Add API for duplicate skipping

Duplicate skipping enables omitting reading values
that are very similar to the previous one, thus saving
processing power.

Implement this for the Blackberry backend.

Change-Id: Ic608d8ca795b5a2e0bca5a75a62e8005c283c620
Reviewed-by: Thomas McGuire <thomas.mcguire@kdab.com>

1 files changed, 11 insertions, 0 deletions

diff --git a/src/plugins/sensors/blackberry/bbsensorbackend.cpp b/src/plugins/sensors/blackberry/bbsensorbackend.cpp
index 324929fd..9850d4dd 100644
--- a/src/plugins/sensors/blackberry/bbsensorbackend.cpp
+++ b/src/plugins/sensors/blackberry/bbsensorbackend.cpp
@@ -254,6 +254,16 @@ void BbSensorBackendBase::start()
         }
     }
 
+    // Enable/disable duplicate skipping
+    sensor_devctl_skipdupevent_u deviceSkip;
+    deviceSkip.tx.enable = sensor()->skipDuplicates();
+    const int result = devctl(deviceFile().handle(), DCMD_SENSOR_SKIPDUPEVENT, &deviceSkip,
+                              sizeof(deviceSkip), NULL);
+    if (result != EOK) {
+        perror(QString::fromLatin1("Setting duplicate skipping for %1 failed")
+               .arg(m_deviceFile.fileName()).toLocal8Bit());
+    }
+
     // Explicitly switch to non-blocking mode, otherwise read() will wait until new sensor
     // data is available, and we have no way to check if there is more data or not (bytesAvailable()
     // does not work for unbuffered mode)
@@ -299,6 +309,7 @@ bool BbSensorBackendBase::isFeatureSupported(QSensor::Feature feature) const
     case QSensor::AlwaysOn:
     case QSensor::Buffering:
     case QSensor::AccelerationMode:
+    case QSensor::SkipDuplicates:
         return true;
     case QSensor::Reserved:
     case QSensor::GeoValues: