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wm8900.c

/*
 * wm8900.c  --  WM8900 ALSA Soc Audio driver
 *
 * Copyright 2007, 2008 Wolfson Microelectronics PLC.
 *
 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * 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/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 <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_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 0xfc00

struct snd_soc_codec_device soc_codec_dev_wm8900;

struct wm8900_priv {
      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 u16 wm8900_reg_defaults[WM8900_MAXREG] = {
      0x8900, 0x0000,
      0xc000, 0x0000,
      0x4050, 0x4000,
      0x0008, 0x0000,
      0x0040, 0x0040,
      0x1004, 0x00c0,
      0x00c0, 0x0000,
      0x0100, 0x00c0,
      0x00c0, 0x0000,
      0xb001, 0x0000,
      0x0000, 0x0044,
      0x004c, 0x004c,
      0x0044, 0x0044,
      0x0000, 0x0044,
      0x0000, 0x0000,
      0x0002, 0x0000,
      0x0000, 0x0000,
      0x0000, 0x0000,
      0x0008, 0x0000,
      0x0000, 0x0008,
      0x0097, 0x0100,
      0x0000, 0x0000,
      0x0050, 0x0050,
      0x0055, 0x0055,
      0x0055, 0x0000,
      0x0000, 0x0079,
      0x0079, 0x0079,
      0x0079, 0x0000,
      /* Remaining registers all zero */
};

/*
 * read wm8900 register cache
 */
static inline unsigned int wm8900_read_reg_cache(struct snd_soc_codec *codec,
      unsigned int reg)
{
      u16 *cache = codec->reg_cache;

      BUG_ON(reg >= WM8900_MAXREG);

      if (reg == WM8900_REG_ID)
            return 0;

      return cache[reg];
}

/*
 * write wm8900 register cache
 */
static inline void wm8900_write_reg_cache(struct snd_soc_codec *codec,
      u16 reg, unsigned int value)
{
      u16 *cache = codec->reg_cache;

      BUG_ON(reg >= WM8900_MAXREG);

      cache[reg] = value;
}

/*
 * write to the WM8900 register space
 */
static int wm8900_write(struct snd_soc_codec *codec, unsigned int reg,
                  unsigned int value)
{
      u8 data[3];

      if (value == wm8900_read_reg_cache(codec, reg))
            return 0;

      /* data is
       *   D15..D9 WM8900 register offset
       *   D8...D0 register data
       */
      data[0] = reg;
      data[1] = value >> 8;
      data[2] = value & 0x00ff;

      wm8900_write_reg_cache(codec, reg, value);
      if (codec->hw_write(codec->control_data, data, 3) == 3)
            return 0;
      else
            return -EIO;
}

/*
 * Read from the wm8900.
 */
static unsigned int wm8900_chip_read(struct snd_soc_codec *codec, u8 reg)
{
      struct i2c_msg xfer[2];
      u16 data;
      int ret;
      struct i2c_client *client = codec->control_data;

      BUG_ON(reg != WM8900_REG_ID && reg != WM8900_REG_POWER1);

      /* Write register */
      xfer[0].addr = client->addr;
      xfer[0].flags = 0;
      xfer[0].len = 1;
      xfer[0].buf = &reg;

      /* Read data */
      xfer[1].addr = client->addr;
      xfer[1].flags = I2C_M_RD;
      xfer[1].len = 2;
      xfer[1].buf = (u8 *)&data;

      ret = i2c_transfer(client->adapter, xfer, 2);
      if (ret != 2) {
            printk(KERN_CRIT "i2c_transfer returned %d\n", ret);
            return 0;
      }

      return (data >> 8) | ((data & 0xff) << 8);
}

/*
 * Read from the WM8900 register space.  Most registers can't be read
 * and are therefore supplied from cache.
 */
static unsigned int wm8900_read(struct snd_soc_codec *codec, unsigned int reg)
{
      switch (reg) {
      case WM8900_REG_ID:
            return wm8900_chip_read(codec, reg);
      default:
            return wm8900_read_reg_cache(codec, reg);
      }
}

static void wm8900_reset(struct snd_soc_codec *codec)
{
      wm8900_write(codec, WM8900_REG_RESET, 0);

      memcpy(codec->reg_cache, wm8900_reg_defaults,
             sizeof(codec->reg_cache));
}

