Commit 1dcf98ff authored by Mark Brown's avatar Mark Brown
Browse files

ASoC: Add WM8523 CODEC driver 



The WM8523 is a high performance stereo DAC with integral charge
pump providing 2Vrms line driver outputs using a single 3.3V power
supply rail.

Signed-off-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
parent 416356fc

sound/soc/codecs/Kconfig

+4 −0
Original line number Diff line number Diff line
@@ -30,6 +30,7 @@ config SND_SOC_ALL_CODECS 
	select SND_SOC_WM8350 if MFD_WM8350

	select SND_SOC_WM8400 if MFD_WM8400

	select SND_SOC_WM8510 if SND_SOC_I2C_AND_SPI

	select SND_SOC_WM8523 if I2C

	select SND_SOC_WM8580 if I2C

	select SND_SOC_WM8728 if SND_SOC_I2C_AND_SPI

	select SND_SOC_WM8731 if SND_SOC_I2C_AND_SPI
@@ -130,6 +131,9 @@ config SND_SOC_WM8400 
config SND_SOC_WM8510

	tristate



config SND_SOC_WM8523

	tristate



config SND_SOC_WM8580

	tristate

sound/soc/codecs/Makefile

+2 −0
Original line number Diff line number Diff line
@@ -18,6 +18,7 @@ snd-soc-uda1380-objs := uda1380.o 
snd-soc-wm8350-objs := wm8350.o

snd-soc-wm8400-objs := wm8400.o

snd-soc-wm8510-objs := wm8510.o

snd-soc-wm8523-objs := wm8523.o

snd-soc-wm8580-objs := wm8580.o

snd-soc-wm8728-objs := wm8728.o

snd-soc-wm8731-objs := wm8731.o
@@ -56,6 +57,7 @@ obj-$(CONFIG_SND_SOC_UDA1380) += snd-soc-uda1380.o 
obj-$(CONFIG_SND_SOC_WM8350)	+= snd-soc-wm8350.o

obj-$(CONFIG_SND_SOC_WM8400)	+= snd-soc-wm8400.o

obj-$(CONFIG_SND_SOC_WM8510)	+= snd-soc-wm8510.o

obj-$(CONFIG_SND_SOC_WM8523)	+= snd-soc-wm8523.o

obj-$(CONFIG_SND_SOC_WM8580)	+= snd-soc-wm8580.o

obj-$(CONFIG_SND_SOC_WM8728)	+= snd-soc-wm8728.o

obj-$(CONFIG_SND_SOC_WM8731)	+= snd-soc-wm8731.o

sound/soc/codecs/wm8523.c

0 → 100644
+755 −0
Original line number Diff line number Diff line 
/*

 * wm8523.c  --  WM8523 ALSA SoC Audio driver

 *

 * Copyright 2009 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/regulator/consumer.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 "wm8523.h"



static struct snd_soc_codec *wm8523_codec;

struct snd_soc_codec_device soc_codec_dev_wm8523;



#define WM8523_NUM_SUPPLIES 2

static const char *wm8523_supply_names[WM8523_NUM_SUPPLIES] = {

	"AVDD",

	"LINEVDD",

};



#define WM8523_NUM_RATES 7



/* codec private data */

struct wm8523_priv {

	struct snd_soc_codec codec;

	u16 reg_cache[WM8523_REGISTER_COUNT];

	struct regulator_bulk_data supplies[WM8523_NUM_SUPPLIES];

	unsigned int sysclk;

	unsigned int rate_constraint_list[WM8523_NUM_RATES];

	struct snd_pcm_hw_constraint_list rate_constraint;

};



static const u16 wm8523_reg[WM8523_REGISTER_COUNT] = {

	0x8523,     /* R0 - DEVICE_ID */

	0x0001,     /* R1 - REVISION */

	0x0000,     /* R2 - PSCTRL1 */

	0x1812,     /* R3 - AIF_CTRL1 */

	0x0000,     /* R4 - AIF_CTRL2 */

	0x0001,     /* R5 - DAC_CTRL3 */

	0x0190,     /* R6 - DAC_GAINL */

	0x0190,     /* R7 - DAC_GAINR */

	0x0000,     /* R8 - ZERO_DETECT */

};



static int wm8523_volatile(unsigned int reg)

{

	switch (reg) {

	case WM8523_DEVICE_ID:

	case WM8523_REVISION:

		return 1;

	default:

		return 0;

