Disable terminal keyboard on eglfs and linuxfb

Unify the behavior for eglfs, linuxfb and kms. The relevant code is
now moved from kms into fbconvenience.

From now on, on all three platforms, terminal keyboard input is turned
off by default. This feature can be disabled by setting
QT_QPA_ENABLE_TERMINAL_KEYBOARD to 1. This is similar to what the
evdev-based keyboard handler did in QWS in Qt4.

[ChangeLog][QtGui] The main Embedded Linux platform plugins (eglfs,
linuxfb, kms) are changed to behave identically with regards to
terminal keyboard input: it is turned off by default on all of these
platforms. If this feature is not desired, it can be disabled by
setting the environment variable QT_QPA_ENABLE_TERMINAL_KEYBOARD.

Task-number: QTBUG-36394

Change-Id: I69e47ed7580464dc5e703e9a0e23891c7c8b7790
Reviewed-by: Andy Nichols <andy.nichols@digia.com>

1 files changed, 111 insertions, 0 deletions

diff --git a/src/platformsupport/fbconvenience/qfbvthandler.cpp b/src/platformsupport/fbconvenience/qfbvthandler.cpp
new file mode 100644
index 0000000000..edfd13d9bf
--- /dev/null
+++ b/src/platformsupport/fbconvenience/qfbvthandler.cpp
@@ -0,0 +1,111 @@
+/****************************************************************************
+**
+** 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.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** 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 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, 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.
+**
+** 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.
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qfbvthandler_p.h"
+#include <QtCore/private/qcrashhandler_p.h>
+#include <QtGui/private/qguiapplication_p.h>
+
+#if defined(Q_OS_LINUX) && !defined(QT_NO_EVDEV)
+#define HAS_VT
+#endif
+
+#ifdef HAS_VT
+
+#include <sys/ioctl.h>
+#include <linux/kd.h>
+
+#ifdef K_OFF
+#define KBD_OFF_MODE K_OFF
+#else
+#define KBD_OFF_MODE K_RAW
+#endif
+
+#endif // HAS_VT
+
+QT_BEGIN_NAMESPACE
+
+QFbVtHandler *QFbVtHandler::self = 0;
+
+QFbVtHandler::QFbVtHandler(QObject *parent)
+    : QObject(parent), m_tty(-1)
+{
+    Q_ASSERT(!self);
+    self = this;
+
+#ifdef HAS_VT
+    if (!isatty(0))
+        return;
+
+    m_tty = 0;
+    ::ioctl(m_tty, KDGKBMODE, &m_oldKbdMode);
+    if (!qgetenv("QT_QPA_ENABLE_TERMINAL_KEYBOARD").toInt()) {
+        ::ioctl(m_tty, KDSKBMODE, KBD_OFF_MODE);
+        QGuiApplicationPrivate *appd = QGuiApplicationPrivate::instance();
+        Q_ASSERT(appd);
+        QSegfaultHandler::initialize(appd->argv, appd->argc);
+        QSegfaultHandler::installCrashHandler(crashHandler);
+    }
+#endif
+}
+
+QFbVtHandler::~QFbVtHandler()
+{
+    self->cleanup();
+    self = 0;
+}
+
+void QFbVtHandler::cleanup()
+{
+    if (m_tty == -1)
+        return;
+
+#ifdef HAS_VT
+    ::ioctl(m_tty, KDSKBMODE, m_oldKbdMode);
+#endif
+}
+
+void QFbVtHandler::crashHandler()
+{
+    Q_ASSERT(self);
+    self->cleanup();
+}
+
+QT_END_NAMESPACE