text: /*
   * wm8770.c  --  WM8770 ALSA SoC Audio driver
   *
   * Copyright 2010 Wolfson Microelectronics plc
   *
   * Author: Dimitris Papastamos <dp@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/of_device.h>
  #include <linux/pm.h>
  #include <linux/spi/spi.h>
  #include <linux/regmap.h>
  #include <linux/regulator/consumer.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 "wm8770.h"
  
  #define WM8770_NUM_SUPPLIES 3
  static const char *wm8770_supply_names[WM8770_NUM_SUPPLIES] = {
  	"AVDD1",
  	"AVDD2",
  	"DVDD"
  };
  
  static const struct reg_default wm8770_reg_defaults[] = {
  	{  0, 0x7f },
  	{  1, 0x7f },
  	{  2, 0x7f },
  	{  3, 0x7f },
  	{  4, 0x7f },
  	{  5, 0x7f },
  	{  6, 0x7f },
  	{  7, 0x7f },
  	{  8, 0x7f },
  	{  9, 0xff },
  	{ 10, 0xff },
  	{ 11, 0xff },
  	{ 12, 0xff },
  	{ 13, 0xff },
  	{ 14, 0xff },
  	{ 15, 0xff },
  	{ 16, 0xff },
  	{ 17, 0xff },
  	{ 18, 0    },
  	{ 19, 0x90 },
  	{ 20, 0    },
  	{ 21, 0    },
  	{ 22, 0x22 },
  	{ 23, 0x22 },
  	{ 24, 0x3e },
  	{ 25, 0xc  },
  	{ 26, 0xc  },
  	{ 27, 0x100 },
  	{ 28, 0x189 },
  	{ 29, 0x189 },
  	{ 30, 0x8770 },
  };
  
  static bool wm8770_volatile_reg(struct device *dev, unsigned int reg)
  {
  	switch (reg) {
  	case WM8770_RESET:
  		return true;
  	default:
  		return false;
  	}
  }
  
  struct wm8770_priv {
  	struct regmap *regmap;
  	struct regulator_bulk_data supplies[WM8770_NUM_SUPPLIES];
  	struct notifier_block disable_nb[WM8770_NUM_SUPPLIES];
  	struct snd_soc_codec *codec;
  	int sysclk;
  };
  
  static int vout12supply_event(struct snd_soc_dapm_widget *w,
  	struct snd_kcontrol *kcontrol, int event);
  static int vout34supply_event(struct snd_soc_dapm_widget *w,
  	struct snd_kcontrol *kcontrol, int event);
  
  /*
   * We can't use the same notifier block for more than one supply and
   * there's no way I can see to get from a callback to the caller
   * except container_of().
   */
  #define WM8770_REGULATOR_EVENT(n) \
  static int wm8770_regulator_event_##n(struct notifier_block *nb, \
  				      unsigned long event, void *data)    \
  { \
  	struct wm8770_priv *wm8770 = container_of(nb, struct wm8770_priv, \
  				     disable_nb[n]); \
  	if (event & REGULATOR_EVENT_DISABLE) { \
  		regcache_mark_dirty(wm8770->regmap);	\
  	} \
  	return 0; \
  }
  
  WM8770_REGULATOR_EVENT(0)
  WM8770_REGULATOR_EVENT(1)
  WM8770_REGULATOR_EVENT(2)
  
  static const DECLARE_TLV_DB_SCALE(adc_tlv, -1200, 100, 0);
  static const DECLARE_TLV_DB_SCALE(dac_dig_tlv, -12750, 50, 1);
  static const DECLARE_TLV_DB_SCALE(dac_alg_tlv, -12700, 100, 1);
  
  static const char *dac_phase_text[][2] = {
  	{ "DAC1 Normal", "DAC1 Inverted" },
  	{ "DAC2 Normal", "DAC2 Inverted" },
  	{ "DAC3 Normal", "DAC3 Inverted" },
  	{ "DAC4 Normal", "DAC4 Inverted" },
  };
  
