Build changes for the use of CM108 for PTT on Mac

The CMake changes are slightly complicated by the Windows build using
a local copy of some hidapi files, for some reason, instead of using
the hidapi library itself. The Mac version uses hidapi in the same way
as other libraries.

In the CMake files, it is unclear to me whether "elseif (NOT WIN32 AND
NOT CYGWIN)" means the same thing as "elseif (APPLE)", so they are
treated separately in order to avoid breaking other build types.

CMakeLists.txt

@@ -342,6 +342,17 @@ elseif (HAVE_SNDIO)
     set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -DUSE_SNDIO")
   endif()
 
+elseif (APPLE)
+  find_package(Portaudio REQUIRED)
+  if(PORTAUDIO_FOUND)
+    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -DUSE_PORTAUDIO")
+  endif()
+
+  find_package(hidapi REQUIRED)
+  if(HIDAPI_FOUND)
+    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -DUSE_CM108")
+  endif()
+
 elseif (NOT WIN32 AND NOT CYGWIN)
   find_package(Portaudio REQUIRED)
   if(PORTAUDIO_FOUND)
@@ -367,7 +378,10 @@ add_subdirectory(data)
 # external libraries
 add_subdirectory(${CUSTOM_GEOTRANZ_DIR})
 add_subdirectory(${CUSTOM_REGEX_DIR})
-add_subdirectory(${CUSTOM_HIDAPI_DIR})
+if(NOT APPLE)
+  # Mac builds use the hidapi library, not custom local files
+  add_subdirectory(${CUSTOM_HIDAPI_DIR})
+endif()
 add_subdirectory(${CUSTOM_MISC_DIR})
 
 # direwolf source code and utilities

cmake/modules/Findhidapi.cmake

@@ -0,0 +1,44 @@
+# - Try to find hidapi
+#
+#  HIDAPI_FOUND - system has hidapi
+#  HIDAPI_LIBRARIES - location of the library for hidapi
+#  HIDAPI_INCLUDE_DIRS - location of the include files for hidapi
+
+set(HIDAPI_ROOT_DIR
+  "${HIDAPI_ROOT_DIR}"
+  CACHE
+  PATH
+  "Directory to search for hidapi")
+
+# no need to check pkg-config
+
+find_path(HIDAPI_INCLUDE_DIRS
+  NAMES
+  hidapi.h
+  PATHS
+  /usr/local/include
+  /usr/include
+  /opt/local/include
+  HINTS
+  ${HIDAPI_ROOT_DIR}
+  PATH_SUFFIXES
+  hidapi
+  )
+
+find_library(HIDAPI_LIBRARIES
+  NAMES
+  hidapi
+  PATHS
+  /usr/local/lib
+  /usr/lib
+  /usr/lib64
+  /opt/local/lib
+  HINTS
+  ${HIDAPI_ROOT_DIR}
+  )
+
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(HIDAPI DEFAULT_MSG HIDAPI_INCLUDE_DIRS HIDAPI_LIBRARIES)
+
+mark_as_advanced(HIDAPI_INCLUDE_DIRS HIDAPI_LIBRARIES)

src/CMakeLists.txt

@@ -10,15 +10,21 @@ include_directories(
   ${PORTAUDIO_INCLUDE_DIRS}
   ${SNDIO_INCLUDE_DIRS}
   ${CUSTOM_GEOTRANZ_DIR}
-  ${CUSTOM_HIDAPI_DIR}
   )
 
 if(WIN32 OR CYGWIN)
   include_directories(
+    ${CUSTOM_HIDAPI_DIR}
     ${CUSTOM_REGEX_DIR}
   )
 endif()
 
+if(APPLE)
+  include_directories(
+    ${HIDAPI_INCLUDE_DIRS}
+  )
+endif()
+
 
 # direwolf
 list(APPEND direwolf_SOURCES
@@ -131,6 +137,7 @@ if(LINUX)
   else() # macOS freebsd
     list(APPEND direwolf_SOURCES
       audio_portaudio.c
+      cm108.c
       )
     if(USE_MACOS_DNSSD)
       list(APPEND direwolf_SOURCES
@@ -469,10 +476,11 @@ endif()
 
 # List USB audio adapters than can use GPIO for PTT.
 # Originally for Linux only (using udev).
-# Version 1.7 adds it for Windows.  Needs hidapi library.
+# Version 1.7 adds it for Windows.  Uses local hidapi code.
+# Post-1.7 adds it for Mac. Uses hidapi library.
 
 # cm108
-if(UDEV_FOUND OR WIN32 OR CYGWIN)
+if(UDEV_FOUND OR WIN32 OR CYGWIN OR HIDAPI_FOUND)
   list(APPEND cm108_SOURCES
     cm108.c
     textcolor.c
@@ -496,6 +504,12 @@ if(UDEV_FOUND OR WIN32 OR CYGWIN)
       )
   endif()
 
+  if (APPLE)
+    target_link_libraries(cm108
+      ${HIDAPI_LIBRARIES}
+      )
+  endif()
+
   if (WIN32 OR CYGWIN)
     target_link_libraries(cm108
       ${HIDAPI_LIBRARIES}
@@ -568,6 +582,6 @@ install(TARGETS ttcalc DESTINATION ${INSTALL_BIN_DIR})
 install(TARGETS kissutil DESTINATION ${INSTALL_BIN_DIR})
 install(TARGETS tnctest DESTINATION ${INSTALL_BIN_DIR})
 install(TARGETS appserver DESTINATION ${INSTALL_BIN_DIR})
-if(UDEV_FOUND OR WIN32 OR CYGWIN)
+if(UDEV_FOUND OR WIN32 OR CYGWIN OR HIDAPI_FOUND)
   install(TARGETS cm108 DESTINATION ${INSTALL_BIN_DIR})
 endif()