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: Mike Arthur <Mike.Arthur@wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 685 insertions, 0 deletions

diff --git a/sound/soc/codecs/wm8711.c b/sound/soc/codecs/wm8711.c
new file mode 100644
index 000000000000..84ead3f9293f
--- /dev/null
+++ b/sound/soc/codecs/wm8711.c
@@ -0,0 +1,685 @@
+/*
+ * 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");