	}

}



static int wm8523_write(struct snd_soc_codec *codec, unsigned int reg,

	unsigned int value)

{

	struct wm8523_priv *wm8523 = codec->private_data;

	u8 data[3];



	BUG_ON(reg > WM8523_MAX_REGISTER);



	data[0] = reg;

	data[1] = (value >> 8) & 0x00ff;

	data[2] = value & 0x00ff;



	if (!wm8523_volatile(reg))

		wm8523->reg_cache[reg] = value;

	if (codec->hw_write(codec->control_data, data, 3) == 3)

		return 0;

	else

		return -EIO;

}



static int wm8523_reset(struct snd_soc_codec *codec)

{

	return wm8523_write(codec, WM8523_DEVICE_ID, 0);

}



static unsigned int wm8523_read_hw(struct snd_soc_codec *codec, u8 reg)

{

	struct i2c_msg xfer[2];

	u16 data;

	int ret;

	struct i2c_client *i2c = codec->control_data;



	/* Write register */

	xfer[0].addr = i2c->addr;

	xfer[0].flags = 0;

	xfer[0].len = 1;

	xfer[0].buf = &reg;



	/* Read data */

	xfer[1].addr = i2c->addr;

	xfer[1].flags = I2C_M_RD;

	xfer[1].len = 2;

	xfer[1].buf = (u8 *)&data;



	ret = i2c_transfer(i2c->adapter, xfer, 2);

	if (ret != 2) {

		dev_err(codec->dev, "Failed to read 0x%x: %d\n", reg, ret);

		return 0;

	}



	return (data >> 8) | ((data & 0xff) << 8);

}





static unsigned int wm8523_read(struct snd_soc_codec *codec,

				unsigned int reg)

{

	u16 *reg_cache = codec->reg_cache;



	BUG_ON(reg > WM8523_MAX_REGISTER);



	if (wm8523_volatile(reg))

		return wm8523_read_hw(codec, reg);

	else

		return reg_cache[reg];

}



static const DECLARE_TLV_DB_SCALE(dac_tlv, -10000, 25, 0);



static const char *wm8523_zd_count_text[] = {

	"1024",

	"2048",

};



static const struct soc_enum wm8523_zc_count =

	SOC_ENUM_SINGLE(WM8523_ZERO_DETECT, 0, 2, wm8523_zd_count_text);



static const struct snd_kcontrol_new wm8523_snd_controls[] = {

SOC_DOUBLE_R_TLV("Playback Volume", WM8523_DAC_GAINL, WM8523_DAC_GAINR,

		 0, 448, 0, dac_tlv),

SOC_SINGLE("ZC Switch", WM8523_DAC_CTRL3, 4, 1, 0),

SOC_SINGLE("Playback Deemphasis Switch", WM8523_AIF_CTRL1, 8, 1, 0),

SOC_DOUBLE("Playback Switch", WM8523_DAC_CTRL3, 2, 3, 1, 1),

SOC_SINGLE("Volume Ramp Up Switch", WM8523_DAC_CTRL3, 1, 1, 0),

SOC_SINGLE("Volume Ramp Down Switch", WM8523_DAC_CTRL3, 0, 1, 0),

SOC_ENUM("Zero Detect Count", wm8523_zc_count),

};



static const struct snd_soc_dapm_widget wm8523_dapm_widgets[] = {

SND_SOC_DAPM_DAC("DAC", "Playback", SND_SOC_NOPM, 0, 0),

SND_SOC_DAPM_OUTPUT("LINEVOUTL"),

SND_SOC_DAPM_OUTPUT("LINEVOUTR"),

};



static const struct snd_soc_dapm_route intercon[] = {

	{ "LINEVOUTL", NULL, "DAC" },

	{ "LINEVOUTR", NULL, "DAC" },

};



static int wm8523_add_widgets(struct snd_soc_codec *codec)

{

	snd_soc_dapm_new_controls(codec, wm8523_dapm_widgets,

				  ARRAY_SIZE(wm8523_dapm_widgets));



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



	snd_soc_dapm_new_widgets(codec);

	return 0;

}



static struct {

	int value;

	int ratio;

} lrclk_ratios[WM8523_NUM_RATES] = {

	{ 1, 128 },

	{ 2, 192 },

	{ 3, 256 },

	{ 4, 384 },

	{ 5, 512 },

	{ 6, 768 },

	{ 7, 1152 },

};



static int wm8523_startup(struct snd_pcm_substream *substream,

			  struct snd_soc_dai *dai)

{

	struct snd_soc_codec *codec = dai->codec;

	struct wm8523_priv *wm8523 = codec->private_data;



	/* The set of sample rates that can be supported depends on the

	 * MCLK supplied to the CODEC - enforce this.

