Contributors: 2
Author Tokens Token Proportion Commits Commit Proportion
Unknown 6954 99.84% 1 50.00%
Charles Han 11 0.16% 1 50.00%
Total 6965 2 


// SPDX-License-Identifier: GPL-2.0
//
// fs210x.c -- Driver for the FS2104/5S Audio Amplifier
//
// Copyright (C) 2016-2025 Shanghai FourSemi Semiconductor Co.,Ltd.

#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/gpio/consumer.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/of.h>
#include <linux/regmap.h>
#include <linux/regulator/consumer.h>
#include <linux/workqueue.h>
#include <sound/soc.h>
#include <sound/tlv.h>

#include "fs210x.h"
#include "fs-amp-lib.h"

#define FS210X_DEFAULT_FWM_NAME		"fs210x_fwm.bin"
#define FS210X_DEFAULT_DAI_NAME		"fs210x-aif"
#define FS2105S_DEVICE_ID		0x20 /* FS2105S */
#define FS210X_DEVICE_ID		0x45 /* FS2104 */
#define FS210X_REG_MAX			0xF8
#define FS210X_INIT_SCENE		0
#define FS210X_DEFAULT_SCENE		1
#define FS210X_START_DELAY_MS		5
#define FS210X_FAULT_CHECK_INTERVAL_MS	2000
#define FS2105S_RATES			(SNDRV_PCM_RATE_32000 | \
					 SNDRV_PCM_RATE_44100 | \
					 SNDRV_PCM_RATE_48000 | \
					 SNDRV_PCM_RATE_88200 | \
					 SNDRV_PCM_RATE_96000)
#define FS210X_RATES			(SNDRV_PCM_RATE_16000 | FS2105S_RATES)
#define FS210X_FORMATS			(SNDRV_PCM_FMTBIT_S16_LE | \
					 SNDRV_PCM_FMTBIT_S24_LE | \
					 SNDRV_PCM_FMTBIT_S24_3LE | \
					 SNDRV_PCM_FMTBIT_S32_LE)
#define FS210X_NUM_SUPPLIES		ARRAY_SIZE(fs210x_supply_names)

static const char *const fs210x_supply_names[] = {
	"pvdd",
	"dvdd",
};

struct fs210x_platform_data {
	const char *fwm_name;
};

struct fs210x_priv {
	struct i2c_client *i2c;
	struct device *dev;
	struct regmap *regmap;
	struct fs210x_platform_data pdata;
	struct regulator_bulk_data supplies[FS210X_NUM_SUPPLIES];
	struct gpio_desc *gpio_sdz;
	struct delayed_work start_work;
	struct delayed_work fault_check_work;
	struct fs_amp_lib amp_lib;
	const struct fs_amp_scene *cur_scene;
	struct clk *clk_bclk;
	/*
	 * @lock: Mutex ensuring exclusive access for critical device operations
	 *
	 * This lock serializes access between the following actions:
	 *  - Device initialization procedures(probe)
	 *  - Enable/disable device(DAPM event)
	 *  - Suspend/resume device(PM)
	 *  - Runtime scene switching(control)
	 *  - Scheduling/execution of delayed works items(delayed works)
	 */
	struct mutex lock;
	unsigned int check_interval_ms;
	unsigned int bclk;
	unsigned int srate;
	int scene_id;
	u16 devid;
	bool is_inited;
	bool is_suspended;
	bool is_bclk_on;
	bool is_playing;
};

static const unsigned int fs2105s_rates[] = {
	32000, 44100, 48000, 88200, 96000
};

static const struct snd_pcm_hw_constraint_list fs2105s_constraints = {
	.count = ARRAY_SIZE(fs2105s_rates),
	.list  = fs2105s_rates,
};

static const unsigned int fs210x_rates[] = {
	16000, 32000, 44100, 48000, 88200, 96000
};

static const struct snd_pcm_hw_constraint_list fs210x_constraints = {
	.count = ARRAY_SIZE(fs210x_rates),
	.list  = fs210x_rates,
};

static const struct fs_pll_div fs210x_pll_div[] = {
	/*    bclk,   pll1,   pll2,   pll3 */
	{   512000, 0x006C, 0x0120, 0x0001 },
	{   768000, 0x016C, 0x00C0, 0x0001 },
	{  1024000, 0x016C, 0x0090, 0x0001 },
	{  1536000, 0x016C, 0x0060, 0x0001 },
	{  2048000, 0x016C, 0x0090, 0x0002 },
	{  2304000, 0x016C, 0x0080, 0x0002 },
	{  3072000, 0x016C, 0x0090, 0x0003 },
	{  4096000, 0x016C, 0x0090, 0x0004 },
	{  4608000, 0x016C, 0x0080, 0x0004 },
	{  6144000, 0x016C, 0x0090, 0x0006 },
	{  8192000, 0x016C, 0x0090, 0x0008 },
	{  9216000, 0x016C, 0x0090, 0x0009 },
	{ 12288000, 0x016C, 0x0090, 0x000C },
	{ 16384000, 0x016C, 0x0090, 0x0010 },
	{ 18432000, 0x016C, 0x0090, 0x0012 },
	{ 24576000, 0x016C, 0x0090, 0x0018 },
	{  1411200, 0x016C, 0x0060, 0x0001 },
	{  2116800, 0x016C, 0x0080, 0x0002 },
	{  2822400, 0x016C, 0x0090, 0x0003 },
	{  4233600, 0x016C, 0x0080, 0x0004 },
	{  5644800, 0x016C, 0x0090, 0x0006 },
	{  8467200, 0x016C, 0x0090, 0x0009 },
	{ 11289600, 0x016C, 0x0090, 0x000C },
	{ 16934400, 0x016C, 0x0090, 0x0012 },
	{ 22579200, 0x016C, 0x0090, 0x0018 },
	{  2000000, 0x017C, 0x0093, 0x0002 },
};

static int fs210x_bclk_set(struct fs210x_priv *fs210x, bool on)
{
	int ret = 0;

	if (!fs210x || !fs210x->dev)
		return -EINVAL;

	if ((fs210x->is_bclk_on ^ on) == 0)
		return 0;

	if (on) {
		clk_set_rate(fs210x->clk_bclk, fs210x->bclk);
		ret = clk_prepare_enable(fs210x->clk_bclk);
		fs210x->is_bclk_on = true;
		fsleep(2000); /* >= 2ms */
	} else {
		clk_disable_unprepare(fs210x->clk_bclk);
		fs210x->is_bclk_on = false;
	}

	return ret;
}

static int fs210x_reg_write(struct fs210x_priv *fs210x,
			    u8 reg, u16 val)
{
	int ret;

	ret = regmap_write(fs210x->regmap, reg, val);
	if (ret) {
		dev_err(fs210x->dev, "Failed to write %02Xh: %d\n", reg, ret);
		return ret;
	}

	return 0;
}

static int fs210x_reg_read(struct fs210x_priv *fs210x,
			   u8 reg, u16 *pval)
{
	unsigned int val;
	int ret;

	ret = regmap_read(fs210x->regmap, reg, &val);
	if (ret) {
		dev_err(fs210x->dev, "Failed to read %02Xh: %d\n", reg, ret);
		return ret;
	}

