text: /*
   * wm8510.c  --  WM8510 ALSA Soc Audio driver
   *
   * Copyright 2006 Wolfson Microelectronics PLC.
   *
   * Author: Liam Girdwood <lrg@slimlogic.co.uk>
   *
   * 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/platform_device.h>
  #include <linux/spi/spi.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 "wm8510.h"
  
  #define WM8510_VERSION "0.6"
  
  struct snd_soc_codec_device soc_codec_dev_wm8510;
  
  /*
   * wm8510 register cache
   * We can't read the WM8510 register space when we are
   * using 2 wire for device control, so we cache them instead.
   */
  static const u16 wm8510_reg[WM8510_CACHEREGNUM] = {
  	0x0000, 0x0000, 0x0000, 0x0000,
  	0x0050, 0x0000, 0x0140, 0x0000,
  	0x0000, 0x0000, 0x0000, 0x00ff,
  	0x0000, 0x0000, 0x0100, 0x00ff,
  	0x0000, 0x0000, 0x012c, 0x002c,
  	0x002c, 0x002c, 0x002c, 0x0000,
  	0x0032, 0x0000, 0x0000, 0x0000,
  	0x0000, 0x0000, 0x0000, 0x0000,
  	0x0038, 0x000b, 0x0032, 0x0000,
  	0x0008, 0x000c, 0x0093, 0x00e9,
  	0x0000, 0x0000, 0x0000, 0x0000,
  	0x0003, 0x0010, 0x0000, 0x0000,
  	0x0000, 0x0002, 0x0001, 0x0000,
  	0x0000, 0x0000, 0x0039, 0x0000,
  	0x0001,
  };
  
  #define WM8510_POWER1_BIASEN  0x08
  #define WM8510_POWER1_BUFIOEN 0x10
  
  #define wm8510_reset(c)	snd_soc_write(c, WM8510_RESET, 0)
  
  static const char *wm8510_companding[] = { "Off", "NC", "u-law", "A-law" };
  static const char *wm8510_deemp[] = { "None", "32kHz", "44.1kHz", "48kHz" };
  static const char *wm8510_alc[] = { "ALC", "Limiter" };
  
  static const struct soc_enum wm8510_enum[] = {
  	SOC_ENUM_SINGLE(WM8510_COMP, 1, 4, wm8510_companding), /* adc */
  	SOC_ENUM_SINGLE(WM8510_COMP, 3, 4, wm8510_companding), /* dac */
  	SOC_ENUM_SINGLE(WM8510_DAC,  4, 4, wm8510_deemp),
  	SOC_ENUM_SINGLE(WM8510_ALC3,  8, 2, wm8510_alc),
  };
  
  static const struct snd_kcontrol_new wm8510_snd_controls[] = {
  
  SOC_SINGLE("Digital Loopback Switch", WM8510_COMP, 0, 1, 0),
  
  SOC_ENUM("DAC Companding", wm8510_enum[1]),
  SOC_ENUM("ADC Companding", wm8510_enum[0]),
  
  SOC_ENUM("Playback De-emphasis", wm8510_enum[2]),
  SOC_SINGLE("DAC Inversion Switch", WM8510_DAC, 0, 1, 0),
  
  SOC_SINGLE("Master Playback Volume", WM8510_DACVOL, 0, 127, 0),
  
  SOC_SINGLE("High Pass Filter Switch", WM8510_ADC, 8, 1, 0),
  SOC_SINGLE("High Pass Cut Off", WM8510_ADC, 4, 7, 0),
  SOC_SINGLE("ADC Inversion Switch", WM8510_COMP, 0, 1, 0),
  
  SOC_SINGLE("Capture Volume", WM8510_ADCVOL,  0, 127, 0),
  
  SOC_SINGLE("DAC Playback Limiter Switch", WM8510_DACLIM1,  8, 1, 0),
  SOC_SINGLE("DAC Playback Limiter Decay", WM8510_DACLIM1,  4, 15, 0),
  SOC_SINGLE("DAC Playback Limiter Attack", WM8510_DACLIM1,  0, 15, 0),
  
