - according to the datasheet, it
	 * should contain 0x5b. Not a good way to verify the presence of
	 * the device, but there is no hardware ID register. */
	ret = regmap_read(ak4104->regmap, AK4104_REG_RESERVED, &val);
	if (ret != 0)
		return ret;
	if (val != AK4104_RESERVED_VAL)
		return -ENODEV;

	spi_set_drvdata(spi, ak4104);

	ret = devm_snd_soc_register_component(&spi->dev,
			&soc_component_device_ak4104, &ak4104_dai, 1);
	return ret;
}

static const struct of_device_id ak4104_of_match[] = {
	{ .compatible = "asahi-kasei,ak4104", },
	{ }
};
MODULE_DEVICE_TABLE(of, ak4104_of_match);

static const struct spi_device_id ak4104_id_table[] = {
	{ "ak4104", 0 },
	{ }
};
MODULE_DEVICE_TABLE(spi, ak4104_id_table);

static struct spi_driver ak4104_spi_driver = {
	.driver  = {
		.name   = "ak4104",
		.of_match_table = ak4104_of_match,
	},
	.id_table = ak4104_id_table,
	.probe  = ak4104_spi_probe,
};

module_spi_driver(ak4104_spi_driver);

MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>");
MODULE_DESCRIPTION("Asahi Kasei AK4104 ALSA SoC driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
2874c5fd	1	// SPDX-License-Identifier: GPL-2.0-or-later
a381934e DM	2	/*
	3	* AK4104 ALSA SoC (ASoC) driver
	4	*
	5	* Copyright (c) 2009 Daniel Mack <daniel@caiaq.de>
a381934e DM	6	*/
a381934e DM	7
340d79a1	8	#include <linux/mod_devicetable.h>
a381934e	9	#include <linux/module.h>
5a0e3ad6	10	#include <linux/slab.h>
a381934e	11	#include <linux/spi/spi.h>
d8f2c859	12	#include <linux/gpio/consumer.h>
b38d10ed	13	#include <linux/regulator/consumer.h>
a381934e	14	#include <sound/asoundef.h>
b38d10ed DM	15	#include <sound/core.h>
	16	#include <sound/soc.h>
	17	#include <sound/initval.h>
a381934e	18
a381934e DM	19	/* AK4104 registers addresses */
	20	#define AK4104_REG_CONTROL1 0x00
	21	#define AK4104_REG_RESERVED 0x01
	22	#define AK4104_REG_CONTROL2 0x02
	23	#define AK4104_REG_TX 0x03
	24	#define AK4104_REG_CHN_STATUS(x) ((x) + 0x04)
	25	#define AK4104_NUM_REGS 10
	26
	27	#define AK4104_REG_MASK 0x1f
	28	#define AK4104_READ 0xc0
	29	#define AK4104_WRITE 0xe0
	30	#define AK4104_RESERVED_VAL 0x5b
	31
	32	/* Bit masks for AK4104 registers */
	33	#define AK4104_CONTROL1_RSTN (1 << 0)
	34	#define AK4104_CONTROL1_PW (1 << 1)
	35	#define AK4104_CONTROL1_DIF0 (1 << 2)
	36	#define AK4104_CONTROL1_DIF1 (1 << 3)
	37
	38	#define AK4104_CONTROL2_SEL0 (1 << 0)
	39	#define AK4104_CONTROL2_SEL1 (1 << 1)
	40	#define AK4104_CONTROL2_MODE (1 << 2)
	41
	42	#define AK4104_TX_TXE (1 << 0)
	43	#define AK4104_TX_V (1 << 1)
	44
a381934e	45	struct ak4104_private {
2901d6eb	46	struct regmap *regmap;
b38d10ed	47	struct regulator *regulator;
a381934e DM	48	};
a381934e DM	49
2e61926c	50	static const struct snd_soc_dapm_widget ak4104_dapm_widgets[] = {
a5db4d50 MB	51	SND_SOC_DAPM_PGA("TXE", AK4104_REG_TX, AK4104_TX_TXE, 0, NULL, 0),
a5db4d50 MB	52
2e61926c MB	53	SND_SOC_DAPM_OUTPUT("TX"),
	54	};
	55
	56	static const struct snd_soc_dapm_route ak4104_dapm_routes[] = {
a5db4d50 MB	57	{ "TXE", NULL, "Playback" },
a5db4d50 MB	58	{ "TX", NULL, "TXE" },
2e61926c MB	59	};
2e61926c MB	60
