alsa-utils/nhlt/nhlt-dmic-info.c

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/*
* Extract microphone configuration from the ACPI NHLT table
*
* Specification:
* https://01.org/sites/default/files/595976_intel_sst_nhlt.pdf
*
* Author: Jaroslav Kysela <perex@perex.cz>
*
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <getopt.h>
#include <sys/stat.h>
#include <arpa/inet.h>
int debug = 0;
/*
* Dump dmic parameters in json
*/
#define ACPI_HDR_SIZE (4 + 4 + 1 + 1 + 6 + 8 + 4 + 4 + 4)
#define NHLT_EP_HDR_SIZE (4 + 1 + 1 + 2 + 2 + 2 + 4 + 1 + 1 + 1)
#define VENDOR_MIC_CFG_SIZE (1 + 1 + 2 + 2 + 2 + 1 + 1 + 2 + 2 + 2 + 2 + 2 + 2)
static const char *microphone_type(u_int8_t type)
{
switch (type) {
case 0: return "omnidirectional";
case 1: return "subcardoid";
case 2: return "cardoid";
case 3: return "supercardoid";
case 4: return "hypercardoid";
case 5: return "8shaped";
case 7: return "vendor";
}
return "unknown";
}
static const char *microphone_location(u_int8_t location)
{
switch (location) {
case 0: return "laptop-top-panel";
case 1: return "laptop-bottom-panel";
case 2: return "laptop-left-panel";
case 3: return "laptop-right-panel";
case 4: return "laptop-front-panel";
case 5: return "laptop-rear-panel";
}
return "unknown";
}
static inline u_int8_t get_u8(u_int8_t *base, u_int32_t off)
{
return *(base + off);
}
static inline int32_t get_s16le(u_int8_t *base, u_int32_t off)
{
u_int32_t v = *(base + off + 0) |
(*(base + off + 1) << 8);
if (v & 0x8000)
return -((int32_t)0x10000 - (int32_t)v);
return v;
}
static inline u_int32_t get_u32le(u_int8_t *base, u_int32_t off)
{
return *(base + off + 0) |
(*(base + off + 1) << 8) |
(*(base + off + 2) << 16) |
(*(base + off + 3) << 24);
}
static int nhlt_dmic_config(FILE *out, uint8_t *dmic, uint8_t mic)
{
int32_t angle_begin, angle_end;
if (mic > 0)
fprintf(out, ",\n");
fprintf(out, "\t\t{\n");
fprintf(out, "\t\t\t\"channel\":%i,\n", mic);
fprintf(out, "\t\t\t\"type\":\"%s\",\n", microphone_type(get_u8(dmic, 0)));
fprintf(out, "\t\t\t\"location\":\"%s\"", microphone_location(get_u8(dmic, 1)));
if (get_s16le(dmic, 2) != 0)
fprintf(out, ",\n\t\t\t\"speaker-distance\":%i", get_s16le(dmic, 2));
if (get_s16le(dmic, 4) != 0)
fprintf(out, ",\n\t\t\t\"horizontal-offset\":%i", get_s16le(dmic, 4));
if (get_s16le(dmic, 6) != 0)
fprintf(out, ",\n\t\t\t\"vertical-offset\":%i", get_s16le(dmic, 6));
if (get_u8(dmic, 8) != 0)
fprintf(out, ",\n\t\t\t\"freq-low-band\":%i", get_u8(dmic, 8) * 5);
if (get_u8(dmic, 9) != 0)
fprintf(out, ",\n\t\t\t\"freq-high-band\":%i", get_u8(dmic, 9) * 500);
if (get_s16le(dmic, 10) != 0)
fprintf(out, ",\n\t\t\t\"direction-angle\":%i", get_s16le(dmic, 10));
if (get_s16le(dmic, 12) != 0)
fprintf(out, ",\n\t\t\t\"elevation-angle\":%i", get_s16le(dmic, 12));
angle_begin = get_s16le(dmic, 14);
angle_end = get_s16le(dmic, 16);
if (!((angle_begin == 180 && angle_end == -180) ||
(angle_begin == -180 && angle_end == 180))) {
fprintf(out, ",\n\t\t\t\"vertical-angle-begin\":%i,\n", angle_begin);
fprintf(out, "\t\t\t\"vertical-angle-end\":%i", angle_end);