  SOC_SINGLE("DAC Playback Limiter Threshold", WM8510_DACLIM2,  4, 7, 0),
  SOC_SINGLE("DAC Playback Limiter Boost", WM8510_DACLIM2,  0, 15, 0),
  
  SOC_SINGLE("ALC Enable Switch", WM8510_ALC1,  8, 1, 0),
  SOC_SINGLE("ALC Capture Max Gain", WM8510_ALC1,  3, 7, 0),
  SOC_SINGLE("ALC Capture Min Gain", WM8510_ALC1,  0, 7, 0),
  
  SOC_SINGLE("ALC Capture ZC Switch", WM8510_ALC2,  8, 1, 0),
  SOC_SINGLE("ALC Capture Hold", WM8510_ALC2,  4, 7, 0),
  SOC_SINGLE("ALC Capture Target", WM8510_ALC2,  0, 15, 0),
  
  SOC_ENUM("ALC Capture Mode", wm8510_enum[3]),
  SOC_SINGLE("ALC Capture Decay", WM8510_ALC3,  4, 15, 0),
  SOC_SINGLE("ALC Capture Attack", WM8510_ALC3,  0, 15, 0),
  
  SOC_SINGLE("ALC Capture Noise Gate Switch", WM8510_NGATE,  3, 1, 0),
  SOC_SINGLE("ALC Capture Noise Gate Threshold", WM8510_NGATE,  0, 7, 0),
  
  SOC_SINGLE("Capture PGA ZC Switch", WM8510_INPPGA,  7, 1, 0),
  SOC_SINGLE("Capture PGA Volume", WM8510_INPPGA,  0, 63, 0),
  
  SOC_SINGLE("Speaker Playback ZC Switch", WM8510_SPKVOL,  7, 1, 0),
  SOC_SINGLE("Speaker Playback Switch", WM8510_SPKVOL,  6, 1, 1),
  SOC_SINGLE("Speaker Playback Volume", WM8510_SPKVOL,  0, 63, 0),
  SOC_SINGLE("Speaker Boost", WM8510_OUTPUT, 2, 1, 0),
  
  SOC_SINGLE("Capture Boost(+20dB)", WM8510_ADCBOOST,  8, 1, 0),
  SOC_SINGLE("Mono Playback Switch", WM8510_MONOMIX, 6, 1, 1),
  };
  
  /* Speaker Output Mixer */
  static const struct snd_kcontrol_new wm8510_speaker_mixer_controls[] = {
  SOC_DAPM_SINGLE("Line Bypass Switch", WM8510_SPKMIX, 1, 1, 0),
  SOC_DAPM_SINGLE("Aux Playback Switch", WM8510_SPKMIX, 5, 1, 0),
  SOC_DAPM_SINGLE("PCM Playback Switch", WM8510_SPKMIX, 0, 1, 0),
  };
  
  /* Mono Output Mixer */
  static const struct snd_kcontrol_new wm8510_mono_mixer_controls[] = {
  SOC_DAPM_SINGLE("Line Bypass Switch", WM8510_MONOMIX, 1, 1, 0),
  SOC_DAPM_SINGLE("Aux Playback Switch", WM8510_MONOMIX, 2, 1, 0),
  SOC_DAPM_SINGLE("PCM Playback Switch", WM8510_MONOMIX, 0, 1, 0),
  };
  
  static const struct snd_kcontrol_new wm8510_boost_controls[] = {
  SOC_DAPM_SINGLE("Mic PGA Switch", WM8510_INPPGA,  6, 1, 1),
  SOC_DAPM_SINGLE("Aux Volume", WM8510_ADCBOOST, 0, 7, 0),
  SOC_DAPM_SINGLE("Mic Volume", WM8510_ADCBOOST, 4, 7, 0),
  };
  
