sound/soc/s3c24xx/neo1973_wm8753.c - kernel/msm - Gitiles

 /*
  * 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.
  *
  */

 #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/core.h>
 #include <sound/pcm.h>
 #include <sound/soc.h>
 #include <sound/soc-dapm.h>
 #include <sound/tlv.h>

 #include <asm/mach-types.h>
 #include <asm/hardware/scoop.h>
 #include <mach/regs-clock.h>
 #include <mach/regs-gpio.h>
 #include <mach/hardware.h>
 #include <linux/io.h>
 #include <mach/spi-gpio.h>

 #include <plat/regs-iis.h>

 #include "../codecs/wm8753.h"
 #include "lm4857.h"
 #include "s3c-dma.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_card 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_dai *codec_dai = rtd->codec_dai;
 	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 	unsigned int pll_out = 0, bclk = 0;
 	int ret = 0;
 	unsigned long iis_clkrate;

 	pr_debug("Entered %s\n", __func__);

 	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 = snd_soc_dai_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 = snd_soc_dai_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 = snd_soc_dai_set_sysclk(codec_dai, WM8753_MCLK, pll_out,
 		SND_SOC_CLOCK_IN);
 	if (ret < 0)
 		return ret;

 	/* set MCLK division for sample rate */
 	ret = snd_soc_dai_set_clkdiv(cpu_dai, S3C24XX_DIV_MCLK,
 		S3C2410_IISMOD_32FS);
 	if (ret < 0)
 		return ret;

 	/* set codec BCLK division for sample rate */
 	ret = snd_soc_dai_set_clkdiv(codec_dai, WM8753_BCLKDIV, bclk);
 	if (ret < 0)
 		return ret;

 	/* set prescaler division for sample rate */
 	ret = snd_soc_dai_set_clkdiv(cpu_dai, S3C24XX_DIV_PRESCALER,
 		S3C24XX_PRESCALE(4, 4));
 	if (ret < 0)
 		return ret;

 	/* codec PLL input is PCLK/4 */
 	ret = snd_soc_dai_set_pll(codec_dai, WM8753_PLL1, 0,
 		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_dai *codec_dai = rtd->codec_dai;

 	pr_debug("Entered %s\n", __func__);

 	/* disable the PLL */
 	return snd_soc_dai_set_pll(codec_dai, WM8753_PLL1, 0, 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_dai *codec_dai = rtd->codec_dai;
 	unsigned int pcmdiv = 0;
 	int ret = 0;
 	unsigned long iis_clkrate;

 	pr_debug("Entered %s\n", __func__);

 	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 = snd_soc_dai_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 = snd_soc_dai_set_sysclk(codec_dai, WM8753_PCMCLK, 12288000,
 		SND_SOC_CLOCK_IN);
 	if (ret < 0)
 		return ret;

 	/* set codec PCM division for sample rate */
 	ret = snd_soc_dai_set_clkdiv(codec_dai, WM8753_PCMDIV, pcmdiv);
 	if (ret < 0)
 		return ret;

 	/* configure and enable PLL for 12.288MHz output */
 	ret = snd_soc_dai_set_pll(codec_dai, WM8753_PLL2, 0,
 		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_dai *codec_dai = rtd->codec_dai;

 	pr_debug("Entered %s\n", __func__);

 	/* disable the PLL */
 	return snd_soc_dai_set_pll(codec_dai, WM8753_PLL2, 0, 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;

