1 files changed, 292 insertions, 0 deletions
diff --git a/src/platformsupport/input/evdevtablet/qevdevtablethandler.cpp b/src/platformsupport/input/evdevtablet/qevdevtablethandler.cpp
new file mode 100644
index 0000000000..aa87340112
--- /dev/null
+++ b/src/platformsupport/input/evdevtablet/qevdevtablethandler.cpp
@@ -0,0 +1,292 @@
+/****************************************************************************
+**
+** Copyright (C) 2015 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the plugins module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL21$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 or version 3 as published by the Free
+** Software Foundation and appearing in the file LICENSE.LGPLv21 and
+** LICENSE.LGPLv3 included in the packaging of this file. Please review the
+** following information to ensure the GNU Lesser General Public License
+** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** As a special exception, The Qt Company gives you certain additional
+** rights. These rights are described in The Qt Company LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qevdevtablethandler_p.h"
+
+#include <QStringList>
+#include <QSocketNotifier>
+#include <QGuiApplication>
+#include <QLoggingCategory>
+#include <QtCore/private/qcore_unix_p.h>
+#include <qpa/qwindowsysteminterface.h>
+#include <linux/input.h>
+
+QT_BEGIN_NAMESPACE
+
+Q_LOGGING_CATEGORY(qLcEvdevTablet, "qt.qpa.input")
+
+class QEvdevTabletData
+{
+public:
+    QEvdevTabletData(QEvdevTabletHandler *q_ptr);
+
+    void processInputEvent(input_event *ev);
+    void report();
+
+    QEvdevTabletHandler *q;
+    int lastEventType;
+    QString devName;
+    struct {
+        int x, y, p, d;
+    } minValues, maxValues;
+    struct {
+        int x, y, p, d;
+        bool down, lastReportDown;
+        int tool, lastReportTool;
+        QPointF lastReportPos;
+    } state;
+};
+
+QEvdevTabletData::QEvdevTabletData(QEvdevTabletHandler *q_ptr)
+    : q(q_ptr), lastEventType(0)
+{
+    memset(&minValues, 0, sizeof(minValues));
+    memset(&maxValues, 0, sizeof(maxValues));
+    memset(&state, 0, sizeof(state));
+}
+
+void QEvdevTabletData::processInputEvent(input_event *ev)
+{
+    if (ev->type == EV_ABS) {
+        switch (ev->code) {
+        case ABS_X:
+            state.x = ev->value;
+            break;
+        case ABS_Y:
+            state.y = ev->value;
+            break;
+        case ABS_PRESSURE:
+            state.p = ev->value;
+            break;
+        case ABS_DISTANCE:
+            state.d = ev->value;
+            break;
+        default:
+            break;
+        }
+    } else if (ev->type == EV_KEY) {
+        // code BTN_TOOL_* value 1 -> proximity enter
+        // code BTN_TOOL_* value 0 -> proximity leave
+        // code BTN_TOUCH value 1 -> contact with screen
+        // code BTN_TOUCH value 0 -> no contact
+        switch (ev->code) {
+        case BTN_TOUCH:
+            state.down = ev->value != 0;
+            break;
+        case BTN_TOOL_PEN:
+            state.tool = ev->value ? QTabletEvent::Pen : 0;
+            break;
+        case BTN_TOOL_RUBBER:
+            state.tool = ev->value ? QTabletEvent::Eraser : 0;
+            break;
+        default:
+            break;
+        }
+    } else if (ev->type == EV_SYN && ev->code == SYN_REPORT && lastEventType != ev->type) {
+        report();
+    }
+    lastEventType = ev->type;
+}
+
+void QEvdevTabletData::report()
+{
+    if (!state.lastReportTool && state.tool)
+        QWindowSystemInterface::handleTabletEnterProximityEvent(QTabletEvent::Stylus, state.tool, q->deviceId());
+
+    qreal nx = (state.x - minValues.x) / qreal(maxValues.x - minValues.x);
+    qreal ny = (state.y - minValues.y) / qreal(maxValues.y - minValues.y);
+
+    QRect winRect = QGuiApplication::primaryScreen()->geometry();
+    QPointF globalPos(nx * winRect.width(), ny * winRect.height());
+    int pointer = state.tool;
+    // Prevent sending confusing values of 0 when moving the pen outside the active area.
