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/pwl.cpp b/src/ipa/raspberrypi/controller/pwl.cpp
index 8b8db722..fde0b298 100644
--- a/src/ipa/raspberrypi/controller/pwl.cpp
+++ b/src/ipa/raspberrypi/controller/pwl.cpp
@@ -12,7 +12,7 @@
 
 using namespace RPiController;
 
-void Pwl::read(boost::property_tree::ptree const &params)
+int Pwl::read(boost::property_tree::ptree const &params)
 {
 	for (auto it = params.begin(); it != params.end(); it++) {
 		double x = it->second.get_value<double>();
@@ -22,6 +22,7 @@ void Pwl::read(boost::property_tree::ptree const &params)
 		points_.push_back(Point(x, y));
 	}
 	assert(points_.size() >= 2);
+	return 0;
 }
 
 void Pwl::append(double x, double y, const double eps)