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cs42l51.c

/*
 * cs42l51.c
 *
 * ASoC Driver for Cirrus Logic CS42L51 codecs
 *
 * Copyright (c) 2010 Arnaud Patard <apatard@mandriva.com>
 *
 * Based on cs4270.c - Copyright (c) Freescale Semiconductor
 *
 * 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.
 *
 * 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.
 *
 * For now:
 *  - Only I2C is support. Not SPI
 *  - master mode *NOT* supported
 */

#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <sound/core.h>
#include <sound/soc.h>
#include <sound/tlv.h>
#include <sound/initval.h>
#include <sound/pcm_params.h>
#include <sound/pcm.h>
#include <linux/i2c.h>

#include "cs42l51.h"

enum master_slave_mode {
      MODE_SLAVE,
      MODE_SLAVE_AUTO,
      MODE_MASTER,
};

00043 struct cs42l51_private {
      enum snd_soc_control_type control_type;
      void *control_data;
      unsigned int mclk;
      unsigned int audio_mode;      /* The mode (I2S or left-justified) */
      enum master_slave_mode func;
};

#define CS42L51_FORMATS ( \
            SNDRV_PCM_FMTBIT_S16_LE  | SNDRV_PCM_FMTBIT_S16_BE  | \
            SNDRV_PCM_FMTBIT_S18_3LE | SNDRV_PCM_FMTBIT_S18_3BE | \
            SNDRV_PCM_FMTBIT_S20_3LE | SNDRV_PCM_FMTBIT_S20_3BE | \
            SNDRV_PCM_FMTBIT_S24_LE  | SNDRV_PCM_FMTBIT_S24_BE)

static int cs42l51_fill_cache(struct snd_soc_codec *codec)
{
      u8 *cache = codec->reg_cache + 1;
      struct i2c_client *i2c_client = codec->control_data;
      s32 length;

      length = i2c_smbus_read_i2c_block_data(i2c_client,
                  CS42L51_FIRSTREG | 0x80, CS42L51_NUMREGS, cache);
      if (length != CS42L51_NUMREGS) {
            dev_err(&i2c_client->dev,
                        "I2C read failure, addr=0x%x (ret=%d vs %d)\n",
                        i2c_client->addr, length, CS42L51_NUMREGS);
            return -EIO;
      }

      return 0;
}

static int cs42l51_get_chan_mix(struct snd_kcontrol *kcontrol,
                  struct snd_ctl_elem_value *ucontrol)
{
      struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
      unsigned long value = snd_soc_read(codec, CS42L51_PCM_MIXER)&3;

      switch (value) {
      default:
      case 0:
            ucontrol->value.integer.value[0] = 0;
            break;
      /* same value : (L+R)/2 and (R+L)/2 */
      case 1:
      case 2:
            ucontrol->value.integer.value[0] = 1;
            break;
      case 3:
            ucontrol->value.integer.value[0] = 2;
            break;
      }

      return 0;
}

#define CHAN_MIX_NORMAL 0x00
#define CHAN_MIX_BOTH   0x55
#define CHAN_MIX_SWAP   0xFF

static int cs42l51_set_chan_mix(struct snd_kcontrol *kcontrol,
                  struct snd_ctl_elem_value *ucontrol)
{
      struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
      unsigned char val;

      switch (ucontrol->value.integer.value[0]) {
      default:
      case 0:
            val = CHAN_MIX_NORMAL;
            break;
      case 1:
            val = CHAN_MIX_BOTH;
            break;
      case 2:
            val = CHAN_MIX_SWAP;
            break;
      }

      snd_soc_write(codec, CS42L51_PCM_MIXER, val);

      return 1;
}

static const DECLARE_TLV_DB_SCALE(adc_pcm_tlv, -5150, 50, 0);
static const DECLARE_TLV_DB_SCALE(tone_tlv, -1050, 150, 0);
/* This is a lie. after -102 db, it stays at -102 */
/* maybe a range would be better */
static const DECLARE_TLV_DB_SCALE(aout_tlv, -11550, 50, 0);