+    if (!state.down && state.lastReportDown) {
+        globalPos = state.lastReportPos;
+        pointer = state.lastReportTool;
+    }
+
+    int pressureRange = maxValues.p - minValues.p;
+    qreal pressure = pressureRange ? (state.p - minValues.p) / qreal(pressureRange) : qreal(1);
+
+    if (state.down || state.lastReportDown) {
+        QWindowSystemInterface::handleTabletEvent(0, state.down, QPointF(), globalPos,
+                                                  QTabletEvent::Stylus, pointer,
+                                                  pressure, 0, 0, 0, 0, 0, q->deviceId(), qGuiApp->keyboardModifiers());
+    }
+
+    if (state.lastReportTool && !state.tool)
+        QWindowSystemInterface::handleTabletLeaveProximityEvent(QTabletEvent::Stylus, state.tool, q->deviceId());
+
+    state.lastReportDown = state.down;
+    state.lastReportTool = state.tool;
+    state.lastReportPos = globalPos;
+}
+
+
+QEvdevTabletHandler::QEvdevTabletHandler(const QString &device, const QString &spec, QObject *parent)
+    : QObject(parent), m_fd(-1), m_device(device), m_notifier(0), d(0)
+{
+    Q_UNUSED(spec)
+
+    setObjectName(QLatin1String("Evdev Tablet Handler"));
+
+    qCDebug(qLcEvdevTablet, "evdevtablet: using %s", qPrintable(device));
+
+    m_fd = QT_OPEN(device.toLocal8Bit().constData(), O_RDONLY | O_NDELAY, 0);
+    if (m_fd < 0) {
+        qErrnoWarning(errno, "evdevtablet: Cannot open input device %s", qPrintable(device));
+        return;
+    }
+
+    bool grabSuccess = !ioctl(m_fd, EVIOCGRAB, (void *) 1);
+    if (grabSuccess)
+        ioctl(m_fd, EVIOCGRAB, (void *) 0);
+    else
+        qWarning("evdevtablet: %s: The device is grabbed by another process. No events will be read.", qPrintable(device));
+
+    d = new QEvdevTabletData(this);
+    if (!queryLimits())
+        qWarning("evdevtablet: %s: Unset or invalid ABS limits. Behavior will be unspecified.", qPrintable(device));
+
+    m_notifier = new QSocketNotifier(m_fd, QSocketNotifier::Read, this);
+    connect(m_notifier, &QSocketNotifier::activated, this, &QEvdevTabletHandler::readData);
+}
+
+QEvdevTabletHandler::~QEvdevTabletHandler()
+{
+    if (m_fd >= 0)
+        QT_CLOSE(m_fd);
+
+    delete d;
+}
+
+qint64 QEvdevTabletHandler::deviceId() const
+{
+    return m_fd;
+}
+
+bool QEvdevTabletHandler::queryLimits()
+{
+    bool ok = true;
+    input_absinfo absInfo;
+    memset(&absInfo, 0, sizeof(input_absinfo));
+    ok &= ioctl(m_fd, EVIOCGABS(ABS_X), &absInfo) >= 0;
+    if (ok) {
+        d->minValues.x = absInfo.minimum;
+        d->maxValues.x = absInfo.maximum;
+        qCDebug(qLcEvdevTablet, "evdevtablet: %s: min X: %d max X: %d", qPrintable(m_device),
+                d->minValues.x, d->maxValues.x);
+    }
+    ok &= ioctl(m_fd, EVIOCGABS(ABS_Y), &absInfo) >= 0;
+    if (ok) {
+        d->minValues.y = absInfo.minimum;
+        d->maxValues.y = absInfo.maximum;
+        qCDebug(qLcEvdevTablet, "evdevtablet: %s: min Y: %d max Y: %d", qPrintable(m_device),
+                d->minValues.y, d->maxValues.y);
+    }
+    if (ioctl(m_fd, EVIOCGABS(ABS_PRESSURE), &absInfo) >= 0) {
+        d->minValues.p = absInfo.minimum;
+        d->maxValues.p = absInfo.maximum;
+        qCDebug(qLcEvdevTablet, "evdevtablet: %s: min pressure: %d max pressure: %d", qPrintable(m_device),
+                d->minValues.p, d->maxValues.p);
+    }
+    if (ioctl(m_fd, EVIOCGABS(ABS_DISTANCE), &absInfo) >= 0) {
+        d->minValues.d = absInfo.minimum;
+        d->maxValues.d = absInfo.maximum;
+        qCDebug(qLcEvdevTablet, "evdevtablet: %s: min distance: %d max distance: %d", qPrintable(m_device),
+                d->minValues.d, d->maxValues.d);
+    }
+    char name[128];
+    if (ioctl(m_fd, EVIOCGNAME(sizeof(name) - 1), name) >= 0) {
+        d->devName = QString::fromLocal8Bit(name);
+        qCDebug(qLcEvdevTablet, "evdevtablet: %s: device name: %s", qPrintable(m_device), name);
+    }
+    return ok;
+}
+
+void QEvdevTabletHandler::readData()
+{
+    static input_event buffer[32];
+    int n = 0;
+    for (; ;) {
+        int result = QT_READ(m_fd, reinterpret_cast<char*>(buffer) + n, sizeof(buffer) - n);
+        if (!result) {
+            qWarning("evdevtablet: %s: Got EOF from input device", qPrintable(m_device));
+            return;
+        } else if (result < 0) {
+            if (errno != EINTR && errno != EAGAIN) {
+                qErrnoWarning(errno, "evdevtablet: %s: Could not read from input device", qPrintable(m_device));
+                if (errno == ENODEV) { // device got disconnected -> stop reading
+                    delete m_notifier;
+                    m_notifier = 0;
+                    QT_CLOSE(m_fd);
+                    m_fd = -1;
+                }
+                return;
+            }
+        } else {
+            n += result;
+            if (n % sizeof(input_event) == 0)
+                break;
+        }
+    }
+
+    n /= sizeof(input_event);
+
+    for (int i = 0; i < n; ++i)
+        d->processInputEvent(&buffer[i]);
+}
+
+
+QEvdevTabletHandlerThread::QEvdevTabletHandlerThread(const QString &device, const QString &spec, QObject *parent)
+    : QDaemonThread(parent), m_device(device), m_spec(spec), m_handler(0)
+{
+    start();
+}
+
+QEvdevTabletHandlerThread::~QEvdevTabletHandlerThread()
+{
+    quit();
+    wait();
+}
+
+void QEvdevTabletHandlerThread::run()
+{
+    m_handler = new QEvdevTabletHandler(m_device, m_spec);
+    exec();
+    delete m_handler;
+    m_handler = 0;
+}
+
+
+QT_END_NAMESPACE