/*
   * wm8988.c -- WM8988 ALSA SoC audio driver
   *
   * Copyright 2009 Wolfson Microelectronics plc
   * Copyright 2005 Openedhand Ltd.
   *
   * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License version 2 as
   * published by the Free Software Foundation.
   */
  
  #include <linux/module.h>
  #include <linux/moduleparam.h>
  #include <linux/init.h>
  #include <linux/delay.h>
  #include <linux/pm.h>
  #include <linux/i2c.h>
  #include <linux/spi/spi.h>

  #include <linux/slab.h>

  #include <sound/core.h>
  #include <sound/pcm.h>
  #include <sound/pcm_params.h>
  #include <sound/tlv.h>
  #include <sound/soc.h>

  #include <sound/initval.h>
  
  #include "wm8988.h"
  
  /*
   * wm8988 register cache
   * We can't read the WM8988 register space when we
   * are using 2 wire for device control, so we cache them instead.
   */

  static const struct reg_default wm8988_reg_defaults[] = {
  	{ 0, 0x0097 },
  	{ 1, 0x0097 },
  	{ 2, 0x0079 },
  	{ 3, 0x0079 },
  	{ 5, 0x0008 },
  	{ 7, 0x000a },
  	{ 8, 0x0000 },
  	{ 10, 0x00ff },
  	{ 11, 0x00ff },
  	{ 12, 0x000f },
  	{ 13, 0x000f },
  	{ 16, 0x0000 },
  	{ 17, 0x007b },
  	{ 18, 0x0000 },
  	{ 19, 0x0032 },
  	{ 20, 0x0000 },
  	{ 21, 0x00c3 },
  	{ 22, 0x00c3 },
  	{ 23, 0x00c0 },
  	{ 24, 0x0000 },
  	{ 25, 0x0000 },
  	{ 26, 0x0000 },
  	{ 27, 0x0000 },
  	{ 31, 0x0000 },
  	{ 32, 0x0000 },
  	{ 33, 0x0000 },
  	{ 34, 0x0050 },
  	{ 35, 0x0050 },
  	{ 36, 0x0050 },
  	{ 37, 0x0050 },
  	{ 40, 0x0079 },
  	{ 41, 0x0079 },
  	{ 42, 0x0079 },

  };

  static bool wm8988_writeable(struct device *dev, unsigned int reg)
  {
  	switch (reg) {
  	case WM8988_LINVOL:
  	case WM8988_RINVOL:
  	case WM8988_LOUT1V:
  	case WM8988_ROUT1V:
  	case WM8988_ADCDAC:
  	case WM8988_IFACE:
  	case WM8988_SRATE:
  	case WM8988_LDAC:
  	case WM8988_RDAC:
  	case WM8988_BASS:
  	case WM8988_TREBLE:
  	case WM8988_RESET:
  	case WM8988_3D:
  	case WM8988_ALC1:
  	case WM8988_ALC2:
  	case WM8988_ALC3:
  	case WM8988_NGATE:
  	case WM8988_LADC:
  	case WM8988_RADC:
  	case WM8988_ADCTL1:
  	case WM8988_ADCTL2:
  	case WM8988_PWR1:
  	case WM8988_PWR2:
  	case WM8988_ADCTL3:
  	case WM8988_ADCIN:
  	case WM8988_LADCIN:
  	case WM8988_RADCIN:
  	case WM8988_LOUTM1:
  	case WM8988_LOUTM2:
  	case WM8988_ROUTM1:
  	case WM8988_ROUTM2:
  	case WM8988_LOUT2V:
  	case WM8988_ROUT2V:
  	case WM8988_LPPB:
  		return true;
  	default:
  		return false;
  	}
  }

  /* codec private data */
  struct wm8988_priv {

  	struct regmap *regmap;

  	unsigned int sysclk;

  	struct snd_pcm_hw_constraint_list *sysclk_constraints;

  };

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

  
  /*
   * WM8988 Controls
   */
  
  static const char *bass_boost_txt[] = {"Linear Control", "Adaptive Boost"};
  static const struct soc_enum bass_boost =
  	SOC_ENUM_SINGLE(WM8988_BASS, 7, 2, bass_boost_txt);
  
  static const char *bass_filter_txt[] = { "130Hz @ 48kHz", "200Hz @ 48kHz" };
  static const struct soc_enum bass_filter =
  	SOC_ENUM_SINGLE(WM8988_BASS, 6, 2, bass_filter_txt);
  
  static const char *treble_txt[] = {"8kHz", "4kHz"};
  static const struct soc_enum treble =
  	SOC_ENUM_SINGLE(WM8988_TREBLE, 6, 2, treble_txt);
  
  static const char *stereo_3d_lc_txt[] = {"200Hz", "500Hz"};
  static const struct soc_enum stereo_3d_lc =
  	SOC_ENUM_SINGLE(WM8988_3D, 5, 2, stereo_3d_lc_txt);
  
  static const char *stereo_3d_uc_txt[] = {"2.2kHz", "1.5kHz"};
  static const struct soc_enum stereo_3d_uc =
  	SOC_ENUM_SINGLE(WM8988_3D, 6, 2, stereo_3d_uc_txt);
  
  static const char *stereo_3d_func_txt[] = {"Capture", "Playback"};
  static const struct soc_enum stereo_3d_func =
  	SOC_ENUM_SINGLE(WM8988_3D, 7, 2, stereo_3d_func_txt);
  
