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wm8971.c

/*
 * wm8971.c  --  WM8971 ALSA SoC Audio driver
 *
 * Copyright 2005 Lab126, Inc.
 *
 * Author: Kenneth Kiraly <kiraly@lab126.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 as published by the
 *  Free Software Foundation;  either version 2 of the  License, or (at your
 *  option) any later version.
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/pm.h>
#include <linux/i2c.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/initval.h>

#include "wm8971.h"

#define     WM8971_REG_COUNT        43

static struct workqueue_struct *wm8971_workq = NULL;

/* codec private data */
00037 struct wm8971_priv {
      enum snd_soc_control_type control_type;
      unsigned int sysclk;
};

/*
 * wm8971 register cache
 * We can't read the WM8971 register space when we
 * are using 2 wire for device control, so we cache them instead.
 */
static const u16 wm8971_reg[] = {
      0x0097, 0x0097, 0x0079, 0x0079,  /*  0 */
      0x0000, 0x0008, 0x0000, 0x000a,  /*  4 */
      0x0000, 0x0000, 0x00ff, 0x00ff,  /*  8 */
      0x000f, 0x000f, 0x0000, 0x0000,  /* 12 */
      0x0000, 0x007b, 0x0000, 0x0032,  /* 16 */
      0x0000, 0x00c3, 0x00c3, 0x00c0,  /* 20 */
      0x0000, 0x0000, 0x0000, 0x0000,  /* 24 */
      0x0000, 0x0000, 0x0000, 0x0000,  /* 28 */
      0x0000, 0x0000, 0x0050, 0x0050,  /* 32 */
      0x0050, 0x0050, 0x0050, 0x0050,  /* 36 */
      0x0079, 0x0079, 0x0079,          /* 40 */
};

#define wm8971_reset(c) snd_soc_write(c, WM8971_RESET, 0)

/* WM8971 Controls */
static const char *wm8971_bass[] = { "Linear Control", "Adaptive Boost" };
static const char *wm8971_bass_filter[] = { "130Hz @ 48kHz",
      "200Hz @ 48kHz" };
static const char *wm8971_treble[] = { "8kHz", "4kHz" };
static const char *wm8971_alc_func[] = { "Off", "Right", "Left", "Stereo" };
static const char *wm8971_ng_type[] = { "Constant PGA Gain",
      "Mute ADC Output" };
static const char *wm8971_deemp[] = { "None", "32kHz", "44.1kHz", "48kHz" };
static const char *wm8971_mono_mux[] = {"Stereo", "Mono (Left)",
      "Mono (Right)", "Digital Mono"};
static const char *wm8971_dac_phase[] = { "Non Inverted", "Inverted" };
static const char *wm8971_lline_mux[] = {"Line", "NC", "NC", "PGA",
      "Differential"};
static const char *wm8971_rline_mux[] = {"Line", "Mic", "NC", "PGA",
      "Differential"};
static const char *wm8971_lpga_sel[] = {"Line", "NC", "NC", "Differential"};
static const char *wm8971_rpga_sel[] = {"Line", "Mic", "NC", "Differential"};
static const char *wm8971_adcpol[] = {"Normal", "L Invert", "R Invert",
      "L + R Invert"};

