All sensors should return a target speed value

All tach sensors associated with a fan should return a target speed
sensor from its getTarget function. In the case where a target speed
sensor does not exist for the tach sensor, it retrieves and returns the
target speed value from the fan where the fan finds the target speed
value from a tach sensor the fan contains that provides it.

Resolves openbmc/openbmc#2784

Change-Id: Iea5561b0aad6942be52af262c7255c60e5e75c7a
Signed-off-by: Matthew Barth <msbarth@us.ibm.com>

1 files changed, 9 insertions, 1 deletions

diff --git a/monitor/tach_sensor.cpp b/monitor/tach_sensor.cpp
index 8ae8583..1069313 100644
--- a/monitor/tach_sensor.cpp
+++ b/monitor/tach_sensor.cpp
@@ -126,13 +126,21 @@ TachSensor::TachSensor(sdbusplus::bus::bus& bus,
 
 }
 
-
 std::string TachSensor::getMatchString(const std::string& interface)
 {
     return sdbusplus::bus::match::rules::propertiesChanged(
             _name, interface);
 }
 
+uint64_t TachSensor::getTarget() const
+{
+    if (!_hasTarget)
+    {
+        return _fan.findTargetSpeed();
+    }
+    return _tachTarget;
+}
+
 void TachSensor::setFunctional(bool functional)
 {
     _functional = functional;