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wm8974.c

/*
 * wm8974.c  --  WM8974 ALSA Soc Audio driver
 *
 * Copyright 2006-2009 Wolfson Microelectronics PLC.
 *
 * Author: Liam Girdwood <linux@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/version.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/pm.h>
#include <linux/i2c.h>
#include <linux/platform_device.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/soc-dapm.h>
#include <sound/initval.h>
#include <sound/tlv.h>

#include "wm8974.h"

static const u16 wm8974_reg[WM8974_CACHEREGNUM] = {
      0x0000, 0x0000, 0x0000, 0x0000,
      0x0050, 0x0000, 0x0140, 0x0000,
      0x0000, 0x0000, 0x0000, 0x00ff,
      0x0000, 0x0000, 0x0100, 0x00ff,
      0x0000, 0x0000, 0x012c, 0x002c,
      0x002c, 0x002c, 0x002c, 0x0000,
      0x0032, 0x0000, 0x0000, 0x0000,
      0x0000, 0x0000, 0x0000, 0x0000,
      0x0038, 0x000b, 0x0032, 0x0000,
      0x0008, 0x000c, 0x0093, 0x00e9,
      0x0000, 0x0000, 0x0000, 0x0000,
      0x0003, 0x0010, 0x0000, 0x0000,
      0x0000, 0x0002, 0x0000, 0x0000,
      0x0000, 0x0000, 0x0039, 0x0000,
      0x0000,
};

#define WM8974_POWER1_BIASEN  0x08
#define WM8974_POWER1_BUFIOEN 0x10

struct wm8974_priv {
      struct snd_soc_codec codec;
      u16 reg_cache[WM8974_CACHEREGNUM];
};

static struct snd_soc_codec *wm8974_codec;

#define wm8974_reset(c) snd_soc_write(c, WM8974_RESET, 0)

static const char *wm8974_companding[] = {"Off", "NC", "u-law", "A-law" };
static const char *wm8974_deemp[] = {"None", "32kHz", "44.1kHz", "48kHz" };
static const char *wm8974_eqmode[] = {"Capture", "Playback" };
static const char *wm8974_bw[] = {"Narrow", "Wide" };
static const char *wm8974_eq1[] = {"80Hz", "105Hz", "135Hz", "175Hz" };
static const char *wm8974_eq2[] = {"230Hz", "300Hz", "385Hz", "500Hz" };
static const char *wm8974_eq3[] = {"650Hz", "850Hz", "1.1kHz", "1.4kHz" };
static const char *wm8974_eq4[] = {"1.8kHz", "2.4kHz", "3.2kHz", "4.1kHz" };
static const char *wm8974_eq5[] = {"5.3kHz", "6.9kHz", "9kHz", "11.7kHz" };
static const char *wm8974_alc[] = {"ALC", "Limiter" };

static const struct soc_enum wm8974_enum[] = {
      SOC_ENUM_SINGLE(WM8974_COMP, 1, 4, wm8974_companding), /* adc */
      SOC_ENUM_SINGLE(WM8974_COMP, 3, 4, wm8974_companding), /* dac */
      SOC_ENUM_SINGLE(WM8974_DAC,  4, 4, wm8974_deemp),
      SOC_ENUM_SINGLE(WM8974_EQ1,  8, 2, wm8974_eqmode),

      SOC_ENUM_SINGLE(WM8974_EQ1,  5, 4, wm8974_eq1),
      SOC_ENUM_SINGLE(WM8974_EQ2,  8, 2, wm8974_bw),
      SOC_ENUM_SINGLE(WM8974_EQ2,  5, 4, wm8974_eq2),
      SOC_ENUM_SINGLE(WM8974_EQ3,  8, 2, wm8974_bw),

      SOC_ENUM_SINGLE(WM8974_EQ3,  5, 4, wm8974_eq3),
      SOC_ENUM_SINGLE(WM8974_EQ4,  8, 2, wm8974_bw),
      SOC_ENUM_SINGLE(WM8974_EQ4,  5, 4, wm8974_eq4),
      SOC_ENUM_SINGLE(WM8974_EQ5,  8, 2, wm8974_bw),

