1 files changed, 693 insertions, 0 deletions

diff --git a/sound/soc/codecs/wm8741.c b/sound/soc/codecs/wm8741.c
new file mode 100644
index 000000000..1fedf74da
--- /dev/null
+++ b/sound/soc/codecs/wm8741.c
@@ -0,0 +1,693 @@
+/*
+ * wm8741.c  --  WM8741 ALSA SoC Audio driver
+ *
+ * Copyright 2010-1 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/spi/spi.h>
+#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
+#include <linux/slab.h>
+#include <linux/of_device.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.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",
+};
+
+/* codec private data */
+struct wm8741_priv {
+	struct wm8741_platform_data pdata;
+	struct regmap *regmap;
+	struct regulator_bulk_data supplies[WM8741_NUM_SUPPLIES];
+	unsigned int sysclk;
+	const struct snd_pcm_hw_constraint_list *sysclk_constraints;
+};
+
+static const struct reg_default wm8741_reg_defaults[] = {
+	{  0, 0x0000 },     /* R0  - DACLLSB Attenuation */
+	{  1, 0x0000 },     /* R1  - DACLMSB Attenuation */
+	{  2, 0x0000 },     /* R2  - DACRLSB Attenuation */
+	{  3, 0x0000 },     /* R3  - DACRMSB Attenuation */
+	{  4, 0x0000 },     /* R4  - Volume Control */
+	{  5, 0x000A },     /* R5  - Format Control */
+	{  6, 0x0000 },     /* R6  - Filter Control */
+	{  7, 0x0000 },     /* R7  - Mode Control 1 */
+	{  8, 0x0002 },     /* R8  - Mode Control 2 */
+	{ 32, 0x0002 },     /* R32 - ADDITONAL_CONTROL_1 */
+};
+
+static int wm8741_reset(struct snd_soc_component *component)
+{
+	return snd_soc_component_write(component, 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_stereo[] = {
+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_kcontrol_new wm8741_snd_controls_mono_left[] = {
+SOC_SINGLE_TLV("Fine Playback Volume", WM8741_DACLLSB_ATTENUATION,
+		 1, 255, 1, dac_tlv_fine),
+SOC_SINGLE_TLV("Playback Volume", WM8741_DACLMSB_ATTENUATION,
+		 0, 511, 1, dac_tlv),
+};
+
+static const struct snd_kcontrol_new wm8741_snd_controls_mono_right[] = {
+SOC_SINGLE_TLV("Fine Playback Volume", WM8741_DACRLSB_ATTENUATION,
+		1, 255, 1, dac_tlv_fine),
+SOC_SINGLE_TLV("Playback Volume", 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 wm8741_dapm_routes[] = {
+	{ "VOUTLP", NULL, "DACL" },
+	{ "VOUTLN", NULL, "DACL" },
+	{ "VOUTRP", NULL, "DACR" },
+	{ "VOUTRN", NULL, "DACR" },
+};
+
+static const unsigned int rates_11289[] = {
+	44100, 88200,
+};
+
+static const struct snd_pcm_hw_constraint_list constraints_11289 = {
+	.count	= ARRAY_SIZE(rates_11289),
+	.list	= rates_11289,
+};
+
+static const unsigned int rates_12288[] = {
+	32000, 48000, 96000,
+};
+
+static const struct snd_pcm_hw_constraint_list constraints_12288 = {
+	.count	= ARRAY_SIZE(rates_12288),
+	.list	= rates_12288,
+};
+
+static const unsigned int rates_16384[] = {
+	32000,
+};
+
+static const struct snd_pcm_hw_constraint_list constraints_16384 = {
+	.count	= ARRAY_SIZE(rates_16384),
+	.list	= rates_16384,
+};
+
+static const unsigned int rates_16934[] = {
+	44100, 88200,
+};
+
+static const struct snd_pcm_hw_constraint_list constraints_16934 = {
+	.count	= ARRAY_SIZE(rates_16934),
+	.list	= rates_16934,
+};
+
