sound/soc/s3c24xx/neo1973_gta02_wm8753.c - kernel/prism - Git at Google

 /*
  * neo1973_gta02_wm8753.c  --  SoC audio for Openmoko Freerunner(GTA02)
  *
  * Copyright 2007 Openmoko Inc
  * Author: Graeme Gregory <graeme@openmoko.org>
  * Copyright 2007 Wolfson Microelectronics PLC.
  * Author: Graeme Gregory <linux@wolfsonmicro.com>
  * Copyright 2009 Wolfson Microelectronics
  *
  *  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/gpio.h>
 #include <sound/core.h>
 #include <sound/pcm.h>
 #include <sound/soc.h>
 #include <sound/soc-dapm.h>

 #include <asm/mach-types.h>

 #include <plat/regs-iis.h>

 #include <mach/regs-clock.h>
 #include <asm/io.h>
 #include <mach/gta02.h>
 #include "../codecs/wm8753.h"
 #include "s3c24xx-pcm.h"
 #include "s3c24xx-i2s.h"

 static struct snd_soc_card neo1973_gta02;

 static int neo1973_gta02_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->dai->codec_dai;
 	struct snd_soc_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 = 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,
 		iis_clkrate / 4, pll_out);
 	if (ret < 0)
 		return ret;

 	return 0;
 }

 static int neo1973_gta02_hifi_hw_free(struct snd_pcm_substream *substream)
 {
 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
 	struct snd_soc_dai *codec_dai = rtd->dai->codec_dai;

 	/* disable the PLL */
 	return snd_soc_dai_set_pll(codec_dai, WM8753_PLL1, 0, 0);
 }

 /*
  * Neo1973 WM8753 HiFi DAI opserations.
  */
 static struct snd_soc_ops neo1973_gta02_hifi_ops = {
 	.hw_params = neo1973_gta02_hifi_hw_params,
 	.hw_free = neo1973_gta02_hifi_hw_free,
 };

 static int neo1973_gta02_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->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 = 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;

 	/* configue and enable PLL for 12.288MHz output */
 	ret = snd_soc_dai_set_pll(codec_dai, WM8753_PLL2,
 		iis_clkrate / 4, 12288000);
 	if (ret < 0)
 		return ret;

 	return 0;
 }

 static int neo1973_gta02_voice_hw_free(struct snd_pcm_substream *substream)
 {
 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
 	struct snd_soc_dai *codec_dai = rtd->dai->codec_dai;

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

 static struct snd_soc_ops neo1973_gta02_voice_ops = {
 	.hw_params = neo1973_gta02_voice_hw_params,
 	.hw_free = neo1973_gta02_voice_hw_free,
 };

 #define LM4853_AMP 1
 #define LM4853_SPK 2

 static u8 lm4853_state;

 /* This has no effect, it exists only to maintain compatibility with
  * existing ALSA state files.
  */
 static int lm4853_set_state(struct snd_kcontrol *kcontrol,
 	struct snd_ctl_elem_value *ucontrol)
 {
 	int val = ucontrol->value.integer.value[0];

 	if (val)
 		lm4853_state |= LM4853_AMP;
 	else
 		lm4853_state &= ~LM4853_AMP;

 	return 0;
 }

 static int lm4853_get_state(struct snd_kcontrol *kcontrol,
 	struct snd_ctl_elem_value *ucontrol)
 {
 	ucontrol->value.integer.value[0] = lm4853_state & LM4853_AMP;

 	return 0;
 }

 static int lm4853_set_spk(struct snd_kcontrol *kcontrol,
 	struct snd_ctl_elem_value *ucontrol)
 {
 	int val = ucontrol->value.integer.value[0];

 	if (val) {
 		lm4853_state |= LM4853_SPK;
 		gpio_set_value(GTA02_GPIO_HP_IN, 0);
 	} else {
 		lm4853_state &= ~LM4853_SPK;
 		gpio_set_value(GTA02_GPIO_HP_IN, 1);
 	}

 	return 0;
 }

 static int lm4853_get_spk(struct snd_kcontrol *kcontrol,
 	struct snd_ctl_elem_value *ucontrol)
 {
 	ucontrol->value.integer.value[0] = (lm4853_state & LM4853_SPK) >> 1;

 	return 0;
 }

 static int lm4853_event(struct snd_soc_dapm_widget *w,
 			struct snd_kcontrol *k,
 			int event)
 {
 	gpio_set_value(GTA02_GPIO_AMP_SHUT, SND_SOC_DAPM_EVENT_OFF(value));

 	return 0;
 }

 static const struct snd_soc_dapm_widget wm8753_dapm_widgets[] = {
 	SND_SOC_DAPM_SPK("Stereo Out", lm4853_event),
 	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("Handset Mic", NULL),
 	SND_SOC_DAPM_SPK("Handset Spk", NULL),
 };


