/*
 * Nuvoton NAU8825 audio codec driver
 *
 * Copyright 2015 Google Chromium project.
 *  Author: Anatol Pomozov <anatol@chromium.org>
 * Copyright 2015 Nuvoton Technology Corp.
 *  Co-author: Meng-Huang Kuo <mhkuo@nuvoton.com>
 *
 * Licensed under the GPL-2.
 */

#include <linux/module.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/i2c.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#include <linux/clk.h>
#include <linux/acpi.h>
#include <linux/math64.h>
#include <linux/semaphore.h>

#include <sound/initval.h>
#include <sound/tlv.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/jack.h>


#include "nau8825.h"


#define NUVOTON_CODEC_DAI "nau8825-hifi"

#define NAU_FREF_MAX 13500000
#define NAU_FVCO_MAX 124000000
#define NAU_FVCO_MIN 90000000

/* cross talk suppression detection */
#define LOG10_MAGIC 646456993
#define GAIN_AUGMENT 22500
#define SIDETONE_BASE 207000

/* the maximum frequency of CLK_ADC and CLK_DAC */
#define CLK_DA_AD_MAX 6144000

static int nau8825_configure_sysclk(struct nau8825 *nau8825,
                int clk_id, unsigned int freq);

struct nau8825_fll {
        int mclk_src;
        int ratio;
        int fll_frac;
        int fll_int;
        int clk_ref_div;
};

struct nau8825_fll_attr {
        unsigned int param;
        unsigned int val;
};

/* scaling for mclk from sysclk_src output */
static const struct nau8825_fll_attr mclk_src_scaling[] = {
        { 1, 0x0 },
        { 2, 0x2 },
        { 4, 0x3 },
        { 8, 0x4 },
        { 16, 0x5 },
        { 32, 0x6 },
        { 3, 0x7 },
        { 6, 0xa },
        { 12, 0xb },
        { 24, 0xc },
        { 48, 0xd },
        { 96, 0xe },
        { 5, 0xf },
};

/* ratio for input clk freq */
static const struct nau8825_fll_attr fll_ratio[] = {
        { 512000, 0x01 },
        { 256000, 0x02 },
        { 128000, 0x04 },
        { 64000, 0x08 },
        { 32000, 0x10 },
        { 8000, 0x20 },
        { 4000, 0x40 },
};

static const struct nau8825_fll_attr fll_pre_scalar[] = {
        { 1, 0x0 },
        { 2, 0x1 },
        { 4, 0x2 },
        { 8, 0x3 },
};

/* over sampling rate */
struct nau8825_osr_attr {
        unsigned int osr;
        unsigned int clk_src;
};

static const struct nau8825_osr_attr osr_dac_sel[] = {
        { 64, 2 },      /* OSR 64, SRC 1/4 */
        { 256, 0 },     /* OSR 256, SRC 1 */
        { 128, 1 },     /* OSR 128, SRC 1/2 */
        { 0, 0 },
        { 32, 3 },      /* OSR 32, SRC 1/8 */
};

static const struct nau8825_osr_attr osr_adc_sel[] = {
        { 32, 3 },      /* OSR 32, SRC 1/8 */
        { 64, 2 },      /* OSR 64, SRC 1/4 */
        { 128, 1 },     /* OSR 128, SRC 1/2 */
        { 256, 0 },     /* OSR 256, SRC 1 */
};

static const struct reg_default nau8825_reg_defaults[] = {
        { NAU8825_REG_ENA_CTRL, 0x00ff },
        { NAU8825_REG_IIC_ADDR_SET, 0x0 },
        { NAU8825_REG_CLK_DIVIDER, 0x0050 },
        { NAU8825_REG_FLL1, 0x0 },
        { NAU8825_REG_FLL2, 0x3126 },
        { NAU8825_REG_FLL3, 0x0008 },
        { NAU8825_REG_FLL4, 0x0010 },
        { NAU8825_REG_FLL5, 0x0 },
        { NAU8825_REG_FLL6, 0x6000 },
        { NAU8825_REG_FLL_VCO_RSV, 0xf13c },
        { NAU8825_REG_HSD_CTRL, 0x000c },
        { NAU8825_REG_JACK_DET_CTRL, 0x0 },
        { NAU8825_REG_INTERRUPT_MASK, 0x0 },
        { NAU8825_REG_INTERRUPT_DIS_CTRL, 0xffff },
        { NAU8825_REG_SAR_CTRL, 0x0015 },
        { NAU8825_REG_KEYDET_CTRL, 0x0110 },
        { NAU8825_REG_VDET_THRESHOLD_1, 0x0 },
        { NAU8825_REG_VDET_THRESHOLD_2, 0x0 },
        { NAU8825_REG_VDET_THRESHOLD_3, 0x0 },
        { NAU8825_REG_VDET_THRESHOLD_4, 0x0 },
        { NAU8825_REG_GPIO34_CTRL, 0x0 },
        { NAU8825_REG_GPIO12_CTRL, 0x0 },
        { NAU8825_REG_TDM_CTRL, 0x0 },
        { NAU8825_REG_I2S_PCM_CTRL1, 0x000b },
        { NAU8825_REG_I2S_PCM_CTRL2, 0x8010 },
        { NAU8825_REG_LEFT_TIME_SLOT, 0x0 },
        { NAU8825_REG_RIGHT_TIME_SLOT, 0x0 },
        { NAU8825_REG_BIQ_CTRL, 0x0 },
        { NAU8825_REG_BIQ_COF1, 0x0 },
        { NAU8825_REG_BIQ_COF2, 0x0 },
        { NAU8825_REG_BIQ_COF3, 0x0 },
        { NAU8825_REG_BIQ_COF4, 0x0 },
        { NAU8825_REG_BIQ_COF5, 0x0 },
        { NAU8825_REG_BIQ_COF6, 0x0 },
        { NAU8825_REG_BIQ_COF7, 0x0 },
        { NAU8825_REG_BIQ_COF8, 0x0 },
        { NAU8825_REG_BIQ_COF9, 0x0 },
        { NAU8825_REG_BIQ_COF10, 0x0 },
        { NAU8825_REG_ADC_RATE, 0x0010 },
        { NAU8825_REG_DAC_CTRL1, 0x0001 },
        { NAU8825_REG_DAC_CTRL2, 0x0 },
        { NAU8825_REG_DAC_DGAIN_CTRL, 0x0 },
        { NAU8825_REG_ADC_DGAIN_CTRL, 0x00cf },
        { NAU8825_REG_MUTE_CTRL, 0x0 },
        { NAU8825_REG_HSVOL_CTRL, 0x0 },
        { NAU8825_REG_DACL_CTRL, 0x02cf },
        { NAU8825_REG_DACR_CTRL, 0x00cf },
        { NAU8825_REG_ADC_DRC_KNEE_IP12, 0x1486 },
        { NAU8825_REG_ADC_DRC_KNEE_IP34, 0x0f12 },
        { NAU8825_REG_ADC_DRC_SLOPES, 0x25ff },
        { NAU8825_REG_ADC_DRC_ATKDCY, 0x3457 },
        { NAU8825_REG_DAC_DRC_KNEE_IP12, 0x1486 },
        { NAU8825_REG_DAC_DRC_KNEE_IP34, 0x0f12 },
        { NAU8825_REG_DAC_DRC_SLOPES, 0x25f9 },
        { NAU8825_REG_DAC_DRC_ATKDCY, 0x3457 },
        { NAU8825_REG_IMM_MODE_CTRL, 0x0 },
        { NAU8825_REG_CLASSG_CTRL, 0x0 },
        { NAU8825_REG_OPT_EFUSE_CTRL, 0x0 },
        { NAU8825_REG_MISC_CTRL, 0x0 },
        { NAU8825_REG_BIAS_ADJ, 0x0 },
        { NAU8825_REG_TRIM_SETTINGS, 0x0 },
        { NAU8825_REG_ANALOG_CONTROL_1, 0x0 },
        { NAU8825_REG_ANALOG_CONTROL_2, 0x0 },
        { NAU8825_REG_ANALOG_ADC_1, 0x0011 },
        { NAU8825_REG_ANALOG_ADC_2, 0x0020 },
        { NAU8825_REG_RDAC, 0x0008 },
        { NAU8825_REG_MIC_BIAS, 0x0006 },
        { NAU8825_REG_BOOST, 0x0 },
        { NAU8825_REG_FEPGA, 0x0 },
        { NAU8825_REG_POWER_UP_CONTROL, 0x0 },
        { NAU8825_REG_CHARGE_PUMP, 0x0 },
};

/* register backup table when cross talk detection */
static struct reg_default nau8825_xtalk_baktab[] = {
        { NAU8825_REG_ADC_DGAIN_CTRL, 0x00cf },
        { NAU8825_REG_HSVOL_CTRL, 0 },
        { NAU8825_REG_DACL_CTRL, 0x00cf },
        { NAU8825_REG_DACR_CTRL, 0x02cf },
};

static const unsigned short logtable[256] = {
        0x0000, 0x0171, 0x02e0, 0x044e, 0x05ba, 0x0725, 0x088e, 0x09f7,
        0x0b5d, 0x0cc3, 0x0e27, 0x0f8a, 0x10eb, 0x124b, 0x13aa, 0x1508,
        0x1664, 0x17bf, 0x1919, 0x1a71, 0x1bc8, 0x1d1e, 0x1e73, 0x1fc6,
        0x2119, 0x226a, 0x23ba, 0x2508, 0x2656, 0x27a2, 0x28ed, 0x2a37,
        0x2b80, 0x2cc8, 0x2e0f, 0x2f54, 0x3098, 0x31dc, 0x331e, 0x345f,
        0x359f, 0x36de, 0x381b, 0x3958, 0x3a94, 0x3bce, 0x3d08, 0x3e41,
        0x3f78, 0x40af, 0x41e4, 0x4319, 0x444c, 0x457f, 0x46b0, 0x47e1,
        0x4910, 0x4a3f, 0x4b6c, 0x4c99, 0x4dc5, 0x4eef, 0x5019, 0x5142,
        0x526a, 0x5391, 0x54b7, 0x55dc, 0x5700, 0x5824, 0x5946, 0x5a68,
        0x5b89, 0x5ca8, 0x5dc7, 0x5ee5, 0x6003, 0x611f, 0x623a, 0x6355,
        0x646f, 0x6588, 0x66a0, 0x67b7, 0x68ce, 0x69e4, 0x6af8, 0x6c0c,
        0x6d20, 0x6e32, 0x6f44, 0x7055, 0x7165, 0x7274, 0x7383, 0x7490,
        0x759d, 0x76aa, 0x77b5, 0x78c0, 0x79ca, 0x7ad3, 0x7bdb, 0x7ce3,
        0x7dea, 0x7ef0, 0x7ff6, 0x80fb, 0x81ff, 0x8302, 0x8405, 0x8507,
        0x8608, 0x8709, 0x8809, 0x8908, 0x8a06, 0x8b04, 0x8c01, 0x8cfe,
        0x8dfa, 0x8ef5, 0x8fef, 0x90e9, 0x91e2, 0x92db, 0x93d2, 0x94ca,
        0x95c0, 0x96b6, 0x97ab, 0x98a0, 0x9994, 0x9a87, 0x9b7a, 0x9c6c,
        0x9d5e, 0x9e4f, 0x9f3f, 0xa02e, 0xa11e, 0xa20c, 0xa2fa, 0xa3e7,
        0xa4d4, 0xa5c0, 0xa6ab, 0xa796, 0xa881, 0xa96a, 0xaa53, 0xab3c,
        0xac24, 0xad0c, 0xadf2, 0xaed9, 0xafbe, 0xb0a4, 0xb188, 0xb26c,
        0xb350, 0xb433, 0xb515, 0xb5f7, 0xb6d9, 0xb7ba, 0xb89a, 0xb97a,
        0xba59, 0xbb38, 0xbc16, 0xbcf4, 0xbdd1, 0xbead, 0xbf8a, 0xc065,
        0xc140, 0xc21b, 0xc2f5, 0xc3cf, 0xc4a8, 0xc580, 0xc658, 0xc730,
        0xc807, 0xc8de, 0xc9b4, 0xca8a, 0xcb5f, 0xcc34, 0xcd08, 0xcddc,
        0xceaf, 0xcf82, 0xd054, 0xd126, 0xd1f7, 0xd2c8, 0xd399, 0xd469,
        0xd538, 0xd607, 0xd6d6, 0xd7a4, 0xd872, 0xd93f, 0xda0c, 0xdad9,
        0xdba5, 0xdc70, 0xdd3b, 0xde06, 0xded0, 0xdf9a, 0xe063, 0xe12c,
        0xe1f5, 0xe2bd, 0xe385, 0xe44c, 0xe513, 0xe5d9, 0xe69f, 0xe765,
        0xe82a, 0xe8ef, 0xe9b3, 0xea77, 0xeb3b, 0xebfe, 0xecc1, 0xed83,
        0xee45, 0xef06, 0xefc8, 0xf088, 0xf149, 0xf209, 0xf2c8, 0xf387,
        0xf446, 0xf505, 0xf5c3, 0xf680, 0xf73e, 0xf7fb, 0xf8b7, 0xf973,
        0xfa2f, 0xfaea, 0xfba5, 0xfc60, 0xfd1a, 0xfdd4, 0xfe8e, 0xff47
};

/**
 * nau8825_sema_acquire - acquire the semaphore of nau88l25
 * @nau8825:  component to register the codec private data with
 * @timeout: how long in jiffies to wait before failure or zero to wait
 * until release
 *
 * Attempts to acquire the semaphore with number of jiffies. If no more
 * tasks are allowed to acquire the semaphore, calling this function will
 * put the task to sleep. If the semaphore is not released within the
 * specified number of jiffies, this function returns.
 * If the semaphore is not released within the specified number of jiffies,
 * this function returns -ETIME. If the sleep is interrupted by a signal,
 * this function will return -EINTR. It returns 0 if the semaphore was
 * acquired successfully.
 *
 * Acquires the semaphore without jiffies. Try to acquire the semaphore
 * atomically. Returns 0 if the semaphore has been acquired successfully
 * or 1 if it it cannot be acquired.
 */
static int nau8825_sema_acquire(struct nau8825 *nau8825, long timeout)
{
        int ret;

        if (timeout) {
                ret = down_timeout(&nau8825->xtalk_sem, timeout);
                if (ret < 0)
                        dev_warn(nau8825->dev, "Acquire semaphore timeout\n");
        } else {
                ret = down_trylock(&nau8825->xtalk_sem);
                if (ret)
                        dev_warn(nau8825->dev, "Acquire semaphore fail\n");
        }

        return ret;
}

/**
 * nau8825_sema_release - release the semaphore of nau88l25
 * @nau8825:  component to register the codec private data with
 *
 * Release the semaphore which may be called from any context and
 * even by tasks which have never called down().
 */
static inline void nau8825_sema_release(struct nau8825 *nau8825)
{
        up(&nau8825->xtalk_sem);
}

/**
 * nau8825_sema_reset - reset the semaphore for nau88l25
 * @nau8825:  component to register the codec private data with
 *
 * Reset the counter of the semaphore. Call this function to restart
 * a new round task management.
 */
static inline void nau8825_sema_reset(struct nau8825 *nau8825)
{
        nau8825->xtalk_sem.count = 1;
}

