/
SDL_sysjoystick.c
838 lines (727 loc) · 26.8 KB
1
2
/*
SDL - Simple DirectMedia Layer
3
Copyright (C) 1997-2004 Sam Lantinga
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Sam Lantinga
20
slouken@libsdl.org
21
*/
22
#include "SDL_config.h"
23
24
/* SDL joystick driver for Darwin / MacOS X, based on the IOKit HID API */
25
26
27
28
29
30
31
32
33
/* Written 2001 by Max Horn */
#include <unistd.h>
#include <ctype.h>
#include <sysexits.h>
#include <mach/mach.h>
#include <mach/mach_error.h>
#include <IOKit/IOKitLib.h>
#include <IOKit/IOCFPlugIn.h>
34
35
36
37
#ifdef MACOS_10_0_4
#include <IOKit/hidsystem/IOHIDUsageTables.h>
#else
/* The header was moved here in MacOS X 10.1 */
38
#include <Kernel/IOKit/hidsystem/IOHIDUsageTables.h>
39
#endif
40
41
42
#include <IOKit/hid/IOHIDLib.h>
#include <IOKit/hid/IOHIDKeys.h>
#include <CoreFoundation/CoreFoundation.h>
43
#include <Carbon/Carbon.h> /* for NewPtrClear, DisposePtr */
44
45
#include "SDL_joystick.h"
46
47
#include "../SDL_sysjoystick.h"
#include "../SDL_joystick_c.h"
48
49
50
struct recElement
{
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
IOHIDElementCookie cookie; /* unique value which identifies element, will NOT change */
long min; /* reported min value possible */
long max; /* reported max value possible */
#if 0
/* TODO: maybe should handle the following stuff somehow? */
long scaledMin; /* reported scaled min value possible */
long scaledMax; /* reported scaled max value possible */
long size; /* size in bits of data return from element */
Boolean relative; /* are reports relative to last report (deltas) */
Boolean wrapping; /* does element wrap around (one value higher than max is min) */
Boolean nonLinear; /* are the values reported non-linear relative to element movement */
Boolean preferredState; /* does element have a preferred state (such as a button) */
Boolean nullState; /* does element have null state */
#endif /* 0 */
66
67
/* runtime variables used for auto-calibration */
68
69
long minReport; /* min returned value */
long maxReport; /* max returned value */
70
71
struct recElement * pNext; /* next element in list */
72
73
74
75
76
};
typedef struct recElement recElement;
struct joystick_hwdata
{
77
IOHIDDeviceInterface ** interface; /* interface to device, NULL = no interface */
78
79
80
81
char product[256]; /* name of product */
long usage; /* usage page from IOUSBHID Parser.h which defines general usage */
long usagePage; /* usage within above page from IOUSBHID Parser.h which defines specific usage */
82
83
84
85
86
long axes; /* number of axis (calculated, not reported by device) */
long buttons; /* number of buttons (calculated, not reported by device) */
long hats; /* number of hat switches (calculated, not reported by device) */
long elements; /* number of total elements (shouldbe total of above) (calculated, not reported by device) */
87
88
89
90
91
recElement* firstAxis;
recElement* firstButton;
recElement* firstHat;
92
93
94
int removed;
int uncentered;
95
struct joystick_hwdata* pNext; /* next device */
96
97
98
99
100
101
102
103
};
typedef struct joystick_hwdata recDevice;
/* Linked list of all available devices */
static recDevice *gpDeviceList = NULL;
104
static void HIDReportErrorNum (char * strError, long numError)
105
106
107
108
109
110
111
112
113
114
{
SDL_SetError(strError);
}
static void HIDGetCollectionElements (CFMutableDictionaryRef deviceProperties, recDevice *pDevice);
/* returns current value for element, polling element
* will return 0 on error conditions which should be accounted for by application
*/
115
static SInt32 HIDGetElementValue (recDevice *pDevice, recElement *pElement)
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
{
IOReturn result = kIOReturnSuccess;
IOHIDEventStruct hidEvent;
hidEvent.value = 0;
if (NULL != pDevice && NULL != pElement && NULL != pDevice->interface)
{
result = (*(pDevice->interface))->getElementValue(pDevice->interface, pElement->cookie, &hidEvent);
if (kIOReturnSuccess == result)
{
/* record min and max for auto calibration */
if (hidEvent.value < pElement->minReport)
pElement->minReport = hidEvent.value;
if (hidEvent.value > pElement->maxReport)
pElement->maxReport = hidEvent.value;
}
}
134
/* auto user scale */
135
136
137
return hidEvent.value;
}
138
