sound/soc/codecs/wm8728.c - kernel/msm-4.9 - 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 <linux/slab.h>
 #include <sound/core.h>
 #include <sound/pcm.h>
 #include <sound/pcm_params.h>
 #include <sound/soc.h>
 #include <sound/initval.h>
 #include <sound/tlv.h>

 #include "wm8728.h"

 /*
  * 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,
 };

 /* codec private data */
 struct wm8728_priv {
 	enum snd_soc_control_type control_type;
 };

 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 wm8728_intercon[] = {
 	{"VOUTL", NULL, "DAC"},
 	{"VOUTR", NULL, "DAC"},
 };

 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_codec *codec = rtd->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->dapm.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->dapm.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,
 };

 static struct snd_soc_dai_driver wm8728_dai = {
 	.name = "wm8728-hifi",
 	.playback = {
 		.stream_name = "Playback",
 		.channels_min = 2,
 		.channels_max = 2,
 		.rates = WM8728_RATES,
 		.formats = WM8728_FORMATS,
 	},
 	.ops = &wm8728_dai_ops,
 };

 static int wm8728_suspend(struct snd_soc_codec *codec, pm_message_t state)
 {
 	wm8728_set_bias_level(codec, SND_SOC_BIAS_OFF);

 	return 0;
 }

 static int wm8728_resume(struct snd_soc_codec *codec)
 {
 	wm8728_set_bias_level(codec, SND_SOC_BIAS_STANDBY);

 	return 0;
 }

 static int wm8728_probe(struct snd_soc_codec *codec)
 {
 	struct wm8728_priv *wm8728 = snd_soc_codec_get_drvdata(codec);
 	int ret;

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

 	/* 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));

 	return ret;
 }

 static int wm8728_remove(struct snd_soc_codec *codec)
 {
 	wm8728_set_bias_level(codec, SND_SOC_BIAS_OFF);
 	return 0;
 }

 static struct snd_soc_codec_driver soc_codec_dev_wm8728 = {
 	.probe =	wm8728_probe,
 	.remove =	wm8728_remove,
 	.suspend =	wm8728_suspend,
 	.resume =	wm8728_resume,
 	.set_bias_level = wm8728_set_bias_level,
 	.reg_cache_size = ARRAY_SIZE(wm8728_reg_defaults),
 	.reg_word_size = sizeof(u16),
 	.reg_cache_default = wm8728_reg_defaults,
 	.dapm_widgets = wm8728_dapm_widgets,
 	.num_dapm_widgets = ARRAY_SIZE(wm8728_dapm_widgets),
 	.dapm_routes = wm8728_intercon,
 	.num_dapm_routes = ARRAY_SIZE(wm8728_intercon),
 };

 #if defined(CONFIG_SPI_MASTER)
 static int __devinit wm8728_spi_probe(struct spi_device *spi)
 {
 	struct wm8728_priv *wm8728;
 	int ret;

 	wm8728 = kzalloc(sizeof(struct wm8728_priv), GFP_KERNEL);
 	if (wm8728 == NULL)
 		return -ENOMEM;

 	wm8728->control_type = SND_SOC_SPI;
 	spi_set_drvdata(spi, wm8728);

 	ret = snd_soc_register_codec(&spi->dev,
 			&soc_codec_dev_wm8728, &wm8728_dai, 1);
 	if (ret < 0)
 		kfree(wm8728);
 	return ret;
 }

 static int __devexit wm8728_spi_remove(struct spi_device *spi)
 {
 	snd_soc_unregister_codec(&spi->dev);
 	kfree(spi_get_drvdata(spi));
 	return 0;
 }

