sound/hda/intel-nhlt.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-only
 // Copyright (c) 2015-2019 Intel Corporation

 #include <linux/acpi.h>
 #include <sound/intel-nhlt.h>

 struct nhlt_acpi_table *intel_nhlt_init(struct device *dev)
 {
 	struct nhlt_acpi_table *nhlt;
 	acpi_status status;

 	status = acpi_get_table(ACPI_SIG_NHLT, 0,
 				(struct acpi_table_header **)&nhlt);
 	if (ACPI_FAILURE(status)) {
 		dev_warn(dev, "NHLT table not found\n");
 		return NULL;
 	}

 	return nhlt;
 }
 EXPORT_SYMBOL_GPL(intel_nhlt_init);

 void intel_nhlt_free(struct nhlt_acpi_table *nhlt)
 {
 	acpi_put_table((struct acpi_table_header *)nhlt);
 }
 EXPORT_SYMBOL_GPL(intel_nhlt_free);

 int intel_nhlt_get_dmic_geo(struct device *dev, struct nhlt_acpi_table *nhlt)
 {
 	struct nhlt_endpoint *epnt;
 	struct nhlt_dmic_array_config *cfg;
 	struct nhlt_vendor_dmic_array_config *cfg_vendor;
 	struct nhlt_fmt *fmt_configs;
 	unsigned int dmic_geo = 0;
 	u16 max_ch = 0;
 	u8 i, j;

 	if (!nhlt)
 		return 0;

 	if (nhlt->header.length <= sizeof(struct acpi_table_header)) {
 		dev_warn(dev, "Invalid DMIC description table\n");
 		return 0;
 	}

 	for (j = 0, epnt = nhlt->desc; j < nhlt->endpoint_count; j++,
 	     epnt = (struct nhlt_endpoint *)((u8 *)epnt + epnt->length)) {

 		if (epnt->linktype != NHLT_LINK_DMIC)
 			continue;

 		cfg = (struct nhlt_dmic_array_config  *)(epnt->config.caps);
 		fmt_configs = (struct nhlt_fmt *)(epnt->config.caps + epnt->config.size);

 		/* find max number of channels based on format_configuration */
 		if (fmt_configs->fmt_count) {
 			struct nhlt_fmt_cfg *fmt_cfg = fmt_configs->fmt_config;

 			dev_dbg(dev, "found %d format definitions\n",
 				fmt_configs->fmt_count);

 			for (i = 0; i < fmt_configs->fmt_count; i++) {
 				struct wav_fmt_ext *fmt_ext;

 				fmt_ext = &fmt_cfg->fmt_ext;

 				if (fmt_ext->fmt.channels > max_ch)
 					max_ch = fmt_ext->fmt.channels;

 				/* Move to the next nhlt_fmt_cfg */
 				fmt_cfg = (struct nhlt_fmt_cfg *)(fmt_cfg->config.caps +
 								  fmt_cfg->config.size);
 			}
 			dev_dbg(dev, "max channels found %d\n", max_ch);
 		} else {
 			dev_dbg(dev, "No format information found\n");
 		}

 		if (cfg->device_config.config_type != NHLT_CONFIG_TYPE_MIC_ARRAY) {
 			dmic_geo = max_ch;
 		} else {
 			switch (cfg->array_type) {
 			case NHLT_MIC_ARRAY_2CH_SMALL:
 			case NHLT_MIC_ARRAY_2CH_BIG:
 				dmic_geo = MIC_ARRAY_2CH;
 				break;

 			case NHLT_MIC_ARRAY_4CH_1ST_GEOM:
 			case NHLT_MIC_ARRAY_4CH_L_SHAPED:
 			case NHLT_MIC_ARRAY_4CH_2ND_GEOM:
 				dmic_geo = MIC_ARRAY_4CH;
 				break;
 			case NHLT_MIC_ARRAY_VENDOR_DEFINED:
 				cfg_vendor = (struct nhlt_vendor_dmic_array_config *)cfg;
 				dmic_geo = cfg_vendor->nb_mics;
 				break;
 			default:
 				dev_warn(dev, "%s: undefined DMIC array_type 0x%0x\n",
 					 __func__, cfg->array_type);
 			}

