#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <errno.h>
#include <assert.h>
#include <dirent.h>
#include <regex.h>
#include <sys/stat.h>
#include "kselftest.h"
#include "alsa-local.h"
#define SYSFS_ROOT "/sys"
struct card_cfg_data *conf_cards;
static const char *alsa_config =
"ctl.hw {\n"
" @args [ CARD ]\n"
" @args.CARD.type string\n"
" type hw\n"
" card $CARD\n"
"}\n"
"pcm.hw {\n"
" @args [ CARD DEV SUBDEV ]\n"
" @args.CARD.type string\n"
" @args.DEV.type integer\n"
" @args.SUBDEV.type integer\n"
" type hw\n"
" card $CARD\n"
" device $DEV\n"
" subdevice $SUBDEV\n"
"}\n"
;
#ifdef SND_LIB_VER
#if SND_LIB_VERSION >= SND_LIB_VER(1, 2, 6)
#define LIB_HAS_LOAD_STRING
#endif
#endif
#ifndef LIB_HAS_LOAD_STRING
static int snd_config_load_string(snd_config_t **config, const char *s,
size_t size)
{
snd_input_t *input;
snd_config_t *dst;
int err;
assert(config && s);
if (size == 0)
size = strlen(s);
err = snd_input_buffer_open(&input, s, size);
if (err < 0)
return err;
err = snd_config_top(&dst);
if (err < 0) {
snd_input_close(input);
return err;
}
err = snd_config_load(dst, input);
snd_input_close(input);
if (err < 0) {
snd_config_delete(dst);
return err;
}
*config = dst;
return 0;
}
#endif
snd_config_t *get_alsalib_config(void)
{
snd_config_t *config;
int err;
err = snd_config_load_string(&config, alsa_config, strlen(alsa_config));
if (err < 0) {
ksft_print_msg("Unable to parse custom alsa-lib configuration: %s\n",
snd_strerror(err));
ksft_exit_fail();
}
return config;
}
static struct card_cfg_data *conf_data_by_card(int card, bool msg)
{
struct card_cfg_data *conf;
for (conf = conf_cards; conf; conf = conf->next) {
if (conf->card == card) {
if (msg)
ksft_print_msg("using hw card config %s for card %d\n",
conf->filename, card);
return conf;
}
}
return NULL;
}
static void dump_config_tree(snd_config_t *top)
{
snd_output_t *out;
int err;
err = snd_output_stdio_attach(&out, stdout, 0);
if (err < 0)
ksft_exit_fail_msg("stdout attach\n");
if (snd_config_save(top, out))
ksft_exit_fail_msg("config save\n");
snd_output_close(out);
}
snd_config_t *conf_load_from_file(const char *filename)
{
snd_config_t *dst;
snd_input_t *input;
int err;
err = snd_input_stdio_open(&input, filename, "r");
if (err < 0)
ksft_exit_fail_msg("Unable to parse filename %s\n", filename);
err = snd_config_top(&dst);
if (err < 0)
ksft_exit_fail_msg("Out of memory\n");
err = snd_config_load(dst, input);
snd_input_close(input);
if (err < 0)
ksft_exit_fail_msg("Unable to parse filename %s\n", filename);
return dst;
}
static char *sysfs_get(const char *sysfs_root, const char *id)
{
char path[PATH_MAX], link[PATH_MAX + 1];
struct stat sb;
ssize_t len;
char *e;
int fd;
if (id[0] == '/')
id++;
snprintf(path, sizeof(path), "%s/%s", sysfs_root, id);
if (lstat(path, &sb) != 0)
return NULL;
if (S_ISLNK(sb.st_mode)) {
len = readlink(path, link, sizeof(link) - 1);
if (len <= 0) {
ksft_exit_fail_msg("sysfs: cannot read link '%s': %s\n",
path, strerror(errno));
return NULL;
}
link[len] = '\0';
e = strrchr(link, '/');
if (e)
return strdup(e + 1);
return NULL;
}
if (S_ISDIR(sb.st_mode))
return NULL;
if ((sb.st_mode & S_IRUSR) == 0)
return NULL;
fd = open(path, O_RDONLY);
if (fd < 0) {
if (errno == ENOENT)
return NULL;
ksft_exit_fail_msg("sysfs: open failed for '%s': %s\n",
path, strerror(errno));
}
len = read(fd, path, sizeof(path)-1);
close(fd);
if (len < 0)
ksft_exit_fail_msg("sysfs: unable to read value '%s': %s\n",
path, strerror(errno));
while (len > 0 && path[len-1] == '\n')
len--;
path[len] = '\0';
e = strdup(path);
if (e == NULL)
ksft_exit_fail_msg("Out of memory\n");
