102 lines
3.2 KiB
C++
102 lines
3.2 KiB
C++
/*
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* Copyright (C) 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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#ifndef HARDWARE_GOOGLE_PIXEL_USB_MONITORFFS_H_
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#define HARDWARE_GOOGLE_PIXEL_USB_MONITORFFS_H_
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#include <android-base/unique_fd.h>
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#include <pixelusb/CommonUtils.h>
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#include <mutex>
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#include <string>
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#include <thread>
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#include <vector>
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namespace android {
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namespace hardware {
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namespace google {
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namespace pixel {
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namespace usb {
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using ::android::base::unique_fd;
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// MonitorFfs automously manages gadget pullup by monitoring
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// the ep file status. Restarts the usb gadget when the ep
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// owner restarts.
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class MonitorFfs {
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private:
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// Monitors the endpoints Inotify events.
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unique_fd mInotifyFd;
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// Control pipe for shutting down the mMonitor thread.
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// mMonitor exits when SHUTDOWN_MONITOR is written into
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// mEventFd/
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unique_fd mEventFd;
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// Pools on mInotifyFd and mEventFd.
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unique_fd mEpollFd;
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std::vector<int> mWatchFd;
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// Maintains the list of Endpoints.
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std::vector<std::string> mEndpointList;
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// protects the CV.
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std::mutex mLock;
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std::condition_variable mCv;
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// protects mInotifyFd, mEpollFd.
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std::mutex mLockFd;
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// Flag to maintain the current status of gadget pullup.
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bool mCurrentUsbFunctionsApplied;
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// Thread object that executes the ep monitoring logic.
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std::unique_ptr<std::thread> mMonitor;
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// Callback to be invoked when gadget is pulled up.
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void (*mCallback)(bool functionsApplied, void *payload);
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void *mPayload;
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// Name of the USB gadget. Used for pullup.
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const char *const mGadgetName;
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// Monitor State
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bool mMonitorRunning;
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public:
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MonitorFfs(const char *const gadget);
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// Inits all the UniqueFds.
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void reset();
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// Starts monitoring endpoints and pullup the gadget when
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// the descriptors are written.
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bool startMonitor();
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// Waits for timeout_ms for gadget pull up to happen.
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// Returns immediately if the gadget is already pulled up.
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bool waitForPullUp(int timeout_ms);
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// Adds the given fd to the watch list.
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bool addInotifyFd(std::string fd);
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// Adds the given endpoint to the watch list.
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void addEndPoint(std::string ep);
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// Registers the async callback from the caller to notify the caller
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// when the gadget pull up happens.
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void registerFunctionsAppliedCallback(void (*callback)(bool functionsApplied, void *(payload)),
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void *payload);
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bool isMonitorRunning();
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// Ep monitoring and the gadget pull up logic.
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static void *startMonitorFd(void *param);
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};
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} // namespace usb
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} // namespace pixel
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} // namespace google
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} // namespace hardware
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} // namespace android
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#endif // HARDWARE_GOOGLE_PIXEL_USB_MONITORFFS_H_
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