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| 1 | +// |
| 2 | +// Copyright (C) 2015 Google, Inc. |
| 3 | +// |
| 4 | +// Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | +// you may not use this file except in compliance with the License. |
| 6 | +// You may obtain a copy of the License at: |
| 7 | +// |
| 8 | +// http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | +// |
| 10 | +// Unless required by applicable law or agreed to in writing, software |
| 11 | +// distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | +// See the License for the specific language governing permissions and |
| 14 | +// limitations under the License. |
| 15 | +// |
| 16 | + |
| 17 | +#define LOG_TAG "hal_util" |
| 18 | + |
| 19 | +#include <hardware/bluetooth.h> |
| 20 | +#include <hardware/hardware.h> |
| 21 | + |
| 22 | +#include <dlfcn.h> |
| 23 | +#include <errno.h> |
| 24 | +#include <string.h> |
| 25 | + |
| 26 | +#include "btcore/include/hal_util.h" |
| 27 | +#include "osi/include/log.h" |
| 28 | + |
| 29 | +#if defined(OS_GENERIC) |
| 30 | + |
| 31 | +// TODO(armansito): All logging macros should include __func__ by default (see |
| 32 | +// Bug: 22671731) |
| 33 | +#define HULOGERR(fmt, args...) \ |
| 34 | + LOG_ERROR(LOG_TAG, "[%s] failed to load the Bluetooth library: " fmt, \ |
| 35 | + __func__, ## args) |
| 36 | + |
| 37 | +// TODO(armansito): It might be better to pass the library name in a more |
| 38 | +// generic manner as opposed to hard-coding it here. |
| 39 | +static const char kBluetoothLibraryName[] = "libbluetooth.default.so"; |
| 40 | + |
| 41 | +static int load_bt_library(const struct hw_module_t **module) { |
| 42 | + const char *id = BT_STACK_MODULE_ID; |
| 43 | + |
| 44 | + // Always try to load the default Bluetooth stack on GN builds. |
| 45 | + void *handle = dlopen(kBluetoothLibraryName, RTLD_NOW); |
| 46 | + if (!handle) { |
| 47 | + char const *err_str = dlerror(); |
| 48 | + HULOGERR("%s", err_str ? err_str : "error unknown"); |
| 49 | + goto error; |
| 50 | + } |
| 51 | + |
| 52 | + // Get the address of the struct hal_module_info. |
| 53 | + const char *sym = HAL_MODULE_INFO_SYM_AS_STR; |
| 54 | + struct hw_module_t *hmi = (struct hw_module_t *)dlsym(handle, sym); |
| 55 | + if (!hmi) { |
| 56 | + HULOGERR("%s", sym); |
| 57 | + goto error; |
| 58 | + } |
| 59 | + |
| 60 | + // Check that the id matches. |
| 61 | + if (strcmp(id, hmi->id) != 0) { |
| 62 | + HULOGERR("id=%s does not match HAL module ID: %s", id, hmi->id); |
| 63 | + goto error; |
| 64 | + } |
| 65 | + |
| 66 | + hmi->dso = handle; |
| 67 | + |
| 68 | + // Success. |
| 69 | + LOG_INFO( |
| 70 | + LOG_TAG, "[%s] loaded HAL id=%s path=%s hmi=%p handle=%p", |
| 71 | + __func__, id, kBluetoothLibraryName, hmi, handle); |
| 72 | + |
| 73 | + *module = hmi; |
| 74 | + return 0; |
| 75 | + |
| 76 | +error: |
| 77 | + *module = NULL; |
| 78 | + if (handle) |
| 79 | + dlclose(handle); |
| 80 | + |
| 81 | + return -EINVAL; |
| 82 | +} |
| 83 | + |
| 84 | +#endif // defined(OS_GENERIC) |
| 85 | + |
| 86 | +int hal_util_load_bt_library(const struct hw_module_t **module) { |
| 87 | +#if defined(OS_GENERIC) |
| 88 | + return load_bt_library(module); |
| 89 | +#else // !defined(OS_GENERIC) |
| 90 | + return hw_get_module(BT_STACK_MODULE_ID, module); |
| 91 | +#endif // defined(OS_GENERIC) |
| 92 | +} |
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