wm8960.c

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/*
 * wm8960.c  --  WM8960 ALSA SoC Audio driver
 *
 * Copyright 2007-11 Wolfson Microelectronics, plc
 *
 * Author: Liam Girdwood
 *
 * 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/slab.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/initval.h>
#include <sound/tlv.h>
#include <sound/wm8960.h>

#include "wm8960.h"

/* R25 - Power 1 */
#define WM8960_VMID_MASK 0x180
#define WM8960_VREF      0x40

/* R26 - Power 2 */
#define WM8960_PWR2_LOUT1   0x40
#define WM8960_PWR2_ROUT1   0x20
#define WM8960_PWR2_OUT3    0x02

/* R28 - Anti-pop 1 */
#define WM8960_POBCTRL   0x80
#define WM8960_BUFDCOPEN 0x10
#define WM8960_BUFIOEN   0x08
#define WM8960_SOFT_ST   0x04
#define WM8960_HPSTBY    0x01

/* R29 - Anti-pop 2 */
#define WM8960_DISOP     0x40
#define WM8960_DRES_MASK 0x30

/*
 * wm8960 register cache
 * We can't read the WM8960 register space when we are
 * using 2 wire for device control, so we cache them instead.
 */
static const struct reg_default wm8960_reg_defaults[] = {
    {  0x0, 0x0097 },
    {  0x1, 0x0097 },
    {  0x2, 0x0000 },
    {  0x3, 0x0000 },
    {  0x4, 0x0000 },
    {  0x5, 0x0008 },
    {  0x6, 0x0000 },
    {  0x7, 0x000a },
    {  0x8, 0x01c0 },
    {  0x9, 0x0000 },
    {  0xa, 0x00ff },
    {  0xb, 0x00ff },

    { 0x10, 0x0000 },
    { 0x11, 0x007b },
    { 0x12, 0x0100 },
    { 0x13, 0x0032 },
    { 0x14, 0x0000 },
    { 0x15, 0x00c3 },
    { 0x16, 0x00c3 },
    { 0x17, 0x01c0 },
    { 0x18, 0x0000 },
    { 0x19, 0x0000 },
    { 0x1a, 0x0000 },
    { 0x1b, 0x0000 },
    { 0x1c, 0x0000 },
    { 0x1d, 0x0000 },

    { 0x20, 0x0100 },
    { 0x21, 0x0100 },
    { 0x22, 0x0050 },

    { 0x25, 0x0050 },
    { 0x26, 0x0000 },
    { 0x27, 0x0000 },
    { 0x28, 0x0000 },
    { 0x29, 0x0000 },
    { 0x2a, 0x0040 },
    { 0x2b, 0x0000 },
    { 0x2c, 0x0000 },
    { 0x2d, 0x0050 },
    { 0x2e, 0x0050 },
    { 0x2f, 0x0000 },
    { 0x30, 0x0002 },
    { 0x31, 0x0037 },

    { 0x33, 0x0080 },
    { 0x34, 0x0008 },
    { 0x35, 0x0031 },
    { 0x36, 0x0026 },
    { 0x37, 0x00e9 },
};

static bool wm8960_volatile(struct device *dev, unsigned int reg)
{
    switch (reg) {
    case WM8960_RESET:
        return true;
    default:
        return false;
    }
}

struct wm8960_priv {
    struct regmap *regmap;
    int (*set_bias_level)(struct snd_soc_codec *,
                  enum snd_soc_bias_level level);
    struct snd_soc_dapm_widget *lout1;
    struct snd_soc_dapm_widget *rout1;
    struct snd_soc_dapm_widget *out3;
    bool deemph;
    int playback_fs;
};

#define wm8960_reset(c) snd_soc_write(c, WM8960_RESET, 0)

/* enumerated controls */
static const char *wm8960_polarity[] = {"No Inversion", "Left Inverted",
    "Right Inverted", "Stereo Inversion"};
static const char *wm8960_3d_upper_cutoff[] = {"High", "Low"};
static const char *wm8960_3d_lower_cutoff[] = {"Low", "High"};
static const char *wm8960_alcfunc[] = {"Off", "Right", "Left", "Stereo"};
static const char *wm8960_alcmode[] = {"ALC", "Limiter"};

static const struct soc_enum wm8960_enum[] = {
    SOC_ENUM_SINGLE(WM8960_DACCTL1, 5, 4, wm8960_polarity),
    SOC_ENUM_SINGLE(WM8960_DACCTL2, 5, 4, wm8960_polarity),
    SOC_ENUM_SINGLE(WM8960_3D, 6, 2, wm8960_3d_upper_cutoff),
    SOC_ENUM_SINGLE(WM8960_3D, 5, 2, wm8960_3d_lower_cutoff),
    SOC_ENUM_SINGLE(WM8960_ALC1, 7, 4, wm8960_alcfunc),
    SOC_ENUM_SINGLE(WM8960_ALC3, 8, 2, wm8960_alcmode),
};

static const int deemph_settings[] = { 0, 32000, 44100, 48000 };

static int wm8960_set_deemph(struct snd_soc_codec *codec)
{
    struct wm8960_priv *wm8960 = snd_soc_codec_get_drvdata(codec);
    int val, i, best;

