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wm8731.c

/*
 * wm8731.c  --  WM8731 ALSA SoC Audio driver
 *
 * Copyright 2005 Openedhand Ltd.
 *
 * Author: Richard Purdie <richard@openedhand.com>
 *
 * Based on wm8753.c by Liam Girdwood
 *
 * 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.
 */

#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/spi/spi.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/initval.h>

#include "wm8731.h"

static struct snd_soc_codec *wm8731_codec;
struct snd_soc_codec_device soc_codec_dev_wm8731;

/* codec private data */
struct wm8731_priv {
      struct snd_soc_codec codec;
      u16 reg_cache[WM8731_CACHEREGNUM];
      unsigned int sysclk;
};

#ifdef CONFIG_SPI_MASTER
static int wm8731_spi_write(struct spi_device *spi, const char *data, int len);
#endif

/*
 * wm8731 register cache
 * We can't read the WM8731 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 wm8731_reg[WM8731_CACHEREGNUM] = {
    0x0097, 0x0097, 0x0079, 0x0079,
    0x000a, 0x0008, 0x009f, 0x000a,
    0x0000, 0x0000
};

/*
 * read wm8731 register cache
 */
static inline unsigned int wm8731_read_reg_cache(struct snd_soc_codec *codec,
      unsigned int reg)
{
      u16 *cache = codec->reg_cache;
      if (reg == WM8731_RESET)
            return 0;
      if (reg >= WM8731_CACHEREGNUM)
            return -1;
      return cache[reg];
}

/*
 * write wm8731 register cache
 */
static inline void wm8731_write_reg_cache(struct snd_soc_codec *codec,
      u16 reg, unsigned int value)
{
      u16 *cache = codec->reg_cache;
      if (reg >= WM8731_CACHEREGNUM)
            return;
      cache[reg] = value;
}

/*
 * write to the WM8731 register space
 */
static int wm8731_write(struct snd_soc_codec *codec, unsigned int reg,
      unsigned int value)
{
      u8 data[2];

      /* data is
       *   D15..D9 WM8731 register offset
       *   D8...D0 register data
       */
      data[0] = (reg << 1) | ((value >> 8) & 0x0001);
      data[1] = value & 0x00ff;

      wm8731_write_reg_cache(codec, reg, value);
      if (codec->hw_write(codec->control_data, data, 2) == 2)
            return 0;
      else
            return -EIO;
}

#define wm8731_reset(c) wm8731_write(c, WM8731_RESET, 0)

static const char *wm8731_input_select[] = {"Line In", "Mic"};
static const char *wm8731_deemph[] = {"None", "32Khz", "44.1Khz", "48Khz"};

static const struct soc_enum wm8731_enum[] = {
      SOC_ENUM_SINGLE(WM8731_APANA, 2, 2, wm8731_input_select),
      SOC_ENUM_SINGLE(WM8731_APDIGI, 1, 4, wm8731_deemph),
};

static const struct snd_kcontrol_new wm8731_snd_controls[] = {

SOC_DOUBLE_R("Master Playback Volume", WM8731_LOUT1V, WM8731_ROUT1V,
      0, 127, 0),
SOC_DOUBLE_R("Master Playback ZC Switch", WM8731_LOUT1V, WM8731_ROUT1V,
      7, 1, 0),

SOC_DOUBLE_R("Capture Volume", WM8731_LINVOL, WM8731_RINVOL, 0, 31, 0),
SOC_DOUBLE_R("Line Capture Switch", WM8731_LINVOL, WM8731_RINVOL, 7, 1, 1),

SOC_SINGLE("Mic Boost (+20dB)", WM8731_APANA, 0, 1, 0),
SOC_SINGLE("Capture Mic Switch", WM8731_APANA, 1, 1, 1),

SOC_SINGLE("Sidetone Playback Volume", WM8731_APANA, 6, 3, 1),

SOC_SINGLE("ADC High Pass Filter Switch", WM8731_APDIGI, 0, 1, 1),
SOC_SINGLE("Store DC Offset Switch", WM8731_APDIGI, 4, 1, 0),

SOC_ENUM("Playback De-emphasis", wm8731_enum[1]),
};

/* Output Mixer */
static const struct snd_kcontrol_new wm8731_output_mixer_controls[] = {
SOC_DAPM_SINGLE("Line Bypass Switch", WM8731_APANA, 3, 1, 0),
SOC_DAPM_SINGLE("Mic Sidetone Switch", WM8731_APANA, 5, 1, 0),
SOC_DAPM_SINGLE("HiFi Playback Switch", WM8731_APANA, 4, 1, 0),
};

