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74 lines
2.0 KiB
74 lines
2.0 KiB
4 months ago
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/*
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* Copyright (C) 2018 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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#include "inputsource.h"
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#include "defines.h"
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#include <utils/Log.h>
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#include <fcntl.h>
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#include <sstream>
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#include <string.h>
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#include <unistd.h>
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using namespace com::android::car::keventreader;
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InputSource::kevent::kevent() {
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bzero(this, sizeof(*this));
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}
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bool InputSource::kevent::isKeypress() const {
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return type == EV_KEY;
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}
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bool InputSource::kevent::isKeydown() const {
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return isKeypress() && (value == 1);
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}
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bool InputSource::kevent::isKeyup() const {
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return isKeypress() && (value == 0);
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}
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InputSource::InputSource(const char* file) : mFilePath(file), mDescriptor(open(file, O_RDONLY)) {}
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InputSource::operator bool() const {
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return descriptor() >= 0;
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}
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int InputSource::descriptor() const {
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return mDescriptor;
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}
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std::optional<com::android::car::keventreader::KeypressEvent> InputSource::read() const {
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kevent evt;
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auto cnt = ::read(mDescriptor, &evt, sizeof(evt));
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// the kernel guarantees that we will always be able to read a whole number of events
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if (cnt < static_cast<decltype(cnt)>(sizeof(evt))) {
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return std::nullopt;
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}
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if (!evt.isKeypress()) {
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return std::nullopt;
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}
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ALOGD("input source %s generated code %u (down = %s)",
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mFilePath.c_str(), evt.code, evt.isKeydown() ? "true" : "false");
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return com::android::car::keventreader::KeypressEvent(mFilePath, evt.code, evt.isKeydown());
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}
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InputSource::~InputSource() {
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if (mDescriptor) ::close(mDescriptor);
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}
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