ssm2602.c

Go to the documentation of this file.

/*
 * File:         sound/soc/codecs/ssm2602.c
 * Author:       Cliff Cai <[email protected]>
 *
 * Created:      Tue June 06 2008
 * Description:  Driver for ssm2602 sound chip
 *
 * Modified:
 *               Copyright 2008 Analog Devices Inc.
 *
 * Bugs:         Enter bugs at http://blackfin.uclinux.org/
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see the file COPYING, or write
 * to the Free Software Foundation, Inc.,
 * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/pm.h>
#include <linux/i2c.h>
#include <linux/spi/spi.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/initval.h>
#include <sound/tlv.h>

#include "ssm2602.h"

enum ssm2602_type {
    SSM2602,
    SSM2604,
};

/* codec private data */
struct ssm2602_priv {
    unsigned int sysclk;
    struct snd_pcm_hw_constraint_list *sysclk_constraints;
    struct snd_pcm_substream *master_substream;
    struct snd_pcm_substream *slave_substream;

    struct regmap *regmap;

    enum ssm2602_type type;
    unsigned int clk_out_pwr;
};

/*
 * ssm2602 register cache
 * We can't read the ssm2602 register space when we are
 * using 2 wire for device control, so we cache them instead.
 * There is no point in caching the reset register
 */
static const u16 ssm2602_reg[SSM2602_CACHEREGNUM] = {
    0x0097, 0x0097, 0x0079, 0x0079,
    0x000a, 0x0008, 0x009f, 0x000a,
    0x0000, 0x0000
};


/*Appending several "None"s just for OSS mixer use*/
static const char *ssm2602_input_select[] = {
    "Line", "Mic", "None", "None", "None",
    "None", "None", "None",
};

static const char *ssm2602_deemph[] = {"None", "32Khz", "44.1Khz", "48Khz"};

static const struct soc_enum ssm2602_enum[] = {
    SOC_ENUM_SINGLE(SSM2602_APANA, 2, 2, ssm2602_input_select),
    SOC_ENUM_SINGLE(SSM2602_APDIGI, 1, 4, ssm2602_deemph),
};

static const unsigned int ssm260x_outmix_tlv[] = {
    TLV_DB_RANGE_HEAD(2),
    0, 47, TLV_DB_SCALE_ITEM(TLV_DB_GAIN_MUTE, 0, 0),
    48, 127, TLV_DB_SCALE_ITEM(-7400, 100, 0),
};

static const DECLARE_TLV_DB_SCALE(ssm260x_inpga_tlv, -3450, 150, 0);
static const DECLARE_TLV_DB_SCALE(ssm260x_sidetone_tlv, -1500, 300, 0);

static const struct snd_kcontrol_new ssm260x_snd_controls[] = {
SOC_DOUBLE_R_TLV("Capture Volume", SSM2602_LINVOL, SSM2602_RINVOL, 0, 45, 0,
    ssm260x_inpga_tlv),
SOC_DOUBLE_R("Capture Switch", SSM2602_LINVOL, SSM2602_RINVOL, 7, 1, 1),

SOC_SINGLE("ADC High Pass Filter Switch", SSM2602_APDIGI, 0, 1, 1),
SOC_SINGLE("Store DC Offset Switch", SSM2602_APDIGI, 4, 1, 0),

SOC_ENUM("Playback De-emphasis", ssm2602_enum[1]),
};

static const struct snd_kcontrol_new ssm2602_snd_controls[] = {
SOC_DOUBLE_R_TLV("Master Playback Volume", SSM2602_LOUT1V, SSM2602_ROUT1V,
    0, 127, 0, ssm260x_outmix_tlv),
SOC_DOUBLE_R("Master Playback ZC Switch", SSM2602_LOUT1V, SSM2602_ROUT1V,
    7, 1, 0),
SOC_SINGLE_TLV("Sidetone Playback Volume", SSM2602_APANA, 6, 3, 1,
    ssm260x_sidetone_tlv),

SOC_SINGLE("Mic Boost (+20dB)", SSM2602_APANA, 0, 1, 0),
SOC_SINGLE("Mic Boost2 (+20dB)", SSM2602_APANA, 8, 1, 0),
SOC_SINGLE("Mic Switch", SSM2602_APANA, 1, 1, 1),
};