 /* example machine audio_mapnections */
 static const struct snd_soc_dapm_route audio_map[] = {

 	/* Connections to the lm4853 amp */
 	{"Stereo Out", NULL, "LOUT1"},
 	{"Stereo 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, "Handset Mic"},

 	/* Call Speaker */
 	{"Handset Spk", NULL, "LOUT2"},
 	{"Handset Spk", NULL, "ROUT2"},

 	/* Connect the ALC pins */
 	{"ACIN", NULL, "ACOP"},
 };

 static const struct snd_kcontrol_new wm8753_neo1973_gta02_controls[] = {
 	SOC_DAPM_PIN_SWITCH("Stereo Out"),
 	SOC_DAPM_PIN_SWITCH("GSM Line Out"),
 	SOC_DAPM_PIN_SWITCH("GSM Line In"),
 	SOC_DAPM_PIN_SWITCH("Headset Mic"),
 	SOC_DAPM_PIN_SWITCH("Handset Mic"),
 	SOC_DAPM_PIN_SWITCH("Handset Spk"),

 	/* This has no effect, it exists only to maintain compatibility with
 	 * existing ALSA state files.
 	 */
 	SOC_SINGLE_EXT("Amp State Switch", 6, 0, 1, 0,
 		lm4853_get_state,
 		lm4853_set_state),
 	SOC_SINGLE_EXT("Amp Spk Switch", 7, 0, 1, 0,
 		lm4853_get_spk,
 		lm4853_set_spk),
 };

 /*
  * This is an example machine initialisation for a wm8753 connected to a
  * neo1973 GTA02.
  */
 static int neo1973_gta02_wm8753_init(struct snd_soc_codec *codec)
 {
 	int err;

 	/* set up NC codec pins */
 	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 gta02 specific widgets */
 	snd_soc_dapm_new_controls(codec, wm8753_dapm_widgets,
 				  ARRAY_SIZE(wm8753_dapm_widgets));

 	/* add neo1973 gta02 specific controls */
 	err = snd_soc_add_controls(codec, wm8753_neo1973_gta02_controls,
 		ARRAY_SIZE(wm8753_neo1973_gta02_controls));

 	if (err < 0)
 		return err;

 	/* set up neo1973 gta02 specific audio path audio_map */
 	snd_soc_dapm_add_routes(codec, audio_map, ARRAY_SIZE(audio_map));

 	/* set endpoints to default off mode */
 	snd_soc_dapm_disable_pin(codec, "Stereo 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, "Handset Mic");
 	snd_soc_dapm_disable_pin(codec, "Handset Spk");

 	snd_soc_dapm_sync(codec);

 	return 0;
 }

 /*
  * BT Codec DAI
  */
 static struct snd_soc_dai bt_dai = {
 	.name = "Bluetooth",
 	.id = 0,
 	.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_gta02_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_gta02_wm8753_init,
 	.ops = &neo1973_gta02_hifi_ops,
 },
 { /* Voice via BT */
 	.name = "Bluetooth",
 	.stream_name = "Voice",
 	.cpu_dai = &bt_dai,
 	.codec_dai = &wm8753_dai[WM8753_DAI_VOICE],
 	.ops = &neo1973_gta02_voice_ops,
 },
 };

 static struct snd_soc_card neo1973_gta02 = {
 	.name = "neo1973-gta02",
 	.platform = &s3c24xx_soc_platform,
 	.dai_link = neo1973_gta02_dai,
 	.num_links = ARRAY_SIZE(neo1973_gta02_dai),
 };

 static struct snd_soc_device neo1973_gta02_snd_devdata = {
 	.card = &neo1973_gta02,
 	.codec_dev = &soc_codec_dev_wm8753,
 };

 static struct platform_device *neo1973_gta02_snd_device;

 static int __init neo1973_gta02_init(void)
 {
 	int ret;

 	if (!machine_is_neo1973_gta02()) {
 		printk(KERN_INFO
 		       "Only GTA02 is supported by this ASoC driver\n");
 		return -ENODEV;
 	}

