[libcamera-devel] [PATCH v8 2/3] libcamera: camera_sensor: Enable to set a test pattern mode

[Hirokazu Honda]

This adds a function to set a camera sensor driver a test pattern
mode. CameraSensor initializes the test pattern mode by Off.

Signed-off-by: Hirokazu Honda <hiroh at chromium.org>
Reviewed-by: Kieran Bingham <kieran.bingham at ideasonboard.com>
---
 include/libcamera/internal/camera_sensor.h |  6 ++
 src/libcamera/camera_sensor.cpp            | 75 ++++++++++++++++++++--
 2 files changed, 74 insertions(+), 7 deletions(-)

diff --git a/include/libcamera/internal/camera_sensor.h b/include/libcamera/internal/camera_sensor.h
index edef2220..a110fd08 100644
--- a/include/libcamera/internal/camera_sensor.h
+++ b/include/libcamera/internal/camera_sensor.h
@@ -28,6 +28,8 @@ namespace libcamera {
 class BayerFormat;
 class MediaEntity;
 
+struct CameraSensorProperties;
+
 class CameraSensor : protected Loggable
 {
 public:
@@ -47,6 +49,7 @@ public:
 	{
 		return testPatternModes_;
 	}
+	int setTestPatternMode(controls::draft::TestPatternModeEnum testPatternMode);
 
 	V4L2SubdeviceFormat getFormat(const std::vector<unsigned int> &mbusCodes,
 				      const Size &size) const;
@@ -82,6 +85,8 @@ private:
 	std::unique_ptr<V4L2Subdevice> subdev_;
 	unsigned int pad_;
 
+	const CameraSensorProperties *staticProps_;
+
 	std::string model_;
 	std::string id_;
 
@@ -89,6 +94,7 @@ private:
 	std::vector<unsigned int> mbusCodes_;
 	std::vector<Size> sizes_;
 	std::vector<controls::draft::TestPatternModeEnum> testPatternModes_;
+	controls::draft::TestPatternModeEnum testPatternMode_;
 
 	Size pixelArraySize_;
 	Rectangle activeArea_;
diff --git a/src/libcamera/camera_sensor.cpp b/src/libcamera/camera_sensor.cpp
index f0aa9f24..2c6312d4 100644
--- a/src/libcamera/camera_sensor.cpp
+++ b/src/libcamera/camera_sensor.cpp
@@ -54,8 +54,8 @@ LOG_DEFINE_CATEGORY(CameraSensor)
  * Once constructed the instance must be initialized with init().
  */
 CameraSensor::CameraSensor(const MediaEntity *entity)
-	: entity_(entity), pad_(UINT_MAX), bayerFormat_(nullptr),
-	  properties_(properties::properties)
+	: entity_(entity), pad_(UINT_MAX), staticProps_(nullptr),
+	  bayerFormat_(nullptr), properties_(properties::properties)
 {
 }
 
@@ -161,6 +161,21 @@ int CameraSensor::init()
 	if (ret)
 		return ret;
 
+	auto initTestPatternMode = controls::draft::TestPatternModeEnum::TestPatternModeOff;
+	if (staticProps_) {
+		auto it = staticProps_->testPatternModes.find(initTestPatternMode);
+		if (it != staticProps_->testPatternModes.end()) {
+			ControlList ctrls{ controls() };
+			ctrls.set(V4L2_CID_TEST_PATTERN, it->second);
+
+			ret = setControls(&ctrls);
+			if (ret)
+				return ret;
+
+			testPatternMode_ = initTestPatternMode;
+		}
+	}
+
 	return 0;
 }
 
@@ -300,14 +315,14 @@ void CameraSensor::initVimcDefaultProperties()
 
 void CameraSensor::initStaticProperties()
 {
-	const CameraSensorProperties *props = CameraSensorProperties::get(model_);
-	if (!props)
+	staticProps_ = CameraSensorProperties::get(model_);
+	if (!staticProps_)
 		return;
 
 	/* Register the properties retrieved from the sensor database. */
-	properties_.set(properties::UnitCellSize, props->unitCellSize);
+	properties_.set(properties::UnitCellSize, staticProps_->unitCellSize);
 
-	initTestPatternModes(props->testPatternModes);
+	initTestPatternModes(staticProps_->testPatternModes);
 }
 
 void CameraSensor::initTestPatternModes(
@@ -315,7 +330,17 @@ void CameraSensor::initTestPatternModes(
 {
 	const auto &v4l2TestPattern = controls().find(V4L2_CID_TEST_PATTERN);
 	if (v4l2TestPattern == controls().end()) {
-		LOG(CameraSensor, Debug) << "No static test pattern map for \'"
+		LOG(CameraSensor, Debug)
+			<< "V4L2_CID_TEST_PATTERN is not supported";
+		return;
+	}
+
+	if (testPatternModes.empty()) {
+		/*
+		 * The camera sensor supports test patterns but we don't know
+		 * how to map them so this should be fixed.
+		 */
+		LOG(CameraSensor, Error) << "No static test pattern map for \'"
 					 << model() << "\'";
 		return;
 	}
@@ -531,6 +556,42 @@ Size CameraSensor::resolution() const
  * \return The list of test pattern modes
  */
 
+/**
+ * \brief Set the test pattern mode for the camera sensor
+ * \param[in] testPatternMode Test pattern mode control value to set the camera
+ * sensor
+ *
+ * \return 0 on success or a negative error code otherwise
+ */
+int CameraSensor::setTestPatternMode(controls::draft::TestPatternModeEnum testPatternMode)
+{
+	if (testPatternMode_ == testPatternMode)
+		return 0;
+
+	if (!staticProps_ || testPatternModes_.empty())
+		return 0;
+
+	auto it = std::find(testPatternModes_.begin(), testPatternModes_.end(),
+			    testPatternMode);
+	if (it == testPatternModes_.end()) {
+		LOG(CameraSensor, Error) << "Unsupported test pattern mode "
+					 << testPatternMode;
+		return -EINVAL;
+	}
+
+	int32_t index = staticProps_->testPatternModes.at(testPatternMode);
+	ControlList ctrls{ controls() };
+	ctrls.set(V4L2_CID_TEST_PATTERN, index);
+
+	int ret = setControls(&ctrls);
+	if (ret)
+		return ret;
+
+	testPatternMode_ = testPatternMode;
+
+	return 0;
+}
+
 /**
  * \brief Retrieve the best sensor format for a desired output
  * \param[in] mbusCodes The list of acceptable media bus codes
-- 
2.34.0.rc2.393.gf8c9666880-goog