/* Output Mixer */
static const struct snd_kcontrol_new ssm260x_output_mixer_controls[] = {
SOC_DAPM_SINGLE("Line Bypass Switch", SSM2602_APANA, 3, 1, 0),
SOC_DAPM_SINGLE("HiFi Playback Switch", SSM2602_APANA, 4, 1, 0),
SOC_DAPM_SINGLE("Mic Sidetone Switch", SSM2602_APANA, 5, 1, 0),
};

/* Input mux */
static const struct snd_kcontrol_new ssm2602_input_mux_controls =
SOC_DAPM_ENUM("Input Select", ssm2602_enum[0]);

static const struct snd_soc_dapm_widget ssm260x_dapm_widgets[] = {
SND_SOC_DAPM_DAC("DAC", "HiFi Playback", SSM2602_PWR, 3, 1),
SND_SOC_DAPM_ADC("ADC", "HiFi Capture", SSM2602_PWR, 2, 1),
SND_SOC_DAPM_PGA("Line Input", SSM2602_PWR, 0, 1, NULL, 0),

SND_SOC_DAPM_SUPPLY("Digital Core Power", SSM2602_ACTIVE, 0, 0, NULL, 0),

SND_SOC_DAPM_OUTPUT("LOUT"),
SND_SOC_DAPM_OUTPUT("ROUT"),
SND_SOC_DAPM_INPUT("RLINEIN"),
SND_SOC_DAPM_INPUT("LLINEIN"),
};

static const struct snd_soc_dapm_widget ssm2602_dapm_widgets[] = {
SND_SOC_DAPM_MIXER("Output Mixer", SSM2602_PWR, 4, 1,
    ssm260x_output_mixer_controls,
    ARRAY_SIZE(ssm260x_output_mixer_controls)),

SND_SOC_DAPM_MUX("Input Mux", SND_SOC_NOPM, 0, 0, &ssm2602_input_mux_controls),
SND_SOC_DAPM_MICBIAS("Mic Bias", SSM2602_PWR, 1, 1),

SND_SOC_DAPM_OUTPUT("LHPOUT"),
SND_SOC_DAPM_OUTPUT("RHPOUT"),
SND_SOC_DAPM_INPUT("MICIN"),
};

static const struct snd_soc_dapm_widget ssm2604_dapm_widgets[] = {
SND_SOC_DAPM_MIXER("Output Mixer", SND_SOC_NOPM, 0, 0,
    ssm260x_output_mixer_controls,
    ARRAY_SIZE(ssm260x_output_mixer_controls) - 1), /* Last element is the mic */
};

static const struct snd_soc_dapm_route ssm260x_routes[] = {
    {"DAC", NULL, "Digital Core Power"},
    {"ADC", NULL, "Digital Core Power"},

    {"Output Mixer", "Line Bypass Switch", "Line Input"},
    {"Output Mixer", "HiFi Playback Switch", "DAC"},

    {"ROUT", NULL, "Output Mixer"},
    {"LOUT", NULL, "Output Mixer"},

    {"Line Input", NULL, "LLINEIN"},
    {"Line Input", NULL, "RLINEIN"},
};

static const struct snd_soc_dapm_route ssm2602_routes[] = {
    {"Output Mixer", "Mic Sidetone Switch", "Mic Bias"},

    {"RHPOUT", NULL, "Output Mixer"},
    {"LHPOUT", NULL, "Output Mixer"},

    {"Input Mux", "Line", "Line Input"},
    {"Input Mux", "Mic", "Mic Bias"},
    {"ADC", NULL, "Input Mux"},

    {"Mic Bias", NULL, "MICIN"},
};

static const struct snd_soc_dapm_route ssm2604_routes[] = {
    {"ADC", NULL, "Line Input"},
};

static const unsigned int ssm2602_rates_12288000[] = {
    8000, 32000, 48000, 96000,
};

static struct snd_pcm_hw_constraint_list ssm2602_constraints_12288000 = {
    .list = ssm2602_rates_12288000,
    .count = ARRAY_SIZE(ssm2602_rates_12288000),
};

static const unsigned int ssm2602_rates_11289600[] = {
    8000, 44100, 88200,
};

static struct snd_pcm_hw_constraint_list ssm2602_constraints_11289600 = {
    .list = ssm2602_rates_11289600,
    .count = ARRAY_SIZE(ssm2602_rates_11289600),
};

struct ssm2602_coeff {
    u32 mclk;
    u32 rate;
    u8 srate;
};

