1 files changed, 117 insertions, 0 deletions
diff --git a/sound/hda/intel-nhlt.c b/sound/hda/intel-nhlt.c
new file mode 100644
index 000000000..8714891f5
--- /dev/null
+++ b/sound/hda/intel-nhlt.c
@@ -0,0 +1,117 @@
+// 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);