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// 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;
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) {
dev_dbg(dev, "%s: found %d format definitions\n",
__func__, fmt_configs->fmt_count);
for (i = 0; i < fmt_configs->fmt_count; i++) {
struct wav_fmt_ext *fmt_ext;
fmt_ext = &fmt_configs->fmt_config[i].fmt_ext;
if (fmt_ext->fmt.channels > max_ch)
max_ch = fmt_ext->fmt.channels;
}
dev_dbg(dev, "%s: max channels found %d\n", __func__, max_ch);
} else {
dev_dbg(dev, "%s: No format information found\n", __func__);
}
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, "%s: Array with %d dmics\n", __func__, dmic_geo);
}
if (max_ch > dmic_geo) {
dev_dbg(dev, "%s: max channels %d exceed dmic number %d\n",
__func__, max_ch, dmic_geo);
}
}
}
dev_dbg(dev, "%s: dmic number %d max_ch %d\n",
__func__, dmic_geo, max_ch);
return dmic_geo;
}
EXPORT_SYMBOL_GPL(intel_nhlt_get_dmic_geo);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("Intel NHLT driver");
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