sound/soc/codecs/wm8974.c - kernel/msm-4.19 - Gitiles

 /*
  * wm8974.c  --  WM8974 ALSA Soc Audio driver
  *
  * Copyright 2006-2009 Wolfson Microelectronics PLC.
  *
  * Author: Liam Girdwood <Liam.Girdwood@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/kernel.h>
 #include <linux/init.h>
 #include <linux/delay.h>
 #include <linux/pm.h>
 #include <linux/i2c.h>
 #include <linux/regmap.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 "wm8974.h"

 static const struct reg_default wm8974_reg_defaults[] = {
 	{  0, 0x0000 }, {  1, 0x0000 }, {  2, 0x0000 }, {  3, 0x0000 },
 	{  4, 0x0050 }, {  5, 0x0000 }, {  6, 0x0140 }, {  7, 0x0000 },
 	{  8, 0x0000 }, {  9, 0x0000 }, { 10, 0x0000 }, { 11, 0x00ff },
 	{ 12, 0x0000 }, { 13, 0x0000 }, { 14, 0x0100 }, { 15, 0x00ff },
 	{ 16, 0x0000 }, { 17, 0x0000 }, { 18, 0x012c }, { 19, 0x002c },
 	{ 20, 0x002c }, { 21, 0x002c }, { 22, 0x002c }, { 23, 0x0000 },
 	{ 24, 0x0032 }, { 25, 0x0000 }, { 26, 0x0000 }, { 27, 0x0000 },
 	{ 28, 0x0000 }, { 29, 0x0000 }, { 30, 0x0000 }, { 31, 0x0000 },
 	{ 32, 0x0038 }, { 33, 0x000b }, { 34, 0x0032 }, { 35, 0x0000 },
 	{ 36, 0x0008 }, { 37, 0x000c }, { 38, 0x0093 }, { 39, 0x00e9 },
 	{ 40, 0x0000 }, { 41, 0x0000 }, { 42, 0x0000 }, { 43, 0x0000 },
 	{ 44, 0x0003 }, { 45, 0x0010 }, { 46, 0x0000 }, { 47, 0x0000 },
 	{ 48, 0x0000 }, { 49, 0x0002 }, { 50, 0x0000 }, { 51, 0x0000 },
 	{ 52, 0x0000 }, { 53, 0x0000 }, { 54, 0x0039 }, { 55, 0x0000 },
 	{ 56, 0x0000 },
 };

 #define WM8974_POWER1_BIASEN  0x08
 #define WM8974_POWER1_BUFIOEN 0x04

 #define wm8974_reset(c)	snd_soc_write(c, WM8974_RESET, 0)

 static const char *wm8974_companding[] = {"Off", "NC", "u-law", "A-law" };
 static const char *wm8974_deemp[] = {"None", "32kHz", "44.1kHz", "48kHz" };
 static const char *wm8974_eqmode[] = {"Capture", "Playback" };
 static const char *wm8974_bw[] = {"Narrow", "Wide" };
 static const char *wm8974_eq1[] = {"80Hz", "105Hz", "135Hz", "175Hz" };
 static const char *wm8974_eq2[] = {"230Hz", "300Hz", "385Hz", "500Hz" };
 static const char *wm8974_eq3[] = {"650Hz", "850Hz", "1.1kHz", "1.4kHz" };
 static const char *wm8974_eq4[] = {"1.8kHz", "2.4kHz", "3.2kHz", "4.1kHz" };
 static const char *wm8974_eq5[] = {"5.3kHz", "6.9kHz", "9kHz", "11.7kHz" };
 static const char *wm8974_alc[] = {"ALC", "Limiter" };

 static const struct soc_enum wm8974_enum[] = {
 	SOC_ENUM_SINGLE(WM8974_COMP, 1, 4, wm8974_companding), /* adc */
 	SOC_ENUM_SINGLE(WM8974_COMP, 3, 4, wm8974_companding), /* dac */
 	SOC_ENUM_SINGLE(WM8974_DAC,  4, 4, wm8974_deemp),
 	SOC_ENUM_SINGLE(WM8974_EQ1,  8, 2, wm8974_eqmode),

 	SOC_ENUM_SINGLE(WM8974_EQ1,  5, 4, wm8974_eq1),
 	SOC_ENUM_SINGLE(WM8974_EQ2,  8, 2, wm8974_bw),
 	SOC_ENUM_SINGLE(WM8974_EQ2,  5, 4, wm8974_eq2),
 	SOC_ENUM_SINGLE(WM8974_EQ3,  8, 2, wm8974_bw),

 	SOC_ENUM_SINGLE(WM8974_EQ3,  5, 4, wm8974_eq3),
 	SOC_ENUM_SINGLE(WM8974_EQ4,  8, 2, wm8974_bw),
 	SOC_ENUM_SINGLE(WM8974_EQ4,  5, 4, wm8974_eq4),
 	SOC_ENUM_SINGLE(WM8974_EQ5,  8, 2, wm8974_bw),

 	SOC_ENUM_SINGLE(WM8974_EQ5,  5, 4, wm8974_eq5),
 	SOC_ENUM_SINGLE(WM8974_ALC3,  8, 2, wm8974_alc),
 };

 static const char *wm8974_auxmode_text[] = { "Buffer", "Mixer" };

 static SOC_ENUM_SINGLE_DECL(wm8974_auxmode,
 			    WM8974_INPUT,  3, wm8974_auxmode_text);

 static const DECLARE_TLV_DB_SCALE(digital_tlv, -12750, 50, 1);
 static const DECLARE_TLV_DB_SCALE(eq_tlv, -1200, 100, 0);
 static const DECLARE_TLV_DB_SCALE(inpga_tlv, -1200, 75, 0);
 static const DECLARE_TLV_DB_SCALE(spk_tlv, -5700, 100, 0);

 static const struct snd_kcontrol_new wm8974_snd_controls[] = {

 SOC_SINGLE("Digital Loopback Switch", WM8974_COMP, 0, 1, 0),

 SOC_ENUM("DAC Companding", wm8974_enum[1]),
 SOC_ENUM("ADC Companding", wm8974_enum[0]),

 SOC_ENUM("Playback De-emphasis", wm8974_enum[2]),
 SOC_SINGLE("DAC Inversion Switch", WM8974_DAC, 0, 1, 0),

 SOC_SINGLE_TLV("PCM Volume", WM8974_DACVOL, 0, 255, 0, digital_tlv),

 SOC_SINGLE("High Pass Filter Switch", WM8974_ADC, 8, 1, 0),
 SOC_SINGLE("High Pass Cut Off", WM8974_ADC, 4, 7, 0),
 SOC_SINGLE("ADC Inversion Switch", WM8974_ADC, 0, 1, 0),

 SOC_SINGLE_TLV("Capture Volume", WM8974_ADCVOL,  0, 255, 0, digital_tlv),

 SOC_ENUM("Equaliser Function", wm8974_enum[3]),
 SOC_ENUM("EQ1 Cut Off", wm8974_enum[4]),
 SOC_SINGLE_TLV("EQ1 Volume", WM8974_EQ1,  0, 24, 1, eq_tlv),

