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wm8988.c

/*
 * wm8988.c -- WM8988 ALSA SoC audio driver
 *
 * Copyright 2009 Wolfson Microelectronics plc
 * Copyright 2005 Openedhand Ltd.
 *
 * Author: Mark Brown <broonie@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/platform_device.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/tlv.h>
#include <sound/soc.h>
#include <sound/soc-dapm.h>
#include <sound/initval.h>

#include "wm8988.h"

/*
 * wm8988 register cache
 * We can't read the WM8988 register space when we
 * are using 2 wire for device control, so we cache them instead.
 */
static const u16 wm8988_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 */
};

/* codec private data */
struct wm8988_priv {
      unsigned int sysclk;
      struct snd_soc_codec codec;
      struct snd_pcm_hw_constraint_list *sysclk_constraints;
      u16 reg_cache[WM8988_NUM_REG];
};


#define wm8988_reset(c) snd_soc_write(c, WM8988_RESET, 0)

/*
 * WM8988 Controls
 */

static const char *bass_boost_txt[] = {"Linear Control", "Adaptive Boost"};
static const struct soc_enum bass_boost =
      SOC_ENUM_SINGLE(WM8988_BASS, 7, 2, bass_boost_txt);

static const char *bass_filter_txt[] = { "130Hz @ 48kHz", "200Hz @ 48kHz" };
static const struct soc_enum bass_filter =
      SOC_ENUM_SINGLE(WM8988_BASS, 6, 2, bass_filter_txt);

static const char *treble_txt[] = {"8kHz", "4kHz"};
static const struct soc_enum treble =
      SOC_ENUM_SINGLE(WM8988_TREBLE, 6, 2, treble_txt);

static const char *stereo_3d_lc_txt[] = {"200Hz", "500Hz"};
static const struct soc_enum stereo_3d_lc =
      SOC_ENUM_SINGLE(WM8988_3D, 5, 2, stereo_3d_lc_txt);

static const char *stereo_3d_uc_txt[] = {"2.2kHz", "1.5kHz"};
static const struct soc_enum stereo_3d_uc =
      SOC_ENUM_SINGLE(WM8988_3D, 6, 2, stereo_3d_uc_txt);

static const char *stereo_3d_func_txt[] = {"Capture", "Playback"};
static const struct soc_enum stereo_3d_func =
      SOC_ENUM_SINGLE(WM8988_3D, 7, 2, stereo_3d_func_txt);

static const char *alc_func_txt[] = {"Off", "Right", "Left", "Stereo"};
static const struct soc_enum alc_func =
      SOC_ENUM_SINGLE(WM8988_ALC1, 7, 4, alc_func_txt);

static const char *ng_type_txt[] = {"Constant PGA Gain",
                            "Mute ADC Output"};
static const struct soc_enum ng_type =
      SOC_ENUM_SINGLE(WM8988_NGATE, 1, 2, ng_type_txt);

static const char *deemph_txt[] = {"None", "32Khz", "44.1Khz", "48Khz"};
static const struct soc_enum deemph =
      SOC_ENUM_SINGLE(WM8988_ADCDAC, 1, 4, deemph_txt);

static const char *adcpol_txt[] = {"Normal", "L Invert", "R Invert",
                           "L + R Invert"};
static const struct soc_enum adcpol =
      SOC_ENUM_SINGLE(WM8988_ADCDAC, 5, 4, adcpol_txt);

static const DECLARE_TLV_DB_SCALE(pga_tlv, -1725, 75, 0);
static const DECLARE_TLV_DB_SCALE(adc_tlv, -9750, 50, 1);
static const DECLARE_TLV_DB_SCALE(dac_tlv, -12750, 50, 1);
static const DECLARE_TLV_DB_SCALE(out_tlv, -12100, 100, 1);
static const DECLARE_TLV_DB_SCALE(bypass_tlv, -1500, 300, 0);

static const struct snd_kcontrol_new wm8988_snd_controls[] = {

SOC_ENUM("Bass Boost", bass_boost),
SOC_ENUM("Bass Filter", bass_filter),
SOC_SINGLE("Bass Volume", WM8988_BASS, 0, 15, 1),

