[deliverable/linux.git] / sound / soc / codecs / wm8523.c

/*
 * 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_register(unsigned int reg)
{
	switch (reg) {
	case WM8523_DEVICE_ID:
	case WM8523_REVISION:
		return 1;
	default:
		return 0;
	}
}

static int wm8523_reset(struct snd_soc_codec *codec)
{
	return snd_soc_write(codec, WM8523_DEVICE_ID, 0);
}

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));

	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 = snd_soc_read(codec, WM8523_AIF_CTRL1);
	u16 aifctrl2 = snd_soc_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;
	}

	snd_soc_write(codec, WM8523_AIF_CTRL1, aifctrl1);
	snd_soc_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 = snd_soc_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;
	}

	snd_soc_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++)
				snd_soc_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);

	return ret;

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,
			   enum snd_soc_control_type control)
{
	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->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;
	codec->volatile_register = wm8523_volatile_register;

	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));

	ret = snd_soc_codec_set_cache_io(codec, 8, 16, control);
	if (ret != 0) {
		dev_err(codec->dev, "Failed to set cache I/O: %d\n", ret);
		goto err;
	}

	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 = snd_soc_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 = snd_soc_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, SND_SOC_I2C);
}

static __devexit int wm8523_i2c_remove(struct i2c_client *client)
{
	struct wm8523_priv *wm8523 = i2c_get_clientdata(client);
	wm8523_unregister(wm8523);
	return 0;
}

