wm8900.c

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/*
 * wm8900.c  --  WM8900 ALSA Soc Audio driver
 *
 * Copyright 2007, 2008 Wolfson Microelectronics PLC.
 *
 * Author: Mark Brown <[email protected]>
 *
 * 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.
 *
 * TODO:
 *  - Tristating.
 *  - TDM.
 *  - Jack detect.
 *  - FLL source configuration, currently only MCLK is supported.
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/pm.h>
#include <linux/i2c.h>
#include <linux/regmap.h>
#include <linux/spi/spi.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 "wm8900.h"

/* WM8900 register space */
#define WM8900_REG_RESET    0x0
#define WM8900_REG_ID       0x0
#define WM8900_REG_POWER1   0x1
#define WM8900_REG_POWER2   0x2
#define WM8900_REG_POWER3   0x3
#define WM8900_REG_AUDIO1   0x4
#define WM8900_REG_AUDIO2   0x5
#define WM8900_REG_CLOCKING1    0x6
#define WM8900_REG_CLOCKING2    0x7
#define WM8900_REG_AUDIO3       0x8
#define WM8900_REG_AUDIO4       0x9
#define WM8900_REG_DACCTRL      0xa
#define WM8900_REG_LDAC_DV      0xb
#define WM8900_REG_RDAC_DV      0xc
#define WM8900_REG_SIDETONE     0xd
#define WM8900_REG_ADCCTRL      0xe
#define WM8900_REG_LADC_DV  0xf
#define WM8900_REG_RADC_DV      0x10
#define WM8900_REG_GPIO         0x12
#define WM8900_REG_INCTL    0x15
#define WM8900_REG_LINVOL   0x16
#define WM8900_REG_RINVOL   0x17
#define WM8900_REG_INBOOSTMIX1  0x18
#define WM8900_REG_INBOOSTMIX2  0x19
#define WM8900_REG_ADCPATH  0x1a
#define WM8900_REG_AUXBOOST 0x1b
#define WM8900_REG_ADDCTL       0x1e
#define WM8900_REG_FLLCTL1      0x24
#define WM8900_REG_FLLCTL2      0x25
#define WM8900_REG_FLLCTL3      0x26
#define WM8900_REG_FLLCTL4      0x27
#define WM8900_REG_FLLCTL5      0x28
#define WM8900_REG_FLLCTL6      0x29
#define WM8900_REG_LOUTMIXCTL1  0x2c
#define WM8900_REG_ROUTMIXCTL1  0x2d
#define WM8900_REG_BYPASS1  0x2e
#define WM8900_REG_BYPASS2  0x2f
#define WM8900_REG_AUXOUT_CTL   0x30
#define WM8900_REG_LOUT1CTL     0x33
#define WM8900_REG_ROUT1CTL     0x34
#define WM8900_REG_LOUT2CTL 0x35
#define WM8900_REG_ROUT2CTL 0x36
#define WM8900_REG_HPCTL1   0x3a
#define WM8900_REG_OUTBIASCTL   0x73

#define WM8900_MAXREG       0x80

#define WM8900_REG_ADDCTL_OUT1_DIS    0x80
#define WM8900_REG_ADDCTL_OUT2_DIS    0x40
#define WM8900_REG_ADDCTL_VMID_DIS    0x20
#define WM8900_REG_ADDCTL_BIAS_SRC    0x10
#define WM8900_REG_ADDCTL_VMID_SOFTST 0x04
#define WM8900_REG_ADDCTL_TEMP_SD     0x02

#define WM8900_REG_GPIO_TEMP_ENA   0x2

#define WM8900_REG_POWER1_STARTUP_BIAS_ENA 0x0100
#define WM8900_REG_POWER1_BIAS_ENA         0x0008
#define WM8900_REG_POWER1_VMID_BUF_ENA     0x0004
#define WM8900_REG_POWER1_FLL_ENA          0x0040

#define WM8900_REG_POWER2_SYSCLK_ENA  0x8000
#define WM8900_REG_POWER2_ADCL_ENA    0x0002
#define WM8900_REG_POWER2_ADCR_ENA    0x0001

#define WM8900_REG_POWER3_DACL_ENA    0x0002
#define WM8900_REG_POWER3_DACR_ENA    0x0001

#define WM8900_REG_AUDIO1_AIF_FMT_MASK 0x0018
#define WM8900_REG_AUDIO1_LRCLK_INV    0x0080
#define WM8900_REG_AUDIO1_BCLK_INV     0x0100

#define WM8900_REG_CLOCKING1_BCLK_DIR   0x1
#define WM8900_REG_CLOCKING1_MCLK_SRC   0x100
#define WM8900_REG_CLOCKING1_BCLK_MASK  0x01e
#define WM8900_REG_CLOCKING1_OPCLK_MASK 0x7000

#define WM8900_REG_CLOCKING2_ADC_CLKDIV 0xe0
#define WM8900_REG_CLOCKING2_DAC_CLKDIV 0x1c

#define WM8900_REG_DACCTRL_MUTE          0x004
#define WM8900_REG_DACCTRL_DAC_SB_FILT   0x100
#define WM8900_REG_DACCTRL_AIF_LRCLKRATE 0x400

#define WM8900_REG_AUDIO3_ADCLRC_DIR    0x0800

#define WM8900_REG_AUDIO4_DACLRC_DIR    0x0800

#define WM8900_REG_FLLCTL1_OSC_ENA    0x100

#define WM8900_REG_FLLCTL6_FLL_SLOW_LOCK_REF 0x100

#define WM8900_REG_HPCTL1_HP_IPSTAGE_ENA 0x80
#define WM8900_REG_HPCTL1_HP_OPSTAGE_ENA 0x40
#define WM8900_REG_HPCTL1_HP_CLAMP_IP    0x20
#define WM8900_REG_HPCTL1_HP_CLAMP_OP    0x10
#define WM8900_REG_HPCTL1_HP_SHORT       0x08
#define WM8900_REG_HPCTL1_HP_SHORT2      0x04

#define WM8900_LRC_MASK 0x03ff

struct wm8900_priv {
    struct regmap *regmap;

    u32 fll_in; /* FLL input frequency */
    u32 fll_out; /* FLL output frequency */
};

/*
 * wm8900 register cache.  We can't read the entire register space and we
 * have slow control buses so we cache the registers.
 */
static const struct reg_default wm8900_reg_defaults[] = {
    {  1, 0x0000 },
    {  2, 0xc000 },
    {  3, 0x0000 },
    {  4, 0x4050 },
    {  5, 0x4000 },
    {  6, 0x0008 },
    {  7, 0x0000 },
    {  8, 0x0040 },
    {  9, 0x0040 },
    { 10, 0x1004 },
    { 11, 0x00c0 },
    { 12, 0x00c0 },
    { 13, 0x0000 },
    { 14, 0x0100 },
    { 15, 0x00c0 },
    { 16, 0x00c0 },
    { 17, 0x0000 },
    { 18, 0xb001 },
    { 19, 0x0000 },
    { 20, 0x0000 },
    { 21, 0x0044 },
    { 22, 0x004c },
    { 23, 0x004c },
    { 24, 0x0044 },
    { 25, 0x0044 },
    { 26, 0x0000 },
    { 27, 0x0044 },
    { 28, 0x0000 },
    { 29, 0x0000 },
    { 30, 0x0002 },
    { 31, 0x0000 },
    { 32, 0x0000 },
    { 33, 0x0000 },
    { 34, 0x0000 },
    { 35, 0x0000 },
    { 36, 0x0008 },
    { 37, 0x0000 },
    { 38, 0x0000 },
    { 39, 0x0008 },
    { 40, 0x0097 },
    { 41, 0x0100 },
    { 42, 0x0000 },
    { 43, 0x0000 },
    { 44, 0x0050 },
    { 45, 0x0050 },
    { 46, 0x0055 },
    { 47, 0x0055 },
    { 48, 0x0055 },
    { 49, 0x0000 },
    { 50, 0x0000 },
    { 51, 0x0079 },
    { 52, 0x0079 },
    { 53, 0x0079 },
    { 54, 0x0079 },
    { 55, 0x0000 },
};