  static const struct soc_enum dac_phase[] = {
  	SOC_ENUM_DOUBLE(WM8770_DACPHASE, 0, 1, 2, dac_phase_text[0]),
  	SOC_ENUM_DOUBLE(WM8770_DACPHASE, 2, 3, 2, dac_phase_text[1]),
  	SOC_ENUM_DOUBLE(WM8770_DACPHASE, 4, 5, 2, dac_phase_text[2]),
  	SOC_ENUM_DOUBLE(WM8770_DACPHASE, 6, 7, 2, dac_phase_text[3]),
  };
  
  static const struct snd_kcontrol_new wm8770_snd_controls[] = {
  	/* global DAC playback controls */
  	SOC_SINGLE_TLV("DAC Playback Volume", WM8770_MSDIGVOL, 0, 255, 0,
  		dac_dig_tlv),
  	SOC_SINGLE("DAC Playback Switch", WM8770_DACMUTE, 4, 1, 1),
  	SOC_SINGLE("DAC Playback ZC Switch", WM8770_DACCTRL1, 0, 1, 0),
  
  	/* global VOUT playback controls */
  	SOC_SINGLE_TLV("VOUT Playback Volume", WM8770_MSALGVOL, 0, 127, 0,
  		dac_alg_tlv),
  	SOC_SINGLE("VOUT Playback ZC Switch", WM8770_MSALGVOL, 7, 1, 0),
  
  	/* VOUT1/2/3/4 specific controls */
  	SOC_DOUBLE_R_TLV("VOUT1 Playback Volume", WM8770_VOUT1LVOL,
  		WM8770_VOUT1RVOL, 0, 127, 0, dac_alg_tlv),
  	SOC_DOUBLE_R("VOUT1 Playback ZC Switch", WM8770_VOUT1LVOL,
  		WM8770_VOUT1RVOL, 7, 1, 0),
  	SOC_DOUBLE_R_TLV("VOUT2 Playback Volume", WM8770_VOUT2LVOL,
  		WM8770_VOUT2RVOL, 0, 127, 0, dac_alg_tlv),
  	SOC_DOUBLE_R("VOUT2 Playback ZC Switch", WM8770_VOUT2LVOL,
  		WM8770_VOUT2RVOL, 7, 1, 0),
  	SOC_DOUBLE_R_TLV("VOUT3 Playback Volume", WM8770_VOUT3LVOL,
  		WM8770_VOUT3RVOL, 0, 127, 0, dac_alg_tlv),
  	SOC_DOUBLE_R("VOUT3 Playback ZC Switch", WM8770_VOUT3LVOL,
  		WM8770_VOUT3RVOL, 7, 1, 0),
  	SOC_DOUBLE_R_TLV("VOUT4 Playback Volume", WM8770_VOUT4LVOL,
  		WM8770_VOUT4RVOL, 0, 127, 0, dac_alg_tlv),
  	SOC_DOUBLE_R("VOUT4 Playback ZC Switch", WM8770_VOUT4LVOL,
  		WM8770_VOUT4RVOL, 7, 1, 0),
  