#define SSM2602_COEFF_SRATE(sr, bosr, usb) (((sr) << 2) | ((bosr) << 1) | (usb))

/* codec mclk clock coefficients */
static const struct ssm2602_coeff ssm2602_coeff_table[] = {
    /* 48k */
    {12288000, 48000, SSM2602_COEFF_SRATE(0x0, 0x0, 0x0)},
    {18432000, 48000, SSM2602_COEFF_SRATE(0x0, 0x1, 0x0)},
    {12000000, 48000, SSM2602_COEFF_SRATE(0x0, 0x0, 0x1)},

    /* 32k */
    {12288000, 32000, SSM2602_COEFF_SRATE(0x6, 0x0, 0x0)},
    {18432000, 32000, SSM2602_COEFF_SRATE(0x6, 0x1, 0x0)},
    {12000000, 32000, SSM2602_COEFF_SRATE(0x6, 0x0, 0x1)},

    /* 8k */
    {12288000, 8000, SSM2602_COEFF_SRATE(0x3, 0x0, 0x0)},
    {18432000, 8000, SSM2602_COEFF_SRATE(0x3, 0x1, 0x0)},
    {11289600, 8000, SSM2602_COEFF_SRATE(0xb, 0x0, 0x0)},
    {16934400, 8000, SSM2602_COEFF_SRATE(0xb, 0x1, 0x0)},
    {12000000, 8000, SSM2602_COEFF_SRATE(0x3, 0x0, 0x1)},

    /* 96k */
    {12288000, 96000, SSM2602_COEFF_SRATE(0x7, 0x0, 0x0)},
    {18432000, 96000, SSM2602_COEFF_SRATE(0x7, 0x1, 0x0)},
    {12000000, 96000, SSM2602_COEFF_SRATE(0x7, 0x0, 0x1)},

    /* 44.1k */
    {11289600, 44100, SSM2602_COEFF_SRATE(0x8, 0x0, 0x0)},
    {16934400, 44100, SSM2602_COEFF_SRATE(0x8, 0x1, 0x0)},
    {12000000, 44100, SSM2602_COEFF_SRATE(0x8, 0x1, 0x1)},

    /* 88.2k */
    {11289600, 88200, SSM2602_COEFF_SRATE(0xf, 0x0, 0x0)},
    {16934400, 88200, SSM2602_COEFF_SRATE(0xf, 0x1, 0x0)},
    {12000000, 88200, SSM2602_COEFF_SRATE(0xf, 0x1, 0x1)},
};

static inline int ssm2602_get_coeff(int mclk, int rate)
{
    int i;

    for (i = 0; i < ARRAY_SIZE(ssm2602_coeff_table); i++) {
        if (ssm2602_coeff_table[i].rate == rate &&
            ssm2602_coeff_table[i].mclk == mclk)
            return ssm2602_coeff_table[i].srate;
    }
    return -EINVAL;
}

static int ssm2602_hw_params(struct snd_pcm_substream *substream,
    struct snd_pcm_hw_params *params,
    struct snd_soc_dai *dai)
{
    struct snd_soc_codec *codec = dai->codec;
    struct ssm2602_priv *ssm2602 = snd_soc_codec_get_drvdata(codec);
    int srate = ssm2602_get_coeff(ssm2602->sysclk, params_rate(params));
    unsigned int iface;

    if (substream == ssm2602->slave_substream) {
        dev_dbg(codec->dev, "Ignoring hw_params for slave substream\n");
        return 0;
    }

    if (srate < 0)
        return srate;

    regmap_write(ssm2602->regmap, SSM2602_SRATE, srate);

    /* bit size */
    switch (params_format(params)) {
    case SNDRV_PCM_FORMAT_S16_LE:
        iface = 0x0;
        break;
    case SNDRV_PCM_FORMAT_S20_3LE:
        iface = 0x4;
        break;
    case SNDRV_PCM_FORMAT_S24_LE:
        iface = 0x8;
        break;
    case SNDRV_PCM_FORMAT_S32_LE:
        iface = 0xc;
        break;
    default:
        return -EINVAL;
    }
    regmap_update_bits(ssm2602->regmap, SSM2602_IFACE,
        IFACE_AUDIO_DATA_LEN, iface);
    return 0;
}

static int ssm2602_startup(struct snd_pcm_substream *substream,
               struct snd_soc_dai *dai)
{
    struct snd_soc_codec *codec = dai->codec;
    struct ssm2602_priv *ssm2602 = snd_soc_codec_get_drvdata(codec);
    struct snd_pcm_runtime *master_runtime;

