sound/soc/codecs/cros_ec_codec.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright 2019 Google, Inc.
  *
  * ChromeOS Embedded Controller codec driver.
  *
  * This driver uses the cros-ec interface to communicate with the ChromeOS
  * EC for audio function.
  */

 #include <linux/delay.h>
 #include <linux/device.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/platform_data/cros_ec_commands.h>
 #include <linux/platform_data/cros_ec_proto.h>
 #include <linux/platform_device.h>
 #include <sound/pcm.h>
 #include <sound/pcm_params.h>
 #include <sound/soc.h>
 #include <sound/tlv.h>

 struct cros_ec_codec_priv {
 	struct device *dev;
 	struct cros_ec_device *ec_device;
 };

 static int send_ec_host_command(struct cros_ec_device *ec_dev, uint32_t cmd,
 				uint8_t *out, size_t outsize,
 				uint8_t *in, size_t insize)
 {
 	int ret;
 	struct cros_ec_command *msg;

 	msg = kmalloc(sizeof(*msg) + max(outsize, insize), GFP_KERNEL);
 	if (!msg)
 		return -ENOMEM;

 	msg->version = 0;
 	msg->command = cmd;
 	msg->outsize = outsize;
 	msg->insize = insize;

 	if (outsize)
 		memcpy(msg->data, out, outsize);

 	ret = cros_ec_cmd_xfer_status(ec_dev, msg);
 	if (ret < 0)
 		goto error;

 	if (insize)
 		memcpy(in, msg->data, insize);

 	ret = 0;
 error:
 	kfree(msg);
 	return ret;
 }

 static int dmic_get_gain(struct snd_kcontrol *kcontrol,
 			 struct snd_ctl_elem_value *ucontrol)
 {
 	struct snd_soc_component *component =
 		snd_soc_kcontrol_component(kcontrol);
 	struct cros_ec_codec_priv *priv =
 		snd_soc_component_get_drvdata(component);
 	struct ec_param_ec_codec_dmic p;
 	struct ec_response_ec_codec_dmic_get_gain r;
 	int ret;

 	p.cmd = EC_CODEC_DMIC_GET_GAIN;
 	ret = send_ec_host_command(priv->ec_device, EC_CMD_EC_CODEC_DMIC,
 				   (uint8_t *)&p, sizeof(p),
 				   (uint8_t *)&r, sizeof(r));
 	if (ret < 0)
 		return ret;

 	ucontrol->value.integer.value[0] = r.left;
 	ucontrol->value.integer.value[1] = r.right;

 	return 0;
 }

 static int dmic_put_gain(struct snd_kcontrol *kcontrol,
 			 struct snd_ctl_elem_value *ucontrol)
 {
 	struct snd_soc_component *component =
 		snd_soc_kcontrol_component(kcontrol);
 	struct cros_ec_codec_priv *priv =
 		snd_soc_component_get_drvdata(component);
 	struct soc_mixer_control *control =
 		(struct soc_mixer_control *)kcontrol->private_value;
 	int max_dmic_gain = control->max;
 	int left = ucontrol->value.integer.value[0];
 	int right = ucontrol->value.integer.value[1];
 	struct ec_param_ec_codec_dmic p;

 	if (left > max_dmic_gain || right > max_dmic_gain)
 		return -EINVAL;

 	dev_dbg(component->dev, "set mic gain to %u, %u\n", left, right);

 	p.cmd = EC_CODEC_DMIC_SET_GAIN;
 	p.set_gain_param.left = left;
 	p.set_gain_param.right = right;
 	return send_ec_host_command(priv->ec_device, EC_CMD_EC_CODEC_DMIC,
 				    (uint8_t *)&p, sizeof(p), NULL, 0);
 }

 static const DECLARE_TLV_DB_SCALE(dmic_gain_tlv, 0, 100, 0);

 enum {
 	DMIC_CTL_GAIN = 0,
 };

 static struct snd_kcontrol_new dmic_controls[] = {
 	[DMIC_CTL_GAIN] =
 		SOC_DOUBLE_EXT_TLV("EC Mic Gain", SND_SOC_NOPM, SND_SOC_NOPM,
 				   0, 0, 0, dmic_get_gain, dmic_put_gain,
 				   dmic_gain_tlv),
 };