    /* If we're using deemphasis select the nearest available sample
     * rate.
     */
    if (wm8960->deemph) {
        best = 1;
        for (i = 2; i < ARRAY_SIZE(deemph_settings); i++) {
            if (abs(deemph_settings[i] - wm8960->playback_fs) <
                abs(deemph_settings[best] - wm8960->playback_fs))
                best = i;
        }

        val = best << 1;
    } else {
        val = 0;
    }

    dev_dbg(codec->dev, "Set deemphasis %d\n", val);

    return snd_soc_update_bits(codec, WM8960_DACCTL1,
                   0x6, val);
}

static int wm8960_get_deemph(struct snd_kcontrol *kcontrol,
                 struct snd_ctl_elem_value *ucontrol)
{
    struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
    struct wm8960_priv *wm8960 = snd_soc_codec_get_drvdata(codec);

    ucontrol->value.enumerated.item[0] = wm8960->deemph;
    return 0;
}

static int wm8960_put_deemph(struct snd_kcontrol *kcontrol,
                 struct snd_ctl_elem_value *ucontrol)
{
    struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
    struct wm8960_priv *wm8960 = snd_soc_codec_get_drvdata(codec);
    int deemph = ucontrol->value.enumerated.item[0];

    if (deemph > 1)
        return -EINVAL;

    wm8960->deemph = deemph;

    return wm8960_set_deemph(codec);
}

static const DECLARE_TLV_DB_SCALE(adc_tlv, -9700, 50, 0);
static const DECLARE_TLV_DB_SCALE(dac_tlv, -12700, 50, 1);
static const DECLARE_TLV_DB_SCALE(bypass_tlv, -2100, 300, 0);
static const DECLARE_TLV_DB_SCALE(out_tlv, -12100, 100, 1);

static const struct snd_kcontrol_new wm8960_snd_controls[] = {
SOC_DOUBLE_R_TLV("Capture Volume", WM8960_LINVOL, WM8960_RINVOL,
         0, 63, 0, adc_tlv),
SOC_DOUBLE_R("Capture Volume ZC Switch", WM8960_LINVOL, WM8960_RINVOL,
    6, 1, 0),
SOC_DOUBLE_R("Capture Switch", WM8960_LINVOL, WM8960_RINVOL,
    7, 1, 0),

SOC_DOUBLE_R_TLV("Playback Volume", WM8960_LDAC, WM8960_RDAC,
         0, 255, 0, dac_tlv),

SOC_DOUBLE_R_TLV("Headphone Playback Volume", WM8960_LOUT1, WM8960_ROUT1,
         0, 127, 0, out_tlv),
SOC_DOUBLE_R("Headphone Playback ZC Switch", WM8960_LOUT1, WM8960_ROUT1,
    7, 1, 0),

SOC_DOUBLE_R_TLV("Speaker Playback Volume", WM8960_LOUT2, WM8960_ROUT2,
         0, 127, 0, out_tlv),
SOC_DOUBLE_R("Speaker Playback ZC Switch", WM8960_LOUT2, WM8960_ROUT2,
    7, 1, 0),
SOC_SINGLE("Speaker DC Volume", WM8960_CLASSD3, 3, 5, 0),
SOC_SINGLE("Speaker AC Volume", WM8960_CLASSD3, 0, 5, 0),

SOC_SINGLE("PCM Playback -6dB Switch", WM8960_DACCTL1, 7, 1, 0),
SOC_ENUM("ADC Polarity", wm8960_enum[0]),
SOC_SINGLE("ADC High Pass Filter Switch", WM8960_DACCTL1, 0, 1, 0),

SOC_ENUM("DAC Polarity", wm8960_enum[2]),
SOC_SINGLE_BOOL_EXT("DAC Deemphasis Switch", 0,
            wm8960_get_deemph, wm8960_put_deemph),

SOC_ENUM("3D Filter Upper Cut-Off", wm8960_enum[2]),
SOC_ENUM("3D Filter Lower Cut-Off", wm8960_enum[3]),
SOC_SINGLE("3D Volume", WM8960_3D, 1, 15, 0),
SOC_SINGLE("3D Switch", WM8960_3D, 0, 1, 0),

SOC_ENUM("ALC Function", wm8960_enum[4]),
SOC_SINGLE("ALC Max Gain", WM8960_ALC1, 4, 7, 0),
SOC_SINGLE("ALC Target", WM8960_ALC1, 0, 15, 1),
SOC_SINGLE("ALC Min Gain", WM8960_ALC2, 4, 7, 0),
SOC_SINGLE("ALC Hold Time", WM8960_ALC2, 0, 15, 0),
SOC_ENUM("ALC Mode", wm8960_enum[5]),
SOC_SINGLE("ALC Decay", WM8960_ALC3, 4, 15, 0),
SOC_SINGLE("ALC Attack", WM8960_ALC3, 0, 15, 0),

SOC_SINGLE("Noise Gate Threshold", WM8960_NOISEG, 3, 31, 0),
SOC_SINGLE("Noise Gate Switch", WM8960_NOISEG, 0, 1, 0),

SOC_DOUBLE_R("ADC PCM Capture Volume", WM8960_LINPATH, WM8960_RINPATH,
    0, 127, 0),

