1 files changed, 103 insertions, 0 deletions
diff --git a/sound/hda/intel-nhlt.c b/sound/hda/intel-nhlt.c
new file mode 100644
index 000000000000..7a62e03ba407
--- /dev/null
+++ b/sound/hda/intel-nhlt.c
@@ -0,0 +1,103 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (c) 2015-2019 Intel Corporation
+
+#include <linux/acpi.h>
+#include <sound/intel-nhlt.h>
+
+#define NHLT_ACPI_HEADER_SIG	"NHLT"
+
+/* Unique identification for getting NHLT blobs */
+static guid_t osc_guid =
+	GUID_INIT(0xA69F886E, 0x6CEB, 0x4594,
+		  0xA4, 0x1F, 0x7B, 0x5D, 0xCE, 0x24, 0xC5, 0x53);
+
+struct nhlt_acpi_table *intel_nhlt_init(struct device *dev)
+{
+	acpi_handle handle;
+	union acpi_object *obj;
+	struct nhlt_resource_desc *nhlt_ptr;
+	struct nhlt_acpi_table *nhlt_table = NULL;
+
+	handle = ACPI_HANDLE(dev);
+	if (!handle) {
+		dev_err(dev, "Didn't find ACPI_HANDLE\n");
+		return NULL;
+	}
+
+	obj = acpi_evaluate_dsm(handle, &osc_guid, 1, 1, NULL);
+
+	if (!obj)
+		return NULL;
+
+	if (obj->type != ACPI_TYPE_BUFFER) {
+		dev_dbg(dev, "No NHLT table found\n");
+		ACPI_FREE(obj);
+		return NULL;
+	}
+
+	nhlt_ptr = (struct nhlt_resource_desc  *)obj->buffer.pointer;
+	if (nhlt_ptr->length)
+		nhlt_table = (struct nhlt_acpi_table *)
+			memremap(nhlt_ptr->min_addr, nhlt_ptr->length,
+				 MEMREMAP_WB);
+	ACPI_FREE(obj);
+	if (nhlt_table &&
+	    (strncmp(nhlt_table->header.signature,
+		     NHLT_ACPI_HEADER_SIG,
+		     strlen(NHLT_ACPI_HEADER_SIG)) != 0)) {
+		memunmap(nhlt_table);
+		dev_err(dev, "NHLT ACPI header signature incorrect\n");
+		return NULL;
+	}
+	return nhlt_table;
+}
+EXPORT_SYMBOL_GPL(intel_nhlt_init);
+
+void intel_nhlt_free(struct nhlt_acpi_table *nhlt)
+{
+	memunmap((void *)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;
+	unsigned int dmic_geo = 0;
+	u8 j;
+
+	if (!nhlt)
+		return 0;
+
+	epnt = (struct nhlt_endpoint *)nhlt->desc;
+
+	for (j = 0; j < nhlt->endpoint_count; j++) {
+		if (epnt->linktype == NHLT_LINK_DMIC) {
+			cfg = (struct nhlt_dmic_array_config  *)
+					(epnt->config.caps);
+			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;
+
+			default:
+				dev_warn(dev, "undefined DMIC array_type 0x%0x\n",
+					 cfg->array_type);
+			}
+		}
+		epnt = (struct nhlt_endpoint *)((u8 *)epnt + epnt->length);
+	}
+
+	return dmic_geo;
+}
+EXPORT_SYMBOL_GPL(intel_nhlt_get_dmic_geo);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("Intel NHLT driver");