linux/sound/soc/codecs/rtq9128.c

// SPDX-License-Identifier: GPL-2.0-only
//
// Copyright (c) 2023 Richtek Technology Corp.
//
// Author: ChiYuan Huang <cy_huang@richtek.com>
//

#include <linux/bitfield.h>
#include <linux/bits.h>
#include <linux/delay.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/pm_runtime.h>
#include <linux/property.h>
#include <linux/regmap.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/tlv.h>

#define RTQ9128_REG_SDI_SEL	0x00
#define RTQ9128_REG_SDO_SEL	0x01
#define RTQ9128_REG_I2S_OPT	0x02
#define RTQ9128_REG_MISC	0x03
#define RTQ9128_REG_STATE_CTRL	0x04
#define RTQ9128_REG_PLLTRI_GEN1	0x05
#define RTQ9128_REG_PLLTRI_GEN2	0x06
#define RTQ9128_REG_PWM_SS_OPT	0x07
#define RTQ9128_REG_DSP_EN	0x08
#define RTQ9128_REG_TDM_TX_CH1	0x21
#define RTQ9128_REG_TDM_RX_CH1	0x25
#define RTQ9128_REG_MS_VOL	0x30
#define RTQ9128_REG_CH1_VOL	0x31
#define RTQ9128_REG_CH2_VOL	0x32
#define RTQ9128_REG_CH3_VOL	0x33
#define RTQ9128_REG_CH4_VOL	0x34
#define RTQ9128_REG_PROT_OPT	0x71
#define RTQ9128_REG_EFUSE_DATA	0xE0
#define RTQ9128_REG_VENDOR_ID	0xF9

#define RTQ9128_CHSTAT_VAL_MASK	GENMASK(1, 0)
#define RTQ9128_DOLEN_MASK	GENMASK(7, 6)
#define RTQ9128_TDMSRCIN_MASK	GENMASK(5, 4)
#define RTQ9128_AUDBIT_MASK	GENMASK(5, 4)
#define RTQ9128_AUDFMT_MASK	GENMASK(3, 0)
#define RTQ9128_MSMUTE_MASK	BIT(0)
#define RTQ9128_DIE_CHECK_MASK	GENMASK(4, 0)
#define RTQ9128_VENDOR_ID_MASK	GENMASK(19, 8)

#define RTQ9128_SOFT_RESET_VAL	0x80
#define RTQ9128_VENDOR_ID_VAL	0x470
#define RTQ9128_ALLCH_HIZ_VAL	0x55
#define RTQ9128_ALLCH_ULQM_VAL	0xFF
#define RTQ9128_TKA470B_VAL	0
#define RTQ9128_RTQ9128DH_VAL	0x0F
#define RTQ9128_RTQ9128DL_VAL	0x10

struct rtq9128_data {
	struct gpio_desc *enable;
	unsigned int daifmt;
	int tdm_slots;
	int tdm_slot_width;
	bool tdm_input_data2_select;
};

struct rtq9128_init_reg {
	unsigned int reg;
	unsigned int val;
};

static int rtq9128_get_reg_size(unsigned int reg)
{
	switch (reg) {
	case 0x5C ... 0x6F:
	case 0x98 ... 0x9F:
	case 0xC0 ... 0xC3:
	case 0xC8 ... 0xCF:
	case 0xDF ... 0xE5:
	case 0xF9:
		return 4;
	case 0x40 ... 0x4F:
		return 3;
	case 0x30 ... 0x35:
	case 0x8C ... 0x97:
	case 0xC4 ... 0xC7:
	case 0xD7 ... 0xDA:
		return 2;
	default:
		return 1;
	}
}

static int rtq9128_i2c_write(void *context, const void *data, size_t count)
{
	struct device *dev = context;
	struct i2c_client *i2c = to_i2c_client(dev);
	u8 reg = *(u8 *)data;
	int rg_size;

	if (count != 5) {
		dev_err(dev, "Invalid write for data length (%d)\n", (int)count);
		return -EINVAL;
	}