 SOC_ENUM("Equaliser EQ2 Bandwidth", wm8974_enum[5]),
 SOC_ENUM("EQ2 Cut Off", wm8974_enum[6]),
 SOC_SINGLE_TLV("EQ2 Volume", WM8974_EQ2,  0, 24, 1, eq_tlv),

 SOC_ENUM("Equaliser EQ3 Bandwidth", wm8974_enum[7]),
 SOC_ENUM("EQ3 Cut Off", wm8974_enum[8]),
 SOC_SINGLE_TLV("EQ3 Volume", WM8974_EQ3,  0, 24, 1, eq_tlv),

 SOC_ENUM("Equaliser EQ4 Bandwidth", wm8974_enum[9]),
 SOC_ENUM("EQ4 Cut Off", wm8974_enum[10]),
 SOC_SINGLE_TLV("EQ4 Volume", WM8974_EQ4,  0, 24, 1, eq_tlv),

 SOC_ENUM("Equaliser EQ5 Bandwidth", wm8974_enum[11]),
 SOC_ENUM("EQ5 Cut Off", wm8974_enum[12]),
 SOC_SINGLE_TLV("EQ5 Volume", WM8974_EQ5,  0, 24, 1, eq_tlv),

 SOC_SINGLE("DAC Playback Limiter Switch", WM8974_DACLIM1,  8, 1, 0),
 SOC_SINGLE("DAC Playback Limiter Decay", WM8974_DACLIM1,  4, 15, 0),
 SOC_SINGLE("DAC Playback Limiter Attack", WM8974_DACLIM1,  0, 15, 0),

 SOC_SINGLE("DAC Playback Limiter Threshold", WM8974_DACLIM2,  4, 7, 0),
 SOC_SINGLE("DAC Playback Limiter Boost", WM8974_DACLIM2,  0, 15, 0),

 SOC_SINGLE("ALC Enable Switch", WM8974_ALC1,  8, 1, 0),
 SOC_SINGLE("ALC Capture Max Gain", WM8974_ALC1,  3, 7, 0),
 SOC_SINGLE("ALC Capture Min Gain", WM8974_ALC1,  0, 7, 0),

 SOC_SINGLE("ALC Capture ZC Switch", WM8974_ALC2,  8, 1, 0),
 SOC_SINGLE("ALC Capture Hold", WM8974_ALC2,  4, 7, 0),
 SOC_SINGLE("ALC Capture Target", WM8974_ALC2,  0, 15, 0),

 SOC_ENUM("ALC Capture Mode", wm8974_enum[13]),
 SOC_SINGLE("ALC Capture Decay", WM8974_ALC3,  4, 15, 0),
 SOC_SINGLE("ALC Capture Attack", WM8974_ALC3,  0, 15, 0),

 SOC_SINGLE("ALC Capture Noise Gate Switch", WM8974_NGATE,  3, 1, 0),
 SOC_SINGLE("ALC Capture Noise Gate Threshold", WM8974_NGATE,  0, 7, 0),

 SOC_SINGLE("Capture PGA ZC Switch", WM8974_INPPGA,  7, 1, 0),
 SOC_SINGLE_TLV("Capture PGA Volume", WM8974_INPPGA,  0, 63, 0, inpga_tlv),

 SOC_SINGLE("Speaker Playback ZC Switch", WM8974_SPKVOL,  7, 1, 0),
 SOC_SINGLE("Speaker Playback Switch", WM8974_SPKVOL,  6, 1, 1),
 SOC_SINGLE_TLV("Speaker Playback Volume", WM8974_SPKVOL,  0, 63, 0, spk_tlv),

 SOC_ENUM("Aux Mode", wm8974_auxmode),

 SOC_SINGLE("Capture Boost(+20dB)", WM8974_ADCBOOST,  8, 1, 0),
 SOC_SINGLE("Mono Playback Switch", WM8974_MONOMIX, 6, 1, 1),

 /* DAC / ADC oversampling */
 SOC_SINGLE("DAC 128x Oversampling Switch", WM8974_DAC, 8, 1, 0),
 SOC_SINGLE("ADC 128x Oversampling Switch", WM8974_ADC, 8, 1, 0),
 };

 /* Speaker Output Mixer */
 static const struct snd_kcontrol_new wm8974_speaker_mixer_controls[] = {
 SOC_DAPM_SINGLE("Line Bypass Switch", WM8974_SPKMIX, 1, 1, 0),
 SOC_DAPM_SINGLE("Aux Playback Switch", WM8974_SPKMIX, 5, 1, 0),
 SOC_DAPM_SINGLE("PCM Playback Switch", WM8974_SPKMIX, 0, 1, 0),
 };

 /* Mono Output Mixer */
 static const struct snd_kcontrol_new wm8974_mono_mixer_controls[] = {
 SOC_DAPM_SINGLE("Line Bypass Switch", WM8974_MONOMIX, 1, 1, 0),
 SOC_DAPM_SINGLE("Aux Playback Switch", WM8974_MONOMIX, 2, 1, 0),
 SOC_DAPM_SINGLE("PCM Playback Switch", WM8974_MONOMIX, 0, 1, 0),
 };

 /* Boost mixer */
 static const struct snd_kcontrol_new wm8974_boost_mixer[] = {
 SOC_DAPM_SINGLE("Aux Switch", WM8974_INPPGA, 6, 1, 0),
 };

 /* Input PGA */
 static const struct snd_kcontrol_new wm8974_inpga[] = {
 SOC_DAPM_SINGLE("Aux Switch", WM8974_INPUT, 2, 1, 0),
 SOC_DAPM_SINGLE("MicN Switch", WM8974_INPUT, 1, 1, 0),
 SOC_DAPM_SINGLE("MicP Switch", WM8974_INPUT, 0, 1, 0),
 };

 /* AUX Input boost vol */
 static const struct snd_kcontrol_new wm8974_aux_boost_controls =
 SOC_DAPM_SINGLE("Aux Volume", WM8974_ADCBOOST, 0, 7, 0);

 /* Mic Input boost vol */
 static const struct snd_kcontrol_new wm8974_mic_boost_controls =
 SOC_DAPM_SINGLE("Mic Volume", WM8974_ADCBOOST, 4, 7, 0);

 static const struct snd_soc_dapm_widget wm8974_dapm_widgets[] = {
 SND_SOC_DAPM_MIXER("Speaker Mixer", WM8974_POWER3, 2, 0,
 	&wm8974_speaker_mixer_controls[0],
 	ARRAY_SIZE(wm8974_speaker_mixer_controls)),
 SND_SOC_DAPM_MIXER("Mono Mixer", WM8974_POWER3, 3, 0,
 	&wm8974_mono_mixer_controls[0],
 	ARRAY_SIZE(wm8974_mono_mixer_controls)),
 SND_SOC_DAPM_DAC("DAC", "HiFi Playback", WM8974_POWER3, 0, 0),
 SND_SOC_DAPM_ADC("ADC", "HiFi Capture", WM8974_POWER2, 0, 0),
 SND_SOC_DAPM_PGA("Aux Input", WM8974_POWER1, 6, 0, NULL, 0),
 SND_SOC_DAPM_PGA("SpkN Out", WM8974_POWER3, 5, 0, NULL, 0),
 SND_SOC_DAPM_PGA("SpkP Out", WM8974_POWER3, 6, 0, NULL, 0),
 SND_SOC_DAPM_PGA("Mono Out", WM8974_POWER3, 7, 0, NULL, 0),

