// SPDX-License-Identifier: GPL-2.0
//
// Driver for the MAX9860 Mono Audio Voice Codec
//
// https://datasheets.maximintegrated.com/en/ds/MAX9860.pdf
//
// The driver does not support sidetone since the DVST register field is
// backwards with the mute near the maximum level instead of the minimum.
//
// Author: Peter Rosin <peda@axentia.s>
//         Copyright 2016 Axentia Technologies

#include <linux/init.h>
#include <linux/module.h>
#include <linux/clk.h>
#include <linux/kernel.h>
#include <linux/pm_runtime.h>
#include <linux/regmap.h>
#include <linux/i2c.h>
#include <linux/regulator/consumer.h>
#include <sound/soc.h>
#include <sound/soc-dapm.h>
#include <sound/pcm_params.h>
#include <sound/tlv.h>

#include "max9860.h"

struct max9860_priv {
        struct regmap *regmap;
        struct regulator *dvddio;
        struct notifier_block dvddio_nb;
        u8 psclk;
        unsigned long pclk_rate;
        int fmt;
};

static int max9860_dvddio_event(struct notifier_block *nb,
                                unsigned long event, void *data)
{
        struct max9860_priv *max9860 = container_of(nb, struct max9860_priv,
                                                    dvddio_nb);
        if (event & REGULATOR_EVENT_DISABLE) {
                regcache_mark_dirty(max9860->regmap);
                regcache_cache_only(max9860->regmap, true);
        }

        return 0;
}

static const struct reg_default max9860_reg_defaults[] = {
        { MAX9860_PWRMAN,       0x00 },
        { MAX9860_INTEN,        0x00 },
        { MAX9860_SYSCLK,       0x00 },
        { MAX9860_AUDIOCLKHIGH, 0x00 },
        { MAX9860_AUDIOCLKLOW,  0x00 },
        { MAX9860_IFC1A,        0x00 },
        { MAX9860_IFC1B,        0x00 },
        { MAX9860_VOICEFLTR,    0x00 },
        { MAX9860_DACATTN,      0x00 },
        { MAX9860_ADCLEVEL,     0x00 },
        { MAX9860_DACGAIN,      0x00 },
        { MAX9860_MICGAIN,      0x00 },
        { MAX9860_MICADC,       0x00 },
        { MAX9860_NOISEGATE,    0x00 },
};

static bool max9860_readable(struct device *dev, unsigned int reg)
{
        switch (reg) {
        case MAX9860_INTRSTATUS ... MAX9860_MICGAIN:
        case MAX9860_MICADC ... MAX9860_PWRMAN:
        case MAX9860_REVISION:
                return true;
        }

        return false;
}

static bool max9860_writeable(struct device *dev, unsigned int reg)
{
        switch (reg) {
        case MAX9860_INTEN ... MAX9860_MICGAIN:
        case MAX9860_MICADC ... MAX9860_PWRMAN:
                return true;
        }

        return false;
}

static bool max9860_volatile(struct device *dev, unsigned int reg)
{
        switch (reg) {
        case MAX9860_INTRSTATUS:
        case MAX9860_MICREADBACK:
                return true;
        }

        return false;
}

static bool max9860_precious(struct device *dev, unsigned int reg)
{
        switch (reg) {
        case MAX9860_INTRSTATUS:
                return true;
        }

        return false;
}

static const struct regmap_config max9860_regmap = {
        .reg_bits = 8,
        .val_bits = 8,

        .readable_reg = max9860_readable,
        .writeable_reg = max9860_writeable,
        .volatile_reg = max9860_volatile,
        .precious_reg = max9860_precious,