  static const struct snd_kcontrol_new wm8510_micpga_controls[] = {
  SOC_DAPM_SINGLE("MICP Switch", WM8510_INPUT, 0, 1, 0),
  SOC_DAPM_SINGLE("MICN Switch", WM8510_INPUT, 1, 1, 0),
  SOC_DAPM_SINGLE("AUX Switch", WM8510_INPUT, 2, 1, 0),
  };
  
  static const struct snd_soc_dapm_widget wm8510_dapm_widgets[] = {
  SND_SOC_DAPM_MIXER("Speaker Mixer", WM8510_POWER3, 2, 0,
  	&wm8510_speaker_mixer_controls[0],
  	ARRAY_SIZE(wm8510_speaker_mixer_controls)),
  SND_SOC_DAPM_MIXER("Mono Mixer", WM8510_POWER3, 3, 0,
  	&wm8510_mono_mixer_controls[0],
  	ARRAY_SIZE(wm8510_mono_mixer_controls)),
  SND_SOC_DAPM_DAC("DAC", "HiFi Playback", WM8510_POWER3, 0, 0),
  SND_SOC_DAPM_ADC("ADC", "HiFi Capture", WM8510_POWER2, 0, 0),
  SND_SOC_DAPM_PGA("Aux Input", WM8510_POWER1, 6, 0, NULL, 0),
  SND_SOC_DAPM_PGA("SpkN Out", WM8510_POWER3, 5, 0, NULL, 0),
  SND_SOC_DAPM_PGA("SpkP Out", WM8510_POWER3, 6, 0, NULL, 0),
  SND_SOC_DAPM_PGA("Mono Out", WM8510_POWER3, 7, 0, NULL, 0),
  
  SND_SOC_DAPM_MIXER("Mic PGA", WM8510_POWER2, 2, 0,
  		   &wm8510_micpga_controls[0],
  		   ARRAY_SIZE(wm8510_micpga_controls)),
  SND_SOC_DAPM_MIXER("Boost Mixer", WM8510_POWER2, 4, 0,
  	&wm8510_boost_controls[0],
  	ARRAY_SIZE(wm8510_boost_controls)),
  
  SND_SOC_DAPM_MICBIAS("Mic Bias", WM8510_POWER1, 4, 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 audio_map[] = {
  	/* 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"},
  
  	/* Microphone PGA */
  	{"Mic PGA", "MICN Switch", "MICN"},
  	{"Mic PGA", "MICP Switch", "MICP"},
  	{ "Mic PGA", "AUX Switch", "Aux Input" },
  
  	/* Boost Mixer */
  	{"Boost Mixer", "Mic PGA Switch", "Mic PGA"},
  	{"Boost Mixer", "Mic Volume", "MICP"},
  	{"Boost Mixer", "Aux Volume", "Aux Input"},
  
  	{"ADC", NULL, "Boost Mixer"},
  };
  
  static int wm8510_add_widgets(struct snd_soc_codec *codec)
  {
  	snd_soc_dapm_new_controls(codec, wm8510_dapm_widgets,
  				  ARRAY_SIZE(wm8510_dapm_widgets));
  
  	snd_soc_dapm_add_routes(codec, audio_map, ARRAY_SIZE(audio_map));
  
  	snd_soc_dapm_new_widgets(codec);
  	return 0;
  }
  
  struct pll_ {
  	unsigned int pre_div:4; /* prescale - 1 */
  	unsigned int n:4;
  	unsigned int k;
  };
  
  static struct pll_ pll_div;
  
  /* 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(unsigned int target, unsigned int source)
  {
  	unsigned long long Kpart;
  	unsigned int K, Ndiv, Nmod;
  
  	Ndiv = target / source;
  	if (Ndiv < 6) {
  		source >>= 1;
  		pll_div.pre_div = 1;
  		Ndiv = target / source;
  	} else
  		pll_div.pre_div = 0;
  
  	if ((Ndiv < 6) || (Ndiv > 12))
  		printk(KERN_WARNING
  			"WM8510 N value %u outwith recommended range!d\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 wm8510_set_dai_pll(struct snd_soc_dai *codec_dai,
  		int pll_id, unsigned int freq_in, unsigned int freq_out)
  {
  	struct snd_soc_codec *codec = codec_dai->codec;
  	u16 reg;
  
  	if (freq_in == 0 || freq_out == 0) {
  		/* Clock CODEC directly from MCLK */
  		reg = snd_soc_read(codec, WM8510_CLOCK);
  		snd_soc_write(codec, WM8510_CLOCK, reg & 0x0ff);
  
