sound/soc/codecs/wm8741.c - fp2-dev/kernel/msm - Gitiles

 /*
  * wm8741.c  --  WM8741 ALSA SoC Audio driver
  *
  * Copyright 2010 Wolfson Microelectronics plc
  *
  * Author: Ian Lartey <ian@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 "wm8741.h"

 #define WM8741_NUM_SUPPLIES 2
 static const char *wm8741_supply_names[WM8741_NUM_SUPPLIES] = {
 	"AVDD",
 	"DVDD",
 };

 #define WM8741_NUM_RATES 4

 /* codec private data */
 struct wm8741_priv {
 	enum snd_soc_control_type control_type;
 	u16 reg_cache[WM8741_REGISTER_COUNT];
 	struct regulator_bulk_data supplies[WM8741_NUM_SUPPLIES];
 	unsigned int sysclk;
 	unsigned int rate_constraint_list[WM8741_NUM_RATES];
 	struct snd_pcm_hw_constraint_list rate_constraint;
 };

 static const u16 wm8741_reg_defaults[WM8741_REGISTER_COUNT] = {
 	0x0000,     /* R0  - DACLLSB Attenuation */
 	0x0000,     /* R1  - DACLMSB Attenuation */
 	0x0000,     /* R2  - DACRLSB Attenuation */
 	0x0000,     /* R3  - DACRMSB Attenuation */
 	0x0000,     /* R4  - Volume Control */
 	0x000A,     /* R5  - Format Control */
 	0x0000,     /* R6  - Filter Control */
 	0x0000,     /* R7  - Mode Control 1 */
 	0x0002,     /* R8  - Mode Control 2 */
 	0x0000,	    /* R9  - Reset */
 	0x0002,     /* R32 - ADDITONAL_CONTROL_1 */
 };


 static int wm8741_reset(struct snd_soc_codec *codec)
 {
 	return snd_soc_write(codec, WM8741_RESET, 0);
 }

 static const DECLARE_TLV_DB_SCALE(dac_tlv_fine, -12700, 13, 0);
 static const DECLARE_TLV_DB_SCALE(dac_tlv, -12700, 400, 0);

 static const struct snd_kcontrol_new wm8741_snd_controls[] = {
 SOC_DOUBLE_R_TLV("Fine Playback Volume", WM8741_DACLLSB_ATTENUATION,
 		 WM8741_DACRLSB_ATTENUATION, 1, 255, 1, dac_tlv_fine),
 SOC_DOUBLE_R_TLV("Playback Volume", WM8741_DACLMSB_ATTENUATION,
 		 WM8741_DACRMSB_ATTENUATION, 0, 511, 1, dac_tlv),
 };

 static const struct snd_soc_dapm_widget wm8741_dapm_widgets[] = {
 SND_SOC_DAPM_DAC("DACL", "Playback", SND_SOC_NOPM, 0, 0),
 SND_SOC_DAPM_DAC("DACR", "Playback", SND_SOC_NOPM, 0, 0),
 SND_SOC_DAPM_OUTPUT("VOUTLP"),
 SND_SOC_DAPM_OUTPUT("VOUTLN"),
 SND_SOC_DAPM_OUTPUT("VOUTRP"),
 SND_SOC_DAPM_OUTPUT("VOUTRN"),
 };

 static const struct snd_soc_dapm_route intercon[] = {
 	{ "VOUTLP", NULL, "DACL" },
 	{ "VOUTLN", NULL, "DACL" },
 	{ "VOUTRP", NULL, "DACR" },
 	{ "VOUTRN", NULL, "DACR" },
 };

 static int wm8741_add_widgets(struct snd_soc_codec *codec)
 {
 	snd_soc_dapm_new_controls(codec, wm8741_dapm_widgets,
 				  ARRAY_SIZE(wm8741_dapm_widgets));