        .max_register = MAX9860_MAX_REGISTER,
        .reg_defaults = max9860_reg_defaults,
        .num_reg_defaults = ARRAY_SIZE(max9860_reg_defaults),
        .cache_type = REGCACHE_RBTREE,
};

static const DECLARE_TLV_DB_SCALE(dva_tlv, -9100, 100, 1);
static const DECLARE_TLV_DB_SCALE(dvg_tlv, 0, 600, 0);
static const DECLARE_TLV_DB_SCALE(adc_tlv, -1200, 100, 0);
static const DECLARE_TLV_DB_RANGE(pam_tlv,
        0, MAX9860_PAM_MAX - 1,             TLV_DB_SCALE_ITEM(-2000, 2000, 1),
        MAX9860_PAM_MAX, MAX9860_PAM_MAX,   TLV_DB_SCALE_ITEM(3000, 0, 0));
static const DECLARE_TLV_DB_SCALE(pgam_tlv, 0, 100, 0);
static const DECLARE_TLV_DB_SCALE(anth_tlv, -7600, 400, 1);
static const DECLARE_TLV_DB_SCALE(agcth_tlv, -1800, 100, 0);

static const char * const agchld_text[] = {
        "AGC Disabled", "50ms", "100ms", "400ms"
};

static SOC_ENUM_SINGLE_DECL(agchld_enum, MAX9860_MICADC,
                            MAX9860_AGCHLD_SHIFT, agchld_text);

static const char * const agcsrc_text[] = {
        "Left ADC", "Left/Right ADC"
};

static SOC_ENUM_SINGLE_DECL(agcsrc_enum, MAX9860_MICADC,
                            MAX9860_AGCSRC_SHIFT, agcsrc_text);

static const char * const agcatk_text[] = {
        "3ms", "12ms", "50ms", "200ms"
};

static SOC_ENUM_SINGLE_DECL(agcatk_enum, MAX9860_MICADC,
                            MAX9860_AGCATK_SHIFT, agcatk_text);

static const char * const agcrls_text[] = {
        "78ms", "156ms", "312ms", "625ms",
        "1.25s", "2.5s", "5s", "10s"
};

static SOC_ENUM_SINGLE_DECL(agcrls_enum, MAX9860_MICADC,
                            MAX9860_AGCRLS_SHIFT, agcrls_text);

static const char * const filter_text[] = {
        "Disabled",
        "Elliptical HP 217Hz notch (16kHz)",
        "Butterworth HP 500Hz (16kHz)",
        "Elliptical HP 217Hz notch (8kHz)",
        "Butterworth HP 500Hz (8kHz)",
        "Butterworth HP 200Hz (48kHz)"
};

static SOC_ENUM_SINGLE_DECL(avflt_enum, MAX9860_VOICEFLTR,
                            MAX9860_AVFLT_SHIFT, filter_text);

static SOC_ENUM_SINGLE_DECL(dvflt_enum, MAX9860_VOICEFLTR,
                            MAX9860_DVFLT_SHIFT, filter_text);

static const struct snd_kcontrol_new max9860_controls[] = {
SOC_SINGLE_TLV("Master Playback Volume", MAX9860_DACATTN,
               MAX9860_DVA_SHIFT, MAX9860_DVA_MUTE, 1, dva_tlv),
SOC_SINGLE_TLV("DAC Gain Volume", MAX9860_DACGAIN,
               MAX9860_DVG_SHIFT, MAX9860_DVG_MAX, 0, dvg_tlv),
SOC_DOUBLE_TLV("Line Capture Volume", MAX9860_ADCLEVEL,
               MAX9860_ADCLL_SHIFT, MAX9860_ADCRL_SHIFT, MAX9860_ADCxL_MIN, 1,
               adc_tlv),

SOC_ENUM("AGC Hold Time", agchld_enum),
SOC_ENUM("AGC/Noise Gate Source", agcsrc_enum),
SOC_ENUM("AGC Attack Time", agcatk_enum),
SOC_ENUM("AGC Release Time", agcrls_enum),

SOC_SINGLE_TLV("Noise Gate Threshold Volume", MAX9860_NOISEGATE,
               MAX9860_ANTH_SHIFT, MAX9860_ANTH_MAX, 0, anth_tlv),
SOC_SINGLE_TLV("AGC Signal Threshold Volume", MAX9860_NOISEGATE,
               MAX9860_AGCTH_SHIFT, MAX9860_AGCTH_MIN, 1, agcth_tlv),

