1 // SPDX-License-Identifier: GPL-2.0 2 // Copyright (c) 2015-2019 Intel Corporation 3 4 #include <linux/acpi.h> 5 #include <sound/intel-nhlt.h> 6 7 #define NHLT_ACPI_HEADER_SIG "NHLT" 8 9 /* Unique identification for getting NHLT blobs */ 10 static guid_t osc_guid = 11 GUID_INIT(0xA69F886E, 0x6CEB, 0x4594, 12 0xA4, 0x1F, 0x7B, 0x5D, 0xCE, 0x24, 0xC5, 0x53); 13 14 struct nhlt_acpi_table *intel_nhlt_init(struct device *dev) 15 { 16 acpi_handle handle; 17 union acpi_object *obj; 18 struct nhlt_resource_desc *nhlt_ptr; 19 struct nhlt_acpi_table *nhlt_table = NULL; 20 21 handle = ACPI_HANDLE(dev); 22 if (!handle) { 23 dev_err(dev, "Didn't find ACPI_HANDLE\n"); 24 return NULL; 25 } 26 27 obj = acpi_evaluate_dsm(handle, &osc_guid, 1, 1, NULL); 28 29 if (!obj) 30 return NULL; 31 32 if (obj->type != ACPI_TYPE_BUFFER) { 33 dev_dbg(dev, "No NHLT table found\n"); 34 ACPI_FREE(obj); 35 return NULL; 36 } 37 38 nhlt_ptr = (struct nhlt_resource_desc *)obj->buffer.pointer; 39 if (nhlt_ptr->length) 40 nhlt_table = (struct nhlt_acpi_table *) 41 memremap(nhlt_ptr->min_addr, nhlt_ptr->length, 42 MEMREMAP_WB); 43 ACPI_FREE(obj); 44 if (nhlt_table && 45 (strncmp(nhlt_table->header.signature, 46 NHLT_ACPI_HEADER_SIG, 47 strlen(NHLT_ACPI_HEADER_SIG)) != 0)) { 48 memunmap(nhlt_table); 49 dev_err(dev, "NHLT ACPI header signature incorrect\n"); 50 return NULL; 51 } 52 return nhlt_table; 53 } 54 EXPORT_SYMBOL_GPL(intel_nhlt_init); 55 56 void intel_nhlt_free(struct nhlt_acpi_table *nhlt) 57 { 58 memunmap((void *)nhlt); 59 } 60 EXPORT_SYMBOL_GPL(intel_nhlt_free); 61 62 int intel_nhlt_get_dmic_geo(struct device *dev, struct nhlt_acpi_table *nhlt) 63 { 64 struct nhlt_endpoint *epnt; 65 struct nhlt_dmic_array_config *cfg; 66 struct nhlt_vendor_dmic_array_config *cfg_vendor; 67 unsigned int dmic_geo = 0; 68 u8 j; 69 70 if (!nhlt) 71 return 0; 72 73 epnt = (struct nhlt_endpoint *)nhlt->desc; 74 75 for (j = 0; j < nhlt->endpoint_count; j++) { 76 if (epnt->linktype == NHLT_LINK_DMIC) { 77 cfg = (struct nhlt_dmic_array_config *) 78 (epnt->config.caps); 79 switch (cfg->array_type) { 80 case NHLT_MIC_ARRAY_2CH_SMALL: 81 case NHLT_MIC_ARRAY_2CH_BIG: 82 dmic_geo = MIC_ARRAY_2CH; 83 break; 84 85 case NHLT_MIC_ARRAY_4CH_1ST_GEOM: 86 case NHLT_MIC_ARRAY_4CH_L_SHAPED: 87 case NHLT_MIC_ARRAY_4CH_2ND_GEOM: 88 dmic_geo = MIC_ARRAY_4CH; 89 break; 90 case NHLT_MIC_ARRAY_VENDOR_DEFINED: 91 cfg_vendor = (struct nhlt_vendor_dmic_array_config *)cfg; 92 dmic_geo = cfg_vendor->nb_mics; 93 break; 94 default: 95 dev_warn(dev, "undefined DMIC array_type 0x%0x\n", 96 cfg->array_type); 97 } 98 } 99 epnt = (struct nhlt_endpoint *)((u8 *)epnt + epnt->length); 100 } 101 102 return dmic_geo; 103 } 104 EXPORT_SYMBOL_GPL(intel_nhlt_get_dmic_geo); 105