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

 	return 0;
 }

 static struct {
 	int value;
 	int ratio;
 } lrclk_ratios[WM8741_NUM_RATES] = {
 	{ 1, 256 },
 	{ 2, 384 },
 	{ 3, 512 },
 	{ 4, 768 },
 };


 static int wm8741_startup(struct snd_pcm_substream *substream,
 			  struct snd_soc_dai *dai)
 {
 	struct snd_soc_codec *codec = dai->codec;
 	struct wm8741_priv *wm8741 = snd_soc_codec_get_drvdata(codec);

 	/* The set of sample rates that can be supported depends on the
 	 * MCLK supplied to the CODEC - enforce this.
 	 */
 	if (!wm8741->sysclk) {
 		dev_err(codec->dev,
 			"No MCLK configured, call set_sysclk() on init\n");
 		return -EINVAL;
 	}

 	snd_pcm_hw_constraint_list(substream->runtime, 0,
 				   SNDRV_PCM_HW_PARAM_RATE,
 				   &wm8741->rate_constraint);

 	return 0;
 }

 static int wm8741_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;
 	struct wm8741_priv *wm8741 = snd_soc_codec_get_drvdata(codec);
 	u16 iface = snd_soc_read(codec, WM8741_FORMAT_CONTROL) & 0x1FC;
 	int i;

 	/* Find a supported LRCLK ratio */
 	for (i = 0; i < ARRAY_SIZE(lrclk_ratios); i++) {
 		if (wm8741->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",
 			wm8741->sysclk / params_rate(params));
 		return -EINVAL;
 	}

 	/* bit size */
 	switch (params_format(params)) {
 	case SNDRV_PCM_FORMAT_S16_LE:
 		break;
 	case SNDRV_PCM_FORMAT_S20_3LE:
 		iface |= 0x0001;
 		break;
 	case SNDRV_PCM_FORMAT_S24_LE:
 		iface |= 0x0002;
 		break;
 	case SNDRV_PCM_FORMAT_S32_LE:
 		iface |= 0x0003;
 		break;
 	default:
 		dev_dbg(codec->dev, "wm8741_hw_params:    Unsupported bit size param = %d",
 			params_format(params));
 		return -EINVAL;
 	}

 	dev_dbg(codec->dev, "wm8741_hw_params:    bit size param = %d",
 		params_format(params));

 	snd_soc_write(codec, WM8741_FORMAT_CONTROL, iface);
 	return 0;
 }

 static int wm8741_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 wm8741_priv *wm8741 = snd_soc_codec_get_drvdata(codec);
 	unsigned int val;
 	int i;

 	dev_dbg(codec->dev, "wm8741_set_dai_sysclk info: freq=%dHz\n", freq);

 	wm8741->sysclk = freq;

 	wm8741->rate_constraint.count = 0;

 	for (i = 0; i < ARRAY_SIZE(lrclk_ratios); i++) {
 		dev_dbg(codec->dev, "index = %d, ratio = %d, freq = %d",
 				i, lrclk_ratios[i].ratio, freq);

 		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 32000:
 		case 44100:
 		case 48000:
 		case 64000:
 		case 88200:
 		case 96000:
 			dev_dbg(codec->dev, "Supported sample rate: %dHz\n",
 				val);
 			wm8741->rate_constraint_list[i] = val;
 			wm8741->rate_constraint.count++;
 			break;
 		default:
 			dev_dbg(codec->dev, "Skipping sample rate: %dHz\n",
 				val);
 		}
 	}

 	/* Need at least one supported rate... */
 	if (wm8741->rate_constraint.count == 0)
 		return -EINVAL;

 	return 0;
 }

 static int wm8741_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, WM8741_FORMAT_CONTROL) & 0x1C3;

 	/* check master/slave audio interface */
 	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 	case SND_SOC_DAIFMT_CBS_CFS:
 		break;
 	default:
 		return -EINVAL;
 	}

