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wm8804.c

/*
 * wm8804.c  --  WM8804 S/PDIF transceiver driver
 *
 * Copyright 2010 Wolfson Microelectronics plc
 *
 * Author: Dimitris Papastamos <dp@opensource.wolfsonmicro.com>
 *
 * 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/spi/spi.h>
#include <linux/regulator/consumer.h>
#include <linux/slab.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/initval.h>
#include <sound/tlv.h>

#include "wm8804.h"

#define WM8804_NUM_SUPPLIES 2
static const char *wm8804_supply_names[WM8804_NUM_SUPPLIES] = {
      "PVDD",
      "DVDD"
};

static const u8 wm8804_reg_defs[] = {
      0x05,     /* R0  - RST/DEVID1 */
      0x88,     /* R1  - DEVID2 */
      0x04,     /* R2  - DEVREV */
      0x21,     /* R3  - PLL1 */
      0xFD,     /* R4  - PLL2 */
      0x36,     /* R5  - PLL3 */
      0x07,     /* R6  - PLL4 */
      0x16,     /* R7  - PLL5 */
      0x18,     /* R8  - PLL6 */
      0xFF,     /* R9  - SPDMODE */
      0x00,     /* R10 - INTMASK */
      0x00,     /* R11 - INTSTAT */
      0x00,     /* R12 - SPDSTAT */
      0x00,     /* R13 - RXCHAN1 */
      0x00,     /* R14 - RXCHAN2 */
      0x00,     /* R15 - RXCHAN3 */
      0x00,     /* R16 - RXCHAN4 */
      0x00,     /* R17 - RXCHAN5 */
      0x00,     /* R18 - SPDTX1 */
      0x00,     /* R19 - SPDTX2 */
      0x00,     /* R20 - SPDTX3 */
      0x71,     /* R21 - SPDTX4 */
      0x0B,     /* R22 - SPDTX5 */
      0x70,     /* R23 - GPO0 */
      0x57,     /* R24 - GPO1 */
      0x00,     /* R25 */
      0x42,     /* R26 - GPO2 */
      0x06,     /* R27 - AIFTX */
      0x06,     /* R28 - AIFRX */
      0x80,     /* R29 - SPDRX1 */
      0x07,     /* R30 - PWRDN */
};

00071 struct wm8804_priv {
      enum snd_soc_control_type control_type;
      struct regulator_bulk_data supplies[WM8804_NUM_SUPPLIES];
      struct notifier_block disable_nb[WM8804_NUM_SUPPLIES];
      struct snd_soc_codec *codec;
};

static int txsrc_get(struct snd_kcontrol *kcontrol,
                 struct snd_ctl_elem_value *ucontrol);

static int txsrc_put(struct snd_kcontrol *kcontrol,
                 struct snd_ctl_elem_value *ucontrol);

/*
 * We can't use the same notifier block for more than one supply and
 * there's no way I can see to get from a callback to the caller
 * except container_of().
 */
#define WM8804_REGULATOR_EVENT(n) \
static int wm8804_regulator_event_##n(struct notifier_block *nb, \
                              unsigned long event, void *data)    \
{ \
      struct wm8804_priv *wm8804 = container_of(nb, struct wm8804_priv, \
                                      disable_nb[n]); \
      if (event & REGULATOR_EVENT_DISABLE) { \
            wm8804->codec->cache_sync = 1; \
      } \
      return 0; \
}

