1 files changed, 727 insertions, 0 deletions

diff --git a/sound/soc/codecs/wm8731.c b/sound/soc/codecs/wm8731.c
new file mode 100644
index 00000000..f5a0ec4a
--- /dev/null
+++ b/sound/soc/codecs/wm8731.c
@@ -0,0 +1,727 @@
+/*
+ * wm8731.c  --  WM8731 ALSA SoC Audio driver
+ *
+ * Copyright 2005 Openedhand Ltd.
+ *
+ * Author: Richard Purdie <richard@openedhand.com>
+ *
+ * Based on wm8753.c by Liam Girdwood
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/pm.h>
+#include <linux/i2c.h>
+#include <linux/slab.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/consumer.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/initval.h>
+#include <sound/tlv.h>
+
+#include "wm8731.h"
+
+#define WM8731_NUM_SUPPLIES 4
+static const char *wm8731_supply_names[WM8731_NUM_SUPPLIES] = {
+	"AVDD",
+	"HPVDD",
+	"DCVDD",
+	"DBVDD",
+};
+
+/* codec private data */
+struct wm8731_priv {
+	enum snd_soc_control_type control_type;
+	struct regulator_bulk_data supplies[WM8731_NUM_SUPPLIES];
+	unsigned int sysclk;
+	int sysclk_type;
+	int playback_fs;
+	bool deemph;
+};
+
+
+/*
+ * wm8731 register cache
+ * We can't read the WM8731 register space when we are
+ * using 2 wire for device control, so we cache them instead.
+ * There is no point in caching the reset register
+ */
+static const u16 wm8731_reg[WM8731_CACHEREGNUM] = {
+	0x0097, 0x0097, 0x0079, 0x0079,
+	0x000a, 0x0008, 0x009f, 0x000a,
+	0x0000, 0x0000
+};
+
+#define wm8731_reset(c)	snd_soc_write(c, WM8731_RESET, 0)
+
+static const char *wm8731_input_select[] = {"Line In", "Mic"};
+
+static const struct soc_enum wm8731_insel_enum =
+	SOC_ENUM_SINGLE(WM8731_APANA, 2, 2, wm8731_input_select);
+
+static int wm8731_deemph[] = { 0, 32000, 44100, 48000 };
+
+static int wm8731_set_deemph(struct snd_soc_codec *codec)
+{
+	struct wm8731_priv *wm8731 = snd_soc_codec_get_drvdata(codec);
+	int val, i, best;
+
+	/* If we're using deemphasis select the nearest available sample
+	 * rate.
+	 */
+	if (wm8731->deemph) {
+		best = 1;
+		for (i = 2; i < ARRAY_SIZE(wm8731_deemph); i++) {
+			if (abs(wm8731_deemph[i] - wm8731->playback_fs) <
+			    abs(wm8731_deemph[best] - wm8731->playback_fs))
+				best = i;
+		}
+
+		val = best << 1;
+	} else {
+		best = 0;
+		val = 0;
+	}
+
+	dev_dbg(codec->dev, "Set deemphasis %d (%dHz)\n",
+		best, wm8731_deemph[best]);
+
+	return snd_soc_update_bits(codec, WM8731_APDIGI, 0x6, val);
+}
+
+static int wm8731_get_deemph(struct snd_kcontrol *kcontrol,
+			     struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
+	struct wm8731_priv *wm8731 = snd_soc_codec_get_drvdata(codec);
+
+	ucontrol->value.enumerated.item[0] = wm8731->deemph;
+
+	return 0;
+}
+
+static int wm8731_put_deemph(struct snd_kcontrol *kcontrol,
+			     struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
+	struct wm8731_priv *wm8731 = snd_soc_codec_get_drvdata(codec);
+	int deemph = ucontrol->value.enumerated.item[0];
+	int ret = 0;
+
+	if (deemph > 1)
+		return -EINVAL;
+
+	mutex_lock(&codec->mutex);
+	if (wm8731->deemph != deemph) {
+		wm8731->deemph = deemph;
+
+		wm8731_set_deemph(codec);
+
+		ret = 1;
