libcamera: pipeline: vimc: add pipeline handler for vimc

Provide a pipeline handler for the virtual vimc driver.

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

src/libcamera/meson.build

@@ -21,6 +21,8 @@ includes = [
     libcamera_internal_includes,
 ]
 
+subdir('pipeline')
+
 libudev = dependency('libudev')
 
 libcamera = shared_library('camera',

src/libcamera/pipeline/meson.build

@@ -0,0 +1,3 @@
+libcamera_sources += files([
+    'vimc.cpp',
+])

src/libcamera/pipeline/vimc.cpp

@@ -0,0 +1,92 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2018, Google Inc.
+ *
+ * vimc.cpp - Pipeline handler for the vimc device
+ */
+
+#include <libcamera/camera.h>
+
+#include "device_enumerator.h"
+#include "pipeline_handler.h"
+
+namespace libcamera {
+
+class PipeHandlerVimc : public PipelineHandler
+{
+public:
+	PipeHandlerVimc();
+	~PipeHandlerVimc();
+
+	bool match(DeviceEnumerator *enumerator);
+
+	unsigned int count();
+	Camera *camera(unsigned int id) final;
+
+private:
+	DeviceInfo *info_;
+	Camera *camera_;
+};
+
+PipeHandlerVimc::PipeHandlerVimc()
+	: info_(nullptr), camera_(nullptr)
+{
+}
+
+PipeHandlerVimc::~PipeHandlerVimc()
+{
+	if (camera_)
+		camera_->put();
+
+	if (info_)
+		info_->release();
+}
+
+unsigned int PipeHandlerVimc::count()
+{
+	return 1;
+}
+
+Camera *PipeHandlerVimc::camera(unsigned int id)
+{
+	if (id != 0)
+		return nullptr;
+
+	return camera_;
+}
+
+bool PipeHandlerVimc::match(DeviceEnumerator *enumerator)
+{
+	DeviceMatch dm("vimc");
+
+	dm.add("Raw Capture 0");
+	dm.add("Raw Capture 1");
+	dm.add("RGB/YUV Capture");
+	dm.add("Sensor A");
+	dm.add("Sensor B");
+	dm.add("Debayer A");
+	dm.add("Debayer B");
+	dm.add("RGB/YUV Input");
+	dm.add("Scaler");
+
+	info_ = enumerator->search(dm);
+	if (!info_)
+		return false;
+
+	info_->acquire();
+
+	/*
+	 * NOTE: A more complete Camera implementation could
+	 * be passed the DeviceInfo(s) it controls here or
+	 * a reference to the PipelineHandler. Which method
+	 * will be chosen depends on how the Camera
+	 * object is modeled.
+	 */
+	camera_ = new Camera("Dummy VIMC Camera");
+
+	return true;
+}
+
+REGISTER_PIPELINE_HANDLER(PipeHandlerVimc);
+
+} /* namespace libcamera */