New plugin: Add linux input device support

linuxinput/inputdevice.cpp

@@ -0,0 +1,155 @@
+#include "inputdevice.h"
+
+#include <QDir>
+#include <QDebug>
+#include <QFile>
+
+#include "extern-plugininfo.h"
+#include "inputdeviceeventmonitor.h"
+
+#include <libevdev/libevdev.h>
+
+#include <unistd.h>
+#include <fcntl.h>
+
+InputDevice::InputDevice(QObject *parent)
+    : QObject{parent}
+{
+
+}
+
+InputDevice::InputDevice(Info inputDeviceInfo, QObject *parent)
+    : QObject{parent},
+    m_inputDeviceInfo{inputDeviceInfo},
+    m_pollThread{new QThread(nullptr)}
+{
+    qCDebug(dcLinuxInput()) << "Constructing" << inputDeviceInfo;
+    InputDeviceEventMonitor *monitor = new InputDeviceEventMonitor(inputDeviceInfo.eventFilePath, nullptr);
+    monitor->moveToThread(m_pollThread);
+
+    connect(m_pollThread, &QThread::started, monitor, &InputDeviceEventMonitor::process);
+    connect(monitor, &InputDeviceEventMonitor::finished, m_pollThread, &QThread::quit);
+    connect(monitor, &InputDeviceEventMonitor::finished, monitor, &InputDeviceEventMonitor::deleteLater);
+    connect(m_pollThread, &QThread::finished, monitor, &InputDeviceEventMonitor::deleteLater);
+    connect(m_pollThread, &QThread::finished, m_pollThread, [this](){
+        qCDebug(dcLinuxInput()) << "Monitoring thread finished" << m_inputDeviceInfo;
+        m_pollThread->deleteLater();
+        m_pollThread = nullptr;
+    });
+
+    connect(monitor, &InputDeviceEventMonitor::eventOccurred, this, &InputDevice::onEventOccurred);
+
+    qCDebug(dcLinuxInput()) << "Start monitoring" << inputDeviceInfo;
+    m_pollThread->start();
+}
+
+InputDevice::~InputDevice()
+{
+    if (m_pollThread) {
+        m_pollThread->terminate();
+    }
+}
+
+InputDevice::Info InputDevice::inputDeviceInfo() const
+{
+    return m_inputDeviceInfo;
+}
+
+QList<InputDevice::Info> InputDevice::availableInputDevices()
+{
+    QList<Info> inputeDevices;
+    QStringList addedInputIds;
+    QDir inputByIdDir("/dev/input/by-path/");
+
+    // Get the keyboards
+    qCDebug(dcLinuxInput()) << "---------- Keyboards:";
+    foreach (const QString &inputIdName, inputByIdDir.entryList({"*event-kbd"}, QDir::Dirs | QDir::NoDotAndDotDot)) {
+        Info info = parseDeviceInfo(Keyboard, QFileInfo(inputByIdDir.absolutePath() + QDir::separator() + inputIdName));
+        qCDebug(dcLinuxInput()) << " --> " << info;
+        inputeDevices.append(info);
+        addedInputIds.append(inputIdName);
+    }
+
+    qCDebug(dcLinuxInput()) << "---------- Mouse:";
+    foreach (const QString &inputIdName, inputByIdDir.entryList({"*event-mouse"}, QDir::Dirs | QDir::NoDotAndDotDot)) {
+        Info info = parseDeviceInfo(Mouse, QFileInfo(inputByIdDir.absolutePath() + QDir::separator() + inputIdName));
+        qCDebug(dcLinuxInput()) << " --> " << info;
+        inputeDevices.append(info);
+        addedInputIds.append(inputIdName);
+    }
+
+    qCDebug(dcLinuxInput()) << "---------- Other:";
+    foreach (const QString &inputIdName, inputByIdDir.entryList(QDir::Dirs | QDir::NoDotAndDotDot)) {
+        if (addedInputIds.contains(inputIdName))
+            continue;
+
+        Info info = parseDeviceInfo(Other, QFileInfo(inputByIdDir.absolutePath() + QDir::separator() + inputIdName));
+        qCDebug(dcLinuxInput()) << " --> " << info;
+        inputeDevices.append(info);
+        addedInputIds.append(inputIdName);
+    }
+
+    return inputeDevices;
+}
+
+void InputDevice::onEventOccurred(quint16 type, quint16 code, qint32 value)
+{
+    if (type != EV_KEY)
+        return;
+
+    qCDebug(dcLinuxInput()) << "Event occurred" << type << code << value;
+    emit keyPressed(code, value);
+}
+
+QString InputDevice::readFileContent(const QString &fileName)
+{
+    QFile file(fileName);
+    if (!file.open(QIODevice::ReadOnly | QIODevice::Text)) {
+        qCWarning(dcLinuxInput()) << "Could not open file" << fileName << ":"  << file.errorString();
+        return QString();
+    }
+
+    QString content;
+    QTextStream in(&file);
+    content = in.readAll();
+    file.close();
+
+    return content.trimmed();
+}
+
+InputDevice::Info InputDevice::parseDeviceInfo(Type type, const QFileInfo &inputLinkFileInfo)
+{
+    QFileInfo inputFileInfo(inputLinkFileInfo.symLinkTarget());
+
+    QDir inputsDir("/sys/class/input/");
+    QDir inputDir(inputsDir.absolutePath() + QDir::separator() + inputFileInfo.baseName() + QDir::separator() + "device");
+
+    Info info;
+    info.type = type;
+    info.id = QString(inputFileInfo.baseName()).remove("event").toInt();
+    info.name = readFileContent(inputDir.absolutePath() + QDir::separator() + "name");
+    info.phys = readFileContent(inputDir.absolutePath() + QDir::separator() + "phys");
+    info.eventFilePath = inputLinkFileInfo.symLinkTarget();
+
+    return info;
+}
+
+QDebug operator<<(QDebug debug, InputDevice::Info inputDeviceInfo)
+{
+    QDebugStateSaver saver(debug);
+    debug.nospace() << "Info(" << inputDeviceInfo.type
+                    << ", name: " << inputDeviceInfo.name
+                    << ", Phys: " << inputDeviceInfo.phys
+                    << ", " << inputDeviceInfo.eventFilePath
+                    << ')';
+    return debug;
+}
+
+QDebug operator<<(QDebug debug, InputDevice *inputDevice)
+{
+    QDebugStateSaver saver(debug);
+    debug.nospace() << "InputDevice(" << inputDevice->inputDeviceInfo() << ')';
+    return debug;
+}
+
+

