6 files changed, 54 insertions, 7 deletions
diff --git a/pcilib/CMakeLists.txt b/pcilib/CMakeLists.txt
index 70bd5f0..b1b56bf 100644
--- a/pcilib/CMakeLists.txt
+++ b/pcilib/CMakeLists.txt
@@ -3,8 +3,8 @@ include_directories(
     ${CMAKE_SOURCE_DIR}/pcilib
 )
 
-set(HEADERS pcilib.h pci.h export.h model.h bank.h register.h kmem.h irq.h dma.h event.h plugin.h tools.h error.h config.h)
-add_library(pcilib SHARED pci.c export.c model.c bank.c register.c kmem.c irq.c dma.c event.c plugin.c tools.c error.c)
+set(HEADERS pcilib.h pci.h export.h model.h bank.h register.h kmem.h irq.h dma.h event.h plugin.h tools.h error.h debug.h config.h)
+add_library(pcilib SHARED pci.c export.c model.c bank.c register.c kmem.c irq.c dma.c event.c plugin.c tools.c error.c debug.c)
 target_link_libraries(pcilib dma protocols ${CMAKE_THREAD_LIBS_INIT} ${UFODECODE_LIBRARIES} ${CMAKE_DL_LIBS})
 add_dependencies(pcilib dma protocols)
 
@@ -16,6 +16,6 @@ install(FILES pcilib.h
     DESTINATION include
 )
 
-install(FILES bank.h register.h dma.h event.h model.h error.h tools.h export.h
+install(FILES bank.h register.h dma.h event.h model.h error.h debug.h tools.h export.h
     DESTINATION include/pcilib
 )
diff --git a/pcilib/debug.c b/pcilib/debug.c
new file mode 100644
index 0000000..f07e1e6
--- /dev/null
+++ b/pcilib/debug.c
@@ -0,0 +1,16 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdarg.h>
+
+#include "error.h"
+
+void pcilib_debug_message(const char *function, const char *file, int line, const char *format, ...) {
+    va_list va;
+
+    if (!getenv(function)) return;
+
+    va_start(va, format);
+    pcilib_log_vmessage(file, line, PCILIB_LOG_DEBUG, format, va);
+    va_end(va);
+}
+
diff --git a/pcilib/debug.h b/pcilib/debug.h
new file mode 100644
index 0000000..f9134be
--- /dev/null
+++ b/pcilib/debug.h
@@ -0,0 +1,23 @@
+#ifndef _PCILIB_DEBUG_H
+#define _PCILIB_DEBUG_H
+
+#define PCILIB_DEBUG
+
+#ifdef PCILIB_DEBUG
+# define PCILIB_DEBUG_DMA
+#endif /* PCILIB_DEBUG */
+
+
+#ifdef PCILIB_DEBUG_DMA
+# define PCILIB_DEBUG_DMA_CALL(function, ...) pcilib_debug_message (#function, __FILE__, __LINE__, __VA_ARGS__) 
+#else /* PCILIB_DEBUG_DMA */
+# define PCILIB_DEBUG_DMA_CALL(function, ...)
+#endif /* PCILIB_DEBUG_DMA */
+
+#define pcilib_debug(function, ...) \
+    PCILIB_DEBUG_##function##_CALL(PCILIB_DEBUG_##function, __VA_ARGS__)
+
+void pcilib_debug_message(const char *function, const char *file, int line, const char *format, ...);
+
+
+#endif /* _PCILIB_DEBUG_H */
diff --git a/pcilib/error.c b/pcilib/error.c
index 538534b..ad38622 100644
--- a/pcilib/error.c
+++ b/pcilib/error.c
@@ -19,13 +19,19 @@ static pcilib_logger_t pcilib_logger = pcilib_print_error;
 void pcilib_log_message(const char *file, int line, pcilib_log_priority_t prio, const char *msg, ...) {
     va_list va;
 
-    if (prio >= pcilib_logger_min_prio) {
+    if ((!prio)||(prio >= pcilib_logger_min_prio)) {
 	va_start(va, msg);
 	pcilib_logger(pcilib_logger_argument, file, line, prio, msg, va);
 	va_end(va);
     }
 }
 
+void pcilib_log_vmessage(const char *file, int line, pcilib_log_priority_t prio, const char *msg, va_list va) {
+    if ((!prio)||(prio >= pcilib_logger_min_prio)) {
+	pcilib_logger(pcilib_logger_argument, file, line, prio, msg, va);
+    }
+}
+
 
 int pcilib_set_logger(pcilib_log_priority_t min_prio, pcilib_logger_t logger, void *arg) {
     pcilib_logger_min_prio = min_prio;
diff --git a/pcilib/error.h b/pcilib/error.h
index 5b5f8b1..e94fd25 100644
--- a/pcilib/error.h
+++ b/pcilib/error.h
@@ -27,6 +27,7 @@ enum {
 } pcilib_errot_t;
 
 void pcilib_log_message(const char *file, int line, pcilib_log_priority_t prio, const char *msg, ...);
+void pcilib_log_vmessage(const char *file, int line, pcilib_log_priority_t prio, const char *msg, va_list va);
 
 #define pcilib_log(prio, ...) \
     pcilib_log_message(__FILE__, __LINE__, prio, __VA_ARGS__)
diff --git a/pcilib/pcilib.h b/pcilib/pcilib.h
index 232daf8..f5853d3 100644
--- a/pcilib/pcilib.h
+++ b/pcilib/pcilib.h
@@ -23,9 +23,10 @@ typedef unsigned int pcilib_irq_hw_source_t;
 typedef uint32_t pcilib_irq_source_t;
 
 typedef enum {
-    PCILIB_LOG_INFO,
-    PCILIB_LOG_WARNING,
-    PCILIB_LOG_ERROR
+    PCILIB_LOG_DEBUG = 0,			/**< Debug messages will be always printed as they should be filtered based on setting of corresponding environmental variable */
+    PCILIB_LOG_INFO,				/**< Informational message are suppresed by default */
+    PCILIB_LOG_WARNING,				/**< Warnings messages indicate that something unexpected happen, but application can continue */
+    PCILIB_LOG_ERROR				/**< The error which is impossible to handle on this level of library */
 } pcilib_log_priority_t;
 
 typedef enum {