	rg_size = rtq9128_get_reg_size(reg);
	return i2c_smbus_write_i2c_block_data(i2c, reg, rg_size, data + count - rg_size);
}

static int rtq9128_i2c_read(void *context, const void *reg_buf, size_t reg_size, void *val_buf,
			    size_t val_size)
{
	struct device *dev = context;
	struct i2c_client *i2c = to_i2c_client(dev);
	u8 reg = *(u8 *)reg_buf;
	u8 data_tmp[4] = {};
	int rg_size, ret;

	if (reg_size != 1 || val_size != 4) {
		dev_err(dev, "Invalid read for reg_size (%d) or val_size (%d)\n", (int)reg_size,
			(int)val_size);
		return -EINVAL;
	}

	rg_size = rtq9128_get_reg_size(reg);
	ret = i2c_smbus_read_i2c_block_data(i2c, reg, rg_size, data_tmp);
	if (ret < 0)
		return ret;
	else if (ret != rg_size)
		return -EIO;

	memset(val_buf, 0, val_size - rg_size);
	memcpy(val_buf + val_size - rg_size, data_tmp, rg_size);

	return 0;
}

static const struct regmap_bus rtq9128_regmap_bus = {
	.write = rtq9128_i2c_write,
	.read = rtq9128_i2c_read,
	.max_raw_read = 4,
	.max_raw_write = 4,
};

static bool rtq9128_is_readable_reg(struct device *dev, unsigned int reg)
{
	switch (reg) {
	case 0x00 ... 0x2B:
	case 0x30 ... 0x35:
	case 0x40 ... 0x56:
	case 0x5C ... 0x76:
	case 0x80 ... 0xAD:
	case 0xB0 ... 0xBA:
	case 0xC0 ... 0xE5:
	case 0xF0 ... 0xFB:
		return true;
	default:
		return false;
	}
}

static bool rtq9128_is_writeable_reg(struct device *dev, unsigned int reg)
{
	switch (reg) {
	case 0x00 ... 0x1F:
	case 0x21 ... 0x2B:
	case 0x30 ... 0x35:
	case 0x40 ... 0x56:
	case 0x5C ... 0x76:
	case 0x80 ... 0x8B:
	case 0xA0 ... 0xAD:
	case 0xB0 ... 0xBA:
	case 0xC0:
	case 0xD0 ... 0xDE:
	case 0xE0 ... 0xE5:
	case 0xF0 ... 0xF3:
	case 0xF6 ... 0xF8:
	case 0xFA ... 0xFB:
		return true;
	default:
		return false;
	}
}

static bool rtq9128_is_volatile_reg(struct device *dev, unsigned int reg)
{
	switch (reg) {
	case 0x0F ... 0x17:
	case 0x20:
	case 0x53:
	case 0x55:
	case 0x5C ... 0x6F:
	case 0x8C ... 0x9F:
	case 0xC0 ... 0xCF:
	case 0xDF:
	case 0xF0 ... 0xF1:
	case 0xF4 ... 0xF5:
		return true;
	default:
		return false;
	}
}

static const struct regmap_config rtq9128_regmap_config = {
	.name = "rtq9128",
	.reg_bits = 8,
	.val_bits = 32,
	.val_format_endian = REGMAP_ENDIAN_BIG,
	.cache_type = REGCACHE_MAPLE,

	.readable_reg = rtq9128_is_readable_reg,
	.writeable_reg = rtq9128_is_writeable_reg,
	.volatile_reg = rtq9128_is_volatile_reg,
	.num_reg_defaults_raw = RTQ9128_REG_VENDOR_ID + 1,
};

