sound/soc/codecs/wm8711.c - fp2-dev/kernel/msm - Gitiles

 /*
  * wm8711.c  --  WM8711 ALSA SoC Audio driver
  *
  * Copyright 2006 Wolfson Microelectronics
  *
  * Author: Mike Arthur <linux@wolfsonmicro.com>
  *
  * Based on wm8731.c by Richard Purdie
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  */

 #include <linux/module.h>
 #include <linux/moduleparam.h>
 #include <linux/init.h>
 #include <linux/delay.h>
 #include <linux/pm.h>
 #include <linux/i2c.h>
 #include <linux/platform_device.h>
 #include <linux/spi/spi.h>
 #include <linux/slab.h>
 #include <sound/core.h>
 #include <sound/pcm.h>
 #include <sound/pcm_params.h>
 #include <sound/soc.h>
 #include <sound/tlv.h>
 #include <sound/initval.h>

 #include "wm8711.h"

 /* codec private data */
 struct wm8711_priv {
 	enum snd_soc_control_type bus_type;
 	unsigned int sysclk;
 };

 /*
  * wm8711 register cache
  * We can't read the WM8711 register space when we are
  * using 2 wire for device control, so we cache them instead.
  * There is no point in caching the reset register
  */
 static const u16 wm8711_reg[WM8711_CACHEREGNUM] = {
 	0x0079, 0x0079, 0x000a, 0x0008,
 	0x009f, 0x000a, 0x0000, 0x0000
 };

 #define wm8711_reset(c)	snd_soc_write(c, WM8711_RESET, 0)

 static const DECLARE_TLV_DB_SCALE(out_tlv, -12100, 100, 1);

 static const struct snd_kcontrol_new wm8711_snd_controls[] = {

 SOC_DOUBLE_R_TLV("Master Playback Volume", WM8711_LOUT1V, WM8711_ROUT1V,
 		 0, 127, 0, out_tlv),
 SOC_DOUBLE_R("Master Playback ZC Switch", WM8711_LOUT1V, WM8711_ROUT1V,
 	7, 1, 0),

 };

 /* Output Mixer */
 static const struct snd_kcontrol_new wm8711_output_mixer_controls[] = {
 SOC_DAPM_SINGLE("Line Bypass Switch", WM8711_APANA, 3, 1, 0),
 SOC_DAPM_SINGLE("HiFi Playback Switch", WM8711_APANA, 4, 1, 0),
 };

 static const struct snd_soc_dapm_widget wm8711_dapm_widgets[] = {
 SND_SOC_DAPM_MIXER("Output Mixer", WM8711_PWR, 4, 1,
 	&wm8711_output_mixer_controls[0],
 	ARRAY_SIZE(wm8711_output_mixer_controls)),
 SND_SOC_DAPM_DAC("DAC", "HiFi Playback", WM8711_PWR, 3, 1),
 SND_SOC_DAPM_OUTPUT("LOUT"),
 SND_SOC_DAPM_OUTPUT("LHPOUT"),
 SND_SOC_DAPM_OUTPUT("ROUT"),
 SND_SOC_DAPM_OUTPUT("RHPOUT"),
 };

 static const struct snd_soc_dapm_route wm8711_intercon[] = {
 	/* output mixer */
 	{"Output Mixer", "Line Bypass Switch", "Line Input"},
 	{"Output Mixer", "HiFi Playback Switch", "DAC"},

 	/* outputs */
 	{"RHPOUT", NULL, "Output Mixer"},
 	{"ROUT", NULL, "Output Mixer"},
 	{"LHPOUT", NULL, "Output Mixer"},
 	{"LOUT", NULL, "Output Mixer"},
 };

 struct _coeff_div {
 	u32 mclk;
 	u32 rate;
 	u16 fs;
 	u8 sr:4;
 	u8 bosr:1;
 	u8 usb:1;
 };

 /* codec mclk clock divider coefficients */
 static const struct _coeff_div coeff_div[] = {
 	/* 48k */
 	{12288000, 48000, 256, 0x0, 0x0, 0x0},
 	{18432000, 48000, 384, 0x0, 0x1, 0x0},
 	{12000000, 48000, 250, 0x0, 0x0, 0x1},

 	/* 32k */
 	{12288000, 32000, 384, 0x6, 0x0, 0x0},
 	{18432000, 32000, 576, 0x6, 0x1, 0x0},
 	{12000000, 32000, 375, 0x6, 0x0, 0x1},

