// creates a queue for a device, creates and opens device interface if required
static IOReturn HIDCreateQueue( IOHIDDeviceRef inIOHIDDeviceRef )
{
IOReturn result = kIOReturnSuccess;
if ( inIOHIDDeviceRef ) {
assert( IOHIDDeviceGetTypeID() == CFGetTypeID( inIOHIDDeviceRef ) );
// do we already have a queue?
IOHIDQueueRef tIOHIDQueueRef = IOHIDDevice_GetQueue( inIOHIDDeviceRef );
if ( tIOHIDQueueRef ) { // (yes)
assert( IOHIDQueueGetTypeID() == CFGetTypeID( tIOHIDQueueRef ) );
} else {
tIOHIDQueueRef = IOHIDQueueCreate( kCFAllocatorDefault, inIOHIDDeviceRef, kDeviceQueueSize, kIOHIDOptionsTypeNone );
if ( tIOHIDQueueRef ) { // did that work
HIDReportErrorNum( "Failed to create queue via create", result );
} else {
result = kIOReturnSuccess;
}
}
} else {
HIDReportErrorNum( "HID device ref does not exist for queue creation", result );
}
return result;
} /* HIDCreateQueue */
IOHIDQueueRef IOHIDDevice_GetQueue(IOHIDDeviceRef inIOHIDDeviceRef) {
IOHIDQueueRef result = 0;
(void) IOHIDDevice_GetPtrProperty(inIOHIDDeviceRef, CFSTR(kIOHIDDevice_QueueKey), (void *) &result);
if ( result ) {
assert( IOHIDQueueGetTypeID() == CFGetTypeID(result) );
}
return (result);
} // IOHIDDevice_GetQueue