SOC_SINGLE_TLV("Left Output Mixer Boost Bypass Volume",
           WM8960_BYPASS1, 4, 7, 1, bypass_tlv),
SOC_SINGLE_TLV("Left Output Mixer LINPUT3 Volume",
           WM8960_LOUTMIX, 4, 7, 1, bypass_tlv),
SOC_SINGLE_TLV("Right Output Mixer Boost Bypass Volume",
           WM8960_BYPASS2, 4, 7, 1, bypass_tlv),
SOC_SINGLE_TLV("Right Output Mixer RINPUT3 Volume",
           WM8960_ROUTMIX, 4, 7, 1, bypass_tlv),
};

static const struct snd_kcontrol_new wm8960_lin_boost[] = {
SOC_DAPM_SINGLE("LINPUT2 Switch", WM8960_LINPATH, 6, 1, 0),
SOC_DAPM_SINGLE("LINPUT3 Switch", WM8960_LINPATH, 7, 1, 0),
SOC_DAPM_SINGLE("LINPUT1 Switch", WM8960_LINPATH, 8, 1, 0),
};

static const struct snd_kcontrol_new wm8960_lin[] = {
SOC_DAPM_SINGLE("Boost Switch", WM8960_LINPATH, 3, 1, 0),
};

static const struct snd_kcontrol_new wm8960_rin_boost[] = {
SOC_DAPM_SINGLE("RINPUT2 Switch", WM8960_RINPATH, 6, 1, 0),
SOC_DAPM_SINGLE("RINPUT3 Switch", WM8960_RINPATH, 7, 1, 0),
SOC_DAPM_SINGLE("RINPUT1 Switch", WM8960_RINPATH, 8, 1, 0),
};

static const struct snd_kcontrol_new wm8960_rin[] = {
SOC_DAPM_SINGLE("Boost Switch", WM8960_RINPATH, 3, 1, 0),
};

static const struct snd_kcontrol_new wm8960_loutput_mixer[] = {
SOC_DAPM_SINGLE("PCM Playback Switch", WM8960_LOUTMIX, 8, 1, 0),
SOC_DAPM_SINGLE("LINPUT3 Switch", WM8960_LOUTMIX, 7, 1, 0),
SOC_DAPM_SINGLE("Boost Bypass Switch", WM8960_BYPASS1, 7, 1, 0),
};

static const struct snd_kcontrol_new wm8960_routput_mixer[] = {
SOC_DAPM_SINGLE("PCM Playback Switch", WM8960_ROUTMIX, 8, 1, 0),
SOC_DAPM_SINGLE("RINPUT3 Switch", WM8960_ROUTMIX, 7, 1, 0),
SOC_DAPM_SINGLE("Boost Bypass Switch", WM8960_BYPASS2, 7, 1, 0),
};

static const struct snd_kcontrol_new wm8960_mono_out[] = {
SOC_DAPM_SINGLE("Left Switch", WM8960_MONOMIX1, 7, 1, 0),
SOC_DAPM_SINGLE("Right Switch", WM8960_MONOMIX2, 7, 1, 0),
};

static const struct snd_soc_dapm_widget wm8960_dapm_widgets[] = {
SND_SOC_DAPM_INPUT("LINPUT1"),
SND_SOC_DAPM_INPUT("RINPUT1"),
SND_SOC_DAPM_INPUT("LINPUT2"),
SND_SOC_DAPM_INPUT("RINPUT2"),
SND_SOC_DAPM_INPUT("LINPUT3"),
SND_SOC_DAPM_INPUT("RINPUT3"),

SND_SOC_DAPM_SUPPLY("MICB", WM8960_POWER1, 1, 0, NULL, 0),

SND_SOC_DAPM_MIXER("Left Boost Mixer", WM8960_POWER1, 5, 0,
           wm8960_lin_boost, ARRAY_SIZE(wm8960_lin_boost)),
SND_SOC_DAPM_MIXER("Right Boost Mixer", WM8960_POWER1, 4, 0,
           wm8960_rin_boost, ARRAY_SIZE(wm8960_rin_boost)),

SND_SOC_DAPM_MIXER("Left Input Mixer", WM8960_POWER3, 5, 0,
           wm8960_lin, ARRAY_SIZE(wm8960_lin)),
SND_SOC_DAPM_MIXER("Right Input Mixer", WM8960_POWER3, 4, 0,
           wm8960_rin, ARRAY_SIZE(wm8960_rin)),

SND_SOC_DAPM_ADC("Left ADC", "Capture", WM8960_POWER2, 3, 0),
SND_SOC_DAPM_ADC("Right ADC", "Capture", WM8960_POWER2, 2, 0),

SND_SOC_DAPM_DAC("Left DAC", "Playback", WM8960_POWER2, 8, 0),
SND_SOC_DAPM_DAC("Right DAC", "Playback", WM8960_POWER2, 7, 0),

SND_SOC_DAPM_MIXER("Left Output Mixer", WM8960_POWER3, 3, 0,
    &wm8960_loutput_mixer[0],
    ARRAY_SIZE(wm8960_loutput_mixer)),
SND_SOC_DAPM_MIXER("Right Output Mixer", WM8960_POWER3, 2, 0,
    &wm8960_routput_mixer[0],
    ARRAY_SIZE(wm8960_routput_mixer)),