+static const unsigned int rates_18432[] = {
+	48000, 96000,
+};
+
+static const struct snd_pcm_hw_constraint_list constraints_18432 = {
+	.count	= ARRAY_SIZE(rates_18432),
+	.list	= rates_18432,
+};
+
+static const unsigned int rates_22579[] = {
+	44100, 88200, 176400
+};
+
+static const struct snd_pcm_hw_constraint_list constraints_22579 = {
+	.count	= ARRAY_SIZE(rates_22579),
+	.list	= rates_22579,
+};
+
+static const unsigned int rates_24576[] = {
+	32000, 48000, 96000, 192000
+};
+
+static const struct snd_pcm_hw_constraint_list constraints_24576 = {
+	.count	= ARRAY_SIZE(rates_24576),
+	.list	= rates_24576,
+};
+
+static const unsigned int rates_36864[] = {
+	48000, 96000, 192000
+};
+
+static const struct snd_pcm_hw_constraint_list constraints_36864 = {
+	.count	= ARRAY_SIZE(rates_36864),
+	.list	= rates_36864,
+};
+
+static int wm8741_startup(struct snd_pcm_substream *substream,
+			  struct snd_soc_dai *dai)
+{
+	struct snd_soc_component *component = dai->component;
+	struct wm8741_priv *wm8741 = snd_soc_component_get_drvdata(component);
+
+	if (wm8741->sysclk)
+		snd_pcm_hw_constraint_list(substream->runtime, 0,
+				SNDRV_PCM_HW_PARAM_RATE,
+				wm8741->sysclk_constraints);
+
+	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_component *component = dai->component;
+	struct wm8741_priv *wm8741 = snd_soc_component_get_drvdata(component);
+	unsigned int iface;
+	int i;
+
+	/* The set of sample rates that can be supported depends on the
+	 * MCLK supplied to the CODEC - enforce this.
+	 */
+	if (!wm8741->sysclk) {
+		dev_err(component->dev,
+			"No MCLK configured, call set_sysclk() on init or in hw_params\n");
+		return -EINVAL;
+	}
+
+	/* Find a supported LRCLK rate */
+	for (i = 0; i < wm8741->sysclk_constraints->count; i++) {
+		if (wm8741->sysclk_constraints->list[i] == params_rate(params))
+			break;
+	}
+
+	if (i == wm8741->sysclk_constraints->count) {
+		dev_err(component->dev, "LRCLK %d unsupported with MCLK %d\n",
+			params_rate(params), wm8741->sysclk);
+		return -EINVAL;
+	}
+
+	/* bit size */
+	switch (params_width(params)) {
+	case 16:
+		iface = 0x0;
+		break;
+	case 20:
+		iface = 0x1;
+		break;
+	case 24:
+		iface = 0x2;
+		break;
+	case 32:
+		iface = 0x3;
+		break;
+	default:
+		dev_dbg(component->dev, "wm8741_hw_params:    Unsupported bit size param = %d",
+			params_width(params));
+		return -EINVAL;
+	}
+
+	dev_dbg(component->dev, "wm8741_hw_params:    bit size param = %d, rate param = %d",
+		params_width(params), params_rate(params));
+
+	snd_soc_component_update_bits(component, WM8741_FORMAT_CONTROL, WM8741_IWL_MASK,
+			    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_component *component = codec_dai->component;
+	struct wm8741_priv *wm8741 = snd_soc_component_get_drvdata(component);
+
+	dev_dbg(component->dev, "wm8741_set_dai_sysclk info: freq=%dHz\n", freq);
+
+	switch (freq) {
+	case 0:
+		wm8741->sysclk_constraints = NULL;
+		break;
+	case 11289600:
+		wm8741->sysclk_constraints = &constraints_11289;
+		break;
+	case 12288000:
+		wm8741->sysclk_constraints = &constraints_12288;
+		break;
+	case 16384000:
+		wm8741->sysclk_constraints = &constraints_16384;