  static const char *alc_func_txt[] = {"Off", "Right", "Left", "Stereo"};
  static const struct soc_enum alc_func =
  	SOC_ENUM_SINGLE(WM8988_ALC1, 7, 4, alc_func_txt);
  
  static const char *ng_type_txt[] = {"Constant PGA Gain",
  				    "Mute ADC Output"};
  static const struct soc_enum ng_type =
  	SOC_ENUM_SINGLE(WM8988_NGATE, 1, 2, ng_type_txt);
  
  static const char *deemph_txt[] = {"None", "32Khz", "44.1Khz", "48Khz"};
  static const struct soc_enum deemph =
  	SOC_ENUM_SINGLE(WM8988_ADCDAC, 1, 4, deemph_txt);
  
  static const char *adcpol_txt[] = {"Normal", "L Invert", "R Invert",
  				   "L + R Invert"};
  static const struct soc_enum adcpol =
  	SOC_ENUM_SINGLE(WM8988_ADCDAC, 5, 4, adcpol_txt);
  
  static const DECLARE_TLV_DB_SCALE(pga_tlv, -1725, 75, 0);
  static const DECLARE_TLV_DB_SCALE(adc_tlv, -9750, 50, 1);
  static const DECLARE_TLV_DB_SCALE(dac_tlv, -12750, 50, 1);
  static const DECLARE_TLV_DB_SCALE(out_tlv, -12100, 100, 1);
  static const DECLARE_TLV_DB_SCALE(bypass_tlv, -1500, 300, 0);
  
  static const struct snd_kcontrol_new wm8988_snd_controls[] = {
  
  SOC_ENUM("Bass Boost", bass_boost),
  SOC_ENUM("Bass Filter", bass_filter),
  SOC_SINGLE("Bass Volume", WM8988_BASS, 0, 15, 1),
  
  SOC_SINGLE("Treble Volume", WM8988_TREBLE, 0, 15, 0),
  SOC_ENUM("Treble Cut-off", treble),
  
  SOC_SINGLE("3D Switch", WM8988_3D, 0, 1, 0),
  SOC_SINGLE("3D Volume", WM8988_3D, 1, 15, 0),
  SOC_ENUM("3D Lower Cut-off", stereo_3d_lc),
  SOC_ENUM("3D Upper Cut-off", stereo_3d_uc),
  SOC_ENUM("3D Mode", stereo_3d_func),
  
  SOC_SINGLE("ALC Capture Target Volume", WM8988_ALC1, 0, 7, 0),
  SOC_SINGLE("ALC Capture Max Volume", WM8988_ALC1, 4, 7, 0),
  SOC_ENUM("ALC Capture Function", alc_func),
  SOC_SINGLE("ALC Capture ZC Switch", WM8988_ALC2, 7, 1, 0),
  SOC_SINGLE("ALC Capture Hold Time", WM8988_ALC2, 0, 15, 0),
  SOC_SINGLE("ALC Capture Decay Time", WM8988_ALC3, 4, 15, 0),
  SOC_SINGLE("ALC Capture Attack Time", WM8988_ALC3, 0, 15, 0),
  SOC_SINGLE("ALC Capture NG Threshold", WM8988_NGATE, 3, 31, 0),
  SOC_ENUM("ALC Capture NG Type", ng_type),
  SOC_SINGLE("ALC Capture NG Switch", WM8988_NGATE, 0, 1, 0),
  
  SOC_SINGLE("ZC Timeout Switch", WM8988_ADCTL1, 0, 1, 0),
  
  SOC_DOUBLE_R_TLV("Capture Digital Volume", WM8988_LADC, WM8988_RADC,
  		 0, 255, 0, adc_tlv),
  SOC_DOUBLE_R_TLV("Capture Volume", WM8988_LINVOL, WM8988_RINVOL,
  		 0, 63, 0, pga_tlv),
  SOC_DOUBLE_R("Capture ZC Switch", WM8988_LINVOL, WM8988_RINVOL, 6, 1, 0),
  SOC_DOUBLE_R("Capture Switch", WM8988_LINVOL, WM8988_RINVOL, 7, 1, 1),
  
  SOC_ENUM("Playback De-emphasis", deemph),
  
  SOC_ENUM("Capture Polarity", adcpol),
  SOC_SINGLE("Playback 6dB Attenuate", WM8988_ADCDAC, 7, 1, 0),
  SOC_SINGLE("Capture 6dB Attenuate", WM8988_ADCDAC, 8, 1, 0),
  
  SOC_DOUBLE_R_TLV("PCM Volume", WM8988_LDAC, WM8988_RDAC, 0, 255, 0, dac_tlv),
  
  SOC_SINGLE_TLV("Left Mixer Left Bypass Volume", WM8988_LOUTM1, 4, 7, 1,
  	       bypass_tlv),
  SOC_SINGLE_TLV("Left Mixer Right Bypass Volume", WM8988_LOUTM2, 4, 7, 1,
  	       bypass_tlv),
  SOC_SINGLE_TLV("Right Mixer Left Bypass Volume", WM8988_ROUTM1, 4, 7, 1,
  	       bypass_tlv),
  SOC_SINGLE_TLV("Right Mixer Right Bypass Volume", WM8988_ROUTM2, 4, 7, 1,
  	       bypass_tlv),
  