      SOC_ENUM_SINGLE(WM8974_EQ5,  5, 4, wm8974_eq5),
      SOC_ENUM_SINGLE(WM8974_ALC3,  8, 2, wm8974_alc),
};

static const char *wm8974_auxmode_text[] = { "Buffer", "Mixer" };

static const struct soc_enum wm8974_auxmode =
      SOC_ENUM_SINGLE(WM8974_INPUT,  3, 2, wm8974_auxmode_text);

static const DECLARE_TLV_DB_SCALE(digital_tlv, -12750, 50, 1);
static const DECLARE_TLV_DB_SCALE(eq_tlv, -1200, 100, 0);
static const DECLARE_TLV_DB_SCALE(inpga_tlv, -1200, 75, 0);
static const DECLARE_TLV_DB_SCALE(spk_tlv, -5700, 100, 0);

static const struct snd_kcontrol_new wm8974_snd_controls[] = {

SOC_SINGLE("Digital Loopback Switch", WM8974_COMP, 0, 1, 0),

SOC_ENUM("DAC Companding", wm8974_enum[1]),
SOC_ENUM("ADC Companding", wm8974_enum[0]),

SOC_ENUM("Playback De-emphasis", wm8974_enum[2]),
SOC_SINGLE("DAC Inversion Switch", WM8974_DAC, 0, 1, 0),

SOC_SINGLE_TLV("PCM Volume", WM8974_DACVOL, 0, 255, 0, digital_tlv),

SOC_SINGLE("High Pass Filter Switch", WM8974_ADC, 8, 1, 0),
SOC_SINGLE("High Pass Cut Off", WM8974_ADC, 4, 7, 0),
SOC_SINGLE("ADC Inversion Switch", WM8974_ADC, 0, 1, 0),

SOC_SINGLE_TLV("Capture Volume", WM8974_ADCVOL,  0, 255, 0, digital_tlv),

SOC_ENUM("Equaliser Function", wm8974_enum[3]),
SOC_ENUM("EQ1 Cut Off", wm8974_enum[4]),
SOC_SINGLE_TLV("EQ1 Volume", WM8974_EQ1,  0, 24, 1, eq_tlv),

SOC_ENUM("Equaliser EQ2 Bandwith", wm8974_enum[5]),
SOC_ENUM("EQ2 Cut Off", wm8974_enum[6]),
SOC_SINGLE_TLV("EQ2 Volume", WM8974_EQ2,  0, 24, 1, eq_tlv),

SOC_ENUM("Equaliser EQ3 Bandwith", wm8974_enum[7]),
SOC_ENUM("EQ3 Cut Off", wm8974_enum[8]),
SOC_SINGLE_TLV("EQ3 Volume", WM8974_EQ3,  0, 24, 1, eq_tlv),

SOC_ENUM("Equaliser EQ4 Bandwith", wm8974_enum[9]),
SOC_ENUM("EQ4 Cut Off", wm8974_enum[10]),
SOC_SINGLE_TLV("EQ4 Volume", WM8974_EQ4,  0, 24, 1, eq_tlv),

SOC_ENUM("Equaliser EQ5 Bandwith", wm8974_enum[11]),
SOC_ENUM("EQ5 Cut Off", wm8974_enum[12]),
SOC_SINGLE_TLV("EQ5 Volume", WM8974_EQ5,  0, 24, 1, eq_tlv),

SOC_SINGLE("DAC Playback Limiter Switch", WM8974_DACLIM1,  8, 1, 0),
SOC_SINGLE("DAC Playback Limiter Decay", WM8974_DACLIM1,  4, 15, 0),
SOC_SINGLE("DAC Playback Limiter Attack", WM8974_DACLIM1,  0, 15, 0),

