4 files changed, 240 insertions, 0 deletions

diff --git a/.gitmodules b/.gitmodules
index 6fa823c1c..9d9356151 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -16,6 +16,9 @@
 [submodule "libressl"]
     path = externals/libressl
     url = https://github.com/citra-emu/ext-libressl-portable.git
+[submodule "libusb"]
+        path = externals/libusb/libusb
+        url = https://github.com/libusb/libusb.git
 [submodule "discord-rpc"]
     path = externals/discord-rpc
     url = https://github.com/discordapp/discord-rpc.git
diff --git a/externals/libusb/CMakeLists.txt b/externals/libusb/CMakeLists.txt
new file mode 100644
index 000000000..074ce01d3
--- /dev/null
+++ b/externals/libusb/CMakeLists.txt
@@ -0,0 +1,147 @@
+add_library(usb STATIC EXCLUDE_FROM_ALL
+    libusb/libusb/core.c
+    libusb/libusb/core.c
+    libusb/libusb/descriptor.c
+    libusb/libusb/hotplug.c
+    libusb/libusb/io.c
+    libusb/libusb/strerror.c
+    libusb/libusb/sync.c
+)
+set_target_properties(usb PROPERTIES VERSION 1.0.23)
+if(WIN32)
+    target_include_directories(usb
+        BEFORE
+        PUBLIC
+          libusb/libusb
+
+        PRIVATE
+          "${CMAKE_CURRENT_BINARY_DIR}"
+    )
+
+    if (NOT MINGW)
+        target_include_directories(usb BEFORE PRIVATE libusb/msvc)
+    endif()
+else()
+target_include_directories(usb
+    # turns out other projects also have "config.h", so make sure the
+    # LibUSB one comes first
+    BEFORE
+
+    PUBLIC
+      libusb/libusb
+
+    PRIVATE
+      "${CMAKE_CURRENT_BINARY_DIR}"
+)
+endif()
+
+if(WIN32 OR CYGWIN)
+    target_sources(usb PRIVATE
+      libusb/libusb/os/threads_windows.c
+      libusb/libusb/os/windows_winusb.c
+      libusb/libusb/os/windows_usbdk.c
+      libusb/libusb/os/windows_nt_common.c
+    )
+    set(OS_WINDOWS TRUE)
+elseif(APPLE)
+    target_sources(usb PRIVATE
+        libusb/libusb/os/darwin_usb.c
+    )
+    find_library(COREFOUNDATION_LIBRARY CoreFoundation)
+    find_library(IOKIT_LIBRARY IOKit)
+    find_library(OBJC_LIBRARY objc)
+    target_link_libraries(usb PRIVATE
+        ${COREFOUNDATION_LIBRARY}
+        ${IOKIT_LIBRARY}
+        ${OBJC_LIBRARY}
+    )
+    set(OS_DARWIN TRUE)
+elseif(ANDROID)
+    target_sources(usb PRIVATE
+        libusb/libusb/os/linux_usbfs.c
+        libusb/libusb/os/linux_netlink.c
+    )
+    find_library(LOG_LIBRARY log)
+    target_link_libraries(usb PRIVATE ${LOG_LIBRARY})
+    set(OS_LINUX TRUE)
+elseif(${CMAKE_SYSTEM_NAME} MATCHES "Linux")
+    target_sources(usb PRIVATE
+        libusb/libusb/os/linux_usbfs.c
+    )
+    find_package(Libudev)
+    if(LIBUDEV_FOUND)
+        target_sources(usb PRIVATE
+            libusb/libusb/os/linux_udev.c
+        )
+        target_link_libraries(usb PRIVATE "${LIBUDEV_LIBRARIES}")
+        target_include_directories(usb PRIVATE "${LIBUDEV_INCLUDE_DIR}")
+        set(HAVE_LIBUDEV TRUE)
+        set(USE_UDEV TRUE)
+    else()
+        target_sources(usb PRIVATE
+            libusb/libusb/os/linux_netlink.c
+        )
+    endif()
+    set(OS_LINUX TRUE)
+elseif(${CMAKE_SYSTEM_NAME} MATCHES "NetBSD")
+    target_sources(usb PRIVATE
+        libusb/libusb/os/netbsd_usb.c
+    )
+    set(OS_NETBSD TRUE)
+elseif(${CMAKE_SYSTEM_NAME} MATCHES "OpenBSD")
+    target_sources(usb PRIVATE
+        libusb/libusb/os/openbsd_usb.c
+    )
+    set(OS_OPENBSD TRUE)
+endif()
+
+if(UNIX)
+    target_sources(usb PRIVATE
+        libusb/libusb/os/poll_posix.c
+        libusb/libusb/os/threads_posix.c
+    )
+    find_package(Threads REQUIRED)
+    if(THREADS_HAVE_PTHREAD_ARG)
+      target_compile_options(usb PUBLIC "-pthread")
+    endif()
+    if(CMAKE_THREAD_LIBS_INIT)
+      target_link_libraries(usb PRIVATE "${CMAKE_THREAD_LIBS_INIT}")
+    endif()
+    set(THREADS_POSIX TRUE)
+elseif(WIN32)
+    target_sources(usb PRIVATE
+        libusb/libusb/os/poll_windows.c
