ASoC: Add WM8711 CODEC driver

The WM8711 or WM8711L (WM8711/L) is a low power stereo DAC with an
integrated headphone driver. The WM8711/L is designed specifically for
portable MP3 audio and speech players. The WM8711/L is also ideal for
MD, CD machines and DAT players.
Signed-off-by: NMike Arthur <Mike.Arthur@wolfsonmicro.com>
Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/codecs/Kconfig

@@ -29,6 +29,7 @@ config SND_SOC_ALL_CODECS
 	select SND_SOC_WM8400 if MFD_WM8400
 	select SND_SOC_WM8510 if SND_SOC_I2C_AND_SPI
 	select SND_SOC_WM8580 if I2C
+	select SND_SOC_WM8711 if I2C
 	select SND_SOC_WM8728 if SND_SOC_I2C_AND_SPI
 	select SND_SOC_WM8731 if SND_SOC_I2C_AND_SPI
 	select SND_SOC_WM8750 if SND_SOC_I2C_AND_SPI
@@ -120,6 +121,9 @@ config SND_SOC_WM8510
 config SND_SOC_WM8580
 	tristate
 
+config SND_SOC_WM8711
+	tristate
+
 config SND_SOC_WM8728
 	tristate
 

sound/soc/codecs/Makefile

@@ -17,6 +17,7 @@ snd-soc-wm8350-objs := wm8350.o
 snd-soc-wm8400-objs := wm8400.o
 snd-soc-wm8510-objs := wm8510.o
 snd-soc-wm8580-objs := wm8580.o
+snd-soc-wm8711-objs := wm8711.o
 snd-soc-wm8728-objs := wm8728.o
 snd-soc-wm8731-objs := wm8731.o
 snd-soc-wm8750-objs := wm8750.o
@@ -48,6 +49,7 @@ obj-$(CONFIG_SND_SOC_WM8350)	+= snd-soc-wm8350.o
 obj-$(CONFIG_SND_SOC_WM8400)	+= snd-soc-wm8400.o
 obj-$(CONFIG_SND_SOC_WM8510)	+= snd-soc-wm8510.o
 obj-$(CONFIG_SND_SOC_WM8580)	+= snd-soc-wm8580.o
+obj-$(CONFIG_SND_SOC_WM8711)	+= snd-soc-wm8711.o
 obj-$(CONFIG_SND_SOC_WM8728)	+= snd-soc-wm8728.o
 obj-$(CONFIG_SND_SOC_WM8731)	+= snd-soc-wm8731.o
 obj-$(CONFIG_SND_SOC_WM8750)	+= snd-soc-wm8750.o