SOC_SINGLE_TLV("Mic PGA Volume", MAX9860_MICGAIN,
               MAX9860_PGAM_SHIFT, MAX9860_PGAM_MIN, 1, pgam_tlv),
SOC_SINGLE_TLV("Mic Preamp Volume", MAX9860_MICGAIN,
               MAX9860_PAM_SHIFT, MAX9860_PAM_MAX, 0, pam_tlv),

SOC_ENUM("ADC Filter", avflt_enum),
SOC_ENUM("DAC Filter", dvflt_enum),
};

static const struct snd_soc_dapm_widget max9860_dapm_widgets[] = {
SND_SOC_DAPM_INPUT("MICL"),
SND_SOC_DAPM_INPUT("MICR"),

SND_SOC_DAPM_ADC("ADCL", NULL, MAX9860_PWRMAN, MAX9860_ADCLEN_SHIFT, 0),
SND_SOC_DAPM_ADC("ADCR", NULL, MAX9860_PWRMAN, MAX9860_ADCREN_SHIFT, 0),

SND_SOC_DAPM_AIF_OUT("AIFOUTL", "Capture", 0, SND_SOC_NOPM, 0, 0),
SND_SOC_DAPM_AIF_OUT("AIFOUTR", "Capture", 1, SND_SOC_NOPM, 0, 0),

SND_SOC_DAPM_AIF_IN("AIFINL", "Playback", 0, SND_SOC_NOPM, 0, 0),
SND_SOC_DAPM_AIF_IN("AIFINR", "Playback", 1, SND_SOC_NOPM, 0, 0),

SND_SOC_DAPM_DAC("DAC", NULL, MAX9860_PWRMAN, MAX9860_DACEN_SHIFT, 0),

SND_SOC_DAPM_OUTPUT("OUT"),

SND_SOC_DAPM_SUPPLY("Supply", SND_SOC_NOPM, 0, 0,
                    NULL, SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD),
SND_SOC_DAPM_REGULATOR_SUPPLY("AVDD", 0, 0),
SND_SOC_DAPM_REGULATOR_SUPPLY("DVDD", 0, 0),
SND_SOC_DAPM_CLOCK_SUPPLY("mclk"),
};

static const struct snd_soc_dapm_route max9860_dapm_routes[] = {
        { "ADCL", NULL, "MICL" },
        { "ADCR", NULL, "MICR" },
        { "AIFOUTL", NULL, "ADCL" },
        { "AIFOUTR", NULL, "ADCR" },

        { "DAC", NULL, "AIFINL" },
        { "DAC", NULL, "AIFINR" },
        { "OUT", NULL, "DAC" },

        { "Supply", NULL, "AVDD" },
        { "Supply", NULL, "DVDD" },
        { "Supply", NULL, "mclk" },

        { "DAC", NULL, "Supply" },
        { "ADCL", NULL, "Supply" },
        { "ADCR", NULL, "Supply" },
};

static int max9860_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 max9860_priv *max9860 = snd_soc_component_get_drvdata(component);
        u8 master;
        u8 ifc1a = 0;
        u8 ifc1b = 0;
        u8 sysclk = 0;
        unsigned long n;
        int ret;

        dev_dbg(component->dev, "hw_params %u Hz, %u channels\n",
                params_rate(params),
                params_channels(params));

        if (params_channels(params) == 2)
                ifc1b |= MAX9860_ST;

        switch (max9860->fmt & SND_SOC_DAIFMT_CLOCK_PROVIDER_MASK) {
        case SND_SOC_DAIFMT_CBC_CFC:
                master = 0;
                break;
        case SND_SOC_DAIFMT_CBP_CFP:
                master = MAX9860_MASTER;
                break;
        default:
                return -EINVAL;
        }
        ifc1a |= master;