 	/* 8k */
 	{12288000, 8000, 1536, 0x3, 0x0, 0x0},
 	{18432000, 8000, 2304, 0x3, 0x1, 0x0},
 	{11289600, 8000, 1408, 0xb, 0x0, 0x0},
 	{16934400, 8000, 2112, 0xb, 0x1, 0x0},
 	{12000000, 8000, 1500, 0x3, 0x0, 0x1},

 	/* 96k */
 	{12288000, 96000, 128, 0x7, 0x0, 0x0},
 	{18432000, 96000, 192, 0x7, 0x1, 0x0},
 	{12000000, 96000, 125, 0x7, 0x0, 0x1},

 	/* 44.1k */
 	{11289600, 44100, 256, 0x8, 0x0, 0x0},
 	{16934400, 44100, 384, 0x8, 0x1, 0x0},
 	{12000000, 44100, 272, 0x8, 0x1, 0x1},

 	/* 88.2k */
 	{11289600, 88200, 128, 0xf, 0x0, 0x0},
 	{16934400, 88200, 192, 0xf, 0x1, 0x0},
 	{12000000, 88200, 136, 0xf, 0x1, 0x1},
 };

 static inline int get_coeff(int mclk, int rate)
 {
 	int i;

 	for (i = 0; i < ARRAY_SIZE(coeff_div); i++) {
 		if (coeff_div[i].rate == rate && coeff_div[i].mclk == mclk)
 			return i;
 	}
 	return 0;
 }

 static int wm8711_hw_params(struct snd_pcm_substream *substream,
 	struct snd_pcm_hw_params *params,
 	struct snd_soc_dai *dai)
 {
 	struct snd_soc_codec *codec = dai->codec;
 	struct wm8711_priv *wm8711 =  snd_soc_codec_get_drvdata(codec);
 	u16 iface = snd_soc_read(codec, WM8711_IFACE) & 0xfffc;
 	int i = get_coeff(wm8711->sysclk, params_rate(params));
 	u16 srate = (coeff_div[i].sr << 2) |
 		(coeff_div[i].bosr << 1) | coeff_div[i].usb;

 	snd_soc_write(codec, WM8711_SRATE, srate);

 	/* bit size */
 	switch (params_format(params)) {
 	case SNDRV_PCM_FORMAT_S16_LE:
 		break;
 	case SNDRV_PCM_FORMAT_S20_3LE:
 		iface |= 0x0004;
 		break;
 	case SNDRV_PCM_FORMAT_S24_LE:
 		iface |= 0x0008;
 		break;
 	}

 	snd_soc_write(codec, WM8711_IFACE, iface);
 	return 0;
 }

 static int wm8711_pcm_prepare(struct snd_pcm_substream *substream,
 			      struct snd_soc_dai *dai)
 {
 	struct snd_soc_codec *codec = dai->codec;

 	/* set active */
 	snd_soc_write(codec, WM8711_ACTIVE, 0x0001);

 	return 0;
 }

 static void wm8711_shutdown(struct snd_pcm_substream *substream,
 			    struct snd_soc_dai *dai)
 {
 	struct snd_soc_codec *codec = dai->codec;

 	/* deactivate */
 	if (!codec->active) {
 		udelay(50);
 		snd_soc_write(codec, WM8711_ACTIVE, 0x0);
 	}
 }

 static int wm8711_mute(struct snd_soc_dai *dai, int mute)
 {
 	struct snd_soc_codec *codec = dai->codec;
 	u16 mute_reg = snd_soc_read(codec, WM8711_APDIGI) & 0xfff7;

 	if (mute)
 		snd_soc_write(codec, WM8711_APDIGI, mute_reg | 0x8);
 	else
 		snd_soc_write(codec, WM8711_APDIGI, mute_reg);

 	return 0;
 }

 static int wm8711_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 wm8711_priv *wm8711 =  snd_soc_codec_get_drvdata(codec);

 	switch (freq) {
 	case 11289600:
 	case 12000000:
 	case 12288000:
 	case 16934400:
 	case 18432000:
 		wm8711->sysclk = freq;
 		return 0;
 	}
 	return -EINVAL;
 }

 static int wm8711_set_dai_fmt(struct snd_soc_dai *codec_dai,
 		unsigned int fmt)
 {
 	struct snd_soc_codec *codec = codec_dai->codec;
 	u16 iface = 0;