static SInt32 HIDScaledCalibratedValue (recDevice *pDevice, recElement *pElement, long min, long max)
139
140
141
142
143
{
float deviceScale = max - min;
float readScale = pElement->maxReport - pElement->minReport;
SInt32 value = HIDGetElementValue(pDevice, pElement);
if (readScale == 0)
144
return value; /* no scaling at all */
145
146
147
148
else
return ((value - pElement->minReport) * deviceScale / readScale) + min;
}
149
150
151
152
153
154
155
156
157
158
159
160
161
static void HIDRemovalCallback(void * target,
IOReturn result,
void * refcon,
void * sender)
{
recDevice *device = (recDevice *) refcon;
device->removed = 1;
device->uncentered = 1;
}
162
163
164
165
/* Create and open an interface to device, required prior to extracting values or building queues.
* Note: appliction now owns the device and must close and release it prior to exiting
*/
166
static IOReturn HIDCreateOpenDeviceInterface (io_object_t hidDevice, recDevice *pDevice)
167
168
169
170
171
172
173
174
175
176
177
178
{
IOReturn result = kIOReturnSuccess;
HRESULT plugInResult = S_OK;
SInt32 score = 0;
IOCFPlugInInterface ** ppPlugInInterface = NULL;
if (NULL == pDevice->interface)
{
result = IOCreatePlugInInterfaceForService (hidDevice, kIOHIDDeviceUserClientTypeID,
kIOCFPlugInInterfaceID, &ppPlugInInterface, &score);
if (kIOReturnSuccess == result)
{
179
/* Call a method of the intermediate plug-in to create the device interface */
180
181
182
183
184
185
186
187
188
189
190
191
192
193
plugInResult = (*ppPlugInInterface)->QueryInterface (ppPlugInInterface,
CFUUIDGetUUIDBytes (kIOHIDDeviceInterfaceID), (void *) &(pDevice->interface));
if (S_OK != plugInResult)
HIDReportErrorNum ("CouldnÕt query HID class device interface from plugInInterface", plugInResult);
(*ppPlugInInterface)->Release (ppPlugInInterface);
}
else
HIDReportErrorNum ("Failed to create **plugInInterface via IOCreatePlugInInterfaceForService.", result);
}
if (NULL != pDevice->interface)
{
result = (*(pDevice->interface))->open (pDevice->interface, 0);
if (kIOReturnSuccess != result)
HIDReportErrorNum ("Failed to open pDevice->interface via open.", result);
194
195
196
else
(*(pDevice->interface))->setRemovalCallback (pDevice->interface, HIDRemovalCallback, pDevice, pDevice);
197
198
199
200
201
202
203
204
205
206
}
return result;
}
/* Closes and releases interface to device, should be done prior to exting application
* Note: will have no affect if device or interface do not exist
* application will "own" the device if interface is not closed
* (device may have to be plug and re-plugged in different location to get it working again without a restart)
*/
207
static IOReturn HIDCloseReleaseInterface (recDevice *pDevice)
208
209
210
211
212
{
IOReturn result = kIOReturnSuccess;
if ((NULL != pDevice) && (NULL != pDevice->interface))
{
213
/* close the interface */
214
215
216
result = (*(pDevice->interface))->close (pDevice->interface);
if (kIOReturnNotOpen == result)
{
217
/* do nothing as device was not opened, thus can't be closed */
218
219
220
}
else if (kIOReturnSuccess != result)
HIDReportErrorNum ("Failed to close IOHIDDeviceInterface.", result);
221
/* release the interface */
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
result = (*(pDevice->interface))->Release (pDevice->interface);
if (kIOReturnSuccess != result)
HIDReportErrorNum ("Failed to release IOHIDDeviceInterface.", result);
pDevice->interface = NULL;
}
return result;
}
/* extracts actual specific element information from each element CF dictionary entry */
static void HIDGetElementInfo (CFTypeRef refElement, recElement *pElement)
{
long number;
CFTypeRef refType;
refType = CFDictionaryGetValue (refElement, CFSTR(kIOHIDElementCookieKey));
if (refType && CFNumberGetValue (refType, kCFNumberLongType, &number))
pElement->cookie = (IOHIDElementCookie) number;
refType = CFDictionaryGetValue (refElement, CFSTR(kIOHIDElementMinKey));
if (refType && CFNumberGetValue (refType, kCFNumberLongType, &number))
pElement->min = number;
pElement->maxReport = pElement->min;
refType = CFDictionaryGetValue (refElement, CFSTR(kIOHIDElementMaxKey));
if (refType && CFNumberGetValue (refType, kCFNumberLongType, &number))
pElement->max = number;
pElement->minReport = pElement->max;
/*
TODO: maybe should handle the following stuff somehow?
