linux/sound/soc/codecs/wm8770.c

/*
 * 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/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 u16 wm8770_reg_defs[WM8770_CACHEREGNUM] = {
	0x7f, 0x7f, 0x7f, 0x7f,
	0x7f, 0x7f, 0x7f, 0x7f,
	0x7f, 0xff, 0xff, 0xff,
	0xff, 0xff, 0xff, 0xff,
	0xff, 0xff, 0, 0x90, 0,
	0, 0x22, 0x22, 0x3e,
	0xc, 0xc, 0x100, 0x189,
	0x189, 0x8770
};

struct wm8770_priv {
	enum snd_soc_control_type control_type;
	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) { \
		wm8770->codec->cache_sync = 1; \
	} \
	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 const struct soc_enum ain_enum =
	SOC_ENUM_DOUBLE(WM8770_ADCMUX, 0, 4, 8, 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;

	codec = w->codec;

	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;

	codec = w->codec;

	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_format(params)) {
	case SNDRV_PCM_FORMAT_S16_LE:
		break;
	case SNDRV_PCM_FORMAT_S20_3LE:
		iface |= 0x10;
		break;
	case SNDRV_PCM_FORMAT_S24_LE:
		iface |= 0x20;
		break;
	case SNDRV_PCM_FORMAT_S32_LE:
		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 void wm8770_sync_cache(struct snd_soc_codec *codec)
{
	int i;
	u16 *cache;

	if (!codec->cache_sync)
		return;

	codec->cache_only = 0;
	cache = codec->reg_cache;
	for (i = 0; i < codec->driver->reg_cache_size; i++) {
		if (i == WM8770_RESET || cache[i] == wm8770_reg_defs[i])
			continue;
		snd_soc_write(codec, i, cache[i]);
	}
	codec->cache_sync = 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 (codec->dapm.bias_level == 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;
			}
			wm8770_sync_cache(codec);
			/* 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;
	}

	codec->dapm.bias_level = level;
	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
};

#ifdef CONFIG_PM
static int wm8770_suspend(struct snd_soc_codec *codec)
{
	wm8770_set_bias_level(codec, SND_SOC_BIAS_OFF);
	return 0;
}

static int wm8770_resume(struct snd_soc_codec *codec)
{
	wm8770_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
	return 0;
}
#else
#define wm8770_suspend NULL
#define wm8770_resume NULL
#endif

static int wm8770_probe(struct snd_soc_codec *codec)
{
	struct wm8770_priv *wm8770;
	int ret;
	int i;

	wm8770 = snd_soc_codec_get_drvdata(codec);
	wm8770->codec = codec;

	codec->dapm.idle_bias_off = 1;

	ret = snd_soc_codec_set_cache_io(codec, 7, 9, wm8770->control_type);
	if (ret < 0) {
		dev_err(codec->dev, "Failed to set cache I/O: %d\n", ret);
		return ret;
	}

	for (i = 0; i < ARRAY_SIZE(wm8770->supplies); i++)
		wm8770->supplies[i].supply = wm8770_supply_names[i];

	ret = regulator_bulk_get(codec->dev, ARRAY_SIZE(wm8770->supplies),
				 wm8770->supplies);
	if (ret) {
		dev_err(codec->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(codec->dev,
				"Failed to register regulator notifier: %d\n",
				ret);
		}
	}

	ret = regulator_bulk_enable(ARRAY_SIZE(wm8770->supplies),
				    wm8770->supplies);
	if (ret) {
		dev_err(codec->dev, "Failed to enable supplies: %d\n", ret);
		goto err_reg_get;
	}

	ret = wm8770_reset(codec);
	if (ret < 0) {
		dev_err(codec->dev, "Failed to issue reset: %d\n", ret);
		goto err_reg_enable;
	}

	wm8770_set_bias_level(codec, SND_SOC_BIAS_STANDBY);

	/* 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);

	snd_soc_add_controls(codec, wm8770_snd_controls,
			     ARRAY_SIZE(wm8770_snd_controls));
	snd_soc_dapm_new_controls(&codec->dapm, wm8770_dapm_widgets,
				  ARRAY_SIZE(wm8770_dapm_widgets));
	snd_soc_dapm_add_routes(&codec->dapm, wm8770_intercon,
				ARRAY_SIZE(wm8770_intercon));
	return 0;

err_reg_enable:
	regulator_bulk_disable(ARRAY_SIZE(wm8770->supplies), wm8770->supplies);
err_reg_get:
	regulator_bulk_free(ARRAY_SIZE(wm8770->supplies), wm8770->supplies);
	return ret;
}

static int wm8770_remove(struct snd_soc_codec *codec)
{
	struct wm8770_priv *wm8770;
	int i;

	wm8770 = snd_soc_codec_get_drvdata(codec);
	wm8770_set_bias_level(codec, SND_SOC_BIAS_OFF);

	for (i = 0; i < ARRAY_SIZE(wm8770->supplies); ++i)
		regulator_unregister_notifier(wm8770->supplies[i].consumer,
					      &wm8770->disable_nb[i]);
	regulator_bulk_free(ARRAY_SIZE(wm8770->supplies), wm8770->supplies);
	return 0;
}

static struct snd_soc_codec_driver soc_codec_dev_wm8770 = {
	.probe = wm8770_probe,
	.remove = wm8770_remove,
	.suspend = wm8770_suspend,
	.resume = wm8770_resume,
	.set_bias_level = wm8770_set_bias_level,
	.reg_cache_size = ARRAY_SIZE(wm8770_reg_defs),
	.reg_word_size = sizeof (u16),
	.reg_cache_default = wm8770_reg_defs
};

static const struct of_device_id wm8770_of_match[] = {
	{ .compatible = "wlf,wm8770", },
	{ }
};
MODULE_DEVICE_TABLE(of, wm8770_of_match);

static int __devinit wm8770_spi_probe(struct spi_device *spi)
{
	struct wm8770_priv *wm8770;
	int ret;

	wm8770 = devm_kzalloc(&spi->dev, sizeof(struct wm8770_priv),
			      GFP_KERNEL);
	if (!wm8770)
		return -ENOMEM;

	wm8770->control_type = SND_SOC_SPI;
	spi_set_drvdata(spi, wm8770);

	ret = snd_soc_register_codec(&spi->dev,
				     &soc_codec_dev_wm8770, &wm8770_dai, 1);

	return ret;
}

static int __devexit wm8770_spi_remove(struct spi_device *spi)
{
	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 = __devexit_p(wm8770_spi_remove)
};

static int __init wm8770_modinit(void)
{
	int ret = 0;

	ret = spi_register_driver(&wm8770_spi_driver);
	if (ret) {
		printk(KERN_ERR "Failed to register wm8770 SPI driver: %d\n",
		       ret);
	}
	return ret;
}
module_init(wm8770_modinit);

static void __exit wm8770_exit(void)
{
	spi_unregister_driver(&wm8770_spi_driver);
}
module_exit(wm8770_exit);

MODULE_DESCRIPTION("ASoC WM8770 driver");
MODULE_AUTHOR("Dimitris Papastamos <dp@opensource.wolfsonmicro.com>");
MODULE_LICENSE("GPL");