 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)
 {
 	pr_debug("Entered %s\n", __func__);

 	switch (neo1973_scenario) {
 	case NEO_AUDIO_OFF:
 		snd_soc_dapm_disable_pin(codec, "Audio Out");
 		snd_soc_dapm_disable_pin(codec, "GSM Line Out");
 		snd_soc_dapm_disable_pin(codec, "GSM Line In");
 		snd_soc_dapm_disable_pin(codec, "Headset Mic");
 		snd_soc_dapm_disable_pin(codec, "Call Mic");
 		break;
 	case NEO_GSM_CALL_AUDIO_HANDSET:
 		snd_soc_dapm_enable_pin(codec, "Audio Out");
 		snd_soc_dapm_enable_pin(codec, "GSM Line Out");
 		snd_soc_dapm_enable_pin(codec, "GSM Line In");
 		snd_soc_dapm_disable_pin(codec, "Headset Mic");
 		snd_soc_dapm_enable_pin(codec, "Call Mic");
 		break;
 	case NEO_GSM_CALL_AUDIO_HEADSET:
 		snd_soc_dapm_enable_pin(codec, "Audio Out");
 		snd_soc_dapm_enable_pin(codec, "GSM Line Out");
 		snd_soc_dapm_enable_pin(codec, "GSM Line In");
 		snd_soc_dapm_enable_pin(codec, "Headset Mic");
 		snd_soc_dapm_disable_pin(codec, "Call Mic");
 		break;
 	case NEO_GSM_CALL_AUDIO_BLUETOOTH:
 		snd_soc_dapm_disable_pin(codec, "Audio Out");
 		snd_soc_dapm_enable_pin(codec, "GSM Line Out");
 		snd_soc_dapm_enable_pin(codec, "GSM Line In");
 		snd_soc_dapm_disable_pin(codec, "Headset Mic");
 		snd_soc_dapm_disable_pin(codec, "Call Mic");
 		break;
 	case NEO_STEREO_TO_SPEAKERS:
 		snd_soc_dapm_enable_pin(codec, "Audio Out");
 		snd_soc_dapm_disable_pin(codec, "GSM Line Out");
 		snd_soc_dapm_disable_pin(codec, "GSM Line In");
 		snd_soc_dapm_disable_pin(codec, "Headset Mic");
 		snd_soc_dapm_disable_pin(codec, "Call Mic");
 		break;
 	case NEO_STEREO_TO_HEADPHONES:
 		snd_soc_dapm_enable_pin(codec, "Audio Out");
 		snd_soc_dapm_disable_pin(codec, "GSM Line Out");
 		snd_soc_dapm_disable_pin(codec, "GSM Line In");
 		snd_soc_dapm_disable_pin(codec, "Headset Mic");
 		snd_soc_dapm_disable_pin(codec, "Call Mic");
 		break;
 	case NEO_CAPTURE_HANDSET:
 		snd_soc_dapm_disable_pin(codec, "Audio Out");
 		snd_soc_dapm_disable_pin(codec, "GSM Line Out");
 		snd_soc_dapm_disable_pin(codec, "GSM Line In");
 		snd_soc_dapm_disable_pin(codec, "Headset Mic");
 		snd_soc_dapm_enable_pin(codec, "Call Mic");
 		break;
 	case NEO_CAPTURE_HEADSET:
 		snd_soc_dapm_disable_pin(codec, "Audio Out");
 		snd_soc_dapm_disable_pin(codec, "GSM Line Out");
 		snd_soc_dapm_disable_pin(codec, "GSM Line In");
 		snd_soc_dapm_enable_pin(codec, "Headset Mic");
 		snd_soc_dapm_disable_pin(codec, "Call Mic");
 		break;
 	case NEO_CAPTURE_BLUETOOTH:
 		snd_soc_dapm_disable_pin(codec, "Audio Out");
 		snd_soc_dapm_disable_pin(codec, "GSM Line Out");
 		snd_soc_dapm_disable_pin(codec, "GSM Line In");
 		snd_soc_dapm_disable_pin(codec, "Headset Mic");
 		snd_soc_dapm_disable_pin(codec, "Call Mic");
 		break;
 	default:
 		snd_soc_dapm_disable_pin(codec, "Audio Out");
 		snd_soc_dapm_disable_pin(codec, "GSM Line Out");
 		snd_soc_dapm_disable_pin(codec, "GSM Line In");
 		snd_soc_dapm_disable_pin(codec, "Headset Mic");
 		snd_soc_dapm_disable_pin(codec, "Call Mic");
 	}

 	snd_soc_dapm_sync(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);

 	pr_debug("Entered %s\n", __func__);