	 */

	if (!wm8523->sysclk) {

		dev_err(codec->dev,

			"No MCLK configured, call set_sysclk() on init\n");

		return -EINVAL;

	}



	return 0;

	snd_pcm_hw_constraint_list(substream->runtime, 0,

				   SNDRV_PCM_HW_PARAM_RATE,

				   &wm8523->rate_constraint);



	return 0;

}



static int wm8523_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;

	struct wm8523_priv *wm8523 = codec->private_data;

	int i;

	u16 aifctrl1 = wm8523_read(codec, WM8523_AIF_CTRL1);

	u16 aifctrl2 = wm8523_read(codec, WM8523_AIF_CTRL2);



	/* Find a supported LRCLK ratio */

	for (i = 0; i < ARRAY_SIZE(lrclk_ratios); i++) {

		if (wm8523->sysclk / params_rate(params) ==

		    lrclk_ratios[i].ratio)

			break;

	}



	/* Should never happen, should be handled by constraints */

	if (i == ARRAY_SIZE(lrclk_ratios)) {

		dev_err(codec->dev, "MCLK/fs ratio %d unsupported\n",

			wm8523->sysclk / params_rate(params));

		return -EINVAL;

	}



	aifctrl2 &= ~WM8523_SR_MASK;

	aifctrl2 |= lrclk_ratios[i].value;



	aifctrl1 &= ~WM8523_WL_MASK;

	switch (params_format(params)) {

	case SNDRV_PCM_FORMAT_S16_LE:

		break;

	case SNDRV_PCM_FORMAT_S20_3LE:

		aifctrl1 |= 0x8;

		break;

	case SNDRV_PCM_FORMAT_S24_LE:

		aifctrl1 |= 0x10;

		break;

	case SNDRV_PCM_FORMAT_S32_LE:

		aifctrl1 |= 0x18;

		break;

	}



	wm8523_write(codec, WM8523_AIF_CTRL1, aifctrl1);

	wm8523_write(codec, WM8523_AIF_CTRL2, aifctrl2);



	return 0;

}



static int wm8523_set_dai_sysclk(struct snd_soc_dai *codec_dai,

		int clk_id, unsigned int freq, int dir)

{

	struct snd_soc_codec *codec = codec_dai->codec;

	struct wm8523_priv *wm8523 = codec->private_data;

	unsigned int val;

	int i;



	wm8523->sysclk = freq;



	wm8523->rate_constraint.count = 0;

	for (i = 0; i < ARRAY_SIZE(lrclk_ratios); i++) {

		val = freq / lrclk_ratios[i].ratio;

		/* Check that it's a standard rate since core can't

		 * cope with others and having the odd rates confuses

		 * constraint matching.

		 */

		switch (val) {

		case 8000:

		case 11025:

		case 16000:

		case 22050:

		case 32000:

		case 44100:

		case 48000:

		case 64000:

		case 88200:

		case 96000:

		case 176400:

		case 192000:

			dev_dbg(codec->dev, "Supported sample rate: %dHz\n",

				val);

			wm8523->rate_constraint_list[i] = val;

			wm8523->rate_constraint.count++;

			break;

		default:

			dev_dbg(codec->dev, "Skipping sample rate: %dHz\n",

				val);

		}

	}



	/* Need at least one supported rate... */

	if (wm8523->rate_constraint.count == 0)

		return -EINVAL;



	return 0;

}





static int wm8523_set_dai_fmt(struct snd_soc_dai *codec_dai,

		unsigned int fmt)

{

	struct snd_soc_codec *codec = codec_dai->codec;

	u16 aifctrl1 = wm8523_read(codec, WM8523_AIF_CTRL1);



	aifctrl1 &= ~(WM8523_BCLK_INV_MASK | WM8523_LRCLK_INV_MASK |

		      WM8523_FMT_MASK | WM8523_AIF_MSTR_MASK);



	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {

	case SND_SOC_DAIFMT_CBM_CFM:

		aifctrl1 |= WM8523_AIF_MSTR;

		break;

	case SND_SOC_DAIFMT_CBS_CFS:

		break;

	default:

		return -EINVAL;

