udev: UDevHelper becomes DeviceDiscovery

Rename QUDeviceHelper to QDeviceDiscovery and add a static device
discovery fallback in case we dont have udev. The fallback so far only
scans /dev/input/event* and /dev/dri/card* at startup and detects device
nodes only by device path.

Change-Id: I7a423910b30ae16a10d8f1f47b86c6b4d2c2ec36
Reviewed-by: Girish Ramakrishnan <girish.1.ramakrishnan@nokia.com>
Reviewed-by: Donald Carr <donald.carr@nokia.com>

1 files changed, 114 insertions, 0 deletions

diff --git a/src/platformsupport/devicediscovery/qdevicediscovery_static.cpp b/src/platformsupport/devicediscovery/qdevicediscovery_static.cpp
new file mode 100644
index 0000000000..918ab8799a
--- /dev/null
+++ b/src/platformsupport/devicediscovery/qdevicediscovery_static.cpp
@@ -0,0 +1,114 @@
+/****************************************************************************
+**
+** 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 <QDir>
+
+//#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)
+{
+    return new QDeviceDiscovery(types, parent);
+}
+
+QDeviceDiscovery::QDeviceDiscovery(QDeviceTypes types, QObject *parent) :
+    QObject(parent),
+    m_types(types)
+{
+#ifdef QT_QPA_DEVICE_DISCOVERY_DEBUG
+    qWarning() << "New static DeviceDiscovery created for type" << types;
+#endif
+}
+
+QDeviceDiscovery::~QDeviceDiscovery()
+{
+}
+
+QStringList QDeviceDiscovery::scanConnectedDevices()
+{
+    QStringList devices;
+
+    // check for input devices
+    QDir dir(QString::fromLatin1(QT_EVDEV_DEVICE_PATH));
+    dir.setFilter(QDir::System);
+
+    foreach (const QString &deviceFile, dir.entryList()) {
+        if (checkDeviceType(deviceFile))
+            devices << (dir.absolutePath() + QString::fromLatin1("/") + deviceFile);
+    }
+
+    // check for drm devices
+    dir.setPath(QString::fromLatin1(QT_DRM_DEVICE_PATH));
+    foreach (const QString &deviceFile, dir.entryList()) {
+        if (checkDeviceType(deviceFile))
+            devices << (dir.absolutePath() + QString::fromLatin1("/") + deviceFile);
+    }
+
+#ifdef QT_QPA_DEVICE_DISCOVERY_DEBUG
+    qWarning() << "Static DeviceDiscovery found matching devices" << devices;
+#endif
+
+    return devices;
+}
+
+bool QDeviceDiscovery::checkDeviceType(const QString &device)
+{
+    if ((m_types & (Device_Keyboard | Device_Mouse | Device_Touchpad | Device_Touchscreen)) && device.startsWith(QString::fromLatin1(QT_EVDEV_DEVICE_PREFIX)))
+       return true;
+
+    if ((m_types & Device_DRM) && device.startsWith(QString::fromLatin1(QT_DRM_DEVICE_PREFIX)))
+        return true;
+
+    return false;
+}
+
+QT_END_NAMESPACE