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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_udev_p.h"
#include <QStringList>
#include <QCoreApplication>
#include <QObject>
#include <QHash>
#include <QSocketNotifier>
#include <QLoggingCategory>
#ifdef Q_OS_FREEBSD
#include <dev/evdev/input.h>
#else
#include <linux/input.h>
#endif
QT_BEGIN_NAMESPACE
using namespace Qt::StringLiterals;
Q_LOGGING_CATEGORY(lcDD, "qt.qpa.input")
QDeviceDiscovery *QDeviceDiscovery::create(QDeviceTypes types, QObject *parent)
{
qCDebug(lcDD) << "udev device discovery for type" << types;
QDeviceDiscovery *helper = nullptr;
struct udev *udev;
udev = udev_new();
if (udev) {
helper = new QDeviceDiscoveryUDev(types, udev, parent);
} else {
qWarning("Failed to get udev library context");
}
return helper;
}
QDeviceDiscoveryUDev::QDeviceDiscoveryUDev(QDeviceTypes types, struct udev *udev, QObject *parent) :
QDeviceDiscovery(types, parent),
m_udev(udev)
{
if (!m_udev)
return;
m_udevMonitor = udev_monitor_new_from_netlink(m_udev, "udev");
if (!m_udevMonitor) {
qWarning("Unable to create an udev monitor. No devices can be detected.");
return;
}
udev_monitor_filter_add_match_subsystem_devtype(m_udevMonitor, "input", 0);
udev_monitor_filter_add_match_subsystem_devtype(m_udevMonitor, "drm", 0);
udev_monitor_enable_receiving(m_udevMonitor);
m_udevMonitorFileDescriptor = udev_monitor_get_fd(m_udevMonitor);
m_udevSocketNotifier = new QSocketNotifier(m_udevMonitorFileDescriptor, QSocketNotifier::Read, this);
connect(m_udevSocketNotifier, SIGNAL(activated(QSocketDescriptor)), this, SLOT(handleUDevNotification()));
}
QDeviceDiscoveryUDev::~QDeviceDiscoveryUDev()
{
if (m_udevMonitor)
udev_monitor_unref(m_udevMonitor);
if (m_udev)
udev_unref(m_udev);
}
QStringList QDeviceDiscoveryUDev::scanConnectedDevices()
{
QStringList devices;
if (!m_udev)
return devices;
udev_enumerate *ue = udev_enumerate_new(m_udev);
udev_enumerate_add_match_subsystem(ue, "input");
udev_enumerate_add_match_subsystem(ue, "drm");
if (m_types & Device_Mouse)
udev_enumerate_add_match_property(ue, "ID_INPUT_MOUSE", "1");
if (m_types & Device_Touchpad)
udev_enumerate_add_match_property(ue, "ID_INPUT_TOUCHPAD", "1");
if (m_types & Device_Touchscreen)
udev_enumerate_add_match_property(ue, "ID_INPUT_TOUCHSCREEN", "1");
if (m_types & Device_Keyboard) {
udev_enumerate_add_match_property(ue, "ID_INPUT_KEYBOARD", "1");
udev_enumerate_add_match_property(ue, "ID_INPUT_KEY", "1");
}
if (m_types & Device_Tablet)
udev_enumerate_add_match_property(ue, "ID_INPUT_TABLET", "1");
if (m_types & Device_Joystick)
udev_enumerate_add_match_property(ue, "ID_INPUT_JOYSTICK", "1");
if (udev_enumerate_scan_devices(ue) != 0) {
qWarning("Failed to scan devices");
return devices;
}
udev_list_entry *entry;
udev_list_entry_foreach (entry, udev_enumerate_get_list_entry(ue)) {
const char *syspath = udev_list_entry_get_name(entry);
udev_device *udevice = udev_device_new_from_syspath(m_udev, syspath);
QString candidate = QString::fromUtf8(udev_device_get_devnode(udevice));
if ((m_types & Device_InputMask) && candidate.startsWith(QT_EVDEV_DEVICE ""_L1))
devices << candidate;
