sound/soc/codecs/wm8728.c - kernel/msm-4.19 - Gitiles

 /*
  * wm8728.c  --  WM8728 ALSA SoC Audio driver
  *
  * Copyright 2008 Wolfson Microelectronics plc
  *
  * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  */

 #include <linux/module.h>
 #include <linux/moduleparam.h>
 #include <linux/init.h>
 #include <linux/delay.h>
 #include <linux/pm.h>
 #include <linux/i2c.h>
 #include <linux/platform_device.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/soc-dapm.h>
 #include <sound/initval.h>
 #include <sound/tlv.h>

 #include "wm8728.h"

 struct snd_soc_codec_device soc_codec_dev_wm8728;

 /*
  * We can't read the WM8728 register space so we cache them instead.
  * Note that the defaults here aren't the physical defaults, we latch
  * the volume update bits, mute the output and enable infinite zero
  * detect.
  */
 static const u16 wm8728_reg_defaults[] = {
 	0x1ff,
 	0x1ff,
 	0x001,
 	0x100,
 };

 static const DECLARE_TLV_DB_SCALE(wm8728_tlv, -12750, 50, 1);

 static const struct snd_kcontrol_new wm8728_snd_controls[] = {

 SOC_DOUBLE_R_TLV("Digital Playback Volume", WM8728_DACLVOL, WM8728_DACRVOL,
 		 0, 255, 0, wm8728_tlv),

 SOC_SINGLE("Deemphasis", WM8728_DACCTL, 1, 1, 0),
 };

 /*
  * DAPM controls.
  */
 static const struct snd_soc_dapm_widget wm8728_dapm_widgets[] = {
 SND_SOC_DAPM_DAC("DAC", "HiFi Playback", SND_SOC_NOPM, 0, 0),
 SND_SOC_DAPM_OUTPUT("VOUTL"),
 SND_SOC_DAPM_OUTPUT("VOUTR"),
 };

 static const struct snd_soc_dapm_route intercon[] = {
 	{"VOUTL", NULL, "DAC"},
 	{"VOUTR", NULL, "DAC"},
 };

 static int wm8728_add_widgets(struct snd_soc_codec *codec)
 {
 	snd_soc_dapm_new_controls(codec, wm8728_dapm_widgets,
 				  ARRAY_SIZE(wm8728_dapm_widgets));

 	snd_soc_dapm_add_routes(codec, intercon, ARRAY_SIZE(intercon));

 	return 0;
 }

 static int wm8728_mute(struct snd_soc_dai *dai, int mute)
 {
 	struct snd_soc_codec *codec = dai->codec;
 	u16 mute_reg = snd_soc_read(codec, WM8728_DACCTL);

 	if (mute)
 		snd_soc_write(codec, WM8728_DACCTL, mute_reg | 1);
 	else
 		snd_soc_write(codec, WM8728_DACCTL, mute_reg & ~1);

 	return 0;
 }

 static int wm8728_hw_params(struct snd_pcm_substream *substream,
 	struct snd_pcm_hw_params *params,
 	struct snd_soc_dai *dai)
 {
 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
 	struct snd_soc_device *socdev = rtd->socdev;
 	struct snd_soc_codec *codec = socdev->card->codec;
 	u16 dac = snd_soc_read(codec, WM8728_DACCTL);

 	dac &= ~0x18;

 	switch (params_format(params)) {
 	case SNDRV_PCM_FORMAT_S16_LE:
 		break;
 	case SNDRV_PCM_FORMAT_S20_3LE:
 		dac |= 0x10;
 		break;
 	case SNDRV_PCM_FORMAT_S24_LE:
 		dac |= 0x08;
 		break;
 	default:
 		return -EINVAL;
 	}

 	snd_soc_write(codec, WM8728_DACCTL, dac);

 	return 0;
 }

 static int wm8728_set_dai_fmt(struct snd_soc_dai *codec_dai,
 		unsigned int fmt)
 {
 	struct snd_soc_codec *codec = codec_dai->codec;
 	u16 iface = snd_soc_read(codec, WM8728_IFCTL);

