Import elksmart-comm for transceiving IR codes

The receive functionality in the EXK4S is quite unstable,
however useful enough for something that is officially unsupported.

The gadgets are picky about cables and/or ports,
but it has ridiculous reach when it works.

This utility has previously been in the desktop-tools repository.

CMakeLists.txt

@@ -0,0 +1,71 @@
+cmake_minimum_required (VERSION 3.10)
+project (usb-drivers VERSION 0.1.0 DESCRIPTION "USB drivers" LANGUAGES C)
+
+# Moar warnings
+set (CMAKE_C_STANDARD 99)
+set (CMAKE_C_STANDARD_REQUIRED ON)
+set (CMAKE_C_EXTENSIONS OFF)
+
+if ("${CMAKE_C_COMPILER_ID}" MATCHES "GNU" OR CMAKE_COMPILER_IS_GNUCC)
+	# -Wunused-function is pretty annoying here, as everything is static
+	set (CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall -Wextra -Wno-unused-function")
+endif ()
+
+# Dependencies
+set (CMAKE_MODULE_PATH ${PROJECT_SOURCE_DIR}/liberty/cmake)
+include (AddThreads)
+
+find_package (PkgConfig REQUIRED)
+pkg_check_modules (libusb libusb-1.0)
+
+option (WITH_LIBUSB "Compile with libusb utilities" ${libusb_FOUND})
+
+# Generate a configuration file
+configure_file (${PROJECT_SOURCE_DIR}/config.h.in
+	${PROJECT_BINARY_DIR}/config.h)
+include_directories (${PROJECT_BINARY_DIR})
+
+# Build
+if ("${CMAKE_SYSTEM_NAME}" MATCHES BSD)
+	# Need this for SIGWINCH in FreeBSD and OpenBSD respectively;
+	# our POSIX version macros make it undefined
+	add_definitions (-D__BSD_VISIBLE=1 -D_BSD_SOURCE=1)
+elseif (APPLE)
+	add_definitions (-D_DARWIN_C_SOURCE)
+endif ()
+
+if (WITH_LIBUSB)
+	list (APPEND targets elksmart-comm)
+	add_executable (elksmart-comm elksmart-comm.c)
+	target_include_directories (elksmart-comm PUBLIC ${libusb_INCLUDE_DIRS})
+	target_link_directories (elksmart-comm PUBLIC ${libusb_LIBRARY_DIRS})
+	target_link_libraries (elksmart-comm ${libusb_LIBRARIES})
+endif ()
+
+# The files to be installed
+include (GNUInstallDirs)
+
+# These should be accessible by users, but need to touch system devices.
+# Use the setuid bit, for simplicity.
+install (TARGETS ${targets} DESTINATION ${CMAKE_INSTALL_BINDIR}
+	PERMISSIONS
+		OWNER_WRITE OWNER_READ OWNER_EXECUTE
+		GROUP_READ GROUP_EXECUTE
+		WORLD_READ WORLD_EXECUTE
+		SETUID)
+install (FILES LICENSE DESTINATION ${CMAKE_INSTALL_DOCDIR})
+
+# CPack
+set (CPACK_PACKAGE_VENDOR "Premysl Eric Janouch")
+set (CPACK_PACKAGE_CONTACT "Přemysl Eric Janouch <p@janouch.name>")
+set (CPACK_RESOURCE_FILE_LICENSE "${PROJECT_SOURCE_DIR}/LICENSE")
+set (CPACK_GENERATOR "TGZ;ZIP")
+set (CPACK_PACKAGE_FILE_NAME
+	"${PROJECT_NAME}-${PROJECT_VERSION}-${CMAKE_SYSTEM_NAME}-${CMAKE_SYSTEM_PROCESSOR}")
+set (CPACK_PACKAGE_INSTALL_DIRECTORY "${PROJECT_NAME}-${PROJECT_VERSION}")
+set (CPACK_SOURCE_GENERATOR "TGZ;ZIP")
+set (CPACK_SOURCE_IGNORE_FILES "/\\\\.git;/build;/CMakeLists.txt.user")
+set (CPACK_SOURCE_PACKAGE_FILE_NAME "${PROJECT_NAME}-${PROJECT_VERSION}")
+
+set (CPACK_SET_DESTDIR TRUE)
+include (CPack)