  		/* Turn off PLL */
  		reg = snd_soc_read(codec, WM8510_POWER1);
  		snd_soc_write(codec, WM8510_POWER1, reg & 0x1df);
  		return 0;
  	}
  
  	pll_factors(freq_out*4, freq_in);
  
  	snd_soc_write(codec, WM8510_PLLN, (pll_div.pre_div << 4) | pll_div.n);
  	snd_soc_write(codec, WM8510_PLLK1, pll_div.k >> 18);
  	snd_soc_write(codec, WM8510_PLLK2, (pll_div.k >> 9) & 0x1ff);
  	snd_soc_write(codec, WM8510_PLLK3, pll_div.k & 0x1ff);
  	reg = snd_soc_read(codec, WM8510_POWER1);
  	snd_soc_write(codec, WM8510_POWER1, reg | 0x020);
  
  	/* Run CODEC from PLL instead of MCLK */
  	reg = snd_soc_read(codec, WM8510_CLOCK);
  	snd_soc_write(codec, WM8510_CLOCK, reg | 0x100);
  
  	return 0;
  }
  
  /*
   * Configure WM8510 clock dividers.
   */
  static int wm8510_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 WM8510_OPCLKDIV:
  		reg = snd_soc_read(codec, WM8510_GPIO) & 0x1cf;
  		snd_soc_write(codec, WM8510_GPIO, reg | div);
  		break;
  	case WM8510_MCLKDIV:
  		reg = snd_soc_read(codec, WM8510_CLOCK) & 0x11f;
  		snd_soc_write(codec, WM8510_CLOCK, reg | div);
  		break;
  	case WM8510_ADCCLK:
  		reg = snd_soc_read(codec, WM8510_ADC) & 0x1f7;
  		snd_soc_write(codec, WM8510_ADC, reg | div);
  		break;
  	case WM8510_DACCLK:
  		reg = snd_soc_read(codec, WM8510_DAC) & 0x1f7;
  		snd_soc_write(codec, WM8510_DAC, reg | div);
  		break;
  	case WM8510_BCLKDIV:
  		reg = snd_soc_read(codec, WM8510_CLOCK) & 0x1e3;
  		snd_soc_write(codec, WM8510_CLOCK, reg | div);
  		break;
  	default:
  		return -EINVAL;
  	}
  
  	return 0;
  }
  
  static int wm8510_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, WM8510_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, WM8510_IFACE, iface);
  	snd_soc_write(codec, WM8510_CLOCK, clk);
  	return 0;
  }
  
  static int wm8510_pcm_hw_params(struct snd_pcm_substream *substream,
  				struct snd_pcm_hw_params *params,
  				struct snd_soc_dai *dai)
  {
  	struct snd_soc_pcm_runtime *rtd = substream->private_data;
  	struct snd_soc_device *socdev = rtd->socdev;
  	struct snd_soc_codec *codec = socdev->card->codec;
  	u16 iface = snd_soc_read(codec, WM8510_IFACE) & 0x19f;
  	u16 adn = snd_soc_read(codec, WM8510_ADD) & 0x1f1;
  
  	/* bit size */
  	switch (params_format(params)) {
  	case SNDRV_PCM_FORMAT_S16_LE:
  		break;
  	case SNDRV_PCM_FORMAT_S20_3LE:
  		iface |= 0x0020;
  		break;
  	case SNDRV_PCM_FORMAT_S24_LE:
  		iface |= 0x0040;
  		break;
  	case SNDRV_PCM_FORMAT_S32_LE:
  		iface |= 0x0060;
  		break;
  	}
  