	*pval = (u16)val;

	return 0;
}

static int fs210x_reg_update_bits(struct fs210x_priv *fs210x,
				  u8 reg, u16 mask, u16 val)
{
	int ret;

	ret = regmap_update_bits(fs210x->regmap, reg, mask, val);
	if (ret) {
		dev_err(fs210x->dev, "Failed to update %02Xh: %d\n", reg, ret);
		return ret;
	}

	return 0;
}

static int fs210x_reg_bulk_write(struct fs210x_priv *fs210x,
				 u8 reg, const void *val, u32 size)
{
	int ret;

	ret = regmap_bulk_write(fs210x->regmap, reg, val, size / 2);
	if (ret) {
		dev_err(fs210x->dev, "Failed to bulk write %02Xh: %d\n",
			reg, ret);
		return ret;
	}

	return 0;
}

static inline int fs210x_write_reg_val(struct fs210x_priv *fs210x,
				       const struct fs_reg_val *regv)
{
	return fs210x_reg_write(fs210x, regv->reg, regv->val);
}

static inline int fs210x_write_reg_bits(struct fs210x_priv *fs210x,
					const struct fs_reg_bits *regu)
{
	return fs210x_reg_update_bits(fs210x,
				      regu->reg,
				      regu->mask,
				      regu->val);
}

static inline int fs210x_set_cmd_pkg(struct fs210x_priv *fs210x,
				     const struct fs_cmd_pkg *pkg,
				     unsigned int *offset)
{
	int delay_us;

	if (pkg->cmd >= 0x00 && pkg->cmd <= FS210X_REG_MAX) {
		*offset = sizeof(pkg->regv);
		return fs210x_write_reg_val(fs210x, &pkg->regv);
	} else if (pkg->cmd == FS_CMD_UPDATE) {
		*offset = sizeof(pkg->regb);
		return fs210x_write_reg_bits(fs210x, &pkg->regb);
	} else if (pkg->cmd == FS_CMD_DELAY) {
		if (pkg->regv.val > FS_CMD_DELAY_MS_MAX)
			return -EOPNOTSUPP;
		delay_us = pkg->regv.val * 1000; /* ms -> us */
		fsleep(delay_us);
		*offset = sizeof(pkg->regv);
		return 0;
	}

	dev_err(fs210x->dev, "Invalid pkg cmd: %d\n", pkg->cmd);

	return -EOPNOTSUPP;
}

static int fs210x_reg_write_table(struct fs210x_priv *fs210x,
				  const struct fs_reg_table *reg)
{
	const struct fs_cmd_pkg *pkg;
	unsigned int index, offset;
	int ret;

	if (!fs210x || !fs210x->dev)
		return -EINVAL;

	if (!reg || reg->size == 0)
		return -EFAULT;

	for (index = 0; index < reg->size; index += offset) {
		pkg = (struct fs_cmd_pkg *)(reg->buf + index);
		ret = fs210x_set_cmd_pkg(fs210x, pkg, &offset);
		if (ret) {
			dev_err(fs210x->dev, "Failed to set cmd pkg: %02X-%d\n",
				pkg->cmd, ret);
			return ret;
		}
	}

	if (index != reg->size) {
		dev_err(fs210x->dev, "Invalid reg table size: %d-%d\n",
			index, reg->size);
		return -EFAULT;
	}

	return 0;
}

static int fs210x_dev_play(struct fs210x_priv *fs210x)
{
	int ret;

	if (!fs210x->is_inited)
		return -EFAULT;

	if (fs210x->is_playing)
		return 0;

	ret = fs210x_reg_write(fs210x, FS210X_11H_SYSCTRL,
			       FS210X_11H_DPS_PLAY);
	if (!ret)
		fs210x->is_playing = true;

	fsleep(10000); /* >= 10ms */

	return ret;
}

static int fs210x_dev_stop(struct fs210x_priv *fs210x)
{
	int ret;

	if (!fs210x->is_inited)
		return -EFAULT;

	if (!fs210x->is_playing)
		return 0;

	ret = fs210x_reg_write(fs210x, FS210X_11H_SYSCTRL,
			       FS210X_11H_DPS_PWDN);
	fs210x->is_playing = false;

	fsleep(30000); /* >= 30ms */

	return ret;
}

static int fs210x_set_reg_table(struct fs210x_priv *fs210x,
				const struct fs_amp_scene *scene)
{
	const struct fs_amp_scene *cur_scene;
	const struct fs_reg_table *reg;

	if (!fs210x || !fs210x->dev || !scene)
		return -EINVAL;

	cur_scene = fs210x->cur_scene;
	if (!scene->reg || cur_scene == scene) {
		dev_dbg(fs210x->dev, "Skip writing reg table\n");
		return 0;
	}

	reg = scene->reg;
	dev_dbg(fs210x->dev, "reg table size: %d\n", reg->size);

	return fs210x_reg_write_table(fs210x, reg);
}

static int fs210x_set_woofer_table(struct fs210x_priv *fs210x)
{
	const struct fs_file_table *woofer;
	const struct fs_fwm_table *table;
	int ret;

	if (!fs210x || !fs210x->dev)
		return -EINVAL;