static const struct soc_enum wm8971_enum[] = {
      SOC_ENUM_SINGLE(WM8971_BASS, 7, 2, wm8971_bass),      /* 0 */
      SOC_ENUM_SINGLE(WM8971_BASS, 6, 2, wm8971_bass_filter),
      SOC_ENUM_SINGLE(WM8971_TREBLE, 6, 2, wm8971_treble),
      SOC_ENUM_SINGLE(WM8971_ALC1, 7, 4, wm8971_alc_func),
      SOC_ENUM_SINGLE(WM8971_NGATE, 1, 2, wm8971_ng_type),    /* 4 */
      SOC_ENUM_SINGLE(WM8971_ADCDAC, 1, 4, wm8971_deemp),
      SOC_ENUM_SINGLE(WM8971_ADCTL1, 4, 4, wm8971_mono_mux),
      SOC_ENUM_SINGLE(WM8971_ADCTL1, 1, 2, wm8971_dac_phase),
      SOC_ENUM_SINGLE(WM8971_LOUTM1, 0, 5, wm8971_lline_mux), /* 8 */
      SOC_ENUM_SINGLE(WM8971_ROUTM1, 0, 5, wm8971_rline_mux),
      SOC_ENUM_SINGLE(WM8971_LADCIN, 6, 4, wm8971_lpga_sel),
      SOC_ENUM_SINGLE(WM8971_RADCIN, 6, 4, wm8971_rpga_sel),
      SOC_ENUM_SINGLE(WM8971_ADCDAC, 5, 4, wm8971_adcpol),    /* 12 */
      SOC_ENUM_SINGLE(WM8971_ADCIN, 6, 4, wm8971_mono_mux),
};

static const struct snd_kcontrol_new wm8971_snd_controls[] = {
      SOC_DOUBLE_R("Capture Volume", WM8971_LINVOL, WM8971_RINVOL, 0, 63, 0),
      SOC_DOUBLE_R("Capture ZC Switch", WM8971_LINVOL, WM8971_RINVOL,
                 6, 1, 0),
      SOC_DOUBLE_R("Capture Switch", WM8971_LINVOL, WM8971_RINVOL, 7, 1, 1),

      SOC_DOUBLE_R("Headphone Playback ZC Switch", WM8971_LOUT1V,
            WM8971_ROUT1V, 7, 1, 0),
      SOC_DOUBLE_R("Speaker Playback ZC Switch", WM8971_LOUT2V,
            WM8971_ROUT2V, 7, 1, 0),
      SOC_SINGLE("Mono Playback ZC Switch", WM8971_MOUTV, 7, 1, 0),

      SOC_DOUBLE_R("PCM Volume", WM8971_LDAC, WM8971_RDAC, 0, 255, 0),

      SOC_DOUBLE_R("Bypass Left Playback Volume", WM8971_LOUTM1,
            WM8971_LOUTM2, 4, 7, 1),
      SOC_DOUBLE_R("Bypass Right Playback Volume", WM8971_ROUTM1,
            WM8971_ROUTM2, 4, 7, 1),
      SOC_DOUBLE_R("Bypass Mono Playback Volume", WM8971_MOUTM1,
            WM8971_MOUTM2, 4, 7, 1),

      SOC_DOUBLE_R("Headphone Playback Volume", WM8971_LOUT1V,
            WM8971_ROUT1V, 0, 127, 0),
      SOC_DOUBLE_R("Speaker Playback Volume", WM8971_LOUT2V,
            WM8971_ROUT2V, 0, 127, 0),

      SOC_ENUM("Bass Boost", wm8971_enum[0]),
      SOC_ENUM("Bass Filter", wm8971_enum[1]),
      SOC_SINGLE("Bass Volume", WM8971_BASS, 0, 7, 1),

      SOC_SINGLE("Treble Volume", WM8971_TREBLE, 0, 7, 0),
      SOC_ENUM("Treble Cut-off", wm8971_enum[2]),

      SOC_SINGLE("Capture Filter Switch", WM8971_ADCDAC, 0, 1, 1),

      SOC_SINGLE("ALC Target Volume", WM8971_ALC1, 0, 7, 0),
      SOC_SINGLE("ALC Max Volume", WM8971_ALC1, 4, 7, 0),

