Add a QML plugin to expose AMB's ClimateControl objects.

To expose the AMB ClimateControl objects to the application layer, add a
QML plugin so the application developers can natively configure the
vehicle's climate controls based on user input.

Because the potential compatibility issue between AMB and Qt being
discussed on the AGL mailing list has not yet been resolved, this commit
also adds a helper program that the climate control plugin will use as a
workaround to access AMB that may be removed in the future.

To include support for this plugin, it is necessary for users to add
"climatecontrolplugin" to their conf/local.conf when building the image.

Change-Id: I6117f0a13e4195e460e3b552befb6e326cdf0f6a
Signed-off-by: Matthew Vick <mvick@jaguarlandrover.com>

1 files changed, 262 insertions, 0 deletions

diff --git a/recipes-automotive/climatecontrolplugin/files/climatecontrol.cpp b/recipes-automotive/climatecontrolplugin/files/climatecontrol.cpp
new file mode 100644
index 00000000..dc2a54b4
--- /dev/null
+++ b/recipes-automotive/climatecontrolplugin/files/climatecontrol.cpp
@@ -0,0 +1,262 @@
+/* Copyright (C) 2015, Jaguar Land Rover. All Rights Reserved.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include <QDBusConnection>
+#include <QDBusObjectPath>
+#include <QDBusReply>
+#include <QDebug>
+
+#include "climatecontrol.h"
+
+ClimateControl::ClimateControl(QQuickItem *parent):
+    QQuickItem(parent)
+{
+    qDebug() << "ClimateControl plugin loaded!";
+
+    //
+    // Verify that we can access the system bus, where AMB resides. This is largely informational, since the ambdbusaccess
+    // application is responsible for actually accessing AMB.
+    //
+    if (!QDBusConnection::systemBus().isConnected())
+    {
+        qDebug() << "Unable to connect to system bus.";
+    }
+}
+
+ClimateControl::~ClimateControl()
+{
+    qDebug() << "ClimateControl plugin unloaded.";
+}
+
+// Accessor methods.
+qint32 ClimateControl::getZone()
+{
+    return this->zone;
+}
+
+void ClimateControl::setZone(qint32 newZone)
+{
+    if (this->zone != newZone)
+    {
+        this->zone = newZone;
+
+        qDebug().nospace() << "Updated zone to " << this->zone << ".";
+
+        emit zoneChanged();
+
+        // Now that the zone has been updated, fetch the settings for this new zone.
+        this->getSettings();
+    }
+}
+
+quint16 ClimateControl::getFanSpeedLevel()
+{
+    return this->fanSpeedLevel;
+}
+
+void ClimateControl::setFanSpeedLevel(quint16 newFanSpeedLevel)
+{
+    if (this->fanSpeedLevel != newFanSpeedLevel)
+    {
+        this->dbusWrite("FanSpeedLevel", newFanSpeedLevel);
+        this->fanSpeedLevel = newFanSpeedLevel;
+
+        qDebug().nospace() << "Updated fan speed level to " << this->fanSpeedLevel << ".";
+
+        emit fanSpeedLevelChanged();
+    }
+}
+
+qint32 ClimateControl::getTargetTemperature()
+{
+    return this->targetTemperature;
+}
+
+void ClimateControl::setTargetTemperature(qint32 newTargetTemperature)
+{
+    if (this->targetTemperature != newTargetTemperature)
+    {
+        this->dbusWrite("TargetTemperature", newTargetTemperature);
+        this->targetTemperature = newTargetTemperature;
+
+        qDebug().nospace() << "Updated target temperature to " << this->targetTemperature << ".";
+
+        emit targetTemperatureChanged();
+    }
+}
+
+bool ClimateControl::getAirConditioning()
+{
+    return this->airConditioning;
+}
+
+void ClimateControl::setAirConditioning(bool newAirConditioning)
+{
+    if (this->airConditioning != newAirConditioning)
+    {
+        // NOTE: This property is not enabled in the current version of AMB, so no D-Bus access is performed.
+        this->airConditioning = newAirConditioning;
+
+        qDebug().nospace() << "Updated air conditioning to " << this->airConditioning << ".";
+
+        emit airConditioningChanged();
+    }
+}
+
+bool ClimateControl::getHeater()
+{
+    return this->heater;
+}
+
+void ClimateControl::setHeater(bool newHeater)
+{
+    if (this->heater != newHeater)
+    {
+        // NOTE: This property is not enabled in the current version of AMB, so no D-Bus access is performed.
+        this->heater = newHeater;
+
+        qDebug().nospace() << "Updated heater to " << this->heater << ".";
+
+        emit heaterChanged();
+    }
+}
+
+quint8 ClimateControl::getSeatHeater()
+{
+    return this->seatHeater;
+}
+
+void ClimateControl::setSeatHeater(quint8 newSeatHeater)
