libdebug: Add common debug utility.

- Add sdm and drm independent debug utility.

CRs-Fixed: 2211061
Change-Id: I48f9d8080ce05cff0ac0982f8e7123fec969e695

1 files changed, 60 insertions, 0 deletions

diff --git a/libdebug/debug_handler.cpp b/libdebug/debug_handler.cpp
new file mode 100644
index 00000000..00c3ec9f
--- /dev/null
+++ b/libdebug/debug_handler.cpp
@@ -0,0 +1,60 @@
+/*
+* Copyright (c) 2018, The Linux Foundation. All rights reserved.
+*
+* Redistribution and use in source and binary forms, with or without
+* modification, are permitted provided that the following conditions are
+* met:
+*     * Redistributions of source code must retain the above copyright
+*       notice, this list of conditions and the following disclaimer.
+*     * Redistributions in binary form must reproduce the above
+*       copyright notice, this list of conditions and the following
+*       disclaimer in the documentation and/or other materials provided
+*       with the distribution.
+*     * Neither the name of The Linux Foundation nor the names of its
+*       contributors may be used to endorse or promote products derived
+*       from this software without specific prior written permission.
+*
+* THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
+* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
+* ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
+* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+#include "debug_handler.h"
+
+namespace display {
+
+// By default, drop any log messages/traces. It need to be overridden by client.
+class DefaultDebugHandler : public DebugHandler {
+ public:
+  virtual void Error(const char *, ...) { }
+  virtual void Warning(const char *, ...) { }
+  virtual void Info(const char *, ...) { }
+  virtual void Debug(const char *, ...) { }
+  virtual void Verbose(const char *, ...) { }
+  virtual void BeginTrace(const char *, const char *, const char *) { }
+  virtual void EndTrace() { }
+  virtual int GetProperty(const char *, int *) { return -1; }
+  virtual int GetProperty(const char *, char *) { return -1; }
+};
+
+DefaultDebugHandler g_default_debug_handler;
+DebugHandler * DebugHandler::debug_handler_ = &g_default_debug_handler;
+std::bitset<32> DebugHandler::log_mask_ = 0x1;  // Always print logs tagged with value 0
+
+void DebugHandler::Set(DebugHandler *debug_handler) {
+  if (debug_handler) {
+    debug_handler_ = debug_handler;
+  } else {
+    debug_handler_ = &g_default_debug_handler;
+  }
+}
+
+}  // namespace display