Implement basic bits for device autodetection via udev.

The graphics cards and eventually the input devices need to be resolved
via udev. This commit adds a listener class and an abstract base class
for writing device specific handlers.

Change-Id: I62784c98bc7ad4bc1431d61cd5f13c8b48edf330
Reviewed-by: Andy Nichols <andy.nichols@nokia.com>

1 files changed, 101 insertions, 0 deletions

diff --git a/src/plugins/platforms/kms/qkmsudevlistener.cpp b/src/plugins/platforms/kms/qkmsudevlistener.cpp
new file mode 100644
index 0000000000..c0a933b57b
--- /dev/null
+++ b/src/plugins/platforms/kms/qkmsudevlistener.cpp
@@ -0,0 +1,101 @@
+/****************************************************************************
+**
+** 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 <qkmsudevlistener.h>
+
+QT_BEGIN_NAMESPACE
+
+QKmsUdevListener::QKmsUdevListener(QObject *parent)
+    : QObject(parent)
+{
+    m_udev = udev_new();
+}
+
+QKmsUdevListener::~QKmsUdevListener()
+{
+    udev_unref(m_udev);
+}
+
+void QKmsUdevListener::addHandler(QKmsUdevHandler *handler)
+{
+    m_handlers.removeAll((QKmsUdevHandler *) 0);
+    m_handlers.removeAll(handler);
+    m_handlers.prepend(handler);
+
+    scan();
+}
+
+bool QKmsUdevListener::create(struct udev_device *device)
+{
+    foreach (QKmsUdevHandler *handler, m_handlers) {
+        if (!handler)
+            continue;
+
+        QObject *obj = handler->create(device);
+        if (obj) {
+            m_devices[udev_device_get_syspath(device)] = obj;
+            return true;
+        }
+    }
+
+    return false;
+}
+
+void QKmsUdevListener::scan()
+{
+    struct udev_enumerate *e;
+    struct udev_list_entry *entry;
+
+    e = udev_enumerate_new(m_udev);
+    udev_enumerate_scan_devices(e);
+    udev_list_entry_foreach(entry, udev_enumerate_get_list_entry(e)) {
+        const char *path = udev_list_entry_get_name(entry);
+        if (m_devices.contains(path))
+            continue;
+
+        struct udev_device *device = udev_device_new_from_syspath(m_udev, path);
+        create(device);
+        udev_device_unref(device);
+    }
+    udev_enumerate_unref(e);
+}
+
+QT_END_NAMESPACE