SOC_SINGLE("Treble Volume", WM8988_TREBLE, 0, 15, 0),
SOC_ENUM("Treble Cut-off", treble),

SOC_SINGLE("3D Switch", WM8988_3D, 0, 1, 0),
SOC_SINGLE("3D Volume", WM8988_3D, 1, 15, 0),
SOC_ENUM("3D Lower Cut-off", stereo_3d_lc),
SOC_ENUM("3D Upper Cut-off", stereo_3d_uc),
SOC_ENUM("3D Mode", stereo_3d_func),

SOC_SINGLE("ALC Capture Target Volume", WM8988_ALC1, 0, 7, 0),
SOC_SINGLE("ALC Capture Max Volume", WM8988_ALC1, 4, 7, 0),
SOC_ENUM("ALC Capture Function", alc_func),
SOC_SINGLE("ALC Capture ZC Switch", WM8988_ALC2, 7, 1, 0),
SOC_SINGLE("ALC Capture Hold Time", WM8988_ALC2, 0, 15, 0),
SOC_SINGLE("ALC Capture Decay Time", WM8988_ALC3, 4, 15, 0),
SOC_SINGLE("ALC Capture Attack Time", WM8988_ALC3, 0, 15, 0),
SOC_SINGLE("ALC Capture NG Threshold", WM8988_NGATE, 3, 31, 0),
SOC_ENUM("ALC Capture NG Type", ng_type),
SOC_SINGLE("ALC Capture NG Switch", WM8988_NGATE, 0, 1, 0),

SOC_SINGLE("ZC Timeout Switch", WM8988_ADCTL1, 0, 1, 0),

SOC_DOUBLE_R_TLV("Capture Digital Volume", WM8988_LADC, WM8988_RADC,
             0, 255, 0, adc_tlv),
SOC_DOUBLE_R_TLV("Capture Volume", WM8988_LINVOL, WM8988_RINVOL,
             0, 63, 0, pga_tlv),
SOC_DOUBLE_R("Capture ZC Switch", WM8988_LINVOL, WM8988_RINVOL, 6, 1, 0),
SOC_DOUBLE_R("Capture Switch", WM8988_LINVOL, WM8988_RINVOL, 7, 1, 1),

SOC_ENUM("Playback De-emphasis", deemph),

SOC_ENUM("Capture Polarity", adcpol),
SOC_SINGLE("Playback 6dB Attenuate", WM8988_ADCDAC, 7, 1, 0),
SOC_SINGLE("Capture 6dB Attenuate", WM8988_ADCDAC, 8, 1, 0),

SOC_DOUBLE_R_TLV("PCM Volume", WM8988_LDAC, WM8988_RDAC, 0, 255, 0, dac_tlv),

SOC_SINGLE_TLV("Left Mixer Left Bypass Volume", WM8988_LOUTM1, 4, 7, 1,
             bypass_tlv),
SOC_SINGLE_TLV("Left Mixer Right Bypass Volume", WM8988_LOUTM2, 4, 7, 1,
             bypass_tlv),
SOC_SINGLE_TLV("Right Mixer Left Bypass Volume", WM8988_ROUTM1, 4, 7, 1,
             bypass_tlv),
SOC_SINGLE_TLV("Right Mixer Right Bypass Volume", WM8988_ROUTM2, 4, 7, 1,
             bypass_tlv),

SOC_DOUBLE_R("Output 1 Playback ZC Switch", WM8988_LOUT1V,
           WM8988_ROUT1V, 7, 1, 0),
SOC_DOUBLE_R_TLV("Output 1 Playback Volume", WM8988_LOUT1V, WM8988_ROUT1V,
             0, 127, 0, out_tlv),

SOC_DOUBLE_R("Output 2 Playback ZC Switch", WM8988_LOUT2V,
           WM8988_ROUT2V, 7, 1, 0),
SOC_DOUBLE_R_TLV("Output 2 Playback Volume", WM8988_LOUT2V, WM8988_ROUT2V,
             0, 127, 0, out_tlv),

};

/*
 * DAPM Controls
 */

static int wm8988_lrc_control(struct snd_soc_dapm_widget *w,
                        struct snd_kcontrol *kcontrol, int event)
{
      struct snd_soc_codec *codec = w->codec;
      u16 adctl2 = snd_soc_read(codec, WM8988_ADCTL2);

