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wm8750.c

/*
 * wm8750.c -- WM8750 ALSA SoC audio driver
 *
 * Copyright 2005 Openedhand Ltd.
 *
 * Author: Richard Purdie <richard@openedhand.com>
 *
 * Based on WM8753.c
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/pm.h>
#include <linux/i2c.h>
#include <linux/platform_device.h>
#include <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 "wm8750.h"

#define AUDIO_NAME "WM8750"
#define WM8750_VERSION "0.12"

/* codec private data */
struct wm8750_priv {
      unsigned int sysclk;
};

/*
 * wm8750 register cache
 * We can't read the WM8750 register space when we
 * are using 2 wire for device control, so we cache them instead.
 */
static const u16 wm8750_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 */
};

/*
 * read wm8750 register cache
 */
static inline unsigned int wm8750_read_reg_cache(struct snd_soc_codec *codec,
      unsigned int reg)
{
      u16 *cache = codec->reg_cache;
      if (reg > WM8750_CACHE_REGNUM)
            return -1;
      return cache[reg];
}

/*
 * write wm8750 register cache
 */
static inline void wm8750_write_reg_cache(struct snd_soc_codec *codec,
      unsigned int reg, unsigned int value)
{
      u16 *cache = codec->reg_cache;
      if (reg > WM8750_CACHE_REGNUM)
            return;
      cache[reg] = value;
}

static int wm8750_write(struct snd_soc_codec *codec, unsigned int reg,
      unsigned int value)
{
      u8 data[2];

      /* data is
       *   D15..D9 WM8753 register offset
       *   D8...D0 register data
       */
      data[0] = (reg << 1) | ((value >> 8) & 0x0001);
      data[1] = value & 0x00ff;

      wm8750_write_reg_cache(codec, reg, value);
      if (codec->hw_write(codec->control_data, data, 2) == 2)
            return 0;
      else
            return -EIO;
}

#define wm8750_reset(c) wm8750_write(c, WM8750_RESET, 0)

/*
 * WM8750 Controls
 */
static const char *wm8750_bass[] = {"Linear Control", "Adaptive Boost"};
static const char *wm8750_bass_filter[] = { "130Hz @ 48kHz", "200Hz @ 48kHz" };
static const char *wm8750_treble[] = {"8kHz", "4kHz"};
static const char *wm8750_3d_lc[] = {"200Hz", "500Hz"};
static const char *wm8750_3d_uc[] = {"2.2kHz", "1.5kHz"};
static const char *wm8750_3d_func[] = {"Capture", "Playback"};
static const char *wm8750_alc_func[] = {"Off", "Right", "Left", "Stereo"};
static const char *wm8750_ng_type[] = {"Constant PGA Gain",
      "Mute ADC Output"};
static const char *wm8750_line_mux[] = {"Line 1", "Line 2", "Line 3", "PGA",
      "Differential"};
static const char *wm8750_pga_sel[] = {"Line 1", "Line 2", "Line 3",
      "Differential"};
static const char *wm8750_out3[] = {"VREF", "ROUT1 + Vol", "MonoOut",
      "ROUT1"};
static const char *wm8750_diff_sel[] = {"Line 1", "Line 2"};
static const char *wm8750_adcpol[] = {"Normal", "L Invert", "R Invert",
      "L + R Invert"};
static const char *wm8750_deemph[] = {"None", "32Khz", "44.1Khz", "48Khz"};
static const char *wm8750_mono_mux[] = {"Stereo", "Mono (Left)",
      "Mono (Right)", "Digital Mono"};

