sound/hda/intel-nhlt.c

   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);