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113 lines
3.4 KiB
113 lines
3.4 KiB
/*
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* Copyright (C) 2019 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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#pragma once
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#include "CanSocket.h"
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#include <android-base/unique_fd.h>
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#include <android/hardware/automotive/can/1.0/ICanBus.h>
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#include <android/hardware/automotive/can/1.0/ICanController.h>
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#include <utils/Mutex.h>
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#include <atomic>
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#include <thread>
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namespace android::hardware::automotive::can::V1_0::implementation {
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struct CanBus : public ICanBus {
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using ErrorCallback = std::function<void()>;
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virtual ~CanBus();
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Return<Result> send(const CanMessage& message) override;
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Return<void> listen(const hidl_vec<CanMessageFilter>& filter,
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const sp<ICanMessageListener>& listener, listen_cb _hidl_cb) override;
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Return<sp<ICloseHandle>> listenForErrors(const sp<ICanErrorListener>& listener) override;
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void setErrorCallback(ErrorCallback errcb);
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ICanController::Result up();
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bool down();
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protected:
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/**
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* Blank constructor, since some interface types (such as SLCAN) don't get a name until after
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* being initialized.
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*
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* If using this constructor, you MUST initialize mIfname prior to the completion of preUp().
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*/
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CanBus();
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CanBus(const std::string& ifname);
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/**
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* Prepare the SocketCAN interface.
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*
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* After calling this method, mIfname network interface is available and ready to be brought up.
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*
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* \return OK on success, or an error state on failure. See ICanController::Result
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*/
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virtual ICanController::Result preUp();
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/**
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* Cleanup after bringing the interface down.
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*
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* This is a counterpart to preUp().
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*
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* \return true upon success and false upon failure
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*/
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virtual bool postDown();
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/** Network interface name. */
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std::string mIfname;
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private:
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struct CanMessageListener {
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sp<ICanMessageListener> callback;
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hidl_vec<CanMessageFilter> filter;
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wp<ICloseHandle> closeHandle;
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bool failedOnce = false;
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};
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void clearMsgListeners();
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void clearErrListeners();
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void notifyErrorListeners(ErrorEvent err, bool isFatal);
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void onRead(const struct canfd_frame& frame, std::chrono::nanoseconds timestamp);
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void onError(int errnoVal);
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std::mutex mMsgListenersGuard;
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std::vector<CanMessageListener> mMsgListeners GUARDED_BY(mMsgListenersGuard);
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std::mutex mErrListenersGuard;
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std::vector<sp<ICanErrorListener>> mErrListeners GUARDED_BY(mErrListenersGuard);
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std::unique_ptr<CanSocket> mSocket;
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bool mDownAfterUse;
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/**
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* Guard for up flag is required to be held for entire time when the interface is being used
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* (i.e. message being sent), because we don't want the interface to be torn down while
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* executing that operation.
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*/
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std::mutex mIsUpGuard;
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bool mIsUp GUARDED_BY(mIsUpGuard) = false;
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ErrorCallback mErrCb;
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};
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} // namespace android::hardware::automotive::can::V1_0::implementation
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