diff --git a/usb/lib/Android.bp b/usb/lib/Android.bp new file mode 100644 index 0000000..3bf46e3 --- /dev/null +++ b/usb/lib/Android.bp @@ -0,0 +1,50 @@ +/* + * 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. + */ + +package { + // See: http://go/android-license-faq + // A large-scale-change added 'default_applicable_licenses' to import + // all of the 'license_kinds' from "hardware_interfaces_license" + // to get the below license kinds: + // SPDX-license-identifier-Apache-2.0 + default_applicable_licenses: ["hardware_interfaces_license"], +} + +cc_library_static { + name: "libusbconfigfs-2", + vendor_available: true, + export_include_dirs: ["include"], + + srcs: [ + "UsbGadgetUtils.cpp", + "MonitorFfs.cpp", + ], + + cflags: [ + "-Wall", + "-Werror", + ], + + shared_libs: [ + "android.hardware.usb.gadget@1.0", + "android.hardware.usb.gadget@1.1", + "android.hardware.usb.gadget@1.2", + "libbase", + "libcutils", + "libhidlbase", + "libutils", + ], +} diff --git a/usb/lib/MonitorFfs.cpp b/usb/lib/MonitorFfs.cpp new file mode 100644 index 0000000..6d09a8a --- /dev/null +++ b/usb/lib/MonitorFfs.cpp @@ -0,0 +1,269 @@ +/* + * 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. + */ + +#define LOG_TAG "libusbconfigfs" + +#include "include/UsbGadgetCommon.h" + +namespace android { +namespace hardware { +namespace usb { +namespace gadget { + +static volatile bool gadgetPullup; + +MonitorFfs::MonitorFfs(const char* const gadget) + : mWatchFd(), + mEndpointList(), + mLock(), + mCv(), + mLockFd(), + mCurrentUsbFunctionsApplied(false), + mMonitor(), + mCallback(NULL), + mPayload(NULL), + mGadgetName(gadget), + mMonitorRunning(false) { + unique_fd eventFd(eventfd(0, 0)); + if (eventFd == -1) { + ALOGE("mEventFd failed to create %d", errno); + abort(); + } + + unique_fd epollFd(epoll_create(2)); + if (epollFd == -1) { + ALOGE("mEpollFd failed to create %d", errno); + abort(); + } + + unique_fd inotifyFd(inotify_init()); + if (inotifyFd < 0) { + ALOGE("inotify init failed"); + abort(); + } + + if (addEpollFd(epollFd, inotifyFd) == -1) abort(); + + if (addEpollFd(epollFd, eventFd) == -1) abort(); + + mEpollFd = std::move(epollFd); + mInotifyFd = std::move(inotifyFd); + mEventFd = std::move(eventFd); + gadgetPullup = false; +} + +static void displayInotifyEvent(struct inotify_event* i) { + ALOGE(" wd =%2d; ", i->wd); + if (i->cookie > 0) ALOGE("cookie =%4d; ", i->cookie); + + ALOGE("mask = "); + if (i->mask & IN_ACCESS) ALOGE("IN_ACCESS "); + if (i->mask & IN_ATTRIB) ALOGE("IN_ATTRIB "); + if (i->mask & IN_CLOSE_NOWRITE) ALOGE("IN_CLOSE_NOWRITE "); + if (i->mask & IN_CLOSE_WRITE) ALOGE("IN_CLOSE_WRITE "); + if (i->mask & IN_CREATE) ALOGE("IN_CREATE "); + if (i->mask & IN_DELETE) ALOGE("IN_DELETE "); + if (i->mask & IN_DELETE_SELF) ALOGE("IN_DELETE_SELF "); + if (i->mask & IN_IGNORED) ALOGE("IN_IGNORED "); + if (i->mask & IN_ISDIR) ALOGE("IN_ISDIR "); + if (i->mask & IN_MODIFY) ALOGE("IN_MODIFY "); + if (i->mask & IN_MOVE_SELF) ALOGE("IN_MOVE_SELF "); + if (i->mask & IN_MOVED_FROM) ALOGE("IN_MOVED_FROM "); + if (i->mask & IN_MOVED_TO) ALOGE("IN_MOVED_TO "); + if (i->mask & IN_OPEN) ALOGE("IN_OPEN "); + if (i->mask & IN_Q_OVERFLOW) ALOGE("IN_Q_OVERFLOW "); + if (i->mask & IN_UNMOUNT) ALOGE("IN_UNMOUNT "); + ALOGE("\n"); + + if (i->len > 0) ALOGE(" name = %s\n", i->name); +} + +void* MonitorFfs::startMonitorFd(void* param) { + MonitorFfs* monitorFfs = (MonitorFfs*)param; + char buf[kBufferSize]; + bool writeUdc = true, stopMonitor = false; + struct epoll_event events[kEpollEvents]; + steady_clock::time_point disconnect; + + bool descriptorWritten = true; + for (int i = 0; i < static_cast(monitorFfs->mEndpointList.size()); i++) { + if (access(monitorFfs->mEndpointList.at(i).c_str(), R_OK)) { + descriptorWritten = false; + break; + } + } + + // notify here if the endpoints are