cmake: add FTDI FT4222 support

Existing FTDI D2xx support is just for serial comms library
but FT4222 needs a different library for i2c operation.

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

cmake/modules/FindFtd4222.cmake

@@ -0,0 +1,75 @@
+# - Try to find LIBFT4222
+# Once done this will define
+#
+#  LIBFT4222_FOUND - system has LIBFT4222
+#  LIBFT4222_INCLUDE_DIRS - the LIBFT4222 include directory
+#  LIBFT4222_LIBRARIES - Link these to use LIBFT4222
+#  LIBFT4222_DEFINITIONS - Compiler switches required for using LIBFT4222
+#
+#  Adapted from cmake-modules Google Code project
+#
+#  Copyright (c) 2006 Andreas Schneider <mail@cynapses.org>
+#
+#  (Changes for LIBFTD2XX) Copyright (c) 2008 Kyle Machulis <kyle@nonpolynomial.com>
+#  (Changes for LIBFT4222) Henry Bruce <henry.bruce@intel.com> Copyright (c) 2015 Intel Corporation. 
+#
+# Redistribution and use is allowed according to the terms of the New BSD license.
+# For details see the accompanying COPYING-CMAKE-SCRIPTS file.
+
+if (LIBFT4222_LIBRARIES AND LIBFT4222_INCLUDE_DIRS)
+  # in cache already
+  set(LIBFT4222_FOUND TRUE)
+else (LIBFT4222_LIBRARIES AND LIBFT4222_INCLUDE_DIRS)
+  find_path(LIBFT4222_INCLUDE_DIR
+    NAMES
+    libft4222.h
+    PATHS
+    /usr/include
+    /usr/local/include
+    /opt/local/include
+    /sw/include
+	)
+
+  SET(FTD4222_LIBNAME ft4222)
+  IF(WIN32)
+	SET(FTD4222_LIBNAME LibFT4222.lib)
+  ENDIF(WIN32)
+
+  find_library(LIBFT4222_LIBRARY
+    NAMES
+    ${FTD4222_LIBNAME}
+    PATHS
+    /usr/lib
+    /usr/local/lib
+    /opt/local/lib
+    /sw/lib
+	)
+
+  if(LIBFT4222_INCLUDE_DIR)
+	set(LIBFT4222_INCLUDE_DIRS
+      ${LIBFT4222_INCLUDE_DIR}
+	  )
+  endif(LIBFT4222_INCLUDE_DIR)
+  set(LIBFT4222_LIBRARIES
+    ${LIBFT4222_LIBRARY}
+	)
+
+  if (LIBFT4222_INCLUDE_DIRS AND LIBFT4222_LIBRARIES)
+    set(LIBFT4222_FOUND TRUE)
+  endif (LIBFT4222_INCLUDE_DIRS AND LIBFT4222_LIBRARIES)
+
+  if (LIBFT4222_FOUND)
+    if (NOT LIBFT4222_FIND_QUIETLY)
+	  message(STATUS "Found LIBFT4222: ${LIBFT4222_LIBRARIES}")
+    endif (NOT LIBFT4222_FIND_QUIETLY)
+  else (LIBFT4222_FOUND)
+    if (LIBFT4222_FIND_REQUIRED)
+	  message(FATAL_ERROR "Could not find LIBFT4222")
+    endif (LIBFT4222_FIND_REQUIRED)
+  endif (LIBFT4222_FOUND)
+
+  # show the LIBFT4222_INCLUDE_DIRS and LIBFT4222_LIBRARIES variables only in the advanced view
+  mark_as_advanced(LIBFT4222_INCLUDE_DIRS LIBFT4222_LIBRARIES)
+
+endif (LIBFT4222_LIBRARIES AND LIBFT4222_INCLUDE_DIRS)
+