      SOC_SINGLE("ALC Capture Target Volume", WM8971_ALC1, 0, 7, 0),
      SOC_SINGLE("ALC Capture Max Volume", WM8971_ALC1, 4, 7, 0),
      SOC_ENUM("ALC Capture Function", wm8971_enum[3]),
      SOC_SINGLE("ALC Capture ZC Switch", WM8971_ALC2, 7, 1, 0),
      SOC_SINGLE("ALC Capture Hold Time", WM8971_ALC2, 0, 15, 0),
      SOC_SINGLE("ALC Capture Decay Time", WM8971_ALC3, 4, 15, 0),
      SOC_SINGLE("ALC Capture Attack Time", WM8971_ALC3, 0, 15, 0),
      SOC_SINGLE("ALC Capture NG Threshold", WM8971_NGATE, 3, 31, 0),
      SOC_ENUM("ALC Capture NG Type", wm8971_enum[4]),
      SOC_SINGLE("ALC Capture NG Switch", WM8971_NGATE, 0, 1, 0),

      SOC_SINGLE("Capture 6dB Attenuate", WM8971_ADCDAC, 8, 1, 0),
      SOC_SINGLE("Playback 6dB Attenuate", WM8971_ADCDAC, 7, 1, 0),

      SOC_ENUM("Playback De-emphasis", wm8971_enum[5]),
      SOC_ENUM("Playback Function", wm8971_enum[6]),
      SOC_ENUM("Playback Phase", wm8971_enum[7]),

      SOC_DOUBLE_R("Mic Boost", WM8971_LADCIN, WM8971_RADCIN, 4, 3, 0),
};

/*
 * DAPM Controls
 */

/* Left Mixer */
static const struct snd_kcontrol_new wm8971_left_mixer_controls[] = {
SOC_DAPM_SINGLE("Playback Switch", WM8971_LOUTM1, 8, 1, 0),
SOC_DAPM_SINGLE("Left Bypass Switch", WM8971_LOUTM1, 7, 1, 0),
SOC_DAPM_SINGLE("Right Playback Switch", WM8971_LOUTM2, 8, 1, 0),
SOC_DAPM_SINGLE("Right Bypass Switch", WM8971_LOUTM2, 7, 1, 0),
};

/* Right Mixer */
static const struct snd_kcontrol_new wm8971_right_mixer_controls[] = {
SOC_DAPM_SINGLE("Left Playback Switch", WM8971_ROUTM1, 8, 1, 0),
SOC_DAPM_SINGLE("Left Bypass Switch", WM8971_ROUTM1, 7, 1, 0),
SOC_DAPM_SINGLE("Playback Switch", WM8971_ROUTM2, 8, 1, 0),
SOC_DAPM_SINGLE("Right Bypass Switch", WM8971_ROUTM2, 7, 1, 0),
};

/* Mono Mixer */
static const struct snd_kcontrol_new wm8971_mono_mixer_controls[] = {
SOC_DAPM_SINGLE("Left Playback Switch", WM8971_MOUTM1, 8, 1, 0),
SOC_DAPM_SINGLE("Left Bypass Switch", WM8971_MOUTM1, 7, 1, 0),
SOC_DAPM_SINGLE("Right Playback Switch", WM8971_MOUTM2, 8, 1, 0),
SOC_DAPM_SINGLE("Right Bypass Switch", WM8971_MOUTM2, 7, 1, 0),
};

/* Left Line Mux */
static const struct snd_kcontrol_new wm8971_left_line_controls =
SOC_DAPM_ENUM("Route", wm8971_enum[8]);

/* Right Line Mux */
static const struct snd_kcontrol_new wm8971_right_line_controls =
SOC_DAPM_ENUM("Route", wm8971_enum[9]);

/* Left PGA Mux */
static const struct snd_kcontrol_new wm8971_left_pga_controls =
SOC_DAPM_ENUM("Route", wm8971_enum[10]);

/* Right PGA Mux */
static const struct snd_kcontrol_new wm8971_right_pga_controls =
SOC_DAPM_ENUM("Route", wm8971_enum[11]);