a381934e DM	61	static int ak4104_set_dai_fmt(struct snd_soc_dai *codec_dai,
	62	unsigned int format)
	63	{
61feead8 KM	64	struct snd_soc_component *component = codec_dai->component;
61feead8 KM	65	struct ak4104_private *ak4104 = snd_soc_component_get_drvdata(component);
a381934e	66	int val = 0;
2901d6eb	67	int ret;
a381934e	68
a381934e DM	69	/* set DAI format */
	70	switch (format & SND_SOC_DAIFMT_FORMAT_MASK) {
	71	case SND_SOC_DAIFMT_RIGHT_J:
	72	break;
	73	case SND_SOC_DAIFMT_LEFT_J:
	74	val \|= AK4104_CONTROL1_DIF0;
	75	break;
	76	case SND_SOC_DAIFMT_I2S:
	77	val \|= AK4104_CONTROL1_DIF0 \| AK4104_CONTROL1_DIF1;
	78	break;
	79	default:
61feead8	80	dev_err(component->dev, "invalid dai format\n");
a381934e DM	81	return -EINVAL;
	82	}
	83
8515f828 MB	84	/* This device can only be consumer */
8515f828 MB	85	if ((format & SND_SOC_DAIFMT_CLOCK_PROVIDER_MASK) != SND_SOC_DAIFMT_CBC_CFC)
a381934e DM	86	return -EINVAL;
a381934e DM	87
b0ec761b DM	88	ret = regmap_update_bits(ak4104->regmap, AK4104_REG_CONTROL1,
	89	AK4104_CONTROL1_DIF0 \| AK4104_CONTROL1_DIF1,
	90	val);
afad95f8 MB	91	if (ret < 0)
	92	return ret;
	93
	94	return 0;
a381934e DM	95	}
	96
	97	static int ak4104_hw_params(struct snd_pcm_substream *substream,
	98	struct snd_pcm_hw_params *params,
	99	struct snd_soc_dai *dai)
	100	{
61feead8 KM	101	struct snd_soc_component *component = dai->component;
61feead8 KM	102	struct ak4104_private *ak4104 = snd_soc_component_get_drvdata(component);
b692a436	103	int ret, val = 0;
a381934e DM	104
	105	/* set the IEC958 bits: consumer mode, no copyright bit */
	106	val \|= IEC958_AES0_CON_NOT_COPYRIGHT;
b0ec761b	107	regmap_write(ak4104->regmap, AK4104_REG_CHN_STATUS(0), val);
a381934e DM	108
	109	val = 0;
	110
	111	switch (params_rate(params)) {
08201deb DM	112	case 22050:
	113	val \|= IEC958_AES3_CON_FS_22050;
	114	break;
	115	case 24000:
	116	val \|= IEC958_AES3_CON_FS_24000;
	117	break;
	118	case 32000:
	119	val \|= IEC958_AES3_CON_FS_32000;
	120	break;
a381934e DM	121	case 44100:
	122	val \|= IEC958_AES3_CON_FS_44100;
	123	break;
	124	case 48000:
	125	val \|= IEC958_AES3_CON_FS_48000;
	126	break;
08201deb DM	127	case 88200:
	128	val \|= IEC958_AES3_CON_FS_88200;
	129	break;
	130	case 96000:
	131	val \|= IEC958_AES3_CON_FS_96000;
	132	break;
	133	case 176400:
	134	val \|= IEC958_AES3_CON_FS_176400;
	135	break;
	136	case 192000:
	137	val \|= IEC958_AES3_CON_FS_192000;
a381934e DM	138	break;
a381934e DM	139	default:
61feead8	140	dev_err(component->dev, "unsupported sampling rate\n");
a381934e DM	141	return -EINVAL;
	142	}
	143
b692a436 DM	144	ret = regmap_write(ak4104->regmap, AK4104_REG_CHN_STATUS(3), val);
	145	if (ret < 0)
	146	return ret;
	147
b692a436 DM	148	return 0;
	149	}
	150
85e7652d	151	static const struct snd_soc_dai_ops ak4101_dai_ops = {
65ec1cd1 MB	152	.hw_params = ak4104_hw_params,
	153	.set_fmt = ak4104_set_dai_fmt,
	154	};
	155
f0fba2ad LG	156	static struct snd_soc_dai_driver ak4104_dai = {
f0fba2ad LG	157	.name = "ak4104-hifi",
a381934e DM	158	.playback = {
	159	.stream_name = "Playback",
	160	.channels_min = 2,
	161	.channels_max = 2,
