diff options
Diffstat (limited to 'src/platformsupport/devicediscovery/qdevicediscovery_udev.cpp')
| -rw-r--r-- | src/platformsupport/devicediscovery/qdevicediscovery_udev.cpp | 250 |
1 files changed, 250 insertions, 0 deletions
diff --git a/src/platformsupport/devicediscovery/qdevicediscovery_udev.cpp b/src/platformsupport/devicediscovery/qdevicediscovery_udev.cpp new file mode 100644 index 0000000000..f7fe7cb87c --- /dev/null +++ b/src/platformsupport/devicediscovery/qdevicediscovery_udev.cpp @@ -0,0 +1,250 @@ +/**************************************************************************** +** +** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies). +** Contact: http://www.qt-project.org/ +** +** This file is part of the plugins of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** GNU Lesser General Public License Usage +** This file may be used under the terms of the GNU Lesser General Public +** License version 2.1 as published by the Free Software Foundation and +** appearing in the file LICENSE.LGPL included in the packaging of this +** file. Please review the following information to ensure the GNU Lesser +** General Public License version 2.1 requirements will be met: +** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. +** +** In addition, as a special exception, Nokia gives you certain additional +** rights. These rights are described in the Nokia Qt LGPL Exception +** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU General +** Public License version 3.0 as published by the Free Software Foundation +** and appearing in the file LICENSE.GPL included in the packaging of this +** file. Please review the following information to ensure the GNU General +** Public License version 3.0 requirements will be met: +** http://www.gnu.org/copyleft/gpl.html. +** +** Other Usage +** Alternatively, this file may be used in accordance with the terms and +** conditions contained in a signed written agreement between you and Nokia. +** +** +** +** +** +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#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"); + + 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))) + 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_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_DRM) && (qstrcmp(udev_device_get_subsystem(dev), "drm") == 0)) + return true; + + return false; +} + +QT_END_NAMESPACE |