SocketCAN: Set and get bitrate by loading libsocketcan dynamically

Can be extended for further functions from this library also.

[ChangeLog][Plugins][SocketCAN] If libsocketcan is available,
the CAN bus bitrate can be get and set at runtime.

Fixes: QTBUG-54296
Change-Id: Ie677ddb5cf4ee9f99927973d837ef7a2810a2b37
Reviewed-by: Rolf Eike Beer <eb@emlix.com>
Reviewed-by: Denis Shienkov <denis.shienkov@gmail.com>

1 files changed, 20 insertions, 0 deletions

diff --git a/src/plugins/canbus/socketcan/socketcanbackend.cpp b/src/plugins/canbus/socketcan/socketcanbackend.cpp
index 74b0d1d..cac1db5 100644
--- a/src/plugins/canbus/socketcan/socketcanbackend.cpp
+++ b/src/plugins/canbus/socketcan/socketcanbackend.cpp
@@ -36,6 +36,10 @@
 
 #include "socketcanbackend.h"
 
+#include "libsocketcan.h"
+
+#include <QtSerialBus/qcanbusdevice.h>
+
 #include <QtCore/qdatastream.h>
 #include <QtCore/qdebug.h>
 #include <QtCore/qdiriterator.h>
@@ -181,6 +185,14 @@ QList<QCanBusDeviceInfo> SocketCanBackend::interfaces()
 SocketCanBackend::SocketCanBackend(const QString &name) :
     canSocketName(name)
 {
+    QString errorString;
+    libSocketCan.reset(new LibSocketCan(&errorString));
+    if (Q_UNLIKELY(!errorString.isEmpty())) {
+        qCInfo(QT_CANBUS_PLUGINS_SOCKETCAN,
+               "Cannot load library libsocketcan, some functionality will not be available.\n%ls",
+               qUtf16Printable(errorString));
+    }
+
     resetConfigurations();
 }
 
@@ -200,6 +212,8 @@ void SocketCanBackend::resetConfigurations()
                 QVariant::fromValue(QCanBusFrame::FrameErrors(QCanBusFrame::AnyError)));
     QCanBusDevice::setConfigurationParameter(
                 QCanBusDevice::CanFdKey, false);
+    QCanBusDevice::setConfigurationParameter(
+                QCanBusDevice::BitRateKey, 500000);
 }
 
 bool SocketCanBackend::open()
@@ -345,6 +359,12 @@ bool SocketCanBackend::applyConfigurationParameter(int key, const QVariant &valu
         success = true;
         break;
     }
+    case QCanBusDevice::BitRateKey:
+    {
+        const quint32 bitRate = value.toUInt();
+        libSocketCan->setBitrate(canSocketName, bitRate);
+        break;
+    }
     default:
         setError(tr("SocketCanBackend: No such configuration as %1 in SocketCanBackend").arg(key),
                  QCanBusDevice::CanBusError::ConfigurationError);