WM8804_REGULATOR_EVENT(0)
WM8804_REGULATOR_EVENT(1)

static const char *txsrc_text[] = { "S/PDIF RX", "AIF" };
static const SOC_ENUM_SINGLE_EXT_DECL(txsrc, txsrc_text);

static const struct snd_kcontrol_new wm8804_snd_controls[] = {
      SOC_ENUM_EXT("Input Source", txsrc, txsrc_get, txsrc_put),
      SOC_SINGLE("TX Playback Switch", WM8804_PWRDN, 2, 1, 1),
      SOC_SINGLE("AIF Playback Switch", WM8804_PWRDN, 4, 1, 1)
};

static int txsrc_get(struct snd_kcontrol *kcontrol,
                 struct snd_ctl_elem_value *ucontrol)
{
      struct snd_soc_codec *codec;
      unsigned int src;

      codec = snd_kcontrol_chip(kcontrol);
      src = snd_soc_read(codec, WM8804_SPDTX4);
      if (src & 0x40)
            ucontrol->value.integer.value[0] = 1;
      else
            ucontrol->value.integer.value[0] = 0;

      return 0;
}

static int txsrc_put(struct snd_kcontrol *kcontrol,
                 struct snd_ctl_elem_value *ucontrol)
{
      struct snd_soc_codec *codec;
      unsigned int src, txpwr;

      codec = snd_kcontrol_chip(kcontrol);

      if (ucontrol->value.integer.value[0] != 0
                  && ucontrol->value.integer.value[0] != 1)
            return -EINVAL;

      src = snd_soc_read(codec, WM8804_SPDTX4);
      switch ((src & 0x40) >> 6) {
      case 0:
            if (!ucontrol->value.integer.value[0])
                  return 0;
            break;
      case 1:
            if (ucontrol->value.integer.value[1])
                  return 0;
            break;
      }

      /* save the current power state of the transmitter */
      txpwr = snd_soc_read(codec, WM8804_PWRDN) & 0x4;
      /* power down the transmitter */
      snd_soc_update_bits(codec, WM8804_PWRDN, 0x4, 0x4);
      /* set the tx source */
      snd_soc_update_bits(codec, WM8804_SPDTX4, 0x40,
                      ucontrol->value.integer.value[0] << 6);

      if (ucontrol->value.integer.value[0]) {
            /* power down the receiver */
            snd_soc_update_bits(codec, WM8804_PWRDN, 0x2, 0x2);
            /* power up the AIF */
            snd_soc_update_bits(codec, WM8804_PWRDN, 0x10, 0);
      } else {
            /* don't power down the AIF -- may be used as an output */
            /* power up the receiver */
            snd_soc_update_bits(codec, WM8804_PWRDN, 0x2, 0);
      }

      /* restore the transmitter's configuration */
      snd_soc_update_bits(codec, WM8804_PWRDN, 0x4, txpwr);

      return 0;
}

static int wm8804_volatile(struct snd_soc_codec *codec, unsigned int reg)
{
      switch (reg) {
      case WM8804_RST_DEVID1:
      case WM8804_DEVID2:
      case WM8804_DEVREV:
      case WM8804_INTSTAT:
      case WM8804_SPDSTAT:
      case WM8804_RXCHAN1:
      case WM8804_RXCHAN2:
      case WM8804_RXCHAN3:
      case WM8804_RXCHAN4:
      case WM8804_RXCHAN5:
            return 1;
      default:
            break;
      }

      return 0;
}

static int wm8804_reset(struct snd_soc_codec *codec)
{
      return snd_soc_write(codec, WM8804_RST_DEVID1, 0x0);
}

static int wm8804_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
{
      struct snd_soc_codec *codec;
      u16 format, master, bcp, lrp;

      codec = dai->codec;

      switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
      case SND_SOC_DAIFMT_I2S:
            format = 0x2;
            break;
      case SND_SOC_DAIFMT_RIGHT_J:
            format = 0x0;
            break;
      case SND_SOC_DAIFMT_LEFT_J:
            format = 0x1;
            break;
      case SND_SOC_DAIFMT_DSP_A:
      case SND_SOC_DAIFMT_DSP_B:
            format = 0x3;
            break;
      default:
            dev_err(dai->dev, "Unknown dai format\n");
            return -EINVAL;
      }