/* Mono ADC Mux */
static const struct snd_kcontrol_new wm8971_monomux_controls =
SOC_DAPM_ENUM("Route", wm8971_enum[13]);

static const struct snd_soc_dapm_widget wm8971_dapm_widgets[] = {
      SND_SOC_DAPM_MIXER("Left Mixer", SND_SOC_NOPM, 0, 0,
            &wm8971_left_mixer_controls[0],
            ARRAY_SIZE(wm8971_left_mixer_controls)),
      SND_SOC_DAPM_MIXER("Right Mixer", SND_SOC_NOPM, 0, 0,
            &wm8971_right_mixer_controls[0],
            ARRAY_SIZE(wm8971_right_mixer_controls)),
      SND_SOC_DAPM_MIXER("Mono Mixer", WM8971_PWR2, 2, 0,
            &wm8971_mono_mixer_controls[0],
            ARRAY_SIZE(wm8971_mono_mixer_controls)),

      SND_SOC_DAPM_PGA("Right Out 2", WM8971_PWR2, 3, 0, NULL, 0),
      SND_SOC_DAPM_PGA("Left Out 2", WM8971_PWR2, 4, 0, NULL, 0),
      SND_SOC_DAPM_PGA("Right Out 1", WM8971_PWR2, 5, 0, NULL, 0),
      SND_SOC_DAPM_PGA("Left Out 1", WM8971_PWR2, 6, 0, NULL, 0),
      SND_SOC_DAPM_DAC("Right DAC", "Right Playback", WM8971_PWR2, 7, 0),
      SND_SOC_DAPM_DAC("Left DAC", "Left Playback", WM8971_PWR2, 8, 0),
      SND_SOC_DAPM_PGA("Mono Out 1", WM8971_PWR2, 2, 0, NULL, 0),

      SND_SOC_DAPM_MICBIAS("Mic Bias", WM8971_PWR1, 1, 0),
      SND_SOC_DAPM_ADC("Right ADC", "Right Capture", WM8971_PWR1, 2, 0),
      SND_SOC_DAPM_ADC("Left ADC", "Left Capture", WM8971_PWR1, 3, 0),

      SND_SOC_DAPM_MUX("Left PGA Mux", WM8971_PWR1, 5, 0,
            &wm8971_left_pga_controls),
      SND_SOC_DAPM_MUX("Right PGA Mux", WM8971_PWR1, 4, 0,
            &wm8971_right_pga_controls),
      SND_SOC_DAPM_MUX("Left Line Mux", SND_SOC_NOPM, 0, 0,
            &wm8971_left_line_controls),
      SND_SOC_DAPM_MUX("Right Line Mux", SND_SOC_NOPM, 0, 0,
            &wm8971_right_line_controls),

      SND_SOC_DAPM_MUX("Left ADC Mux", SND_SOC_NOPM, 0, 0,
            &wm8971_monomux_controls),
      SND_SOC_DAPM_MUX("Right ADC Mux", SND_SOC_NOPM, 0, 0,
            &wm8971_monomux_controls),

      SND_SOC_DAPM_OUTPUT("LOUT1"),
      SND_SOC_DAPM_OUTPUT("ROUT1"),
      SND_SOC_DAPM_OUTPUT("LOUT2"),
      SND_SOC_DAPM_OUTPUT("ROUT2"),
      SND_SOC_DAPM_OUTPUT("MONO"),

      SND_SOC_DAPM_INPUT("LINPUT1"),
      SND_SOC_DAPM_INPUT("RINPUT1"),
      SND_SOC_DAPM_INPUT("MIC"),
};

static const struct snd_soc_dapm_route audio_map[] = {
      /* left mixer */
      {"Left Mixer", "Playback Switch", "Left DAC"},
      {"Left Mixer", "Left Bypass Switch", "Left Line Mux"},
      {"Left Mixer", "Right Playback Switch", "Right DAC"},
      {"Left Mixer", "Right Bypass Switch", "Right Line Mux"},

