tlv320aic23.c

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/*
 * ALSA SoC TLV320AIC23 codec driver
 *
 * Author:      Arun KS, <[email protected]>
 * Copyright:   (C) 2008 Mistral Solutions Pvt Ltd.,
 *
 * Based on sound/soc/codecs/wm8731.c by Richard Purdie
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * Notes:
 *  The AIC23 is a driver for a low power stereo audio
 *  codec tlv320aic23
 *
 *  The machine layer should disable unsupported inputs/outputs by
 *  snd_soc_dapm_disable_pin(codec, "LHPOUT"), etc.
 */

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

#include "tlv320aic23.h"

/*
 * AIC23 register cache
 */
static const u16 tlv320aic23_reg[] = {
    0x0097, 0x0097, 0x00F9, 0x00F9, /* 0 */
    0x001A, 0x0004, 0x0007, 0x0001, /* 4 */
    0x0020, 0x0000, 0x0000, 0x0000, /* 8 */
    0x0000, 0x0000, 0x0000, 0x0000, /* 12 */
};

static const char *rec_src_text[] = { "Line", "Mic" };
static const char *deemph_text[] = {"None", "32Khz", "44.1Khz", "48Khz"};

static const struct soc_enum rec_src_enum =
    SOC_ENUM_SINGLE(TLV320AIC23_ANLG, 2, 2, rec_src_text);

static const struct snd_kcontrol_new tlv320aic23_rec_src_mux_controls =
SOC_DAPM_ENUM("Input Select", rec_src_enum);

static const struct soc_enum tlv320aic23_rec_src =
    SOC_ENUM_SINGLE(TLV320AIC23_ANLG, 2, 2, rec_src_text);
static const struct soc_enum tlv320aic23_deemph =
    SOC_ENUM_SINGLE(TLV320AIC23_DIGT, 1, 4, deemph_text);

static const DECLARE_TLV_DB_SCALE(out_gain_tlv, -12100, 100, 0);
static const DECLARE_TLV_DB_SCALE(input_gain_tlv, -1725, 75, 0);
static const DECLARE_TLV_DB_SCALE(sidetone_vol_tlv, -1800, 300, 0);

static int snd_soc_tlv320aic23_put_volsw(struct snd_kcontrol *kcontrol,
    struct snd_ctl_elem_value *ucontrol)
{
    struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
    u16 val, reg;

    val = (ucontrol->value.integer.value[0] & 0x07);

    /* linear conversion to userspace
    * 000   =   -6db
    * 001   =   -9db
    * 010   =   -12db
    * 011   =   -18db (Min)
    * 100   =   0db (Max)
    */
    val = (val >= 4) ? 4  : (3 - val);

    reg = snd_soc_read(codec, TLV320AIC23_ANLG) & (~0x1C0);
    snd_soc_write(codec, TLV320AIC23_ANLG, reg | (val << 6));

    return 0;
}

static int snd_soc_tlv320aic23_get_volsw(struct snd_kcontrol *kcontrol,
    struct snd_ctl_elem_value *ucontrol)
{
    struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
    u16 val;

    val = snd_soc_read(codec, TLV320AIC23_ANLG) & (0x1C0);
    val = val >> 6;
    val = (val >= 4) ? 4  : (3 -  val);
    ucontrol->value.integer.value[0] = val;
    return 0;

}

static const struct snd_kcontrol_new tlv320aic23_snd_controls[] = {
    SOC_DOUBLE_R_TLV("Digital Playback Volume", TLV320AIC23_LCHNVOL,
             TLV320AIC23_RCHNVOL, 0, 127, 0, out_gain_tlv),
    SOC_SINGLE("Digital Playback Switch", TLV320AIC23_DIGT, 3, 1, 1),
    SOC_DOUBLE_R("Line Input Switch", TLV320AIC23_LINVOL,
             TLV320AIC23_RINVOL, 7, 1, 0),
    SOC_DOUBLE_R_TLV("Line Input Volume", TLV320AIC23_LINVOL,
             TLV320AIC23_RINVOL, 0, 31, 0, input_gain_tlv),
    SOC_SINGLE("Mic Input Switch", TLV320AIC23_ANLG, 1, 1, 1),
    SOC_SINGLE("Mic Booster Switch", TLV320AIC23_ANLG, 0, 1, 0),
    SOC_SINGLE_EXT_TLV("Sidetone Volume", TLV320AIC23_ANLG, 6, 4, 0,
               snd_soc_tlv320aic23_get_volsw,
               snd_soc_tlv320aic23_put_volsw, sidetone_vol_tlv),
    SOC_ENUM("Playback De-emphasis", tlv320aic23_deemph),
};