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

static const DECLARE_TLV_DB_RANGE(spkgain_tlv,
	0, 3, TLV_DB_SCALE_ITEM(-600, 600, 0),
	4, 5, TLV_DB_SCALE_ITEM(1500, 300, 0),
);

static const char * const source_select_text[] = { "CH1", "CH2", "CH3", "CH4" };
static const char * const pwmfreq_select_text[] = { "8fs", "10fs", "40fs", "44fs", "48fs" };
static const char * const phase_select_text[] = {
	"0 degree",	"45 degree",	"90 degree",	"135 degree",
	"180 degree",	"225 degree",	"270 degree",	"315 degree",
};
static const char * const dvdduv_select_text[] = { "1P4V", "1P5V", "2P1V", "2P3V" };

static const struct soc_enum rtq9128_ch1_si_enum =
	SOC_ENUM_SINGLE(RTQ9128_REG_SDI_SEL, 6, ARRAY_SIZE(source_select_text), source_select_text);
static const struct soc_enum rtq9128_ch2_si_enum =
	SOC_ENUM_SINGLE(RTQ9128_REG_SDI_SEL, 4, ARRAY_SIZE(source_select_text), source_select_text);
static const struct soc_enum rtq9128_ch3_si_enum =
	SOC_ENUM_SINGLE(RTQ9128_REG_SDI_SEL, 2, ARRAY_SIZE(source_select_text), source_select_text);
static const struct soc_enum rtq9128_ch4_si_enum =
	SOC_ENUM_SINGLE(RTQ9128_REG_SDI_SEL, 0, ARRAY_SIZE(source_select_text), source_select_text);
static const struct soc_enum rtq9128_pwm_freq_enum =
	SOC_ENUM_SINGLE(RTQ9128_REG_PLLTRI_GEN1, 4, ARRAY_SIZE(pwmfreq_select_text),
			pwmfreq_select_text);
static const struct soc_enum rtq9128_out2_phase_enum =
	SOC_ENUM_SINGLE(RTQ9128_REG_PLLTRI_GEN1, 0, ARRAY_SIZE(phase_select_text),
			phase_select_text);
static const struct soc_enum rtq9128_out3_phase_enum =
	SOC_ENUM_SINGLE(RTQ9128_REG_PLLTRI_GEN2, 4, ARRAY_SIZE(phase_select_text),
			phase_select_text);
static const struct soc_enum rtq9128_out4_phase_enum =
	SOC_ENUM_SINGLE(RTQ9128_REG_PLLTRI_GEN2, 0, ARRAY_SIZE(phase_select_text),
			phase_select_text);

/*
 * In general usage, DVDD could be 1P8V, 3P0V or 3P3V.
 * This DVDD undervoltage protection is to prevent from the abnormal power
 * lose case while the amplifier is operating. Due to the different DVDD
 * application, treat this threshold as a user choosable option.
 */
static const struct soc_enum rtq9128_dvdduv_select_enum =
	SOC_ENUM_SINGLE(RTQ9128_REG_PROT_OPT, 6, ARRAY_SIZE(dvdduv_select_text),
			dvdduv_select_text);

static const struct snd_kcontrol_new rtq9128_snd_ctrls[] = {
	SOC_SINGLE_TLV("MS Volume", RTQ9128_REG_MS_VOL, 2, 511, 1, dig_tlv),
	SOC_SINGLE_TLV("CH1 Volume", RTQ9128_REG_CH1_VOL, 2, 511, 1, dig_tlv),
	SOC_SINGLE_TLV("CH2 Volume", RTQ9128_REG_CH2_VOL, 2, 511, 1, dig_tlv),
	SOC_SINGLE_TLV("CH3 Volume", RTQ9128_REG_CH3_VOL, 2, 511, 1, dig_tlv),
	SOC_SINGLE_TLV("CH4 Volume", RTQ9128_REG_CH4_VOL, 2, 511, 1, dig_tlv),
	SOC_SINGLE_TLV("SPK Gain Volume", RTQ9128_REG_MISC, 0, 5, 0, spkgain_tlv),
	SOC_SINGLE("PBTL12 Switch", RTQ9128_REG_MISC, 5, 1, 0),
	SOC_SINGLE("PBTL34 Switch", RTQ9128_REG_MISC, 4, 1, 0),
	SOC_SINGLE("Spread Spectrum Switch", RTQ9128_REG_PWM_SS_OPT, 7, 1, 0),
	SOC_SINGLE("SDO Select", RTQ9128_REG_SDO_SEL, 0, 15, 0),
	SOC_ENUM("CH1 SI Select", rtq9128_ch1_si_enum),
	SOC_ENUM("CH2 SI Select", rtq9128_ch2_si_enum),
	SOC_ENUM("CH3 SI Select", rtq9128_ch3_si_enum),
	SOC_ENUM("CH4 SI Select", rtq9128_ch4_si_enum),
	SOC_ENUM("PWM FREQ Select", rtq9128_pwm_freq_enum),
	SOC_ENUM("OUT2 Phase Select", rtq9128_out2_phase_enum),
	SOC_ENUM("OUT3 Phase Select", rtq9128_out3_phase_enum),
	SOC_ENUM("OUT4 Phase Select", rtq9128_out4_phase_enum),
	SOC_ENUM("DVDD UV Threshold Select", rtq9128_dvdduv_select_enum),
};

