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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 <linux/slab.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"

/*
 * 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 > 9 && reg != 15) {
            printk(KERN_WARNING "%s Invalid register R%u\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%u\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),
};

/* 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"},

};

/* AIC23 driver data */
struct aic23 {
      struct snd_soc_codec codec;
      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 = tlv320aic23_read_reg_cache(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;
      }
      tlv320aic23_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_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));

      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_pcm_runtime *rtd = substream->private_data;
      struct snd_soc_device *socdev = rtd->socdev;
      struct snd_soc_codec *codec = socdev->card->codec;
      u16 iface_reg;
      int ret;
      struct aic23 *aic23 = container_of(codec, struct aic23, 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 =
          tlv320aic23_read_reg_cache(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;
      }
      tlv320aic23_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_pcm_runtime *rtd = substream->private_data;
      struct snd_soc_device *socdev = rtd->socdev;
      struct snd_soc_codec *codec = socdev->card->codec;

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

      return 0;
}

static void tlv320aic23_shutdown(struct snd_pcm_substream *substream,
                         struct snd_soc_dai *dai)
{
      struct snd_soc_pcm_runtime *rtd = substream->private_data;
      struct snd_soc_device *socdev = rtd->socdev;
      struct snd_soc_codec *codec = socdev->card->codec;
      struct aic23 *aic23 = container_of(codec, struct aic23, codec);

      /* deactivate */
      if (!codec->active) {
            udelay(50);
            tlv320aic23_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 = 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_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;

      }

      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;
      struct aic23 *aic23 = container_of(codec, struct aic23, codec);
      aic23->mclk = freq;
      return 0;
}

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)

static 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,
};

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 = &tlv320aic23_dai_ops,
};
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->card->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->card->codec;
      u16 reg;

      /* Sync reg_cache with the hardware */
      for (reg = 0; reg <= TLV320AIC23_ACTIVE; reg++) {
            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->card->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);

      snd_soc_add_controls(codec, tlv320aic23_snd_controls,
                        ARRAY_SIZE(tlv320aic23_snd_controls));
      tlv320aic23_add_widgets(codec);

      return ret;

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->card->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;
      struct aic23 *aic23;
      int ret = 0;

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

      aic23 = kzalloc(sizeof(struct aic23), GFP_KERNEL);
      if (aic23 == NULL)
            return -ENOMEM;
      codec = &aic23->codec;
      socdev->card->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->card->codec;
      struct aic23 *aic23 = container_of(codec, struct aic23, 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(aic23);

      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);

static int __init tlv320aic23_modinit(void)
{
      return snd_soc_register_dai(&tlv320aic23_dai);
}
module_init(tlv320aic23_modinit);

static void __exit tlv320aic23_exit(void)
{
      snd_soc_unregister_dai(&tlv320aic23_dai);
}
module_exit(tlv320aic23_exit);

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

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