SOC_SINGLE("DAC Playback Limiter Threshold", WM8974_DACLIM2,  4, 7, 0),
SOC_SINGLE("DAC Playback Limiter Boost", WM8974_DACLIM2,  0, 15, 0),

SOC_SINGLE("ALC Enable Switch", WM8974_ALC1,  8, 1, 0),
SOC_SINGLE("ALC Capture Max Gain", WM8974_ALC1,  3, 7, 0),
SOC_SINGLE("ALC Capture Min Gain", WM8974_ALC1,  0, 7, 0),

SOC_SINGLE("ALC Capture ZC Switch", WM8974_ALC2,  8, 1, 0),
SOC_SINGLE("ALC Capture Hold", WM8974_ALC2,  4, 7, 0),
SOC_SINGLE("ALC Capture Target", WM8974_ALC2,  0, 15, 0),

SOC_ENUM("ALC Capture Mode", wm8974_enum[13]),
SOC_SINGLE("ALC Capture Decay", WM8974_ALC3,  4, 15, 0),
SOC_SINGLE("ALC Capture Attack", WM8974_ALC3,  0, 15, 0),

SOC_SINGLE("ALC Capture Noise Gate Switch", WM8974_NGATE,  3, 1, 0),
SOC_SINGLE("ALC Capture Noise Gate Threshold", WM8974_NGATE,  0, 7, 0),

SOC_SINGLE("Capture PGA ZC Switch", WM8974_INPPGA,  7, 1, 0),
SOC_SINGLE_TLV("Capture PGA Volume", WM8974_INPPGA,  0, 63, 0, inpga_tlv),

SOC_SINGLE("Speaker Playback ZC Switch", WM8974_SPKVOL,  7, 1, 0),
SOC_SINGLE("Speaker Playback Switch", WM8974_SPKVOL,  6, 1, 1),
SOC_SINGLE_TLV("Speaker Playback Volume", WM8974_SPKVOL,  0, 63, 0, spk_tlv),

SOC_ENUM("Aux Mode", wm8974_auxmode),

SOC_SINGLE("Capture Boost(+20dB)", WM8974_ADCBOOST,  8, 1, 0),
SOC_SINGLE("Mono Playback Switch", WM8974_MONOMIX, 6, 1, 1),
};

/* Speaker Output Mixer */
static const struct snd_kcontrol_new wm8974_speaker_mixer_controls[] = {
SOC_DAPM_SINGLE("Line Bypass Switch", WM8974_SPKMIX, 1, 1, 0),
SOC_DAPM_SINGLE("Aux Playback Switch", WM8974_SPKMIX, 5, 1, 0),
SOC_DAPM_SINGLE("PCM Playback Switch", WM8974_SPKMIX, 0, 1, 1),
};

/* Mono Output Mixer */
static const struct snd_kcontrol_new wm8974_mono_mixer_controls[] = {
SOC_DAPM_SINGLE("Line Bypass Switch", WM8974_MONOMIX, 1, 1, 0),
SOC_DAPM_SINGLE("Aux Playback Switch", WM8974_MONOMIX, 2, 1, 0),
SOC_DAPM_SINGLE("PCM Playback Switch", WM8974_MONOMIX, 0, 1, 0),
};

/* Boost mixer */
static const struct snd_kcontrol_new wm8974_boost_mixer[] = {
SOC_DAPM_SINGLE("Aux Switch", WM8974_INPPGA, 6, 1, 0),
};

/* Input PGA */
static const struct snd_kcontrol_new wm8974_inpga[] = {
SOC_DAPM_SINGLE("Aux Switch", WM8974_INPUT, 2, 1, 0),
SOC_DAPM_SINGLE("MicN Switch", WM8974_INPUT, 1, 1, 0),
SOC_DAPM_SINGLE("MicP Switch", WM8974_INPUT, 0, 1, 0),
};