static const struct soc_enum wm8750_enum[] = {
SOC_ENUM_SINGLE(WM8750_BASS, 7, 2, wm8750_bass),
SOC_ENUM_SINGLE(WM8750_BASS, 6, 2, wm8750_bass_filter),
SOC_ENUM_SINGLE(WM8750_TREBLE, 6, 2, wm8750_treble),
SOC_ENUM_SINGLE(WM8750_3D, 5, 2, wm8750_3d_lc),
SOC_ENUM_SINGLE(WM8750_3D, 6, 2, wm8750_3d_uc),
SOC_ENUM_SINGLE(WM8750_3D, 7, 2, wm8750_3d_func),
SOC_ENUM_SINGLE(WM8750_ALC1, 7, 4, wm8750_alc_func),
SOC_ENUM_SINGLE(WM8750_NGATE, 1, 2, wm8750_ng_type),
SOC_ENUM_SINGLE(WM8750_LOUTM1, 0, 5, wm8750_line_mux),
SOC_ENUM_SINGLE(WM8750_ROUTM1, 0, 5, wm8750_line_mux),
SOC_ENUM_SINGLE(WM8750_LADCIN, 6, 4, wm8750_pga_sel), /* 10 */
SOC_ENUM_SINGLE(WM8750_RADCIN, 6, 4, wm8750_pga_sel),
SOC_ENUM_SINGLE(WM8750_ADCTL2, 7, 4, wm8750_out3),
SOC_ENUM_SINGLE(WM8750_ADCIN, 8, 2, wm8750_diff_sel),
SOC_ENUM_SINGLE(WM8750_ADCDAC, 5, 4, wm8750_adcpol),
SOC_ENUM_SINGLE(WM8750_ADCDAC, 1, 4, wm8750_deemph),
SOC_ENUM_SINGLE(WM8750_ADCIN, 6, 4, wm8750_mono_mux), /* 16 */

};

static const struct snd_kcontrol_new wm8750_snd_controls[] = {

SOC_DOUBLE_R("Capture Volume", WM8750_LINVOL, WM8750_RINVOL, 0, 63, 0),
SOC_DOUBLE_R("Capture ZC Switch", WM8750_LINVOL, WM8750_RINVOL, 6, 1, 0),
SOC_DOUBLE_R("Capture Switch", WM8750_LINVOL, WM8750_RINVOL, 7, 1, 1),

SOC_DOUBLE_R("Headphone Playback ZC Switch", WM8750_LOUT1V,
      WM8750_ROUT1V, 7, 1, 0),
SOC_DOUBLE_R("Speaker Playback ZC Switch", WM8750_LOUT2V,
      WM8750_ROUT2V, 7, 1, 0),

SOC_ENUM("Playback De-emphasis", wm8750_enum[15]),

SOC_ENUM("Capture Polarity", wm8750_enum[14]),
SOC_SINGLE("Playback 6dB Attenuate", WM8750_ADCDAC, 7, 1, 0),
SOC_SINGLE("Capture 6dB Attenuate", WM8750_ADCDAC, 8, 1, 0),

SOC_DOUBLE_R("PCM Volume", WM8750_LDAC, WM8750_RDAC, 0, 255, 0),

SOC_ENUM("Bass Boost", wm8750_enum[0]),
SOC_ENUM("Bass Filter", wm8750_enum[1]),
SOC_SINGLE("Bass Volume", WM8750_BASS, 0, 15, 1),

SOC_SINGLE("Treble Volume", WM8750_TREBLE, 0, 15, 1),
SOC_ENUM("Treble Cut-off", wm8750_enum[2]),

SOC_SINGLE("3D Switch", WM8750_3D, 0, 1, 0),
SOC_SINGLE("3D Volume", WM8750_3D, 1, 15, 0),
SOC_ENUM("3D Lower Cut-off", wm8750_enum[3]),
SOC_ENUM("3D Upper Cut-off", wm8750_enum[4]),
SOC_ENUM("3D Mode", wm8750_enum[5]),

SOC_SINGLE("ALC Capture Target Volume", WM8750_ALC1, 0, 7, 0),
SOC_SINGLE("ALC Capture Max Volume", WM8750_ALC1, 4, 7, 0),
SOC_ENUM("ALC Capture Function", wm8750_enum[6]),
SOC_SINGLE("ALC Capture ZC Switch", WM8750_ALC2, 7, 1, 0),
SOC_SINGLE("ALC Capture Hold Time", WM8750_ALC2, 0, 15, 0),
SOC_SINGLE("ALC Capture Decay Time", WM8750_ALC3, 4, 15, 0),
SOC_SINGLE("ALC Capture Attack Time", WM8750_ALC3, 0, 15, 0),
SOC_SINGLE("ALC Capture NG Threshold", WM8750_NGATE, 3, 31, 0),
SOC_ENUM("ALC Capture NG Type", wm8750_enum[4]),
SOC_SINGLE("ALC Capture NG Switch", WM8750_NGATE, 0, 1, 0),