/**
 * Ramp up the headphone volume change gradually to target level.
 *
 * @nau8825:  component to register the codec private data with
 * @vol_from: the volume to start up
 * @vol_to: the target volume
 * @step: the volume span to move on
 *
 * The headphone volume is from 0dB to minimum -54dB and -1dB per step.
 * If the volume changes sharp, there is a pop noise heard in headphone. We
 * provide the function to ramp up the volume up or down by delaying 10ms
 * per step.
 */
static void nau8825_hpvol_ramp(struct nau8825 *nau8825,
        unsigned int vol_from, unsigned int vol_to, unsigned int step)
{
        unsigned int value, volume, ramp_up, from, to;

        if (vol_from == vol_to || step == 0) {
                return;
        } else if (vol_from < vol_to) {
                ramp_up = true;
                from = vol_from;
                to = vol_to;
        } else {
                ramp_up = false;
                from = vol_to;
                to = vol_from;
        }
        /* only handle volume from 0dB to minimum -54dB */
        if (to > NAU8825_HP_VOL_MIN)
                to = NAU8825_HP_VOL_MIN;

        for (volume = from; volume < to; volume += step) {
                if (ramp_up)
                        value = volume;
                else
                        value = to - volume + from;
                regmap_update_bits(nau8825->regmap, NAU8825_REG_HSVOL_CTRL,
                        NAU8825_HPL_VOL_MASK | NAU8825_HPR_VOL_MASK,
                        (value << NAU8825_HPL_VOL_SFT) | value);
                usleep_range(10000, 10500);
        }
        if (ramp_up)
                value = to;
        else
                value = from;
        regmap_update_bits(nau8825->regmap, NAU8825_REG_HSVOL_CTRL,
                NAU8825_HPL_VOL_MASK | NAU8825_HPR_VOL_MASK,
                (value << NAU8825_HPL_VOL_SFT) | value);
}

/**
 * Computes log10 of a value; the result is round off to 3 decimal. This func-
 * tion takes reference to dvb-math. The source code locates as the following.
 * Linux/drivers/media/dvb-core/dvb_math.c
 *
 * return log10(value) * 1000
 */
static u32 nau8825_intlog10_dec3(u32 value)
{
        u32 msb, logentry, significand, interpolation, log10val;
        u64 log2val;

        /* first detect the msb (count begins at 0) */
        msb = fls(value) - 1;
        /**
         *      now we use a logtable after the following method:
         *
         *      log2(2^x * y) * 2^24 = x * 2^24 + log2(y) * 2^24
         *      where x = msb and therefore 1 <= y < 2
         *      first y is determined by shifting the value left
         *      so that msb is bit 31
         *              0x00231f56 -> 0x8C7D5800
         *      the result is y * 2^31 -> "significand"
         *      then the highest 9 bits are used for a table lookup
         *      the highest bit is discarded because it's always set
         *      the highest nine bits in our example are 100011000
         *      so we would use the entry 0x18
         */
        significand = value << (31 - msb);
        logentry = (significand >> 23) & 0xff;
        /**
         *      last step we do is interpolation because of the
         *      limitations of the log table the error is that part of
         *      the significand which isn't used for lookup then we
         *      compute the ratio between the error and the next table entry
         *      and interpolate it between the log table entry used and the
         *      next one the biggest error possible is 0x7fffff
         *      (in our example it's 0x7D5800)
         *      needed value for next table entry is 0x800000
         *      so the interpolation is
         *      (error / 0x800000) * (logtable_next - logtable_current)
         *      in the implementation the division is moved to the end for
         *      better accuracy there is also an overflow correction if
         *      logtable_next is 256
         */
        interpolation = ((significand & 0x7fffff) *
                ((logtable[(logentry + 1) & 0xff] -
                logtable[logentry]) & 0xffff)) >> 15;

        log2val = ((msb << 24) + (logtable[logentry] << 8) + interpolation);
        /**
         *      log10(x) = log2(x) * log10(2)
         */
        log10val = (log2val * LOG10_MAGIC) >> 31;
        /**
         *      the result is round off to 3 decimal
         */
        return log10val / ((1 << 24) / 1000);
}

/**
 * computes cross talk suppression sidetone gain.
 *
 * @sig_org: orignal signal level
 * @sig_cros: cross talk signal level
 *
 * The orignal and cross talk signal vlues need to be characterized.
 * Once these values have been characterized, this sidetone value
 * can be converted to decibel with the equation below.
 * sidetone = 20 * log (original signal level / crosstalk signal level)
 *
 * return cross talk sidetone gain
 */
static u32 nau8825_xtalk_sidetone(u32 sig_org, u32 sig_cros)
{
        u32 gain, sidetone;

        if (unlikely(sig_org == 0) || unlikely(sig_cros == 0)) {
                WARN_ON(1);
                return 0;
        }

        sig_org = nau8825_intlog10_dec3(sig_org);
        sig_cros = nau8825_intlog10_dec3(sig_cros);
        if (sig_org >= sig_cros)
                gain = (sig_org - sig_cros) * 20 + GAIN_AUGMENT;
        else
                gain = (sig_cros - sig_org) * 20 + GAIN_AUGMENT;
        sidetone = SIDETONE_BASE - gain * 2;
        sidetone /= 1000;

        return sidetone;
}

static int nau8825_xtalk_baktab_index_by_reg(unsigned int reg)
{
        int index;

        for (index = 0; index < ARRAY_SIZE(nau8825_xtalk_baktab); index++)
                if (nau8825_xtalk_baktab[index].reg == reg)
                        return index;
        return -EINVAL;
}

static void nau8825_xtalk_backup(struct nau8825 *nau8825)
{
        int i;

        if (nau8825->xtalk_baktab_initialized)
                return;

        /* Backup some register values to backup table */
        for (i = 0; i < ARRAY_SIZE(nau8825_xtalk_baktab); i++)
                regmap_read(nau8825->regmap, nau8825_xtalk_baktab[i].reg,
                                &nau8825_xtalk_baktab[i].def);

        nau8825->xtalk_baktab_initialized = true;
}

static void nau8825_xtalk_restore(struct nau8825 *nau8825, bool cause_cancel)
{
        int i, volume;

        if (!nau8825->xtalk_baktab_initialized)
                return;

        /* Restore register values from backup table; When the driver restores
         * the headphone volume in XTALK_DONE state, it needs recover to
         * original level gradually with 3dB per step for less pop noise.
         * Otherwise, the restore should do ASAP.
         */
        for (i = 0; i < ARRAY_SIZE(nau8825_xtalk_baktab); i++) {
                if (!cause_cancel && nau8825_xtalk_baktab[i].reg ==
                        NAU8825_REG_HSVOL_CTRL) {
                        /* Ramping up the volume change to reduce pop noise */
                        volume = nau8825_xtalk_baktab[i].def &
                                NAU8825_HPR_VOL_MASK;
                        nau8825_hpvol_ramp(nau8825, 0, volume, 3);
                        continue;
                }
                regmap_write(nau8825->regmap, nau8825_xtalk_baktab[i].reg,
                                nau8825_xtalk_baktab[i].def);
        }

        nau8825->xtalk_baktab_initialized = false;
}

static void nau8825_xtalk_prepare_dac(struct nau8825 *nau8825)
{
        /* Enable power of DAC path */
        regmap_update_bits(nau8825->regmap, NAU8825_REG_ENA_CTRL,
                NAU8825_ENABLE_DACR | NAU8825_ENABLE_DACL |
                NAU8825_ENABLE_ADC | NAU8825_ENABLE_ADC_CLK |
                NAU8825_ENABLE_DAC_CLK, NAU8825_ENABLE_DACR |
                NAU8825_ENABLE_DACL | NAU8825_ENABLE_ADC |
                NAU8825_ENABLE_ADC_CLK | NAU8825_ENABLE_DAC_CLK);
        /* Prevent startup click by letting charge pump to ramp up and
         * change bump enable
         */
        regmap_update_bits(nau8825->regmap, NAU8825_REG_CHARGE_PUMP,
                NAU8825_JAMNODCLOW | NAU8825_CHANRGE_PUMP_EN,
                NAU8825_JAMNODCLOW | NAU8825_CHANRGE_PUMP_EN);
        /* Enable clock sync of DAC and DAC clock */
        regmap_update_bits(nau8825->regmap, NAU8825_REG_RDAC,
                NAU8825_RDAC_EN | NAU8825_RDAC_CLK_EN |
                NAU8825_RDAC_FS_BCLK_ENB,
                NAU8825_RDAC_EN | NAU8825_RDAC_CLK_EN);
        /* Power up output driver with 2 stage */
        regmap_update_bits(nau8825->regmap, NAU8825_REG_POWER_UP_CONTROL,
                NAU8825_POWERUP_INTEGR_R | NAU8825_POWERUP_INTEGR_L |
                NAU8825_POWERUP_DRV_IN_R | NAU8825_POWERUP_DRV_IN_L,
                NAU8825_POWERUP_INTEGR_R | NAU8825_POWERUP_INTEGR_L |
                NAU8825_POWERUP_DRV_IN_R | NAU8825_POWERUP_DRV_IN_L);
        regmap_update_bits(nau8825->regmap, NAU8825_REG_POWER_UP_CONTROL,
                NAU8825_POWERUP_HP_DRV_R | NAU8825_POWERUP_HP_DRV_L,
                NAU8825_POWERUP_HP_DRV_R | NAU8825_POWERUP_HP_DRV_L);
        /* HP outputs not shouted to ground  */
        regmap_update_bits(nau8825->regmap, NAU8825_REG_HSD_CTRL,
                NAU8825_SPKR_DWN1R | NAU8825_SPKR_DWN1L, 0);
        /* Enable HP boost driver */
        regmap_update_bits(nau8825->regmap, NAU8825_REG_BOOST,
                NAU8825_HP_BOOST_DIS, NAU8825_HP_BOOST_DIS);
        /* Enable class G compare path to supply 1.8V or 0.9V. */
        regmap_update_bits(nau8825->regmap, NAU8825_REG_CLASSG_CTRL,
                NAU8825_CLASSG_LDAC_EN | NAU8825_CLASSG_RDAC_EN,
                NAU8825_CLASSG_LDAC_EN | NAU8825_CLASSG_RDAC_EN);
}

static void nau8825_xtalk_prepare_adc(struct nau8825 *nau8825)
{
        /* Power up left ADC and raise 5dB than Vmid for Vref  */
        regmap_update_bits(nau8825->regmap, NAU8825_REG_ANALOG_ADC_2,
                NAU8825_POWERUP_ADCL | NAU8825_ADC_VREFSEL_MASK,
                NAU8825_POWERUP_ADCL | NAU8825_ADC_VREFSEL_VMID_PLUS_0_5DB);
}

static void nau8825_xtalk_clock(struct nau8825 *nau8825)
{
        /* Recover FLL default value */
        regmap_write(nau8825->regmap, NAU8825_REG_FLL1, 0x0);
        regmap_write(nau8825->regmap, NAU8825_REG_FLL2, 0x3126);
        regmap_write(nau8825->regmap, NAU8825_REG_FLL3, 0x0008);
        regmap_write(nau8825->regmap, NAU8825_REG_FLL4, 0x0010);
        regmap_write(nau8825->regmap, NAU8825_REG_FLL5, 0x0);
        regmap_write(nau8825->regmap, NAU8825_REG_FLL6, 0x6000);
        /* Enable internal VCO clock for detection signal generated */
        regmap_update_bits(nau8825->regmap, NAU8825_REG_CLK_DIVIDER,
                NAU8825_CLK_SRC_MASK, NAU8825_CLK_SRC_VCO);
        regmap_update_bits(nau8825->regmap, NAU8825_REG_FLL6, NAU8825_DCO_EN,
                NAU8825_DCO_EN);
        /* Given specific clock frequency of internal clock to
         * generate signal.
         */
        regmap_update_bits(nau8825->regmap, NAU8825_REG_CLK_DIVIDER,
                NAU8825_CLK_MCLK_SRC_MASK, 0xf);
        regmap_update_bits(nau8825->regmap, NAU8825_REG_FLL1,
                NAU8825_FLL_RATIO_MASK, 0x10);
}

static void nau8825_xtalk_prepare(struct nau8825 *nau8825)
{
        int volume, index;

        /* Backup those registers changed by cross talk detection */
        nau8825_xtalk_backup(nau8825);
        /* Config IIS as master to output signal by codec */
        regmap_update_bits(nau8825->regmap, NAU8825_REG_I2S_PCM_CTRL2,
                NAU8825_I2S_MS_MASK | NAU8825_I2S_LRC_DIV_MASK |
                NAU8825_I2S_BLK_DIV_MASK, NAU8825_I2S_MS_MASTER |
                (0x2 << NAU8825_I2S_LRC_DIV_SFT) | 0x1);
        /* Ramp up headphone volume to 0dB to get better performance and
         * avoid pop noise in headphone.
         */
        index = nau8825_xtalk_baktab_index_by_reg(NAU8825_REG_HSVOL_CTRL);
        if (index != -EINVAL) {
                volume = nau8825_xtalk_baktab[index].def &
                                NAU8825_HPR_VOL_MASK;
                nau8825_hpvol_ramp(nau8825, volume, 0, 3);
        }
        nau8825_xtalk_clock(nau8825);
        nau8825_xtalk_prepare_dac(nau8825);
        nau8825_xtalk_prepare_adc(nau8825);
        /* Config channel path and digital gain */
        regmap_update_bits(nau8825->regmap, NAU8825_REG_DACL_CTRL,
                NAU8825_DACL_CH_SEL_MASK | NAU8825_DACL_CH_VOL_MASK,
                NAU8825_DACL_CH_SEL_L | 0xab);
        regmap_update_bits(nau8825->regmap, NAU8825_REG_DACR_CTRL,
                NAU8825_DACR_CH_SEL_MASK | NAU8825_DACR_CH_VOL_MASK,
                NAU8825_DACR_CH_SEL_R | 0xab);
        /* Config cross talk parameters and generate the 23Hz sine wave with
         * 1/16 full scale of signal level for impedance measurement.
         */
        regmap_update_bits(nau8825->regmap, NAU8825_REG_IMM_MODE_CTRL,
                NAU8825_IMM_THD_MASK | NAU8825_IMM_GEN_VOL_MASK |
                NAU8825_IMM_CYC_MASK | NAU8825_IMM_DAC_SRC_MASK,
                (0x9 << NAU8825_IMM_THD_SFT) | NAU8825_IMM_GEN_VOL_1_16th |
                NAU8825_IMM_CYC_8192 | NAU8825_IMM_DAC_SRC_SIN);
        /* RMS intrruption enable */
        regmap_update_bits(nau8825->regmap,
                NAU8825_REG_INTERRUPT_MASK, NAU8825_IRQ_RMS_EN, 0);
        /* Power up left and right DAC */
        regmap_update_bits(nau8825->regmap, NAU8825_REG_CHARGE_PUMP,
                NAU8825_POWER_DOWN_DACR | NAU8825_POWER_DOWN_DACL, 0);
}

static void nau8825_xtalk_clean_dac(struct nau8825 *nau8825)
{
        /* Disable HP boost driver */
        regmap_update_bits(nau8825->regmap, NAU8825_REG_BOOST,
                NAU8825_HP_BOOST_DIS, 0);
        /* HP outputs shouted to ground  */
        regmap_update_bits(nau8825->regmap, NAU8825_REG_HSD_CTRL,
                NAU8825_SPKR_DWN1R | NAU8825_SPKR_DWN1L,
                NAU8825_SPKR_DWN1R | NAU8825_SPKR_DWN1L);
        /* Power down left and right DAC */
        regmap_update_bits(nau8825->regmap, NAU8825_REG_CHARGE_PUMP,
                NAU8825_POWER_DOWN_DACR | NAU8825_POWER_DOWN_DACL,
                NAU8825_POWER_DOWN_DACR | NAU8825_POWER_DOWN_DACL);
        /* Enable the TESTDAC and  disable L/R HP impedance */
        regmap_update_bits(nau8825->regmap, NAU8825_REG_BIAS_ADJ,
                NAU8825_BIAS_HPR_IMP | NAU8825_BIAS_HPL_IMP |
                NAU8825_BIAS_TESTDAC_EN, NAU8825_BIAS_TESTDAC_EN);
        /* Power down output driver with 2 stage */
        regmap_update_bits(nau8825->regmap, NAU8825_REG_POWER_UP_CONTROL,
                NAU8825_POWERUP_HP_DRV_R | NAU8825_POWERUP_HP_DRV_L, 0);
        regmap_update_bits(nau8825->regmap, NAU8825_REG_POWER_UP_CONTROL,
                NAU8825_POWERUP_INTEGR_R | NAU8825_POWERUP_INTEGR_L |
                NAU8825_POWERUP_DRV_IN_R | NAU8825_POWERUP_DRV_IN_L, 0);
        /* Disable clock sync of DAC and DAC clock */
        regmap_update_bits(nau8825->regmap, NAU8825_REG_RDAC,
                NAU8825_RDAC_EN | NAU8825_RDAC_CLK_EN, 0);
        /* Disable charge pump ramp up function and change bump */
        regmap_update_bits(nau8825->regmap, NAU8825_REG_CHARGE_PUMP,
                NAU8825_JAMNODCLOW | NAU8825_CHANRGE_PUMP_EN, 0);
        /* Disable power of DAC path */
        regmap_update_bits(nau8825->regmap, NAU8825_REG_ENA_CTRL,
                NAU8825_ENABLE_DACR | NAU8825_ENABLE_DACL |
                NAU8825_ENABLE_ADC_CLK | NAU8825_ENABLE_DAC_CLK, 0);
        if (!nau8825->irq)
                regmap_update_bits(nau8825->regmap,
                        NAU8825_REG_ENA_CTRL, NAU8825_ENABLE_ADC, 0);
}