 	/* register bluetooth DAI here */
 	ret = snd_soc_register_dai(&bt_dai);
 	if (ret)
 		return ret;

 	neo1973_gta02_snd_device = platform_device_alloc("soc-audio", -1);
 	if (!neo1973_gta02_snd_device)
 		return -ENOMEM;

 	platform_set_drvdata(neo1973_gta02_snd_device,
 			&neo1973_gta02_snd_devdata);
 	neo1973_gta02_snd_devdata.dev = &neo1973_gta02_snd_device->dev;
 	ret = platform_device_add(neo1973_gta02_snd_device);

 	if (ret) {
 		platform_device_put(neo1973_gta02_snd_device);
 		return ret;
 	}

 	/* Initialise GPIOs used by amp */
 	ret = gpio_request(GTA02_GPIO_HP_IN, "GTA02_HP_IN");
 	if (ret) {
 		pr_err("gta02_wm8753: Failed to register GPIO %d\n", GTA02_GPIO_HP_IN);
 		goto err_unregister_device;
 	}

 	ret = gpio_direction_output(GTA02_GPIO_AMP_HP_IN, 1);
 	if (ret) {
 		pr_err("gta02_wm8753: Failed to configure GPIO %d\n", GTA02_GPIO_HP_IN);
 		goto err_free_gpio_hp_in;
 	}

 	ret = gpio_request(GTA02_GPIO_AMP_SHUT, "GTA02_AMP_SHUT");
 	if (ret) {
 		pr_err("gta02_wm8753: Failed to register GPIO %d\n", GTA02_GPIO_AMP_SHUT);
 		goto err_free_gpio_hp_in;
 	}

 	ret = gpio_direction_output(GTA02_GPIO_AMP_SHUT, 1);
 	if (ret) {
 		pr_err("gta02_wm8753: Failed to configure GPIO %d\n", GTA02_GPIO_AMP_SHUT);
 		goto err_free_gpio_amp_shut;
 	}

 	return 0;

 err_free_gpio_amp_shut:
 	gpio_free(GTA02_GPIO_AMP_SHUT);
 err_free_gpio_hp_in:
 	gpio_free(GTA02_GPIO_HP_IN);
 err_unregister_device:
 	platform_device_unregister(neo1973_gta02_snd_device);
 	return ret;
 }
 module_init(neo1973_gta02_init);

 static void __exit neo1973_gta02_exit(void)
 {
 	snd_soc_unregister_dai(&bt_dai);
 	platform_device_unregister(neo1973_gta02_snd_device);
 	gpio_free(GTA02_GPIO_HP_IN);
 	gpio_free(GTA02_GPIO_AMP_SHUT);
 }
 module_exit(neo1973_gta02_exit);

 /* Module information */
 MODULE_AUTHOR("Graeme Gregory, graeme@openmoko.org");
 MODULE_DESCRIPTION("ALSA SoC WM8753 Neo1973 GTA02");
 MODULE_LICENSE("GPL");
	/*
	* neo1973_gta02_wm8753.c -- SoC audio for Openmoko Freerunner(GTA02)
	*
	* Copyright 2007 Openmoko Inc
	* Author: Graeme Gregory <graeme@openmoko.org>
	* Copyright 2007 Wolfson Microelectronics PLC.
	* Author: Graeme Gregory <linux@wolfsonmicro.com>
	* Copyright 2009 Wolfson Microelectronics
	*
	* 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/gpio.h>
	#include <sound/core.h>
	#include <sound/pcm.h>
	#include <sound/soc.h>
	#include <sound/soc-dapm.h>

	#include <asm/mach-types.h>

	#include <plat/regs-iis.h>

	#include <mach/regs-clock.h>
	#include <asm/io.h>
	#include <mach/gta02.h>
	#include "../codecs/wm8753.h"
	#include "s3c24xx-pcm.h"
	#include "s3c24xx-i2s.h"

	static struct snd_soc_card neo1973_gta02;

	static int neo1973_gta02_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->dai->codec_dai;
	struct snd_soc_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 = 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,
	iis_clkrate / 4, pll_out);
	if (ret < 0)
	return ret;

	return 0;
	}

	static int neo1973_gta02_hifi_hw_free(struct snd_pcm_substream *substream)
	{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_dai *codec_dai = rtd->dai->codec_dai;

	/* disable the PLL */
	return snd_soc_dai_set_pll(codec_dai, WM8753_PLL1, 0, 0);
	}

	/*
	* Neo1973 WM8753 HiFi DAI opserations.
	*/
	static struct snd_soc_ops neo1973_gta02_hifi_ops = {
	.hw_params = neo1973_gta02_hifi_hw_params,
	.hw_free = neo1973_gta02_hifi_hw_free,
	};

	static int neo1973_gta02_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->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 = 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;

	/* configue and enable PLL for 12.288MHz output */
	ret = snd_soc_dai_set_pll(codec_dai, WM8753_PLL2,
	iis_clkrate / 4, 12288000);
	if (ret < 0)
	return ret;

	return 0;
	}

	static int neo1973_gta02_voice_hw_free(struct snd_pcm_substream *substream)
	{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_dai *codec_dai = rtd->dai->codec_dai;