static int rtq9128_dac_power_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);
	unsigned int shift, mask;
	int ret;

	dev_dbg(comp->dev, "%s: %s event %d\n", __func__, w->name, event);

	if (snd_soc_dapm_widget_name_cmp(w, "DAC1") == 0)
		shift = 6;
	else if (snd_soc_dapm_widget_name_cmp(w, "DAC2") == 0)
		shift = 4;
	else if (snd_soc_dapm_widget_name_cmp(w, "DAC3") == 0)
		shift = 2;
	else
		shift = 0;

	mask = RTQ9128_CHSTAT_VAL_MASK << shift;

	/* Turn channel state to Normal or HiZ */
	ret = snd_soc_component_write_field(comp, RTQ9128_REG_STATE_CTRL, mask,
					    event != SND_SOC_DAPM_POST_PMU);
	if (ret < 0)
		return ret;

	/*
	 * For each channel turns on, HW will trigger DC load detect and DC
	 * offset calibration, the time is needed for all the actions done.
	 */
	if (event == SND_SOC_DAPM_POST_PMU)
		msleep(25);

	return 0;
}

static const struct snd_soc_dapm_widget rtq9128_dapm_widgets[] = {
	SND_SOC_DAPM_DAC_E("DAC1", NULL, SND_SOC_NOPM, 0, 0, rtq9128_dac_power_event,
			   SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_POST_PMD),
	SND_SOC_DAPM_DAC_E("DAC2", NULL, SND_SOC_NOPM, 0, 0, rtq9128_dac_power_event,
			   SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_POST_PMD),
	SND_SOC_DAPM_DAC_E("DAC3", NULL, SND_SOC_NOPM, 0, 0, rtq9128_dac_power_event,
			   SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_POST_PMD),
	SND_SOC_DAPM_DAC_E("DAC4", NULL, SND_SOC_NOPM, 0, 0, rtq9128_dac_power_event,
			   SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_POST_PMD),
	SND_SOC_DAPM_OUTPUT("OUT1"),
	SND_SOC_DAPM_OUTPUT("OUT2"),
	SND_SOC_DAPM_OUTPUT("OUT3"),
	SND_SOC_DAPM_OUTPUT("OUT4"),
};

static const struct snd_soc_dapm_route rtq9128_dapm_routes[] = {
	{ "DAC1", NULL, "Playback" },
	{ "DAC2", NULL, "Playback" },
	{ "DAC3", NULL, "Playback" },
	{ "DAC4", NULL, "Playback" },
	{ "OUT1", NULL, "DAC1" },
	{ "OUT2", NULL, "DAC2" },
	{ "OUT3", NULL, "DAC3" },
	{ "OUT4", NULL, "DAC4" },
	{ "Capture", NULL, "DAC1" },
	{ "Capture", NULL, "DAC2" },
	{ "Capture", NULL, "DAC3" },
	{ "Capture", NULL, "DAC4" },
};

static const struct rtq9128_init_reg rtq9128_tka470b_tables[] = {
	{ 0xA0, 0xEF },
	{ 0x0D, 0x00 },
	{ 0x03, 0x05 },
	{ 0x05, 0x31 },
	{ 0x06, 0x23 },
	{ 0x70, 0x11 },
	{ 0x75, 0x1F },
	{ 0xB6, 0x03 },
	{ 0xB9, 0x03 },
	{ 0xB8, 0x03 },
	{ 0xC1, 0xFF },
	{ 0xF8, 0x72 },
	{ 0x30, 0x180 },
};