static bool wm8900_volatile_register(struct device *dev, unsigned int reg)
{
    switch (reg) {
    case WM8900_REG_ID:
        return true;
    default:
        return false;
    }
}

static void wm8900_reset(struct snd_soc_codec *codec)
{
    snd_soc_write(codec, WM8900_REG_RESET, 0);
}

static int wm8900_hp_event(struct snd_soc_dapm_widget *w,
               struct snd_kcontrol *kcontrol, int event)
{
    struct snd_soc_codec *codec = w->codec;
    u16 hpctl1 = snd_soc_read(codec, WM8900_REG_HPCTL1);

    switch (event) {
    case SND_SOC_DAPM_PRE_PMU:
        /* Clamp headphone outputs */
        hpctl1 = WM8900_REG_HPCTL1_HP_CLAMP_IP |
            WM8900_REG_HPCTL1_HP_CLAMP_OP;
        snd_soc_write(codec, WM8900_REG_HPCTL1, hpctl1);
        break;

    case SND_SOC_DAPM_POST_PMU:
        /* Enable the input stage */
        hpctl1 &= ~WM8900_REG_HPCTL1_HP_CLAMP_IP;
        hpctl1 |= WM8900_REG_HPCTL1_HP_SHORT |
            WM8900_REG_HPCTL1_HP_SHORT2 |
            WM8900_REG_HPCTL1_HP_IPSTAGE_ENA;
        snd_soc_write(codec, WM8900_REG_HPCTL1, hpctl1);

        msleep(400);

        /* Enable the output stage */
        hpctl1 &= ~WM8900_REG_HPCTL1_HP_CLAMP_OP;
        hpctl1 |= WM8900_REG_HPCTL1_HP_OPSTAGE_ENA;
        snd_soc_write(codec, WM8900_REG_HPCTL1, hpctl1);

        /* Remove the shorts */
        hpctl1 &= ~WM8900_REG_HPCTL1_HP_SHORT2;
        snd_soc_write(codec, WM8900_REG_HPCTL1, hpctl1);
        hpctl1 &= ~WM8900_REG_HPCTL1_HP_SHORT;
        snd_soc_write(codec, WM8900_REG_HPCTL1, hpctl1);
        break;

    case SND_SOC_DAPM_PRE_PMD:
        /* Short the output */
        hpctl1 |= WM8900_REG_HPCTL1_HP_SHORT;
        snd_soc_write(codec, WM8900_REG_HPCTL1, hpctl1);

        /* Disable the output stage */
        hpctl1 &= ~WM8900_REG_HPCTL1_HP_OPSTAGE_ENA;
        snd_soc_write(codec, WM8900_REG_HPCTL1, hpctl1);

        /* Clamp the outputs and power down input */
        hpctl1 |= WM8900_REG_HPCTL1_HP_CLAMP_IP |
            WM8900_REG_HPCTL1_HP_CLAMP_OP;
        hpctl1 &= ~WM8900_REG_HPCTL1_HP_IPSTAGE_ENA;
        snd_soc_write(codec, WM8900_REG_HPCTL1, hpctl1);
        break;

    case SND_SOC_DAPM_POST_PMD:
        /* Disable everything */
        snd_soc_write(codec, WM8900_REG_HPCTL1, 0);
        break;

    default:
        BUG();
    }

    return 0;
}

static const DECLARE_TLV_DB_SCALE(out_pga_tlv, -5700, 100, 0);

static const DECLARE_TLV_DB_SCALE(out_mix_tlv, -1500, 300, 0);

static const DECLARE_TLV_DB_SCALE(in_boost_tlv, -1200, 600, 0);

static const DECLARE_TLV_DB_SCALE(in_pga_tlv, -1200, 100, 0);

static const DECLARE_TLV_DB_SCALE(dac_boost_tlv, 0, 600, 0);

static const DECLARE_TLV_DB_SCALE(dac_tlv, -7200, 75, 1);

static const DECLARE_TLV_DB_SCALE(adc_svol_tlv, -3600, 300, 0);

static const DECLARE_TLV_DB_SCALE(adc_tlv, -7200, 75, 1);

static const char *mic_bias_level_txt[] = { "0.9*AVDD", "0.65*AVDD" };

static const struct soc_enum mic_bias_level =
SOC_ENUM_SINGLE(WM8900_REG_INCTL, 8, 2, mic_bias_level_txt);

static const char *dac_mute_rate_txt[] = { "Fast", "Slow" };

static const struct soc_enum dac_mute_rate =
SOC_ENUM_SINGLE(WM8900_REG_DACCTRL, 7, 2, dac_mute_rate_txt);

static const char *dac_deemphasis_txt[] = {
    "Disabled", "32kHz", "44.1kHz", "48kHz"
};

static const struct soc_enum dac_deemphasis =
SOC_ENUM_SINGLE(WM8900_REG_DACCTRL, 4, 4, dac_deemphasis_txt);

static const char *adc_hpf_cut_txt[] = {
    "Hi-fi mode", "Voice mode 1", "Voice mode 2", "Voice mode 3"
};

static const struct soc_enum adc_hpf_cut =
SOC_ENUM_SINGLE(WM8900_REG_ADCCTRL, 5, 4, adc_hpf_cut_txt);

static const char *lr_txt[] = {
    "Left", "Right"
};

static const struct soc_enum aifl_src =
SOC_ENUM_SINGLE(WM8900_REG_AUDIO1, 15, 2, lr_txt);

static const struct soc_enum aifr_src =
SOC_ENUM_SINGLE(WM8900_REG_AUDIO1, 14, 2, lr_txt);

static const struct soc_enum dacl_src =
SOC_ENUM_SINGLE(WM8900_REG_AUDIO2, 15, 2, lr_txt);

static const struct soc_enum dacr_src =
SOC_ENUM_SINGLE(WM8900_REG_AUDIO2, 14, 2, lr_txt);

static const char *sidetone_txt[] = {
    "Disabled", "Left ADC", "Right ADC"
};

static const struct soc_enum dacl_sidetone =
SOC_ENUM_SINGLE(WM8900_REG_SIDETONE, 2, 3, sidetone_txt);

static const struct soc_enum dacr_sidetone =
SOC_ENUM_SINGLE(WM8900_REG_SIDETONE, 0, 3, sidetone_txt);

static const struct snd_kcontrol_new wm8900_snd_controls[] = {
SOC_ENUM("Mic Bias Level", mic_bias_level),

SOC_SINGLE_TLV("Left Input PGA Volume", WM8900_REG_LINVOL, 0, 31, 0,
           in_pga_tlv),
SOC_SINGLE("Left Input PGA Switch", WM8900_REG_LINVOL, 6, 1, 1),
SOC_SINGLE("Left Input PGA ZC Switch", WM8900_REG_LINVOL, 7, 1, 0),

SOC_SINGLE_TLV("Right Input PGA Volume", WM8900_REG_RINVOL, 0, 31, 0,
           in_pga_tlv),
SOC_SINGLE("Right Input PGA Switch", WM8900_REG_RINVOL, 6, 1, 1),
SOC_SINGLE("Right Input PGA ZC Switch", WM8900_REG_RINVOL, 7, 1, 0),