    /* The DAI has shared clocks so if we already have a playback or
     * capture going then constrain this substream to match it.
     * TODO: the ssm2602 allows pairs of non-matching PB/REC rates
     */
    if (ssm2602->master_substream) {
        master_runtime = ssm2602->master_substream->runtime;
        dev_dbg(codec->dev, "Constraining to %d bits at %dHz\n",
            master_runtime->sample_bits,
            master_runtime->rate);

        if (master_runtime->rate != 0)
            snd_pcm_hw_constraint_minmax(substream->runtime,
                             SNDRV_PCM_HW_PARAM_RATE,
                             master_runtime->rate,
                             master_runtime->rate);

        if (master_runtime->sample_bits != 0)
            snd_pcm_hw_constraint_minmax(substream->runtime,
                             SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
                             master_runtime->sample_bits,
                             master_runtime->sample_bits);

        ssm2602->slave_substream = substream;
    } else
        ssm2602->master_substream = substream;

    if (ssm2602->sysclk_constraints) {
        snd_pcm_hw_constraint_list(substream->runtime, 0,
                   SNDRV_PCM_HW_PARAM_RATE,
                   ssm2602->sysclk_constraints);
    }

    return 0;
}

static void ssm2602_shutdown(struct snd_pcm_substream *substream,
                 struct snd_soc_dai *dai)
{
    struct snd_soc_codec *codec = dai->codec;
    struct ssm2602_priv *ssm2602 = snd_soc_codec_get_drvdata(codec);

    if (ssm2602->master_substream == substream)
        ssm2602->master_substream = ssm2602->slave_substream;

    ssm2602->slave_substream = NULL;
}


static int ssm2602_mute(struct snd_soc_dai *dai, int mute)
{
    struct ssm2602_priv *ssm2602 = snd_soc_codec_get_drvdata(dai->codec);

    if (mute)
        regmap_update_bits(ssm2602->regmap, SSM2602_APDIGI,
                    APDIGI_ENABLE_DAC_MUTE,
                    APDIGI_ENABLE_DAC_MUTE);
    else
        regmap_update_bits(ssm2602->regmap, SSM2602_APDIGI,
                    APDIGI_ENABLE_DAC_MUTE, 0);
    return 0;
}

static int ssm2602_set_dai_sysclk(struct snd_soc_dai *codec_dai,
        int clk_id, unsigned int freq, int dir)
{
    struct snd_soc_codec *codec = codec_dai->codec;
    struct ssm2602_priv *ssm2602 = snd_soc_codec_get_drvdata(codec);

    if (dir == SND_SOC_CLOCK_IN) {
        if (clk_id != SSM2602_SYSCLK)
            return -EINVAL;

        switch (freq) {
        case 12288000:
        case 18432000:
            ssm2602->sysclk_constraints = &ssm2602_constraints_12288000;
            break;
        case 11289600:
        case 16934400:
            ssm2602->sysclk_constraints = &ssm2602_constraints_11289600;
            break;
        case 12000000:
            ssm2602->sysclk_constraints = NULL;
            break;
        default:
            return -EINVAL;
        }
        ssm2602->sysclk = freq;
    } else {
        unsigned int mask;

        switch (clk_id) {
        case SSM2602_CLK_CLKOUT:
            mask = PWR_CLK_OUT_PDN;
            break;
        case SSM2602_CLK_XTO:
            mask = PWR_OSC_PDN;
            break;
        default:
            return -EINVAL;
        }

        if (freq == 0)
            ssm2602->clk_out_pwr |= mask;
        else
            ssm2602->clk_out_pwr &= ~mask;

        regmap_update_bits(ssm2602->regmap, SSM2602_PWR,
            PWR_CLK_OUT_PDN | PWR_OSC_PDN, ssm2602->clk_out_pwr);
    }

    return 0;
}

static int ssm2602_set_dai_fmt(struct snd_soc_dai *codec_dai,
        unsigned int fmt)
{
    struct ssm2602_priv *ssm2602 = snd_soc_codec_get_drvdata(codec_dai->codec);
    unsigned int iface = 0;