  	/* DAC1/2/3/4 specific controls */
  	SOC_DOUBLE_R_TLV("DAC1 Playback Volume", WM8770_DAC1LVOL,
  		WM8770_DAC1RVOL, 0, 255, 0, dac_dig_tlv),
  	SOC_SINGLE("DAC1 Deemphasis Switch", WM8770_DACCTRL2, 0, 1, 0),
  	SOC_ENUM("DAC1 Phase", dac_phase[0]),
  	SOC_DOUBLE_R_TLV("DAC2 Playback Volume", WM8770_DAC2LVOL,
  		WM8770_DAC2RVOL, 0, 255, 0, dac_dig_tlv),
  	SOC_SINGLE("DAC2 Deemphasis Switch", WM8770_DACCTRL2, 1, 1, 0),
  	SOC_ENUM("DAC2 Phase", dac_phase[1]),
  	SOC_DOUBLE_R_TLV("DAC3 Playback Volume", WM8770_DAC3LVOL,
  		WM8770_DAC3RVOL, 0, 255, 0, dac_dig_tlv),
  	SOC_SINGLE("DAC3 Deemphasis Switch", WM8770_DACCTRL2, 2, 1, 0),
  	SOC_ENUM("DAC3 Phase", dac_phase[2]),
  	SOC_DOUBLE_R_TLV("DAC4 Playback Volume", WM8770_DAC4LVOL,
  		WM8770_DAC4RVOL, 0, 255, 0, dac_dig_tlv),
  	SOC_SINGLE("DAC4 Deemphasis Switch", WM8770_DACCTRL2, 3, 1, 0),
  	SOC_ENUM("DAC4 Phase", dac_phase[3]),
  
  	/* ADC specific controls */
  	SOC_DOUBLE_R_TLV("Capture Volume", WM8770_ADCLCTRL, WM8770_ADCRCTRL,
  		0, 31, 0, adc_tlv),
  	SOC_DOUBLE_R("Capture Switch", WM8770_ADCLCTRL, WM8770_ADCRCTRL,
  		5, 1, 1),
  
  	/* other controls */
  	SOC_SINGLE("ADC 128x Oversampling Switch", WM8770_MSTRCTRL, 3, 1, 0),
  	SOC_SINGLE("ADC Highpass Filter Switch", WM8770_IFACECTRL, 8, 1, 1)
  };
  
  static const char *ain_text[] = {
  	"AIN1", "AIN2", "AIN3", "AIN4",
  	"AIN5", "AIN6", "AIN7", "AIN8"
  };
  
  static SOC_ENUM_DOUBLE_DECL(ain_enum,
  			    WM8770_ADCMUX, 0, 4, ain_text);
  
  static const struct snd_kcontrol_new ain_mux =
  	SOC_DAPM_ENUM("Capture Mux", ain_enum);
  
  static const struct snd_kcontrol_new vout1_mix_controls[] = {
  	SOC_DAPM_SINGLE("DAC1 Switch", WM8770_OUTMUX1, 0, 1, 0),
  	SOC_DAPM_SINGLE("AUX1 Switch", WM8770_OUTMUX1, 1, 1, 0),
  	SOC_DAPM_SINGLE("Bypass Switch", WM8770_OUTMUX1, 2, 1, 0)
  };
  
  static const struct snd_kcontrol_new vout2_mix_controls[] = {
  	SOC_DAPM_SINGLE("DAC2 Switch", WM8770_OUTMUX1, 3, 1, 0),
  	SOC_DAPM_SINGLE("AUX2 Switch", WM8770_OUTMUX1, 4, 1, 0),
  	SOC_DAPM_SINGLE("Bypass Switch", WM8770_OUTMUX1, 5, 1, 0)
  };
  
  static const struct snd_kcontrol_new vout3_mix_controls[] = {
  	SOC_DAPM_SINGLE("DAC3 Switch", WM8770_OUTMUX2, 0, 1, 0),
  	SOC_DAPM_SINGLE("AUX3 Switch", WM8770_OUTMUX2, 1, 1, 0),
  	SOC_DAPM_SINGLE("Bypass Switch", WM8770_OUTMUX2, 2, 1, 0)
  };
  
  static const struct snd_kcontrol_new vout4_mix_controls[] = {
  	SOC_DAPM_SINGLE("DAC4 Switch", WM8770_OUTMUX2, 3, 1, 0),
  	SOC_DAPM_SINGLE("Bypass Switch", WM8770_OUTMUX2, 4, 1, 0)
  };
  
  static const struct snd_soc_dapm_widget wm8770_dapm_widgets[] = {
  	SND_SOC_DAPM_INPUT("AUX1"),
  	SND_SOC_DAPM_INPUT("AUX2"),
  	SND_SOC_DAPM_INPUT("AUX3"),
  