SND_SOC_DAPM_PGA("LOUT1 PGA", WM8960_POWER2, 6, 0, NULL, 0),
SND_SOC_DAPM_PGA("ROUT1 PGA", WM8960_POWER2, 5, 0, NULL, 0),

SND_SOC_DAPM_PGA("Left Speaker PGA", WM8960_POWER2, 4, 0, NULL, 0),
SND_SOC_DAPM_PGA("Right Speaker PGA", WM8960_POWER2, 3, 0, NULL, 0),

SND_SOC_DAPM_PGA("Right Speaker Output", WM8960_CLASSD1, 7, 0, NULL, 0),
SND_SOC_DAPM_PGA("Left Speaker Output", WM8960_CLASSD1, 6, 0, NULL, 0),

SND_SOC_DAPM_OUTPUT("SPK_LP"),
SND_SOC_DAPM_OUTPUT("SPK_LN"),
SND_SOC_DAPM_OUTPUT("HP_L"),
SND_SOC_DAPM_OUTPUT("HP_R"),
SND_SOC_DAPM_OUTPUT("SPK_RP"),
SND_SOC_DAPM_OUTPUT("SPK_RN"),
SND_SOC_DAPM_OUTPUT("OUT3"),
};

static const struct snd_soc_dapm_widget wm8960_dapm_widgets_out3[] = {
SND_SOC_DAPM_MIXER("Mono Output Mixer", WM8960_POWER2, 1, 0,
    &wm8960_mono_out[0],
    ARRAY_SIZE(wm8960_mono_out)),
};

/* Represent OUT3 as a PGA so that it gets turned on with LOUT1/ROUT1 */
static const struct snd_soc_dapm_widget wm8960_dapm_widgets_capless[] = {
SND_SOC_DAPM_PGA("OUT3 VMID", WM8960_POWER2, 1, 0, NULL, 0),
};

static const struct snd_soc_dapm_route audio_paths[] = {
    { "Left Boost Mixer", "LINPUT1 Switch", "LINPUT1" },
    { "Left Boost Mixer", "LINPUT2 Switch", "LINPUT2" },
    { "Left Boost Mixer", "LINPUT3 Switch", "LINPUT3" },

    { "Left Input Mixer", "Boost Switch", "Left Boost Mixer", },
    { "Left Input Mixer", NULL, "LINPUT1", },  /* Really Boost Switch */
    { "Left Input Mixer", NULL, "LINPUT2" },
    { "Left Input Mixer", NULL, "LINPUT3" },

    { "Right Boost Mixer", "RINPUT1 Switch", "RINPUT1" },
    { "Right Boost Mixer", "RINPUT2 Switch", "RINPUT2" },
    { "Right Boost Mixer", "RINPUT3 Switch", "RINPUT3" },

    { "Right Input Mixer", "Boost Switch", "Right Boost Mixer", },
    { "Right Input Mixer", NULL, "RINPUT1", },  /* Really Boost Switch */
    { "Right Input Mixer", NULL, "RINPUT2" },
    { "Right Input Mixer", NULL, "LINPUT3" },

    { "Left ADC", NULL, "Left Input Mixer" },
    { "Right ADC", NULL, "Right Input Mixer" },

    { "Left Output Mixer", "LINPUT3 Switch", "LINPUT3" },
    { "Left Output Mixer", "Boost Bypass Switch", "Left Boost Mixer"} ,
    { "Left Output Mixer", "PCM Playback Switch", "Left DAC" },

    { "Right Output Mixer", "RINPUT3 Switch", "RINPUT3" },
    { "Right Output Mixer", "Boost Bypass Switch", "Right Boost Mixer" } ,
    { "Right Output Mixer", "PCM Playback Switch", "Right DAC" },

    { "LOUT1 PGA", NULL, "Left Output Mixer" },
    { "ROUT1 PGA", NULL, "Right Output Mixer" },

    { "HP_L", NULL, "LOUT1 PGA" },
    { "HP_R", NULL, "ROUT1 PGA" },

    { "Left Speaker PGA", NULL, "Left Output Mixer" },
    { "Right Speaker PGA", NULL, "Right Output Mixer" },

    { "Left Speaker Output", NULL, "Left Speaker PGA" },
    { "Right Speaker Output", NULL, "Right Speaker PGA" },

    { "SPK_LN", NULL, "Left Speaker Output" },
    { "SPK_LP", NULL, "Left Speaker Output" },
    { "SPK_RN", NULL, "Right Speaker Output" },
    { "SPK_RP", NULL, "Right Speaker Output" },
};

static const struct snd_soc_dapm_route audio_paths_out3[] = {
    { "Mono Output Mixer", "Left Switch", "Left Output Mixer" },
    { "Mono Output Mixer", "Right Switch", "Right Output Mixer" },

    { "OUT3", NULL, "Mono Output Mixer", }
};

static const struct snd_soc_dapm_route audio_paths_capless[] = {
    { "HP_L", NULL, "OUT3 VMID" },
    { "HP_R", NULL, "OUT3 VMID" },

