229 lines
7.1 KiB
C++
229 lines
7.1 KiB
C++
// Copyright (C) 2016 The Qt Company Ltd.
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// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
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#include "qdevicediscovery_udev_p.h"
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#include <QStringList>
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#include <QCoreApplication>
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#include <QObject>
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#include <QHash>
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#include <QSocketNotifier>
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#include <QLoggingCategory>
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#ifdef Q_OS_FREEBSD
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#include <dev/evdev/input.h>
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#else
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#include <linux/input.h>
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#endif
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QT_BEGIN_NAMESPACE
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using namespace Qt::StringLiterals;
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Q_LOGGING_CATEGORY(lcDD, "qt.qpa.input")
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QDeviceDiscovery *QDeviceDiscovery::create(QDeviceTypes types, QObject *parent)
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{
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qCDebug(lcDD) << "udev device discovery for type" << types;
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QDeviceDiscovery *helper = nullptr;
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struct udev *udev;
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udev = udev_new();
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if (udev) {
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helper = new QDeviceDiscoveryUDev(types, udev, parent);
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} else {
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qWarning("Failed to get udev library context");
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}
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return helper;
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}
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QDeviceDiscoveryUDev::QDeviceDiscoveryUDev(QDeviceTypes types, struct udev *udev, QObject *parent) :
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QDeviceDiscovery(types, parent),
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m_udev(udev)
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{
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if (!m_udev)
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return;
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m_udevMonitor = udev_monitor_new_from_netlink(m_udev, "udev");
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if (!m_udevMonitor) {
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qWarning("Unable to create an udev monitor. No devices can be detected.");
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return;
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}
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udev_monitor_filter_add_match_subsystem_devtype(m_udevMonitor, "input", 0);
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udev_monitor_filter_add_match_subsystem_devtype(m_udevMonitor, "drm", 0);
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udev_monitor_enable_receiving(m_udevMonitor);
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m_udevMonitorFileDescriptor = udev_monitor_get_fd(m_udevMonitor);
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m_udevSocketNotifier = new QSocketNotifier(m_udevMonitorFileDescriptor, QSocketNotifier::Read, this);
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connect(m_udevSocketNotifier, SIGNAL(activated(QSocketDescriptor)), this, SLOT(handleUDevNotification()));
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}
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QDeviceDiscoveryUDev::~QDeviceDiscoveryUDev()
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{
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if (m_udevMonitor)
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udev_monitor_unref(m_udevMonitor);
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if (m_udev)
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udev_unref(m_udev);
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}
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QStringList QDeviceDiscoveryUDev::scanConnectedDevices()
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{
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QStringList devices;
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if (!m_udev)
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return devices;
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udev_enumerate *ue = udev_enumerate_new(m_udev);
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udev_enumerate_add_match_subsystem(ue, "input");
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udev_enumerate_add_match_subsystem(ue, "drm");
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if (m_types & Device_Mouse)
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udev_enumerate_add_match_property(ue, "ID_INPUT_MOUSE", "1");
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if (m_types & Device_Touchpad)
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udev_enumerate_add_match_property(ue, "ID_INPUT_TOUCHPAD", "1");
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if (m_types & Device_Touchscreen)
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udev_enumerate_add_match_property(ue, "ID_INPUT_TOUCHSCREEN", "1");
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if (m_types & Device_Keyboard) {
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udev_enumerate_add_match_property(ue, "ID_INPUT_KEYBOARD", "1");
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udev_enumerate_add_match_property(ue, "ID_INPUT_KEY", "1");
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}
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if (m_types & Device_Tablet)
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udev_enumerate_add_match_property(ue, "ID_INPUT_TABLET", "1");
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if (m_types & Device_Joystick)
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udev_enumerate_add_match_property(ue, "ID_INPUT_JOYSTICK", "1");
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if (udev_enumerate_scan_devices(ue) != 0) {
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qWarning("Failed to scan devices");
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return devices;
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}
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udev_list_entry *entry;
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udev_list_entry_foreach (entry, udev_enumerate_get_list_entry(ue)) {
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const char *syspath = udev_list_entry_get_name(entry);
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udev_device *udevice = udev_device_new_from_syspath(m_udev, syspath);
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QString candidate = QString::fromUtf8(udev_device_get_devnode(udevice));
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if ((m_types & Device_InputMask) && candidate.startsWith(QT_EVDEV_DEVICE ""_L1))
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devices << candidate;
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if ((m_types & Device_VideoMask) && candidate.startsWith(QT_DRM_DEVICE ""_L1)) {