/* PGA Mixer controls for Line and Mic switch */
static const struct snd_kcontrol_new tlv320aic23_output_mixer_controls[] = {
    SOC_DAPM_SINGLE("Line Bypass Switch", TLV320AIC23_ANLG, 3, 1, 0),
    SOC_DAPM_SINGLE("Mic Sidetone Switch", TLV320AIC23_ANLG, 5, 1, 0),
    SOC_DAPM_SINGLE("Playback Switch", TLV320AIC23_ANLG, 4, 1, 0),
};

static const struct snd_soc_dapm_widget tlv320aic23_dapm_widgets[] = {
    SND_SOC_DAPM_DAC("DAC", "Playback", TLV320AIC23_PWR, 3, 1),
    SND_SOC_DAPM_ADC("ADC", "Capture", TLV320AIC23_PWR, 2, 1),
    SND_SOC_DAPM_MUX("Capture Source", SND_SOC_NOPM, 0, 0,
             &tlv320aic23_rec_src_mux_controls),
    SND_SOC_DAPM_MIXER("Output Mixer", TLV320AIC23_PWR, 4, 1,
               &tlv320aic23_output_mixer_controls[0],
               ARRAY_SIZE(tlv320aic23_output_mixer_controls)),
    SND_SOC_DAPM_PGA("Line Input", TLV320AIC23_PWR, 0, 1, NULL, 0),
    SND_SOC_DAPM_PGA("Mic Input", TLV320AIC23_PWR, 1, 1, NULL, 0),

    SND_SOC_DAPM_OUTPUT("LHPOUT"),
    SND_SOC_DAPM_OUTPUT("RHPOUT"),
    SND_SOC_DAPM_OUTPUT("LOUT"),
    SND_SOC_DAPM_OUTPUT("ROUT"),

    SND_SOC_DAPM_INPUT("LLINEIN"),
    SND_SOC_DAPM_INPUT("RLINEIN"),

    SND_SOC_DAPM_INPUT("MICIN"),
};

static const struct snd_soc_dapm_route tlv320aic23_intercon[] = {
    /* Output Mixer */
    {"Output Mixer", "Line Bypass Switch", "Line Input"},
    {"Output Mixer", "Playback Switch", "DAC"},
    {"Output Mixer", "Mic Sidetone Switch", "Mic Input"},

    /* Outputs */
    {"RHPOUT", NULL, "Output Mixer"},
    {"LHPOUT", NULL, "Output Mixer"},
    {"LOUT", NULL, "Output Mixer"},
    {"ROUT", NULL, "Output Mixer"},

    /* Inputs */
    {"Line Input", "NULL", "LLINEIN"},
    {"Line Input", "NULL", "RLINEIN"},

    {"Mic Input", "NULL", "MICIN"},

    /* input mux */
    {"Capture Source", "Line", "Line Input"},
    {"Capture Source", "Mic", "Mic Input"},
    {"ADC", NULL, "Capture Source"},

};

/* AIC23 driver data */
struct aic23 {
    enum snd_soc_control_type control_type;
    int mclk;
    int requested_adc;
    int requested_dac;
};

/*
 * Common Crystals used
 * 11.2896 Mhz /128 = *88.2k  /192 = 58.8k
 * 12.0000 Mhz /125 = *96k    /136 = 88.235K
 * 12.2880 Mhz /128 = *96k    /192 = 64k
 * 16.9344 Mhz /128 = 132.3k /192 = *88.2k
 * 18.4320 Mhz /128 = 144k   /192 = *96k
 */

