diff options
Diffstat (limited to 'wifi/1.5/default/wifi_legacy_hal_factory.cpp')
| -rw-r--r-- | wifi/1.5/default/wifi_legacy_hal_factory.cpp | 263 |
1 files changed, 263 insertions, 0 deletions
diff --git a/wifi/1.5/default/wifi_legacy_hal_factory.cpp b/wifi/1.5/default/wifi_legacy_hal_factory.cpp new file mode 100644 index 0000000000..fbaa284f56 --- /dev/null +++ b/wifi/1.5/default/wifi_legacy_hal_factory.cpp @@ -0,0 +1,263 @@ +/* + * Copyright (C) 2020 The Android Open Source Project + * + * 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 <dirent.h> +#include <sys/stat.h> +#include <sys/types.h> + +#include <android-base/logging.h> +#include <dlfcn.h> +#include <libxml/parser.h> +#include <libxml/tree.h> +#include <libxml/xmlmemory.h> + +#include "wifi_legacy_hal_factory.h" +#include "wifi_legacy_hal_stubs.h" + +namespace { +static constexpr char kVendorHalsDescPath[] = "/vendor/etc/wifi/vendor_hals"; +static constexpr char kVendorHalsDescExt[] = ".xml"; +static constexpr uint32_t kVendorHalsDescVersion = 1; + +bool isDirectory(struct dirent* entryPtr) { + bool isDir = false; + if (entryPtr->d_type != DT_UNKNOWN && entryPtr->d_type != DT_LNK) { + isDir = (entryPtr->d_type == DT_DIR); + } else { + struct stat entryStat; + stat(entryPtr->d_name, &entryStat); + isDir = S_ISDIR(entryStat.st_mode); + } + return isDir; +} + +bool isFileExtension(const char* name, const char* ext) { + if (name == NULL) return false; + if (ext == NULL) return false; + + size_t extLen = strlen(ext); + size_t nameLen = strlen(name); + + if (extLen > nameLen) return false; + + if (strncmp(name + nameLen - extLen, ext, extLen) != 0) return false; + + return true; +} +}; // namespace + +namespace android { +namespace hardware { +namespace wifi { +namespace V1_5 { +namespace implementation { +namespace legacy_hal { + +WifiLegacyHalFactory::WifiLegacyHalFactory( + const std::weak_ptr<wifi_system::InterfaceTool> iface_tool) + : iface_tool_(iface_tool) {} + +std::vector<std::shared_ptr<WifiLegacyHal>> WifiLegacyHalFactory::getHals() { + if (legacy_hals_.empty()) { + if (!initVendorHalDescriptorFromLinked()) + initVendorHalsDescriptorList(); + for (auto& desc : descs_) { + std::shared_ptr<WifiLegacyHal> hal = + std::make_shared<WifiLegacyHal>(iface_tool_, desc.fn, + desc.primary); + legacy_hals_.push_back(hal); + } + } + + return legacy_hals_; +} + +bool WifiLegacyHalFactory::initVendorHalDescriptorFromLinked() { + wifi_hal_lib_desc desc; + + if (!initLinkedHalFunctionTable(&desc.fn)) return false; + + desc.primary = true; + desc.handle = NULL; + descs_.push_back(desc); + return true; +} + +bool WifiLegacyHalFactory::initLinkedHalFunctionTable(wifi_hal_fn* hal_fn) { + init_wifi_vendor_hal_func_table_t initfn; + + initfn = (init_wifi_vendor_hal_func_table_t)dlsym( + RTLD_DEFAULT, "init_wifi_vendor_hal_func_table"); + if (!initfn) { + LOG(INFO) << "no vendor HAL library linked, will try dynamic load"; + return false; + } + + if (!initHalFuncTableWithStubs(hal_fn)) { + LOG(ERROR) << "Can not initialize the basic function pointer table"; + return false; + } + + if (initfn(hal_fn) != WIFI_SUCCESS) { + LOG(ERROR) << "Can not initialize the vendor function pointer table"; + return false; + } + + return true; +} + +/* + * Overall structure of the HAL descriptor XML schema + * + * <?xml version="1.0" encoding="UTF-8"?