static const DECLARE_TLV_DB_SCALE(boost_tlv, 1600, 1600, 0);
static const char *chan_mix[] = {
      "L R",
      "L+R",
      "R L",
};

static const struct soc_enum cs42l51_chan_mix =
      SOC_ENUM_SINGLE_EXT(ARRAY_SIZE(chan_mix), chan_mix);

static const struct snd_kcontrol_new cs42l51_snd_controls[] = {
      SOC_DOUBLE_R_SX_TLV("PCM Playback Volume",
                  CS42L51_PCMA_VOL, CS42L51_PCMB_VOL,
                  7, 0xffffff99, 0x18, adc_pcm_tlv),
      SOC_DOUBLE_R("PCM Playback Switch",
                  CS42L51_PCMA_VOL, CS42L51_PCMB_VOL, 7, 1, 1),
      SOC_DOUBLE_R_SX_TLV("Analog Playback Volume",
                  CS42L51_AOUTA_VOL, CS42L51_AOUTB_VOL,
                  8, 0xffffff19, 0x18, aout_tlv),
      SOC_DOUBLE_R_SX_TLV("ADC Mixer Volume",
                  CS42L51_ADCA_VOL, CS42L51_ADCB_VOL,
                  7, 0xffffff99, 0x18, adc_pcm_tlv),
      SOC_DOUBLE_R("ADC Mixer Switch",
                  CS42L51_ADCA_VOL, CS42L51_ADCB_VOL, 7, 1, 1),
      SOC_SINGLE("Playback Deemphasis Switch", CS42L51_DAC_CTL, 3, 1, 0),
      SOC_SINGLE("Auto-Mute Switch", CS42L51_DAC_CTL, 2, 1, 0),
      SOC_SINGLE("Soft Ramp Switch", CS42L51_DAC_CTL, 1, 1, 0),
      SOC_SINGLE("Zero Cross Switch", CS42L51_DAC_CTL, 0, 0, 0),
      SOC_DOUBLE_TLV("Mic Boost Volume",
                  CS42L51_MIC_CTL, 0, 1, 1, 0, boost_tlv),
      SOC_SINGLE_TLV("Bass Volume", CS42L51_TONE_CTL, 0, 0xf, 1, tone_tlv),
      SOC_SINGLE_TLV("Treble Volume", CS42L51_TONE_CTL, 4, 0xf, 1, tone_tlv),
      SOC_ENUM_EXT("PCM channel mixer",
                  cs42l51_chan_mix,
                  cs42l51_get_chan_mix, cs42l51_set_chan_mix),
};

/*
 * to power down, one must:
 * 1.) Enable the PDN bit
 * 2.) enable power-down for the select channels
 * 3.) disable the PDN bit.
 */
static int cs42l51_pdn_event(struct snd_soc_dapm_widget *w,
            struct snd_kcontrol *kcontrol, int event)
{
      unsigned long value;

      value = snd_soc_read(w->codec, CS42L51_POWER_CTL1);
      value &= ~CS42L51_POWER_CTL1_PDN;

      switch (event) {
      case SND_SOC_DAPM_PRE_PMD:
            value |= CS42L51_POWER_CTL1_PDN;
            break;
      default:
      case SND_SOC_DAPM_POST_PMD:
            break;
      }
      snd_soc_update_bits(w->codec, CS42L51_POWER_CTL1,
            CS42L51_POWER_CTL1_PDN, value);

      return 0;
}

static const char *cs42l51_dac_names[] = {"Direct PCM",
      "DSP PCM", "ADC"};
static const struct soc_enum cs42l51_dac_mux_enum =
      SOC_ENUM_SINGLE(CS42L51_DAC_CTL, 6, 3, cs42l51_dac_names);
static const struct snd_kcontrol_new cs42l51_dac_mux_controls =
      SOC_DAPM_ENUM("Route", cs42l51_dac_mux_enum);