 	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)
 {
 	pr_debug("Entered %s\n", __func__);

 	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)
 {
 	struct soc_mixer_control *mc =
 		(struct soc_mixer_control *)kcontrol->private_value;
 	int reg = mc->reg;
 	int shift = mc->shift;
 	int mask = mc->max;

 	pr_debug("Entered %s\n", __func__);

 	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)
 {
 	struct soc_mixer_control *mc =
 		(struct soc_mixer_control *)kcontrol->private_value;
 	int reg = mc->reg;
 	int shift = mc->shift;
 	int mask = mc->max;

 	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;

 	pr_debug("Entered %s\n", __func__);

 	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];

 	pr_debug("Entered %s\n", __func__);

 	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),
 };


 static const struct snd_soc_dapm_route dapm_routes[] = {

 	/* 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"},
 };

 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 DECLARE_TLV_DB_SCALE(stereo_tlv, -4050, 150, 0);
 static const DECLARE_TLV_DB_SCALE(mono_tlv, -3450, 150, 0);

 static const struct snd_kcontrol_new wm8753_neo1973_controls[] = {
 	SOC_SINGLE_EXT_TLV("Amp Left Playback Volume", LM4857_LVOL, 0, 31, 0,
 		lm4857_get_reg, lm4857_set_reg, stereo_tlv),
 	SOC_SINGLE_EXT_TLV("Amp Right Playback Volume", LM4857_RVOL, 0, 31, 0,
 		lm4857_get_reg, lm4857_set_reg, stereo_tlv),
 	SOC_SINGLE_EXT_TLV("Amp Mono Playback Volume", LM4857_MVOL, 0, 31, 0,
 		lm4857_get_reg, lm4857_set_reg, mono_tlv),
 	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_pcm_runtime *rtd)
 {
 	struct snd_soc_codec *codec = rtd->codec;
 	int err;

 	pr_debug("Entered %s\n", __func__);

 	/* set up NC codec pins */
 	snd_soc_dapm_nc_pin(codec, "LOUT2");
 	snd_soc_dapm_nc_pin(codec, "ROUT2");
 	snd_soc_dapm_nc_pin(codec, "OUT3");
 	snd_soc_dapm_nc_pin(codec, "OUT4");
 	snd_soc_dapm_nc_pin(codec, "LINE1");
 	snd_soc_dapm_nc_pin(codec, "LINE2");

 	/* Add neo1973 specific widgets */
 	snd_soc_dapm_new_controls(codec, wm8753_dapm_widgets,
 				  ARRAY_SIZE(wm8753_dapm_widgets));

 	/* set endpoints to default mode */
 	set_scenario_endpoints(codec, NEO_AUDIO_OFF);

 	/* add neo1973 specific controls */
 	err = snd_soc_add_controls(codec, wm8753_neo1973_controls,
 				ARRAY_SIZE(8753_neo1973_controls));
 	if (err < 0)
 		return err;

 	/* set up neo1973 specific audio routes */
 	err = snd_soc_dapm_add_routes(codec, dapm_routes,
 				      ARRAY_SIZE(dapm_routes));

 	snd_soc_dapm_sync(codec);
 	return 0;
 }

 /*
  * BT Codec DAI
  */
 static struct snd_soc_dai bt_dai = {
 	.name = "bluetooth-dai",
 	.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",
 	.platform_name = "s3c24xx-pcm-audio",
 	.cpu_dai_name = "s3c24xx-i2s",
 	.codec_dai_name = "wm8753-hifi",
 	.codec_name = "wm8753-codec.0-0x1a",
 	.init = neo1973_wm8753_init,
 	.ops = &neo1973_hifi_ops,
 },
 { /* Voice via BT */
 	.name = "Bluetooth",
 	.stream_name = "Voice",
 	.platform_name = "s3c24xx-pcm-audio",
 	.cpu_dai_name = "bluetooth-dai",
 	.codec_dai_name = "wm8753-voice",
 	.codec_name = "wm8753-codec.0-0x1a",
 	.ops = &neo1973_voice_ops,
 },
 };