static void nau8825_xtalk_clean_adc(struct nau8825 *nau8825)
{
        /* Power down left ADC and restore voltage to Vmid */
        regmap_update_bits(nau8825->regmap, NAU8825_REG_ANALOG_ADC_2,
                NAU8825_POWERUP_ADCL | NAU8825_ADC_VREFSEL_MASK, 0);
}

static void nau8825_xtalk_clean(struct nau8825 *nau8825, bool cause_cancel)
{
        /* Enable internal VCO needed for interruptions */
        nau8825_configure_sysclk(nau8825, NAU8825_CLK_INTERNAL, 0);
        nau8825_xtalk_clean_dac(nau8825);
        nau8825_xtalk_clean_adc(nau8825);
        /* Clear cross talk parameters and disable */
        regmap_write(nau8825->regmap, NAU8825_REG_IMM_MODE_CTRL, 0);
        /* RMS intrruption disable */
        regmap_update_bits(nau8825->regmap, NAU8825_REG_INTERRUPT_MASK,
                NAU8825_IRQ_RMS_EN, NAU8825_IRQ_RMS_EN);
        /* Recover default value for IIS */
        regmap_update_bits(nau8825->regmap, NAU8825_REG_I2S_PCM_CTRL2,
                NAU8825_I2S_MS_MASK | NAU8825_I2S_LRC_DIV_MASK |
                NAU8825_I2S_BLK_DIV_MASK, NAU8825_I2S_MS_SLAVE);
        /* Restore value of specific register for cross talk */
        nau8825_xtalk_restore(nau8825, cause_cancel);
}

static void nau8825_xtalk_imm_start(struct nau8825 *nau8825, int vol)
{
        /* Apply ADC volume for better cross talk performance */
        regmap_update_bits(nau8825->regmap, NAU8825_REG_ADC_DGAIN_CTRL,
                                NAU8825_ADC_DIG_VOL_MASK, vol);
        /* Disables JKTIP(HPL) DAC channel for right to left measurement.
         * Do it before sending signal in order to erase pop noise.
         */
        regmap_update_bits(nau8825->regmap, NAU8825_REG_BIAS_ADJ,
                NAU8825_BIAS_TESTDACR_EN | NAU8825_BIAS_TESTDACL_EN,
                NAU8825_BIAS_TESTDACL_EN);
        switch (nau8825->xtalk_state) {
        case NAU8825_XTALK_HPR_R2L:
                /* Enable right headphone impedance */
                regmap_update_bits(nau8825->regmap, NAU8825_REG_BIAS_ADJ,
                        NAU8825_BIAS_HPR_IMP | NAU8825_BIAS_HPL_IMP,
                        NAU8825_BIAS_HPR_IMP);
                break;
        case NAU8825_XTALK_HPL_R2L:
                /* Enable left headphone impedance */
                regmap_update_bits(nau8825->regmap, NAU8825_REG_BIAS_ADJ,
                        NAU8825_BIAS_HPR_IMP | NAU8825_BIAS_HPL_IMP,
                        NAU8825_BIAS_HPL_IMP);
                break;
        default:
                break;
        }
        msleep(100);
        /* Impedance measurement mode enable */
        regmap_update_bits(nau8825->regmap, NAU8825_REG_IMM_MODE_CTRL,
                                NAU8825_IMM_EN, NAU8825_IMM_EN);
}

static void nau8825_xtalk_imm_stop(struct nau8825 *nau8825)
{
        /* Impedance measurement mode disable */
        regmap_update_bits(nau8825->regmap,
                NAU8825_REG_IMM_MODE_CTRL, NAU8825_IMM_EN, 0);
}

/* The cross talk measurement function can reduce cross talk across the
 * JKTIP(HPL) and JKR1(HPR) outputs which measures the cross talk signal
 * level to determine what cross talk reduction gain is. This system works by
 * sending a 23Hz -24dBV sine wave into the headset output DAC and through
 * the PGA. The output of the PGA is then connected to an internal current
 * sense which measures the attenuated 23Hz signal and passing the output to
 * an ADC which converts the measurement to a binary code. With two separated
 * measurement, one for JKR1(HPR) and the other JKTIP(HPL), measurement data
 * can be separated read in IMM_RMS_L for HSR and HSL after each measurement.
 * Thus, the measurement function has four states to complete whole sequence.
 * 1. Prepare state : Prepare the resource for detection and transfer to HPR
 *     IMM stat to make JKR1(HPR) impedance measure.
 * 2. HPR IMM state : Read out orignal signal level of JKR1(HPR) and transfer
 *     to HPL IMM state to make JKTIP(HPL) impedance measure.
 * 3. HPL IMM state : Read out cross talk signal level of JKTIP(HPL) and
 *     transfer to IMM state to determine suppression sidetone gain.
 * 4. IMM state : Computes cross talk suppression sidetone gain with orignal
 *     and cross talk signal level. Apply this gain and then restore codec
 *     configuration. Then transfer to Done state for ending.
 */
static void nau8825_xtalk_measure(struct nau8825 *nau8825)
{
        u32 sidetone;

        switch (nau8825->xtalk_state) {
        case NAU8825_XTALK_PREPARE:
                /* In prepare state, set up clock, intrruption, DAC path, ADC
                 * path and cross talk detection parameters for preparation.
                 */
                nau8825_xtalk_prepare(nau8825);
                msleep(280);
                /* Trigger right headphone impedance detection */
                nau8825->xtalk_state = NAU8825_XTALK_HPR_R2L;
                nau8825_xtalk_imm_start(nau8825, 0x00d2);
                break;
        case NAU8825_XTALK_HPR_R2L:
                /* In right headphone IMM state, read out right headphone
                 * impedance measure result, and then start up left side.
                 */
                regmap_read(nau8825->regmap, NAU8825_REG_IMM_RMS_L,
                        &nau8825->imp_rms[NAU8825_XTALK_HPR_R2L]);
                dev_dbg(nau8825->dev, "HPR_R2L imm: %x\n",
                        nau8825->imp_rms[NAU8825_XTALK_HPR_R2L]);
                /* Disable then re-enable IMM mode to update */
                nau8825_xtalk_imm_stop(nau8825);
                /* Trigger left headphone impedance detection */
                nau8825->xtalk_state = NAU8825_XTALK_HPL_R2L;
                nau8825_xtalk_imm_start(nau8825, 0x00ff);
                break;
        case NAU8825_XTALK_HPL_R2L:
                /* In left headphone IMM state, read out left headphone
                 * impedance measure result, and delay some time to wait
                 * detection sine wave output finish. Then, we can calculate
                 * the cross talk suppresstion side tone according to the L/R
                 * headphone imedance.
                 */
                regmap_read(nau8825->regmap, NAU8825_REG_IMM_RMS_L,
                        &nau8825->imp_rms[NAU8825_XTALK_HPL_R2L]);
                dev_dbg(nau8825->dev, "HPL_R2L imm: %x\n",
                        nau8825->imp_rms[NAU8825_XTALK_HPL_R2L]);
                nau8825_xtalk_imm_stop(nau8825);
                msleep(150);
                nau8825->xtalk_state = NAU8825_XTALK_IMM;
                break;
        case NAU8825_XTALK_IMM:
                /* In impedance measure state, the orignal and cross talk
                 * signal level vlues are ready. The side tone gain is deter-
                 * mined with these signal level. After all, restore codec
                 * configuration.
                 */
                sidetone = nau8825_xtalk_sidetone(
                        nau8825->imp_rms[NAU8825_XTALK_HPR_R2L],
                        nau8825->imp_rms[NAU8825_XTALK_HPL_R2L]);
                dev_dbg(nau8825->dev, "cross talk sidetone: %x\n", sidetone);
                regmap_write(nau8825->regmap, NAU8825_REG_DAC_DGAIN_CTRL,
                                        (sidetone << 8) | sidetone);
                nau8825_xtalk_clean(nau8825, false);
                nau8825->xtalk_state = NAU8825_XTALK_DONE;
                break;
        default:
                break;
        }
}

static void nau8825_xtalk_work(struct work_struct *work)
{
        struct nau8825 *nau8825 = container_of(
                work, struct nau8825, xtalk_work);

        nau8825_xtalk_measure(nau8825);
        /* To determine the cross talk side tone gain when reach
         * the impedance measure state.
         */
        if (nau8825->xtalk_state == NAU8825_XTALK_IMM)
                nau8825_xtalk_measure(nau8825);

        /* Delay jack report until cross talk detection process
         * completed. It can avoid application to do playback
         * preparation before cross talk detection is still working.
         * Meanwhile, the protection of the cross talk detection
         * is released.
         */
        if (nau8825->xtalk_state == NAU8825_XTALK_DONE) {
                snd_soc_jack_report(nau8825->jack, nau8825->xtalk_event,
                                nau8825->xtalk_event_mask);
                nau8825_sema_release(nau8825);
                nau8825->xtalk_protect = false;
        }
}

static void nau8825_xtalk_cancel(struct nau8825 *nau8825)
{
        /* If the crosstalk is eanbled and the process is on going,
         * the driver forces to cancel the crosstalk task and
         * restores the configuration to original status.
         */
        if (nau8825->xtalk_enable && nau8825->xtalk_state !=
                NAU8825_XTALK_DONE) {
                cancel_work_sync(&nau8825->xtalk_work);
                nau8825_xtalk_clean(nau8825, true);
        }
        /* Reset parameters for cross talk suppression function */
        nau8825_sema_reset(nau8825);
        nau8825->xtalk_state = NAU8825_XTALK_DONE;
        nau8825->xtalk_protect = false;
}

static bool nau8825_readable_reg(struct device *dev, unsigned int reg)
{
        switch (reg) {
        case NAU8825_REG_ENA_CTRL ... NAU8825_REG_FLL_VCO_RSV:
        case NAU8825_REG_HSD_CTRL ... NAU8825_REG_JACK_DET_CTRL:
        case NAU8825_REG_INTERRUPT_MASK ... NAU8825_REG_KEYDET_CTRL:
        case NAU8825_REG_VDET_THRESHOLD_1 ... NAU8825_REG_DACR_CTRL:
        case NAU8825_REG_ADC_DRC_KNEE_IP12 ... NAU8825_REG_ADC_DRC_ATKDCY:
        case NAU8825_REG_DAC_DRC_KNEE_IP12 ... NAU8825_REG_DAC_DRC_ATKDCY:
        case NAU8825_REG_IMM_MODE_CTRL ... NAU8825_REG_IMM_RMS_R:
        case NAU8825_REG_CLASSG_CTRL ... NAU8825_REG_OPT_EFUSE_CTRL:
        case NAU8825_REG_MISC_CTRL:
        case NAU8825_REG_I2C_DEVICE_ID ... NAU8825_REG_SARDOUT_RAM_STATUS:
        case NAU8825_REG_BIAS_ADJ:
        case NAU8825_REG_TRIM_SETTINGS ... NAU8825_REG_ANALOG_CONTROL_2:
        case NAU8825_REG_ANALOG_ADC_1 ... NAU8825_REG_MIC_BIAS:
        case NAU8825_REG_BOOST ... NAU8825_REG_FEPGA:
        case NAU8825_REG_POWER_UP_CONTROL ... NAU8825_REG_GENERAL_STATUS:
                return true;
        default:
                return false;
        }

}

static bool nau8825_writeable_reg(struct device *dev, unsigned int reg)
{
        switch (reg) {
        case NAU8825_REG_RESET ... NAU8825_REG_FLL_VCO_RSV:
        case NAU8825_REG_HSD_CTRL ... NAU8825_REG_JACK_DET_CTRL:
        case NAU8825_REG_INTERRUPT_MASK:
        case NAU8825_REG_INT_CLR_KEY_STATUS ... NAU8825_REG_KEYDET_CTRL:
        case NAU8825_REG_VDET_THRESHOLD_1 ... NAU8825_REG_DACR_CTRL:
        case NAU8825_REG_ADC_DRC_KNEE_IP12 ... NAU8825_REG_ADC_DRC_ATKDCY:
        case NAU8825_REG_DAC_DRC_KNEE_IP12 ... NAU8825_REG_DAC_DRC_ATKDCY:
        case NAU8825_REG_IMM_MODE_CTRL:
        case NAU8825_REG_CLASSG_CTRL ... NAU8825_REG_OPT_EFUSE_CTRL:
        case NAU8825_REG_MISC_CTRL:
        case NAU8825_REG_BIAS_ADJ:
        case NAU8825_REG_TRIM_SETTINGS ... NAU8825_REG_ANALOG_CONTROL_2:
        case NAU8825_REG_ANALOG_ADC_1 ... NAU8825_REG_MIC_BIAS:
        case NAU8825_REG_BOOST ... NAU8825_REG_FEPGA:
        case NAU8825_REG_POWER_UP_CONTROL ... NAU8825_REG_CHARGE_PUMP:
                return true;
        default:
                return false;
        }
}

static bool nau8825_volatile_reg(struct device *dev, unsigned int reg)
{
        switch (reg) {
        case NAU8825_REG_RESET:
        case NAU8825_REG_IRQ_STATUS:
        case NAU8825_REG_INT_CLR_KEY_STATUS:
        case NAU8825_REG_IMM_RMS_L:
        case NAU8825_REG_IMM_RMS_R:
        case NAU8825_REG_I2C_DEVICE_ID:
        case NAU8825_REG_SARDOUT_RAM_STATUS:
        case NAU8825_REG_CHARGE_PUMP_INPUT_READ:
        case NAU8825_REG_GENERAL_STATUS:
        case NAU8825_REG_BIQ_CTRL ... NAU8825_REG_BIQ_COF10:
                return true;
        default:
                return false;
        }
}

static int nau8825_adc_event(struct snd_soc_dapm_widget *w,
                struct snd_kcontrol *kcontrol, int event)
{
        struct snd_soc_component *component = snd_soc_dapm_to_component(w->dapm);
        struct nau8825 *nau8825 = snd_soc_component_get_drvdata(component);

        switch (event) {
        case SND_SOC_DAPM_POST_PMU:
                msleep(125);
                regmap_update_bits(nau8825->regmap, NAU8825_REG_ENA_CTRL,
                        NAU8825_ENABLE_ADC, NAU8825_ENABLE_ADC);
                break;
        case SND_SOC_DAPM_POST_PMD:
                if (!nau8825->irq)
                        regmap_update_bits(nau8825->regmap,
                                NAU8825_REG_ENA_CTRL, NAU8825_ENABLE_ADC, 0);
                break;
        default:
                return -EINVAL;
        }

        return 0;
}

static int nau8825_pump_event(struct snd_soc_dapm_widget *w,
        struct snd_kcontrol *kcontrol, int event)
{
        struct snd_soc_component *component = snd_soc_dapm_to_component(w->dapm);
        struct nau8825 *nau8825 = snd_soc_component_get_drvdata(component);

        switch (event) {
        case SND_SOC_DAPM_POST_PMU:
                /* Prevent startup click by letting charge pump to ramp up */
                msleep(10);
                regmap_update_bits(nau8825->regmap, NAU8825_REG_CHARGE_PUMP,
                        NAU8825_JAMNODCLOW, NAU8825_JAMNODCLOW);
                break;
        case SND_SOC_DAPM_PRE_PMD:
                regmap_update_bits(nau8825->regmap, NAU8825_REG_CHARGE_PUMP,
                        NAU8825_JAMNODCLOW, 0);
                break;
        default:
                return -EINVAL;
        }

        return 0;
}

static int nau8825_output_dac_event(struct snd_soc_dapm_widget *w,
        struct snd_kcontrol *kcontrol, int event)
{
        struct snd_soc_component *component = snd_soc_dapm_to_component(w->dapm);
        struct nau8825 *nau8825 = snd_soc_component_get_drvdata(component);

        switch (event) {
        case SND_SOC_DAPM_PRE_PMU:
                /* Disables the TESTDAC to let DAC signal pass through. */
                regmap_update_bits(nau8825->regmap, NAU8825_REG_BIAS_ADJ,
                        NAU8825_BIAS_TESTDAC_EN, 0);
                break;
        case SND_SOC_DAPM_POST_PMD:
                regmap_update_bits(nau8825->regmap, NAU8825_REG_BIAS_ADJ,
                        NAU8825_BIAS_TESTDAC_EN, NAU8825_BIAS_TESTDAC_EN);
                break;
        default:
                return -EINVAL;
        }

        return 0;
}

static int nau8825_biq_coeff_get(struct snd_kcontrol *kcontrol,
                                     struct snd_ctl_elem_value *ucontrol)
{
        struct snd_soc_component *component = snd_kcontrol_chip(kcontrol);
        struct soc_bytes_ext *params = (void *)kcontrol->private_value;

        if (!component->regmap)
                return -EINVAL;

        regmap_raw_read(component->regmap, NAU8825_REG_BIQ_COF1,
                ucontrol->value.bytes.data, params->max);
        return 0;
}

static int nau8825_biq_coeff_put(struct snd_kcontrol *kcontrol,
                                     struct snd_ctl_elem_value *ucontrol)

