/* Function to scan the system for joysticks.
* Joystick 0 should be the system default joystick.
* This function should return the number of available joysticks, or -1
* on an unrecoverable fatal error.
*/
int
SDL_SYS_JoystickInit(void)
{
if (gpDeviceList) {
return SDL_SetError("Joystick: Device list already inited.");
}
if (!CreateHIDManager()) {
return SDL_SetError("Joystick: Couldn't initialize HID Manager");
}
return SDL_SYS_NumJoysticks();
}
/*
* Count the number of joysticks attached to the system
*/
int
SDL_NumJoysticks(void)
{
return SDL_SYS_NumJoysticks();
}
/* Function to scan the system for joysticks.
* Joystick 0 should be the system default joystick.
* This function should return the number of available joysticks, or -1
* on an unrecoverable fatal error.
*/
int
SDL_SYS_JoystickInit(void)
{
IOReturn result = kIOReturnSuccess;
mach_port_t masterPort = 0;
io_iterator_t hidObjectIterator = 0;
CFMutableDictionaryRef hidMatchDictionary = NULL;
io_object_t ioHIDDeviceObject = 0;
io_iterator_t portIterator = 0;
if (gpDeviceList) {
SDL_SetError("Joystick: Device list already inited.");
return -1;
}
result = IOMasterPort(bootstrap_port, &masterPort);
if (kIOReturnSuccess != result) {
SDL_SetError("Joystick: IOMasterPort error with bootstrap_port.");
return -1;
}
/* Set up a matching dictionary to search I/O Registry by class name for all HID class devices. */
hidMatchDictionary = IOServiceMatching(kIOHIDDeviceKey);
if (hidMatchDictionary) {
/* Add key for device type (joystick, in this case) to refine the matching dictionary. */
/* NOTE: we now perform this filtering later
UInt32 usagePage = kHIDPage_GenericDesktop;
UInt32 usage = kHIDUsage_GD_Joystick;
CFNumberRef refUsage = NULL, refUsagePage = NULL;
refUsage = CFNumberCreate (kCFAllocatorDefault, kCFNumberIntType, &usage);
CFDictionarySetValue (hidMatchDictionary, CFSTR (kIOHIDPrimaryUsageKey), refUsage);
refUsagePage = CFNumberCreate (kCFAllocatorDefault, kCFNumberIntType, &usagePage);
CFDictionarySetValue (hidMatchDictionary, CFSTR (kIOHIDPrimaryUsagePageKey), refUsagePage);
*/
} else {
SDL_SetError
("Joystick: Failed to get HID CFMutableDictionaryRef via IOServiceMatching.");
return -1;
}
/*/ Now search I/O Registry for matching devices. */
result =
IOServiceGetMatchingServices(masterPort, hidMatchDictionary,
&hidObjectIterator);
/* Check for errors */
if (kIOReturnSuccess != result) {
SDL_SetError("Joystick: Couldn't create a HID object iterator.");
return -1;
}
if (!hidObjectIterator) { /* there are no joysticks */
gpDeviceList = NULL;
return 0;
}
/* IOServiceGetMatchingServices consumes a reference to the dictionary, so we don't need to release the dictionary ref. */
/* build flat linked list of devices from device iterator */
gpDeviceList = NULL;
while ((ioHIDDeviceObject = IOIteratorNext(hidObjectIterator))) {
AddDeviceHelper( ioHIDDeviceObject );
}
result = IOObjectRelease(hidObjectIterator); /* release the iterator */
/* now connect notification for new devices */
notificationPort = IONotificationPortCreate(masterPort);
hidMatchDictionary = IOServiceMatching(kIOHIDDeviceKey);
CFRunLoopAddSource(CFRunLoopGetCurrent(),
IONotificationPortGetRunLoopSource(notificationPort),
kCFRunLoopDefaultMode);
// Register for notifications when a serial port is added to the system
result = IOServiceAddMatchingNotification(notificationPort,
kIOFirstMatchNotification,
hidMatchDictionary,
JoystickDeviceWasAddedCallback,
NULL,
&portIterator);
while (IOIteratorNext(portIterator)) {}; // Run out the iterator or notifications won't start (you can also use it to iterate the available devices).
return SDL_SYS_NumJoysticks();
}