	/* NOTE: fs2105s has woofer ram only */
	if (fs210x->devid != FS2105S_DEVICE_ID)
		return 0;

	table = fs210x->amp_lib.table[FS_INDEX_WOOFER];
	if (!table) {
		dev_dbg(fs210x->dev, "Skip writing woofer table\n");
		return 0;
	}

	woofer = (struct fs_file_table *)table->buf;
	dev_dbg(fs210x->dev, "woofer table size: %d\n", woofer->size);
	/* Unit of woofer data is u32(4 bytes) */
	if (woofer->size == 0 || (woofer->size & 0x3)) {
		dev_err(fs210x->dev, "Invalid woofer size: %d\n",
			woofer->size);
		return -EINVAL;
	}

	ret = fs210x_reg_write(fs210x, FS210X_46H_DACEQA,
			       FS2105S_46H_CAM_BURST_W);
	ret |= fs210x_reg_bulk_write(fs210x, FS210X_42H_DACEQWL,
				     woofer->buf, woofer->size);

	return ret;
}

static int fs210x_set_effect_table(struct fs210x_priv *fs210x,
				   const struct fs_amp_scene *scene)
{
	const struct fs_amp_scene *cur_scene;
	const struct fs_file_table *effect;
	int half_size;
	int ret;

	if (!fs210x || !fs210x->dev || !scene)
		return -EINVAL;

	cur_scene = fs210x->cur_scene;
	if (!scene->effect || cur_scene == scene) {
		dev_dbg(fs210x->dev, "Skip writing effect table\n");
		return 0;
	}

	effect = scene->effect;
	dev_dbg(fs210x->dev, "effect table size: %d\n", effect->size);

	/* Unit of effect data is u32(4 bytes), 2 channels */
	if (effect->size == 0 || (effect->size & 0x7)) {
		dev_err(fs210x->dev, "Invalid effect size: %d\n",
			effect->size);
		return -EINVAL;
	}

	half_size = effect->size / 2;

	/* Left channel */
	ret = fs210x_reg_write(fs210x, FS210X_46H_DACEQA,
			       FS210X_46H_CAM_BURST_L);
	ret |= fs210x_reg_bulk_write(fs210x, FS210X_42H_DACEQWL,
				     effect->buf, half_size);
	if (ret)
		return ret;

	/* Right channel */
	ret = fs210x_reg_write(fs210x, FS210X_46H_DACEQA,
			       FS210X_46H_CAM_BURST_R);
	ret |= fs210x_reg_bulk_write(fs210x, FS210X_42H_DACEQWL,
				     effect->buf + half_size, half_size);

	return ret;
}

static int fs210x_access_dsp_ram(struct fs210x_priv *fs210x, bool enable)
{
	int ret;

	if (!fs210x || !fs210x->dev)
		return -EINVAL;

	if (enable) {
		ret = fs210x_reg_write(fs210x, FS210X_11H_SYSCTRL,
				       FS210X_11H_DPS_HIZ);
		ret |= fs210x_reg_write(fs210x, FS210X_0BH_ACCKEY,
					FS210X_0BH_ACCKEY_ON);
	} else {
		ret = fs210x_reg_write(fs210x, FS210X_0BH_ACCKEY,
				       FS210X_0BH_ACCKEY_OFF);
		ret |= fs210x_reg_write(fs210x, FS210X_11H_SYSCTRL,
					FS210X_11H_DPS_PWDN);
	}

	fsleep(10000); /* >= 10ms */

	return ret;
}

static int fs210x_write_dsp_effect(struct fs210x_priv *fs210x,
				   const struct fs_amp_scene *scene,
				   int scene_id)
{
	int ret;

	if (!fs210x || !scene)
		return -EINVAL;

	ret = fs210x_access_dsp_ram(fs210x, true);
	if (ret) {
		dev_err(fs210x->dev, "Failed to access dsp: %d\n", ret);
		goto tag_exit;
	}

	ret = fs210x_set_effect_table(fs210x, scene);
	if (ret) {
		dev_err(fs210x->dev, "Failed to set effect: %d\n", ret);
		goto tag_exit;
	}

	if (scene_id == FS210X_INIT_SCENE)
		ret = fs210x_set_woofer_table(fs210x);

tag_exit:
	fs210x_reg_write(fs210x, FS210X_46H_DACEQA,
			 FS210X_46H_CAM_CLEAR);
	fs210x_access_dsp_ram(fs210x, false);

	return ret;
}

static int fs210x_check_scene(struct fs210x_priv *fs210x,
			      int scene_id, bool *skip_set)
{
	struct fs_amp_lib *amp_lib;

	if (!fs210x || !skip_set)
		return -EINVAL;

	amp_lib = &fs210x->amp_lib;
	if (amp_lib->scene_count == 0 || !amp_lib->scene) {
		dev_err(fs210x->dev, "There's no scene data\n");
		return -EINVAL;
	}

	if (scene_id < 0 || scene_id >= amp_lib->scene_count) {
		dev_err(fs210x->dev, "Invalid scene_id: %d\n", scene_id);
		return -EINVAL;
	}

	if (fs210x->scene_id == scene_id) {
		dev_dbg(fs210x->dev, "Skip to set same scene\n");
		return 0;
	}

	*skip_set = false;

	return 0;
}

static int fs210x_set_scene(struct fs210x_priv *fs210x, int scene_id)
{
	const struct fs_amp_scene *scene;
	bool skip_set = true;
	bool is_playing;
	int ret;

	if (!fs210x || !fs210x->dev)
		return -EINVAL;

	ret = fs210x_check_scene(fs210x, scene_id, &skip_set);
	if (ret || skip_set)
		return ret;

	scene = fs210x->amp_lib.scene + scene_id;
	dev_info(fs210x->dev, "Switch scene.%d: %s\n",
		 scene_id, scene->name);

	is_playing = fs210x->is_playing;
	if (is_playing)
		fs210x_dev_stop(fs210x);

	ret = fs210x_set_reg_table(fs210x, scene);
	if (ret) {
		dev_err(fs210x->dev, "Failed to set reg: %d\n", ret);
		return ret;
	}

	ret = fs210x_write_dsp_effect(fs210x, scene, scene_id);
	if (ret) {
		dev_err(fs210x->dev, "Failed to write ram: %d\n", ret);
		return ret;
	}

	fs210x->cur_scene = scene;
	fs210x->scene_id  = scene_id;

	if (is_playing)
		fs210x_dev_play(fs210x);

	return 0;
}

static int fs210x_init_chip(struct fs210x_priv *fs210x)
{
	int scene_id;
	int ret;

	regcache_cache_bypass(fs210x->regmap, true);

	if (!fs210x->gpio_sdz) {
		/* Gpio is not found, i2c reset */
		ret = fs210x_reg_write(fs210x, FS210X_10H_PWRCTRL,
				       FS210X_10H_I2C_RESET);
		if (ret)
			goto tag_power_down;
	} else {
		/* gpio reset, deactivate */
		gpiod_set_value_cansleep(fs210x->gpio_sdz, 0);
	}

	fsleep(10000); /* >= 10ms */

	/* Backup scene id */
	scene_id = fs210x->scene_id;
	fs210x->scene_id = -1;

	/* Init registers/RAM by init scene */
	ret = fs210x_set_scene(fs210x, FS210X_INIT_SCENE);
	if (ret)
		goto tag_power_down;