SOC_SINGLE("Left ADC Capture Volume", WM8750_LADC, 0, 255, 0),
SOC_SINGLE("Right ADC Capture Volume", WM8750_RADC, 0, 255, 0),

SOC_SINGLE("ZC Timeout Switch", WM8750_ADCTL1, 0, 1, 0),
SOC_SINGLE("Playback Invert Switch", WM8750_ADCTL1, 1, 1, 0),

SOC_SINGLE("Right Speaker Playback Invert Switch", WM8750_ADCTL2, 4, 1, 0),

/* Unimplemented */
/* ADCDAC Bit 0 - ADCHPD */
/* ADCDAC Bit 4 - HPOR */
/* ADCTL1 Bit 2,3 - DATSEL */
/* ADCTL1 Bit 4,5 - DMONOMIX */
/* ADCTL1 Bit 6,7 - VSEL */
/* ADCTL2 Bit 2 - LRCM */
/* ADCTL2 Bit 3 - TRI */
/* ADCTL3 Bit 5 - HPFLREN */
/* ADCTL3 Bit 6 - VROI */
/* ADCTL3 Bit 7,8 - ADCLRM */
/* ADCIN Bit 4 - LDCM */
/* ADCIN Bit 5 - RDCM */

SOC_DOUBLE_R("Mic Boost", WM8750_LADCIN, WM8750_RADCIN, 4, 3, 0),

SOC_DOUBLE_R("Bypass Left Playback Volume", WM8750_LOUTM1,
      WM8750_LOUTM2, 4, 7, 1),
SOC_DOUBLE_R("Bypass Right Playback Volume", WM8750_ROUTM1,
      WM8750_ROUTM2, 4, 7, 1),
SOC_DOUBLE_R("Bypass Mono Playback Volume", WM8750_MOUTM1,
      WM8750_MOUTM2, 4, 7, 1),

SOC_SINGLE("Mono Playback ZC Switch", WM8750_MOUTV, 7, 1, 0),

SOC_DOUBLE_R("Headphone Playback Volume", WM8750_LOUT1V, WM8750_ROUT1V,
      0, 127, 0),
SOC_DOUBLE_R("Speaker Playback Volume", WM8750_LOUT2V, WM8750_ROUT2V,
      0, 127, 0),

SOC_SINGLE("Mono Playback Volume", WM8750_MOUTV, 0, 127, 0),

};

/* add non dapm controls */
static int wm8750_add_controls(struct snd_soc_codec *codec)
{
      int err, i;

      for (i = 0; i < ARRAY_SIZE(wm8750_snd_controls); i++) {
            err = snd_ctl_add(codec->card,
                        snd_soc_cnew(&wm8750_snd_controls[i],
                                    codec, NULL));
            if (err < 0)
                  return err;
      }
      return 0;
}

/*
 * DAPM Controls
 */

/* Left Mixer */
static const struct snd_kcontrol_new wm8750_left_mixer_controls[] = {
SOC_DAPM_SINGLE("Playback Switch", WM8750_LOUTM1, 8, 1, 0),
SOC_DAPM_SINGLE("Left Bypass Switch", WM8750_LOUTM1, 7, 1, 0),
SOC_DAPM_SINGLE("Right Playback Switch", WM8750_LOUTM2, 8, 1, 0),
SOC_DAPM_SINGLE("Right Bypass Switch", WM8750_LOUTM2, 7, 1, 0),
};

/* Right Mixer */
static const struct snd_kcontrol_new wm8750_right_mixer_controls[] = {
SOC_DAPM_SINGLE("Left Playback Switch", WM8750_ROUTM1, 8, 1, 0),
SOC_DAPM_SINGLE("Left Bypass Switch", WM8750_ROUTM1, 7, 1, 0),
SOC_DAPM_SINGLE("Playback Switch", WM8750_ROUTM2, 8, 1, 0),
SOC_DAPM_SINGLE("Right Bypass Switch", WM8750_ROUTM2, 7, 1, 0),
};

/* Mono Mixer */
static const struct snd_kcontrol_new wm8750_mono_mixer_controls[] = {
SOC_DAPM_SINGLE("Left Playback Switch", WM8750_MOUTM1, 8, 1, 0),
SOC_DAPM_SINGLE("Left Bypass Switch", WM8750_MOUTM1, 7, 1, 0),
SOC_DAPM_SINGLE("Right Playback Switch", WM8750_MOUTM2, 8, 1, 0),
SOC_DAPM_SINGLE("Right Bypass Switch", WM8750_MOUTM2, 7, 1, 0),
};