/* AUX Input boost vol */
static const struct snd_kcontrol_new wm8974_aux_boost_controls =
SOC_DAPM_SINGLE("Aux Volume", WM8974_ADCBOOST, 0, 7, 0);

/* Mic Input boost vol */
static const struct snd_kcontrol_new wm8974_mic_boost_controls =
SOC_DAPM_SINGLE("Mic Volume", WM8974_ADCBOOST, 4, 7, 0);

static const struct snd_soc_dapm_widget wm8974_dapm_widgets[] = {
SND_SOC_DAPM_MIXER("Speaker Mixer", WM8974_POWER3, 2, 0,
      &wm8974_speaker_mixer_controls[0],
      ARRAY_SIZE(wm8974_speaker_mixer_controls)),
SND_SOC_DAPM_MIXER("Mono Mixer", WM8974_POWER3, 3, 0,
      &wm8974_mono_mixer_controls[0],
      ARRAY_SIZE(wm8974_mono_mixer_controls)),
SND_SOC_DAPM_DAC("DAC", "HiFi Playback", WM8974_POWER3, 0, 0),
SND_SOC_DAPM_ADC("ADC", "HiFi Capture", WM8974_POWER2, 0, 0),
SND_SOC_DAPM_PGA("Aux Input", WM8974_POWER1, 6, 0, NULL, 0),
SND_SOC_DAPM_PGA("SpkN Out", WM8974_POWER3, 5, 0, NULL, 0),
SND_SOC_DAPM_PGA("SpkP Out", WM8974_POWER3, 6, 0, NULL, 0),
SND_SOC_DAPM_PGA("Mono Out", WM8974_POWER3, 7, 0, NULL, 0),

SND_SOC_DAPM_MIXER("Input PGA", WM8974_POWER2, 2, 0, wm8974_inpga,
               ARRAY_SIZE(wm8974_inpga)),
SND_SOC_DAPM_MIXER("Boost Mixer", WM8974_POWER2, 4, 0,
               wm8974_boost_mixer, ARRAY_SIZE(wm8974_boost_mixer)),

SND_SOC_DAPM_MICBIAS("Mic Bias", WM8974_POWER1, 4, 0),

SND_SOC_DAPM_INPUT("MICN"),
SND_SOC_DAPM_INPUT("MICP"),
SND_SOC_DAPM_INPUT("AUX"),
SND_SOC_DAPM_OUTPUT("MONOOUT"),
SND_SOC_DAPM_OUTPUT("SPKOUTP"),
SND_SOC_DAPM_OUTPUT("SPKOUTN"),
};

static const struct snd_soc_dapm_route audio_map[] = {
      /* Mono output mixer */
      {"Mono Mixer", "PCM Playback Switch", "DAC"},
      {"Mono Mixer", "Aux Playback Switch", "Aux Input"},
      {"Mono Mixer", "Line Bypass Switch", "Boost Mixer"},

      /* Speaker output mixer */
      {"Speaker Mixer", "PCM Playback Switch", "DAC"},
      {"Speaker Mixer", "Aux Playback Switch", "Aux Input"},
      {"Speaker Mixer", "Line Bypass Switch", "Boost Mixer"},

      /* Outputs */
      {"Mono Out", NULL, "Mono Mixer"},
      {"MONOOUT", NULL, "Mono Out"},
      {"SpkN Out", NULL, "Speaker Mixer"},
      {"SpkP Out", NULL, "Speaker Mixer"},
      {"SPKOUTN", NULL, "SpkN Out"},
      {"SPKOUTP", NULL, "SpkP Out"},

      /* Boost Mixer */
      {"ADC", NULL, "Boost Mixer"},
      {"Boost Mixer", "Aux Switch", "Aux Input"},
      {"Boost Mixer", NULL, "Input PGA"},
      {"Boost Mixer", NULL, "MICP"},

      /* Input PGA */
      {"Input PGA", "Aux Switch", "Aux Input"},
      {"Input PGA", "MicN Switch", "MICN"},
      {"Input PGA", "MicP Switch", "MICP"},