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 = wm8900_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;
            wm8900_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;
            wm8900_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;
            wm8900_write(codec, WM8900_REG_HPCTL1, hpctl1);

            /* Remove the shorts */
            hpctl1 &= ~WM8900_REG_HPCTL1_HP_SHORT2;
            wm8900_write(codec, WM8900_REG_HPCTL1, hpctl1);
            hpctl1 &= ~WM8900_REG_HPCTL1_HP_SHORT;
            wm8900_write(codec, WM8900_REG_HPCTL1, hpctl1);
            break;

      case SND_SOC_DAPM_PRE_PMD:
            /* Short the output */
            hpctl1 |= WM8900_REG_HPCTL1_HP_SHORT;
            wm8900_write(codec, WM8900_REG_HPCTL1, hpctl1);

            /* Disable the output stage */
            hpctl1 &= ~WM8900_REG_HPCTL1_HP_OPSTAGE_ENA;
            wm8900_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;
            wm8900_write(codec, WM8900_REG_HPCTL1, hpctl1);
            break;

      case SND_SOC_DAPM_POST_PMD:
            /* Disable everything */
            wm8900_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 Sloping Stopband Filter Switch", WM8900_REG_DACCTRL, 8, 1, 0),
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),

};

/* add non dapm controls */
static int wm8900_add_controls(struct snd_soc_codec *codec)
{
      int err, i;

      for (i = 0; i < ARRAY_SIZE(wm8900_snd_controls); i++) {
            err = snd_ctl_add(codec->card,
                          snd_soc_cnew(&wm8900_snd_controls[i],
                                     codec, NULL));
            if (err < 0)
                  return err;
      }

      return 0;
}

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 *wm9700_lp_mux[] = { "Disabled", "Enabled" };

static const struct soc_enum wm8900_lineout2_lp_mux =
SOC_ENUM_SINGLE(WM8900_REG_LOUTMIXCTL1, 1, 2, wm9700_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_MICBIAS("Mic Bias", WM8900_REG_POWER1, 4, 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 audio_map[] = {
/* 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_add_widgets(struct snd_soc_codec *codec)
{
      snd_soc_dapm_new_controls(codec, wm8900_dapm_widgets,
                          ARRAY_SIZE(wm8900_dapm_widgets));

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

      snd_soc_dapm_new_widgets(codec);

      return 0;
}

static int wm8900_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;
      u16 reg;

      reg = wm8900_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;
      }

      wm8900_write(codec, WM8900_REG_AUDIO1, 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 %d out of range, Fref=%d"
                   " Fout=%d\n", target, Fref, Fout);
      if (div > 32) {
            printk(KERN_ERR "wm8900: Invalid FLL division rate %u, "
                   "Fref=%d, Fout=%d, target=%d\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 = codec->private_data;
      struct _fll_div fll_div;
      unsigned int reg;

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

      /* The digital side should be disabled during any change. */
      reg = wm8900_read(codec, WM8900_REG_POWER1);
      wm8900_write(codec, WM8900_REG_POWER1,
                 reg & (~WM8900_REG_POWER1_FLL_ENA));

      /* Disable the FLL? */
      if (!freq_in || !freq_out) {
            reg = wm8900_read(codec, WM8900_REG_CLOCKING1);
            wm8900_write(codec, WM8900_REG_CLOCKING1,
                       reg & (~WM8900_REG_CLOCKING1_MCLK_SRC));

            reg = wm8900_read(codec, WM8900_REG_FLLCTL1);
            wm8900_write(codec, WM8900_REG_FLLCTL1,
                       reg & (~WM8900_REG_FLLCTL1_OSC_ENA));