/* Left Line Mux */
static const struct snd_kcontrol_new wm8750_left_line_controls =
SOC_DAPM_ENUM("Route", wm8750_enum[8]);

/* Right Line Mux */
static const struct snd_kcontrol_new wm8750_right_line_controls =
SOC_DAPM_ENUM("Route", wm8750_enum[9]);

/* Left PGA Mux */
static const struct snd_kcontrol_new wm8750_left_pga_controls =
SOC_DAPM_ENUM("Route", wm8750_enum[10]);

/* Right PGA Mux */
static const struct snd_kcontrol_new wm8750_right_pga_controls =
SOC_DAPM_ENUM("Route", wm8750_enum[11]);

/* Out 3 Mux */
static const struct snd_kcontrol_new wm8750_out3_controls =
SOC_DAPM_ENUM("Route", wm8750_enum[12]);

/* Differential Mux */
static const struct snd_kcontrol_new wm8750_diffmux_controls =
SOC_DAPM_ENUM("Route", wm8750_enum[13]);

/* Mono ADC Mux */
static const struct snd_kcontrol_new wm8750_monomux_controls =
SOC_DAPM_ENUM("Route", wm8750_enum[16]);

static const struct snd_soc_dapm_widget wm8750_dapm_widgets[] = {
      SND_SOC_DAPM_MIXER("Left Mixer", SND_SOC_NOPM, 0, 0,
            &wm8750_left_mixer_controls[0],
            ARRAY_SIZE(wm8750_left_mixer_controls)),
      SND_SOC_DAPM_MIXER("Right Mixer", SND_SOC_NOPM, 0, 0,
            &wm8750_right_mixer_controls[0],
            ARRAY_SIZE(wm8750_right_mixer_controls)),
      SND_SOC_DAPM_MIXER("Mono Mixer", WM8750_PWR2, 2, 0,
            &wm8750_mono_mixer_controls[0],
            ARRAY_SIZE(wm8750_mono_mixer_controls)),

      SND_SOC_DAPM_PGA("Right Out 2", WM8750_PWR2, 3, 0, NULL, 0),
      SND_SOC_DAPM_PGA("Left Out 2", WM8750_PWR2, 4, 0, NULL, 0),
      SND_SOC_DAPM_PGA("Right Out 1", WM8750_PWR2, 5, 0, NULL, 0),
      SND_SOC_DAPM_PGA("Left Out 1", WM8750_PWR2, 6, 0, NULL, 0),
      SND_SOC_DAPM_DAC("Right DAC", "Right Playback", WM8750_PWR2, 7, 0),
      SND_SOC_DAPM_DAC("Left DAC", "Left Playback", WM8750_PWR2, 8, 0),

      SND_SOC_DAPM_MICBIAS("Mic Bias", WM8750_PWR1, 1, 0),
      SND_SOC_DAPM_ADC("Right ADC", "Right Capture", WM8750_PWR1, 2, 0),
      SND_SOC_DAPM_ADC("Left ADC", "Left Capture", WM8750_PWR1, 3, 0),

      SND_SOC_DAPM_MUX("Left PGA Mux", WM8750_PWR1, 5, 0,
            &wm8750_left_pga_controls),
      SND_SOC_DAPM_MUX("Right PGA Mux", WM8750_PWR1, 4, 0,
            &wm8750_right_pga_controls),
      SND_SOC_DAPM_MUX("Left Line Mux", SND_SOC_NOPM, 0, 0,
            &wm8750_left_line_controls),
      SND_SOC_DAPM_MUX("Right Line Mux", SND_SOC_NOPM, 0, 0,
            &wm8750_right_line_controls),

      SND_SOC_DAPM_MUX("Out3 Mux", SND_SOC_NOPM, 0, 0, &wm8750_out3_controls),
      SND_SOC_DAPM_PGA("Out 3", WM8750_PWR2, 1, 0, NULL, 0),
      SND_SOC_DAPM_PGA("Mono Out 1", WM8750_PWR2, 2, 0, NULL, 0),