SOC_SINGLE("DAC Soft Mute Switch", WM8900_REG_DACCTRL, 6, 1, 1),
SOC_ENUM("DAC Mute Rate", dac_mute_rate),
SOC_SINGLE("DAC Mono Switch", WM8900_REG_DACCTRL, 9, 1, 0),
SOC_ENUM("DAC Deemphasis", dac_deemphasis),
SOC_SINGLE("DAC Sigma-Delta Modulator Clock Switch", WM8900_REG_DACCTRL,
       12, 1, 0),

SOC_SINGLE("ADC HPF Switch", WM8900_REG_ADCCTRL, 8, 1, 0),
SOC_ENUM("ADC HPF Cut-Off", adc_hpf_cut),
SOC_DOUBLE("ADC Invert Switch", WM8900_REG_ADCCTRL, 1, 0, 1, 0),
SOC_SINGLE_TLV("Left ADC Sidetone Volume", WM8900_REG_SIDETONE, 9, 12, 0,
           adc_svol_tlv),
SOC_SINGLE_TLV("Right ADC Sidetone Volume", WM8900_REG_SIDETONE, 5, 12, 0,
           adc_svol_tlv),
SOC_ENUM("Left Digital Audio Source", aifl_src),
SOC_ENUM("Right Digital Audio Source", aifr_src),

SOC_SINGLE_TLV("DAC Input Boost Volume", WM8900_REG_AUDIO2, 10, 4, 0,
           dac_boost_tlv),
SOC_ENUM("Left DAC Source", dacl_src),
SOC_ENUM("Right DAC Source", dacr_src),
SOC_ENUM("Left DAC Sidetone", dacl_sidetone),
SOC_ENUM("Right DAC Sidetone", dacr_sidetone),
SOC_DOUBLE("DAC Invert Switch", WM8900_REG_DACCTRL, 1, 0, 1, 0),

SOC_DOUBLE_R_TLV("Digital Playback Volume",
         WM8900_REG_LDAC_DV, WM8900_REG_RDAC_DV,
         1, 96, 0, dac_tlv),
SOC_DOUBLE_R_TLV("Digital Capture Volume",
         WM8900_REG_LADC_DV, WM8900_REG_RADC_DV, 1, 119, 0, adc_tlv),

SOC_SINGLE_TLV("LINPUT3 Bypass Volume", WM8900_REG_LOUTMIXCTL1, 4, 7, 0,
           out_mix_tlv),
SOC_SINGLE_TLV("RINPUT3 Bypass Volume", WM8900_REG_ROUTMIXCTL1, 4, 7, 0,
           out_mix_tlv),
SOC_SINGLE_TLV("Left AUX Bypass Volume", WM8900_REG_AUXOUT_CTL, 4, 7, 0,
           out_mix_tlv),
SOC_SINGLE_TLV("Right AUX Bypass Volume", WM8900_REG_AUXOUT_CTL, 0, 7, 0,
           out_mix_tlv),

SOC_SINGLE_TLV("LeftIn to RightOut Mixer Volume", WM8900_REG_BYPASS1, 0, 7, 0,
           out_mix_tlv),
SOC_SINGLE_TLV("LeftIn to LeftOut Mixer Volume", WM8900_REG_BYPASS1, 4, 7, 0,
           out_mix_tlv),
SOC_SINGLE_TLV("RightIn to LeftOut Mixer Volume", WM8900_REG_BYPASS2, 0, 7, 0,
           out_mix_tlv),
SOC_SINGLE_TLV("RightIn to RightOut Mixer Volume", WM8900_REG_BYPASS2, 4, 7, 0,
           out_mix_tlv),

SOC_SINGLE_TLV("IN2L Boost Volume", WM8900_REG_INBOOSTMIX1, 0, 3, 0,
           in_boost_tlv),
SOC_SINGLE_TLV("IN3L Boost Volume", WM8900_REG_INBOOSTMIX1, 4, 3, 0,
           in_boost_tlv),
SOC_SINGLE_TLV("IN2R Boost Volume", WM8900_REG_INBOOSTMIX2, 0, 3, 0,
           in_boost_tlv),
SOC_SINGLE_TLV("IN3R Boost Volume", WM8900_REG_INBOOSTMIX2, 4, 3, 0,
           in_boost_tlv),
SOC_SINGLE_TLV("Left AUX Boost Volume", WM8900_REG_AUXBOOST, 4, 3, 0,
           in_boost_tlv),
SOC_SINGLE_TLV("Right AUX Boost Volume", WM8900_REG_AUXBOOST, 0, 3, 0,
           in_boost_tlv),

SOC_DOUBLE_R_TLV("LINEOUT1 Volume", WM8900_REG_LOUT1CTL, WM8900_REG_ROUT1CTL,
           0, 63, 0, out_pga_tlv),
SOC_DOUBLE_R("LINEOUT1 Switch", WM8900_REG_LOUT1CTL, WM8900_REG_ROUT1CTL,
         6, 1, 1),
SOC_DOUBLE_R("LINEOUT1 ZC Switch", WM8900_REG_LOUT1CTL, WM8900_REG_ROUT1CTL,
         7, 1, 0),

SOC_DOUBLE_R_TLV("LINEOUT2 Volume",
         WM8900_REG_LOUT2CTL, WM8900_REG_ROUT2CTL,
         0, 63, 0, out_pga_tlv),
SOC_DOUBLE_R("LINEOUT2 Switch",
         WM8900_REG_LOUT2CTL, WM8900_REG_ROUT2CTL, 6, 1, 1),
SOC_DOUBLE_R("LINEOUT2 ZC Switch",
         WM8900_REG_LOUT2CTL, WM8900_REG_ROUT2CTL, 7, 1, 0),
SOC_SINGLE("LINEOUT2 LP -12dB", WM8900_REG_LOUTMIXCTL1,
       0, 1, 1),

};

static const struct snd_kcontrol_new wm8900_dapm_loutput2_control =
SOC_DAPM_SINGLE("LINEOUT2L Switch", WM8900_REG_POWER3, 6, 1, 0);

static const struct snd_kcontrol_new wm8900_dapm_routput2_control =
SOC_DAPM_SINGLE("LINEOUT2R Switch", WM8900_REG_POWER3, 5, 1, 0);

static const struct snd_kcontrol_new wm8900_loutmix_controls[] = {
SOC_DAPM_SINGLE("LINPUT3 Bypass Switch", WM8900_REG_LOUTMIXCTL1, 7, 1, 0),
SOC_DAPM_SINGLE("AUX Bypass Switch", WM8900_REG_AUXOUT_CTL, 7, 1, 0),
SOC_DAPM_SINGLE("Left Input Mixer Switch", WM8900_REG_BYPASS1, 7, 1, 0),
SOC_DAPM_SINGLE("Right Input Mixer Switch", WM8900_REG_BYPASS2, 3, 1, 0),
SOC_DAPM_SINGLE("DACL Switch", WM8900_REG_LOUTMIXCTL1, 8, 1, 0),
};

static const struct snd_kcontrol_new wm8900_routmix_controls[] = {
SOC_DAPM_SINGLE("RINPUT3 Bypass Switch", WM8900_REG_ROUTMIXCTL1, 7, 1, 0),
SOC_DAPM_SINGLE("AUX Bypass Switch", WM8900_REG_AUXOUT_CTL, 3, 1, 0),
SOC_DAPM_SINGLE("Left Input Mixer Switch", WM8900_REG_BYPASS1, 3, 1, 0),
SOC_DAPM_SINGLE("Right Input Mixer Switch", WM8900_REG_BYPASS2, 7, 1, 0),
SOC_DAPM_SINGLE("DACR Switch", WM8900_REG_ROUTMIXCTL1, 8, 1, 0),
};