 	/* interface format */
 	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 	case SND_SOC_DAIFMT_I2S:
 		iface |= 0x0008;
 		break;
 	case SND_SOC_DAIFMT_RIGHT_J:
 		break;
 	case SND_SOC_DAIFMT_LEFT_J:
 		iface |= 0x0004;
 		break;
 	case SND_SOC_DAIFMT_DSP_A:
 		iface |= 0x0003;
 		break;
 	case SND_SOC_DAIFMT_DSP_B:
 		iface |= 0x0013;
 		break;
 	default:
 		return -EINVAL;
 	}

 	/* clock inversion */
 	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 	case SND_SOC_DAIFMT_NB_NF:
 		break;
 	case SND_SOC_DAIFMT_IB_IF:
 		iface |= 0x0010;
 		break;
 	case SND_SOC_DAIFMT_IB_NF:
 		iface |= 0x0020;
 		break;
 	case SND_SOC_DAIFMT_NB_IF:
 		iface |= 0x0030;
 		break;
 	default:
 		return -EINVAL;
 	}


 	dev_dbg(codec->dev, "wm8741_set_dai_fmt:    Format=%x, Clock Inv=%x\n",
 				fmt & SND_SOC_DAIFMT_FORMAT_MASK,
 				((fmt & SND_SOC_DAIFMT_INV_MASK)));

 	snd_soc_write(codec, WM8741_FORMAT_CONTROL, iface);
 	return 0;
 }

 #define WM8741_RATES (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
 			SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 | \
 			SNDRV_PCM_RATE_96000 | SNDRV_PCM_RATE_176400 | \
 			SNDRV_PCM_RATE_192000)

 #define WM8741_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 wm8741_dai_ops = {
 	.startup	= wm8741_startup,
 	.hw_params	= wm8741_hw_params,
 	.set_sysclk	= wm8741_set_dai_sysclk,
 	.set_fmt	= wm8741_set_dai_fmt,
 };

 static struct snd_soc_dai_driver wm8741_dai = {
 	.name = "WM8741",
 	.playback = {
 		.stream_name = "Playback",
 		.channels_min = 2,  /* Mono modes not yet supported */
 		.channels_max = 2,
 		.rates = WM8741_RATES,
 		.formats = WM8741_FORMATS,
 	},
 	.ops = &wm8741_dai_ops,
 };

 #ifdef CONFIG_PM
 static int wm8741_resume(struct snd_soc_codec *codec)
 {
 	u16 *cache = codec->reg_cache;
 	int i;

 	/* RESTORE REG Cache */
 	for (i = 0; i < WM8741_REGISTER_COUNT; i++) {
 		if (cache[i] == wm8741_reg_defaults[i] || WM8741_RESET == i)
 			continue;
 		snd_soc_write(codec, i, cache[i]);
 	}
 	return 0;
 }
 #else
 #define wm8741_suspend NULL
 #define wm8741_resume NULL
 #endif

 static int wm8741_probe(struct snd_soc_codec *codec)
 {
 	struct wm8741_priv *wm8741 = snd_soc_codec_get_drvdata(codec);
 	int ret = 0;

 	ret = snd_soc_codec_set_cache_io(codec, 7, 9, wm8741->control_type);
 	if (ret != 0) {
 		dev_err(codec->dev, "Failed to set cache I/O: %d\n", ret);
 		return ret;
 	}

 	ret = wm8741_reset(codec);
 	if (ret < 0) {
 		dev_err(codec->dev, "Failed to issue reset\n");
 		return ret;
 	}

 	/* Change some default settings - latch VU */
 	wm8741->reg_cache[WM8741_DACLLSB_ATTENUATION] |= WM8741_UPDATELL;
 	wm8741->reg_cache[WM8741_DACLMSB_ATTENUATION] |= WM8741_UPDATELM;
 	wm8741->reg_cache[WM8741_DACRLSB_ATTENUATION] |= WM8741_UPDATERL;
 	wm8741->reg_cache[WM8741_DACRLSB_ATTENUATION] |= WM8741_UPDATERM;

 	snd_soc_add_controls(codec, wm8741_snd_controls,
 			     ARRAY_SIZE(wm8741_snd_controls));
 	wm8741_add_widgets(codec);

 	dev_dbg(codec->dev, "Successful registration\n");
 	return ret;
 }

 static struct snd_soc_codec_driver soc_codec_dev_wm8741 = {
 	.probe =	wm8741_probe,
 	.resume =	wm8741_resume,
 	.reg_cache_size = sizeof(wm8741_reg_defaults),
 	.reg_word_size = sizeof(u16),
 	.reg_cache_default = &wm8741_reg_defaults,
 };