      SND_SOC_DAPM_MUX("Differential Mux", SND_SOC_NOPM, 0, 0,
            &wm8750_diffmux_controls),
      SND_SOC_DAPM_MUX("Left ADC Mux", SND_SOC_NOPM, 0, 0,
            &wm8750_monomux_controls),
      SND_SOC_DAPM_MUX("Right ADC Mux", SND_SOC_NOPM, 0, 0,
            &wm8750_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_OUTPUT("OUT3"),

      SND_SOC_DAPM_INPUT("LINPUT1"),
      SND_SOC_DAPM_INPUT("LINPUT2"),
      SND_SOC_DAPM_INPUT("LINPUT3"),
      SND_SOC_DAPM_INPUT("RINPUT1"),
      SND_SOC_DAPM_INPUT("RINPUT2"),
      SND_SOC_DAPM_INPUT("RINPUT3"),
};

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 1", NULL, "Mono Mixer"},
      {"MONO1", NULL, "Mono Out 1"},

      /* out 3 */
      {"Out3 Mux", "VREF", "VREF"},
      {"Out3 Mux", "ROUT1 + Vol", "ROUT1"},
      {"Out3 Mux", "ROUT1", "Right Mixer"},
      {"Out3 Mux", "MonoOut", "MONO1"},
      {"Out 3", NULL, "Out3 Mux"},
      {"OUT3", NULL, "Out 3"},

      /* Left Line Mux */
      {"Left Line Mux", "Line 1", "LINPUT1"},
      {"Left Line Mux", "Line 2", "LINPUT2"},
      {"Left Line Mux", "Line 3", "LINPUT3"},
      {"Left Line Mux", "PGA", "Left PGA Mux"},
      {"Left Line Mux", "Differential", "Differential Mux"},

      /* Right Line Mux */
      {"Right Line Mux", "Line 1", "RINPUT1"},
      {"Right Line Mux", "Line 2", "RINPUT2"},
      {"Right Line Mux", "Line 3", "RINPUT3"},
      {"Right Line Mux", "PGA", "Right PGA Mux"},
      {"Right Line Mux", "Differential", "Differential Mux"},

      /* Left PGA Mux */
      {"Left PGA Mux", "Line 1", "LINPUT1"},
      {"Left PGA Mux", "Line 2", "LINPUT2"},
      {"Left PGA Mux", "Line 3", "LINPUT3"},
      {"Left PGA Mux", "Differential", "Differential Mux"},

      /* Right PGA Mux */
      {"Right PGA Mux", "Line 1", "RINPUT1"},
      {"Right PGA Mux", "Line 2", "RINPUT2"},
      {"Right PGA Mux", "Line 3", "RINPUT3"},
      {"Right PGA Mux", "Differential", "Differential Mux"},

      /* 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 */
      {"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 wm8750_add_widgets(struct snd_soc_codec *codec)
{
      snd_soc_dapm_new_controls(codec, wm8750_dapm_widgets,
                          ARRAY_SIZE(wm8750_dapm_widgets));

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

      snd_soc_dapm_new_widgets(codec);
      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 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;
      }

      printk(KERN_ERR "wm8750: could not get coeff for mclk %d @ rate %d\n",
            mclk, rate);
      return -EINVAL;
}

static int wm8750_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 wm8750_priv *wm8750 = codec->private_data;

      switch (freq) {
      case 11289600:
      case 12000000:
      case 12288000:
      case 16934400:
      case 18432000:
            wm8750->sysclk = freq;
            return 0;
      }
      return -EINVAL;
}

static int wm8750_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;
      }

      wm8750_write(codec, WM8750_IFACE, iface);
      return 0;
}

static int wm8750_pcm_hw_params(struct snd_pcm_substream *substream,
      struct snd_pcm_hw_params *params)
{
      struct snd_soc_pcm_runtime *rtd = substream->private_data;
      struct snd_soc_device *socdev = rtd->socdev;
      struct snd_soc_codec *codec = socdev->codec;
      struct wm8750_priv *wm8750 = codec->private_data;
      u16 iface = wm8750_read_reg_cache(codec, WM8750_IFACE) & 0x1f3;
      u16 srate = wm8750_read_reg_cache(codec, WM8750_SRATE) & 0x1c0;
      int coeff = get_coeff(wm8750->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 */
      wm8750_write(codec, WM8750_IFACE, iface);
      if (coeff >= 0)
            wm8750_write(codec, WM8750_SRATE, srate |
                  (coeff_div[coeff].sr << 1) | coeff_div[coeff].usb);