  SOC_DOUBLE_R("Output 1 Playback ZC Switch", WM8988_LOUT1V,
  	     WM8988_ROUT1V, 7, 1, 0),
  SOC_DOUBLE_R_TLV("Output 1 Playback Volume", WM8988_LOUT1V, WM8988_ROUT1V,
  		 0, 127, 0, out_tlv),
  
  SOC_DOUBLE_R("Output 2 Playback ZC Switch", WM8988_LOUT2V,
  	     WM8988_ROUT2V, 7, 1, 0),
  SOC_DOUBLE_R_TLV("Output 2 Playback Volume", WM8988_LOUT2V, WM8988_ROUT2V,
  		 0, 127, 0, out_tlv),
  
  };
  
  /*
   * DAPM Controls
   */
  
  static int wm8988_lrc_control(struct snd_soc_dapm_widget *w,
  			      struct snd_kcontrol *kcontrol, int event)
  {
  	struct snd_soc_codec *codec = w->codec;

  	u16 adctl2 = snd_soc_read(codec, WM8988_ADCTL2);

  
  	/* Use the DAC to gate LRC if active, otherwise use ADC */

  	if (snd_soc_read(codec, WM8988_PWR2) & 0x180)

  		adctl2 &= ~0x4;
  	else
  		adctl2 |= 0x4;

  	return snd_soc_write(codec, WM8988_ADCTL2, adctl2);

  }
  
  static const char *wm8988_line_texts[] = {
  	"Line 1", "Line 2", "PGA", "Differential"};
  
  static const unsigned int wm8988_line_values[] = {
  	0, 1, 3, 4};
  
  static const struct soc_enum wm8988_lline_enum =
  	SOC_VALUE_ENUM_SINGLE(WM8988_LOUTM1, 0, 7,
  			      ARRAY_SIZE(wm8988_line_texts),
  			      wm8988_line_texts,
  			      wm8988_line_values);
  static const struct snd_kcontrol_new wm8988_left_line_controls =
  	SOC_DAPM_VALUE_ENUM("Route", wm8988_lline_enum);
  
  static const struct soc_enum wm8988_rline_enum =
  	SOC_VALUE_ENUM_SINGLE(WM8988_ROUTM1, 0, 7,
  			      ARRAY_SIZE(wm8988_line_texts),
  			      wm8988_line_texts,
  			      wm8988_line_values);
  static const struct snd_kcontrol_new wm8988_right_line_controls =
  	SOC_DAPM_VALUE_ENUM("Route", wm8988_lline_enum);
  
  /* Left Mixer */
  static const struct snd_kcontrol_new wm8988_left_mixer_controls[] = {
  	SOC_DAPM_SINGLE("Playback Switch", WM8988_LOUTM1, 8, 1, 0),
  	SOC_DAPM_SINGLE("Left Bypass Switch", WM8988_LOUTM1, 7, 1, 0),
  	SOC_DAPM_SINGLE("Right Playback Switch", WM8988_LOUTM2, 8, 1, 0),
  	SOC_DAPM_SINGLE("Right Bypass Switch", WM8988_LOUTM2, 7, 1, 0),
  };
  
  /* Right Mixer */
  static const struct snd_kcontrol_new wm8988_right_mixer_controls[] = {
  	SOC_DAPM_SINGLE("Left Playback Switch", WM8988_ROUTM1, 8, 1, 0),
  	SOC_DAPM_SINGLE("Left Bypass Switch", WM8988_ROUTM1, 7, 1, 0),
  	SOC_DAPM_SINGLE("Playback Switch", WM8988_ROUTM2, 8, 1, 0),
  	SOC_DAPM_SINGLE("Right Bypass Switch", WM8988_ROUTM2, 7, 1, 0),
  };
  
  static const char *wm8988_pga_sel[] = {"Line 1", "Line 2", "Differential"};
  static const unsigned int wm8988_pga_val[] = { 0, 1, 3 };
  
  /* Left PGA Mux */
  static const struct soc_enum wm8988_lpga_enum =
  	SOC_VALUE_ENUM_SINGLE(WM8988_LADCIN, 6, 3,
  			      ARRAY_SIZE(wm8988_pga_sel),
  			      wm8988_pga_sel,
  			      wm8988_pga_val);
  static const struct snd_kcontrol_new wm8988_left_pga_controls =
  	SOC_DAPM_VALUE_ENUM("Route", wm8988_lpga_enum);
  
  /* Right PGA Mux */
  static const struct soc_enum wm8988_rpga_enum =
  	SOC_VALUE_ENUM_SINGLE(WM8988_RADCIN, 6, 3,
  			      ARRAY_SIZE(wm8988_pga_sel),
  			      wm8988_pga_sel,
  			      wm8988_pga_val);
  static const struct snd_kcontrol_new wm8988_right_pga_controls =
  	SOC_DAPM_VALUE_ENUM("Route", wm8988_rpga_enum);
  
  /* Differential Mux */
  static const char *wm8988_diff_sel[] = {"Line 1", "Line 2"};
  static const struct soc_enum diffmux =
  	SOC_ENUM_SINGLE(WM8988_ADCIN, 8, 2, wm8988_diff_sel);
  static const struct snd_kcontrol_new wm8988_diffmux_controls =
  	SOC_DAPM_ENUM("Route", diffmux);
  