	/*
	 * If the firmware has effect scene(s),
	 * we load effect scene by default scene or scene_id
	 */
	if (fs210x->amp_lib.scene_count > 1) {
		if (scene_id < FS210X_DEFAULT_SCENE)
			scene_id = FS210X_DEFAULT_SCENE;
		ret = fs210x_set_scene(fs210x, scene_id);
		if (ret)
			goto tag_power_down;
	}

tag_power_down:
	/* Power down the device */
	ret |= fs210x_reg_write(fs210x, FS210X_11H_SYSCTRL,
				FS210X_11H_DPS_PWDN);
	fsleep(10000); /* >= 10ms */

	regcache_cache_bypass(fs210x->regmap, false);
	if (!ret) {
		regcache_mark_dirty(fs210x->regmap);
		regcache_sync(fs210x->regmap);
		fs210x->is_inited = true;
	}

	return ret;
}

static int fs210x_set_i2s_params(struct fs210x_priv *fs210x)
{
	const struct fs_i2s_srate params[] = {
		{ 16000, 0x3 },
		{ 32000, 0x7 },
		{ 44100, 0x8 },
		{ 48000, 0x9 },
		{ 88200, 0xA },
		{ 96000, 0xB },
	};
	u16 val;
	int i, ret;

	for (i = 0; i < ARRAY_SIZE(params); i++) {
		if (params[i].srate != fs210x->srate)
			continue;
		val = params[i].i2ssr << FS210X_17H_I2SSR_SHIFT;
		ret = fs210x_reg_update_bits(fs210x,
					     FS210X_17H_I2SCTRL,
					     FS210X_17H_I2SSR_MASK,
					     val);
		return ret;
	}

	dev_err(fs210x->dev, "Invalid sample rate: %d\n", fs210x->srate);

	return -EINVAL;
}

static int fs210x_get_pll_div(struct fs210x_priv *fs210x,
			      const struct fs_pll_div **pll_div)
{
	int i;

	if (!fs210x || !pll_div)
		return -EINVAL;

	for (i = 0; i < ARRAY_SIZE(fs210x_pll_div); i++) {
		if (fs210x_pll_div[i].bclk != fs210x->bclk)
			continue;
		*pll_div = fs210x_pll_div + i;
		return 0;
	}

	dev_err(fs210x->dev, "No PLL table for bclk: %d\n", fs210x->bclk);

	return -EFAULT;
}

static int fs210x_set_hw_params(struct fs210x_priv *fs210x)
{
	const struct fs_pll_div *pll_div;
	int ret;

	ret = fs210x_set_i2s_params(fs210x);
	if (ret) {
		dev_err(fs210x->dev, "Failed to set i2s params: %d\n", ret);
		return ret;
	}

	/* Set pll params */
	ret = fs210x_get_pll_div(fs210x, &pll_div);
	if (ret)
		return ret;

	ret  = fs210x_reg_write(fs210x, FS210X_A1H_PLLCTRL1, pll_div->pll1);
	ret |= fs210x_reg_write(fs210x, FS210X_A2H_PLLCTRL2, pll_div->pll2);
	ret |= fs210x_reg_write(fs210x, FS210X_A3H_PLLCTRL3, pll_div->pll3);

	return ret;
}

static int fs210x_dai_startup(struct snd_pcm_substream *substream,
			      struct snd_soc_dai *dai)
{
	const struct snd_pcm_hw_constraint_list *list;
	struct fs210x_priv *fs210x;
	int ret;

	fs210x = snd_soc_component_get_drvdata(dai->component);
	if (!fs210x) {
		pr_err("dai_startup: fs210x is null\n");
		return -EINVAL;
	}

	if (!substream->runtime)
		return 0;

	ret = snd_pcm_hw_constraint_mask64(substream->runtime,
					   SNDRV_PCM_HW_PARAM_FORMAT,
					   FS210X_FORMATS);
	if (ret < 0) {
		dev_err(fs210x->dev,
			"Failed to set hw param format: %d\n", ret);
		return ret;
	}

	if (fs210x->devid == FS2105S_DEVICE_ID)
		list = &fs2105s_constraints;
	else
		list = &fs210x_constraints;

	ret = snd_pcm_hw_constraint_list(substream->runtime, 0,
					 SNDRV_PCM_HW_PARAM_RATE,
					 list);
	if (ret < 0) {
		dev_err(fs210x->dev,
			"Failed to set hw param rate: %d\n", ret);
		return ret;
	}

	return 0;
}

static int fs210x_dai_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
{
	struct fs210x_priv *fs210x;

	fs210x = snd_soc_component_get_drvdata(dai->component);

	switch (fmt & SND_SOC_DAIFMT_CLOCK_PROVIDER_MASK) {
	case SND_SOC_DAIFMT_CBC_CFC:
		/* Only supports consumer mode */
		break;
	default:
		dev_err(fs210x->dev, "Only supports consumer mode\n");
		return -EINVAL;
	}

	return 0;
}

static int fs210x_dai_hw_params(struct snd_pcm_substream *substream,
				struct snd_pcm_hw_params *params,
				struct snd_soc_dai *dai)
{
	struct fs210x_priv *fs210x;
	int chn_num;
	int ret;

	if (substream->stream != SNDRV_PCM_STREAM_PLAYBACK)
		return 0;

	fs210x = snd_soc_component_get_drvdata(dai->component);

	fs210x->srate = params_rate(params);
	fs210x->bclk  = snd_soc_params_to_bclk(params);
	chn_num = params_channels(params);
	if (chn_num == 1) /* mono */
		fs210x->bclk *= 2; /* I2S bus has 2 channels */

	/* The FS2105S can't support 16kHz sample rate. */
	if (fs210x->devid == FS2105S_DEVICE_ID && fs210x->srate == 16000)
		return -EOPNOTSUPP;

	mutex_lock(&fs210x->lock);
	ret = fs210x_set_hw_params(fs210x);
	mutex_unlock(&fs210x->lock);
	if (ret)
		dev_err(fs210x->dev, "Failed to set hw params: %d\n", ret);

	return ret;
}

static int fs210x_dai_mute(struct snd_soc_dai *dai, int mute, int stream)
{
	struct fs210x_priv *fs210x;
	unsigned long delay;

	if (stream != SNDRV_PCM_STREAM_PLAYBACK)
		return 0;

	fs210x = snd_soc_component_get_drvdata(dai->component);

	mutex_lock(&fs210x->lock);

	if (!fs210x->is_inited || fs210x->is_suspended) {
		mutex_unlock(&fs210x->lock);
		return 0;
	}

	mutex_unlock(&fs210x->lock);

	if (mute) {
		cancel_delayed_work_sync(&fs210x->fault_check_work);
		cancel_delayed_work_sync(&fs210x->start_work);
	} else {
		delay = msecs_to_jiffies(fs210x->check_interval_ms);
		schedule_delayed_work(&fs210x->fault_check_work, delay);
	}

	return 0;
}

static int fs210x_dai_trigger(struct snd_pcm_substream *substream,
			      int cmd, struct snd_soc_dai *dai)
{
	struct fs210x_priv *fs210x;

	fs210x = snd_soc_component_get_drvdata(dai->component);

	mutex_lock(&fs210x->lock);

	if (!fs210x->is_inited || fs210x->is_suspended || fs210x->is_playing) {
		mutex_unlock(&fs210x->lock);
		return 0;
	}

	mutex_unlock(&fs210x->lock);