 	/* Currently only I2S is supported by the driver, though the
 	 * hardware is more flexible.
 	 */
 	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 	case SND_SOC_DAIFMT_I2S:
 		iface |= 1;
 		break;
 	default:
 		return -EINVAL;
 	}

 	/* The hardware only support full slave mode */
 	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 	case SND_SOC_DAIFMT_CBS_CFS:
 		break;
 	default:
 		return -EINVAL;
 	}

 	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 	case SND_SOC_DAIFMT_NB_NF:
 		iface &= ~0x22;
 		break;
 	case SND_SOC_DAIFMT_IB_NF:
 		iface |=  0x20;
 		iface &= ~0x02;
 		break;
 	case SND_SOC_DAIFMT_NB_IF:
 		iface |= 0x02;
 		iface &= ~0x20;
 		break;
 	case SND_SOC_DAIFMT_IB_IF:
 		iface |= 0x22;
 		break;
 	default:
 		return -EINVAL;
 	}

 	snd_soc_write(codec, WM8728_IFCTL, iface);
 	return 0;
 }

 static int wm8728_set_bias_level(struct snd_soc_codec *codec,
 				 enum snd_soc_bias_level level)
 {
 	u16 reg;
 	int i;

 	switch (level) {
 	case SND_SOC_BIAS_ON:
 	case SND_SOC_BIAS_PREPARE:
 	case SND_SOC_BIAS_STANDBY:
 		if (codec->bias_level == SND_SOC_BIAS_OFF) {
 			/* Power everything up... */
 			reg = snd_soc_read(codec, WM8728_DACCTL);
 			snd_soc_write(codec, WM8728_DACCTL, reg & ~0x4);

 			/* ..then sync in the register cache. */
 			for (i = 0; i < ARRAY_SIZE(wm8728_reg_defaults); i++)
 				snd_soc_write(codec, i,
 					     snd_soc_read(codec, i));
 		}
 		break;

 	case SND_SOC_BIAS_OFF:
 		reg = snd_soc_read(codec, WM8728_DACCTL);
 		snd_soc_write(codec, WM8728_DACCTL, reg | 0x4);
 		break;
 	}
 	codec->bias_level = level;
 	return 0;
 }

 #define WM8728_RATES (SNDRV_PCM_RATE_8000_192000)

 #define WM8728_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
 	SNDRV_PCM_FMTBIT_S24_LE)

 static struct snd_soc_dai_ops wm8728_dai_ops = {
 	.hw_params	= wm8728_hw_params,
 	.digital_mute	= wm8728_mute,
 	.set_fmt	= wm8728_set_dai_fmt,
 };

 struct snd_soc_dai wm8728_dai = {
 	.name = "WM8728",
 	.playback = {
 		.stream_name = "Playback",
 		.channels_min = 2,
 		.channels_max = 2,
 		.rates = WM8728_RATES,
 		.formats = WM8728_FORMATS,
 	},
 	.ops = &wm8728_dai_ops,
 };
 EXPORT_SYMBOL_GPL(wm8728_dai);

 static int wm8728_suspend(struct platform_device *pdev, pm_message_t state)
 {
 	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 	struct snd_soc_codec *codec = socdev->card->codec;

 	wm8728_set_bias_level(codec, SND_SOC_BIAS_OFF);

 	return 0;
 }

 static int wm8728_resume(struct platform_device *pdev)
 {
 	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 	struct snd_soc_codec *codec = socdev->card->codec;

 	wm8728_set_bias_level(codec, codec->suspend_bias_level);