{
        struct snd_soc_component *component = snd_kcontrol_chip(kcontrol);
        struct soc_bytes_ext *params = (void *)kcontrol->private_value;
        void *data;

        if (!component->regmap)
                return -EINVAL;

        data = kmemdup(ucontrol->value.bytes.data,
                params->max, GFP_KERNEL | GFP_DMA);
        if (!data)
                return -ENOMEM;

        regmap_update_bits(component->regmap, NAU8825_REG_BIQ_CTRL,
                NAU8825_BIQ_WRT_EN, 0);
        regmap_raw_write(component->regmap, NAU8825_REG_BIQ_COF1,
                data, params->max);
        regmap_update_bits(component->regmap, NAU8825_REG_BIQ_CTRL,
                NAU8825_BIQ_WRT_EN, NAU8825_BIQ_WRT_EN);

        kfree(data);
        return 0;
}

static const char * const nau8825_biq_path[] = {
        "ADC", "DAC"
};

static const struct soc_enum nau8825_biq_path_enum =
        SOC_ENUM_SINGLE(NAU8825_REG_BIQ_CTRL, NAU8825_BIQ_PATH_SFT,
                ARRAY_SIZE(nau8825_biq_path), nau8825_biq_path);

static const char * const nau8825_adc_decimation[] = {
        "32", "64", "128", "256"
};

static const struct soc_enum nau8825_adc_decimation_enum =
        SOC_ENUM_SINGLE(NAU8825_REG_ADC_RATE, NAU8825_ADC_SYNC_DOWN_SFT,
                ARRAY_SIZE(nau8825_adc_decimation), nau8825_adc_decimation);

static const char * const nau8825_dac_oversampl[] = {
        "64", "256", "128", "", "32"
};

static const struct soc_enum nau8825_dac_oversampl_enum =
        SOC_ENUM_SINGLE(NAU8825_REG_DAC_CTRL1, NAU8825_DAC_OVERSAMPLE_SFT,
                ARRAY_SIZE(nau8825_dac_oversampl), nau8825_dac_oversampl);

static const DECLARE_TLV_DB_MINMAX_MUTE(adc_vol_tlv, -10300, 2400);
static const DECLARE_TLV_DB_MINMAX_MUTE(sidetone_vol_tlv, -4200, 0);
static const DECLARE_TLV_DB_MINMAX(dac_vol_tlv, -5400, 0);
static const DECLARE_TLV_DB_MINMAX(fepga_gain_tlv, -100, 3600);
static const DECLARE_TLV_DB_MINMAX_MUTE(crosstalk_vol_tlv, -9600, 2400);

static const struct snd_kcontrol_new nau8825_controls[] = {
        SOC_SINGLE_TLV("Mic Volume", NAU8825_REG_ADC_DGAIN_CTRL,
                0, 0xff, 0, adc_vol_tlv),
        SOC_DOUBLE_TLV("Headphone Bypass Volume", NAU8825_REG_ADC_DGAIN_CTRL,
                12, 8, 0x0f, 0, sidetone_vol_tlv),
        SOC_DOUBLE_TLV("Headphone Volume", NAU8825_REG_HSVOL_CTRL,
                6, 0, 0x3f, 1, dac_vol_tlv),
        SOC_SINGLE_TLV("Frontend PGA Volume", NAU8825_REG_POWER_UP_CONTROL,
                8, 37, 0, fepga_gain_tlv),
        SOC_DOUBLE_TLV("Headphone Crosstalk Volume", NAU8825_REG_DAC_DGAIN_CTRL,
                0, 8, 0xff, 0, crosstalk_vol_tlv),

        SOC_ENUM("ADC Decimation Rate", nau8825_adc_decimation_enum),
        SOC_ENUM("DAC Oversampling Rate", nau8825_dac_oversampl_enum),
        /* programmable biquad filter */
        SOC_ENUM("BIQ Path Select", nau8825_biq_path_enum),
        SND_SOC_BYTES_EXT("BIQ Coefficients", 20,
                  nau8825_biq_coeff_get, nau8825_biq_coeff_put),
};

/* DAC Mux 0x33[9] and 0x34[9] */
static const char * const nau8825_dac_src[] = {
        "DACL", "DACR",
};

static SOC_ENUM_SINGLE_DECL(
        nau8825_dacl_enum, NAU8825_REG_DACL_CTRL,
        NAU8825_DACL_CH_SEL_SFT, nau8825_dac_src);

static SOC_ENUM_SINGLE_DECL(
        nau8825_dacr_enum, NAU8825_REG_DACR_CTRL,
        NAU8825_DACR_CH_SEL_SFT, nau8825_dac_src);

static const struct snd_kcontrol_new nau8825_dacl_mux =
        SOC_DAPM_ENUM("DACL Source", nau8825_dacl_enum);

static const struct snd_kcontrol_new nau8825_dacr_mux =
        SOC_DAPM_ENUM("DACR Source", nau8825_dacr_enum);


static const struct snd_soc_dapm_widget nau8825_dapm_widgets[] = {
        SND_SOC_DAPM_AIF_OUT("AIFTX", "Capture", 0, NAU8825_REG_I2S_PCM_CTRL2,
                15, 1),

        SND_SOC_DAPM_INPUT("MIC"),
        SND_SOC_DAPM_MICBIAS("MICBIAS", NAU8825_REG_MIC_BIAS, 8, 0),

        SND_SOC_DAPM_PGA("Frontend PGA", NAU8825_REG_POWER_UP_CONTROL, 14, 0,
                NULL, 0),

        SND_SOC_DAPM_ADC_E("ADC", NULL, SND_SOC_NOPM, 0, 0,
                nau8825_adc_event, SND_SOC_DAPM_POST_PMU |
                SND_SOC_DAPM_POST_PMD),
        SND_SOC_DAPM_SUPPLY("ADC Clock", NAU8825_REG_ENA_CTRL, 7, 0, NULL, 0),
        SND_SOC_DAPM_SUPPLY("ADC Power", NAU8825_REG_ANALOG_ADC_2, 6, 0, NULL,
                0),

        /* ADC for button press detection. A dapm supply widget is used to
         * prevent dapm_power_widgets keeping the codec at SND_SOC_BIAS_ON
         * during suspend.
         */
        SND_SOC_DAPM_SUPPLY("SAR", NAU8825_REG_SAR_CTRL,
                NAU8825_SAR_ADC_EN_SFT, 0, NULL, 0),

        SND_SOC_DAPM_PGA_S("ADACL", 2, NAU8825_REG_RDAC, 12, 0, NULL, 0),
        SND_SOC_DAPM_PGA_S("ADACR", 2, NAU8825_REG_RDAC, 13, 0, NULL, 0),
        SND_SOC_DAPM_PGA_S("ADACL Clock", 3, NAU8825_REG_RDAC, 8, 0, NULL, 0),
        SND_SOC_DAPM_PGA_S("ADACR Clock", 3, NAU8825_REG_RDAC, 9, 0, NULL, 0),

        SND_SOC_DAPM_DAC("DDACR", NULL, NAU8825_REG_ENA_CTRL,
                NAU8825_ENABLE_DACR_SFT, 0),
        SND_SOC_DAPM_DAC("DDACL", NULL, NAU8825_REG_ENA_CTRL,
                NAU8825_ENABLE_DACL_SFT, 0),
        SND_SOC_DAPM_SUPPLY("DDAC Clock", NAU8825_REG_ENA_CTRL, 6, 0, NULL, 0),

        SND_SOC_DAPM_MUX("DACL Mux", SND_SOC_NOPM, 0, 0, &nau8825_dacl_mux),
        SND_SOC_DAPM_MUX("DACR Mux", SND_SOC_NOPM, 0, 0, &nau8825_dacr_mux),

        SND_SOC_DAPM_PGA_S("HP amp L", 0,
                NAU8825_REG_CLASSG_CTRL, 1, 0, NULL, 0),
        SND_SOC_DAPM_PGA_S("HP amp R", 0,
                NAU8825_REG_CLASSG_CTRL, 2, 0, NULL, 0),

        SND_SOC_DAPM_PGA_S("Charge Pump", 1, NAU8825_REG_CHARGE_PUMP, 5, 0,
                nau8825_pump_event, SND_SOC_DAPM_POST_PMU |
                SND_SOC_DAPM_PRE_PMD),

        SND_SOC_DAPM_PGA_S("Output Driver R Stage 1", 4,
                NAU8825_REG_POWER_UP_CONTROL, 5, 0, NULL, 0),
        SND_SOC_DAPM_PGA_S("Output Driver L Stage 1", 4,
                NAU8825_REG_POWER_UP_CONTROL, 4, 0, NULL, 0),
        SND_SOC_DAPM_PGA_S("Output Driver R Stage 2", 5,
                NAU8825_REG_POWER_UP_CONTROL, 3, 0, NULL, 0),
        SND_SOC_DAPM_PGA_S("Output Driver L Stage 2", 5,
                NAU8825_REG_POWER_UP_CONTROL, 2, 0, NULL, 0),
        SND_SOC_DAPM_PGA_S("Output Driver R Stage 3", 6,
                NAU8825_REG_POWER_UP_CONTROL, 1, 0, NULL, 0),
        SND_SOC_DAPM_PGA_S("Output Driver L Stage 3", 6,
                NAU8825_REG_POWER_UP_CONTROL, 0, 0, NULL, 0),

        SND_SOC_DAPM_PGA_S("Output DACL", 7,
                NAU8825_REG_CHARGE_PUMP, 8, 1, nau8825_output_dac_event,
                SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD),
        SND_SOC_DAPM_PGA_S("Output DACR", 7,
                NAU8825_REG_CHARGE_PUMP, 9, 1, nau8825_output_dac_event,
                SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD),

        /* HPOL/R are ungrounded by disabling 16 Ohm pull-downs on playback */
        SND_SOC_DAPM_PGA_S("HPOL Pulldown", 8,
                NAU8825_REG_HSD_CTRL, 0, 1, NULL, 0),
        SND_SOC_DAPM_PGA_S("HPOR Pulldown", 8,
                NAU8825_REG_HSD_CTRL, 1, 1, NULL, 0),

        /* High current HPOL/R boost driver */
        SND_SOC_DAPM_PGA_S("HP Boost Driver", 9,
                NAU8825_REG_BOOST, 9, 1, NULL, 0),

        /* Class G operation control*/
        SND_SOC_DAPM_PGA_S("Class G", 10,
                NAU8825_REG_CLASSG_CTRL, 0, 0, NULL, 0),

        SND_SOC_DAPM_OUTPUT("HPOL"),
        SND_SOC_DAPM_OUTPUT("HPOR"),
};

static const struct snd_soc_dapm_route nau8825_dapm_routes[] = {
        {"Frontend PGA", NULL, "MIC"},
        {"ADC", NULL, "Frontend PGA"},
        {"ADC", NULL, "ADC Clock"},
        {"ADC", NULL, "ADC Power"},
        {"AIFTX", NULL, "ADC"},

        {"DDACL", NULL, "Playback"},
        {"DDACR", NULL, "Playback"},
        {"DDACL", NULL, "DDAC Clock"},
        {"DDACR", NULL, "DDAC Clock"},
        {"DACL Mux", "DACL", "DDACL"},
        {"DACL Mux", "DACR", "DDACR"},
        {"DACR Mux", "DACL", "DDACL"},
        {"DACR Mux", "DACR", "DDACR"},
        {"HP amp L", NULL, "DACL Mux"},
        {"HP amp R", NULL, "DACR Mux"},
        {"Charge Pump", NULL, "HP amp L"},
        {"Charge Pump", NULL, "HP amp R"},
        {"ADACL", NULL, "Charge Pump"},
        {"ADACR", NULL, "Charge Pump"},
        {"ADACL Clock", NULL, "ADACL"},
        {"ADACR Clock", NULL, "ADACR"},
        {"Output Driver L Stage 1", NULL, "ADACL Clock"},
        {"Output Driver R Stage 1", NULL, "ADACR Clock"},
        {"Output Driver L Stage 2", NULL, "Output Driver L Stage 1"},
        {"Output Driver R Stage 2", NULL, "Output Driver R Stage 1"},
        {"Output Driver L Stage 3", NULL, "Output Driver L Stage 2"},
        {"Output Driver R Stage 3", NULL, "Output Driver R Stage 2"},
        {"Output DACL", NULL, "Output Driver L Stage 3"},
        {"Output DACR", NULL, "Output Driver R Stage 3"},
        {"HPOL Pulldown", NULL, "Output DACL"},
        {"HPOR Pulldown", NULL, "Output DACR"},
        {"HP Boost Driver", NULL, "HPOL Pulldown"},
        {"HP Boost Driver", NULL, "HPOR Pulldown"},
        {"Class G", NULL, "HP Boost Driver"},
        {"HPOL", NULL, "Class G"},
        {"HPOR", NULL, "Class G"},
};

static int nau8825_clock_check(struct nau8825 *nau8825,
        int stream, int rate, int osr)
{
        int osrate;

        if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
                if (osr >= ARRAY_SIZE(osr_dac_sel))
                        return -EINVAL;
                osrate = osr_dac_sel[osr].osr;
        } else {
                if (osr >= ARRAY_SIZE(osr_adc_sel))
                        return -EINVAL;
                osrate = osr_adc_sel[osr].osr;
        }

        if (!osrate || rate * osr > CLK_DA_AD_MAX) {
                dev_err(nau8825->dev, "exceed the maximum frequency of CLK_ADC or CLK_DAC\n");
                return -EINVAL;
        }

        return 0;
}

static int nau8825_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 nau8825 *nau8825 = snd_soc_component_get_drvdata(component);
        unsigned int val_len = 0, osr, ctrl_val, bclk_fs, bclk_div;

        nau8825_sema_acquire(nau8825, 3 * HZ);

