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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#include "qdevicediscovery_static_p.h"
#include <QStringList>
#include <QCoreApplication>
#include <QObject>
#include <QHash>
#include <QDir>
#include <QLoggingCategory>
#include <QtCore/private/qcore_unix_p.h>
#ifdef Q_OS_FREEBSD
#include <dev/evdev/input.h>
#else
#include <linux/input.h>
#endif
#include <fcntl.h>
/* android (and perhaps some other linux-derived stuff) don't define everything
* in linux/input.h, so we'll need to do that ourselves.
*/
#ifndef KEY_CNT
#define KEY_CNT (KEY_MAX+1)
#endif
#ifndef REL_CNT
#define REL_CNT (REL_MAX+1)
#endif
#ifndef ABS_CNT
#define ABS_CNT (ABS_MAX+1)
#endif
#ifndef ABS_MT_POSITION_X
#define ABS_MT_POSITION_X 0x35
#endif
#ifndef ABS_MT_POSITION_Y
#define ABS_MT_POSITION_Y 0x36
#endif
#define LONG_BITS (sizeof(long) * 8 )
#define LONG_FIELD_SIZE(bits) ((bits / LONG_BITS) + 1)
static bool testBit(long bit, const long *field)
{
return (field[bit / LONG_BITS] >> bit % LONG_BITS) & 1;
}
QT_BEGIN_NAMESPACE
using namespace Qt::StringLiterals;
Q_LOGGING_CATEGORY(lcDD, "qt.qpa.input")
QDeviceDiscovery *QDeviceDiscovery::create(QDeviceTypes types, QObject *parent)
{
return new QDeviceDiscoveryStatic(types, parent);
}
QDeviceDiscoveryStatic::QDeviceDiscoveryStatic(QDeviceTypes types, QObject *parent)
: QDeviceDiscovery(types, parent)
{
qCDebug(lcDD) << "static device discovery for type" << types;
}
QStringList QDeviceDiscoveryStatic::scanConnectedDevices()
{
QStringList devices;
QDir dir;
dir.setFilter(QDir::System);
// check for input devices
if (m_types & Device_InputMask) {
dir.setPath(QString::fromLatin1(QT_EVDEV_DEVICE_PATH));
const auto deviceFiles = dir.entryList();
for (const QString &deviceFile : deviceFiles) {
QString absoluteFilePath = dir.absolutePath() + u'/' + deviceFile;
if (checkDeviceType(absoluteFilePath))
devices << absoluteFilePath;
}
}
// check for drm devices
if (m_types & Device_VideoMask) {
dir.setPath(QString::fromLatin1(QT_DRM_DEVICE_PATH));
const auto deviceFiles = dir.entryList();
for (const QString &deviceFile : deviceFiles) {
QString absoluteFilePath = dir.absolutePath() + u'/' + deviceFile;
if (checkDeviceType(absoluteFilePath))
devices << absoluteFilePath;
}
}
qCDebug(lcDD) << "Found matching devices" << devices;
return devices;
}
bool QDeviceDiscoveryStatic::checkDeviceType(const QString &device)
{
int fd = QT_OPEN(device.toLocal8Bit().constData(), O_RDONLY | O_NDELAY, 0);
if (Q_UNLIKELY(fd == -1)) {
qWarning() << "Device discovery cannot open device" << device;
return false;
}
qCDebug(lcDD) << "doing static device discovery for " << device;
if ((m_types & Device_DRM) && device.contains(QT_DRM_DEVICE_PREFIX ""_L1)) {
QT_CLOSE(fd);
return true;
}
long bitsAbs[LONG_FIELD_SIZE(ABS_CNT)];
long bitsKey[LONG_FIELD_SIZE(KEY_CNT)];
long bitsRel[LONG_FIELD_SIZE(REL_CNT)];
memset(bitsAbs, 0, sizeof(bitsAbs));
memset(bitsKey, 0, sizeof(bitsKey));
memset(bitsRel, 0, sizeof(bitsRel));
ioctl(fd, EVIOCGBIT(EV_ABS, sizeof(bitsAbs)), bitsAbs);
ioctl(fd, EVIOCGBIT(EV_KEY, sizeof(bitsKey)), bitsKey);
ioctl(fd, EVIOCGBIT(EV_REL, sizeof(bitsRel)), bitsRel);
QT_CLOSE(fd);
if ((m_types & Device_Keyboard)) {
if (testBit(KEY_Q, bitsKey)) {
qCDebug(lcDD) << "Found keyboard at" << device;
return true;
}
}
if ((m_types & Device_Mouse)) {
if (testBit(REL_X, bitsRel) && testBit(REL_Y, bitsRel) && testBit(BTN_MOUSE, bitsKey)) {
qCDebug(lcDD) << "Found mouse at" << device;
return true;
}
}
if ((m_types & (Device_Touchpad | Device_Touchscreen))) {
if (testBit(ABS_X, bitsAbs) && testBit(ABS_Y, bitsAbs)) {
if ((m_types & Device_Touchpad) && testBit(BTN_TOOL_FINGER, bitsKey)) {
qCDebug(lcDD) << "Found touchpad at" << device;
return true;
} else if ((m_types & Device_Touchscreen) && testBit(BTN_TOUCH, bitsKey)) {
qCDebug(lcDD) << "Found touchscreen at" << device;
return true;
} else if ((m_types & Device_Tablet) && (testBit(BTN_STYLUS, bitsKey) || testBit(BTN_TOOL_PEN, bitsKey))) {
qCDebug(lcDD) << "Found tablet at" << device;
return true;
}
} else if (testBit(ABS_MT_POSITION_X, bitsAbs) &&
testBit(ABS_MT_POSITION_Y, bitsAbs)) {
qCDebug(lcDD) << "Found new-style touchscreen at" << device;
return true;
}
}
if ((m_types & Device_Joystick)) {
if (testBit(BTN_A, bitsKey) || testBit(BTN_TRIGGER, bitsKey) || testBit(ABS_RX, bitsAbs)) {
qCDebug(lcDD) << "Found joystick/gamepad at" << device;
return true;
}
}
return false;
}
QT_END_NAMESPACE
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