+	}
+	mutex_unlock(&codec->mutex);
+
+	return ret;
+}
+
+static const DECLARE_TLV_DB_SCALE(in_tlv, -3450, 150, 0);
+static const DECLARE_TLV_DB_SCALE(sidetone_tlv, -1500, 300, 0);
+static const DECLARE_TLV_DB_SCALE(out_tlv, -12100, 100, 1);
+static const DECLARE_TLV_DB_SCALE(mic_tlv, 0, 2000, 0);
+
+static const struct snd_kcontrol_new wm8731_snd_controls[] = {
+
+SOC_DOUBLE_R_TLV("Master Playback Volume", WM8731_LOUT1V, WM8731_ROUT1V,
+		 0, 127, 0, out_tlv),
+SOC_DOUBLE_R("Master Playback ZC Switch", WM8731_LOUT1V, WM8731_ROUT1V,
+	7, 1, 0),
+
+SOC_DOUBLE_R_TLV("Capture Volume", WM8731_LINVOL, WM8731_RINVOL, 0, 31, 0,
+		 in_tlv),
+SOC_DOUBLE_R("Line Capture Switch", WM8731_LINVOL, WM8731_RINVOL, 7, 1, 1),
+
+SOC_SINGLE_TLV("Mic Boost Volume", WM8731_APANA, 0, 1, 0, mic_tlv),
+SOC_SINGLE("Mic Capture Switch", WM8731_APANA, 1, 1, 1),
+
+SOC_SINGLE_TLV("Sidetone Playback Volume", WM8731_APANA, 6, 3, 1,
+	       sidetone_tlv),
+
+SOC_SINGLE("ADC High Pass Filter Switch", WM8731_APDIGI, 0, 1, 1),
+SOC_SINGLE("Store DC Offset Switch", WM8731_APDIGI, 4, 1, 0),
+
+SOC_SINGLE_BOOL_EXT("Playback Deemphasis Switch", 0,
+		    wm8731_get_deemph, wm8731_put_deemph),
+};
+
+/* Output Mixer */
+static const struct snd_kcontrol_new wm8731_output_mixer_controls[] = {
+SOC_DAPM_SINGLE("Line Bypass Switch", WM8731_APANA, 3, 1, 0),
+SOC_DAPM_SINGLE("Mic Sidetone Switch", WM8731_APANA, 5, 1, 0),
+SOC_DAPM_SINGLE("HiFi Playback Switch", WM8731_APANA, 4, 1, 0),
+};
+
+/* Input mux */
+static const struct snd_kcontrol_new wm8731_input_mux_controls =
+SOC_DAPM_ENUM("Input Select", wm8731_insel_enum);
+
+static const struct snd_soc_dapm_widget wm8731_dapm_widgets[] = {
+SND_SOC_DAPM_SUPPLY("ACTIVE",WM8731_ACTIVE, 0, 0, NULL, 0),
+SND_SOC_DAPM_SUPPLY("OSC", WM8731_PWR, 5, 1, NULL, 0),
+SND_SOC_DAPM_MIXER("Output Mixer", WM8731_PWR, 4, 1,
+	&wm8731_output_mixer_controls[0],
+	ARRAY_SIZE(wm8731_output_mixer_controls)),
+SND_SOC_DAPM_DAC("DAC", "HiFi Playback", WM8731_PWR, 3, 1),
+SND_SOC_DAPM_OUTPUT("LOUT"),
+SND_SOC_DAPM_OUTPUT("LHPOUT"),
+SND_SOC_DAPM_OUTPUT("ROUT"),
+SND_SOC_DAPM_OUTPUT("RHPOUT"),
+SND_SOC_DAPM_ADC("ADC", "HiFi Capture", WM8731_PWR, 2, 1),
+SND_SOC_DAPM_MUX("Input Mux", SND_SOC_NOPM, 0, 0, &wm8731_input_mux_controls),
+SND_SOC_DAPM_PGA("Line Input", WM8731_PWR, 0, 1, NULL, 0),
+SND_SOC_DAPM_MICBIAS("Mic Bias", WM8731_PWR, 1, 1),
+SND_SOC_DAPM_INPUT("MICIN"),
+SND_SOC_DAPM_INPUT("RLINEIN"),
+SND_SOC_DAPM_INPUT("LLINEIN"),
+};
+
+static int wm8731_check_osc(struct snd_soc_dapm_widget *source,
+			    struct snd_soc_dapm_widget *sink)
+{
+	struct wm8731_priv *wm8731 = snd_soc_codec_get_drvdata(source->codec);
+
+	return wm8731->sysclk_type == WM8731_SYSCLK_XTAL;
+}
+
+static const struct snd_soc_dapm_route wm8731_intercon[] = {
+	{"DAC", NULL, "OSC", wm8731_check_osc},
+	{"ADC", NULL, "OSC", wm8731_check_osc},
+	{"DAC", NULL, "ACTIVE"},
+	{"ADC", NULL, "ACTIVE"},
+
+	/* output mixer */
+	{"Output Mixer", "Line Bypass Switch", "Line Input"},
+	{"Output Mixer", "HiFi Playback Switch", "DAC"},
+	{"Output Mixer", "Mic Sidetone Switch", "Mic Bias"},
+
