94 lines
2.5 KiB
C++
94 lines
2.5 KiB
C++
/*
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* Copyright 2022, The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "CanBus.h"
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#include <android-base/logging.h>
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#include <libnetdevice/libnetdevice.h>
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namespace aidl::android::hardware::automotive::can {
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CanBus::CanBus(std::string_view ifname) : mIfname(ifname) {}
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CanBus::~CanBus() {
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std::lock_guard<std::mutex> lck(mIsUpGuard);
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CHECK(!mIsUp) << "Interface is still up while being destroyed";
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}
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Result CanBus::preUp() {
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return Result::OK;
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}
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bool CanBus::postDown() {
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return true;
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}
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std::string CanBus::getIfaceName() {
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return mIfname;
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}
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Result CanBus::up() {
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std::lock_guard<std::mutex> lck(mIsUpGuard);
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if (mIsUp) {
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LOG(WARNING) << "Interface is already up";
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return Result::INVALID_STATE;
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}
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const auto preResult = preUp();
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if (preResult != Result::OK) return preResult;
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const auto isUp = ::android::netdevice::isUp(mIfname);
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if (!isUp.has_value()) {
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// preUp() should prepare the interface (either create or make sure it's there)
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LOG(ERROR) << "Interface " << mIfname << " didn't get prepared";
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return Result::BAD_INTERFACE_ID;
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}
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if (!*isUp && !::android::netdevice::up(mIfname)) {
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LOG(ERROR) << "Can't bring " << mIfname << " up";
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return Result::UNKNOWN_ERROR;
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}
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mDownAfterUse = !*isUp;
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mIsUp = true;
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return Result::OK;
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}
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Result CanBus::down() {
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std::lock_guard<std::mutex> lck(mIsUpGuard);
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if (!mIsUp) {
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LOG(WARNING) << "Interface is already down";
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return Result::INVALID_STATE;
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}
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mIsUp = false;
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Result success = Result::OK;
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if (mDownAfterUse && !::android::netdevice::down(mIfname)) {
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LOG(ERROR) << "Can't bring " << mIfname << " down";
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// don't return yet, let's try to do best-effort cleanup
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success = Result::UNKNOWN_ERROR;
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}
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if (!postDown()) success = Result::UNKNOWN_ERROR;
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return success;
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}
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} // namespace aidl::android::hardware::automotive::can
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