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

	static struct snd_soc_ops neo1973_gta02_voice_ops = {
	.hw_params = neo1973_gta02_voice_hw_params,
	.hw_free = neo1973_gta02_voice_hw_free,
	};

	#define LM4853_AMP 1
	#define LM4853_SPK 2

	static u8 lm4853_state;

	/* This has no effect, it exists only to maintain compatibility with
	* existing ALSA state files.
	*/
	static int lm4853_set_state(struct snd_kcontrol *kcontrol,
	struct snd_ctl_elem_value *ucontrol)
	{
	int val = ucontrol->value.integer.value[0];

	if (val)
	lm4853_state \|= LM4853_AMP;
	else
	lm4853_state &= ~LM4853_AMP;

	return 0;
	}

	static int lm4853_get_state(struct snd_kcontrol *kcontrol,
	struct snd_ctl_elem_value *ucontrol)
	{
	ucontrol->value.integer.value[0] = lm4853_state & LM4853_AMP;

	return 0;
	}

	static int lm4853_set_spk(struct snd_kcontrol *kcontrol,
	struct snd_ctl_elem_value *ucontrol)
	{
	int val = ucontrol->value.integer.value[0];

	if (val) {
	lm4853_state \|= LM4853_SPK;
	gpio_set_value(GTA02_GPIO_HP_IN, 0);
	} else {
	lm4853_state &= ~LM4853_SPK;
	gpio_set_value(GTA02_GPIO_HP_IN, 1);
	}

	return 0;
	}

	static int lm4853_get_spk(struct snd_kcontrol *kcontrol,
	struct snd_ctl_elem_value *ucontrol)
	{
	ucontrol->value.integer.value[0] = (lm4853_state & LM4853_SPK) >> 1;

	return 0;
	}

	static int lm4853_event(struct snd_soc_dapm_widget *w,
	struct snd_kcontrol *k,
	int event)
	{
	gpio_set_value(GTA02_GPIO_AMP_SHUT, SND_SOC_DAPM_EVENT_OFF(value));

	return 0;
	}

	static const struct snd_soc_dapm_widget wm8753_dapm_widgets[] = {
	SND_SOC_DAPM_SPK("Stereo Out", lm4853_event),
	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("Handset Mic", NULL),
	SND_SOC_DAPM_SPK("Handset Spk", NULL),
	};


	/* example machine audio_mapnections */
	static const struct snd_soc_dapm_route audio_map[] = {

	/* Connections to the lm4853 amp */
	{"Stereo Out", NULL, "LOUT1"},
	{"Stereo 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, "Handset Mic"},

	/* Call Speaker */
	{"Handset Spk", NULL, "LOUT2"},
	{"Handset Spk", NULL, "ROUT2"},

	/* Connect the ALC pins */
	{"ACIN", NULL, "ACOP"},
	};

	static const struct snd_kcontrol_new wm8753_neo1973_gta02_controls[] = {
	SOC_DAPM_PIN_SWITCH("Stereo Out"),
	SOC_DAPM_PIN_SWITCH("GSM Line Out"),
	SOC_DAPM_PIN_SWITCH("GSM Line In"),
	SOC_DAPM_PIN_SWITCH("Headset Mic"),
	SOC_DAPM_PIN_SWITCH("Handset Mic"),
	SOC_DAPM_PIN_SWITCH("Handset Spk"),

	/* This has no effect, it exists only to maintain compatibility with
	* existing ALSA state files.
	*/
	SOC_SINGLE_EXT("Amp State Switch", 6, 0, 1, 0,
	lm4853_get_state,
	lm4853_set_state),
	SOC_SINGLE_EXT("Amp Spk Switch", 7, 0, 1, 0,
	lm4853_get_spk,
	lm4853_set_spk),
	};

	/*
	* This is an example machine initialisation for a wm8753 connected to a
	* neo1973 GTA02.
	*/
	static int neo1973_gta02_wm8753_init(struct snd_soc_codec *codec)
	{
	int err;

	/* set up NC codec pins */
	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 gta02 specific widgets */
	snd_soc_dapm_new_controls(codec, wm8753_dapm_widgets,
	ARRAY_SIZE(wm8753_dapm_widgets));

	/* add neo1973 gta02 specific controls */
	err = snd_soc_add_controls(codec, wm8753_neo1973_gta02_controls,
	ARRAY_SIZE(wm8753_neo1973_gta02_controls));

	if (err < 0)
	return err;