 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 static int wm8741_i2c_probe(struct i2c_client *i2c,
 			    const struct i2c_device_id *id)
 {
 	struct wm8741_priv *wm8741;
 	int ret, i;

 	wm8741 = kzalloc(sizeof(struct wm8741_priv), GFP_KERNEL);
 	if (wm8741 == NULL)
 		return -ENOMEM;

 	wm8741->rate_constraint.list = &wm8741->rate_constraint_list[0];
 	wm8741->rate_constraint.count =
 		ARRAY_SIZE(wm8741->rate_constraint_list);

 	for (i = 0; i < ARRAY_SIZE(wm8741->supplies); i++)
 		wm8741->supplies[i].supply = wm8741_supply_names[i];

 	ret = regulator_bulk_get(&i2c->dev, ARRAY_SIZE(wm8741->supplies),
 				 wm8741->supplies);
 	if (ret != 0) {
 		dev_err(&i2c->dev, "Failed to request supplies: %d\n", ret);
 		goto err;
 	}

 	ret = regulator_bulk_enable(ARRAY_SIZE(wm8741->supplies),
 				    wm8741->supplies);
 	if (ret != 0) {
 		dev_err(&i2c->dev, "Failed to enable supplies: %d\n", ret);
 		goto err_get;
 	}

 	i2c_set_clientdata(i2c, wm8741);
 	wm8741->control_type = SND_SOC_I2C;

 	ret =  snd_soc_register_codec(&i2c->dev,
 			&soc_codec_dev_wm8741, &wm8741_dai, 1);
 	if (ret < 0)
 		goto err_enable;
 	return ret;

 err_enable:
 	regulator_bulk_disable(ARRAY_SIZE(wm8741->supplies), wm8741->supplies);

 err_get:
 	regulator_bulk_free(ARRAY_SIZE(wm8741->supplies), wm8741->supplies);
 err:
 	kfree(wm8741);
 	return ret;
 }

 static int wm8741_i2c_remove(struct i2c_client *client)
 {
 	struct wm8741_priv *wm8741 = i2c_get_clientdata(client);

 	snd_soc_unregister_codec(&client->dev);
 	regulator_bulk_free(ARRAY_SIZE(wm8741->supplies), wm8741->supplies);
 	kfree(i2c_get_clientdata(client));
 	return 0;
 }

 static const struct i2c_device_id wm8741_i2c_id[] = {
 	{ "wm8741", 0 },
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, wm8741_i2c_id);

 static struct i2c_driver wm8741_i2c_driver = {
 	.driver = {
 		.name = "wm8741-codec",
 		.owner = THIS_MODULE,
 	},
 	.probe =    wm8741_i2c_probe,
 	.remove =   wm8741_i2c_remove,
 	.id_table = wm8741_i2c_id,
 };
 #endif

 static int __init wm8741_modinit(void)
 {
 	int ret = 0;

 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 	ret = i2c_add_driver(&wm8741_i2c_driver);
 	if (ret != 0) {
 		pr_err("Failed to register WM8741 I2C driver: %d\n", ret);
 	}
 #endif

 	return ret;
 }
 module_init(wm8741_modinit);

 static void __exit wm8741_exit(void)
 {
 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 	i2c_del_driver(&wm8741_i2c_driver);
 #endif
 }
 module_exit(wm8741_exit);