return e;
}
static bool sysfs_match(const char *sysfs_root, snd_config_t *config)
{
snd_config_t *node, *path_config, *regex_config;
snd_config_iterator_t i, next;
const char *path_string, *regex_string, *v;
regex_t re;
regmatch_t match[1];
int iter = 0, ret;
snd_config_for_each(i, next, config) {
node = snd_config_iterator_entry(i);
if (snd_config_search(node, "path", &path_config))
ksft_exit_fail_msg("Missing path field in the sysfs block\n");
if (snd_config_search(node, "regex", ®ex_config))
ksft_exit_fail_msg("Missing regex field in the sysfs block\n");
if (snd_config_get_string(path_config, &path_string))
ksft_exit_fail_msg("Path field in the sysfs block is not a string\n");
if (snd_config_get_string(regex_config, ®ex_string))
ksft_exit_fail_msg("Regex field in the sysfs block is not a string\n");
iter++;
v = sysfs_get(sysfs_root, path_string);
if (!v)
return false;
if (regcomp(&re, regex_string, REG_EXTENDED))
ksft_exit_fail_msg("Wrong regex '%s'\n", regex_string);
ret = regexec(&re, v, 1, match, 0);
regfree(&re);
if (ret)
return false;
}
return iter > 0;
}
static void assign_card_config(int card, const char *sysfs_card_root)
{
struct card_cfg_data *data;
snd_config_t *sysfs_card_config;
for (data = conf_cards; data; data = data->next) {
snd_config_search(data->config, "sysfs", &sysfs_card_config);
if (!sysfs_match(sysfs_card_root, sysfs_card_config))
continue;
data->card = card;
break;
}
}
static void assign_card_configs(void)
{
char fn[128];
int card;
for (card = 0; card < 32; card++) {
snprintf(fn, sizeof(fn), "%s/class/sound/card%d", SYSFS_ROOT, card);
if (access(fn, R_OK) == 0)
assign_card_config(card, fn);
}
}
static int filename_filter(const struct dirent *dirent)
{
size_t flen;
if (dirent == NULL)
return 0;
if (dirent->d_type == DT_DIR)
return 0;
flen = strlen(dirent->d_name);
if (flen <= 5)
return 0;
if (strncmp(&dirent->d_name[flen-5], ".conf", 5) == 0)
return 1;
return 0;
}
static bool match_config(const char *filename)
{
struct card_cfg_data *data;
snd_config_t *config, *sysfs_config, *card_config, *sysfs_card_config, *node;
snd_config_iterator_t i, next;
config = conf_load_from_file(filename);
if (snd_config_search(config, "sysfs", &sysfs_config) ||
snd_config_get_type(sysfs_config) != SND_CONFIG_TYPE_COMPOUND)
ksft_exit_fail_msg("Missing global sysfs block in filename %s\n", filename);
if (snd_config_search(config, "card", &card_config) ||
snd_config_get_type(card_config) != SND_CONFIG_TYPE_COMPOUND)
ksft_exit_fail_msg("Missing global card block in filename %s\n", filename);
if (!sysfs_match(SYSFS_ROOT, sysfs_config))
return false;
snd_config_for_each(i, next, card_config) {
node = snd_config_iterator_entry(i);
if (snd_config_search(node, "sysfs", &sysfs_card_config) ||
snd_config_get_type(sysfs_card_config) != SND_CONFIG_TYPE_COMPOUND)
ksft_exit_fail_msg("Missing card sysfs block in filename %s\n", filename);
data = malloc(sizeof(*data));
if (!data)
ksft_exit_fail_msg("Out of memory\n");
data->filename = filename;
data->config = node;
data->card = -1;
if (snd_config_get_id(node, &data->config_id))
ksft_exit_fail_msg("snd_config_get_id failed for card\n");
data->next = conf_cards;
conf_cards = data;
}
return true;
}
void conf_load(void)
{
const char *fn = "conf.d";
struct dirent **namelist;
int n, j;
n = scandir(fn, &namelist, filename_filter, alphasort);
if (n < 0)
ksft_exit_fail_msg("scandir: %s\n", strerror(errno));
for (j = 0; j < n; j++) {
size_t sl = strlen(fn) + strlen(namelist[j]->d_name) + 2;
char *filename = malloc(sl);
if (filename == NULL)
ksft_exit_fail_msg("Out of memory\n");