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	case SNDRV_PCM_TRIGGER_RESUME:
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
		/*
		 * According to the power up/down sequence of FS210x,
		 * it requests the I2S clock has been present
		 * and stable(>= 2ms) before playing.
		 */
		schedule_delayed_work(&fs210x->start_work,
				      msecs_to_jiffies(FS210X_START_DELAY_MS));
		break;

	default:
		break;
	}

	return 0;
}

static void fs210x_start_work(struct work_struct *work)
{
	struct fs210x_priv *fs210x;
	int ret;

	fs210x = container_of(work, struct fs210x_priv, start_work.work);

	mutex_lock(&fs210x->lock);

	ret = fs210x_dev_play(fs210x);
	if (ret)
		dev_err(fs210x->dev, "Failed to start playing: %d\n", ret);

	mutex_unlock(&fs210x->lock);
}

static void fs210x_fault_check_work(struct work_struct *work)
{
	struct fs210x_priv *fs210x;
	u16 status;
	int ret;

	fs210x = container_of(work, struct fs210x_priv, fault_check_work.work);

	mutex_lock(&fs210x->lock);

	if (!fs210x->is_inited || fs210x->is_suspended || !fs210x->is_playing) {
		mutex_unlock(&fs210x->lock);
		return;
	}

	ret = fs210x_reg_read(fs210x, FS210X_05H_ANASTAT, &status);
	mutex_unlock(&fs210x->lock);
	if (ret)
		return;

	if (!(status & FS210X_05H_PVDD_MASK))
		dev_err(fs210x->dev, "PVDD fault\n");
	if (status & FS210X_05H_OCDL_MASK)
		dev_err(fs210x->dev, "OC detected\n");
	if (status & FS210X_05H_UVDL_MASK)
		dev_err(fs210x->dev, "UV detected\n");
	if (status & FS210X_05H_OVDL_MASK)
		dev_err(fs210x->dev, "OV detected\n");
	if (status & FS210X_05H_OTPDL_MASK)
		dev_err(fs210x->dev, "OT detected\n");
	if (status & FS210X_05H_OCRDL_MASK)
		dev_err(fs210x->dev, "OCR detected\n");
	if (status & FS210X_05H_OCLDL_MASK)
		dev_err(fs210x->dev, "OCL detected\n");
	if (status & FS210X_05H_DCRDL_MASK)
		dev_err(fs210x->dev, "DCR detected\n");
	if (status & FS210X_05H_DCLDL_MASK)
		dev_err(fs210x->dev, "DCL detected\n");
	if (status & FS210X_05H_SRDL_MASK)
		dev_err(fs210x->dev, "SR detected\n");
	if (status & FS210X_05H_OTWDL_MASK)
		dev_err(fs210x->dev, "OTW detected\n");
	if (!(status & FS210X_05H_AMPS_MASK))
		dev_dbg(fs210x->dev, "Amplifier unready\n");
	if (!(status & FS210X_05H_PLLS_MASK))
		dev_err(fs210x->dev, "PLL unlock\n");
	if (!(status & FS210X_05H_ANAS_MASK))
		dev_err(fs210x->dev, "Analog power fault\n");

	schedule_delayed_work(&fs210x->fault_check_work,
			      msecs_to_jiffies(fs210x->check_interval_ms));
}

static int fs210x_get_drvdata_from_kctrl(struct snd_kcontrol *kctrl,
					 struct fs210x_priv **fs210x)
{
	struct snd_soc_component *cmpnt;

	if (!kctrl) {
		pr_err("fs210x: kcontrol is null\n");
		return -EINVAL;
	}

	cmpnt = snd_soc_kcontrol_component(kctrl);
	if (!cmpnt) {
		pr_err("fs210x: component is null\n");
		return -EINVAL;
	}

	*fs210x = snd_soc_component_get_drvdata(cmpnt);

	return 0;
}

static int fs210x_effect_scene_info(struct snd_kcontrol *kcontrol,
				    struct snd_ctl_elem_info *uinfo)
{
	const struct fs_amp_scene *scene;
	struct fs210x_priv *fs210x;
	const char *name = "N/A";
	int idx, count;
	int ret;

	ret = fs210x_get_drvdata_from_kctrl(kcontrol, &fs210x);
	if (ret || !fs210x->dev) {
		pr_err("scene_effect_info: fs210x is null\n");
		return -EINVAL;
	}

	uinfo->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
	uinfo->count = 1;

	count = fs210x->amp_lib.scene_count - 1; /* Skip init scene */
	if (count < 1) {
		uinfo->value.enumerated.items = 0;
		return 0;
	}

	uinfo->value.enumerated.items = count;
	if (uinfo->value.enumerated.item >= count)
		uinfo->value.enumerated.item = count - 1;

	idx = uinfo->value.enumerated.item;
	scene = fs210x->amp_lib.scene + idx + 1;
	if (scene->name)
		name = scene->name;

	strscpy(uinfo->value.enumerated.name, name, strlen(name) + 1);

	return 0;
}

static int fs210x_effect_scene_get(struct snd_kcontrol *kcontrol,
				   struct snd_ctl_elem_value *ucontrol)
{
	struct fs210x_priv *fs210x;
	int index;
	int ret;

	ret = fs210x_get_drvdata_from_kctrl(kcontrol, &fs210x);
	if (ret || !fs210x->dev) {
		pr_err("scene_effect_get: fs210x is null\n");
		return -EINVAL;
	}