 	return 0;
 }

 /*
  * initialise the WM8728 driver
  * register the mixer and dsp interfaces with the kernel
  */
 static int wm8728_init(struct snd_soc_device *socdev,
 		       enum snd_soc_control_type control)
 {
 	struct snd_soc_codec *codec = socdev->card->codec;
 	int ret = 0;

 	codec->name = "WM8728";
 	codec->owner = THIS_MODULE;
 	codec->set_bias_level = wm8728_set_bias_level;
 	codec->dai = &wm8728_dai;
 	codec->num_dai = 1;
 	codec->bias_level = SND_SOC_BIAS_OFF;
 	codec->reg_cache_size = ARRAY_SIZE(wm8728_reg_defaults);
 	codec->reg_cache = kmemdup(wm8728_reg_defaults,
 				   sizeof(wm8728_reg_defaults),
 				   GFP_KERNEL);
 	if (codec->reg_cache == NULL)
 		return -ENOMEM;

 	ret = snd_soc_codec_set_cache_io(codec, 7, 9, control);
 	if (ret < 0) {
 		printk(KERN_ERR "wm8728: failed to configure cache I/O: %d\n",
 		       ret);
 		goto err;
 	}

 	/* register pcms */
 	ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
 	if (ret < 0) {
 		printk(KERN_ERR "wm8728: failed to create pcms\n");
 		goto err;
 	}

 	/* power on device */
 	wm8728_set_bias_level(codec, SND_SOC_BIAS_STANDBY);

 	snd_soc_add_controls(codec, wm8728_snd_controls,
 				ARRAY_SIZE(wm8728_snd_controls));
 	wm8728_add_widgets(codec);

 	return ret;

 err:
 	kfree(codec->reg_cache);
 	return ret;
 }

 static struct snd_soc_device *wm8728_socdev;

 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)

 /*
  * WM8728 2 wire address is determined by GPIO5
  * state during powerup.
  *    low  = 0x1a
  *    high = 0x1b
  */

 static int wm8728_i2c_probe(struct i2c_client *i2c,
 			    const struct i2c_device_id *id)
 {
 	struct snd_soc_device *socdev = wm8728_socdev;
 	struct snd_soc_codec *codec = socdev->card->codec;
 	int ret;

 	i2c_set_clientdata(i2c, codec);
 	codec->control_data = i2c;

 	ret = wm8728_init(socdev, SND_SOC_I2C);
 	if (ret < 0)
 		pr_err("failed to initialise WM8728\n");

 	return ret;
 }

 static int wm8728_i2c_remove(struct i2c_client *client)
 {
 	struct snd_soc_codec *codec = i2c_get_clientdata(client);
 	kfree(codec->reg_cache);
 	return 0;
 }

 static const struct i2c_device_id wm8728_i2c_id[] = {
 	{ "wm8728", 0 },
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, wm8728_i2c_id);

 static struct i2c_driver wm8728_i2c_driver = {
 	.driver = {
 		.name = "WM8728 I2C Codec",
 		.owner = THIS_MODULE,
 	},
 	.probe =    wm8728_i2c_probe,
 	.remove =   wm8728_i2c_remove,
 	.id_table = wm8728_i2c_id,
 };

 static int wm8728_add_i2c_device(struct platform_device *pdev,
 				 const struct wm8728_setup_data *setup)
 {
 	struct i2c_board_info info;
 	struct i2c_adapter *adapter;
 	struct i2c_client *client;
 	int ret;

 	ret = i2c_add_driver(&wm8728_i2c_driver);
 	if (ret != 0) {
 		dev_err(&pdev->dev, "can't add i2c driver\n");
 		return ret;
 	}

 	memset(&info, 0, sizeof(struct i2c_board_info));
 	info.addr = setup->i2c_address;
 	strlcpy(info.type, "wm8728", I2C_NAME_SIZE);

 	adapter = i2c_get_adapter(setup->i2c_bus);
 	if (!adapter) {
 		dev_err(&pdev->dev, "can't get i2c adapter %d\n",
 			setup->i2c_bus);
 		goto err_driver;
 	}