 static struct snd_soc_card neo1973 = {
 	.name = "neo1973",
 	.dai_link = neo1973_dai,
 	.num_links = ARRAY_SIZE(neo1973_dai),
 };

 static int lm4857_i2c_probe(struct i2c_client *client,
 			    const struct i2c_device_id *id)
 {
 	pr_debug("Entered %s\n", __func__);

 	i2c = client;

 	lm4857_write_regs();
 	return 0;
 }

 static int lm4857_i2c_remove(struct i2c_client *client)
 {
 	pr_debug("Entered %s\n", __func__);

 	i2c = NULL;

 	return 0;
 }

 static u8 lm4857_state;

 static int lm4857_suspend(struct i2c_client *dev, pm_message_t state)
 {
 	pr_debug("Entered %s\n", __func__);

 	dev_dbg(&dev->dev, "lm4857_suspend\n");
 	lm4857_state = lm4857_regs[LM4857_CTRL] & 0xf;
 	if (lm4857_state) {
 		lm4857_regs[LM4857_CTRL] &= 0xf0;
 		lm4857_write_regs();
 	}
 	return 0;
 }

 static int lm4857_resume(struct i2c_client *dev)
 {
 	pr_debug("Entered %s\n", __func__);

 	if (lm4857_state) {
 		lm4857_regs[LM4857_CTRL] |= (lm4857_state & 0x0f);
 		lm4857_write_regs();
 	}
 	return 0;
 }

 static void lm4857_shutdown(struct i2c_client *dev)
 {
 	pr_debug("Entered %s\n", __func__);

 	dev_dbg(&dev->dev, "lm4857_shutdown\n");
 	lm4857_regs[LM4857_CTRL] &= 0xf0;
 	lm4857_write_regs();
 }

 static const struct i2c_device_id lm4857_i2c_id[] = {
 	{ "neo1973_lm4857", 0 },
 	{ }
 };

 static struct i2c_driver lm4857_i2c_driver = {
 	.driver = {
 		.name = "LM4857 I2C Amp",
 		.owner = THIS_MODULE,
 	},
 	.suspend =        lm4857_suspend,
 	.resume	=         lm4857_resume,
 	.shutdown =       lm4857_shutdown,
 	.probe =          lm4857_i2c_probe,
 	.remove =         lm4857_i2c_remove,
 	.id_table =       lm4857_i2c_id,
 };

 static struct platform_device *neo1973_snd_device;

 static int __init neo1973_init(void)
 {
 	int ret;

 	pr_debug("Entered %s\n", __func__);

 	if (!machine_is_neo1973_gta01()) {
 		printk(KERN_INFO
 			"Only GTA01 hardware supported by ASoC driver\n");
 		return -ENODEV;
 	}

 	neo1973_snd_device = platform_device_alloc("soc-audio", -1);
 	if (!neo1973_snd_device)
 		return -ENOMEM;

 	platform_set_drvdata(neo1973_snd_device, &neo1973);
 	ret = platform_device_add(neo1973_snd_device);

 	if (ret) {
 		platform_device_put(neo1973_snd_device);
 		return ret;
 	}

 	ret = i2c_add_driver(&lm4857_i2c_driver);

 	if (ret != 0)
 		platform_device_unregister(neo1973_snd_device);

 	return ret;
 }

 static void __exit neo1973_exit(void)
 {
 	pr_debug("Entered %s\n", __func__);

 	i2c_del_driver(&lm4857_i2c_driver);
 	platform_device_unregister(neo1973_snd_device);
 }

 module_init(neo1973_init);
 module_exit(neo1973_exit);

