| // |
| // 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: |
| // |
| // 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. |
| // |
| |
| #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" |
| |
| // 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[] = "libbluetooth.default.so"; |
| |
| int hal_util_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; |
| |
| error: |
| *module = NULL; |
| if (handle) dlclose(handle); |
| |
| return -EINVAL; |
| } |