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tlv320aic23.c

/*
 * ALSA SoC TLV320AIC23 codec driver
 *
 * Author:      Arun KS, <arunks@mistralsolutions.com>
 * 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/platform_device.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/soc-dapm.h>
#include <sound/tlv.h>
#include <sound/initval.h>

#include "tlv320aic23.h"

#define AIC23_VERSION "0.1"

struct tlv320aic23_srate_reg_info {
      u32 sample_rate;
      u8 control;       /* SR3, SR2, SR1, SR0 and BOSR */
      u8 divider;       /* if 0 CLKIN = MCLK, if 1 CLKIN = MCLK/2 */
};

/*
 * 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 */
};

/*
 * read tlv320aic23 register cache
 */
static inline unsigned int tlv320aic23_read_reg_cache(struct snd_soc_codec
                                          *codec, unsigned int reg)
{
      u16 *cache = codec->reg_cache;
      if (reg >= ARRAY_SIZE(tlv320aic23_reg))
            return -1;
      return cache[reg];
}

/*
 * write tlv320aic23 register cache
 */
static inline void tlv320aic23_write_reg_cache(struct snd_soc_codec *codec,
                                     u8 reg, u16 value)
{
      u16 *cache = codec->reg_cache;
      if (reg >= ARRAY_SIZE(tlv320aic23_reg))
            return;
      cache[reg] = value;
}

/*
 * write to the tlv320aic23 register space
 */
static int tlv320aic23_write(struct snd_soc_codec *codec, unsigned int reg,
                       unsigned int value)
{

      u8 data[2];

      /* TLV320AIC23 has 7 bit address and 9 bits of data
       * so we need to switch one data bit into reg and rest
       * of data into val
       */

      if ((reg < 0 || reg > 9) && (reg != 15)) {
            printk(KERN_WARNING "%s Invalid register R%d\n", __func__, reg);
            return -1;
      }

      data[0] = (reg << 1) | (value >> 8 & 0x01);
      data[1] = value & 0xff;

      tlv320aic23_write_reg_cache(codec, reg, value);

      if (codec->hw_write(codec->control_data, data, 2) == 2)
            return 0;

      printk(KERN_ERR "%s cannot write %03x to register R%d\n", __func__,
             value, reg);

      return -EIO;
}

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 = tlv320aic23_read_reg_cache(codec, TLV320AIC23_ANLG) & (~0x1C0);
      tlv320aic23_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 = tlv320aic23_read_reg_cache(codec, TLV320AIC23_ANLG) & (0x1C0);
      val = val >> 6;
      val = (val >= 4) ? 4  : (3 -  val);
      ucontrol->value.integer.value[0] = val;
      return 0;

}

#define SOC_TLV320AIC23_SINGLE_TLV(xname, reg, shift, max, invert, tlv_array) \
{     .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, \
      .access = SNDRV_CTL_ELEM_ACCESS_TLV_READ |\
             SNDRV_CTL_ELEM_ACCESS_READWRITE,\
      .tlv.p = (tlv_array), \
      .info = snd_soc_info_volsw, .get = snd_soc_tlv320aic23_get_volsw,\
      .put = snd_soc_tlv320aic23_put_volsw, \
      .private_value =  SOC_SINGLE_VALUE(reg, shift, max, invert) }

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_TLV320AIC23_SINGLE_TLV("Sidetone Volume", TLV320AIC23_ANLG,
                          6, 4, 0, sidetone_vol_tlv),
      SOC_ENUM("Playback De-emphasis", tlv320aic23_deemph),
};

/* add non dapm controls */
static int tlv320aic23_add_controls(struct snd_soc_codec *codec)
{

      int err, i;

      for (i = 0; i < ARRAY_SIZE(tlv320aic23_snd_controls); i++) {
            err = snd_ctl_add(codec->card,
                          snd_soc_cnew(&tlv320aic23_snd_controls[i],
                                     codec, NULL));
            if (err < 0)
                  return err;
      }

      return 0;

}

/* 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 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"},

};

