// SPDX-License-Identifier: GPL-2.0-only
/*
 * max98925.c -- ALSA SoC Stereo MAX98925 driver
 * Copyright 2013-15 Maxim Integrated Products
 */
#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#include <linux/cdev.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/tlv.h>
#include "max98925.h"

static const char *const dai_text[] = {
        "Left", "Right", "LeftRight", "LeftRightDiv2",
};

static const char * const max98925_boost_voltage_text[] = {
        "8.5V", "8.25V", "8.0V", "7.75V", "7.5V", "7.25V", "7.0V", "6.75V",
        "6.5V", "6.5V", "6.5V", "6.5V", "6.5V", "6.5V", "6.5V", "6.5V"
};

static SOC_ENUM_SINGLE_DECL(max98925_boost_voltage,
        MAX98925_CONFIGURATION, M98925_BST_VOUT_SHIFT,
        max98925_boost_voltage_text);

static const char *const hpf_text[] = {
        "Disable", "DC Block", "100Hz", "200Hz", "400Hz", "800Hz",
};

static const struct reg_default max98925_reg[] = {
        { 0x0B, 0x00 }, /* IRQ Enable0 */
        { 0x0C, 0x00 }, /* IRQ Enable1 */
        { 0x0D, 0x00 }, /* IRQ Enable2 */
        { 0x0E, 0x00 }, /* IRQ Clear0 */
        { 0x0F, 0x00 }, /* IRQ Clear1 */
        { 0x10, 0x00 }, /* IRQ Clear2 */
        { 0x11, 0xC0 }, /* Map0 */
        { 0x12, 0x00 }, /* Map1 */
        { 0x13, 0x00 }, /* Map2 */
        { 0x14, 0xF0 }, /* Map3 */
        { 0x15, 0x00 }, /* Map4 */
        { 0x16, 0xAB }, /* Map5 */
        { 0x17, 0x89 }, /* Map6 */
        { 0x18, 0x00 }, /* Map7 */
        { 0x19, 0x00 }, /* Map8 */
        { 0x1A, 0x06 }, /* DAI Clock Mode 1 */
        { 0x1B, 0xC0 }, /* DAI Clock Mode 2 */
        { 0x1C, 0x00 }, /* DAI Clock Divider Denominator MSBs */
        { 0x1D, 0x00 }, /* DAI Clock Divider Denominator LSBs */
        { 0x1E, 0xF0 }, /* DAI Clock Divider Numerator MSBs */
        { 0x1F, 0x00 }, /* DAI Clock Divider Numerator LSBs */
        { 0x20, 0x50 }, /* Format */
        { 0x21, 0x00 }, /* TDM Slot Select */
        { 0x22, 0x00 }, /* DOUT Configuration VMON */
        { 0x23, 0x00 }, /* DOUT Configuration IMON */
        { 0x24, 0x00 }, /* DOUT Configuration VBAT */
        { 0x25, 0x00 }, /* DOUT Configuration VBST */
        { 0x26, 0x00 }, /* DOUT Configuration FLAG */
        { 0x27, 0xFF }, /* DOUT HiZ Configuration 1 */
        { 0x28, 0xFF }, /* DOUT HiZ Configuration 2 */
        { 0x29, 0xFF }, /* DOUT HiZ Configuration 3 */
        { 0x2A, 0xFF }, /* DOUT HiZ Configuration 4 */
        { 0x2B, 0x02 }, /* DOUT Drive Strength */
        { 0x2C, 0x90 }, /* Filters */
        { 0x2D, 0x00 }, /* Gain */
        { 0x2E, 0x02 }, /* Gain Ramping */
        { 0x2F, 0x00 }, /* Speaker Amplifier */
        { 0x30, 0x0A }, /* Threshold */
        { 0x31, 0x00 }, /* ALC Attack */
        { 0x32, 0x80 }, /* ALC Atten and Release */
        { 0x33, 0x00 }, /* ALC Infinite Hold Release */
        { 0x34, 0x92 }, /* ALC Configuration */
        { 0x35, 0x01 }, /* Boost Converter */
        { 0x36, 0x00 }, /* Block Enable */
        { 0x37, 0x00 }, /* Configuration */
        { 0x38, 0x00 }, /* Global Enable */
        { 0x3A, 0x00 }, /* Boost Limiter */
};

static const struct soc_enum max98925_dai_enum =
        SOC_ENUM_SINGLE(MAX98925_GAIN, 5, ARRAY_SIZE(dai_text), dai_text);

