[ALSA] ASoC S3C24xx machine drivers - Openmoko Neo1973

This patch adds ALSA support for the Openmoko Neo1973 phone. Features:-
 * HiFi Playback and capture.
 * Phone calls supported.
 * Support for BT PCM in WM8753 voice interface.
 * Support for LM4857 audio amp.
Signed-off-by: NGraeme Gregory <gg@opensource.wolfsonmicro.com>
Signed-off-by: NLiam Girdwood <lg@opensource.wolfsonmicro.com>
Signed-off-by: NTakashi Iwai <tiwai@suse.de>
Signed-off-by: NJaroslav Kysela <perex@suse.cz>

sound/soc/s3c24xx/neo1973_wm8753.c

+/*
+ * neo1973_wm8753.c  --  SoC audio for Neo1973
+ *
+ * Copyright 2007 Wolfson Microelectronics PLC.
+ * Author: Graeme Gregory
+ *         graeme.gregory@wolfsonmicro.com or linux@wolfsonmicro.com
+ *
+ *  This program is free software; you can redistribute  it and/or modify it
+ *  under  the terms of  the GNU General  Public License as published by the
+ *  Free Software Foundation;  either version 2 of the  License, or (at your
+ *  option) any later version.
+ *
+ *  Revision history
+ *    20th Jan 2007   Initial version.
+ *    05th Feb 2007   Rename all to Neo1973
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/timer.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/i2c.h>
+#include <sound/driver.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/soc.h>
+#include <sound/soc-dapm.h>
+
+#include <asm/mach-types.h>
+#include <asm/hardware/scoop.h>
+#include <asm/arch/regs-iis.h>
+#include <asm/arch/regs-clock.h>
+#include <asm/arch/regs-gpio.h>
+#include <asm/hardware.h>
+#include <asm/arch/audio.h>
+#include <asm/io.h>
+#include <asm/arch/spi-gpio.h>
+#include "../codecs/wm8753.h"
+#include "lm4857.h"
+#include "s3c24xx-pcm.h"
+#include "s3c24xx-i2s.h"
+
+/* define the scenarios */
+#define NEO_AUDIO_OFF			0
+#define NEO_GSM_CALL_AUDIO_HANDSET	1
+#define NEO_GSM_CALL_AUDIO_HEADSET	2
+#define NEO_GSM_CALL_AUDIO_BLUETOOTH	3
+#define NEO_STEREO_TO_SPEAKERS		4
+#define NEO_STEREO_TO_HEADPHONES	5
+#define NEO_CAPTURE_HANDSET		6
+#define NEO_CAPTURE_HEADSET		7
+#define NEO_CAPTURE_BLUETOOTH		8
+
+static struct snd_soc_machine neo1973;
+static struct i2c_client *i2c;
+
+static int neo1973_hifi_hw_params(struct snd_pcm_substream *substream,
+	struct snd_pcm_hw_params *params)
+{
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_soc_codec_dai *codec_dai = rtd->dai->codec_dai;
+	struct snd_soc_cpu_dai *cpu_dai = rtd->dai->cpu_dai;
+	unsigned int pll_out = 0, bclk = 0;
+	int ret = 0;
+	unsigned long iis_clkrate;
+
+	iis_clkrate = s3c24xx_i2s_get_clockrate();
+
+	switch (params_rate(params)) {
+	case 8000:
+	case 16000:
+		pll_out = 12288000;
+		break;
+	case 48000:
+		bclk = WM8753_BCLK_DIV_4;
+		pll_out = 12288000;
+		break;
+	case 96000:
+		bclk = WM8753_BCLK_DIV_2;
+		pll_out = 12288000;
+		break;
+	case 11025:
+		bclk = WM8753_BCLK_DIV_16;
+		pll_out = 11289600;
+		break;
+	case 22050:
+		bclk = WM8753_BCLK_DIV_8;
+		pll_out = 11289600;
+		break;
+	case 44100:
