libcamera: ipu3: cio2: Report format and sizes

Add two methods to the CIO2Device class to retrieve all the supported
PixelFormats and sizes.

Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>

src/libcamera/pipeline/ipu3/cio2.cpp

@@ -10,6 +10,7 @@
 #include <linux/media-bus-format.h>
 
 #include <libcamera/formats.h>
+#include <libcamera/geometry.h>
 #include <libcamera/stream.h>
 
 #include "libcamera/internal/camera_sensor.h"
@@ -43,6 +44,45 @@ CIO2Device::~CIO2Device()
 	delete sensor_;
 }
 
+/**
+ * \brief Retrieve the list of supported PixelFormats
+ *
+ * Retrieve the list of supported pixel formats by matching the sensor produced
+ * media bus codes with the formats supported by the CIO2 unit.
+ *
+ * \return The list of supported PixelFormat
+ */
+std::vector<PixelFormat> CIO2Device::formats() const
+{
+	if (!sensor_)
+		return {};
+
+	std::vector<PixelFormat> formats;
+	for (unsigned int code : sensor_->mbusCodes()) {
+		auto it = mbusCodesToPixelFormat.find(code);
+		if (it != mbusCodesToPixelFormat.end())
+			formats.push_back(it->second);
+	}
+
+	return formats;
+}
+
+/**
+ * \brief Retrieve the list of supported size ranges
+ * \return The list of supported SizeRange
+ */
+std::vector<SizeRange> CIO2Device::sizes() const
+{
+	if (!sensor_)
+		return {};
+
+	std::vector<SizeRange> sizes;
+	for (const Size &size : sensor_->sizes())
+		sizes.emplace_back(size, size);
+
+	return sizes;
+}
+
 /**
  * \brief Initialize components of the CIO2 device with \a index
  * \param[in] media The CIO2 media device

src/libcamera/pipeline/ipu3/cio2.h

@@ -20,8 +20,10 @@ namespace libcamera {
 class CameraSensor;
 class FrameBuffer;
 class MediaDevice;
+class PixelFormat;
 class Request;
 class Size;
+class SizeRange;
 class V4L2Subdevice;
 struct StreamConfiguration;
 
@@ -33,6 +35,9 @@ public:
 	CIO2Device();
 	~CIO2Device();
 
+	std::vector<PixelFormat> formats() const;
+	std::vector<SizeRange> sizes() const;
+
 	int init(const MediaDevice *media, unsigned int index);
 	int configure(const Size &size, V4L2DeviceFormat *outputFormat);