 	client = i2c_new_device(adapter, &info);
 	i2c_put_adapter(adapter);
 	if (!client) {
 		dev_err(&pdev->dev, "can't add i2c device at 0x%x\n",
 			(unsigned int)info.addr);
 		goto err_driver;
 	}

 	return 0;

 err_driver:
 	i2c_del_driver(&wm8728_i2c_driver);
 	return -ENODEV;
 }
 #endif

 #if defined(CONFIG_SPI_MASTER)
 static int __devinit wm8728_spi_probe(struct spi_device *spi)
 {
 	struct snd_soc_device *socdev = wm8728_socdev;
 	struct snd_soc_codec *codec = socdev->card->codec;
 	int ret;

 	codec->control_data = spi;

 	ret = wm8728_init(socdev, SND_SOC_SPI);
 	if (ret < 0)
 		dev_err(&spi->dev, "failed to initialise WM8728\n");

 	return ret;
 }

 static int __devexit wm8728_spi_remove(struct spi_device *spi)
 {
 	return 0;
 }

 static struct spi_driver wm8728_spi_driver = {
 	.driver = {
 		.name	= "wm8728",
 		.bus	= &spi_bus_type,
 		.owner	= THIS_MODULE,
 	},
 	.probe		= wm8728_spi_probe,
 	.remove		= __devexit_p(wm8728_spi_remove),
 };
 #endif /* CONFIG_SPI_MASTER */

 static int wm8728_probe(struct platform_device *pdev)
 {
 	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 	struct wm8728_setup_data *setup;
 	struct snd_soc_codec *codec;
 	int ret = 0;

 	setup = socdev->codec_data;
 	codec = kzalloc(sizeof(struct snd_soc_codec), GFP_KERNEL);
 	if (codec == NULL)
 		return -ENOMEM;

 	socdev->card->codec = codec;
 	mutex_init(&codec->mutex);
 	INIT_LIST_HEAD(&codec->dapm_widgets);
 	INIT_LIST_HEAD(&codec->dapm_paths);

 	wm8728_socdev = socdev;
 	ret = -ENODEV;

 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 	if (setup->i2c_address) {
 		ret = wm8728_add_i2c_device(pdev, setup);
 	}
 #endif
 #if defined(CONFIG_SPI_MASTER)
 	if (setup->spi) {
 		ret = spi_register_driver(&wm8728_spi_driver);
 		if (ret != 0)
 			printk(KERN_ERR "can't add spi driver");
 	}
 #endif

 	if (ret != 0)
 		kfree(codec);

 	return ret;
 }

 /* power down chip */
 static int wm8728_remove(struct platform_device *pdev)
 {
 	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 	struct snd_soc_codec *codec = socdev->card->codec;

 	if (codec->control_data)
 		wm8728_set_bias_level(codec, SND_SOC_BIAS_OFF);

 	snd_soc_free_pcms(socdev);
 	snd_soc_dapm_free(socdev);
 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 	i2c_unregister_device(codec->control_data);
 	i2c_del_driver(&wm8728_i2c_driver);
 #endif
 #if defined(CONFIG_SPI_MASTER)
 	spi_unregister_driver(&wm8728_spi_driver);
 #endif
 	kfree(codec);

 	return 0;
 }

 struct snd_soc_codec_device soc_codec_dev_wm8728 = {
 	.probe = 	wm8728_probe,
 	.remove = 	wm8728_remove,
 	.suspend = 	wm8728_suspend,
 	.resume =	wm8728_resume,
 };
 EXPORT_SYMBOL_GPL(soc_codec_dev_wm8728);

 static int __init wm8728_modinit(void)
 {
 	return snd_soc_register_dai(&wm8728_dai);
 }
 module_init(wm8728_modinit);

 static void __exit wm8728_exit(void)
 {
 	snd_soc_unregister_dai(&wm8728_dai);
 }
 module_exit(wm8728_exit);

