Unverified Commit 416e3bd3 authored by Mark Brown's avatar Mark Brown
Browse files

ASoC: Add Richtek rt9123 and rt9123p support 

Merge series from cy_huang@richtek.com:

This patch series adds Richtek rt9123 and rt9123p support.
It's a 3.2W mono Class-D audio amplifier.
parents 4aa502d2 38c2585c

Documentation/devicetree/bindings/sound/richtek,rt9123.yaml

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# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause

%YAML 1.2

---

$id: http://devicetree.org/schemas/sound/richtek,rt9123.yaml#

$schema: http://devicetree.org/meta-schemas/core.yaml#



title: Richtek RT9123 Audio Amplifier



maintainers:

  - ChiYuan Huang <cy_huang@richtek.com>



description:

  RT9123 is a 3.2W mono Class-D audio amplifier that features high efficiency

  and performance with ultra-low quiescent current. The digital audio interface

  support various formats, including I2S, left-justified, right-justified, and

  TDM formats.



allOf:

  - $ref: dai-common.yaml#



properties:

  compatible:

    enum:

      - richtek,rt9123



  reg:

    maxItems: 1



  '#sound-dai-cells':

    const: 0



  enable-gpios:

    maxItems: 1



required:

  - compatible

  - reg

  - '#sound-dai-cells'



unevaluatedProperties: false



examples:

  - |

    #include <dt-bindings/gpio/gpio.h>



    i2c {

        #address-cells = <1>;

        #size-cells = <0>;



        amplifier@5e {

            compatible = "richtek,rt9123";

            reg = <0x5e>;

            enable-gpios = <&gpio 26 GPIO_ACTIVE_HIGH>;

            #sound-dai-cells = <0>;

        };

    };

Documentation/devicetree/bindings/sound/richtek,rt9123p.yaml

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# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause

%YAML 1.2

---

$id: http://devicetree.org/schemas/sound/richtek,rt9123p.yaml#

$schema: http://devicetree.org/meta-schemas/core.yaml#



title: Richtek RT9123P Audio Amplifier



maintainers:

  - ChiYuan Huang <cy_huang@richtek.com>



description:

  RT9123P is a RT9123 variant which does not support I2C control.



allOf:

  - $ref: dai-common.yaml#



properties:

  compatible:

    enum:

      - richtek,rt9123p



  '#sound-dai-cells':

    const: 0



  enable-gpios:

    maxItems: 1



  enable-delay-ms:

    description:

      Delay time for 'ENABLE' pin changes intended to make I2S clocks ready to

      prevent speaker pop noise. The unit is in millisecond.



required:

  - compatible

  - '#sound-dai-cells'



unevaluatedProperties: false



examples:

  - |

    #include <dt-bindings/gpio/gpio.h>



    amplifier {

        compatible = "richtek,rt9123p";

        enable-gpios = <&gpio 26 GPIO_ACTIVE_HIGH>;

        #sound-dai-cells = <0>;

    };

sound/soc/codecs/Kconfig

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@@ -234,6 +234,7 @@ config SND_SOC_ALL_CODECS 
	imply SND_SOC_RT1318_SDW

	imply SND_SOC_RT1320_SDW

	imply SND_SOC_RT9120

	imply SND_SOC_RT9123

	imply SND_SOC_RTQ9128

	imply SND_SOC_SDW_MOCKUP

	imply SND_SOC_SGTL5000
@@ -1823,6 +1824,20 @@ config SND_SOC_RT9120 
	  Enable support for Richtek RT9120 20W, stereo, inductor-less,

	  high-efficiency Class-D audio amplifier.



config SND_SOC_RT9123

	tristate "Richtek RT9123 Mono Class-D Amplifier"

	depends on I2C

	select REGMAP_I2C

	help

	  Enable support for the I2C control mode of Richtek RT9123 3.2W mono

	  Class-D audio amplifier.



config SND_SOC_RT9123P

	tristate "Richtek RT9123P Mono Class-D Amplifier"

	help

	  Enable support for the HW control mode of Richtek RT9123P 3.2W mono

	  Class-D audio amplifier.