  	/* filter coefficient */
  	switch (params_rate(params)) {
  	case SNDRV_PCM_RATE_8000:
  		adn |= 0x5 << 1;
  		break;
  	case SNDRV_PCM_RATE_11025:
  		adn |= 0x4 << 1;
  		break;
  	case SNDRV_PCM_RATE_16000:
  		adn |= 0x3 << 1;
  		break;
  	case SNDRV_PCM_RATE_22050:
  		adn |= 0x2 << 1;
  		break;
  	case SNDRV_PCM_RATE_32000:
  		adn |= 0x1 << 1;
  		break;
  	case SNDRV_PCM_RATE_44100:
  	case SNDRV_PCM_RATE_48000:
  		break;
  	}
  
  	snd_soc_write(codec, WM8510_IFACE, iface);
  	snd_soc_write(codec, WM8510_ADD, adn);
  	return 0;
  }
  
  static int wm8510_mute(struct snd_soc_dai *dai, int mute)
  {
  	struct snd_soc_codec *codec = dai->codec;
  	u16 mute_reg = snd_soc_read(codec, WM8510_DAC) & 0xffbf;
  
  	if (mute)
  		snd_soc_write(codec, WM8510_DAC, mute_reg | 0x40);
  	else
  		snd_soc_write(codec, WM8510_DAC, mute_reg);
  	return 0;
  }
  
  /* liam need to make this lower power with dapm */
  static int wm8510_set_bias_level(struct snd_soc_codec *codec,
  	enum snd_soc_bias_level level)
  {
  	u16 power1 = snd_soc_read(codec, WM8510_POWER1) & ~0x3;
  
  	switch (level) {
  	case SND_SOC_BIAS_ON:
  	case SND_SOC_BIAS_PREPARE:
  		power1 |= 0x1;  /* VMID 50k */
  		snd_soc_write(codec, WM8510_POWER1, power1);
  		break;
  
  	case SND_SOC_BIAS_STANDBY:
  		power1 |= WM8510_POWER1_BIASEN | WM8510_POWER1_BUFIOEN;
  
  		if (codec->bias_level == SND_SOC_BIAS_OFF) {
  			/* Initial cap charge at VMID 5k */
  			snd_soc_write(codec, WM8510_POWER1, power1 | 0x3);
  			mdelay(100);
  		}
  
  		power1 |= 0x2;  /* VMID 500k */
  		snd_soc_write(codec, WM8510_POWER1, power1);
  		break;
  
  	case SND_SOC_BIAS_OFF:
  		snd_soc_write(codec, WM8510_POWER1, 0);
  		snd_soc_write(codec, WM8510_POWER2, 0);
  		snd_soc_write(codec, WM8510_POWER3, 0);
  		break;
  	}
  
  	codec->bias_level = level;
  	return 0;
  }
  
  #define WM8510_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 WM8510_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
  	SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S32_LE)
  
  static struct snd_soc_dai_ops wm8510_dai_ops = {
  	.hw_params	= wm8510_pcm_hw_params,
  	.digital_mute	= wm8510_mute,
  	.set_fmt	= wm8510_set_dai_fmt,
  	.set_clkdiv	= wm8510_set_dai_clkdiv,
  	.set_pll	= wm8510_set_dai_pll,
  };
  
  struct snd_soc_dai wm8510_dai = {
  	.name = "WM8510 HiFi",
  	.playback = {
  		.stream_name = "Playback",
  		.channels_min = 2,
  		.channels_max = 2,
  		.rates = WM8510_RATES,
  		.formats = WM8510_FORMATS,},
  	.capture = {
  		.stream_name = "Capture",
  		.channels_min = 2,
  		.channels_max = 2,
  		.rates = WM8510_RATES,
  		.formats = WM8510_FORMATS,},
  	.ops = &wm8510_dai_ops,
  	.symmetric_rates = 1,
  };
  EXPORT_SYMBOL_GPL(wm8510_dai);
  
  static int wm8510_suspend(struct platform_device *pdev, pm_message_t state)
  {
  	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
  	struct snd_soc_codec *codec = socdev->card->codec;
  
  	wm8510_set_bias_level(codec, SND_SOC_BIAS_OFF);
  	return 0;
  }
  
  static int wm8510_resume(struct platform_device *pdev)
  {
  	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
  	struct snd_soc_codec *codec = socdev->card->codec;
  	int i;
  	u8 data[2];
  	u16 *cache = codec->reg_cache;
  