    { "OUT3 VMID", NULL, "Left Output Mixer" },
    { "OUT3 VMID", NULL, "Right Output Mixer" },
};

static int wm8960_add_widgets(struct snd_soc_codec *codec)
{
    struct wm8960_data *pdata = codec->dev->platform_data;
    struct wm8960_priv *wm8960 = snd_soc_codec_get_drvdata(codec);
    struct snd_soc_dapm_context *dapm = &codec->dapm;
    struct snd_soc_dapm_widget *w;

    snd_soc_dapm_new_controls(dapm, wm8960_dapm_widgets,
                  ARRAY_SIZE(wm8960_dapm_widgets));

    snd_soc_dapm_add_routes(dapm, audio_paths, ARRAY_SIZE(audio_paths));

    /* In capless mode OUT3 is used to provide VMID for the
     * headphone outputs, otherwise it is used as a mono mixer.
     */
    if (pdata && pdata->capless) {
        snd_soc_dapm_new_controls(dapm, wm8960_dapm_widgets_capless,
                      ARRAY_SIZE(wm8960_dapm_widgets_capless));

        snd_soc_dapm_add_routes(dapm, audio_paths_capless,
                    ARRAY_SIZE(audio_paths_capless));
    } else {
        snd_soc_dapm_new_controls(dapm, wm8960_dapm_widgets_out3,
                      ARRAY_SIZE(wm8960_dapm_widgets_out3));

        snd_soc_dapm_add_routes(dapm, audio_paths_out3,
                    ARRAY_SIZE(audio_paths_out3));
    }

    /* We need to power up the headphone output stage out of
     * sequence for capless mode.  To save scanning the widget
     * list each time to find the desired power state do so now
     * and save the result.
     */
    list_for_each_entry(w, &codec->card->widgets, list) {
        if (w->dapm != &codec->dapm)
            continue;
        if (strcmp(w->name, "LOUT1 PGA") == 0)
            wm8960->lout1 = w;
        if (strcmp(w->name, "ROUT1 PGA") == 0)
            wm8960->rout1 = w;
        if (strcmp(w->name, "OUT3 VMID") == 0)
            wm8960->out3 = w;
    }
    
    return 0;
}

static int wm8960_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;
    }

    /* set iface */
    snd_soc_write(codec, WM8960_IFACE1, iface);
    return 0;
}

static struct {
    int rate;
    unsigned int val;
} alc_rates[] = {
    { 48000, 0 },
    { 44100, 0 },
    { 32000, 1 },
    { 22050, 2 },
    { 24000, 2 },
    { 16000, 3 },
    { 11250, 4 },
    { 12000, 4 },
    {  8000, 5 },
};

static int wm8960_hw_params(struct snd_pcm_substream *substream,
                struct snd_pcm_hw_params *params,
                struct snd_soc_dai *dai)
{
    struct snd_soc_codec *codec = dai->codec;
    struct wm8960_priv *wm8960 = snd_soc_codec_get_drvdata(codec);
    u16 iface = snd_soc_read(codec, WM8960_IFACE1) & 0xfff3;
    snd_pcm_format_t format = params_format(params);
    int i;

    /* bit size */
    switch (format) {
    case SNDRV_PCM_FORMAT_S16_LE:
    case SNDRV_PCM_FORMAT_S16_BE:
        break;
    case SNDRV_PCM_FORMAT_S20_3LE:
    case SNDRV_PCM_FORMAT_S20_3BE:
        iface |= 0x0004;
        break;
    case SNDRV_PCM_FORMAT_S24_LE:
    case SNDRV_PCM_FORMAT_S24_BE:
        iface |= 0x0008;
        break;
    default:
        dev_err(codec->dev, "unsupported format %i\n", format);
        return -EINVAL;
    }

    /* Update filters for the new rate */
    if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
        wm8960->playback_fs = params_rate(params);
        wm8960_set_deemph(codec);
    } else {
        for (i = 0; i < ARRAY_SIZE(alc_rates); i++)
            if (alc_rates[i].rate == params_rate(params))
                snd_soc_update_bits(codec,
                            WM8960_ADDCTL3, 0x7,
                            alc_rates[i].val);
    }

    /* set iface */
    snd_soc_write(codec, WM8960_IFACE1, iface);
    return 0;
}

static int wm8960_mute(struct snd_soc_dai *dai, int mute)
{
    struct snd_soc_codec *codec = dai->codec;

    if (mute)
        snd_soc_update_bits(codec, WM8960_DACCTL1, 0x8, 0x8);
    else
        snd_soc_update_bits(codec, WM8960_DACCTL1, 0x8, 0);
    return 0;
}

static int wm8960_set_bias_level_out3(struct snd_soc_codec *codec,
                      enum snd_soc_bias_level level)
{
    struct wm8960_priv *wm8960 = snd_soc_codec_get_drvdata(codec);

    switch (level) {
    case SND_SOC_BIAS_ON:
        break;

    case SND_SOC_BIAS_PREPARE:
        /* Set VMID to 2x50k */
        snd_soc_update_bits(codec, WM8960_POWER1, 0x180, 0x80);
        break;

    case SND_SOC_BIAS_STANDBY:
        if (codec->dapm.bias_level == SND_SOC_BIAS_OFF) {
            regcache_sync(wm8960->regmap);