 			if (dmic_geo > 0) {
 				dev_dbg(dev, "Array with %d dmics\n", dmic_geo);
 			}
 			if (max_ch > dmic_geo) {
 				dev_dbg(dev, "max channels %d exceed dmic number %d\n",
 					max_ch, dmic_geo);
 			}
 		}
 	}

 	dev_dbg(dev, "dmic number %d max_ch %d\n", dmic_geo, max_ch);

 	return dmic_geo;
 }
 EXPORT_SYMBOL_GPL(intel_nhlt_get_dmic_geo);

 bool intel_nhlt_has_endpoint_type(struct nhlt_acpi_table *nhlt, u8 link_type)
 {
 	struct nhlt_endpoint *epnt;
 	int i;

 	if (!nhlt)
 		return false;

 	epnt = (struct nhlt_endpoint *)nhlt->desc;
 	for (i = 0; i < nhlt->endpoint_count; i++) {
 		if (epnt->linktype == link_type)
 			return true;

 		epnt = (struct nhlt_endpoint *)((u8 *)epnt + epnt->length);
 	}
 	return false;
 }
 EXPORT_SYMBOL(intel_nhlt_has_endpoint_type);

 int intel_nhlt_ssp_endpoint_mask(struct nhlt_acpi_table *nhlt, u8 device_type)
 {
 	struct nhlt_endpoint *epnt;
 	int ssp_mask = 0;
 	int i;

 	if (!nhlt || (device_type != NHLT_DEVICE_BT && device_type != NHLT_DEVICE_I2S))
 		return 0;

 	epnt = (struct nhlt_endpoint *)nhlt->desc;
 	for (i = 0; i < nhlt->endpoint_count; i++) {
 		if (epnt->linktype == NHLT_LINK_SSP && epnt->device_type == device_type) {
 			/* for SSP the virtual bus id is the SSP port */
 			ssp_mask |= BIT(epnt->virtual_bus_id);
 		}
 		epnt = (struct nhlt_endpoint *)((u8 *)epnt + epnt->length);
 	}

 	return ssp_mask;
 }
 EXPORT_SYMBOL(intel_nhlt_ssp_endpoint_mask);

 #define SSP_BLOB_V1_0_SIZE		84
 #define SSP_BLOB_V1_0_MDIVC_OFFSET	19 /* offset in u32 */

 #define SSP_BLOB_V1_5_SIZE		96
 #define SSP_BLOB_V1_5_MDIVC_OFFSET	21 /* offset in u32 */
 #define SSP_BLOB_VER_1_5		0xEE000105

 #define SSP_BLOB_V2_0_SIZE		88
 #define SSP_BLOB_V2_0_MDIVC_OFFSET	20 /* offset in u32 */
 #define SSP_BLOB_VER_2_0		0xEE000200

 int intel_nhlt_ssp_mclk_mask(struct nhlt_acpi_table *nhlt, int ssp_num)
 {
 	struct nhlt_endpoint *epnt;
 	struct nhlt_fmt *fmt;
 	struct nhlt_fmt_cfg *cfg;
 	int mclk_mask = 0;
 	int i, j;

 	if (!nhlt)
 		return 0;

 	epnt = (struct nhlt_endpoint *)nhlt->desc;
 	for (i = 0; i < nhlt->endpoint_count; i++) {

 		/* we only care about endpoints connected to an audio codec over SSP */
 		if (epnt->linktype == NHLT_LINK_SSP &&
 		    epnt->device_type == NHLT_DEVICE_I2S &&
 		    epnt->virtual_bus_id == ssp_num) {

 			fmt = (struct nhlt_fmt *)(epnt->config.caps + epnt->config.size);
 			cfg = fmt->fmt_config;

 			/*
 			 * In theory all formats should use the same MCLK but it doesn't hurt to
 			 * double-check that the configuration is consistent
 			 */
 			for (j = 0; j < fmt->fmt_count; j++) {
 				u32 *blob;
 				int mdivc_offset;
 				int size;

 				/* first check we have enough data to read the blob type */
 				if (cfg->config.size < 8)
 					return -EINVAL;

 				blob = (u32 *)cfg->config.caps;

 				if (blob[1] == SSP_BLOB_VER_2_0) {
 					mdivc_offset = SSP_BLOB_V2_0_MDIVC_OFFSET;
 					size = SSP_BLOB_V2_0_SIZE;
 				} else if (blob[1] == SSP_BLOB_VER_1_5) {
 					mdivc_offset = SSP_BLOB_V1_5_MDIVC_OFFSET;
 					size = SSP_BLOB_V1_5_SIZE;
 				} else {
 					mdivc_offset = SSP_BLOB_V1_0_MDIVC_OFFSET;
 					size = SSP_BLOB_V1_0_SIZE;
 				}

