Add a helper to control the rpi's backlight

nymea-app/nymea-app.pro

@@ -17,6 +17,7 @@ linux:!android:LIBS += -lavahi-client -lavahi-common
 PRE_TARGETDEPS += ../libnymea-app-core ../libnymea-common
 
 HEADERS += \
+    platformintegration/generic/raspberrypihelper.h \
     stylecontroller.h \
     pushnotifications.h \
     platformhelper.h \
@@ -24,6 +25,7 @@ HEADERS += \
     applogcontroller.h
 
 SOURCES += main.cpp \
+    platformintegration/generic/raspberrypihelper.cpp \
     stylecontroller.cpp \
     pushnotifications.cpp \
     platformhelper.cpp \

nymea-app/platformhelper.cpp

@@ -4,3 +4,18 @@ PlatformHelper::PlatformHelper(QObject *parent) : QObject(parent)
 {
 
 }
+
+bool PlatformHelper::canControlScreen() const
+{
+    return false;
+}
+
+int PlatformHelper::screenTimeout() const
+{
+    return 0;
+}
+
+void PlatformHelper::setScreenTimeout(int screenTimeout)
+{
+    Q_UNUSED(screenTimeout)
+}

nymea-app/platformhelper.h

@@ -12,6 +12,8 @@ class PlatformHelper : public QObject
     Q_PROPERTY(QString deviceModel READ deviceModel CONSTANT)
     Q_PROPERTY(QString deviceManufacturer READ deviceManufacturer CONSTANT)
     Q_PROPERTY(QString machineHostname READ machineHostname CONSTANT)
+    Q_PROPERTY(bool canControlScreen READ canControlScreen CONSTANT)
+    Q_PROPERTY(int screenTimeout READ screenTimeout WRITE setScreenTimeout NOTIFY screenTimeoutChanged)
 
 public:
     enum HapticsFeedback {
@@ -35,10 +37,15 @@ public:
     virtual QString deviceModel() const = 0;
     virtual QString deviceManufacturer() const = 0;
 
+    virtual bool canControlScreen() const;
+    virtual int screenTimeout() const;
+    virtual void setScreenTimeout(int screenTimeout);
+
     Q_INVOKABLE virtual void vibrate(HapticsFeedback feedbackType) = 0;
 
 signals:
     void permissionsRequestFinished();
+    void screenTimeoutChanged();
 };
 
 #endif // PLATFORMHELPER_H

nymea-app/platformintegration/generic/platformhelpergeneric.cpp

@@ -2,7 +2,7 @@
 
 PlatformHelperGeneric::PlatformHelperGeneric(QObject *parent) : PlatformHelper(parent)
 {
-
+    m_piHelper = new RaspberryPiHelper(this);
 }
 
 void PlatformHelperGeneric::requestPermissions()
@@ -49,6 +49,24 @@ QString PlatformHelperGeneric::deviceManufacturer() const
     return QSysInfo::productType();
 }
 
+bool PlatformHelperGeneric::canControlScreen() const
+{
+    return m_piHelper->active();
+}
+
+int PlatformHelperGeneric::screenTimeout() const
+{
+    return m_piHelper->screenTimeout();
+}
+
+void PlatformHelperGeneric::setScreenTimeout(int timeout)
+{
+    if (m_piHelper->screenTimeout() != timeout) {
+        m_piHelper->setScreenTimeout(timeout);
+        emit screenTimeoutChanged();
+    }
+}
+
 void PlatformHelperGeneric::vibrate(PlatformHelper::HapticsFeedback feedbyckType)
 {
     Q_UNUSED(feedbyckType)

nymea-app/platformintegration/generic/platformhelpergeneric.h

@@ -3,6 +3,7 @@
 
 #include <QObject>
 #include "platformhelper.h"
+#include "raspberrypihelper.h"
 
 class PlatformHelperGeneric : public PlatformHelper
 {
@@ -21,10 +22,14 @@ public:
     virtual QString deviceModel() const override;
     virtual QString deviceManufacturer() const override;
 
-    Q_INVOKABLE virtual void vibrate(HapticsFeedback feedbyckType) override;
-signals:
+    virtual bool canControlScreen() const override;
+    virtual int screenTimeout() const override;
+    virtual void setScreenTimeout(int timeout) override;
 
-public slots:
+    Q_INVOKABLE virtual void vibrate(HapticsFeedback feedbyckType) override;
+
+private:
+    RaspberryPiHelper *m_piHelper = nullptr;
 };
 