}
angle_begin = get_s16le(dmic, 18);
angle_end = get_s16le(dmic, 20);
if (!((angle_begin == 180 && angle_end == -180) ||
(angle_begin == -180 && angle_end == 180))) {
fprintf(out, ",\n\t\t\t\"horizontal-angle-begin\":%i,\n", angle_begin);
fprintf(out, "\t\t\t\"horizontal-angle-end\":%i", angle_end);
}
fprintf(out, "\n\t\t}");
return 0;
}
static int nhlt_dmic_ep_to_json(FILE *out, uint8_t *ep, u_int32_t ep_size)
{
u_int32_t off, specific_cfg_size;
u_int8_t config_type, array_type, mic, num_mics;
int res;
off = NHLT_EP_HDR_SIZE;
specific_cfg_size = get_u32le(ep, off);
if (off + specific_cfg_size > ep_size)
goto oob;
off += 4;
config_type = get_u8(ep, off + 1);
if (config_type != 1) /* mic array */
return 0;
array_type = get_u8(ep, off + 2);
if ((array_type & 0x0f) != 0x0f) {
fprintf(stderr, "Unsupported ArrayType %02x\n", array_type & 0x0f);
return -EINVAL;
}
num_mics = get_u8(ep, off + 3);
fprintf(out, "{\n");
fprintf(out, "\t\"mics-data-version\":1,\n");
fprintf(out, "\t\"mics-data-source\":\"acpi-nhlt\"");
for (mic = 0; mic < num_mics; mic++) {
if (off - NHLT_EP_HDR_SIZE + VENDOR_MIC_CFG_SIZE > specific_cfg_size) {
fprintf(out, "\n}\n");
goto oob;
}
if (mic == 0)
fprintf(out, ",\n\t\"mics\":[\n");
res = nhlt_dmic_config(out, ep + off + 4, mic);
if (res < 0)
return res;
off += VENDOR_MIC_CFG_SIZE;
}
if (num_mics > 0)
fprintf(out, "\n\t]\n");
fprintf(out, "}\n");
return num_mics;
oob:
fprintf(stderr, "Data (out-of-bounds) error\n");
return -EINVAL;
}
static int nhlt_table_to_json(FILE *out, u_int8_t *nhlt, u_int32_t size)
{
u_int32_t _size, off, ep_size;
u_int8_t sum = 0, ep, ep_count, link_type, dmics = 0;
int res;
_size = get_u32le(nhlt, 4);
if (_size != size) {
fprintf(stderr, "Table size mismatch (%08x != %08x)\n", _size, (u_int32_t)size);
return -EINVAL;
}
for (off = 0; off < size; off++)
sum += get_u8(nhlt, off);
if (sum != 0) {
fprintf(stderr, "Checksum error (%02x)\n", sum);
return -EINVAL;
}
/* skip header */
off = ACPI_HDR_SIZE;
ep_count = get_u8(nhlt, off++);
for (ep = 0; ep < ep_count; ep++) {
if (off + 17 > size)
goto oob;
ep_size = get_u32le(nhlt, off);
if (off + ep_size > size)
goto oob;
link_type = get_u8(nhlt, off + 4);
res = 0;
if (link_type == 2) { /* PDM */
res = nhlt_dmic_ep_to_json(out, nhlt + off, ep_size);
if (res > 0)
dmics++;
}
if (res < 0)
return res;
off += ep_size;
}
if (dmics == 0) {
fprintf(stderr, "No dmic endpoint found\n");
return -EINVAL;
}
return 0;
oob:
fprintf(stderr, "Data (out-of-bounds) error\n");
return -EINVAL;
}
static int nhlt_to_json(FILE *out, const char *nhlt_file)
{
struct stat st;
u_int8_t *buf;
int _errno, fd, res;
size_t pos, size;
ssize_t ret;
if (stat(nhlt_file, &st))
return -errno;
size = st.st_size;
if (size < 45)
return -EINVAL;
buf = malloc(size);
if (buf == NULL)
return -ENOMEM;
fd = open(nhlt_file, O_RDONLY);
if (fd < 0) {
_errno = errno;
fprintf(stderr, "Unable to open file '%s': %s\n", nhlt_file, strerror(errno));
return _errno;
}
pos = 0;
while (pos < size) {
ret = read(fd, buf + pos, size - pos);
if (ret <= 0) {
fprintf(stderr, "Short read\n");