 MODULE_DESCRIPTION("ASoC WM8741 driver");
 MODULE_AUTHOR("Ian Lartey <ian@opensource.wolfsonmicro.com>");
 MODULE_LICENSE("GPL");
	/*
	* wm8741.c -- WM8741 ALSA SoC Audio driver
	*
	* Copyright 2010 Wolfson Microelectronics plc
	*
	* Author: Ian Lartey <ian@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 "wm8741.h"

	#define WM8741_NUM_SUPPLIES 2
	static const char *wm8741_supply_names[WM8741_NUM_SUPPLIES] = {
	"AVDD",
	"DVDD",
	};

	#define WM8741_NUM_RATES 4

	/* codec private data */
	struct wm8741_priv {
	enum snd_soc_control_type control_type;
	u16 reg_cache[WM8741_REGISTER_COUNT];
	struct regulator_bulk_data supplies[WM8741_NUM_SUPPLIES];
	unsigned int sysclk;
	unsigned int rate_constraint_list[WM8741_NUM_RATES];
	struct snd_pcm_hw_constraint_list rate_constraint;
	};

	static const u16 wm8741_reg_defaults[WM8741_REGISTER_COUNT] = {
	0x0000, /* R0 - DACLLSB Attenuation */
	0x0000, /* R1 - DACLMSB Attenuation */
	0x0000, /* R2 - DACRLSB Attenuation */
	0x0000, /* R3 - DACRMSB Attenuation */
	0x0000, /* R4 - Volume Control */
	0x000A, /* R5 - Format Control */
	0x0000, /* R6 - Filter Control */
	0x0000, /* R7 - Mode Control 1 */
	0x0002, /* R8 - Mode Control 2 */
	0x0000, /* R9 - Reset */
	0x0002, /* R32 - ADDITONAL_CONTROL_1 */
	};


	static int wm8741_reset(struct snd_soc_codec *codec)
	{
	return snd_soc_write(codec, WM8741_RESET, 0);
	}

	static const DECLARE_TLV_DB_SCALE(dac_tlv_fine, -12700, 13, 0);
	static const DECLARE_TLV_DB_SCALE(dac_tlv, -12700, 400, 0);

	static const struct snd_kcontrol_new wm8741_snd_controls[] = {
	SOC_DOUBLE_R_TLV("Fine Playback Volume", WM8741_DACLLSB_ATTENUATION,
	WM8741_DACRLSB_ATTENUATION, 1, 255, 1, dac_tlv_fine),
	SOC_DOUBLE_R_TLV("Playback Volume", WM8741_DACLMSB_ATTENUATION,
	WM8741_DACRMSB_ATTENUATION, 0, 511, 1, dac_tlv),
	};

	static const struct snd_soc_dapm_widget wm8741_dapm_widgets[] = {
	SND_SOC_DAPM_DAC("DACL", "Playback", SND_SOC_NOPM, 0, 0),
	SND_SOC_DAPM_DAC("DACR", "Playback", SND_SOC_NOPM, 0, 0),
	SND_SOC_DAPM_OUTPUT("VOUTLP"),
	SND_SOC_DAPM_OUTPUT("VOUTLN"),
	SND_SOC_DAPM_OUTPUT("VOUTRP"),
	SND_SOC_DAPM_OUTPUT("VOUTRN"),
	};

	static const struct snd_soc_dapm_route intercon[] = {
	{ "VOUTLP", NULL, "DACL" },
	{ "VOUTLN", NULL, "DACL" },
	{ "VOUTRP", NULL, "DACR" },
	{ "VOUTRN", NULL, "DACR" },
	};

	static int wm8741_add_widgets(struct snd_soc_codec *codec)
	{
	snd_soc_dapm_new_controls(codec, wm8741_dapm_widgets,
	ARRAY_SIZE(wm8741_dapm_widgets));