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

 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 static __devinit int wm8728_i2c_probe(struct i2c_client *i2c,
 				      const struct i2c_device_id *id)
 {
 	struct wm8728_priv *wm8728;
 	int ret;

 	wm8728 = kzalloc(sizeof(struct wm8728_priv), GFP_KERNEL);
 	if (wm8728 == NULL)
 		return -ENOMEM;

 	i2c_set_clientdata(i2c, wm8728);
 	wm8728->control_type = SND_SOC_I2C;

 	ret =  snd_soc_register_codec(&i2c->dev,
 			&soc_codec_dev_wm8728, &wm8728_dai, 1);
 	if (ret < 0)
 		kfree(wm8728);
 	return ret;
 }

 static __devexit int wm8728_i2c_remove(struct i2c_client *client)
 {
 	snd_soc_unregister_codec(&client->dev);
 	kfree(i2c_get_clientdata(client));
 	return 0;
 }

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

 static struct i2c_driver wm8728_i2c_driver = {
 	.driver = {
 		.name = "wm8728-codec",
 		.owner = THIS_MODULE,
 	},
 	.probe =    wm8728_i2c_probe,
 	.remove =   __devexit_p(wm8728_i2c_remove),
 	.id_table = wm8728_i2c_id,
 };
 #endif

 static int __init wm8728_modinit(void)
 {
 	int ret = 0;
 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 	ret = i2c_add_driver(&wm8728_i2c_driver);
 	if (ret != 0) {
 		printk(KERN_ERR "Failed to register wm8728 I2C driver: %d\n",
 		       ret);
 	}
 #endif
 #if defined(CONFIG_SPI_MASTER)
 	ret = spi_register_driver(&wm8728_spi_driver);
 	if (ret != 0) {
 		printk(KERN_ERR "Failed to register wm8728 SPI driver: %d\n",
 		       ret);
 	}
 #endif
 	return ret;
 }
 module_init(wm8728_modinit);

 static void __exit wm8728_exit(void)
 {
 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 	i2c_del_driver(&wm8728_i2c_driver);
 #endif
 #if defined(CONFIG_SPI_MASTER)
 	spi_unregister_driver(&wm8728_spi_driver);
 #endif
 }
 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 <linux/slab.h>
	#include <sound/core.h>
	#include <sound/pcm.h>
	#include <sound/pcm_params.h>
	#include <sound/soc.h>
	#include <sound/initval.h>
	#include <sound/tlv.h>

	#include "wm8728.h"

	/*
	* 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,
	};

	/* codec private data */
	struct wm8728_priv {
	enum snd_soc_control_type control_type;
	};

	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 wm8728_intercon[] = {
	{"VOUTL", NULL, "DAC"},
	{"VOUTR", NULL, "DAC"},
	};

	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_codec *codec = rtd->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->dapm.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->dapm.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,
	};

	static struct snd_soc_dai_driver wm8728_dai = {
	.name = "wm8728-hifi",
	.playback = {
	.stream_name = "Playback",
	.channels_min = 2,
	.channels_max = 2,
	.rates = WM8728_RATES,
	.formats = WM8728_FORMATS,
	},
	.ops = &wm8728_dai_ops,
	};

	static int wm8728_suspend(struct snd_soc_codec *codec, pm_message_t state)
	{
	wm8728_set_bias_level(codec, SND_SOC_BIAS_OFF);

	return 0;
	}

	static int wm8728_resume(struct snd_soc_codec *codec)
	{
	wm8728_set_bias_level(codec, SND_SOC_BIAS_STANDBY);

	return 0;
	}

	static int wm8728_probe(struct snd_soc_codec *codec)
	{
	struct wm8728_priv *wm8728 = snd_soc_codec_get_drvdata(codec);
	int ret;