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),
	.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");
Commit	Line	Data
1dcf98ff MB	1	/*
	2	* wm8523.c -- WM8523 ALSA SoC Audio driver
	3	*
	4	* Copyright 2009 Wolfson Microelectronics plc
	5	*
	6	* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
	7	*
	8	*
	9	* This program is free software; you can redistribute it and/or modify
	10	* it under the terms of the GNU General Public License version 2 as
	11	* published by the Free Software Foundation.
	12	*/
	13
	14	#include <linux/module.h>
	15	#include <linux/moduleparam.h>
	16	#include <linux/init.h>
	17	#include <linux/delay.h>
	18	#include <linux/pm.h>
	19	#include <linux/i2c.h>
	20	#include <linux/platform_device.h>
	21	#include <linux/regulator/consumer.h>
	22	#include <sound/core.h>
	23	#include <sound/pcm.h>
	24	#include <sound/pcm_params.h>
	25	#include <sound/soc.h>
	26	#include <sound/soc-dapm.h>
	27	#include <sound/initval.h>
	28	#include <sound/tlv.h>
	29
	30	#include "wm8523.h"
	31
	32	static struct snd_soc_codec *wm8523_codec;
	33	struct snd_soc_codec_device soc_codec_dev_wm8523;
	34
	35	#define WM8523_NUM_SUPPLIES 2
	36	static const char *wm8523_supply_names[WM8523_NUM_SUPPLIES] = {
	37	"AVDD",
	38	"LINEVDD",
	39	};
	40
	41	#define WM8523_NUM_RATES 7
	42
	43	/* codec private data */
	44	struct wm8523_priv {
	45	struct snd_soc_codec codec;
	46	u16 reg_cache[WM8523_REGISTER_COUNT];
	47	struct regulator_bulk_data supplies[WM8523_NUM_SUPPLIES];
	48	unsigned int sysclk;
	49	unsigned int rate_constraint_list[WM8523_NUM_RATES];
	50	struct snd_pcm_hw_constraint_list rate_constraint;
	51	};
	52
	53	static const u16 wm8523_reg[WM8523_REGISTER_COUNT] = {
	54	0x8523, /* R0 - DEVICE_ID */
	55	0x0001, /* R1 - REVISION */
	56	0x0000, /* R2 - PSCTRL1 */
	57	0x1812, /* R3 - AIF_CTRL1 */
	58	0x0000, /* R4 - AIF_CTRL2 */
	59	0x0001, /* R5 - DAC_CTRL3 */
	60	0x0190, /* R6 - DAC_GAINL */
	61	0x0190, /* R7 - DAC_GAINR */
	62	0x0000, /* R8 - ZERO_DETECT */
	63	};
	64
8d50e447	65	static int wm8523_volatile_register(unsigned int reg)
1dcf98ff MB	66	{
	67	switch (reg) {
	68	case WM8523_DEVICE_ID:
	69	case WM8523_REVISION:
	70	return 1;
	71	default:
	72	return 0;
	73	}
	74	}
	75
1dcf98ff MB	76	static int wm8523_reset(struct snd_soc_codec *codec)
1dcf98ff MB	77	{
8d50e447	78	return snd_soc_write(codec, WM8523_DEVICE_ID, 0);
1dcf98ff MB	79	}
	80
	81	static const DECLARE_TLV_DB_SCALE(dac_tlv, -10000, 25, 0);
	82
	83	static const char *wm8523_zd_count_text[] = {
	84	"1024",
	85	"2048",
	86	};
	87
	88	static const struct soc_enum wm8523_zc_count =
	89	SOC_ENUM_SINGLE(WM8523_ZERO_DETECT, 0, 2, wm8523_zd_count_text);
	90
	91	static const struct snd_kcontrol_new wm8523_snd_controls[] = {
	92	SOC_DOUBLE_R_TLV("Playback Volume", WM8523_DAC_GAINL, WM8523_DAC_GAINR,
	93	0, 448, 0, dac_tlv),
	94	SOC_SINGLE("ZC Switch", WM8523_DAC_CTRL3, 4, 1, 0),
	95	SOC_SINGLE("Playback Deemphasis Switch", WM8523_AIF_CTRL1, 8, 1, 0),
	96	SOC_DOUBLE("Playback Switch", WM8523_DAC_CTRL3, 2, 3, 1, 1),
	97	SOC_SINGLE("Volume Ramp Up Switch", WM8523_DAC_CTRL3, 1, 1, 0),
	98	SOC_SINGLE("Volume Ramp Down Switch", WM8523_DAC_CTRL3, 0, 1, 0),
	99	SOC_ENUM("Zero Detect Count", wm8523_zc_count),