	/* The id of effect scene is from 1 to N. */
	if (fs210x->scene_id < 1)
		return -EINVAL;

	mutex_lock(&fs210x->lock);
	/*
	 * FS210x has scene(s) as below:
	 * init scene: id = 0
	 * effect scene(s): id = 1~N (optional)
	 * effect_index = scene_id - 1
	 */
	index = fs210x->scene_id - 1;
	ucontrol->value.integer.value[0] = index;
	mutex_unlock(&fs210x->lock);

	return 0;
}

static int fs210x_effect_scene_put(struct snd_kcontrol *kcontrol,
				   struct snd_ctl_elem_value *ucontrol)
{
	struct fs210x_priv *fs210x;
	int scene_id, scene_count;
	bool is_changed = false;
	int ret;

	ret = fs210x_get_drvdata_from_kctrl(kcontrol, &fs210x);
	if (ret || !fs210x->dev) {
		pr_err("scene_effect_put: fs210x is null\n");
		return -EINVAL;
	}

	mutex_lock(&fs210x->lock);

	/*
	 * FS210x has scene(s) as below:
	 * init scene: id = 0 (It's set in fs210x_init_chip() only)
	 * effect scene(s): id = 1~N (optional)
	 * scene_id = effect_index + 1.
	 */
	scene_id = ucontrol->value.integer.value[0] + 1;
	scene_count = fs210x->amp_lib.scene_count - 1; /* Skip init scene */
	if (scene_id < 1 || scene_id > scene_count) {
		mutex_unlock(&fs210x->lock);
		return -ERANGE;
	}

	if (scene_id != fs210x->scene_id)
		is_changed = true;

	if (fs210x->is_suspended) {
		fs210x->scene_id = scene_id;
		mutex_unlock(&fs210x->lock);
		return is_changed;
	}

	ret = fs210x_set_scene(fs210x, scene_id);
	if (ret)
		dev_err(fs210x->dev, "Failed to set scene: %d\n", ret);

	mutex_unlock(&fs210x->lock);

	if (!ret && is_changed)
		return 1;

	return ret;
}

static int fs210x_playback_event(struct snd_soc_dapm_widget *w,
				 struct snd_kcontrol *kc, int event)
{
	struct snd_soc_component *cmpnt = snd_soc_dapm_to_component(w->dapm);
	struct fs210x_priv *fs210x = snd_soc_component_get_drvdata(cmpnt);
	int ret = 0;

	mutex_lock(&fs210x->lock);

	if (fs210x->is_suspended) {
		mutex_unlock(&fs210x->lock);
		return 0;
	}

	switch (event) {
	case SND_SOC_DAPM_PRE_PMU:
		/*
		 * If there is no bclk for us to set the clock output,
		 * we will enable the device(start_work) in dai trigger.
		 */
		if (!fs210x->clk_bclk)
			break;
		fs210x_bclk_set(fs210x, true);
		ret = fs210x_dev_play(fs210x);
		break;
	case SND_SOC_DAPM_POST_PMD:
		ret = fs210x_dev_stop(fs210x);
		fs210x_bclk_set(fs210x, false);
		break;
	default:
		break;
	}

	mutex_unlock(&fs210x->lock);

	return ret;
}

static const struct snd_soc_dai_ops fs210x_dai_ops = {
	.startup		= fs210x_dai_startup,
	.set_fmt		= fs210x_dai_set_fmt,
	.hw_params		= fs210x_dai_hw_params,
	.mute_stream		= fs210x_dai_mute,
	.trigger		= fs210x_dai_trigger,
};

static const struct snd_soc_dai_driver fs210x_dai = {
	.name = FS210X_DEFAULT_DAI_NAME,
	.playback = {
		.stream_name = "Playback",
		.channels_min = 1,
		.channels_max = 2,
		.rates = FS210X_RATES,
		.formats = FS210X_FORMATS,
	},
	.capture = {
		.stream_name = "Capture",
		.channels_min = 1,
		.channels_max = 2,
		.rates = FS210X_RATES,
		.formats = FS210X_FORMATS,
	},
	.ops = &fs210x_dai_ops,
	.symmetric_rate = 1,
	.symmetric_sample_bits = 1,
};

static const DECLARE_TLV_DB_SCALE(fs2105s_vol_tlv, -9709, 19, 1);
static const DECLARE_TLV_DB_SCALE(fs210x_vol_tlv, -13357, 19, 1);

static const struct snd_kcontrol_new fs2105s_vol_control[] = {
	SOC_DOUBLE_R_TLV("PCM Playback Volume",
			 FS210X_39H_LVOLCTRL, FS210X_3AH_RVOLCTRL,
			 7, 0x1FF, 0, fs2105s_vol_tlv),
};

static const struct snd_kcontrol_new fs210x_vol_control[] = {
	SOC_DOUBLE_R_TLV("PCM Playback Volume",
			 FS210X_39H_LVOLCTRL, FS210X_3AH_RVOLCTRL,
			 6, 0x2BF, 0, fs210x_vol_tlv),
};

static const struct snd_kcontrol_new fs210x_controls[] = {
	SOC_DOUBLE("DAC Mute Switch", FS210X_30H_DACCTRL, 4, 8, 1, 0),
	SOC_DOUBLE("DAC Fade Switch", FS210X_30H_DACCTRL, 5, 9, 1, 0),
};

static const struct snd_kcontrol_new fs210x_scene_control[] = {
	FS_SOC_ENUM_EXT("Effect Scene",
			fs210x_effect_scene_info,
			fs210x_effect_scene_get,
			fs210x_effect_scene_put),
};

static const struct snd_soc_dapm_widget fs210x_dapm_widgets[] = {
	SND_SOC_DAPM_AIF_IN_E("AIF IN", "Playback", 0, SND_SOC_NOPM, 0, 0,
			      fs210x_playback_event,
			      SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD),
	SND_SOC_DAPM_AIF_OUT("AIF OUT", "Capture", 0, SND_SOC_NOPM, 0, 0),
	SND_SOC_DAPM_OUTPUT("OUTL"),
	SND_SOC_DAPM_OUTPUT("OUTR"),
	SND_SOC_DAPM_INPUT("SDO"),
};

static const struct snd_soc_dapm_route fs210x_dapm_routes[] = {
	{ "OUTL", NULL, "AIF IN" },
	{ "OUTR", NULL, "AIF IN" },
	{ "AIF OUT", NULL, "SDO" },
};

static int fs210x_add_mixer_controls(struct fs210x_priv *fs210x,
				     struct snd_soc_component *cmpnt)
{
	const struct snd_kcontrol_new *kctrl;
	int count;
	int ret;

	if (!fs210x || !cmpnt)
		return -EINVAL;

	if (fs210x->devid == FS2105S_DEVICE_ID) {
		kctrl = fs2105s_vol_control;
		count = ARRAY_SIZE(fs2105s_vol_control);
	} else {
		kctrl = fs210x_vol_control;
		count = ARRAY_SIZE(fs210x_vol_control);
	}

	ret = snd_soc_add_component_controls(cmpnt, kctrl, count);
	if (ret)
		return ret;