      return 0;
}

static int wm8750_mute(struct snd_soc_dai *dai, int mute)
{
      struct snd_soc_codec *codec = dai->codec;
      u16 mute_reg = wm8750_read_reg_cache(codec, WM8750_ADCDAC) & 0xfff7;

      if (mute)
            wm8750_write(codec, WM8750_ADCDAC, mute_reg | 0x8);
      else
            wm8750_write(codec, WM8750_ADCDAC, mute_reg);
      return 0;
}

static int wm8750_set_bias_level(struct snd_soc_codec *codec,
                         enum snd_soc_bias_level level)
{
      u16 pwr_reg = wm8750_read_reg_cache(codec, WM8750_PWR1) & 0xfe3e;

      switch (level) {
      case SND_SOC_BIAS_ON:
            /* set vmid to 50k and unmute dac */
            wm8750_write(codec, WM8750_PWR1, pwr_reg | 0x00c0);
            break;
      case SND_SOC_BIAS_PREPARE:
            /* set vmid to 5k for quick power up */
            wm8750_write(codec, WM8750_PWR1, pwr_reg | 0x01c1);
            break;
      case SND_SOC_BIAS_STANDBY:
            /* mute dac and set vmid to 500k, enable VREF */
            wm8750_write(codec, WM8750_PWR1, pwr_reg | 0x0141);
            break;
      case SND_SOC_BIAS_OFF:
            wm8750_write(codec, WM8750_PWR1, 0x0001);
            break;
      }
      codec->bias_level = level;
      return 0;
}

#define WM8750_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 WM8750_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
      SNDRV_PCM_FMTBIT_S24_LE)

struct snd_soc_dai wm8750_dai = {
      .name = "WM8750",
      .playback = {
            .stream_name = "Playback",
            .channels_min = 1,
            .channels_max = 2,
            .rates = WM8750_RATES,
            .formats = WM8750_FORMATS,},
      .capture = {
            .stream_name = "Capture",
            .channels_min = 1,
            .channels_max = 2,
            .rates = WM8750_RATES,
            .formats = WM8750_FORMATS,},
      .ops = {
            .hw_params = wm8750_pcm_hw_params,
      },
      .dai_ops = {
            .digital_mute = wm8750_mute,
            .set_fmt = wm8750_set_dai_fmt,
            .set_sysclk = wm8750_set_dai_sysclk,
      },
};
EXPORT_SYMBOL_GPL(wm8750_dai);

static void wm8750_work(struct work_struct *work)
{
      struct snd_soc_codec *codec =
            container_of(work, struct snd_soc_codec, delayed_work.work);
      wm8750_set_bias_level(codec, codec->bias_level);
}

static int wm8750_suspend(struct platform_device *pdev, pm_message_t state)
{
      struct snd_soc_device *socdev = platform_get_drvdata(pdev);
      struct snd_soc_codec *codec = socdev->codec;

      wm8750_set_bias_level(codec, SND_SOC_BIAS_OFF);
      return 0;
}

static int wm8750_resume(struct platform_device *pdev)
{
      struct snd_soc_device *socdev = platform_get_drvdata(pdev);
      struct snd_soc_codec *codec = socdev->codec;
      int i;
      u8 data[2];
      u16 *cache = codec->reg_cache;

      /* Sync reg_cache with the hardware */
      for (i = 0; i < ARRAY_SIZE(wm8750_reg); i++) {
            if (i == WM8750_RESET)
                  continue;
            data[0] = (i << 1) | ((cache[i] >> 8) & 0x0001);
            data[1] = cache[i] & 0x00ff;
            codec->hw_write(codec->control_data, data, 2);
      }

      wm8750_set_bias_level(codec, SND_SOC_BIAS_STANDBY);