 MODULE_DESCRIPTION("ASoC WM8728 driver");
 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 MODULE_LICENSE("GPL");
	/*
	* wm8728.c -- WM8728 ALSA SoC Audio driver
	*
	* Copyright 2008 Wolfson Microelectronics plc
	*
	* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 as
	* published by the Free Software Foundation.
	*/

	#include <linux/module.h>
	#include <linux/moduleparam.h>
	#include <linux/init.h>
	#include <linux/delay.h>
	#include <linux/pm.h>
	#include <linux/i2c.h>
	#include <linux/platform_device.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/soc-dapm.h>
	#include <sound/initval.h>
	#include <sound/tlv.h>

	#include "wm8728.h"

	struct snd_soc_codec_device soc_codec_dev_wm8728;

	/*
	* We can't read the WM8728 register space so we cache them instead.
	* Note that the defaults here aren't the physical defaults, we latch
	* the volume update bits, mute the output and enable infinite zero
	* detect.
	*/
	static const u16 wm8728_reg_defaults[] = {
	0x1ff,
	0x1ff,
	0x001,
	0x100,
	};

	static const DECLARE_TLV_DB_SCALE(wm8728_tlv, -12750, 50, 1);

	static const struct snd_kcontrol_new wm8728_snd_controls[] = {

	SOC_DOUBLE_R_TLV("Digital Playback Volume", WM8728_DACLVOL, WM8728_DACRVOL,
	0, 255, 0, wm8728_tlv),

	SOC_SINGLE("Deemphasis", WM8728_DACCTL, 1, 1, 0),
	};

	/*
	* DAPM controls.
	*/
	static const struct snd_soc_dapm_widget wm8728_dapm_widgets[] = {
	SND_SOC_DAPM_DAC("DAC", "HiFi Playback", SND_SOC_NOPM, 0, 0),
	SND_SOC_DAPM_OUTPUT("VOUTL"),
	SND_SOC_DAPM_OUTPUT("VOUTR"),
	};

	static const struct snd_soc_dapm_route intercon[] = {
	{"VOUTL", NULL, "DAC"},
	{"VOUTR", NULL, "DAC"},
	};

	static int wm8728_add_widgets(struct snd_soc_codec *codec)
	{
	snd_soc_dapm_new_controls(codec, wm8728_dapm_widgets,
	ARRAY_SIZE(wm8728_dapm_widgets));

	snd_soc_dapm_add_routes(codec, intercon, ARRAY_SIZE(intercon));

	return 0;
	}

	static int wm8728_mute(struct snd_soc_dai *dai, int mute)
	{
	struct snd_soc_codec *codec = dai->codec;
	u16 mute_reg = snd_soc_read(codec, WM8728_DACCTL);

	if (mute)
	snd_soc_write(codec, WM8728_DACCTL, mute_reg \| 1);
	else
	snd_soc_write(codec, WM8728_DACCTL, mute_reg & ~1);

	return 0;
	}

	static int wm8728_hw_params(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *params,
	struct snd_soc_dai *dai)
	{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_device *socdev = rtd->socdev;
	struct snd_soc_codec *codec = socdev->card->codec;
	u16 dac = snd_soc_read(codec, WM8728_DACCTL);

	dac &= ~0x18;

	switch (params_format(params)) {
	case SNDRV_PCM_FORMAT_S16_LE:
	break;
	case SNDRV_PCM_FORMAT_S20_3LE:
	dac \|= 0x10;
	break;
	case SNDRV_PCM_FORMAT_S24_LE:
	dac \|= 0x08;
	break;
	default:
	return -EINVAL;
	}

	snd_soc_write(codec, WM8728_DACCTL, dac);

	return 0;
	}

	static int wm8728_set_dai_fmt(struct snd_soc_dai *codec_dai,
	unsigned int fmt)
	{
	struct snd_soc_codec *codec = codec_dai->codec;
	u16 iface = snd_soc_read(codec, WM8728_IFCTL);