	}



	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {

	case SND_SOC_DAIFMT_I2S:

		aifctrl1 |= 0x0002;

		break;

	case SND_SOC_DAIFMT_RIGHT_J:

		break;

	case SND_SOC_DAIFMT_LEFT_J:

		aifctrl1 |= 0x0001;

		break;

	case SND_SOC_DAIFMT_DSP_A:

		aifctrl1 |= 0x0003;

		break;

	case SND_SOC_DAIFMT_DSP_B:

		aifctrl1 |= 0x0023;

		break;

	default:

		return -EINVAL;

	}



	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {

	case SND_SOC_DAIFMT_NB_NF:

		break;

	case SND_SOC_DAIFMT_IB_IF:

		aifctrl1 |= WM8523_BCLK_INV | WM8523_LRCLK_INV;

		break;

	case SND_SOC_DAIFMT_IB_NF:

		aifctrl1 |= WM8523_BCLK_INV;

		break;

	case SND_SOC_DAIFMT_NB_IF:

		aifctrl1 |= WM8523_LRCLK_INV;

		break;

	default:

		return -EINVAL;

	}



	wm8523_write(codec, WM8523_AIF_CTRL1, aifctrl1);



	return 0;

}



static int wm8523_set_bias_level(struct snd_soc_codec *codec,

				 enum snd_soc_bias_level level)

{

	struct wm8523_priv *wm8523 = codec->private_data;

	int ret, i;



	switch (level) {

	case SND_SOC_BIAS_ON:

		break;



	case SND_SOC_BIAS_PREPARE:

		/* Full power on */

		snd_soc_update_bits(codec, WM8523_PSCTRL1,

				    WM8523_SYS_ENA_MASK, 3);

		break;



	case SND_SOC_BIAS_STANDBY:

		if (codec->bias_level == SND_SOC_BIAS_OFF) {

			ret = regulator_bulk_enable(ARRAY_SIZE(wm8523->supplies),

						    wm8523->supplies);

			if (ret != 0) {

				dev_err(codec->dev,

					"Failed to enable supplies: %d\n",

					ret);

				return ret;

			}



			/* Initial power up */

			snd_soc_update_bits(codec, WM8523_PSCTRL1,

					    WM8523_SYS_ENA_MASK, 1);



			/* Sync back default/cached values */

			for (i = WM8523_AIF_CTRL1;

			     i < WM8523_MAX_REGISTER; i++)

				wm8523_write(codec, i, wm8523->reg_cache[i]);





			msleep(100);

		}



		/* Power up to mute */

		snd_soc_update_bits(codec, WM8523_PSCTRL1,

				    WM8523_SYS_ENA_MASK, 2);



		break;



	case SND_SOC_BIAS_OFF:

		/* The chip runs through the power down sequence for us. */

		snd_soc_update_bits(codec, WM8523_PSCTRL1,

				    WM8523_SYS_ENA_MASK, 0);

		msleep(100);



		regulator_bulk_disable(ARRAY_SIZE(wm8523->supplies),

				       wm8523->supplies);

		break;

	}

	codec->bias_level = level;

	return 0;

}



#define WM8523_RATES SNDRV_PCM_RATE_8000_192000



#define WM8523_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\

			SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S32_LE)



static struct snd_soc_dai_ops wm8523_dai_ops = {

	.startup	= wm8523_startup,

	.hw_params	= wm8523_hw_params,

	.set_sysclk	= wm8523_set_dai_sysclk,

	.set_fmt	= wm8523_set_dai_fmt,

};



struct snd_soc_dai wm8523_dai = {

	.name = "WM8523",

	.playback = {

		.stream_name = "Playback",

		.channels_min = 2,  /* Mono modes not yet supported */

		.channels_max = 2,

		.rates = WM8523_RATES,

		.formats = WM8523_FORMATS,

	},

	.ops = &wm8523_dai_ops,

};

EXPORT_SYMBOL_GPL(wm8523_dai);



#ifdef CONFIG_PM

static int wm8523_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;



	wm8523_set_bias_level(codec, SND_SOC_BIAS_OFF);

	return 0;

}



static int wm8523_resume(struct platform_device *pdev)

{

	struct snd_soc_device *socdev = platform_get_drvdata(pdev);

	struct snd_soc_codec *codec = socdev->card->codec;



	wm8523_set_bias_level(codec, SND_SOC_BIAS_STANDBY);



	return 0;