      /* right mixer */
      {"Right Mixer", "Left Playback Switch", "Left DAC"},
      {"Right Mixer", "Left Bypass Switch", "Left Line Mux"},
      {"Right Mixer", "Playback Switch", "Right DAC"},
      {"Right Mixer", "Right Bypass Switch", "Right Line Mux"},

      /* left out 1 */
      {"Left Out 1", NULL, "Left Mixer"},
      {"LOUT1", NULL, "Left Out 1"},

      /* left out 2 */
      {"Left Out 2", NULL, "Left Mixer"},
      {"LOUT2", NULL, "Left Out 2"},

      /* right out 1 */
      {"Right Out 1", NULL, "Right Mixer"},
      {"ROUT1", NULL, "Right Out 1"},

      /* right out 2 */
      {"Right Out 2", NULL, "Right Mixer"},
      {"ROUT2", NULL, "Right Out 2"},

      /* mono mixer */
      {"Mono Mixer", "Left Playback Switch", "Left DAC"},
      {"Mono Mixer", "Left Bypass Switch", "Left Line Mux"},
      {"Mono Mixer", "Right Playback Switch", "Right DAC"},
      {"Mono Mixer", "Right Bypass Switch", "Right Line Mux"},

      /* mono out */
      {"Mono Out", NULL, "Mono Mixer"},
      {"MONO1", NULL, "Mono Out"},

      /* Left Line Mux */
      {"Left Line Mux", "Line", "LINPUT1"},
      {"Left Line Mux", "PGA", "Left PGA Mux"},
      {"Left Line Mux", "Differential", "Differential Mux"},

      /* Right Line Mux */
      {"Right Line Mux", "Line", "RINPUT1"},
      {"Right Line Mux", "Mic", "MIC"},
      {"Right Line Mux", "PGA", "Right PGA Mux"},
      {"Right Line Mux", "Differential", "Differential Mux"},

      /* Left PGA Mux */
      {"Left PGA Mux", "Line", "LINPUT1"},
      {"Left PGA Mux", "Differential", "Differential Mux"},

      /* Right PGA Mux */
      {"Right PGA Mux", "Line", "RINPUT1"},
      {"Right PGA Mux", "Differential", "Differential Mux"},

      /* Differential Mux */
      {"Differential Mux", "Line", "LINPUT1"},
      {"Differential Mux", "Line", "RINPUT1"},

      /* Left ADC Mux */
      {"Left ADC Mux", "Stereo", "Left PGA Mux"},
      {"Left ADC Mux", "Mono (Left)", "Left PGA Mux"},
      {"Left ADC Mux", "Digital Mono", "Left PGA Mux"},

      /* Right ADC Mux */
      {"Right ADC Mux", "Stereo", "Right PGA Mux"},
      {"Right ADC Mux", "Mono (Right)", "Right PGA Mux"},
      {"Right ADC Mux", "Digital Mono", "Right PGA Mux"},

      /* ADC */
      {"Left ADC", NULL, "Left ADC Mux"},
      {"Right ADC", NULL, "Right ADC Mux"},
};

static int wm8971_add_widgets(struct snd_soc_codec *codec)
{
      struct snd_soc_dapm_context *dapm = &codec->dapm;

      snd_soc_dapm_new_controls(dapm, wm8971_dapm_widgets,
                          ARRAY_SIZE(wm8971_dapm_widgets));
      snd_soc_dapm_add_routes(dapm, audio_map, ARRAY_SIZE(audio_map));

      return 0;
}

struct _coeff_div {
      u32 mclk;
      u32 rate;
      u16 fs;
      u8 sr:5;
      u8 usb:1;
};

/* codec hifi mclk clock divider coefficients */
static const struct _coeff_div coeff_div[] = {
      /* 8k */
      {12288000, 8000, 1536, 0x6, 0x0},
      {11289600, 8000, 1408, 0x16, 0x0},
      {18432000, 8000, 2304, 0x7, 0x0},
      {16934400, 8000, 2112, 0x17, 0x0},
      {12000000, 8000, 1500, 0x6, 0x1},