/* tlv320aic23 related */
static const struct tlv320aic23_srate_reg_info srate_reg_info[] = {
      {4000, 0x06, 1},  /*  4000 */
      {8000, 0x06, 0},  /*  8000 */
      {16000, 0x0C, 1}, /* 16000 */
      {22050, 0x11, 1}, /* 22050 */
      {24000, 0x00, 1}, /* 24000 */
      {32000, 0x0C, 0}, /* 32000 */
      {44100, 0x11, 0}, /* 44100 */
      {48000, 0x00, 0}, /* 48000 */
      {88200, 0x1F, 0}, /* 88200 */
      {96000, 0x0E, 0}, /* 96000 */
};

static int tlv320aic23_add_widgets(struct snd_soc_codec *codec)
{
      snd_soc_dapm_new_controls(codec, tlv320aic23_dapm_widgets,
                          ARRAY_SIZE(tlv320aic23_dapm_widgets));

      /* set up audio path interconnects */
      snd_soc_dapm_add_routes(codec, intercon, ARRAY_SIZE(intercon));

      snd_soc_dapm_new_widgets(codec);
      return 0;
}

static int tlv320aic23_hw_params(struct snd_pcm_substream *substream,
                         struct snd_pcm_hw_params *params)
{
      struct snd_soc_pcm_runtime *rtd = substream->private_data;
      struct snd_soc_device *socdev = rtd->socdev;
      struct snd_soc_codec *codec = socdev->codec;
      u16 iface_reg, data;
      u8 count = 0;

      iface_reg =
          tlv320aic23_read_reg_cache(codec,
                               TLV320AIC23_DIGT_FMT) & ~(0x03 << 2);

      /* Search for the right sample rate */
      /* Verify what happens if the rate is not supported
       * now it goes to 96Khz */
      while ((srate_reg_info[count].sample_rate != params_rate(params)) &&
             (count < ARRAY_SIZE(srate_reg_info))) {
            count++;
      }

      data =  (srate_reg_info[count].divider << TLV320AIC23_CLKIN_SHIFT) |
            (srate_reg_info[count]. control << TLV320AIC23_BOSR_SHIFT) |
            TLV320AIC23_USB_CLK_ON;

      tlv320aic23_write(codec, TLV320AIC23_SRATE, data);

      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;
      }
      tlv320aic23_write(codec, TLV320AIC23_DIGT_FMT, iface_reg);

      return 0;
}

static int tlv320aic23_pcm_prepare(struct snd_pcm_substream *substream)
{
      struct snd_soc_pcm_runtime *rtd = substream->private_data;
      struct snd_soc_device *socdev = rtd->socdev;
      struct snd_soc_codec *codec = socdev->codec;

      /* set active */
      tlv320aic23_write(codec, TLV320AIC23_ACTIVE, 0x0001);

      return 0;
}

static void tlv320aic23_shutdown(struct snd_pcm_substream *substream)
{
      struct snd_soc_pcm_runtime *rtd = substream->private_data;
      struct snd_soc_device *socdev = rtd->socdev;
      struct snd_soc_codec *codec = socdev->codec;

      /* deactivate */
      if (!codec->active) {
            udelay(50);
            tlv320aic23_write(codec, TLV320AIC23_ACTIVE, 0x0);
      }
}

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

      reg = tlv320aic23_read_reg_cache(codec, TLV320AIC23_DIGT);
      if (mute)
            reg |= TLV320AIC23_DACM_MUTE;

      else
            reg &= ~TLV320AIC23_DACM_MUTE;

      tlv320aic23_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 =
          tlv320aic23_read_reg_cache(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:
            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_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;

      }

      tlv320aic23_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 snd_soc_codec *codec = codec_dai->codec;

      switch (freq) {
      case 12000000:
            return 0;
      }
      return -EINVAL;
}

static int tlv320aic23_set_bias_level(struct snd_soc_codec *codec,
                              enum snd_soc_bias_level level)
{
      u16 reg = tlv320aic23_read_reg_cache(codec, TLV320AIC23_PWR) & 0xff7f;

