intel-nhlt.c
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// 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;
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;
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, "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);