+		bclk = WM8753_BCLK_DIV_4;
+		pll_out = 11289600;
+		break;
+	case 88200:
+		bclk = WM8753_BCLK_DIV_2;
+		pll_out = 11289600;
+		break;
+	}
+
+	/* set codec DAI configuration */
+	ret = codec_dai->dai_ops.set_fmt(codec_dai,
+		SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
+		SND_SOC_DAIFMT_CBM_CFM);
+	if (ret < 0)
+		return ret;
+
+	/* set cpu DAI configuration */
+	ret = cpu_dai->dai_ops.set_fmt(cpu_dai,
+		SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
+		SND_SOC_DAIFMT_CBM_CFM);
+	if (ret < 0)
+		return ret;
+
+	/* set the codec system clock for DAC and ADC */
+	ret = codec_dai->dai_ops.set_sysclk(codec_dai, WM8753_MCLK, pll_out,
+		SND_SOC_CLOCK_IN);
+	if (ret < 0)
+		return ret;
+
+	/* set MCLK division for sample rate */
+	ret = cpu_dai->dai_ops.set_clkdiv(cpu_dai, S3C24XX_DIV_MCLK,
+		S3C2410_IISMOD_32FS );
+	if (ret < 0)
+		return ret;
+
+	/* set codec BCLK division for sample rate */
+	ret = codec_dai->dai_ops.set_clkdiv(codec_dai, WM8753_BCLKDIV, bclk);
+	if (ret < 0)
+		return ret;
+
+	/* set prescaler division for sample rate */
+	ret = cpu_dai->dai_ops.set_clkdiv(cpu_dai, S3C24XX_DIV_PRESCALER,
+		S3C24XX_PRESCALE(4,4));
+	if (ret < 0)
+		return ret;
+
+	/* codec PLL input is PCLK/4 */
+	ret = codec_dai->dai_ops.set_pll(codec_dai, WM8753_PLL1,
+		iis_clkrate / 4, pll_out);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+static int neo1973_hifi_hw_free(struct snd_pcm_substream *substream)
+{
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_soc_codec_dai *codec_dai = rtd->dai->codec_dai;
+
+	/* disable the PLL */
+	return codec_dai->dai_ops.set_pll(codec_dai, WM8753_PLL1, 0, 0);
+}
+
+/*
+ * Neo1973 WM8753 HiFi DAI opserations.
+ */
+static struct snd_soc_ops neo1973_hifi_ops = {
+	.hw_params = neo1973_hifi_hw_params,
+	.hw_free = neo1973_hifi_hw_free,
+};
+
+static int neo1973_voice_hw_params(struct snd_pcm_substream *substream,
+	struct snd_pcm_hw_params *params)
+{
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_soc_codec_dai *codec_dai = rtd->dai->codec_dai;
+	unsigned int pcmdiv = 0;
+	int ret = 0;
+	unsigned long iis_clkrate;
+
+	iis_clkrate = s3c24xx_i2s_get_clockrate();
+
+	if (params_rate(params) != 8000)
+		return -EINVAL;
+	if (params_channels(params) != 1)
+		return -EINVAL;
+
+	pcmdiv = WM8753_PCM_DIV_6; /* 2.048 MHz */
+
+	/* todo: gg check mode (DSP_B) against CSR datasheet */
+	/* set codec DAI configuration */
+	ret = codec_dai->dai_ops.set_fmt(codec_dai, SND_SOC_DAIFMT_DSP_B |
+		SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBS_CFS);
+	if (ret < 0)
+		return ret;
+
+	/* set the codec system clock for DAC and ADC */
+	ret = codec_dai->dai_ops.set_sysclk(codec_dai, WM8753_PCMCLK, 12288000,
+		SND_SOC_CLOCK_IN);
+	if (ret < 0)
+		return ret;
+
+	/* set codec PCM division for sample rate */
+	ret = codec_dai->dai_ops.set_clkdiv(codec_dai, WM8753_PCMDIV, pcmdiv);
+	if (ret < 0)
+		return ret;
+
