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/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/
**
** This file is part of the QtSystems module 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 "qdisplayinfo_linux_p.h"
#include <QtCore/qdir.h>
#include <QtCore/qmap.h>
QT_BEGIN_NAMESPACE
Q_GLOBAL_STATIC_WITH_ARGS(const QString, BACKLIGHT_SYSFS_PATH, (QStringLiteral("/sys/class/backlight/")))
Q_GLOBAL_STATIC_WITH_ARGS(const QString, GRAPHICS_SYSFS_PATH, (QStringLiteral("/sys/class/graphics/")))
QDisplayInfoPrivate::QDisplayInfoPrivate(QDisplayInfo *parent)
: q_ptr(parent)
{
}
int QDisplayInfoPrivate::brightness(int screen)
{
QMap<QString, QStringList> brightnessMap;
brightnessMap.insert(*BACKLIGHT_SYSFS_PATH(), QStringList() << QStringLiteral("/max_brightness") << QStringLiteral("/actual_brightness"));
brightnessMap.insert(*GRAPHICS_SYSFS_PATH(), QStringList() << QStringLiteral("/backlight_max") << QStringLiteral("/backlight"));
QStringList sysfsPaths = brightnessMap.keys();
foreach (const QString &sysfsPath, sysfsPaths) {
const QStringList dirs = QDir(sysfsPath).entryList(QDir::Dirs | QDir::NoDotAndDotDot);
if (dirs.size() <= screen)
continue;
bool ok = false;
int max = 0;
int actual = 0;
QFile brightness(sysfsPath + dirs.at(screen) + brightnessMap.value(sysfsPath).at(0));
if (brightness.open(QIODevice::ReadOnly)) {
max = brightness.readAll().simplified().toInt(&ok);
if (!ok || max == 0)
continue;
brightness.close();
brightness.setFileName(sysfsPath + dirs.at(screen) + brightnessMap.value(sysfsPath).at(1));
if (brightness.open(QIODevice::ReadOnly)) {
actual = brightness.readAll().simplified().toInt(&ok);
if (!ok)
continue;
return actual * 100 / max;
}
}
}
return -1;
}
int QDisplayInfoPrivate::contrast(int screen)
{
Q_UNUSED(screen)
return -1;
}
QDisplayInfo::BacklightState QDisplayInfoPrivate::backlightState(int screen)
{
int actualBrightness = brightness(screen);
if (actualBrightness == 100)
return QDisplayInfo::BacklightOn;
else if (actualBrightness == 0)
return QDisplayInfo::BacklightOff;
return QDisplayInfo::BacklightUnknown;
}
QT_END_NAMESPACE
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