      /* set data format */
      snd_soc_update_bits(codec, WM8804_AIFTX, 0x3, format);
      snd_soc_update_bits(codec, WM8804_AIFRX, 0x3, format);

      switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
      case SND_SOC_DAIFMT_CBM_CFM:
            master = 1;
            break;
      case SND_SOC_DAIFMT_CBS_CFS:
            master = 0;
            break;
      default:
            dev_err(dai->dev, "Unknown master/slave configuration\n");
            return -EINVAL;
      }

      /* set master/slave mode */
      snd_soc_update_bits(codec, WM8804_AIFRX, 0x40, master << 6);

      bcp = lrp = 0;
      switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
      case SND_SOC_DAIFMT_NB_NF:
            break;
      case SND_SOC_DAIFMT_IB_IF:
            bcp = lrp = 1;
            break;
      case SND_SOC_DAIFMT_IB_NF:
            bcp = 1;
            break;
      case SND_SOC_DAIFMT_NB_IF:
            lrp = 1;
            break;
      default:
            dev_err(dai->dev, "Unknown polarity configuration\n");
            return -EINVAL;
      }

      /* set frame inversion */
      snd_soc_update_bits(codec, WM8804_AIFTX, 0x10 | 0x20,
                      (bcp << 4) | (lrp << 5));
      snd_soc_update_bits(codec, WM8804_AIFRX, 0x10 | 0x20,
                      (bcp << 4) | (lrp << 5));
      return 0;
}

static int wm8804_hw_params(struct snd_pcm_substream *substream,
                      struct snd_pcm_hw_params *params,
                      struct snd_soc_dai *dai)
{
      struct snd_soc_codec *codec;
      u16 blen;

      codec = dai->codec;

      switch (params_format(params)) {
      case SNDRV_PCM_FORMAT_S16_LE:
            blen = 0x0;
            break;
      case SNDRV_PCM_FORMAT_S20_3LE:
            blen = 0x1;
            break;
      case SNDRV_PCM_FORMAT_S24_LE:
            blen = 0x2;
            break;
      default:
            dev_err(dai->dev, "Unsupported word length: %u\n",
                  params_format(params));
            return -EINVAL;
      }

      /* set word length */
      snd_soc_update_bits(codec, WM8804_AIFTX, 0xc, blen << 2);
      snd_soc_update_bits(codec, WM8804_AIFRX, 0xc, blen << 2);

      return 0;
}

00307 struct pll_div {
      u32 prescale:1;
      u32 mclkdiv:1;
      u32 freqmode:2;
      u32 n:4;
      u32 k:22;
};

/* PLL rate to output rate divisions */
static struct {
      unsigned int div;
      unsigned int freqmode;
      unsigned int mclkdiv;
} post_table[] = {
      {  2,  0, 0 },
      {  4,  0, 1 },
      {  4,  1, 0 },
      {  8,  1, 1 },
      {  8,  2, 0 },
      { 16,  2, 1 },
      { 12,  3, 0 },
      { 24,  3, 1 }
};

#define FIXED_PLL_SIZE ((1ULL << 22) * 10)
static int pll_factors(struct pll_div *pll_div, unsigned int target,
                   unsigned int source)
{
      u64 Kpart;
      unsigned long int K, Ndiv, Nmod, tmp;
      int i;

      /*
       * Scale the output frequency up; the PLL should run in the
       * region of 90-100MHz.
       */
      for (i = 0; i < ARRAY_SIZE(post_table); i++) {
            tmp = target * post_table[i].div;
            if (tmp >= 90000000 && tmp <= 100000000) {
                  pll_div->freqmode = post_table[i].freqmode;
                  pll_div->mclkdiv = post_table[i].mclkdiv;
                  target *= post_table[i].div;
                  break;
            }
      }

      if (i == ARRAY_SIZE(post_table)) {
            pr_err("%s: Unable to scale output frequency: %uHz\n",
                   __func__, target);
            return -EINVAL;
      }

      pll_div->prescale = 0;
      Ndiv = target / source;
      if (Ndiv < 5) {
            source >>= 1;
            pll_div->prescale = 1;
            Ndiv = target / source;
      }

      if (Ndiv < 5 || Ndiv > 13) {
            pr_err("%s: WM8804 N value is not within the recommended range: %lu\n",
                   __func__, Ndiv);
            return -EINVAL;
      }
      pll_div->n = Ndiv;