/* Input mux */
static const struct snd_kcontrol_new wm8731_input_mux_controls =
SOC_DAPM_ENUM("Input Select", wm8731_enum[0]);

static const struct snd_soc_dapm_widget wm8731_dapm_widgets[] = {
SND_SOC_DAPM_MIXER("Output Mixer", WM8731_PWR, 4, 1,
      &wm8731_output_mixer_controls[0],
      ARRAY_SIZE(wm8731_output_mixer_controls)),
SND_SOC_DAPM_DAC("DAC", "HiFi Playback", WM8731_PWR, 3, 1),
SND_SOC_DAPM_OUTPUT("LOUT"),
SND_SOC_DAPM_OUTPUT("LHPOUT"),
SND_SOC_DAPM_OUTPUT("ROUT"),
SND_SOC_DAPM_OUTPUT("RHPOUT"),
SND_SOC_DAPM_ADC("ADC", "HiFi Capture", WM8731_PWR, 2, 1),
SND_SOC_DAPM_MUX("Input Mux", SND_SOC_NOPM, 0, 0, &wm8731_input_mux_controls),
SND_SOC_DAPM_PGA("Line Input", WM8731_PWR, 0, 1, NULL, 0),
SND_SOC_DAPM_MICBIAS("Mic Bias", WM8731_PWR, 1, 1),
SND_SOC_DAPM_INPUT("MICIN"),
SND_SOC_DAPM_INPUT("RLINEIN"),
SND_SOC_DAPM_INPUT("LLINEIN"),
};

static const struct snd_soc_dapm_route intercon[] = {
      /* output mixer */
      {"Output Mixer", "Line Bypass Switch", "Line Input"},
      {"Output Mixer", "HiFi Playback Switch", "DAC"},
      {"Output Mixer", "Mic Sidetone Switch", "Mic Bias"},

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

      /* input mux */
      {"Input Mux", "Line In", "Line Input"},
      {"Input Mux", "Mic", "Mic Bias"},
      {"ADC", NULL, "Input Mux"},

      /* inputs */
      {"Line Input", NULL, "LLINEIN"},
      {"Line Input", NULL, "RLINEIN"},
      {"Mic Bias", NULL, "MICIN"},
};

static int wm8731_add_widgets(struct snd_soc_codec *codec)
{
      snd_soc_dapm_new_controls(codec, wm8731_dapm_widgets,
                          ARRAY_SIZE(wm8731_dapm_widgets));

      snd_soc_dapm_add_routes(codec, intercon, ARRAY_SIZE(intercon));

      snd_soc_dapm_new_widgets(codec);
      return 0;
}

struct _coeff_div {
      u32 mclk;
      u32 rate;
      u16 fs;
      u8 sr:4;
      u8 bosr:1;
      u8 usb:1;
};

/* codec mclk clock divider coefficients */
static const struct _coeff_div coeff_div[] = {
      /* 48k */
      {12288000, 48000, 256, 0x0, 0x0, 0x0},
      {18432000, 48000, 384, 0x0, 0x1, 0x0},
      {12000000, 48000, 250, 0x0, 0x0, 0x1},

      /* 32k */
      {12288000, 32000, 384, 0x6, 0x0, 0x0},
      {18432000, 32000, 576, 0x6, 0x1, 0x0},
      {12000000, 32000, 375, 0x6, 0x0, 0x1},

      /* 8k */
      {12288000, 8000, 1536, 0x3, 0x0, 0x0},
      {18432000, 8000, 2304, 0x3, 0x1, 0x0},
      {11289600, 8000, 1408, 0xb, 0x0, 0x0},
      {16934400, 8000, 2112, 0xb, 0x1, 0x0},
      {12000000, 8000, 1500, 0x3, 0x0, 0x1},

      /* 96k */
      {12288000, 96000, 128, 0x7, 0x0, 0x0},
      {18432000, 96000, 192, 0x7, 0x1, 0x0},
      {12000000, 96000, 125, 0x7, 0x0, 0x1},

      /* 44.1k */
      {11289600, 44100, 256, 0x8, 0x0, 0x0},
      {16934400, 44100, 384, 0x8, 0x1, 0x0},
      {12000000, 44100, 272, 0x8, 0x1, 0x1},

      /* 88.2k */
      {11289600, 88200, 128, 0xf, 0x0, 0x0},
      {16934400, 88200, 192, 0xf, 0x1, 0x0},
      {12000000, 88200, 136, 0xf, 0x1, 0x1},
};