sound/soc/codecs/wm8711.c

+/*
+ * 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 <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 "wm8711.h"
+
+#define AUDIO_NAME "wm8711"
+#define WM8711_VERSION "0.3"
+
+/* codec private data */
+struct wm8711_priv {
+	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
+};
+
+/*
+ * read wm8711 register cache
+ */
+static inline unsigned int wm8711_read_reg_cache(struct snd_soc_codec *codec,
+	unsigned int reg)
+{
+	u16 *cache = codec->reg_cache;
+	if (reg == WM8711_RESET)
+		return 0;
+	if (reg >= WM8711_CACHEREGNUM)
+		return -1;
+	return cache[reg];
+}
+
+/*
+ * write wm8711 register cache
+ */
+static inline void wm8711_write_reg_cache(struct snd_soc_codec *codec,
+	u16 reg, unsigned int value)
+{
+	u16 *cache = codec->reg_cache;
+	if (reg >= WM8711_CACHEREGNUM)
+		return;
+	cache[reg] = value;
+}
+
+/*
+ * write to the WM8711 register space
+ */
+static int wm8711_write(struct snd_soc_codec *codec, unsigned int reg,
+	unsigned int value)
+{
+	u8 data[2];
+
+	/* data is
+	 *   D15..D9 WM8753 register offset
+	 *   D8...D0 register data
+	 */
+	data[0] = (reg << 1) | ((value >> 8) & 0x0001);
+	data[1] = value & 0x00ff;
+
+	wm8711_write_reg_cache(codec, reg, value);
+	if (codec->hw_write(codec->control_data, data, 2) == 2)
+		return 0;
+	else
+		return -EIO;
+}
+
+#define wm8711_reset(c)	wm8711_write(c, WM8711_RESET, 0)
+
+static const struct snd_kcontrol_new wm8711_snd_controls[] = {
+
+SOC_DOUBLE_R("Master Playback Volume", WM8711_LOUT1V, WM8711_ROUT1V,
+	0, 127, 0),
+SOC_DOUBLE_R("Master Playback ZC Switch", WM8711_LOUT1V, WM8711_ROUT1V,
+	7, 1, 0),
+
+};
+
+/* add non dapm controls */
+static int wm8711_add_controls(struct snd_soc_codec *codec)
+{
+	int err, i;
+
+	for (i = 0; i < ARRAY_SIZE(wm8711_snd_controls); i++) {
+		err = snd_ctl_add(codec->card,
+				snd_soc_cnew(&wm8711_snd_controls[i], codec,
+					NULL));
+		if (err < 0)
+			return err;
+	}
+
+	return 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 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"},
+};
+
+static int wm8711_add_widgets(struct snd_soc_codec *codec)
+{
+	snd_soc_dapm_new_controls(codec, wm8711_dapm_widgets,
+				  ARRAY_SIZE(wm8711_dapm_widgets));
+
+	snd_soc_dapm_add_routes(codec, intercon, ARRAY_SIZE(intercon));
+
+	snd_soc_dapm_new_widgets(codec);
+	return 0;
+}
+
+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 = codec->private_data;
+	u16 iface = wm8711_read_reg_cache(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;
+
+	wm8711_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;
+	}
+
+	wm8711_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 */
+	wm8711_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);
+		wm8711_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 = wm8711_read_reg_cache(codec, WM8711_APDIGI) & 0xfff7;
+
+	if (mute)
+		wm8711_write(codec, WM8711_APDIGI, mute_reg | 0x8);
+	else
+		wm8711_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 = codec->private_data;
+
+	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 */
+	wm8711_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 = wm8711_read_reg_cache(codec, WM8711_PWR) & 0xff7f;
+
+	switch (level) {
+	case SND_SOC_BIAS_ON:
+		wm8711_write(codec, WM8711_PWR, reg);
+		break;
+	case SND_SOC_BIAS_PREPARE:
+		break;
+	case SND_SOC_BIAS_STANDBY:
+		wm8711_write(codec, WM8711_PWR, reg | 0x0040);
+		break;
+	case SND_SOC_BIAS_OFF:
+		wm8711_write(codec, WM8711_ACTIVE, 0x0);
+		wm8711_write(codec, WM8711_PWR, 0xffff);
+		break;
+	}
+	codec->bias_level = level;
+	return 0;
+}
+
+#define WM8711_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\
+		SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050 |\
+		SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |\
+		SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 |\