            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. */
      wm8900_write(codec, WM8900_REG_FLLCTL1,
                 fll_div.fll_ratio | WM8900_REG_FLLCTL1_OSC_ENA);

      wm8900_write(codec, WM8900_REG_FLLCTL4, fll_div.n >> 5);
      wm8900_write(codec, WM8900_REG_FLLCTL5,
                 (fll_div.fllclk_div << 6) | (fll_div.n & 0x1f));

      if (fll_div.k) {
            wm8900_write(codec, WM8900_REG_FLLCTL2,
                       (fll_div.k >> 8) | 0x100);
            wm8900_write(codec, WM8900_REG_FLLCTL3, fll_div.k & 0xff);
      } else
            wm8900_write(codec, WM8900_REG_FLLCTL2, 0);

      if (fll_div.fll_slow_lock_ref)
            wm8900_write(codec, WM8900_REG_FLLCTL6,
                       WM8900_REG_FLLCTL6_FLL_SLOW_LOCK_REF);
      else
            wm8900_write(codec, WM8900_REG_FLLCTL6, 0);

      reg = wm8900_read(codec, WM8900_REG_POWER1);
      wm8900_write(codec, WM8900_REG_POWER1,
                 reg | WM8900_REG_POWER1_FLL_ENA);

reenable:
      reg = wm8900_read(codec, WM8900_REG_CLOCKING1);
      wm8900_write(codec, WM8900_REG_CLOCKING1,
                 reg | WM8900_REG_CLOCKING1_MCLK_SRC);

      return 0;
}

static int wm8900_set_dai_pll(struct snd_soc_dai *codec_dai,
            int pll_id, 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;
      unsigned int reg;

      switch (div_id) {
      case WM8900_BCLK_DIV:
            reg = wm8900_read(codec, WM8900_REG_CLOCKING1);
            wm8900_write(codec, WM8900_REG_CLOCKING1,
                       div | (reg & WM8900_REG_CLOCKING1_BCLK_MASK));
            break;
      case WM8900_OPCLK_DIV:
            reg = wm8900_read(codec, WM8900_REG_CLOCKING1);
            wm8900_write(codec, WM8900_REG_CLOCKING1,
                       div | (reg & WM8900_REG_CLOCKING1_OPCLK_MASK));
            break;
      case WM8900_DAC_LRCLK:
            reg = wm8900_read(codec, WM8900_REG_AUDIO4);
            wm8900_write(codec, WM8900_REG_AUDIO4,
                       div | (reg & WM8900_LRC_MASK));
            break;
      case WM8900_ADC_LRCLK:
            reg = wm8900_read(codec, WM8900_REG_AUDIO3);
            wm8900_write(codec, WM8900_REG_AUDIO3,
                       div | (reg & WM8900_LRC_MASK));
            break;
      case WM8900_DAC_CLKDIV:
            reg = wm8900_read(codec, WM8900_REG_CLOCKING2);
            wm8900_write(codec, WM8900_REG_CLOCKING2,
                       div | (reg & WM8900_REG_CLOCKING2_DAC_CLKDIV));
            break;
      case WM8900_ADC_CLKDIV:
            reg = wm8900_read(codec, WM8900_REG_CLOCKING2);
            wm8900_write(codec, WM8900_REG_CLOCKING2,
                       div | (reg & WM8900_REG_CLOCKING2_ADC_CLKDIV));
            break;
      case WM8900_LRCLK_MODE:
            reg = wm8900_read(codec, WM8900_REG_DACCTRL);
            wm8900_write(codec, WM8900_REG_DACCTRL,
                       div | (reg & WM8900_REG_DACCTRL_AIF_LRCLKRATE));
            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 = wm8900_read(codec, WM8900_REG_CLOCKING1);
      aif1 = wm8900_read(codec, WM8900_REG_AUDIO1);
      aif3 = wm8900_read(codec, WM8900_REG_AUDIO3);
      aif4 = wm8900_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;
      }

      wm8900_write(codec, WM8900_REG_CLOCKING1, clocking1);
      wm8900_write(codec, WM8900_REG_AUDIO1, aif1);
      wm8900_write(codec, WM8900_REG_AUDIO3, aif3);
      wm8900_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 = wm8900_read(codec, WM8900_REG_DACCTRL);