static const struct rtq9128_init_reg rtq9128_dh_tables[] = {
	{ 0x0F, 0x00 },
	{ 0x03, 0x0D },
	{ 0xB2, 0xFF },
	{ 0xB3, 0xFF },
	{ 0x30, 0x180 },
	{ 0x8A, 0x55 },
	{ 0x72, 0x00 },
	{ 0xB1, 0xE3 },
};

static const struct rtq9128_init_reg rtq9128_dl_tables[] = {
	{ 0x0F, 0x00 },
	{ 0x03, 0x0D },
	{ 0x30, 0x180 },
	{ 0x8A, 0x55 },
	{ 0x72, 0x00 },
	{ 0xB1, 0xE3 },
};

static int rtq9128_component_probe(struct snd_soc_component *comp)
{
	const struct rtq9128_init_reg *table, *curr;
	size_t table_size;
	unsigned int val;
	int i, ret;

	ret = pm_runtime_resume_and_get(comp->dev);
	if (ret < 0) {
		dev_err(comp->dev, "Failed to resume device (%d)\n", ret);
		return ret;
	}

	val = snd_soc_component_read(comp, RTQ9128_REG_EFUSE_DATA);

	switch (FIELD_GET(RTQ9128_DIE_CHECK_MASK, val)) {
	case RTQ9128_TKA470B_VAL:
		table = rtq9128_tka470b_tables;
		table_size = ARRAY_SIZE(rtq9128_tka470b_tables);
		break;
	case RTQ9128_RTQ9128DH_VAL:
		table = rtq9128_dh_tables;
		table_size = ARRAY_SIZE(rtq9128_dh_tables);
		break;
	default:
		table = rtq9128_dl_tables;
		table_size = ARRAY_SIZE(rtq9128_dl_tables);
		break;
	}

	for (i = 0, curr = table; i < table_size; i++, curr++) {
		ret = snd_soc_component_write(comp, curr->reg, curr->val);
		if (ret < 0)
			return ret;
	}

	pm_runtime_mark_last_busy(comp->dev);
	pm_runtime_put(comp->dev);

	return 0;
}

static const struct snd_soc_component_driver rtq9128_comp_driver = {
	.probe = rtq9128_component_probe,
	.controls = rtq9128_snd_ctrls,
	.num_controls = ARRAY_SIZE(rtq9128_snd_ctrls),
	.dapm_widgets = rtq9128_dapm_widgets,
	.num_dapm_widgets = ARRAY_SIZE(rtq9128_dapm_widgets),
	.dapm_routes = rtq9128_dapm_routes,
	.num_dapm_routes = ARRAY_SIZE(rtq9128_dapm_routes),
	.use_pmdown_time = 1,
	.endianness = 1,
};

static int rtq9128_dai_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
{
	struct rtq9128_data *data = snd_soc_dai_get_drvdata(dai);
	struct device *dev = dai->dev;

	dev_dbg(dev, "%s: fmt 0x%8x\n", __func__, fmt);

	/* Only support bitclock & framesync as consumer */
	if ((fmt & SND_SOC_DAIFMT_MASTER_MASK) != SND_SOC_DAIFMT_BC_FC) {
		dev_err(dev, "Only support BCK and LRCK as consumer\n");
		return -EINVAL;
	}

	/* Store here and will be used in runtime hw_params for DAI format setting */
	data->daifmt = fmt;

	return 0;
}

static int rtq9128_dai_set_tdm_slot(struct snd_soc_dai *dai, unsigned int tx_mask,
				    unsigned int rx_mask, int slots, int slot_width)
{
	struct rtq9128_data *data = snd_soc_dai_get_drvdata(dai);
	struct snd_soc_component *comp = dai->component;
	struct device *dev = dai->dev;
	unsigned int mask, start_loc, srcin_select;
	int i, frame_length, ret;

	dev_dbg(dev, "%s: slot %d slot_width %d, tx/rx mask 0x%x 0x%x\n", __func__, slots,
		slot_width, tx_mask, rx_mask);

	if (slots <= 0 || slot_width <= 0 || slot_width % 8) {
		dev_err(dev, "Invalid slot numbers (%d) or width (%d)\n", slots, slot_width);
		return -EINVAL;
	}