  	/* Sync reg_cache with the hardware */
  	for (i = 0; i < ARRAY_SIZE(wm8510_reg); i++) {
  		data[0] = (i << 1) | ((cache[i] >> 8) & 0x0001);
  		data[1] = cache[i] & 0x00ff;
  		codec->hw_write(codec->control_data, data, 2);
  	}
  	wm8510_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
  	wm8510_set_bias_level(codec, codec->suspend_bias_level);
  	return 0;
  }
  
  /*
   * initialise the WM8510 driver
   * register the mixer and dsp interfaces with the kernel
   */
  static int wm8510_init(struct snd_soc_device *socdev,
  		       enum snd_soc_control_type control)
  {
  	struct snd_soc_codec *codec = socdev->card->codec;
  	int ret = 0;
  
  	codec->name = "WM8510";
  	codec->owner = THIS_MODULE;
  	codec->set_bias_level = wm8510_set_bias_level;
  	codec->dai = &wm8510_dai;
  	codec->num_dai = 1;
  	codec->reg_cache_size = ARRAY_SIZE(wm8510_reg);
  	codec->reg_cache = kmemdup(wm8510_reg, sizeof(wm8510_reg), GFP_KERNEL);
  
  	if (codec->reg_cache == NULL)
  		return -ENOMEM;
  
  	ret = snd_soc_codec_set_cache_io(codec, 7, 9, control);
  	if (ret < 0) {
  		printk(KERN_ERR "wm8510: failed to set cache I/O: %d\n",
  		       ret);
  		goto err;
  	}
  
  	wm8510_reset(codec);
  
  	/* register pcms */
  	ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
  	if (ret < 0) {
  		printk(KERN_ERR "wm8510: failed to create pcms\n");
  		goto err;
  	}
  
  	/* power on device */
  	codec->bias_level = SND_SOC_BIAS_OFF;
  	wm8510_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
  	snd_soc_add_controls(codec, wm8510_snd_controls,
  				ARRAY_SIZE(wm8510_snd_controls));
  	wm8510_add_widgets(codec);
  	ret = snd_soc_init_card(socdev);
  	if (ret < 0) {
  		printk(KERN_ERR "wm8510: failed to register card\n");
  		goto card_err;
  	}
  	return ret;
  
  card_err:
  	snd_soc_free_pcms(socdev);
  	snd_soc_dapm_free(socdev);
  err:
  	kfree(codec->reg_cache);
  	return ret;
  }
  
  static struct snd_soc_device *wm8510_socdev;
  
  #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
  
  /*
   * WM8510 2 wire address is 0x1a
   */
  
  static int wm8510_i2c_probe(struct i2c_client *i2c,
  			    const struct i2c_device_id *id)
  {
  	struct snd_soc_device *socdev = wm8510_socdev;
  	struct snd_soc_codec *codec = socdev->card->codec;
  	int ret;
  
  	i2c_set_clientdata(i2c, codec);
  	codec->control_data = i2c;
  
  	ret = wm8510_init(socdev, SND_SOC_I2C);
  	if (ret < 0)
  		pr_err("failed to initialise WM8510\n");
  
  	return ret;
  }
  
  static int wm8510_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 wm8510_i2c_id[] = {
  	{ "wm8510", 0 },
  	{ }
  };
  MODULE_DEVICE_TABLE(i2c, wm8510_i2c_id);
  
  static struct i2c_driver wm8510_i2c_driver = {
  	.driver = {
  		.name = "WM8510 I2C Codec",
  		.owner = THIS_MODULE,
  	},
  	.probe =    wm8510_i2c_probe,
  	.remove =   wm8510_i2c_remove,
  	.id_table = wm8510_i2c_id,
  };
  
  static int wm8510_add_i2c_device(struct platform_device *pdev,
  				 const struct wm8510_setup_data *setup)
  {
  	struct i2c_board_info info;
  	struct i2c_adapter *adapter;
  	struct i2c_client *client;
  	int ret;
  
  	ret = i2c_add_driver(&wm8510_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, "wm8510", 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(&wm8510_i2c_driver);
  	return -ENODEV;
  }
  #endif
  