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

      wm8900_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)

struct snd_soc_dai 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 = {
            .hw_params = wm8900_hw_params,
       },
      .dai_ops = {
             .set_clkdiv = wm8900_set_dai_clkdiv,
             .set_pll = wm8900_set_dai_pll,
             .set_fmt = wm8900_set_dai_fmt,
             .digital_mute = wm8900_digital_mute,
       },
};
EXPORT_SYMBOL_GPL(wm8900_dai);

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 */
            reg = wm8900_read(codec, WM8900_REG_GPIO);
            wm8900_write(codec, WM8900_REG_GPIO,
                       reg | WM8900_REG_GPIO_TEMP_ENA);
            reg = wm8900_read(codec, WM8900_REG_ADDCTL);
            wm8900_write(codec, WM8900_REG_ADDCTL,
                       reg | 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->bias_level == SND_SOC_BIAS_OFF) {
                  /* STARTUP_BIAS_ENA on */
                  wm8900_write(codec, WM8900_REG_POWER1,
                             WM8900_REG_POWER1_STARTUP_BIAS_ENA);

                  /* Startup bias mode */
                  wm8900_write(codec, WM8900_REG_ADDCTL,
                             WM8900_REG_ADDCTL_BIAS_SRC |
                             WM8900_REG_ADDCTL_VMID_SOFTST);

                  /* VMID 2x50k */
                  wm8900_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 */
                  wm8900_write(codec, WM8900_REG_POWER1,
                             WM8900_REG_POWER1_STARTUP_BIAS_ENA |
                             WM8900_REG_POWER1_BIAS_ENA | 0x1);

                  wm8900_write(codec, WM8900_REG_ADDCTL, 0);

                  wm8900_write(codec, WM8900_REG_POWER1,
                             WM8900_REG_POWER1_BIAS_ENA | 0x1);
            }

            reg = wm8900_read(codec, WM8900_REG_POWER1);
            wm8900_write(codec, WM8900_REG_POWER1,
                       (reg & WM8900_REG_POWER1_FLL_ENA) |
                       WM8900_REG_POWER1_BIAS_ENA | 0x1);
            wm8900_write(codec, WM8900_REG_POWER2,
                       WM8900_REG_POWER2_SYSCLK_ENA);
            wm8900_write(codec, WM8900_REG_POWER3, 0);
            break;

      case SND_SOC_BIAS_OFF:
            /* Startup bias enable */
            reg = wm8900_read(codec, WM8900_REG_POWER1);
            wm8900_write(codec, WM8900_REG_POWER1,
                       reg & WM8900_REG_POWER1_STARTUP_BIAS_ENA);
            wm8900_write(codec, WM8900_REG_ADDCTL,
                       WM8900_REG_ADDCTL_BIAS_SRC |
                       WM8900_REG_ADDCTL_VMID_SOFTST);

            /* Discharge caps */
            wm8900_write(codec, WM8900_REG_POWER1,
                       WM8900_REG_POWER1_STARTUP_BIAS_ENA);
            schedule_timeout_interruptible(msecs_to_jiffies(500));

            /* Remove clamp */
            wm8900_write(codec, WM8900_REG_HPCTL1, 0);

            /* Power down */
            wm8900_write(codec, WM8900_REG_ADDCTL, 0);
            wm8900_write(codec, WM8900_REG_POWER1, 0);
            wm8900_write(codec, WM8900_REG_POWER2, 0);
            wm8900_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));
            wm8900_write(codec, WM8900_REG_POWER2,
                       WM8900_REG_POWER2_SYSCLK_ENA);
            break;
      }
      codec->bias_level = level;
      return 0;
}

static int wm8900_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;
      struct wm8900_priv *wm8900 = codec->private_data;
      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(&pdev->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 platform_device *pdev)
{
      struct snd_soc_device *socdev = platform_get_drvdata(pdev);
      struct snd_soc_codec *codec = socdev->codec;
      struct wm8900_priv *wm8900 = codec->private_data;
      u16 *cache;
      int i, ret;

      cache = kmemdup(codec->reg_cache, sizeof(wm8900_reg_defaults),
                  GFP_KERNEL);