static const char *cs42l51_adcl_names[] = {"AIN1 Left", "AIN2 Left",
      "MIC Left", "MIC+preamp Left"};
static const struct soc_enum cs42l51_adcl_mux_enum =
      SOC_ENUM_SINGLE(CS42L51_ADC_INPUT, 4, 4, cs42l51_adcl_names);
static const struct snd_kcontrol_new cs42l51_adcl_mux_controls =
      SOC_DAPM_ENUM("Route", cs42l51_adcl_mux_enum);

static const char *cs42l51_adcr_names[] = {"AIN1 Right", "AIN2 Right",
      "MIC Right", "MIC+preamp Right"};
static const struct soc_enum cs42l51_adcr_mux_enum =
      SOC_ENUM_SINGLE(CS42L51_ADC_INPUT, 6, 4, cs42l51_adcr_names);
static const struct snd_kcontrol_new cs42l51_adcr_mux_controls =
      SOC_DAPM_ENUM("Route", cs42l51_adcr_mux_enum);

static const struct snd_soc_dapm_widget cs42l51_dapm_widgets[] = {
      SND_SOC_DAPM_MICBIAS("Mic Bias", CS42L51_MIC_POWER_CTL, 1, 1),
      SND_SOC_DAPM_PGA_E("Left PGA", CS42L51_POWER_CTL1, 3, 1, NULL, 0,
            cs42l51_pdn_event, SND_SOC_DAPM_PRE_POST_PMD),
      SND_SOC_DAPM_PGA_E("Right PGA", CS42L51_POWER_CTL1, 4, 1, NULL, 0,
            cs42l51_pdn_event, SND_SOC_DAPM_PRE_POST_PMD),
      SND_SOC_DAPM_ADC_E("Left ADC", "Left HiFi Capture",
            CS42L51_POWER_CTL1, 1, 1,
            cs42l51_pdn_event, SND_SOC_DAPM_PRE_POST_PMD),
      SND_SOC_DAPM_ADC_E("Right ADC", "Right HiFi Capture",
            CS42L51_POWER_CTL1, 2, 1,
            cs42l51_pdn_event, SND_SOC_DAPM_PRE_POST_PMD),
      SND_SOC_DAPM_DAC_E("Left DAC", "Left HiFi Playback",
            CS42L51_POWER_CTL1, 5, 1,
            cs42l51_pdn_event, SND_SOC_DAPM_PRE_POST_PMD),
      SND_SOC_DAPM_DAC_E("Right DAC", "Right HiFi Playback",
            CS42L51_POWER_CTL1, 6, 1,
            cs42l51_pdn_event, SND_SOC_DAPM_PRE_POST_PMD),

      /* analog/mic */
      SND_SOC_DAPM_INPUT("AIN1L"),
      SND_SOC_DAPM_INPUT("AIN1R"),
      SND_SOC_DAPM_INPUT("AIN2L"),
      SND_SOC_DAPM_INPUT("AIN2R"),
      SND_SOC_DAPM_INPUT("MICL"),
      SND_SOC_DAPM_INPUT("MICR"),

      SND_SOC_DAPM_MIXER("Mic Preamp Left",
            CS42L51_MIC_POWER_CTL, 2, 1, NULL, 0),
      SND_SOC_DAPM_MIXER("Mic Preamp Right",
            CS42L51_MIC_POWER_CTL, 3, 1, NULL, 0),

      /* HP */
      SND_SOC_DAPM_OUTPUT("HPL"),
      SND_SOC_DAPM_OUTPUT("HPR"),

      /* mux */
      SND_SOC_DAPM_MUX("DAC Mux", SND_SOC_NOPM, 0, 0,
            &cs42l51_dac_mux_controls),
      SND_SOC_DAPM_MUX("PGA-ADC Mux Left", SND_SOC_NOPM, 0, 0,
            &cs42l51_adcl_mux_controls),
      SND_SOC_DAPM_MUX("PGA-ADC Mux Right", SND_SOC_NOPM, 0, 0,
            &cs42l51_adcr_mux_controls),
};

static const struct snd_soc_dapm_route cs42l51_routes[] = {
      {"HPL", NULL, "Left DAC"},
      {"HPR", NULL, "Right DAC"},