 				/* make sure we have enough data for the fixed part of the blob */
 				if (cfg->config.size < size)
 					return -EINVAL;

 				mclk_mask |=  blob[mdivc_offset] & GENMASK(1, 0);

 				cfg = (struct nhlt_fmt_cfg *)(cfg->config.caps + cfg->config.size);
 			}
 		}
 		epnt = (struct nhlt_endpoint *)((u8 *)epnt + epnt->length);
 	}

 	/* make sure only one MCLK is used */
 	if (hweight_long(mclk_mask) != 1)
 		return -EINVAL;

 	return mclk_mask;
 }
 EXPORT_SYMBOL(intel_nhlt_ssp_mclk_mask);

 static struct nhlt_specific_cfg *
 nhlt_get_specific_cfg(struct device *dev, struct nhlt_fmt *fmt, u8 num_ch,
 		      u32 rate, u8 vbps, u8 bps, bool ignore_vbps)
 {
 	struct nhlt_fmt_cfg *cfg = fmt->fmt_config;
 	struct wav_fmt *wfmt;
 	u16 _bps, _vbps;
 	int i;

 	dev_dbg(dev, "Endpoint format count=%d\n", fmt->fmt_count);

 	for (i = 0; i < fmt->fmt_count; i++) {
 		wfmt = &cfg->fmt_ext.fmt;
 		_bps = wfmt->bits_per_sample;
 		_vbps = cfg->fmt_ext.sample.valid_bits_per_sample;

 		dev_dbg(dev, "Endpoint format: ch=%d fmt=%d/%d rate=%d\n",
 			wfmt->channels, _vbps, _bps, wfmt->samples_per_sec);

 		/*
 		 * When looking for exact match of configuration ignore the vbps
 		 * from NHLT table when ignore_vbps is true
 		 */
 		if (wfmt->channels == num_ch && wfmt->samples_per_sec == rate &&
 		    (ignore_vbps || vbps == _vbps) && bps == _bps)
 			return &cfg->config;

 		cfg = (struct nhlt_fmt_cfg *)(cfg->config.caps + cfg->config.size);
 	}

 	return NULL;
 }

 static bool nhlt_check_ep_match(struct device *dev, struct nhlt_endpoint *epnt,
 				u32 bus_id, u8 link_type, u8 dir, u8 dev_type)
 {
 	dev_dbg(dev, "Endpoint: vbus_id=%d link_type=%d dir=%d dev_type = %d\n",
 		epnt->virtual_bus_id, epnt->linktype,
 		epnt->direction, epnt->device_type);

 	if ((epnt->virtual_bus_id != bus_id) ||
 	    (epnt->linktype != link_type) ||
 	    (epnt->direction != dir))
 		return false;

 	/* link of type DMIC bypasses device_type check */
 	return epnt->linktype == NHLT_LINK_DMIC ||
 	       epnt->device_type == dev_type;
 }

 struct nhlt_specific_cfg *
 intel_nhlt_get_endpoint_blob(struct device *dev, struct nhlt_acpi_table *nhlt,
 			     u32 bus_id, u8 link_type, u8 vbps, u8 bps,
 			     u8 num_ch, u32 rate, u8 dir, u8 dev_type)
 {
 	struct nhlt_specific_cfg *cfg;
 	struct nhlt_endpoint *epnt;
 	bool ignore_vbps = false;
 	struct nhlt_fmt *fmt;
 	int i;

 	if (!nhlt)
 		return NULL;