 	/* set master/slave audio interface */
 	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 	case SND_SOC_DAIFMT_CBM_CFM:
 		iface |= 0x0040;
 		break;
 	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 |= 0x0002;
 		break;
 	case SND_SOC_DAIFMT_RIGHT_J:
 		break;
 	case SND_SOC_DAIFMT_LEFT_J:
 		iface |= 0x0001;
 		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 |= 0x0090;
 		break;
 	case SND_SOC_DAIFMT_IB_NF:
 		iface |= 0x0080;
 		break;
 	case SND_SOC_DAIFMT_NB_IF:
 		iface |= 0x0010;
 		break;
 	default:
 		return -EINVAL;
 	}

 	/* set iface */
 	snd_soc_write(codec, WM8711_IFACE, iface);
 	return 0;
 }


 static int wm8711_set_bias_level(struct snd_soc_codec *codec,
 	enum snd_soc_bias_level level)
 {
 	u16 reg = snd_soc_read(codec, WM8711_PWR) & 0xff7f;

 	switch (level) {
 	case SND_SOC_BIAS_ON:
 		snd_soc_write(codec, WM8711_PWR, reg);
 		break;
 	case SND_SOC_BIAS_PREPARE:
 		break;
 	case SND_SOC_BIAS_STANDBY:
 		snd_soc_write(codec, WM8711_PWR, reg | 0x0040);
 		break;
 	case SND_SOC_BIAS_OFF:
 		snd_soc_write(codec, WM8711_ACTIVE, 0x0);
 		snd_soc_write(codec, WM8711_PWR, 0xffff);
 		break;
 	}
 	codec->dapm.bias_level = level;
 	return 0;
 }

 #define WM8711_RATES SNDRV_PCM_RATE_8000_96000

 #define WM8711_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
 	SNDRV_PCM_FMTBIT_S24_LE)

 static struct snd_soc_dai_ops wm8711_ops = {
 	.prepare = wm8711_pcm_prepare,
 	.hw_params = wm8711_hw_params,
 	.shutdown = wm8711_shutdown,
 	.digital_mute = wm8711_mute,
 	.set_sysclk = wm8711_set_dai_sysclk,
 	.set_fmt = wm8711_set_dai_fmt,
 };

 static struct snd_soc_dai_driver wm8711_dai = {
 	.name = "wm8711-hifi",
 	.playback = {
 		.stream_name = "Playback",
 		.channels_min = 1,
 		.channels_max = 2,
 		.rates = WM8711_RATES,
 		.formats = WM8711_FORMATS,
 	},
 	.ops = &wm8711_ops,
 };

 static int wm8711_suspend(struct snd_soc_codec *codec, pm_message_t state)
 {
 	snd_soc_write(codec, WM8711_ACTIVE, 0x0);
 	wm8711_set_bias_level(codec, SND_SOC_BIAS_OFF);
 	return 0;
 }

 static int wm8711_resume(struct snd_soc_codec *codec)
 {
 	int i;
 	u8 data[2];
 	u16 *cache = codec->reg_cache;

 	/* Sync reg_cache with the hardware */
 	for (i = 0; i < ARRAY_SIZE(wm8711_reg); i++) {
 		data[0] = (i << 1) | ((cache[i] >> 8) & 0x0001);
 		data[1] = cache[i] & 0x00ff;
 		codec->hw_write(codec->control_data, data, 2);
 	}
 	wm8711_set_bias_level(codec, SND_SOC_BIAS_STANDBY);

 	return 0;
 }

 static int wm8711_probe(struct snd_soc_codec *codec)
 {
 	struct wm8711_priv *wm8711 = snd_soc_codec_get_drvdata(codec);
 	int ret, reg;

 	ret = snd_soc_codec_set_cache_io(codec, 7, 9, wm8711->bus_type);
 	if (ret < 0) {
 		dev_err(codec->dev, "Failed to set cache I/O: %d\n", ret);
 		return ret;
 	}

 	ret = wm8711_reset(codec);
 	if (ret < 0) {
 		dev_err(codec->dev, "Failed to issue reset\n");
 		return ret;
 	}

 	wm8711_set_bias_level(codec, SND_SOC_BIAS_STANDBY);

 	/* Latch the update bits */
 	reg = snd_soc_read(codec, WM8711_LOUT1V);
 	snd_soc_write(codec, WM8711_LOUT1V, reg | 0x0100);
 	reg = snd_soc_read(codec, WM8711_ROUT1V);
 	snd_soc_write(codec, WM8711_ROUT1V, reg | 0x0100);

 	snd_soc_add_controls(codec, wm8711_snd_controls,
 			     ARRAY_SIZE(wm8711_snd_controls));

 	return ret;