static const struct soc_enum max98925_hpf_enum =
        SOC_ENUM_SINGLE(MAX98925_FILTERS, 0, ARRAY_SIZE(hpf_text), hpf_text);

static const struct snd_kcontrol_new max98925_hpf_sel_mux =
        SOC_DAPM_ENUM("Rc Filter MUX Mux", max98925_hpf_enum);

static const struct snd_kcontrol_new max98925_dai_sel_mux =
        SOC_DAPM_ENUM("DAI IN MUX Mux", max98925_dai_enum);

static int max98925_dac_event(struct snd_soc_dapm_widget *w,
                struct snd_kcontrol *kcontrol, int event)
{
        struct snd_soc_component *component = snd_kcontrol_chip(kcontrol);
        struct max98925_priv *max98925 = snd_soc_component_get_drvdata(component);

        switch (event) {
        case SND_SOC_DAPM_PRE_PMU:
                regmap_update_bits(max98925->regmap,
                        MAX98925_BLOCK_ENABLE,
                        M98925_BST_EN_MASK |
                        M98925_ADC_IMON_EN_MASK | M98925_ADC_VMON_EN_MASK,
                        M98925_BST_EN_MASK |
                        M98925_ADC_IMON_EN_MASK | M98925_ADC_VMON_EN_MASK);
                break;
        case SND_SOC_DAPM_POST_PMD:
                regmap_update_bits(max98925->regmap,
                        MAX98925_BLOCK_ENABLE, M98925_BST_EN_MASK |
                        M98925_ADC_IMON_EN_MASK | M98925_ADC_VMON_EN_MASK, 0);
                break;
        default:
                return 0;
        }
        return 0;
}

static const struct snd_soc_dapm_widget max98925_dapm_widgets[] = {
        SND_SOC_DAPM_AIF_IN("DAI_OUT", "HiFi Playback", 0, SND_SOC_NOPM, 0, 0),
        SND_SOC_DAPM_MUX("DAI IN MUX", SND_SOC_NOPM, 0, 0,
                                &max98925_dai_sel_mux),
        SND_SOC_DAPM_MUX("Rc Filter MUX", SND_SOC_NOPM, 0, 0,
                                &max98925_hpf_sel_mux),
        SND_SOC_DAPM_DAC_E("Amp Enable", NULL, MAX98925_BLOCK_ENABLE,
                        M98925_SPK_EN_SHIFT, 0, max98925_dac_event,
                        SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD),
        SND_SOC_DAPM_SUPPLY("Global Enable", MAX98925_GLOBAL_ENABLE,
                        M98925_EN_SHIFT, 0, NULL, 0),
        SND_SOC_DAPM_OUTPUT("BE_OUT"),
};

static const struct snd_soc_dapm_route max98925_audio_map[] = {
        {"DAI IN MUX", "Left", "DAI_OUT"},
        {"DAI IN MUX", "Right", "DAI_OUT"},
        {"DAI IN MUX", "LeftRight", "DAI_OUT"},
        {"DAI IN MUX", "LeftRightDiv2", "DAI_OUT"},
        {"Rc Filter MUX", "Disable", "DAI IN MUX"},
        {"Rc Filter MUX", "DC Block", "DAI IN MUX"},
        {"Rc Filter MUX", "100Hz", "DAI IN MUX"},
        {"Rc Filter MUX", "200Hz", "DAI IN MUX"},
        {"Rc Filter MUX", "400Hz", "DAI IN MUX"},
        {"Rc Filter MUX", "800Hz", "DAI IN MUX"},
        {"Amp Enable", NULL, "Rc Filter MUX"},
        {"BE_OUT", NULL, "Amp Enable"},
        {"BE_OUT", NULL, "Global Enable"},
};

static bool max98925_volatile_register(struct device *dev, unsigned int reg)
{
        switch (reg) {
        case MAX98925_VBAT_DATA:
        case MAX98925_VBST_DATA:
        case MAX98925_LIVE_STATUS0:
        case MAX98925_LIVE_STATUS1:
        case MAX98925_LIVE_STATUS2:
        case MAX98925_STATE0:
        case MAX98925_STATE1:
        case MAX98925_STATE2:
        case MAX98925_FLAG0:
        case MAX98925_FLAG1:
        case MAX98925_FLAG2:
        case MAX98925_REV_VERSION:
                return true;
        default:
                return false;
        }
}

