1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright(c) 2023-2024 Intel Corporation
4 *
5 * Authors: Cezary Rojewski <cezary.rojewski@intel.com>
6 * Amadeusz Slawinski <amadeuszx.slawinski@linux.intel.com>
7 */
8
9#define pr_fmt(fmt) "ACPI: NHLT: " fmt
10
11#include <linux/acpi.h>
12#include <linux/errno.h>
13#include <linux/export.h>
14#include <linux/minmax.h>
15#include <linux/printk.h>
16#include <linux/types.h>
17#include <acpi/nhlt.h>
18
19static struct acpi_table_nhlt *acpi_gbl_nhlt;
20
21static struct acpi_table_nhlt empty_nhlt = {
22 .header = {
23 .signature = ACPI_SIG_NHLT,
24 },
25};
26
27/**
28 * acpi_nhlt_get_gbl_table - Retrieve a pointer to the first NHLT table.
29 *
30 * If there is no NHLT in the system, acpi_gbl_nhlt will instead point to an
31 * empty table.
32 *
33 * Return: ACPI status code of the operation.
34 */
35acpi_status acpi_nhlt_get_gbl_table(void)
36{
37 acpi_status status;
38
39 status = acpi_get_table(ACPI_SIG_NHLT, instance: 0, out_table: (struct acpi_table_header **)(&acpi_gbl_nhlt));
40 if (!acpi_gbl_nhlt)
41 acpi_gbl_nhlt = &empty_nhlt;
42 return status;
43}
44EXPORT_SYMBOL_GPL(acpi_nhlt_get_gbl_table);
45
46/**
47 * acpi_nhlt_put_gbl_table - Release the global NHLT table.
48 */
49void acpi_nhlt_put_gbl_table(void)
50{
51 acpi_put_table(table: (struct acpi_table_header *)acpi_gbl_nhlt);
52}
53EXPORT_SYMBOL_GPL(acpi_nhlt_put_gbl_table);
54
55/**
56 * acpi_nhlt_endpoint_match - Verify if an endpoint matches criteria.
57 * @ep: the endpoint to check.
58 * @link_type: the hardware link type, e.g.: PDM or SSP.
59 * @dev_type: the device type.
60 * @dir: stream direction.
61 * @bus_id: the ID of virtual bus hosting the endpoint.
62 *
63 * Either of @link_type, @dev_type, @dir or @bus_id may be set to a negative
64 * value to ignore the parameter when matching.
65 *
66 * Return: %true if endpoint matches specified criteria or %false otherwise.
67 */
68bool acpi_nhlt_endpoint_match(const struct acpi_nhlt_endpoint *ep,
69 int link_type, int dev_type, int dir, int bus_id)
70{
71 return ep &&
72 (link_type < 0 || ep->link_type == link_type) &&
73 (dev_type < 0 || ep->device_type == dev_type) &&
74 (bus_id < 0 || ep->virtual_bus_id == bus_id) &&
75 (dir < 0 || ep->direction == dir);
76}
77EXPORT_SYMBOL_GPL(acpi_nhlt_endpoint_match);
78
79/**
80 * acpi_nhlt_tb_find_endpoint - Search a NHLT table for an endpoint.
81 * @tb: the table to search.
82 * @link_type: the hardware link type, e.g.: PDM or SSP.
83 * @dev_type: the device type.
84 * @dir: stream direction.
85 * @bus_id: the ID of virtual bus hosting the endpoint.
86 *
87 * Either of @link_type, @dev_type, @dir or @bus_id may be set to a negative
88 * value to ignore the parameter during the search.
89 *
90 * Return: A pointer to endpoint matching the criteria, %NULL if not found or
91 * an ERR_PTR() otherwise.
92 */
93struct acpi_nhlt_endpoint *
94acpi_nhlt_tb_find_endpoint(const struct acpi_table_nhlt *tb,
95 int link_type, int dev_type, int dir, int bus_id)
96{
97 struct acpi_nhlt_endpoint *ep;
98
99 for_each_nhlt_endpoint(tb, ep)
100 if (acpi_nhlt_endpoint_match(ep, link_type, dev_type, dir, bus_id))
101 return ep;
102 return NULL;
103}
104EXPORT_SYMBOL_GPL(acpi_nhlt_tb_find_endpoint);
105
106/**
107 * acpi_nhlt_find_endpoint - Search all NHLT tables for an endpoint.