            /* Enable anti-pop features */
            snd_soc_write(codec, WM8960_APOP1,
                      WM8960_POBCTRL | WM8960_SOFT_ST |
                      WM8960_BUFDCOPEN | WM8960_BUFIOEN);

            /* Enable & ramp VMID at 2x50k */
            snd_soc_update_bits(codec, WM8960_POWER1, 0x80, 0x80);
            msleep(100);

            /* Enable VREF */
            snd_soc_update_bits(codec, WM8960_POWER1, WM8960_VREF,
                        WM8960_VREF);

            /* Disable anti-pop features */
            snd_soc_write(codec, WM8960_APOP1, WM8960_BUFIOEN);
        }

        /* Set VMID to 2x250k */
        snd_soc_update_bits(codec, WM8960_POWER1, 0x180, 0x100);
        break;

    case SND_SOC_BIAS_OFF:
        /* Enable anti-pop features */
        snd_soc_write(codec, WM8960_APOP1,
                 WM8960_POBCTRL | WM8960_SOFT_ST |
                 WM8960_BUFDCOPEN | WM8960_BUFIOEN);

        /* Disable VMID and VREF, let them discharge */
        snd_soc_write(codec, WM8960_POWER1, 0);
        msleep(600);
        break;
    }

    codec->dapm.bias_level = level;

    return 0;
}

static int wm8960_set_bias_level_capless(struct snd_soc_codec *codec,
                     enum snd_soc_bias_level level)
{
    struct wm8960_priv *wm8960 = snd_soc_codec_get_drvdata(codec);
    int reg;

    switch (level) {
    case SND_SOC_BIAS_ON:
        break;

    case SND_SOC_BIAS_PREPARE:
        switch (codec->dapm.bias_level) {
        case SND_SOC_BIAS_STANDBY:
            /* Enable anti pop mode */
            snd_soc_update_bits(codec, WM8960_APOP1,
                        WM8960_POBCTRL | WM8960_SOFT_ST |
                        WM8960_BUFDCOPEN,
                        WM8960_POBCTRL | WM8960_SOFT_ST |
                        WM8960_BUFDCOPEN);

            /* Enable LOUT1, ROUT1 and OUT3 if they're enabled */
            reg = 0;
            if (wm8960->lout1 && wm8960->lout1->power)
                reg |= WM8960_PWR2_LOUT1;
            if (wm8960->rout1 && wm8960->rout1->power)
                reg |= WM8960_PWR2_ROUT1;
            if (wm8960->out3 && wm8960->out3->power)
                reg |= WM8960_PWR2_OUT3;
            snd_soc_update_bits(codec, WM8960_POWER2,
                        WM8960_PWR2_LOUT1 |
                        WM8960_PWR2_ROUT1 |
                        WM8960_PWR2_OUT3, reg);

            /* Enable VMID at 2*50k */
            snd_soc_update_bits(codec, WM8960_POWER1,
                        WM8960_VMID_MASK, 0x80);

            /* Ramp */
            msleep(100);

            /* Enable VREF */
            snd_soc_update_bits(codec, WM8960_POWER1,
                        WM8960_VREF, WM8960_VREF);

            msleep(100);
            break;

        case SND_SOC_BIAS_ON:
            /* Enable anti-pop mode */
            snd_soc_update_bits(codec, WM8960_APOP1,
                        WM8960_POBCTRL | WM8960_SOFT_ST |
                        WM8960_BUFDCOPEN,
                        WM8960_POBCTRL | WM8960_SOFT_ST |
                        WM8960_BUFDCOPEN);

            /* Disable VMID and VREF */
            snd_soc_update_bits(codec, WM8960_POWER1,
                        WM8960_VREF | WM8960_VMID_MASK, 0);
            break;

        case SND_SOC_BIAS_OFF:
            regcache_sync(wm8960->regmap);
            break;
        default:
            break;
        }
        break;

    case SND_SOC_BIAS_STANDBY:
        switch (codec->dapm.bias_level) {
        case SND_SOC_BIAS_PREPARE:
            /* Disable HP discharge */
            snd_soc_update_bits(codec, WM8960_APOP2,
                        WM8960_DISOP | WM8960_DRES_MASK,
                        0);

            /* Disable anti-pop features */
            snd_soc_update_bits(codec, WM8960_APOP1,
                        WM8960_POBCTRL | WM8960_SOFT_ST |
                        WM8960_BUFDCOPEN,
                        WM8960_POBCTRL | WM8960_SOFT_ST |
                        WM8960_BUFDCOPEN);
            break;

        default:
            break;
        }
        break;

    case SND_SOC_BIAS_OFF:
        break;
    }

    codec->dapm.bias_level = level;

    return 0;
}

/* PLL divisors */
struct _pll_div {
    u32 pre_div:1;
    u32 n:4;
    u32 k:24;
};

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

static int pll_factors(unsigned int source, unsigned int target,
               struct _pll_div *pll_div)
{
    unsigned long long Kpart;
    unsigned int K, Ndiv, Nmod;

    pr_debug("WM8960 PLL: setting %dHz->%dHz\n", source, target);