+		break;
+	case 16934400:
+		wm8741->sysclk_constraints = &constraints_16934;
+		break;
+	case 18432000:
+		wm8741->sysclk_constraints = &constraints_18432;
+		break;
+	case 22579200:
+	case 33868800:
+		wm8741->sysclk_constraints = &constraints_22579;
+		break;
+	case 24576000:
+		wm8741->sysclk_constraints = &constraints_24576;
+		break;
+	case 36864000:
+		wm8741->sysclk_constraints = &constraints_36864;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	wm8741->sysclk = freq;
+	return 0;
+}
+
+static int wm8741_set_dai_fmt(struct snd_soc_dai *codec_dai,
+		unsigned int fmt)
+{
+	struct snd_soc_component *component = codec_dai->component;
+	unsigned int iface;
+
+	/* 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 = 0x08;
+		break;
+	case SND_SOC_DAIFMT_RIGHT_J:
+		iface = 0x00;
+		break;
+	case SND_SOC_DAIFMT_LEFT_J:
+		iface = 0x04;
+		break;
+	case SND_SOC_DAIFMT_DSP_A:
+		iface = 0x0C;
+		break;
+	case SND_SOC_DAIFMT_DSP_B:
+		iface = 0x1C;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	/* clock inversion */
+	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
+	case SND_SOC_DAIFMT_NB_NF:
+		break;
+	case SND_SOC_DAIFMT_NB_IF:
+		iface |= 0x10;
+		break;
+	case SND_SOC_DAIFMT_IB_NF:
+		iface |= 0x20;
+		break;
+	case SND_SOC_DAIFMT_IB_IF:
+		iface |= 0x30;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+
+	dev_dbg(component->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_component_update_bits(component, WM8741_FORMAT_CONTROL,
+			    WM8741_BCP_MASK | WM8741_LRP_MASK | WM8741_FMT_MASK,
+			    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 const 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,
+		.channels_max = 2,
+		.rates = WM8741_RATES,
+		.formats = WM8741_FORMATS,
+	},
+	.ops = &wm8741_dai_ops,
+};
+
+#ifdef CONFIG_PM
+static int wm8741_resume(struct snd_soc_component *component)
+{
+	snd_soc_component_cache_sync(component);
+	return 0;
+}
+#else
+#define wm8741_resume NULL
+#endif
+
+static int wm8741_configure(struct snd_soc_component *component)
+{
+	struct wm8741_priv *wm8741 = snd_soc_component_get_drvdata(component);
+
+	/* Configure differential mode */
+	switch (wm8741->pdata.diff_mode) {
+	case WM8741_DIFF_MODE_STEREO:
+	case WM8741_DIFF_MODE_STEREO_REVERSED:
+	case WM8741_DIFF_MODE_MONO_LEFT:
+	case WM8741_DIFF_MODE_MONO_RIGHT:
+		snd_soc_component_update_bits(component, WM8741_MODE_CONTROL_2,
+				WM8741_DIFF_MASK,
+				wm8741->pdata.diff_mode << WM8741_DIFF_SHIFT);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	/* Change some default settings - latch VU */
+	snd_soc_component_update_bits(component, WM8741_DACLLSB_ATTENUATION,
+			WM8741_UPDATELL, WM8741_UPDATELL);
+	snd_soc_component_update_bits(component, WM8741_DACLMSB_ATTENUATION,
+			WM8741_UPDATELM, WM8741_UPDATELM);
+	snd_soc_component_update_bits(component, WM8741_DACRLSB_ATTENUATION,
+			WM8741_UPDATERL, WM8741_UPDATERL);
+	snd_soc_component_update_bits(component, WM8741_DACRMSB_ATTENUATION,
+			WM8741_UPDATERM, WM8741_UPDATERM);
+
+	return 0;
+}
+
+static int wm8741_add_controls(struct snd_soc_component *component)
+{