      /* Use the DAC to gate LRC if active, otherwise use ADC */
      if (snd_soc_read(codec, WM8988_PWR2) & 0x180)
            adctl2 &= ~0x4;
      else
            adctl2 |= 0x4;

      return snd_soc_write(codec, WM8988_ADCTL2, adctl2);
}

static const char *wm8988_line_texts[] = {
      "Line 1", "Line 2", "PGA", "Differential"};

static const unsigned int wm8988_line_values[] = {
      0, 1, 3, 4};

static const struct soc_enum wm8988_lline_enum =
      SOC_VALUE_ENUM_SINGLE(WM8988_LOUTM1, 0, 7,
                        ARRAY_SIZE(wm8988_line_texts),
                        wm8988_line_texts,
                        wm8988_line_values);
static const struct snd_kcontrol_new wm8988_left_line_controls =
      SOC_DAPM_VALUE_ENUM("Route", wm8988_lline_enum);

static const struct soc_enum wm8988_rline_enum =
      SOC_VALUE_ENUM_SINGLE(WM8988_ROUTM1, 0, 7,
                        ARRAY_SIZE(wm8988_line_texts),
                        wm8988_line_texts,
                        wm8988_line_values);
static const struct snd_kcontrol_new wm8988_right_line_controls =
      SOC_DAPM_VALUE_ENUM("Route", wm8988_lline_enum);

/* Left Mixer */
static const struct snd_kcontrol_new wm8988_left_mixer_controls[] = {
      SOC_DAPM_SINGLE("Playback Switch", WM8988_LOUTM1, 8, 1, 0),
      SOC_DAPM_SINGLE("Left Bypass Switch", WM8988_LOUTM1, 7, 1, 0),
      SOC_DAPM_SINGLE("Right Playback Switch", WM8988_LOUTM2, 8, 1, 0),
      SOC_DAPM_SINGLE("Right Bypass Switch", WM8988_LOUTM2, 7, 1, 0),
};

/* Right Mixer */
static const struct snd_kcontrol_new wm8988_right_mixer_controls[] = {
      SOC_DAPM_SINGLE("Left Playback Switch", WM8988_ROUTM1, 8, 1, 0),
      SOC_DAPM_SINGLE("Left Bypass Switch", WM8988_ROUTM1, 7, 1, 0),
      SOC_DAPM_SINGLE("Playback Switch", WM8988_ROUTM2, 8, 1, 0),
      SOC_DAPM_SINGLE("Right Bypass Switch", WM8988_ROUTM2, 7, 1, 0),
};

static const char *wm8988_pga_sel[] = {"Line 1", "Line 2", "Differential"};
static const unsigned int wm8988_pga_val[] = { 0, 1, 3 };

/* Left PGA Mux */
static const struct soc_enum wm8988_lpga_enum =
      SOC_VALUE_ENUM_SINGLE(WM8988_LADCIN, 6, 3,
                        ARRAY_SIZE(wm8988_pga_sel),
                        wm8988_pga_sel,
                        wm8988_pga_val);
static const struct snd_kcontrol_new wm8988_left_pga_controls =
      SOC_DAPM_VALUE_ENUM("Route", wm8988_lpga_enum);

/* Right PGA Mux */
static const struct soc_enum wm8988_rpga_enum =
      SOC_VALUE_ENUM_SINGLE(WM8988_RADCIN, 6, 3,
                        ARRAY_SIZE(wm8988_pga_sel),
                        wm8988_pga_sel,
                        wm8988_pga_val);
static const struct snd_kcontrol_new wm8988_right_pga_controls =
      SOC_DAPM_VALUE_ENUM("Route", wm8988_rpga_enum);

/* Differential Mux */
static const char *wm8988_diff_sel[] = {"Line 1", "Line 2"};
static const struct soc_enum diffmux =
      SOC_ENUM_SINGLE(WM8988_ADCIN, 8, 2, wm8988_diff_sel);
static const struct snd_kcontrol_new wm8988_diffmux_controls =
      SOC_DAPM_ENUM("Route", diffmux);