	/* HW supported maximum frame length 512 */
	frame_length = slots * slot_width;
	if (frame_length > 512) {
		dev_err(dev, "frame length exceed the maximum (%d)\n", frame_length);
		return -EINVAL;
	}

	if (!rx_mask || hweight_long(tx_mask) > slots || hweight_long(rx_mask) > slots ||
	    fls(tx_mask) > slots || fls(rx_mask) > slots) {
		dev_err(dev, "Invalid tx/rx mask (0x%x/0x%x)\n", tx_mask, rx_mask);
		return -EINVAL;
	}

	for (mask = tx_mask, i = 0; i < 4 && mask; i++) {
		start_loc = (ffs(mask) - 1) * slot_width / 8;
		mask &= ~BIT(ffs(mask) - 1);

		ret = snd_soc_component_write(comp, RTQ9128_REG_TDM_TX_CH1 + i, start_loc);
		if (ret < 0) {
			dev_err(dev, "Failed to assign tx_loc %d (%d)\n", i, ret);
			return ret;
		}
	}

	for (mask = rx_mask, i = 0; i < 4 && mask; i++) {
		start_loc = (ffs(mask) - 1) * slot_width / 8;
		mask &= ~BIT(ffs(mask) - 1);

		ret = snd_soc_component_write(comp, RTQ9128_REG_TDM_RX_CH1 + i, start_loc);
		if (ret < 0) {
			dev_err(dev, "Failed to assign rx_loc %d (%d)\n", i, ret);
			return ret;
		}
	}

	srcin_select = data->tdm_input_data2_select ? RTQ9128_TDMSRCIN_MASK : 0;
	ret = snd_soc_component_update_bits(comp, RTQ9128_REG_SDO_SEL, RTQ9128_TDMSRCIN_MASK,
					    srcin_select);
	if (ret < 0) {
		dev_err(dev, "Failed to configure TDM source input select\n");
		return ret;
	}

	data->tdm_slots = slots;
	data->tdm_slot_width = slot_width;

	return 0;
}

static int rtq9128_dai_hw_params(struct snd_pcm_substream *stream, struct snd_pcm_hw_params *param,
				 struct snd_soc_dai *dai)
{
	struct rtq9128_data *data = snd_soc_dai_get_drvdata(dai);
	unsigned int width, slot_width, bitrate, audbit, dolen;
	struct snd_soc_component *comp = dai->component;
	struct device *dev = dai->dev;
	unsigned int fmtval, audfmt;
	int ret;

	dev_dbg(dev, "%s: width %d\n", __func__, params_width(param));

	fmtval = FIELD_GET(SND_SOC_DAIFMT_FORMAT_MASK, data->daifmt);
	if (data->tdm_slots && fmtval != SND_SOC_DAIFMT_DSP_A && fmtval != SND_SOC_DAIFMT_DSP_B) {
		dev_err(dev, "TDM is used, format only support DSP_A or DSP_B\n");
		return -EINVAL;
	}

	switch (fmtval) {
	case SND_SOC_DAIFMT_I2S:
		audfmt = 8;
		break;
	case SND_SOC_DAIFMT_LEFT_J:
		audfmt = 9;
		break;
	case SND_SOC_DAIFMT_RIGHT_J:
		audfmt = 10;
		break;
	case SND_SOC_DAIFMT_DSP_A:
		audfmt = data->tdm_slots ? 12 : 11;
		break;
	case SND_SOC_DAIFMT_DSP_B:
		audfmt = data->tdm_slots ? 4 : 3;
		break;
	default:
		dev_err(dev, "Unsupported format 0x%8x\n", fmtval);
		return -EINVAL;
	}

	switch (width = params_width(param)) {
	case 16:
		audbit = 0;
		break;
	case 18:
		audbit = 1;
		break;
	case 20:
		audbit = 2;
		break;
	case 24:
	case 32:
		audbit = 3;
		break;
	default:
		dev_err(dev, "Unsupported width (%d)\n", width);
		return -EINVAL;
	}

	slot_width = params_physical_width(param);

	if (data->tdm_slots) {
		if (slot_width > data->tdm_slot_width) {
			dev_err(dev, "slot width is larger than TDM slot width\n");
			return -EINVAL;
		}

