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qt6-bb10/src/platformsupport/devicediscovery/qdevicediscovery_udev.cpp

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/****************************************************************************
**
** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the plugins 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 Digia. For licensing terms and
** conditions see http://qt.digia.com/licensing. For further information
** use the contact form at http://qt.digia.com/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.
**
** In addition, as a special exception, Digia gives you certain additional
** rights. These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qdevicediscovery_p.h"
#include <QStringList>
#include <QCoreApplication>
#include <QObject>
#include <QHash>
#include <QSocketNotifier>
#include <linux/input.h>
//#define QT_QPA_DEVICE_DISCOVERY_DEBUG
#ifdef QT_QPA_DEVICE_DISCOVERY_DEBUG
#include <QtDebug>
#endif
QT_BEGIN_NAMESPACE
QDeviceDiscovery *QDeviceDiscovery::create(QDeviceTypes types, QObject *parent)
{
#ifdef QT_QPA_DEVICE_DISCOVERY_DEBUG
qWarning() << "Try to create new UDeviceHelper";
#endif
QDeviceDiscovery *helper = 0;
struct udev *udev;
udev = udev_new();
if (udev) {
helper = new QDeviceDiscovery(types, udev, parent);
} else {
qWarning("Failed to get udev library context.");
}
return helper;
}
QDeviceDiscovery::QDeviceDiscovery(QDeviceTypes types, struct udev *udev, QObject *parent) :
QObject(parent),
m_types(types), m_udev(udev), m_udevMonitor(0), m_udevMonitorFileDescriptor(-1), m_udevSocketNotifier(0)
{
#ifdef QT_QPA_DEVICE_DISCOVERY_DEBUG
qWarning() << "New UDeviceHelper created for type" << types;
#endif
if (!m_udev)
return;
m_udevMonitor = udev_monitor_new_from_netlink(m_udev, "udev");
if (!m_udevMonitor) {
#ifdef QT_QPA_DEVICE_DISCOVERY_DEBUG
qWarning("Unable to create an Udev monitor. No devices can be detected.");
#endif
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(int)), this, SLOT(handleUDevNotification()));
}
QDeviceDiscovery::~QDeviceDiscovery()
{
if (m_udevMonitor)
udev_monitor_unref(m_udevMonitor);
if (m_udev)
udev_unref(m_udev);
}
QStringList QDeviceDiscovery::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 (udev_enumerate_scan_devices(ue) != 0) {
#ifdef QT_QPA_DEVICE_DISCOVERY_DEBUG
qWarning() << "UDeviceHelper scan connected devices for enumeration failed";
#endif
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(QLatin1String(QT_EVDEV_DEVICE)))
devices << candidate;
if ((m_types & Device_VideoMask) && candidate.startsWith(QLatin1String(QT_DRM_DEVICE))) {
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);
#ifdef QT_QPA_DEVICE_DISCOVERY_DEBUG
qWarning() << "UDeviceHelper found matching devices" << devices;
#endif
return devices;
}
void QDeviceDiscovery::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(QLatin1String(QT_EVDEV_DEVICE)))
subsystem = "input";
else if (devNode.startsWith(QLatin1String(QT_DRM_DEVICE)))
subsystem = "drm";
else goto cleanup;
// if we cannot determine a type, walk up the device tree
if (!checkDeviceType(dev)) {
// does not increase the refcount
dev = udev_device_get_parent_with_subsystem_devtype(dev, subsystem, 0);
if (!dev)
goto cleanup;
if (!checkDeviceType(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 QDeviceDiscovery::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 char *capabilities_key = udev_device_get_sysattr_value(dev, "capabilities/key");
QStringList val = QString::fromUtf8(capabilities_key).split(QString::fromUtf8(" "), QString::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_DRM) && (qstrcmp(udev_device_get_subsystem(dev), "drm") == 0))
return true;
return false;
}
QT_END_NAMESPACE
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