}

#else

#define wm8523_suspend NULL

#define wm8523_resume NULL

#endif



static int wm8523_probe(struct platform_device *pdev)

{

	struct snd_soc_device *socdev = platform_get_drvdata(pdev);

	struct snd_soc_codec *codec;

	int ret = 0;



	if (wm8523_codec == NULL) {

		dev_err(&pdev->dev, "Codec device not registered\n");

		return -ENODEV;

	}



	socdev->card->codec = wm8523_codec;

	codec = wm8523_codec;



	/* register pcms */

	ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);

	if (ret < 0) {

		dev_err(codec->dev, "failed to create pcms: %d\n", ret);

		goto pcm_err;

	}



	snd_soc_add_controls(codec, wm8523_snd_controls,

			     ARRAY_SIZE(wm8523_snd_controls));

	wm8523_add_widgets(codec);

	ret = snd_soc_init_card(socdev);

	if (ret < 0) {

		dev_err(codec->dev, "failed to register card: %d\n", ret);

		goto card_err;

	}



	return ret;



card_err:

	snd_soc_free_pcms(socdev);

	snd_soc_dapm_free(socdev);

pcm_err:

	return ret;

}



static int wm8523_remove(struct platform_device *pdev)

{

	struct snd_soc_device *socdev = platform_get_drvdata(pdev);



	snd_soc_free_pcms(socdev);

	snd_soc_dapm_free(socdev);



	return 0;

}



struct snd_soc_codec_device soc_codec_dev_wm8523 = {

	.probe = 	wm8523_probe,

	.remove = 	wm8523_remove,

	.suspend = 	wm8523_suspend,

	.resume =	wm8523_resume,

};

EXPORT_SYMBOL_GPL(soc_codec_dev_wm8523);



static int wm8523_register(struct wm8523_priv *wm8523)

{

	int ret;

	struct snd_soc_codec *codec = &wm8523->codec;

	int i;



	if (wm8523_codec) {

		dev_err(codec->dev, "Another WM8523 is registered\n");

		return -EINVAL;

	}



	mutex_init(&codec->mutex);

	INIT_LIST_HEAD(&codec->dapm_widgets);

	INIT_LIST_HEAD(&codec->dapm_paths);



	codec->private_data = wm8523;

	codec->name = "WM8523";

	codec->owner = THIS_MODULE;

	codec->read = wm8523_read;

	codec->write = wm8523_write;

	codec->bias_level = SND_SOC_BIAS_OFF;

	codec->set_bias_level = wm8523_set_bias_level;

	codec->dai = &wm8523_dai;

	codec->num_dai = 1;

	codec->reg_cache_size = WM8523_REGISTER_COUNT;

	codec->reg_cache = &wm8523->reg_cache;



	wm8523->rate_constraint.list = &wm8523->rate_constraint_list[0];

	wm8523->rate_constraint.count =

		ARRAY_SIZE(wm8523->rate_constraint_list);



	memcpy(codec->reg_cache, wm8523_reg, sizeof(wm8523_reg));



	for (i = 0; i < ARRAY_SIZE(wm8523->supplies); i++)

		wm8523->supplies[i].supply = wm8523_supply_names[i];



	ret = regulator_bulk_get(codec->dev, ARRAY_SIZE(wm8523->supplies),

				 wm8523->supplies);

	if (ret != 0) {

		dev_err(codec->dev, "Failed to request supplies: %d\n", ret);

		goto err;

	}



	ret = regulator_bulk_enable(ARRAY_SIZE(wm8523->supplies),

				    wm8523->supplies);

	if (ret != 0) {

		dev_err(codec->dev, "Failed to enable supplies: %d\n", ret);

		goto err_get;

	}



	ret = wm8523_read(codec, WM8523_DEVICE_ID);

	if (ret < 0) {

		dev_err(codec->dev, "Failed to read ID register\n");

		goto err_enable;

	}

	if (ret != wm8523_reg[WM8523_DEVICE_ID]) {

		dev_err(codec->dev, "Device is not a WM8523, ID is %x\n", ret);

		ret = -EINVAL;

		goto err_enable;

	}



	ret = wm8523_read(codec, WM8523_REVISION);

	if (ret < 0) {

		dev_err(codec->dev, "Failed to read revision register\n");

		goto err_enable;

	}

	dev_info(codec->dev, "revision %c\n",

		 (ret & WM8523_CHIP_REV_MASK) + 'A');



	ret = wm8523_reset(codec);

	if (ret < 0) {

		dev_err(codec->dev, "Failed to issue reset\n");

		goto err_enable;