 }

 /* power down chip */
 static int wm8711_remove(struct snd_soc_codec *codec)
 {
 	wm8711_set_bias_level(codec, SND_SOC_BIAS_OFF);
 	return 0;
 }

 static struct snd_soc_codec_driver soc_codec_dev_wm8711 = {
 	.probe =	wm8711_probe,
 	.remove =	wm8711_remove,
 	.suspend =	wm8711_suspend,
 	.resume =	wm8711_resume,
 	.set_bias_level = wm8711_set_bias_level,
 	.reg_cache_size = ARRAY_SIZE(wm8711_reg),
 	.reg_word_size = sizeof(u16),
 	.reg_cache_default = wm8711_reg,
 	.dapm_widgets = wm8711_dapm_widgets,
 	.num_dapm_widgets = ARRAY_SIZE(wm8711_dapm_widgets),
 	.dapm_routes = wm8711_intercon,
 	.num_dapm_routes = ARRAY_SIZE(wm8711_intercon),
 };

 #if defined(CONFIG_SPI_MASTER)
 static int __devinit wm8711_spi_probe(struct spi_device *spi)
 {
 	struct wm8711_priv *wm8711;
 	int ret;

 	wm8711 = kzalloc(sizeof(struct wm8711_priv), GFP_KERNEL);
 	if (wm8711 == NULL)
 		return -ENOMEM;

 	spi_set_drvdata(spi, wm8711);
 	wm8711->bus_type = SND_SOC_SPI;

 	ret = snd_soc_register_codec(&spi->dev,
 			&soc_codec_dev_wm8711, &wm8711_dai, 1);
 	if (ret < 0)
 		kfree(wm8711);
 	return ret;
 }

 static int __devexit wm8711_spi_remove(struct spi_device *spi)
 {
 	snd_soc_unregister_codec(&spi->dev);
 	kfree(spi_get_drvdata(spi));
 	return 0;
 }

 static struct spi_driver wm8711_spi_driver = {
 	.driver = {
 		.name	= "wm8711-codec",
 		.owner	= THIS_MODULE,
 	},
 	.probe		= wm8711_spi_probe,
 	.remove		= __devexit_p(wm8711_spi_remove),
 };
 #endif /* CONFIG_SPI_MASTER */

 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 static __devinit int wm8711_i2c_probe(struct i2c_client *client,
 				      const struct i2c_device_id *id)
 {
 	struct wm8711_priv *wm8711;
 	int ret;

 	wm8711 = kzalloc(sizeof(struct wm8711_priv), GFP_KERNEL);
 	if (wm8711 == NULL)
 		return -ENOMEM;

 	i2c_set_clientdata(client, wm8711);
 	wm8711->bus_type = SND_SOC_I2C;

 	ret =  snd_soc_register_codec(&client->dev,
 			&soc_codec_dev_wm8711, &wm8711_dai, 1);
 	if (ret < 0)
 		kfree(wm8711);
 	return ret;
 }

 static __devexit int wm8711_i2c_remove(struct i2c_client *client)
 {
 	snd_soc_unregister_codec(&client->dev);
 	kfree(i2c_get_clientdata(client));
 	return 0;
 }

 static const struct i2c_device_id wm8711_i2c_id[] = {
 	{ "wm8711", 0 },
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, wm8711_i2c_id);

 static struct i2c_driver wm8711_i2c_driver = {
 	.driver = {
 		.name = "wm8711-codec",
 		.owner = THIS_MODULE,
 	},
 	.probe =    wm8711_i2c_probe,
 	.remove =   __devexit_p(wm8711_i2c_remove),
 	.id_table = wm8711_i2c_id,
 };
 #endif

 static int __init wm8711_modinit(void)
 {
 	int ret;
 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 	ret = i2c_add_driver(&wm8711_i2c_driver);
 	if (ret != 0) {
 		printk(KERN_ERR "Failed to register WM8711 I2C driver: %d\n",
 		       ret);
 	}
 #endif
 #if defined(CONFIG_SPI_MASTER)
 	ret = spi_register_driver(&wm8711_spi_driver);
 	if (ret != 0) {
 		printk(KERN_ERR "Failed to register WM8711 SPI driver: %d\n",
 		       ret);
 	}
 #endif
 	return 0;
 }
 module_init(wm8711_modinit);

 static void __exit wm8711_exit(void)
 {
 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 	i2c_del_driver(&wm8711_i2c_driver);
 #endif
 #if defined(CONFIG_SPI_MASTER)
 	spi_unregister_driver(&wm8711_spi_driver);
 #endif
 }
 module_exit(wm8711_exit);