        if (master) {
                if (params_width(params) * params_channels(params) > 48)
                        ifc1b |= MAX9860_BSEL_64X;
                else
                        ifc1b |= MAX9860_BSEL_48X;
        }

        switch (max9860->fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
        case SND_SOC_DAIFMT_I2S:
                ifc1a |= MAX9860_DDLY;
                ifc1b |= MAX9860_ADLY;
                break;
        case SND_SOC_DAIFMT_LEFT_J:
                ifc1a |= MAX9860_WCI;
                break;
        case SND_SOC_DAIFMT_DSP_A:
                if (params_width(params) != 16) {
                        dev_err(component->dev,
                                "DSP_A works for 16 bits per sample only.\n");
                        return -EINVAL;
                }
                ifc1a |= MAX9860_DDLY | MAX9860_WCI | MAX9860_HIZ | MAX9860_TDM;
                ifc1b |= MAX9860_ADLY;
                break;
        case SND_SOC_DAIFMT_DSP_B:
                if (params_width(params) != 16) {
                        dev_err(component->dev,
                                "DSP_B works for 16 bits per sample only.\n");
                        return -EINVAL;
                }
                ifc1a |= MAX9860_WCI | MAX9860_HIZ | MAX9860_TDM;
                break;
        default:
                return -EINVAL;
        }

        switch (max9860->fmt & SND_SOC_DAIFMT_INV_MASK) {
        case SND_SOC_DAIFMT_NB_NF:
                break;
        case SND_SOC_DAIFMT_NB_IF:
                switch (max9860->fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
                case SND_SOC_DAIFMT_DSP_A:
                case SND_SOC_DAIFMT_DSP_B:
                        return -EINVAL;
                }
                ifc1a ^= MAX9860_WCI;
                break;
        case SND_SOC_DAIFMT_IB_IF:
                switch (max9860->fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
                case SND_SOC_DAIFMT_DSP_A:
                case SND_SOC_DAIFMT_DSP_B:
                        return -EINVAL;
                }
                ifc1a ^= MAX9860_WCI;
                fallthrough;
        case SND_SOC_DAIFMT_IB_NF:
                ifc1a ^= MAX9860_DBCI;
                ifc1b ^= MAX9860_ABCI;
                break;
        default:
                return -EINVAL;
        }

        dev_dbg(component->dev, "IFC1A  %02x\n", ifc1a);
        ret = regmap_write(max9860->regmap, MAX9860_IFC1A, ifc1a);
        if (ret) {
                dev_err(component->dev, "Failed to set IFC1A: %d\n", ret);
                return ret;
        }
        dev_dbg(component->dev, "IFC1B  %02x\n", ifc1b);
        ret = regmap_write(max9860->regmap, MAX9860_IFC1B, ifc1b);
        if (ret) {
                dev_err(component->dev, "Failed to set IFC1B: %d\n", ret);
                return ret;
        }

        /*
         * Check if Integer Clock Mode is possible, but avoid it in slave mode
         * since we then do not know if lrclk is derived from pclk and the
         * datasheet mentions that the frequencies have to match exactly in
         * order for this to work.
         */
        if (params_rate(params) == 8000 || params_rate(params) == 16000) {
                if (master) {
                        switch (max9860->pclk_rate) {
                        case 12000000:
                                sysclk = MAX9860_FREQ_12MHZ;
                                break;
                        case 13000000:
                                sysclk = MAX9860_FREQ_13MHZ;
                                break;
                        case 19200000:
                                sysclk = MAX9860_FREQ_19_2MHZ;
                                break;
                        default:
                                /*
                                 * Integer Clock Mode not possible. Leave
                                 * sysclk at zero and fall through to the
                                 * code below for PLL mode.
                                 */
                                break;
                        }

                        if (sysclk && params_rate(params) == 16000)
                                sysclk |= MAX9860_16KHZ;
                }
        }