	/* Currently only I2S is supported by the driver, though the
	* hardware is more flexible.
	*/
	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
	case SND_SOC_DAIFMT_I2S:
	iface \|= 1;
	break;
	default:
	return -EINVAL;
	}

	/* The hardware only support full slave mode */
	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
	case SND_SOC_DAIFMT_CBS_CFS:
	break;
	default:
	return -EINVAL;
	}

	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
	case SND_SOC_DAIFMT_NB_NF:
	iface &= ~0x22;
	break;
	case SND_SOC_DAIFMT_IB_NF:
	iface \|= 0x20;
	iface &= ~0x02;
	break;
	case SND_SOC_DAIFMT_NB_IF:
	iface \|= 0x02;
	iface &= ~0x20;
	break;
	case SND_SOC_DAIFMT_IB_IF:
	iface \|= 0x22;
	break;
	default:
	return -EINVAL;
	}

	snd_soc_write(codec, WM8728_IFCTL, iface);
	return 0;
	}

	static int wm8728_set_bias_level(struct snd_soc_codec *codec,
	enum snd_soc_bias_level level)
	{
	u16 reg;
	int i;

	switch (level) {
	case SND_SOC_BIAS_ON:
	case SND_SOC_BIAS_PREPARE:
	case SND_SOC_BIAS_STANDBY:
	if (codec->bias_level == SND_SOC_BIAS_OFF) {
	/* Power everything up... */
	reg = snd_soc_read(codec, WM8728_DACCTL);
	snd_soc_write(codec, WM8728_DACCTL, reg & ~0x4);

	/* ..then sync in the register cache. */
	for (i = 0; i < ARRAY_SIZE(wm8728_reg_defaults); i++)
	snd_soc_write(codec, i,
	snd_soc_read(codec, i));
	}
	break;

	case SND_SOC_BIAS_OFF:
	reg = snd_soc_read(codec, WM8728_DACCTL);
	snd_soc_write(codec, WM8728_DACCTL, reg \| 0x4);
	break;
	}
	codec->bias_level = level;
	return 0;
	}

	#define WM8728_RATES (SNDRV_PCM_RATE_8000_192000)

	#define WM8728_FORMATS (SNDRV_PCM_FMTBIT_S16_LE \| SNDRV_PCM_FMTBIT_S20_3LE \|\
	SNDRV_PCM_FMTBIT_S24_LE)

	static struct snd_soc_dai_ops wm8728_dai_ops = {
	.hw_params = wm8728_hw_params,
	.digital_mute = wm8728_mute,
	.set_fmt = wm8728_set_dai_fmt,
	};

	struct snd_soc_dai wm8728_dai = {
	.name = "WM8728",
	.playback = {
	.stream_name = "Playback",
	.channels_min = 2,
	.channels_max = 2,
	.rates = WM8728_RATES,
	.formats = WM8728_FORMATS,
	},
	.ops = &wm8728_dai_ops,
	};
	EXPORT_SYMBOL_GPL(wm8728_dai);

	static int wm8728_suspend(struct platform_device *pdev, pm_message_t state)
	{
	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
	struct snd_soc_codec *codec = socdev->card->codec;

	wm8728_set_bias_level(codec, SND_SOC_BIAS_OFF);

	return 0;
	}

	static int wm8728_resume(struct platform_device *pdev)
	{
	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
	struct snd_soc_codec *codec = socdev->card->codec;

	wm8728_set_bias_level(codec, codec->suspend_bias_level);

	return 0;
	}

	/*
	* initialise the WM8728 driver
	* register the mixer and dsp interfaces with the kernel
	*/
	static int wm8728_init(struct snd_soc_device *socdev,
	enum snd_soc_control_type control)
	{
	struct snd_soc_codec *codec = socdev->card->codec;
	int ret = 0;