	/*
	 * If the firmware has no scene or only init scene,
	 * we skip adding this mixer control.
	 */
	if (fs210x->amp_lib.scene_count < 2)
		return 0;

	kctrl = fs210x_scene_control;
	count = ARRAY_SIZE(fs210x_scene_control);

	return snd_soc_add_component_controls(cmpnt, kctrl, count);
}

static int fs210x_probe(struct snd_soc_component *cmpnt)
{
	struct fs210x_priv *fs210x;
	int ret;

	fs210x = snd_soc_component_get_drvdata(cmpnt);
	if (!fs210x || !fs210x->dev)
		return -EINVAL;

	fs210x->amp_lib.dev   = fs210x->dev;
	fs210x->amp_lib.devid = fs210x->devid;

	ret = fs_amp_load_firmware(&fs210x->amp_lib, fs210x->pdata.fwm_name);
	if (ret)
		return ret;

	ret = fs210x_add_mixer_controls(fs210x, cmpnt);
	if (ret)
		return ret;

	mutex_lock(&fs210x->lock);
	ret = fs210x_init_chip(fs210x);
	mutex_unlock(&fs210x->lock);

	return ret;
}

static void fs210x_remove(struct snd_soc_component *cmpnt)
{
	struct fs210x_priv *fs210x;

	fs210x = snd_soc_component_get_drvdata(cmpnt);
	if (!fs210x || !fs210x->dev)
		return;

	cancel_delayed_work_sync(&fs210x->start_work);
	cancel_delayed_work_sync(&fs210x->fault_check_work);
}

#ifdef CONFIG_PM
static int fs210x_suspend(struct snd_soc_component *cmpnt)
{
	struct fs210x_priv *fs210x;
	int ret;

	fs210x = snd_soc_component_get_drvdata(cmpnt);
	if (!fs210x || !fs210x->dev)
		return -EINVAL;

	regcache_cache_only(fs210x->regmap, true);

	mutex_lock(&fs210x->lock);
	fs210x->cur_scene = NULL;
	fs210x->is_inited = false;
	fs210x->is_playing = false;
	fs210x->is_suspended = true;

	gpiod_set_value_cansleep(fs210x->gpio_sdz, 1); /* Active */
	fsleep(30000); /* >= 30ms */
	mutex_unlock(&fs210x->lock);

	cancel_delayed_work_sync(&fs210x->start_work);
	cancel_delayed_work_sync(&fs210x->fault_check_work);

	ret = regulator_bulk_disable(FS210X_NUM_SUPPLIES, fs210x->supplies);
	if (ret) {
		dev_err(fs210x->dev, "Failed to suspend: %d\n", ret);
		return ret;
	}

	return 0;
}

static int fs210x_resume(struct snd_soc_component *cmpnt)
{
	struct fs210x_priv *fs210x;
	int ret;

	fs210x = snd_soc_component_get_drvdata(cmpnt);
	if (!fs210x || !fs210x->dev)
		return -EINVAL;

	ret = regulator_bulk_enable(FS210X_NUM_SUPPLIES, fs210x->supplies);
	if (ret) {
		dev_err(fs210x->dev, "Failed to enable supplies: %d\n", ret);
		return ret;
	}

	mutex_lock(&fs210x->lock);

	fs210x->is_suspended = false;
	ret = fs210x_init_chip(fs210x);

	mutex_unlock(&fs210x->lock);

	return ret;
}
#else
#define fs210x_suspend NULL
#define fs210x_resume NULL
#endif // CONFIG_PM

static bool fs210x_volatile_registers(struct device *dev, unsigned int reg)
{
	switch (reg) {
	case FS210X_00H_STATUS ... FS210X_0FH_I2CADDR:
	case FS210X_ABH_INTSTAT:
	case FS210X_ACH_INTSTATR:
		return true;
	default:
		return false;
	}
}

static const struct snd_soc_component_driver fs210x_soc_component_dev = {
	.probe			= fs210x_probe,
	.remove			= fs210x_remove,
	.suspend		= fs210x_suspend,
	.resume			= fs210x_resume,
	.controls		= fs210x_controls,
	.num_controls		= ARRAY_SIZE(fs210x_controls),
	.dapm_widgets		= fs210x_dapm_widgets,
	.num_dapm_widgets	= ARRAY_SIZE(fs210x_dapm_widgets),
	.dapm_routes		= fs210x_dapm_routes,
	.num_dapm_routes	= ARRAY_SIZE(fs210x_dapm_routes),
};

static const struct regmap_config fs210x_regmap = {
	.reg_bits		= 8,
	.val_bits		= 16,
	.max_register		= FS210X_REG_MAX,
	.val_format_endian	= REGMAP_ENDIAN_BIG,
	.cache_type		= REGCACHE_MAPLE,
	.volatile_reg		= fs210x_volatile_registers,
};

static int fs210x_detect_device(struct fs210x_priv *fs210x)
{
	u16 devid;
	int ret;

	ret = fs210x_reg_read(fs210x, FS210X_03H_DEVID, &devid);
	if (ret)
		return ret;

	fs210x->devid = HI_U16(devid);

	switch (fs210x->devid) {
	case FS210X_DEVICE_ID:
		dev_info(fs210x->dev, "FS2104 detected\n");
		break;
	case FS2105S_DEVICE_ID:
		dev_info(fs210x->dev, "FS2105S detected\n");
		break;
	default:
		dev_err(fs210x->dev, "DEVID: 0x%04X dismatch\n", devid);
		return -ENODEV;
	}

	return 0;
}

static int fs210x_parse_dts(struct fs210x_priv *fs210x,
			    struct fs210x_platform_data *pdata)
{
	struct device_node *node = fs210x->dev->of_node;
	int i, ret;

	if (!node)
		return 0;

	ret = of_property_read_string(node, "firmware-name", &pdata->fwm_name);
	if (ret)
		pdata->fwm_name = FS210X_DEFAULT_FWM_NAME;

	fs210x->gpio_sdz = devm_gpiod_get_optional(fs210x->dev,
						   "reset", GPIOD_OUT_HIGH);
	if (IS_ERR(fs210x->gpio_sdz))
		return dev_err_probe(fs210x->dev, PTR_ERR(fs210x->gpio_sdz),
				     "Failed to get reset-gpios\n");

	for (i = 0; i < FS210X_NUM_SUPPLIES; i++)
		fs210x->supplies[i].supply = fs210x_supply_names[i];