	100	};
	101
	102	static const struct snd_soc_dapm_widget wm8523_dapm_widgets[] = {
	103	SND_SOC_DAPM_DAC("DAC", "Playback", SND_SOC_NOPM, 0, 0),
	104	SND_SOC_DAPM_OUTPUT("LINEVOUTL"),
	105	SND_SOC_DAPM_OUTPUT("LINEVOUTR"),
	106	};
	107
	108	static const struct snd_soc_dapm_route intercon[] = {
	109	{ "LINEVOUTL", NULL, "DAC" },
	110	{ "LINEVOUTR", NULL, "DAC" },
	111	};
	112
	113	static int wm8523_add_widgets(struct snd_soc_codec *codec)
	114	{
	115	snd_soc_dapm_new_controls(codec, wm8523_dapm_widgets,
	116	ARRAY_SIZE(wm8523_dapm_widgets));
	117
	118	snd_soc_dapm_add_routes(codec, intercon, ARRAY_SIZE(intercon));
	119
1dcf98ff MB	120	return 0;
	121	}
	122
	123	static struct {
	124	int value;
	125	int ratio;
	126	} lrclk_ratios[WM8523_NUM_RATES] = {
	127	{ 1, 128 },
	128	{ 2, 192 },
	129	{ 3, 256 },
	130	{ 4, 384 },
	131	{ 5, 512 },
	132	{ 6, 768 },
	133	{ 7, 1152 },
	134	};
	135
	136	static int wm8523_startup(struct snd_pcm_substream *substream,
	137	struct snd_soc_dai *dai)
	138	{
	139	struct snd_soc_codec *codec = dai->codec;
	140	struct wm8523_priv *wm8523 = codec->private_data;
	141
	142	/* The set of sample rates that can be supported depends on the
	143	* MCLK supplied to the CODEC - enforce this.
	144	*/
	145	if (!wm8523->sysclk) {
	146	dev_err(codec->dev,
	147	"No MCLK configured, call set_sysclk() on init\n");
	148	return -EINVAL;
	149	}
	150
	151	return 0;
	152	snd_pcm_hw_constraint_list(substream->runtime, 0,
	153	SNDRV_PCM_HW_PARAM_RATE,
	154	&wm8523->rate_constraint);
	155
	156	return 0;
	157	}
	158
	159	static int wm8523_hw_params(struct snd_pcm_substream *substream,
	160	struct snd_pcm_hw_params *params,
	161	struct snd_soc_dai *dai)
	162	{
	163	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	164	struct snd_soc_device *socdev = rtd->socdev;
	165	struct snd_soc_codec *codec = socdev->card->codec;
	166	struct wm8523_priv *wm8523 = codec->private_data;
	167	int i;
8d50e447 MB	168	u16 aifctrl1 = snd_soc_read(codec, WM8523_AIF_CTRL1);
8d50e447 MB	169	u16 aifctrl2 = snd_soc_read(codec, WM8523_AIF_CTRL2);
1dcf98ff MB	170
	171	/* Find a supported LRCLK ratio */
	172	for (i = 0; i < ARRAY_SIZE(lrclk_ratios); i++) {
	173	if (wm8523->sysclk / params_rate(params) ==
	174	lrclk_ratios[i].ratio)
	175	break;
	176	}
	177
	178	/* Should never happen, should be handled by constraints */
	179	if (i == ARRAY_SIZE(lrclk_ratios)) {
	180	dev_err(codec->dev, "MCLK/fs ratio %d unsupported\n",
	181	wm8523->sysclk / params_rate(params));
	182	return -EINVAL;
	183	}
	184
	185	aifctrl2 &= ~WM8523_SR_MASK;
	186	aifctrl2 \|= lrclk_ratios[i].value;
	187
	188	aifctrl1 &= ~WM8523_WL_MASK;
	189	switch (params_format(params)) {
	190	case SNDRV_PCM_FORMAT_S16_LE:
	191	break;
	192	case SNDRV_PCM_FORMAT_S20_3LE:
	193	aifctrl1 \|= 0x8;
	194	break;
	195	case SNDRV_PCM_FORMAT_S24_LE:
	196	aifctrl1 \|= 0x10;
	197	break;
	198	case SNDRV_PCM_FORMAT_S32_LE:
	199	aifctrl1 \|= 0x18;
	200	break;
	201	}
	202
8d50e447 MB	203	snd_soc_write(codec, WM8523_AIF_CTRL1, aifctrl1);
8d50e447 MB	204	snd_soc_write(codec, WM8523_AIF_CTRL2, aifctrl2);
1dcf98ff MB	205
	206	return 0;
	207	}
	208
	209	static int wm8523_set_dai_sysclk(struct snd_soc_dai *codec_dai,
	210	int clk_id, unsigned int freq, int dir)