	codec->name = "WM8728";
	codec->owner = THIS_MODULE;
	codec->set_bias_level = wm8728_set_bias_level;
	codec->dai = &wm8728_dai;
	codec->num_dai = 1;
	codec->bias_level = SND_SOC_BIAS_OFF;
	codec->reg_cache_size = ARRAY_SIZE(wm8728_reg_defaults);
	codec->reg_cache = kmemdup(wm8728_reg_defaults,
	sizeof(wm8728_reg_defaults),
	GFP_KERNEL);
	if (codec->reg_cache == NULL)
	return -ENOMEM;

	ret = snd_soc_codec_set_cache_io(codec, 7, 9, control);
	if (ret < 0) {
	printk(KERN_ERR "wm8728: failed to configure cache I/O: %d\n",
	ret);
	goto err;
	}

	/* register pcms */
	ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
	if (ret < 0) {
	printk(KERN_ERR "wm8728: failed to create pcms\n");
	goto err;
	}

	/* power on device */
	wm8728_set_bias_level(codec, SND_SOC_BIAS_STANDBY);

	snd_soc_add_controls(codec, wm8728_snd_controls,
	ARRAY_SIZE(wm8728_snd_controls));
	wm8728_add_widgets(codec);

	return ret;

	err:
	kfree(codec->reg_cache);
	return ret;
	}

	static struct snd_soc_device *wm8728_socdev;

	#if defined(CONFIG_I2C) \|\| defined(CONFIG_I2C_MODULE)

	/*
	* WM8728 2 wire address is determined by GPIO5
	* state during powerup.
	* low = 0x1a
	* high = 0x1b
	*/

	static int wm8728_i2c_probe(struct i2c_client *i2c,
	const struct i2c_device_id *id)
	{
	struct snd_soc_device *socdev = wm8728_socdev;
	struct snd_soc_codec *codec = socdev->card->codec;
	int ret;

	i2c_set_clientdata(i2c, codec);
	codec->control_data = i2c;

	ret = wm8728_init(socdev, SND_SOC_I2C);
	if (ret < 0)
	pr_err("failed to initialise WM8728\n");

	return ret;
	}

	static int wm8728_i2c_remove(struct i2c_client *client)
	{
	struct snd_soc_codec *codec = i2c_get_clientdata(client);
	kfree(codec->reg_cache);
	return 0;
	}

	static const struct i2c_device_id wm8728_i2c_id[] = {
	{ "wm8728", 0 },
	{ }
	};
	MODULE_DEVICE_TABLE(i2c, wm8728_i2c_id);

	static struct i2c_driver wm8728_i2c_driver = {
	.driver = {
	.name = "WM8728 I2C Codec",
	.owner = THIS_MODULE,
	},
	.probe = wm8728_i2c_probe,
	.remove = wm8728_i2c_remove,
	.id_table = wm8728_i2c_id,
	};

	static int wm8728_add_i2c_device(struct platform_device *pdev,
	const struct wm8728_setup_data *setup)
	{
	struct i2c_board_info info;
	struct i2c_adapter *adapter;
	struct i2c_client *client;
	int ret;

	ret = i2c_add_driver(&wm8728_i2c_driver);
	if (ret != 0) {
	dev_err(&pdev->dev, "can't add i2c driver\n");
	return ret;
	}

	memset(&info, 0, sizeof(struct i2c_board_info));
	info.addr = setup->i2c_address;
	strlcpy(info.type, "wm8728", I2C_NAME_SIZE);

	adapter = i2c_get_adapter(setup->i2c_bus);
	if (!adapter) {
	dev_err(&pdev->dev, "can't get i2c adapter %d\n",
	setup->i2c_bus);
	goto err_driver;
	}

	client = i2c_new_device(adapter, &info);
	i2c_put_adapter(adapter);
	if (!client) {
	dev_err(&pdev->dev, "can't add i2c device at 0x%x\n",
	(unsigned int)info.addr);
	goto err_driver;
	}