      /* 11.025k */
      {11289600, 11025, 1024, 0x18, 0x0},
      {16934400, 11025, 1536, 0x19, 0x0},
      {12000000, 11025, 1088, 0x19, 0x1},

      /* 16k */
      {12288000, 16000, 768, 0xa, 0x0},
      {18432000, 16000, 1152, 0xb, 0x0},
      {12000000, 16000, 750, 0xa, 0x1},

      /* 22.05k */
      {11289600, 22050, 512, 0x1a, 0x0},
      {16934400, 22050, 768, 0x1b, 0x0},
      {12000000, 22050, 544, 0x1b, 0x1},

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

      /* 44.1k */
      {11289600, 44100, 256, 0x10, 0x0},
      {16934400, 44100, 384, 0x11, 0x0},
      {12000000, 44100, 272, 0x11, 0x1},

      /* 48k */
      {12288000, 48000, 256, 0x0, 0x0},
      {18432000, 48000, 384, 0x1, 0x0},
      {12000000, 48000, 250, 0x0, 0x1},

      /* 88.2k */
      {11289600, 88200, 128, 0x1e, 0x0},
      {16934400, 88200, 192, 0x1f, 0x0},
      {12000000, 88200, 136, 0x1f, 0x1},

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

static 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 -EINVAL;
}

static int wm8971_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 wm8971_priv *wm8971 = snd_soc_codec_get_drvdata(codec);

      switch (freq) {
      case 11289600:
      case 12000000:
      case 12288000:
      case 16934400:
      case 18432000:
            wm8971->sysclk = freq;
            return 0;
      }
      return -EINVAL;
}

static int wm8971_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;
      }

      snd_soc_write(codec, WM8971_IFACE, iface);
      return 0;
}

static int wm8971_pcm_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 wm8971_priv *wm8971 = snd_soc_codec_get_drvdata(codec);
      u16 iface = snd_soc_read(codec, WM8971_IFACE) & 0x1f3;
      u16 srate = snd_soc_read(codec, WM8971_SRATE) & 0x1c0;
      int coeff = get_coeff(wm8971->sysclk, params_rate(params));

      /* 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;
      case SNDRV_PCM_FORMAT_S32_LE:
            iface |= 0x000c;
            break;
      }

      /* set iface & srate */
      snd_soc_write(codec, WM8971_IFACE, iface);
      if (coeff >= 0)
            snd_soc_write(codec, WM8971_SRATE, srate |
                  (coeff_div[coeff].sr << 1) | coeff_div[coeff].usb);

      return 0;
}

static int wm8971_mute(struct snd_soc_dai *dai, int mute)
{
      struct snd_soc_codec *codec = dai->codec;
      u16 mute_reg = snd_soc_read(codec, WM8971_ADCDAC) & 0xfff7;

      if (mute)
            snd_soc_write(codec, WM8971_ADCDAC, mute_reg | 0x8);
      else
            snd_soc_write(codec, WM8971_ADCDAC, mute_reg);
      return 0;
}

static int wm8971_set_bias_level(struct snd_soc_codec *codec,
      enum snd_soc_bias_level level)
{
      u16 pwr_reg = snd_soc_read(codec, WM8971_PWR1) & 0xfe3e;

      switch (level) {
      case SND_SOC_BIAS_ON:
            /* set vmid to 50k and unmute dac */
            snd_soc_write(codec, WM8971_PWR1, pwr_reg | 0x00c1);
            break;
      case SND_SOC_BIAS_PREPARE:
            break;
      case SND_SOC_BIAS_STANDBY:
            /* mute dac and set vmid to 500k, enable VREF */
            snd_soc_write(codec, WM8971_PWR1, pwr_reg | 0x0140);
            break;
      case SND_SOC_BIAS_OFF:
            snd_soc_write(codec, WM8971_PWR1, 0x0001);
            break;
      }
      codec->dapm.bias_level = level;
      return 0;
}