      Nmod = target % source;
      Kpart = FIXED_PLL_SIZE * (u64)Nmod;

      do_div(Kpart, source);

      K = Kpart & 0xffffffff;
      if ((K % 10) >= 5)
            K += 5;
      K /= 10;
      pll_div->k = K;

      return 0;
}

static int wm8804_set_pll(struct snd_soc_dai *dai, int pll_id,
                    int source, unsigned int freq_in,
                    unsigned int freq_out)
{
      struct snd_soc_codec *codec;

      codec = dai->codec;
      if (!freq_in || !freq_out) {
            /* disable the PLL */
            snd_soc_update_bits(codec, WM8804_PWRDN, 0x1, 0x1);
            return 0;
      } else {
            int ret;
            struct pll_div pll_div;

            ret = pll_factors(&pll_div, freq_out, freq_in);
            if (ret)
                  return ret;

            /* power down the PLL before reprogramming it */
            snd_soc_update_bits(codec, WM8804_PWRDN, 0x1, 0x1);

            if (!freq_in || !freq_out)
                  return 0;

            /* set PLLN and PRESCALE */
            snd_soc_update_bits(codec, WM8804_PLL4, 0xf | 0x10,
                            pll_div.n | (pll_div.prescale << 4));
            /* set mclkdiv and freqmode */
            snd_soc_update_bits(codec, WM8804_PLL5, 0x3 | 0x8,
                            pll_div.freqmode | (pll_div.mclkdiv << 3));
            /* set PLLK */
            snd_soc_write(codec, WM8804_PLL1, pll_div.k & 0xff);
            snd_soc_write(codec, WM8804_PLL2, (pll_div.k >> 8) & 0xff);
            snd_soc_write(codec, WM8804_PLL3, pll_div.k >> 16);

            /* power up the PLL */
            snd_soc_update_bits(codec, WM8804_PWRDN, 0x1, 0);
      }

      return 0;
}

static int wm8804_set_sysclk(struct snd_soc_dai *dai,
                       int clk_id, unsigned int freq, int dir)
{
      struct snd_soc_codec *codec;

      codec = dai->codec;

      switch (clk_id) {
      case WM8804_TX_CLKSRC_MCLK:
            if ((freq >= 10000000 && freq <= 14400000)
                        || (freq >= 16280000 && freq <= 27000000))
                  snd_soc_update_bits(codec, WM8804_PLL6, 0x80, 0x80);
            else {
                  dev_err(dai->dev, "OSCCLOCK is not within the "
                        "recommended range: %uHz\n", freq);
                  return -EINVAL;
            }
            break;
      case WM8804_TX_CLKSRC_PLL:
            snd_soc_update_bits(codec, WM8804_PLL6, 0x80, 0);
            break;
      case WM8804_CLKOUT_SRC_CLK1:
            snd_soc_update_bits(codec, WM8804_PLL6, 0x8, 0);
            break;
      case WM8804_CLKOUT_SRC_OSCCLK:
            snd_soc_update_bits(codec, WM8804_PLL6, 0x8, 0x8);
            break;
      default:
            dev_err(dai->dev, "Unknown clock source: %d\n", clk_id);
            return -EINVAL;
      }

      return 0;
}

static int wm8804_set_clkdiv(struct snd_soc_dai *dai,
                       int div_id, int div)
{
      struct snd_soc_codec *codec;

      codec = dai->codec;
      switch (div_id) {
      case WM8804_CLKOUT_DIV:
            snd_soc_update_bits(codec, WM8804_PLL5, 0x30,
                            (div & 0x3) << 4);
            break;
      default:
            dev_err(dai->dev, "Unknown clock divider: %d\n", div_id);
            return -EINVAL;
      }
      return 0;
}