/* Mono ADC Mux */
static const char *wm8988_mono_mux[] = {"Stereo", "Mono (Left)",
      "Mono (Right)", "Digital Mono"};
static const struct soc_enum monomux =
      SOC_ENUM_SINGLE(WM8988_ADCIN, 6, 4, wm8988_mono_mux);
static const struct snd_kcontrol_new wm8988_monomux_controls =
      SOC_DAPM_ENUM("Route", monomux);

static const struct snd_soc_dapm_widget wm8988_dapm_widgets[] = {
      SND_SOC_DAPM_MICBIAS("Mic Bias", WM8988_PWR1, 1, 0),

      SND_SOC_DAPM_MUX("Differential Mux", SND_SOC_NOPM, 0, 0,
            &wm8988_diffmux_controls),
      SND_SOC_DAPM_MUX("Left ADC Mux", SND_SOC_NOPM, 0, 0,
            &wm8988_monomux_controls),
      SND_SOC_DAPM_MUX("Right ADC Mux", SND_SOC_NOPM, 0, 0,
            &wm8988_monomux_controls),

      SND_SOC_DAPM_MUX("Left PGA Mux", WM8988_PWR1, 5, 0,
            &wm8988_left_pga_controls),
      SND_SOC_DAPM_MUX("Right PGA Mux", WM8988_PWR1, 4, 0,
            &wm8988_right_pga_controls),

      SND_SOC_DAPM_MUX("Left Line Mux", SND_SOC_NOPM, 0, 0,
            &wm8988_left_line_controls),
      SND_SOC_DAPM_MUX("Right Line Mux", SND_SOC_NOPM, 0, 0,
            &wm8988_right_line_controls),

      SND_SOC_DAPM_ADC("Right ADC", "Right Capture", WM8988_PWR1, 2, 0),
      SND_SOC_DAPM_ADC("Left ADC", "Left Capture", WM8988_PWR1, 3, 0),

      SND_SOC_DAPM_DAC("Right DAC", "Right Playback", WM8988_PWR2, 7, 0),
      SND_SOC_DAPM_DAC("Left DAC", "Left Playback", WM8988_PWR2, 8, 0),

      SND_SOC_DAPM_MIXER("Left Mixer", SND_SOC_NOPM, 0, 0,
            &wm8988_left_mixer_controls[0],
            ARRAY_SIZE(wm8988_left_mixer_controls)),
      SND_SOC_DAPM_MIXER("Right Mixer", SND_SOC_NOPM, 0, 0,
            &wm8988_right_mixer_controls[0],
            ARRAY_SIZE(wm8988_right_mixer_controls)),

      SND_SOC_DAPM_PGA("Right Out 2", WM8988_PWR2, 3, 0, NULL, 0),
      SND_SOC_DAPM_PGA("Left Out 2", WM8988_PWR2, 4, 0, NULL, 0),
      SND_SOC_DAPM_PGA("Right Out 1", WM8988_PWR2, 5, 0, NULL, 0),
      SND_SOC_DAPM_PGA("Left Out 1", WM8988_PWR2, 6, 0, NULL, 0),

      SND_SOC_DAPM_POST("LRC control", wm8988_lrc_control),

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

      SND_SOC_DAPM_INPUT("LINPUT1"),
      SND_SOC_DAPM_INPUT("LINPUT2"),
      SND_SOC_DAPM_INPUT("RINPUT1"),
      SND_SOC_DAPM_INPUT("RINPUT2"),
};

static const struct snd_soc_dapm_route audio_map[] = {

      { "Left Line Mux", "Line 1", "LINPUT1" },
      { "Left Line Mux", "Line 2", "LINPUT2" },
      { "Left Line Mux", "PGA", "Left PGA Mux" },
      { "Left Line Mux", "Differential", "Differential Mux" },

      { "Right Line Mux", "Line 1", "RINPUT1" },
      { "Right Line Mux", "Line 2", "RINPUT2" },
      { "Right Line Mux", "PGA", "Right PGA Mux" },
      { "Right Line Mux", "Differential", "Differential Mux" },

      { "Left PGA Mux", "Line 1", "LINPUT1" },
      { "Left PGA Mux", "Line 2", "LINPUT2" },
      { "Left PGA Mux", "Differential", "Differential Mux" },