config SND_SOC_RTQ9128

	tristate "Richtek RTQ9128 45W Digital Input Amplifier"

	depends on I2C

sound/soc/codecs/Makefile

+4 −0
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@@ -270,6 +270,8 @@ snd-soc-rt715-sdca-y := rt715-sdca.o rt715-sdca-sdw.o 
snd-soc-rt721-sdca-y := rt721-sdca.o rt721-sdca-sdw.o

snd-soc-rt722-sdca-y := rt722-sdca.o rt722-sdca-sdw.o

snd-soc-rt9120-y := rt9120.o

snd-soc-rt9123-y := rt9123.o

snd-soc-rt9123p-y := rt9123p.o

snd-soc-rtq9128-y := rtq9128.o

snd-soc-sdw-mockup-y := sdw-mockup.o

snd-soc-sgtl5000-y := sgtl5000.o
@@ -684,6 +686,8 @@ obj-$(CONFIG_SND_SOC_RT715_SDCA_SDW) += snd-soc-rt715-sdca.o 
obj-$(CONFIG_SND_SOC_RT721_SDCA_SDW)     += snd-soc-rt721-sdca.o

obj-$(CONFIG_SND_SOC_RT722_SDCA_SDW)     += snd-soc-rt722-sdca.o

obj-$(CONFIG_SND_SOC_RT9120)	+= snd-soc-rt9120.o

obj-$(CONFIG_SND_SOC_RT9123)	+= snd-soc-rt9123.o

obj-$(CONFIG_SND_SOC_RT9123P)	+= snd-soc-rt9123p.o

obj-$(CONFIG_SND_SOC_RTQ9128)	+= snd-soc-rtq9128.o

obj-$(CONFIG_SND_SOC_SDW_MOCKUP)     += snd-soc-sdw-mockup.o

obj-$(CONFIG_SND_SOC_SGTL5000)  += snd-soc-sgtl5000.o

sound/soc/codecs/rt9123.c

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// SPDX-License-Identifier: GPL-2.0-only

//

// rt9123.c -- RT9123 (SW I2C Mode) ALSA SoC Codec driver

//

// Author: ChiYuan Huang <cy_huang@richtek.com>



#include <linux/acpi.h>

#include <linux/bitfield.h>

#include <linux/bits.h>

#include <linux/byteorder/generic.h>

#include <linux/delay.h>

#include <linux/err.h>

#include <linux/gpio/consumer.h>

#include <linux/i2c.h>

#include <linux/kernel.h>

#include <linux/mod_devicetable.h>

#include <linux/module.h>

#include <linux/of.h>

#include <linux/pm_runtime.h>

#include <linux/property.h>

#include <linux/regmap.h>

#include <sound/pcm.h>

#include <sound/pcm_params.h>

#include <sound/soc.h>

#include <sound/soc-dai.h>

#include <sound/soc-dapm.h>

#include <sound/tlv.h>



#define RT9123_REG_AMPCTRL	0x01

#define RT9123_REG_I2SOPT	0x02

#define RT9123_REG_TDMRX	0x03

#define RT9123_REG_SILVOLEN	0x04

#define RT9123_REG_VOLGAIN	0x12

#define RT9123_REG_ANAFLAG	0x36

#define RT9123_REG_COMBOID	0xF7



#define RT9123_MASK_SWRST	BIT(15)

#define RT9123_MASK_SWMUTE	BIT(14)

#define RT9123_MASK_AMPON	BIT(12)

#define RT9123_MASK_AUDBIT	GENMASK(14, 12)

#define RT9123_MASK_AUDFMT	GENMASK(11, 8)

#define RT9123_MASK_TDMRXLOC	GENMASK(4, 0)

#define RT9123_MASK_VENID	GENMASK(15, 4)



#define RT9123_FIXED_VENID	0x340



struct rt9123_priv {

	struct gpio_desc *enable;

	unsigned int dai_fmt;

	int tdm_slots;

	int tdm_slot_width;

};



static int rt9123_enable_event(struct snd_soc_dapm_widget *w, struct snd_kcontrol *kcontrol,

			       int event)

{

	struct snd_soc_component *comp = snd_soc_dapm_to_component(w->dapm);

	struct device *dev = comp->dev;

	unsigned int enable;

	int ret;



	switch (event) {

	case SND_SOC_DAPM_POST_PMU:

		enable = 1;

		break;

	case SND_SOC_DAPM_POST_PMD:

		enable = 0;

		break;

	default:

		return -EINVAL;