 static int dmic_probe(struct snd_soc_component *component)
 {
 	struct cros_ec_codec_priv *priv =
 		snd_soc_component_get_drvdata(component);
 	struct device *dev = priv->dev;
 	int ret, val;
 	struct soc_mixer_control *control;

 	ret = device_property_read_u32(dev, "max-dmic-gain", &val);
 	if (ret) {
 		dev_err(dev, "Failed to read 'max-dmic-gain'\n");
 		return ret;
 	}

 	control = (struct soc_mixer_control *)
 		dmic_controls[DMIC_CTL_GAIN].private_value;
 	control->max = val;
 	control->platform_max = val;

 	return snd_soc_add_component_controls(component,
 			&dmic_controls[DMIC_CTL_GAIN], 1);
 }

 static int i2s_rx_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 cros_ec_codec_priv *priv =
 		snd_soc_component_get_drvdata(component);
 	struct ec_param_ec_codec_i2s_rx p;
 	enum ec_codec_i2s_rx_sample_depth depth;
 	int ret;

 	if (params_rate(params) != 48000)
 		return -EINVAL;

 	switch (params_format(params)) {
 	case SNDRV_PCM_FORMAT_S16_LE:
 		depth = EC_CODEC_I2S_RX_SAMPLE_DEPTH_16;
 		break;
 	case SNDRV_PCM_FORMAT_S24_LE:
 		depth = EC_CODEC_I2S_RX_SAMPLE_DEPTH_24;
 		break;
 	default:
 		return -EINVAL;
 	}

 	dev_dbg(component->dev, "set depth to %u\n", depth);

 	p.cmd = EC_CODEC_I2S_RX_SET_SAMPLE_DEPTH;
 	p.set_sample_depth_param.depth = depth;
 	ret = send_ec_host_command(priv->ec_device, EC_CMD_EC_CODEC_I2S_RX,
 				   (uint8_t *)&p, sizeof(p), NULL, 0);
 	if (ret < 0)
 		return ret;

 	dev_dbg(component->dev, "set bclk to %u\n",
 		snd_soc_params_to_bclk(params));

 	p.cmd = EC_CODEC_I2S_RX_SET_BCLK;
 	p.set_bclk_param.bclk = snd_soc_params_to_bclk(params);
 	return send_ec_host_command(priv->ec_device, EC_CMD_EC_CODEC_I2S_RX,
 				    (uint8_t *)&p, sizeof(p), NULL, 0);
 }

 static int i2s_rx_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
 {
 	struct snd_soc_component *component = dai->component;
 	struct cros_ec_codec_priv *priv =
 		snd_soc_component_get_drvdata(component);
 	struct ec_param_ec_codec_i2s_rx p;
 	enum ec_codec_i2s_rx_daifmt daifmt;

 	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 	case SND_SOC_DAIFMT_CBS_CFS:
 		break;
 	default:
 		return -EINVAL;
 	}

 	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 	case SND_SOC_DAIFMT_NB_NF:
 		break;
 	default:
 		return -EINVAL;
 	}

 	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 	case SND_SOC_DAIFMT_I2S:
 		daifmt = EC_CODEC_I2S_RX_DAIFMT_I2S;
 		break;
 	case SND_SOC_DAIFMT_RIGHT_J:
 		daifmt = EC_CODEC_I2S_RX_DAIFMT_RIGHT_J;
 		break;
 	case SND_SOC_DAIFMT_LEFT_J:
 		daifmt = EC_CODEC_I2S_RX_DAIFMT_LEFT_J;
 		break;
 	default:
 		return -EINVAL;
 	}

 	dev_dbg(component->dev, "set format to %u\n", daifmt);

 	p.cmd = EC_CODEC_I2S_RX_SET_DAIFMT;
 	p.set_daifmt_param.daifmt = daifmt;
 	return send_ec_host_command(priv->ec_device, EC_CMD_EC_CODEC_I2S_RX,
 				    (uint8_t *)&p, sizeof(p), NULL, 0);
 }

 static const struct snd_soc_dai_ops i2s_rx_dai_ops = {
 	.hw_params = i2s_rx_hw_params,
 	.set_fmt = i2s_rx_set_fmt,
 };