      {"Left ADC", NULL, "Left PGA"},
      {"Right ADC", NULL, "Right PGA"},

      {"Mic Preamp Left",  NULL,  "MICL"},
      {"Mic Preamp Right", NULL,  "MICR"},

      {"PGA-ADC Mux Left",  "AIN1 Left",        "AIN1L" },
      {"PGA-ADC Mux Left",  "AIN2 Left",        "AIN2L" },
      {"PGA-ADC Mux Left",  "MIC Left",         "MICL"  },
      {"PGA-ADC Mux Left",  "MIC+preamp Left",  "Mic Preamp Left" },
      {"PGA-ADC Mux Right", "AIN1 Right",       "AIN1R" },
      {"PGA-ADC Mux Right", "AIN2 Right",       "AIN2R" },
      {"PGA-ADC Mux Right", "MIC Right",        "MICR" },
      {"PGA-ADC Mux Right", "MIC+preamp Right", "Mic Preamp Right" },

      {"Left PGA", NULL, "PGA-ADC Mux Left"},
      {"Right PGA", NULL, "PGA-ADC Mux Right"},
};

static int cs42l51_set_dai_fmt(struct snd_soc_dai *codec_dai,
            unsigned int format)
{
      struct snd_soc_codec *codec = codec_dai->codec;
      struct cs42l51_private *cs42l51 = snd_soc_codec_get_drvdata(codec);
      int ret = 0;

      switch (format & SND_SOC_DAIFMT_FORMAT_MASK) {
      case SND_SOC_DAIFMT_I2S:
      case SND_SOC_DAIFMT_LEFT_J:
      case SND_SOC_DAIFMT_RIGHT_J:
            cs42l51->audio_mode = format & SND_SOC_DAIFMT_FORMAT_MASK;
            break;
      default:
            dev_err(codec->dev, "invalid DAI format\n");
            ret = -EINVAL;
      }

      switch (format & SND_SOC_DAIFMT_MASTER_MASK) {
      case SND_SOC_DAIFMT_CBM_CFM:
            cs42l51->func = MODE_MASTER;
            break;
      case SND_SOC_DAIFMT_CBS_CFS:
            cs42l51->func = MODE_SLAVE_AUTO;
            break;
      default:
            ret = -EINVAL;
            break;
      }

      return ret;
}

00320 struct cs42l51_ratios {
      unsigned int ratio;
      unsigned char speed_mode;
      unsigned char mclk;
};

static struct cs42l51_ratios slave_ratios[] = {
      {  512, CS42L51_QSM_MODE, 0 }, {  768, CS42L51_QSM_MODE, 0 },
      { 1024, CS42L51_QSM_MODE, 0 }, { 1536, CS42L51_QSM_MODE, 0 },
      { 2048, CS42L51_QSM_MODE, 0 }, { 3072, CS42L51_QSM_MODE, 0 },
      {  256, CS42L51_HSM_MODE, 0 }, {  384, CS42L51_HSM_MODE, 0 },
      {  512, CS42L51_HSM_MODE, 0 }, {  768, CS42L51_HSM_MODE, 0 },
      { 1024, CS42L51_HSM_MODE, 0 }, { 1536, CS42L51_HSM_MODE, 0 },
      {  128, CS42L51_SSM_MODE, 0 }, {  192, CS42L51_SSM_MODE, 0 },
      {  256, CS42L51_SSM_MODE, 0 }, {  384, CS42L51_SSM_MODE, 0 },
      {  512, CS42L51_SSM_MODE, 0 }, {  768, CS42L51_SSM_MODE, 0 },
      {  128, CS42L51_DSM_MODE, 0 }, {  192, CS42L51_DSM_MODE, 0 },
      {  256, CS42L51_DSM_MODE, 0 }, {  384, CS42L51_DSM_MODE, 0 },
};