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

	return 0;
	}

	static struct {
	int value;
	int ratio;
	} lrclk_ratios[WM8741_NUM_RATES] = {
	{ 1, 256 },
	{ 2, 384 },
	{ 3, 512 },
	{ 4, 768 },
	};


	static int wm8741_startup(struct snd_pcm_substream *substream,
	struct snd_soc_dai *dai)
	{
	struct snd_soc_codec *codec = dai->codec;
	struct wm8741_priv *wm8741 = snd_soc_codec_get_drvdata(codec);

	/* The set of sample rates that can be supported depends on the
	* MCLK supplied to the CODEC - enforce this.
	*/
	if (!wm8741->sysclk) {
	dev_err(codec->dev,
	"No MCLK configured, call set_sysclk() on init\n");
	return -EINVAL;
	}

	snd_pcm_hw_constraint_list(substream->runtime, 0,
	SNDRV_PCM_HW_PARAM_RATE,
	&wm8741->rate_constraint);

	return 0;
	}

	static int wm8741_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;
	struct wm8741_priv *wm8741 = snd_soc_codec_get_drvdata(codec);
	u16 iface = snd_soc_read(codec, WM8741_FORMAT_CONTROL) & 0x1FC;
	int i;

	/* Find a supported LRCLK ratio */
	for (i = 0; i < ARRAY_SIZE(lrclk_ratios); i++) {
	if (wm8741->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",
	wm8741->sysclk / params_rate(params));
	return -EINVAL;
	}

	/* bit size */
	switch (params_format(params)) {
	case SNDRV_PCM_FORMAT_S16_LE:
	break;
	case SNDRV_PCM_FORMAT_S20_3LE:
	iface \|= 0x0001;
	break;
	case SNDRV_PCM_FORMAT_S24_LE:
	iface \|= 0x0002;
	break;
	case SNDRV_PCM_FORMAT_S32_LE:
	iface \|= 0x0003;
	break;
	default:
	dev_dbg(codec->dev, "wm8741_hw_params: Unsupported bit size param = %d",
	params_format(params));
	return -EINVAL;
	}

	dev_dbg(codec->dev, "wm8741_hw_params: bit size param = %d",
	params_format(params));

	snd_soc_write(codec, WM8741_FORMAT_CONTROL, iface);
	return 0;
	}

	static int wm8741_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 wm8741_priv *wm8741 = snd_soc_codec_get_drvdata(codec);
	unsigned int val;
	int i;

	dev_dbg(codec->dev, "wm8741_set_dai_sysclk info: freq=%dHz\n", freq);

	wm8741->sysclk = freq;

	wm8741->rate_constraint.count = 0;

	for (i = 0; i < ARRAY_SIZE(lrclk_ratios); i++) {
	dev_dbg(codec->dev, "index = %d, ratio = %d, freq = %d",
	i, lrclk_ratios[i].ratio, freq);

	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 32000:
	case 44100:
	case 48000:
	case 64000:
	case 88200:
	case 96000:
	dev_dbg(codec->dev, "Supported sample rate: %dHz\n",
	val);
	wm8741->rate_constraint_list[i] = val;
	wm8741->rate_constraint.count++;
	break;
	default:
	dev_dbg(codec->dev, "Skipping sample rate: %dHz\n",
	val);
	}
	}

	/* Need at least one supported rate... */
	if (wm8741->rate_constraint.count == 0)
	return -EINVAL;

	return 0;
	}

	static int wm8741_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, WM8741_FORMAT_CONTROL) & 0x1C3;

	/* check master/slave audio interface */
	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
	case SND_SOC_DAIFMT_CBS_CFS:
	break;
	default:
	return -EINVAL;
	}

	/* interface format */
	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
	case SND_SOC_DAIFMT_I2S:
	iface \|= 0x0008;
	break;
	case SND_SOC_DAIFMT_RIGHT_J:
	break;
	case SND_SOC_DAIFMT_LEFT_J:
	iface \|= 0x0004;
	break;
	case SND_SOC_DAIFMT_DSP_A:
	iface \|= 0x0003;
	break;
	case SND_SOC_DAIFMT_DSP_B:
	iface \|= 0x0013;
	break;
	default:
	return -EINVAL;
	}