  /* Mono ADC Mux */
  static const char *wm8988_mono_mux[] = {"Stereo", "Mono (Left)",
  	"Mono (Right)", "Digital Mono"};
  static const struct soc_enum monomux =
  	SOC_ENUM_SINGLE(WM8988_ADCIN, 6, 4, wm8988_mono_mux);
  static const struct snd_kcontrol_new wm8988_monomux_controls =
  	SOC_DAPM_ENUM("Route", monomux);
  
  static const struct snd_soc_dapm_widget wm8988_dapm_widgets[] = {

  	SND_SOC_DAPM_SUPPLY("Mic Bias", WM8988_PWR1, 1, 0, NULL, 0),

  
  	SND_SOC_DAPM_MUX("Differential Mux", SND_SOC_NOPM, 0, 0,
  		&wm8988_diffmux_controls),
  	SND_SOC_DAPM_MUX("Left ADC Mux", SND_SOC_NOPM, 0, 0,
  		&wm8988_monomux_controls),
  	SND_SOC_DAPM_MUX("Right ADC Mux", SND_SOC_NOPM, 0, 0,
  		&wm8988_monomux_controls),
  
  	SND_SOC_DAPM_MUX("Left PGA Mux", WM8988_PWR1, 5, 0,
  		&wm8988_left_pga_controls),
  	SND_SOC_DAPM_MUX("Right PGA Mux", WM8988_PWR1, 4, 0,
  		&wm8988_right_pga_controls),
  
  	SND_SOC_DAPM_MUX("Left Line Mux", SND_SOC_NOPM, 0, 0,
  		&wm8988_left_line_controls),
  	SND_SOC_DAPM_MUX("Right Line Mux", SND_SOC_NOPM, 0, 0,
  		&wm8988_right_line_controls),
  
  	SND_SOC_DAPM_ADC("Right ADC", "Right Capture", WM8988_PWR1, 2, 0),
  	SND_SOC_DAPM_ADC("Left ADC", "Left Capture", WM8988_PWR1, 3, 0),
  
  	SND_SOC_DAPM_DAC("Right DAC", "Right Playback", WM8988_PWR2, 7, 0),
  	SND_SOC_DAPM_DAC("Left DAC", "Left Playback", WM8988_PWR2, 8, 0),
  
  	SND_SOC_DAPM_MIXER("Left Mixer", SND_SOC_NOPM, 0, 0,
  		&wm8988_left_mixer_controls[0],
  		ARRAY_SIZE(wm8988_left_mixer_controls)),
  	SND_SOC_DAPM_MIXER("Right Mixer", SND_SOC_NOPM, 0, 0,
  		&wm8988_right_mixer_controls[0],
  		ARRAY_SIZE(wm8988_right_mixer_controls)),
  
  	SND_SOC_DAPM_PGA("Right Out 2", WM8988_PWR2, 3, 0, NULL, 0),
  	SND_SOC_DAPM_PGA("Left Out 2", WM8988_PWR2, 4, 0, NULL, 0),
  	SND_SOC_DAPM_PGA("Right Out 1", WM8988_PWR2, 5, 0, NULL, 0),
  	SND_SOC_DAPM_PGA("Left Out 1", WM8988_PWR2, 6, 0, NULL, 0),
  
  	SND_SOC_DAPM_POST("LRC control", wm8988_lrc_control),
  
  	SND_SOC_DAPM_OUTPUT("LOUT1"),
  	SND_SOC_DAPM_OUTPUT("ROUT1"),
  	SND_SOC_DAPM_OUTPUT("LOUT2"),
  	SND_SOC_DAPM_OUTPUT("ROUT2"),
  	SND_SOC_DAPM_OUTPUT("VREF"),
  
  	SND_SOC_DAPM_INPUT("LINPUT1"),
  	SND_SOC_DAPM_INPUT("LINPUT2"),
  	SND_SOC_DAPM_INPUT("RINPUT1"),
  	SND_SOC_DAPM_INPUT("RINPUT2"),
  };

  static const struct snd_soc_dapm_route wm8988_dapm_routes[] = {

  
  	{ "Left Line Mux", "Line 1", "LINPUT1" },
  	{ "Left Line Mux", "Line 2", "LINPUT2" },
  	{ "Left Line Mux", "PGA", "Left PGA Mux" },
  	{ "Left Line Mux", "Differential", "Differential Mux" },
  
  	{ "Right Line Mux", "Line 1", "RINPUT1" },
  	{ "Right Line Mux", "Line 2", "RINPUT2" },
  	{ "Right Line Mux", "PGA", "Right PGA Mux" },
  	{ "Right Line Mux", "Differential", "Differential Mux" },
  
  	{ "Left PGA Mux", "Line 1", "LINPUT1" },
  	{ "Left PGA Mux", "Line 2", "LINPUT2" },
  	{ "Left PGA Mux", "Differential", "Differential Mux" },
  
  	{ "Right PGA Mux", "Line 1", "RINPUT1" },
  	{ "Right PGA Mux", "Line 2", "RINPUT2" },
  	{ "Right PGA Mux", "Differential", "Differential Mux" },
  
  	{ "Differential Mux", "Line 1", "LINPUT1" },
  	{ "Differential Mux", "Line 1", "RINPUT1" },
  	{ "Differential Mux", "Line 2", "LINPUT2" },
  	{ "Differential Mux", "Line 2", "RINPUT2" },
  
  	{ "Left ADC Mux", "Stereo", "Left PGA Mux" },
  	{ "Left ADC Mux", "Mono (Left)", "Left PGA Mux" },
  	{ "Left ADC Mux", "Digital Mono", "Left PGA Mux" },
  
