Add support for setting the screen brightness on Raspberry Pis

libnymea-app-core/connection/nymeaconnection.cpp

@@ -388,9 +388,9 @@ void NymeaConnection::updateActiveBearers()
 {
     NymeaConnection::BearerTypes availableBearerTypes;
     QList<QNetworkConfiguration> configs = m_networkConfigManager->allConfigurations(QNetworkConfiguration::Active);
-    qDebug() << "Network configuations:" << configs.count();
+//    qDebug() << "Network configuations:" << configs.count();
     foreach (const QNetworkConfiguration &config, configs) {
-        qDebug() << "Active network config:" << config.name() << config.bearerTypeFamily() << config.bearerTypeName();
+//        qDebug() << "Active network config:" << config.name() << config.bearerTypeFamily() << config.bearerTypeName();
 
         // NOTE: iOS doesn't correctly report bearer types. It'll be Unknown all the time. Let's hardcode it to WiFi for that...
 #if defined(Q_OS_IOS)

nymea-app/platformhelper.cpp

@@ -19,3 +19,13 @@ void PlatformHelper::setScreenTimeout(int screenTimeout)
 {
     Q_UNUSED(screenTimeout)
 }
+
+int PlatformHelper::screenBrightness() const
+{
+    return 0;
+}
+
+void PlatformHelper::setScreenBrightness(int percent)
+{
+    Q_UNUSED(percent)
+}

nymea-app/platformhelper.h

@@ -14,6 +14,7 @@ class PlatformHelper : public QObject
     Q_PROPERTY(QString machineHostname READ machineHostname CONSTANT)
     Q_PROPERTY(bool canControlScreen READ canControlScreen CONSTANT)
     Q_PROPERTY(int screenTimeout READ screenTimeout WRITE setScreenTimeout NOTIFY screenTimeoutChanged)
+    Q_PROPERTY(int screenBrightness READ screenBrightness WRITE setScreenBrightness NOTIFY screenBrightnessChanged)
 
 public:
     enum HapticsFeedback {
@@ -40,12 +41,16 @@ public:
     virtual bool canControlScreen() const;
     virtual int screenTimeout() const;
     virtual void setScreenTimeout(int screenTimeout);
+    virtual int screenBrightness() const;
+    virtual void setScreenBrightness(int percent);
+
 
     Q_INVOKABLE virtual void vibrate(HapticsFeedback feedbackType) = 0;
 
 signals:
     void permissionsRequestFinished();
     void screenTimeoutChanged();
+    void screenBrightnessChanged();
 };
 
 #endif // PLATFORMHELPER_H

nymea-app/platformintegration/generic/platformhelpergeneric.cpp

@@ -67,6 +67,19 @@ void PlatformHelperGeneric::setScreenTimeout(int timeout)
     }
 }
 
+int PlatformHelperGeneric::screenBrightness() const
+{
+    return m_piHelper->screenBrightness();
+}
+
+void PlatformHelperGeneric::setScreenBrightness(int percent)
+{
+    if (m_piHelper->screenBrightness() != percent) {
+        m_piHelper->setScreenBrightness(percent);
+        emit screenTimeoutChanged();
+    }
+}
+
 void PlatformHelperGeneric::vibrate(PlatformHelper::HapticsFeedback feedbyckType)
 {
     Q_UNUSED(feedbyckType)

nymea-app/platformintegration/generic/platformhelpergeneric.h

@@ -25,6 +25,8 @@ public:
     virtual bool canControlScreen() const override;
     virtual int screenTimeout() const override;
     virtual void setScreenTimeout(int timeout) override;
+    virtual int screenBrightness() const override;
+    virtual void setScreenBrightness(int percent) override;
 
     Q_INVOKABLE virtual void vibrate(HapticsFeedback feedbyckType) override;
 

nymea-app/platformintegration/generic/raspberrypihelper.cpp

@@ -7,8 +7,8 @@
 
 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);
+    m_powerFile.setFileName("/sys/class/backlight/rpi_backlight/bl_power");
+    bool available = m_powerFile.open(QFile::ReadWrite | QFile::Text);
 
     if (!available) {
         return;
@@ -16,6 +16,14 @@ RaspberryPiHelper::RaspberryPiHelper(QObject *parent) : QObject(parent)
 
     qDebug() << "Raspberry Pi detected. Enabling backlight control";
 