	211	{
	212	struct snd_soc_codec *codec = codec_dai->codec;
	213	struct wm8523_priv *wm8523 = codec->private_data;
	214	unsigned int val;
	215	int i;
	216
	217	wm8523->sysclk = freq;
	218
	219	wm8523->rate_constraint.count = 0;
	220	for (i = 0; i < ARRAY_SIZE(lrclk_ratios); i++) {
	221	val = freq / lrclk_ratios[i].ratio;
	222	/* Check that it's a standard rate since core can't
	223	* cope with others and having the odd rates confuses
	224	* constraint matching.
	225	*/
	226	switch (val) {
	227	case 8000:
	228	case 11025:
	229	case 16000:
	230	case 22050:
	231	case 32000:
	232	case 44100:
	233	case 48000:
	234	case 64000:
	235	case 88200:
	236	case 96000:
	237	case 176400:
	238	case 192000:
	239	dev_dbg(codec->dev, "Supported sample rate: %dHz\n",
	240	val);
	241	wm8523->rate_constraint_list[i] = val;
	242	wm8523->rate_constraint.count++;
	243	break;
	244	default:
	245	dev_dbg(codec->dev, "Skipping sample rate: %dHz\n",
	246	val);
	247	}
	248	}
	249
	250	/* Need at least one supported rate... */
	251	if (wm8523->rate_constraint.count == 0)
	252	return -EINVAL;
	253
	254	return 0;
	255	}
	256
	257
	258	static int wm8523_set_dai_fmt(struct snd_soc_dai *codec_dai,
	259	unsigned int fmt)
	260	{
	261	struct snd_soc_codec *codec = codec_dai->codec;
8d50e447	262	u16 aifctrl1 = snd_soc_read(codec, WM8523_AIF_CTRL1);
1dcf98ff MB	263
	264	aifctrl1 &= ~(WM8523_BCLK_INV_MASK \| WM8523_LRCLK_INV_MASK \|
	265	WM8523_FMT_MASK \| WM8523_AIF_MSTR_MASK);
	266
	267	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
	268	case SND_SOC_DAIFMT_CBM_CFM:
	269	aifctrl1 \|= WM8523_AIF_MSTR;
	270	break;
	271	case SND_SOC_DAIFMT_CBS_CFS:
	272	break;
	273	default:
	274	return -EINVAL;
	275	}
	276
	277	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
	278	case SND_SOC_DAIFMT_I2S:
	279	aifctrl1 \|= 0x0002;
	280	break;
	281	case SND_SOC_DAIFMT_RIGHT_J:
	282	break;
	283	case SND_SOC_DAIFMT_LEFT_J:
	284	aifctrl1 \|= 0x0001;
	285	break;
	286	case SND_SOC_DAIFMT_DSP_A:
	287	aifctrl1 \|= 0x0003;
	288	break;
	289	case SND_SOC_DAIFMT_DSP_B:
	290	aifctrl1 \|= 0x0023;
	291	break;
	292	default:
	293	return -EINVAL;
	294	}
	295
	296	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
	297	case SND_SOC_DAIFMT_NB_NF:
	298	break;
	299	case SND_SOC_DAIFMT_IB_IF:
	300	aifctrl1 \|= WM8523_BCLK_INV \| WM8523_LRCLK_INV;
	301	break;
	302	case SND_SOC_DAIFMT_IB_NF:
	303	aifctrl1 \|= WM8523_BCLK_INV;
	304	break;
	305	case SND_SOC_DAIFMT_NB_IF:
	306	aifctrl1 \|= WM8523_LRCLK_INV;
	307	break;
	308	default:
	309	return -EINVAL;
	310	}
	311
8d50e447	312	snd_soc_write(codec, WM8523_AIF_CTRL1, aifctrl1);
1dcf98ff MB	313
	314	return 0;
	315	}
	316
	317	static int wm8523_set_bias_level(struct snd_soc_codec *codec,
	318	enum snd_soc_bias_level level)
	319	{
	320	struct wm8523_priv *wm8523 = codec->private_data;
	321	int ret, i;
	322
	323	switch (level) {
	324	case SND_SOC_BIAS_ON:
	325	break;
	326
	327	case SND_SOC_BIAS_PREPARE:
	328	/* Full power on */
	329	snd_soc_update_bits(codec, WM8523_PSCTRL1,
	330	WM8523_SYS_ENA_MASK, 3);
	331	break;
	332
	333	case SND_SOC_BIAS_STANDBY:
	334	if (codec->bias_level == SND_SOC_BIAS_OFF) {
	335	ret = regulator_bulk_enable(ARRAY_SIZE(wm8523->supplies),