static const struct snd_kcontrol_new wm8900_linmix_controls[] = {
SOC_DAPM_SINGLE("LINPUT2 Switch", WM8900_REG_INBOOSTMIX1, 2, 1, 1),
SOC_DAPM_SINGLE("LINPUT3 Switch", WM8900_REG_INBOOSTMIX1, 6, 1, 1),
SOC_DAPM_SINGLE("AUX Switch", WM8900_REG_AUXBOOST, 6, 1, 1),
SOC_DAPM_SINGLE("Input PGA Switch", WM8900_REG_ADCPATH, 6, 1, 0),
};

static const struct snd_kcontrol_new wm8900_rinmix_controls[] = {
SOC_DAPM_SINGLE("RINPUT2 Switch", WM8900_REG_INBOOSTMIX2, 2, 1, 1),
SOC_DAPM_SINGLE("RINPUT3 Switch", WM8900_REG_INBOOSTMIX2, 6, 1, 1),
SOC_DAPM_SINGLE("AUX Switch", WM8900_REG_AUXBOOST, 2, 1, 1),
SOC_DAPM_SINGLE("Input PGA Switch", WM8900_REG_ADCPATH, 2, 1, 0),
};

static const struct snd_kcontrol_new wm8900_linpga_controls[] = {
SOC_DAPM_SINGLE("LINPUT1 Switch", WM8900_REG_INCTL, 6, 1, 0),
SOC_DAPM_SINGLE("LINPUT2 Switch", WM8900_REG_INCTL, 5, 1, 0),
SOC_DAPM_SINGLE("LINPUT3 Switch", WM8900_REG_INCTL, 4, 1, 0),
};

static const struct snd_kcontrol_new wm8900_rinpga_controls[] = {
SOC_DAPM_SINGLE("RINPUT1 Switch", WM8900_REG_INCTL, 2, 1, 0),
SOC_DAPM_SINGLE("RINPUT2 Switch", WM8900_REG_INCTL, 1, 1, 0),
SOC_DAPM_SINGLE("RINPUT3 Switch", WM8900_REG_INCTL, 0, 1, 0),
};

static const char *wm8900_lp_mux[] = { "Disabled", "Enabled" };

static const struct soc_enum wm8900_lineout2_lp_mux =
SOC_ENUM_SINGLE(WM8900_REG_LOUTMIXCTL1, 1, 2, wm8900_lp_mux);

static const struct snd_kcontrol_new wm8900_lineout2_lp =
SOC_DAPM_ENUM("Route", wm8900_lineout2_lp_mux);

static const struct snd_soc_dapm_widget wm8900_dapm_widgets[] = {

/* Externally visible pins */
SND_SOC_DAPM_OUTPUT("LINEOUT1L"),
SND_SOC_DAPM_OUTPUT("LINEOUT1R"),
SND_SOC_DAPM_OUTPUT("LINEOUT2L"),
SND_SOC_DAPM_OUTPUT("LINEOUT2R"),
SND_SOC_DAPM_OUTPUT("HP_L"),
SND_SOC_DAPM_OUTPUT("HP_R"),

SND_SOC_DAPM_INPUT("RINPUT1"),
SND_SOC_DAPM_INPUT("LINPUT1"),
SND_SOC_DAPM_INPUT("RINPUT2"),
SND_SOC_DAPM_INPUT("LINPUT2"),
SND_SOC_DAPM_INPUT("RINPUT3"),
SND_SOC_DAPM_INPUT("LINPUT3"),
SND_SOC_DAPM_INPUT("AUX"),

SND_SOC_DAPM_VMID("VMID"),

/* Input */
SND_SOC_DAPM_MIXER("Left Input PGA", WM8900_REG_POWER2, 3, 0,
           wm8900_linpga_controls,
           ARRAY_SIZE(wm8900_linpga_controls)),
SND_SOC_DAPM_MIXER("Right Input PGA", WM8900_REG_POWER2, 2, 0,
           wm8900_rinpga_controls,
           ARRAY_SIZE(wm8900_rinpga_controls)),

SND_SOC_DAPM_MIXER("Left Input Mixer", WM8900_REG_POWER2, 5, 0,
           wm8900_linmix_controls,
           ARRAY_SIZE(wm8900_linmix_controls)),
SND_SOC_DAPM_MIXER("Right Input Mixer", WM8900_REG_POWER2, 4, 0,
           wm8900_rinmix_controls,
           ARRAY_SIZE(wm8900_rinmix_controls)),

SND_SOC_DAPM_SUPPLY("Mic Bias", WM8900_REG_POWER1, 4, 0, NULL, 0),

SND_SOC_DAPM_ADC("ADCL", "Left HiFi Capture", WM8900_REG_POWER2, 1, 0),
SND_SOC_DAPM_ADC("ADCR", "Right HiFi Capture", WM8900_REG_POWER2, 0, 0),

/* Output */
SND_SOC_DAPM_DAC("DACL", "Left HiFi Playback", WM8900_REG_POWER3, 1, 0),
SND_SOC_DAPM_DAC("DACR", "Right HiFi Playback", WM8900_REG_POWER3, 0, 0),

SND_SOC_DAPM_PGA_E("Headphone Amplifier", WM8900_REG_POWER3, 7, 0, NULL, 0,
           wm8900_hp_event,
           SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMU |
           SND_SOC_DAPM_PRE_PMD | SND_SOC_DAPM_POST_PMD),

SND_SOC_DAPM_PGA("LINEOUT1L PGA", WM8900_REG_POWER2, 8, 0, NULL, 0),
SND_SOC_DAPM_PGA("LINEOUT1R PGA", WM8900_REG_POWER2, 7, 0, NULL, 0),

SND_SOC_DAPM_MUX("LINEOUT2 LP", SND_SOC_NOPM, 0, 0, &wm8900_lineout2_lp),
SND_SOC_DAPM_PGA("LINEOUT2L PGA", WM8900_REG_POWER3, 6, 0, NULL, 0),
SND_SOC_DAPM_PGA("LINEOUT2R PGA", WM8900_REG_POWER3, 5, 0, NULL, 0),

SND_SOC_DAPM_MIXER("Left Output Mixer", WM8900_REG_POWER3, 3, 0,
           wm8900_loutmix_controls,
           ARRAY_SIZE(wm8900_loutmix_controls)),
SND_SOC_DAPM_MIXER("Right Output Mixer", WM8900_REG_POWER3, 2, 0,
           wm8900_routmix_controls,
           ARRAY_SIZE(wm8900_routmix_controls)),
};

/* Target, Path, Source */
static const struct snd_soc_dapm_route wm8900_dapm_routes[] = {
/* Inputs */
{"Left Input PGA", "LINPUT1 Switch", "LINPUT1"},
{"Left Input PGA", "LINPUT2 Switch", "LINPUT2"},
{"Left Input PGA", "LINPUT3 Switch", "LINPUT3"},

{"Right Input PGA", "RINPUT1 Switch", "RINPUT1"},
{"Right Input PGA", "RINPUT2 Switch", "RINPUT2"},
{"Right Input PGA", "RINPUT3 Switch", "RINPUT3"},

{"Left Input Mixer", "LINPUT2 Switch", "LINPUT2"},
{"Left Input Mixer", "LINPUT3 Switch", "LINPUT3"},
{"Left Input Mixer", "AUX Switch", "AUX"},
{"Left Input Mixer", "Input PGA Switch", "Left Input PGA"},