/*
 * Normal BOSR 0-256/2 = 128, 1-384/2 = 192
 * USB BOSR 0-250/2 = 125, 1-272/2 = 136
 */
static const int bosr_usb_divisor_table[] = {
    128, 125, 192, 136
};
#define LOWER_GROUP ((1<<0) | (1<<1) | (1<<2) | (1<<3) | (1<<6) | (1<<7))
#define UPPER_GROUP ((1<<8) | (1<<9) | (1<<10) | (1<<11)        | (1<<15))
static const unsigned short sr_valid_mask[] = {
    LOWER_GROUP|UPPER_GROUP,    /* Normal, bosr - 0*/
    LOWER_GROUP,            /* Usb, bosr - 0*/
    LOWER_GROUP|UPPER_GROUP,    /* Normal, bosr - 1*/
    UPPER_GROUP,            /* Usb, bosr - 1*/
};
/*
 * Every divisor is a factor of 11*12
 */
#define SR_MULT (11*12)
#define A(x) (SR_MULT/x)
static const unsigned char sr_adc_mult_table[] = {
    A(2), A(2), A(12), A(12),  0, 0, A(3), A(1),
    A(2), A(2), A(11), A(11),  0, 0, 0, A(1)
};
static const unsigned char sr_dac_mult_table[] = {
    A(2), A(12), A(2), A(12),  0, 0, A(3), A(1),
    A(2), A(11), A(2), A(11),  0, 0, 0, A(1)
};

static unsigned get_score(int adc, int adc_l, int adc_h, int need_adc,
        int dac, int dac_l, int dac_h, int need_dac)
{
    if ((adc >= adc_l) && (adc <= adc_h) &&
            (dac >= dac_l) && (dac <= dac_h)) {
        int diff_adc = need_adc - adc;
        int diff_dac = need_dac - dac;
        return abs(diff_adc) + abs(diff_dac);
    }
    return UINT_MAX;
}

static int find_rate(int mclk, u32 need_adc, u32 need_dac)
{
    int i, j;
    int best_i = -1;
    int best_j = -1;
    int best_div = 0;
    unsigned best_score = UINT_MAX;
    int adc_l, adc_h, dac_l, dac_h;

    need_adc *= SR_MULT;
    need_dac *= SR_MULT;
    /*
     * rates given are +/- 1/32
     */
    adc_l = need_adc - (need_adc >> 5);
    adc_h = need_adc + (need_adc >> 5);
    dac_l = need_dac - (need_dac >> 5);
    dac_h = need_dac + (need_dac >> 5);
    for (i = 0; i < ARRAY_SIZE(bosr_usb_divisor_table); i++) {
        int base = mclk / bosr_usb_divisor_table[i];
        int mask = sr_valid_mask[i];
        for (j = 0; j < ARRAY_SIZE(sr_adc_mult_table);
                j++, mask >>= 1) {
            int adc;
            int dac;
            int score;
            if ((mask & 1) == 0)
                continue;
            adc = base * sr_adc_mult_table[j];
            dac = base * sr_dac_mult_table[j];
            score = get_score(adc, adc_l, adc_h, need_adc,
                    dac, dac_l, dac_h, need_dac);
            if (best_score > score) {
                best_score = score;
                best_i = i;
                best_j = j;
                best_div = 0;
            }
            score = get_score((adc >> 1), adc_l, adc_h, need_adc,
                    (dac >> 1), dac_l, dac_h, need_dac);
            /* prefer to have a /2 */
            if ((score != UINT_MAX) && (best_score >= score)) {
                best_score = score;
                best_i = i;
                best_j = j;
                best_div = 1;
            }
        }
    }
    return (best_j << 2) | best_i | (best_div << TLV320AIC23_CLKIN_SHIFT);
}

#ifdef DEBUG
static void get_current_sample_rates(struct snd_soc_codec *codec, int mclk,
        u32 *sample_rate_adc, u32 *sample_rate_dac)
{
    int src = snd_soc_read(codec, TLV320AIC23_SRATE);
    int sr = (src >> 2) & 0x0f;
    int val = (mclk / bosr_usb_divisor_table[src & 3]);
    int adc = (val * sr_adc_mult_table[sr]) / SR_MULT;
    int dac = (val * sr_dac_mult_table[sr]) / SR_MULT;
    if (src & TLV320AIC23_CLKIN_HALF) {
        adc >>= 1;
        dac >>= 1;
    }
    *sample_rate_adc = adc;
    *sample_rate_dac = dac;
}
#endif

static int set_sample_rate_control(struct snd_soc_codec *codec, int mclk,
        u32 sample_rate_adc, u32 sample_rate_dac)
{
    /* Search for the right sample rate */
    int data = find_rate(mclk, sample_rate_adc, sample_rate_dac);
    if (data < 0) {
        printk(KERN_ERR "%s:Invalid rate %u,%u requested\n",
                __func__, sample_rate_adc, sample_rate_dac);
        return -EINVAL;
    }
    snd_soc_write(codec, TLV320AIC23_SRATE, data);
#ifdef DEBUG
    {
        u32 adc, dac;
        get_current_sample_rates(codec, mclk, &adc, &dac);
        printk(KERN_DEBUG "actual samplerate = %u,%u reg=%x\n",
            adc, dac, data);
    }
#endif
    return 0;
}