	336	wm8523->supplies);
	337	if (ret != 0) {
	338	dev_err(codec->dev,
	339	"Failed to enable supplies: %d\n",
	340	ret);
	341	return ret;
	342	}
	343
	344	/* Initial power up */
	345	snd_soc_update_bits(codec, WM8523_PSCTRL1,
	346	WM8523_SYS_ENA_MASK, 1);
	347
	348	/* Sync back default/cached values */
	349	for (i = WM8523_AIF_CTRL1;
	350	i < WM8523_MAX_REGISTER; i++)
8d50e447	351	snd_soc_write(codec, i, wm8523->reg_cache[i]);
1dcf98ff MB	352
	353
	354	msleep(100);
	355	}
	356
	357	/* Power up to mute */
	358	snd_soc_update_bits(codec, WM8523_PSCTRL1,
	359	WM8523_SYS_ENA_MASK, 2);
	360
	361	break;
	362
	363	case SND_SOC_BIAS_OFF:
	364	/* The chip runs through the power down sequence for us. */
	365	snd_soc_update_bits(codec, WM8523_PSCTRL1,
	366	WM8523_SYS_ENA_MASK, 0);
	367	msleep(100);
	368
	369	regulator_bulk_disable(ARRAY_SIZE(wm8523->supplies),
	370	wm8523->supplies);
	371	break;
	372	}
	373	codec->bias_level = level;
	374	return 0;
	375	}
	376
	377	#define WM8523_RATES SNDRV_PCM_RATE_8000_192000
	378
	379	#define WM8523_FORMATS (SNDRV_PCM_FMTBIT_S16_LE \| SNDRV_PCM_FMTBIT_S20_3LE \|\
	380	SNDRV_PCM_FMTBIT_S24_LE \| SNDRV_PCM_FMTBIT_S32_LE)
	381
	382	static struct snd_soc_dai_ops wm8523_dai_ops = {
	383	.startup = wm8523_startup,
	384	.hw_params = wm8523_hw_params,
	385	.set_sysclk = wm8523_set_dai_sysclk,
	386	.set_fmt = wm8523_set_dai_fmt,
	387	};
	388
	389	struct snd_soc_dai wm8523_dai = {
	390	.name = "WM8523",
	391	.playback = {
	392	.stream_name = "Playback",
	393	.channels_min = 2, /* Mono modes not yet supported */
	394	.channels_max = 2,
	395	.rates = WM8523_RATES,
	396	.formats = WM8523_FORMATS,
	397	},
	398	.ops = &wm8523_dai_ops,
	399	};
	400	EXPORT_SYMBOL_GPL(wm8523_dai);
	401
	402	#ifdef CONFIG_PM
	403	static int wm8523_suspend(struct platform_device *pdev, pm_message_t state)
	404	{
	405	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
	406	struct snd_soc_codec *codec = socdev->card->codec;
	407
	408	wm8523_set_bias_level(codec, SND_SOC_BIAS_OFF);
	409	return 0;
	410	}
	411
	412	static int wm8523_resume(struct platform_device *pdev)
	413	{
	414	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
	415	struct snd_soc_codec *codec = socdev->card->codec;
416
417	wm8523_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
418
419	return 0;
420	}
421	#else
422	#define wm8523_suspend NULL
423	#define wm8523_resume NULL
424	#endif
425
426	static int wm8523_probe(struct platform_device *pdev)
427	{
428	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
429	struct snd_soc_codec *codec;
430	int ret = 0;
431
432	if (wm8523_codec == NULL) {
433	dev_err(&pdev->dev, "Codec device not registered\n");
434	return -ENODEV;
435	}
436
437	socdev->card->codec = wm8523_codec;
438	codec = wm8523_codec;
439
440	/* register pcms */
441	ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
442	if (ret < 0) {
443	dev_err(codec->dev, "failed to create pcms: %d\n", ret);
444	goto pcm_err;
445	}
446
447	snd_soc_add_controls(codec, wm8523_snd_controls,
448	ARRAY_SIZE(wm8523_snd_controls));
449	wm8523_add_widgets(codec);
1dcf98ff MB	450
	451	return ret;
	452
1dcf98ff MB	453	pcm_err:
	454	return ret;
	455	}
	456
	457	static int wm8523_remove(struct platform_device *pdev)