 /* Module information */
 MODULE_AUTHOR("Graeme Gregory, graeme@openmoko.org, www.openmoko.org");
 MODULE_DESCRIPTION("ALSA SoC WM8753 Neo1973");
 MODULE_LICENSE("GPL");
	/*
	* 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.
	*
	*/

	#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/core.h>
	#include <sound/pcm.h>
	#include <sound/soc.h>
	#include <sound/soc-dapm.h>
	#include <sound/tlv.h>

	#include <asm/mach-types.h>
	#include <asm/hardware/scoop.h>
	#include <mach/regs-clock.h>
	#include <mach/regs-gpio.h>
	#include <mach/hardware.h>
	#include <linux/io.h>
	#include <mach/spi-gpio.h>

	#include <plat/regs-iis.h>

	#include "../codecs/wm8753.h"
	#include "lm4857.h"
	#include "s3c-dma.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_card 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_dai *codec_dai = rtd->codec_dai;
	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
	unsigned int pll_out = 0, bclk = 0;
	int ret = 0;
	unsigned long iis_clkrate;

	pr_debug("Entered %s\n", __func__);

	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 = snd_soc_dai_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 = snd_soc_dai_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 = snd_soc_dai_set_sysclk(codec_dai, WM8753_MCLK, pll_out,
	SND_SOC_CLOCK_IN);
	if (ret < 0)
	return ret;

	/* set MCLK division for sample rate */
	ret = snd_soc_dai_set_clkdiv(cpu_dai, S3C24XX_DIV_MCLK,
	S3C2410_IISMOD_32FS);
	if (ret < 0)
	return ret;

	/* set codec BCLK division for sample rate */
	ret = snd_soc_dai_set_clkdiv(codec_dai, WM8753_BCLKDIV, bclk);
	if (ret < 0)
	return ret;

	/* set prescaler division for sample rate */
	ret = snd_soc_dai_set_clkdiv(cpu_dai, S3C24XX_DIV_PRESCALER,
	S3C24XX_PRESCALE(4, 4));
	if (ret < 0)
	return ret;

	/* codec PLL input is PCLK/4 */
	ret = snd_soc_dai_set_pll(codec_dai, WM8753_PLL1, 0,
	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_dai *codec_dai = rtd->codec_dai;

	pr_debug("Entered %s\n", __func__);

	/* disable the PLL */
	return snd_soc_dai_set_pll(codec_dai, WM8753_PLL1, 0, 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_dai *codec_dai = rtd->codec_dai;
	unsigned int pcmdiv = 0;
	int ret = 0;
	unsigned long iis_clkrate;

	pr_debug("Entered %s\n", __func__);

	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 = snd_soc_dai_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 = snd_soc_dai_set_sysclk(codec_dai, WM8753_PCMCLK, 12288000,
	SND_SOC_CLOCK_IN);
	if (ret < 0)
	return ret;

	/* set codec PCM division for sample rate */
	ret = snd_soc_dai_set_clkdiv(codec_dai, WM8753_PCMDIV, pcmdiv);
	if (ret < 0)
	return ret;

	/* configure and enable PLL for 12.288MHz output */
	ret = snd_soc_dai_set_pll(codec_dai, WM8753_PLL2, 0,
	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_dai *codec_dai = rtd->codec_dai;

	pr_debug("Entered %s\n", __func__);

	/* disable the PLL */
	return snd_soc_dai_set_pll(codec_dai, WM8753_PLL2, 0, 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;