static int tlv320aic23_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;
    u16 iface_reg;
    int ret;
    struct aic23 *aic23 = snd_soc_codec_get_drvdata(codec);
    u32 sample_rate_adc = aic23->requested_adc;
    u32 sample_rate_dac = aic23->requested_dac;
    u32 sample_rate = params_rate(params);

    if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
        aic23->requested_dac = sample_rate_dac = sample_rate;
        if (!sample_rate_adc)
            sample_rate_adc = sample_rate;
    } else {
        aic23->requested_adc = sample_rate_adc = sample_rate;
        if (!sample_rate_dac)
            sample_rate_dac = sample_rate;
    }
    ret = set_sample_rate_control(codec, aic23->mclk, sample_rate_adc,
            sample_rate_dac);
    if (ret < 0)
        return ret;

    iface_reg = snd_soc_read(codec, TLV320AIC23_DIGT_FMT) & ~(0x03 << 2);

    switch (params_format(params)) {
    case SNDRV_PCM_FORMAT_S16_LE:
        break;
    case SNDRV_PCM_FORMAT_S20_3LE:
        iface_reg |= (0x01 << 2);
        break;
    case SNDRV_PCM_FORMAT_S24_LE:
        iface_reg |= (0x02 << 2);
        break;
    case SNDRV_PCM_FORMAT_S32_LE:
        iface_reg |= (0x03 << 2);
        break;
    }
    snd_soc_write(codec, TLV320AIC23_DIGT_FMT, iface_reg);

    return 0;
}

static int tlv320aic23_pcm_prepare(struct snd_pcm_substream *substream,
                   struct snd_soc_dai *dai)
{
    struct snd_soc_codec *codec = dai->codec;

    /* set active */
    snd_soc_write(codec, TLV320AIC23_ACTIVE, 0x0001);

    return 0;
}

static void tlv320aic23_shutdown(struct snd_pcm_substream *substream,
                 struct snd_soc_dai *dai)
{
    struct snd_soc_codec *codec = dai->codec;
    struct aic23 *aic23 = snd_soc_codec_get_drvdata(codec);

    /* deactivate */
    if (!codec->active) {
        udelay(50);
        snd_soc_write(codec, TLV320AIC23_ACTIVE, 0x0);
    }
    if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
        aic23->requested_dac = 0;
    else
        aic23->requested_adc = 0;
}

static int tlv320aic23_mute(struct snd_soc_dai *dai, int mute)
{
    struct snd_soc_codec *codec = dai->codec;
    u16 reg;

    reg = snd_soc_read(codec, TLV320AIC23_DIGT);
    if (mute)
        reg |= TLV320AIC23_DACM_MUTE;

    else
        reg &= ~TLV320AIC23_DACM_MUTE;

    snd_soc_write(codec, TLV320AIC23_DIGT, reg);

    return 0;
}

static int tlv320aic23_set_dai_fmt(struct snd_soc_dai *codec_dai,
                   unsigned int fmt)
{
    struct snd_soc_codec *codec = codec_dai->codec;
    u16 iface_reg;

    iface_reg = snd_soc_read(codec, TLV320AIC23_DIGT_FMT) & (~0x03);

    /* set master/slave audio interface */
    switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
    case SND_SOC_DAIFMT_CBM_CFM:
        iface_reg |= TLV320AIC23_MS_MASTER;
        break;
    case SND_SOC_DAIFMT_CBS_CFS:
        iface_reg &= ~TLV320AIC23_MS_MASTER;
        break;
    default:
        return -EINVAL;

    }

    /* interface format */
    switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
    case SND_SOC_DAIFMT_I2S:
        iface_reg |= TLV320AIC23_FOR_I2S;
        break;
    case SND_SOC_DAIFMT_DSP_A:
        iface_reg |= TLV320AIC23_LRP_ON;
    case SND_SOC_DAIFMT_DSP_B:
        iface_reg |= TLV320AIC23_FOR_DSP;
        break;
    case SND_SOC_DAIFMT_RIGHT_J:
        break;
    case SND_SOC_DAIFMT_LEFT_J:
        iface_reg |= TLV320AIC23_FOR_LJUST;
        break;
    default:
        return -EINVAL;