	/* clock inversion */
	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
	case SND_SOC_DAIFMT_NB_NF:
	break;
	case SND_SOC_DAIFMT_IB_IF:
	iface \|= 0x0010;
	break;
	case SND_SOC_DAIFMT_IB_NF:
	iface \|= 0x0020;
	break;
	case SND_SOC_DAIFMT_NB_IF:
	iface \|= 0x0030;
	break;
	default:
	return -EINVAL;
	}


	dev_dbg(codec->dev, "wm8741_set_dai_fmt: Format=%x, Clock Inv=%x\n",
	fmt & SND_SOC_DAIFMT_FORMAT_MASK,
	((fmt & SND_SOC_DAIFMT_INV_MASK)));

	snd_soc_write(codec, WM8741_FORMAT_CONTROL, iface);
	return 0;
	}

	#define WM8741_RATES (SNDRV_PCM_RATE_32000 \| SNDRV_PCM_RATE_44100 \| \
	SNDRV_PCM_RATE_48000 \| SNDRV_PCM_RATE_88200 \| \
	SNDRV_PCM_RATE_96000 \| SNDRV_PCM_RATE_176400 \| \
	SNDRV_PCM_RATE_192000)

	#define WM8741_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 wm8741_dai_ops = {
	.startup = wm8741_startup,
	.hw_params = wm8741_hw_params,
	.set_sysclk = wm8741_set_dai_sysclk,
	.set_fmt = wm8741_set_dai_fmt,
	};

	static struct snd_soc_dai_driver wm8741_dai = {
	.name = "WM8741",
	.playback = {
	.stream_name = "Playback",
	.channels_min = 2, /* Mono modes not yet supported */
	.channels_max = 2,
	.rates = WM8741_RATES,
	.formats = WM8741_FORMATS,
	},
	.ops = &wm8741_dai_ops,
	};

	#ifdef CONFIG_PM
	static int wm8741_resume(struct snd_soc_codec *codec)
	{
	u16 *cache = codec->reg_cache;
	int i;

	/* RESTORE REG Cache */
	for (i = 0; i < WM8741_REGISTER_COUNT; i++) {
	if (cache[i] == wm8741_reg_defaults[i] \|\| WM8741_RESET == i)
	continue;
	snd_soc_write(codec, i, cache[i]);
	}
	return 0;
	}
	#else
	#define wm8741_suspend NULL
	#define wm8741_resume NULL
	#endif

	static int wm8741_probe(struct snd_soc_codec *codec)
	{
	struct wm8741_priv *wm8741 = snd_soc_codec_get_drvdata(codec);
	int ret = 0;

	ret = snd_soc_codec_set_cache_io(codec, 7, 9, wm8741->control_type);
	if (ret != 0) {
	dev_err(codec->dev, "Failed to set cache I/O: %d\n", ret);
	return ret;
	}

	ret = wm8741_reset(codec);
	if (ret < 0) {
	dev_err(codec->dev, "Failed to issue reset\n");
	return ret;
	}

	/* Change some default settings - latch VU */
	wm8741->reg_cache[WM8741_DACLLSB_ATTENUATION] \|= WM8741_UPDATELL;
	wm8741->reg_cache[WM8741_DACLMSB_ATTENUATION] \|= WM8741_UPDATELM;
	wm8741->reg_cache[WM8741_DACRLSB_ATTENUATION] \|= WM8741_UPDATERL;
	wm8741->reg_cache[WM8741_DACRLSB_ATTENUATION] \|= WM8741_UPDATERM;

	snd_soc_add_controls(codec, wm8741_snd_controls,
	ARRAY_SIZE(wm8741_snd_controls));
	wm8741_add_widgets(codec);

	dev_dbg(codec->dev, "Successful registration\n");
	return ret;
	}

	static struct snd_soc_codec_driver soc_codec_dev_wm8741 = {
	.probe = wm8741_probe,
	.resume = wm8741_resume,
	.reg_cache_size = sizeof(wm8741_reg_defaults),
	.reg_word_size = sizeof(u16),
	.reg_cache_default = &wm8741_reg_defaults,
	};