+	/* configue and enable PLL for 12.288MHz output */
+	ret = codec_dai->dai_ops.set_pll(codec_dai, WM8753_PLL2,
+		iis_clkrate / 4, 12288000);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+static int neo1973_voice_hw_free(struct snd_pcm_substream *substream)
+{
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_soc_codec_dai *codec_dai = rtd->dai->codec_dai;
+
+	/* disable the PLL */
+	return codec_dai->dai_ops.set_pll(codec_dai, WM8753_PLL2, 0, 0);
+}
+
+static struct snd_soc_ops neo1973_voice_ops = {
+	.hw_params = neo1973_voice_hw_params,
+	.hw_free = neo1973_voice_hw_free,
+};
+
+static int neo1973_scenario = 0;
+
+static int neo1973_get_scenario(struct snd_kcontrol *kcontrol,
+	struct snd_ctl_elem_value *ucontrol)
+{
+	ucontrol->value.integer.value[0] = neo1973_scenario;
+	return 0;
+}
+
+static int set_scenario_endpoints(struct snd_soc_codec *codec, int scenario)
+{
+	switch(neo1973_scenario) {
+	case NEO_AUDIO_OFF:
+		snd_soc_dapm_set_endpoint(codec, "Audio Out",    0);
+		snd_soc_dapm_set_endpoint(codec, "GSM Line Out", 0);
+		snd_soc_dapm_set_endpoint(codec, "GSM Line In",  0);
+		snd_soc_dapm_set_endpoint(codec, "Headset Mic",  0);
+		snd_soc_dapm_set_endpoint(codec, "Call Mic",     0);
+		break;
+	case NEO_GSM_CALL_AUDIO_HANDSET:
+		snd_soc_dapm_set_endpoint(codec, "Audio Out",    1);
+		snd_soc_dapm_set_endpoint(codec, "GSM Line Out", 1);
+		snd_soc_dapm_set_endpoint(codec, "GSM Line In",  1);
+		snd_soc_dapm_set_endpoint(codec, "Headset Mic",  0);
+		snd_soc_dapm_set_endpoint(codec, "Call Mic",     1);
+		break;
+	case NEO_GSM_CALL_AUDIO_HEADSET:
+		snd_soc_dapm_set_endpoint(codec, "Audio Out",    1);
+		snd_soc_dapm_set_endpoint(codec, "GSM Line Out", 1);
+		snd_soc_dapm_set_endpoint(codec, "GSM Line In",  1);
+		snd_soc_dapm_set_endpoint(codec, "Headset Mic",  1);
+		snd_soc_dapm_set_endpoint(codec, "Call Mic",     0);
+		break;
+	case NEO_GSM_CALL_AUDIO_BLUETOOTH:
+		snd_soc_dapm_set_endpoint(codec, "Audio Out",    0);
+		snd_soc_dapm_set_endpoint(codec, "GSM Line Out", 1);
+		snd_soc_dapm_set_endpoint(codec, "GSM Line In",  1);
+		snd_soc_dapm_set_endpoint(codec, "Headset Mic",  0);
+		snd_soc_dapm_set_endpoint(codec, "Call Mic",     0);
+		break;
+	case NEO_STEREO_TO_SPEAKERS:
+		snd_soc_dapm_set_endpoint(codec, "Audio Out",    1);
+		snd_soc_dapm_set_endpoint(codec, "GSM Line Out", 0);
+		snd_soc_dapm_set_endpoint(codec, "GSM Line In",  0);
+		snd_soc_dapm_set_endpoint(codec, "Headset Mic",  0);
+		snd_soc_dapm_set_endpoint(codec, "Call Mic",     0);
+		break;
+	case NEO_STEREO_TO_HEADPHONES:
+		snd_soc_dapm_set_endpoint(codec, "Audio Out",    1);
+		snd_soc_dapm_set_endpoint(codec, "GSM Line Out", 0);
+		snd_soc_dapm_set_endpoint(codec, "GSM Line In",  0);
+		snd_soc_dapm_set_endpoint(codec, "Headset Mic",  0);
+		snd_soc_dapm_set_endpoint(codec, "Call Mic",     0);
+		break;
+	case NEO_CAPTURE_HANDSET:
+		snd_soc_dapm_set_endpoint(codec, "Audio Out",    0);
