ipa: vimc: Add support for tracing operations

Add support to the dummy VIMC IPA for tracing operation by using a FIFO
channel that will be used by the IPA Interface test to verify
communications with the IPA.

At the moment only add support for the init() operation as it's the only
defined one.

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>

2 files changed, 89 insertions, 1 deletions

diff --git a/include/ipa/ipa_vimc.h b/include/ipa/ipa_vimc.h
new file mode 100644
index 00000000..05b561d8
--- /dev/null
+++ b/include/ipa/ipa_vimc.h
@@ -0,0 +1,22 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2019, Google Inc.
+ *
+ * ipa_vimc.h - Vimc Image Processing Algorithm module
+ */
+
+#ifndef __LIBCAMERA_IPA_VIMC_H__
+#define __LIBCAMERA_IPA_VIMC_H__
+
+namespace libcamera {
+
+#define VIMC_IPA_FIFO_PATH "/tmp/libcamera_ipa_vimc_fifo"
+
+enum IPAOperationCode {
+	IPAOperationNone,
+	IPAOperationInit,
+};
+
+}; /* namespace libcamera */
+
+#endif /* __LIBCAMERA_IPA_VIMC_H__ */
diff --git a/src/ipa/ipa_vimc.cpp b/src/ipa/ipa_vimc.cpp
index abc06e7f..70d28fe2 100644
--- a/src/ipa/ipa_vimc.cpp
+++ b/src/ipa/ipa_vimc.cpp
@@ -5,25 +5,91 @@
  * 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 "log.h"
+
 namespace libcamera {
 
+LOG_DEFINE_CATEGORY(IPAVimc)
+
 class IPAVimc : public IPAInterface
 {
 public:
+	IPAVimc();
+	~IPAVimc();
+
 	int init();
+
+private:
+	void initTrace();
+	void trace(enum IPAOperationCode operation);
+
+	int fd_;
 };
 
+IPAVimc::IPAVimc()
+	: fd_(-1)
+{
+	initTrace();
+}
+
+IPAVimc::~IPAVimc()
+{
+	if (fd_)
+		::close(fd_);
+}
+
 int IPAVimc::init()
 {
-	std::cout << "initializing vimc IPA!" << std::endl;
+	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
  */