      /* Inputs */
      {"Aux Input", NULL, "AUX"},
};

static int wm8974_add_widgets(struct snd_soc_codec *codec)
{
      snd_soc_dapm_new_controls(codec, wm8974_dapm_widgets,
                          ARRAY_SIZE(wm8974_dapm_widgets));

      snd_soc_dapm_add_routes(codec, audio_map, ARRAY_SIZE(audio_map));

      snd_soc_dapm_new_widgets(codec);
      return 0;
}

struct pll_ {
      unsigned int pre_div:4; /* prescale - 1 */
      unsigned int n:4;
      unsigned int k;
};

static struct pll_ pll_div;

/* The size in bits of the pll divide multiplied by 10
 * to allow rounding later */
#define FIXED_PLL_SIZE ((1 << 24) * 10)

static void pll_factors(unsigned int target, unsigned int source)
{
      unsigned long long Kpart;
      unsigned int K, Ndiv, Nmod;

      Ndiv = target / source;
      if (Ndiv < 6) {
            source >>= 1;
            pll_div.pre_div = 1;
            Ndiv = target / source;
      } else
            pll_div.pre_div = 0;

      if ((Ndiv < 6) || (Ndiv > 12))
            printk(KERN_WARNING
                  "WM8974 N value %u outwith recommended range!\n",
                  Ndiv);

      pll_div.n = Ndiv;
      Nmod = target % source;
      Kpart = FIXED_PLL_SIZE * (long long)Nmod;

      do_div(Kpart, source);

      K = Kpart & 0xFFFFFFFF;

      /* Check if we need to round */
      if ((K % 10) >= 5)
            K += 5;

      /* Move down to proper range now rounding is done */
      K /= 10;

      pll_div.k = K;
}

static int wm8974_set_dai_pll(struct snd_soc_dai *codec_dai,
            int pll_id, unsigned int freq_in, unsigned int freq_out)
{
      struct snd_soc_codec *codec = codec_dai->codec;
      u16 reg;

      if (freq_in == 0 || freq_out == 0) {
            /* Clock CODEC directly from MCLK */
            reg = snd_soc_read(codec, WM8974_CLOCK);
            snd_soc_write(codec, WM8974_CLOCK, reg & 0x0ff);

            /* Turn off PLL */
            reg = snd_soc_read(codec, WM8974_POWER1);
            snd_soc_write(codec, WM8974_POWER1, reg & 0x1df);
            return 0;
      }

      pll_factors(freq_out*4, freq_in);

      snd_soc_write(codec, WM8974_PLLN, (pll_div.pre_div << 4) | pll_div.n);
      snd_soc_write(codec, WM8974_PLLK1, pll_div.k >> 18);
      snd_soc_write(codec, WM8974_PLLK2, (pll_div.k >> 9) & 0x1ff);
      snd_soc_write(codec, WM8974_PLLK3, pll_div.k & 0x1ff);
      reg = snd_soc_read(codec, WM8974_POWER1);
      snd_soc_write(codec, WM8974_POWER1, reg | 0x020);

      /* Run CODEC from PLL instead of MCLK */
      reg = snd_soc_read(codec, WM8974_CLOCK);
      snd_soc_write(codec, WM8974_CLOCK, reg | 0x100);

      return 0;
}

/*
 * Configure WM8974 clock dividers.
 */
static int wm8974_set_dai_clkdiv(struct snd_soc_dai *codec_dai,
            int div_id, int div)
{
      struct snd_soc_codec *codec = codec_dai->codec;
      u16 reg;