      { "Right PGA Mux", "Line 1", "RINPUT1" },
      { "Right PGA Mux", "Line 2", "RINPUT2" },
      { "Right PGA Mux", "Differential", "Differential Mux" },

      { "Differential Mux", "Line 1", "LINPUT1" },
      { "Differential Mux", "Line 1", "RINPUT1" },
      { "Differential Mux", "Line 2", "LINPUT2" },
      { "Differential Mux", "Line 2", "RINPUT2" },

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

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

      { "Left Line Mux", "Line 1", "LINPUT1" },
      { "Left Line Mux", "Line 2", "LINPUT2" },
      { "Left Line Mux", "PGA", "Left PGA Mux" },
      { "Left Line Mux", "Differential", "Differential Mux" },

      { "Right Line Mux", "Line 1", "RINPUT1" },
      { "Right Line Mux", "Line 2", "RINPUT2" },
      { "Right Line Mux", "PGA", "Right PGA Mux" },
      { "Right Line Mux", "Differential", "Differential Mux" },

      { "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", "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", NULL, "Left Mixer" },
      { "LOUT1", NULL, "Left Out 1" },
      { "Right Out 1", NULL, "Right Mixer" },
      { "ROUT1", NULL, "Right Out 1" },

      { "Left Out 2", NULL, "Left Mixer" },
      { "LOUT2", NULL, "Left Out 2" },
      { "Right Out 2", NULL, "Right Mixer" },
      { "ROUT2", NULL, "Right Out 2" },
};

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 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 -EINVAL;
}

/* The set of rates we can generate from the above for each SYSCLK */

static unsigned int rates_12288[] = {
      8000, 12000, 16000, 24000, 24000, 32000, 48000, 96000,
};

static struct snd_pcm_hw_constraint_list constraints_12288 = {
      .count      = ARRAY_SIZE(rates_12288),
      .list = rates_12288,
};

static unsigned int rates_112896[] = {
      8000, 11025, 22050, 44100,
};

static struct snd_pcm_hw_constraint_list constraints_112896 = {
      .count      = ARRAY_SIZE(rates_112896),
      .list = rates_112896,
};

static unsigned int rates_12[] = {
      8000, 11025, 12000, 16000, 22050, 2400, 32000, 41100, 48000,
      48000, 88235, 96000,
};

static struct snd_pcm_hw_constraint_list constraints_12 = {
      .count      = ARRAY_SIZE(rates_12),
      .list = rates_12,
};

/*
 * Note that this should be called from init rather than from hw_params.
 */
static int wm8988_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 wm8988_priv *wm8988 = codec->private_data;

      switch (freq) {
      case 11289600:
      case 18432000:
      case 22579200:
      case 36864000:
            wm8988->sysclk_constraints = &constraints_112896;
            wm8988->sysclk = freq;
            return 0;

      case 12288000:
      case 16934400:
      case 24576000:
      case 33868800:
            wm8988->sysclk_constraints = &constraints_12288;
            wm8988->sysclk = freq;
            return 0;

      case 12000000:
      case 24000000:
            wm8988->sysclk_constraints = &constraints_12;
            wm8988->sysclk = freq;
            return 0;
      }
      return -EINVAL;
}

static int wm8988_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, WM8988_IFACE, iface);
      return 0;
}

static int wm8988_pcm_startup(struct snd_pcm_substream *substream,
                        struct snd_soc_dai *dai)
{
      struct snd_soc_codec *codec = dai->codec;
      struct wm8988_priv *wm8988 = codec->private_data;