+		SNDRV_PCM_RATE_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,
+};
+
+struct snd_soc_dai wm8711_dai = {
+	.name = "WM8711",
+	.playback = {
+		.stream_name = "Playback",
+		.channels_min = 1,
+		.channels_max = 2,
+		.rates = WM8711_RATES,
+		.formats = WM8711_FORMATS,},
+	.ops = &wm8711_ops,
+};
+EXPORT_SYMBOL_GPL(wm8711_dai);
+
+static int wm8711_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;
+
+	wm8711_write(codec, WM8711_ACTIVE, 0x0);
+	wm8711_set_bias_level(codec, SND_SOC_BIAS_OFF);
+	return 0;
+}
+
+static int wm8711_resume(struct platform_device *pdev)
+{
+	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
+	struct snd_soc_codec *codec = socdev->card->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);
+	wm8711_set_bias_level(codec, codec->suspend_bias_level);
+	return 0;
+}
+
+/*
+ * initialise the WM8711 driver
+ * register the mixer and dsp interfaces with the kernel
+ */
+static int wm8711_init(struct snd_soc_device *socdev)
+{
+	struct snd_soc_codec *codec = socdev->card->codec;
+	int reg, ret = 0;
+
+	codec->name = "WM8711";
+	codec->owner = THIS_MODULE;
+	codec->read = wm8711_read_reg_cache;
+	codec->write = wm8711_write;
+	codec->set_bias_level = wm8711_set_bias_level;
+	codec->dai = &wm8711_dai;
+	codec->num_dai = 1;
+	codec->reg_cache_size = ARRAY_SIZE(wm8711_reg);
+	codec->reg_cache = kmemdup(wm8711_reg, sizeof(wm8711_reg), GFP_KERNEL);
+
+	if (codec->reg_cache == NULL)
+		return -ENOMEM;
+
+	wm8711_reset(codec);
+
+	/* register pcms */
+	ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
+	if (ret < 0) {
+		printk(KERN_ERR "wm8711: failed to create pcms\n");
+		goto pcm_err;
+	}
+
+	/* power on device */
+	wm8711_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
+
+	/* set the update bits */
+	reg = wm8711_read_reg_cache(codec, WM8711_LOUT1V);
+	wm8711_write(codec, WM8711_LOUT1V, reg | 0x0100);
+	reg = wm8711_read_reg_cache(codec, WM8711_ROUT1V);
+	wm8711_write(codec, WM8711_ROUT1V, reg | 0x0100);
+
+	wm8711_add_controls(codec);
+	wm8711_add_widgets(codec);
+	ret = snd_soc_init_card(socdev);
+	if (ret < 0) {
+		printk(KERN_ERR "wm8711: failed to register card\n");
+		goto card_err;
+	}
+	return ret;
+
+card_err:
+	snd_soc_free_pcms(socdev);
+	snd_soc_dapm_free(socdev);
+pcm_err:
+	kfree(codec->reg_cache);
+	return ret;
+}
+
+static struct snd_soc_device *wm8711_socdev;
+
+#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
+
+/*
+ * WM8711 2 wire address is determined by GPIO5
+ * state during powerup.
+ *    low  = 0x1a
+ *    high = 0x1b
+ */
+#define I2C_DRIVERID_WM8711 0xfefe /* liam -  need a proper id */
+
+static unsigned short normal_i2c[] = { 0, I2C_CLIENT_END };
+
+/* Magic definition of all other variables and things */
+I2C_CLIENT_INSMOD;
+
+static struct i2c_driver wm8711_i2c_driver;
+static struct i2c_client client_template;
+
+/* If the i2c layer weren't so broken, we could pass this kind of data
+   around */
+
+static int wm8711_codec_probe(struct i2c_adapter *adap, int addr, int kind)
+{
+	struct snd_soc_device *socdev = wm8711_socdev;
+	struct wm8711_setup_data *setup = socdev->codec_data;
+	struct snd_soc_codec *codec = socdev->card->codec;
+	struct i2c_client *i2c;
+	int ret;
+
+	if (addr != setup->i2c_address)
+		return -ENODEV;
+
+	client_template.adapter = adap;
+	client_template.addr = addr;
+
+	i2c = kmemdup(&client_template, sizeof(client_template), GFP_KERNEL);
+	if (i2c == NULL) {
+		kfree(codec);
+		return -ENOMEM;
+	}
+
+	i2c_set_clientdata(i2c, codec);
+
+	codec->control_data = i2c;
+
+	ret = i2c_attach_client(i2c);
+	if (ret < 0) {
+		pr_err("failed to attach codec at addr %x\n", addr);
+		goto err;
+	}
+
+	ret = wm8711_init(socdev);
+	if (ret < 0) {
+		pr_err("failed to initialise WM8711\n");
+		goto err;
+	}
+	return ret;
+