    /* set master/slave audio interface */
    switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
    case SND_SOC_DAIFMT_CBM_CFM:
        iface |= 0x0040;
        break;
    case SND_SOC_DAIFMT_CBS_CFS:
        break;
    default:
        return -EINVAL;
    }

    /* interface format */
    switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
    case SND_SOC_DAIFMT_I2S:
        iface |= 0x0002;
        break;
    case SND_SOC_DAIFMT_RIGHT_J:
        break;
    case SND_SOC_DAIFMT_LEFT_J:
        iface |= 0x0001;
        break;
    case SND_SOC_DAIFMT_DSP_A:
        iface |= 0x0013;
        break;
    case SND_SOC_DAIFMT_DSP_B:
        iface |= 0x0003;
        break;
    default:
        return -EINVAL;
    }

    /* clock inversion */
    switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
    case SND_SOC_DAIFMT_NB_NF:
        break;
    case SND_SOC_DAIFMT_IB_IF:
        iface |= 0x0090;
        break;
    case SND_SOC_DAIFMT_IB_NF:
        iface |= 0x0080;
        break;
    case SND_SOC_DAIFMT_NB_IF:
        iface |= 0x0010;
        break;
    default:
        return -EINVAL;
    }

    /* set iface */
    regmap_write(ssm2602->regmap, SSM2602_IFACE, iface);
    return 0;
}

static int ssm2602_set_bias_level(struct snd_soc_codec *codec,
                 enum snd_soc_bias_level level)
{
    struct ssm2602_priv *ssm2602 = snd_soc_codec_get_drvdata(codec);

    switch (level) {
    case SND_SOC_BIAS_ON:
        /* vref/mid on, osc and clkout on if enabled */
        regmap_update_bits(ssm2602->regmap, SSM2602_PWR,
            PWR_POWER_OFF | PWR_CLK_OUT_PDN | PWR_OSC_PDN,
            ssm2602->clk_out_pwr);
        break;
    case SND_SOC_BIAS_PREPARE:
        break;
    case SND_SOC_BIAS_STANDBY:
        /* everything off except vref/vmid, */
        regmap_update_bits(ssm2602->regmap, SSM2602_PWR,
            PWR_POWER_OFF | PWR_CLK_OUT_PDN | PWR_OSC_PDN,
            PWR_CLK_OUT_PDN | PWR_OSC_PDN);
        break;
    case SND_SOC_BIAS_OFF:
        /* everything off */
        regmap_update_bits(ssm2602->regmap, SSM2602_PWR,
            PWR_POWER_OFF, PWR_POWER_OFF);
        break;

    }
    codec->dapm.bias_level = level;
    return 0;
}

#define SSM2602_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_32000 |\
        SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 |\
        SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000)

#define SSM2602_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
        SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S32_LE)

static const struct snd_soc_dai_ops ssm2602_dai_ops = {
    .startup    = ssm2602_startup,
    .hw_params  = ssm2602_hw_params,
    .shutdown   = ssm2602_shutdown,
    .digital_mute   = ssm2602_mute,
    .set_sysclk = ssm2602_set_dai_sysclk,
    .set_fmt    = ssm2602_set_dai_fmt,
};

static struct snd_soc_dai_driver ssm2602_dai = {
    .name = "ssm2602-hifi",
    .playback = {
        .stream_name = "Playback",
        .channels_min = 2,
        .channels_max = 2,
        .rates = SSM2602_RATES,
        .formats = SSM2602_FORMATS,},
    .capture = {
        .stream_name = "Capture",
        .channels_min = 2,
        .channels_max = 2,
        .rates = SSM2602_RATES,
        .formats = SSM2602_FORMATS,},
    .ops = &ssm2602_dai_ops,
};

static int ssm2602_suspend(struct snd_soc_codec *codec)
{
    ssm2602_set_bias_level(codec, SND_SOC_BIAS_OFF);
    return 0;
}

static int ssm2602_resume(struct snd_soc_codec *codec)
{
    snd_soc_cache_sync(codec);

    ssm2602_set_bias_level(codec, SND_SOC_BIAS_STANDBY);