	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)
	{
	pr_debug("Entered %s\n", __func__);

	switch (neo1973_scenario) {
	case NEO_AUDIO_OFF:
	snd_soc_dapm_disable_pin(codec, "Audio Out");
	snd_soc_dapm_disable_pin(codec, "GSM Line Out");
	snd_soc_dapm_disable_pin(codec, "GSM Line In");
	snd_soc_dapm_disable_pin(codec, "Headset Mic");
	snd_soc_dapm_disable_pin(codec, "Call Mic");
	break;
	case NEO_GSM_CALL_AUDIO_HANDSET:
	snd_soc_dapm_enable_pin(codec, "Audio Out");
	snd_soc_dapm_enable_pin(codec, "GSM Line Out");
	snd_soc_dapm_enable_pin(codec, "GSM Line In");
	snd_soc_dapm_disable_pin(codec, "Headset Mic");
	snd_soc_dapm_enable_pin(codec, "Call Mic");
	break;
	case NEO_GSM_CALL_AUDIO_HEADSET:
	snd_soc_dapm_enable_pin(codec, "Audio Out");
	snd_soc_dapm_enable_pin(codec, "GSM Line Out");
	snd_soc_dapm_enable_pin(codec, "GSM Line In");
	snd_soc_dapm_enable_pin(codec, "Headset Mic");
	snd_soc_dapm_disable_pin(codec, "Call Mic");
	break;
	case NEO_GSM_CALL_AUDIO_BLUETOOTH:
	snd_soc_dapm_disable_pin(codec, "Audio Out");
	snd_soc_dapm_enable_pin(codec, "GSM Line Out");
	snd_soc_dapm_enable_pin(codec, "GSM Line In");
	snd_soc_dapm_disable_pin(codec, "Headset Mic");
	snd_soc_dapm_disable_pin(codec, "Call Mic");
	break;
	case NEO_STEREO_TO_SPEAKERS:
	snd_soc_dapm_enable_pin(codec, "Audio Out");
	snd_soc_dapm_disable_pin(codec, "GSM Line Out");
	snd_soc_dapm_disable_pin(codec, "GSM Line In");
	snd_soc_dapm_disable_pin(codec, "Headset Mic");
	snd_soc_dapm_disable_pin(codec, "Call Mic");
	break;
	case NEO_STEREO_TO_HEADPHONES:
	snd_soc_dapm_enable_pin(codec, "Audio Out");
	snd_soc_dapm_disable_pin(codec, "GSM Line Out");
	snd_soc_dapm_disable_pin(codec, "GSM Line In");
	snd_soc_dapm_disable_pin(codec, "Headset Mic");
	snd_soc_dapm_disable_pin(codec, "Call Mic");
	break;
	case NEO_CAPTURE_HANDSET:
	snd_soc_dapm_disable_pin(codec, "Audio Out");
	snd_soc_dapm_disable_pin(codec, "GSM Line Out");
	snd_soc_dapm_disable_pin(codec, "GSM Line In");
	snd_soc_dapm_disable_pin(codec, "Headset Mic");
	snd_soc_dapm_enable_pin(codec, "Call Mic");
	break;
	case NEO_CAPTURE_HEADSET:
	snd_soc_dapm_disable_pin(codec, "Audio Out");
	snd_soc_dapm_disable_pin(codec, "GSM Line Out");
	snd_soc_dapm_disable_pin(codec, "GSM Line In");
	snd_soc_dapm_enable_pin(codec, "Headset Mic");
	snd_soc_dapm_disable_pin(codec, "Call Mic");
	break;
	case NEO_CAPTURE_BLUETOOTH:
	snd_soc_dapm_disable_pin(codec, "Audio Out");
	snd_soc_dapm_disable_pin(codec, "GSM Line Out");
	snd_soc_dapm_disable_pin(codec, "GSM Line In");
	snd_soc_dapm_disable_pin(codec, "Headset Mic");
	snd_soc_dapm_disable_pin(codec, "Call Mic");
	break;
	default:
	snd_soc_dapm_disable_pin(codec, "Audio Out");
	snd_soc_dapm_disable_pin(codec, "GSM Line Out");
	snd_soc_dapm_disable_pin(codec, "GSM Line In");
	snd_soc_dapm_disable_pin(codec, "Headset Mic");
	snd_soc_dapm_disable_pin(codec, "Call Mic");
	}

	snd_soc_dapm_sync(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);

	pr_debug("Entered %s\n", __func__);