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

	/* 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));

	return ret;
	}

	static int wm8728_remove(struct snd_soc_codec *codec)
	{
	wm8728_set_bias_level(codec, SND_SOC_BIAS_OFF);
	return 0;
	}

	static struct snd_soc_codec_driver soc_codec_dev_wm8728 = {
	.probe = wm8728_probe,
	.remove = wm8728_remove,
	.suspend = wm8728_suspend,
	.resume = wm8728_resume,
	.set_bias_level = wm8728_set_bias_level,
	.reg_cache_size = ARRAY_SIZE(wm8728_reg_defaults),
	.reg_word_size = sizeof(u16),
	.reg_cache_default = wm8728_reg_defaults,
	.dapm_widgets = wm8728_dapm_widgets,
	.num_dapm_widgets = ARRAY_SIZE(wm8728_dapm_widgets),
	.dapm_routes = wm8728_intercon,
	.num_dapm_routes = ARRAY_SIZE(wm8728_intercon),
	};

	#if defined(CONFIG_SPI_MASTER)
	static int __devinit wm8728_spi_probe(struct spi_device *spi)
	{
	struct wm8728_priv *wm8728;
	int ret;

	wm8728 = kzalloc(sizeof(struct wm8728_priv), GFP_KERNEL);
	if (wm8728 == NULL)
	return -ENOMEM;

	wm8728->control_type = SND_SOC_SPI;
	spi_set_drvdata(spi, wm8728);

	ret = snd_soc_register_codec(&spi->dev,
	&soc_codec_dev_wm8728, &wm8728_dai, 1);
	if (ret < 0)
	kfree(wm8728);
	return ret;
	}

	static int __devexit wm8728_spi_remove(struct spi_device *spi)
	{
	snd_soc_unregister_codec(&spi->dev);
	kfree(spi_get_drvdata(spi));
	return 0;
	}

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

	#if defined(CONFIG_I2C) \|\| defined(CONFIG_I2C_MODULE)
	static __devinit int wm8728_i2c_probe(struct i2c_client *i2c,
	const struct i2c_device_id *id)
	{
	struct wm8728_priv *wm8728;
	int ret;

	wm8728 = kzalloc(sizeof(struct wm8728_priv), GFP_KERNEL);
	if (wm8728 == NULL)
	return -ENOMEM;

	i2c_set_clientdata(i2c, wm8728);
	wm8728->control_type = SND_SOC_I2C;

	ret = snd_soc_register_codec(&i2c->dev,
	&soc_codec_dev_wm8728, &wm8728_dai, 1);
	if (ret < 0)
	kfree(wm8728);
	return ret;
	}

	static __devexit int wm8728_i2c_remove(struct i2c_client *client)
	{
	snd_soc_unregister_codec(&client->dev);
	kfree(i2c_get_clientdata(client));
	return 0;
	}

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

	static struct i2c_driver wm8728_i2c_driver = {
	.driver = {
	.name = "wm8728-codec",
	.owner = THIS_MODULE,
	},
	.probe = wm8728_i2c_probe,
	.remove = __devexit_p(wm8728_i2c_remove),
	.id_table = wm8728_i2c_id,
	};
	#endif

	static int __init wm8728_modinit(void)
	{
	int ret = 0;
	#if defined(CONFIG_I2C) \|\| defined(CONFIG_I2C_MODULE)
	ret = i2c_add_driver(&wm8728_i2c_driver);
	if (ret != 0) {
	printk(KERN_ERR "Failed to register wm8728 I2C driver: %d\n",
	ret);
	}
	#endif
	#if defined(CONFIG_SPI_MASTER)
	ret = spi_register_driver(&wm8728_spi_driver);
	if (ret != 0) {
	printk(KERN_ERR "Failed to register wm8728 SPI driver: %d\n",
	ret);
	}
	#endif
	return ret;
	}
	module_init(wm8728_modinit);

	static void __exit wm8728_exit(void)
	{
	#if defined(CONFIG_I2C) \|\| defined(CONFIG_I2C_MODULE)
	i2c_del_driver(&wm8728_i2c_driver);
	#endif
	#if defined(CONFIG_SPI_MASTER)
	spi_unregister_driver(&wm8728_spi_driver);
	#endif
	}
	module_exit(wm8728_exit);

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