  	{ "Right ADC Mux", "Stereo", "Right PGA Mux" },
  	{ "Right ADC Mux", "Mono (Right)", "Right PGA Mux" },
  	{ "Right ADC Mux", "Digital Mono", "Right PGA Mux" },
  
  	{ "Left ADC", NULL, "Left ADC Mux" },
  	{ "Right ADC", NULL, "Right ADC Mux" },
  
  	{ "Left Line Mux", "Line 1", "LINPUT1" },
  	{ "Left Line Mux", "Line 2", "LINPUT2" },
  	{ "Left Line Mux", "PGA", "Left PGA Mux" },
  	{ "Left Line Mux", "Differential", "Differential Mux" },
  
  	{ "Right Line Mux", "Line 1", "RINPUT1" },
  	{ "Right Line Mux", "Line 2", "RINPUT2" },
  	{ "Right Line Mux", "PGA", "Right PGA Mux" },
  	{ "Right Line Mux", "Differential", "Differential Mux" },
  
  	{ "Left Mixer", "Playback Switch", "Left DAC" },
  	{ "Left Mixer", "Left Bypass Switch", "Left Line Mux" },
  	{ "Left Mixer", "Right Playback Switch", "Right DAC" },
  	{ "Left Mixer", "Right Bypass Switch", "Right Line Mux" },
  
  	{ "Right Mixer", "Left Playback Switch", "Left DAC" },
  	{ "Right Mixer", "Left Bypass Switch", "Left Line Mux" },
  	{ "Right Mixer", "Playback Switch", "Right DAC" },
  	{ "Right Mixer", "Right Bypass Switch", "Right Line Mux" },
  
  	{ "Left Out 1", NULL, "Left Mixer" },
  	{ "LOUT1", NULL, "Left Out 1" },
  	{ "Right Out 1", NULL, "Right Mixer" },
  	{ "ROUT1", NULL, "Right Out 1" },
  
  	{ "Left Out 2", NULL, "Left Mixer" },
  	{ "LOUT2", NULL, "Left Out 2" },
  	{ "Right Out 2", NULL, "Right Mixer" },
  	{ "ROUT2", NULL, "Right Out 2" },
  };
  
  struct _coeff_div {
  	u32 mclk;
  	u32 rate;
  	u16 fs;
  	u8 sr:5;
  	u8 usb:1;
  };
  
  /* codec hifi mclk clock divider coefficients */
  static const struct _coeff_div coeff_div[] = {
  	/* 8k */
  	{12288000, 8000, 1536, 0x6, 0x0},
  	{11289600, 8000, 1408, 0x16, 0x0},
  	{18432000, 8000, 2304, 0x7, 0x0},
  	{16934400, 8000, 2112, 0x17, 0x0},
  	{12000000, 8000, 1500, 0x6, 0x1},
  
  	/* 11.025k */
  	{11289600, 11025, 1024, 0x18, 0x0},
  	{16934400, 11025, 1536, 0x19, 0x0},
  	{12000000, 11025, 1088, 0x19, 0x1},
  
  	/* 16k */
  	{12288000, 16000, 768, 0xa, 0x0},
  	{18432000, 16000, 1152, 0xb, 0x0},
  	{12000000, 16000, 750, 0xa, 0x1},
  
  	/* 22.05k */
  	{11289600, 22050, 512, 0x1a, 0x0},
  	{16934400, 22050, 768, 0x1b, 0x0},
  	{12000000, 22050, 544, 0x1b, 0x1},
  
  	/* 32k */
  	{12288000, 32000, 384, 0xc, 0x0},
  	{18432000, 32000, 576, 0xd, 0x0},
  	{12000000, 32000, 375, 0xa, 0x1},
  
  	/* 44.1k */
  	{11289600, 44100, 256, 0x10, 0x0},
  	{16934400, 44100, 384, 0x11, 0x0},
  	{12000000, 44100, 272, 0x11, 0x1},
  
  	/* 48k */
  	{12288000, 48000, 256, 0x0, 0x0},
  	{18432000, 48000, 384, 0x1, 0x0},
  	{12000000, 48000, 250, 0x0, 0x1},
  
  	/* 88.2k */
  	{11289600, 88200, 128, 0x1e, 0x0},
  	{16934400, 88200, 192, 0x1f, 0x0},
  	{12000000, 88200, 136, 0x1f, 0x1},
  
  	/* 96k */
  	{12288000, 96000, 128, 0xe, 0x0},
  	{18432000, 96000, 192, 0xf, 0x0},
  	{12000000, 96000, 125, 0xe, 0x1},
  };
  
  static inline int get_coeff(int mclk, int rate)
  {
  	int i;
  
  	for (i = 0; i < ARRAY_SIZE(coeff_div); i++) {
  		if (coeff_div[i].rate == rate && coeff_div[i].mclk == mclk)
  			return i;
  	}
  
  	return -EINVAL;
  }
  
  /* The set of rates we can generate from the above for each SYSCLK */
  
  static unsigned int rates_12288[] = {
  	8000, 12000, 16000, 24000, 24000, 32000, 48000, 96000,
  };
  
  static struct snd_pcm_hw_constraint_list constraints_12288 = {
  	.count	= ARRAY_SIZE(rates_12288),
  	.list	= rates_12288,
  };
  
  static unsigned int rates_112896[] = {
  	8000, 11025, 22050, 44100,
  };
  
  static struct snd_pcm_hw_constraint_list constraints_112896 = {
  	.count	= ARRAY_SIZE(rates_112896),
  	.list	= rates_112896,
  };
  
  static unsigned int rates_12[] = {
  	8000, 11025, 12000, 16000, 22050, 2400, 32000, 41100, 48000,
  	48000, 88235, 96000,
  };
  
  static struct snd_pcm_hw_constraint_list constraints_12 = {
  	.count	= ARRAY_SIZE(rates_12),
  	.list	= rates_12,
  };
  