static bool max98925_readable_register(struct device *dev, unsigned int reg)
{
        switch (reg) {
        case MAX98925_IRQ_CLEAR0:
        case MAX98925_IRQ_CLEAR1:
        case MAX98925_IRQ_CLEAR2:
        case MAX98925_ALC_HOLD_RLS:
                return false;
        default:
                return true;
        }
}

static DECLARE_TLV_DB_SCALE(max98925_spk_tlv, -600, 100, 0);

static const struct snd_kcontrol_new max98925_snd_controls[] = {
        SOC_SINGLE_TLV("Speaker Volume", MAX98925_GAIN,
                M98925_SPK_GAIN_SHIFT, (1<<M98925_SPK_GAIN_WIDTH)-1, 0,
                max98925_spk_tlv),
        SOC_SINGLE("Ramp Switch", MAX98925_GAIN_RAMPING,
                                M98925_SPK_RMP_EN_SHIFT, 1, 0),
        SOC_SINGLE("ZCD Switch", MAX98925_GAIN_RAMPING,
                                M98925_SPK_ZCD_EN_SHIFT, 1, 0),
        SOC_SINGLE("ALC Switch", MAX98925_THRESHOLD,
                                M98925_ALC_EN_SHIFT, 1, 0),
        SOC_SINGLE("ALC Threshold", MAX98925_THRESHOLD, M98925_ALC_TH_SHIFT,
                                (1<<M98925_ALC_TH_WIDTH)-1, 0),
        SOC_ENUM("Boost Output Voltage", max98925_boost_voltage),
};

/* codec sample rate and n/m dividers parameter table */
static const struct {
        int rate;
        int  sr;
        int divisors[3][2];
} rate_table[] = {
        {
                .rate = 8000,
                .sr = 0,
                .divisors = { {1, 375}, {5, 1764}, {1, 384} }
        },
        {
                .rate = 11025,
                .sr = 1,
                .divisors = { {147, 40000}, {1, 256}, {147, 40960} }
        },
        {
                .rate = 12000,
                .sr = 2,
                .divisors = { {1, 250}, {5, 1176}, {1, 256} }
        },
        {
                .rate = 16000,
                .sr = 3,
                .divisors = { {2, 375}, {5, 882}, {1, 192} }
        },
        {
                .rate = 22050,
                .sr = 4,
                .divisors = { {147, 20000}, {1, 128}, {147, 20480} }
        },
        {
                .rate = 24000,
                .sr = 5,
                .divisors = { {1, 125}, {5, 588}, {1, 128} }
        },
        {
                .rate = 32000,
                .sr = 6,
                .divisors = { {4, 375}, {5, 441}, {1, 96} }
        },
        {
                .rate = 44100,
                .sr = 7,
                .divisors = { {147, 10000}, {1, 64}, {147, 10240} }
        },
        {
                .rate = 48000,
                .sr = 8,
                .divisors = { {2, 125}, {5, 294}, {1, 64} }
        },
};

static inline int max98925_rate_value(struct snd_soc_component *component,
                int rate, int clock, int *value, int *n, int *m)
{
        int ret = -EINVAL;
        int i;

        for (i = 0; i < ARRAY_SIZE(rate_table); i++) {
                if (rate_table[i].rate >= rate) {
                        *value = rate_table[i].sr;
                        *n = rate_table[i].divisors[clock][0];
                        *m = rate_table[i].divisors[clock][1];
                        ret = 0;
                        break;
                }
        }
        return ret;
}

static void max98925_set_sense_data(struct max98925_priv *max98925)
{
        /* set VMON slots */
        regmap_update_bits(max98925->regmap,
                MAX98925_DOUT_CFG_VMON,
                M98925_DAI_VMON_EN_MASK, M98925_DAI_VMON_EN_MASK);
        regmap_update_bits(max98925->regmap,
                MAX98925_DOUT_CFG_VMON,
                M98925_DAI_VMON_SLOT_MASK,
                max98925->v_slot << M98925_DAI_VMON_SLOT_SHIFT);
        /* set IMON slots */
        regmap_update_bits(max98925->regmap,
                MAX98925_DOUT_CFG_IMON,
                M98925_DAI_IMON_EN_MASK, M98925_DAI_IMON_EN_MASK);
        regmap_update_bits(max98925->regmap,
                MAX98925_DOUT_CFG_IMON,
                M98925_DAI_IMON_SLOT_MASK,
                max98925->i_slot << M98925_DAI_IMON_SLOT_SHIFT);
}

static int max98925_dai_set_fmt(struct snd_soc_dai *codec_dai,
                                 unsigned int fmt)
{
        struct snd_soc_component *component = codec_dai->component;
        struct max98925_priv *max98925 = snd_soc_component_get_drvdata(component);
        unsigned int invert = 0;