 MODULE_DESCRIPTION("ASoC WM8711 driver");
 MODULE_AUTHOR("Mike Arthur");
 MODULE_LICENSE("GPL");
	/*
	* wm8711.c -- WM8711 ALSA SoC Audio driver
	*
	* Copyright 2006 Wolfson Microelectronics
	*
	* Author: Mike Arthur <linux@wolfsonmicro.com>
	*
	* Based on wm8731.c by Richard Purdie
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 as
	* published by the Free Software Foundation.
	*/

	#include <linux/module.h>
	#include <linux/moduleparam.h>
	#include <linux/init.h>
	#include <linux/delay.h>
	#include <linux/pm.h>
	#include <linux/i2c.h>
	#include <linux/platform_device.h>
	#include <linux/spi/spi.h>
	#include <linux/slab.h>
	#include <sound/core.h>
	#include <sound/pcm.h>
	#include <sound/pcm_params.h>
	#include <sound/soc.h>
	#include <sound/tlv.h>
	#include <sound/initval.h>

	#include "wm8711.h"

	/* codec private data */
	struct wm8711_priv {
	enum snd_soc_control_type bus_type;
	unsigned int sysclk;
	};

	/*
	* wm8711 register cache
	* We can't read the WM8711 register space when we are
	* using 2 wire for device control, so we cache them instead.
	* There is no point in caching the reset register
	*/
	static const u16 wm8711_reg[WM8711_CACHEREGNUM] = {
	0x0079, 0x0079, 0x000a, 0x0008,
	0x009f, 0x000a, 0x0000, 0x0000
	};

	#define wm8711_reset(c) snd_soc_write(c, WM8711_RESET, 0)

	static const DECLARE_TLV_DB_SCALE(out_tlv, -12100, 100, 1);

	static const struct snd_kcontrol_new wm8711_snd_controls[] = {

	SOC_DOUBLE_R_TLV("Master Playback Volume", WM8711_LOUT1V, WM8711_ROUT1V,
	0, 127, 0, out_tlv),
	SOC_DOUBLE_R("Master Playback ZC Switch", WM8711_LOUT1V, WM8711_ROUT1V,
	7, 1, 0),

	};

	/* Output Mixer */
	static const struct snd_kcontrol_new wm8711_output_mixer_controls[] = {
	SOC_DAPM_SINGLE("Line Bypass Switch", WM8711_APANA, 3, 1, 0),
	SOC_DAPM_SINGLE("HiFi Playback Switch", WM8711_APANA, 4, 1, 0),
	};

	static const struct snd_soc_dapm_widget wm8711_dapm_widgets[] = {
	SND_SOC_DAPM_MIXER("Output Mixer", WM8711_PWR, 4, 1,
	&wm8711_output_mixer_controls[0],
	ARRAY_SIZE(wm8711_output_mixer_controls)),
	SND_SOC_DAPM_DAC("DAC", "HiFi Playback", WM8711_PWR, 3, 1),
	SND_SOC_DAPM_OUTPUT("LOUT"),
	SND_SOC_DAPM_OUTPUT("LHPOUT"),
	SND_SOC_DAPM_OUTPUT("ROUT"),
	SND_SOC_DAPM_OUTPUT("RHPOUT"),
	};

	static const struct snd_soc_dapm_route wm8711_intercon[] = {
	/* output mixer */
	{"Output Mixer", "Line Bypass Switch", "Line Input"},
	{"Output Mixer", "HiFi Playback Switch", "DAC"},

	/* outputs */
	{"RHPOUT", NULL, "Output Mixer"},
	{"ROUT", NULL, "Output Mixer"},
	{"LHPOUT", NULL, "Output Mixer"},
	{"LOUT", NULL, "Output Mixer"},
	};

	struct _coeff_div {
	u32 mclk;
	u32 rate;
	u16 fs;
	u8 sr:4;
	u8 bosr:1;
	u8 usb:1;
	};

	/* codec mclk clock divider coefficients */
	static const struct _coeff_div coeff_div[] = {
	/* 48k */
	{12288000, 48000, 256, 0x0, 0x0, 0x0},
	{18432000, 48000, 384, 0x0, 0x1, 0x0},
	{12000000, 48000, 250, 0x0, 0x0, 0x1},

	/* 32k */
	{12288000, 32000, 384, 0x6, 0x0, 0x0},
	{18432000, 32000, 576, 0x6, 0x1, 0x0},
	{12000000, 32000, 375, 0x6, 0x0, 0x1},