  /*
   * Note that this should be called from init rather than from hw_params.
   */
  static int wm8988_set_dai_sysclk(struct snd_soc_dai *codec_dai,
  		int clk_id, unsigned int freq, int dir)
  {
  	struct snd_soc_codec *codec = codec_dai->codec;

  	struct wm8988_priv *wm8988 = snd_soc_codec_get_drvdata(codec);

  
  	switch (freq) {
  	case 11289600:
  	case 18432000:
  	case 22579200:
  	case 36864000:
  		wm8988->sysclk_constraints = &constraints_112896;
  		wm8988->sysclk = freq;
  		return 0;
  
  	case 12288000:
  	case 16934400:
  	case 24576000:
  	case 33868800:
  		wm8988->sysclk_constraints = &constraints_12288;
  		wm8988->sysclk = freq;
  		return 0;
  
  	case 12000000:
  	case 24000000:
  		wm8988->sysclk_constraints = &constraints_12;
  		wm8988->sysclk = freq;
  		return 0;
  	}
  	return -EINVAL;
  }
  
  static int wm8988_set_dai_fmt(struct snd_soc_dai *codec_dai,
  		unsigned int fmt)
  {
  	struct snd_soc_codec *codec = codec_dai->codec;
  	u16 iface = 0;
  
  	/* set master/slave audio interface */
  	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
  	case SND_SOC_DAIFMT_CBM_CFM:
  		iface = 0x0040;
  		break;
  	case SND_SOC_DAIFMT_CBS_CFS:
  		break;
  	default:
  		return -EINVAL;
  	}
  
  	/* interface format */
  	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
  	case SND_SOC_DAIFMT_I2S:
  		iface |= 0x0002;
  		break;
  	case SND_SOC_DAIFMT_RIGHT_J:
  		break;
  	case SND_SOC_DAIFMT_LEFT_J:
  		iface |= 0x0001;
  		break;
  	case SND_SOC_DAIFMT_DSP_A:
  		iface |= 0x0003;
  		break;
  	case SND_SOC_DAIFMT_DSP_B:
  		iface |= 0x0013;
  		break;
  	default:
  		return -EINVAL;
  	}
  
  	/* clock inversion */
  	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
  	case SND_SOC_DAIFMT_NB_NF:
  		break;
  	case SND_SOC_DAIFMT_IB_IF:
  		iface |= 0x0090;
  		break;
  	case SND_SOC_DAIFMT_IB_NF:
  		iface |= 0x0080;
  		break;
  	case SND_SOC_DAIFMT_NB_IF:
  		iface |= 0x0010;
  		break;
  	default:
  		return -EINVAL;
  	}

  	snd_soc_write(codec, WM8988_IFACE, iface);

  	return 0;
  }
  
  static int wm8988_pcm_startup(struct snd_pcm_substream *substream,
  			      struct snd_soc_dai *dai)
  {
  	struct snd_soc_codec *codec = dai->codec;

  	struct wm8988_priv *wm8988 = snd_soc_codec_get_drvdata(codec);

  
  	/* The set of sample rates that can be supported depends on the
  	 * MCLK supplied to the CODEC - enforce this.
  	 */
  	if (!wm8988->sysclk) {
  		dev_err(codec->dev,
  			"No MCLK configured, call set_sysclk() on init
  ");
  		return -EINVAL;
  	}
  
  	snd_pcm_hw_constraint_list(substream->runtime, 0,
  				   SNDRV_PCM_HW_PARAM_RATE,
  				   wm8988->sysclk_constraints);
  
  	return 0;
  }
  
  static int wm8988_pcm_hw_params(struct snd_pcm_substream *substream,
  				struct snd_pcm_hw_params *params,
  				struct snd_soc_dai *dai)
  {

  	struct snd_soc_codec *codec = dai->codec;

  	struct wm8988_priv *wm8988 = snd_soc_codec_get_drvdata(codec);

  	u16 iface = snd_soc_read(codec, WM8988_IFACE) & 0x1f3;
  	u16 srate = snd_soc_read(codec, WM8988_SRATE) & 0x180;

  	int coeff;
  
  	coeff = get_coeff(wm8988->sysclk, params_rate(params));
  	if (coeff < 0) {
  		coeff = get_coeff(wm8988->sysclk / 2, params_rate(params));
  		srate |= 0x40;
  	}
  	if (coeff < 0) {
  		dev_err(codec->dev,
  			"Unable to configure sample rate %dHz with %dHz MCLK
  ",
  			params_rate(params), wm8988->sysclk);
  		return coeff;
  	}
  
  	/* bit size */
  	switch (params_format(params)) {
  	case SNDRV_PCM_FORMAT_S16_LE:
  		break;
  	case SNDRV_PCM_FORMAT_S20_3LE:
  		iface |= 0x0004;
  		break;
  	case SNDRV_PCM_FORMAT_S24_LE:
  		iface |= 0x0008;
  		break;
  	case SNDRV_PCM_FORMAT_S32_LE:
  		iface |= 0x000c;
  		break;
  	}
  
