mirror of https://gitee.com/openkylin/linux.git
108 lines
2.6 KiB
C
108 lines
2.6 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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unsigned int dmic_geo = 0;
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u8 j;
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if (!nhlt)
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return 0;
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epnt = (struct nhlt_endpoint *)nhlt->desc;
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for (j = 0; j < nhlt->endpoint_count; j++) {
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if (epnt->linktype == NHLT_LINK_DMIC) {
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cfg = (struct nhlt_dmic_array_config *)
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(epnt->config.caps);
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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, "undefined DMIC array_type 0x%0x\n",
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cfg->array_type);
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}
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}
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epnt = (struct nhlt_endpoint *)((u8 *)epnt + epnt->length);
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}
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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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