 static int i2s_rx_event(struct snd_soc_dapm_widget *w,
 			struct snd_kcontrol *kcontrol, int event)
 {
 	struct snd_soc_component *component =
 		snd_soc_dapm_to_component(w->dapm);
 	struct cros_ec_codec_priv *priv =
 		snd_soc_component_get_drvdata(component);
 	struct ec_param_ec_codec_i2s_rx p;

 	switch (event) {
 	case SND_SOC_DAPM_PRE_PMU:
 		dev_dbg(component->dev, "enable I2S RX\n");
 		p.cmd = EC_CODEC_I2S_RX_ENABLE;
 		break;
 	case SND_SOC_DAPM_PRE_PMD:
 		dev_dbg(component->dev, "disable I2S RX\n");
 		p.cmd = EC_CODEC_I2S_RX_DISABLE;
 		break;
 	default:
 		return 0;
 	}

 	return send_ec_host_command(priv->ec_device, EC_CMD_EC_CODEC_I2S_RX,
 				    (uint8_t *)&p, sizeof(p), NULL, 0);
 }

 static struct snd_soc_dapm_widget i2s_rx_dapm_widgets[] = {
 	SND_SOC_DAPM_INPUT("DMIC"),
 	SND_SOC_DAPM_SUPPLY("I2S RX Enable", SND_SOC_NOPM, 0, 0, i2s_rx_event,
 			    SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_PRE_PMD),
 	SND_SOC_DAPM_AIF_OUT("I2S RX", "I2S Capture", 0, SND_SOC_NOPM, 0, 0),
 };

 static struct snd_soc_dapm_route i2s_rx_dapm_routes[] = {
 	{"I2S RX", NULL, "DMIC"},
 	{"I2S RX", NULL, "I2S RX Enable"},
 };

 static struct snd_soc_dai_driver i2s_rx_dai_driver = {
 	.name = "EC Codec I2S RX",
 	.capture = {
 		.stream_name = "I2S Capture",
 		.channels_min = 2,
 		.channels_max = 2,
 		.rates = SNDRV_PCM_RATE_48000,
 		.formats = SNDRV_PCM_FMTBIT_S16_LE |
 			SNDRV_PCM_FMTBIT_S24_LE,
 	},
 	.ops = &i2s_rx_dai_ops,
 };

 static int i2s_rx_probe(struct snd_soc_component *component)
 {
 	return dmic_probe(component);
 }

 static const struct snd_soc_component_driver i2s_rx_component_driver = {
 	.probe			= i2s_rx_probe,
 	.dapm_widgets		= i2s_rx_dapm_widgets,
 	.num_dapm_widgets	= ARRAY_SIZE(i2s_rx_dapm_widgets),
 	.dapm_routes		= i2s_rx_dapm_routes,
 	.num_dapm_routes	= ARRAY_SIZE(i2s_rx_dapm_routes),
 };

 static int cros_ec_codec_platform_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct cros_ec_device *ec_device = dev_get_drvdata(pdev->dev.parent);
 	struct cros_ec_codec_priv *priv;

 	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 	if (!priv)
 		return -ENOMEM;

 	priv->dev = dev;
 	priv->ec_device = ec_device;

 	platform_set_drvdata(pdev, priv);

 	return devm_snd_soc_register_component(dev, &i2s_rx_component_driver,
 					       &i2s_rx_dai_driver, 1);
 }

 #ifdef CONFIG_OF
 static const struct of_device_id cros_ec_codec_of_match[] = {
 	{ .compatible = "google,cros-ec-codec" },
 	{},
 };
 MODULE_DEVICE_TABLE(of, cros_ec_codec_of_match);
 #endif

 static struct platform_driver cros_ec_codec_platform_driver = {
 	.driver = {
 		.name = "cros-ec-codec",
 		.of_match_table = of_match_ptr(cros_ec_codec_of_match),
 	},
 	.probe = cros_ec_codec_platform_probe,
 };

 module_platform_driver(cros_ec_codec_platform_driver);