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

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

static int wm8731_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;
      struct wm8731_priv *wm8731 = codec->private_data;
      u16 iface = wm8731_read_reg_cache(codec, WM8731_IFACE) & 0xfff3;
      int i = get_coeff(wm8731->sysclk, params_rate(params));
      u16 srate = (coeff_div[i].sr << 2) |
            (coeff_div[i].bosr << 1) | coeff_div[i].usb;

      wm8731_write(codec, WM8731_SRATE, srate);

      /* bit size */
      switch (params_format(params)) {
      case SNDRV_PCM_FORMAT_S16_LE:
            break;
      case SNDRV_PCM_FORMAT_S20_3LE:
            iface |= 0x0004;
            break;
      case SNDRV_PCM_FORMAT_S24_LE:
            iface |= 0x0008;
            break;
      }

      wm8731_write(codec, WM8731_IFACE, iface);
      return 0;
}

static int wm8731_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 */
      wm8731_write(codec, WM8731_ACTIVE, 0x0001);

      return 0;
}

static void wm8731_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;

      /* deactivate */
      if (!codec->active) {
            udelay(50);
            wm8731_write(codec, WM8731_ACTIVE, 0x0);
      }
}

static int wm8731_mute(struct snd_soc_dai *dai, int mute)
{
      struct snd_soc_codec *codec = dai->codec;
      u16 mute_reg = wm8731_read_reg_cache(codec, WM8731_APDIGI) & 0xfff7;

      if (mute)
            wm8731_write(codec, WM8731_APDIGI, mute_reg | 0x8);
      else
            wm8731_write(codec, WM8731_APDIGI, mute_reg);
      return 0;
}

static int wm8731_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 wm8731_priv *wm8731 = codec->private_data;

      switch (freq) {
      case 11289600:
      case 12000000:
      case 12288000:
      case 16934400:
      case 18432000:
            wm8731->sysclk = freq;
            return 0;
      }
      return -EINVAL;
}


static int wm8731_set_dai_fmt(struct snd_soc_dai *codec_dai,
            unsigned int fmt)
{
      struct snd_soc_codec *codec = codec_dai->codec;
      u16 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 |= 0x0003;
            break;
      case SND_SOC_DAIFMT_DSP_B:
            iface |= 0x0013;
            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 */
      wm8731_write(codec, WM8731_IFACE, iface);
      return 0;
}

static int wm8731_set_bias_level(struct snd_soc_codec *codec,
                         enum snd_soc_bias_level level)
{
      u16 reg;

      switch (level) {
      case SND_SOC_BIAS_ON:
            break;
      case SND_SOC_BIAS_PREPARE:
            break;
      case SND_SOC_BIAS_STANDBY:
            /* Clear PWROFF, gate CLKOUT, everything else as-is */
            reg = wm8731_read_reg_cache(codec, WM8731_PWR) & 0xff7f;
            wm8731_write(codec, WM8731_PWR, reg | 0x0040);
            break;
      case SND_SOC_BIAS_OFF:
            wm8731_write(codec, WM8731_ACTIVE, 0x0);
            wm8731_write(codec, WM8731_PWR, 0xffff);
            break;
      }
      codec->bias_level = level;
      return 0;
}

#define WM8731_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\
            SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050 |\
            SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |\
            SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 |\
            SNDRV_PCM_RATE_96000)

#define WM8731_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
      SNDRV_PCM_FMTBIT_S24_LE)

static struct snd_soc_dai_ops wm8731_dai_ops = {
      .prepare    = wm8731_pcm_prepare,
      .hw_params  = wm8731_hw_params,
      .shutdown   = wm8731_shutdown,
      .digital_mute     = wm8731_mute,
      .set_sysclk = wm8731_set_dai_sysclk,
      .set_fmt    = wm8731_set_dai_fmt,
};

struct snd_soc_dai wm8731_dai = {
      .name = "WM8731",
      .playback = {
            .stream_name = "Playback",
            .channels_min = 1,
            .channels_max = 2,
            .rates = WM8731_RATES,
            .formats = WM8731_FORMATS,},
      .capture = {
            .stream_name = "Capture",
            .channels_min = 1,
            .channels_max = 2,
            .rates = WM8731_RATES,
            .formats = WM8731_FORMATS,},
      .ops = &wm8731_dai_ops,
};
EXPORT_SYMBOL_GPL(wm8731_dai);

static int wm8731_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;

      wm8731_write(codec, WM8731_ACTIVE, 0x0);
      wm8731_set_bias_level(codec, SND_SOC_BIAS_OFF);
      return 0;
}

static int wm8731_resume(struct platform_device *pdev)
{
      struct snd_soc_device *socdev = platform_get_drvdata(pdev);
      struct snd_soc_codec *codec = socdev->card->codec;
      int i;
      u8 data[2];
      u16 *cache = codec->reg_cache;