+		snd_soc_dapm_set_endpoint(codec, "GSM Line Out", 0);
+		snd_soc_dapm_set_endpoint(codec, "GSM Line In",  0);
+		snd_soc_dapm_set_endpoint(codec, "Headset Mic",  0);
+		snd_soc_dapm_set_endpoint(codec, "Call Mic",     1);
+		break;
+	case NEO_CAPTURE_HEADSET:
+		snd_soc_dapm_set_endpoint(codec, "Audio Out",    0);
+		snd_soc_dapm_set_endpoint(codec, "GSM Line Out", 0);
+		snd_soc_dapm_set_endpoint(codec, "GSM Line In",  0);
+		snd_soc_dapm_set_endpoint(codec, "Headset Mic",  1);
+		snd_soc_dapm_set_endpoint(codec, "Call Mic",     0);
+		break;
+	case NEO_CAPTURE_BLUETOOTH:
+		snd_soc_dapm_set_endpoint(codec, "Audio Out",    0);
+		snd_soc_dapm_set_endpoint(codec, "GSM Line Out", 0);
+		snd_soc_dapm_set_endpoint(codec, "GSM Line In",  0);
+		snd_soc_dapm_set_endpoint(codec, "Headset Mic",  0);
+		snd_soc_dapm_set_endpoint(codec, "Call Mic",     0);
+		break;
+	default:
+		snd_soc_dapm_set_endpoint(codec, "Audio Out",    0);
+		snd_soc_dapm_set_endpoint(codec, "GSM Line Out", 0);
+		snd_soc_dapm_set_endpoint(codec, "GSM Line In",  0);
+		snd_soc_dapm_set_endpoint(codec, "Headset Mic",  0);
+		snd_soc_dapm_set_endpoint(codec, "Call Mic",     0);
+	}
+
+	snd_soc_dapm_sync_endpoints(codec);
+
+	return 0;
+}
+
+static int neo1973_set_scenario(struct snd_kcontrol *kcontrol,
+	struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
+
+	if (neo1973_scenario == ucontrol->value.integer.value[0])
+		return 0;
+
+	neo1973_scenario = ucontrol->value.integer.value[0];
+	set_scenario_endpoints(codec, neo1973_scenario);
+	return 1;
+}
+
+static u8 lm4857_regs[4] = {0x00, 0x40, 0x80, 0xC0};
+
+static void lm4857_write_regs(void)
+{
+	if (i2c_master_send(i2c, lm4857_regs, 4) != 4)
+		printk(KERN_ERR "lm4857: i2c write failed\n");
+}
+
+static int lm4857_get_reg(struct snd_kcontrol *kcontrol,
+	struct snd_ctl_elem_value *ucontrol)
+{
+	int reg=kcontrol->private_value & 0xFF;
+	int shift = (kcontrol->private_value >> 8) & 0x0F;
+	int mask = (kcontrol->private_value >> 16) & 0xFF;
+
+	ucontrol->value.integer.value[0] = (lm4857_regs[reg] >> shift) & mask;
+	return 0;
+}
+
+static int lm4857_set_reg(struct snd_kcontrol *kcontrol,
+	struct snd_ctl_elem_value *ucontrol)
+{
+	int reg = kcontrol->private_value & 0xFF;
+	int shift = (kcontrol->private_value >> 8) & 0x0F;
+	int mask = (kcontrol->private_value >> 16) & 0xFF;
+
+	if (((lm4857_regs[reg] >> shift ) & mask) ==
+		ucontrol->value.integer.value[0])
+		return 0;
+
+	lm4857_regs[reg] &= ~ (mask << shift);
+	lm4857_regs[reg] |= ucontrol->value.integer.value[0] << shift;
+	lm4857_write_regs();
+	return 1;
+}
+
+static int lm4857_get_mode(struct snd_kcontrol *kcontrol,
+	struct snd_ctl_elem_value *ucontrol)
+{
+	u8 value = lm4857_regs[LM4857_CTRL] & 0x0F;
+
+	if (value)
+		value -= 5;
+
+	ucontrol->value.integer.value[0] = value;
+	return 0;
+}
+
+static int lm4857_set_mode(struct snd_kcontrol *kcontrol,
+	struct snd_ctl_elem_value *ucontrol)
+{
+	u8 value = ucontrol->value.integer.value[0];
