cmake: add -DFTDID2xx and use FindFtd2xx.cmake

Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>

src/CMakeLists.txt

@@ -50,8 +50,16 @@ endif()
 if (USBPLAT)
   add_subdirectory(usb)
   set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -DUSBPLAT=1")
-  set (mraa_LIBS ${mraa_LIBS} ft4222)
-endif()
+  find_package (Ftd2xx)
+  if (FTDID2xx)
+    if (${LIBFTD2XX_FOUND})
+      set (CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -DFTDID2XX=1")
+      set (mraa_LIBS ${mraa_LIBS} ${LIBFTD2XX_LIBRARIES})
+    else ()
+      message (WARNING " - Enabled FTDID2xx support but library not found")
+    endif ()
+  endif ()
+endif ()
 
 
 set (mraa_LIB_SRCS

src/mraa.c

@@ -115,11 +115,12 @@ mraa_init()
     // This is a platform extender so create null base platform if one doesn't already exist
     if (plat == NULL) {
         plat = (mraa_board_t*) calloc(1, sizeof(mraa_board_t));
-        plat->platform_name = "Null platform";
+        plat->platform_name = "Unknown platform";
         if (plat != NULL) {
             int usb_platform_type = mraa_usb_platform_extender(plat);
-            if (platform_type == MRAA_UNKNOWN_PLATFORM)
+            if (platform_type == MRAA_UNKNOWN_PLATFORM) {
                 platform_type = usb_platform_type;
+            }
         }
     }
     if (plat == NULL) {

src/usb/CMakeLists.txt

@@ -1,7 +1,12 @@
 message (INFO " - Adding USB platforms")
 set (mraa_LIB_SRCS_NOAUTO ${mraa_LIB_SRCS_NOAUTO}
   ${PROJECT_SOURCE_DIR}/src/usb/usb.c
-  ${PROJECT_SOURCE_DIR}/src/usb/ftdi_ft4222.c
   PARENT_SCOPE
 )
+if (FTDID2XX)
+  set (mraa_LIB_SRCS_NOAUTO
+    ${PROJECT_SOURCE_DIR}/src/usb/ftdi_ft4222.c
+    PARENT_SCOPE
+  )
+endif ()
 

src/usb/usb.c

@@ -26,13 +26,16 @@
 #include <string.h>
 
 #include "mraa_internal.h"
+#ifdef FTDID2XX
 #include "usb/ftdi_ft4222.h"
+#endif
 
 
 mraa_platform_t
 mraa_usb_platform_extender(mraa_board_t* board)
 {
     mraa_platform_t platform_type = MRAA_UNKNOWN_PLATFORM;
+#ifdef FTDID2XX
     if (mraa_ftdi_ft4222_init() == MRAA_SUCCESS) {
         unsigned int versionChip, versionLib;
         if (mraa_ftdi_ft4222_get_version(&versionChip, &versionLib) == MRAA_SUCCESS) {
@@ -47,5 +50,6 @@ mraa_usb_platform_extender(mraa_board_t* board)
         default:
             syslog(LOG_ERR, "Unknown USB Platform Extender, currently not supported by MRAA");
     }
+#endif
     return platform_type;
 }