  	SND_SOC_DAPM_INPUT("AIN1"),
  	SND_SOC_DAPM_INPUT("AIN2"),
  	SND_SOC_DAPM_INPUT("AIN3"),
  	SND_SOC_DAPM_INPUT("AIN4"),
  	SND_SOC_DAPM_INPUT("AIN5"),
  	SND_SOC_DAPM_INPUT("AIN6"),
  	SND_SOC_DAPM_INPUT("AIN7"),
  	SND_SOC_DAPM_INPUT("AIN8"),
  
  	SND_SOC_DAPM_MUX("Capture Mux", WM8770_ADCMUX, 8, 1, &ain_mux),
  
  	SND_SOC_DAPM_ADC("ADC", "Capture", WM8770_PWDNCTRL, 1, 1),
  
  	SND_SOC_DAPM_DAC("DAC1", "Playback", WM8770_PWDNCTRL, 2, 1),
  	SND_SOC_DAPM_DAC("DAC2", "Playback", WM8770_PWDNCTRL, 3, 1),
  	SND_SOC_DAPM_DAC("DAC3", "Playback", WM8770_PWDNCTRL, 4, 1),
  	SND_SOC_DAPM_DAC("DAC4", "Playback", WM8770_PWDNCTRL, 5, 1),
  
  	SND_SOC_DAPM_SUPPLY("VOUT12 Supply", SND_SOC_NOPM, 0, 0,
  		vout12supply_event, SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD),
  	SND_SOC_DAPM_SUPPLY("VOUT34 Supply", SND_SOC_NOPM, 0, 0,
  		vout34supply_event, SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD),
  
  	SND_SOC_DAPM_MIXER("VOUT1 Mixer", SND_SOC_NOPM, 0, 0,
  		vout1_mix_controls, ARRAY_SIZE(vout1_mix_controls)),
  	SND_SOC_DAPM_MIXER("VOUT2 Mixer", SND_SOC_NOPM, 0, 0,
  		vout2_mix_controls, ARRAY_SIZE(vout2_mix_controls)),
  	SND_SOC_DAPM_MIXER("VOUT3 Mixer", SND_SOC_NOPM, 0, 0,
  		vout3_mix_controls, ARRAY_SIZE(vout3_mix_controls)),
  	SND_SOC_DAPM_MIXER("VOUT4 Mixer", SND_SOC_NOPM, 0, 0,
  		vout4_mix_controls, ARRAY_SIZE(vout4_mix_controls)),
  
  	SND_SOC_DAPM_OUTPUT("VOUT1"),
  	SND_SOC_DAPM_OUTPUT("VOUT2"),
  	SND_SOC_DAPM_OUTPUT("VOUT3"),
  	SND_SOC_DAPM_OUTPUT("VOUT4")
  };
  
  static const struct snd_soc_dapm_route wm8770_intercon[] = {
  	{ "Capture Mux", "AIN1", "AIN1" },
  	{ "Capture Mux", "AIN2", "AIN2" },
  	{ "Capture Mux", "AIN3", "AIN3" },
  	{ "Capture Mux", "AIN4", "AIN4" },
  	{ "Capture Mux", "AIN5", "AIN5" },
  	{ "Capture Mux", "AIN6", "AIN6" },
  	{ "Capture Mux", "AIN7", "AIN7" },
  	{ "Capture Mux", "AIN8", "AIN8" },
  
  	{ "ADC", NULL, "Capture Mux" },
  
  	{ "VOUT1 Mixer", NULL, "VOUT12 Supply" },
  	{ "VOUT1 Mixer", "DAC1 Switch", "DAC1" },
  	{ "VOUT1 Mixer", "AUX1 Switch", "AUX1" },
  	{ "VOUT1 Mixer", "Bypass Switch", "Capture Mux" },
  
