sound/soc/codecs/wm8523.c - kernel/msm-4.9 - Gitiles

 /*
  * 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 <linux/slab.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");
	/*
	* 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 <linux/slab.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");