static struct cs42l51_ratios slave_auto_ratios[] = {
      { 1024, CS42L51_QSM_MODE, 0 }, { 1536, CS42L51_QSM_MODE, 0 },
      { 2048, CS42L51_QSM_MODE, 1 }, { 3072, CS42L51_QSM_MODE, 1 },
      {  512, CS42L51_HSM_MODE, 0 }, {  768, CS42L51_HSM_MODE, 0 },
      { 1024, CS42L51_HSM_MODE, 1 }, { 1536, CS42L51_HSM_MODE, 1 },
      {  256, CS42L51_SSM_MODE, 0 }, {  384, CS42L51_SSM_MODE, 0 },
      {  512, CS42L51_SSM_MODE, 1 }, {  768, CS42L51_SSM_MODE, 1 },
      {  128, CS42L51_DSM_MODE, 0 }, {  192, CS42L51_DSM_MODE, 0 },
      {  256, CS42L51_DSM_MODE, 1 }, {  384, CS42L51_DSM_MODE, 1 },
};

static int cs42l51_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 cs42l51_private *cs42l51 = snd_soc_codec_get_drvdata(codec);

      cs42l51->mclk = freq;
      return 0;
}

static int cs42l51_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_codec *codec = rtd->codec;
      struct cs42l51_private *cs42l51 = snd_soc_codec_get_drvdata(codec);
      int ret;
      unsigned int i;
      unsigned int rate;
      unsigned int ratio;
      struct cs42l51_ratios *ratios = NULL;
      int nr_ratios = 0;
      int intf_ctl, power_ctl, fmt;

      switch (cs42l51->func) {
      case MODE_MASTER:
            return -EINVAL;
      case MODE_SLAVE:
            ratios = slave_ratios;
            nr_ratios = ARRAY_SIZE(slave_ratios);
            break;
      case MODE_SLAVE_AUTO:
            ratios = slave_auto_ratios;
            nr_ratios = ARRAY_SIZE(slave_auto_ratios);
            break;
      }

      /* Figure out which MCLK/LRCK ratio to use */
      rate = params_rate(params);     /* Sampling rate, in Hz */
      ratio = cs42l51->mclk / rate;    /* MCLK/LRCK ratio */
      for (i = 0; i < nr_ratios; i++) {
            if (ratios[i].ratio == ratio)
                  break;
      }

      if (i == nr_ratios) {
            /* We did not find a matching ratio */
            dev_err(codec->dev, "could not find matching ratio\n");
            return -EINVAL;
      }

      intf_ctl = snd_soc_read(codec, CS42L51_INTF_CTL);
      power_ctl = snd_soc_read(codec, CS42L51_MIC_POWER_CTL);

      intf_ctl &= ~(CS42L51_INTF_CTL_MASTER | CS42L51_INTF_CTL_ADC_I2S
                  | CS42L51_INTF_CTL_DAC_FORMAT(7));
      power_ctl &= ~(CS42L51_MIC_POWER_CTL_SPEED(3)
                  | CS42L51_MIC_POWER_CTL_MCLK_DIV2);

      switch (cs42l51->func) {
      case MODE_MASTER:
            intf_ctl |= CS42L51_INTF_CTL_MASTER;
            power_ctl |= CS42L51_MIC_POWER_CTL_SPEED(ratios[i].speed_mode);
            break;
      case MODE_SLAVE:
            power_ctl |= CS42L51_MIC_POWER_CTL_SPEED(ratios[i].speed_mode);
            break;
      case MODE_SLAVE_AUTO:
            power_ctl |= CS42L51_MIC_POWER_CTL_AUTO;
            break;
      }