linuxinput/inputdevice.h

@@ -0,0 +1,60 @@
+#ifndef INPUTDEVICE_H
+#define INPUTDEVICE_H
+
+#include <QDir>
+#include <QDebug>
+#include <QObject>
+#include <QThread>
+
+#include <linux/input-event-codes.h>
+#include <linux/input.h>
+
+class InputDevice : public QObject
+{
+    Q_OBJECT
+public:
+    enum Type {
+        Unknown,
+        Keyboard,
+        Mouse,
+        Other
+    };
+    Q_ENUM(Type)
+
+    typedef struct Info {
+        int id = -1;
+        Type type = Unknown;
+        QString name;
+        QString description;
+        QString phys;
+        QString eventFilePath;
+    } InputDeviceInfo;
+
+    explicit InputDevice(QObject *parent = nullptr);
+    explicit InputDevice(Info inputDeviceInfo, QObject *parent = nullptr);
+    ~InputDevice();
+
+    InputDevice::Info inputDeviceInfo() const;
+
+    static QList<InputDevice::Info> availableInputDevices();
+
+signals:
+    void keyPressed(quint16 code, qint32 value);
+
+private slots:
+    void onEventOccurred(quint16 type, quint16 code, qint32 value);
+
+private:
+    QString m_eventFileName;
+    static QString readFileContent(const QString &fileName);
+    Info m_inputDeviceInfo;
+    QThread *m_pollThread = nullptr;
+
+    static InputDevice::Info parseDeviceInfo(Type type, const QFileInfo &inputLinkFileInfo);
+};
+
+QDebug operator<<(QDebug debug, InputDevice::Info inputDeviceInfo);
+QDebug operator<<(QDebug debug, InputDevice *inputDevice);
+
+
+#endif // INPUTDEVICE_H

linuxinput/inputdeviceeventmonitor.cpp

@@ -0,0 +1,62 @@
+#include "inputdeviceeventmonitor.h"
+#include "extern-plugininfo.h"
+
+#include <QFile>
+#include <QDebug>
+
+#include <fcntl.h>
+#include <unistd.h>
+#include <libevdev/libevdev.h>
+
+InputDeviceEventMonitor::InputDeviceEventMonitor(const QString &fileName, QObject *parent)
+    : QObject{parent},
+    m_fileName{fileName}
+{
+
+}
+
+void InputDeviceEventMonitor::process()
+{
+    struct libevdev *device = nullptr;
+
+    int fd = open(m_fileName.toStdString().c_str(), O_RDWR|O_CLOEXEC);
+    if (fd < 0) {
+        qCWarning(dcLinuxInput()) << "Could not open file" << m_fileName;
+        emit finished();
+        return;
+    }
+
+    int status = libevdev_new_from_fd(fd, &device);
+    if (status != 0) {
+        qCWarning(dcLinuxInput()) << "Failed to create evdev from file descriptor";
+        close(fd);
+        emit finished();
+        return;
+    }
+
+    qCDebug(dcLinuxInput()) << "Start monitoring events on" << m_fileName;
+    qCDebug(dcLinuxInput()) << "- name: " << libevdev_get_name(device);
+    qCDebug(dcLinuxInput()) << "- phys: " << libevdev_get_phys(device);
+
+    struct input_event event = {};
+    auto hasError = [](int v) {
+        return v < 0 && v != -EAGAIN;
+    };
+    auto hasNextEvent = [](int v) {
+        return v >= 0;
+    };
+
+    while (status = libevdev_next_event(device, LIBEVDEV_READ_FLAG_NORMAL | LIBEVDEV_READ_FLAG_BLOCKING, &event), !hasError(status)) {
+        if (!hasNextEvent(status))
+            continue;
+
+        emit eventOccurred(event.type, event.code, event.value);
+    }
+
+    libevdev_free(device);
+    device = nullptr;
+
+    close(fd);
+
+    emit finished();
+}

linuxinput/inputdeviceeventmonitor.h

@@ -0,0 +1,24 @@
+#ifndef INPUTDEVICEEVENTMONITOR_H
+#define INPUTDEVICEEVENTMONITOR_H
+
+#include <QObject>
+
+class InputDeviceEventMonitor : public QObject
+{
+    Q_OBJECT
+public:
+    explicit InputDeviceEventMonitor(const QString &fileName, QObject *parent = nullptr);
+
+public slots:
+    void process();
+
+signals:
+    void eventOccurred(quint16 type, quint16 code, qint32 value);
+    void finished();
+
+private:
+    QString m_fileName;
+
+};
+
+#endif // INPUTDEVICEEVENTMONITOR_H

nymea-plugins.pro

@@ -37,6 +37,7 @@ PLUGIN_DIRS = \
     kodi                \
     lgsmarttv           \
     lifx                \
+    linuxinput          \
     logilink            \
     mecelectronics      \
     meross              \