      /* The set of sample rates that can be supported depends on the
       * MCLK supplied to the CODEC - enforce this.
       */
      if (!wm8988->sysclk) {
            dev_err(codec->dev,
                  "No MCLK configured, call set_sysclk() on init\n");
            return -EINVAL;
      }

      snd_pcm_hw_constraint_list(substream->runtime, 0,
                           SNDRV_PCM_HW_PARAM_RATE,
                           wm8988->sysclk_constraints);

      return 0;
}

static int wm8988_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_device *socdev = rtd->socdev;
      struct snd_soc_codec *codec = socdev->card->codec;
      struct wm8988_priv *wm8988 = codec->private_data;
      u16 iface = snd_soc_read(codec, WM8988_IFACE) & 0x1f3;
      u16 srate = snd_soc_read(codec, WM8988_SRATE) & 0x180;
      int coeff;

      coeff = get_coeff(wm8988->sysclk, params_rate(params));
      if (coeff < 0) {
            coeff = get_coeff(wm8988->sysclk / 2, params_rate(params));
            srate |= 0x40;
      }
      if (coeff < 0) {
            dev_err(codec->dev,
                  "Unable to configure sample rate %dHz with %dHz MCLK\n",
                  params_rate(params), wm8988->sysclk);
            return coeff;
      }

      /* 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, WM8988_IFACE, iface);
      if (coeff >= 0)
            snd_soc_write(codec, WM8988_SRATE, srate |
                  (coeff_div[coeff].sr << 1) | coeff_div[coeff].usb);

      return 0;
}

static int wm8988_mute(struct snd_soc_dai *dai, int mute)
{
      struct snd_soc_codec *codec = dai->codec;
      u16 mute_reg = snd_soc_read(codec, WM8988_ADCDAC) & 0xfff7;

      if (mute)
            snd_soc_write(codec, WM8988_ADCDAC, mute_reg | 0x8);
      else
            snd_soc_write(codec, WM8988_ADCDAC, mute_reg);
      return 0;
}

static int wm8988_set_bias_level(struct snd_soc_codec *codec,
                         enum snd_soc_bias_level level)
{
      u16 pwr_reg = snd_soc_read(codec, WM8988_PWR1) & ~0x1c1;

      switch (level) {
      case SND_SOC_BIAS_ON:
            break;

      case SND_SOC_BIAS_PREPARE:
            /* VREF, VMID=2x50k, digital enabled */
            snd_soc_write(codec, WM8988_PWR1, pwr_reg | 0x00c0);
            break;

      case SND_SOC_BIAS_STANDBY:
            if (codec->bias_level == SND_SOC_BIAS_OFF) {
                  /* VREF, VMID=2x5k */
                  snd_soc_write(codec, WM8988_PWR1, pwr_reg | 0x1c1);

                  /* Charge caps */
                  msleep(100);
            }

            /* VREF, VMID=2*500k, digital stopped */
            snd_soc_write(codec, WM8988_PWR1, pwr_reg | 0x0141);
            break;

      case SND_SOC_BIAS_OFF:
            snd_soc_write(codec, WM8988_PWR1, 0x0000);
            break;
      }
      codec->bias_level = level;
      return 0;
}

#define WM8988_RATES SNDRV_PCM_RATE_8000_96000

#define WM8988_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
      SNDRV_PCM_FMTBIT_S24_LE)

static struct snd_soc_dai_ops wm8988_ops = {
      .startup = wm8988_pcm_startup,
      .hw_params = wm8988_pcm_hw_params,
      .set_fmt = wm8988_set_dai_fmt,
      .set_sysclk = wm8988_set_dai_sysclk,
      .digital_mute = wm8988_mute,
};

struct snd_soc_dai wm8988_dai = {
      .name = "WM8988",
      .playback = {
            .stream_name = "Playback",
            .channels_min = 1,
            .channels_max = 2,
            .rates = WM8988_RATES,
            .formats = WM8988_FORMATS,
      },
      .capture = {
            .stream_name = "Capture",
            .channels_min = 1,
            .channels_max = 2,
            .rates = WM8988_RATES,
            .formats = WM8988_FORMATS,
       },
      .ops = &wm8988_ops,
      .symmetric_rates = 1,
};
EXPORT_SYMBOL_GPL(wm8988_dai);

static int wm8988_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;

      wm8988_set_bias_level(codec, SND_SOC_BIAS_OFF);
      return 0;
}

static int wm8988_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 < WM8988_NUM_REG; i++) {
            if (i == WM8988_RESET)
                  continue;
            data[0] = (i << 1) | ((cache[i] >> 8) & 0x0001);
            data[1] = cache[i] & 0x00ff;
            codec->hw_write(codec->control_data, data, 2);
      }