  	/* set iface & srate */

  	snd_soc_write(codec, WM8988_IFACE, iface);

  	if (coeff >= 0)

  		snd_soc_write(codec, WM8988_SRATE, srate |

  			(coeff_div[coeff].sr << 1) | coeff_div[coeff].usb);
  
  	return 0;
  }
  
  static int wm8988_mute(struct snd_soc_dai *dai, int mute)
  {
  	struct snd_soc_codec *codec = dai->codec;

  	u16 mute_reg = snd_soc_read(codec, WM8988_ADCDAC) & 0xfff7;

  
  	if (mute)

  		snd_soc_write(codec, WM8988_ADCDAC, mute_reg | 0x8);

  	else

  		snd_soc_write(codec, WM8988_ADCDAC, mute_reg);

  	return 0;
  }
  
  static int wm8988_set_bias_level(struct snd_soc_codec *codec,
  				 enum snd_soc_bias_level level)
  {

  	struct wm8988_priv *wm8988 = snd_soc_codec_get_drvdata(codec);

  	u16 pwr_reg = snd_soc_read(codec, WM8988_PWR1) & ~0x1c1;

  
  	switch (level) {
  	case SND_SOC_BIAS_ON:
  		break;
  
  	case SND_SOC_BIAS_PREPARE:
  		/* VREF, VMID=2x50k, digital enabled */

  		snd_soc_write(codec, WM8988_PWR1, pwr_reg | 0x00c0);

  		break;
  
  	case SND_SOC_BIAS_STANDBY:

  		if (codec->dapm.bias_level == SND_SOC_BIAS_OFF) {

  			regcache_sync(wm8988->regmap);

  			/* VREF, VMID=2x5k */

  			snd_soc_write(codec, WM8988_PWR1, pwr_reg | 0x1c1);

  
  			/* Charge caps */
  			msleep(100);
  		}
  
  		/* VREF, VMID=2*500k, digital stopped */

  		snd_soc_write(codec, WM8988_PWR1, pwr_reg | 0x0141);

  		break;
  
  	case SND_SOC_BIAS_OFF:

  		snd_soc_write(codec, WM8988_PWR1, 0x0000);

  		break;
  	}

  	codec->dapm.bias_level = level;

  	return 0;
  }
  
  #define WM8988_RATES SNDRV_PCM_RATE_8000_96000
  
  #define WM8988_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
  	SNDRV_PCM_FMTBIT_S24_LE)

  static const struct snd_soc_dai_ops wm8988_ops = {

  	.startup = wm8988_pcm_startup,
  	.hw_params = wm8988_pcm_hw_params,
  	.set_fmt = wm8988_set_dai_fmt,
  	.set_sysclk = wm8988_set_dai_sysclk,
  	.digital_mute = wm8988_mute,
  };

  static struct snd_soc_dai_driver wm8988_dai = {
  	.name = "wm8988-hifi",

  	.playback = {
  		.stream_name = "Playback",
  		.channels_min = 1,
  		.channels_max = 2,
  		.rates = WM8988_RATES,
  		.formats = WM8988_FORMATS,
  	},
  	.capture = {
  		.stream_name = "Capture",
  		.channels_min = 1,
  		.channels_max = 2,
  		.rates = WM8988_RATES,
  		.formats = WM8988_FORMATS,
  	 },
  	.ops = &wm8988_ops,
  	.symmetric_rates = 1,
  };

  static int wm8988_suspend(struct snd_soc_codec *codec)

  {

  	struct wm8988_priv *wm8988 = snd_soc_codec_get_drvdata(codec);

  	wm8988_set_bias_level(codec, SND_SOC_BIAS_OFF);

  	regcache_mark_dirty(wm8988->regmap);

  	return 0;
  }

  static int wm8988_resume(struct snd_soc_codec *codec)

  {

  	wm8988_set_bias_level(codec, SND_SOC_BIAS_STANDBY);

  	return 0;
  }

  static int wm8988_probe(struct snd_soc_codec *codec)

  {

  	struct wm8988_priv *wm8988 = snd_soc_codec_get_drvdata(codec);

  	int ret = 0;

  	codec->control_data = wm8988->regmap;
  	ret = snd_soc_codec_set_cache_io(codec, 7, 9, SND_SOC_REGMAP);

  	if (ret < 0) {
  		dev_err(codec->dev, "Failed to set cache I/O: %d
  ", ret);

  		return ret;

  	}

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

  		return ret;

  	}
  
  	/* set the update bits (we always update left then right) */

  	snd_soc_update_bits(codec, WM8988_RADC, 0x0100, 0x0100);
  	snd_soc_update_bits(codec, WM8988_RDAC, 0x0100, 0x0100);
  	snd_soc_update_bits(codec, WM8988_ROUT1V, 0x0100, 0x0100);
  	snd_soc_update_bits(codec, WM8988_ROUT2V, 0x0100, 0x0100);
  	snd_soc_update_bits(codec, WM8988_RINVOL, 0x0100, 0x0100);

  	wm8988_set_bias_level(codec, SND_SOC_BIAS_STANDBY);

  	return 0;

  }

  static int wm8988_remove(struct snd_soc_codec *codec)