+	/* outputs */
+	{"RHPOUT", NULL, "Output Mixer"},
+	{"ROUT", NULL, "Output Mixer"},
+	{"LHPOUT", NULL, "Output Mixer"},
+	{"LOUT", NULL, "Output Mixer"},
+
+	/* input mux */
+	{"Input Mux", "Line In", "Line Input"},
+	{"Input Mux", "Mic", "Mic Bias"},
+	{"ADC", NULL, "Input Mux"},
+
+	/* inputs */
+	{"Line Input", NULL, "LLINEIN"},
+	{"Line Input", NULL, "RLINEIN"},
+	{"Mic Bias", NULL, "MICIN"},
+};
+
+struct _coeff_div {
+	u32 mclk;
+	u32 rate;
+	u16 fs;
+	u8 sr:4;
+	u8 bosr:1;
+	u8 usb:1;
+};
+
+/* codec mclk clock divider coefficients */
+static const struct _coeff_div coeff_div[] = {
+	/* 48k */
+	{12288000, 48000, 256, 0x0, 0x0, 0x0},
+	{18432000, 48000, 384, 0x0, 0x1, 0x0},
+	{12000000, 48000, 250, 0x0, 0x0, 0x1},
+
+	/* 32k */
+	{12288000, 32000, 384, 0x6, 0x0, 0x0},
+	{18432000, 32000, 576, 0x6, 0x1, 0x0},
+	{12000000, 32000, 375, 0x6, 0x0, 0x1},
+
+	/* 8k */
+	{12288000, 8000, 1536, 0x3, 0x0, 0x0},
+	{18432000, 8000, 2304, 0x3, 0x1, 0x0},
+	{11289600, 8000, 1408, 0xb, 0x0, 0x0},
+	{16934400, 8000, 2112, 0xb, 0x1, 0x0},
+	{12000000, 8000, 1500, 0x3, 0x0, 0x1},
+
+	/* 96k */
+	{12288000, 96000, 128, 0x7, 0x0, 0x0},
+	{18432000, 96000, 192, 0x7, 0x1, 0x0},
+	{12000000, 96000, 125, 0x7, 0x0, 0x1},
+
+	/* 44.1k */
+	{11289600, 44100, 256, 0x8, 0x0, 0x0},
+	{16934400, 44100, 384, 0x8, 0x1, 0x0},
+	{12000000, 44100, 272, 0x8, 0x1, 0x1},
+
+	/* 88.2k */
+	{11289600, 88200, 128, 0xf, 0x0, 0x0},
+	{16934400, 88200, 192, 0xf, 0x1, 0x0},
+	{12000000, 88200, 136, 0xf, 0x1, 0x1},
+};
+
+static inline int get_coeff(int mclk, int rate)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(coeff_div); i++) {
+		if (coeff_div[i].rate == rate && coeff_div[i].mclk == mclk)
+			return i;
+	}
+	return 0;
+}
+
+static int wm8731_hw_params(struct snd_pcm_substream *substream,
+			    struct snd_pcm_hw_params *params,
+			    struct snd_soc_dai *dai)
+{
+	struct snd_soc_codec *codec = dai->codec;
+	struct wm8731_priv *wm8731 = snd_soc_codec_get_drvdata(codec);
+	u16 iface = snd_soc_read(codec, WM8731_IFACE) & 0xfff3;
+	int i = get_coeff(wm8731->sysclk, params_rate(params));
+	u16 srate = (coeff_div[i].sr << 2) |
+		(coeff_div[i].bosr << 1) | coeff_div[i].usb;
+
+	wm8731->playback_fs = params_rate(params);
+
+	snd_soc_write(codec, WM8731_SRATE, srate);
+
+	/* bit size */
+	switch (params_format(params)) {
+	case SNDRV_PCM_FORMAT_S16_LE:
+		break;
+	case SNDRV_PCM_FORMAT_S20_3LE:
+		iface |= 0x0004;
+		break;
+	case SNDRV_PCM_FORMAT_S24_LE:
+		iface |= 0x0008;
+		break;
+	}
+
+	wm8731_set_deemph(codec);
+
+	snd_soc_write(codec, WM8731_IFACE, iface);
+	return 0;
+}
+
+static int wm8731_mute(struct snd_soc_dai *dai, int mute)
+{
+	struct snd_soc_codec *codec = dai->codec;
+	u16 mute_reg = snd_soc_read(codec, WM8731_APDIGI) & 0xfff7;
+
+	if (mute)
+		snd_soc_write(codec, WM8731_APDIGI, mute_reg | 0x8);
+	else
+		snd_soc_write(codec, WM8731_APDIGI, mute_reg);
+	return 0;
+}
+
+static int wm8731_set_dai_sysclk(struct snd_soc_dai *codec_dai,
+		int clk_id, unsigned int freq, int dir)
+{
+	struct snd_soc_codec *codec = codec_dai->codec;
