Merge "Add new common USB Gadget Aidl file"
diff --git a/usb/include/pixelusb/UsbGadgetAidlCommon.h b/usb/include/pixelusb/UsbGadgetAidlCommon.h
new file mode 100644
index 0000000..f718b35
--- /dev/null
+++ b/usb/include/pixelusb/UsbGadgetAidlCommon.h
@@ -0,0 +1,182 @@
+/*
+ * Copyright (C) 2018 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.
+ */
+
+#ifndef HARDWARE_GOOGLE_PIXEL_USB_USBGADGETAIDLCOMMON_H
+#define HARDWARE_GOOGLE_PIXEL_USB_USBGADGETAIDLCOMMON_H
+
+#include <android-base/file.h>
+#include <android-base/properties.h>
+#include <android-base/unique_fd.h>
+
+#include <aidl/android/hardware/usb/gadget/IUsbGadget.h>
+#include <aidl/android/hardware/usb/gadget/GadgetFunction.h>
+
+#include <dirent.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <sys/epoll.h>
+#include <sys/eventfd.h>
+#include <sys/inotify.h>
+#include <sys/mount.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <utils/Log.h>
+#include <chrono>
+#include <condition_variable>
+#include <mutex>
+#include <string>
+#include <thread>
+
+namespace android {
+namespace hardware {
+namespace google {
+namespace pixel {
+namespace usb {
+
+constexpr int kBufferSize = 512;
+constexpr int kMaxFilePathLength = 256;
+constexpr int kEpollEvents = 10;
+constexpr bool kDebug = false;
+constexpr int kDisconnectWaitUs = 100000;
+constexpr int kPullUpDelay = 500000;
+constexpr int kShutdownMonitor = 100;
+
+constexpr char kBuildType[] = "ro.build.type";
+constexpr char kPersistentVendorConfig[] = "persist.vendor.usb.usbradio.config";
+constexpr char kVendorConfig[] = "vendor.usb.config";
+constexpr char kVendorRndisConfig[] = "vendor.usb.rndis.config";
+
+#define GADGET_PATH "/config/usb_gadget/g1/"
+#define PULLUP_PATH GADGET_PATH "UDC"
+#define PERSISTENT_BOOT_MODE "ro.bootmode"
+#define VENDOR_ID_PATH GADGET_PATH "idVendor"
+#define PRODUCT_ID_PATH GADGET_PATH "idProduct"
+#define DEVICE_CLASS_PATH GADGET_PATH "bDeviceClass"
+#define DEVICE_SUB_CLASS_PATH GADGET_PATH "bDeviceSubClass"
+#define DEVICE_PROTOCOL_PATH GADGET_PATH "bDeviceProtocol"
+#define DESC_USE_PATH GADGET_PATH "os_desc/use"
+#define OS_DESC_PATH GADGET_PATH "os_desc/b.1"
+#define CONFIG_PATH GADGET_PATH "configs/b.1/"
+#define FUNCTIONS_PATH GADGET_PATH "functions/"
+#define FUNCTION_NAME "function"
+#define FUNCTION_PATH CONFIG_PATH FUNCTION_NAME
+#define RNDIS_PATH FUNCTIONS_PATH "gsi.rndis"
+
+using ::aidl::android::hardware::usb::gadget::GadgetFunction;
+using ::aidl::android::hardware::usb::gadget::Status;
+using ::android::base::GetProperty;
+using ::android::base::SetProperty;
+using ::android::base::unique_fd;
+using ::android::base::WriteStringToFile;
+
+using ::std::lock_guard;
+using ::std::move;
+using ::std::mutex;
+using ::std::string;
+using ::std::thread;
+using ::std::unique_ptr;
+using ::std::vector;
+using ::std::chrono::microseconds;
+using ::std::chrono::steady_clock;
+using ::std::literals::chrono_literals::operator""ms;
+
+// MonitorFfs automously manages gadget pullup by monitoring
+// the ep file status. Restarts the usb gadget when the ep
+// owner restarts.
+class MonitorFfs {
+ private:
+ // Monitors the endpoints Inotify events.
+ unique_fd mInotifyFd;
+ // Control pipe for shutting down the mMonitor thread.
+ // mMonitor exits when SHUTDOWN_MONITOR is written into
+ // mEventFd/
+ unique_fd mEventFd;
+ // Pools on mInotifyFd and mEventFd.
+ unique_fd mEpollFd;
+ vector<int> mWatchFd;
+
+ // Maintains the list of Endpoints.
+ vector<string> mEndpointList;
+ // protects the CV.
+ std::mutex mLock;
+ std::condition_variable mCv;
+ // protects mInotifyFd, mEpollFd.
+ std::mutex mLockFd;
+
+ // Flag to maintain the current status of gadget pullup.
+ bool mCurrentUsbFunctionsApplied;
+
+ // Thread object that executes the ep monitoring logic.
+ unique_ptr<thread> mMonitor;
+ // Callback to be invoked when gadget is pulled up.
+ void (*mCallback)(bool functionsApplied, void *payload);
+ void *mPayload;
+ // Name of the USB gadget. Used for pullup.
+ const char *const mGadgetName;
+ // Monitor State
+ bool mMonitorRunning;
+
+ public:
+ MonitorFfs(const char *const gadget);
+ // Inits all the UniqueFds.
+ void reset();
+ // Starts monitoring endpoints and pullup the gadget when
+ // the descriptors are written.
+ bool startMonitor();
+ // Waits for timeout_ms for gadget pull up to happen.
+ // Returns immediately if the gadget is already pulled up.
+ bool waitForPullUp(int timeout_ms);
+ // Adds the given fd to the watch list.
+ bool addInotifyFd(string fd);
+ // Adds the given endpoint to the watch list.
+ void addEndPoint(string ep);
+ // Registers the async callback from the caller to notify the caller
+ // when the gadget pull up happens.
+ void registerFunctionsAppliedCallback(void (*callback)(bool functionsApplied,
+ void *(payload)),
+ void *payload);
+ bool isMonitorRunning();
+ // Ep monitoring and the gadget pull up logic.
+ static void *startMonitorFd(void *param);
+};
+
+//**************** Helper functions ************************//
+
+// Adds the given fd to the epollfd(epfd).
+int addEpollFd(const unique_fd &epfd, const unique_fd &fd);
+// Removes all the usb functions link in the specified path.
+int unlinkFunctions(const char *path);
+// Craetes a configfs link for the function.
+int linkFunction(const char *function, int index);
+// Sets the USB VID and PID.
+Status setVidPid(const char *vid, const char *pid);
+// Extracts vendor functions from the vendor init properties.
+std::string getVendorFunctions();
+// Adds Adb to the usb configuration.
+Status addAdb(MonitorFfs *monitorFfs, int *functionCount);
+// Adds all applicable generic android usb functions other than ADB.
+Status addGenericAndroidFunctions(MonitorFfs *monitorFfs, uint64_t functions,
+ bool *ffsEnabled, int *functionCount);
+// Pulls down USB gadget.
+Status resetGadget();
+
+} // namespace usb
+} // namespace pixel
+} // namespace google
+} // namespace hardware
+} // namespace android
+#endif