+        libusb/libusb/os/threads_windows.c
+    )
+endif()
+
+include(CheckFunctionExists)
+include(CheckIncludeFiles)
+include(CheckTypeSize)
+check_include_files(asm/types.h HAVE_ASM_TYPES_H)
+check_function_exists(gettimeofday HAVE_GETTIMEOFDAY)
+check_include_files(linux/filter.h HAVE_LINUX_FILTER_H)
+check_include_files(linux/netlink.h HAVE_LINUX_NETLINK_H)
+check_include_files(poll.h HAVE_POLL_H)
+check_include_files(signal.h HAVE_SIGNAL_H)
+check_include_files(strings.h HAVE_STRINGS_H)
+check_type_size("struct timespec" STRUCT_TIMESPEC)
+check_function_exists(syslog HAVE_SYSLOG_FUNC)
+check_include_files(syslog.h HAVE_SYSLOG_H)
+check_include_files(sys/socket.h HAVE_SYS_SOCKET_H)
+check_include_files(sys/time.h HAVE_SYS_TIME_H)
+check_include_files(sys/types.h HAVE_SYS_TYPES_H)
+
+set(CMAKE_EXTRA_INCLUDE_FILES poll.h)
+check_type_size("nfds_t" nfds_t)
+unset(CMAKE_EXTRA_INCLUDE_FILES)
+if(HAVE_NFDS_T)
+    set(POLL_NFDS_TYPE "nfds_t")
+else()
+    set(POLL_NFDS_TYPE "unsigned int")
+endif()
+
+check_include_files(sys/timerfd.h USBI_TIMERFD_AVAILABLE)
+
+
+configure_file(config.h.in config.h)
diff --git a/externals/libusb/config.h.in b/externals/libusb/config.h.in
new file mode 100644
index 000000000..915b7390f
--- /dev/null
+++ b/externals/libusb/config.h.in
@@ -0,0 +1,90 @@
+/* Default visibility */
+#if defined(__GNUC__) || defined(__clang__)
+  #define DEFAULT_VISIBILITY __attribute__((visibility("default")))
+#elif defined(_MSC_VER)
+  #define DEFAULT_VISIBILITY __declspec(dllexport)
+#endif
+
+/* Start with debug message logging enabled */
+#undef ENABLE_DEBUG_LOGGING
+
+/* Message logging */
+#undef ENABLE_LOGGING
+
+/* Define to 1 if you have the <asm/types.h> header file. */
+#cmakedefine HAVE_ASM_TYPES_H 1
+
+/* Define to 1 if you have the `gettimeofday' function. */
+#cmakedefine HAVE_GETTIMEOFDAY 1
+
+/* Define to 1 if you have the `udev' library (-ludev). */
+#cmakedefine HAVE_LIBUDEV 1
+
+/* Define to 1 if you have the <linux/filter.h> header file. */
+#cmakedefine HAVE_LINUX_FILTER_H 1
+
+/* Define to 1 if you have the <linux/netlink.h> header file. */
+#cmakedefine HAVE_LINUX_NETLINK_H 1
+
+/* Define to 1 if you have the <poll.h> header file. */
+#cmakedefine HAVE_POLL_H 1
+
+/* Define to 1 if you have the <signal.h> header file. */
+#cmakedefine HAVE_SIGNAL_H 1
+
+/* Define to 1 if you have the <strings.h> header file. */
+#cmakedefine HAVE_STRINGS_H 1
+
+/* Define to 1 if the system has the type `struct timespec'. */
+#cmakedefine HAVE_STRUCT_TIMESPEC 1
+
+/* syslog() function available */
+#cmakedefine HAVE_SYSLOG_FUNC 1
+
+/* Define to 1 if you have the <syslog.h> header file. */
+#cmakedefine HAVE_SYSLOG_H 1
+
+/* Define to 1 if you have the <sys/socket.h> header file. */
+#cmakedefine HAVE_SYS_SOCKET_H 1
+
+/* Define to 1 if you have the <sys/time.h> header file. */
+#cmakedefine HAVE_SYS_TIME_H 1
+
+/* Define to 1 if you have the <sys/types.h> header file. */
+#cmakedefine HAVE_SYS_TYPES_H 1
+
+/* Darwin backend */
+#cmakedefine OS_DARWIN 1
+
+/* Linux backend */
+#cmakedefine OS_LINUX 1
+
+/* NetBSD backend */
+#cmakedefine OS_NETBSD 1
+
+/* OpenBSD backend */
+#cmakedefine OS_OPENBSD 1
+
+/* Windows backend */
+#cmakedefine OS_WINDOWS 1
+
+/* type of second poll() argument */
+#define POLL_NFDS_TYPE @POLL_NFDS_TYPE@
+
+/* Use POSIX Threads */
+#cmakedefine THREADS_POSIX
+
+/* timerfd headers available */
+#cmakedefine USBI_TIMERFD_AVAILABLE 1
+
+/* Enable output to system log */
+#define USE_SYSTEM_LOGGING_FACILITY 1
+
+/* Use udev for device enumeration/hotplug */
+#cmakedefine USE_UDEV 1
+
+/* Use GNU extensions */
+#define _GNU_SOURCE
+
+/* Oldest Windows version supported */
+#define WINVER 0x0501
diff --git a/externals/libusb/libusb b/externals/libusb/libusb
new file mode 160000
+Subproject e782eeb2514266f6738e242cdcb18e3ae1ed06f