	}



	wm8523_dai.dev = codec->dev;



	/* Change some default settings - latch VU and enable ZC */

	wm8523->reg_cache[WM8523_DAC_GAINR] |= WM8523_DACR_VU;

	wm8523->reg_cache[WM8523_DAC_CTRL3] |= WM8523_ZC;



	wm8523_set_bias_level(codec, SND_SOC_BIAS_STANDBY);



	/* Bias level configuration will have done an extra enable */

	regulator_bulk_disable(ARRAY_SIZE(wm8523->supplies), wm8523->supplies);



	wm8523_codec = codec;



	ret = snd_soc_register_codec(codec);

	if (ret != 0) {

		dev_err(codec->dev, "Failed to register codec: %d\n", ret);

		return ret;

	}



	ret = snd_soc_register_dai(&wm8523_dai);

	if (ret != 0) {

		dev_err(codec->dev, "Failed to register DAI: %d\n", ret);

		snd_soc_unregister_codec(codec);

		return ret;

	}



	return 0;



err_enable:

	regulator_bulk_disable(ARRAY_SIZE(wm8523->supplies), wm8523->supplies);

err_get:

	regulator_bulk_free(ARRAY_SIZE(wm8523->supplies), wm8523->supplies);

err:

	kfree(wm8523);

	return ret;

}



static void wm8523_unregister(struct wm8523_priv *wm8523)

{

	wm8523_set_bias_level(&wm8523->codec, SND_SOC_BIAS_OFF);

	regulator_bulk_free(ARRAY_SIZE(wm8523->supplies), wm8523->supplies);

	snd_soc_unregister_dai(&wm8523_dai);

	snd_soc_unregister_codec(&wm8523->codec);

	kfree(wm8523);

	wm8523_codec = NULL;

}



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

static __devinit int wm8523_i2c_probe(struct i2c_client *i2c,

				      const struct i2c_device_id *id)

{

	struct wm8523_priv *wm8523;

	struct snd_soc_codec *codec;



	wm8523 = kzalloc(sizeof(struct wm8523_priv), GFP_KERNEL);

	if (wm8523 == NULL)

		return -ENOMEM;



	codec = &wm8523->codec;

	codec->hw_write = (hw_write_t)i2c_master_send;



	i2c_set_clientdata(i2c, wm8523);

	codec->control_data = i2c;



	codec->dev = &i2c->dev;



	return wm8523_register(wm8523);

}



static __devexit int wm8523_i2c_remove(struct i2c_client *client)

{

	struct wm8523_priv *wm8523 = i2c_get_clientdata(client);

	wm8523_unregister(wm8523);

	return 0;

}



#ifdef CONFIG_PM

static int wm8523_i2c_suspend(struct i2c_client *i2c, pm_message_t msg)

{

	return snd_soc_suspend_device(&i2c->dev);

}



static int wm8523_i2c_resume(struct i2c_client *i2c)

{

	return snd_soc_resume_device(&i2c->dev);

}

#else

#define wm8523_i2c_suspend NULL

#define wm8523_i2c_resume NULL

#endif



static const struct i2c_device_id wm8523_i2c_id[] = {

	{ "wm8523", 0 },

	{ }

};

MODULE_DEVICE_TABLE(i2c, wm8523_i2c_id);



static struct i2c_driver wm8523_i2c_driver = {

	.driver = {

		.name = "WM8523",

		.owner = THIS_MODULE,

	},

	.probe =    wm8523_i2c_probe,

	.remove =   __devexit_p(wm8523_i2c_remove),

	.suspend =  wm8523_i2c_suspend,

	.resume =   wm8523_i2c_resume,

	.id_table = wm8523_i2c_id,

};

#endif



static int __init wm8523_modinit(void)

{

	int ret;

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

	ret = i2c_add_driver(&wm8523_i2c_driver);

	if (ret != 0) {

		printk(KERN_ERR "Failed to register WM8523 I2C driver: %d\n",

		       ret);

	}

#endif

	return 0;

}

module_init(wm8523_modinit);



static void __exit wm8523_exit(void)

{

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

	i2c_del_driver(&wm8523_i2c_driver);

#endif

}

module_exit(wm8523_exit);



MODULE_DESCRIPTION("ASoC WM8523 driver");

MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");

MODULE_LICENSE("GPL");

sound/soc/codecs/wm8523.h

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