static void wm8804_sync_cache(struct snd_soc_codec *codec)
{
      short i;
      u8 *cache;

      if (!codec->cache_sync)
            return;

      codec->cache_only = 0;
      cache = codec->reg_cache;
      for (i = 0; i < codec->driver->reg_cache_size; i++) {
            if (i == WM8804_RST_DEVID1 || cache[i] == wm8804_reg_defs[i])
                  continue;
            snd_soc_write(codec, i, cache[i]);
      }
      codec->cache_sync = 0;
}

static int wm8804_set_bias_level(struct snd_soc_codec *codec,
                         enum snd_soc_bias_level level)
{
      int ret;
      struct wm8804_priv *wm8804;

      wm8804 = snd_soc_codec_get_drvdata(codec);
      switch (level) {
      case SND_SOC_BIAS_ON:
            break;
      case SND_SOC_BIAS_PREPARE:
            /* power up the OSC and the PLL */
            snd_soc_update_bits(codec, WM8804_PWRDN, 0x9, 0);
            break;
      case SND_SOC_BIAS_STANDBY:
            if (codec->dapm.bias_level == SND_SOC_BIAS_OFF) {
                  ret = regulator_bulk_enable(ARRAY_SIZE(wm8804->supplies),
                                        wm8804->supplies);
                  if (ret) {
                        dev_err(codec->dev,
                              "Failed to enable supplies: %d\n",
                              ret);
                        return ret;
                  }
                  wm8804_sync_cache(codec);
            }
            /* power down the OSC and the PLL */
            snd_soc_update_bits(codec, WM8804_PWRDN, 0x9, 0x9);
            break;
      case SND_SOC_BIAS_OFF:
            /* power down the OSC and the PLL */
            snd_soc_update_bits(codec, WM8804_PWRDN, 0x9, 0x9);
            regulator_bulk_disable(ARRAY_SIZE(wm8804->supplies),
                               wm8804->supplies);
            break;
      }

      codec->dapm.bias_level = level;
      return 0;
}

#ifdef CONFIG_PM
static int wm8804_suspend(struct snd_soc_codec *codec, pm_message_t state)
{
      wm8804_set_bias_level(codec, SND_SOC_BIAS_OFF);
      return 0;
}

static int wm8804_resume(struct snd_soc_codec *codec)
{
      wm8804_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
      return 0;
}
#else
#define wm8804_suspend NULL
#define wm8804_resume NULL
#endif

static int wm8804_remove(struct snd_soc_codec *codec)
{
      struct wm8804_priv *wm8804;
      int i;

      wm8804 = snd_soc_codec_get_drvdata(codec);
      wm8804_set_bias_level(codec, SND_SOC_BIAS_OFF);

      for (i = 0; i < ARRAY_SIZE(wm8804->supplies); ++i)
            regulator_unregister_notifier(wm8804->supplies[i].consumer,
                                    &wm8804->disable_nb[i]);
      regulator_bulk_free(ARRAY_SIZE(wm8804->supplies), wm8804->supplies);
      return 0;
}

static int wm8804_probe(struct snd_soc_codec *codec)
{
      struct wm8804_priv *wm8804;
      int i, id1, id2, ret;

      wm8804 = snd_soc_codec_get_drvdata(codec);
      wm8804->codec = codec;

      codec->dapm.idle_bias_off = 1;

      ret = snd_soc_codec_set_cache_io(codec, 8, 8, wm8804->control_type);
      if (ret < 0) {
            dev_err(codec->dev, "Failed to set cache i/o: %d\n", ret);
            return ret;
      }

      for (i = 0; i < ARRAY_SIZE(wm8804->supplies); i++)
            wm8804->supplies[i].supply = wm8804_supply_names[i];

      ret = regulator_bulk_get(codec->dev, ARRAY_SIZE(wm8804->supplies),
                         wm8804->supplies);
      if (ret) {
            dev_err(codec->dev, "Failed to request supplies: %d\n", ret);
            return ret;
      }

      wm8804->disable_nb[0].notifier_call = wm8804_regulator_event_0;
      wm8804->disable_nb[1].notifier_call = wm8804_regulator_event_1;