 SND_SOC_DAPM_MIXER("Input PGA", WM8974_POWER2, 2, 0, wm8974_inpga,
 		   ARRAY_SIZE(wm8974_inpga)),
 SND_SOC_DAPM_MIXER("Boost Mixer", WM8974_POWER2, 4, 0,
 		   wm8974_boost_mixer, ARRAY_SIZE(wm8974_boost_mixer)),

 SND_SOC_DAPM_SUPPLY("Mic Bias", WM8974_POWER1, 4, 0, NULL, 0),

 SND_SOC_DAPM_INPUT("MICN"),
 SND_SOC_DAPM_INPUT("MICP"),
 SND_SOC_DAPM_INPUT("AUX"),
 SND_SOC_DAPM_OUTPUT("MONOOUT"),
 SND_SOC_DAPM_OUTPUT("SPKOUTP"),
 SND_SOC_DAPM_OUTPUT("SPKOUTN"),
 };

 static const struct snd_soc_dapm_route wm8974_dapm_routes[] = {
 	/* Mono output mixer */
 	{"Mono Mixer", "PCM Playback Switch", "DAC"},
 	{"Mono Mixer", "Aux Playback Switch", "Aux Input"},
 	{"Mono Mixer", "Line Bypass Switch", "Boost Mixer"},

 	/* Speaker output mixer */
 	{"Speaker Mixer", "PCM Playback Switch", "DAC"},
 	{"Speaker Mixer", "Aux Playback Switch", "Aux Input"},
 	{"Speaker Mixer", "Line Bypass Switch", "Boost Mixer"},

 	/* Outputs */
 	{"Mono Out", NULL, "Mono Mixer"},
 	{"MONOOUT", NULL, "Mono Out"},
 	{"SpkN Out", NULL, "Speaker Mixer"},
 	{"SpkP Out", NULL, "Speaker Mixer"},
 	{"SPKOUTN", NULL, "SpkN Out"},
 	{"SPKOUTP", NULL, "SpkP Out"},

 	/* Boost Mixer */
 	{"ADC", NULL, "Boost Mixer"},
 	{"Boost Mixer", "Aux Switch", "Aux Input"},
 	{"Boost Mixer", NULL, "Input PGA"},
 	{"Boost Mixer", NULL, "MICP"},

 	/* Input PGA */
 	{"Input PGA", "Aux Switch", "Aux Input"},
 	{"Input PGA", "MicN Switch", "MICN"},
 	{"Input PGA", "MicP Switch", "MICP"},

 	/* Inputs */
 	{"Aux Input", NULL, "AUX"},
 };

 struct pll_ {
 	unsigned int pre_div:1;
 	unsigned int n:4;
 	unsigned int k;
 };

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

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

 	/* There is a fixed divide by 4 in the output path */
 	target *= 4;

 	Ndiv = target / source;
 	if (Ndiv < 6) {
 		source /= 2;
 		pll_div->pre_div = 1;
 		Ndiv = target / source;
 	} else
 		pll_div->pre_div = 0;

 	if ((Ndiv < 6) || (Ndiv > 12))
 		printk(KERN_WARNING
 			"WM8974 N value %u outwith recommended range!\n",
 			Ndiv);

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

 	do_div(Kpart, source);

 	K = Kpart & 0xFFFFFFFF;

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

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

 	pll_div->k = K;
 }

 static int wm8974_set_dai_pll(struct snd_soc_dai *codec_dai, int pll_id,
 		int source, unsigned int freq_in, unsigned int freq_out)
 {
 	struct snd_soc_codec *codec = codec_dai->codec;
 	struct pll_ pll_div;
 	u16 reg;

 	if (freq_in == 0 || freq_out == 0) {
 		/* Clock CODEC directly from MCLK */
 		reg = snd_soc_read(codec, WM8974_CLOCK);
 		snd_soc_write(codec, WM8974_CLOCK, reg & 0x0ff);

 		/* Turn off PLL */
 		reg = snd_soc_read(codec, WM8974_POWER1);
 		snd_soc_write(codec, WM8974_POWER1, reg & 0x1df);
 		return 0;
 	}

 	pll_factors(&pll_div, freq_out, freq_in);

 	snd_soc_write(codec, WM8974_PLLN, (pll_div.pre_div << 4) | pll_div.n);
 	snd_soc_write(codec, WM8974_PLLK1, pll_div.k >> 18);
 	snd_soc_write(codec, WM8974_PLLK2, (pll_div.k >> 9) & 0x1ff);
 	snd_soc_write(codec, WM8974_PLLK3, pll_div.k & 0x1ff);
 	reg = snd_soc_read(codec, WM8974_POWER1);
 	snd_soc_write(codec, WM8974_POWER1, reg | 0x020);

 	/* Run CODEC from PLL instead of MCLK */
 	reg = snd_soc_read(codec, WM8974_CLOCK);
 	snd_soc_write(codec, WM8974_CLOCK, reg | 0x100);

 	return 0;
 }

 /*
  * Configure WM8974 clock dividers.
  */
 static int wm8974_set_dai_clkdiv(struct snd_soc_dai *codec_dai,
 		int div_id, int div)
 {
 	struct snd_soc_codec *codec = codec_dai->codec;
 	u16 reg;

 	switch (div_id) {
 	case WM8974_OPCLKDIV:
 		reg = snd_soc_read(codec, WM8974_GPIO) & 0x1cf;
 		snd_soc_write(codec, WM8974_GPIO, reg | div);
 		break;
 	case WM8974_MCLKDIV:
 		reg = snd_soc_read(codec, WM8974_CLOCK) & 0x11f;
 		snd_soc_write(codec, WM8974_CLOCK, reg | div);
 		break;
 	case WM8974_BCLKDIV:
 		reg = snd_soc_read(codec, WM8974_CLOCK) & 0x1e3;
 		snd_soc_write(codec, WM8974_CLOCK, reg | div);
 		break;
 	default:
 		return -EINVAL;
 	}

 	return 0;
 }

 static int wm8974_set_dai_fmt(struct snd_soc_dai *codec_dai,
 		unsigned int fmt)
 {
 	struct snd_soc_codec *codec = codec_dai->codec;
 	u16 iface = 0;
 	u16 clk = snd_soc_read(codec, WM8974_CLOCK) & 0x1fe;