	#if defined(CONFIG_I2C) \|\| defined(CONFIG_I2C_MODULE)
	static int wm8741_i2c_probe(struct i2c_client *i2c,
	const struct i2c_device_id *id)
	{
	struct wm8741_priv *wm8741;
	int ret, i;

	wm8741 = kzalloc(sizeof(struct wm8741_priv), GFP_KERNEL);
	if (wm8741 == NULL)
	return -ENOMEM;

	wm8741->rate_constraint.list = &wm8741->rate_constraint_list[0];
	wm8741->rate_constraint.count =
	ARRAY_SIZE(wm8741->rate_constraint_list);

	for (i = 0; i < ARRAY_SIZE(wm8741->supplies); i++)
	wm8741->supplies[i].supply = wm8741_supply_names[i];

	ret = regulator_bulk_get(&i2c->dev, ARRAY_SIZE(wm8741->supplies),
	wm8741->supplies);
	if (ret != 0) {
	dev_err(&i2c->dev, "Failed to request supplies: %d\n", ret);
	goto err;
	}

	ret = regulator_bulk_enable(ARRAY_SIZE(wm8741->supplies),
	wm8741->supplies);
	if (ret != 0) {
	dev_err(&i2c->dev, "Failed to enable supplies: %d\n", ret);
	goto err_get;
	}

	i2c_set_clientdata(i2c, wm8741);
	wm8741->control_type = SND_SOC_I2C;

	ret = snd_soc_register_codec(&i2c->dev,
	&soc_codec_dev_wm8741, &wm8741_dai, 1);
	if (ret < 0)
	goto err_enable;
	return ret;

	err_enable:
	regulator_bulk_disable(ARRAY_SIZE(wm8741->supplies), wm8741->supplies);

	err_get:
	regulator_bulk_free(ARRAY_SIZE(wm8741->supplies), wm8741->supplies);
	err:
	kfree(wm8741);
	return ret;
	}

	static int wm8741_i2c_remove(struct i2c_client *client)
	{
	struct wm8741_priv *wm8741 = i2c_get_clientdata(client);

	snd_soc_unregister_codec(&client->dev);
	regulator_bulk_free(ARRAY_SIZE(wm8741->supplies), wm8741->supplies);
	kfree(i2c_get_clientdata(client));
	return 0;
	}

	static const struct i2c_device_id wm8741_i2c_id[] = {
	{ "wm8741", 0 },
	{ }
	};
	MODULE_DEVICE_TABLE(i2c, wm8741_i2c_id);

	static struct i2c_driver wm8741_i2c_driver = {
	.driver = {
	.name = "wm8741-codec",
	.owner = THIS_MODULE,
	},
	.probe = wm8741_i2c_probe,
	.remove = wm8741_i2c_remove,
	.id_table = wm8741_i2c_id,
	};
	#endif

	static int __init wm8741_modinit(void)
	{
	int ret = 0;

	#if defined(CONFIG_I2C) \|\| defined(CONFIG_I2C_MODULE)
	ret = i2c_add_driver(&wm8741_i2c_driver);
	if (ret != 0) {
	pr_err("Failed to register WM8741 I2C driver: %d\n", ret);
	}
	#endif

	return ret;
	}
	module_init(wm8741_modinit);

	static void __exit wm8741_exit(void)
	{
	#if defined(CONFIG_I2C) \|\| defined(CONFIG_I2C_MODULE)
	i2c_del_driver(&wm8741_i2c_driver);
	#endif
	}
	module_exit(wm8741_exit);

	MODULE_DESCRIPTION("ASoC WM8741 driver");
	MODULE_AUTHOR("Ian Lartey <ian@opensource.wolfsonmicro.com>");
	MODULE_LICENSE("GPL");