#define WM8971_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\
            SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_44100 | \
            SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000)

#define WM8971_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
      SNDRV_PCM_FMTBIT_S24_LE)

static struct snd_soc_dai_ops wm8971_dai_ops = {
      .hw_params  = wm8971_pcm_hw_params,
      .digital_mute     = wm8971_mute,
      .set_fmt    = wm8971_set_dai_fmt,
      .set_sysclk = wm8971_set_dai_sysclk,
};

static struct snd_soc_dai_driver wm8971_dai = {
      .name = "wm8971-hifi",
      .playback = {
            .stream_name = "Playback",
            .channels_min = 1,
            .channels_max = 2,
            .rates = WM8971_RATES,
            .formats = WM8971_FORMATS,},
      .capture = {
            .stream_name = "Capture",
            .channels_min = 1,
            .channels_max = 2,
            .rates = WM8971_RATES,
            .formats = WM8971_FORMATS,},
      .ops = &wm8971_dai_ops,
};

static void wm8971_work(struct work_struct *work)
{
      struct snd_soc_dapm_context *dapm =
            container_of(work, struct snd_soc_dapm_context,
                       delayed_work.work);
      struct snd_soc_codec *codec = dapm->codec;
      wm8971_set_bias_level(codec, codec->dapm.bias_level);
}

static int wm8971_suspend(struct snd_soc_codec *codec, pm_message_t state)
{
      wm8971_set_bias_level(codec, SND_SOC_BIAS_OFF);
      return 0;
}

static int wm8971_resume(struct snd_soc_codec *codec)
{
      int i;
      u8 data[2];
      u16 *cache = codec->reg_cache;
      u16 reg;

      /* Sync reg_cache with the hardware */
      for (i = 0; i < ARRAY_SIZE(wm8971_reg); i++) {
            if (i + 1 == WM8971_RESET)
                  continue;
            data[0] = (i << 1) | ((cache[i] >> 8) & 0x0001);
            data[1] = cache[i] & 0x00ff;
            codec->hw_write(codec->control_data, data, 2);
      }

      wm8971_set_bias_level(codec, SND_SOC_BIAS_STANDBY);

      /* charge wm8971 caps */
      if (codec->dapm.suspend_bias_level == SND_SOC_BIAS_ON) {
            reg = snd_soc_read(codec, WM8971_PWR1) & 0xfe3e;
            snd_soc_write(codec, WM8971_PWR1, reg | 0x01c0);
            codec->dapm.bias_level = SND_SOC_BIAS_ON;
            queue_delayed_work(wm8971_workq, &codec->dapm.delayed_work,
                  msecs_to_jiffies(1000));
      }

      return 0;
}

static int wm8971_probe(struct snd_soc_codec *codec)
{
      struct wm8971_priv *wm8971 = snd_soc_codec_get_drvdata(codec);
      int ret = 0;
      u16 reg;

      ret = snd_soc_codec_set_cache_io(codec, 7, 9, wm8971->control_type);
      if (ret < 0) {
            printk(KERN_ERR "wm8971: failed to set cache I/O: %d\n", ret);
            return ret;
      }

      INIT_DELAYED_WORK(&codec->dapm.delayed_work, wm8971_work);
      wm8971_workq = create_workqueue("wm8971");
      if (wm8971_workq == NULL)
            return -ENOMEM;

      wm8971_reset(codec);

      /* charge output caps - set vmid to 5k for quick power up */
      reg = snd_soc_read(codec, WM8971_PWR1) & 0xfe3e;
      snd_soc_write(codec, WM8971_PWR1, reg | 0x01c0);
      codec->dapm.bias_level = SND_SOC_BIAS_STANDBY;
      queue_delayed_work(wm8971_workq, &codec->dapm.delayed_work,
            msecs_to_jiffies(1000));