    /* Scale up target to PLL operating frequency */
    target *= 4;

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

    if ((Ndiv < 6) || (Ndiv > 12)) {
        pr_err("WM8960 PLL: Unsupported N=%d\n", Ndiv);
        return -EINVAL;
    }

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

    do_div(Kpart, source);

    K = Kpart & 0xFFFFFFFF;

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

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

    pll_div->k = K;

    pr_debug("WM8960 PLL: N=%x K=%x pre_div=%d\n",
         pll_div->n, pll_div->k, pll_div->pre_div);

    return 0;
}

static int wm8960_set_dai_pll(struct snd_soc_dai *codec_dai, int pll_id,
        int source, unsigned int freq_in, unsigned int freq_out)
{
    struct snd_soc_codec *codec = codec_dai->codec;
    u16 reg;
    static struct _pll_div pll_div;
    int ret;

    if (freq_in && freq_out) {
        ret = pll_factors(freq_in, freq_out, &pll_div);
        if (ret != 0)
            return ret;
    }

    /* Disable the PLL: even if we are changing the frequency the
     * PLL needs to be disabled while we do so. */
    snd_soc_update_bits(codec, WM8960_CLOCK1, 0x1, 0);
    snd_soc_update_bits(codec, WM8960_POWER2, 0x1, 0);

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

    reg = snd_soc_read(codec, WM8960_PLL1) & ~0x3f;
    reg |= pll_div.pre_div << 4;
    reg |= pll_div.n;

    if (pll_div.k) {
        reg |= 0x20;

        snd_soc_write(codec, WM8960_PLL2, (pll_div.k >> 18) & 0x3f);
        snd_soc_write(codec, WM8960_PLL3, (pll_div.k >> 9) & 0x1ff);
        snd_soc_write(codec, WM8960_PLL4, pll_div.k & 0x1ff);
    }
    snd_soc_write(codec, WM8960_PLL1, reg);

    /* Turn it on */
    snd_soc_update_bits(codec, WM8960_POWER2, 0x1, 0x1);
    msleep(250);
    snd_soc_update_bits(codec, WM8960_CLOCK1, 0x1, 0x1);

    return 0;
}

static int wm8960_set_dai_clkdiv(struct snd_soc_dai *codec_dai,
        int div_id, int div)
{
    struct snd_soc_codec *codec = codec_dai->codec;
    u16 reg;

    switch (div_id) {
    case WM8960_SYSCLKDIV:
        reg = snd_soc_read(codec, WM8960_CLOCK1) & 0x1f9;
        snd_soc_write(codec, WM8960_CLOCK1, reg | div);
        break;
    case WM8960_DACDIV:
        reg = snd_soc_read(codec, WM8960_CLOCK1) & 0x1c7;
        snd_soc_write(codec, WM8960_CLOCK1, reg | div);
        break;
    case WM8960_OPCLKDIV:
        reg = snd_soc_read(codec, WM8960_PLL1) & 0x03f;
        snd_soc_write(codec, WM8960_PLL1, reg | div);
        break;
    case WM8960_DCLKDIV:
        reg = snd_soc_read(codec, WM8960_CLOCK2) & 0x03f;
        snd_soc_write(codec, WM8960_CLOCK2, reg | div);
        break;
    case WM8960_TOCLKSEL:
        reg = snd_soc_read(codec, WM8960_ADDCTL1) & 0x1fd;
        snd_soc_write(codec, WM8960_ADDCTL1, reg | div);
        break;
    default:
        return -EINVAL;
    }

    return 0;
}

static int wm8960_set_bias_level(struct snd_soc_codec *codec,
                 enum snd_soc_bias_level level)
{
    struct wm8960_priv *wm8960 = snd_soc_codec_get_drvdata(codec);

    return wm8960->set_bias_level(codec, level);
}

#define WM8960_RATES SNDRV_PCM_RATE_8000_48000

#define WM8960_FORMATS \
    (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE | \
    SNDRV_PCM_FMTBIT_S24_LE)

static const struct snd_soc_dai_ops wm8960_dai_ops = {
    .hw_params = wm8960_hw_params,
    .digital_mute = wm8960_mute,
    .set_fmt = wm8960_set_dai_fmt,
    .set_clkdiv = wm8960_set_dai_clkdiv,
    .set_pll = wm8960_set_dai_pll,
};

static struct snd_soc_dai_driver wm8960_dai = {
    .name = "wm8960-hifi",
    .playback = {
        .stream_name = "Playback",
        .channels_min = 1,
        .channels_max = 2,
        .rates = WM8960_RATES,
        .formats = WM8960_FORMATS,},
    .capture = {
        .stream_name = "Capture",
        .channels_min = 1,
        .channels_max = 2,
        .rates = WM8960_RATES,
        .formats = WM8960_FORMATS,},
    .ops = &wm8960_dai_ops,
    .symmetric_rates = 1,
};

static int wm8960_suspend(struct snd_soc_codec *codec)
{
    struct wm8960_priv *wm8960 = snd_soc_codec_get_drvdata(codec);