	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)
	{
	pr_debug("Entered %s\n", __func__);

	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)
	{
	struct soc_mixer_control *mc =
	(struct soc_mixer_control *)kcontrol->private_value;
	int reg = mc->reg;
	int shift = mc->shift;
	int mask = mc->max;

	pr_debug("Entered %s\n", __func__);

	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)
	{
	struct soc_mixer_control *mc =
	(struct soc_mixer_control *)kcontrol->private_value;
	int reg = mc->reg;
	int shift = mc->shift;
	int mask = mc->max;

	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;

	pr_debug("Entered %s\n", __func__);

	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];

	pr_debug("Entered %s\n", __func__);

	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),
	};


	static const struct snd_soc_dapm_route dapm_routes[] = {

	/* 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"},
	};

	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 DECLARE_TLV_DB_SCALE(stereo_tlv, -4050, 150, 0);
	static const DECLARE_TLV_DB_SCALE(mono_tlv, -3450, 150, 0);

	static const struct snd_kcontrol_new wm8753_neo1973_controls[] = {
	SOC_SINGLE_EXT_TLV("Amp Left Playback Volume", LM4857_LVOL, 0, 31, 0,
	lm4857_get_reg, lm4857_set_reg, stereo_tlv),
	SOC_SINGLE_EXT_TLV("Amp Right Playback Volume", LM4857_RVOL, 0, 31, 0,
	lm4857_get_reg, lm4857_set_reg, stereo_tlv),
	SOC_SINGLE_EXT_TLV("Amp Mono Playback Volume", LM4857_MVOL, 0, 31, 0,
	lm4857_get_reg, lm4857_set_reg, mono_tlv),
	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_pcm_runtime *rtd)
	{
	struct snd_soc_codec *codec = rtd->codec;
	int err;

	pr_debug("Entered %s\n", __func__);

	/* set up NC codec pins */
	snd_soc_dapm_nc_pin(codec, "LOUT2");
	snd_soc_dapm_nc_pin(codec, "ROUT2");
	snd_soc_dapm_nc_pin(codec, "OUT3");
	snd_soc_dapm_nc_pin(codec, "OUT4");
	snd_soc_dapm_nc_pin(codec, "LINE1");
	snd_soc_dapm_nc_pin(codec, "LINE2");

	/* Add neo1973 specific widgets */
	snd_soc_dapm_new_controls(codec, wm8753_dapm_widgets,
	ARRAY_SIZE(wm8753_dapm_widgets));

	/* set endpoints to default mode */
	set_scenario_endpoints(codec, NEO_AUDIO_OFF);

	/* add neo1973 specific controls */
	err = snd_soc_add_controls(codec, wm8753_neo1973_controls,
	ARRAY_SIZE(8753_neo1973_controls));
	if (err < 0)
	return err;

	/* set up neo1973 specific audio routes */
	err = snd_soc_dapm_add_routes(codec, dapm_routes,
	ARRAY_SIZE(dapm_routes));

	snd_soc_dapm_sync(codec);
	return 0;
	}

	/*
	* BT Codec DAI
	*/
	static struct snd_soc_dai bt_dai = {
	.name = "bluetooth-dai",
	.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",
	.platform_name = "s3c24xx-pcm-audio",
	.cpu_dai_name = "s3c24xx-i2s",
	.codec_dai_name = "wm8753-hifi",
	.codec_name = "wm8753-codec.0-0x1a",
	.init = neo1973_wm8753_init,
	.ops = &neo1973_hifi_ops,
	},
	{ /* Voice via BT */
	.name = "Bluetooth",
	.stream_name = "Voice",
	.platform_name = "s3c24xx-pcm-audio",
	.cpu_dai_name = "bluetooth-dai",
	.codec_dai_name = "wm8753-voice",
	.codec_name = "wm8753-codec.0-0x1a",
	.ops = &neo1973_voice_ops,
	},
	};