  {

  	wm8988_set_bias_level(codec, SND_SOC_BIAS_OFF);
  	return 0;

  }

  static struct snd_soc_codec_driver soc_codec_dev_wm8988 = {
  	.probe =	wm8988_probe,
  	.remove =	wm8988_remove,
  	.suspend =	wm8988_suspend,
  	.resume =	wm8988_resume,
  	.set_bias_level = wm8988_set_bias_level,

  
  	.controls = wm8988_snd_controls,
  	.num_controls = ARRAY_SIZE(wm8988_snd_controls),
  	.dapm_widgets = wm8988_dapm_widgets,
  	.num_dapm_widgets = ARRAY_SIZE(wm8988_dapm_widgets),
  	.dapm_routes = wm8988_dapm_routes,
  	.num_dapm_routes = ARRAY_SIZE(wm8988_dapm_routes),

  };

  static struct regmap_config wm8988_regmap = {
  	.reg_bits = 7,
  	.val_bits = 9,
  
  	.max_register = WM8988_LPPB,
  	.writeable_reg = wm8988_writeable,
  
  	.cache_type = REGCACHE_RBTREE,
  	.reg_defaults = wm8988_reg_defaults,
  	.num_reg_defaults = ARRAY_SIZE(wm8988_reg_defaults),
  };

  #if defined(CONFIG_SPI_MASTER)

  static int wm8988_spi_probe(struct spi_device *spi)

  {
  	struct wm8988_priv *wm8988;

  	int ret;

  	wm8988 = devm_kzalloc(&spi->dev, sizeof(struct wm8988_priv),
  			      GFP_KERNEL);

  	if (wm8988 == NULL)
  		return -ENOMEM;

  	wm8988->regmap = devm_regmap_init_spi(spi, &wm8988_regmap);

  	if (IS_ERR(wm8988->regmap)) {
  		ret = PTR_ERR(wm8988->regmap);
  		dev_err(&spi->dev, "Failed to init regmap: %d
  ", ret);
  		return ret;
  	}

  	spi_set_drvdata(spi, wm8988);

  	ret = snd_soc_register_codec(&spi->dev,
  			&soc_codec_dev_wm8988, &wm8988_dai, 1);

  	return ret;

  }

  static int wm8988_spi_remove(struct spi_device *spi)

  {

  	snd_soc_unregister_codec(&spi->dev);

  	return 0;
  }

  static struct spi_driver wm8988_spi_driver = {

  	.driver = {

  		.name	= "wm8988",

  		.owner	= THIS_MODULE,

  	},

  	.probe		= wm8988_spi_probe,

  	.remove		= wm8988_spi_remove,

  };

  #endif /* CONFIG_SPI_MASTER */

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

  static int wm8988_i2c_probe(struct i2c_client *i2c,
  			    const struct i2c_device_id *id)

  {
  	struct wm8988_priv *wm8988;

  	int ret;

  	wm8988 = devm_kzalloc(&i2c->dev, sizeof(struct wm8988_priv),
  			      GFP_KERNEL);

  	if (wm8988 == NULL)
  		return -ENOMEM;

  	i2c_set_clientdata(i2c, wm8988);

  	wm8988->regmap = devm_regmap_init_i2c(i2c, &wm8988_regmap);

  	if (IS_ERR(wm8988->regmap)) {
  		ret = PTR_ERR(wm8988->regmap);
  		dev_err(&i2c->dev, "Failed to init regmap: %d
  ", ret);
  		return ret;
  	}

  	ret =  snd_soc_register_codec(&i2c->dev,
  			&soc_codec_dev_wm8988, &wm8988_dai, 1);

  	return ret;

  }

  static int wm8988_i2c_remove(struct i2c_client *client)

  {

  	snd_soc_unregister_codec(&client->dev);

  	return 0;
  }

  static const struct i2c_device_id wm8988_i2c_id[] = {
  	{ "wm8988", 0 },
  	{ }
  };
  MODULE_DEVICE_TABLE(i2c, wm8988_i2c_id);
  
  static struct i2c_driver wm8988_i2c_driver = {

  	.driver = {

  		.name = "wm8988",

  		.owner = THIS_MODULE,

  	},

  	.probe =    wm8988_i2c_probe,

  	.remove =   wm8988_i2c_remove,

  	.id_table = wm8988_i2c_id,

  };
  #endif
  
  static int __init wm8988_modinit(void)
  {

  	int ret = 0;

  #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
  	ret = i2c_add_driver(&wm8988_i2c_driver);

  	if (ret != 0) {
  		printk(KERN_ERR "Failed to register WM8988 I2C driver: %d
  ",
  		       ret);
  	}

  #endif
  #if defined(CONFIG_SPI_MASTER)
  	ret = spi_register_driver(&wm8988_spi_driver);

  	if (ret != 0) {
  		printk(KERN_ERR "Failed to register WM8988 SPI driver: %d
  ",
  		       ret);
  	}

  #endif
  	return ret;
  }
  module_init(wm8988_modinit);
  
  static void __exit wm8988_exit(void)
  {
  #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
  	i2c_del_driver(&wm8988_i2c_driver);
  #endif
  #if defined(CONFIG_SPI_MASTER)
  	spi_unregister_driver(&wm8988_spi_driver);
  #endif
  }
  module_exit(wm8988_exit);
  
  
  MODULE_DESCRIPTION("ASoC WM8988 driver");
  MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
  MODULE_LICENSE("GPL");