if ((m_types & Device_VideoMask) && candidate.startsWith(QT_DRM_DEVICE ""_L1)) {
if (m_types & Device_DRM_PrimaryGPU) {
udev_device *pci = udev_device_get_parent_with_subsystem_devtype(udevice, "pci", 0);
if (pci) {
if (qstrcmp(udev_device_get_sysattr_value(pci, "boot_vga"), "1") == 0)
devices << candidate;
}
} else
devices << candidate;
}
udev_device_unref(udevice);
}
udev_enumerate_unref(ue);
qCDebug(lcDD) << "Found matching devices" << devices;
return devices;
}
void QDeviceDiscoveryUDev::handleUDevNotification()
{
if (!m_udevMonitor)
return;
struct udev_device *dev;
QString devNode;
dev = udev_monitor_receive_device(m_udevMonitor);
if (!dev)
goto cleanup;
const char *action;
action = udev_device_get_action(dev);
if (!action)
goto cleanup;
const char *str;
str = udev_device_get_devnode(dev);
if (!str)
goto cleanup;
const char *subsystem;
devNode = QString::fromUtf8(str);
if (devNode.startsWith(QT_EVDEV_DEVICE ""_L1))
subsystem = "input";
else if (devNode.startsWith(QT_DRM_DEVICE ""_L1))
subsystem = "drm";
else goto cleanup;
// if we cannot determine a type, walk up the device tree
if (!checkDeviceType(dev)) {
// does not increase the refcount
struct udev_device *parent_dev = udev_device_get_parent_with_subsystem_devtype(dev, subsystem, 0);
if (!parent_dev)
goto cleanup;
if (!checkDeviceType(parent_dev))
goto cleanup;
}
if (qstrcmp(action, "add") == 0)
emit deviceDetected(devNode);
if (qstrcmp(action, "remove") == 0)
emit deviceRemoved(devNode);
cleanup:
udev_device_unref(dev);
}
bool QDeviceDiscoveryUDev::checkDeviceType(udev_device *dev)
{
if (!dev)
return false;
if ((m_types & Device_Keyboard) && (qstrcmp(udev_device_get_property_value(dev, "ID_INPUT_KEYBOARD"), "1") == 0 )) {
const QString capabilities_key = QString::fromUtf8(udev_device_get_sysattr_value(dev, "capabilities/key"));
const auto val = QStringView{capabilities_key}.split(u' ', Qt::SkipEmptyParts);
if (!val.isEmpty()) {
bool ok;
unsigned long long keys = val.last().toULongLong(&ok, 16);
if (ok) {
// Tests if the letter Q is valid for the device. We may want to alter this test, but it seems mostly reliable.
bool test = (keys >> KEY_Q) & 1;
if (test)
return true;
}
}
}
if ((m_types & Device_Keyboard) && (qstrcmp(udev_device_get_property_value(dev, "ID_INPUT_KEY"), "1") == 0 ))
return true;
if ((m_types & Device_Mouse) && (qstrcmp(udev_device_get_property_value(dev, "ID_INPUT_MOUSE"), "1") == 0))
return true;
if ((m_types & Device_Touchpad) && (qstrcmp(udev_device_get_property_value(dev, "ID_INPUT_TOUCHPAD"), "1") == 0))
return true;
if ((m_types & Device_Touchscreen) && (qstrcmp(udev_device_get_property_value(dev, "ID_INPUT_TOUCHSCREEN"), "1") == 0))
return true;
if ((m_types & Device_Tablet) && (qstrcmp(udev_device_get_property_value(dev, "ID_INPUT_TABLET"), "1") == 0))
return true;
if ((m_types & Device_Joystick) && (qstrcmp(udev_device_get_property_value(dev, "ID_INPUT_JOYSTICK"), "1") == 0))
return true;
if ((m_types & Device_DRM) && (qstrcmp(udev_device_get_subsystem(dev), "drm") == 0))
return true;
return false;
}
QT_END_NAMESPACE
#include "moc_qdevicediscovery_udev_p.cpp"
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