+
+	if (value)
+		value += 5;
+
+	if ((lm4857_regs[LM4857_CTRL] & 0x0F) == value)
+		return 0;
+
+	lm4857_regs[LM4857_CTRL] &= 0xF0;
+	lm4857_regs[LM4857_CTRL] |= value;
+	lm4857_write_regs();
+	return 1;
+}
+
+static const struct snd_soc_dapm_widget wm8753_dapm_widgets[] = {
+	SND_SOC_DAPM_LINE("Audio Out", NULL),
+	SND_SOC_DAPM_LINE("GSM Line Out", NULL),
+	SND_SOC_DAPM_LINE("GSM Line In", NULL),
+	SND_SOC_DAPM_MIC("Headset Mic", NULL),
+	SND_SOC_DAPM_MIC("Call Mic", NULL),
+};
+
+
+/* example machine audio_mapnections */
+static const char* audio_map[][3] = {
+
+	/* Connections to the lm4857 amp */
+	{"Audio Out", NULL, "LOUT1"},
+	{"Audio Out", NULL, "ROUT1"},
+
+	/* Connections to the GSM Module */
+	{"GSM Line Out", NULL, "MONO1"},
+	{"GSM Line Out", NULL, "MONO2"},
+	{"RXP", NULL, "GSM Line In"},
+	{"RXN", NULL, "GSM Line In"},
+
+	/* Connections to Headset */
+	{"MIC1", NULL, "Mic Bias"},
+	{"Mic Bias", NULL, "Headset Mic"},
+
+	/* Call Mic */
+	{"MIC2", NULL, "Mic Bias"},
+	{"MIC2N", NULL, "Mic Bias"},
+	{"Mic Bias", NULL, "Call Mic"},
+
+	/* Connect the ALC pins */
+	{"ACIN", NULL, "ACOP"},
+
+	{NULL, NULL, NULL},
+};
+
+static const char *lm4857_mode[] = {
+	"Off",
+	"Call Speaker",
+	"Stereo Speakers",
+	"Stereo Speakers + Headphones",
+	"Headphones"
+};
+
+static const struct soc_enum lm4857_mode_enum[] = {
+	SOC_ENUM_SINGLE_EXT(ARRAY_SIZE(lm4857_mode), lm4857_mode),
+};
+
+static const char *neo_scenarios[] = {
+	"Off",
+	"GSM Handset",
+	"GSM Headset",
+	"GSM Bluetooth",
+	"Speakers",
+	"Headphones",
+	"Capture Handset",
+	"Capture Headset",
+	"Capture Bluetooth"
+};
+
+static const struct soc_enum neo_scenario_enum[] = {
+	SOC_ENUM_SINGLE_EXT(ARRAY_SIZE(neo_scenarios),neo_scenarios),
+};
+
+static const struct snd_kcontrol_new wm8753_neo1973_controls[] = {
+	SOC_SINGLE_EXT("Amp Left Playback Volume", LM4857_LVOL, 0, 31, 0,
+		lm4857_get_reg, lm4857_set_reg),
+	SOC_SINGLE_EXT("Amp Right Playback Volume", LM4857_RVOL, 0, 31, 0,
+		lm4857_get_reg, lm4857_set_reg),
+	SOC_SINGLE_EXT("Amp Mono Playback Volume", LM4857_MVOL, 0, 31, 0,
+		lm4857_get_reg, lm4857_set_reg),
+	SOC_ENUM_EXT("Amp Mode", lm4857_mode_enum[0],
+		lm4857_get_mode, lm4857_set_mode),
+	SOC_ENUM_EXT("Neo Mode", neo_scenario_enum[0],
+		neo1973_get_scenario, neo1973_set_scenario),
+	SOC_SINGLE_EXT("Amp Spk 3D Playback Switch", LM4857_LVOL, 5, 1, 0,
+		lm4857_get_reg, lm4857_set_reg),
+	SOC_SINGLE_EXT("Amp HP 3d Playback Switch", LM4857_RVOL, 5, 1, 0,
+		lm4857_get_reg, lm4857_set_reg),
+	SOC_SINGLE_EXT("Amp Fast Wakeup Playback Switch", LM4857_CTRL, 5, 1, 0,
+		lm4857_get_reg, lm4857_set_reg),
+	SOC_SINGLE_EXT("Amp Earpiece 6dB Playback Switch", LM4857_CTRL, 4, 1, 0,
+		lm4857_get_reg, lm4857_set_reg),
+};
+
+/*
+ * This is an example machine initialisation for a wm8753 connected to a
+ * neo1973 II. It is missing logic to detect hp/mic insertions and logic
+ * to re-route the audio in such an event.