      switch (div_id) {
      case WM8974_OPCLKDIV:
            reg = snd_soc_read(codec, WM8974_GPIO) & 0x1cf;
            snd_soc_write(codec, WM8974_GPIO, reg | div);
            break;
      case WM8974_MCLKDIV:
            reg = snd_soc_read(codec, WM8974_CLOCK) & 0x11f;
            snd_soc_write(codec, WM8974_CLOCK, reg | div);
            break;
      case WM8974_ADCCLK:
            reg = snd_soc_read(codec, WM8974_ADC) & 0x1f7;
            snd_soc_write(codec, WM8974_ADC, reg | div);
            break;
      case WM8974_DACCLK:
            reg = snd_soc_read(codec, WM8974_DAC) & 0x1f7;
            snd_soc_write(codec, WM8974_DAC, reg | div);
            break;
      case WM8974_BCLKDIV:
            reg = snd_soc_read(codec, WM8974_CLOCK) & 0x1e3;
            snd_soc_write(codec, WM8974_CLOCK, reg | div);
            break;
      default:
            return -EINVAL;
      }

      return 0;
}

static int wm8974_set_dai_fmt(struct snd_soc_dai *codec_dai,
            unsigned int fmt)
{
      struct snd_soc_codec *codec = codec_dai->codec;
      u16 iface = 0;
      u16 clk = snd_soc_read(codec, WM8974_CLOCK) & 0x1fe;

      /* set master/slave audio interface */
      switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
      case SND_SOC_DAIFMT_CBM_CFM:
            clk |= 0x0001;
            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 |= 0x0010;
            break;
      case SND_SOC_DAIFMT_RIGHT_J:
            break;
      case SND_SOC_DAIFMT_LEFT_J:
            iface |= 0x0008;
            break;
      case SND_SOC_DAIFMT_DSP_A:
            iface |= 0x00018;
            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 |= 0x0180;
            break;
      case SND_SOC_DAIFMT_IB_NF:
            iface |= 0x0100;
            break;
      case SND_SOC_DAIFMT_NB_IF:
            iface |= 0x0080;
            break;
      default:
            return -EINVAL;
      }

      snd_soc_write(codec, WM8974_IFACE, iface);
      snd_soc_write(codec, WM8974_CLOCK, clk);
      return 0;
}

static int wm8974_pcm_hw_params(struct snd_pcm_substream *substream,
                        struct snd_pcm_hw_params *params,
                        struct snd_soc_dai *dai)
{
      struct snd_soc_codec *codec = dai->codec;
      u16 iface = snd_soc_read(codec, WM8974_IFACE) & 0x19f;
      u16 adn = snd_soc_read(codec, WM8974_ADD) & 0x1f1;

      /* bit size */
      switch (params_format(params)) {
      case SNDRV_PCM_FORMAT_S16_LE:
            break;
      case SNDRV_PCM_FORMAT_S20_3LE:
            iface |= 0x0020;
            break;
      case SNDRV_PCM_FORMAT_S24_LE:
            iface |= 0x0040;
            break;
      case SNDRV_PCM_FORMAT_S32_LE:
            iface |= 0x0060;
            break;
      }

      /* filter coefficient */
      switch (params_rate(params)) {
      case SNDRV_PCM_RATE_8000:
            adn |= 0x5 << 1;
            break;
      case SNDRV_PCM_RATE_11025:
            adn |= 0x4 << 1;
            break;
      case SNDRV_PCM_RATE_16000:
            adn |= 0x3 << 1;
            break;
      case SNDRV_PCM_RATE_22050:
            adn |= 0x2 << 1;
            break;
      case SNDRV_PCM_RATE_32000:
            adn |= 0x1 << 1;
            break;
      case SNDRV_PCM_RATE_44100:
      case SNDRV_PCM_RATE_48000:
            break;
      }

      snd_soc_write(codec, WM8974_IFACE, iface);
      snd_soc_write(codec, WM8974_ADD, adn);
      return 0;
}

static int wm8974_mute(struct snd_soc_dai *dai, int mute)
{
      struct snd_soc_codec *codec = dai->codec;
      u16 mute_reg = snd_soc_read(codec, WM8974_DAC) & 0xffbf;

      if (mute)
            snd_soc_write(codec, WM8974_DAC, mute_reg | 0x40);
      else
            snd_soc_write(codec, WM8974_DAC, mute_reg);
      return 0;
}