      /* charge wm8750 caps */
      if (codec->suspend_bias_level == SND_SOC_BIAS_ON) {
            wm8750_set_bias_level(codec, SND_SOC_BIAS_PREPARE);
            codec->bias_level = SND_SOC_BIAS_ON;
            schedule_delayed_work(&codec->delayed_work,
                              msecs_to_jiffies(1000));
      }

      return 0;
}

/*
 * initialise the WM8750 driver
 * register the mixer and dsp interfaces with the kernel
 */
static int wm8750_init(struct snd_soc_device *socdev)
{
      struct snd_soc_codec *codec = socdev->codec;
      int reg, ret = 0;

      codec->name = "WM8750";
      codec->owner = THIS_MODULE;
      codec->read = wm8750_read_reg_cache;
      codec->write = wm8750_write;
      codec->set_bias_level = wm8750_set_bias_level;
      codec->dai = &wm8750_dai;
      codec->num_dai = 1;
      codec->reg_cache_size = ARRAY_SIZE(wm8750_reg);
      codec->reg_cache = kmemdup(wm8750_reg, sizeof(wm8750_reg), GFP_KERNEL);
      if (codec->reg_cache == NULL)
            return -ENOMEM;

      wm8750_reset(codec);

      /* register pcms */
      ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
      if (ret < 0) {
            printk(KERN_ERR "wm8750: failed to create pcms\n");
            goto pcm_err;
      }

      /* charge output caps */
      wm8750_set_bias_level(codec, SND_SOC_BIAS_PREPARE);
      codec->bias_level = SND_SOC_BIAS_STANDBY;
      schedule_delayed_work(&codec->delayed_work, msecs_to_jiffies(1000));

      /* set the update bits */
      reg = wm8750_read_reg_cache(codec, WM8750_LDAC);
      wm8750_write(codec, WM8750_LDAC, reg | 0x0100);
      reg = wm8750_read_reg_cache(codec, WM8750_RDAC);
      wm8750_write(codec, WM8750_RDAC, reg | 0x0100);
      reg = wm8750_read_reg_cache(codec, WM8750_LOUT1V);
      wm8750_write(codec, WM8750_LOUT1V, reg | 0x0100);
      reg = wm8750_read_reg_cache(codec, WM8750_ROUT1V);
      wm8750_write(codec, WM8750_ROUT1V, reg | 0x0100);
      reg = wm8750_read_reg_cache(codec, WM8750_LOUT2V);
      wm8750_write(codec, WM8750_LOUT2V, reg | 0x0100);
      reg = wm8750_read_reg_cache(codec, WM8750_ROUT2V);
      wm8750_write(codec, WM8750_ROUT2V, reg | 0x0100);
      reg = wm8750_read_reg_cache(codec, WM8750_LINVOL);
      wm8750_write(codec, WM8750_LINVOL, reg | 0x0100);
      reg = wm8750_read_reg_cache(codec, WM8750_RINVOL);
      wm8750_write(codec, WM8750_RINVOL, reg | 0x0100);

      wm8750_add_controls(codec);
      wm8750_add_widgets(codec);
      ret = snd_soc_register_card(socdev);
      if (ret < 0) {
            printk(KERN_ERR "wm8750: failed to register card\n");
            goto card_err;
      }
      return ret;

card_err:
      snd_soc_free_pcms(socdev);
      snd_soc_dapm_free(socdev);
pcm_err:
      kfree(codec->reg_cache);
      return ret;
}

/* If the i2c layer weren't so broken, we could pass this kind of data
   around */
static struct snd_soc_device *wm8750_socdev;

#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)

/*
 * WM8731 2 wire address is determined by GPIO5
 * state during powerup.
 *    low  = 0x1a
 *    high = 0x1b
 */
static unsigned short normal_i2c[] = { 0, I2C_CLIENT_END };

/* Magic definition of all other variables and things */
I2C_CLIENT_INSMOD;

static struct i2c_driver wm8750_i2c_driver;
static struct i2c_client client_template;

static int wm8750_codec_probe(struct i2c_adapter *adap, int addr, int kind)
{
      struct snd_soc_device *socdev = wm8750_socdev;
      struct wm8750_setup_data *setup = socdev->codec_data;
      struct snd_soc_codec *codec = socdev->codec;
      struct i2c_client *i2c;
      int ret;

      if (addr != setup->i2c_address)
            return -ENODEV;

      client_template.adapter = adap;
      client_template.addr = addr;

      i2c = kmemdup(&client_template, sizeof(client_template), GFP_KERNEL);
      if (i2c == NULL) {
            kfree(codec);
            return -ENOMEM;
      }
      i2c_set_clientdata(i2c, codec);
      codec->control_data = i2c;