  	{ "VOUT2 Mixer", NULL, "VOUT12 Supply" },
  	{ "VOUT2 Mixer", "DAC2 Switch", "DAC2" },
  	{ "VOUT2 Mixer", "AUX2 Switch", "AUX2" },
  	{ "VOUT2 Mixer", "Bypass Switch", "Capture Mux" },
  
  	{ "VOUT3 Mixer", NULL, "VOUT34 Supply" },
  	{ "VOUT3 Mixer", "DAC3 Switch", "DAC3" },
  	{ "VOUT3 Mixer", "AUX3 Switch", "AUX3" },
  	{ "VOUT3 Mixer", "Bypass Switch", "Capture Mux" },
  
  	{ "VOUT4 Mixer", NULL, "VOUT34 Supply" },
  	{ "VOUT4 Mixer", "DAC4 Switch", "DAC4" },
  	{ "VOUT4 Mixer", "Bypass Switch", "Capture Mux" },
  
  	{ "VOUT1", NULL, "VOUT1 Mixer" },
  	{ "VOUT2", NULL, "VOUT2 Mixer" },
  	{ "VOUT3", NULL, "VOUT3 Mixer" },
  	{ "VOUT4", NULL, "VOUT4 Mixer" }
  };
  
  static int vout12supply_event(struct snd_soc_dapm_widget *w,
  	struct snd_kcontrol *kcontrol, int event)
  {
  	struct snd_soc_codec *codec = snd_soc_dapm_to_codec(w->dapm);
  
  	switch (event) {
  	case SND_SOC_DAPM_PRE_PMU:
  		snd_soc_update_bits(codec, WM8770_OUTMUX1, 0x180, 0);
  		break;
  	case SND_SOC_DAPM_POST_PMD:
  		snd_soc_update_bits(codec, WM8770_OUTMUX1, 0x180, 0x180);
  		break;
  	}
  
  	return 0;
  }
  
  static int vout34supply_event(struct snd_soc_dapm_widget *w,
  	struct snd_kcontrol *kcontrol, int event)
  {
  	struct snd_soc_codec *codec = snd_soc_dapm_to_codec(w->dapm);
  
  	switch (event) {
  	case SND_SOC_DAPM_PRE_PMU:
  		snd_soc_update_bits(codec, WM8770_OUTMUX2, 0x180, 0);
  		break;
  	case SND_SOC_DAPM_POST_PMD:
  		snd_soc_update_bits(codec, WM8770_OUTMUX2, 0x180, 0x180);
  		break;
  	}
  
  	return 0;
  }
  
  static int wm8770_reset(struct snd_soc_codec *codec)
  {
  	return snd_soc_write(codec, WM8770_RESET, 0);
  }
  
  static int wm8770_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
  {
  	struct snd_soc_codec *codec;
  	int iface, master;
  
  	codec = dai->codec;
  
  	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
  	case SND_SOC_DAIFMT_CBM_CFM:
  		master = 0x100;
  		break;
  	case SND_SOC_DAIFMT_CBS_CFS:
  		master = 0;
  		break;
  	default:
  		return -EINVAL;
  	}
  
  	iface = 0;
  	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
  	case SND_SOC_DAIFMT_I2S:
  		iface |= 0x2;
  		break;
  	case SND_SOC_DAIFMT_RIGHT_J:
  		break;
  	case SND_SOC_DAIFMT_LEFT_J:
  		iface |= 0x1;
  		break;
  	default:
  		return -EINVAL;
  	}
  