{"Right Input Mixer", "RINPUT2 Switch", "RINPUT2"},
{"Right Input Mixer", "RINPUT3 Switch", "RINPUT3"},
{"Right Input Mixer", "AUX Switch", "AUX"},
{"Right Input Mixer", "Input PGA Switch", "Right Input PGA"},

{"ADCL", NULL, "Left Input Mixer"},
{"ADCR", NULL, "Right Input Mixer"},

/* Outputs */
{"LINEOUT1L", NULL, "LINEOUT1L PGA"},
{"LINEOUT1L PGA", NULL, "Left Output Mixer"},
{"LINEOUT1R", NULL, "LINEOUT1R PGA"},
{"LINEOUT1R PGA", NULL, "Right Output Mixer"},

{"LINEOUT2L PGA", NULL, "Left Output Mixer"},
{"LINEOUT2 LP", "Disabled", "LINEOUT2L PGA"},
{"LINEOUT2 LP", "Enabled", "Left Output Mixer"},
{"LINEOUT2L", NULL, "LINEOUT2 LP"},

{"LINEOUT2R PGA", NULL, "Right Output Mixer"},
{"LINEOUT2 LP", "Disabled", "LINEOUT2R PGA"},
{"LINEOUT2 LP", "Enabled", "Right Output Mixer"},
{"LINEOUT2R", NULL, "LINEOUT2 LP"},

{"Left Output Mixer", "LINPUT3 Bypass Switch", "LINPUT3"},
{"Left Output Mixer", "AUX Bypass Switch", "AUX"},
{"Left Output Mixer", "Left Input Mixer Switch", "Left Input Mixer"},
{"Left Output Mixer", "Right Input Mixer Switch", "Right Input Mixer"},
{"Left Output Mixer", "DACL Switch", "DACL"},

{"Right Output Mixer", "RINPUT3 Bypass Switch", "RINPUT3"},
{"Right Output Mixer", "AUX Bypass Switch", "AUX"},
{"Right Output Mixer", "Left Input Mixer Switch", "Left Input Mixer"},
{"Right Output Mixer", "Right Input Mixer Switch", "Right Input Mixer"},
{"Right Output Mixer", "DACR Switch", "DACR"},

/* Note that the headphone output stage needs to be connected
 * externally to LINEOUT2 via DC blocking capacitors.  Other
 * configurations are not supported.
 *
 * Note also that left and right headphone paths are treated as a
 * mono path.
 */
{"Headphone Amplifier", NULL, "LINEOUT2 LP"},
{"Headphone Amplifier", NULL, "LINEOUT2 LP"},
{"HP_L", NULL, "Headphone Amplifier"},
{"HP_R", NULL, "Headphone Amplifier"},
};

static int wm8900_hw_params(struct snd_pcm_substream *substream,
    struct snd_pcm_hw_params *params,
    struct snd_soc_dai *dai)
{
    struct snd_soc_codec *codec = dai->codec;
    u16 reg;

    reg = snd_soc_read(codec, WM8900_REG_AUDIO1) & ~0x60;

    switch (params_format(params)) {
    case SNDRV_PCM_FORMAT_S16_LE:
        break;
    case SNDRV_PCM_FORMAT_S20_3LE:
        reg |= 0x20;
        break;
    case SNDRV_PCM_FORMAT_S24_LE:
        reg |= 0x40;
        break;
    case SNDRV_PCM_FORMAT_S32_LE:
        reg |= 0x60;
        break;
    default:
        return -EINVAL;
    }

    snd_soc_write(codec, WM8900_REG_AUDIO1, reg);

    if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
        reg = snd_soc_read(codec, WM8900_REG_DACCTRL);

        if (params_rate(params) <= 24000)
            reg |= WM8900_REG_DACCTRL_DAC_SB_FILT;
        else
            reg &= ~WM8900_REG_DACCTRL_DAC_SB_FILT;

        snd_soc_write(codec, WM8900_REG_DACCTRL, reg);
    }

    return 0;
}

/* FLL divisors */
struct _fll_div {
    u16 fll_ratio;
    u16 fllclk_div;
    u16 fll_slow_lock_ref;
    u16 n;
    u16 k;
};

/* The size in bits of the FLL divide multiplied by 10
 * to allow rounding later */
#define FIXED_FLL_SIZE ((1 << 16) * 10)

static int fll_factors(struct _fll_div *fll_div, unsigned int Fref,
               unsigned int Fout)
{
    u64 Kpart;
    unsigned int K, Ndiv, Nmod, target;
    unsigned int div;

    BUG_ON(!Fout);

    /* The FLL must run at 90-100MHz which is then scaled down to
     * the output value by FLLCLK_DIV. */
    target = Fout;
    div = 1;
    while (target < 90000000) {
        div *= 2;
        target *= 2;
    }

    if (target > 100000000)
        printk(KERN_WARNING "wm8900: FLL rate %u out of range, Fref=%u"
               " Fout=%u\n", target, Fref, Fout);
    if (div > 32) {
        printk(KERN_ERR "wm8900: Invalid FLL division rate %u, "
               "Fref=%u, Fout=%u, target=%u\n",
               div, Fref, Fout, target);
        return -EINVAL;
    }

    fll_div->fllclk_div = div >> 2;

    if (Fref < 48000)
        fll_div->fll_slow_lock_ref = 1;
    else
        fll_div->fll_slow_lock_ref = 0;

    Ndiv = target / Fref;

    if (Fref < 1000000)
        fll_div->fll_ratio = 8;
    else
        fll_div->fll_ratio = 1;

    fll_div->n = Ndiv / fll_div->fll_ratio;
    Nmod = (target / fll_div->fll_ratio) % Fref;

    /* Calculate fractional part - scale up so we can round. */
    Kpart = FIXED_FLL_SIZE * (long long)Nmod;

    do_div(Kpart, Fref);

    K = Kpart & 0xFFFFFFFF;

    if ((K % 10) >= 5)
        K += 5;

    /* Move down to proper range now rounding is done */
    fll_div->k = K / 10;

    BUG_ON(target != Fout * (fll_div->fllclk_div << 2));
    BUG_ON(!K && target != Fref * fll_div->fll_ratio * fll_div->n);

    return 0;
}

static int wm8900_set_fll(struct snd_soc_codec *codec,
    int fll_id, unsigned int freq_in, unsigned int freq_out)
{
    struct wm8900_priv *wm8900 = snd_soc_codec_get_drvdata(codec);
    struct _fll_div fll_div;

    if (wm8900->fll_in == freq_in && wm8900->fll_out == freq_out)
        return 0;

    /* The digital side should be disabled during any change. */
    snd_soc_update_bits(codec, WM8900_REG_POWER1,
                WM8900_REG_POWER1_FLL_ENA, 0);

    /* Disable the FLL? */
    if (!freq_in || !freq_out) {
        snd_soc_update_bits(codec, WM8900_REG_CLOCKING1,
                    WM8900_REG_CLOCKING1_MCLK_SRC, 0);
        snd_soc_update_bits(codec, WM8900_REG_FLLCTL1,
                    WM8900_REG_FLLCTL1_OSC_ENA, 0);
        wm8900->fll_in = freq_in;
        wm8900->fll_out = freq_out;

        return 0;
    }

    if (fll_factors(&fll_div, freq_in, freq_out) != 0)
        goto reenable;

    wm8900->fll_in = freq_in;
    wm8900->fll_out = freq_out;