	}



	ret = pm_runtime_resume_and_get(dev);

	if (ret)

		return ret;



	/* AMPON bit is located in volatile RG, use pm_runtime to guarantee the RG access */

	snd_soc_component_write_field(comp, RT9123_REG_AMPCTRL, RT9123_MASK_AMPON, enable);



	pm_runtime_mark_last_busy(dev);

	pm_runtime_put_autosuspend(dev);



	return 0;

}



static const struct snd_soc_dapm_widget rt9123_dapm_widgets[] = {

	SND_SOC_DAPM_OUTPUT("SPK"),

	SND_SOC_DAPM_OUT_DRV_E("Amp Drv", SND_SOC_NOPM, 0, 0, NULL, 0, rt9123_enable_event,

			       SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_POST_PMD),

};



static const struct snd_soc_dapm_route rt9123_dapm_routes[] = {

	{ "Amp Drv", NULL, "HiFi Playback" },

	{ "SPK", NULL, "Amp Drv" },

};



static const DECLARE_TLV_DB_SCALE(dig_tlv, -10375, 25, 0);

static const DECLARE_TLV_DB_RANGE(ana_tlv,

				  0, 0, TLV_DB_SCALE_ITEM(-1200, 0, 0),

				  1, 9, TLV_DB_SCALE_ITEM(0, 150, 0),

				  10, 10, TLV_DB_SCALE_ITEM(1400, 0, 0));

static const char * const pwmfreq_text[] = { "300KHz", "325KHz", "350KHz", "375KHz" };

static const struct soc_enum rt9123_pwm_freq_enum =

	SOC_ENUM_SINGLE(RT9123_REG_AMPCTRL, 4, ARRAY_SIZE(pwmfreq_text), pwmfreq_text);

static const char * const i2sch_text[] = { "(L+R)/2", "LCH", "RCH", "(L+R)/2" };

static const struct soc_enum rt9123_i2sch_select_enum =

	SOC_ENUM_SINGLE(RT9123_REG_I2SOPT, 4, ARRAY_SIZE(i2sch_text), i2sch_text);



static int rt9123_kcontrol_name_comp(struct snd_kcontrol *kcontrol, const char *s)

{

	struct snd_soc_component *comp = snd_soc_kcontrol_component(kcontrol);

	const char *kctlname = kcontrol->id.name;



	if (comp && comp->name_prefix)

		kctlname += strlen(comp->name_prefix) + 1;



	return strcmp(kctlname, s);

}



static int rt9123_xhandler_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)

{

	struct snd_soc_component *comp = snd_soc_kcontrol_component(kcontrol);

	struct device *dev = comp->dev;

	int ret;



	ret = pm_runtime_resume_and_get(dev);

	if (ret)

		return ret;



	/*

	 * Since the RG bitfield for 'Speaker Volume' and 'PWM Frequency Select' are located in

	 * volatile RG address, special handling here with pm runtime API to guarantee RG read

	 * operation.

	 */

	if (rt9123_kcontrol_name_comp(kcontrol, "Speaker Volume") == 0)

		ret = snd_soc_get_volsw(kcontrol, ucontrol);

	else

		ret = snd_soc_get_enum_double(kcontrol, ucontrol);



	if (ret < 0)

		dev_err(dev, "Failed to get control (%d)\n", ret);



	pm_runtime_mark_last_busy(dev);

	pm_runtime_put_autosuspend(dev);

	return ret;

}



static int rt9123_xhandler_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)

{

	struct snd_soc_component *comp = snd_soc_kcontrol_component(kcontrol);

	struct device *dev = comp->dev;

	int ret;



	ret = pm_runtime_resume_and_get(dev);

	if (ret)

		return ret;



	/*

	 * Since the RG bitfield for 'Speaker Volume' and 'PWM Frequency Select' are located in

	 * volatile RG address, special handling here with pm runtime API to guarantee RG write

	 * operation.