c14c59f2 VT	162	.rates = SNDRV_PCM_RATE_22050 \| SNDRV_PCM_RATE_32000 \|
	163	SNDRV_PCM_RATE_44100 \| SNDRV_PCM_RATE_48000 \|
	164	SNDRV_PCM_RATE_88200 \| SNDRV_PCM_RATE_96000 \|
	165	SNDRV_PCM_RATE_176400 \| SNDRV_PCM_RATE_192000,
a381934e DM	166	.formats = SNDRV_PCM_FMTBIT_S16_LE \|
	167	SNDRV_PCM_FMTBIT_S24_3LE \|
	168	SNDRV_PCM_FMTBIT_S24_LE
	169	},
65ec1cd1	170	.ops = &ak4101_dai_ops,
a381934e DM	171	};
a381934e DM	172
61feead8	173	static int ak4104_probe(struct snd_soc_component *component)
a381934e	174	{
61feead8	175	struct ak4104_private *ak4104 = snd_soc_component_get_drvdata(component);
2901d6eb	176	int ret;
a381934e	177
b38d10ed DM	178	ret = regulator_enable(ak4104->regulator);
b38d10ed DM	179	if (ret < 0) {
61feead8	180	dev_err(component->dev, "Unable to enable regulator: %d\n", ret);
b38d10ed DM	181	return ret;
	182	}
	183
a381934e	184	/* set power-up and non-reset bits */
b0ec761b DM	185	ret = regmap_update_bits(ak4104->regmap, AK4104_REG_CONTROL1,
	186	AK4104_CONTROL1_PW \| AK4104_CONTROL1_RSTN,
	187	AK4104_CONTROL1_PW \| AK4104_CONTROL1_RSTN);
a381934e	188	if (ret < 0)
b38d10ed	189	goto exit_disable_regulator;
a381934e DM	190
a381934e DM	191	/* enable transmitter */
b0ec761b DM	192	ret = regmap_update_bits(ak4104->regmap, AK4104_REG_TX,
b0ec761b DM	193	AK4104_TX_TXE, AK4104_TX_TXE);
a381934e	194	if (ret < 0)
b38d10ed	195	goto exit_disable_regulator;
a381934e	196
a381934e	197	return 0;
b38d10ed DM	198
	199	exit_disable_regulator:
	200	regulator_disable(ak4104->regulator);
	201	return ret;
a381934e DM	202	}
a381934e DM	203
61feead8	204	static void ak4104_remove(struct snd_soc_component *component)
a381934e	205	{
61feead8	206	struct ak4104_private *ak4104 = snd_soc_component_get_drvdata(component);
b0ec761b DM	207
	208	regmap_update_bits(ak4104->regmap, AK4104_REG_CONTROL1,
	209	AK4104_CONTROL1_PW \| AK4104_CONTROL1_RSTN, 0);
b38d10ed	210	regulator_disable(ak4104->regulator);
b38d10ed DM	211	}
	212
	213	#ifdef CONFIG_PM
61feead8	214	static int ak4104_soc_suspend(struct snd_soc_component *component)
b38d10ed	215	{
61feead8	216	struct ak4104_private *priv = snd_soc_component_get_drvdata(component);
b38d10ed DM	217
b38d10ed DM	218	regulator_disable(priv->regulator);
a381934e	219
afad95f8	220	return 0;
a381934e DM	221	}
a381934e DM	222
61feead8	223	static int ak4104_soc_resume(struct snd_soc_component *component)
b38d10ed	224	{
61feead8	225	struct ak4104_private *priv = snd_soc_component_get_drvdata(component);
b38d10ed DM	226	int ret;
	227
	228	ret = regulator_enable(priv->regulator);
	229	if (ret < 0)
	230	return ret;
	231
	232	return 0;
	233	}
	234	#else
	235	#define ak4104_soc_suspend NULL
	236	#define ak4104_soc_resume NULL
	237	#endif /* CONFIG_PM */
	238
61feead8 KM	239	static const struct snd_soc_component_driver soc_component_device_ak4104 = {
	240	.probe = ak4104_probe,
	241	.remove = ak4104_remove,
	242	.suspend = ak4104_soc_suspend,
	243	.resume = ak4104_soc_resume,
	244	.dapm_widgets = ak4104_dapm_widgets,
	245	.num_dapm_widgets = ARRAY_SIZE(ak4104_dapm_widgets),
	246	.dapm_routes = ak4104_dapm_routes,
	247	.num_dapm_routes = ARRAY_SIZE(ak4104_dapm_routes),