	458	{
	459	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
	460
	461	snd_soc_free_pcms(socdev);
	462	snd_soc_dapm_free(socdev);
	463
	464	return 0;
	465	}
	466
	467	struct snd_soc_codec_device soc_codec_dev_wm8523 = {
	468	.probe = wm8523_probe,
	469	.remove = wm8523_remove,
	470	.suspend = wm8523_suspend,
	471	.resume = wm8523_resume,
	472	};
	473	EXPORT_SYMBOL_GPL(soc_codec_dev_wm8523);
	474
8d50e447 MB	475	static int wm8523_register(struct wm8523_priv *wm8523,
8d50e447 MB	476	enum snd_soc_control_type control)
1dcf98ff MB	477	{
	478	int ret;
	479	struct snd_soc_codec *codec = &wm8523->codec;
	480	int i;
	481
	482	if (wm8523_codec) {
	483	dev_err(codec->dev, "Another WM8523 is registered\n");
	484	return -EINVAL;
	485	}
	486
	487	mutex_init(&codec->mutex);
	488	INIT_LIST_HEAD(&codec->dapm_widgets);
	489	INIT_LIST_HEAD(&codec->dapm_paths);
	490
	491	codec->private_data = wm8523;
	492	codec->name = "WM8523";
	493	codec->owner = THIS_MODULE;
1dcf98ff MB	494	codec->bias_level = SND_SOC_BIAS_OFF;
	495	codec->set_bias_level = wm8523_set_bias_level;
	496	codec->dai = &wm8523_dai;
	497	codec->num_dai = 1;
	498	codec->reg_cache_size = WM8523_REGISTER_COUNT;
	499	codec->reg_cache = &wm8523->reg_cache;
8d50e447	500	codec->volatile_register = wm8523_volatile_register;
1dcf98ff MB	501
	502	wm8523->rate_constraint.list = &wm8523->rate_constraint_list[0];
	503	wm8523->rate_constraint.count =
	504	ARRAY_SIZE(wm8523->rate_constraint_list);
	505
	506	memcpy(codec->reg_cache, wm8523_reg, sizeof(wm8523_reg));
	507
8d50e447 MB	508	ret = snd_soc_codec_set_cache_io(codec, 8, 16, control);
	509	if (ret != 0) {
	510	dev_err(codec->dev, "Failed to set cache I/O: %d\n", ret);
	511	goto err;
	512	}
	513
1dcf98ff MB	514	for (i = 0; i < ARRAY_SIZE(wm8523->supplies); i++)
	515	wm8523->supplies[i].supply = wm8523_supply_names[i];
	516
	517	ret = regulator_bulk_get(codec->dev, ARRAY_SIZE(wm8523->supplies),
	518	wm8523->supplies);
	519	if (ret != 0) {
	520	dev_err(codec->dev, "Failed to request supplies: %d\n", ret);
	521	goto err;
	522	}
	523
	524	ret = regulator_bulk_enable(ARRAY_SIZE(wm8523->supplies),
	525	wm8523->supplies);
	526	if (ret != 0) {
	527	dev_err(codec->dev, "Failed to enable supplies: %d\n", ret);
	528	goto err_get;
	529	}
	530
8d50e447	531	ret = snd_soc_read(codec, WM8523_DEVICE_ID);
1dcf98ff MB	532	if (ret < 0) {
	533	dev_err(codec->dev, "Failed to read ID register\n");
	534	goto err_enable;
	535	}
	536	if (ret != wm8523_reg[WM8523_DEVICE_ID]) {
	537	dev_err(codec->dev, "Device is not a WM8523, ID is %x\n", ret);
	538	ret = -EINVAL;
	539	goto err_enable;
	540	}
	541
8d50e447	542	ret = snd_soc_read(codec, WM8523_REVISION);
1dcf98ff MB	543	if (ret < 0) {
	544	dev_err(codec->dev, "Failed to read revision register\n");
	545	goto err_enable;
	546	}
	547	dev_info(codec->dev, "revision %c\n",
	548	(ret & WM8523_CHIP_REV_MASK) + 'A');
	549
	550	ret = wm8523_reset(codec);
	551	if (ret < 0) {
	552	dev_err(codec->dev, "Failed to issue reset\n");
	553	goto err_enable;
	554	}
	555
	556	wm8523_dai.dev = codec->dev;
	557
	558	/* Change some default settings - latch VU and enable ZC */
	559	wm8523->reg_cache[WM8523_DAC_GAINR] \|= WM8523_DACR_VU;