      /* Sync reg_cache with the hardware */
      for (i = 0; i < ARRAY_SIZE(wm8731_reg); i++) {
            data[0] = (i << 1) | ((cache[i] >> 8) & 0x0001);
            data[1] = cache[i] & 0x00ff;
            codec->hw_write(codec->control_data, data, 2);
      }
      wm8731_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
      wm8731_set_bias_level(codec, codec->suspend_bias_level);
      return 0;
}

static int wm8731_probe(struct platform_device *pdev)
{
      struct snd_soc_device *socdev = platform_get_drvdata(pdev);
      struct snd_soc_codec *codec;
      int ret = 0;

      if (wm8731_codec == NULL) {
            dev_err(&pdev->dev, "Codec device not registered\n");
            return -ENODEV;
      }

      socdev->card->codec = wm8731_codec;
      codec = wm8731_codec;

      /* register pcms */
      ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
      if (ret < 0) {
            dev_err(codec->dev, "failed to create pcms: %d\n", ret);
            goto pcm_err;
      }

      snd_soc_add_controls(codec, wm8731_snd_controls,
                       ARRAY_SIZE(wm8731_snd_controls));
      wm8731_add_widgets(codec);
      ret = snd_soc_init_card(socdev);
      if (ret < 0) {
            dev_err(codec->dev, "failed to register card: %d\n", ret);
            goto card_err;
      }

      return ret;

card_err:
      snd_soc_free_pcms(socdev);
      snd_soc_dapm_free(socdev);
pcm_err:
      return ret;
}

/* power down chip */
static int wm8731_remove(struct platform_device *pdev)
{
      struct snd_soc_device *socdev = platform_get_drvdata(pdev);

      snd_soc_free_pcms(socdev);
      snd_soc_dapm_free(socdev);

      return 0;
}

struct snd_soc_codec_device soc_codec_dev_wm8731 = {
      .probe =    wm8731_probe,
      .remove =   wm8731_remove,
      .suspend =  wm8731_suspend,
      .resume =   wm8731_resume,
};
EXPORT_SYMBOL_GPL(soc_codec_dev_wm8731);

static int wm8731_register(struct wm8731_priv *wm8731)
{
      int ret;
      struct snd_soc_codec *codec = &wm8731->codec;
      u16 reg;

      if (wm8731_codec) {
            dev_err(codec->dev, "Another WM8731 is registered\n");
            return -EINVAL;
      }

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

      codec->private_data = wm8731;
      codec->name = "WM8731";
      codec->owner = THIS_MODULE;
      codec->read = wm8731_read_reg_cache;
      codec->write = wm8731_write;
      codec->bias_level = SND_SOC_BIAS_OFF;
      codec->set_bias_level = wm8731_set_bias_level;
      codec->dai = &wm8731_dai;
      codec->num_dai = 1;
      codec->reg_cache_size = WM8731_CACHEREGNUM;
      codec->reg_cache = &wm8731->reg_cache;

      memcpy(codec->reg_cache, wm8731_reg, sizeof(wm8731_reg));

      ret = wm8731_reset(codec);
      if (ret < 0) {
            dev_err(codec->dev, "Failed to issue reset\n");
            return ret;
      }

      wm8731_dai.dev = codec->dev;

      wm8731_set_bias_level(codec, SND_SOC_BIAS_STANDBY);

      /* Latch the update bits */
      reg = wm8731_read_reg_cache(codec, WM8731_LOUT1V);
      wm8731_write(codec, WM8731_LOUT1V, reg & ~0x0100);
      reg = wm8731_read_reg_cache(codec, WM8731_ROUT1V);
      wm8731_write(codec, WM8731_ROUT1V, reg & ~0x0100);
      reg = wm8731_read_reg_cache(codec, WM8731_LINVOL);
      wm8731_write(codec, WM8731_LINVOL, reg & ~0x0100);
      reg = wm8731_read_reg_cache(codec, WM8731_RINVOL);
      wm8731_write(codec, WM8731_RINVOL, reg & ~0x0100);

      /* Disable bypass path by default */
      reg = wm8731_read_reg_cache(codec, WM8731_APANA);
      wm8731_write(codec, WM8731_APANA, reg & ~0x4);

      wm8731_codec = codec;

      ret = snd_soc_register_codec(codec);
      if (ret != 0) {
            dev_err(codec->dev, "Failed to register codec: %d\n", ret);
            return ret;
      }

      ret = snd_soc_register_dai(&wm8731_dai);
      if (ret != 0) {
            dev_err(codec->dev, "Failed to register DAI: %d\n", ret);
            snd_soc_unregister_codec(codec);
            return ret;
      }

      return 0;
}

static void wm8731_unregister(struct wm8731_priv *wm8731)
{
      wm8731_set_bias_level(&wm8731->codec, SND_SOC_BIAS_OFF);
      snd_soc_unregister_dai(&wm8731_dai);
      snd_soc_unregister_codec(&wm8731->codec);
      kfree(wm8731);
      wm8731_codec = NULL;
}