      /* This should really be moved into the regulator core */
      for (i = 0; i < ARRAY_SIZE(wm8804->supplies); i++) {
            ret = regulator_register_notifier(wm8804->supplies[i].consumer,
                                      &wm8804->disable_nb[i]);
            if (ret != 0) {
                  dev_err(codec->dev,
                        "Failed to register regulator notifier: %d\n",
                        ret);
            }
      }

      ret = regulator_bulk_enable(ARRAY_SIZE(wm8804->supplies),
                            wm8804->supplies);
      if (ret) {
            dev_err(codec->dev, "Failed to enable supplies: %d\n", ret);
            goto err_reg_get;
      }

      id1 = snd_soc_read(codec, WM8804_RST_DEVID1);
      if (id1 < 0) {
            dev_err(codec->dev, "Failed to read device ID: %d\n", id1);
            ret = id1;
            goto err_reg_enable;
      }

      id2 = snd_soc_read(codec, WM8804_DEVID2);
      if (id2 < 0) {
            dev_err(codec->dev, "Failed to read device ID: %d\n", id2);
            ret = id2;
            goto err_reg_enable;
      }

      id2 = (id2 << 8) | id1;

      if (id2 != ((wm8804_reg_defs[WM8804_DEVID2] << 8)
                  | wm8804_reg_defs[WM8804_RST_DEVID1])) {
            dev_err(codec->dev, "Invalid device ID: %#x\n", id2);
            ret = -EINVAL;
            goto err_reg_enable;
      }

      ret = snd_soc_read(codec, WM8804_DEVREV);
      if (ret < 0) {
            dev_err(codec->dev, "Failed to read device revision: %d\n",
                  ret);
            goto err_reg_enable;
      }
      dev_info(codec->dev, "revision %c\n", ret + 'A');

      ret = wm8804_reset(codec);
      if (ret < 0) {
            dev_err(codec->dev, "Failed to issue reset: %d\n", ret);
            goto err_reg_enable;
      }

      wm8804_set_bias_level(codec, SND_SOC_BIAS_STANDBY);

      snd_soc_add_controls(codec, wm8804_snd_controls,
                       ARRAY_SIZE(wm8804_snd_controls));
      return 0;

err_reg_enable:
      regulator_bulk_disable(ARRAY_SIZE(wm8804->supplies), wm8804->supplies);
err_reg_get:
      regulator_bulk_free(ARRAY_SIZE(wm8804->supplies), wm8804->supplies);
      return ret;
}

static struct snd_soc_dai_ops wm8804_dai_ops = {
      .hw_params = wm8804_hw_params,
      .set_fmt = wm8804_set_fmt,
      .set_sysclk = wm8804_set_sysclk,
      .set_clkdiv = wm8804_set_clkdiv,
      .set_pll = wm8804_set_pll
};

#define WM8804_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE | \
                  SNDRV_PCM_FMTBIT_S24_LE)

static struct snd_soc_dai_driver wm8804_dai = {
      .name = "wm8804-spdif",
      .playback = {
            .stream_name = "Playback",
            .channels_min = 2,
            .channels_max = 2,
            .rates = SNDRV_PCM_RATE_8000_192000,
            .formats = WM8804_FORMATS,
      },
      .capture = {
            .stream_name = "Capture",
            .channels_min = 2,
            .channels_max = 2,
            .rates = SNDRV_PCM_RATE_8000_192000,
            .formats = WM8804_FORMATS,
      },
      .ops = &wm8804_dai_ops,
      .symmetric_rates = 1
};

static struct snd_soc_codec_driver soc_codec_dev_wm8804 = {
      .probe = wm8804_probe,
      .remove = wm8804_remove,
      .suspend = wm8804_suspend,
      .resume = wm8804_resume,
      .set_bias_level = wm8804_set_bias_level,
      .reg_cache_size = ARRAY_SIZE(wm8804_reg_defs),
      .reg_word_size = sizeof(u8),
      .reg_cache_default = wm8804_reg_defs,
      .volatile_register = wm8804_volatile
};