 	/* set master/slave audio interface */
 	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 	case SND_SOC_DAIFMT_CBM_CFM:
 		clk |= 0x0001;
 		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 |= 0x0010;
 		break;
 	case SND_SOC_DAIFMT_RIGHT_J:
 		break;
 	case SND_SOC_DAIFMT_LEFT_J:
 		iface |= 0x0008;
 		break;
 	case SND_SOC_DAIFMT_DSP_A:
 		iface |= 0x00018;
 		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 |= 0x0180;
 		break;
 	case SND_SOC_DAIFMT_IB_NF:
 		iface |= 0x0100;
 		break;
 	case SND_SOC_DAIFMT_NB_IF:
 		iface |= 0x0080;
 		break;
 	default:
 		return -EINVAL;
 	}

 	snd_soc_write(codec, WM8974_IFACE, iface);
 	snd_soc_write(codec, WM8974_CLOCK, clk);
 	return 0;
 }

 static int wm8974_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;
 	u16 iface = snd_soc_read(codec, WM8974_IFACE) & 0x19f;
 	u16 adn = snd_soc_read(codec, WM8974_ADD) & 0x1f1;

 	/* bit size */
 	switch (params_width(params)) {
 	case 16:
 		break;
 	case 20:
 		iface |= 0x0020;
 		break;
 	case 24:
 		iface |= 0x0040;
 		break;
 	case 32:
 		iface |= 0x0060;
 		break;
 	}

 	/* filter coefficient */
 	switch (params_rate(params)) {
 	case 8000:
 		adn |= 0x5 << 1;
 		break;
 	case 11025:
 		adn |= 0x4 << 1;
 		break;
 	case 16000:
 		adn |= 0x3 << 1;
 		break;
 	case 22050:
 		adn |= 0x2 << 1;
 		break;
 	case 32000:
 		adn |= 0x1 << 1;
 		break;
 	case 44100:
 	case 48000:
 		break;
 	}

 	snd_soc_write(codec, WM8974_IFACE, iface);
 	snd_soc_write(codec, WM8974_ADD, adn);
 	return 0;
 }

 static int wm8974_mute(struct snd_soc_dai *dai, int mute)
 {
 	struct snd_soc_codec *codec = dai->codec;
 	u16 mute_reg = snd_soc_read(codec, WM8974_DAC) & 0xffbf;

 	if (mute)
 		snd_soc_write(codec, WM8974_DAC, mute_reg | 0x40);
 	else
 		snd_soc_write(codec, WM8974_DAC, mute_reg);
 	return 0;
 }

 /* liam need to make this lower power with dapm */
 static int wm8974_set_bias_level(struct snd_soc_codec *codec,
 	enum snd_soc_bias_level level)
 {
 	u16 power1 = snd_soc_read(codec, WM8974_POWER1) & ~0x3;

 	switch (level) {
 	case SND_SOC_BIAS_ON:
 	case SND_SOC_BIAS_PREPARE:
 		power1 |= 0x1;  /* VMID 50k */
 		snd_soc_write(codec, WM8974_POWER1, power1);
 		break;

 	case SND_SOC_BIAS_STANDBY:
 		power1 |= WM8974_POWER1_BIASEN | WM8974_POWER1_BUFIOEN;

 		if (codec->dapm.bias_level == SND_SOC_BIAS_OFF) {
 			regcache_sync(dev_get_regmap(codec->dev, NULL));

 			/* Initial cap charge at VMID 5k */
 			snd_soc_write(codec, WM8974_POWER1, power1 | 0x3);
 			mdelay(100);
 		}

 		power1 |= 0x2;  /* VMID 500k */
 		snd_soc_write(codec, WM8974_POWER1, power1);
 		break;

 	case SND_SOC_BIAS_OFF:
 		snd_soc_write(codec, WM8974_POWER1, 0);
 		snd_soc_write(codec, WM8974_POWER2, 0);
 		snd_soc_write(codec, WM8974_POWER3, 0);
 		break;
 	}

 	codec->dapm.bias_level = level;
 	return 0;
 }

 #define WM8974_RATES (SNDRV_PCM_RATE_8000_48000)

 #define WM8974_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
 	SNDRV_PCM_FMTBIT_S24_LE)

 static const struct snd_soc_dai_ops wm8974_ops = {
 	.hw_params = wm8974_pcm_hw_params,
 	.digital_mute = wm8974_mute,
 	.set_fmt = wm8974_set_dai_fmt,
 	.set_clkdiv = wm8974_set_dai_clkdiv,
 	.set_pll = wm8974_set_dai_pll,
 };

 static struct snd_soc_dai_driver wm8974_dai = {
 	.name = "wm8974-hifi",
 	.playback = {
 		.stream_name = "Playback",
 		.channels_min = 1,
 		.channels_max = 2,   /* Only 1 channel of data */
 		.rates = WM8974_RATES,
 		.formats = WM8974_FORMATS,},
 	.capture = {
 		.stream_name = "Capture",
 		.channels_min = 1,
 		.channels_max = 2,   /* Only 1 channel of data */
 		.rates = WM8974_RATES,
 		.formats = WM8974_FORMATS,},
 	.ops = &wm8974_ops,
 	.symmetric_rates = 1,
 };

 static const struct regmap_config wm8974_regmap = {
 	.reg_bits = 7,
 	.val_bits = 9,

 	.max_register = WM8974_MONOMIX,
 	.reg_defaults = wm8974_reg_defaults,
 	.num_reg_defaults = ARRAY_SIZE(wm8974_reg_defaults),
 };

 static int wm8974_probe(struct snd_soc_codec *codec)
 {
 	int ret = 0;

 	ret = wm8974_reset(codec);
 	if (ret < 0) {
 		dev_err(codec->dev, "Failed to issue reset\n");
 		return ret;
 	}

 	return 0;
 }

 static struct snd_soc_codec_driver soc_codec_dev_wm8974 = {
 	.probe = 	wm8974_probe,
 	.set_bias_level = wm8974_set_bias_level,
 	.suspend_bias_off = true,

 	.controls = wm8974_snd_controls,
 	.num_controls = ARRAY_SIZE(wm8974_snd_controls),
 	.dapm_widgets = wm8974_dapm_widgets,
 	.num_dapm_widgets = ARRAY_SIZE(wm8974_dapm_widgets),
 	.dapm_routes = wm8974_dapm_routes,
 	.num_dapm_routes = ARRAY_SIZE(wm8974_dapm_routes),
 };

 static int wm8974_i2c_probe(struct i2c_client *i2c,
 			    const struct i2c_device_id *id)
 {
 	struct regmap *regmap;
 	int ret;

 	regmap = devm_regmap_init_i2c(i2c, &wm8974_regmap);
 	if (IS_ERR(regmap))
 		return PTR_ERR(regmap);

 	ret = snd_soc_register_codec(&i2c->dev,
 			&soc_codec_dev_wm8974, &wm8974_dai, 1);

 	return ret;
 }

 static int wm8974_i2c_remove(struct i2c_client *client)
 {
 	snd_soc_unregister_codec(&client->dev);

 	return 0;
 }

 static const struct i2c_device_id wm8974_i2c_id[] = {
 	{ "wm8974", 0 },
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, wm8974_i2c_id);

 static struct i2c_driver wm8974_i2c_driver = {
 	.driver = {
 		.name = "wm8974",
 		.owner = THIS_MODULE,
 	},
 	.probe =    wm8974_i2c_probe,
 	.remove =   wm8974_i2c_remove,
 	.id_table = wm8974_i2c_id,
 };

 module_i2c_driver(wm8974_i2c_driver);