 #endif // PLATFORMHELPERGENERIC_H

nymea-app/platformintegration/generic/raspberrypihelper.cpp

@@ -0,0 +1,106 @@
+#include "raspberrypihelper.h"
+
+#include <QDebug>
+#include <QApplication>
+#include <QWindow>
+#include <QSettings>
+
+RaspberryPiHelper::RaspberryPiHelper(QObject *parent) : QObject(parent)
+{
+    m_sysFsFile.setFileName("/sys/class/backlight/rpi_backlight/bl_power");
+    bool available = m_sysFsFile.open(QFile::ReadWrite | QFile::Text);
+
+    if (!available) {
+        return;
+    }
+
+    qDebug() << "Raspberry Pi detected. Enabling backlight control";
+
+    screenOn();
+
+    foreach (QWindow *w, qApp->topLevelWindows()) {
+        w->installEventFilter(this);
+    }
+
+    QSettings settings;
+    m_screenOffTimer.setInterval(settings.value("screenOffTimeout", 15000).toInt());
+    m_screenOffTimer.setSingleShot(true);
+    connect(&m_screenOffTimer, &QTimer::timeout, this, &RaspberryPiHelper::screenOff);
+    if (m_screenOffTimer.interval() > 0) {
+        m_screenOffTimer.start();
+    }
+}
+
+bool RaspberryPiHelper::active() const
+{
+    return m_sysFsFile.isOpen();
+}
+
+int RaspberryPiHelper::screenTimeout() const
+{
+    return m_screenOffTimer.interval();
+}
+
+void RaspberryPiHelper::setScreenTimeout(int timeout)
+{
+    m_screenOffTimer.setInterval(timeout);
+    QSettings settings;
+    settings.setValue("screenOffTimeout", timeout);
+    if (timeout > 0) {
+        m_screenOffTimer.start();
+    } else {
+        m_screenOffTimer.stop();
+    }
+}
+
+bool RaspberryPiHelper::eventFilter(QObject *watched, QEvent *event)
+{
+    if (m_screenOffTimer.interval() == 0) {
+        return QObject::eventFilter(watched, event);
+    }
+
+    QList<QEvent::Type> watchedTypes = {
+        QEvent::ActivationChange,
+        QEvent::ApplicationStateChange,
+        QEvent::KeyPress,
+        QEvent::KeyRelease,
+        QEvent::MouseButtonPress,
+        QEvent::MouseButtonRelease,
+        QEvent::MouseMove,
+        QEvent::Show,
+        QEvent::TouchBegin,
+        QEvent::TouchEnd,
+        QEvent::TouchUpdate,
+    };
+    if (!watchedTypes.contains(event->type())) {
+        return QObject::eventFilter(watched, event);
+    }
+
+    if (!m_screenOffTimer.isActive()) {
+        screenOn();
+        m_screenOffTimer.start();
+        return true;
+    }
+    m_screenOffTimer.start( );
+    return QObject::eventFilter(watched, event);
+}
+
+void RaspberryPiHelper::screenOn()
+{
+    qDebug() << "Turning screen on";
+    int ret = m_sysFsFile.write("0\n");
+    m_sysFsFile.flush();
+    if (ret < 0) {
+        qWarning() << "Failed to power on screen";
+    }
+}
+
+void RaspberryPiHelper::screenOff()
+{
+    qDebug() << "Turning screen off";
+    int ret = m_sysFsFile.write("1\n");
+    m_sysFsFile.flush();
+    if (ret < 0) {
+        qWarning() << "Failed to power off screen";
+    }
+}

nymea-app/platformintegration/generic/raspberrypihelper.h

@@ -0,0 +1,29 @@
+#ifndef RASPBERRYPIHELPER_H
+#define RASPBERRYPIHELPER_H
+
+#include <QObject>
+#include <QTimer>
+#include <QFile>
+
+class RaspberryPiHelper : public QObject
+{
+    Q_OBJECT
+public:
+    explicit RaspberryPiHelper(QObject *parent = nullptr);
+
+    bool active() const;
+    int screenTimeout() const;
+    void setScreenTimeout(int timeout);
+
+    bool eventFilter(QObject *watched, QEvent *event) override;
+
+private slots:
+    void screenOn();
+    void screenOff();
+
+private:
+    QTimer m_screenOffTimer;
+    QFile m_sysFsFile;
+};
+
+#endif // RASPBERRYPIHELPER_H

nymea-app/ui/appsettings/LookAndFeelSettingsPage.qml

@@ -89,6 +89,35 @@ Page {
             checked: settings.showConnectionTabs
             onClicked: settings.showConnectionTabs = checked
         }
+        CheckDelegate {
+            id: screenOffCheck
+            Layout.fillWidth: true
+            text: qsTr("Turn screen off when idle")
+            visible: PlatformHelper.canControlScreen
+            checked: PlatformHelper.screenTimeout > 0
+            onClicked: PlatformHelper.screenTimeout = (checked ? 15000 : 0)
+        }
+        ItemDelegate {
+            Layout.fillWidth: true
+            Layout.preferredHeight: screenOffCheck.height
+            visible: PlatformHelper.screenTimeout > 0
+            topPadding: 0
+            contentItem: RowLayout {
+                Label {
+                    Layout.fillWidth: true
+                    text: qsTr("Screen off timeout")
+                }
+                SpinBox {
+                    value: PlatformHelper.screenTimeout / 1000
+                    onValueModified: {
+                        PlatformHelper.screenTimeout = value * 1000
+                    }
+                }
+                Label {
+                    text: qsTr("seconds")
+                }
+            }
+        }
     }
 
     Component {