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
intel_nhlt_init(struct device * dev)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
intel_nhlt_free(struct nhlt_acpi_table * nhlt)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
intel_nhlt_get_dmic_geo(struct device * dev,struct nhlt_acpi_table * nhlt)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