      /* set the update bits */
      reg = snd_soc_read(codec, WM8971_LDAC);
      snd_soc_write(codec, WM8971_LDAC, reg | 0x0100);
      reg = snd_soc_read(codec, WM8971_RDAC);
      snd_soc_write(codec, WM8971_RDAC, reg | 0x0100);

      reg = snd_soc_read(codec, WM8971_LOUT1V);
      snd_soc_write(codec, WM8971_LOUT1V, reg | 0x0100);
      reg = snd_soc_read(codec, WM8971_ROUT1V);
      snd_soc_write(codec, WM8971_ROUT1V, reg | 0x0100);

      reg = snd_soc_read(codec, WM8971_LOUT2V);
      snd_soc_write(codec, WM8971_LOUT2V, reg | 0x0100);
      reg = snd_soc_read(codec, WM8971_ROUT2V);
      snd_soc_write(codec, WM8971_ROUT2V, reg | 0x0100);

      reg = snd_soc_read(codec, WM8971_LINVOL);
      snd_soc_write(codec, WM8971_LINVOL, reg | 0x0100);
      reg = snd_soc_read(codec, WM8971_RINVOL);
      snd_soc_write(codec, WM8971_RINVOL, reg | 0x0100);

      snd_soc_add_controls(codec, wm8971_snd_controls,
                        ARRAY_SIZE(wm8971_snd_controls));
      wm8971_add_widgets(codec);

      return ret;
}


/* power down chip */
static int wm8971_remove(struct snd_soc_codec *codec)
{
      wm8971_set_bias_level(codec, SND_SOC_BIAS_OFF);

      if (wm8971_workq)
            destroy_workqueue(wm8971_workq);
      return 0;
}

static struct snd_soc_codec_driver soc_codec_dev_wm8971 = {
      .probe =    wm8971_probe,
      .remove =   wm8971_remove,
      .suspend =  wm8971_suspend,
      .resume =   wm8971_resume,
      .set_bias_level = wm8971_set_bias_level,
      .reg_cache_size = ARRAY_SIZE(wm8971_reg),
      .reg_word_size = sizeof(u16),
      .reg_cache_default = wm8971_reg,
};

#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
static __devinit int wm8971_i2c_probe(struct i2c_client *i2c,
                              const struct i2c_device_id *id)
{
      struct wm8971_priv *wm8971;
      int ret;

      wm8971 = kzalloc(sizeof(struct wm8971_priv), GFP_KERNEL);
      if (wm8971 == NULL)
            return -ENOMEM;

      wm8971->control_type = SND_SOC_I2C;
      i2c_set_clientdata(i2c, wm8971);

      ret = snd_soc_register_codec(&i2c->dev,
                  &soc_codec_dev_wm8971, &wm8971_dai, 1);
      if (ret < 0)
            kfree(wm8971);
      return ret;
}

static __devexit int wm8971_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 wm8971_i2c_id[] = {
      { "wm8971", 0 },
      { }
};
MODULE_DEVICE_TABLE(i2c, wm8971_i2c_id);

static struct i2c_driver wm8971_i2c_driver = {
      .driver = {
            .name = "wm8971-codec",
            .owner = THIS_MODULE,
      },
      .probe =    wm8971_i2c_probe,
      .remove =   __devexit_p(wm8971_i2c_remove),
      .id_table = wm8971_i2c_id,
};
#endif

static int __init wm8971_modinit(void)
{
      int ret = 0;
#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
      ret = i2c_add_driver(&wm8971_i2c_driver);
      if (ret != 0) {
            printk(KERN_ERR "Failed to register WM8971 I2C driver: %d\n",
                   ret);
      }
#endif
      return ret;
}
module_init(wm8971_modinit);

static void __exit wm8971_exit(void)
{
#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
      i2c_del_driver(&wm8971_i2c_driver);
#endif
}
module_exit(wm8971_exit);

MODULE_DESCRIPTION("ASoC WM8971 driver");
MODULE_AUTHOR("Lab126");
MODULE_LICENSE("GPL");

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