Add QCanBusDevice::busStatus()

The original terminology is Error active, Error warning,
Error Passive and Bus Off. We map them to GoodStatus,
WarningStatus, ErrorStatus and BusOffStatus here.

[ChangeLog][QCanBusDevice] Added the function busStatus()
to query the CAN bus status from the CAN bus device.

Fixes: QTBUG-70766
Change-Id: I22b99e2a02a6b22509005dd177796b861d536281
Reviewed-by: Alex Blasche <alexander.blasche@qt.io>

2 files changed, 23 insertions, 0 deletions

diff --git a/src/plugins/canbus/peakcan/peakcanbackend.cpp b/src/plugins/canbus/peakcan/peakcanbackend.cpp
index 30d3b8c..b1a991d 100644
--- a/src/plugins/canbus/peakcan/peakcanbackend.cpp
+++ b/src/plugins/canbus/peakcan/peakcanbackend.cpp
@@ -720,6 +720,9 @@ PeakCanBackend::PeakCanBackend(const QString &name, QObject *parent)
 
     std::function<void()> f = std::bind(&PeakCanBackend::resetController, this);
     setResetControllerFunction(f);
+
+    std::function<CanBusStatus()> g = std::bind(&PeakCanBackend::busStatus, this);
+    setCanBusStatusGetter(g);
 }
 
 PeakCanBackend::~PeakCanBackend()
@@ -817,4 +820,23 @@ void PeakCanBackend::resetController()
     open();
 }
 
+QCanBusDevice::CanBusStatus PeakCanBackend::busStatus() const
+{
+    const TPCANStatus status = ::CAN_GetStatus(d_ptr->channelIndex);
+
+    switch (status & PCAN_ERROR_ANYBUSERR) {
+    case PCAN_ERROR_OK:
+        return QCanBusDevice::CanBusStatus::Good;
+    case PCAN_ERROR_BUSWARNING:
+        return QCanBusDevice::CanBusStatus::Warning;
+    case PCAN_ERROR_BUSPASSIVE:
+        return QCanBusDevice::CanBusStatus::Error;
+    case PCAN_ERROR_BUSOFF:
+        return QCanBusDevice::CanBusStatus::BusOff;
+    default:
+        qCWarning(QT_CANBUS_PLUGINS_PEAKCAN, "Unknown CAN bus status: %lu.", ulong(status));
+        return QCanBusDevice::CanBusStatus::Unknown;
+    }
+}
+
 QT_END_NAMESPACE
diff --git a/src/plugins/canbus/peakcan/peakcanbackend.h b/src/plugins/canbus/peakcan/peakcanbackend.h
index 6a9cda2..a9e108e 100644
--- a/src/plugins/canbus/peakcan/peakcanbackend.h
+++ b/src/plugins/canbus/peakcan/peakcanbackend.h
@@ -73,6 +73,7 @@ public:
 
 private:
     void resetController();
+    CanBusStatus busStatus() const;
 
     PeakCanBackendPrivate * const d_ptr;
 };