108 * @link_type: the hardware link type, e.g.: PDM or SSP.
109 * @dev_type: the device type.
110 * @dir: stream direction.
111 * @bus_id: the ID of virtual bus hosting the endpoint.
112 *
113 * Either of @link_type, @dev_type, @dir or @bus_id may be set to a negative
114 * value to ignore the parameter during the search.
115 *
116 * Return: A pointer to endpoint matching the criteria, %NULL if not found or
117 * an ERR_PTR() otherwise.
118 */
119struct acpi_nhlt_endpoint *
120acpi_nhlt_find_endpoint(int link_type, int dev_type, int dir, int bus_id)
121{
122 /* TODO: Currently limited to table of index 0. */
123 return acpi_nhlt_tb_find_endpoint(acpi_gbl_nhlt, link_type, dev_type, dir, bus_id);
124}
125EXPORT_SYMBOL_GPL(acpi_nhlt_find_endpoint);
126
127/**
128 * acpi_nhlt_endpoint_find_fmtcfg - Search endpoint's formats configuration space
129 * for a specific format.
130 * @ep: the endpoint to search.
131 * @ch: number of channels.
132 * @rate: samples per second.
133 * @vbps: valid bits per sample.
134 * @bps: bits per sample.
135 *
136 * Return: A pointer to format matching the criteria, %NULL if not found or
137 * an ERR_PTR() otherwise.
138 */
139struct acpi_nhlt_format_config *
140acpi_nhlt_endpoint_find_fmtcfg(const struct acpi_nhlt_endpoint *ep,
141 u16 ch, u32 rate, u16 vbps, u16 bps)
142{
143 struct acpi_nhlt_wave_formatext *wav;
144 struct acpi_nhlt_format_config *fmt;
145
146 for_each_nhlt_endpoint_fmtcfg(ep, fmt) {
147 wav = &fmt->format;
148
149 if (wav->valid_bits_per_sample == vbps &&
150 wav->samples_per_sec == rate &&
151 wav->bits_per_sample == bps &&
152 wav->channel_count == ch)
153 return fmt;
154 }
155
156 return NULL;
157}
158EXPORT_SYMBOL_GPL(acpi_nhlt_endpoint_find_fmtcfg);
159
160/**
161 * acpi_nhlt_tb_find_fmtcfg - Search a NHLT table for a specific format.
162 * @tb: the table to search.
163 * @link_type: the hardware link type, e.g.: PDM or SSP.
164 * @dev_type: the device type.
165 * @dir: stream direction.
166 * @bus_id: the ID of virtual bus hosting the endpoint.
167 *
168 * @ch: number of channels.
169 * @rate: samples per second.
170 * @vbps: valid bits per sample.
171 * @bps: bits per sample.
172 *
173 * Either of @link_type, @dev_type, @dir or @bus_id may be set to a negative
174 * value to ignore the parameter during the search.
175 *
176 * Return: A pointer to format matching the criteria, %NULL if not found or
177 * an ERR_PTR() otherwise.
178 */
179struct acpi_nhlt_format_config *
180acpi_nhlt_tb_find_fmtcfg(const struct acpi_table_nhlt *tb,
181 int link_type, int dev_type, int dir, int bus_id,
182 u16 ch, u32 rate, u16 vbps, u16 bps)
183{
184 struct acpi_nhlt_format_config *fmt;
185 struct acpi_nhlt_endpoint *ep;
186
187 for_each_nhlt_endpoint(tb, ep) {
188 if (!acpi_nhlt_endpoint_match(ep, link_type, dev_type, dir, bus_id))
189 continue;
190
191 fmt = acpi_nhlt_endpoint_find_fmtcfg(ep, ch, rate, vbps, bps);
192 if (fmt)
193 return fmt;
194 }
195
196 return NULL;
197}
198EXPORT_SYMBOL_GPL(acpi_nhlt_tb_find_fmtcfg);
199
200/**
201 * acpi_nhlt_find_fmtcfg - Search all NHLT tables for a specific format.
202 * @link_type: the hardware link type, e.g.: PDM or SSP.
