blob: 21be6131bfc92973793e4cce3326dfb65a029037 [file] [log] [blame]
// Copyright (C) 2015 Google, Inc.
// 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:
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.
#define LOG_TAG "hal_util"
#include <hardware/bluetooth.h>
#include <hardware/hardware.h>
#include <dlfcn.h>
#include <errno.h>
#include <string.h>
#include "btcore/include/hal_util.h"
#include "osi/include/log.h"
#if defined(OS_GENERIC)
// TODO(armansito): All logging macros should include __func__ by default (see
// Bug: 22671731)
#define HULOGERR(fmt, args...) \
LOG_ERROR(LOG_TAG, "[%s] failed to load the Bluetooth library: " fmt, \
__func__, ##args)
// TODO(armansito): It might be better to pass the library name in a more
// generic manner as opposed to hard-coding it here.
static const char kBluetoothLibraryName[] = "";
static int load_bt_library(const struct hw_module_t** module) {
const char* id = BT_STACK_MODULE_ID;
const char* sym = HAL_MODULE_INFO_SYM_AS_STR;
struct hw_module_t* hmi = nullptr;
// Always try to load the default Bluetooth stack on GN builds.
void* handle = dlopen(kBluetoothLibraryName, RTLD_NOW);
if (!handle) {
char const* err_str = dlerror();
HULOGERR("%s", err_str ? err_str : "error unknown");
goto error;
// Get the address of the struct hal_module_info.
hmi = (struct hw_module_t*)dlsym(handle, sym);
if (!hmi) {
HULOGERR("%s", sym);
goto error;
// Check that the id matches.
if (strcmp(id, hmi->id) != 0) {
HULOGERR("id=%s does not match HAL module ID: %s", id, hmi->id);
goto error;
hmi->dso = handle;
// Success.
LOG_INFO(LOG_TAG, "[%s] loaded HAL id=%s path=%s hmi=%p handle=%p", __func__,
id, kBluetoothLibraryName, hmi, handle);
*module = hmi;
return 0;
*module = NULL;
if (handle) dlclose(handle);
return -EINVAL;
#endif // defined(OS_GENERIC)
int hal_util_load_bt_library(const struct hw_module_t** module) {
#if defined(OS_GENERIC)
return load_bt_library(module);
#else // !defined(OS_GENERIC)
return hw_get_module(BT_STACK_MODULE_ID, module);
#endif // defined(OS_GENERIC)