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
intel_nhlt_init(struct device * dev)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
intel_nhlt_free(struct nhlt_acpi_table * nhlt)56 void intel_nhlt_free(struct nhlt_acpi_table *nhlt)
57 {
58 memunmap((void *)nhlt);
59 }
60 EXPORT_SYMBOL_GPL(intel_nhlt_free);
61
intel_nhlt_get_dmic_geo(struct device * dev,struct nhlt_acpi_table * nhlt)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 struct nhlt_fmt *fmt_configs;
68 unsigned int dmic_geo = 0;
69 u16 max_ch = 0;
70 u8 i, j;
71
72 if (!nhlt)
73 return 0;
74
75 if (nhlt->header.length <= sizeof(struct acpi_table_header)) {
76 dev_warn(dev, "Invalid DMIC description table\n");
77 return 0;
78 }
79
80 for (j = 0, epnt = nhlt->desc; j < nhlt->endpoint_count; j++,
81 epnt = (struct nhlt_endpoint *)((u8 *)epnt + epnt->length)) {
82
83 if (epnt->linktype != NHLT_LINK_DMIC)
84 continue;
85
86 cfg = (struct nhlt_dmic_array_config *)(epnt->config.caps);
87 fmt_configs = (struct nhlt_fmt *)(epnt->config.caps + epnt->config.size);
88
89 /* find max number of channels based on format_configuration */
90 if (fmt_configs->fmt_count) {
91 dev_dbg(dev, "%s: found %d format definitions\n",
92 __func__, fmt_configs->fmt_count);
93
94 for (i = 0; i < fmt_configs->fmt_count; i++) {
95 struct wav_fmt_ext *fmt_ext;
96
97 fmt_ext = &fmt_configs->fmt_config[i].fmt_ext;
98
99 if (fmt_ext->fmt.channels > max_ch)
100 max_ch = fmt_ext->fmt.channels;
101 }
102 dev_dbg(dev, "%s: max channels found %d\n", __func__, max_ch);
103 } else {
104 dev_dbg(dev, "%s: No format information found\n", __func__);
105 }
106
107 if (cfg->device_config.config_type != NHLT_CONFIG_TYPE_MIC_ARRAY) {
108 dmic_geo = max_ch;
109 } else {
110 switch (cfg->array_type) {
111 case NHLT_MIC_ARRAY_2CH_SMALL:
112 case NHLT_MIC_ARRAY_2CH_BIG:
113 dmic_geo = MIC_ARRAY_2CH;
114 break;
115
116 case NHLT_MIC_ARRAY_4CH_1ST_GEOM:
117 case NHLT_MIC_ARRAY_4CH_L_SHAPED:
118 case NHLT_MIC_ARRAY_4CH_2ND_GEOM:
119 dmic_geo = MIC_ARRAY_4CH;
120 break;
121 case NHLT_MIC_ARRAY_VENDOR_DEFINED:
122 cfg_vendor = (struct nhlt_vendor_dmic_array_config *)cfg;
123 dmic_geo = cfg_vendor->nb_mics;
124 break;
125 default:
126 dev_warn(dev, "%s: undefined DMIC array_type 0x%0x\n",
127 __func__, cfg->array_type);
128 }
129
130 if (dmic_geo > 0) {
131 dev_dbg(dev, "%s: Array with %d dmics\n", __func__, dmic_geo);
132 }
133 if (max_ch > dmic_geo) {
134 dev_dbg(dev, "%s: max channels %d exceed dmic number %d\n",
135 __func__, max_ch, dmic_geo);
136 }
137 }
138 }
139
140 dev_dbg(dev, "%s: dmic number %d max_ch %d\n",
141 __func__, dmic_geo, max_ch);
142
143 return dmic_geo;
144 }
145 EXPORT_SYMBOL_GPL(intel_nhlt_get_dmic_geo);
146
147 MODULE_LICENSE("GPL v2");
148 MODULE_DESCRIPTION("Intel NHLT driver");
149