 MODULE_DESCRIPTION("ASoC WM8974 driver");
 MODULE_AUTHOR("Liam Girdwood");
 MODULE_LICENSE("GPL");
	/*
	* wm8974.c -- WM8974 ALSA Soc Audio driver
	*
	* Copyright 2006-2009 Wolfson Microelectronics PLC.
	*
	* Author: Liam Girdwood <Liam.Girdwood@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/kernel.h>
	#include <linux/init.h>
	#include <linux/delay.h>
	#include <linux/pm.h>
	#include <linux/i2c.h>
	#include <linux/regmap.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 "wm8974.h"

	static const struct reg_default wm8974_reg_defaults[] = {
	{ 0, 0x0000 }, { 1, 0x0000 }, { 2, 0x0000 }, { 3, 0x0000 },
	{ 4, 0x0050 }, { 5, 0x0000 }, { 6, 0x0140 }, { 7, 0x0000 },
	{ 8, 0x0000 }, { 9, 0x0000 }, { 10, 0x0000 }, { 11, 0x00ff },
	{ 12, 0x0000 }, { 13, 0x0000 }, { 14, 0x0100 }, { 15, 0x00ff },
	{ 16, 0x0000 }, { 17, 0x0000 }, { 18, 0x012c }, { 19, 0x002c },
	{ 20, 0x002c }, { 21, 0x002c }, { 22, 0x002c }, { 23, 0x0000 },
	{ 24, 0x0032 }, { 25, 0x0000 }, { 26, 0x0000 }, { 27, 0x0000 },
	{ 28, 0x0000 }, { 29, 0x0000 }, { 30, 0x0000 }, { 31, 0x0000 },
	{ 32, 0x0038 }, { 33, 0x000b }, { 34, 0x0032 }, { 35, 0x0000 },
	{ 36, 0x0008 }, { 37, 0x000c }, { 38, 0x0093 }, { 39, 0x00e9 },
	{ 40, 0x0000 }, { 41, 0x0000 }, { 42, 0x0000 }, { 43, 0x0000 },
	{ 44, 0x0003 }, { 45, 0x0010 }, { 46, 0x0000 }, { 47, 0x0000 },
	{ 48, 0x0000 }, { 49, 0x0002 }, { 50, 0x0000 }, { 51, 0x0000 },
	{ 52, 0x0000 }, { 53, 0x0000 }, { 54, 0x0039 }, { 55, 0x0000 },
	{ 56, 0x0000 },
	};

	#define WM8974_POWER1_BIASEN 0x08
	#define WM8974_POWER1_BUFIOEN 0x04

	#define wm8974_reset(c) snd_soc_write(c, WM8974_RESET, 0)

	static const char *wm8974_companding[] = {"Off", "NC", "u-law", "A-law" };
	static const char *wm8974_deemp[] = {"None", "32kHz", "44.1kHz", "48kHz" };
	static const char *wm8974_eqmode[] = {"Capture", "Playback" };
	static const char *wm8974_bw[] = {"Narrow", "Wide" };
	static const char *wm8974_eq1[] = {"80Hz", "105Hz", "135Hz", "175Hz" };
	static const char *wm8974_eq2[] = {"230Hz", "300Hz", "385Hz", "500Hz" };
	static const char *wm8974_eq3[] = {"650Hz", "850Hz", "1.1kHz", "1.4kHz" };
	static const char *wm8974_eq4[] = {"1.8kHz", "2.4kHz", "3.2kHz", "4.1kHz" };
	static const char *wm8974_eq5[] = {"5.3kHz", "6.9kHz", "9kHz", "11.7kHz" };
	static const char *wm8974_alc[] = {"ALC", "Limiter" };

	static const struct soc_enum wm8974_enum[] = {
	SOC_ENUM_SINGLE(WM8974_COMP, 1, 4, wm8974_companding), /* adc */
	SOC_ENUM_SINGLE(WM8974_COMP, 3, 4, wm8974_companding), /* dac */
	SOC_ENUM_SINGLE(WM8974_DAC, 4, 4, wm8974_deemp),
	SOC_ENUM_SINGLE(WM8974_EQ1, 8, 2, wm8974_eqmode),

	SOC_ENUM_SINGLE(WM8974_EQ1, 5, 4, wm8974_eq1),
	SOC_ENUM_SINGLE(WM8974_EQ2, 8, 2, wm8974_bw),
	SOC_ENUM_SINGLE(WM8974_EQ2, 5, 4, wm8974_eq2),
	SOC_ENUM_SINGLE(WM8974_EQ3, 8, 2, wm8974_bw),

	SOC_ENUM_SINGLE(WM8974_EQ3, 5, 4, wm8974_eq3),
	SOC_ENUM_SINGLE(WM8974_EQ4, 8, 2, wm8974_bw),
	SOC_ENUM_SINGLE(WM8974_EQ4, 5, 4, wm8974_eq4),
	SOC_ENUM_SINGLE(WM8974_EQ5, 8, 2, wm8974_bw),

	SOC_ENUM_SINGLE(WM8974_EQ5, 5, 4, wm8974_eq5),
	SOC_ENUM_SINGLE(WM8974_ALC3, 8, 2, wm8974_alc),
	};

	static const char *wm8974_auxmode_text[] = { "Buffer", "Mixer" };

	static SOC_ENUM_SINGLE_DECL(wm8974_auxmode,
	WM8974_INPUT, 3, wm8974_auxmode_text);

	static const DECLARE_TLV_DB_SCALE(digital_tlv, -12750, 50, 1);
	static const DECLARE_TLV_DB_SCALE(eq_tlv, -1200, 100, 0);
	static const DECLARE_TLV_DB_SCALE(inpga_tlv, -1200, 75, 0);
	static const DECLARE_TLV_DB_SCALE(spk_tlv, -5700, 100, 0);

	static const struct snd_kcontrol_new wm8974_snd_controls[] = {

	SOC_SINGLE("Digital Loopback Switch", WM8974_COMP, 0, 1, 0),

	SOC_ENUM("DAC Companding", wm8974_enum[1]),
	SOC_ENUM("ADC Companding", wm8974_enum[0]),

	SOC_ENUM("Playback De-emphasis", wm8974_enum[2]),
	SOC_SINGLE("DAC Inversion Switch", WM8974_DAC, 0, 1, 0),

	SOC_SINGLE_TLV("PCM Volume", WM8974_DACVOL, 0, 255, 0, digital_tlv),

	SOC_SINGLE("High Pass Filter Switch", WM8974_ADC, 8, 1, 0),
	SOC_SINGLE("High Pass Cut Off", WM8974_ADC, 4, 7, 0),
	SOC_SINGLE("ADC Inversion Switch", WM8974_ADC, 0, 1, 0),

	SOC_SINGLE_TLV("Capture Volume", WM8974_ADCVOL, 0, 255, 0, digital_tlv),

	SOC_ENUM("Equaliser Function", wm8974_enum[3]),
	SOC_ENUM("EQ1 Cut Off", wm8974_enum[4]),
	SOC_SINGLE_TLV("EQ1 Volume", WM8974_EQ1, 0, 24, 1, eq_tlv),

