ALSA: hda: Fill gaps in NHLT endpoint-interface

Two key operations missings are: endpoint presence-check and retrieval
of matching endpoint hardware configuration (blob). Add operations for
both use cases.

Signed-off-by: Amadeusz Sławiński <amadeuszx.slawinski@linux.intel.com>
Signed-off-by: Cezary Rojewski <cezary.rojewski@intel.com>

include/sound/intel-nhlt.h

@@ -132,6 +132,12 @@ void intel_nhlt_free(struct acpi_table_nhlt *addr);
 
 int intel_nhlt_get_dmic_geo(struct acpi_table_nhlt *nhlt);
 
+bool intel_nhlt_has_endpoint_type(struct acpi_table_nhlt *nhlt, u8 link_type);
+struct nhlt_specific_cfg *
+intel_nhlt_get_endpoint_blob(struct acpi_table_nhlt *nhlt,
+			     u32 bus_id, u8 link_type, u8 vbps, u8 bps,
+			     u8 num_ch, u32 rate, u8 dir, u8 dev_type);
+
 #else
 
 struct acpi_table_nhlt;
@@ -149,6 +155,20 @@ static inline int intel_nhlt_get_dmic_geo(struct acpi_table_nhlt *nhlt)
 {
 	return 0;
 }
+
+bool intel_nhlt_has_endpoint_type(struct acpi_table_nhlt *nhlt, u8 link_type)
+{
+	return false;
+}
+
+struct nhlt_specific_cfg *
+intel_nhlt_get_endpoint_blob(struct acpi_table_nhlt *nhlt,
+			     u32 bus_id, u8 link_type, u8 vbps, u8 bps,
+			     u8 num_ch, u32 rate, u8 dir, u8 dev_type)
+{
+	return NULL;
+}
+
 #endif
 
 #endif

sound/hda/intel-nhlt.c

@@ -112,3 +112,102 @@ int intel_nhlt_get_dmic_geo(struct acpi_table_nhlt *nhlt)
 	return dmic_geo;
 }
 EXPORT_SYMBOL_GPL(intel_nhlt_get_dmic_geo);
+
+bool intel_nhlt_has_endpoint_type(struct acpi_table_nhlt *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);
+
+static struct nhlt_specific_cfg *
+nhlt_get_specific_cfg(struct nhlt_fmt *fmt, u8 num_ch, u32 rate, u8 vbps, u8 bps)
+{
+	struct nhlt_fmt_cfg *cfg = fmt->fmt_config;
+	struct wav_fmt *wfmt;
+	u16 _bps, _vbps;
+	int i;
+
+	pr_debug("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;
+
+		pr_debug("Endpoint format: ch=%d fmt=%d/%d rate=%d\n",
+			 wfmt->channels, _vbps, _bps, wfmt->samples_per_sec);
+
+		if (wfmt->channels == num_ch && wfmt->samples_per_sec == rate &&
+		    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 nhlt_endpoint *epnt,
+				u32 bus_id, u8 link_type, u8 dir, u8 dev_type)
+{
+	pr_debug("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 acpi_table_nhlt *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;
+	struct nhlt_fmt *fmt;
+	int i;
+
+	if (!nhlt)
+		return NULL;
+
+	pr_debug("Looking for configuration:\n");
+	pr_debug("  vbus_id=%d link_type=%d dir=%d, dev_type=%d\n",
+		 bus_id, link_type, dir, dev_type);
+	pr_debug("  ch=%d fmt=%d/%d rate=%d\n", num_ch, vbps, bps, rate);
+	pr_debug("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(epnt, bus_id, link_type, dir, dev_type)) {
+			fmt = (struct nhlt_fmt *)(epnt->config.caps + epnt->config.size);
+			cfg = nhlt_get_specific_cfg(fmt, num_ch, rate, vbps, bps);
+			if (cfg)
+				return cfg;
+		}
+
+		epnt = (struct nhlt_endpoint *)((u8 *)epnt + epnt->length);
+	}
+
+	return NULL;
+}
+EXPORT_SYMBOL(intel_nhlt_get_endpoint_blob);