+{
+    if (this->seatHeater != newSeatHeater)
+    {
+        // NOTE: This property is not enabled in the current version of AMB, so no D-Bus access is performed.
+        this->seatHeater = newSeatHeater;
+
+        qDebug().nospace() << "Updated seat heater to " << this->seatHeater << ".";
+
+        emit seatHeaterChanged();
+    }
+}
+
+quint8 ClimateControl::getSeatCooler()
+{
+    return this->seatCooler;
+}
+
+void ClimateControl::setSeatCooler(quint8 newSeatCooler)
+{
+    if (this->seatCooler != newSeatCooler)
+    {
+        // NOTE: This property is not enabled in the current version of AMB, so no D-Bus access is performed.
+        this->seatCooler = newSeatCooler;
+
+        qDebug().nospace() << "Updated seat cooler to " << this->seatCooler << ".";
+
+        emit seatCoolerChanged();
+    }
+}
+
+bool ClimateControl::getAirCirculation()
+{
+    return this->airCirculation;
+}
+
+void ClimateControl::setAirCirculation(bool newAirCirculation)
+{
+    if (this->airCirculation != newAirCirculation)
+    {
+        // NOTE: This property is not enabled in the current version of AMB, so no D-Bus access is performed.
+        this->airCirculation = newAirCirculation;
+
+        qDebug().nospace() << "Updated air circulation to " << this->airCirculation << ".";
+
+        emit airCirculationChanged();
+    }
+}
+
+quint8 ClimateControl::getSteeringWheelHeater()
+{
+    return this->steeringWheelHeater;
+}
+
+void ClimateControl::setSteeringWheelHeater(quint8 newSteeringWheelHeater)
+{
+    if (this->steeringWheelHeater != newSteeringWheelHeater)
+    {
+        // NOTE: This property is not enabled in the current version of AMB, so no D-Bus access is performed.
+        this->steeringWheelHeater = newSteeringWheelHeater;
+
+        qDebug().nospace() << "Updated steering wheel heater to " << this->steeringWheelHeater << ".";
+
+        emit steeringWheelHeaterChanged();
+    }
+}
+
+// D-Bus connection methods.
+QVariant ClimateControl::dbusRead(const char *property)
+{
+    QString arguments = "R ClimateControl " + QString::fromUtf8(property);
+    QString zoneString;
+
+    // The zone has not been set yet, so do not bother reading from AMB with the exception of FanSpeedLevel at zone 0.
+    if (!this->zone && strcmp(property, "FanSpeedLevel"))
+    {
+        // Return something resembling an uninitialized variable.
+        return 0;
+    }
+
+    // The FanSpeedLevel property is the only property at zone 0 for now.
+    zoneString = QString::number(!strcmp(property, "FanSpeedLevel") ? 0 : this->zone);
+
+    // Add in the zone information.
+    arguments += " " + zoneString;
+
+    qDebug() << "Calling ambdbusaccess with the following arguments:" << arguments;
+
+    // system() returns the result in the upper 8 bits, so shift the result to the right by 8.
+    return system(QString("/usr/lib/qt5/qml/Automotive/ambdbusaccess " + arguments).toStdString().c_str()) >> 8;
+}
+
+void ClimateControl::dbusWrite(const char *property, QVariant value)
+{
+    QString arguments = "W ClimateControl " + QString::fromUtf8(property);
+    QString zoneString;
+
+    // The zone has not been set yet, so do not bother writing to AMB with the exception of FanSpeedLevel at zone 0.
+    if (!this->zone && strcmp(property, "FanSpeedLevel"))
+    {
+        return;
+    }
+
+    // The FanSpeedLevel property is the only property at zone 0 for now.
+    zoneString = QString::number(!strcmp(property, "FanSpeedLevel") ? 0 : this->zone);
+
+    // Add in the zone information and value to write.
+    arguments += " " + zoneString + " " + value.toString();
+
+    qDebug() << "Calling ambdbusaccess with the following arguments:" << arguments;
+
+    system(QString("/usr/lib/qt5/qml/Automotive/ambdbusaccess " + arguments).toStdString().c_str());
+}
+
+void ClimateControl::getSettings()
+{
+    quint8 ambFanSpeedLevel;
+    qint32 ambTargetTemperature;
+
+    //
+    // Go fetch the settings for this zone.
+    //
+    // NOTE: Other properties are not enabled in the current version of AMB, so no D-Bus access is performed for them.
+    //
+    ambFanSpeedLevel = this->dbusRead("FanSpeedLevel").toInt();
+    ambTargetTemperature = this->dbusRead("TargetTemperature").toInt();
+
+    // Call the set methods to generate Qt signals, if any are necessary.
+    this->setFanSpeedLevel(ambFanSpeedLevel);
+    this->setTargetTemperature(ambTargetTemperature);
+}