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hidapi: Allow disabling libusb support at runtime

This commit is contained in:
Ethan Lee 2022-05-30 16:17:04 -04:00 committed by Sam Lantinga
parent c87b0142fe
commit 964e979d06
1 changed files with 53 additions and 47 deletions
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100
src/hidapi/SDL_hidapi.c
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@ -1037,54 +1037,60 @@ int SDL_hid_init(void)
#endif
#ifdef SDL_LIBUSB_DYNAMIC
++attempts;
libusb_ctx.libhandle = SDL_LoadObject(SDL_LIBUSB_DYNAMIC);
if (libusb_ctx.libhandle != NULL) {
SDL_bool loaded = SDL_TRUE;
#ifdef __OS2__
#define LOAD_LIBUSB_SYMBOL(func) \
if (!(libusb_ctx.func = SDL_LoadFunction(libusb_ctx.libhandle,"_libusb_" #func))) {loaded = SDL_FALSE;}
#else
#define LOAD_LIBUSB_SYMBOL(func) \
if (!(libusb_ctx.func = SDL_LoadFunction(libusb_ctx.libhandle, "libusb_" #func))) {loaded = SDL_FALSE;}
#endif
LOAD_LIBUSB_SYMBOL(init)
LOAD_LIBUSB_SYMBOL(exit)
LOAD_LIBUSB_SYMBOL(get_device_list)
LOAD_LIBUSB_SYMBOL(free_device_list)
LOAD_LIBUSB_SYMBOL(get_device_descriptor)
LOAD_LIBUSB_SYMBOL(get_active_config_descriptor)
LOAD_LIBUSB_SYMBOL(get_config_descriptor)
LOAD_LIBUSB_SYMBOL(free_config_descriptor)
LOAD_LIBUSB_SYMBOL(get_bus_number)
LOAD_LIBUSB_SYMBOL(get_device_address)
LOAD_LIBUSB_SYMBOL(open)
LOAD_LIBUSB_SYMBOL(close)
LOAD_LIBUSB_SYMBOL(claim_interface)
LOAD_LIBUSB_SYMBOL(release_interface)
LOAD_LIBUSB_SYMBOL(kernel_driver_active)
LOAD_LIBUSB_SYMBOL(detach_kernel_driver)
LOAD_LIBUSB_SYMBOL(attach_kernel_driver)
LOAD_LIBUSB_SYMBOL(set_interface_alt_setting)
LOAD_LIBUSB_SYMBOL(alloc_transfer)
LOAD_LIBUSB_SYMBOL(submit_transfer)
LOAD_LIBUSB_SYMBOL(cancel_transfer)
LOAD_LIBUSB_SYMBOL(free_transfer)
LOAD_LIBUSB_SYMBOL(control_transfer)
LOAD_LIBUSB_SYMBOL(interrupt_transfer)
LOAD_LIBUSB_SYMBOL(handle_events)
LOAD_LIBUSB_SYMBOL(handle_events_completed)
#undef LOAD_LIBUSB_SYMBOL
if (SDL_getenv("SDL_HIDAPI_DISABLE_LIBUSB") != NULL) {
SDL_LogDebug(SDL_LOG_CATEGORY_INPUT,
"libusb disabled by SDL_HIDAPI_DISABLE_LIBUSB");
libusb_ctx.libhandle = NULL;
} else {
++attempts;
libusb_ctx.libhandle = SDL_LoadObject(SDL_LIBUSB_DYNAMIC);
if (libusb_ctx.libhandle != NULL) {
SDL_bool loaded = SDL_TRUE;
#ifdef __OS2__
#define LOAD_LIBUSB_SYMBOL(func) \
if (!(libusb_ctx.func = SDL_LoadFunction(libusb_ctx.libhandle,"_libusb_" #func))) {loaded = SDL_FALSE;}
#else
#define LOAD_LIBUSB_SYMBOL(func) \
if (!(libusb_ctx.func = SDL_LoadFunction(libusb_ctx.libhandle, "libusb_" #func))) {loaded = SDL_FALSE;}
#endif
LOAD_LIBUSB_SYMBOL(init)
LOAD_LIBUSB_SYMBOL(exit)
LOAD_LIBUSB_SYMBOL(get_device_list)
LOAD_LIBUSB_SYMBOL(free_device_list)
LOAD_LIBUSB_SYMBOL(get_device_descriptor)
LOAD_LIBUSB_SYMBOL(get_active_config_descriptor)
LOAD_LIBUSB_SYMBOL(get_config_descriptor)
LOAD_LIBUSB_SYMBOL(free_config_descriptor)
LOAD_LIBUSB_SYMBOL(get_bus_number)
LOAD_LIBUSB_SYMBOL(get_device_address)
LOAD_LIBUSB_SYMBOL(open)
LOAD_LIBUSB_SYMBOL(close)
LOAD_LIBUSB_SYMBOL(claim_interface)
LOAD_LIBUSB_SYMBOL(release_interface)
LOAD_LIBUSB_SYMBOL(kernel_driver_active)
LOAD_LIBUSB_SYMBOL(detach_kernel_driver)
LOAD_LIBUSB_SYMBOL(attach_kernel_driver)
LOAD_LIBUSB_SYMBOL(set_interface_alt_setting)
LOAD_LIBUSB_SYMBOL(alloc_transfer)
LOAD_LIBUSB_SYMBOL(submit_transfer)
LOAD_LIBUSB_SYMBOL(cancel_transfer)
LOAD_LIBUSB_SYMBOL(free_transfer)
LOAD_LIBUSB_SYMBOL(control_transfer)
LOAD_LIBUSB_SYMBOL(interrupt_transfer)
LOAD_LIBUSB_SYMBOL(handle_events)
LOAD_LIBUSB_SYMBOL(handle_events_completed)
#undef LOAD_LIBUSB_SYMBOL
if (!loaded) {
SDL_UnloadObject(libusb_ctx.libhandle);
libusb_ctx.libhandle = NULL;
/* SDL_LogWarn(SDL_LOG_CATEGORY_INPUT, SDL_LIBUSB_DYNAMIC " found but could not load function"); */
} else if (LIBUSB_hid_init() < 0) {
SDL_UnloadObject(libusb_ctx.libhandle);
libusb_ctx.libhandle = NULL;
} else {
++success;
if (!loaded) {
SDL_UnloadObject(libusb_ctx.libhandle);
libusb_ctx.libhandle = NULL;
/* SDL_LogWarn(SDL_LOG_CATEGORY_INPUT, SDL_LIBUSB_DYNAMIC " found but could not load function"); */
} else if (LIBUSB_hid_init() < 0) {
SDL_UnloadObject(libusb_ctx.libhandle);
libusb_ctx.libhandle = NULL;
} else {
++success;
}
}
}
#endif /* SDL_LIBUSB_DYNAMIC */