+	struct wm8731_priv *wm8731 = snd_soc_codec_get_drvdata(codec);
+
+	switch (clk_id) {
+	case WM8731_SYSCLK_XTAL:
+	case WM8731_SYSCLK_MCLK:
+		wm8731->sysclk_type = clk_id;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	switch (freq) {
+	case 11289600:
+	case 12000000:
+	case 12288000:
+	case 16934400:
+	case 18432000:
+		wm8731->sysclk = freq;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	snd_soc_dapm_sync(&codec->dapm);
+
+	return 0;
+}
+
+
+static int wm8731_set_dai_fmt(struct snd_soc_dai *codec_dai,
+		unsigned int fmt)
+{
+	struct snd_soc_codec *codec = codec_dai->codec;
+	u16 iface = 0;
+
+	/* set master/slave audio interface */
+	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
+	case SND_SOC_DAIFMT_CBM_CFM:
+		iface |= 0x0040;
+		break;
+	case SND_SOC_DAIFMT_CBS_CFS:
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	/* interface format */
+	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
+	case SND_SOC_DAIFMT_I2S:
+		iface |= 0x0002;
+		break;
+	case SND_SOC_DAIFMT_RIGHT_J:
+		break;
+	case SND_SOC_DAIFMT_LEFT_J:
+		iface |= 0x0001;
+		break;
+	case SND_SOC_DAIFMT_DSP_A:
+		iface |= 0x0003;
+		break;
+	case SND_SOC_DAIFMT_DSP_B:
+		iface |= 0x0013;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	/* clock inversion */
+	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
+	case SND_SOC_DAIFMT_NB_NF:
+		break;
+	case SND_SOC_DAIFMT_IB_IF:
+		iface |= 0x0090;
+		break;
+	case SND_SOC_DAIFMT_IB_NF:
+		iface |= 0x0080;
+		break;
+	case SND_SOC_DAIFMT_NB_IF:
+		iface |= 0x0010;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	/* set iface */
+	snd_soc_write(codec, WM8731_IFACE, iface);
+	return 0;
+}
+
+static int wm8731_set_bias_level(struct snd_soc_codec *codec,
+				 enum snd_soc_bias_level level)
+{
+	struct wm8731_priv *wm8731 = snd_soc_codec_get_drvdata(codec);
+	int i, ret;
+	u8 data[2];
+	u16 *cache = codec->reg_cache;
+	u16 reg;
+
+	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(wm8731->supplies),
+						    wm8731->supplies);
+			if (ret != 0)
+				return ret;
+
+			/* Sync reg_cache with the hardware */
+			for (i = 0; i < ARRAY_SIZE(wm8731_reg); i++) {
+				if (cache[i] == wm8731_reg[i])
+					continue;
+
+				data[0] = (i << 1) | ((cache[i] >> 8)
+						      & 0x0001);
+				data[1] = cache[i] & 0x00ff;
+				codec->hw_write(codec->control_data, data, 2);
+			}
+		}
+
+		/* Clear PWROFF, gate CLKOUT, everything else as-is */
+		reg = snd_soc_read(codec, WM8731_PWR) & 0xff7f;
+		snd_soc_write(codec, WM8731_PWR, reg | 0x0040);
+		break;
+	case SND_SOC_BIAS_OFF:
+		snd_soc_write(codec, WM8731_PWR, 0xffff);
+		regulator_bulk_disable(ARRAY_SIZE(wm8731->supplies),
+				       wm8731->supplies);
+		codec->cache_sync = 1;
+		break;
+	}
+	codec->dapm.bias_level = level;
+	return 0;
+}
+
+#define WM8731_RATES SNDRV_PCM_RATE_8000_96000
+
+#define WM8731_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
+	SNDRV_PCM_FMTBIT_S24_LE)
+
+static struct snd_soc_dai_ops wm8731_dai_ops = {
+	.hw_params	= wm8731_hw_params,
+	.digital_mute	= wm8731_mute,
+	.set_sysclk	= wm8731_set_dai_sysclk,
+	.set_fmt	= wm8731_set_dai_fmt,