	 */

	if (rt9123_kcontrol_name_comp(kcontrol, "Speaker Volume") == 0)

		ret = snd_soc_put_volsw(kcontrol, ucontrol);

	else

		ret = snd_soc_put_enum_double(kcontrol, ucontrol);



	if (ret < 0)

		dev_err(dev, "Failed to put control (%d)\n", ret);



	pm_runtime_mark_last_busy(dev);

	pm_runtime_put_autosuspend(dev);

	return ret;

}



static const struct snd_kcontrol_new rt9123_controls[] = {

	SOC_SINGLE_TLV("Master Volume", RT9123_REG_VOLGAIN, 2, 511, 1, dig_tlv),

	SOC_SINGLE_EXT_TLV("Speaker Volume", RT9123_REG_AMPCTRL, 0, 10, 0, rt9123_xhandler_get,

			   rt9123_xhandler_put, ana_tlv),

	SOC_ENUM_EXT("PWM Frequency Select", rt9123_pwm_freq_enum, rt9123_xhandler_get,

		     rt9123_xhandler_put),

	SOC_ENUM("I2S CH Select", rt9123_i2sch_select_enum),

	SOC_SINGLE("Silence Detect Switch", RT9123_REG_SILVOLEN, 14, 1, 0),

};



static const struct snd_soc_component_driver rt9123_comp_driver = {

	.controls		= rt9123_controls,

	.num_controls		= ARRAY_SIZE(rt9123_controls),

	.dapm_widgets		= rt9123_dapm_widgets,

	.num_dapm_widgets	= ARRAY_SIZE(rt9123_dapm_widgets),

	.dapm_routes		= rt9123_dapm_routes,

	.num_dapm_routes	= ARRAY_SIZE(rt9123_dapm_routes),

	.use_pmdown_time	= 1,

	.endianness		= 1,

};



static int rt9123_dai_set_format(struct snd_soc_dai *dai, unsigned int fmt)

{

	struct rt9123_priv *rt9123 = snd_soc_dai_get_drvdata(dai);



	rt9123->dai_fmt = fmt;

	return 0;

}



static int rt9123_dai_set_tdm_slot(struct snd_soc_dai *dai, unsigned int tx_mask,

				   unsigned int rx_mask, int slots, int slot_width)

{

	struct rt9123_priv *rt9123 = snd_soc_dai_get_drvdata(dai);

	struct snd_soc_component *comp = dai->component;

	struct device *dev = dai->dev;

	unsigned int rx_loc;



	dev_dbg(dev, "(slots, slot_width) = (%d, %d), (txmask, rxmask) = 0x%x, 0x%x\n", slots,

		slot_width, tx_mask, rx_mask);



	if (slots <= 0 || slot_width <= 0 || slots % 2 || slot_width % 8 ||

			slots * slot_width > 256) {

		dev_err(dev, "Invalid slot parameter (%d, %d)\n", slots, slot_width);

		return -EINVAL;

	}



	if (!rx_mask || hweight_long(rx_mask) > 1 || ffs(rx_mask) > slots) {

		dev_err(dev, "Invalid rx_mask 0x%08x, slots = %d\n", rx_mask, slots);

		return -EINVAL;

	}



	/* Configure rx channel data location */

	rx_loc = (ffs(rx_mask) - 1) * slot_width / 8;

	snd_soc_component_write_field(comp, RT9123_REG_TDMRX, RT9123_MASK_TDMRXLOC, rx_loc);



	rt9123->tdm_slots = slots;

	rt9123->tdm_slot_width = slot_width;



	return 0;

}



static int rt9123_dai_hw_params(struct snd_pcm_substream *substream,

				struct snd_pcm_hw_params *param, struct snd_soc_dai *dai)

{

	struct rt9123_priv *rt9123 = snd_soc_dai_get_drvdata(dai);

	struct snd_soc_component *comp = dai->component;

	unsigned int fmtval, width, slot_width;

	struct device *dev = dai->dev;

	unsigned int audfmt, audbit;



	fmtval = FIELD_GET(SND_SOC_DAIFMT_FORMAT_MASK, rt9123->dai_fmt);

	if (rt9123->tdm_slots && fmtval != SND_SOC_DAIFMT_DSP_A && fmtval != SND_SOC_DAIFMT_DSP_B) {

		dev_err(dev, "TDM only can support DSP_A or DSP_B format\n");

		return -EINVAL;

