149 lines
3.8 KiB
C
149 lines
3.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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// Copyright (c) 2015-2019 Intel Corporation
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#include <linux/acpi.h>
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#include <sound/intel-nhlt.h>
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#define NHLT_ACPI_HEADER_SIG "NHLT"
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/* Unique identification for getting NHLT blobs */
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static guid_t osc_guid =
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GUID_INIT(0xA69F886E, 0x6CEB, 0x4594,
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0xA4, 0x1F, 0x7B, 0x5D, 0xCE, 0x24, 0xC5, 0x53);
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struct nhlt_acpi_table *intel_nhlt_init(struct device *dev)
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{
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acpi_handle handle;
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union acpi_object *obj;
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struct nhlt_resource_desc *nhlt_ptr;
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struct nhlt_acpi_table *nhlt_table = NULL;
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handle = ACPI_HANDLE(dev);
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if (!handle) {
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dev_err(dev, "Didn't find ACPI_HANDLE\n");
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return NULL;
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}
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obj = acpi_evaluate_dsm(handle, &osc_guid, 1, 1, NULL);
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if (!obj)
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return NULL;
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if (obj->type != ACPI_TYPE_BUFFER) {
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dev_dbg(dev, "No NHLT table found\n");
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ACPI_FREE(obj);
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return NULL;
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}
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nhlt_ptr = (struct nhlt_resource_desc *)obj->buffer.pointer;
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if (nhlt_ptr->length)
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nhlt_table = (struct nhlt_acpi_table *)
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memremap(nhlt_ptr->min_addr, nhlt_ptr->length,
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MEMREMAP_WB);
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ACPI_FREE(obj);
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if (nhlt_table &&
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(strncmp(nhlt_table->header.signature,
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NHLT_ACPI_HEADER_SIG,
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strlen(NHLT_ACPI_HEADER_SIG)) != 0)) {
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memunmap(nhlt_table);
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dev_err(dev, "NHLT ACPI header signature incorrect\n");
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return NULL;
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}
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return nhlt_table;
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}
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EXPORT_SYMBOL_GPL(intel_nhlt_init);
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void intel_nhlt_free(struct nhlt_acpi_table *nhlt)
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{
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memunmap((void *)nhlt);
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}
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EXPORT_SYMBOL_GPL(intel_nhlt_free);
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int intel_nhlt_get_dmic_geo(struct device *dev, struct nhlt_acpi_table *nhlt)
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{
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struct nhlt_endpoint *epnt;
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struct nhlt_dmic_array_config *cfg;
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struct nhlt_vendor_dmic_array_config *cfg_vendor;
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struct nhlt_fmt *fmt_configs;
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unsigned int dmic_geo = 0;
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u16 max_ch = 0;
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u8 i, j;
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if (!nhlt)
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return 0;
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if (nhlt->header.length <= sizeof(struct acpi_table_header)) {
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dev_warn(dev, "Invalid DMIC description table\n");
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return 0;
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}
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for (j = 0, epnt = nhlt->desc; j < nhlt->endpoint_count; j++,
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epnt = (struct nhlt_endpoint *)((u8 *)epnt + epnt->length)) {
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if (epnt->linktype != NHLT_LINK_DMIC)
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continue;
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cfg = (struct nhlt_dmic_array_config *)(epnt->config.caps);
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fmt_configs = (struct nhlt_fmt *)(epnt->config.caps + epnt->config.size);
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/* find max number of channels based on format_configuration */
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if (fmt_configs->fmt_count) {
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dev_dbg(dev, "%s: found %d format definitions\n",
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__func__, fmt_configs->fmt_count);
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for (i = 0; i < fmt_configs->fmt_count; i++) {
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struct wav_fmt_ext *fmt_ext;
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fmt_ext = &fmt_configs->fmt_config[i].fmt_ext;
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if (fmt_ext->fmt.channels > max_ch)
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max_ch = fmt_ext->fmt.channels;
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}
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dev_dbg(dev, "%s: max channels found %d\n", __func__, max_ch);
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} else {
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dev_dbg(dev, "%s: No format information found\n", __func__);
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}
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if (cfg->device_config.config_type != NHLT_CONFIG_TYPE_MIC_ARRAY) {
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dmic_geo = max_ch;
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} else {
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switch (cfg->array_type) {
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case NHLT_MIC_ARRAY_2CH_SMALL:
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case NHLT_MIC_ARRAY_2CH_BIG:
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dmic_geo = MIC_ARRAY_2CH;
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break;
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case NHLT_MIC_ARRAY_4CH_1ST_GEOM:
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case NHLT_MIC_ARRAY_4CH_L_SHAPED:
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case NHLT_MIC_ARRAY_4CH_2ND_GEOM:
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dmic_geo = MIC_ARRAY_4CH;
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break;
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case NHLT_MIC_ARRAY_VENDOR_DEFINED:
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cfg_vendor = (struct nhlt_vendor_dmic_array_config *)cfg;
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dmic_geo = cfg_vendor->nb_mics;
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break;
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default:
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dev_warn(dev, "%s: undefined DMIC array_type 0x%0x\n",
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__func__, cfg->array_type);
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}
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if (dmic_geo > 0) {
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dev_dbg(dev, "%s: Array with %d dmics\n", __func__, dmic_geo);
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}
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if (max_ch > dmic_geo) {
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dev_dbg(dev, "%s: max channels %d exceed dmic number %d\n",
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__func__, max_ch, dmic_geo);
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}
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}
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}
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dev_dbg(dev, "%s: dmic number %d max_ch %d\n",
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__func__, dmic_geo, max_ch);
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return dmic_geo;
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}
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EXPORT_SYMBOL_GPL(intel_nhlt_get_dmic_geo);
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MODULE_LICENSE("GPL v2");
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MODULE_DESCRIPTION("Intel NHLT driver");
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