/* liam need to make this lower power with dapm */
static int wm8974_set_bias_level(struct snd_soc_codec *codec,
      enum snd_soc_bias_level level)
{
      u16 power1 = snd_soc_read(codec, WM8974_POWER1) & ~0x3;

      switch (level) {
      case SND_SOC_BIAS_ON:
      case SND_SOC_BIAS_PREPARE:
            power1 |= 0x1;  /* VMID 50k */
            snd_soc_write(codec, WM8974_POWER1, power1);
            break;

      case SND_SOC_BIAS_STANDBY:
            power1 |= WM8974_POWER1_BIASEN | WM8974_POWER1_BUFIOEN;

            if (codec->bias_level == SND_SOC_BIAS_OFF) {
                  /* Initial cap charge at VMID 5k */
                  snd_soc_write(codec, WM8974_POWER1, power1 | 0x3);
                  mdelay(100);
            }

            power1 |= 0x2;  /* VMID 500k */
            snd_soc_write(codec, WM8974_POWER1, power1);
            break;

      case SND_SOC_BIAS_OFF:
            snd_soc_write(codec, WM8974_POWER1, 0);
            snd_soc_write(codec, WM8974_POWER2, 0);
            snd_soc_write(codec, WM8974_POWER3, 0);
            break;
      }

      codec->bias_level = level;
      return 0;
}

#define WM8974_RATES (SNDRV_PCM_RATE_8000_48000)

#define WM8974_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
      SNDRV_PCM_FMTBIT_S24_LE)

static struct snd_soc_dai_ops wm8974_ops = {
      .hw_params = wm8974_pcm_hw_params,
      .digital_mute = wm8974_mute,
      .set_fmt = wm8974_set_dai_fmt,
      .set_clkdiv = wm8974_set_dai_clkdiv,
      .set_pll = wm8974_set_dai_pll,
};

struct snd_soc_dai wm8974_dai = {
      .name = "WM8974 HiFi",
      .playback = {
            .stream_name = "Playback",
            .channels_min = 1,
            .channels_max = 2,   /* Only 1 channel of data */
            .rates = WM8974_RATES,
            .formats = WM8974_FORMATS,},
      .capture = {
            .stream_name = "Capture",
            .channels_min = 1,
            .channels_max = 2,   /* Only 1 channel of data */
            .rates = WM8974_RATES,
            .formats = WM8974_FORMATS,},
      .ops = &wm8974_ops,
      .symmetric_rates = 1,
};
EXPORT_SYMBOL_GPL(wm8974_dai);

static int wm8974_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;

      wm8974_set_bias_level(codec, SND_SOC_BIAS_OFF);
      return 0;
}

static int wm8974_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(wm8974_reg); i++) {
            data[0] = (i << 1) | ((cache[i] >> 8) & 0x0001);
            data[1] = cache[i] & 0x00ff;
            codec->hw_write(codec->control_data, data, 2);
      }
      wm8974_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
      wm8974_set_bias_level(codec, codec->suspend_bias_level);
      return 0;
}

static int wm8974_probe(struct platform_device *pdev)
{
      struct snd_soc_device *socdev = platform_get_drvdata(pdev);
      struct snd_soc_codec *codec;
      int ret = 0;

      if (wm8974_codec == NULL) {
            dev_err(&pdev->dev, "Codec device not registered\n");
            return -ENODEV;
      }

      socdev->card->codec = wm8974_codec;
      codec = wm8974_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, wm8974_snd_controls,
                       ARRAY_SIZE(wm8974_snd_controls));
      wm8974_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 wm8974_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_wm8974 = {
      .probe =    wm8974_probe,
      .remove =   wm8974_remove,
      .suspend =  wm8974_suspend,
      .resume =   wm8974_resume,
};
EXPORT_SYMBOL_GPL(soc_codec_dev_wm8974);

static __devinit int wm8974_register(struct wm8974_priv *wm8974)
{
      int ret;
      struct snd_soc_codec *codec = &wm8974->codec;

      if (wm8974_codec) {
            dev_err(codec->dev, "Another WM8974 is registered\n");
            return -EINVAL;
      }