      wm8988_set_bias_level(codec, SND_SOC_BIAS_STANDBY);

      return 0;
}

static struct snd_soc_codec *wm8988_codec;

static int wm8988_probe(struct platform_device *pdev)
{
      struct snd_soc_device *socdev = platform_get_drvdata(pdev);
      struct snd_soc_codec *codec;
      int ret = 0;

      if (wm8988_codec == NULL) {
            dev_err(&pdev->dev, "Codec device not registered\n");
            return -ENODEV;
      }

      socdev->card->codec = wm8988_codec;
      codec = wm8988_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, wm8988_snd_controls,
                        ARRAY_SIZE(wm8988_snd_controls));
      snd_soc_dapm_new_controls(codec, wm8988_dapm_widgets,
                          ARRAY_SIZE(wm8988_dapm_widgets));
      snd_soc_dapm_add_routes(codec, audio_map, ARRAY_SIZE(audio_map));
      snd_soc_dapm_new_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;
}

static int wm8988_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_wm8988 = {
      .probe =    wm8988_probe,
      .remove =   wm8988_remove,
      .suspend =  wm8988_suspend,
      .resume =   wm8988_resume,
};
EXPORT_SYMBOL_GPL(soc_codec_dev_wm8988);

static int wm8988_register(struct wm8988_priv *wm8988,
                     enum snd_soc_control_type control)
{
      struct snd_soc_codec *codec = &wm8988->codec;
      int ret;
      u16 reg;

      if (wm8988_codec) {
            dev_err(codec->dev, "Another WM8988 is registered\n");
            ret = -EINVAL;
            goto err;
      }

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

      codec->private_data = wm8988;
      codec->name = "WM8988";
      codec->owner = THIS_MODULE;
      codec->dai = &wm8988_dai;
      codec->num_dai = 1;
      codec->reg_cache_size = ARRAY_SIZE(wm8988->reg_cache);
      codec->reg_cache = &wm8988->reg_cache;
      codec->bias_level = SND_SOC_BIAS_OFF;
      codec->set_bias_level = wm8988_set_bias_level;

      memcpy(codec->reg_cache, wm8988_reg,
             sizeof(wm8988_reg));

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

      ret = wm8988_reset(codec);
      if (ret < 0) {
            dev_err(codec->dev, "Failed to issue reset\n");
            goto err;
      }

      /* set the update bits (we always update left then right) */
      reg = snd_soc_read(codec, WM8988_RADC);
      snd_soc_write(codec, WM8988_RADC, reg | 0x100);
      reg = snd_soc_read(codec, WM8988_RDAC);
      snd_soc_write(codec, WM8988_RDAC, reg | 0x0100);
      reg = snd_soc_read(codec, WM8988_ROUT1V);
      snd_soc_write(codec, WM8988_ROUT1V, reg | 0x0100);
      reg = snd_soc_read(codec, WM8988_ROUT2V);
      snd_soc_write(codec, WM8988_ROUT2V, reg | 0x0100);
      reg = snd_soc_read(codec, WM8988_RINVOL);
      snd_soc_write(codec, WM8988_RINVOL, reg | 0x0100);

      wm8988_set_bias_level(&wm8988->codec, SND_SOC_BIAS_STANDBY);

      wm8988_dai.dev = codec->dev;

      wm8988_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(&wm8988_dai);
      if (ret != 0) {
            dev_err(codec->dev, "Failed to register DAI: %d\n", ret);
            snd_soc_unregister_codec(codec);
            goto err_codec;
      }

      return 0;

err_codec:
      snd_soc_unregister_codec(codec);
err:
      kfree(wm8988);
      return ret;
}

static void wm8988_unregister(struct wm8988_priv *wm8988)
{
      wm8988_set_bias_level(&wm8988->codec, SND_SOC_BIAS_OFF);
      snd_soc_unregister_dai(&wm8988_dai);
      snd_soc_unregister_codec(&wm8988->codec);
      kfree(wm8988);
      wm8988_codec = NULL;
}