 	dev_dbg(dev, "Looking for configuration:\n");
 	dev_dbg(dev, "  vbus_id=%d link_type=%d dir=%d, dev_type=%d\n",
 		bus_id, link_type, dir, dev_type);
 	if (link_type == NHLT_LINK_DMIC && bps == 32 && (vbps == 24 || vbps == 32)) {
 		/*
 		 * The DMIC hardware supports only one type of 32 bits sample
 		 * size, which is 24 bit sampling on the MSB side and bits[1:0]
 		 * are used for indicating the channel number.
 		 * It has been observed that some NHLT tables have the vbps
 		 * specified as 32 while some uses 24.
 		 * The format these variations describe are identical, the
 		 * hardware is configured and behaves the same way.
 		 * Note: when the samples assumed to be vbps=32 then the 'noise'
 		 * introduced by the lower two bits (channel number) have no
 		 * real life implication on audio quality.
 		 */
 		dev_dbg(dev,
 			"  ch=%d fmt=%d rate=%d (vbps is ignored for DMIC 32bit format)\n",
 			num_ch, bps, rate);
 		ignore_vbps = true;
 	} else {
 		dev_dbg(dev, "  ch=%d fmt=%d/%d rate=%d\n", num_ch, vbps, bps, rate);
 	}
 	dev_dbg(dev, "Endpoint count=%d\n", nhlt->endpoint_count);

 	epnt = (struct nhlt_endpoint *)nhlt->desc;

 	for (i = 0; i < nhlt->endpoint_count; i++) {
 		if (nhlt_check_ep_match(dev, epnt, bus_id, link_type, dir, dev_type)) {
 			fmt = (struct nhlt_fmt *)(epnt->config.caps + epnt->config.size);

 			cfg = nhlt_get_specific_cfg(dev, fmt, num_ch, rate,
 						    vbps, bps, ignore_vbps);
 			if (cfg)
 				return cfg;
 		}

 		epnt = (struct nhlt_endpoint *)((u8 *)epnt + epnt->length);
 	}

 	return NULL;
 }
 EXPORT_SYMBOL(intel_nhlt_get_endpoint_blob);

 int intel_nhlt_ssp_device_type(struct device *dev, struct nhlt_acpi_table *nhlt,
 			       u8 virtual_bus_id)
 {
 	struct nhlt_endpoint *epnt;
 	int i;

 	if (!nhlt)
 		return -EINVAL;

 	epnt = (struct nhlt_endpoint *)nhlt->desc;
 	for (i = 0; i < nhlt->endpoint_count; i++) {
 		/* for SSP link the virtual bus id is the SSP port number */
 		if (epnt->linktype == NHLT_LINK_SSP &&
 		    epnt->virtual_bus_id == virtual_bus_id) {
 			dev_dbg(dev, "SSP%d: dev_type=%d\n", virtual_bus_id,
 				epnt->device_type);
 			return epnt->device_type;
 		}

 		epnt = (struct nhlt_endpoint *)((u8 *)epnt + epnt->length);
 	}

 	return -EINVAL;
 }
 EXPORT_SYMBOL(intel_nhlt_ssp_device_type);
	// SPDX-License-Identifier: GPL-2.0-only
	// Copyright (c) 2015-2019 Intel Corporation

	#include <linux/acpi.h>
	#include <sound/intel-nhlt.h>

	struct nhlt_acpi_table intel_nhlt_init(struct device dev)
	{
	struct nhlt_acpi_table *nhlt;
	acpi_status status;

	status = acpi_get_table(ACPI_SIG_NHLT, 0,
	(struct acpi_table_header **)&nhlt);
	if (ACPI_FAILURE(status)) {
	dev_warn(dev, "NHLT table not found\n");
	return NULL;
	}

	return nhlt;
	}
	EXPORT_SYMBOL_GPL(intel_nhlt_init);

	void intel_nhlt_free(struct nhlt_acpi_table *nhlt)
	{
	acpi_put_table((struct acpi_table_header *)nhlt);
	}
	EXPORT_SYMBOL_GPL(intel_nhlt_free);

	int intel_nhlt_get_dmic_geo(struct device dev, struct nhlt_acpi_table nhlt)
	{
	struct nhlt_endpoint *epnt;
	struct nhlt_dmic_array_config *cfg;
	struct nhlt_vendor_dmic_array_config *cfg_vendor;
	struct nhlt_fmt *fmt_configs;
	unsigned int dmic_geo = 0;
	u16 max_ch = 0;
	u8 i, j;

	if (!nhlt)
	return 0;

	if (nhlt->header.length <= sizeof(struct acpi_table_header)) {
	dev_warn(dev, "Invalid DMIC description table\n");
	return 0;
	}

	for (j = 0, epnt = nhlt->desc; j < nhlt->endpoint_count; j++,
	epnt = (struct nhlt_endpoint )((u8 )epnt + epnt->length)) {

	if (epnt->linktype != NHLT_LINK_DMIC)
	continue;

	cfg = (struct nhlt_dmic_array_config *)(epnt->config.caps);
	fmt_configs = (struct nhlt_fmt *)(epnt->config.caps + epnt->config.size);