      wm8900_reset(codec);
      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(&pdev->dev, "Failed to restart FLL\n");
                  return ret;
            }
      }

      if (cache) {
            for (i = 0; i < WM8900_MAXREG; i++)
                  wm8900_write(codec, i, cache[i]);
            kfree(cache);
      } else
            dev_err(&pdev->dev, "Unable to allocate register cache\n");

      return 0;
}

/*
 * initialise the WM8900 driver
 * register the mixer and dsp interfaces with the kernel
 */
static int wm8900_init(struct snd_soc_device *socdev)
{
      struct snd_soc_codec *codec = socdev->codec;
      int ret = 0;
      unsigned int reg;
      struct i2c_client *i2c_client = socdev->codec->control_data;

      codec->name = "WM8900";
      codec->owner = THIS_MODULE;
      codec->read = wm8900_read;
      codec->write = wm8900_write;
      codec->dai = &wm8900_dai;
      codec->num_dai = 1;
      codec->reg_cache_size = WM8900_MAXREG;
      codec->reg_cache = kmemdup(wm8900_reg_defaults,
                           sizeof(wm8900_reg_defaults), GFP_KERNEL);

      if (codec->reg_cache == NULL)
            return -ENOMEM;

      reg = wm8900_read(codec, WM8900_REG_ID);
      if (reg != 0x8900) {
            dev_err(&i2c_client->dev, "Device is not a WM8900 - ID %x\n",
                  reg);
            return -ENODEV;
      }

      codec->private_data = kzalloc(sizeof(struct wm8900_priv), GFP_KERNEL);
      if (codec->private_data == NULL) {
            ret = -ENOMEM;
            goto priv_err;
      }

      /* Read back from the chip */
      reg = wm8900_chip_read(codec, WM8900_REG_POWER1);
      reg = (reg >> 12) & 0xf;
      dev_info(&i2c_client->dev, "WM8900 revision %d\n", reg);

      wm8900_reset(codec);

      /* Latch the volume update bits */
      wm8900_write(codec, WM8900_REG_LINVOL,
                 wm8900_read(codec, WM8900_REG_LINVOL) | 0x100);
      wm8900_write(codec, WM8900_REG_RINVOL,
                 wm8900_read(codec, WM8900_REG_RINVOL) | 0x100);
      wm8900_write(codec, WM8900_REG_LOUT1CTL,
                 wm8900_read(codec, WM8900_REG_LOUT1CTL) | 0x100);
      wm8900_write(codec, WM8900_REG_ROUT1CTL,
                 wm8900_read(codec, WM8900_REG_ROUT1CTL) | 0x100);
      wm8900_write(codec, WM8900_REG_LOUT2CTL,
                 wm8900_read(codec, WM8900_REG_LOUT2CTL) | 0x100);
      wm8900_write(codec, WM8900_REG_ROUT2CTL,
                 wm8900_read(codec, WM8900_REG_ROUT2CTL) | 0x100);
      wm8900_write(codec, WM8900_REG_LDAC_DV,
                 wm8900_read(codec, WM8900_REG_LDAC_DV) | 0x100);
      wm8900_write(codec, WM8900_REG_RDAC_DV,
                 wm8900_read(codec, WM8900_REG_RDAC_DV) | 0x100);
      wm8900_write(codec, WM8900_REG_LADC_DV,
                 wm8900_read(codec, WM8900_REG_LADC_DV) | 0x100);
      wm8900_write(codec, WM8900_REG_RADC_DV,
                 wm8900_read(codec, WM8900_REG_RADC_DV) | 0x100);

      /* Set the DAC and mixer output bias */
      wm8900_write(codec, WM8900_REG_OUTBIASCTL, 0x81);

      /* Register pcms */
      ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
      if (ret < 0) {
            dev_err(&i2c_client->dev, "Failed to register new PCMs\n");
            goto pcm_err;
      }

      /* Turn the chip on */
      codec->bias_level = SND_SOC_BIAS_OFF;
      wm8900_set_bias_level(codec, SND_SOC_BIAS_STANDBY);

      wm8900_add_controls(codec);
      wm8900_add_widgets(codec);

      ret = snd_soc_register_card(socdev);
      if (ret < 0) {
            dev_err(&i2c_client->dev, "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);
priv_err:
      kfree(codec->private_data);
      return ret;
}

static struct snd_soc_device *wm8900_socdev;

