void SDL_SYS_JoystickDetect()
{
#if SDL_USE_LIBUDEV
struct udev_device *dev = NULL;
const char *devnode = NULL;
const char *action = NULL;
const char *val = NULL;
while (HotplugUpdateAvailable()) {
dev = UDEV_udev_monitor_receive_device(udev_mon);
if (dev == NULL) {
break;
}
val = UDEV_udev_device_get_property_value(dev, "ID_INPUT_JOYSTICK");
if ((!val) || (SDL_strcmp(val, "1") != 0)) {
continue;
}
action = UDEV_udev_device_get_action(dev);
devnode = UDEV_udev_device_get_devnode(dev);
if (SDL_strcmp(action, "add") == 0) {
const int device_index = MaybeAddDevice(devnode);
if (device_index != -1) {
/* !!! FIXME: Move this to an SDL_PrivateJoyDeviceAdded() function? */
#if !SDL_EVENTS_DISABLED
SDL_Event event;
event.type = SDL_JOYDEVICEADDED;
if (SDL_GetEventState(event.type) == SDL_ENABLE) {
event.jdevice.which = device_index;
if ( (SDL_EventOK == NULL) ||
(*SDL_EventOK) (SDL_EventOKParam, &event) ) {
SDL_PushEvent(&event);
}
}
#endif // !SDL_EVENTS_DISABLED
}
} else if (SDL_strcmp(action, "remove") == 0) {
const int inst = MaybeRemoveDevice(devnode);
if (inst != -1) {
/* !!! FIXME: Move this to an SDL_PrivateJoyDeviceRemoved() function? */
#if !SDL_EVENTS_DISABLED
SDL_Event event;
event.type = SDL_JOYDEVICEREMOVED;
if (SDL_GetEventState(event.type) == SDL_ENABLE) {
event.jdevice.which = inst;
if ( (SDL_EventOK == NULL) ||
(*SDL_EventOK) (SDL_EventOKParam, &event) ) {
SDL_PushEvent(&event);
}
}
#endif // !SDL_EVENTS_DISABLED
}
}
UDEV_udev_device_unref(dev);
}
#endif
}
int
SDL_SYS_JoystickInit(void)
{
/* First see if the user specified one or more joysticks to use */
if (SDL_getenv("SDL_JOYSTICK_DEVICE") != NULL) {
char *envcopy, *envpath, *delim;
envcopy = SDL_strdup(SDL_getenv("SDL_JOYSTICK_DEVICE"));
envpath = envcopy;
while (envpath != NULL) {
delim = SDL_strchr(envpath, ':');
if (delim != NULL) {
*delim++ = '\0';
}
MaybeAddDevice(envpath);
envpath = delim;
}
SDL_free(envcopy);
}
SDL_InitSteamControllers(SteamControllerConnectedCallback,
SteamControllerDisconnectedCallback);
#if SDL_USE_LIBUDEV
return JoystickInitWithUdev();
#else
return JoystickInitWithoutUdev();
#endif
}
int
SDL_SYS_JoystickInit(void)
{
/* First see if the user specified one or more joysticks to use */
if (SDL_getenv("SDL_JOYSTICK_DEVICE") != NULL) {
char *envcopy, *envpath, *delim;
envcopy = SDL_strdup(SDL_getenv("SDL_JOYSTICK_DEVICE"));
envpath = envcopy;
while (envpath != NULL) {
delim = SDL_strchr(envpath, ':');
if (delim != NULL) {
*delim++ = '\0';
}
MaybeAddDevice(envpath);
envpath = delim;
}
SDL_free(envcopy);
}
#if SDL_USE_LIBUDEV
if (LoadUDEVLibrary() == 0) { /* okay if this fails, FOR NOW. */
return JoystickInitWithUdev();
}
#endif
return JoystickInitWithoutUdev();
}
void joystick_udev_callback(SDL_UDEV_deviceevent udev_type, SDL_UDEV_deviceclass udev_class, const char *devpath)
{
int instance;
if (devpath == NULL || udev_class != SDL_UDEV_DEVICE_JOYSTICK) {
return;
}
switch( udev_type )
{