+	struct wm8741_priv *wm8741 = snd_soc_component_get_drvdata(component);
+
+	switch (wm8741->pdata.diff_mode) {
+	case WM8741_DIFF_MODE_STEREO:
+	case WM8741_DIFF_MODE_STEREO_REVERSED:
+		snd_soc_add_component_controls(component,
+				wm8741_snd_controls_stereo,
+				ARRAY_SIZE(wm8741_snd_controls_stereo));
+		break;
+	case WM8741_DIFF_MODE_MONO_LEFT:
+		snd_soc_add_component_controls(component,
+				wm8741_snd_controls_mono_left,
+				ARRAY_SIZE(wm8741_snd_controls_mono_left));
+		break;
+	case WM8741_DIFF_MODE_MONO_RIGHT:
+		snd_soc_add_component_controls(component,
+				wm8741_snd_controls_mono_right,
+				ARRAY_SIZE(wm8741_snd_controls_mono_right));
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int wm8741_probe(struct snd_soc_component *component)
+{
+	struct wm8741_priv *wm8741 = snd_soc_component_get_drvdata(component);
+	int ret = 0;
+
+	ret = regulator_bulk_enable(ARRAY_SIZE(wm8741->supplies),
+				    wm8741->supplies);
+	if (ret != 0) {
+		dev_err(component->dev, "Failed to enable supplies: %d\n", ret);
+		goto err_get;
+	}
+
+	ret = wm8741_reset(component);
+	if (ret < 0) {
+		dev_err(component->dev, "Failed to issue reset\n");
+		goto err_enable;
+	}
+
+	ret = wm8741_configure(component);
+	if (ret < 0) {
+		dev_err(component->dev, "Failed to change default settings\n");
+		goto err_enable;
+	}
+
+	ret = wm8741_add_controls(component);
+	if (ret < 0) {
+		dev_err(component->dev, "Failed to add controls\n");
+		goto err_enable;
+	}
+
+	dev_dbg(component->dev, "Successful registration\n");
+	return ret;
+
+err_enable:
+	regulator_bulk_disable(ARRAY_SIZE(wm8741->supplies), wm8741->supplies);
+err_get:
+	return ret;
+}
+
+static void wm8741_remove(struct snd_soc_component *component)
+{
+	struct wm8741_priv *wm8741 = snd_soc_component_get_drvdata(component);
+
+	regulator_bulk_disable(ARRAY_SIZE(wm8741->supplies), wm8741->supplies);
+}
+
+static const struct snd_soc_component_driver soc_component_dev_wm8741 = {
+	.probe			= wm8741_probe,
+	.remove			= wm8741_remove,
+	.resume			= wm8741_resume,
+	.dapm_widgets		= wm8741_dapm_widgets,
+	.num_dapm_widgets	= ARRAY_SIZE(wm8741_dapm_widgets),
+	.dapm_routes		= wm8741_dapm_routes,
+	.num_dapm_routes	= ARRAY_SIZE(wm8741_dapm_routes),
+	.idle_bias_on		= 1,
+	.use_pmdown_time	= 1,
+	.endianness		= 1,
+	.non_legacy_dai_naming	= 1,
+};
+
+static const struct of_device_id wm8741_of_match[] = {
+	{ .compatible = "wlf,wm8741", },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, wm8741_of_match);
+
+static const struct regmap_config wm8741_regmap = {
+	.reg_bits = 7,
+	.val_bits = 9,
+	.max_register = WM8741_MAX_REGISTER,
+
+	.reg_defaults = wm8741_reg_defaults,
+	.num_reg_defaults = ARRAY_SIZE(wm8741_reg_defaults),
+	.cache_type = REGCACHE_RBTREE,
+};
+
+static int wm8741_set_pdata(struct device *dev, struct wm8741_priv *wm8741)
+{
+	const struct wm8741_platform_data *pdata = dev_get_platdata(dev);
+	u32 diff_mode;
+
+	if (dev->of_node) {
+		if (of_property_read_u32(dev->of_node, "diff-mode", &diff_mode)
+				>= 0)
+			wm8741->pdata.diff_mode = diff_mode;
+	} else {
+		if (pdata != NULL)
+			memcpy(&wm8741->pdata, pdata, sizeof(wm8741->pdata));
+	}
+
+	return 0;