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

/* If the i2c layer weren't so broken, we could pass this kind of data
   around */
static int wm8900_i2c_probe(struct i2c_client *i2c,
                      const struct i2c_device_id *id)
{
      struct snd_soc_device *socdev = wm8900_socdev;
      struct snd_soc_codec *codec = socdev->codec;
      int ret;

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

      ret = wm8900_init(socdev);
      if (ret < 0)
            dev_err(&i2c->dev, "failed to initialise WM8900\n");
      return ret;
}

static int wm8900_i2c_remove(struct i2c_client *client)
{
      struct snd_soc_codec *codec = i2c_get_clientdata(client);
      kfree(codec->reg_cache);
      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 I2C codec",
            .owner = THIS_MODULE,
      },
      .probe = wm8900_i2c_probe,
      .remove = wm8900_i2c_remove,
      .id_table = wm8900_i2c_id,
};

static int wm8900_add_i2c_device(struct platform_device *pdev,
                         const struct wm8900_setup_data *setup)
{
      struct i2c_board_info info;
      struct i2c_adapter *adapter;
      struct i2c_client *client;
      int ret;

      ret = i2c_add_driver(&wm8900_i2c_driver);
      if (ret != 0) {
            dev_err(&pdev->dev, "can't add i2c driver\n");
            return ret;
      }

      memset(&info, 0, sizeof(struct i2c_board_info));
      info.addr = setup->i2c_address;
      strlcpy(info.type, "wm8900", I2C_NAME_SIZE);

      adapter = i2c_get_adapter(setup->i2c_bus);
      if (!adapter) {
            dev_err(&pdev->dev, "can't get i2c adapter %d\n",
                  setup->i2c_bus);
            goto err_driver;
      }

      client = i2c_new_device(adapter, &info);
      i2c_put_adapter(adapter);
      if (!client) {
            dev_err(&pdev->dev, "can't add i2c device at 0x%x\n",
                  (unsigned int)info.addr);
            goto err_driver;
      }

      return 0;

err_driver:
      i2c_del_driver(&wm8900_i2c_driver);
      return -ENODEV;
}
#endif

static int wm8900_probe(struct platform_device *pdev)
{
      struct snd_soc_device *socdev = platform_get_drvdata(pdev);
      struct wm8900_setup_data *setup;
      struct snd_soc_codec *codec;
      int ret = 0;

      dev_info(&pdev->dev, "WM8900 Audio Codec\n");

      setup = socdev->codec_data;
      codec = kzalloc(sizeof(struct snd_soc_codec), GFP_KERNEL);
      if (codec == NULL)
            return -ENOMEM;

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

      socdev->codec = codec;

      codec->set_bias_level = wm8900_set_bias_level;

      wm8900_socdev = socdev;
#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
      if (setup->i2c_address) {
            codec->hw_write = (hw_write_t)i2c_master_send;
            ret = wm8900_add_i2c_device(pdev, setup);
      }
#else
#error Non-I2C interfaces not yet supported
#endif
      return ret;
}

/* power down chip */
static int wm8900_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)
            wm8900_set_bias_level(codec, SND_SOC_BIAS_OFF);

      snd_soc_free_pcms(socdev);
      snd_soc_dapm_free(socdev);
#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
      i2c_unregister_device(codec->control_data);
      i2c_del_driver(&wm8900_i2c_driver);
#endif
      kfree(codec);

      return 0;
}

struct snd_soc_codec_device soc_codec_dev_wm8900 = {
      .probe =    wm8900_probe,
      .remove =   wm8900_remove,
      .suspend =  wm8900_suspend,
      .resume =   wm8900_resume,
};
EXPORT_SYMBOL_GPL(soc_codec_dev_wm8900);

MODULE_DESCRIPTION("ASoC WM8900 driver");
MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfonmicro.com>");
MODULE_LICENSE("GPL");

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