[libcamera-devel] [PATCH 6/9] libcamera: camera_sensor: Expose a DelayedControls interface

[Niklas Söderlund]

Expose the optional DelayedControls interface to pipeline handlers. If
used by a pipeline generic delays are used. In the future the delay
values should be fetched to match the specific sensor module, either
from a new kernel interface or worst case a sensors database.

Signed-off-by: Niklas Söderlund <niklas.soderlund at ragnatech.se>
---
 include/libcamera/internal/camera_sensor.h |  5 ++++
 src/libcamera/camera_sensor.cpp            | 31 ++++++++++++++++++++++
 2 files changed, 36 insertions(+)

diff --git a/include/libcamera/internal/camera_sensor.h b/include/libcamera/internal/camera_sensor.h
index b9eba89f00fba882..6be1cfd49134c534 100644
--- a/include/libcamera/internal/camera_sensor.h
+++ b/include/libcamera/internal/camera_sensor.h
@@ -14,6 +14,7 @@
 #include <libcamera/controls.h>
 #include <libcamera/geometry.h>
 
+#include "libcamera/internal/delayed_controls.h"
 #include "libcamera/internal/formats.h"
 #include "libcamera/internal/log.h"
 #include "libcamera/internal/v4l2_subdevice.h"
@@ -61,6 +62,8 @@ public:
 	ControlList getControls(const std::vector<uint32_t> &ids);
 	int setControls(ControlList *ctrls);
 
+	DelayedControls *delayedContols();
+
 	const ControlList &properties() const { return properties_; }
 	int sensorInfo(CameraSensorInfo *info) const;
 
@@ -83,6 +86,8 @@ private:
 	std::vector<Size> sizes_;
 
 	ControlList properties_;
+
+	std::unique_ptr<DelayedControls> delayedControls_;
 };
 
 } /* namespace libcamera */
diff --git a/src/libcamera/camera_sensor.cpp b/src/libcamera/camera_sensor.cpp
index 935de528c4963453..6c92c97f4cc2547a 100644
--- a/src/libcamera/camera_sensor.cpp
+++ b/src/libcamera/camera_sensor.cpp
@@ -493,6 +493,37 @@ int CameraSensor::setControls(ControlList *ctrls)
 	return subdev_->setControls(ctrls);
 }
 
+/**
+ * \brief Get the sensors delayed controls interface
+ *
+ * Access the sensors delayed controls interface. This interface aids pipelines
+ * keeping tack of controls that needs time to take effect. The interface is
+ * optional to use and does not interact with setControls() and getControls()
+ * that operates directly on the sensor device.
+ *
+ * \sa DelayedControls
+ * \return The delayed controls interface
+ */
+DelayedControls *CameraSensor::delayedContols()
+{
+	if (!delayedControls_) {
+		/*
+		 * \todo Read dealy values from the sensor itself or from a
+		 * a sensor database. For now use generic values taken from
+		 * the Raspberry Pi and listed as generic values.
+		 */
+		std::unordered_map<uint32_t, unsigned int> delays = {
+			{ V4L2_CID_ANALOGUE_GAIN, 1 },
+			{ V4L2_CID_EXPOSURE, 2 },
+		};
+
+		delayedControls_ =
+			std::make_unique<DelayedControls>(subdev_.get(), delays);
+	}
+
+	return delayedControls_.get();
+}
+
 /**
  * \brief Assemble and return the camera sensor info
  * \param[out] info The camera sensor info
-- 
2.29.1