 MODULE_LICENSE("GPL v2");
 MODULE_DESCRIPTION("ChromeOS EC codec driver");
 MODULE_AUTHOR("Cheng-Yi Chiang <cychiang@chromium.org>");
 MODULE_ALIAS("platform:cros-ec-codec");
	// SPDX-License-Identifier: GPL-2.0
	/*
	* Copyright 2019 Google, Inc.
	*
	* ChromeOS Embedded Controller codec driver.
	*
	* This driver uses the cros-ec interface to communicate with the ChromeOS
	* EC for audio function.
	*/

	#include <linux/delay.h>
	#include <linux/device.h>
	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/platform_data/cros_ec_commands.h>
	#include <linux/platform_data/cros_ec_proto.h>
	#include <linux/platform_device.h>
	#include <sound/pcm.h>
	#include <sound/pcm_params.h>
	#include <sound/soc.h>
	#include <sound/tlv.h>

	struct cros_ec_codec_priv {
	struct device *dev;
	struct cros_ec_device *ec_device;
	};

	static int send_ec_host_command(struct cros_ec_device *ec_dev, uint32_t cmd,
	uint8_t *out, size_t outsize,
	uint8_t *in, size_t insize)
	{
	int ret;
	struct cros_ec_command *msg;

	msg = kmalloc(sizeof(*msg) + max(outsize, insize), GFP_KERNEL);
	if (!msg)
	return -ENOMEM;

	msg->version = 0;
	msg->command = cmd;
	msg->outsize = outsize;
	msg->insize = insize;

	if (outsize)
	memcpy(msg->data, out, outsize);

	ret = cros_ec_cmd_xfer_status(ec_dev, msg);
	if (ret < 0)
	goto error;

	if (insize)
	memcpy(in, msg->data, insize);

	ret = 0;
	error:
	kfree(msg);
	return ret;
	}

	static int dmic_get_gain(struct snd_kcontrol *kcontrol,
	struct snd_ctl_elem_value *ucontrol)
	{
	struct snd_soc_component *component =
	snd_soc_kcontrol_component(kcontrol);
	struct cros_ec_codec_priv *priv =
	snd_soc_component_get_drvdata(component);
	struct ec_param_ec_codec_dmic p;
	struct ec_response_ec_codec_dmic_get_gain r;
	int ret;

	p.cmd = EC_CODEC_DMIC_GET_GAIN;
	ret = send_ec_host_command(priv->ec_device, EC_CMD_EC_CODEC_DMIC,
	(uint8_t *)&p, sizeof(p),
	(uint8_t *)&r, sizeof(r));
	if (ret < 0)
	return ret;

	ucontrol->value.integer.value[0] = r.left;
	ucontrol->value.integer.value[1] = r.right;

	return 0;
	}

	static int dmic_put_gain(struct snd_kcontrol *kcontrol,
	struct snd_ctl_elem_value *ucontrol)
	{
	struct snd_soc_component *component =
	snd_soc_kcontrol_component(kcontrol);
	struct cros_ec_codec_priv *priv =
	snd_soc_component_get_drvdata(component);
	struct soc_mixer_control *control =
	(struct soc_mixer_control *)kcontrol->private_value;
	int max_dmic_gain = control->max;
	int left = ucontrol->value.integer.value[0];
	int right = ucontrol->value.integer.value[1];
	struct ec_param_ec_codec_dmic p;

	if (left > max_dmic_gain \|\| right > max_dmic_gain)
	return -EINVAL;

	dev_dbg(component->dev, "set mic gain to %u, %u\n", left, right);

	p.cmd = EC_CODEC_DMIC_SET_GAIN;
	p.set_gain_param.left = left;
	p.set_gain_param.right = right;
	return send_ec_host_command(priv->ec_device, EC_CMD_EC_CODEC_DMIC,
	(uint8_t *)&p, sizeof(p), NULL, 0);
	}

	static const DECLARE_TLV_DB_SCALE(dmic_gain_tlv, 0, 100, 0);

	enum {
	DMIC_CTL_GAIN = 0,
	};

	static struct snd_kcontrol_new dmic_controls[] = {
	[DMIC_CTL_GAIN] =
	SOC_DOUBLE_EXT_TLV("EC Mic Gain", SND_SOC_NOPM, SND_SOC_NOPM,
	0, 0, 0, dmic_get_gain, dmic_put_gain,
	dmic_gain_tlv),
	};