	SOC_ENUM("Equaliser EQ2 Bandwidth", wm8974_enum[5]),
	SOC_ENUM("EQ2 Cut Off", wm8974_enum[6]),
	SOC_SINGLE_TLV("EQ2 Volume", WM8974_EQ2, 0, 24, 1, eq_tlv),

	SOC_ENUM("Equaliser EQ3 Bandwidth", wm8974_enum[7]),
	SOC_ENUM("EQ3 Cut Off", wm8974_enum[8]),
	SOC_SINGLE_TLV("EQ3 Volume", WM8974_EQ3, 0, 24, 1, eq_tlv),

	SOC_ENUM("Equaliser EQ4 Bandwidth", wm8974_enum[9]),
	SOC_ENUM("EQ4 Cut Off", wm8974_enum[10]),
	SOC_SINGLE_TLV("EQ4 Volume", WM8974_EQ4, 0, 24, 1, eq_tlv),

	SOC_ENUM("Equaliser EQ5 Bandwidth", wm8974_enum[11]),
	SOC_ENUM("EQ5 Cut Off", wm8974_enum[12]),
	SOC_SINGLE_TLV("EQ5 Volume", WM8974_EQ5, 0, 24, 1, eq_tlv),

	SOC_SINGLE("DAC Playback Limiter Switch", WM8974_DACLIM1, 8, 1, 0),
	SOC_SINGLE("DAC Playback Limiter Decay", WM8974_DACLIM1, 4, 15, 0),
	SOC_SINGLE("DAC Playback Limiter Attack", WM8974_DACLIM1, 0, 15, 0),

	SOC_SINGLE("DAC Playback Limiter Threshold", WM8974_DACLIM2, 4, 7, 0),
	SOC_SINGLE("DAC Playback Limiter Boost", WM8974_DACLIM2, 0, 15, 0),

	SOC_SINGLE("ALC Enable Switch", WM8974_ALC1, 8, 1, 0),
	SOC_SINGLE("ALC Capture Max Gain", WM8974_ALC1, 3, 7, 0),
	SOC_SINGLE("ALC Capture Min Gain", WM8974_ALC1, 0, 7, 0),

	SOC_SINGLE("ALC Capture ZC Switch", WM8974_ALC2, 8, 1, 0),
	SOC_SINGLE("ALC Capture Hold", WM8974_ALC2, 4, 7, 0),
	SOC_SINGLE("ALC Capture Target", WM8974_ALC2, 0, 15, 0),

	SOC_ENUM("ALC Capture Mode", wm8974_enum[13]),
	SOC_SINGLE("ALC Capture Decay", WM8974_ALC3, 4, 15, 0),
	SOC_SINGLE("ALC Capture Attack", WM8974_ALC3, 0, 15, 0),

	SOC_SINGLE("ALC Capture Noise Gate Switch", WM8974_NGATE, 3, 1, 0),
	SOC_SINGLE("ALC Capture Noise Gate Threshold", WM8974_NGATE, 0, 7, 0),

	SOC_SINGLE("Capture PGA ZC Switch", WM8974_INPPGA, 7, 1, 0),
	SOC_SINGLE_TLV("Capture PGA Volume", WM8974_INPPGA, 0, 63, 0, inpga_tlv),

	SOC_SINGLE("Speaker Playback ZC Switch", WM8974_SPKVOL, 7, 1, 0),
	SOC_SINGLE("Speaker Playback Switch", WM8974_SPKVOL, 6, 1, 1),
	SOC_SINGLE_TLV("Speaker Playback Volume", WM8974_SPKVOL, 0, 63, 0, spk_tlv),

	SOC_ENUM("Aux Mode", wm8974_auxmode),

	SOC_SINGLE("Capture Boost(+20dB)", WM8974_ADCBOOST, 8, 1, 0),
	SOC_SINGLE("Mono Playback Switch", WM8974_MONOMIX, 6, 1, 1),

	/* DAC / ADC oversampling */
	SOC_SINGLE("DAC 128x Oversampling Switch", WM8974_DAC, 8, 1, 0),
	SOC_SINGLE("ADC 128x Oversampling Switch", WM8974_ADC, 8, 1, 0),
	};

	/* Speaker Output Mixer */
	static const struct snd_kcontrol_new wm8974_speaker_mixer_controls[] = {
	SOC_DAPM_SINGLE("Line Bypass Switch", WM8974_SPKMIX, 1, 1, 0),
	SOC_DAPM_SINGLE("Aux Playback Switch", WM8974_SPKMIX, 5, 1, 0),
	SOC_DAPM_SINGLE("PCM Playback Switch", WM8974_SPKMIX, 0, 1, 0),
	};

	/* Mono Output Mixer */
	static const struct snd_kcontrol_new wm8974_mono_mixer_controls[] = {
	SOC_DAPM_SINGLE("Line Bypass Switch", WM8974_MONOMIX, 1, 1, 0),
	SOC_DAPM_SINGLE("Aux Playback Switch", WM8974_MONOMIX, 2, 1, 0),
	SOC_DAPM_SINGLE("PCM Playback Switch", WM8974_MONOMIX, 0, 1, 0),
	};

	/* Boost mixer */
	static const struct snd_kcontrol_new wm8974_boost_mixer[] = {
	SOC_DAPM_SINGLE("Aux Switch", WM8974_INPPGA, 6, 1, 0),
	};

	/* Input PGA */
	static const struct snd_kcontrol_new wm8974_inpga[] = {
	SOC_DAPM_SINGLE("Aux Switch", WM8974_INPUT, 2, 1, 0),
	SOC_DAPM_SINGLE("MicN Switch", WM8974_INPUT, 1, 1, 0),
	SOC_DAPM_SINGLE("MicP Switch", WM8974_INPUT, 0, 1, 0),
	};

	/* AUX Input boost vol */
	static const struct snd_kcontrol_new wm8974_aux_boost_controls =
	SOC_DAPM_SINGLE("Aux Volume", WM8974_ADCBOOST, 0, 7, 0);

	/* Mic Input boost vol */
	static const struct snd_kcontrol_new wm8974_mic_boost_controls =
	SOC_DAPM_SINGLE("Mic Volume", WM8974_ADCBOOST, 4, 7, 0);

	static const struct snd_soc_dapm_widget wm8974_dapm_widgets[] = {
	SND_SOC_DAPM_MIXER("Speaker Mixer", WM8974_POWER3, 2, 0,
	&wm8974_speaker_mixer_controls[0],
	ARRAY_SIZE(wm8974_speaker_mixer_controls)),
	SND_SOC_DAPM_MIXER("Mono Mixer", WM8974_POWER3, 3, 0,
	&wm8974_mono_mixer_controls[0],
	ARRAY_SIZE(wm8974_mono_mixer_controls)),
	SND_SOC_DAPM_DAC("DAC", "HiFi Playback", WM8974_POWER3, 0, 0),
	SND_SOC_DAPM_ADC("ADC", "HiFi Capture", WM8974_POWER2, 0, 0),
	SND_SOC_DAPM_PGA("Aux Input", WM8974_POWER1, 6, 0, NULL, 0),
	SND_SOC_DAPM_PGA("SpkN Out", WM8974_POWER3, 5, 0, NULL, 0),
	SND_SOC_DAPM_PGA("SpkP Out", WM8974_POWER3, 6, 0, NULL, 0),
	SND_SOC_DAPM_PGA("Mono Out", WM8974_POWER3, 7, 0, NULL, 0),