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if (m_types & Device_DRM_PrimaryGPU) {
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udev_device *pci = udev_device_get_parent_with_subsystem_devtype(udevice, "pci", 0);
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if (pci) {
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if (qstrcmp(udev_device_get_sysattr_value(pci, "boot_vga"), "1") == 0)
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devices << candidate;
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}
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} else
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devices << candidate;
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}
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udev_device_unref(udevice);
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}
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udev_enumerate_unref(ue);
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qCDebug(lcDD) << "Found matching devices" << devices;
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return devices;
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}
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void QDeviceDiscoveryUDev::handleUDevNotification()
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{
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if (!m_udevMonitor)
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return;
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struct udev_device *dev;
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QString devNode;
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dev = udev_monitor_receive_device(m_udevMonitor);
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if (!dev)
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goto cleanup;
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const char *action;
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action = udev_device_get_action(dev);
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if (!action)
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goto cleanup;
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const char *str;
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str = udev_device_get_devnode(dev);
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if (!str)
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goto cleanup;
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const char *subsystem;
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devNode = QString::fromUtf8(str);
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if (devNode.startsWith(QT_EVDEV_DEVICE ""_L1))
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subsystem = "input";
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else if (devNode.startsWith(QT_DRM_DEVICE ""_L1))
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subsystem = "drm";
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else goto cleanup;
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// if we cannot determine a type, walk up the device tree
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if (!checkDeviceType(dev)) {
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// does not increase the refcount
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struct udev_device *parent_dev = udev_device_get_parent_with_subsystem_devtype(dev, subsystem, 0);
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if (!parent_dev)
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goto cleanup;
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if (!checkDeviceType(parent_dev))
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goto cleanup;
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}
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if (qstrcmp(action, "add") == 0)
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emit deviceDetected(devNode);
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if (qstrcmp(action, "remove") == 0)
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emit deviceRemoved(devNode);
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cleanup:
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udev_device_unref(dev);
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}
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bool QDeviceDiscoveryUDev::checkDeviceType(udev_device *dev)
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{
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if (!dev)
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return false;
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if ((m_types & Device_Keyboard) && (qstrcmp(udev_device_get_property_value(dev, "ID_INPUT_KEYBOARD"), "1") == 0 )) {
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const QString capabilities_key = QString::fromUtf8(udev_device_get_sysattr_value(dev, "capabilities/key"));
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const auto val = QStringView{capabilities_key}.split(u' ', Qt::SkipEmptyParts);
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if (!val.isEmpty()) {
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bool ok;
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unsigned long long keys = val.last().toULongLong(&ok, 16);
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if (ok) {
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// Tests if the letter Q is valid for the device. We may want to alter this test, but it seems mostly reliable.
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bool test = (keys >> KEY_Q) & 1;
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if (test)
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return true;
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}
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}
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}
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if ((m_types & Device_Keyboard) && (qstrcmp(udev_device_get_property_value(dev, "ID_INPUT_KEY"), "1") == 0 ))
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return true;
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if ((m_types & Device_Mouse) && (qstrcmp(udev_device_get_property_value(dev, "ID_INPUT_MOUSE"), "1") == 0))
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return true;
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if ((m_types & Device_Touchpad) && (qstrcmp(udev_device_get_property_value(dev, "ID_INPUT_TOUCHPAD"), "1") == 0))
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return true;
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if ((m_types & Device_Touchscreen) && (qstrcmp(udev_device_get_property_value(dev, "ID_INPUT_TOUCHSCREEN"), "1") == 0))
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return true;
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if ((m_types & Device_Tablet) && (qstrcmp(udev_device_get_property_value(dev, "ID_INPUT_TABLET"), "1") == 0))
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return true;
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if ((m_types & Device_Joystick) && (qstrcmp(udev_device_get_property_value(dev, "ID_INPUT_JOYSTICK"), "1") == 0))
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return true;
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if ((m_types & Device_DRM) && (qstrcmp(udev_device_get_subsystem(dev), "drm") == 0))
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return true;
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return false;
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}
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QT_END_NAMESPACE
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#include "moc_qdevicediscovery_udev_p.cpp"
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