	static int dmic_probe(struct snd_soc_component *component)
	{
	struct cros_ec_codec_priv *priv =
	snd_soc_component_get_drvdata(component);
	struct device *dev = priv->dev;
	int ret, val;
	struct soc_mixer_control *control;

	ret = device_property_read_u32(dev, "max-dmic-gain", &val);
	if (ret) {
	dev_err(dev, "Failed to read 'max-dmic-gain'\n");
	return ret;
	}

	control = (struct soc_mixer_control *)
	dmic_controls[DMIC_CTL_GAIN].private_value;
	control->max = val;
	control->platform_max = val;

	return snd_soc_add_component_controls(component,
	&dmic_controls[DMIC_CTL_GAIN], 1);
	}

	static int i2s_rx_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 cros_ec_codec_priv *priv =
	snd_soc_component_get_drvdata(component);
	struct ec_param_ec_codec_i2s_rx p;
	enum ec_codec_i2s_rx_sample_depth depth;
	int ret;

	if (params_rate(params) != 48000)
	return -EINVAL;

	switch (params_format(params)) {
	case SNDRV_PCM_FORMAT_S16_LE:
	depth = EC_CODEC_I2S_RX_SAMPLE_DEPTH_16;
	break;
	case SNDRV_PCM_FORMAT_S24_LE:
	depth = EC_CODEC_I2S_RX_SAMPLE_DEPTH_24;
	break;
	default:
	return -EINVAL;
	}

	dev_dbg(component->dev, "set depth to %u\n", depth);

	p.cmd = EC_CODEC_I2S_RX_SET_SAMPLE_DEPTH;
	p.set_sample_depth_param.depth = depth;
	ret = send_ec_host_command(priv->ec_device, EC_CMD_EC_CODEC_I2S_RX,
	(uint8_t *)&p, sizeof(p), NULL, 0);
	if (ret < 0)
	return ret;

	dev_dbg(component->dev, "set bclk to %u\n",
	snd_soc_params_to_bclk(params));

	p.cmd = EC_CODEC_I2S_RX_SET_BCLK;
	p.set_bclk_param.bclk = snd_soc_params_to_bclk(params);
	return send_ec_host_command(priv->ec_device, EC_CMD_EC_CODEC_I2S_RX,
	(uint8_t *)&p, sizeof(p), NULL, 0);
	}

	static int i2s_rx_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
	{
	struct snd_soc_component *component = dai->component;
	struct cros_ec_codec_priv *priv =
	snd_soc_component_get_drvdata(component);
	struct ec_param_ec_codec_i2s_rx p;
	enum ec_codec_i2s_rx_daifmt daifmt;

	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
	case SND_SOC_DAIFMT_CBS_CFS:
	break;
	default:
	return -EINVAL;
	}

	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
	case SND_SOC_DAIFMT_NB_NF:
	break;
	default:
	return -EINVAL;
	}

	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
	case SND_SOC_DAIFMT_I2S:
	daifmt = EC_CODEC_I2S_RX_DAIFMT_I2S;
	break;
	case SND_SOC_DAIFMT_RIGHT_J:
	daifmt = EC_CODEC_I2S_RX_DAIFMT_RIGHT_J;
	break;
	case SND_SOC_DAIFMT_LEFT_J:
	daifmt = EC_CODEC_I2S_RX_DAIFMT_LEFT_J;
	break;
	default:
	return -EINVAL;
	}

	dev_dbg(component->dev, "set format to %u\n", daifmt);

	p.cmd = EC_CODEC_I2S_RX_SET_DAIFMT;
	p.set_daifmt_param.daifmt = daifmt;
	return send_ec_host_command(priv->ec_device, EC_CMD_EC_CODEC_I2S_RX,
	(uint8_t *)&p, sizeof(p), NULL, 0);
	}

	static const struct snd_soc_dai_ops i2s_rx_dai_ops = {
	.hw_params = i2s_rx_hw_params,
	.set_fmt = i2s_rx_set_fmt,
	};