        /* CLK_DAC or CLK_ADC = OSR * FS
         * DAC or ADC clock frequency is defined as Over Sampling Rate (OSR)
         * multiplied by the audio sample rate (Fs). Note that the OSR and Fs
         * values must be selected such that the maximum frequency is less
         * than 6.144 MHz.
         */
        if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
                regmap_read(nau8825->regmap, NAU8825_REG_DAC_CTRL1, &osr);
                osr &= NAU8825_DAC_OVERSAMPLE_MASK;
                if (nau8825_clock_check(nau8825, substream->stream,
                        params_rate(params), osr)) {
                        nau8825_sema_release(nau8825);
                        return -EINVAL;
                }
                regmap_update_bits(nau8825->regmap, NAU8825_REG_CLK_DIVIDER,
                        NAU8825_CLK_DAC_SRC_MASK,
                        osr_dac_sel[osr].clk_src << NAU8825_CLK_DAC_SRC_SFT);
        } else {
                regmap_read(nau8825->regmap, NAU8825_REG_ADC_RATE, &osr);
                osr &= NAU8825_ADC_SYNC_DOWN_MASK;
                if (nau8825_clock_check(nau8825, substream->stream,
                        params_rate(params), osr)) {
                        nau8825_sema_release(nau8825);
                        return -EINVAL;
                }
                regmap_update_bits(nau8825->regmap, NAU8825_REG_CLK_DIVIDER,
                        NAU8825_CLK_ADC_SRC_MASK,
                        osr_adc_sel[osr].clk_src << NAU8825_CLK_ADC_SRC_SFT);
        }

        /* make BCLK and LRC divde configuration if the codec as master. */
        regmap_read(nau8825->regmap, NAU8825_REG_I2S_PCM_CTRL2, &ctrl_val);
        if (ctrl_val & NAU8825_I2S_MS_MASTER) {
                /* get the bclk and fs ratio */
                bclk_fs = snd_soc_params_to_bclk(params) / params_rate(params);
                if (bclk_fs <= 32)
                        bclk_div = 2;
                else if (bclk_fs <= 64)
                        bclk_div = 1;
                else if (bclk_fs <= 128)
                        bclk_div = 0;
                else {
                        nau8825_sema_release(nau8825);
                        return -EINVAL;
                }
                regmap_update_bits(nau8825->regmap, NAU8825_REG_I2S_PCM_CTRL2,
                        NAU8825_I2S_LRC_DIV_MASK | NAU8825_I2S_BLK_DIV_MASK,
                        ((bclk_div + 1) << NAU8825_I2S_LRC_DIV_SFT) | bclk_div);
        }

        switch (params_width(params)) {
        case 16:
                val_len |= NAU8825_I2S_DL_16;
                break;
        case 20:
                val_len |= NAU8825_I2S_DL_20;
                break;
        case 24:
                val_len |= NAU8825_I2S_DL_24;
                break;
        case 32:
                val_len |= NAU8825_I2S_DL_32;
                break;
        default:
                nau8825_sema_release(nau8825);
                return -EINVAL;
        }

        regmap_update_bits(nau8825->regmap, NAU8825_REG_I2S_PCM_CTRL1,
                NAU8825_I2S_DL_MASK, val_len);

        /* Release the semaphore. */
        nau8825_sema_release(nau8825);

        return 0;
}

static int nau8825_set_dai_fmt(struct snd_soc_dai *codec_dai, unsigned int fmt)
{
        struct snd_soc_component *component = codec_dai->component;
        struct nau8825 *nau8825 = snd_soc_component_get_drvdata(component);
        unsigned int ctrl1_val = 0, ctrl2_val = 0;

        switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
        case SND_SOC_DAIFMT_CBM_CFM:
                ctrl2_val |= NAU8825_I2S_MS_MASTER;
                break;
        case SND_SOC_DAIFMT_CBS_CFS:
                break;
        default:
                return -EINVAL;
        }

        switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
        case SND_SOC_DAIFMT_NB_NF:
                break;
        case SND_SOC_DAIFMT_IB_NF:
                ctrl1_val |= NAU8825_I2S_BP_INV;
                break;
        default:
                return -EINVAL;
        }

        switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
        case SND_SOC_DAIFMT_I2S:
                ctrl1_val |= NAU8825_I2S_DF_I2S;
                break;
        case SND_SOC_DAIFMT_LEFT_J:
                ctrl1_val |= NAU8825_I2S_DF_LEFT;
                break;
        case SND_SOC_DAIFMT_RIGHT_J:
                ctrl1_val |= NAU8825_I2S_DF_RIGTH;
                break;
        case SND_SOC_DAIFMT_DSP_A:
                ctrl1_val |= NAU8825_I2S_DF_PCM_AB;
                break;
        case SND_SOC_DAIFMT_DSP_B:
                ctrl1_val |= NAU8825_I2S_DF_PCM_AB;
                ctrl1_val |= NAU8825_I2S_PCMB_EN;
                break;
        default:
                return -EINVAL;
        }

        nau8825_sema_acquire(nau8825, 3 * HZ);

        regmap_update_bits(nau8825->regmap, NAU8825_REG_I2S_PCM_CTRL1,
                NAU8825_I2S_DL_MASK | NAU8825_I2S_DF_MASK |
                NAU8825_I2S_BP_MASK | NAU8825_I2S_PCMB_MASK,
                ctrl1_val);
        regmap_update_bits(nau8825->regmap, NAU8825_REG_I2S_PCM_CTRL2,
                NAU8825_I2S_MS_MASK, ctrl2_val);

        /* Release the semaphore. */
        nau8825_sema_release(nau8825);

        return 0;
}

static const struct snd_soc_dai_ops nau8825_dai_ops = {
        .hw_params      = nau8825_hw_params,
        .set_fmt        = nau8825_set_dai_fmt,
};

#define NAU8825_RATES   SNDRV_PCM_RATE_8000_192000
#define NAU8825_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE \
                         | SNDRV_PCM_FMTBIT_S24_3LE | SNDRV_PCM_FMTBIT_S32_LE)

static struct snd_soc_dai_driver nau8825_dai = {
        .name = "nau8825-hifi",
        .playback = {
                .stream_name     = "Playback",
                .channels_min    = 1,
                .channels_max    = 2,
                .rates           = NAU8825_RATES,
                .formats         = NAU8825_FORMATS,
        },
        .capture = {
                .stream_name     = "Capture",
                .channels_min    = 1,
                .channels_max    = 1,
                .rates           = NAU8825_RATES,
                .formats         = NAU8825_FORMATS,
        },
        .ops = &nau8825_dai_ops,
};

/**
 * nau8825_enable_jack_detect - Specify a jack for event reporting
 *
 * @component:  component to register the jack with
 * @jack: jack to use to report headset and button events on
 *
 * After this function has been called the headset insert/remove and button
 * events will be routed to the given jack.  Jack can be null to stop
 * reporting.
 */
int nau8825_enable_jack_detect(struct snd_soc_component *component,
                                struct snd_soc_jack *jack)
{
        struct nau8825 *nau8825 = snd_soc_component_get_drvdata(component);
        struct regmap *regmap = nau8825->regmap;

        nau8825->jack = jack;

        /* Ground HP Outputs[1:0], needed for headset auto detection
         * Enable Automatic Mic/Gnd switching reading on insert interrupt[6]
         */
        regmap_update_bits(regmap, NAU8825_REG_HSD_CTRL,
                NAU8825_HSD_AUTO_MODE | NAU8825_SPKR_DWN1R | NAU8825_SPKR_DWN1L,
                NAU8825_HSD_AUTO_MODE | NAU8825_SPKR_DWN1R | NAU8825_SPKR_DWN1L);

        return 0;
}
EXPORT_SYMBOL_GPL(nau8825_enable_jack_detect);


static bool nau8825_is_jack_inserted(struct regmap *regmap)
{
        bool active_high, is_high;
        int status, jkdet;

        regmap_read(regmap, NAU8825_REG_JACK_DET_CTRL, &jkdet);
        active_high = jkdet & NAU8825_JACK_POLARITY;
        regmap_read(regmap, NAU8825_REG_I2C_DEVICE_ID, &status);
        is_high = status & NAU8825_GPIO2JD1;
        /* return jack connection status according to jack insertion logic
         * active high or active low.
         */
        return active_high == is_high;
}

static void nau8825_restart_jack_detection(struct regmap *regmap)
{
        /* this will restart the entire jack detection process including MIC/GND
         * switching and create interrupts. We have to go from 0 to 1 and back
         * to 0 to restart.
         */
        regmap_update_bits(regmap, NAU8825_REG_JACK_DET_CTRL,
                NAU8825_JACK_DET_RESTART, NAU8825_JACK_DET_RESTART);
        regmap_update_bits(regmap, NAU8825_REG_JACK_DET_CTRL,
                NAU8825_JACK_DET_RESTART, 0);
}

static void nau8825_int_status_clear_all(struct regmap *regmap)
{
        int active_irq, clear_irq, i;

        /* Reset the intrruption status from rightmost bit if the corres-
         * ponding irq event occurs.
         */
        regmap_read(regmap, NAU8825_REG_IRQ_STATUS, &active_irq);
        for (i = 0; i < NAU8825_REG_DATA_LEN; i++) {
                clear_irq = (0x1 << i);
                if (active_irq & clear_irq)
                        regmap_write(regmap,
                                NAU8825_REG_INT_CLR_KEY_STATUS, clear_irq);
        }
}

static void nau8825_eject_jack(struct nau8825 *nau8825)
{
        struct snd_soc_dapm_context *dapm = nau8825->dapm;
        struct regmap *regmap = nau8825->regmap;

        /* Force to cancel the cross talk detection process */
        nau8825_xtalk_cancel(nau8825);

        snd_soc_dapm_disable_pin(dapm, "SAR");
        snd_soc_dapm_disable_pin(dapm, "MICBIAS");
        /* Detach 2kOhm Resistors from MICBIAS to MICGND1/2 */
        regmap_update_bits(regmap, NAU8825_REG_MIC_BIAS,
                NAU8825_MICBIAS_JKSLV | NAU8825_MICBIAS_JKR2, 0);
        /* ground HPL/HPR, MICGRND1/2 */
        regmap_update_bits(regmap, NAU8825_REG_HSD_CTRL, 0xf, 0xf);

        snd_soc_dapm_sync(dapm);

        /* Clear all interruption status */
        nau8825_int_status_clear_all(regmap);

        /* Enable the insertion interruption, disable the ejection inter-
         * ruption, and then bypass de-bounce circuit.
         */
        regmap_update_bits(regmap, NAU8825_REG_INTERRUPT_DIS_CTRL,
                NAU8825_IRQ_EJECT_DIS | NAU8825_IRQ_INSERT_DIS,
                NAU8825_IRQ_EJECT_DIS);
        regmap_update_bits(regmap, NAU8825_REG_INTERRUPT_MASK,
                NAU8825_IRQ_OUTPUT_EN | NAU8825_IRQ_EJECT_EN |
                NAU8825_IRQ_HEADSET_COMPLETE_EN | NAU8825_IRQ_INSERT_EN,
                NAU8825_IRQ_OUTPUT_EN | NAU8825_IRQ_EJECT_EN |
                NAU8825_IRQ_HEADSET_COMPLETE_EN);
        regmap_update_bits(regmap, NAU8825_REG_JACK_DET_CTRL,
                NAU8825_JACK_DET_DB_BYPASS, NAU8825_JACK_DET_DB_BYPASS);

        /* Disable ADC needed for interruptions at audo mode */
        regmap_update_bits(regmap, NAU8825_REG_ENA_CTRL,
                NAU8825_ENABLE_ADC, 0);

        /* Close clock for jack type detection at manual mode */
        nau8825_configure_sysclk(nau8825, NAU8825_CLK_DIS, 0);
}

/* Enable audo mode interruptions with internal clock. */
static void nau8825_setup_auto_irq(struct nau8825 *nau8825)
{
        struct regmap *regmap = nau8825->regmap;

        /* Enable headset jack type detection complete interruption and
         * jack ejection interruption.
         */
        regmap_update_bits(regmap, NAU8825_REG_INTERRUPT_MASK,
                NAU8825_IRQ_HEADSET_COMPLETE_EN | NAU8825_IRQ_EJECT_EN, 0);

        /* Enable internal VCO needed for interruptions */
        nau8825_configure_sysclk(nau8825, NAU8825_CLK_INTERNAL, 0);

        /* Enable ADC needed for interruptions */
        regmap_update_bits(regmap, NAU8825_REG_ENA_CTRL,
                NAU8825_ENABLE_ADC, NAU8825_ENABLE_ADC);

        /* Chip needs one FSCLK cycle in order to generate interruptions,
         * as we cannot guarantee one will be provided by the system. Turning
         * master mode on then off enables us to generate that FSCLK cycle
         * with a minimum of contention on the clock bus.
         */
        regmap_update_bits(regmap, NAU8825_REG_I2S_PCM_CTRL2,
                NAU8825_I2S_MS_MASK, NAU8825_I2S_MS_MASTER);
        regmap_update_bits(regmap, NAU8825_REG_I2S_PCM_CTRL2,
                NAU8825_I2S_MS_MASK, NAU8825_I2S_MS_SLAVE);

        /* Not bypass de-bounce circuit */
        regmap_update_bits(regmap, NAU8825_REG_JACK_DET_CTRL,
                NAU8825_JACK_DET_DB_BYPASS, 0);

        /* Unmask all interruptions */
        regmap_write(regmap, NAU8825_REG_INTERRUPT_DIS_CTRL, 0);

        /* Restart the jack detection process at auto mode */
        nau8825_restart_jack_detection(regmap);
}

static int nau8825_button_decode(int value)
{
        int buttons = 0;

        /* The chip supports up to 8 buttons, but ALSA defines only 6 buttons */
        if (value & BIT(0))
                buttons |= SND_JACK_BTN_0;
        if (value & BIT(1))
                buttons |= SND_JACK_BTN_1;
        if (value & BIT(2))
                buttons |= SND_JACK_BTN_2;
        if (value & BIT(3))
                buttons |= SND_JACK_BTN_3;
        if (value & BIT(4))
                buttons |= SND_JACK_BTN_4;
        if (value & BIT(5))
                buttons |= SND_JACK_BTN_5;

        return buttons;
}

static int nau8825_jack_insert(struct nau8825 *nau8825)
{
        struct regmap *regmap = nau8825->regmap;
        struct snd_soc_dapm_context *dapm = nau8825->dapm;
        int jack_status_reg, mic_detected;
        int type = 0;

        regmap_read(regmap, NAU8825_REG_GENERAL_STATUS, &jack_status_reg);
        mic_detected = (jack_status_reg >> 10) & 3;
        /* The JKSLV and JKR2 all detected in high impedance headset */
        if (mic_detected == 0x3)
                nau8825->high_imped = true;
        else
                nau8825->high_imped = false;

        switch (mic_detected) {
        case 0:
                /* no mic */
                type = SND_JACK_HEADPHONE;
                break;
        case 1:
                dev_dbg(nau8825->dev, "OMTP (micgnd1) mic connected\n");
                type = SND_JACK_HEADSET;

                /* Unground MICGND1 */
                regmap_update_bits(regmap, NAU8825_REG_HSD_CTRL, 3 << 2,
                        1 << 2);
                /* Attach 2kOhm Resistor from MICBIAS to MICGND1 */
                regmap_update_bits(regmap, NAU8825_REG_MIC_BIAS,
                        NAU8825_MICBIAS_JKSLV | NAU8825_MICBIAS_JKR2,
                        NAU8825_MICBIAS_JKR2);
                /* Attach SARADC to MICGND1 */
                regmap_update_bits(regmap, NAU8825_REG_SAR_CTRL,
                        NAU8825_SAR_INPUT_MASK,
                        NAU8825_SAR_INPUT_JKR2);

                snd_soc_dapm_force_enable_pin(dapm, "MICBIAS");
                snd_soc_dapm_force_enable_pin(dapm, "SAR");
                snd_soc_dapm_sync(dapm);
                break;
        case 2:
                dev_dbg(nau8825->dev, "CTIA (micgnd2) mic connected\n");
                type = SND_JACK_HEADSET;