	/* set up neo1973 gta02 specific audio path audio_map */
	snd_soc_dapm_add_routes(codec, audio_map, ARRAY_SIZE(audio_map));

	/* set endpoints to default off mode */
	snd_soc_dapm_disable_pin(codec, "Stereo 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, "Handset Mic");
	snd_soc_dapm_disable_pin(codec, "Handset Spk");

	snd_soc_dapm_sync(codec);

	return 0;
	}

	/*
	* BT Codec DAI
	*/
	static struct snd_soc_dai bt_dai = {
	.name = "Bluetooth",
	.id = 0,
	.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_gta02_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_gta02_wm8753_init,
	.ops = &neo1973_gta02_hifi_ops,
	},
	{ /* Voice via BT */
	.name = "Bluetooth",
	.stream_name = "Voice",
	.cpu_dai = &bt_dai,
	.codec_dai = &wm8753_dai[WM8753_DAI_VOICE],
	.ops = &neo1973_gta02_voice_ops,
	},
	};

	static struct snd_soc_card neo1973_gta02 = {
	.name = "neo1973-gta02",
	.platform = &s3c24xx_soc_platform,
	.dai_link = neo1973_gta02_dai,
	.num_links = ARRAY_SIZE(neo1973_gta02_dai),
	};

	static struct snd_soc_device neo1973_gta02_snd_devdata = {
	.card = &neo1973_gta02,
	.codec_dev = &soc_codec_dev_wm8753,
	};

	static struct platform_device *neo1973_gta02_snd_device;

	static int __init neo1973_gta02_init(void)
	{
	int ret;

	if (!machine_is_neo1973_gta02()) {
	printk(KERN_INFO
	"Only GTA02 is supported by this ASoC driver\n");
	return -ENODEV;
	}

	/* register bluetooth DAI here */
	ret = snd_soc_register_dai(&bt_dai);
	if (ret)
	return ret;

	neo1973_gta02_snd_device = platform_device_alloc("soc-audio", -1);
	if (!neo1973_gta02_snd_device)
	return -ENOMEM;

	platform_set_drvdata(neo1973_gta02_snd_device,
	&neo1973_gta02_snd_devdata);
	neo1973_gta02_snd_devdata.dev = &neo1973_gta02_snd_device->dev;
	ret = platform_device_add(neo1973_gta02_snd_device);

	if (ret) {
	platform_device_put(neo1973_gta02_snd_device);
	return ret;
	}

	/* Initialise GPIOs used by amp */
	ret = gpio_request(GTA02_GPIO_HP_IN, "GTA02_HP_IN");
	if (ret) {
	pr_err("gta02_wm8753: Failed to register GPIO %d\n", GTA02_GPIO_HP_IN);
	goto err_unregister_device;
	}

	ret = gpio_direction_output(GTA02_GPIO_AMP_HP_IN, 1);
	if (ret) {
	pr_err("gta02_wm8753: Failed to configure GPIO %d\n", GTA02_GPIO_HP_IN);
	goto err_free_gpio_hp_in;
	}

	ret = gpio_request(GTA02_GPIO_AMP_SHUT, "GTA02_AMP_SHUT");
	if (ret) {
	pr_err("gta02_wm8753: Failed to register GPIO %d\n", GTA02_GPIO_AMP_SHUT);
	goto err_free_gpio_hp_in;
	}

	ret = gpio_direction_output(GTA02_GPIO_AMP_SHUT, 1);
	if (ret) {
	pr_err("gta02_wm8753: Failed to configure GPIO %d\n", GTA02_GPIO_AMP_SHUT);
	goto err_free_gpio_amp_shut;
	}

	return 0;

	err_free_gpio_amp_shut:
	gpio_free(GTA02_GPIO_AMP_SHUT);
	err_free_gpio_hp_in:
	gpio_free(GTA02_GPIO_HP_IN);
	err_unregister_device:
	platform_device_unregister(neo1973_gta02_snd_device);
	return ret;
	}
	module_init(neo1973_gta02_init);

	static void __exit neo1973_gta02_exit(void)
	{
	snd_soc_unregister_dai(&bt_dai);
	platform_device_unregister(neo1973_gta02_snd_device);
	gpio_free(GTA02_GPIO_HP_IN);
	gpio_free(GTA02_GPIO_AMP_SHUT);
	}
	module_exit(neo1973_gta02_exit);

	/* Module information */
	MODULE_AUTHOR("Graeme Gregory, graeme@openmoko.org");
	MODULE_DESCRIPTION("ALSA SoC WM8753 Neo1973 GTA02");
	MODULE_LICENSE("GPL");