	248	.idle_bias_on = 1,
	249	.use_pmdown_time = 1,
	250	.endianness = 1,
2901d6eb MB	251	};
	252
	253	static const struct regmap_config ak4104_regmap = {
	254	.reg_bits = 8,
	255	.val_bits = 8,
	256
	257	.max_register = AK4104_NUM_REGS - 1,
	258	.read_flag_mask = AK4104_READ,
	259	.write_flag_mask = AK4104_WRITE,
	260
	261	.cache_type = REGCACHE_RBTREE,
f0fba2ad LG	262	};
	263
	264	static int ak4104_spi_probe(struct spi_device *spi)
a381934e	265	{
f0fba2ad	266	struct ak4104_private *ak4104;
d8f2c859	267	struct gpio_desc *reset_gpiod;
2901d6eb	268	unsigned int val;
a381934e DM	269	int ret;
a381934e DM	270
f0fba2ad LG	271	spi->bits_per_word = 8;
	272	spi->mode = SPI_MODE_0;
	273	ret = spi_setup(spi);
	274	if (ret < 0)
a381934e	275	return ret;
a381934e	276
3922d518 AL	277	ak4104 = devm_kzalloc(&spi->dev, sizeof(struct ak4104_private),
3922d518 AL	278	GFP_KERNEL);
f0fba2ad LG	279	if (ak4104 == NULL)
	280	return -ENOMEM;
	281
b38d10ed DM	282	ak4104->regulator = devm_regulator_get(&spi->dev, "vdd");
	283	if (IS_ERR(ak4104->regulator)) {
	284	ret = PTR_ERR(ak4104->regulator);
	285	dev_err(&spi->dev, "Unable to get Vdd regulator: %d\n", ret);
	286	return ret;
	287	}
	288
a273cd13	289	ak4104->regmap = devm_regmap_init_spi(spi, &ak4104_regmap);
2901d6eb MB	290	if (IS_ERR(ak4104->regmap)) {
	291	ret = PTR_ERR(ak4104->regmap);
	292	return ret;
	293	}
	294
d8f2c859 DM	295	reset_gpiod = devm_gpiod_get_optional(&spi->dev, "reset",
d8f2c859 DM	296	GPIOD_OUT_HIGH);
45586c70	297	if (PTR_ERR(reset_gpiod) == -EPROBE_DEFER)
d8f2c859	298	return -EPROBE_DEFER;
385a4c2e	299
2901d6eb MB	300	/* read the 'reserved' register - according to the datasheet, it
	301	* should contain 0x5b. Not a good way to verify the presence of
	302	* the device, but there is no hardware ID register. */
	303	ret = regmap_read(ak4104->regmap, AK4104_REG_RESERVED, &val);
	304	if (ret != 0)
a273cd13 TB	305	return ret;
	306	if (val != AK4104_RESERVED_VAL)
	307	return -ENODEV;
2901d6eb	308
f0fba2ad LG	309	spi_set_drvdata(spi, ak4104);
f0fba2ad LG	310
61feead8 KM	311	ret = devm_snd_soc_register_component(&spi->dev,
61feead8 KM	312	&soc_component_device_ak4104, &ak4104_dai, 1);
f0fba2ad	313	return ret;
a381934e DM	314	}
a381934e DM	315
ac5dbea0 DM	316	static const struct of_device_id ak4104_of_match[] = {
	317	{ .compatible = "asahi-kasei,ak4104", },
	318	{ }
	319	};
	320	MODULE_DEVICE_TABLE(of, ak4104_of_match);
	321
193b2f65 DM	322	static const struct spi_device_id ak4104_id_table[] = {
	323	{ "ak4104", 0 },
	324	{ }
	325	};
	326	MODULE_DEVICE_TABLE(spi, ak4104_id_table);
	327
a381934e DM	328	static struct spi_driver ak4104_spi_driver = {
a381934e DM	329	.driver = {
193b2f65	330	.name = "ak4104",
ac5dbea0	331	.of_match_table = ak4104_of_match,
a381934e	332	},
193b2f65	333	.id_table = ak4104_id_table,
a381934e	334	.probe = ak4104_spi_probe,
a381934e DM	335	};
a381934e DM	336
38d78baf	337	module_spi_driver(ak4104_spi_driver);
a381934e DM	338
	339	MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>");
	340	MODULE_DESCRIPTION("Asahi Kasei AK4104 ALSA SoC driver");
	341	MODULE_LICENSE("GPL");
	342