	ret = devm_regulator_bulk_get(fs210x->dev,
				      ARRAY_SIZE(fs210x->supplies),
				      fs210x->supplies);
	if (ret)
		return dev_err_probe(fs210x->dev, ret,
				     "Failed to get supplies\n");

	return 0;
}

static void fs210x_deinit(struct fs210x_priv *fs210x)
{
	gpiod_set_value_cansleep(fs210x->gpio_sdz, 1); /* Active */
	fsleep(10000); /* >= 10ms */

	regulator_bulk_disable(FS210X_NUM_SUPPLIES, fs210x->supplies);
}

static int fs210x_init(struct fs210x_priv *fs210x)
{
	int ret;

	ret = fs210x_parse_dts(fs210x, &fs210x->pdata);
	if (ret)
		return ret;

	fs210x->clk_bclk = devm_clk_get_optional(fs210x->dev, "bclk");
	if (IS_ERR(fs210x->clk_bclk))
		return dev_err_probe(fs210x->dev, PTR_ERR(fs210x->clk_bclk),
				     "Failed to get bclk\n");

	ret = regulator_bulk_enable(FS210X_NUM_SUPPLIES, fs210x->supplies);
	if (ret)
		return dev_err_probe(fs210x->dev, ret,
				     "Failed to enable supplies\n");

	/* Make sure the SDZ pin is pulled down enough time. */
	fsleep(10000); /* >= 10ms */
	gpiod_set_value_cansleep(fs210x->gpio_sdz, 0); /* Deactivate */
	fsleep(10000); /* >= 10ms */

	ret = fs210x_detect_device(fs210x);
	if (ret) {
		fs210x_deinit(fs210x);
		return ret;
	}

	fs210x->scene_id     = -1; /* Invalid scene */
	fs210x->cur_scene    = NULL;
	fs210x->is_playing   = false;
	fs210x->is_inited    = false;
	fs210x->is_suspended = false;
	fs210x->check_interval_ms = FS210X_FAULT_CHECK_INTERVAL_MS;

	INIT_DELAYED_WORK(&fs210x->fault_check_work, fs210x_fault_check_work);
	INIT_DELAYED_WORK(&fs210x->start_work, fs210x_start_work);
	mutex_init(&fs210x->lock);

	return 0;
}

static int fs210x_register_snd_component(struct fs210x_priv *fs210x)
{
	struct snd_soc_dai_driver *dai_drv;
	static int instance_id;
	int ret;

	dai_drv = devm_kmemdup(fs210x->dev, &fs210x_dai,
			       sizeof(fs210x_dai), GFP_KERNEL);
	if (!dai_drv)
		return -ENOMEM;

	dai_drv->name = devm_kasprintf(fs210x->dev,
				       GFP_KERNEL, "%s-%d",
				       dai_drv->name, instance_id);
	if (!dai_drv->name)
		return -ENOMEM;

	instance_id++;

	if (fs210x->devid == FS2105S_DEVICE_ID) {
		dai_drv->playback.rates = FS2105S_RATES;
		dai_drv->capture.rates  = FS2105S_RATES;
	}

	ret = snd_soc_register_component(fs210x->dev,
					 &fs210x_soc_component_dev,
					 dai_drv, 1);
	return ret;
}

static ssize_t check_interval_ms_show(struct device *dev,
				      struct device_attribute *devattr,
				      char *buf)
{
	struct fs210x_priv *fs210x = dev_get_drvdata(dev);

	return sysfs_emit(buf, "%d\n", fs210x->check_interval_ms);
}

static ssize_t check_interval_ms_store(struct device *dev,
				       struct device_attribute *devattr,
				       const char *buf,
				       size_t count)
{
	struct fs210x_priv *fs210x = dev_get_drvdata(dev);
	int ret;

	ret = kstrtouint(buf, 10, &fs210x->check_interval_ms);
	if (ret)
		return -EINVAL;

	return (ssize_t)count;
}

static DEVICE_ATTR_RW(check_interval_ms);

static struct attribute *fs210x_attrs[] = {
	&dev_attr_check_interval_ms.attr,
	NULL,
};

static struct attribute_group fs210x_attr_group = {
	.attrs = fs210x_attrs,
};

static int fs210x_i2c_probe(struct i2c_client *client)
{
	struct fs210x_priv *fs210x;
	int ret;

	fs210x = devm_kzalloc(&client->dev, sizeof(*fs210x), GFP_KERNEL);
	if (!fs210x)
		return -ENOMEM;

	fs210x->i2c = client;
	fs210x->dev = &client->dev;
	i2c_set_clientdata(client, fs210x);

	fs210x->regmap = devm_regmap_init_i2c(client, &fs210x_regmap);
	if (IS_ERR(fs210x->regmap))
		return dev_err_probe(fs210x->dev, PTR_ERR(fs210x->regmap),
				     "Failed to get regmap\n");

	ret = fs210x_init(fs210x);
	if (ret)
		return ret;

	ret = devm_device_add_group(fs210x->dev, &fs210x_attr_group);
	if (ret) {
		fs210x_deinit(fs210x);
		return dev_err_probe(fs210x->dev, ret,
				     "Failed to create sysfs group\n");
	}

	ret = fs210x_register_snd_component(fs210x);
	if (ret) {
		fs210x_deinit(fs210x);
		return dev_err_probe(fs210x->dev, ret,
				     "Failed to register component\n");
	}

	return 0;
}

static void fs210x_i2c_remove(struct i2c_client *client)
{
	struct fs210x_priv *fs210x = i2c_get_clientdata(client);

	snd_soc_unregister_component(fs210x->dev);
	fs210x_deinit(fs210x);
}

static const struct i2c_device_id fs210x_i2c_id[] = {
	{ "fs2104" },
	{ "fs2105s" },
	{}
};
MODULE_DEVICE_TABLE(i2c, fs210x_i2c_id);

static const struct of_device_id fs210x_of_match[] = {
	{ .compatible = "foursemi,fs2105s", },
	{},
};
MODULE_DEVICE_TABLE(of, fs210x_of_match);

static struct i2c_driver fs210x_i2c_driver = {
	.driver = {
		.name = "fs210x",
		.of_match_table = fs210x_of_match,
	},
	.id_table = fs210x_i2c_id,
	.probe    = fs210x_i2c_probe,
	.remove   = fs210x_i2c_remove,
};

module_i2c_driver(fs210x_i2c_driver);

MODULE_AUTHOR("Nick Li <nick.li@foursemi.com>");
MODULE_DESCRIPTION("FS2104/5S Audio Amplifier Driver");
MODULE_LICENSE("GPL");