    }

    snd_soc_write(codec, TLV320AIC23_DIGT_FMT, iface_reg);

    return 0;
}

static int tlv320aic23_set_dai_sysclk(struct snd_soc_dai *codec_dai,
                      int clk_id, unsigned int freq, int dir)
{
    struct aic23 *aic23 = snd_soc_dai_get_drvdata(codec_dai);
    aic23->mclk = freq;
    return 0;
}

static int tlv320aic23_set_bias_level(struct snd_soc_codec *codec,
                      enum snd_soc_bias_level level)
{
    u16 reg = snd_soc_read(codec, TLV320AIC23_PWR) & 0x17f;

    switch (level) {
    case SND_SOC_BIAS_ON:
        /* vref/mid, osc on, dac unmute */
        reg &= ~(TLV320AIC23_DEVICE_PWR_OFF | TLV320AIC23_OSC_OFF | \
            TLV320AIC23_DAC_OFF);
        snd_soc_write(codec, TLV320AIC23_PWR, reg);
        break;
    case SND_SOC_BIAS_PREPARE:
        break;
    case SND_SOC_BIAS_STANDBY:
        /* everything off except vref/vmid, */
        snd_soc_write(codec, TLV320AIC23_PWR,
                  reg | TLV320AIC23_CLK_OFF);
        break;
    case SND_SOC_BIAS_OFF:
        /* everything off, dac mute, inactive */
        snd_soc_write(codec, TLV320AIC23_ACTIVE, 0x0);
        snd_soc_write(codec, TLV320AIC23_PWR, 0x1ff);
        break;
    }
    codec->dapm.bias_level = level;
    return 0;
}

#define AIC23_RATES SNDRV_PCM_RATE_8000_96000
#define AIC23_FORMATS   (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE | \
             SNDRV_PCM_FMTBIT_S24_3LE | SNDRV_PCM_FMTBIT_S32_LE)

static const struct snd_soc_dai_ops tlv320aic23_dai_ops = {
    .prepare    = tlv320aic23_pcm_prepare,
    .hw_params  = tlv320aic23_hw_params,
    .shutdown   = tlv320aic23_shutdown,
    .digital_mute   = tlv320aic23_mute,
    .set_fmt    = tlv320aic23_set_dai_fmt,
    .set_sysclk = tlv320aic23_set_dai_sysclk,
};

static struct snd_soc_dai_driver tlv320aic23_dai = {
    .name = "tlv320aic23-hifi",
    .playback = {
             .stream_name = "Playback",
             .channels_min = 2,
             .channels_max = 2,
             .rates = AIC23_RATES,
             .formats = AIC23_FORMATS,},
    .capture = {
            .stream_name = "Capture",
            .channels_min = 2,
            .channels_max = 2,
            .rates = AIC23_RATES,
            .formats = AIC23_FORMATS,},
    .ops = &tlv320aic23_dai_ops,
};

static int tlv320aic23_suspend(struct snd_soc_codec *codec)
{
    tlv320aic23_set_bias_level(codec, SND_SOC_BIAS_OFF);

    return 0;
}

static int tlv320aic23_resume(struct snd_soc_codec *codec)
{
    snd_soc_cache_sync(codec);
    tlv320aic23_set_bias_level(codec, SND_SOC_BIAS_STANDBY);

    return 0;
}

static int tlv320aic23_probe(struct snd_soc_codec *codec)
{
    struct aic23 *aic23 = snd_soc_codec_get_drvdata(codec);
    int ret;

    ret = snd_soc_codec_set_cache_io(codec, 7, 9, aic23->control_type);
    if (ret < 0) {
        dev_err(codec->dev, "Failed to set cache I/O: %d\n", ret);
        return ret;
    }

    /* Reset codec */
    snd_soc_write(codec, TLV320AIC23_RESET, 0);

    /* Write the register default value to cache for reserved registers,
     * so the write to the these registers are suppressed by the cache
     * restore code when it skips writes of default registers.
     */
    snd_soc_cache_write(codec, 0x0A, 0);
    snd_soc_cache_write(codec, 0x0B, 0);
    snd_soc_cache_write(codec, 0x0C, 0);
    snd_soc_cache_write(codec, 0x0D, 0);
    snd_soc_cache_write(codec, 0x0E, 0);

    /* power on device */
    tlv320aic23_set_bias_level(codec, SND_SOC_BIAS_STANDBY);

    snd_soc_write(codec, TLV320AIC23_DIGT, TLV320AIC23_DEEMP_44K);