  	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
  	case SND_SOC_DAIFMT_NB_NF:
  		break;
  	case SND_SOC_DAIFMT_IB_IF:
  		iface |= 0xc;
  		break;
  	case SND_SOC_DAIFMT_IB_NF:
  		iface |= 0x8;
  		break;
  	case SND_SOC_DAIFMT_NB_IF:
  		iface |= 0x4;
  		break;
  	default:
  		return -EINVAL;
  	}
  
  	snd_soc_update_bits(codec, WM8770_IFACECTRL, 0xf, iface);
  	snd_soc_update_bits(codec, WM8770_MSTRCTRL, 0x100, master);
  
  	return 0;
  }
  
  static const int mclk_ratios[] = {
  	128,
  	192,
  	256,
  	384,
  	512,
  	768
  };
  
  static int wm8770_hw_params(struct snd_pcm_substream *substream,
  			    struct snd_pcm_hw_params *params,
  			    struct snd_soc_dai *dai)
  {
  	struct snd_soc_codec *codec;
  	struct wm8770_priv *wm8770;
  	int i;
  	int iface;
  	int shift;
  	int ratio;
  
  	codec = dai->codec;
  	wm8770 = snd_soc_codec_get_drvdata(codec);
  
  	iface = 0;
  	switch (params_width(params)) {
  	case 16:
  		break;
  	case 20:
  		iface |= 0x10;
  		break;
  	case 24:
  		iface |= 0x20;
  		break;
  	case 32:
  		iface |= 0x30;
  		break;
  	}
  
  	switch (substream->stream) {
  	case SNDRV_PCM_STREAM_PLAYBACK:
  		i = 0;
  		shift = 4;
  		break;
  	case SNDRV_PCM_STREAM_CAPTURE:
  		i = 2;
  		shift = 0;
  		break;
  	default:
  		return -EINVAL;
  	}
  
  	/* Only need to set MCLK/LRCLK ratio if we're master */
  	if (snd_soc_read(codec, WM8770_MSTRCTRL) & 0x100) {
  		for (; i < ARRAY_SIZE(mclk_ratios); ++i) {
  			ratio = wm8770->sysclk / params_rate(params);
  			if (ratio == mclk_ratios[i])
  				break;
  		}
  
  		if (i == ARRAY_SIZE(mclk_ratios)) {
  			dev_err(codec->dev,
  				"Unable to configure MCLK ratio %d/%d\n",
  				wm8770->sysclk, params_rate(params));
  			return -EINVAL;
  		}
  
  		dev_dbg(codec->dev, "MCLK is %dfs\n", mclk_ratios[i]);
  
  		snd_soc_update_bits(codec, WM8770_MSTRCTRL, 0x7 << shift,
  				    i << shift);
  	}
  
  	snd_soc_update_bits(codec, WM8770_IFACECTRL, 0x30, iface);
  
  	return 0;
  }
  
  static int wm8770_mute(struct snd_soc_dai *dai, int mute)
  {
  	struct snd_soc_codec *codec;
  
  	codec = dai->codec;
  	return snd_soc_update_bits(codec, WM8770_DACMUTE, 0x10,
  				   !!mute << 4);
  }
  
  static int wm8770_set_sysclk(struct snd_soc_dai *dai,
  			     int clk_id, unsigned int freq, int dir)
  {
  	struct snd_soc_codec *codec;
  	struct wm8770_priv *wm8770;
  
  	codec = dai->codec;
  	wm8770 = snd_soc_codec_get_drvdata(codec);
  	wm8770->sysclk = freq;
  	return 0;
  }
  
  static int wm8770_set_bias_level(struct snd_soc_codec *codec,
  				 enum snd_soc_bias_level level)
  {
  	int ret;
  	struct wm8770_priv *wm8770;
  
  	wm8770 = snd_soc_codec_get_drvdata(codec);
  
  	switch (level) {
  	case SND_SOC_BIAS_ON:
  		break;
  	case SND_SOC_BIAS_PREPARE:
  		break;
  	case SND_SOC_BIAS_STANDBY:
  		if (snd_soc_codec_get_bias_level(codec) == SND_SOC_BIAS_OFF) {
  			ret = regulator_bulk_enable(ARRAY_SIZE(wm8770->supplies),
  						    wm8770->supplies);
  			if (ret) {
  				dev_err(codec->dev,
  					"Failed to enable supplies: %d\n",
  					ret);
  				return ret;
  			}
  
  			regcache_sync(wm8770->regmap);
  