        /*
         * Largest possible n:
         *    65536 * 96 * 48kHz / 10MHz -> 30199
         * Smallest possible n:
         *    65536 * 96 *  8kHz / 20MHz -> 2517
         * Both fit nicely in the available 15 bits, no need to apply any mask.
         */
        n = DIV_ROUND_CLOSEST_ULL(65536ULL * 96 * params_rate(params),
                                  max9860->pclk_rate);

        if (!sysclk) {
                /* PLL mode */
                if (params_rate(params) > 24000)
                        sysclk |= MAX9860_16KHZ;

                if (!master)
                        n |= 1; /* trigger rapid pll lock mode */
        }

        sysclk |= max9860->psclk;
        dev_dbg(component->dev, "SYSCLK %02x\n", sysclk);
        ret = regmap_write(max9860->regmap,
                           MAX9860_SYSCLK, sysclk);
        if (ret) {
                dev_err(component->dev, "Failed to set SYSCLK: %d\n", ret);
                return ret;
        }
        dev_dbg(component->dev, "N %lu\n", n);
        ret = regmap_write(max9860->regmap,
                           MAX9860_AUDIOCLKHIGH, n >> 8);
        if (ret) {
                dev_err(component->dev, "Failed to set NHI: %d\n", ret);
                return ret;
        }
        ret = regmap_write(max9860->regmap,
                           MAX9860_AUDIOCLKLOW, n & 0xff);
        if (ret) {
                dev_err(component->dev, "Failed to set NLO: %d\n", ret);
                return ret;
        }

        if (!master) {
                dev_dbg(component->dev, "Enable PLL\n");
                ret = regmap_update_bits(max9860->regmap, MAX9860_AUDIOCLKHIGH,
                                         MAX9860_PLL, MAX9860_PLL);
                if (ret) {
                        dev_err(component->dev, "Failed to enable PLL: %d\n",
                                ret);
                        return ret;
                }
        }

        return 0;
}

static int max9860_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
{
        struct snd_soc_component *component = dai->component;
        struct max9860_priv *max9860 = snd_soc_component_get_drvdata(component);

        switch (fmt & SND_SOC_DAIFMT_CLOCK_PROVIDER_MASK) {
        case SND_SOC_DAIFMT_CBP_CFP:
        case SND_SOC_DAIFMT_CBC_CFC:
                max9860->fmt = fmt;
                return 0;

        default:
                return -EINVAL;
        }
}

static const struct snd_soc_dai_ops max9860_dai_ops = {
        .hw_params = max9860_hw_params,
        .set_fmt = max9860_set_fmt,
};

static struct snd_soc_dai_driver max9860_dai = {
        .name = "max9860-hifi",
        .playback = {
                .stream_name = "Playback",
                .channels_min = 1,
                .channels_max = 2,
                .rates = SNDRV_PCM_RATE_CONTINUOUS,
                .rate_min = 8000,
                .rate_max = 48000,
                .formats = SNDRV_PCM_FMTBIT_S16_LE |
                           SNDRV_PCM_FMTBIT_S24_LE |
                           SNDRV_PCM_FMTBIT_S32_LE,
        },
        .capture = {
                .stream_name = "Capture",
                .channels_min = 1,
                .channels_max = 2,
                .rates = SNDRV_PCM_RATE_CONTINUOUS,
                .rate_min = 8000,
                .rate_max = 48000,
                .formats = SNDRV_PCM_FMTBIT_S16_LE |
                           SNDRV_PCM_FMTBIT_S24_LE |
                           SNDRV_PCM_FMTBIT_S32_LE,
        },
        .ops = &max9860_dai_ops,
        .symmetric_rate = 1,
};

static int max9860_set_bias_level(struct snd_soc_component *component,
                                  enum snd_soc_bias_level level)
{
        struct max9860_priv *max9860 = dev_get_drvdata(component->dev);
        int ret;

        switch (level) {
        case SND_SOC_BIAS_ON:
        case SND_SOC_BIAS_PREPARE:
                break;