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

      codec->private_data = wm8974;
      codec->name = "WM8974";
      codec->owner = THIS_MODULE;
      codec->bias_level = SND_SOC_BIAS_OFF;
      codec->set_bias_level = wm8974_set_bias_level;
      codec->dai = &wm8974_dai;
      codec->num_dai = 1;
      codec->reg_cache_size = WM8974_CACHEREGNUM;
      codec->reg_cache = &wm8974->reg_cache;

      ret = snd_soc_codec_set_cache_io(codec, 7, 9, SND_SOC_I2C);
      if (ret < 0) {
            dev_err(codec->dev, "Failed to set cache I/O: %d\n", ret);
            goto err;
      }

      memcpy(codec->reg_cache, wm8974_reg, sizeof(wm8974_reg));

      ret = wm8974_reset(codec);
      if (ret < 0) {
            dev_err(codec->dev, "Failed to issue reset\n");
            goto err;
      }

      wm8974_dai.dev = codec->dev;

      wm8974_set_bias_level(codec, SND_SOC_BIAS_STANDBY);

      wm8974_codec = codec;

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

      ret = snd_soc_register_dai(&wm8974_dai);
      if (ret != 0) {
            dev_err(codec->dev, "Failed to register DAI: %d\n", ret);
            goto err_codec;
      }

      return 0;

err_codec:
      snd_soc_unregister_codec(codec);
err:
      kfree(wm8974);
      return ret;
}

static __devexit void wm8974_unregister(struct wm8974_priv *wm8974)
{
      wm8974_set_bias_level(&wm8974->codec, SND_SOC_BIAS_OFF);
      snd_soc_unregister_dai(&wm8974_dai);
      snd_soc_unregister_codec(&wm8974->codec);
      kfree(wm8974);
      wm8974_codec = NULL;
}

static __devinit int wm8974_i2c_probe(struct i2c_client *i2c,
                              const struct i2c_device_id *id)
{
      struct wm8974_priv *wm8974;
      struct snd_soc_codec *codec;

      wm8974 = kzalloc(sizeof(struct wm8974_priv), GFP_KERNEL);
      if (wm8974 == NULL)
            return -ENOMEM;

      codec = &wm8974->codec;
      codec->hw_write = (hw_write_t)i2c_master_send;

      i2c_set_clientdata(i2c, wm8974);
      codec->control_data = i2c;

      codec->dev = &i2c->dev;

      return wm8974_register(wm8974);
}

static __devexit int wm8974_i2c_remove(struct i2c_client *client)
{
      struct wm8974_priv *wm8974 = i2c_get_clientdata(client);
      wm8974_unregister(wm8974);
      return 0;
}

static const struct i2c_device_id wm8974_i2c_id[] = {
      { "wm8974", 0 },
      { }
};
MODULE_DEVICE_TABLE(i2c, wm8974_i2c_id);

static struct i2c_driver wm8974_i2c_driver = {
      .driver = {
            .name = "WM8974",
            .owner = THIS_MODULE,
      },
      .probe =    wm8974_i2c_probe,
      .remove =   __devexit_p(wm8974_i2c_remove),
      .id_table = wm8974_i2c_id,
};

static int __init wm8974_modinit(void)
{
      return i2c_add_driver(&wm8974_i2c_driver);
}
module_init(wm8974_modinit);

static void __exit wm8974_exit(void)
{
      i2c_del_driver(&wm8974_i2c_driver);
}
module_exit(wm8974_exit);

MODULE_DESCRIPTION("ASoC WM8974 driver");
MODULE_AUTHOR("Liam Girdwood");
MODULE_LICENSE("GPL");

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