#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
static int wm8988_i2c_probe(struct i2c_client *i2c,
                      const struct i2c_device_id *id)
{
      struct wm8988_priv *wm8988;
      struct snd_soc_codec *codec;

      wm8988 = kzalloc(sizeof(struct wm8988_priv), GFP_KERNEL);
      if (wm8988 == NULL)
            return -ENOMEM;

      codec = &wm8988->codec;

      i2c_set_clientdata(i2c, wm8988);
      codec->control_data = i2c;

      codec->dev = &i2c->dev;

      return wm8988_register(wm8988, SND_SOC_I2C);
}

static int wm8988_i2c_remove(struct i2c_client *client)
{
      struct wm8988_priv *wm8988 = i2c_get_clientdata(client);
      wm8988_unregister(wm8988);
      return 0;
}

#ifdef CONFIG_PM
static int wm8988_i2c_suspend(struct i2c_client *client, pm_message_t msg)
{
      return snd_soc_suspend_device(&client->dev);
}

static int wm8988_i2c_resume(struct i2c_client *client)
{
      return snd_soc_resume_device(&client->dev);
}
#else
#define wm8988_i2c_suspend NULL
#define wm8988_i2c_resume NULL
#endif

static const struct i2c_device_id wm8988_i2c_id[] = {
      { "wm8988", 0 },
      { }
};
MODULE_DEVICE_TABLE(i2c, wm8988_i2c_id);

static struct i2c_driver wm8988_i2c_driver = {
      .driver = {
            .name = "WM8988",
            .owner = THIS_MODULE,
      },
      .probe = wm8988_i2c_probe,
      .remove = wm8988_i2c_remove,
      .suspend = wm8988_i2c_suspend,
      .resume = wm8988_i2c_resume,
      .id_table = wm8988_i2c_id,
};
#endif

#if defined(CONFIG_SPI_MASTER)
static int __devinit wm8988_spi_probe(struct spi_device *spi)
{
      struct wm8988_priv *wm8988;
      struct snd_soc_codec *codec;

      wm8988 = kzalloc(sizeof(struct wm8988_priv), GFP_KERNEL);
      if (wm8988 == NULL)
            return -ENOMEM;

      codec = &wm8988->codec;
      codec->control_data = spi;
      codec->dev = &spi->dev;

      dev_set_drvdata(&spi->dev, wm8988);

      return wm8988_register(wm8988, SND_SOC_SPI);
}

static int __devexit wm8988_spi_remove(struct spi_device *spi)
{
      struct wm8988_priv *wm8988 = dev_get_drvdata(&spi->dev);

      wm8988_unregister(wm8988);

      return 0;
}

#ifdef CONFIG_PM
static int wm8988_spi_suspend(struct spi_device *spi, pm_message_t msg)
{
      return snd_soc_suspend_device(&spi->dev);
}

static int wm8988_spi_resume(struct spi_device *spi)
{
      return snd_soc_resume_device(&spi->dev);
}
#else
#define wm8988_spi_suspend NULL
#define wm8988_spi_resume NULL
#endif

static struct spi_driver wm8988_spi_driver = {
      .driver = {
            .name = "wm8988",
            .bus  = &spi_bus_type,
            .owner      = THIS_MODULE,
      },
      .probe            = wm8988_spi_probe,
      .remove           = __devexit_p(wm8988_spi_remove),
      .suspend    = wm8988_spi_suspend,
      .resume           = wm8988_spi_resume,
};
#endif

static int __init wm8988_modinit(void)
{
      int ret;

#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
      ret = i2c_add_driver(&wm8988_i2c_driver);
      if (ret != 0)
            pr_err("WM8988: Unable to register I2C driver: %d\n", ret);
#endif
#if defined(CONFIG_SPI_MASTER)
      ret = spi_register_driver(&wm8988_spi_driver);
      if (ret != 0)
            pr_err("WM8988: Unable to register SPI driver: %d\n", ret);
#endif
      return ret;
}
module_init(wm8988_modinit);

static void __exit wm8988_exit(void)
{
#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
      i2c_del_driver(&wm8988_i2c_driver);
#endif
#if defined(CONFIG_SPI_MASTER)
      spi_unregister_driver(&wm8988_spi_driver);
#endif
}
module_exit(wm8988_exit);


MODULE_DESCRIPTION("ASoC WM8988 driver");
MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
MODULE_LICENSE("GPL");

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