                /* Unground MICGND2 */
                regmap_update_bits(regmap, NAU8825_REG_HSD_CTRL, 3 << 2,
                        2 << 2);
                /* Attach 2kOhm Resistor from MICBIAS to MICGND2 */
                regmap_update_bits(regmap, NAU8825_REG_MIC_BIAS,
                        NAU8825_MICBIAS_JKSLV | NAU8825_MICBIAS_JKR2,
                        NAU8825_MICBIAS_JKSLV);
                /* Attach SARADC to MICGND2 */
                regmap_update_bits(regmap, NAU8825_REG_SAR_CTRL,
                        NAU8825_SAR_INPUT_MASK,
                        NAU8825_SAR_INPUT_JKSLV);

                snd_soc_dapm_force_enable_pin(dapm, "MICBIAS");
                snd_soc_dapm_force_enable_pin(dapm, "SAR");
                snd_soc_dapm_sync(dapm);
                break;
        case 3:
                /* detect error case */
                dev_err(nau8825->dev, "detection error; disable mic function\n");
                type = SND_JACK_HEADPHONE;
                break;
        }

        /* Leaving HPOL/R grounded after jack insert by default. They will be
         * ungrounded as part of the widget power up sequence at the beginning
         * of playback to reduce pop.
         */
        return type;
}

#define NAU8825_BUTTONS (SND_JACK_BTN_0 | SND_JACK_BTN_1 | \
                SND_JACK_BTN_2 | SND_JACK_BTN_3)

static irqreturn_t nau8825_interrupt(int irq, void *data)
{
        struct nau8825 *nau8825 = (struct nau8825 *)data;
        struct regmap *regmap = nau8825->regmap;
        int active_irq, clear_irq = 0, event = 0, event_mask = 0;

        if (regmap_read(regmap, NAU8825_REG_IRQ_STATUS, &active_irq)) {
                dev_err(nau8825->dev, "failed to read irq status\n");
                return IRQ_NONE;
        }

        if ((active_irq & NAU8825_JACK_EJECTION_IRQ_MASK) ==
                NAU8825_JACK_EJECTION_DETECTED) {

                nau8825_eject_jack(nau8825);
                event_mask |= SND_JACK_HEADSET;
                clear_irq = NAU8825_JACK_EJECTION_IRQ_MASK;
        } else if (active_irq & NAU8825_KEY_SHORT_PRESS_IRQ) {
                int key_status;

                regmap_read(regmap, NAU8825_REG_INT_CLR_KEY_STATUS,
                        &key_status);

                /* upper 8 bits of the register are for short pressed keys,
                 * lower 8 bits - for long pressed buttons
                 */
                nau8825->button_pressed = nau8825_button_decode(
                        key_status >> 8);

                event |= nau8825->button_pressed;
                event_mask |= NAU8825_BUTTONS;
                clear_irq = NAU8825_KEY_SHORT_PRESS_IRQ;
        } else if (active_irq & NAU8825_KEY_RELEASE_IRQ) {
                event_mask = NAU8825_BUTTONS;
                clear_irq = NAU8825_KEY_RELEASE_IRQ;
        } else if (active_irq & NAU8825_HEADSET_COMPLETION_IRQ) {
                if (nau8825_is_jack_inserted(regmap)) {
                        event |= nau8825_jack_insert(nau8825);
                        if (nau8825->xtalk_enable && !nau8825->high_imped) {
                                /* Apply the cross talk suppression in the
                                 * headset without high impedance.
                                 */
                                if (!nau8825->xtalk_protect) {
                                        /* Raise protection for cross talk de-
                                         * tection if no protection before.
                                         * The driver has to cancel the pro-
                                         * cess and restore changes if process
                                         * is ongoing when ejection.
                                         */
                                        int ret;
                                        nau8825->xtalk_protect = true;
                                        ret = nau8825_sema_acquire(nau8825, 0);
                                        if (ret)
                                                nau8825->xtalk_protect = false;
                                }
                                /* Startup cross talk detection process */
                                if (nau8825->xtalk_protect) {
                                        nau8825->xtalk_state =
                                                NAU8825_XTALK_PREPARE;
                                        schedule_work(&nau8825->xtalk_work);
                                }
                        } else {
                                /* The cross talk suppression shouldn't apply
                                 * in the headset with high impedance. Thus,
                                 * relieve the protection raised before.
                                 */
                                if (nau8825->xtalk_protect) {
                                        nau8825_sema_release(nau8825);
                                        nau8825->xtalk_protect = false;
                                }
                        }
                } else {
                        dev_warn(nau8825->dev, "Headset completion IRQ fired but no headset connected\n");
                        nau8825_eject_jack(nau8825);
                }

                event_mask |= SND_JACK_HEADSET;
                clear_irq = NAU8825_HEADSET_COMPLETION_IRQ;
                /* Record the interruption report event for driver to report
                 * the event later. The jack report will delay until cross
                 * talk detection process is done.
                 */
                if (nau8825->xtalk_state == NAU8825_XTALK_PREPARE) {
                        nau8825->xtalk_event = event;
                        nau8825->xtalk_event_mask = event_mask;
                }
        } else if (active_irq & NAU8825_IMPEDANCE_MEAS_IRQ) {
                /* crosstalk detection enable and process on going */
                if (nau8825->xtalk_enable && nau8825->xtalk_protect)
                        schedule_work(&nau8825->xtalk_work);
                clear_irq = NAU8825_IMPEDANCE_MEAS_IRQ;
        } else if ((active_irq & NAU8825_JACK_INSERTION_IRQ_MASK) ==
                NAU8825_JACK_INSERTION_DETECTED) {
                /* One more step to check GPIO status directly. Thus, the
                 * driver can confirm the real insertion interruption because
                 * the intrruption at manual mode has bypassed debounce
                 * circuit which can get rid of unstable status.
                 */
                if (nau8825_is_jack_inserted(regmap)) {
                        /* Turn off insertion interruption at manual mode */
                        regmap_update_bits(regmap,
                                NAU8825_REG_INTERRUPT_DIS_CTRL,
                                NAU8825_IRQ_INSERT_DIS,
                                NAU8825_IRQ_INSERT_DIS);
                        regmap_update_bits(regmap, NAU8825_REG_INTERRUPT_MASK,
                                NAU8825_IRQ_INSERT_EN, NAU8825_IRQ_INSERT_EN);
                        /* Enable interruption for jack type detection at audo
                         * mode which can detect microphone and jack type.
                         */
                        nau8825_setup_auto_irq(nau8825);
                }
        }

        if (!clear_irq)
                clear_irq = active_irq;
        /* clears the rightmost interruption */
        regmap_write(regmap, NAU8825_REG_INT_CLR_KEY_STATUS, clear_irq);

        /* Delay jack report until cross talk detection is done. It can avoid
         * application to do playback preparation when cross talk detection
         * process is still working. Otherwise, the resource like clock and
         * power will be issued by them at the same time and conflict happens.
         */
        if (event_mask && nau8825->xtalk_state == NAU8825_XTALK_DONE)
                snd_soc_jack_report(nau8825->jack, event, event_mask);

        return IRQ_HANDLED;
}

static void nau8825_setup_buttons(struct nau8825 *nau8825)
{
        struct regmap *regmap = nau8825->regmap;

        regmap_update_bits(regmap, NAU8825_REG_SAR_CTRL,
                NAU8825_SAR_TRACKING_GAIN_MASK,
                nau8825->sar_voltage << NAU8825_SAR_TRACKING_GAIN_SFT);
        regmap_update_bits(regmap, NAU8825_REG_SAR_CTRL,
                NAU8825_SAR_COMPARE_TIME_MASK,
                nau8825->sar_compare_time << NAU8825_SAR_COMPARE_TIME_SFT);
        regmap_update_bits(regmap, NAU8825_REG_SAR_CTRL,
                NAU8825_SAR_SAMPLING_TIME_MASK,
                nau8825->sar_sampling_time << NAU8825_SAR_SAMPLING_TIME_SFT);

        regmap_update_bits(regmap, NAU8825_REG_KEYDET_CTRL,
                NAU8825_KEYDET_LEVELS_NR_MASK,
                (nau8825->sar_threshold_num - 1) << NAU8825_KEYDET_LEVELS_NR_SFT);
        regmap_update_bits(regmap, NAU8825_REG_KEYDET_CTRL,
                NAU8825_KEYDET_HYSTERESIS_MASK,
                nau8825->sar_hysteresis << NAU8825_KEYDET_HYSTERESIS_SFT);
        regmap_update_bits(regmap, NAU8825_REG_KEYDET_CTRL,
                NAU8825_KEYDET_SHORTKEY_DEBOUNCE_MASK,
                nau8825->key_debounce << NAU8825_KEYDET_SHORTKEY_DEBOUNCE_SFT);

        regmap_write(regmap, NAU8825_REG_VDET_THRESHOLD_1,
                (nau8825->sar_threshold[0] << 8) | nau8825->sar_threshold[1]);
        regmap_write(regmap, NAU8825_REG_VDET_THRESHOLD_2,
                (nau8825->sar_threshold[2] << 8) | nau8825->sar_threshold[3]);
        regmap_write(regmap, NAU8825_REG_VDET_THRESHOLD_3,
                (nau8825->sar_threshold[4] << 8) | nau8825->sar_threshold[5]);
        regmap_write(regmap, NAU8825_REG_VDET_THRESHOLD_4,
                (nau8825->sar_threshold[6] << 8) | nau8825->sar_threshold[7]);

        /* Enable short press and release interruptions */
        regmap_update_bits(regmap, NAU8825_REG_INTERRUPT_MASK,
                NAU8825_IRQ_KEY_SHORT_PRESS_EN | NAU8825_IRQ_KEY_RELEASE_EN,
                0);
}

static void nau8825_init_regs(struct nau8825 *nau8825)
{
        struct regmap *regmap = nau8825->regmap;

        /* Latch IIC LSB value */
        regmap_write(regmap, NAU8825_REG_IIC_ADDR_SET, 0x0001);
        /* Enable Bias/Vmid */
        regmap_update_bits(nau8825->regmap, NAU8825_REG_BIAS_ADJ,
                NAU8825_BIAS_VMID, NAU8825_BIAS_VMID);
        regmap_update_bits(nau8825->regmap, NAU8825_REG_BOOST,
                NAU8825_GLOBAL_BIAS_EN, NAU8825_GLOBAL_BIAS_EN);

        /* VMID Tieoff */
        regmap_update_bits(regmap, NAU8825_REG_BIAS_ADJ,
                NAU8825_BIAS_VMID_SEL_MASK,
                nau8825->vref_impedance << NAU8825_BIAS_VMID_SEL_SFT);
        /* Disable Boost Driver, Automatic Short circuit protection enable */
        regmap_update_bits(regmap, NAU8825_REG_BOOST,
                NAU8825_PRECHARGE_DIS | NAU8825_HP_BOOST_DIS |
                NAU8825_HP_BOOST_G_DIS | NAU8825_SHORT_SHUTDOWN_EN,
                NAU8825_PRECHARGE_DIS | NAU8825_HP_BOOST_DIS |
                NAU8825_HP_BOOST_G_DIS | NAU8825_SHORT_SHUTDOWN_EN);

        regmap_update_bits(regmap, NAU8825_REG_GPIO12_CTRL,
                NAU8825_JKDET_OUTPUT_EN,
                nau8825->jkdet_enable ? 0 : NAU8825_JKDET_OUTPUT_EN);
        regmap_update_bits(regmap, NAU8825_REG_GPIO12_CTRL,
                NAU8825_JKDET_PULL_EN,
                nau8825->jkdet_pull_enable ? 0 : NAU8825_JKDET_PULL_EN);
        regmap_update_bits(regmap, NAU8825_REG_GPIO12_CTRL,
                NAU8825_JKDET_PULL_UP,
                nau8825->jkdet_pull_up ? NAU8825_JKDET_PULL_UP : 0);
        regmap_update_bits(regmap, NAU8825_REG_JACK_DET_CTRL,
                NAU8825_JACK_POLARITY,
                /* jkdet_polarity - 1  is for active-low */
                nau8825->jkdet_polarity ? 0 : NAU8825_JACK_POLARITY);

        regmap_update_bits(regmap, NAU8825_REG_JACK_DET_CTRL,
                NAU8825_JACK_INSERT_DEBOUNCE_MASK,
                nau8825->jack_insert_debounce << NAU8825_JACK_INSERT_DEBOUNCE_SFT);
        regmap_update_bits(regmap, NAU8825_REG_JACK_DET_CTRL,
                NAU8825_JACK_EJECT_DEBOUNCE_MASK,
                nau8825->jack_eject_debounce << NAU8825_JACK_EJECT_DEBOUNCE_SFT);

        /* Mask unneeded IRQs: 1 - disable, 0 - enable */
        regmap_update_bits(regmap, NAU8825_REG_INTERRUPT_MASK, 0x7ff, 0x7ff);

        regmap_update_bits(regmap, NAU8825_REG_MIC_BIAS,
                NAU8825_MICBIAS_VOLTAGE_MASK, nau8825->micbias_voltage);

        if (nau8825->sar_threshold_num)
                nau8825_setup_buttons(nau8825);

        /* Default oversampling/decimations settings are unusable
         * (audible hiss). Set it to something better.
         */
        regmap_update_bits(regmap, NAU8825_REG_ADC_RATE,
                NAU8825_ADC_SYNC_DOWN_MASK | NAU8825_ADC_SINC4_EN,
                NAU8825_ADC_SYNC_DOWN_64);
        regmap_update_bits(regmap, NAU8825_REG_DAC_CTRL1,
                NAU8825_DAC_OVERSAMPLE_MASK, NAU8825_DAC_OVERSAMPLE_64);
        /* Disable DACR/L power */
        regmap_update_bits(regmap, NAU8825_REG_CHARGE_PUMP,
                NAU8825_POWER_DOWN_DACR | NAU8825_POWER_DOWN_DACL,
                NAU8825_POWER_DOWN_DACR | NAU8825_POWER_DOWN_DACL);
        /* Enable TESTDAC. This sets the analog DAC inputs to a '0' input
         * signal to avoid any glitches due to power up transients in both
         * the analog and digital DAC circuit.
         */
        regmap_update_bits(nau8825->regmap, NAU8825_REG_BIAS_ADJ,
                NAU8825_BIAS_TESTDAC_EN, NAU8825_BIAS_TESTDAC_EN);
        /* CICCLP off */
        regmap_update_bits(regmap, NAU8825_REG_DAC_CTRL1,
                NAU8825_DAC_CLIP_OFF, NAU8825_DAC_CLIP_OFF);

        /* Class AB bias current to 2x, DAC Capacitor enable MSB/LSB */
        regmap_update_bits(regmap, NAU8825_REG_ANALOG_CONTROL_2,
                NAU8825_HP_NON_CLASSG_CURRENT_2xADJ |
                NAU8825_DAC_CAPACITOR_MSB | NAU8825_DAC_CAPACITOR_LSB,
                NAU8825_HP_NON_CLASSG_CURRENT_2xADJ |
                NAU8825_DAC_CAPACITOR_MSB | NAU8825_DAC_CAPACITOR_LSB);
        /* Class G timer 64ms */
        regmap_update_bits(regmap, NAU8825_REG_CLASSG_CTRL,
                NAU8825_CLASSG_TIMER_MASK,
                0x20 << NAU8825_CLASSG_TIMER_SFT);
        /* DAC clock delay 2ns, VREF */
        regmap_update_bits(regmap, NAU8825_REG_RDAC,
                NAU8825_RDAC_CLK_DELAY_MASK | NAU8825_RDAC_VREF_MASK,
                (0x2 << NAU8825_RDAC_CLK_DELAY_SFT) |
                (0x3 << NAU8825_RDAC_VREF_SFT));
        /* Config L/R channel */
        regmap_update_bits(nau8825->regmap, NAU8825_REG_DACL_CTRL,
                NAU8825_DACL_CH_SEL_MASK, NAU8825_DACL_CH_SEL_L);
        regmap_update_bits(nau8825->regmap, NAU8825_REG_DACR_CTRL,
                NAU8825_DACL_CH_SEL_MASK, NAU8825_DACL_CH_SEL_R);
        /* Disable short Frame Sync detection logic */
        regmap_update_bits(regmap, NAU8825_REG_LEFT_TIME_SLOT,
                NAU8825_DIS_FS_SHORT_DET, NAU8825_DIS_FS_SHORT_DET);
}

static const struct regmap_config nau8825_regmap_config = {
        .val_bits = NAU8825_REG_DATA_LEN,
        .reg_bits = NAU8825_REG_ADDR_LEN,