        dev_dbg(component->dev, "%s: fmt 0x%08X\n", __func__, fmt);
        switch (fmt & SND_SOC_DAIFMT_CLOCK_PROVIDER_MASK) {
        case SND_SOC_DAIFMT_CBC_CFC:
                regmap_update_bits(max98925->regmap,
                        MAX98925_DAI_CLK_MODE2,
                        M98925_DAI_MAS_MASK, 0);
                max98925_set_sense_data(max98925);
                break;
        case SND_SOC_DAIFMT_CBP_CFP:
                /*
                 * set left channel DAI to provider mode,
                 * right channel always consumer
                 */
                regmap_update_bits(max98925->regmap,
                        MAX98925_DAI_CLK_MODE2,
                        M98925_DAI_MAS_MASK, M98925_DAI_MAS_MASK);
                break;
        default:
                dev_err(component->dev, "DAI clock mode unsupported");
                return -EINVAL;
        }

        switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
        case SND_SOC_DAIFMT_NB_NF:
                break;
        case SND_SOC_DAIFMT_NB_IF:
                invert = M98925_DAI_WCI_MASK;
                break;
        case SND_SOC_DAIFMT_IB_NF:
                invert = M98925_DAI_BCI_MASK;
                break;
        case SND_SOC_DAIFMT_IB_IF:
                invert = M98925_DAI_BCI_MASK | M98925_DAI_WCI_MASK;
                break;
        default:
                dev_err(component->dev, "DAI invert mode unsupported");
                return -EINVAL;
        }

        regmap_update_bits(max98925->regmap, MAX98925_FORMAT,
                        M98925_DAI_BCI_MASK | M98925_DAI_WCI_MASK, invert);
        return 0;
}

static int max98925_set_clock(struct max98925_priv *max98925,
                struct snd_pcm_hw_params *params)
{
        unsigned int dai_sr = 0, clock, mdll, n, m;
        struct snd_soc_component *component = max98925->component;
        int rate = params_rate(params);
        /* BCLK/LRCLK ratio calculation */
        int blr_clk_ratio = params_channels(params) * max98925->ch_size;

        switch (blr_clk_ratio) {
        case 32:
                regmap_update_bits(max98925->regmap,
                        MAX98925_DAI_CLK_MODE2,
                        M98925_DAI_BSEL_MASK, M98925_DAI_BSEL_32);
                break;
        case 48:
                regmap_update_bits(max98925->regmap,
                        MAX98925_DAI_CLK_MODE2,
                        M98925_DAI_BSEL_MASK, M98925_DAI_BSEL_48);
                break;
        case 64:
                regmap_update_bits(max98925->regmap,
                        MAX98925_DAI_CLK_MODE2,
                        M98925_DAI_BSEL_MASK, M98925_DAI_BSEL_64);
                break;
        default:
                return -EINVAL;
        }

        switch (max98925->sysclk) {
        case 6000000:
                clock = 0;
                mdll  = M98925_MDLL_MULT_MCLKx16;
                break;
        case 11289600:
                clock = 1;
                mdll  = M98925_MDLL_MULT_MCLKx8;
                break;
        case 12000000:
                clock = 0;
                mdll  = M98925_MDLL_MULT_MCLKx8;
                break;
        case 12288000:
                clock = 2;
                mdll  = M98925_MDLL_MULT_MCLKx8;
                break;
        default:
                dev_info(max98925->component->dev, "unsupported sysclk %d\n",
                                        max98925->sysclk);
                return -EINVAL;
        }

        if (max98925_rate_value(component, rate, clock, &dai_sr, &n, &m))
                return -EINVAL;

        /* set DAI_SR to correct LRCLK frequency */
        regmap_update_bits(max98925->regmap,
                        MAX98925_DAI_CLK_MODE2,
                        M98925_DAI_SR_MASK, dai_sr << M98925_DAI_SR_SHIFT);
        /* set DAI m divider */
        regmap_write(max98925->regmap,
                MAX98925_DAI_CLK_DIV_M_MSBS, m >> 8);
        regmap_write(max98925->regmap,
                MAX98925_DAI_CLK_DIV_M_LSBS, m & 0xFF);
        /* set DAI n divider */
        regmap_write(max98925->regmap,
                MAX98925_DAI_CLK_DIV_N_MSBS, n >> 8);
        regmap_write(max98925->regmap,
                MAX98925_DAI_CLK_DIV_N_LSBS, n & 0xFF);
        /* set MDLL */
        regmap_update_bits(max98925->regmap, MAX98925_DAI_CLK_MODE1,
                        M98925_MDLL_MULT_MASK, mdll << M98925_MDLL_MULT_SHIFT);
        return 0;
}

