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+/****************************************************************************
+**
+** Copyright (C) 2017 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the E-Bike demo project.
+**
+** $QT_BEGIN_LICENSE:LGPL3$
+** 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 The Qt Company. For licensing terms
+** and conditions see http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://www.qt.io/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 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPLv3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or later 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 2.0 requirements will be
+** met: http://www.gnu.org/licenses/gpl-2.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QFile>
+
+#include "brightnesscontroller.h"
+
+static const char brightnessSource[] = "/sys/class/backlight/backlight/brightness";
+static const int brightnessMax = 6;
+static const int brightnessMin = 1;
+
+BrightnessController::BrightnessController(QObject *parent)
+ : QObject(parent)
+ , m_automatic(false)
+{
+ QFile brightnessfile(brightnessSource);
+ if (brightnessfile.exists() && brightnessfile.open(QIODevice::ReadOnly)) {
+ char data[1];
+ if (brightnessfile.read(data, 1)) {
+ m_brightness = static_cast<int>(data[0] - '0');
+ }
+ } else {
+ // By default set to half
+ m_brightness = (brightnessMax + brightnessMin) / 2;
+ }
+}
+
+void BrightnessController::setBrightness(int brightness)
+{
+ if (m_brightness == brightness)
+ return;
+
+ // Valid values are between 1-6
+ if (brightness < brightnessMin || brightness > brightnessMax)
+ return;
+
+ QFile brightnessfile(brightnessSource);
+ if (brightnessfile.exists() && brightnessfile.open(QIODevice::WriteOnly)) {
+ char data[1] = {static_cast<char>('0' + brightness)};
+ if (brightnessfile.write(data, 1) == 1) {
+ m_brightness = brightness;
+ emit brightnessChanged(m_brightness);
+ }
+ } else {
+ // File does not exists, simulate changes
+ m_brightness = brightness;
+ emit brightnessChanged(m_brightness);
+ }
+}
+
+void BrightnessController::setAutomatic(bool automatic)
+{
+ if (m_automatic == automatic)
+ return;
+
+ m_automatic = automatic;
+ emit automaticChanged(m_automatic);
+}