      switch (cs42l51->audio_mode) {
      case SND_SOC_DAIFMT_I2S:
            intf_ctl |= CS42L51_INTF_CTL_ADC_I2S;
            intf_ctl |= CS42L51_INTF_CTL_DAC_FORMAT(CS42L51_DAC_DIF_I2S);
            break;
      case SND_SOC_DAIFMT_LEFT_J:
            intf_ctl |= CS42L51_INTF_CTL_DAC_FORMAT(CS42L51_DAC_DIF_LJ24);
            break;
      case SND_SOC_DAIFMT_RIGHT_J:
            switch (params_format(params)) {
            case SNDRV_PCM_FORMAT_S16_LE:
            case SNDRV_PCM_FORMAT_S16_BE:
                  fmt = CS42L51_DAC_DIF_RJ16;
                  break;
            case SNDRV_PCM_FORMAT_S18_3LE:
            case SNDRV_PCM_FORMAT_S18_3BE:
                  fmt = CS42L51_DAC_DIF_RJ18;
                  break;
            case SNDRV_PCM_FORMAT_S20_3LE:
            case SNDRV_PCM_FORMAT_S20_3BE:
                  fmt = CS42L51_DAC_DIF_RJ20;
                  break;
            case SNDRV_PCM_FORMAT_S24_LE:
            case SNDRV_PCM_FORMAT_S24_BE:
                  fmt = CS42L51_DAC_DIF_RJ24;
                  break;
            default:
                  dev_err(codec->dev, "unknown format\n");
                  return -EINVAL;
            }
            intf_ctl |= CS42L51_INTF_CTL_DAC_FORMAT(fmt);
            break;
      default:
            dev_err(codec->dev, "unknown format\n");
            return -EINVAL;
      }

      if (ratios[i].mclk)
            power_ctl |= CS42L51_MIC_POWER_CTL_MCLK_DIV2;

      ret = snd_soc_write(codec, CS42L51_INTF_CTL, intf_ctl);
      if (ret < 0)
            return ret;

      ret = snd_soc_write(codec, CS42L51_MIC_POWER_CTL, power_ctl);
      if (ret < 0)
            return ret;

      return 0;
}

static int cs42l51_dai_mute(struct snd_soc_dai *dai, int mute)
{
      struct snd_soc_codec *codec = dai->codec;
      int reg;
      int mask = CS42L51_DAC_OUT_CTL_DACA_MUTE|CS42L51_DAC_OUT_CTL_DACB_MUTE;

      reg = snd_soc_read(codec, CS42L51_DAC_OUT_CTL);

      if (mute)
            reg |= mask;
      else
            reg &= ~mask;

      return snd_soc_write(codec, CS42L51_DAC_OUT_CTL, reg);
}

static struct snd_soc_dai_ops cs42l51_dai_ops = {
      .hw_params      = cs42l51_hw_params,
      .set_sysclk     = cs42l51_set_dai_sysclk,
      .set_fmt        = cs42l51_set_dai_fmt,
      .digital_mute   = cs42l51_dai_mute,
};

static struct snd_soc_dai_driver cs42l51_dai = {
      .name = "cs42l51-hifi",
      .playback = {
            .stream_name = "Playback",
            .channels_min = 1,
            .channels_max = 2,
            .rates = SNDRV_PCM_RATE_8000_96000,
            .formats = CS42L51_FORMATS,
      },
      .capture = {
            .stream_name = "Capture",
            .channels_min = 1,
            .channels_max = 2,
            .rates = SNDRV_PCM_RATE_8000_96000,
            .formats = CS42L51_FORMATS,
      },
      .ops = &cs42l51_dai_ops,
};

static int cs42l51_probe(struct snd_soc_codec *codec)
{
      struct cs42l51_private *cs42l51 = snd_soc_codec_get_drvdata(codec);
      struct snd_soc_dapm_context *dapm = &codec->dapm;
      int ret, reg;

      codec->control_data = cs42l51->control_data;

      ret = cs42l51_fill_cache(codec);
      if (ret < 0) {
            dev_err(codec->dev, "failed to fill register cache\n");
            return ret;
      }

      ret = snd_soc_codec_set_cache_io(codec, 8, 8, cs42l51->control_type);
      if (ret < 0) {
            dev_err(codec->dev, "Failed to set cache I/O: %d\n", ret);
            return ret;
      }