    /* The osclilator *MUST* be enabled before we enable the
     * digital circuit. */
    snd_soc_write(codec, WM8900_REG_FLLCTL1,
             fll_div.fll_ratio | WM8900_REG_FLLCTL1_OSC_ENA);

    snd_soc_write(codec, WM8900_REG_FLLCTL4, fll_div.n >> 5);
    snd_soc_write(codec, WM8900_REG_FLLCTL5,
             (fll_div.fllclk_div << 6) | (fll_div.n & 0x1f));

    if (fll_div.k) {
        snd_soc_write(codec, WM8900_REG_FLLCTL2,
                 (fll_div.k >> 8) | 0x100);
        snd_soc_write(codec, WM8900_REG_FLLCTL3, fll_div.k & 0xff);
    } else
        snd_soc_write(codec, WM8900_REG_FLLCTL2, 0);

    if (fll_div.fll_slow_lock_ref)
        snd_soc_write(codec, WM8900_REG_FLLCTL6,
                 WM8900_REG_FLLCTL6_FLL_SLOW_LOCK_REF);
    else
        snd_soc_write(codec, WM8900_REG_FLLCTL6, 0);

    snd_soc_update_bits(codec, WM8900_REG_POWER1,
                WM8900_REG_POWER1_FLL_ENA,
                WM8900_REG_POWER1_FLL_ENA);

reenable:
    snd_soc_update_bits(codec, WM8900_REG_CLOCKING1,
                WM8900_REG_CLOCKING1_MCLK_SRC,
                WM8900_REG_CLOCKING1_MCLK_SRC);
    return 0;
}

static int wm8900_set_dai_pll(struct snd_soc_dai *codec_dai, int pll_id,
        int source, unsigned int freq_in, unsigned int freq_out)
{
    return wm8900_set_fll(codec_dai->codec, pll_id, freq_in, freq_out);
}

static int wm8900_set_dai_clkdiv(struct snd_soc_dai *codec_dai,
                 int div_id, int div)
{
    struct snd_soc_codec *codec = codec_dai->codec;

    switch (div_id) {
    case WM8900_BCLK_DIV:
        snd_soc_update_bits(codec, WM8900_REG_CLOCKING1,
                    WM8900_REG_CLOCKING1_BCLK_MASK, div);
        break;
    case WM8900_OPCLK_DIV:
        snd_soc_update_bits(codec, WM8900_REG_CLOCKING1,
                    WM8900_REG_CLOCKING1_OPCLK_MASK, div);
        break;
    case WM8900_DAC_LRCLK:
        snd_soc_update_bits(codec, WM8900_REG_AUDIO4,
                    WM8900_LRC_MASK, div);
        break;
    case WM8900_ADC_LRCLK:
        snd_soc_update_bits(codec, WM8900_REG_AUDIO3,
                    WM8900_LRC_MASK, div);
        break;
    case WM8900_DAC_CLKDIV:
        snd_soc_update_bits(codec, WM8900_REG_CLOCKING2,
                    WM8900_REG_CLOCKING2_DAC_CLKDIV, div);
        break;
    case WM8900_ADC_CLKDIV:
        snd_soc_update_bits(codec, WM8900_REG_CLOCKING2,
                    WM8900_REG_CLOCKING2_ADC_CLKDIV, div);
        break;
    case WM8900_LRCLK_MODE:
        snd_soc_update_bits(codec, WM8900_REG_DACCTRL,
                    WM8900_REG_DACCTRL_AIF_LRCLKRATE, div);
        break;
    default:
        return -EINVAL;
    }

    return 0;
}


static int wm8900_set_dai_fmt(struct snd_soc_dai *codec_dai,
                  unsigned int fmt)
{
    struct snd_soc_codec *codec = codec_dai->codec;
    unsigned int clocking1, aif1, aif3, aif4;

    clocking1 = snd_soc_read(codec, WM8900_REG_CLOCKING1);
    aif1 = snd_soc_read(codec, WM8900_REG_AUDIO1);
    aif3 = snd_soc_read(codec, WM8900_REG_AUDIO3);
    aif4 = snd_soc_read(codec, WM8900_REG_AUDIO4);

    /* set master/slave audio interface */
    switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
    case SND_SOC_DAIFMT_CBS_CFS:
        clocking1 &= ~WM8900_REG_CLOCKING1_BCLK_DIR;
        aif3 &= ~WM8900_REG_AUDIO3_ADCLRC_DIR;
        aif4 &= ~WM8900_REG_AUDIO4_DACLRC_DIR;
        break;
    case SND_SOC_DAIFMT_CBS_CFM:
        clocking1 &= ~WM8900_REG_CLOCKING1_BCLK_DIR;
        aif3 |= WM8900_REG_AUDIO3_ADCLRC_DIR;
        aif4 |= WM8900_REG_AUDIO4_DACLRC_DIR;
        break;
    case SND_SOC_DAIFMT_CBM_CFM:
        clocking1 |= WM8900_REG_CLOCKING1_BCLK_DIR;
        aif3 |= WM8900_REG_AUDIO3_ADCLRC_DIR;
        aif4 |= WM8900_REG_AUDIO4_DACLRC_DIR;
        break;
    case SND_SOC_DAIFMT_CBM_CFS:
        clocking1 |= WM8900_REG_CLOCKING1_BCLK_DIR;
        aif3 &= ~WM8900_REG_AUDIO3_ADCLRC_DIR;
        aif4 &= ~WM8900_REG_AUDIO4_DACLRC_DIR;
        break;
    default:
        return -EINVAL;
    }

    switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
    case SND_SOC_DAIFMT_DSP_A:
        aif1 |= WM8900_REG_AUDIO1_AIF_FMT_MASK;
        aif1 &= ~WM8900_REG_AUDIO1_LRCLK_INV;
        break;
    case SND_SOC_DAIFMT_DSP_B:
        aif1 |= WM8900_REG_AUDIO1_AIF_FMT_MASK;
        aif1 |= WM8900_REG_AUDIO1_LRCLK_INV;
        break;
    case SND_SOC_DAIFMT_I2S:
        aif1 &= ~WM8900_REG_AUDIO1_AIF_FMT_MASK;
        aif1 |= 0x10;
        break;
    case SND_SOC_DAIFMT_RIGHT_J:
        aif1 &= ~WM8900_REG_AUDIO1_AIF_FMT_MASK;
        break;
    case SND_SOC_DAIFMT_LEFT_J:
        aif1 &= ~WM8900_REG_AUDIO1_AIF_FMT_MASK;
        aif1 |= 0x8;
        break;
    default:
        return -EINVAL;
    }

    /* Clock inversion */
    switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
    case SND_SOC_DAIFMT_DSP_A:
    case SND_SOC_DAIFMT_DSP_B:
        /* frame inversion not valid for DSP modes */
        switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
        case SND_SOC_DAIFMT_NB_NF:
            aif1 &= ~WM8900_REG_AUDIO1_BCLK_INV;
            break;
        case SND_SOC_DAIFMT_IB_NF:
            aif1 |= WM8900_REG_AUDIO1_BCLK_INV;
            break;
        default:
            return -EINVAL;
        }
        break;
    case SND_SOC_DAIFMT_I2S:
    case SND_SOC_DAIFMT_RIGHT_J:
    case SND_SOC_DAIFMT_LEFT_J:
        switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
        case SND_SOC_DAIFMT_NB_NF:
            aif1 &= ~WM8900_REG_AUDIO1_BCLK_INV;
            aif1 &= ~WM8900_REG_AUDIO1_LRCLK_INV;
            break;
        case SND_SOC_DAIFMT_IB_IF:
            aif1 |= WM8900_REG_AUDIO1_BCLK_INV;
            aif1 |= WM8900_REG_AUDIO1_LRCLK_INV;
            break;
        case SND_SOC_DAIFMT_IB_NF:
            aif1 |= WM8900_REG_AUDIO1_BCLK_INV;
            aif1 &= ~WM8900_REG_AUDIO1_LRCLK_INV;
            break;
        case SND_SOC_DAIFMT_NB_IF:
            aif1 &= ~WM8900_REG_AUDIO1_BCLK_INV;
            aif1 |= WM8900_REG_AUDIO1_LRCLK_INV;
            break;
        default:
            return -EINVAL;
        }
        break;
    default:
        return -EINVAL;
    }