static int max98925_dai_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 max98925_priv *max98925 = snd_soc_component_get_drvdata(component);

        switch (params_width(params)) {
        case 16:
                regmap_update_bits(max98925->regmap,
                                MAX98925_FORMAT,
                                M98925_DAI_CHANSZ_MASK, M98925_DAI_CHANSZ_16);
                max98925->ch_size = 16;
                break;
        case 24:
                regmap_update_bits(max98925->regmap,
                                MAX98925_FORMAT,
                                M98925_DAI_CHANSZ_MASK, M98925_DAI_CHANSZ_24);
                max98925->ch_size = 24;
                break;
        case 32:
                regmap_update_bits(max98925->regmap,
                                MAX98925_FORMAT,
                                M98925_DAI_CHANSZ_MASK, M98925_DAI_CHANSZ_32);
                max98925->ch_size = 32;
                break;
        default:
                pr_err("%s: format unsupported %d",
                                __func__, params_format(params));
                return -EINVAL;
        }
        dev_dbg(component->dev, "%s: format supported %d",
                                __func__, params_format(params));
        return max98925_set_clock(max98925, params);
}

static int max98925_dai_set_sysclk(struct snd_soc_dai *dai,
                                   int clk_id, unsigned int freq, int dir)
{
        struct snd_soc_component *component = dai->component;
        struct max98925_priv *max98925 = snd_soc_component_get_drvdata(component);

        switch (clk_id) {
        case 0:
                /* use MCLK for Left channel, right channel always BCLK */
                regmap_update_bits(max98925->regmap,
                                MAX98925_DAI_CLK_MODE1,
                                M98925_DAI_CLK_SOURCE_MASK, 0);
                break;
        case 1:
                /* configure dai clock source to BCLK instead of MCLK */
                regmap_update_bits(max98925->regmap,
                                MAX98925_DAI_CLK_MODE1,
                                M98925_DAI_CLK_SOURCE_MASK,
                                M98925_DAI_CLK_SOURCE_MASK);
                break;
        default:
                return -EINVAL;
        }
        max98925->sysclk = freq;
        return 0;
}

#define MAX98925_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | \
                        SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S32_LE)

static const struct snd_soc_dai_ops max98925_dai_ops = {
        .set_sysclk = max98925_dai_set_sysclk,
        .set_fmt = max98925_dai_set_fmt,
        .hw_params = max98925_dai_hw_params,
};

static struct snd_soc_dai_driver max98925_dai[] = {
        {
                .name = "max98925-aif1",
                .playback = {
                        .stream_name = "HiFi Playback",
                        .channels_min = 1,
                        .channels_max = 2,
                        .rates = SNDRV_PCM_RATE_8000_48000,
                        .formats = MAX98925_FORMATS,
                },
                .capture = {
                        .stream_name = "HiFi Capture",
                        .channels_min = 1,
                        .channels_max = 2,
                        .rates = SNDRV_PCM_RATE_8000_48000,
                        .formats = MAX98925_FORMATS,
                },
                .ops = &max98925_dai_ops,
        }
};

static int max98925_probe(struct snd_soc_component *component)
{
        struct max98925_priv *max98925 = snd_soc_component_get_drvdata(component);

        max98925->component = component;
        regmap_write(max98925->regmap, MAX98925_GLOBAL_ENABLE, 0x00);
        /* It's not the default but we need to set DAI_DLY */
        regmap_write(max98925->regmap,
                        MAX98925_FORMAT, M98925_DAI_DLY_MASK);
        regmap_write(max98925->regmap, MAX98925_TDM_SLOT_SELECT, 0xC8);
        regmap_write(max98925->regmap, MAX98925_DOUT_HIZ_CFG1, 0xFF);
        regmap_write(max98925->regmap, MAX98925_DOUT_HIZ_CFG2, 0xFF);
        regmap_write(max98925->regmap, MAX98925_DOUT_HIZ_CFG3, 0xFF);
        regmap_write(max98925->regmap, MAX98925_DOUT_HIZ_CFG4, 0xF0);
        regmap_write(max98925->regmap, MAX98925_FILTERS, 0xD8);
        regmap_write(max98925->regmap, MAX98925_ALC_CONFIGURATION, 0xF8);
        regmap_write(max98925->regmap, MAX98925_CONFIGURATION, 0xF0);
        /* Disable ALC muting */
        regmap_write(max98925->regmap, MAX98925_BOOST_LIMITER, 0xF8);
        return 0;
}