	static struct snd_soc_card neo1973 = {
	.name = "neo1973",
	.dai_link = neo1973_dai,
	.num_links = ARRAY_SIZE(neo1973_dai),
	};

	static int lm4857_i2c_probe(struct i2c_client *client,
	const struct i2c_device_id *id)
	{
	pr_debug("Entered %s\n", __func__);

	i2c = client;

	lm4857_write_regs();
	return 0;
	}

	static int lm4857_i2c_remove(struct i2c_client *client)
	{
	pr_debug("Entered %s\n", __func__);

	i2c = NULL;

	return 0;
	}

	static u8 lm4857_state;

	static int lm4857_suspend(struct i2c_client *dev, pm_message_t state)
	{
	pr_debug("Entered %s\n", __func__);

	dev_dbg(&dev->dev, "lm4857_suspend\n");
	lm4857_state = lm4857_regs[LM4857_CTRL] & 0xf;
	if (lm4857_state) {
	lm4857_regs[LM4857_CTRL] &= 0xf0;
	lm4857_write_regs();
	}
	return 0;
	}

	static int lm4857_resume(struct i2c_client *dev)
	{
	pr_debug("Entered %s\n", __func__);

	if (lm4857_state) {
	lm4857_regs[LM4857_CTRL] \|= (lm4857_state & 0x0f);
	lm4857_write_regs();
	}
	return 0;
	}

	static void lm4857_shutdown(struct i2c_client *dev)
	{
	pr_debug("Entered %s\n", __func__);

	dev_dbg(&dev->dev, "lm4857_shutdown\n");
	lm4857_regs[LM4857_CTRL] &= 0xf0;
	lm4857_write_regs();
	}

	static const struct i2c_device_id lm4857_i2c_id[] = {
	{ "neo1973_lm4857", 0 },
	{ }
	};

	static struct i2c_driver lm4857_i2c_driver = {
	.driver = {
	.name = "LM4857 I2C Amp",
	.owner = THIS_MODULE,
	},
	.suspend = lm4857_suspend,
	.resume = lm4857_resume,
	.shutdown = lm4857_shutdown,
	.probe = lm4857_i2c_probe,
	.remove = lm4857_i2c_remove,
	.id_table = lm4857_i2c_id,
	};

	static struct platform_device *neo1973_snd_device;

	static int __init neo1973_init(void)
	{
	int ret;

	pr_debug("Entered %s\n", __func__);

	if (!machine_is_neo1973_gta01()) {
	printk(KERN_INFO
	"Only GTA01 hardware supported by ASoC driver\n");
	return -ENODEV;
	}

	neo1973_snd_device = platform_device_alloc("soc-audio", -1);
	if (!neo1973_snd_device)
	return -ENOMEM;

	platform_set_drvdata(neo1973_snd_device, &neo1973);
	ret = platform_device_add(neo1973_snd_device);

	if (ret) {
	platform_device_put(neo1973_snd_device);
	return ret;
	}

	ret = i2c_add_driver(&lm4857_i2c_driver);

	if (ret != 0)
	platform_device_unregister(neo1973_snd_device);

	return ret;
	}

	static void __exit neo1973_exit(void)
	{
	pr_debug("Entered %s\n", __func__);

	i2c_del_driver(&lm4857_i2c_driver);
	platform_device_unregister(neo1973_snd_device);
	}

	module_init(neo1973_init);
	module_exit(neo1973_exit);

	/* Module information */
	MODULE_AUTHOR("Graeme Gregory, graeme@openmoko.org, www.openmoko.org");
	MODULE_DESCRIPTION("ALSA SoC WM8753 Neo1973");
	MODULE_LICENSE("GPL");