  			/* global powerup */
  			snd_soc_write(codec, WM8770_PWDNCTRL, 0);
  		}
  		break;
  	case SND_SOC_BIAS_OFF:
  		/* global powerdown */
  		snd_soc_write(codec, WM8770_PWDNCTRL, 1);
  		regulator_bulk_disable(ARRAY_SIZE(wm8770->supplies),
  				       wm8770->supplies);
  		break;
  	}
  
  	return 0;
  }
  
  #define WM8770_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE | \
  			SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S32_LE)
  
  static const struct snd_soc_dai_ops wm8770_dai_ops = {
  	.digital_mute = wm8770_mute,
  	.hw_params = wm8770_hw_params,
  	.set_fmt = wm8770_set_fmt,
  	.set_sysclk = wm8770_set_sysclk,
  };
  
  static struct snd_soc_dai_driver wm8770_dai = {
  	.name = "wm8770-hifi",
  	.playback = {
  		.stream_name = "Playback",
  		.channels_min = 2,
  		.channels_max = 2,
  		.rates = SNDRV_PCM_RATE_8000_192000,
  		.formats = WM8770_FORMATS
  	},
  	.capture = {
  		.stream_name = "Capture",
  		.channels_min = 2,
  		.channels_max = 2,
  		.rates = SNDRV_PCM_RATE_8000_96000,
  		.formats = WM8770_FORMATS
  	},
  	.ops = &wm8770_dai_ops,
  	.symmetric_rates = 1
  };
  
  static int wm8770_probe(struct snd_soc_codec *codec)
  {
  	struct wm8770_priv *wm8770;
  	int ret;
  
  	wm8770 = snd_soc_codec_get_drvdata(codec);
  	wm8770->codec = codec;
  
  	ret = regulator_bulk_enable(ARRAY_SIZE(wm8770->supplies),
  				    wm8770->supplies);
  	if (ret) {
  		dev_err(codec->dev, "Failed to enable supplies: %d\n", ret);
  		return ret;
  	}
  
  	ret = wm8770_reset(codec);
  	if (ret < 0) {
  		dev_err(codec->dev, "Failed to issue reset: %d\n", ret);
  		goto err_reg_enable;
  	}
  
  	/* latch the volume update bits */
  	snd_soc_update_bits(codec, WM8770_MSDIGVOL, 0x100, 0x100);
  	snd_soc_update_bits(codec, WM8770_MSALGVOL, 0x100, 0x100);
  	snd_soc_update_bits(codec, WM8770_VOUT1RVOL, 0x100, 0x100);
  	snd_soc_update_bits(codec, WM8770_VOUT2RVOL, 0x100, 0x100);
  	snd_soc_update_bits(codec, WM8770_VOUT3RVOL, 0x100, 0x100);
  	snd_soc_update_bits(codec, WM8770_VOUT4RVOL, 0x100, 0x100);
  	snd_soc_update_bits(codec, WM8770_DAC1RVOL, 0x100, 0x100);
  	snd_soc_update_bits(codec, WM8770_DAC2RVOL, 0x100, 0x100);
  	snd_soc_update_bits(codec, WM8770_DAC3RVOL, 0x100, 0x100);
  	snd_soc_update_bits(codec, WM8770_DAC4RVOL, 0x100, 0x100);
  
  	/* mute all DACs */
  	snd_soc_update_bits(codec, WM8770_DACMUTE, 0x10, 0x10);
  
  err_reg_enable:
  	regulator_bulk_disable(ARRAY_SIZE(wm8770->supplies), wm8770->supplies);
  	return ret;
  }
  
  static struct snd_soc_codec_driver soc_codec_dev_wm8770 = {
  	.probe = wm8770_probe,
  	.set_bias_level = wm8770_set_bias_level,
  	.idle_bias_off = true,
  
