ipa: Move vimc to a subdirectory

Give a subdirectory to all IPA modules to make the structure of the
source tree more consistent. This will also simplify the implementation
of IPA module selection at build time.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>

src/ipa/vimc/vimc.cpp

@@ -0,0 +1,119 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2019, Google Inc.
+ *
+ * ipa_vimc.cpp - Vimc Image Processing Algorithm module
+ */
+
+#include <ipa/ipa_vimc.h>
+
+#include <fcntl.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+#include <iostream>
+
+#include <ipa/ipa_interface.h>
+#include <ipa/ipa_module_info.h>
+
+#include <libipa/ipa_interface_wrapper.h>
+
+#include "log.h"
+
+namespace libcamera {
+
+LOG_DEFINE_CATEGORY(IPAVimc)
+
+class IPAVimc : public IPAInterface
+{
+public:
+	IPAVimc();
+	~IPAVimc();
+
+	int init() override;
+	void configure(const std::map<unsigned int, IPAStream> &streamConfig,
+		       const std::map<unsigned int, const ControlInfoMap &> &entityControls) override {}
+	void mapBuffers(const std::vector<IPABuffer> &buffers) override {}
+	void unmapBuffers(const std::vector<unsigned int> &ids) override {}
+	void processEvent(const IPAOperationData &event) override {}
+
+private:
+	void initTrace();
+	void trace(enum IPAOperationCode operation);
+
+	int fd_;
+};
+
+IPAVimc::IPAVimc()
+	: fd_(-1)
+{
+	initTrace();
+}
+
+IPAVimc::~IPAVimc()
+{
+	if (fd_)
+		::close(fd_);
+}
+
+int IPAVimc::init()
+{
+	trace(IPAOperationInit);
+
+	LOG(IPAVimc, Debug) << "initializing vimc IPA!";
+
+	return 0;
+}
+
+void IPAVimc::initTrace()
+{
+	struct stat fifoStat;
+	int ret = stat(VIMC_IPA_FIFO_PATH, &fifoStat);
+	if (ret)
+		return;
+
+	ret = ::open(VIMC_IPA_FIFO_PATH, O_WRONLY);
+	if (ret < 0) {
+		ret = errno;
+		LOG(IPAVimc, Error) << "Failed to open vimc IPA test FIFO: "
+				    << strerror(ret);
+		return;
+	}
+
+	fd_ = ret;
+}
+
+void IPAVimc::trace(enum IPAOperationCode operation)
+{
+	if (fd_ < 0)
+		return;
+
+	int ret = ::write(fd_, &operation, sizeof(operation));
+	if (ret < 0) {
+		ret = errno;
+		LOG(IPAVimc, Error) << "Failed to write to vimc IPA test FIFO: "
+				    << strerror(ret);
+	}
+}
+
+/*
+ * External IPA module interface
+ */
+
+extern "C" {
+const struct IPAModuleInfo ipaModuleInfo = {
+	IPA_MODULE_API_VERSION,
+	0,
+	"PipelineHandlerVimc",
+	"Dummy IPA for Vimc",
+	LICENSE,
+};
+
+struct ipa_context *ipaCreate()
+{
+	return new IPAInterfaceWrapper(std::make_unique<IPAVimc>());
+}
+}
+
+} /* namespace libcamera */