  #if defined(CONFIG_SPI_MASTER)
  static int __devinit wm8510_spi_probe(struct spi_device *spi)
  {
  	struct snd_soc_device *socdev = wm8510_socdev;
  	struct snd_soc_codec *codec = socdev->card->codec;
  	int ret;
  
  	codec->control_data = spi;
  
  	ret = wm8510_init(socdev, SND_SOC_SPI);
  	if (ret < 0)
  		dev_err(&spi->dev, "failed to initialise WM8510\n");
  
  	return ret;
  }
  
  static int __devexit wm8510_spi_remove(struct spi_device *spi)
  {
  	return 0;
  }
  
  static struct spi_driver wm8510_spi_driver = {
  	.driver = {
  		.name	= "wm8510",
  		.bus	= &spi_bus_type,
  		.owner	= THIS_MODULE,
  	},
  	.probe		= wm8510_spi_probe,
  	.remove		= __devexit_p(wm8510_spi_remove),
  };
  #endif /* CONFIG_SPI_MASTER */
  
  static int wm8510_probe(struct platform_device *pdev)
  {
  	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
  	struct wm8510_setup_data *setup;
  	struct snd_soc_codec *codec;
  	int ret = 0;
  
  	pr_info("WM8510 Audio Codec %s", WM8510_VERSION);
  
  	setup = socdev->codec_data;
  	codec = kzalloc(sizeof(struct snd_soc_codec), GFP_KERNEL);
  	if (codec == NULL)
  		return -ENOMEM;
  
  	socdev->card->codec = codec;
  	mutex_init(&codec->mutex);
  	INIT_LIST_HEAD(&codec->dapm_widgets);
  	INIT_LIST_HEAD(&codec->dapm_paths);
  
  	wm8510_socdev = socdev;
  #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
  	if (setup->i2c_address) {
  		ret = wm8510_add_i2c_device(pdev, setup);
  	}
  #endif
  #if defined(CONFIG_SPI_MASTER)
  	if (setup->spi) {
  		ret = spi_register_driver(&wm8510_spi_driver);
  		if (ret != 0)
  			printk(KERN_ERR "can't add spi driver");
  	}
  #endif
  
  	if (ret != 0)
  		kfree(codec);
  	return ret;
  }
  
  /* power down chip */
  static int wm8510_remove(struct platform_device *pdev)
  {
  	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
  	struct snd_soc_codec *codec = socdev->card->codec;
  
  	if (codec->control_data)
  		wm8510_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(&wm8510_i2c_driver);
  #endif
  #if defined(CONFIG_SPI_MASTER)
  	spi_unregister_driver(&wm8510_spi_driver);
  #endif
  	kfree(codec);
  
  	return 0;
  }
  
  struct snd_soc_codec_device soc_codec_dev_wm8510 = {
  	.probe = 	wm8510_probe,
  	.remove = 	wm8510_remove,
  	.suspend = 	wm8510_suspend,
  	.resume =	wm8510_resume,
  };
  EXPORT_SYMBOL_GPL(soc_codec_dev_wm8510);
  
  static int __init wm8510_modinit(void)
  {
  	return snd_soc_register_dai(&wm8510_dai);
  }
  module_init(wm8510_modinit);
  
  static void __exit wm8510_exit(void)
  {
  	snd_soc_unregister_dai(&wm8510_dai);
  }
  module_exit(wm8510_exit);
  
  MODULE_DESCRIPTION("ASoC WM8510 driver");
  MODULE_AUTHOR("Liam Girdwood");
  MODULE_LICENSE("GPL");
  