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/*
* libdevice-node
*
* Copyright (c) 2015 Samsung Electronics Co., Ltd.
*
* Licensed under the Apache License, Version 2.0 (the License);
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#include <dlfcn.h>
#include <string.h>
#include <errno.h>
#include <linux/limits.h>
#include <hw/common.h>
#include "device-internal.h"
#ifndef EXPORT
#define EXPORT __attribute__ ((visibility("default")))
#endif
#ifndef LIBPATH
#error LIBPATH is not defined.
#endif
#define MODULE_PATH LIBPATH"/hw"
#define STRINGIZE2(s) #s
#define STRINGIZE(s) STRINGIZE2(s)
EXPORT
int hw_get_info(const char *id, const struct hw_info **info)
{
char path[PATH_MAX];
void *handle;
struct hw_info *it;
if (!info || !id)
return -EINVAL;
/* Find matched module path */
snprintf(path, sizeof(path), "%s/%s.so", MODULE_PATH, id);
if (access(path, R_OK) != 0) {
_E("there is no %s device", id);
return -ENODEV;
}
/* Load module */
handle = dlopen(path, RTLD_NOW);
if (!handle) {
_E("fail to open module : %s", dlerror());
goto error;
}
/* Get the address of struct hw_common */
it = dlsym(handle, STRINGIZE(HARDWARE_INFO_SYM));
if (!it) {
_E("fail to find symbol : %s", dlerror());
goto error;
}
/* Check id */
if (strncmp(id, it->id, strlen(id)) != 0) {
_E("fail to match id : id(%s), it->id(%s)", id, it->id);
goto error;
}
it->dso = handle;
*info = it;
return 0;
error:
if (handle)
dlclose(handle);
return -ENOENT;
}
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