	}



	switch (fmtval) {

	case SND_SOC_DAIFMT_I2S:

		audfmt = 0;

		break;

	case SND_SOC_DAIFMT_LEFT_J:

		audfmt = 1;

		break;

	case SND_SOC_DAIFMT_RIGHT_J:

		audfmt = 2;

		break;

	case SND_SOC_DAIFMT_DSP_B:

		audfmt = rt9123->tdm_slots ? 4 : 3;

		break;

	case SND_SOC_DAIFMT_DSP_A:

		audfmt = rt9123->tdm_slots ? 12 : 11;

		break;

	default:

		dev_err(dev, "Unsupported format %d\n", fmtval);

		return -EINVAL;

	}



	switch (width = params_width(param)) {

	case 16:

		audbit = 0;

		break;

	case 20:

		audbit = 1;

		break;

	case 24:

		audbit = 2;

		break;

	case 32:

		audbit = 3;

		break;

	case 8:

		audbit = 4;

		break;

	default:

		dev_err(dev, "Unsupported width %d\n", width);

		return -EINVAL;

	}



	slot_width = params_physical_width(param);

	if (rt9123->tdm_slots && slot_width > rt9123->tdm_slot_width) {

		dev_err(dev, "Slot width is larger than TDM slot width\n");

		return -EINVAL;

	}



	snd_soc_component_write_field(comp, RT9123_REG_I2SOPT, RT9123_MASK_AUDFMT, audfmt);

	snd_soc_component_write_field(comp, RT9123_REG_I2SOPT, RT9123_MASK_AUDBIT, audbit);



	return 0;

}



static const struct snd_soc_dai_ops rt9123_dai_ops = {

	.set_fmt	= rt9123_dai_set_format,

	.set_tdm_slot	= rt9123_dai_set_tdm_slot,

	.hw_params	= rt9123_dai_hw_params,

};



static struct snd_soc_dai_driver rt9123_dai_driver = {

	.name = "HiFi",

	.playback = {

		.stream_name	= "HiFi Playback",

		.formats	= SNDRV_PCM_FMTBIT_S16 | SNDRV_PCM_FMTBIT_S24 |

				  SNDRV_PCM_FMTBIT_S32,

		.rates		= SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000 |

				  SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_24000 |

				  SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |

				  SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 |

				  SNDRV_PCM_RATE_96000,

		.rate_min	= 8000,

		.rate_max	= 96000,

		.channels_min	= 1,

		.channels_max	= 2,

	},

	.ops    = &rt9123_dai_ops,

};



static bool rt9123_readable_reg(struct device *dev, unsigned int reg)

{

	switch (reg) {

	case 0x00 ... 0x05:

	case 0x12 ... 0x13:

	case 0x20 ... 0x21:

	case 0x36:

		return true;

	default:

		return false;

	}

}



static bool rt9123_writeable_reg(struct device *dev, unsigned int reg)

{

	switch (reg) {

	case 0x01 ... 0x05:

	case 0x12 ... 0x13:

	case 0x20 ... 0x21:

		return true;

	default:

		return false;

	}

}



static bool rt9123_volatile_reg(struct device *dev, unsigned int reg)

{

	switch (reg) {

	case 0x01:

	case 0x20:

	case 0x36:

		return true;

	default:

		return false;

	}

}



static const struct regmap_config rt9123_regmap_config = {

	.name			= "rt9123",

	.reg_bits		= 8,

	.val_bits		= 16,

	.val_format_endian	= REGMAP_ENDIAN_BIG,

	.readable_reg		= rt9123_readable_reg,

	.writeable_reg		= rt9123_writeable_reg,

	.volatile_reg		= rt9123_volatile_reg,

	.cache_type		= REGCACHE_MAPLE,

	.num_reg_defaults_raw	= RT9123_REG_ANAFLAG + 1,

};



static int rt9123_i2c_probe(struct i2c_client *i2c)

{

	struct device *dev = &i2c->dev;

	struct rt9123_priv *rt9123;

	struct regmap *regmap;