> + * <WifiVendorHal version="1"> + * <path>/vendor/lib64/libwifi-hal-qcom.so</path> + * <primary>1</primary> + * </WifiVendorHal> + */ +void WifiLegacyHalFactory::initVendorHalsDescriptorList() { + xmlDocPtr xml; + xmlNodePtr node, cnode; + char* version; + std::string path; + xmlChar* value; + wifi_hal_lib_desc desc; + + LOG(INFO) << "processing vendor HALs descriptions in " + << kVendorHalsDescPath; + DIR* dirPtr = ::opendir(kVendorHalsDescPath); + if (dirPtr == NULL) { + LOG(ERROR) << "failed to open " << kVendorHalsDescPath; + return; + } + for (struct dirent* entryPtr = ::readdir(dirPtr); entryPtr != NULL; + entryPtr = ::readdir(dirPtr)) { + if (isDirectory(entryPtr)) continue; + + if (!isFileExtension(entryPtr->d_name, kVendorHalsDescExt)) + continue; // only process .xml files + + LOG(INFO) << "processing config file: " << entryPtr->d_name; + + std::string fullPath(kVendorHalsDescPath); + fullPath.append("/"); + fullPath.append(entryPtr->d_name); + xml = xmlReadFile(fullPath.c_str(), "UTF-8", XML_PARSE_RECOVER); + if (!xml) { + LOG(ERROR) << "failed to parse: " << entryPtr->d_name + << " skipping..."; + continue; + } + node = xmlDocGetRootElement(xml); + if (!node) { + LOG(ERROR) << "empty config file: " << entryPtr->d_name + << " skipping..."; + goto skip; + } + if (xmlStrcmp(node->name, BAD_CAST "WifiVendorHal")) { + LOG(ERROR) << "bad config, root element not WifiVendorHal: " + << entryPtr->d_name << " skipping..."; + goto skip; + } + version = (char*)xmlGetProp(node, BAD_CAST "version"); + if (!version || strtoul(version, NULL, 0) != kVendorHalsDescVersion) { + LOG(ERROR) << "conf file: " << entryPtr->d_name + << "must have version: " << kVendorHalsDescVersion + << ", skipping..."; + goto skip; + } + cnode = node->children; + path.clear(); + desc.primary = false; + while (cnode) { + if (!xmlStrcmp(cnode->name, BAD_CAST "path")) { + value = xmlNodeListGetString(xml, cnode->children, 1); + if (value) path = (char*)value; + xmlFree(value); + } else if (!xmlStrcmp(cnode->name, BAD_CAST "primary")) { + value = xmlNodeListGetString(xml, cnode->children, 1); + desc.primary = !xmlStrcmp(value, BAD_CAST "1"); + xmlFree(value); + } + cnode = cnode->next; + } + if (path.empty()) { + LOG(ERROR) << "hal library path not provided in: " + << entryPtr->d_name << ", skipping..."; + goto skip; + } + if (loadVendorHalLib(path, desc)) { + if (desc.primary) + descs_.insert(descs_.begin(), desc); + else + descs_.push_back(desc); + } + skip: + xmlFreeDoc(xml); + } + ::closedir(dirPtr); +} + +bool WifiLegacyHalFactory::loadVendorHalLib(const std::string& path, + wifi_hal_lib_desc& desc) { + void* h = dlopen(path.c_str(), RTLD_NOW | RTLD_LOCAL); + init_wifi_vendor_hal_func_table_t initfn; + wifi_error res; + + if (!h) { + LOG(ERROR) << "failed to open vendor hal library: " << path; + return false; + } + initfn = (init_wifi_vendor_hal_func_table_t)dlsym( + h, "init_wifi_vendor_hal_func_table"); + if (!initfn) { + LOG(ERROR) << "init_wifi_vendor_hal_func_table not found in: " << path; + goto out_err; + } + + if (!initHalFuncTableWithStubs(&desc.fn)) { + LOG(ERROR) << "Can not initialize the basic function pointer table"; + goto out_err; + } + res = initfn(&desc.fn); + if (res != WIFI_SUCCESS) { + LOG(ERROR) << "failed to initialize the vendor func table in: " << path + << " error: " << res; + goto out_err; + } + + res = desc.fn.wifi_early_initialize(); + // vendor HALs which do not implement early_initialize will return + // WIFI_ERROR_NOT_SUPPORTED, treat this as success. + if (res != WIFI_SUCCESS && res != WIFI_ERROR_NOT_SUPPORTED) { + LOG(ERROR) << "early initialization failed in: " << path + << " error: " << res; + goto out_err; + } + + desc.handle = h; + return true; +out_err: + dlclose(h); + return false; +} + +} // namespace legacy_hal +} // namespace implementation +} // namespace V1_5 +} // namespace wifi +} // namespace hardware +} // namespace android |