	560	wm8523->reg_cache[WM8523_DAC_CTRL3] \|= WM8523_ZC;
	561
	562	wm8523_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
	563
	564	/* Bias level configuration will have done an extra enable */
	565	regulator_bulk_disable(ARRAY_SIZE(wm8523->supplies), wm8523->supplies);
	566
	567	wm8523_codec = codec;
	568
	569	ret = snd_soc_register_codec(codec);
	570	if (ret != 0) {
	571	dev_err(codec->dev, "Failed to register codec: %d\n", ret);
	572	return ret;
	573	}
	574
	575	ret = snd_soc_register_dai(&wm8523_dai);
	576	if (ret != 0) {
	577	dev_err(codec->dev, "Failed to register DAI: %d\n", ret);
	578	snd_soc_unregister_codec(codec);
	579	return ret;
	580	}
	581
	582	return 0;
	583
	584	err_enable:
	585	regulator_bulk_disable(ARRAY_SIZE(wm8523->supplies), wm8523->supplies);
	586	err_get:
	587	regulator_bulk_free(ARRAY_SIZE(wm8523->supplies), wm8523->supplies);
	588	err:
	589	kfree(wm8523);
	590	return ret;
	591	}
	592
	593	static void wm8523_unregister(struct wm8523_priv *wm8523)
	594	{
	595	wm8523_set_bias_level(&wm8523->codec, SND_SOC_BIAS_OFF);
	596	regulator_bulk_free(ARRAY_SIZE(wm8523->supplies), wm8523->supplies);
	597	snd_soc_unregister_dai(&wm8523_dai);
	598	snd_soc_unregister_codec(&wm8523->codec);
	599	kfree(wm8523);
	600	wm8523_codec = NULL;
	601	}
	602
	603	#if defined(CONFIG_I2C) \|\| defined(CONFIG_I2C_MODULE)
	604	static __devinit int wm8523_i2c_probe(struct i2c_client *i2c,
	605	const struct i2c_device_id *id)
	606	{
607	struct wm8523_priv *wm8523;
608	struct snd_soc_codec *codec;
609
610	wm8523 = kzalloc(sizeof(struct wm8523_priv), GFP_KERNEL);
611	if (wm8523 == NULL)
612	return -ENOMEM;
613
614	codec = &wm8523->codec;
615	codec->hw_write = (hw_write_t)i2c_master_send;
616
617	i2c_set_clientdata(i2c, wm8523);
618	codec->control_data = i2c;
619
620	codec->dev = &i2c->dev;
621
8d50e447	622	return wm8523_register(wm8523, SND_SOC_I2C);
1dcf98ff MB	623	}
	624
	625	static __devexit int wm8523_i2c_remove(struct i2c_client *client)
	626	{
	627	struct wm8523_priv *wm8523 = i2c_get_clientdata(client);
	628	wm8523_unregister(wm8523);
	629	return 0;
	630	}
	631
1dcf98ff MB	632	static const struct i2c_device_id wm8523_i2c_id[] = {
	633	{ "wm8523", 0 },
	634	{ }
	635	};
	636	MODULE_DEVICE_TABLE(i2c, wm8523_i2c_id);
	637
	638	static struct i2c_driver wm8523_i2c_driver = {
	639	.driver = {
	640	.name = "WM8523",
	641	.owner = THIS_MODULE,
	642	},
	643	.probe = wm8523_i2c_probe,
	644	.remove = __devexit_p(wm8523_i2c_remove),
1dcf98ff MB	645	.id_table = wm8523_i2c_id,
	646	};
	647	#endif
	648
	649	static int __init wm8523_modinit(void)
	650	{
	651	int ret;
	652	#if defined(CONFIG_I2C) \|\| defined(CONFIG_I2C_MODULE)
	653	ret = i2c_add_driver(&wm8523_i2c_driver);
	654	if (ret != 0) {
	655	printk(KERN_ERR "Failed to register WM8523 I2C driver: %d\n",
	656	ret);
	657	}
	658	#endif
	659	return 0;
	660	}
	661	module_init(wm8523_modinit);
	662
	663	static void __exit wm8523_exit(void)
	664	{
	665	#if defined(CONFIG_I2C) \|\| defined(CONFIG_I2C_MODULE)
	666	i2c_del_driver(&wm8523_i2c_driver);
	667	#endif
	668	}
	669	module_exit(wm8523_exit);
	670
	671	MODULE_DESCRIPTION("ASoC WM8523 driver");
	672	MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
	673	MODULE_LICENSE("GPL");