+};
+
+static struct snd_soc_dai_driver wm8731_dai = {
+	.name = "wm8731-hifi",
+	.playback = {
+		.stream_name = "Playback",
+		.channels_min = 1,
+		.channels_max = 2,
+		.rates = WM8731_RATES,
+		.formats = WM8731_FORMATS,},
+	.capture = {
+		.stream_name = "Capture",
+		.channels_min = 1,
+		.channels_max = 2,
+		.rates = WM8731_RATES,
+		.formats = WM8731_FORMATS,},
+	.ops = &wm8731_dai_ops,
+	.symmetric_rates = 1,
+};
+
+#ifdef CONFIG_PM
+static int wm8731_suspend(struct snd_soc_codec *codec, pm_message_t state)
+{
+	wm8731_set_bias_level(codec, SND_SOC_BIAS_OFF);
+
+	return 0;
+}
+
+static int wm8731_resume(struct snd_soc_codec *codec)
+{
+	wm8731_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
+
+	return 0;
+}
+#else
+#define wm8731_suspend NULL
+#define wm8731_resume NULL
+#endif
+
+static int wm8731_probe(struct snd_soc_codec *codec)
+{
+	struct wm8731_priv *wm8731 = snd_soc_codec_get_drvdata(codec);
+	int ret = 0, i;
+
+	ret = snd_soc_codec_set_cache_io(codec, 7, 9, wm8731->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(wm8731->supplies); i++)
+		wm8731->supplies[i].supply = wm8731_supply_names[i];
+
+	ret = regulator_bulk_get(codec->dev, ARRAY_SIZE(wm8731->supplies),
+				 wm8731->supplies);
+	if (ret != 0) {
+		dev_err(codec->dev, "Failed to request supplies: %d\n", ret);
+		return ret;
+	}
+
+	ret = regulator_bulk_enable(ARRAY_SIZE(wm8731->supplies),
+				    wm8731->supplies);
+	if (ret != 0) {
+		dev_err(codec->dev, "Failed to enable supplies: %d\n", ret);
+		goto err_regulator_get;
+	}
+
+	ret = wm8731_reset(codec);
+	if (ret < 0) {
+		dev_err(codec->dev, "Failed to issue reset: %d\n", ret);
+		goto err_regulator_enable;
+	}
+
+	wm8731_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
+
+	/* Latch the update bits */
+	snd_soc_update_bits(codec, WM8731_LOUT1V, 0x100, 0);
+	snd_soc_update_bits(codec, WM8731_ROUT1V, 0x100, 0);
+	snd_soc_update_bits(codec, WM8731_LINVOL, 0x100, 0);
+	snd_soc_update_bits(codec, WM8731_RINVOL, 0x100, 0);
+
+	/* Disable bypass path by default */
+	snd_soc_update_bits(codec, WM8731_APANA, 0x8, 0);
+
+	snd_soc_add_controls(codec, wm8731_snd_controls,
+			     ARRAY_SIZE(wm8731_snd_controls));
+
+	/* Regulators will have been enabled by bias management */
+	regulator_bulk_disable(ARRAY_SIZE(wm8731->supplies), wm8731->supplies);
+
+	return 0;
+
+err_regulator_enable:
+	regulator_bulk_disable(ARRAY_SIZE(wm8731->supplies), wm8731->supplies);
+err_regulator_get:
+	regulator_bulk_free(ARRAY_SIZE(wm8731->supplies), wm8731->supplies);
+
+	return ret;
+}
+
+/* power down chip */
+static int wm8731_remove(struct snd_soc_codec *codec)
+{
+	struct wm8731_priv *wm8731 = snd_soc_codec_get_drvdata(codec);
+
+	wm8731_set_bias_level(codec, SND_SOC_BIAS_OFF);
+
+	regulator_bulk_disable(ARRAY_SIZE(wm8731->supplies), wm8731->supplies);
+	regulator_bulk_free(ARRAY_SIZE(wm8731->supplies), wm8731->supplies);
+
+	return 0;
+}
+
+static struct snd_soc_codec_driver soc_codec_dev_wm8731 = {
+	.probe =	wm8731_probe,
+	.remove =	wm8731_remove,
+	.suspend =	wm8731_suspend,
+	.resume =	wm8731_resume,