already present. + if (descriptorWritten) { + usleep(kPullUpDelay); + if (!!WriteStringToFile(monitorFfs->mGadgetName, PULLUP_PATH)) { + lock_guard lock(monitorFfs->mLock); + monitorFfs->mCurrentUsbFunctionsApplied = true; + monitorFfs->mCallback(monitorFfs->mCurrentUsbFunctionsApplied, monitorFfs->mPayload); + gadgetPullup = true; + writeUdc = false; + ALOGI("GADGET pulled up"); + monitorFfs->mCv.notify_all(); + } + } + + while (!stopMonitor) { + int nrEvents = epoll_wait(monitorFfs->mEpollFd, events, kEpollEvents, -1); + + if (nrEvents <= 0) { + ALOGE("epoll wait did not return descriptor number"); + continue; + } + + for (int i = 0; i < nrEvents; i++) { + ALOGI("event=%u on fd=%d\n", events[i].events, events[i].data.fd); + + if (events[i].data.fd == monitorFfs->mInotifyFd) { + // Process all of the events in buffer returned by read(). + int numRead = read(monitorFfs->mInotifyFd, buf, kBufferSize); + for (char* p = buf; p < buf + numRead;) { + struct inotify_event* event = (struct inotify_event*)p; + if (kDebug) displayInotifyEvent(event); + + p += sizeof(struct inotify_event) + event->len; + + bool descriptorPresent = true; + for (int j = 0; j < static_cast(monitorFfs->mEndpointList.size()); j++) { + if (access(monitorFfs->mEndpointList.at(j).c_str(), R_OK)) { + if (kDebug) ALOGI("%s absent", monitorFfs->mEndpointList.at(j).c_str()); + descriptorPresent = false; + break; + } + } + + if (!descriptorPresent && !writeUdc) { + if (kDebug) ALOGI("endpoints not up"); + writeUdc = true; + disconnect = std::chrono::steady_clock::now(); + } else if (descriptorPresent && writeUdc) { + steady_clock::time_point temp = steady_clock::now(); + + if (std::chrono::duration_cast(temp - disconnect).count() < + kPullUpDelay) + usleep(kPullUpDelay); + + if (!!WriteStringToFile(monitorFfs->mGadgetName, PULLUP_PATH)) { + lock_guard lock(monitorFfs->mLock); + monitorFfs->mCurrentUsbFunctionsApplied = true; + monitorFfs->mCallback(monitorFfs->mCurrentUsbFunctionsApplied, + monitorFfs->mPayload); + ALOGI("GADGET pulled up"); + writeUdc = false; + gadgetPullup = true; + // notify the main thread to signal userspace. + monitorFfs->mCv.notify_all(); + } + } + } + } else { + uint64_t flag; + read(monitorFfs->mEventFd, &flag, sizeof(flag)); + if (flag == 100) { + stopMonitor = true; + break; + } + } + } + } + return NULL; +} + +void MonitorFfs::reset() { + lock_guard lock(mLockFd); + uint64_t flag = 100; + unsigned long ret; + + if (mMonitorRunning) { + // Stop the monitor thread by writing into signal fd. + ret = TEMP_FAILURE_RETRY(write(mEventFd, &flag, sizeof(flag))); + if (ret < 0) ALOGE("Error writing eventfd errno=%d", errno); + + ALOGI("mMonitor signalled to exit"); + mMonitor->join(); + ALOGI("mMonitor destroyed"); + mMonitorRunning = false; + } + + for (std::vector::size_type i = 0; i != mWatchFd.size(); i++) + inotify_rm_watch(mInotifyFd, mWatchFd[i]); + + mEndpointList.clear(); + gadgetPullup = false; + mCallback = NULL; + mPayload = NULL; +} + +bool MonitorFfs::startMonitor() { + mMonitor = unique_ptr(new thread(this->startMonitorFd, this)); + mMonitorRunning = true; + return true; +} + +bool MonitorFfs::isMonitorRunning() { + return mMonitorRunning; +} + +bool MonitorFfs::waitForPullUp(int timeout_ms) { + std::unique_lock lk(mLock); + + if (gadgetPullup) return true; + + if (mCv.wait_for(lk, timeout_ms * 1ms, [] { return gadgetPullup; })) { + ALOGI("monitorFfs signalled true"); + return true; + } else { + ALOGI("monitorFfs signalled error"); + // continue monitoring as the descriptors might be written at a later + // point. + return false; + } +} + +bool MonitorFfs::addInotifyFd(string fd) { + lock_guard lock(mLockFd); + int wfd; + + wfd = inotify_add_watch(mInotifyFd, fd.c_str(), IN_ALL_EVENTS); + if (wfd == -1) + return false; + else + mWatchFd.push_back(wfd); + + return