#if defined(CONFIG_SPI_MASTER)
static int __devinit wm8804_spi_probe(struct spi_device *spi)
{
      struct wm8804_priv *wm8804;
      int ret;

      wm8804 = kzalloc(sizeof *wm8804, GFP_KERNEL);
      if (!wm8804)
            return -ENOMEM;

      wm8804->control_type = SND_SOC_SPI;
      spi_set_drvdata(spi, wm8804);

      ret = snd_soc_register_codec(&spi->dev,
                             &soc_codec_dev_wm8804, &wm8804_dai, 1);
      if (ret < 0)
            kfree(wm8804);
      return ret;
}

static int __devexit wm8804_spi_remove(struct spi_device *spi)
{
      snd_soc_unregister_codec(&spi->dev);
      kfree(spi_get_drvdata(spi));
      return 0;
}

static struct spi_driver wm8804_spi_driver = {
      .driver = {
            .name = "wm8804",
            .owner = THIS_MODULE,
      },
      .probe = wm8804_spi_probe,
      .remove = __devexit_p(wm8804_spi_remove)
};
#endif

#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
static __devinit int wm8804_i2c_probe(struct i2c_client *i2c,
                              const struct i2c_device_id *id)
{
      struct wm8804_priv *wm8804;
      int ret;

      wm8804 = kzalloc(sizeof *wm8804, GFP_KERNEL);
      if (!wm8804)
            return -ENOMEM;

      wm8804->control_type = SND_SOC_I2C;
      i2c_set_clientdata(i2c, wm8804);

      ret = snd_soc_register_codec(&i2c->dev,
                             &soc_codec_dev_wm8804, &wm8804_dai, 1);
      if (ret < 0)
            kfree(wm8804);
      return ret;
}

static __devexit int wm8804_i2c_remove(struct i2c_client *client)
{
      snd_soc_unregister_codec(&client->dev);
      kfree(i2c_get_clientdata(client));
      return 0;
}

static const struct i2c_device_id wm8804_i2c_id[] = {
      { "wm8804", 0 },
      { }
};
MODULE_DEVICE_TABLE(i2c, wm8804_i2c_id);

static struct i2c_driver wm8804_i2c_driver = {
      .driver = {
            .name = "wm8804",
            .owner = THIS_MODULE,
      },
      .probe = wm8804_i2c_probe,
      .remove = __devexit_p(wm8804_i2c_remove),
      .id_table = wm8804_i2c_id
};
#endif

static int __init wm8804_modinit(void)
{
      int ret = 0;

#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
      ret = i2c_add_driver(&wm8804_i2c_driver);
      if (ret) {
            printk(KERN_ERR "Failed to register wm8804 I2C driver: %d\n",
                   ret);
      }
#endif
#if defined(CONFIG_SPI_MASTER)
      ret = spi_register_driver(&wm8804_spi_driver);
      if (ret != 0) {
            printk(KERN_ERR "Failed to register wm8804 SPI driver: %d\n",
                   ret);
      }
#endif
      return ret;
}
module_init(wm8804_modinit);

static void __exit wm8804_exit(void)
{
#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
      i2c_del_driver(&wm8804_i2c_driver);
#endif
#if defined(CONFIG_SPI_MASTER)
      spi_unregister_driver(&wm8804_spi_driver);
#endif
}
module_exit(wm8804_exit);

MODULE_DESCRIPTION("ASoC WM8804 driver");
MODULE_AUTHOR("Dimitris Papastamos <dp@opensource.wolfsonmicro.com>");
MODULE_LICENSE("GPL");

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