203 * @dev_type: the device type.
204 * @dir: stream direction.
205 * @bus_id: the ID of virtual bus hosting the endpoint.
206 *
207 * @ch: number of channels.
208 * @rate: samples per second.
209 * @vbps: valid bits per sample.
210 * @bps: bits per sample.
211 *
212 * Either of @link_type, @dev_type, @dir or @bus_id may be set to a negative
213 * value to ignore the parameter during the search.
214 *
215 * Return: A pointer to format matching the criteria, %NULL if not found or
216 * an ERR_PTR() otherwise.
217 */
218struct acpi_nhlt_format_config *
219acpi_nhlt_find_fmtcfg(int link_type, int dev_type, int dir, int bus_id,
220 u16 ch, u32 rate, u16 vbps, u16 bps)
221{
222 /* TODO: Currently limited to table of index 0. */
223 return acpi_nhlt_tb_find_fmtcfg(acpi_gbl_nhlt, link_type, dev_type, dir, bus_id,
224 ch, rate, vbps, bps);
225}
226EXPORT_SYMBOL_GPL(acpi_nhlt_find_fmtcfg);
227
228static bool acpi_nhlt_config_is_micdevice(struct acpi_nhlt_config *cfg)
229{
230 return cfg->capabilities_size >= sizeof(struct acpi_nhlt_micdevice_config);
231}
232
233static bool acpi_nhlt_config_is_vendor_micdevice(struct acpi_nhlt_config *cfg)
234{
235 struct acpi_nhlt_vendor_micdevice_config *devcfg = __acpi_nhlt_config_caps(cfg);
236
237 return cfg->capabilities_size >= sizeof(*devcfg) &&
238 cfg->capabilities_size == struct_size(devcfg, mics, devcfg->mics_count);
239}
240
241/**
242 * acpi_nhlt_endpoint_mic_count - Retrieve number of digital microphones for a PDM endpoint.
243 * @ep: the endpoint to return microphones count for.
244 *
245 * Return: A number of microphones or an error code if an invalid endpoint is provided.
246 */
247int acpi_nhlt_endpoint_mic_count(const struct acpi_nhlt_endpoint *ep)
248{
249 union acpi_nhlt_device_config *devcfg;
250 struct acpi_nhlt_format_config *fmt;
251 struct acpi_nhlt_config *cfg;
252 u16 max_ch = 0;
253
254 if (!ep || ep->link_type != ACPI_NHLT_LINKTYPE_PDM)
255 return -EINVAL;
256
257 /* Find max number of channels based on formats configuration. */
258 for_each_nhlt_endpoint_fmtcfg(ep, fmt)
259 max_ch = max(fmt->format.channel_count, max_ch);
260
261 cfg = __acpi_nhlt_endpoint_config(ep);
262 devcfg = __acpi_nhlt_config_caps(cfg);
263
264 /* If @ep is not a mic array, fallback to channels count. */
265 if (!acpi_nhlt_config_is_micdevice(cfg) ||
266 devcfg->gen.config_type != ACPI_NHLT_CONFIGTYPE_MICARRAY)
267 return max_ch;
268
269 switch (devcfg->mic.array_type) {
270 case ACPI_NHLT_ARRAYTYPE_LINEAR2_SMALL:
271 case ACPI_NHLT_ARRAYTYPE_LINEAR2_BIG:
272 return 2;
273
274 case ACPI_NHLT_ARRAYTYPE_LINEAR4_GEO1:
275 case ACPI_NHLT_ARRAYTYPE_PLANAR4_LSHAPED:
276 case ACPI_NHLT_ARRAYTYPE_LINEAR4_GEO2:
277 return 4;
278
279 case ACPI_NHLT_ARRAYTYPE_VENDOR:
280 if (!acpi_nhlt_config_is_vendor_micdevice(cfg))
281 return -EINVAL;
282 return devcfg->vendor_mic.mics_count;
283
284 default:
285 pr_warn("undefined mic array type: %#x\n", devcfg->mic.array_type);
286 return max_ch;
287 }
288}
289EXPORT_SYMBOL_GPL(acpi_nhlt_endpoint_mic_count);
290

source code of linux/drivers/acpi/nhlt.c