      /*
       * DAC configuration
       * - Use signal processor
       * - auto mute
       * - vol changes immediate
       * - no de-emphasize
       */
      reg = CS42L51_DAC_CTL_DATA_SEL(1)
            | CS42L51_DAC_CTL_AMUTE | CS42L51_DAC_CTL_DACSZ(0);
      ret = snd_soc_write(codec, CS42L51_DAC_CTL, reg);
      if (ret < 0)
            return ret;

      snd_soc_add_controls(codec, cs42l51_snd_controls,
            ARRAY_SIZE(cs42l51_snd_controls));
      snd_soc_dapm_new_controls(dapm, cs42l51_dapm_widgets,
            ARRAY_SIZE(cs42l51_dapm_widgets));
      snd_soc_dapm_add_routes(dapm, cs42l51_routes,
            ARRAY_SIZE(cs42l51_routes));

      return 0;
}

static struct snd_soc_codec_driver soc_codec_device_cs42l51 = {
      .probe =    cs42l51_probe,
      .reg_cache_size = CS42L51_NUMREGS,
      .reg_word_size = sizeof(u8),
};

static int cs42l51_i2c_probe(struct i2c_client *i2c_client,
      const struct i2c_device_id *id)
{
      struct cs42l51_private *cs42l51;
      int ret;

      /* Verify that we have a CS42L51 */
      ret = i2c_smbus_read_byte_data(i2c_client, CS42L51_CHIP_REV_ID);
      if (ret < 0) {
            dev_err(&i2c_client->dev, "failed to read I2C\n");
            goto error;
      }

      if ((ret != CS42L51_MK_CHIP_REV(CS42L51_CHIP_ID, CS42L51_CHIP_REV_A)) &&
          (ret != CS42L51_MK_CHIP_REV(CS42L51_CHIP_ID, CS42L51_CHIP_REV_B))) {
            dev_err(&i2c_client->dev, "Invalid chip id\n");
            ret = -ENODEV;
            goto error;
      }

      dev_info(&i2c_client->dev, "found device cs42l51 rev %d\n",
                        ret & 7);

      cs42l51 = kzalloc(sizeof(struct cs42l51_private), GFP_KERNEL);
      if (!cs42l51) {
            dev_err(&i2c_client->dev, "could not allocate codec\n");
            return -ENOMEM;
      }

      i2c_set_clientdata(i2c_client, cs42l51);
      cs42l51->control_data = i2c_client;
      cs42l51->control_type = SND_SOC_I2C;

      ret =  snd_soc_register_codec(&i2c_client->dev,
                  &soc_codec_device_cs42l51, &cs42l51_dai, 1);
      if (ret < 0)
            kfree(cs42l51);
error:
      return ret;
}

static int cs42l51_i2c_remove(struct i2c_client *client)
{
      struct cs42l51_private *cs42l51 = i2c_get_clientdata(client);

      snd_soc_unregister_codec(&client->dev);
      kfree(cs42l51);
      return 0;
}

static const struct i2c_device_id cs42l51_id[] = {
      {"cs42l51", 0},
      {}
};
MODULE_DEVICE_TABLE(i2c, cs42l51_id);

static struct i2c_driver cs42l51_i2c_driver = {
      .driver = {
            .name = "cs42l51-codec",
            .owner = THIS_MODULE,
      },
      .id_table = cs42l51_id,
      .probe = cs42l51_i2c_probe,
      .remove = cs42l51_i2c_remove,
};

static int __init cs42l51_init(void)
{
      int ret;

      ret = i2c_add_driver(&cs42l51_i2c_driver);
      if (ret != 0) {
            printk(KERN_ERR "%s: can't add i2c driver\n", __func__);
            return ret;
      }
      return 0;
}
module_init(cs42l51_init);

static void __exit cs42l51_exit(void)
{
      i2c_del_driver(&cs42l51_i2c_driver);
}
module_exit(cs42l51_exit);

MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>");
MODULE_DESCRIPTION("Cirrus Logic CS42L51 ALSA SoC Codec Driver");
MODULE_LICENSE("GPL");

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