		/* Check BCK not exceed the maximum supported rate 24.576MHz */
		bitrate = data->tdm_slots * data->tdm_slot_width * params_rate(param);
		if (bitrate > 24576000) {
			dev_err(dev, "bitrate exceed the maximum (%d)\n", bitrate);
			return -EINVAL;
		}

		/* If TDM is used, configure slot width as TDM slot witdh */
		slot_width = data->tdm_slot_width;
	}

	switch (slot_width) {
	case 16:
		dolen = 0;
		break;
	case 24:
		dolen = 1;
		break;
	case 32:
		dolen = 2;
		break;
	default:
		dev_err(dev, "Unsupported slot width (%d)\n", slot_width);
		return -EINVAL;
	}

	ret = snd_soc_component_write_field(comp, RTQ9128_REG_I2S_OPT, RTQ9128_AUDFMT_MASK, audfmt);
	if (ret < 0)
		return ret;

	ret = snd_soc_component_write_field(comp, RTQ9128_REG_I2S_OPT, RTQ9128_AUDBIT_MASK, audbit);
	if (ret < 0)
		return ret;

	ret = snd_soc_component_write_field(comp, RTQ9128_REG_SDO_SEL, RTQ9128_DOLEN_MASK, dolen);
	return ret < 0 ? ret : 0;
}

static int rtq9128_dai_mute_stream(struct snd_soc_dai *dai, int mute, int stream)
{
	struct snd_soc_component *comp = dai->component;
	struct device *dev = dai->dev;
	int ret;

	dev_dbg(dev, "%s: mute (%d), stream (%d)\n", __func__, mute, stream);

	ret = snd_soc_component_write_field(comp, RTQ9128_REG_DSP_EN, RTQ9128_MSMUTE_MASK,
					    mute ? 1 : 0);
	return ret < 0 ? ret : 0;
}

static const struct snd_soc_dai_ops rtq9128_dai_ops = {
	.set_fmt = rtq9128_dai_set_fmt,
	.set_tdm_slot = rtq9128_dai_set_tdm_slot,
	.hw_params = rtq9128_dai_hw_params,
	.mute_stream = rtq9128_dai_mute_stream,
	.no_capture_mute = 1,
};

#define RTQ9128_FMTS_MASK	(SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S18_3LE |\
				 SNDRV_PCM_FMTBIT_S20_LE | SNDRV_PCM_FMTBIT_S24_LE |\
				 SNDRV_PCM_FMTBIT_S32_LE)

static struct snd_soc_dai_driver rtq9128_dai = {
	.name = "rtq9128-aif",
	.playback = {
		.stream_name = "Playback",
		.rates = SNDRV_PCM_RATE_8000_192000,
		.formats = RTQ9128_FMTS_MASK,
		.channels_min = 1,
		.channels_max = 4,
	},
	.capture = {
		.stream_name = "Capture",
		.rates = SNDRV_PCM_RATE_8000_192000,
		.formats = RTQ9128_FMTS_MASK,
		.channels_min = 1,
		.channels_max = 4,
	},
	.ops = &rtq9128_dai_ops,
	.symmetric_rate = 1,
	.symmetric_sample_bits = 1,
};

static int rtq9128_probe(struct i2c_client *i2c)
{
	struct device *dev = &i2c->dev;
	struct rtq9128_data *data;
	struct regmap *regmap;
	unsigned int venid;
	int ret;