      switch (level) {
      case SND_SOC_BIAS_ON:
            /* vref/mid, osc on, dac unmute */
            tlv320aic23_write(codec, TLV320AIC23_PWR, reg);
            break;
      case SND_SOC_BIAS_PREPARE:
            break;
      case SND_SOC_BIAS_STANDBY:
            /* everything off except vref/vmid, */
            tlv320aic23_write(codec, TLV320AIC23_PWR, reg | 0x0040);
            break;
      case SND_SOC_BIAS_OFF:
            /* everything off, dac mute, inactive */
            tlv320aic23_write(codec, TLV320AIC23_ACTIVE, 0x0);
            tlv320aic23_write(codec, TLV320AIC23_PWR, 0xffff);
            break;
      }
      codec->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)

struct snd_soc_dai tlv320aic23_dai = {
      .name = "tlv320aic23",
      .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 = {
            .prepare = tlv320aic23_pcm_prepare,
            .hw_params = tlv320aic23_hw_params,
            .shutdown = tlv320aic23_shutdown,
            },
      .dai_ops = {
                .digital_mute = tlv320aic23_mute,
                .set_fmt = tlv320aic23_set_dai_fmt,
                .set_sysclk = tlv320aic23_set_dai_sysclk,
                }
};
EXPORT_SYMBOL_GPL(tlv320aic23_dai);

static int tlv320aic23_suspend(struct platform_device *pdev,
                         pm_message_t state)
{
      struct snd_soc_device *socdev = platform_get_drvdata(pdev);
      struct snd_soc_codec *codec = socdev->codec;

      tlv320aic23_write(codec, TLV320AIC23_ACTIVE, 0x0);
      tlv320aic23_set_bias_level(codec, SND_SOC_BIAS_OFF);

      return 0;
}

static int tlv320aic23_resume(struct platform_device *pdev)
{
      struct snd_soc_device *socdev = platform_get_drvdata(pdev);
      struct snd_soc_codec *codec = socdev->codec;
      int i;
      u16 reg;

      /* Sync reg_cache with the hardware */
      for (reg = 0; reg < ARRAY_SIZE(tlv320aic23_reg); i++) {
            u16 val = tlv320aic23_read_reg_cache(codec, reg);
            tlv320aic23_write(codec, reg, val);
      }

      tlv320aic23_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
      tlv320aic23_set_bias_level(codec, codec->suspend_bias_level);

      return 0;
}

/*
 * initialise the AIC23 driver
 * register the mixer and dsp interfaces with the kernel
 */
static int tlv320aic23_init(struct snd_soc_device *socdev)
{
      struct snd_soc_codec *codec = socdev->codec;
      int ret = 0;
      u16 reg;

      codec->name = "tlv320aic23";
      codec->owner = THIS_MODULE;
      codec->read = tlv320aic23_read_reg_cache;
      codec->write = tlv320aic23_write;
      codec->set_bias_level = tlv320aic23_set_bias_level;
      codec->dai = &tlv320aic23_dai;
      codec->num_dai = 1;
      codec->reg_cache_size = ARRAY_SIZE(tlv320aic23_reg);
      codec->reg_cache =
          kmemdup(tlv320aic23_reg, sizeof(tlv320aic23_reg), GFP_KERNEL);
      if (codec->reg_cache == NULL)
            return -ENOMEM;

      /* Reset codec */
      tlv320aic23_write(codec, TLV320AIC23_RESET, 0);

      /* register pcms */
      ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
      if (ret < 0) {
            printk(KERN_ERR "tlv320aic23: failed to create pcms\n");
            goto pcm_err;
      }

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

      tlv320aic23_write(codec, TLV320AIC23_DIGT, TLV320AIC23_DEEMP_44K);

      /* Unmute input */
      reg = tlv320aic23_read_reg_cache(codec, TLV320AIC23_LINVOL);
      tlv320aic23_write(codec, TLV320AIC23_LINVOL,
                    (reg & (~TLV320AIC23_LIM_MUTED)) |
                    (TLV320AIC23_LRS_ENABLED));

      reg = tlv320aic23_read_reg_cache(codec, TLV320AIC23_RINVOL);
      tlv320aic23_write(codec, TLV320AIC23_RINVOL,
                    (reg & (~TLV320AIC23_LIM_MUTED)) |
                    TLV320AIC23_LRS_ENABLED);

      reg = tlv320aic23_read_reg_cache(codec, TLV320AIC23_ANLG);
      tlv320aic23_write(codec, TLV320AIC23_ANLG,
                   (reg) & (~TLV320AIC23_BYPASS_ON) &
                   (~TLV320AIC23_MICM_MUTED));