    snd_soc_write(codec, WM8900_REG_CLOCKING1, clocking1);
    snd_soc_write(codec, WM8900_REG_AUDIO1, aif1);
    snd_soc_write(codec, WM8900_REG_AUDIO3, aif3);
    snd_soc_write(codec, WM8900_REG_AUDIO4, aif4);

    return 0;
}

static int wm8900_digital_mute(struct snd_soc_dai *codec_dai, int mute)
{
    struct snd_soc_codec *codec = codec_dai->codec;
    u16 reg;

    reg = snd_soc_read(codec, WM8900_REG_DACCTRL);

    if (mute)
        reg |= WM8900_REG_DACCTRL_MUTE;
    else
        reg &= ~WM8900_REG_DACCTRL_MUTE;

    snd_soc_write(codec, WM8900_REG_DACCTRL, reg);

    return 0;
}

#define WM8900_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)

#define WM8900_PCM_FORMATS \
    (SNDRV_PCM_FORMAT_S16_LE | SNDRV_PCM_FORMAT_S20_3LE | \
     SNDRV_PCM_FORMAT_S24_LE)

static const struct snd_soc_dai_ops wm8900_dai_ops = {
    .hw_params  = wm8900_hw_params,
    .set_clkdiv = wm8900_set_dai_clkdiv,
    .set_pll    = wm8900_set_dai_pll,
    .set_fmt    = wm8900_set_dai_fmt,
    .digital_mute   = wm8900_digital_mute,
};

static struct snd_soc_dai_driver wm8900_dai = {
    .name = "wm8900-hifi",
    .playback = {
        .stream_name = "HiFi Playback",
        .channels_min = 1,
        .channels_max = 2,
        .rates = WM8900_RATES,
        .formats = WM8900_PCM_FORMATS,
    },
    .capture = {
        .stream_name = "HiFi Capture",
        .channels_min = 1,
        .channels_max = 2,
        .rates = WM8900_RATES,
        .formats = WM8900_PCM_FORMATS,
     },
    .ops = &wm8900_dai_ops,
};

static int wm8900_set_bias_level(struct snd_soc_codec *codec,
                 enum snd_soc_bias_level level)
{
    u16 reg;

    switch (level) {
    case SND_SOC_BIAS_ON:
        /* Enable thermal shutdown */
        snd_soc_update_bits(codec, WM8900_REG_GPIO,
                    WM8900_REG_GPIO_TEMP_ENA,
                    WM8900_REG_GPIO_TEMP_ENA);
        snd_soc_update_bits(codec, WM8900_REG_ADDCTL,
                    WM8900_REG_ADDCTL_TEMP_SD,
                    WM8900_REG_ADDCTL_TEMP_SD);
        break;

    case SND_SOC_BIAS_PREPARE:
        break;

    case SND_SOC_BIAS_STANDBY:
        /* Charge capacitors if initial power up */
        if (codec->dapm.bias_level == SND_SOC_BIAS_OFF) {
            /* STARTUP_BIAS_ENA on */
            snd_soc_write(codec, WM8900_REG_POWER1,
                     WM8900_REG_POWER1_STARTUP_BIAS_ENA);

            /* Startup bias mode */
            snd_soc_write(codec, WM8900_REG_ADDCTL,
                     WM8900_REG_ADDCTL_BIAS_SRC |
                     WM8900_REG_ADDCTL_VMID_SOFTST);

            /* VMID 2x50k */
            snd_soc_write(codec, WM8900_REG_POWER1,
                     WM8900_REG_POWER1_STARTUP_BIAS_ENA | 0x1);

            /* Allow capacitors to charge */
            schedule_timeout_interruptible(msecs_to_jiffies(400));

            /* Enable bias */
            snd_soc_write(codec, WM8900_REG_POWER1,
                     WM8900_REG_POWER1_STARTUP_BIAS_ENA |
                     WM8900_REG_POWER1_BIAS_ENA | 0x1);

            snd_soc_write(codec, WM8900_REG_ADDCTL, 0);

            snd_soc_write(codec, WM8900_REG_POWER1,
                     WM8900_REG_POWER1_BIAS_ENA | 0x1);
        }

        reg = snd_soc_read(codec, WM8900_REG_POWER1);
        snd_soc_write(codec, WM8900_REG_POWER1,
                 (reg & WM8900_REG_POWER1_FLL_ENA) |
                 WM8900_REG_POWER1_BIAS_ENA | 0x1);
        snd_soc_write(codec, WM8900_REG_POWER2,
                 WM8900_REG_POWER2_SYSCLK_ENA);
        snd_soc_write(codec, WM8900_REG_POWER3, 0);
        break;

    case SND_SOC_BIAS_OFF:
        /* Startup bias enable */
        reg = snd_soc_read(codec, WM8900_REG_POWER1);
        snd_soc_write(codec, WM8900_REG_POWER1,
                 reg & WM8900_REG_POWER1_STARTUP_BIAS_ENA);
        snd_soc_write(codec, WM8900_REG_ADDCTL,
                 WM8900_REG_ADDCTL_BIAS_SRC |
                 WM8900_REG_ADDCTL_VMID_SOFTST);

        /* Discharge caps */
        snd_soc_write(codec, WM8900_REG_POWER1,
                 WM8900_REG_POWER1_STARTUP_BIAS_ENA);
        schedule_timeout_interruptible(msecs_to_jiffies(500));

        /* Remove clamp */
        snd_soc_write(codec, WM8900_REG_HPCTL1, 0);

        /* Power down */
        snd_soc_write(codec, WM8900_REG_ADDCTL, 0);
        snd_soc_write(codec, WM8900_REG_POWER1, 0);
        snd_soc_write(codec, WM8900_REG_POWER2, 0);
        snd_soc_write(codec, WM8900_REG_POWER3, 0);

        /* Need to let things settle before stopping the clock
         * to ensure that restart works, see "Stopping the
         * master clock" in the datasheet. */
        schedule_timeout_interruptible(msecs_to_jiffies(1));
        snd_soc_write(codec, WM8900_REG_POWER2,
                 WM8900_REG_POWER2_SYSCLK_ENA);
        break;
    }
    codec->dapm.bias_level = level;
    return 0;
}

static int wm8900_suspend(struct snd_soc_codec *codec)
{
    struct wm8900_priv *wm8900 = snd_soc_codec_get_drvdata(codec);
    int fll_out = wm8900->fll_out;
    int fll_in  = wm8900->fll_in;
    int ret;

    /* Stop the FLL in an orderly fashion */
    ret = wm8900_set_fll(codec, 0, 0, 0);
    if (ret != 0) {
        dev_err(codec->dev, "Failed to stop FLL\n");
        return ret;
    }

    wm8900->fll_out = fll_out;
    wm8900->fll_in = fll_in;

    wm8900_set_bias_level(codec, SND_SOC_BIAS_OFF);

    return 0;
}

static int wm8900_resume(struct snd_soc_codec *codec)
{
    struct wm8900_priv *wm8900 = snd_soc_codec_get_drvdata(codec);
    int ret;

    wm8900_reset(codec);

    ret = regcache_sync(wm8900->regmap);
    if (ret != 0) {
        dev_err(codec->dev, "Failed to restore cache: %d\n", ret);
        return ret;
    }

    wm8900_set_bias_level(codec, SND_SOC_BIAS_STANDBY);