	/* 8k */
	{12288000, 8000, 1536, 0x3, 0x0, 0x0},
	{18432000, 8000, 2304, 0x3, 0x1, 0x0},
	{11289600, 8000, 1408, 0xb, 0x0, 0x0},
	{16934400, 8000, 2112, 0xb, 0x1, 0x0},
	{12000000, 8000, 1500, 0x3, 0x0, 0x1},

	/* 96k */
	{12288000, 96000, 128, 0x7, 0x0, 0x0},
	{18432000, 96000, 192, 0x7, 0x1, 0x0},
	{12000000, 96000, 125, 0x7, 0x0, 0x1},

	/* 44.1k */
	{11289600, 44100, 256, 0x8, 0x0, 0x0},
	{16934400, 44100, 384, 0x8, 0x1, 0x0},
	{12000000, 44100, 272, 0x8, 0x1, 0x1},

	/* 88.2k */
	{11289600, 88200, 128, 0xf, 0x0, 0x0},
	{16934400, 88200, 192, 0xf, 0x1, 0x0},
	{12000000, 88200, 136, 0xf, 0x1, 0x1},
	};

	static inline int get_coeff(int mclk, int rate)
	{
	int i;

	for (i = 0; i < ARRAY_SIZE(coeff_div); i++) {
	if (coeff_div[i].rate == rate && coeff_div[i].mclk == mclk)
	return i;
	}
	return 0;
	}

	static int wm8711_hw_params(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *params,
	struct snd_soc_dai *dai)
	{
	struct snd_soc_codec *codec = dai->codec;
	struct wm8711_priv *wm8711 = snd_soc_codec_get_drvdata(codec);
	u16 iface = snd_soc_read(codec, WM8711_IFACE) & 0xfffc;
	int i = get_coeff(wm8711->sysclk, params_rate(params));
	u16 srate = (coeff_div[i].sr << 2) \|
	(coeff_div[i].bosr << 1) \| coeff_div[i].usb;

	snd_soc_write(codec, WM8711_SRATE, srate);

	/* bit size */
	switch (params_format(params)) {
	case SNDRV_PCM_FORMAT_S16_LE:
	break;
	case SNDRV_PCM_FORMAT_S20_3LE:
	iface \|= 0x0004;
	break;
	case SNDRV_PCM_FORMAT_S24_LE:
	iface \|= 0x0008;
	break;
	}

	snd_soc_write(codec, WM8711_IFACE, iface);
	return 0;
	}

	static int wm8711_pcm_prepare(struct snd_pcm_substream *substream,
	struct snd_soc_dai *dai)
	{
	struct snd_soc_codec *codec = dai->codec;

	/* set active */
	snd_soc_write(codec, WM8711_ACTIVE, 0x0001);

	return 0;
	}

	static void wm8711_shutdown(struct snd_pcm_substream *substream,
	struct snd_soc_dai *dai)
	{
	struct snd_soc_codec *codec = dai->codec;

	/* deactivate */
	if (!codec->active) {
	udelay(50);
	snd_soc_write(codec, WM8711_ACTIVE, 0x0);
	}
	}

	static int wm8711_mute(struct snd_soc_dai *dai, int mute)
	{
	struct snd_soc_codec *codec = dai->codec;
	u16 mute_reg = snd_soc_read(codec, WM8711_APDIGI) & 0xfff7;

	if (mute)
	snd_soc_write(codec, WM8711_APDIGI, mute_reg \| 0x8);
	else
	snd_soc_write(codec, WM8711_APDIGI, mute_reg);

	return 0;
	}

	static int wm8711_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 wm8711_priv *wm8711 = snd_soc_codec_get_drvdata(codec);

	switch (freq) {
	case 11289600:
	case 12000000:
	case 12288000:
	case 16934400:
	case 18432000:
	wm8711->sysclk = freq;
	return 0;
	}
	return -EINVAL;
	}

	static int wm8711_set_dai_fmt(struct snd_soc_dai *codec_dai,
	unsigned int fmt)
	{
	struct snd_soc_codec *codec = codec_dai->codec;
	u16 iface = 0;

	/* set master/slave audio interface */
	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
	case SND_SOC_DAIFMT_CBM_CFM:
	iface \|= 0x0040;
	break;
	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 \|= 0x0002;
	break;
	case SND_SOC_DAIFMT_RIGHT_J:
	break;
	case SND_SOC_DAIFMT_LEFT_J:
	iface \|= 0x0001;
	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 \|= 0x0090;
	break;
	case SND_SOC_DAIFMT_IB_NF:
	iface \|= 0x0080;
	break;
	case SND_SOC_DAIFMT_NB_IF:
	iface \|= 0x0010;
	break;
	default:
	return -EINVAL;
	}