+	.set_bias_level = wm8731_set_bias_level,
+	.reg_cache_size = ARRAY_SIZE(wm8731_reg),
+	.reg_word_size = sizeof(u16),
+	.reg_cache_default = wm8731_reg,
+	.dapm_widgets = wm8731_dapm_widgets,
+	.num_dapm_widgets = ARRAY_SIZE(wm8731_dapm_widgets),
+	.dapm_routes = wm8731_intercon,
+	.num_dapm_routes = ARRAY_SIZE(wm8731_intercon),
+};
+
+#if defined(CONFIG_SPI_MASTER)
+static int __devinit wm8731_spi_probe(struct spi_device *spi)
+{
+	struct wm8731_priv *wm8731;
+	int ret;
+
+	wm8731 = kzalloc(sizeof(struct wm8731_priv), GFP_KERNEL);
+	if (wm8731 == NULL)
+		return -ENOMEM;
+
+	wm8731->control_type = SND_SOC_SPI;
+	spi_set_drvdata(spi, wm8731);
+
+	ret = snd_soc_register_codec(&spi->dev,
+			&soc_codec_dev_wm8731, &wm8731_dai, 1);
+	if (ret < 0)
+		kfree(wm8731);
+	return ret;
+}
+
+static int __devexit wm8731_spi_remove(struct spi_device *spi)
+{
+	snd_soc_unregister_codec(&spi->dev);
+	kfree(spi_get_drvdata(spi));
+	return 0;
+}
+
+static struct spi_driver wm8731_spi_driver = {
+	.driver = {
+		.name	= "wm8731",
+		.owner	= THIS_MODULE,
+	},
+	.probe		= wm8731_spi_probe,
+	.remove		= __devexit_p(wm8731_spi_remove),
+};
+#endif /* CONFIG_SPI_MASTER */
+
+#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
+static __devinit int wm8731_i2c_probe(struct i2c_client *i2c,
+				      const struct i2c_device_id *id)
+{
+	struct wm8731_priv *wm8731;
+	int ret;
+
+	wm8731 = kzalloc(sizeof(struct wm8731_priv), GFP_KERNEL);
+	if (wm8731 == NULL)
+		return -ENOMEM;
+
+	i2c_set_clientdata(i2c, wm8731);
+	wm8731->control_type = SND_SOC_I2C;
+
+	ret =  snd_soc_register_codec(&i2c->dev,
+			&soc_codec_dev_wm8731, &wm8731_dai, 1);
+	if (ret < 0)
+		kfree(wm8731);
+	return ret;
+}
+
+static __devexit int wm8731_i2c_remove(struct i2c_client *client)
+{
+	snd_soc_unregister_codec(&client->dev);
+	kfree(i2c_get_clientdata(client));
+	return 0;
+}
+
+static const struct i2c_device_id wm8731_i2c_id[] = {
+	{ "wm8731", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, wm8731_i2c_id);
+
+static struct i2c_driver wm8731_i2c_driver = {
+	.driver = {
+		.name = "wm8731",
+		.owner = THIS_MODULE,
+	},
+	.probe =    wm8731_i2c_probe,
+	.remove =   __devexit_p(wm8731_i2c_remove),
+	.id_table = wm8731_i2c_id,
+};
+#endif
+
+static int __init wm8731_modinit(void)
+{
+	int ret = 0;
+#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
+	ret = i2c_add_driver(&wm8731_i2c_driver);
+	if (ret != 0) {
+		printk(KERN_ERR "Failed to register WM8731 I2C driver: %d\n",
+		       ret);
+	}
+#endif
+#if defined(CONFIG_SPI_MASTER)
+	ret = spi_register_driver(&wm8731_spi_driver);
+	if (ret != 0) {
+		printk(KERN_ERR "Failed to register WM8731 SPI driver: %d\n",
+		       ret);
+	}
+#endif
+	return ret;
+}
+module_init(wm8731_modinit);
+
+static void __exit wm8731_exit(void)
+{
+#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
+	i2c_del_driver(&wm8731_i2c_driver);
+#endif
+#if defined(CONFIG_SPI_MASTER)
+	spi_unregister_driver(&wm8731_spi_driver);
+#endif
+}
+module_exit(wm8731_exit);
+
+MODULE_DESCRIPTION("ASoC WM8731 driver");
+MODULE_AUTHOR("Richard Purdie");
+MODULE_LICENSE("GPL");