	/* find max number of channels based on format_configuration */
	if (fmt_configs->fmt_count) {
	struct nhlt_fmt_cfg *fmt_cfg = fmt_configs->fmt_config;

	dev_dbg(dev, "found %d format definitions\n",
	fmt_configs->fmt_count);

	for (i = 0; i < fmt_configs->fmt_count; i++) {
	struct wav_fmt_ext *fmt_ext;

	fmt_ext = &fmt_cfg->fmt_ext;

	if (fmt_ext->fmt.channels > max_ch)
	max_ch = fmt_ext->fmt.channels;

	/* Move to the next nhlt_fmt_cfg */
	fmt_cfg = (struct nhlt_fmt_cfg *)(fmt_cfg->config.caps +
	fmt_cfg->config.size);
	}
	dev_dbg(dev, "max channels found %d\n", max_ch);
	} else {
	dev_dbg(dev, "No format information found\n");
	}

	if (cfg->device_config.config_type != NHLT_CONFIG_TYPE_MIC_ARRAY) {
	dmic_geo = max_ch;
	} else {
	switch (cfg->array_type) {
	case NHLT_MIC_ARRAY_2CH_SMALL:
	case NHLT_MIC_ARRAY_2CH_BIG:
	dmic_geo = MIC_ARRAY_2CH;
	break;

	case NHLT_MIC_ARRAY_4CH_1ST_GEOM:
	case NHLT_MIC_ARRAY_4CH_L_SHAPED:
	case NHLT_MIC_ARRAY_4CH_2ND_GEOM:
	dmic_geo = MIC_ARRAY_4CH;
	break;
	case NHLT_MIC_ARRAY_VENDOR_DEFINED:
	cfg_vendor = (struct nhlt_vendor_dmic_array_config *)cfg;
	dmic_geo = cfg_vendor->nb_mics;
	break;
	default:
	dev_warn(dev, "%s: undefined DMIC array_type 0x%0x\n",
	__func__, cfg->array_type);
	}

	if (dmic_geo > 0) {
	dev_dbg(dev, "Array with %d dmics\n", dmic_geo);
	}
	if (max_ch > dmic_geo) {
	dev_dbg(dev, "max channels %d exceed dmic number %d\n",
	max_ch, dmic_geo);
	}
	}
	}

	dev_dbg(dev, "dmic number %d max_ch %d\n", dmic_geo, max_ch);

	return dmic_geo;
	}
	EXPORT_SYMBOL_GPL(intel_nhlt_get_dmic_geo);

	bool intel_nhlt_has_endpoint_type(struct nhlt_acpi_table *nhlt, u8 link_type)
	{
	struct nhlt_endpoint *epnt;
	int i;

	if (!nhlt)
	return false;

	epnt = (struct nhlt_endpoint *)nhlt->desc;
	for (i = 0; i < nhlt->endpoint_count; i++) {
	if (epnt->linktype == link_type)
	return true;

	epnt = (struct nhlt_endpoint )((u8 )epnt + epnt->length);
	}
	return false;
	}
	EXPORT_SYMBOL(intel_nhlt_has_endpoint_type);

	int intel_nhlt_ssp_endpoint_mask(struct nhlt_acpi_table *nhlt, u8 device_type)
	{
	struct nhlt_endpoint *epnt;
	int ssp_mask = 0;
	int i;

	if (!nhlt \|\| (device_type != NHLT_DEVICE_BT && device_type != NHLT_DEVICE_I2S))
	return 0;

	epnt = (struct nhlt_endpoint *)nhlt->desc;
	for (i = 0; i < nhlt->endpoint_count; i++) {
	if (epnt->linktype == NHLT_LINK_SSP && epnt->device_type == device_type) {
	/* for SSP the virtual bus id is the SSP port */
	ssp_mask \|= BIT(epnt->virtual_bus_id);
	}
	epnt = (struct nhlt_endpoint )((u8 )epnt + epnt->length);
	}

	return ssp_mask;
	}
	EXPORT_SYMBOL(intel_nhlt_ssp_endpoint_mask);