	__be16 value;

	u16 venid;

	int ret;



	rt9123 = devm_kzalloc(dev, sizeof(*rt9123), GFP_KERNEL);

	if (!rt9123)

		return -ENOMEM;



	rt9123->enable = devm_gpiod_get_optional(dev, "enable", GPIOD_OUT_HIGH);

	if (IS_ERR(rt9123->enable))

		return PTR_ERR(rt9123->enable);

	else if (rt9123->enable)

		usleep_range(250, 350);

	else

		dev_dbg(dev, "No 'enable' GPIO specified, treat it as default on\n");



	/* Check vendor id information */

	ret = i2c_smbus_read_word_data(i2c, RT9123_REG_COMBOID);

	if (ret < 0)

		return dev_err_probe(dev, ret, "Failed to read vendor-id\n");



	venid = be16_to_cpu(ret);

	if ((venid & RT9123_MASK_VENID) != RT9123_FIXED_VENID)

		return dev_err_probe(dev, -ENODEV, "Incorrect vendor-id 0x%04x\n", venid);



	/* Trigger RG reset before regmap init cache */

	value = cpu_to_be16(RT9123_MASK_SWRST);

	ret = i2c_smbus_write_word_data(i2c, RT9123_REG_AMPCTRL, value);

	if (ret)

		return dev_err_probe(dev, ret, "Failed to trigger RG reset\n");



	/* Need to wait 10ms for the reset to complete */

	usleep_range(10000, 11000);



	regmap = devm_regmap_init_i2c(i2c, &rt9123_regmap_config);

	if (IS_ERR(regmap))

		return dev_err_probe(dev, PTR_ERR(regmap), "Failed to init regmap\n");



	i2c_set_clientdata(i2c, rt9123);



	pm_runtime_set_autosuspend_delay(dev, 500);

	pm_runtime_use_autosuspend(dev);

	pm_runtime_set_active(dev);

	ret = devm_pm_runtime_enable(dev);

	if (ret)

		return dev_err_probe(dev, ret, "Failed to enable pm runtime\n");



	return devm_snd_soc_register_component(dev, &rt9123_comp_driver, &rt9123_dai_driver, 1);

}



#ifdef CONFIG_PM

static int rt9123_runtime_suspend(struct device *dev)

{

	struct rt9123_priv *rt9123 = dev_get_drvdata(dev);

	struct regmap *regmap = dev_get_regmap(dev, NULL);



	if (rt9123->enable) {

		regcache_cache_only(regmap, true);

		regcache_mark_dirty(regmap);

		gpiod_set_value(rt9123->enable, 0);

	}



	return 0;

}



static int rt9123_runtime_resume(struct device *dev)

{

	struct rt9123_priv *rt9123 = dev_get_drvdata(dev);

	struct regmap *regmap = dev_get_regmap(dev, NULL);

	int ret;



	if (rt9123->enable) {

		gpiod_set_value(rt9123->enable, 1);

		usleep_range(250, 350);



		regcache_cache_only(regmap, false);

		ret = regcache_sync(regmap);

		if (ret)

			return ret;

	}



	return 0;

}

#endif



static const struct dev_pm_ops rt9123_dev_pm_ops = {

	SET_RUNTIME_PM_OPS(rt9123_runtime_suspend, rt9123_runtime_resume, NULL)

};



#ifdef CONFIG_OF

static const struct of_device_id rt9123_device_id[] = {

	{ .compatible = "richtek,rt9123" },

	{}

};

MODULE_DEVICE_TABLE(of, rt9123_device_id);

#endif



#ifdef CONFIG_ACPI

static const struct acpi_device_id rt9123_acpi_match[] = {

	{ "RT9123", 0 },

	{}

};

MODULE_DEVICE_TABLE(acpi, rt9123_acpi_match);

#endif



static struct i2c_driver rt9123_i2c_driver = {

	.driver = {

		.name = "rt9123",

		.of_match_table = of_match_ptr(rt9123_device_id),

		.acpi_match_table = ACPI_PTR(rt9123_acpi_match),

		.pm = pm_ptr(&rt9123_dev_pm_ops),

	},

	.probe	= rt9123_i2c_probe,

};

module_i2c_driver(rt9123_i2c_driver);



MODULE_AUTHOR("ChiYuan Huang <cy_huang@richtek.com>");

MODULE_DESCRIPTION("ASoC rt9123 Driver");

MODULE_LICENSE("GPL");