static const struct snd_soc_component_driver soc_component_dev_max98925 = {
        .probe                  = max98925_probe,
        .controls               = max98925_snd_controls,
        .num_controls           = ARRAY_SIZE(max98925_snd_controls),
        .dapm_routes            = max98925_audio_map,
        .num_dapm_routes        = ARRAY_SIZE(max98925_audio_map),
        .dapm_widgets           = max98925_dapm_widgets,
        .num_dapm_widgets       = ARRAY_SIZE(max98925_dapm_widgets),
        .idle_bias_on           = 1,
        .use_pmdown_time        = 1,
        .endianness             = 1,
};

static const struct regmap_config max98925_regmap = {
        .reg_bits         = 8,
        .val_bits         = 8,
        .max_register     = MAX98925_REV_VERSION,
        .reg_defaults     = max98925_reg,
        .num_reg_defaults = ARRAY_SIZE(max98925_reg),
        .volatile_reg     = max98925_volatile_register,
        .readable_reg     = max98925_readable_register,
        .cache_type       = REGCACHE_RBTREE,
};

static int max98925_i2c_probe(struct i2c_client *i2c)
{
        int ret, reg;
        u32 value;
        struct max98925_priv *max98925;

        max98925 = devm_kzalloc(&i2c->dev,
                        sizeof(*max98925), GFP_KERNEL);
        if (!max98925)
                return -ENOMEM;

        i2c_set_clientdata(i2c, max98925);
        max98925->regmap = devm_regmap_init_i2c(i2c, &max98925_regmap);
        if (IS_ERR(max98925->regmap)) {
                ret = PTR_ERR(max98925->regmap);
                dev_err(&i2c->dev,
                                "Failed to allocate regmap: %d\n", ret);
                return ret;
        }

        if (!of_property_read_u32(i2c->dev.of_node, "vmon-slot-no", &value)) {
                if (value > M98925_DAI_VMON_SLOT_1E_1F) {
                        dev_err(&i2c->dev, "vmon slot number is wrong:\n");
                        return -EINVAL;
                }
                max98925->v_slot = value;
        }
        if (!of_property_read_u32(i2c->dev.of_node, "imon-slot-no", &value)) {
                if (value > M98925_DAI_IMON_SLOT_1E_1F) {
                        dev_err(&i2c->dev, "imon slot number is wrong:\n");
                        return -EINVAL;
                }
                max98925->i_slot = value;
        }

        ret = regmap_read(max98925->regmap, MAX98925_REV_VERSION, &reg);
        if (ret < 0) {
                dev_err(&i2c->dev, "Read revision failed\n");
                return ret;
        }

        if ((reg != MAX98925_VERSION) && (reg != MAX98925_VERSION1)) {
                ret = -ENODEV;
                dev_err(&i2c->dev, "Invalid revision (%d 0x%02X)\n",
                        ret, reg);
                return ret;
        }

        dev_info(&i2c->dev, "device version 0x%02X\n", reg);

        ret = devm_snd_soc_register_component(&i2c->dev,
                        &soc_component_dev_max98925,
                        max98925_dai, ARRAY_SIZE(max98925_dai));
        if (ret < 0)
                dev_err(&i2c->dev,
                                "Failed to register component: %d\n", ret);
        return ret;
}

static const struct i2c_device_id max98925_i2c_id[] = {
        { "max98925" },
        { }
};
MODULE_DEVICE_TABLE(i2c, max98925_i2c_id);

#ifdef CONFIG_OF
static const struct of_device_id max98925_of_match[] = {
        { .compatible = "maxim,max98925", },
        { }
};
MODULE_DEVICE_TABLE(of, max98925_of_match);
#endif

static struct i2c_driver max98925_i2c_driver = {
        .driver = {
                .name = "max98925",
                .of_match_table = of_match_ptr(max98925_of_match),
        },
        .probe = max98925_i2c_probe,
        .id_table = max98925_i2c_id,
};

module_i2c_driver(max98925_i2c_driver)

MODULE_DESCRIPTION("ALSA SoC MAX98925 driver");
MODULE_AUTHOR("Ralph Birt <rdbirt@gmail.com>, Anish kumar <anish.kumar@maximintegrated.com>");
MODULE_LICENSE("GPL");