close(fd);
free(buf);
return -EIO;
}
pos += ret;
}
close(fd);
res = nhlt_table_to_json(out, buf, size);
free(buf);
return res;
}
/*
*
*/
#define PROG "nhlt-dmic-info"
#define VERSION "1"
#define NHLT_FILE "/sys/firmware/acpi/tables/NHLT"
#define TITLE 0x0100
#define HEADER 0x0200
#define FILEARG 0x0400
#define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0]))
struct arg {
int sarg;
char *larg;
char *comment;
};
static struct arg args[] = {
{ TITLE, NULL, "Usage: nhtl-dmic-json <options>" },
{ HEADER, NULL, "global options:" },
{ 'h', "help", "this help" },
{ 'v', "version", "print version of this program" },
{ FILEARG | 'f', "file", "NHLT file (default " NHLT_FILE ")" },
{ FILEARG | 'o', "output", "output file" },
{ 0, NULL, NULL }
};
static void help(void)
{
struct arg *n = args, *a;
char *larg, sa[4], buf[32];
int sarg;
sa[0] = '-';
sa[2] = ',';
sa[3] = '\0';
while (n->comment) {
a = n;
n++;
sarg = a->sarg;
if (sarg & (HEADER|TITLE)) {
printf("%s%s\n", (sarg & HEADER) != 0 ? "\n" : "",
a->comment);
continue;
}
buf[0] = '\0';
larg = a->larg;
sa[1] = a->sarg;
sprintf(buf, "%s%s%s", sa[1] ? sa : "",
larg ? "--" : "", larg ? larg : "");
if (sarg & FILEARG)
strcat(buf, " #");
printf(" %-15s %s\n", buf, a->comment);
}
}
int main(int argc, char *argv[])
{
char *nhlt_file = NHLT_FILE;
char *output_file = "-";
int i, j, k, res;
struct arg *a;
struct option *o, *long_option;
char *short_option;
FILE *output = NULL;
long_option = calloc(ARRAY_SIZE(args), sizeof(struct option));
if (long_option == NULL)
exit(EXIT_FAILURE);
short_option = malloc(128);
if (short_option == NULL) {
free(long_option);
exit(EXIT_FAILURE);
}
for (i = j = k = 0; i < ARRAY_SIZE(args); i++) {
a = &args[i];
if ((a->sarg & 0xff) == 0)
continue;
o = &long_option[j];
o->name = a->larg;
o->has_arg = (a->sarg & FILEARG) != 0;
o->flag = NULL;
o->val = a->sarg & 0xff;
j++;
short_option[k++] = o->val;
if (o->has_arg)
short_option[k++] = ':';
}
short_option[k] = '\0';
while (1) {
int c;
if ((c = getopt_long(argc, argv, short_option, long_option,
NULL)) < 0)
break;
switch (c) {
case 'h':
help();
res = EXIT_SUCCESS;
goto out;
case 'f':
nhlt_file = optarg;
break;
case 'o':
output_file = optarg;
break;
case 'd':
debug = 1;
break;
case 'v':
printf(PROG " version " VERSION "\n");
res = EXIT_SUCCESS;
goto out;
case '?': // error msg already printed
help();
res = EXIT_FAILURE;
goto out;
default: // should never happen
fprintf(stderr,
"Invalid option '%c' (%d) not handled??\n", c, c);
}
}
free(short_option);
short_option = NULL;
free(long_option);
long_option = NULL;
if (strcmp(output_file, "-") == 0) {
output = stdout;
} else {
output = fopen(output_file, "w+");
if (output == NULL) {
fprintf(stderr, "Unable to create output file \"%s\": %s\n",
output_file, strerror(-errno));
res = EXIT_FAILURE;
goto out;
}
}
if (argc - optind > 0)
fprintf(stderr, PROG ": Ignoring extra parameters\n");
res = 0;
if (nhlt_to_json(output, nhlt_file))
res = EXIT_FAILURE;
out:
if (output)
fclose(output);
free(short_option);
free(long_option);
return res;
}