+ */
+static int neo1973_wm8753_init(struct snd_soc_codec *codec)
+{
+	int i, err;
+
+	/* set up NC codec pins */
+	snd_soc_dapm_set_endpoint(codec, "LOUT2", 0);
+	snd_soc_dapm_set_endpoint(codec, "ROUT2", 0);
+	snd_soc_dapm_set_endpoint(codec, "OUT3",  0);
+	snd_soc_dapm_set_endpoint(codec, "OUT4",  0);
+	snd_soc_dapm_set_endpoint(codec, "LINE1", 0);
+	snd_soc_dapm_set_endpoint(codec, "LINE2", 0);
+
+
+	/* set endpoints to default mode */
+	set_scenario_endpoints(codec, NEO_AUDIO_OFF);
+
+	/* Add neo1973 specific widgets */
+	for (i = 0; i < ARRAY_SIZE(wm8753_dapm_widgets); i++)
+		snd_soc_dapm_new_control(codec, &wm8753_dapm_widgets[i]);
+
+	/* add neo1973 specific controls */
+	for (i = 0; i < ARRAY_SIZE(wm8753_neo1973_controls); i++) {
+		err = snd_ctl_add(codec->card,
+				snd_soc_cnew(&wm8753_neo1973_controls[i],
+				codec, NULL));
+		if (err < 0)
+			return err;
+	}
+
+	/* set up neo1973 specific audio path audio_mapnects */
+	for (i = 0; audio_map[i][0] != NULL; i++) {
+		snd_soc_dapm_connect_input(codec, audio_map[i][0],
+			audio_map[i][1], audio_map[i][2]);
+	}
+
+	snd_soc_dapm_sync_endpoints(codec);
+	return 0;
+}
+
+/*
+ * BT Codec DAI
+ */
+static struct snd_soc_cpu_dai bt_dai =
+{	.name = "Bluetooth",
+	.id = 0,
+	.type = SND_SOC_DAI_PCM,
+	.playback = {
+		.channels_min = 1,
+		.channels_max = 1,
+		.rates = SNDRV_PCM_RATE_8000,
+		.formats = SNDRV_PCM_FMTBIT_S16_LE,},
+	.capture = {
+		.channels_min = 1,
+		.channels_max = 1,
+		.rates = SNDRV_PCM_RATE_8000,
+		.formats = SNDRV_PCM_FMTBIT_S16_LE,},
+};
+
+static struct snd_soc_dai_link neo1973_dai[] = {
+{ /* Hifi Playback - for similatious use with voice below */
+	.name = "WM8753",
+	.stream_name = "WM8753 HiFi",
+	.cpu_dai = &s3c24xx_i2s_dai,
+	.codec_dai = &wm8753_dai[WM8753_DAI_HIFI],
+	.init = neo1973_wm8753_init,
+	.ops = &neo1973_hifi_ops,
+},
+{ /* Voice via BT */
+	.name = "Bluetooth",
+	.stream_name = "Voice",
+	.cpu_dai = &bt_dai,
+	.codec_dai = &wm8753_dai[WM8753_DAI_VOICE],
+	.ops = &neo1973_voice_ops,
+},
+};
+
+static struct snd_soc_machine neo1973 = {
+	.name = "neo1973",
+	.dai_link = neo1973_dai,
+	.num_links = ARRAY_SIZE(neo1973_dai),
+};
+
+static struct wm8753_setup_data neo1973_wm8753_setup = {
+	.i2c_address = 0x1a,
+};
+
+static struct snd_soc_device neo1973_snd_devdata = {
+	.machine = &neo1973,
+	.platform = &s3c24xx_soc_platform,