        .max_register = NAU8825_REG_MAX,
        .readable_reg = nau8825_readable_reg,
        .writeable_reg = nau8825_writeable_reg,
        .volatile_reg = nau8825_volatile_reg,

        .cache_type = REGCACHE_RBTREE,
        .reg_defaults = nau8825_reg_defaults,
        .num_reg_defaults = ARRAY_SIZE(nau8825_reg_defaults),
};

static int nau8825_component_probe(struct snd_soc_component *component)
{
        struct nau8825 *nau8825 = snd_soc_component_get_drvdata(component);
        struct snd_soc_dapm_context *dapm = snd_soc_component_get_dapm(component);

        nau8825->dapm = dapm;

        return 0;
}

static void nau8825_component_remove(struct snd_soc_component *component)
{
        struct nau8825 *nau8825 = snd_soc_component_get_drvdata(component);

        /* Cancel and reset cross tak suppresstion detection funciton */
        nau8825_xtalk_cancel(nau8825);
}

/**
 * nau8825_calc_fll_param - Calculate FLL parameters.
 * @fll_in: external clock provided to codec.
 * @fs: sampling rate.
 * @fll_param: Pointer to structure of FLL parameters.
 *
 * Calculate FLL parameters to configure codec.
 *
 * Returns 0 for success or negative error code.
 */
static int nau8825_calc_fll_param(unsigned int fll_in, unsigned int fs,
                struct nau8825_fll *fll_param)
{
        u64 fvco, fvco_max;
        unsigned int fref, i, fvco_sel;

        /* Ensure the reference clock frequency (FREF) is <= 13.5MHz by dividing
         * freq_in by 1, 2, 4, or 8 using FLL pre-scalar.
         * FREF = freq_in / NAU8825_FLL_REF_DIV_MASK
         */
        for (i = 0; i < ARRAY_SIZE(fll_pre_scalar); i++) {
                fref = fll_in / fll_pre_scalar[i].param;
                if (fref <= NAU_FREF_MAX)
                        break;
        }
        if (i == ARRAY_SIZE(fll_pre_scalar))
                return -EINVAL;
        fll_param->clk_ref_div = fll_pre_scalar[i].val;

        /* Choose the FLL ratio based on FREF */
        for (i = 0; i < ARRAY_SIZE(fll_ratio); i++) {
                if (fref >= fll_ratio[i].param)
                        break;
        }
        if (i == ARRAY_SIZE(fll_ratio))
                return -EINVAL;
        fll_param->ratio = fll_ratio[i].val;

        /* Calculate the frequency of DCO (FDCO) given freq_out = 256 * Fs.
         * FDCO must be within the 90MHz - 124MHz or the FFL cannot be
         * guaranteed across the full range of operation.
         * FDCO = freq_out * 2 * mclk_src_scaling
         */
        fvco_max = 0;
        fvco_sel = ARRAY_SIZE(mclk_src_scaling);
        for (i = 0; i < ARRAY_SIZE(mclk_src_scaling); i++) {
                fvco = 256 * fs * 2 * mclk_src_scaling[i].param;
                if (fvco > NAU_FVCO_MIN && fvco < NAU_FVCO_MAX &&
                        fvco_max < fvco) {
                        fvco_max = fvco;
                        fvco_sel = i;
                }
        }
        if (ARRAY_SIZE(mclk_src_scaling) == fvco_sel)
                return -EINVAL;
        fll_param->mclk_src = mclk_src_scaling[fvco_sel].val;

        /* Calculate the FLL 10-bit integer input and the FLL 16-bit fractional
         * input based on FDCO, FREF and FLL ratio.
         */
        fvco = div_u64(fvco_max << 16, fref * fll_param->ratio);
        fll_param->fll_int = (fvco >> 16) & 0x3FF;
        fll_param->fll_frac = fvco & 0xFFFF;
        return 0;
}

static void nau8825_fll_apply(struct nau8825 *nau8825,
                struct nau8825_fll *fll_param)
{
        regmap_update_bits(nau8825->regmap, NAU8825_REG_CLK_DIVIDER,
                NAU8825_CLK_SRC_MASK | NAU8825_CLK_MCLK_SRC_MASK,
                NAU8825_CLK_SRC_MCLK | fll_param->mclk_src);
        /* Make DSP operate at high speed for better performance. */
        regmap_update_bits(nau8825->regmap, NAU8825_REG_FLL1,
                NAU8825_FLL_RATIO_MASK | NAU8825_ICTRL_LATCH_MASK,
                fll_param->ratio | (0x6 << NAU8825_ICTRL_LATCH_SFT));
        /* FLL 16-bit fractional input */
        regmap_write(nau8825->regmap, NAU8825_REG_FLL2, fll_param->fll_frac);
        /* FLL 10-bit integer input */
        regmap_update_bits(nau8825->regmap, NAU8825_REG_FLL3,
                        NAU8825_FLL_INTEGER_MASK, fll_param->fll_int);
        /* FLL pre-scaler */
        regmap_update_bits(nau8825->regmap, NAU8825_REG_FLL4,
                        NAU8825_FLL_REF_DIV_MASK,
                        fll_param->clk_ref_div << NAU8825_FLL_REF_DIV_SFT);
        /* select divided VCO input */
        regmap_update_bits(nau8825->regmap, NAU8825_REG_FLL5,
                NAU8825_FLL_CLK_SW_MASK, NAU8825_FLL_CLK_SW_REF);
        /* Disable free-running mode */
        regmap_update_bits(nau8825->regmap,
                NAU8825_REG_FLL6, NAU8825_DCO_EN, 0);
        if (fll_param->fll_frac) {
                /* set FLL loop filter enable and cutoff frequency at 500Khz */
                regmap_update_bits(nau8825->regmap, NAU8825_REG_FLL5,
                        NAU8825_FLL_PDB_DAC_EN | NAU8825_FLL_LOOP_FTR_EN |
                        NAU8825_FLL_FTR_SW_MASK,
                        NAU8825_FLL_PDB_DAC_EN | NAU8825_FLL_LOOP_FTR_EN |
                        NAU8825_FLL_FTR_SW_FILTER);
                regmap_update_bits(nau8825->regmap, NAU8825_REG_FLL6,
                        NAU8825_SDM_EN | NAU8825_CUTOFF500,
                        NAU8825_SDM_EN | NAU8825_CUTOFF500);
        } else {
                /* disable FLL loop filter and cutoff frequency */
                regmap_update_bits(nau8825->regmap, NAU8825_REG_FLL5,
                        NAU8825_FLL_PDB_DAC_EN | NAU8825_FLL_LOOP_FTR_EN |
                        NAU8825_FLL_FTR_SW_MASK, NAU8825_FLL_FTR_SW_ACCU);
                regmap_update_bits(nau8825->regmap, NAU8825_REG_FLL6,
                        NAU8825_SDM_EN | NAU8825_CUTOFF500, 0);
        }
}

/* freq_out must be 256*Fs in order to achieve the best performance */
static int nau8825_set_pll(struct snd_soc_component *component, int pll_id, int source,
                unsigned int freq_in, unsigned int freq_out)
{
        struct nau8825 *nau8825 = snd_soc_component_get_drvdata(component);
        struct nau8825_fll fll_param;
        int ret, fs;

        fs = freq_out / 256;
        ret = nau8825_calc_fll_param(freq_in, fs, &fll_param);
        if (ret < 0) {
                dev_err(component->dev, "Unsupported input clock %d\n", freq_in);
                return ret;
        }
        dev_dbg(component->dev, "mclk_src=%x ratio=%x fll_frac=%x fll_int=%x clk_ref_div=%x\n",
                fll_param.mclk_src, fll_param.ratio, fll_param.fll_frac,
                fll_param.fll_int, fll_param.clk_ref_div);

        nau8825_fll_apply(nau8825, &fll_param);
        mdelay(2);
        regmap_update_bits(nau8825->regmap, NAU8825_REG_CLK_DIVIDER,
                        NAU8825_CLK_SRC_MASK, NAU8825_CLK_SRC_VCO);
        return 0;
}

static int nau8825_mclk_prepare(struct nau8825 *nau8825, unsigned int freq)
{
        int ret = 0;

        nau8825->mclk = devm_clk_get(nau8825->dev, "mclk");
        if (IS_ERR(nau8825->mclk)) {
                dev_info(nau8825->dev, "No 'mclk' clock found, assume MCLK is managed externally");
                return 0;
        }

        if (!nau8825->mclk_freq) {
                ret = clk_prepare_enable(nau8825->mclk);
                if (ret) {
                        dev_err(nau8825->dev, "Unable to prepare codec mclk\n");
                        return ret;
                }
        }

        if (nau8825->mclk_freq != freq) {
                freq = clk_round_rate(nau8825->mclk, freq);
                ret = clk_set_rate(nau8825->mclk, freq);
                if (ret) {
                        dev_err(nau8825->dev, "Unable to set mclk rate\n");
                        return ret;
                }
                nau8825->mclk_freq = freq;
        }

        return 0;
}

static void nau8825_configure_mclk_as_sysclk(struct regmap *regmap)
{
        regmap_update_bits(regmap, NAU8825_REG_CLK_DIVIDER,
                NAU8825_CLK_SRC_MASK, NAU8825_CLK_SRC_MCLK);
        regmap_update_bits(regmap, NAU8825_REG_FLL6,
                NAU8825_DCO_EN, 0);
        /* Make DSP operate as default setting for power saving. */
        regmap_update_bits(regmap, NAU8825_REG_FLL1,
                NAU8825_ICTRL_LATCH_MASK, 0);
}

static int nau8825_configure_sysclk(struct nau8825 *nau8825, int clk_id,
        unsigned int freq)
{
        struct regmap *regmap = nau8825->regmap;
        int ret;

        switch (clk_id) {
        case NAU8825_CLK_DIS:
                /* Clock provided externally and disable internal VCO clock */
                nau8825_configure_mclk_as_sysclk(regmap);
                if (nau8825->mclk_freq) {
                        clk_disable_unprepare(nau8825->mclk);
                        nau8825->mclk_freq = 0;
                }

                break;
        case NAU8825_CLK_MCLK:
                /* Acquire the semaphore to synchronize the playback and
                 * interrupt handler. In order to avoid the playback inter-
                 * fered by cross talk process, the driver make the playback
                 * preparation halted until cross talk process finish.
                 */
                nau8825_sema_acquire(nau8825, 3 * HZ);
                nau8825_configure_mclk_as_sysclk(regmap);
                /* MCLK not changed by clock tree */
                regmap_update_bits(regmap, NAU8825_REG_CLK_DIVIDER,
                        NAU8825_CLK_MCLK_SRC_MASK, 0);
                /* Release the semaphore. */
                nau8825_sema_release(nau8825);

                ret = nau8825_mclk_prepare(nau8825, freq);
                if (ret)
                        return ret;

                break;
        case NAU8825_CLK_INTERNAL:
                if (nau8825_is_jack_inserted(nau8825->regmap)) {
                        regmap_update_bits(regmap, NAU8825_REG_FLL6,
                                NAU8825_DCO_EN, NAU8825_DCO_EN);
                        regmap_update_bits(regmap, NAU8825_REG_CLK_DIVIDER,
                                NAU8825_CLK_SRC_MASK, NAU8825_CLK_SRC_VCO);
                        /* Decrease the VCO frequency and make DSP operate
                         * as default setting for power saving.
                         */
                        regmap_update_bits(regmap, NAU8825_REG_CLK_DIVIDER,
                                NAU8825_CLK_MCLK_SRC_MASK, 0xf);
                        regmap_update_bits(regmap, NAU8825_REG_FLL1,
                                NAU8825_ICTRL_LATCH_MASK |
                                NAU8825_FLL_RATIO_MASK, 0x10);
                        regmap_update_bits(regmap, NAU8825_REG_FLL6,
                                NAU8825_SDM_EN, NAU8825_SDM_EN);
                } else {
                        /* The clock turns off intentionally for power saving
                         * when no headset connected.
                         */
                        nau8825_configure_mclk_as_sysclk(regmap);
                        dev_warn(nau8825->dev, "Disable clock for power saving when no headset connected\n");
                }
                if (nau8825->mclk_freq) {
                        clk_disable_unprepare(nau8825->mclk);
                        nau8825->mclk_freq = 0;
                }

                break;
        case NAU8825_CLK_FLL_MCLK:
                /* Acquire the semaphore to synchronize the playback and
                 * interrupt handler. In order to avoid the playback inter-
                 * fered by cross talk process, the driver make the playback
                 * preparation halted until cross talk process finish.
                 */
                nau8825_sema_acquire(nau8825, 3 * HZ);
                /* Higher FLL reference input frequency can only set lower
                 * gain error, such as 0000 for input reference from MCLK
                 * 12.288Mhz.
                 */
                regmap_update_bits(regmap, NAU8825_REG_FLL3,
                        NAU8825_FLL_CLK_SRC_MASK | NAU8825_GAIN_ERR_MASK,
                        NAU8825_FLL_CLK_SRC_MCLK | 0);
                /* Release the semaphore. */
                nau8825_sema_release(nau8825);

                ret = nau8825_mclk_prepare(nau8825, freq);
                if (ret)
                        return ret;

                break;
        case NAU8825_CLK_FLL_BLK:
                /* Acquire the semaphore to synchronize the playback and
                 * interrupt handler. In order to avoid the playback inter-
                 * fered by cross talk process, the driver make the playback
                 * preparation halted until cross talk process finish.
                 */
                nau8825_sema_acquire(nau8825, 3 * HZ);
                /* If FLL reference input is from low frequency source,
                 * higher error gain can apply such as 0xf which has
                 * the most sensitive gain error correction threshold,
                 * Therefore, FLL has the most accurate DCO to
                 * target frequency.
                 */
                regmap_update_bits(regmap, NAU8825_REG_FLL3,
                        NAU8825_FLL_CLK_SRC_MASK | NAU8825_GAIN_ERR_MASK,
                        NAU8825_FLL_CLK_SRC_BLK |
                        (0xf << NAU8825_GAIN_ERR_SFT));
                /* Release the semaphore. */
                nau8825_sema_release(nau8825);

                if (nau8825->mclk_freq) {
                        clk_disable_unprepare(nau8825->mclk);
                        nau8825->mclk_freq = 0;
                }

                break;
        case NAU8825_CLK_FLL_FS:
                /* Acquire the semaphore to synchronize the playback and
                 * interrupt handler. In order to avoid the playback inter-
                 * fered by cross talk process, the driver make the playback
                 * preparation halted until cross talk process finish.
                 */
                nau8825_sema_acquire(nau8825, 3 * HZ);
                /* If FLL reference input is from low frequency source,
                 * higher error gain can apply such as 0xf which has
                 * the most sensitive gain error correction threshold,
                 * Therefore, FLL has the most accurate DCO to
                 * target frequency.
                 */
                regmap_update_bits(regmap, NAU8825_REG_FLL3,
                        NAU8825_FLL_CLK_SRC_MASK | NAU8825_GAIN_ERR_MASK,
                        NAU8825_FLL_CLK_SRC_FS |
                        (0xf << NAU8825_GAIN_ERR_SFT));
                /* Release the semaphore. */
                nau8825_sema_release(nau8825);

                if (nau8825->mclk_freq) {
                        clk_disable_unprepare(nau8825->mclk);
                        nau8825->mclk_freq = 0;
                }

                break;
        default:
                dev_err(nau8825->dev, "Invalid clock id (%d)\n", clk_id);
                return -EINVAL;
        }

        dev_dbg(nau8825->dev, "Sysclk is %dHz and clock id is %d\n", freq,
                clk_id);
        return 0;
}

static int nau8825_set_sysclk(struct snd_soc_component *component, int clk_id,
        int source, unsigned int freq, int dir)
{
        struct nau8825 *nau8825 = snd_soc_component_get_drvdata(component);

        return nau8825_configure_sysclk(nau8825, clk_id, freq);
}

static int nau8825_resume_setup(struct nau8825 *nau8825)
{
        struct regmap *regmap = nau8825->regmap;