        case SND_SOC_BIAS_STANDBY:
                ret = regmap_update_bits(max9860->regmap, MAX9860_PWRMAN,
                                         MAX9860_SHDN, MAX9860_SHDN);
                if (ret) {
                        dev_err(component->dev, "Failed to remove SHDN: %d\n",
                                ret);
                        return ret;
                }
                break;

        case SND_SOC_BIAS_OFF:
                ret = regmap_update_bits(max9860->regmap, MAX9860_PWRMAN,
                                         MAX9860_SHDN, 0);
                if (ret) {
                        dev_err(component->dev, "Failed to request SHDN: %d\n",
                                ret);
                        return ret;
                }
                break;
        }

        return 0;
}

static const struct snd_soc_component_driver max9860_component_driver = {
        .set_bias_level         = max9860_set_bias_level,
        .controls               = max9860_controls,
        .num_controls           = ARRAY_SIZE(max9860_controls),
        .dapm_widgets           = max9860_dapm_widgets,
        .num_dapm_widgets       = ARRAY_SIZE(max9860_dapm_widgets),
        .dapm_routes            = max9860_dapm_routes,
        .num_dapm_routes        = ARRAY_SIZE(max9860_dapm_routes),
        .use_pmdown_time        = 1,
        .endianness             = 1,
};

static int max9860_suspend(struct device *dev)
{
        struct max9860_priv *max9860 = dev_get_drvdata(dev);
        int ret;

        ret = regmap_update_bits(max9860->regmap, MAX9860_SYSCLK,
                                 MAX9860_PSCLK, MAX9860_PSCLK_OFF);
        if (ret) {
                dev_err(dev, "Failed to disable clock: %d\n", ret);
                return ret;
        }

        regulator_disable(max9860->dvddio);

        return 0;
}

static int max9860_resume(struct device *dev)
{
        struct max9860_priv *max9860 = dev_get_drvdata(dev);
        int ret;

        ret = regulator_enable(max9860->dvddio);
        if (ret) {
                dev_err(dev, "Failed to enable DVDDIO: %d\n", ret);
                return ret;
        }

        regcache_cache_only(max9860->regmap, false);
        ret = regcache_sync(max9860->regmap);
        if (ret) {
                dev_err(dev, "Failed to sync cache: %d\n", ret);
                return ret;
        }

        ret = regmap_update_bits(max9860->regmap, MAX9860_SYSCLK,
                                 MAX9860_PSCLK, max9860->psclk);
        if (ret) {
                dev_err(dev, "Failed to enable clock: %d\n", ret);
                return ret;
        }

        return 0;
}

static const struct dev_pm_ops max9860_pm_ops = {
        RUNTIME_PM_OPS(max9860_suspend, max9860_resume, NULL)
};

static int max9860_probe(struct i2c_client *i2c)
{
        struct device *dev = &i2c->dev;
        struct max9860_priv *max9860;
        int ret;
        struct clk *mclk;
        unsigned long mclk_rate;
        int i;
        int intr;

        max9860 = devm_kzalloc(dev, sizeof(struct max9860_priv), GFP_KERNEL);
        if (!max9860)
                return -ENOMEM;

        max9860->dvddio = devm_regulator_get(dev, "DVDDIO");
        if (IS_ERR(max9860->dvddio))
                return dev_err_probe(dev, PTR_ERR(max9860->dvddio),
                                     "Failed to get DVDDIO supply\n");

        max9860->dvddio_nb.notifier_call = max9860_dvddio_event;

        ret = devm_regulator_register_notifier(max9860->dvddio,
                                               &max9860->dvddio_nb);
        if (ret)
                dev_err(dev, "Failed to register DVDDIO notifier: %d\n", ret);

        ret = regulator_enable(max9860->dvddio);
        if (ret != 0) {
                dev_err(dev, "Failed to enable DVDDIO: %d\n", ret);
                return ret;
        }

        max9860->regmap = devm_regmap_init_i2c(i2c, &max9860_regmap);
        if (IS_ERR(max9860->regmap)) {
                ret = PTR_ERR(max9860->regmap);
                goto err_regulator;
        }

        dev_set_drvdata(dev, max9860);

