1 // SPDX-License-Identifier: GPL-2.0-only 2 // Copyright (c) 2015-2019 Intel Corporation 3 4 #include <linux/acpi.h> 5 #include <sound/intel-nhlt.h> 6 7 struct nhlt_acpi_table *intel_nhlt_init(struct device *dev) 8 { 9 struct nhlt_acpi_table *nhlt; 10 acpi_status status; 11 12 status = acpi_get_table(ACPI_SIG_NHLT, 0, 13 (struct acpi_table_header **)&nhlt); 14 if (ACPI_FAILURE(status)) { 15 dev_warn(dev, "NHLT table not found\n"); 16 return NULL; 17 } 18 19 return nhlt; 20 } 21 EXPORT_SYMBOL_GPL(intel_nhlt_init); 22 23 void intel_nhlt_free(struct nhlt_acpi_table *nhlt) 24 { 25 acpi_put_table((struct acpi_table_header *)nhlt); 26 } 27 EXPORT_SYMBOL_GPL(intel_nhlt_free); 28 29 int intel_nhlt_get_dmic_geo(struct device *dev, struct nhlt_acpi_table *nhlt) 30 { 31 struct nhlt_endpoint *epnt; 32 struct nhlt_dmic_array_config *cfg; 33 struct nhlt_vendor_dmic_array_config *cfg_vendor; 34 struct nhlt_fmt *fmt_configs; 35 unsigned int dmic_geo = 0; 36 u16 max_ch = 0; 37 u8 i, j; 38 39 if (!nhlt) 40 return 0; 41 42 if (nhlt->header.length <= sizeof(struct acpi_table_header)) { 43 dev_warn(dev, "Invalid DMIC description table\n"); 44 return 0; 45 } 46 47 for (j = 0, epnt = nhlt->desc; j < nhlt->endpoint_count; j++, 48 epnt = (struct nhlt_endpoint *)((u8 *)epnt + epnt->length)) { 49 50 if (epnt->linktype != NHLT_LINK_DMIC) 51 continue; 52 53 cfg = (struct nhlt_dmic_array_config *)(epnt->config.caps); 54 fmt_configs = (struct nhlt_fmt *)(epnt->config.caps + epnt->config.size); 55 56 /* find max number of channels based on format_configuration */ 57 if (fmt_configs->fmt_count) { 58 struct nhlt_fmt_cfg *fmt_cfg = fmt_configs->fmt_config; 59 60 dev_dbg(dev, "found %d format definitions\n", 61 fmt_configs->fmt_count); 62 63 for (i = 0; i < fmt_configs->fmt_count; i++) { 64 struct wav_fmt_ext *fmt_ext; 65 66 fmt_ext = &fmt_cfg->fmt_ext; 67 68 if (fmt_ext->fmt.channels > max_ch) 69 max_ch = fmt_ext->fmt.channels; 70 71 /* Move to the next nhlt_fmt_cfg */ 72 fmt_cfg = (struct nhlt_fmt_cfg *)(fmt_cfg->config.caps + 73 fmt_cfg->config.size); 74 } 75 dev_dbg(dev, "max channels found %d\n", max_ch); 76 } else { 77 dev_dbg(dev, "No format information found\n"); 78 } 79 80 if (cfg->device_config.config_type != NHLT_CONFIG_TYPE_MIC_ARRAY) { 81 dmic_geo = max_ch; 82 } else { 83 switch (cfg->array_type) { 84 case NHLT_MIC_ARRAY_2CH_SMALL: 85 case NHLT_MIC_ARRAY_2CH_BIG: 86 dmic_geo = MIC_ARRAY_2CH; 87 break; 88 89 case NHLT_MIC_ARRAY_4CH_1ST_GEOM: 90 case NHLT_MIC_ARRAY_4CH_L_SHAPED: 91 case NHLT_MIC_ARRAY_4CH_2ND_GEOM: 92 dmic_geo = MIC_ARRAY_4CH; 93 break; 94 case NHLT_MIC_ARRAY_VENDOR_DEFINED: 95 cfg_vendor = (struct nhlt_vendor_dmic_array_config *)cfg; 96 dmic_geo = cfg_vendor->nb_mics; 97 break; 98 default: 99 dev_warn(dev, "%s: undefined DMIC array_type 0x%0x\n", 100 __func__, cfg->array_type); 101 } 102 103 if (dmic_geo > 0) { 104 dev_dbg(dev, "Array with %d dmics\n", dmic_geo); 105 } 106 if (max_ch > dmic_geo) { 107 dev_dbg(dev, "max channels %d exceed dmic number %d\n", 108 max_ch, dmic_geo); 109 } 110 } 111 } 112 113 dev_dbg(dev, "dmic number %d max_ch %d\n", dmic_geo, max_ch); 114 115 return dmic_geo; 116 } 117 EXPORT_SYMBOL_GPL(intel_nhlt_get_dmic_geo); 118