      /* Default output volume */
      tlv320aic23_write(codec, TLV320AIC23_LCHNVOL,
                    TLV320AIC23_DEFAULT_OUT_VOL &
                    TLV320AIC23_OUT_VOL_MASK);
      tlv320aic23_write(codec, TLV320AIC23_RCHNVOL,
                    TLV320AIC23_DEFAULT_OUT_VOL &
                    TLV320AIC23_OUT_VOL_MASK);

      tlv320aic23_write(codec, TLV320AIC23_ACTIVE, 0x1);

      tlv320aic23_add_controls(codec);
      tlv320aic23_add_widgets(codec);
      ret = snd_soc_register_card(socdev);
      if (ret < 0) {
            printk(KERN_ERR "tlv320aic23: failed to register card\n");
            goto card_err;
      }

      return ret;

card_err:
      snd_soc_free_pcms(socdev);
      snd_soc_dapm_free(socdev);
pcm_err:
      kfree(codec->reg_cache);
      return ret;
}
static struct snd_soc_device *tlv320aic23_socdev;

#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 snd_soc_device *socdev = tlv320aic23_socdev;
      struct snd_soc_codec *codec = socdev->codec;
      int ret;

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

      i2c_set_clientdata(i2c, codec);
      codec->control_data = i2c;

      ret = tlv320aic23_init(socdev);
      if (ret < 0) {
            printk(KERN_ERR "tlv320aic23: failed to initialise AIC23\n");
            goto err;
      }
      return ret;

err:
      kfree(codec);
      kfree(i2c);
      return ret;
}
static int __exit tlv320aic23_i2c_remove(struct i2c_client *i2c)
{
      put_device(&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",
               },
      .probe = tlv320aic23_codec_probe,
      .remove = __exit_p(tlv320aic23_i2c_remove),
      .id_table = tlv320aic23_id,
};

#endif

static int tlv320aic23_probe(struct platform_device *pdev)
{
      struct snd_soc_device *socdev = platform_get_drvdata(pdev);
      struct snd_soc_codec *codec;
      int ret = 0;

      printk(KERN_INFO "AIC23 Audio Codec %s\n", AIC23_VERSION);

      codec = kzalloc(sizeof(struct snd_soc_codec), GFP_KERNEL);
      if (codec == NULL)
            return -ENOMEM;

      socdev->codec = codec;
      mutex_init(&codec->mutex);
      INIT_LIST_HEAD(&codec->dapm_widgets);
      INIT_LIST_HEAD(&codec->dapm_paths);

      tlv320aic23_socdev = socdev;
#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
      codec->hw_write = (hw_write_t) i2c_master_send;
      codec->hw_read = NULL;
      ret = i2c_add_driver(&tlv320aic23_i2c_driver);
      if (ret != 0)
            printk(KERN_ERR "can't add i2c driver");
#endif
      return ret;
}

static int tlv320aic23_remove(struct platform_device *pdev)
{
      struct snd_soc_device *socdev = platform_get_drvdata(pdev);
      struct snd_soc_codec *codec = socdev->codec;

      if (codec->control_data)
            tlv320aic23_set_bias_level(codec, SND_SOC_BIAS_OFF);

      snd_soc_free_pcms(socdev);
      snd_soc_dapm_free(socdev);
#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
      i2c_del_driver(&tlv320aic23_i2c_driver);
#endif
      kfree(codec->reg_cache);
      kfree(codec);

      return 0;
}
struct snd_soc_codec_device soc_codec_dev_tlv320aic23 = {
      .probe = tlv320aic23_probe,
      .remove = tlv320aic23_remove,
      .suspend = tlv320aic23_suspend,
      .resume = tlv320aic23_resume,
};
EXPORT_SYMBOL_GPL(soc_codec_dev_tlv320aic23);

MODULE_DESCRIPTION("ASoC TLV320AIC23 codec driver");
MODULE_AUTHOR("Arun KS <arunks@mistralsolutions.com>");
MODULE_LICENSE("GPL");

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