    return 0;
}

static int ssm2602_probe(struct snd_soc_codec *codec)
{
    struct ssm2602_priv *ssm2602 = snd_soc_codec_get_drvdata(codec);
    struct snd_soc_dapm_context *dapm = &codec->dapm;
    int ret;

    regmap_update_bits(ssm2602->regmap, SSM2602_LOUT1V,
                LOUT1V_LRHP_BOTH, LOUT1V_LRHP_BOTH);
    regmap_update_bits(ssm2602->regmap, SSM2602_ROUT1V,
                ROUT1V_RLHP_BOTH, ROUT1V_RLHP_BOTH);

    ret = snd_soc_add_codec_controls(codec, ssm2602_snd_controls,
            ARRAY_SIZE(ssm2602_snd_controls));
    if (ret)
        return ret;

    ret = snd_soc_dapm_new_controls(dapm, ssm2602_dapm_widgets,
            ARRAY_SIZE(ssm2602_dapm_widgets));
    if (ret)
        return ret;

    return snd_soc_dapm_add_routes(dapm, ssm2602_routes,
            ARRAY_SIZE(ssm2602_routes));
}

static int ssm2604_probe(struct snd_soc_codec *codec)
{
    struct snd_soc_dapm_context *dapm = &codec->dapm;
    int ret;

    ret = snd_soc_dapm_new_controls(dapm, ssm2604_dapm_widgets,
            ARRAY_SIZE(ssm2604_dapm_widgets));
    if (ret)
        return ret;

    return snd_soc_dapm_add_routes(dapm, ssm2604_routes,
            ARRAY_SIZE(ssm2604_routes));
}

static int ssm260x_probe(struct snd_soc_codec *codec)
{
    struct ssm2602_priv *ssm2602 = snd_soc_codec_get_drvdata(codec);
    int ret;

    codec->control_data = ssm2602->regmap;
    ret = snd_soc_codec_set_cache_io(codec, 0, 0, SND_SOC_REGMAP);
    if (ret < 0) {
        dev_err(codec->dev, "Failed to set cache I/O: %d\n", ret);
        return ret;
    }

    ret = regmap_write(ssm2602->regmap, SSM2602_RESET, 0);
    if (ret < 0) {
        dev_err(codec->dev, "Failed to issue reset: %d\n", ret);
        return ret;
    }

    /* set the update bits */
    regmap_update_bits(ssm2602->regmap, SSM2602_LINVOL,
                LINVOL_LRIN_BOTH, LINVOL_LRIN_BOTH);
    regmap_update_bits(ssm2602->regmap, SSM2602_RINVOL,
                RINVOL_RLIN_BOTH, RINVOL_RLIN_BOTH);
    /*select Line in as default input*/
    regmap_write(ssm2602->regmap, SSM2602_APANA, APANA_SELECT_DAC |
            APANA_ENABLE_MIC_BOOST);

    switch (ssm2602->type) {
    case SSM2602:
        ret = ssm2602_probe(codec);
        break;
    case SSM2604:
        ret = ssm2604_probe(codec);
        break;
    }

    if (ret)
        return ret;

    ssm2602_set_bias_level(codec, SND_SOC_BIAS_STANDBY);

    return 0;
}

/* remove everything here */
static int ssm2602_remove(struct snd_soc_codec *codec)
{
    ssm2602_set_bias_level(codec, SND_SOC_BIAS_OFF);
    return 0;
}

static struct snd_soc_codec_driver soc_codec_dev_ssm2602 = {
    .probe =    ssm260x_probe,
    .remove =   ssm2602_remove,
    .suspend =  ssm2602_suspend,
    .resume =   ssm2602_resume,
    .set_bias_level = ssm2602_set_bias_level,

    .controls = ssm260x_snd_controls,
    .num_controls = ARRAY_SIZE(ssm260x_snd_controls),
    .dapm_widgets = ssm260x_dapm_widgets,
    .num_dapm_widgets = ARRAY_SIZE(ssm260x_dapm_widgets),
    .dapm_routes = ssm260x_routes,
    .num_dapm_routes = ARRAY_SIZE(ssm260x_routes),
};

static bool ssm2602_register_volatile(struct device *dev, unsigned int reg)
{
    return reg == SSM2602_RESET;
}

static const struct regmap_config ssm2602_regmap_config = {
    .val_bits = 9,
    .reg_bits = 7,