        /*
         * mclk has to be in the 10MHz to 60MHz range.
         * psclk is used to scale mclk into pclk so that
         * pclk is in the 10MHz to 20MHz range.
         */
        mclk = clk_get(dev, "mclk");

        if (IS_ERR(mclk)) {
                ret = PTR_ERR(mclk);
                dev_err_probe(dev, ret, "Failed to get MCLK\n");
                goto err_regulator;
        }

        mclk_rate = clk_get_rate(mclk);
        clk_put(mclk);

        if (mclk_rate > 60000000 || mclk_rate < 10000000) {
                dev_err(dev, "Bad mclk %luHz (needs 10MHz - 60MHz)\n",
                        mclk_rate);
                ret = -EINVAL;
                goto err_regulator;
        }
        if (mclk_rate >= 40000000)
                max9860->psclk = 3;
        else if (mclk_rate >= 20000000)
                max9860->psclk = 2;
        else
                max9860->psclk = 1;
        max9860->pclk_rate = mclk_rate >> (max9860->psclk - 1);
        max9860->psclk <<= MAX9860_PSCLK_SHIFT;
        dev_dbg(dev, "mclk %lu pclk %lu\n", mclk_rate, max9860->pclk_rate);

        regcache_cache_bypass(max9860->regmap, true);
        for (i = 0; i < max9860_regmap.num_reg_defaults; ++i) {
                ret = regmap_write(max9860->regmap,
                                   max9860_regmap.reg_defaults[i].reg,
                                   max9860_regmap.reg_defaults[i].def);
                if (ret) {
                        dev_err(dev, "Failed to initialize register %u: %d\n",
                                max9860_regmap.reg_defaults[i].reg, ret);
                        goto err_regulator;
                }
        }
        regcache_cache_bypass(max9860->regmap, false);

        ret = regmap_read(max9860->regmap, MAX9860_INTRSTATUS, &intr);
        if (ret) {
                dev_err(dev, "Failed to clear INTRSTATUS: %d\n", ret);
                goto err_regulator;
        }

        pm_runtime_set_active(dev);
        pm_runtime_enable(dev);
        pm_runtime_idle(dev);

        ret = devm_snd_soc_register_component(dev, &max9860_component_driver,
                                              &max9860_dai, 1);
        if (ret) {
                dev_err(dev, "Failed to register CODEC: %d\n", ret);
                goto err_pm;
        }

        return 0;

err_pm:
        pm_runtime_disable(dev);
err_regulator:
        regulator_disable(max9860->dvddio);
        return ret;
}

static void max9860_remove(struct i2c_client *i2c)
{
        struct device *dev = &i2c->dev;
        struct max9860_priv *max9860 = dev_get_drvdata(dev);

        pm_runtime_disable(dev);
        regulator_disable(max9860->dvddio);
}

static const struct i2c_device_id max9860_i2c_id[] = {
        { "max9860", },
        { }
};
MODULE_DEVICE_TABLE(i2c, max9860_i2c_id);

static const struct of_device_id max9860_of_match[] = {
        { .compatible = "maxim,max9860", },
        { }
};
MODULE_DEVICE_TABLE(of, max9860_of_match);

static struct i2c_driver max9860_i2c_driver = {
        .probe          = max9860_probe,
        .remove         = max9860_remove,
        .id_table       = max9860_i2c_id,
        .driver         = {
                .name           = "max9860",
                .of_match_table = max9860_of_match,
                .pm             = pm_ptr(&max9860_pm_ops),
        },
};

module_i2c_driver(max9860_i2c_driver);

MODULE_DESCRIPTION("ASoC MAX9860 Mono Audio Voice Codec driver");
MODULE_AUTHOR("Peter Rosin <peda@axentia.se>");
MODULE_LICENSE("GPL v2");