	#define SSP_BLOB_V1_0_SIZE 84
	#define SSP_BLOB_V1_0_MDIVC_OFFSET 19 /* offset in u32 */

	#define SSP_BLOB_V1_5_SIZE 96
	#define SSP_BLOB_V1_5_MDIVC_OFFSET 21 /* offset in u32 */
	#define SSP_BLOB_VER_1_5 0xEE000105

	#define SSP_BLOB_V2_0_SIZE 88
	#define SSP_BLOB_V2_0_MDIVC_OFFSET 20 /* offset in u32 */
	#define SSP_BLOB_VER_2_0 0xEE000200

	int intel_nhlt_ssp_mclk_mask(struct nhlt_acpi_table *nhlt, int ssp_num)
	{
	struct nhlt_endpoint *epnt;
	struct nhlt_fmt *fmt;
	struct nhlt_fmt_cfg *cfg;
	int mclk_mask = 0;
	int i, j;

	if (!nhlt)
	return 0;

	epnt = (struct nhlt_endpoint *)nhlt->desc;
	for (i = 0; i < nhlt->endpoint_count; i++) {

	/* we only care about endpoints connected to an audio codec over SSP */
	if (epnt->linktype == NHLT_LINK_SSP &&
	epnt->device_type == NHLT_DEVICE_I2S &&
	epnt->virtual_bus_id == ssp_num) {

	fmt = (struct nhlt_fmt *)(epnt->config.caps + epnt->config.size);
	cfg = fmt->fmt_config;

	/*
	* In theory all formats should use the same MCLK but it doesn't hurt to
	* double-check that the configuration is consistent
	*/
	for (j = 0; j < fmt->fmt_count; j++) {
	u32 *blob;
	int mdivc_offset;
	int size;

	/* first check we have enough data to read the blob type */
	if (cfg->config.size < 8)
	return -EINVAL;

	blob = (u32 *)cfg->config.caps;

	if (blob[1] == SSP_BLOB_VER_2_0) {
	mdivc_offset = SSP_BLOB_V2_0_MDIVC_OFFSET;
	size = SSP_BLOB_V2_0_SIZE;
	} else if (blob[1] == SSP_BLOB_VER_1_5) {
	mdivc_offset = SSP_BLOB_V1_5_MDIVC_OFFSET;
	size = SSP_BLOB_V1_5_SIZE;
	} else {
	mdivc_offset = SSP_BLOB_V1_0_MDIVC_OFFSET;
	size = SSP_BLOB_V1_0_SIZE;
	}

	/* make sure we have enough data for the fixed part of the blob */
	if (cfg->config.size < size)
	return -EINVAL;

	mclk_mask \|= blob[mdivc_offset] & GENMASK(1, 0);

	cfg = (struct nhlt_fmt_cfg *)(cfg->config.caps + cfg->config.size);
	}
	}
	epnt = (struct nhlt_endpoint )((u8 )epnt + epnt->length);
	}

	/* make sure only one MCLK is used */
	if (hweight_long(mclk_mask) != 1)
	return -EINVAL;

	return mclk_mask;
	}
	EXPORT_SYMBOL(intel_nhlt_ssp_mclk_mask);

	static struct nhlt_specific_cfg *
	nhlt_get_specific_cfg(struct device dev, struct nhlt_fmt fmt, u8 num_ch,
	u32 rate, u8 vbps, u8 bps, bool ignore_vbps)
	{
	struct nhlt_fmt_cfg *cfg = fmt->fmt_config;
	struct wav_fmt *wfmt;
	u16 _bps, _vbps;
	int i;

	dev_dbg(dev, "Endpoint format count=%d\n", fmt->fmt_count);

	for (i = 0; i < fmt->fmt_count; i++) {
	wfmt = &cfg->fmt_ext.fmt;
	_bps = wfmt->bits_per_sample;
	_vbps = cfg->fmt_ext.sample.valid_bits_per_sample;

	dev_dbg(dev, "Endpoint format: ch=%d fmt=%d/%d rate=%d\n",
	wfmt->channels, _vbps, _bps, wfmt->samples_per_sec);