    .max_register = SSM2602_RESET,
    .volatile_reg = ssm2602_register_volatile,

    .cache_type = REGCACHE_RBTREE,
    .reg_defaults_raw = ssm2602_reg,
    .num_reg_defaults_raw = ARRAY_SIZE(ssm2602_reg),
};

#if defined(CONFIG_SPI_MASTER)
static int __devinit ssm2602_spi_probe(struct spi_device *spi)
{
    struct ssm2602_priv *ssm2602;
    int ret;

    ssm2602 = devm_kzalloc(&spi->dev, sizeof(struct ssm2602_priv),
                   GFP_KERNEL);
    if (ssm2602 == NULL)
        return -ENOMEM;

    spi_set_drvdata(spi, ssm2602);
    ssm2602->type = SSM2602;

    ssm2602->regmap = devm_regmap_init_spi(spi, &ssm2602_regmap_config);
    if (IS_ERR(ssm2602->regmap))
        return PTR_ERR(ssm2602->regmap);

    ret = snd_soc_register_codec(&spi->dev,
            &soc_codec_dev_ssm2602, &ssm2602_dai, 1);
    return ret;
}

static int __devexit ssm2602_spi_remove(struct spi_device *spi)
{
    snd_soc_unregister_codec(&spi->dev);
    return 0;
}

static struct spi_driver ssm2602_spi_driver = {
    .driver = {
        .name   = "ssm2602",
        .owner  = THIS_MODULE,
    },
    .probe      = ssm2602_spi_probe,
    .remove     = __devexit_p(ssm2602_spi_remove),
};
#endif

#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
/*
 * ssm2602 2 wire address is determined by GPIO5
 * state during powerup.
 *    low  = 0x1a
 *    high = 0x1b
 */
static int __devinit ssm2602_i2c_probe(struct i2c_client *i2c,
                 const struct i2c_device_id *id)
{
    struct ssm2602_priv *ssm2602;
    int ret;

    ssm2602 = devm_kzalloc(&i2c->dev, sizeof(struct ssm2602_priv),
                   GFP_KERNEL);
    if (ssm2602 == NULL)
        return -ENOMEM;

    i2c_set_clientdata(i2c, ssm2602);
    ssm2602->type = id->driver_data;

    ssm2602->regmap = devm_regmap_init_i2c(i2c, &ssm2602_regmap_config);
    if (IS_ERR(ssm2602->regmap))
        return PTR_ERR(ssm2602->regmap);

    ret = snd_soc_register_codec(&i2c->dev,
            &soc_codec_dev_ssm2602, &ssm2602_dai, 1);
    return ret;
}

static int __devexit ssm2602_i2c_remove(struct i2c_client *client)
{
    snd_soc_unregister_codec(&client->dev);
    return 0;
}

static const struct i2c_device_id ssm2602_i2c_id[] = {
    { "ssm2602", SSM2602 },
    { "ssm2603", SSM2602 },
    { "ssm2604", SSM2604 },
    { }
};
MODULE_DEVICE_TABLE(i2c, ssm2602_i2c_id);

/* corgi i2c codec control layer */
static struct i2c_driver ssm2602_i2c_driver = {
    .driver = {
        .name = "ssm2602",
        .owner = THIS_MODULE,
    },
    .probe = ssm2602_i2c_probe,
    .remove = __devexit_p(ssm2602_i2c_remove),
    .id_table = ssm2602_i2c_id,
};
#endif


static int __init ssm2602_modinit(void)
{
    int ret = 0;

#if defined(CONFIG_SPI_MASTER)
    ret = spi_register_driver(&ssm2602_spi_driver);
    if (ret)
        return ret;
#endif

#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
    ret = i2c_add_driver(&ssm2602_i2c_driver);
    if (ret)
        return ret;
#endif

    return ret;
}
module_init(ssm2602_modinit);

static void __exit ssm2602_exit(void)
{
#if defined(CONFIG_SPI_MASTER)
    spi_unregister_driver(&ssm2602_spi_driver);
#endif

#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
    i2c_del_driver(&ssm2602_i2c_driver);
#endif
}
module_exit(ssm2602_exit);

MODULE_DESCRIPTION("ASoC SSM2602/SSM2603/SSM2604 driver");
MODULE_AUTHOR("Cliff Cai");
MODULE_LICENSE("GPL");