	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	data->enable = devm_gpiod_get_optional(dev, "enable", GPIOD_OUT_HIGH);
	if (IS_ERR(data->enable))
		return dev_err_probe(dev, PTR_ERR(data->enable), "Failed to get 'enable' gpio\n");
	else if (data->enable)
		usleep_range(10000, 11000);

	data->tdm_input_data2_select = device_property_read_bool(dev,
								 "richtek,tdm-input-data2-select");

	i2c_set_clientdata(i2c, data);

	/*
	 * Due to the bad design to combine SOFT_RESET bit with other function,
	 * directly use generic i2c API to trigger SOFT_RESET.
	 */
	ret = i2c_smbus_write_byte_data(i2c, RTQ9128_REG_MISC, RTQ9128_SOFT_RESET_VAL);
	if (ret)
		return dev_err_probe(dev, ret, "Failed to trigger software reset\n");

	/* After trigger soft reset, have to wait 10ms for digital reset done */
	usleep_range(10000, 11000);

	regmap = devm_regmap_init(dev, &rtq9128_regmap_bus, dev, &rtq9128_regmap_config);
	if (IS_ERR(regmap))
		return dev_err_probe(dev, PTR_ERR(regmap), "Failed to init regmap\n");

	ret = regmap_read(regmap, RTQ9128_REG_VENDOR_ID, &venid);
	if (ret)
		return dev_err_probe(dev, ret, "Failed to get vendor id\n");

	venid = FIELD_GET(RTQ9128_VENDOR_ID_MASK, venid);
	if (venid != RTQ9128_VENDOR_ID_VAL)
		return dev_err_probe(dev, -ENODEV, "Vendor ID not match (0x%x)\n", venid);

	pm_runtime_set_active(dev);
	pm_runtime_mark_last_busy(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, &rtq9128_comp_driver, &rtq9128_dai, 1);
}

static int __maybe_unused rtq9128_pm_runtime_suspend(struct device *dev)
{
	struct rtq9128_data *data = dev_get_drvdata(dev);
	struct regmap *regmap = dev_get_regmap(dev, NULL);

	/* If 'enable' gpio not specified, change all channels to ultra low quiescent */
	if (!data->enable)
		return regmap_write(regmap, RTQ9128_REG_STATE_CTRL, RTQ9128_ALLCH_ULQM_VAL);

	gpiod_set_value_cansleep(data->enable, 0);

	regcache_cache_only(regmap, true);
	regcache_mark_dirty(regmap);

	return 0;
}

static int __maybe_unused rtq9128_pm_runtime_resume(struct device *dev)
{
	struct rtq9128_data *data = dev_get_drvdata(dev);
	struct regmap *regmap = dev_get_regmap(dev, NULL);

	/* If 'enable' gpio not specified, change all channels to default Hi-Z */
	if (!data->enable)
		return regmap_write(regmap, RTQ9128_REG_STATE_CTRL, RTQ9128_ALLCH_HIZ_VAL);

	gpiod_set_value_cansleep(data->enable, 1);

	/* Wait digital block to be ready */
	usleep_range(10000, 11000);

	regcache_cache_only(regmap, false);
	return regcache_sync(regmap);
}

static const struct dev_pm_ops __maybe_unused rtq9128_pm_ops = {
	SET_RUNTIME_PM_OPS(rtq9128_pm_runtime_suspend, rtq9128_pm_runtime_resume, NULL)
};

static const struct of_device_id rtq9128_device_table[] = {
	{ .compatible = "richtek,rtq9128" },
	{}
};
MODULE_DEVICE_TABLE(of, rtq9128_device_table);

static struct i2c_driver rtq9128_driver = {
	.driver = {
		.name = "rtq9128",
		.of_match_table = rtq9128_device_table,
		.pm = pm_ptr(&rtq9128_pm_ops),
	},
	.probe = rtq9128_probe,
};
module_i2c_driver(rtq9128_driver);

MODULE_AUTHOR("ChiYuan Huang <cy_huang@richtek.com>");
MODULE_DESCRIPTION("RTQ9128 4CH Audio Amplifier Driver");
MODULE_LICENSE("GPL");