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#include <sys/types.h>
#include <dirent.h>
#include <fnmatch.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <libkmod.h>
#include "libsysfs.h"
#include "libldetect.h"
#include "common.h"
#define HID_BUS_NAME "hid"
const char *sysfs_hid_path = "/sys/bus/"HID_BUS_NAME"/devices";
#if 0
#define DEBUG(args...) printf(args)
#else
#define DEBUG(args...)
#endif
#if 0
struct module_alias {
const char *modalias;
const char *module;
};
static struct module_alias aliasdb[] = { {NULL, NULL} };
static const char *resolve_modalias(const struct module_alias *aliasdb,
const char *alias_name)
{
const struct module_alias *alias = aliasdb;
while (alias->modalias != NULL) {
if (fnmatch(alias->modalias, alias_name, 0) == 0)
return alias->module;
alias++;
}
return NULL;
}
#endif
static char *get_field_value(const char *fields, const char *field_name)
{
char *modalias;
char *end;
modalias = strstr(fields, field_name);
if (modalias == NULL)
return NULL;
end = strchr(modalias, '\n');
if (end == NULL)
end = modalias + strlen(modalias);
return strndup(modalias+strlen(field_name), end - (modalias+strlen(field_name)));
}
static char *parse_modalias(char *fields)
{
return get_field_value(fields, "MODALIAS=");
}
static char *parse_name(char *fields)
{
return get_field_value(fields, "HID_NAME=");
}
static void add_entry(struct hid_entries *entry_list, char *name, char *module)
{
struct hid_entry *new_entries;
new_entries = realloc(entry_list->entries, (entry_list->nb+1)*sizeof(*(entry_list->entries)));
if (new_entries != NULL) {
new_entries[entry_list->nb].module = module;
new_entries[entry_list->nb].text = name;
entry_list->entries = new_entries;
entry_list->nb++;
}
}
static void parse_device(struct kmod_ctx *ctx, struct hid_entries *entries, const char *dev)
{
char keyfile[SYSFS_PATH_MAX];
char *modalias;
char *modname;
char *device_name;
struct sysfs_attribute *sysfs_attr;
snprintf(keyfile, sizeof(keyfile)-1, "%s/%s/uevent",
sysfs_hid_path, dev);
sysfs_attr = sysfs_open_attribute(keyfile);
if (!sysfs_attr)
return;
if (sysfs_read_attribute(sysfs_attr) != 0 || !sysfs_attr->value) {
sysfs_close_attribute(sysfs_attr);
return;
}
DEBUG("%s: read %s\n", HID_BUS_NAME, sysfs_attr->value);
modalias = parse_modalias(sysfs_attr->value);
if (modalias == NULL)
return;
DEBUG("%s: modalias is [%s]\n", HID_BUS_NAME, modalias);
device_name = parse_name(sysfs_attr->value);
sysfs_close_attribute(sysfs_attr);
if (device_name != NULL)
DEBUG("%s: device name is [%s]\n", HID_BUS_NAME, device_name);
else
device_name = strdup("HID Device");
modname = modalias_resolve_module(ctx, modalias);
free(modalias);
DEBUG("%s: module name is [%s]\n", HID_BUS_NAME, modname);
if (modname != NULL)
add_entry(entries, device_name, modname);
}
struct hid_entries hid_probe(void)
{
DIR *dir;
struct dirent *dent;
struct hid_entries entry_list = {NULL, 0};
struct kmod_ctx *ctx = modalias_init();
dir = opendir(sysfs_hid_path);
if (dir == NULL)
goto end_probe;
for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
if (dent->d_name[0] == '.')
continue;
DEBUG("%s: device found %s\n", HID_BUS_NAME, dent->d_name);
parse_device(ctx, &entry_list, dent->d_name);
}
end_probe:
modalias_cleanup(ctx);
if (dir)
closedir(dir);
return entry_list;
}
void hid_entries_free(struct hid_entries *entries)
{
unsigned int i;
for (i = 0; i < entries->nb; i++) {
free(entries->entries[i].module);
free(entries->entries[i].text);
}
free(entries->entries);
}
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