    /* Restart the FLL? */
    if (wm8900->fll_out) {
        int fll_out = wm8900->fll_out;
        int fll_in  = wm8900->fll_in;

        wm8900->fll_in = 0;
        wm8900->fll_out = 0;

        ret = wm8900_set_fll(codec, 0, fll_in, fll_out);
        if (ret != 0) {
            dev_err(codec->dev, "Failed to restart FLL\n");
            return ret;
        }
    }

    return 0;
}

static int wm8900_probe(struct snd_soc_codec *codec)
{
    int ret = 0, reg;

    ret = snd_soc_codec_set_cache_io(codec, 8, 16, SND_SOC_REGMAP);
    if (ret != 0) {
        dev_err(codec->dev, "Failed to set cache I/O: %d\n", ret);
        return ret;
    }

    reg = snd_soc_read(codec, WM8900_REG_ID);
    if (reg != 0x8900) {
        dev_err(codec->dev, "Device is not a WM8900 - ID %x\n", reg);
        return -ENODEV;
    }

    wm8900_reset(codec);

    /* Turn the chip on */
    wm8900_set_bias_level(codec, SND_SOC_BIAS_STANDBY);

    /* Latch the volume update bits */
    snd_soc_update_bits(codec, WM8900_REG_LINVOL, 0x100, 0x100);
    snd_soc_update_bits(codec, WM8900_REG_RINVOL, 0x100, 0x100);
    snd_soc_update_bits(codec, WM8900_REG_LOUT1CTL, 0x100, 0x100);
    snd_soc_update_bits(codec, WM8900_REG_ROUT1CTL, 0x100, 0x100);
    snd_soc_update_bits(codec, WM8900_REG_LOUT2CTL, 0x100, 0x100);
    snd_soc_update_bits(codec, WM8900_REG_ROUT2CTL, 0x100, 0x100);
    snd_soc_update_bits(codec, WM8900_REG_LDAC_DV, 0x100, 0x100);
    snd_soc_update_bits(codec, WM8900_REG_RDAC_DV, 0x100, 0x100);
    snd_soc_update_bits(codec, WM8900_REG_LADC_DV, 0x100, 0x100);
    snd_soc_update_bits(codec, WM8900_REG_RADC_DV, 0x100, 0x100);

    /* Set the DAC and mixer output bias */
    snd_soc_write(codec, WM8900_REG_OUTBIASCTL, 0x81);

    return 0;
}

/* power down chip */
static int wm8900_remove(struct snd_soc_codec *codec)
{
    wm8900_set_bias_level(codec, SND_SOC_BIAS_OFF);
    return 0;
}

static struct snd_soc_codec_driver soc_codec_dev_wm8900 = {
    .probe =    wm8900_probe,
    .remove =   wm8900_remove,
    .suspend =  wm8900_suspend,
    .resume =   wm8900_resume,
    .set_bias_level = wm8900_set_bias_level,

    .controls = wm8900_snd_controls,
    .num_controls = ARRAY_SIZE(wm8900_snd_controls),
    .dapm_widgets = wm8900_dapm_widgets,
    .num_dapm_widgets = ARRAY_SIZE(wm8900_dapm_widgets),
    .dapm_routes = wm8900_dapm_routes,
    .num_dapm_routes = ARRAY_SIZE(wm8900_dapm_routes),
};

static const struct regmap_config wm8900_regmap = {
    .reg_bits = 8,
    .val_bits = 16,
    .max_register = WM8900_MAXREG,

    .reg_defaults = wm8900_reg_defaults,
    .num_reg_defaults = ARRAY_SIZE(wm8900_reg_defaults),
    .cache_type = REGCACHE_RBTREE,

    .volatile_reg = wm8900_volatile_register,
};

#if defined(CONFIG_SPI_MASTER)
static int __devinit wm8900_spi_probe(struct spi_device *spi)
{
    struct wm8900_priv *wm8900;
    int ret;

    wm8900 = devm_kzalloc(&spi->dev, sizeof(struct wm8900_priv),
                  GFP_KERNEL);
    if (wm8900 == NULL)
        return -ENOMEM;

    wm8900->regmap = devm_regmap_init_spi(spi, &wm8900_regmap);
    if (IS_ERR(wm8900->regmap))
        return PTR_ERR(wm8900->regmap);

    spi_set_drvdata(spi, wm8900);

    ret = snd_soc_register_codec(&spi->dev,
            &soc_codec_dev_wm8900, &wm8900_dai, 1);

    return ret;
}

static int __devexit wm8900_spi_remove(struct spi_device *spi)
{
    snd_soc_unregister_codec(&spi->dev);
    return 0;
}

static struct spi_driver wm8900_spi_driver = {
    .driver = {
        .name   = "wm8900",
        .owner  = THIS_MODULE,
    },
    .probe      = wm8900_spi_probe,
    .remove     = __devexit_p(wm8900_spi_remove),
};
#endif /* CONFIG_SPI_MASTER */

#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
static __devinit int wm8900_i2c_probe(struct i2c_client *i2c,
                      const struct i2c_device_id *id)
{
    struct wm8900_priv *wm8900;
    int ret;

    wm8900 = devm_kzalloc(&i2c->dev, sizeof(struct wm8900_priv),
                  GFP_KERNEL);
    if (wm8900 == NULL)
        return -ENOMEM;

    wm8900->regmap = devm_regmap_init_i2c(i2c, &wm8900_regmap);
    if (IS_ERR(wm8900->regmap))
        return PTR_ERR(wm8900->regmap);

    i2c_set_clientdata(i2c, wm8900);

    ret =  snd_soc_register_codec(&i2c->dev,
            &soc_codec_dev_wm8900, &wm8900_dai, 1);

    return ret;
}

static __devexit int wm8900_i2c_remove(struct i2c_client *client)
{
    snd_soc_unregister_codec(&client->dev);
    return 0;
}

static const struct i2c_device_id wm8900_i2c_id[] = {
    { "wm8900", 0 },
    { }
};
MODULE_DEVICE_TABLE(i2c, wm8900_i2c_id);

static struct i2c_driver wm8900_i2c_driver = {
    .driver = {
        .name = "wm8900",
        .owner = THIS_MODULE,
    },
    .probe =    wm8900_i2c_probe,
    .remove =   __devexit_p(wm8900_i2c_remove),
    .id_table = wm8900_i2c_id,
};
#endif

static int __init wm8900_modinit(void)
{
    int ret = 0;
#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
    ret = i2c_add_driver(&wm8900_i2c_driver);
    if (ret != 0) {
        printk(KERN_ERR "Failed to register wm8900 I2C driver: %d\n",
               ret);
    }
#endif
#if defined(CONFIG_SPI_MASTER)
    ret = spi_register_driver(&wm8900_spi_driver);
    if (ret != 0) {
        printk(KERN_ERR "Failed to register wm8900 SPI driver: %d\n",
               ret);
    }
#endif
    return ret;
}
module_init(wm8900_modinit);

static void __exit wm8900_exit(void)
{
#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
    i2c_del_driver(&wm8900_i2c_driver);
#endif
#if defined(CONFIG_SPI_MASTER)
    spi_unregister_driver(&wm8900_spi_driver);
#endif
}
module_exit(wm8900_exit);

MODULE_DESCRIPTION("ASoC WM8900 driver");
MODULE_AUTHOR("Mark Brown <[email protected]>");
MODULE_LICENSE("GPL");