    wm8960->set_bias_level(codec, SND_SOC_BIAS_OFF);
    return 0;
}

static int wm8960_resume(struct snd_soc_codec *codec)
{
    struct wm8960_priv *wm8960 = snd_soc_codec_get_drvdata(codec);

    wm8960->set_bias_level(codec, SND_SOC_BIAS_STANDBY);
    return 0;
}

static int wm8960_probe(struct snd_soc_codec *codec)
{
    struct wm8960_priv *wm8960 = snd_soc_codec_get_drvdata(codec);
    struct wm8960_data *pdata = dev_get_platdata(codec->dev);
    int ret;

    wm8960->set_bias_level = wm8960_set_bias_level_out3;

    if (!pdata) {
        dev_warn(codec->dev, "No platform data supplied\n");
    } else {
        if (pdata->capless)
            wm8960->set_bias_level = wm8960_set_bias_level_capless;
    }

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

    ret = wm8960_reset(codec);
    if (ret < 0) {
        dev_err(codec->dev, "Failed to issue reset\n");
        return ret;
    }

    wm8960->set_bias_level(codec, SND_SOC_BIAS_STANDBY);

    /* Latch the update bits */
    snd_soc_update_bits(codec, WM8960_LINVOL, 0x100, 0x100);
    snd_soc_update_bits(codec, WM8960_RINVOL, 0x100, 0x100);
    snd_soc_update_bits(codec, WM8960_LADC, 0x100, 0x100);
    snd_soc_update_bits(codec, WM8960_RADC, 0x100, 0x100);
    snd_soc_update_bits(codec, WM8960_LDAC, 0x100, 0x100);
    snd_soc_update_bits(codec, WM8960_RDAC, 0x100, 0x100);
    snd_soc_update_bits(codec, WM8960_LOUT1, 0x100, 0x100);
    snd_soc_update_bits(codec, WM8960_ROUT1, 0x100, 0x100);
    snd_soc_update_bits(codec, WM8960_LOUT2, 0x100, 0x100);
    snd_soc_update_bits(codec, WM8960_ROUT2, 0x100, 0x100);

    snd_soc_add_codec_controls(codec, wm8960_snd_controls,
                     ARRAY_SIZE(wm8960_snd_controls));
    wm8960_add_widgets(codec);

    return 0;
}

/* power down chip */
static int wm8960_remove(struct snd_soc_codec *codec)
{
    struct wm8960_priv *wm8960 = snd_soc_codec_get_drvdata(codec);

    wm8960->set_bias_level(codec, SND_SOC_BIAS_OFF);
    return 0;
}

static struct snd_soc_codec_driver soc_codec_dev_wm8960 = {
    .probe =    wm8960_probe,
    .remove =   wm8960_remove,
    .suspend =  wm8960_suspend,
    .resume =   wm8960_resume,
    .set_bias_level = wm8960_set_bias_level,
};

static const struct regmap_config wm8960_regmap = {
    .reg_bits = 7,
    .val_bits = 9,
    .max_register = WM8960_PLL4,

    .reg_defaults = wm8960_reg_defaults,
    .num_reg_defaults = ARRAY_SIZE(wm8960_reg_defaults),
    .cache_type = REGCACHE_RBTREE,

    .volatile_reg = wm8960_volatile,
};

static __devinit int wm8960_i2c_probe(struct i2c_client *i2c,
                      const struct i2c_device_id *id)
{
    struct wm8960_data *pdata = dev_get_platdata(&i2c->dev);
    struct wm8960_priv *wm8960;
    int ret;

    wm8960 = devm_kzalloc(&i2c->dev, sizeof(struct wm8960_priv),
                  GFP_KERNEL);
    if (wm8960 == NULL)
        return -ENOMEM;

    wm8960->regmap = regmap_init_i2c(i2c, &wm8960_regmap);
    if (IS_ERR(wm8960->regmap))
        return PTR_ERR(wm8960->regmap);

    if (pdata && pdata->shared_lrclk) {
        ret = regmap_update_bits(wm8960->regmap, WM8960_ADDCTL2,
                     0x4, 0x4);
        if (ret != 0) {
            dev_err(&i2c->dev, "Failed to enable LRCM: %d\n",
                ret);
            return ret;
        }
    }

    i2c_set_clientdata(i2c, wm8960);

    ret = snd_soc_register_codec(&i2c->dev,
            &soc_codec_dev_wm8960, &wm8960_dai, 1);

    return ret;
}

static __devexit int wm8960_i2c_remove(struct i2c_client *client)
{
    snd_soc_unregister_codec(&client->dev);
    return 0;
}

static const struct i2c_device_id wm8960_i2c_id[] = {
    { "wm8960", 0 },
    { }
};
MODULE_DEVICE_TABLE(i2c, wm8960_i2c_id);

static struct i2c_driver wm8960_i2c_driver = {
    .driver = {
        .name = "wm8960",
        .owner = THIS_MODULE,
    },
    .probe =    wm8960_i2c_probe,
    .remove =   __devexit_p(wm8960_i2c_remove),
    .id_table = wm8960_i2c_id,
};

module_i2c_driver(wm8960_i2c_driver);

MODULE_DESCRIPTION("ASoC WM8960 driver");
MODULE_AUTHOR("Liam Girdwood");
MODULE_LICENSE("GPL");