#if defined(CONFIG_SPI_MASTER)
static int wm8731_spi_write(struct spi_device *spi, const char *data, int len)
{
      struct spi_transfer t;
      struct spi_message m;
      u8 msg[2];

      if (len <= 0)
            return 0;

      msg[0] = data[0];
      msg[1] = data[1];

      spi_message_init(&m);
      memset(&t, 0, (sizeof t));

      t.tx_buf = &msg[0];
      t.len = len;

      spi_message_add_tail(&t, &m);
      spi_sync(spi, &m);

      return len;
}

static int __devinit wm8731_spi_probe(struct spi_device *spi)
{
      struct snd_soc_codec *codec;
      struct wm8731_priv *wm8731;

      wm8731 = kzalloc(sizeof(struct wm8731_priv), GFP_KERNEL);
      if (wm8731 == NULL)
            return -ENOMEM;

      codec = &wm8731->codec;
      codec->control_data = spi;
      codec->hw_write = (hw_write_t)wm8731_spi_write;
      codec->dev = &spi->dev;

      spi->dev.driver_data = wm8731;

      return wm8731_register(wm8731);
}

static int __devexit wm8731_spi_remove(struct spi_device *spi)
{
      struct wm8731_priv *wm8731 = spi->dev.driver_data;

      wm8731_unregister(wm8731);

      return 0;
}

static struct spi_driver wm8731_spi_driver = {
      .driver = {
            .name = "wm8731",
            .bus  = &spi_bus_type,
            .owner      = THIS_MODULE,
      },
      .probe            = wm8731_spi_probe,
      .remove           = __devexit_p(wm8731_spi_remove),
};
#endif /* CONFIG_SPI_MASTER */

#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
static __devinit int wm8731_i2c_probe(struct i2c_client *i2c,
                              const struct i2c_device_id *id)
{
      struct wm8731_priv *wm8731;
      struct snd_soc_codec *codec;

      wm8731 = kzalloc(sizeof(struct wm8731_priv), GFP_KERNEL);
      if (wm8731 == NULL)
            return -ENOMEM;

      codec = &wm8731->codec;
      codec->hw_write = (hw_write_t)i2c_master_send;

      i2c_set_clientdata(i2c, wm8731);
      codec->control_data = i2c;

      codec->dev = &i2c->dev;

      return wm8731_register(wm8731);
}

static __devexit int wm8731_i2c_remove(struct i2c_client *client)
{
      struct wm8731_priv *wm8731 = i2c_get_clientdata(client);
      wm8731_unregister(wm8731);
      return 0;
}

static const struct i2c_device_id wm8731_i2c_id[] = {
      { "wm8731", 0 },
      { }
};
MODULE_DEVICE_TABLE(i2c, wm8731_i2c_id);

static struct i2c_driver wm8731_i2c_driver = {
      .driver = {
            .name = "WM8731 I2C Codec",
            .owner = THIS_MODULE,
      },
      .probe =    wm8731_i2c_probe,
      .remove =   __devexit_p(wm8731_i2c_remove),
      .id_table = wm8731_i2c_id,
};
#endif

static int __init wm8731_modinit(void)
{
      int ret;
#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
      ret = i2c_add_driver(&wm8731_i2c_driver);
      if (ret != 0) {
            printk(KERN_ERR "Failed to register WM8731 I2C driver: %d\n",
                   ret);
      }
#endif
#if defined(CONFIG_SPI_MASTER)
      ret = spi_register_driver(&wm8731_spi_driver);
      if (ret != 0) {
            printk(KERN_ERR "Failed to register WM8731 SPI driver: %d\n",
                   ret);
      }
#endif
      return 0;
}
module_init(wm8731_modinit);

static void __exit wm8731_exit(void)
{
#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
      i2c_del_driver(&wm8731_i2c_driver);
#endif
#if defined(CONFIG_SPI_MASTER)
      spi_unregister_driver(&wm8731_spi_driver);
#endif
}
module_exit(wm8731_exit);

MODULE_DESCRIPTION("ASoC WM8731 driver");
MODULE_AUTHOR("Richard Purdie");
MODULE_LICENSE("GPL");

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