ipa: raspberrypi: Return an error code from Algorithm::read()

When encountering errors, the Algorithm::read() function either uses
LOG(Fatal) or throws exceptions from the boost property_tree functions.
To prepare for replacing boost JSON parse with the YamlParser class,
give the Algorithm::read() function the ability to return an error code,
and propagate it all the way to the IPA module init() function.

All algorithm classes return a hardcoded 0 value for now, subsequent
commits will change that.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Naushir Patuck <naush@raspberrypi.com>
Tested-by: Naushir Patuck <naush@raspberrypi.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/src/ipa/raspberrypi/controller/rpi/lux.cpp b/src/ipa/raspberrypi/controller/rpi/lux.cpp
index 95c0a93b..ca1e8271 100644
--- a/src/ipa/raspberrypi/controller/rpi/lux.cpp
+++ b/src/ipa/raspberrypi/controller/rpi/lux.cpp
@@ -38,7 +38,7 @@ char const *Lux::name() const
 	return NAME;
 }
 
-void Lux::read(boost::property_tree::ptree const &params)
+int Lux::read(boost::property_tree::ptree const &params)
 {
 	referenceShutterSpeed_ =
 		params.get<double>("reference_shutter_speed") * 1.0us;
@@ -47,6 +47,7 @@ void Lux::read(boost::property_tree::ptree const &params)
 	referenceY_ = params.get<double>("reference_Y");
 	referenceLux_ = params.get<double>("reference_lux");
 	currentAperture_ = referenceAperture_;
+	return 0;
 }
 
 void Lux::setCurrentAperture(double aperture)