	SND_SOC_DAPM_MIXER("Input PGA", WM8974_POWER2, 2, 0, wm8974_inpga,
	ARRAY_SIZE(wm8974_inpga)),
	SND_SOC_DAPM_MIXER("Boost Mixer", WM8974_POWER2, 4, 0,
	wm8974_boost_mixer, ARRAY_SIZE(wm8974_boost_mixer)),

	SND_SOC_DAPM_SUPPLY("Mic Bias", WM8974_POWER1, 4, 0, NULL, 0),

	SND_SOC_DAPM_INPUT("MICN"),
	SND_SOC_DAPM_INPUT("MICP"),
	SND_SOC_DAPM_INPUT("AUX"),
	SND_SOC_DAPM_OUTPUT("MONOOUT"),
	SND_SOC_DAPM_OUTPUT("SPKOUTP"),
	SND_SOC_DAPM_OUTPUT("SPKOUTN"),
	};

	static const struct snd_soc_dapm_route wm8974_dapm_routes[] = {
	/* Mono output mixer */
	{"Mono Mixer", "PCM Playback Switch", "DAC"},
	{"Mono Mixer", "Aux Playback Switch", "Aux Input"},
	{"Mono Mixer", "Line Bypass Switch", "Boost Mixer"},

	/* Speaker output mixer */
	{"Speaker Mixer", "PCM Playback Switch", "DAC"},
	{"Speaker Mixer", "Aux Playback Switch", "Aux Input"},
	{"Speaker Mixer", "Line Bypass Switch", "Boost Mixer"},

	/* Outputs */
	{"Mono Out", NULL, "Mono Mixer"},
	{"MONOOUT", NULL, "Mono Out"},
	{"SpkN Out", NULL, "Speaker Mixer"},
	{"SpkP Out", NULL, "Speaker Mixer"},
	{"SPKOUTN", NULL, "SpkN Out"},
	{"SPKOUTP", NULL, "SpkP Out"},

	/* Boost Mixer */
	{"ADC", NULL, "Boost Mixer"},
	{"Boost Mixer", "Aux Switch", "Aux Input"},
	{"Boost Mixer", NULL, "Input PGA"},
	{"Boost Mixer", NULL, "MICP"},

	/* Input PGA */
	{"Input PGA", "Aux Switch", "Aux Input"},
	{"Input PGA", "MicN Switch", "MICN"},
	{"Input PGA", "MicP Switch", "MICP"},

	/* Inputs */
	{"Aux Input", NULL, "AUX"},
	};

	struct pll_ {
	unsigned int pre_div:1;
	unsigned int n:4;
	unsigned int k;
	};

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

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

	/* There is a fixed divide by 4 in the output path */
	target *= 4;

	Ndiv = target / source;
	if (Ndiv < 6) {
	source /= 2;
	pll_div->pre_div = 1;
	Ndiv = target / source;
	} else
	pll_div->pre_div = 0;

	if ((Ndiv < 6) \|\| (Ndiv > 12))
	printk(KERN_WARNING
	"WM8974 N value %u outwith recommended range!\n",
	Ndiv);

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

	do_div(Kpart, source);

	K = Kpart & 0xFFFFFFFF;

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

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

	pll_div->k = K;
	}

	static int wm8974_set_dai_pll(struct snd_soc_dai *codec_dai, int pll_id,
	int source, unsigned int freq_in, unsigned int freq_out)
	{
	struct snd_soc_codec *codec = codec_dai->codec;
	struct pll_ pll_div;
	u16 reg;

	if (freq_in == 0 \|\| freq_out == 0) {
	/* Clock CODEC directly from MCLK */
	reg = snd_soc_read(codec, WM8974_CLOCK);
	snd_soc_write(codec, WM8974_CLOCK, reg & 0x0ff);

	/* Turn off PLL */
	reg = snd_soc_read(codec, WM8974_POWER1);
	snd_soc_write(codec, WM8974_POWER1, reg & 0x1df);
	return 0;
	}

	pll_factors(&pll_div, freq_out, freq_in);

	snd_soc_write(codec, WM8974_PLLN, (pll_div.pre_div << 4) \| pll_div.n);
	snd_soc_write(codec, WM8974_PLLK1, pll_div.k >> 18);
	snd_soc_write(codec, WM8974_PLLK2, (pll_div.k >> 9) & 0x1ff);
	snd_soc_write(codec, WM8974_PLLK3, pll_div.k & 0x1ff);
	reg = snd_soc_read(codec, WM8974_POWER1);
	snd_soc_write(codec, WM8974_POWER1, reg \| 0x020);

	/* Run CODEC from PLL instead of MCLK */
	reg = snd_soc_read(codec, WM8974_CLOCK);
	snd_soc_write(codec, WM8974_CLOCK, reg \| 0x100);

	return 0;
	}

	/*
	* Configure WM8974 clock dividers.
	*/
	static int wm8974_set_dai_clkdiv(struct snd_soc_dai *codec_dai,
	int div_id, int div)
	{
	struct snd_soc_codec *codec = codec_dai->codec;
	u16 reg;

	switch (div_id) {
	case WM8974_OPCLKDIV:
	reg = snd_soc_read(codec, WM8974_GPIO) & 0x1cf;
	snd_soc_write(codec, WM8974_GPIO, reg \| div);
	break;
	case WM8974_MCLKDIV:
	reg = snd_soc_read(codec, WM8974_CLOCK) & 0x11f;
	snd_soc_write(codec, WM8974_CLOCK, reg \| div);
	break;
	case WM8974_BCLKDIV:
	reg = snd_soc_read(codec, WM8974_CLOCK) & 0x1e3;
	snd_soc_write(codec, WM8974_CLOCK, reg \| div);
	break;
	default:
	return -EINVAL;
	}

	return 0;
	}

	static int wm8974_set_dai_fmt(struct snd_soc_dai *codec_dai,
	unsigned int fmt)
	{
	struct snd_soc_codec *codec = codec_dai->codec;
	u16 iface = 0;
	u16 clk = snd_soc_read(codec, WM8974_CLOCK) & 0x1fe;

	/* set master/slave audio interface */
	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
	case SND_SOC_DAIFMT_CBM_CFM:
	clk \|= 0x0001;
	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 \|= 0x0010;
	break;
	case SND_SOC_DAIFMT_RIGHT_J:
	break;
	case SND_SOC_DAIFMT_LEFT_J:
	iface \|= 0x0008;
	break;
	case SND_SOC_DAIFMT_DSP_A:
	iface \|= 0x00018;
	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 \|= 0x0180;
	break;
	case SND_SOC_DAIFMT_IB_NF:
	iface \|= 0x0100;
	break;
	case SND_SOC_DAIFMT_NB_IF:
	iface \|= 0x0080;
	break;
	default:
	return -EINVAL;
	}

	snd_soc_write(codec, WM8974_IFACE, iface);
	snd_soc_write(codec, WM8974_CLOCK, clk);
	return 0;
	}

	static int wm8974_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;
	u16 iface = snd_soc_read(codec, WM8974_IFACE) & 0x19f;
	u16 adn = snd_soc_read(codec, WM8974_ADD) & 0x1f1;

	/* bit size */
	switch (params_width(params)) {
	case 16:
	break;
	case 20:
	iface \|= 0x0020;
	break;
	case 24:
	iface \|= 0x0040;
	break;
	case 32:
	iface \|= 0x0060;
	break;
	}

	/* filter coefficient */
	switch (params_rate(params)) {
	case 8000:
	adn \|= 0x5 << 1;
	break;
	case 11025:
	adn \|= 0x4 << 1;
	break;
	case 16000:
	adn \|= 0x3 << 1;
	break;
	case 22050:
	adn \|= 0x2 << 1;
	break;
	case 32000:
	adn \|= 0x1 << 1;
	break;
	case 44100:
	case 48000:
	break;
	}

	snd_soc_write(codec, WM8974_IFACE, iface);
	snd_soc_write(codec, WM8974_ADD, adn);
	return 0;
	}

	static int wm8974_mute(struct snd_soc_dai *dai, int mute)
	{
	struct snd_soc_codec *codec = dai->codec;
	u16 mute_reg = snd_soc_read(codec, WM8974_DAC) & 0xffbf;

	if (mute)
	snd_soc_write(codec, WM8974_DAC, mute_reg \| 0x40);
	else
	snd_soc_write(codec, WM8974_DAC, mute_reg);
	return 0;
	}

	/* liam need to make this lower power with dapm */
	static int wm8974_set_bias_level(struct snd_soc_codec *codec,
	enum snd_soc_bias_level level)
	{
	u16 power1 = snd_soc_read(codec, WM8974_POWER1) & ~0x3;

	switch (level) {
	case SND_SOC_BIAS_ON:
	case SND_SOC_BIAS_PREPARE:
	power1 \|= 0x1; /* VMID 50k */
	snd_soc_write(codec, WM8974_POWER1, power1);
	break;

	case SND_SOC_BIAS_STANDBY:
	power1 \|= WM8974_POWER1_BIASEN \| WM8974_POWER1_BUFIOEN;

	if (codec->dapm.bias_level == SND_SOC_BIAS_OFF) {
	regcache_sync(dev_get_regmap(codec->dev, NULL));

	/* Initial cap charge at VMID 5k */
	snd_soc_write(codec, WM8974_POWER1, power1 \| 0x3);
	mdelay(100);
	}

	power1 \|= 0x2; /* VMID 500k */
	snd_soc_write(codec, WM8974_POWER1, power1);
	break;

	case SND_SOC_BIAS_OFF:
	snd_soc_write(codec, WM8974_POWER1, 0);
	snd_soc_write(codec, WM8974_POWER2, 0);
	snd_soc_write(codec, WM8974_POWER3, 0);
	break;
	}

	codec->dapm.bias_level = level;
	return 0;
	}

	#define WM8974_RATES (SNDRV_PCM_RATE_8000_48000)

	#define WM8974_FORMATS (SNDRV_PCM_FMTBIT_S16_LE \| SNDRV_PCM_FMTBIT_S20_3LE \|\
	SNDRV_PCM_FMTBIT_S24_LE)

	static const struct snd_soc_dai_ops wm8974_ops = {
	.hw_params = wm8974_pcm_hw_params,
	.digital_mute = wm8974_mute,
	.set_fmt = wm8974_set_dai_fmt,
	.set_clkdiv = wm8974_set_dai_clkdiv,
	.set_pll = wm8974_set_dai_pll,
	};

	static struct snd_soc_dai_driver wm8974_dai = {
	.name = "wm8974-hifi",
	.playback = {
	.stream_name = "Playback",
	.channels_min = 1,
	.channels_max = 2, /* Only 1 channel of data */
	.rates = WM8974_RATES,
	.formats = WM8974_FORMATS,},
	.capture = {
	.stream_name = "Capture",
	.channels_min = 1,
	.channels_max = 2, /* Only 1 channel of data */
	.rates = WM8974_RATES,
	.formats = WM8974_FORMATS,},
	.ops = &wm8974_ops,
	.symmetric_rates = 1,
	};

	static const struct regmap_config wm8974_regmap = {
	.reg_bits = 7,
	.val_bits = 9,

	.max_register = WM8974_MONOMIX,
	.reg_defaults = wm8974_reg_defaults,
	.num_reg_defaults = ARRAY_SIZE(wm8974_reg_defaults),
	};

	static int wm8974_probe(struct snd_soc_codec *codec)
	{
	int ret = 0;

	ret = wm8974_reset(codec);
	if (ret < 0) {
	dev_err(codec->dev, "Failed to issue reset\n");
	return ret;
	}

	return 0;
	}

	static struct snd_soc_codec_driver soc_codec_dev_wm8974 = {
	.probe = wm8974_probe,
	.set_bias_level = wm8974_set_bias_level,
	.suspend_bias_off = true,

	.controls = wm8974_snd_controls,
	.num_controls = ARRAY_SIZE(wm8974_snd_controls),
	.dapm_widgets = wm8974_dapm_widgets,
	.num_dapm_widgets = ARRAY_SIZE(wm8974_dapm_widgets),
	.dapm_routes = wm8974_dapm_routes,
	.num_dapm_routes = ARRAY_SIZE(wm8974_dapm_routes),
	};

	static int wm8974_i2c_probe(struct i2c_client *i2c,
	const struct i2c_device_id *id)
	{
	struct regmap *regmap;
	int ret;

	regmap = devm_regmap_init_i2c(i2c, &wm8974_regmap);
	if (IS_ERR(regmap))
	return PTR_ERR(regmap);

	ret = snd_soc_register_codec(&i2c->dev,
	&soc_codec_dev_wm8974, &wm8974_dai, 1);

	return ret;
	}

	static int wm8974_i2c_remove(struct i2c_client *client)
	{
	snd_soc_unregister_codec(&client->dev);

	return 0;
	}

	static const struct i2c_device_id wm8974_i2c_id[] = {
	{ "wm8974", 0 },
	{ }
	};
	MODULE_DEVICE_TABLE(i2c, wm8974_i2c_id);

	static struct i2c_driver wm8974_i2c_driver = {
	.driver = {
	.name = "wm8974",
	.owner = THIS_MODULE,
	},
	.probe = wm8974_i2c_probe,
	.remove = wm8974_i2c_remove,
	.id_table = wm8974_i2c_id,
	};

	module_i2c_driver(wm8974_i2c_driver);

	MODULE_DESCRIPTION("ASoC WM8974 driver");
	MODULE_AUTHOR("Liam Girdwood");
	MODULE_LICENSE("GPL");