+}
+
+#if IS_ENABLED(CONFIG_I2C)
+static int wm8741_i2c_probe(struct i2c_client *i2c,
+			    const struct i2c_device_id *id)
+{
+	struct wm8741_priv *wm8741;
+	int ret, i;
+
+	wm8741 = devm_kzalloc(&i2c->dev, sizeof(struct wm8741_priv),
+			      GFP_KERNEL);
+	if (wm8741 == NULL)
+		return -ENOMEM;
+
+	for (i = 0; i < ARRAY_SIZE(wm8741->supplies); i++)
+		wm8741->supplies[i].supply = wm8741_supply_names[i];
+
+	ret = devm_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);
+		return ret;
+	}
+
+	wm8741->regmap = devm_regmap_init_i2c(i2c, &wm8741_regmap);
+	if (IS_ERR(wm8741->regmap)) {
+		ret = PTR_ERR(wm8741->regmap);
+		dev_err(&i2c->dev, "Failed to init regmap: %d\n", ret);
+		return ret;
+	}
+
+	ret = wm8741_set_pdata(&i2c->dev, wm8741);
+	if (ret != 0) {
+		dev_err(&i2c->dev, "Failed to set pdata: %d\n", ret);
+		return ret;
+	}
+
+	i2c_set_clientdata(i2c, wm8741);
+
+	ret = devm_snd_soc_register_component(&i2c->dev,
+				     &soc_component_dev_wm8741, &wm8741_dai, 1);
+
+	return ret;
+}
+
+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",
+		.of_match_table = wm8741_of_match,
+	},
+	.probe =    wm8741_i2c_probe,
+	.id_table = wm8741_i2c_id,
+};
+#endif
+
+#if defined(CONFIG_SPI_MASTER)
+static int wm8741_spi_probe(struct spi_device *spi)
+{
+	struct wm8741_priv *wm8741;
+	int ret, i;
+
+	wm8741 = devm_kzalloc(&spi->dev, sizeof(struct wm8741_priv),
+			     GFP_KERNEL);
+	if (wm8741 == NULL)
+		return -ENOMEM;
+
+	for (i = 0; i < ARRAY_SIZE(wm8741->supplies); i++)
+		wm8741->supplies[i].supply = wm8741_supply_names[i];
+
+	ret = devm_regulator_bulk_get(&spi->dev, ARRAY_SIZE(wm8741->supplies),
+				      wm8741->supplies);
+	if (ret != 0) {
+		dev_err(&spi->dev, "Failed to request supplies: %d\n", ret);
+		return ret;
+	}
+
+	wm8741->regmap = devm_regmap_init_spi(spi, &wm8741_regmap);
+	if (IS_ERR(wm8741->regmap)) {
+		ret = PTR_ERR(wm8741->regmap);
+		dev_err(&spi->dev, "Failed to init regmap: %d\n", ret);
+		return ret;
+	}
+
+	ret = wm8741_set_pdata(&spi->dev, wm8741);
+	if (ret != 0) {
+		dev_err(&spi->dev, "Failed to set pdata: %d\n", ret);
+		return ret;
+	}
+
+	spi_set_drvdata(spi, wm8741);
+
+	ret = devm_snd_soc_register_component(&spi->dev,
+			&soc_component_dev_wm8741, &wm8741_dai, 1);
+	return ret;
+}
+
+static struct spi_driver wm8741_spi_driver = {
+	.driver = {
+		.name	= "wm8741",
+		.of_match_table = wm8741_of_match,
+	},
+	.probe		= wm8741_spi_probe,
+};
+#endif /* CONFIG_SPI_MASTER */
+
+static int __init wm8741_modinit(void)
+{
+	int ret = 0;
+
+#if IS_ENABLED(CONFIG_I2C)
+	ret = i2c_add_driver(&wm8741_i2c_driver);
+	if (ret != 0)
+		pr_err("Failed to register WM8741 I2C driver: %d\n", ret);
+#endif
+#if defined(CONFIG_SPI_MASTER)
+	ret = spi_register_driver(&wm8741_spi_driver);
+	if (ret != 0) {
+		printk(KERN_ERR "Failed to register wm8741 SPI driver: %d\n",
+		       ret);
+	}
+#endif
+
+	return ret;
+}
+module_init(wm8741_modinit);
+
+static void __exit wm8741_exit(void)
+{
+#if defined(CONFIG_SPI_MASTER)
+	spi_unregister_driver(&wm8741_spi_driver);
+#endif
+#if IS_ENABLED(CONFIG_I2C)
+	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");