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/*
* Copyright (C) 2023 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.
*/
#pragma once
#include <aidl/android/hardware/usb/ComplianceWarning.h>
#include <aidl/android/hardware/usb/PortDataRole.h>
#include <android-base/chrono_utils.h>
#include <android-base/unique_fd.h>
#include <set>
#include <string>
#include <vector>
namespace aidl {
namespace android {
namespace hardware {
namespace usb {
using ::aidl::android::hardware::usb::ComplianceWarning;
using ::aidl::android::hardware::usb::PortDataRole;
using ::android::base::boot_clock;
using ::android::base::unique_fd;
/*
* UsbDataSessionMonitor monitors the usb device state sysfs of 3 different usb devices
* including device mode (udc), host mode high-speed port and host mode super-speed port. It
* reports Suez metrics for each data session and also provides API to query the compliance
* warnings detected in the current usb data session.
*/
class UsbDataSessionMonitor {
public:
/*
* The host mode high-speed port and super-speed port can be assigned to either host1 or
* host2 without affecting functionality.
*
* UeventRegex: name regex of the device that's being monitored. The regex is matched against
* uevent to detect dynamic creation/deletion/change of the device.
* StatePath: usb device state sysfs path of the device, monitored by epoll.
* dataRolePath: path to the usb data role sysfs, monitored by epoll.
* updatePortStatusCb: the callback is invoked when the compliance warings changes.
*/
UsbDataSessionMonitor(const std::string &deviceUeventRegex, const std::string &deviceStatePath,
const std::string &host1UeventRegex, const std::string &host1StatePath,
const std::string &host2UeventRegex, const std::string &host2StatePath,
const std::string &dataRolePath,
std::function<void()> updatePortStatusCb);
~UsbDataSessionMonitor();
// Returns the compliance warnings detected in the current data session.
void getComplianceWarnings(const PortDataRole &role, std::vector<ComplianceWarning> *warnings);
private:
struct usbDeviceState {
unique_fd fd;
std::string filePath;
std::string ueventRegex;
// Usb device states reported by state sysfs
std::vector<std::string> states;
// Timestamps of when the usb device states were captured
std::vector<boot_clock::time_point> timestamps;
};
static void *monitorThread(void *param);
void handleUevent();
void handleDataRoleEvent();
void handleDeviceStateEvent(struct usbDeviceState *deviceState);
void clearDeviceStateEvents(struct usbDeviceState *deviceState);
void reportUsbDataSessionMetrics();
void evaluateComplianceWarning();
void notifyComplianceWarning();
void updateUdcBindStatus(const std::string &devname);
pthread_t mMonitor;
unique_fd mEpollFd;
unique_fd mUeventFd;
unique_fd mDataRoleFd;
struct usbDeviceState mDeviceState;
struct usbDeviceState mHost1State;
struct usbDeviceState mHost2State;
std::set<ComplianceWarning> mWarningSet;
// Callback function to notify the caller when there's a change in compliance warnings.
std::function<void()> mUpdatePortStatusCb;
/*
* Cache relevant info for a USB data session when one starts, including
* the data role and the time when the session starts.
*/
PortDataRole mDataRole;
boot_clock::time_point mDataSessionStart;
/*
* In gadget mode: this indicates whether the udc device is bound to the configfs driver, which
* is done by userspace writing the udc device name to /config/usb_gadget/g1/UDC. When unbound,
* the gadget is in soft pulldown state and is expected not to enumerate. During gadget
* function switch, the udc device usually go through unbind and bind.
*/
bool mUdcBind;
};
} // namespace usb
} // namespace hardware
} // namespace android
} // namespace aidl
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