  	.controls = wm8770_snd_controls,
  	.num_controls = ARRAY_SIZE(wm8770_snd_controls),
  	.dapm_widgets = wm8770_dapm_widgets,
  	.num_dapm_widgets = ARRAY_SIZE(wm8770_dapm_widgets),
  	.dapm_routes = wm8770_intercon,
  	.num_dapm_routes = ARRAY_SIZE(wm8770_intercon),
  };
  
  static const struct of_device_id wm8770_of_match[] = {
  	{ .compatible = "wlf,wm8770", },
  	{ }
  };
  MODULE_DEVICE_TABLE(of, wm8770_of_match);
  
  static const struct regmap_config wm8770_regmap = {
  	.reg_bits = 7,
  	.val_bits = 9,
  	.max_register = WM8770_RESET,
  
  	.reg_defaults = wm8770_reg_defaults,
  	.num_reg_defaults = ARRAY_SIZE(wm8770_reg_defaults),
  	.cache_type = REGCACHE_RBTREE,
  
  	.volatile_reg = wm8770_volatile_reg,
  };
  
  static int wm8770_spi_probe(struct spi_device *spi)
  {
  	struct wm8770_priv *wm8770;
  	int ret, i;
  
  	wm8770 = devm_kzalloc(&spi->dev, sizeof(struct wm8770_priv),
  			      GFP_KERNEL);
  	if (!wm8770)
  		return -ENOMEM;
  
  	for (i = 0; i < ARRAY_SIZE(wm8770->supplies); i++)
  		wm8770->supplies[i].supply = wm8770_supply_names[i];
  
  	ret = devm_regulator_bulk_get(&spi->dev, ARRAY_SIZE(wm8770->supplies),
  				      wm8770->supplies);
  	if (ret) {
  		dev_err(&spi->dev, "Failed to request supplies: %d\n", ret);
  		return ret;
  	}
  
  	wm8770->disable_nb[0].notifier_call = wm8770_regulator_event_0;
  	wm8770->disable_nb[1].notifier_call = wm8770_regulator_event_1;
  	wm8770->disable_nb[2].notifier_call = wm8770_regulator_event_2;
  
  	/* This should really be moved into the regulator core */
  	for (i = 0; i < ARRAY_SIZE(wm8770->supplies); i++) {
  		ret = regulator_register_notifier(wm8770->supplies[i].consumer,
  						  &wm8770->disable_nb[i]);
  		if (ret) {
  			dev_err(&spi->dev,
  				"Failed to register regulator notifier: %d\n",
  				ret);
  		}
  	}
  
  	wm8770->regmap = devm_regmap_init_spi(spi, &wm8770_regmap);
  	if (IS_ERR(wm8770->regmap))
  		return PTR_ERR(wm8770->regmap);
  
  	spi_set_drvdata(spi, wm8770);
  
  	ret = snd_soc_register_codec(&spi->dev,
  				     &soc_codec_dev_wm8770, &wm8770_dai, 1);
  
  	return ret;
  }
  
  static int wm8770_spi_remove(struct spi_device *spi)
  {
  	struct wm8770_priv *wm8770 = spi_get_drvdata(spi);
  	int i;
  
  	for (i = 0; i < ARRAY_SIZE(wm8770->supplies); ++i)
  		regulator_unregister_notifier(wm8770->supplies[i].consumer,
  					      &wm8770->disable_nb[i]);
  
  	snd_soc_unregister_codec(&spi->dev);
  
  	return 0;
  }
  
  static struct spi_driver wm8770_spi_driver = {
  	.driver = {
  		.name = "wm8770",
  		.owner = THIS_MODULE,
  		.of_match_table = wm8770_of_match,
  	},
  	.probe = wm8770_spi_probe,
  	.remove = wm8770_spi_remove
  };
  
  module_spi_driver(wm8770_spi_driver);
  
  MODULE_DESCRIPTION("ASoC WM8770 driver");
  MODULE_AUTHOR("Dimitris Papastamos <dp@opensource.wolfsonmicro.com>");
  MODULE_LICENSE("GPL");
  