+	.codec_dev = &soc_codec_dev_wm8753,
+	.codec_data = &neo1973_wm8753_setup,
+};
+
+static struct i2c_client client_template;
+
+static unsigned short normal_i2c[] = { 0x7C, I2C_CLIENT_END };
+
+/* Magic definition of all other variables and things */
+I2C_CLIENT_INSMOD;
+
+static int lm4857_amp_probe(struct i2c_adapter *adap, int addr, int kind)
+{
+	int ret;
+
+	client_template.adapter = adap;
+	client_template.addr = addr;
+
+	i2c = kmemdup(&client_template, sizeof(client_template), GFP_KERNEL);
+	if (i2c == NULL)
+		return -ENOMEM;
+
+	ret = i2c_attach_client(i2c);
+	if (ret < 0) {
+		printk(KERN_ERR "LM4857 failed to attach at addr %x\n", addr);
+		goto exit_err;
+	}
+
+	lm4857_write_regs();
+	return ret;
+
+exit_err:
+	kfree(i2c);
+	return ret;
+}
+
+static int lm4857_i2c_detach(struct i2c_client *client)
+{
+	i2c_detach_client(client);
+	kfree(client);
+	return 0;
+}
+
+static int lm4857_i2c_attach(struct i2c_adapter *adap)
+{
+	return i2c_probe(adap, &addr_data, lm4857_amp_probe);
+}
+
+/* corgi i2c codec control layer */
+static struct i2c_driver lm4857_i2c_driver = {
+	.driver = {
+		.name = "LM4857 I2C Amp",
+		.owner = THIS_MODULE,
+	},
+	.id =             I2C_DRIVERID_LM4857,
+	.attach_adapter = lm4857_i2c_attach,
+	.detach_client =  lm4857_i2c_detach,
+	.command =        NULL,
+};
+
+static struct i2c_client client_template = {
+	.name =   "LM4857",
+	.driver = &lm4857_i2c_driver,
+};
+
+static struct platform_device *neo1973_snd_device;
+
+static int __init neo1973_init(void)
+{
+	int ret;
+
+	neo1973_snd_device = platform_device_alloc("soc-audio", -1);
+	if (!neo1973_snd_device)
+		return -ENOMEM;
+
+	platform_set_drvdata(neo1973_snd_device, &neo1973_snd_devdata);
+	neo1973_snd_devdata.dev = &neo1973_snd_device->dev;
+	ret = platform_device_add(neo1973_snd_device);
+
+	if (ret)
+		platform_device_put(neo1973_snd_device);
+
+	ret = i2c_add_driver(&lm4857_i2c_driver);
+	if (ret != 0)
+		printk(KERN_ERR "can't add i2c driver");
+
+	return ret;
+}
+
+static void __exit neo1973_exit(void)
+{
+	platform_device_unregister(neo1973_snd_device);
+}
+
+module_init(neo1973_init);
+module_exit(neo1973_exit);
+
+/* Module information */
+MODULE_AUTHOR("Graeme Gregory, graeme.gregory@wolfsonmicro.com, www.wolfsonmicro.com");
+MODULE_DESCRIPTION("ALSA SoC WM8753 Neo1973");
+MODULE_LICENSE("GPL");