	static int i2s_rx_event(struct snd_soc_dapm_widget *w,
	struct snd_kcontrol *kcontrol, int event)
	{
	struct snd_soc_component *component =
	snd_soc_dapm_to_component(w->dapm);
	struct cros_ec_codec_priv *priv =
	snd_soc_component_get_drvdata(component);
	struct ec_param_ec_codec_i2s_rx p;

	switch (event) {
	case SND_SOC_DAPM_PRE_PMU:
	dev_dbg(component->dev, "enable I2S RX\n");
	p.cmd = EC_CODEC_I2S_RX_ENABLE;
	break;
	case SND_SOC_DAPM_PRE_PMD:
	dev_dbg(component->dev, "disable I2S RX\n");
	p.cmd = EC_CODEC_I2S_RX_DISABLE;
	break;
	default:
	return 0;
	}

	return send_ec_host_command(priv->ec_device, EC_CMD_EC_CODEC_I2S_RX,
	(uint8_t *)&p, sizeof(p), NULL, 0);
	}

	static struct snd_soc_dapm_widget i2s_rx_dapm_widgets[] = {
	SND_SOC_DAPM_INPUT("DMIC"),
	SND_SOC_DAPM_SUPPLY("I2S RX Enable", SND_SOC_NOPM, 0, 0, i2s_rx_event,
	SND_SOC_DAPM_PRE_PMU \| SND_SOC_DAPM_PRE_PMD),
	SND_SOC_DAPM_AIF_OUT("I2S RX", "I2S Capture", 0, SND_SOC_NOPM, 0, 0),
	};

	static struct snd_soc_dapm_route i2s_rx_dapm_routes[] = {
	{"I2S RX", NULL, "DMIC"},
	{"I2S RX", NULL, "I2S RX Enable"},
	};

	static struct snd_soc_dai_driver i2s_rx_dai_driver = {
	.name = "EC Codec I2S RX",
	.capture = {
	.stream_name = "I2S Capture",
	.channels_min = 2,
	.channels_max = 2,
	.rates = SNDRV_PCM_RATE_48000,
	.formats = SNDRV_PCM_FMTBIT_S16_LE \|
	SNDRV_PCM_FMTBIT_S24_LE,
	},
	.ops = &i2s_rx_dai_ops,
	};

	static int i2s_rx_probe(struct snd_soc_component *component)
	{
	return dmic_probe(component);
	}

	static const struct snd_soc_component_driver i2s_rx_component_driver = {
	.probe = i2s_rx_probe,
	.dapm_widgets = i2s_rx_dapm_widgets,
	.num_dapm_widgets = ARRAY_SIZE(i2s_rx_dapm_widgets),
	.dapm_routes = i2s_rx_dapm_routes,
	.num_dapm_routes = ARRAY_SIZE(i2s_rx_dapm_routes),
	};

	static int cros_ec_codec_platform_probe(struct platform_device *pdev)
	{
	struct device *dev = &pdev->dev;
	struct cros_ec_device *ec_device = dev_get_drvdata(pdev->dev.parent);
	struct cros_ec_codec_priv *priv;

	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
	if (!priv)
	return -ENOMEM;

	priv->dev = dev;
	priv->ec_device = ec_device;

	platform_set_drvdata(pdev, priv);

	return devm_snd_soc_register_component(dev, &i2s_rx_component_driver,
	&i2s_rx_dai_driver, 1);
	}

	#ifdef CONFIG_OF
	static const struct of_device_id cros_ec_codec_of_match[] = {
	{ .compatible = "google,cros-ec-codec" },
	{},
	};
	MODULE_DEVICE_TABLE(of, cros_ec_codec_of_match);
	#endif

	static struct platform_driver cros_ec_codec_platform_driver = {
	.driver = {
	.name = "cros-ec-codec",
	.of_match_table = of_match_ptr(cros_ec_codec_of_match),
	},
	.probe = cros_ec_codec_platform_probe,
	};

	module_platform_driver(cros_ec_codec_platform_driver);

	MODULE_LICENSE("GPL v2");
	MODULE_DESCRIPTION("ChromeOS EC codec driver");
	MODULE_AUTHOR("Cheng-Yi Chiang <cychiang@chromium.org>");
	MODULE_ALIAS("platform:cros-ec-codec");