        /* Close clock when jack type detection at manual mode */
        nau8825_configure_sysclk(nau8825, NAU8825_CLK_DIS, 0);

        /* Clear all interruption status */
        nau8825_int_status_clear_all(regmap);

        /* Enable both insertion and ejection interruptions, and then
         * bypass de-bounce circuit.
         */
        regmap_update_bits(regmap, NAU8825_REG_INTERRUPT_MASK,
                NAU8825_IRQ_OUTPUT_EN | NAU8825_IRQ_HEADSET_COMPLETE_EN |
                NAU8825_IRQ_EJECT_EN | NAU8825_IRQ_INSERT_EN,
                NAU8825_IRQ_OUTPUT_EN | NAU8825_IRQ_HEADSET_COMPLETE_EN);
        regmap_update_bits(regmap, NAU8825_REG_JACK_DET_CTRL,
                NAU8825_JACK_DET_DB_BYPASS, NAU8825_JACK_DET_DB_BYPASS);
        regmap_update_bits(regmap, NAU8825_REG_INTERRUPT_DIS_CTRL,
                NAU8825_IRQ_INSERT_DIS | NAU8825_IRQ_EJECT_DIS, 0);

        return 0;
}

static int nau8825_set_bias_level(struct snd_soc_component *component,
                                   enum snd_soc_bias_level level)
{
        struct nau8825 *nau8825 = snd_soc_component_get_drvdata(component);
        int ret;

        switch (level) {
        case SND_SOC_BIAS_ON:
                break;

        case SND_SOC_BIAS_PREPARE:
                break;

        case SND_SOC_BIAS_STANDBY:
                if (snd_soc_component_get_bias_level(component) == SND_SOC_BIAS_OFF) {
                        if (nau8825->mclk_freq) {
                                ret = clk_prepare_enable(nau8825->mclk);
                                if (ret) {
                                        dev_err(nau8825->dev, "Unable to prepare component mclk\n");
                                        return ret;
                                }
                        }
                        /* Setup codec configuration after resume */
                        nau8825_resume_setup(nau8825);
                }
                break;

        case SND_SOC_BIAS_OFF:
                /* Reset the configuration of jack type for detection */
                /* Detach 2kOhm Resistors from MICBIAS to MICGND1/2 */
                regmap_update_bits(nau8825->regmap, NAU8825_REG_MIC_BIAS,
                        NAU8825_MICBIAS_JKSLV | NAU8825_MICBIAS_JKR2, 0);
                /* ground HPL/HPR, MICGRND1/2 */
                regmap_update_bits(nau8825->regmap,
                        NAU8825_REG_HSD_CTRL, 0xf, 0xf);
                /* Cancel and reset cross talk detection funciton */
                nau8825_xtalk_cancel(nau8825);
                /* Turn off all interruptions before system shutdown. Keep the
                 * interruption quiet before resume setup completes.
                 */
                regmap_write(nau8825->regmap,
                        NAU8825_REG_INTERRUPT_DIS_CTRL, 0xffff);
                /* Disable ADC needed for interruptions at audo mode */
                regmap_update_bits(nau8825->regmap, NAU8825_REG_ENA_CTRL,
                        NAU8825_ENABLE_ADC, 0);
                if (nau8825->mclk_freq)
                        clk_disable_unprepare(nau8825->mclk);
                break;
        }
        return 0;
}

static int __maybe_unused nau8825_suspend(struct snd_soc_component *component)
{
        struct nau8825 *nau8825 = snd_soc_component_get_drvdata(component);

        disable_irq(nau8825->irq);
        snd_soc_component_force_bias_level(component, SND_SOC_BIAS_OFF);
        /* Power down codec power; don't suppoet button wakeup */
        snd_soc_dapm_disable_pin(nau8825->dapm, "SAR");
        snd_soc_dapm_disable_pin(nau8825->dapm, "MICBIAS");
        snd_soc_dapm_sync(nau8825->dapm);
        regcache_cache_only(nau8825->regmap, true);
        regcache_mark_dirty(nau8825->regmap);

        return 0;
}

static int __maybe_unused nau8825_resume(struct snd_soc_component *component)
{
        struct nau8825 *nau8825 = snd_soc_component_get_drvdata(component);
        int ret;

        regcache_cache_only(nau8825->regmap, false);
        regcache_sync(nau8825->regmap);
        nau8825->xtalk_protect = true;
        ret = nau8825_sema_acquire(nau8825, 0);
        if (ret)
                nau8825->xtalk_protect = false;
        enable_irq(nau8825->irq);

        return 0;
}

static const struct snd_soc_component_driver nau8825_component_driver = {
        .probe                  = nau8825_component_probe,
        .remove                 = nau8825_component_remove,
        .set_sysclk             = nau8825_set_sysclk,
        .set_pll                = nau8825_set_pll,
        .set_bias_level         = nau8825_set_bias_level,
        .suspend                = nau8825_suspend,
        .resume                 = nau8825_resume,
        .controls               = nau8825_controls,
        .num_controls           = ARRAY_SIZE(nau8825_controls),
        .dapm_widgets           = nau8825_dapm_widgets,
        .num_dapm_widgets       = ARRAY_SIZE(nau8825_dapm_widgets),
        .dapm_routes            = nau8825_dapm_routes,
        .num_dapm_routes        = ARRAY_SIZE(nau8825_dapm_routes),
        .suspend_bias_off       = 1,
        .idle_bias_on           = 1,
        .use_pmdown_time        = 1,
        .endianness             = 1,
        .non_legacy_dai_naming  = 1,
};

static void nau8825_reset_chip(struct regmap *regmap)
{
        regmap_write(regmap, NAU8825_REG_RESET, 0x00);
        regmap_write(regmap, NAU8825_REG_RESET, 0x00);
}

static void nau8825_print_device_properties(struct nau8825 *nau8825)
{
        int i;
        struct device *dev = nau8825->dev;

        dev_dbg(dev, "jkdet-enable:         %d\n", nau8825->jkdet_enable);
        dev_dbg(dev, "jkdet-pull-enable:    %d\n", nau8825->jkdet_pull_enable);
        dev_dbg(dev, "jkdet-pull-up:        %d\n", nau8825->jkdet_pull_up);
        dev_dbg(dev, "jkdet-polarity:       %d\n", nau8825->jkdet_polarity);
        dev_dbg(dev, "micbias-voltage:      %d\n", nau8825->micbias_voltage);
        dev_dbg(dev, "vref-impedance:       %d\n", nau8825->vref_impedance);

        dev_dbg(dev, "sar-threshold-num:    %d\n", nau8825->sar_threshold_num);
        for (i = 0; i < nau8825->sar_threshold_num; i++)
                dev_dbg(dev, "sar-threshold[%d]=%d\n", i,
                                nau8825->sar_threshold[i]);

        dev_dbg(dev, "sar-hysteresis:       %d\n", nau8825->sar_hysteresis);
        dev_dbg(dev, "sar-voltage:          %d\n", nau8825->sar_voltage);
        dev_dbg(dev, "sar-compare-time:     %d\n", nau8825->sar_compare_time);
        dev_dbg(dev, "sar-sampling-time:    %d\n", nau8825->sar_sampling_time);
        dev_dbg(dev, "short-key-debounce:   %d\n", nau8825->key_debounce);
        dev_dbg(dev, "jack-insert-debounce: %d\n",
                        nau8825->jack_insert_debounce);
        dev_dbg(dev, "jack-eject-debounce:  %d\n",
                        nau8825->jack_eject_debounce);
        dev_dbg(dev, "crosstalk-enable:     %d\n",
                        nau8825->xtalk_enable);
}

static int nau8825_read_device_properties(struct device *dev,
        struct nau8825 *nau8825) {
        int ret;

        nau8825->jkdet_enable = device_property_read_bool(dev,
                "nuvoton,jkdet-enable");
        nau8825->jkdet_pull_enable = device_property_read_bool(dev,
                "nuvoton,jkdet-pull-enable");
        nau8825->jkdet_pull_up = device_property_read_bool(dev,
                "nuvoton,jkdet-pull-up");
        ret = device_property_read_u32(dev, "nuvoton,jkdet-polarity",
                &nau8825->jkdet_polarity);
        if (ret)
                nau8825->jkdet_polarity = 1;
        ret = device_property_read_u32(dev, "nuvoton,micbias-voltage",
                &nau8825->micbias_voltage);
        if (ret)
                nau8825->micbias_voltage = 6;
        ret = device_property_read_u32(dev, "nuvoton,vref-impedance",
                &nau8825->vref_impedance);
        if (ret)
                nau8825->vref_impedance = 2;
        ret = device_property_read_u32(dev, "nuvoton,sar-threshold-num",
                &nau8825->sar_threshold_num);
        if (ret)
                nau8825->sar_threshold_num = 4;
        ret = device_property_read_u32_array(dev, "nuvoton,sar-threshold",
                nau8825->sar_threshold, nau8825->sar_threshold_num);
        if (ret) {
                nau8825->sar_threshold[0] = 0x08;
                nau8825->sar_threshold[1] = 0x12;
                nau8825->sar_threshold[2] = 0x26;
                nau8825->sar_threshold[3] = 0x73;
        }
        ret = device_property_read_u32(dev, "nuvoton,sar-hysteresis",
                &nau8825->sar_hysteresis);
        if (ret)
                nau8825->sar_hysteresis = 0;
        ret = device_property_read_u32(dev, "nuvoton,sar-voltage",
                &nau8825->sar_voltage);
        if (ret)
                nau8825->sar_voltage = 6;
        ret = device_property_read_u32(dev, "nuvoton,sar-compare-time",
                &nau8825->sar_compare_time);
        if (ret)
                nau8825->sar_compare_time = 1;
        ret = device_property_read_u32(dev, "nuvoton,sar-sampling-time",
                &nau8825->sar_sampling_time);
        if (ret)
                nau8825->sar_sampling_time = 1;
        ret = device_property_read_u32(dev, "nuvoton,short-key-debounce",
                &nau8825->key_debounce);
        if (ret)
                nau8825->key_debounce = 3;
        ret = device_property_read_u32(dev, "nuvoton,jack-insert-debounce",
                &nau8825->jack_insert_debounce);
        if (ret)
                nau8825->jack_insert_debounce = 7;
        ret = device_property_read_u32(dev, "nuvoton,jack-eject-debounce",
                &nau8825->jack_eject_debounce);
        if (ret)
                nau8825->jack_eject_debounce = 0;
        nau8825->xtalk_enable = device_property_read_bool(dev,
                "nuvoton,crosstalk-enable");

        nau8825->mclk = devm_clk_get(dev, "mclk");
        if (PTR_ERR(nau8825->mclk) == -EPROBE_DEFER) {
                return -EPROBE_DEFER;
        } else if (PTR_ERR(nau8825->mclk) == -ENOENT) {
                /* The MCLK is managed externally or not used at all */
                nau8825->mclk = NULL;
                dev_info(dev, "No 'mclk' clock found, assume MCLK is managed externally");
        } else if (IS_ERR(nau8825->mclk)) {
                return -EINVAL;
        }

        return 0;
}

static int nau8825_setup_irq(struct nau8825 *nau8825)
{
        int ret;

        ret = devm_request_threaded_irq(nau8825->dev, nau8825->irq, NULL,
                nau8825_interrupt, IRQF_TRIGGER_LOW | IRQF_ONESHOT,
                "nau8825", nau8825);

        if (ret) {
                dev_err(nau8825->dev, "Cannot request irq %d (%d)\n",
                        nau8825->irq, ret);
                return ret;
        }

        return 0;
}

static int nau8825_i2c_probe(struct i2c_client *i2c,
        const struct i2c_device_id *id)
{
        struct device *dev = &i2c->dev;
        struct nau8825 *nau8825 = dev_get_platdata(&i2c->dev);
        int ret, value;

        if (!nau8825) {
                nau8825 = devm_kzalloc(dev, sizeof(*nau8825), GFP_KERNEL);
                if (!nau8825)
                        return -ENOMEM;
                ret = nau8825_read_device_properties(dev, nau8825);
                if (ret)
                        return ret;
        }

        i2c_set_clientdata(i2c, nau8825);

        nau8825->regmap = devm_regmap_init_i2c(i2c, &nau8825_regmap_config);
        if (IS_ERR(nau8825->regmap))
                return PTR_ERR(nau8825->regmap);
        nau8825->dev = dev;
        nau8825->irq = i2c->irq;
        /* Initiate parameters, semaphore and work queue which are needed in
         * cross talk suppression measurment function.
         */
        nau8825->xtalk_state = NAU8825_XTALK_DONE;
        nau8825->xtalk_protect = false;
        nau8825->xtalk_baktab_initialized = false;
        sema_init(&nau8825->xtalk_sem, 1);
        INIT_WORK(&nau8825->xtalk_work, nau8825_xtalk_work);

        nau8825_print_device_properties(nau8825);

        nau8825_reset_chip(nau8825->regmap);
        ret = regmap_read(nau8825->regmap, NAU8825_REG_I2C_DEVICE_ID, &value);
        if (ret < 0) {
                dev_err(dev, "Failed to read device id from the NAU8825: %d\n",
                        ret);
                return ret;
        }
        if ((value & NAU8825_SOFTWARE_ID_MASK) !=
                        NAU8825_SOFTWARE_ID_NAU8825) {
                dev_err(dev, "Not a NAU8825 chip\n");
                return -ENODEV;
        }

        nau8825_init_regs(nau8825);

        if (i2c->irq)
                nau8825_setup_irq(nau8825);

        return devm_snd_soc_register_component(&i2c->dev,
                &nau8825_component_driver,
                &nau8825_dai, 1);
}

static int nau8825_i2c_remove(struct i2c_client *client)
{
        return 0;
}

static const struct i2c_device_id nau8825_i2c_ids[] = {
        { "nau8825", 0 },
        { }
};
MODULE_DEVICE_TABLE(i2c, nau8825_i2c_ids);

#ifdef CONFIG_OF
static const struct of_device_id nau8825_of_ids[] = {
        { .compatible = "nuvoton,nau8825", },
        {}
};
MODULE_DEVICE_TABLE(of, nau8825_of_ids);
#endif

#ifdef CONFIG_ACPI
static const struct acpi_device_id nau8825_acpi_match[] = {
        { "10508825", 0 },
        {},
};
MODULE_DEVICE_TABLE(acpi, nau8825_acpi_match);
#endif

static struct i2c_driver nau8825_driver = {
        .driver = {
                .name = "nau8825",
                .of_match_table = of_match_ptr(nau8825_of_ids),
                .acpi_match_table = ACPI_PTR(nau8825_acpi_match),
        },
        .probe = nau8825_i2c_probe,
        .remove = nau8825_i2c_remove,
        .id_table = nau8825_i2c_ids,
};
module_i2c_driver(nau8825_driver);

MODULE_DESCRIPTION("ASoC nau8825 driver");
MODULE_AUTHOR("Anatol Pomozov <anatol@chromium.org>");
MODULE_LICENSE("GPL");