+    m_brightnessFile.setFileName("/sys/class/backlight/rpi_backlight/brightness");
+    if (!m_brightnessFile.open(QFile::ReadWrite | QFile::Text)) {
+        qWarning() << "Failed to open brightness file";
+    }
+    QByteArray currentBrightness = m_brightnessFile.readLine();
+    m_currentBrightness = currentBrightness.trimmed().toInt() * 100 / 255;
+    qDebug() << "Current brightness is:" << currentBrightness << m_currentBrightness;
+
     screenOn();
 
     foreach (QWindow *w, qApp->topLevelWindows()) {
@@ -33,7 +41,7 @@ RaspberryPiHelper::RaspberryPiHelper(QObject *parent) : QObject(parent)
 
 bool RaspberryPiHelper::active() const
 {
-    return m_sysFsFile.isOpen();
+    return m_powerFile.isOpen();
 }
 
 int RaspberryPiHelper::screenTimeout() const
@@ -53,6 +61,18 @@ void RaspberryPiHelper::setScreenTimeout(int timeout)
     }
 }
 
+int RaspberryPiHelper::screenBrightness() const
+{
+    return m_currentBrightness;
+}
+
+void RaspberryPiHelper::setScreenBrightness(int percent)
+{
+    m_currentBrightness = percent;
+    m_brightnessFile.write(QString("%1\n").arg(percent * 255 / 100).toUtf8());
+    m_brightnessFile.flush();
+}
+
 bool RaspberryPiHelper::eventFilter(QObject *watched, QEvent *event)
 {
     if (m_screenOffTimer.interval() == 0) {
@@ -88,8 +108,8 @@ bool RaspberryPiHelper::eventFilter(QObject *watched, QEvent *event)
 void RaspberryPiHelper::screenOn()
 {
     qDebug() << "Turning screen on";
-    int ret = m_sysFsFile.write("0\n");
-    m_sysFsFile.flush();
+    int ret = m_powerFile.write("0\n");
+    m_powerFile.flush();
     if (ret < 0) {
         qWarning() << "Failed to power on screen";
     }
@@ -98,8 +118,8 @@ void RaspberryPiHelper::screenOn()
 void RaspberryPiHelper::screenOff()
 {
     qDebug() << "Turning screen off";
-    int ret = m_sysFsFile.write("1\n");
-    m_sysFsFile.flush();
+    int ret = m_powerFile.write("1\n");
+    m_powerFile.flush();
     if (ret < 0) {
         qWarning() << "Failed to power off screen";
     }

nymea-app/platformintegration/generic/raspberrypihelper.h

@@ -15,6 +15,9 @@ public:
     int screenTimeout() const;
     void setScreenTimeout(int timeout);
 
+    int screenBrightness() const;
+    void setScreenBrightness(int percent);
+
     bool eventFilter(QObject *watched, QEvent *event) override;
 
 private slots:
@@ -23,7 +26,10 @@ private slots:
 
 private:
     QTimer m_screenOffTimer;
-    QFile m_sysFsFile;
+    QFile m_powerFile;
+    QFile m_brightnessFile;
+
+    int m_currentBrightness = 255;
 };
 
 #endif // RASPBERRYPIHELPER_H

nymea-app/ui/appsettings/LookAndFeelSettingsPage.qml

@@ -89,6 +89,7 @@ Page {
             checked: settings.showConnectionTabs
             onClicked: settings.showConnectionTabs = checked
         }
+
         CheckDelegate {
             id: screenOffCheck
             Layout.fillWidth: true
@@ -97,6 +98,7 @@ Page {
             checked: PlatformHelper.screenTimeout > 0
             onClicked: PlatformHelper.screenTimeout = (checked ? 15000 : 0)
         }
+
         ItemDelegate {
             Layout.fillWidth: true
             Layout.preferredHeight: screenOffCheck.height
@@ -118,6 +120,26 @@ Page {
                 }
             }
         }
+
+        ItemDelegate {
+            Layout.fillWidth: true
+            visible: PlatformHelper.canControlScreen
+            topPadding: 0
+            contentItem: RowLayout {
+                Label {
+                    Layout.fillWidth: true
+                    text: qsTr("Screen brightness")
+                }
+                Slider {
+                    Layout.fillWidth: true
+                    value: PlatformHelper.screenBrightness
+                    onMoved: PlatformHelper.screenBrightness = value
+                    from: 0
+                    to: 100
+                    stepSize: 1
+                }
+            }
+        }
     }
 
     Component {