      ret = i2c_attach_client(i2c);
      if (ret < 0) {
            pr_err("failed to attach codec at addr %x\n", addr);
            goto err;
      }

      ret = wm8750_init(socdev);
      if (ret < 0) {
            pr_err("failed to initialise WM8750\n");
            goto err;
      }
      return ret;

err:
      kfree(codec);
      kfree(i2c);
      return ret;
}

static int wm8750_i2c_detach(struct i2c_client *client)
{
      struct snd_soc_codec *codec = i2c_get_clientdata(client);
      i2c_detach_client(client);
      kfree(codec->reg_cache);
      kfree(client);
      return 0;
}

static int wm8750_i2c_attach(struct i2c_adapter *adap)
{
      return i2c_probe(adap, &addr_data, wm8750_codec_probe);
}

/* corgi i2c codec control layer */
static struct i2c_driver wm8750_i2c_driver = {
      .driver = {
            .name = "WM8750 I2C Codec",
            .owner = THIS_MODULE,
      },
      .id =             I2C_DRIVERID_WM8750,
      .attach_adapter = wm8750_i2c_attach,
      .detach_client =  wm8750_i2c_detach,
      .command =        NULL,
};

static struct i2c_client client_template = {
      .name =   "WM8750",
      .driver = &wm8750_i2c_driver,
};
#endif

static int wm8750_probe(struct platform_device *pdev)
{
      struct snd_soc_device *socdev = platform_get_drvdata(pdev);
      struct wm8750_setup_data *setup = socdev->codec_data;
      struct snd_soc_codec *codec;
      struct wm8750_priv *wm8750;
      int ret = 0;

      pr_info("WM8750 Audio Codec %s", WM8750_VERSION);
      codec = kzalloc(sizeof(struct snd_soc_codec), GFP_KERNEL);
      if (codec == NULL)
            return -ENOMEM;

      wm8750 = kzalloc(sizeof(struct wm8750_priv), GFP_KERNEL);
      if (wm8750 == NULL) {
            kfree(codec);
            return -ENOMEM;
      }

      codec->private_data = wm8750;
      socdev->codec = codec;
      mutex_init(&codec->mutex);
      INIT_LIST_HEAD(&codec->dapm_widgets);
      INIT_LIST_HEAD(&codec->dapm_paths);
      wm8750_socdev = socdev;
      INIT_DELAYED_WORK(&codec->delayed_work, wm8750_work);

#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
      if (setup->i2c_address) {
            normal_i2c[0] = setup->i2c_address;
            codec->hw_write = (hw_write_t)i2c_master_send;
            ret = i2c_add_driver(&wm8750_i2c_driver);
            if (ret != 0)
                  printk(KERN_ERR "can't add i2c driver");
      }
#else
            /* Add other interfaces here */
#endif

      return ret;
}

/*
 * This function forces any delayed work to be queued and run.
 */
static int run_delayed_work(struct delayed_work *dwork)
{
      int ret;

      /* cancel any work waiting to be queued. */
      ret = cancel_delayed_work(dwork);

      /* if there was any work waiting then we run it now and
       * wait for it's completion */
      if (ret) {
            schedule_delayed_work(dwork, 0);
            flush_scheduled_work();
      }
      return ret;
}

/* power down chip */
static int wm8750_remove(struct platform_device *pdev)
{
      struct snd_soc_device *socdev = platform_get_drvdata(pdev);
      struct snd_soc_codec *codec = socdev->codec;

      if (codec->control_data)
            wm8750_set_bias_level(codec, SND_SOC_BIAS_OFF);
      run_delayed_work(&codec->delayed_work);
      snd_soc_free_pcms(socdev);
      snd_soc_dapm_free(socdev);
#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
      i2c_del_driver(&wm8750_i2c_driver);
#endif
      kfree(codec->private_data);
      kfree(codec);

      return 0;
}

struct snd_soc_codec_device soc_codec_dev_wm8750 = {
      .probe =    wm8750_probe,
      .remove =   wm8750_remove,
      .suspend =  wm8750_suspend,
      .resume =   wm8750_resume,
};
EXPORT_SYMBOL_GPL(soc_codec_dev_wm8750);

MODULE_DESCRIPTION("ASoC WM8750 driver");
MODULE_AUTHOR("Liam Girdwood");
MODULE_LICENSE("GPL");

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