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/*
* Copyright (C) 2015 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 "InputDevice"
#define LOG_NDEBUG 0
#include <linux/input.h>
#define __STDC_FORMAT_MACROS
#include <cinttypes>
#include <string>
#include <utils/Log.h>
#include <utils/Timers.h>
#include "InputHub.h"
#include "InputDevice.h"
#define MSC_ANDROID_TIME_SEC 0x6
#define MSC_ANDROID_TIME_USEC 0x7
namespace android {
EvdevDevice::EvdevDevice(std::shared_ptr<InputDeviceNode> node) :
mDeviceNode(node) {}
void EvdevDevice::processInput(InputEvent& event, nsecs_t currentTime) {
std::string log;
log.append("---InputEvent for device %s---\n");
log.append(" when: %" PRId64 "\n");
log.append(" type: %d\n");
log.append(" code: %d\n");
log.append(" value: %d\n");
ALOGV(log.c_str(), mDeviceNode->getPath().c_str(), event.when, event.type, event.code,
event.value);
if (event.type == EV_MSC) {
if (event.code == MSC_ANDROID_TIME_SEC) {
mOverrideSec = event.value;
} else if (event.code == MSC_ANDROID_TIME_USEC) {
mOverrideUsec = event.value;
}
return;
}
if (mOverrideSec || mOverrideUsec) {
event.when = s2ns(mOverrideSec) + us2ns(mOverrideUsec);
ALOGV("applied override time %d.%06d", mOverrideSec, mOverrideUsec);
if (event.type == EV_SYN && event.code == SYN_REPORT) {
mOverrideSec = 0;
mOverrideUsec = 0;
}
}
// Bug 7291243: Add a guard in case the kernel generates timestamps
// that appear to be far into the future because they were generated
// using the wrong clock source.
//
// This can happen because when the input device is initially opened
// it has a default clock source of CLOCK_REALTIME. Any input events
// enqueued right after the device is opened will have timestamps
// generated using CLOCK_REALTIME. We later set the clock source
// to CLOCK_MONOTONIC but it is already too late.
//
// Invalid input event timestamps can result in ANRs, crashes and
// and other issues that are hard to track down. We must not let them
// propagate through the system.
//
// Log a warning so that we notice the problem and recover gracefully.
if (event.when >= currentTime + s2ns(10)) {
// Double-check. Time may have moved on.
auto time = systemTime(SYSTEM_TIME_MONOTONIC);
if (event.when > time) {
ALOGW("An input event from %s has a timestamp that appears to have "
"been generated using the wrong clock source (expected "
"CLOCK_MONOTONIC): event time %" PRId64 ", current time %" PRId64
", call time %" PRId64 ". Using current time instead.",
mDeviceNode->getPath().c_str(), event.when, time, currentTime);
event.when = time;
} else {
ALOGV("Event time is ok but failed the fast path and required an extra "
"call to systemTime: event time %" PRId64 ", current time %" PRId64
", call time %" PRId64 ".", event.when, time, currentTime);
}
}
}
} // namespace android
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