sprintf(filename, "%s/%s", fn, namelist[j]->d_name);
if (match_config(filename))
filename = NULL;
free(filename);
free(namelist[j]);
}
free(namelist);
assign_card_configs();
}
void conf_free(void)
{
struct card_cfg_data *conf;
while (conf_cards) {
conf = conf_cards;
conf_cards = conf->next;
snd_config_delete(conf->config);
}
}
snd_config_t *conf_by_card(int card)
{
struct card_cfg_data *conf;
conf = conf_data_by_card(card, true);
if (conf)
return conf->config;
return NULL;
}
static int conf_get_by_keys(snd_config_t *root, const char *key1,
const char *key2, snd_config_t **result)
{
int ret;
if (key1) {
ret = snd_config_search(root, key1, &root);
if (ret != -ENOENT && ret < 0)
return ret;
}
if (key2)
ret = snd_config_search(root, key2, &root);
if (ret >= 0)
*result = root;
return ret;
}
snd_config_t *conf_get_subtree(snd_config_t *root, const char *key1, const char *key2)
{
int ret;
if (!root)
return NULL;
ret = conf_get_by_keys(root, key1, key2, &root);
if (ret == -ENOENT)
return NULL;
if (ret < 0)
ksft_exit_fail_msg("key '%s'.'%s' search error: %s\n", key1, key2, snd_strerror(ret));
return root;
}
int conf_get_count(snd_config_t *root, const char *key1, const char *key2)
{
snd_config_t *cfg;
snd_config_iterator_t i, next;
int count, ret;
if (!root)
return -1;
ret = conf_get_by_keys(root, key1, key2, &cfg);
if (ret == -ENOENT)
return -1;
if (ret < 0)
ksft_exit_fail_msg("key '%s'.'%s' search error: %s\n", key1, key2, snd_strerror(ret));
if (snd_config_get_type(cfg) != SND_CONFIG_TYPE_COMPOUND)
ksft_exit_fail_msg("key '%s'.'%s' is not a compound\n", key1, key2);
count = 0;
snd_config_for_each(i, next, cfg)
count++;
return count;
}
const char *conf_get_string(snd_config_t *root, const char *key1, const char *key2, const char *def)
{
snd_config_t *cfg;
const char *s;
int ret;
if (!root)
return def;
ret = conf_get_by_keys(root, key1, key2, &cfg);
if (ret == -ENOENT)
return def;
if (ret < 0)
ksft_exit_fail_msg("key '%s'.'%s' search error: %s\n", key1, key2, snd_strerror(ret));
if (snd_config_get_string(cfg, &s))
ksft_exit_fail_msg("key '%s'.'%s' is not a string\n", key1, key2);
return s;
}
long conf_get_long(snd_config_t *root, const char *key1, const char *key2, long def)
{
snd_config_t *cfg;
long l;
int ret;
if (!root)
return def;
ret = conf_get_by_keys(root, key1, key2, &cfg);
if (ret == -ENOENT)
return def;
if (ret < 0)
ksft_exit_fail_msg("key '%s'.'%s' search error: %s\n", key1, key2, snd_strerror(ret));
if (snd_config_get_integer(cfg, &l))
ksft_exit_fail_msg("key '%s'.'%s' is not an integer\n", key1, key2);
return l;
}
int conf_get_bool(snd_config_t *root, const char *key1, const char *key2, int def)
{
snd_config_t *cfg;
int ret;
if (!root)
return def;
ret = conf_get_by_keys(root, key1, key2, &cfg);
if (ret == -ENOENT)
return def;
if (ret < 0)
ksft_exit_fail_msg("key '%s'.'%s' search error: %s\n", key1, key2, snd_strerror(ret));
ret = snd_config_get_bool(cfg);
if (ret < 0)
ksft_exit_fail_msg("key '%s'.'%s' is not a bool\n", key1, key2);
return !!ret;
}
void conf_get_string_array(snd_config_t *root, const char *key1, const char *key2,
const char **array, int array_size, const char *def)
{
snd_config_t *cfg;
char buf[16];
int ret, index;
ret = conf_get_by_keys(root, key1, key2, &cfg);
if (ret == -ENOENT)
cfg = NULL;
else if (ret < 0)
ksft_exit_fail_msg("key '%s'.'%s' search error: %s\n", key1, key2, snd_strerror(ret));
for (index = 0; index < array_size; index++) {
if (cfg == NULL) {
array[index] = def;
} else {
sprintf(buf, "%i", index);
array[index] = conf_get_string(cfg, buf, NULL, def);
}
}
}