	/* set iface */
	snd_soc_write(codec, WM8711_IFACE, iface);
	return 0;
	}


	static int wm8711_set_bias_level(struct snd_soc_codec *codec,
	enum snd_soc_bias_level level)
	{
	u16 reg = snd_soc_read(codec, WM8711_PWR) & 0xff7f;

	switch (level) {
	case SND_SOC_BIAS_ON:
	snd_soc_write(codec, WM8711_PWR, reg);
	break;
	case SND_SOC_BIAS_PREPARE:
	break;
	case SND_SOC_BIAS_STANDBY:
	snd_soc_write(codec, WM8711_PWR, reg \| 0x0040);
	break;
	case SND_SOC_BIAS_OFF:
	snd_soc_write(codec, WM8711_ACTIVE, 0x0);
	snd_soc_write(codec, WM8711_PWR, 0xffff);
	break;
	}
	codec->dapm.bias_level = level;
	return 0;
	}

	#define WM8711_RATES SNDRV_PCM_RATE_8000_96000

	#define WM8711_FORMATS (SNDRV_PCM_FMTBIT_S16_LE \| SNDRV_PCM_FMTBIT_S20_3LE \|\
	SNDRV_PCM_FMTBIT_S24_LE)

	static struct snd_soc_dai_ops wm8711_ops = {
	.prepare = wm8711_pcm_prepare,
	.hw_params = wm8711_hw_params,
	.shutdown = wm8711_shutdown,
	.digital_mute = wm8711_mute,
	.set_sysclk = wm8711_set_dai_sysclk,
	.set_fmt = wm8711_set_dai_fmt,
	};

	static struct snd_soc_dai_driver wm8711_dai = {
	.name = "wm8711-hifi",
	.playback = {
	.stream_name = "Playback",
	.channels_min = 1,
	.channels_max = 2,
	.rates = WM8711_RATES,
	.formats = WM8711_FORMATS,
	},
	.ops = &wm8711_ops,
	};

	static int wm8711_suspend(struct snd_soc_codec *codec, pm_message_t state)
	{
	snd_soc_write(codec, WM8711_ACTIVE, 0x0);
	wm8711_set_bias_level(codec, SND_SOC_BIAS_OFF);
	return 0;
	}

	static int wm8711_resume(struct snd_soc_codec *codec)
	{
	int i;
	u8 data[2];
	u16 *cache = codec->reg_cache;

	/* Sync reg_cache with the hardware */
	for (i = 0; i < ARRAY_SIZE(wm8711_reg); i++) {
	data[0] = (i << 1) \| ((cache[i] >> 8) & 0x0001);
	data[1] = cache[i] & 0x00ff;
	codec->hw_write(codec->control_data, data, 2);
	}
	wm8711_set_bias_level(codec, SND_SOC_BIAS_STANDBY);

	return 0;
	}

	static int wm8711_probe(struct snd_soc_codec *codec)
	{
	struct wm8711_priv *wm8711 = snd_soc_codec_get_drvdata(codec);
	int ret, reg;

	ret = snd_soc_codec_set_cache_io(codec, 7, 9, wm8711->bus_type);
	if (ret < 0) {
	dev_err(codec->dev, "Failed to set cache I/O: %d\n", ret);
	return ret;
	}

	ret = wm8711_reset(codec);
	if (ret < 0) {
	dev_err(codec->dev, "Failed to issue reset\n");
	return ret;
	}

	wm8711_set_bias_level(codec, SND_SOC_BIAS_STANDBY);

	/* Latch the update bits */
	reg = snd_soc_read(codec, WM8711_LOUT1V);
	snd_soc_write(codec, WM8711_LOUT1V, reg \| 0x0100);
	reg = snd_soc_read(codec, WM8711_ROUT1V);
	snd_soc_write(codec, WM8711_ROUT1V, reg \| 0x0100);

	snd_soc_add_controls(codec, wm8711_snd_controls,
	ARRAY_SIZE(wm8711_snd_controls));

	return ret;