    /* Unmute input */
    snd_soc_update_bits(codec, TLV320AIC23_LINVOL,
                TLV320AIC23_LIM_MUTED, TLV320AIC23_LRS_ENABLED);

    snd_soc_update_bits(codec, TLV320AIC23_RINVOL,
                TLV320AIC23_LIM_MUTED, TLV320AIC23_LRS_ENABLED);

    snd_soc_update_bits(codec, TLV320AIC23_ANLG,
                TLV320AIC23_BYPASS_ON | TLV320AIC23_MICM_MUTED,
                0);

    /* Default output volume */
    snd_soc_write(codec, TLV320AIC23_LCHNVOL,
              TLV320AIC23_DEFAULT_OUT_VOL & TLV320AIC23_OUT_VOL_MASK);
    snd_soc_write(codec, TLV320AIC23_RCHNVOL,
              TLV320AIC23_DEFAULT_OUT_VOL & TLV320AIC23_OUT_VOL_MASK);

    snd_soc_write(codec, TLV320AIC23_ACTIVE, 0x1);

    snd_soc_add_codec_controls(codec, tlv320aic23_snd_controls,
                ARRAY_SIZE(tlv320aic23_snd_controls));

    return 0;
}

static int tlv320aic23_remove(struct snd_soc_codec *codec)
{
    tlv320aic23_set_bias_level(codec, SND_SOC_BIAS_OFF);
    return 0;
}

static struct snd_soc_codec_driver soc_codec_dev_tlv320aic23 = {
    .reg_cache_size = ARRAY_SIZE(tlv320aic23_reg),
    .reg_word_size = sizeof(u16),
    .reg_cache_default = tlv320aic23_reg,
    .probe = tlv320aic23_probe,
    .remove = tlv320aic23_remove,
    .suspend = tlv320aic23_suspend,
    .resume = tlv320aic23_resume,
    .set_bias_level = tlv320aic23_set_bias_level,
    .dapm_widgets = tlv320aic23_dapm_widgets,
    .num_dapm_widgets = ARRAY_SIZE(tlv320aic23_dapm_widgets),
    .dapm_routes = tlv320aic23_intercon,
    .num_dapm_routes = ARRAY_SIZE(tlv320aic23_intercon),
};

#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
/*
 * If the i2c layer weren't so broken, we could pass this kind of data
 * around
 */
static int tlv320aic23_codec_probe(struct i2c_client *i2c,
                   const struct i2c_device_id *i2c_id)
{
    struct aic23 *aic23;
    int ret;

    if (!i2c_check_functionality(i2c->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
        return -EINVAL;

    aic23 = devm_kzalloc(&i2c->dev, sizeof(struct aic23), GFP_KERNEL);
    if (aic23 == NULL)
        return -ENOMEM;

    i2c_set_clientdata(i2c, aic23);
    aic23->control_type = SND_SOC_I2C;

    ret =  snd_soc_register_codec(&i2c->dev,
            &soc_codec_dev_tlv320aic23, &tlv320aic23_dai, 1);
    return ret;
}
static int __exit tlv320aic23_i2c_remove(struct i2c_client *i2c)
{
    snd_soc_unregister_codec(&i2c->dev);
    return 0;
}

static const struct i2c_device_id tlv320aic23_id[] = {
    {"tlv320aic23", 0},
    {}
};

MODULE_DEVICE_TABLE(i2c, tlv320aic23_id);

static struct i2c_driver tlv320aic23_i2c_driver = {
    .driver = {
           .name = "tlv320aic23-codec",
           },
    .probe = tlv320aic23_codec_probe,
    .remove = __exit_p(tlv320aic23_i2c_remove),
    .id_table = tlv320aic23_id,
};

#endif

static int __init tlv320aic23_modinit(void)
{
    int ret;
#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
    ret = i2c_add_driver(&tlv320aic23_i2c_driver);
    if (ret != 0) {
        printk(KERN_ERR "Failed to register TLV320AIC23 I2C driver: %d\n",
               ret);
    }
#endif
    return ret;
}
module_init(tlv320aic23_modinit);

static void __exit tlv320aic23_exit(void)
{
#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
    i2c_del_driver(&tlv320aic23_i2c_driver);
#endif
}
module_exit(tlv320aic23_exit);

MODULE_DESCRIPTION("ASoC TLV320AIC23 codec driver");
MODULE_AUTHOR("Arun KS <[email protected]>");
MODULE_LICENSE("GPL");