+err:
+	kfree(codec);
+	kfree(i2c);
+	return ret;
+}
+
+static int wm8711_i2c_detach(struct i2c_client *client)
+{
+	struct snd_soc_codec *codec = i2c_get_clientdata(client);
+
+	i2c_detach_client(client);
+	kfree(codec->reg_cache);
+	kfree(client);
+	return 0;
+}
+
+static int wm8711_i2c_attach(struct i2c_adapter *adap)
+{
+	return i2c_probe(adap, &addr_data, wm8711_codec_probe);
+}
+
+/* corgi i2c codec control layer */
+static struct i2c_driver wm8711_i2c_driver = {
+	.driver = {
+		.name = "WM8711 I2C Codec",
+		.owner = THIS_MODULE,
+	},
+	.id =             I2C_DRIVERID_WM8711,
+	.attach_adapter = wm8711_i2c_attach,
+	.detach_client =  wm8711_i2c_detach,
+	.command =        NULL,
+};
+
+static struct i2c_client client_template = {
+	.name =   "WM8711",
+	.driver = &wm8711_i2c_driver,
+};
+#endif
+
+static int wm8711_probe(struct platform_device *pdev)
+{
+	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
+	struct wm8711_setup_data *setup;
+	struct snd_soc_codec *codec;
+	struct wm8711_priv *wm8711;
+	int ret = 0;
+
+	pr_info("WM8711 Audio Codec %s", WM8711_VERSION);
+
+	setup = socdev->codec_data;
+	codec = kzalloc(sizeof(struct snd_soc_codec), GFP_KERNEL);
+	if (codec == NULL)
+		return -ENOMEM;
+
+	wm8711 = kzalloc(sizeof(struct wm8711_priv), GFP_KERNEL);
+	if (wm8711 == NULL) {
+		kfree(codec);
+		return -ENOMEM;
+	}
+
+	codec->private_data = wm8711;
+	socdev->card->codec = codec;
+	mutex_init(&codec->mutex);
+	INIT_LIST_HEAD(&codec->dapm_widgets);
+	INIT_LIST_HEAD(&codec->dapm_paths);
+
+	wm8711_socdev = socdev;
+#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
+	if (setup->i2c_address) {
+		normal_i2c[0] = setup->i2c_address;
+		codec->hw_write = (hw_write_t)i2c_master_send;
+		ret = i2c_add_driver(&wm8711_i2c_driver);
+		if (ret != 0)
+			printk(KERN_ERR "can't add i2c driver");
+	}
+#else
+	/* Add other interfaces here */
+#endif
+	return ret;
+}
+
+/* power down chip */
+static int wm8711_remove(struct platform_device *pdev)
+{
+	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
+	struct snd_soc_codec *codec = socdev->card->codec;
+
+	if (codec->control_data)
+		wm8711_set_bias_level(codec, SND_SOC_BIAS_OFF);
+
+	snd_soc_free_pcms(socdev);
+	snd_soc_dapm_free(socdev);
+#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
+	i2c_del_driver(&wm8711_i2c_driver);
+#endif
+	kfree(codec->private_data);
+	kfree(codec);
+
+	return 0;
+}
+
+struct snd_soc_codec_device soc_codec_dev_wm8711 = {
+	.probe = 	wm8711_probe,
+	.remove = 	wm8711_remove,
+	.suspend = 	wm8711_suspend,
+	.resume =	wm8711_resume,
+};
+EXPORT_SYMBOL_GPL(soc_codec_dev_wm8711);
+
+static int __init wm8711_modinit(void)
+{
+	return snd_soc_register_dai(&wm8711_dai);
+}
+module_init(wm8711_modinit);
+
+static void __exit wm8711_exit(void)
+{
+	snd_soc_unregister_dai(&wm8711_dai);
+}
+module_exit(wm8711_exit);
+
+MODULE_DESCRIPTION("ASoC WM8711 driver");
+MODULE_AUTHOR("Mike Arthur");
+MODULE_LICENSE("GPL");

sound/soc/codecs/wm8711.h

+/*
+ * wm8711.h  --  WM8711 Soc Audio driver
+ *
+ * Copyright 2006 Wolfson Microelectronics
+ *
+ * Author: Mike Arthur <linux@wolfsonmicro.com>
+ *
+ * Based on wm8731.h
+ *
+ * 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.
+ */
+
+#ifndef _WM8711_H
+#define _WM8711_H
+
+/* WM8711 register space */
+
+#define WM8711_LOUT1V   0x02
+#define WM8711_ROUT1V   0x03
+#define WM8711_APANA    0x04
+#define WM8711_APDIGI   0x05
+#define WM8711_PWR      0x06
+#define WM8711_IFACE    0x07
+#define WM8711_SRATE    0x08
+#define WM8711_ACTIVE   0x09
+#define WM8711_RESET	0x0f
+
+#define WM8711_CACHEREGNUM 	8
+
+#define WM8711_SYSCLK	0
+#define WM8711_DAI		0
+
+struct wm8711_setup_data {
+	unsigned short i2c_address;
+};
+
+extern struct snd_soc_dai wm8711_dai;
+extern struct snd_soc_codec_device soc_codec_dev_wm8711;
+
+#endif