	}

	/* power down chip */
	static int wm8711_remove(struct snd_soc_codec *codec)
	{
	wm8711_set_bias_level(codec, SND_SOC_BIAS_OFF);
	return 0;
	}

	static struct snd_soc_codec_driver soc_codec_dev_wm8711 = {
	.probe = wm8711_probe,
	.remove = wm8711_remove,
	.suspend = wm8711_suspend,
	.resume = wm8711_resume,
	.set_bias_level = wm8711_set_bias_level,
	.reg_cache_size = ARRAY_SIZE(wm8711_reg),
	.reg_word_size = sizeof(u16),
	.reg_cache_default = wm8711_reg,
	.dapm_widgets = wm8711_dapm_widgets,
	.num_dapm_widgets = ARRAY_SIZE(wm8711_dapm_widgets),
	.dapm_routes = wm8711_intercon,
	.num_dapm_routes = ARRAY_SIZE(wm8711_intercon),
	};

	#if defined(CONFIG_SPI_MASTER)
	static int __devinit wm8711_spi_probe(struct spi_device *spi)
	{
	struct wm8711_priv *wm8711;
	int ret;

	wm8711 = kzalloc(sizeof(struct wm8711_priv), GFP_KERNEL);
	if (wm8711 == NULL)
	return -ENOMEM;

	spi_set_drvdata(spi, wm8711);
	wm8711->bus_type = SND_SOC_SPI;

	ret = snd_soc_register_codec(&spi->dev,
	&soc_codec_dev_wm8711, &wm8711_dai, 1);
	if (ret < 0)
	kfree(wm8711);
	return ret;
	}

	static int __devexit wm8711_spi_remove(struct spi_device *spi)
	{
	snd_soc_unregister_codec(&spi->dev);
	kfree(spi_get_drvdata(spi));
	return 0;
	}

	static struct spi_driver wm8711_spi_driver = {
	.driver = {
	.name = "wm8711-codec",
	.owner = THIS_MODULE,
	},
	.probe = wm8711_spi_probe,
	.remove = __devexit_p(wm8711_spi_remove),
	};
	#endif /* CONFIG_SPI_MASTER */

	#if defined(CONFIG_I2C) \|\| defined(CONFIG_I2C_MODULE)
	static __devinit int wm8711_i2c_probe(struct i2c_client *client,
	const struct i2c_device_id *id)
	{
	struct wm8711_priv *wm8711;
	int ret;

	wm8711 = kzalloc(sizeof(struct wm8711_priv), GFP_KERNEL);
	if (wm8711 == NULL)
	return -ENOMEM;

	i2c_set_clientdata(client, wm8711);
	wm8711->bus_type = SND_SOC_I2C;

	ret = snd_soc_register_codec(&client->dev,
	&soc_codec_dev_wm8711, &wm8711_dai, 1);
	if (ret < 0)
	kfree(wm8711);
	return ret;
	}

	static __devexit int wm8711_i2c_remove(struct i2c_client *client)
	{
	snd_soc_unregister_codec(&client->dev);
	kfree(i2c_get_clientdata(client));
	return 0;
	}

	static const struct i2c_device_id wm8711_i2c_id[] = {
	{ "wm8711", 0 },
	{ }
	};
	MODULE_DEVICE_TABLE(i2c, wm8711_i2c_id);

	static struct i2c_driver wm8711_i2c_driver = {
	.driver = {
	.name = "wm8711-codec",
	.owner = THIS_MODULE,
	},
	.probe = wm8711_i2c_probe,
	.remove = __devexit_p(wm8711_i2c_remove),
	.id_table = wm8711_i2c_id,
	};
	#endif

	static int __init wm8711_modinit(void)
	{
	int ret;
	#if defined(CONFIG_I2C) \|\| defined(CONFIG_I2C_MODULE)
	ret = i2c_add_driver(&wm8711_i2c_driver);
	if (ret != 0) {
	printk(KERN_ERR "Failed to register WM8711 I2C driver: %d\n",
	ret);
	}
	#endif
	#if defined(CONFIG_SPI_MASTER)
	ret = spi_register_driver(&wm8711_spi_driver);
	if (ret != 0) {
	printk(KERN_ERR "Failed to register WM8711 SPI driver: %d\n",
	ret);
	}
	#endif
	return 0;
	}
	module_init(wm8711_modinit);

	static void __exit wm8711_exit(void)
	{
	#if defined(CONFIG_I2C) \|\| defined(CONFIG_I2C_MODULE)
	i2c_del_driver(&wm8711_i2c_driver);
	#endif
	#if defined(CONFIG_SPI_MASTER)
	spi_unregister_driver(&wm8711_spi_driver);
	#endif
	}
	module_exit(wm8711_exit);

	MODULE_DESCRIPTION("ASoC WM8711 driver");
	MODULE_AUTHOR("Mike Arthur");
	MODULE_LICENSE("GPL");