case SDL_UDEV_DEVICEADDED:
instance = MaybeAddDevice(devpath);
if (instance != -1) {
/* !!! FIXME: Move this to an SDL_PrivateJoyDeviceAdded() function? */
#if !SDL_EVENTS_DISABLED
SDL_Event event;
event.type = SDL_JOYDEVICEADDED;
if (SDL_GetEventState(event.type) == SDL_ENABLE) {
event.jdevice.which = instance;
if ( (SDL_EventOK == NULL) ||
(*SDL_EventOK) (SDL_EventOKParam, &event) ) {
SDL_PushEvent(&event);
}
}
#endif /* !SDL_EVENTS_DISABLED */
}
break;
case SDL_UDEV_DEVICEREMOVED:
instance = MaybeRemoveDevice(devpath);
if (instance != -1) {
/* !!! FIXME: Move this to an SDL_PrivateJoyDeviceRemoved() function? */
#if !SDL_EVENTS_DISABLED
SDL_Event event;
event.type = SDL_JOYDEVICEREMOVED;
if (SDL_GetEventState(event.type) == SDL_ENABLE) {
event.jdevice.which = instance;
if ( (SDL_EventOK == NULL) ||
(*SDL_EventOK) (SDL_EventOKParam, &event) ) {
SDL_PushEvent(&event);
}
}
#endif /* !SDL_EVENTS_DISABLED */
}
break;
default:
break;
}
}
static int
JoystickInitWithoutUdev(void)
{
int i;
char path[PATH_MAX];
/* !!! FIXME: only finds sticks if they're called /dev/input/event[0..31] */
/* !!! FIXME: we could at least readdir() through /dev/input...? */
/* !!! FIXME: (or delete this and rely on libudev?) */
for (i = 0; i < 32; i++) {
SDL_snprintf(path, SDL_arraysize(path), "/dev/input/event%d", i);
MaybeAddDevice(path);
}
return numjoysticks;
}
static int
JoystickInitWithUdev(void)
{
struct udev_enumerate *enumerate = NULL;
struct udev_list_entry *devs = NULL;
struct udev_list_entry *item = NULL;
SDL_assert(udev == NULL);
udev = UDEV_udev_new();
if (udev == NULL) {
SDL_SetError("udev_new() failed");
return -1;
}
udev_mon = UDEV_udev_monitor_new_from_netlink(udev, "udev");
if (udev_mon != NULL) { /* okay if it's NULL, we just lose hotplugging. */
UDEV_udev_monitor_filter_add_match_subsystem_devtype(udev_mon,
"input", NULL);
UDEV_udev_monitor_enable_receiving(udev_mon);
}
enumerate = UDEV_udev_enumerate_new(udev);
if (enumerate == NULL) {
SDL_SetError("udev_enumerate_new() failed");
return -1;
}
UDEV_udev_enumerate_add_match_subsystem(enumerate, "input");
UDEV_udev_enumerate_add_match_property(enumerate, "ID_INPUT_JOYSTICK", "1");
UDEV_udev_enumerate_scan_devices(enumerate);
devs = UDEV_udev_enumerate_get_list_entry(enumerate);
for (item = devs; item; item = UDEV_udev_list_entry_get_next(item)) {
const char *path = UDEV_udev_list_entry_get_name(item);
struct udev_device *dev = UDEV_udev_device_new_from_syspath(udev, path);
MaybeAddDevice(UDEV_udev_device_get_devnode(dev));
UDEV_udev_device_unref(dev);
}
UDEV_udev_enumerate_unref(enumerate);
return numjoysticks;
}
void joystick_udev_callback(SDL_UDEV_deviceevent udev_type, int udev_class, const char *devpath)
{
if (devpath == NULL || !(udev_class & SDL_UDEV_DEVICE_JOYSTICK)) {
return;
}
switch( udev_type )
{
case SDL_UDEV_DEVICEADDED:
MaybeAddDevice(devpath);
break;
case SDL_UDEV_DEVICEREMOVED:
MaybeRemoveDevice(devpath);
break;
default:
break;
}
}