true; +} + +void MonitorFfs::addEndPoint(string ep) { + lock_guard lock(mLockFd); + + mEndpointList.push_back(ep); +} + +void MonitorFfs::registerFunctionsAppliedCallback(void (*callback)(bool functionsApplied, + void* payload), + void* payload) { + mCallback = callback; + mPayload = payload; +} + +} // namespace gadget +} // namespace usb +} // namespace hardware +} // namespace android diff --git a/usb/lib/UsbGadgetUtils.cpp b/usb/lib/UsbGadgetUtils.cpp new file mode 100644 index 0000000..0924da7 --- /dev/null +++ b/usb/lib/UsbGadgetUtils.cpp @@ -0,0 +1,207 @@ +/* + * 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. + */ + +#define LOG_TAG "libusbconfigfs" + +#include "include/UsbGadgetCommon.h" + +namespace android { +namespace hardware { +namespace usb { +namespace gadget { + +int unlinkFunctions(const char* path) { + DIR* config = opendir(path); + struct dirent* function; + char filepath[kMaxFilePathLength]; + int ret = 0; + + if (config == NULL) return -1; + + // d_type does not seems to be supported in /config + // so filtering by name. + while (((function = readdir(config)) != NULL)) { + if ((strstr(function->d_name, FUNCTION_NAME) == NULL)) continue; + // build the path for each file in the folder. + sprintf(filepath, "%s/%s", path, function->d_name); + ret = remove(filepath); + if (ret) { + ALOGE("Unable remove file %s errno:%d", filepath, errno); + break; + } + } + + closedir(config); + return ret; +} + +int addEpollFd(const unique_fd& epfd, const unique_fd& fd) { + struct epoll_event event; + int ret; + + event.data.fd = fd; + event.events = EPOLLIN; + + ret = epoll_ctl(epfd, EPOLL_CTL_ADD, fd, &event); + if (ret) ALOGE("epoll_ctl error %d", errno); + + return ret; +} + +int linkFunction(const char* function, int index) { + char functionPath[kMaxFilePathLength]; + char link[kMaxFilePathLength]; + + sprintf(functionPath, "%s%s", FUNCTIONS_PATH, function); + sprintf(link, "%s%d", FUNCTION_PATH, index); + if (symlink(functionPath, link)) { + ALOGE("Cannot create symlink %s -> %s errno:%d", link, functionPath, errno); + return -1; + } + return 0; +} + +Status setVidPid(const char* vid, const char* pid) { + if (!WriteStringToFile(vid, VENDOR_ID_PATH)) return Status::ERROR; + + if (!WriteStringToFile(pid, PRODUCT_ID_PATH)) return Status::ERROR; + + return Status::SUCCESS; +} + +std::string getVendorFunctions() { + if (GetProperty(kBuildType, "") == "user") return "user"; + + std::string bootMode = GetProperty(PERSISTENT_BOOT_MODE, ""); + std::string persistVendorFunctions = GetProperty(kPersistentVendorConfig, ""); + std::string vendorFunctions = GetProperty(kVendorConfig, ""); + std::string ret = ""; + + if (vendorFunctions != "") { + ret = vendorFunctions; + } else if (bootMode == "usbradio" || bootMode == "factory" || bootMode == "ffbm-00" || + bootMode == "ffbm-01") { + if (persistVendorFunctions != "") + ret = persistVendorFunctions; + else + ret = "diag"; + // vendor.usb.config will reflect the current configured functions + SetProperty(kVendorConfig, ret); + } + + return ret; +} + +Status resetGadget() { + ALOGI("setCurrentUsbFunctions None"); + + if (!WriteStringToFile("none", PULLUP_PATH)) ALOGI("Gadget cannot be pulled down"); + + if (!WriteStringToFile("0", DEVICE_CLASS_PATH)) return Status::ERROR; + + if (!WriteStringToFile("0", DEVICE_SUB_CLASS_PATH)) return Status::ERROR; + + if (!WriteStringToFile("0", DEVICE_PROTOCOL_PATH)) return Status::ERROR; + + if (!WriteStringToFile("0", DESC_USE_PATH)) return Status::ERROR; + + if (unlinkFunctions(CONFIG_PATH)) return Status::ERROR; + + return Status::SUCCESS; +} + +Status addGenericAndroidFunctions(MonitorFfs* monitorFfs, uint64_t functions, bool* ffsEnabled, + int* functionCount) { + if (((functions & GadgetFunction::MTP) != 0)) { + *ffsEnabled = true; + ALOGI("setCurrentUsbFunctions mtp"); + if (!WriteStringToFile("1", DESC_USE_PATH)) return Status::ERROR; + + if (!monitorFfs->addInotifyFd("/dev/usb-ffs/mtp/")) return Status::ERROR; + + if (linkFunction("ffs.mtp", (*functionCount)++)) return Status::ERROR; + + // Add endpoints to be monitored. + monitorFfs->addEndPoint("/dev/usb-ffs/mtp/ep1"); + monitorFfs->addEndPoint("/dev/usb-ffs/mtp/ep2"); + monitorFfs->addEndPoint("/dev/usb-ffs/mtp/ep3"); + } else if (((functions & GadgetFunction::PTP) != 0)) { + *ffsEnabled = true; + ALOGI("setCurrentUsbFunctions ptp"); + if (!WriteStringToFile("1", DESC_USE_PATH)) return Status::ERROR; + + if (!monitorFfs->addInotifyFd("/dev/usb-ffs/ptp/")) return Status::ERROR; + + if (linkFunction("ffs.ptp", (*functionCount)++)) return Status::ERROR; + + // Add endpoints to be monitored. + monitorFfs->addEndPoint("/dev/usb-ffs/ptp/ep1"); + monitorFfs->addEndPoint("/dev/usb-ffs/ptp/ep2"); + monitorFfs->addEndPoint("/dev/usb-ffs/ptp/ep3"); + } + + if ((functions & GadgetFunction::MIDI) != 0) { + ALOGI("setCurrentUsbFunctions MIDI"); + if (linkFunction("midi.gs5", (*functionCount)++)) return Status::ERROR; + } + + if ((functions & GadgetFunction::ACCESSORY) != 0) { + ALOGI("setCurrentUsbFunctions Accessory"); + if (linkFunction("accessory.gs2", (*functionCount)++)) return Status::ERROR; + } + + if ((functions & GadgetFunction::AUDIO_SOURCE) != 0) { + ALOGI("setCurrentUsbFunctions Audio Source"); + if (linkFunction("audio_source.gs3", (*functionCount)++)) return Status::ERROR; + } + + if ((functions & GadgetFunction::RNDIS) != 0) { + ALOGI("setCurrentUsbFunctions rndis"); + std::string rndisFunction = GetProperty(kVendorRndisConfig, ""); + if (rndisFunction != "") { + if (linkFunction(rndisFunction.c_str(), (*functionCount)++)) return Status::ERROR; + } else { + // link gsi.rndis for older pixel projects + if (linkFunction("gsi.rndis", (*functionCount)++)) return Status::ERROR; + } + } + + if ((functions & GadgetFunction::NCM) != 0) { + ALOGI("setCurrentUsbFunctions ncm"); + if (linkFunction("ncm.gs6", (*functionCount)++)) return Status::ERROR; + } + + return Status::SUCCESS; +} + +Status addAdb(MonitorFfs* monitorFfs, int* functionCount) { + ALOGI("setCurrentUsbFunctions Adb"); + if (!WriteStringToFile("1", DESC_USE_PATH)) + return Status::ERROR; + + if (!monitorFfs->addInotifyFd("/dev/usb-ffs/adb/")) return Status::ERROR; + + if (linkFunction("ffs.adb", (*functionCount)++)) return Status::ERROR; + monitorFfs->addEndPoint("/dev/usb-ffs/adb/ep1"); + monitorFfs->addEndPoint("/dev/usb-ffs/adb/ep2"); + ALOGI("Service started"); + return Status::SUCCESS; +} + +} // namespace gadget +} // namespace usb +} // namespace hardware +} // namespace android diff --git a/usb/lib/include/UsbGadgetCommon.h b/usb/lib/include/UsbGadgetCommon.h new file mode 100644 index 0000000..18b8101 --- /dev/null +++ b/usb/lib/include/UsbGadgetCommon.h @@ -0,0 +1,179 @@ +/* + * 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. + */ + +#ifndef HARDWARE_USB_USBGADGETCOMMON_H +#define HARDWARE_USB_USBGADGETCOMMON_H + +#include +#include +#include + +#include +#include + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +namespace android { +namespace hardware { +namespace usb { +namespace gadget { + +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 ::android::base::GetProperty; +using ::android::base::SetProperty; +using ::android::base::unique_fd; +using ::android::base::WriteStringToFile; +using ::android::hardware::usb::gadget::V1_0::Status; +using ::android::hardware::usb::gadget::V1_2::GadgetFunction; + +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 mWatchFd; + + // Maintains the list of Endpoints. + vector 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 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 gadget +} // namespace usb +} // namespace hardware +} // namespace android +#endif