	/*
	* When looking for exact match of configuration ignore the vbps
	* from NHLT table when ignore_vbps is true
	*/
	if (wfmt->channels == num_ch && wfmt->samples_per_sec == rate &&
	(ignore_vbps \|\| vbps == _vbps) && bps == _bps)
	return &cfg->config;

	cfg = (struct nhlt_fmt_cfg *)(cfg->config.caps + cfg->config.size);
	}

	return NULL;
	}

	static bool nhlt_check_ep_match(struct device dev, struct nhlt_endpoint epnt,
	u32 bus_id, u8 link_type, u8 dir, u8 dev_type)
	{
	dev_dbg(dev, "Endpoint: vbus_id=%d link_type=%d dir=%d dev_type = %d\n",
	epnt->virtual_bus_id, epnt->linktype,
	epnt->direction, epnt->device_type);

	if ((epnt->virtual_bus_id != bus_id) \|\|
	(epnt->linktype != link_type) \|\|
	(epnt->direction != dir))
	return false;

	/* link of type DMIC bypasses device_type check */
	return epnt->linktype == NHLT_LINK_DMIC \|\|
	epnt->device_type == dev_type;
	}

	struct nhlt_specific_cfg *
	intel_nhlt_get_endpoint_blob(struct device dev, struct nhlt_acpi_table nhlt,
	u32 bus_id, u8 link_type, u8 vbps, u8 bps,
	u8 num_ch, u32 rate, u8 dir, u8 dev_type)
	{
	struct nhlt_specific_cfg *cfg;
	struct nhlt_endpoint *epnt;
	bool ignore_vbps = false;
	struct nhlt_fmt *fmt;
	int i;

	if (!nhlt)
	return NULL;

	dev_dbg(dev, "Looking for configuration:\n");
	dev_dbg(dev, " vbus_id=%d link_type=%d dir=%d, dev_type=%d\n",
	bus_id, link_type, dir, dev_type);
	if (link_type == NHLT_LINK_DMIC && bps == 32 && (vbps == 24 \|\| vbps == 32)) {
	/*
	* The DMIC hardware supports only one type of 32 bits sample
	* size, which is 24 bit sampling on the MSB side and bits[1:0]
	* are used for indicating the channel number.
	* It has been observed that some NHLT tables have the vbps
	* specified as 32 while some uses 24.
	* The format these variations describe are identical, the
	* hardware is configured and behaves the same way.
	* Note: when the samples assumed to be vbps=32 then the 'noise'
	* introduced by the lower two bits (channel number) have no
	* real life implication on audio quality.
	*/
	dev_dbg(dev,
	" ch=%d fmt=%d rate=%d (vbps is ignored for DMIC 32bit format)\n",
	num_ch, bps, rate);
	ignore_vbps = true;
	} else {
	dev_dbg(dev, " ch=%d fmt=%d/%d rate=%d\n", num_ch, vbps, bps, rate);
	}
	dev_dbg(dev, "Endpoint count=%d\n", nhlt->endpoint_count);

	epnt = (struct nhlt_endpoint *)nhlt->desc;

	for (i = 0; i < nhlt->endpoint_count; i++) {
	if (nhlt_check_ep_match(dev, epnt, bus_id, link_type, dir, dev_type)) {
	fmt = (struct nhlt_fmt *)(epnt->config.caps + epnt->config.size);

	cfg = nhlt_get_specific_cfg(dev, fmt, num_ch, rate,
	vbps, bps, ignore_vbps);
	if (cfg)
	return cfg;
	}

	epnt = (struct nhlt_endpoint )((u8 )epnt + epnt->length);
	}

	return NULL;
	}
	EXPORT_SYMBOL(intel_nhlt_get_endpoint_blob);

	int intel_nhlt_ssp_device_type(struct device dev, struct nhlt_acpi_table nhlt,
	u8 virtual_bus_id)
	{
	struct nhlt_endpoint *epnt;
	int i;

	if (!nhlt)
	return -EINVAL;

	epnt = (struct nhlt_endpoint *)nhlt->desc;
	for (i = 0; i < nhlt->endpoint_count; i++) {
	/* for SSP link the virtual bus id is the SSP port number */
	if (epnt->linktype == NHLT_LINK_SSP &&
	epnt->virtual_bus_id == virtual_bus_id) {
	dev_dbg(dev, "SSP%d: dev_type=%d\n", virtual_bus_id,
	epnt->device_type);
	return epnt->device_type;
	}

	epnt = (struct nhlt_endpoint )((u8 )epnt + epnt->length);
	}

	return -EINVAL;
	}
	EXPORT_SYMBOL(intel_nhlt_ssp_device_type);