	return 0;

	err_driver:
	i2c_del_driver(&wm8728_i2c_driver);
	return -ENODEV;
	}
	#endif

	#if defined(CONFIG_SPI_MASTER)
	static int __devinit wm8728_spi_probe(struct spi_device *spi)
	{
	struct snd_soc_device *socdev = wm8728_socdev;
	struct snd_soc_codec *codec = socdev->card->codec;
	int ret;

	codec->control_data = spi;

	ret = wm8728_init(socdev, SND_SOC_SPI);
	if (ret < 0)
	dev_err(&spi->dev, "failed to initialise WM8728\n");

	return ret;
	}

	static int __devexit wm8728_spi_remove(struct spi_device *spi)
	{
	return 0;
	}

	static struct spi_driver wm8728_spi_driver = {
	.driver = {
	.name = "wm8728",
	.bus = &spi_bus_type,
	.owner = THIS_MODULE,
	},
	.probe = wm8728_spi_probe,
	.remove = __devexit_p(wm8728_spi_remove),
	};
	#endif /* CONFIG_SPI_MASTER */

	static int wm8728_probe(struct platform_device *pdev)
	{
	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
	struct wm8728_setup_data *setup;
	struct snd_soc_codec *codec;
	int ret = 0;

	setup = socdev->codec_data;
	codec = kzalloc(sizeof(struct snd_soc_codec), GFP_KERNEL);
	if (codec == NULL)
	return -ENOMEM;

	socdev->card->codec = codec;
	mutex_init(&codec->mutex);
	INIT_LIST_HEAD(&codec->dapm_widgets);
	INIT_LIST_HEAD(&codec->dapm_paths);

	wm8728_socdev = socdev;
	ret = -ENODEV;

	#if defined(CONFIG_I2C) \|\| defined(CONFIG_I2C_MODULE)
	if (setup->i2c_address) {
	ret = wm8728_add_i2c_device(pdev, setup);
	}
	#endif
	#if defined(CONFIG_SPI_MASTER)
	if (setup->spi) {
	ret = spi_register_driver(&wm8728_spi_driver);
	if (ret != 0)
	printk(KERN_ERR "can't add spi driver");
	}
	#endif

	if (ret != 0)
	kfree(codec);

	return ret;
	}

	/* power down chip */
	static int wm8728_remove(struct platform_device *pdev)
	{
	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
	struct snd_soc_codec *codec = socdev->card->codec;

	if (codec->control_data)
	wm8728_set_bias_level(codec, SND_SOC_BIAS_OFF);

	snd_soc_free_pcms(socdev);
	snd_soc_dapm_free(socdev);
	#if defined(CONFIG_I2C) \|\| defined(CONFIG_I2C_MODULE)
	i2c_unregister_device(codec->control_data);
	i2c_del_driver(&wm8728_i2c_driver);
	#endif
	#if defined(CONFIG_SPI_MASTER)
	spi_unregister_driver(&wm8728_spi_driver);
	#endif
	kfree(codec);

	return 0;
	}

	struct snd_soc_codec_device soc_codec_dev_wm8728 = {
	.probe = wm8728_probe,
	.remove = wm8728_remove,
	.suspend = wm8728_suspend,
	.resume = wm8728_resume,
	};
	EXPORT_SYMBOL_GPL(soc_codec_dev_wm8728);

	static int __init wm8728_modinit(void)
	{
	return snd_soc_register_dai(&wm8728_dai);
	}
	module_init(wm8728_modinit);

	static void __exit wm8728_exit(void)
	{
	snd_soc_unregister_dai(&wm8728_dai);
	}
	module_exit(wm8728_exit);

	MODULE_DESCRIPTION("ASoC WM8728 driver");
	MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
	MODULE_LICENSE("GPL");