refType = CFDictionaryGetValue (refElement, CFSTR(kIOHIDElementScaledMinKey));
if (refType && CFNumberGetValue (refType, kCFNumberLongType, &number))
pElement->scaledMin = number;
refType = CFDictionaryGetValue (refElement, CFSTR(kIOHIDElementScaledMaxKey));
if (refType && CFNumberGetValue (refType, kCFNumberLongType, &number))
pElement->scaledMax = number;
refType = CFDictionaryGetValue (refElement, CFSTR(kIOHIDElementSizeKey));
if (refType && CFNumberGetValue (refType, kCFNumberLongType, &number))
pElement->size = number;
refType = CFDictionaryGetValue (refElement, CFSTR(kIOHIDElementIsRelativeKey));
if (refType)
pElement->relative = CFBooleanGetValue (refType);
refType = CFDictionaryGetValue (refElement, CFSTR(kIOHIDElementIsWrappingKey));
if (refType)
pElement->wrapping = CFBooleanGetValue (refType);
refType = CFDictionaryGetValue (refElement, CFSTR(kIOHIDElementIsNonLinearKey));
if (refType)
pElement->nonLinear = CFBooleanGetValue (refType);
refType = CFDictionaryGetValue (refElement, CFSTR(kIOHIDElementHasPreferedStateKey));
if (refType)
pElement->preferredState = CFBooleanGetValue (refType);
refType = CFDictionaryGetValue (refElement, CFSTR(kIOHIDElementHasNullStateKey));
if (refType)
pElement->nullState = CFBooleanGetValue (refType);
*/
}
/* examines CF dictionary vlaue in device element hierarchy to determine if it is element of interest or a collection of more elements
* if element of interest allocate storage, add to list and retrieve element specific info
* if collection then pass on to deconstruction collection into additional individual elements
*/
static void HIDAddElement (CFTypeRef refElement, recDevice* pDevice)
{
recElement* element = NULL;
recElement** headElement = NULL;
long elementType, usagePage, usage;
CFTypeRef refElementType = CFDictionaryGetValue (refElement, CFSTR(kIOHIDElementTypeKey));
CFTypeRef refUsagePage = CFDictionaryGetValue (refElement, CFSTR(kIOHIDElementUsagePageKey));
CFTypeRef refUsage = CFDictionaryGetValue (refElement, CFSTR(kIOHIDElementUsageKey));
if ((refElementType) && (CFNumberGetValue (refElementType, kCFNumberLongType, &elementType)))
{
/* look at types of interest */
if ((elementType == kIOHIDElementTypeInput_Misc) || (elementType == kIOHIDElementTypeInput_Button) ||
(elementType == kIOHIDElementTypeInput_Axis))
{
if (refUsagePage && CFNumberGetValue (refUsagePage, kCFNumberLongType, &usagePage) &&
refUsage && CFNumberGetValue (refUsage, kCFNumberLongType, &usage))
{
switch (usagePage) /* only interested in kHIDPage_GenericDesktop and kHIDPage_Button */
{
case kHIDPage_GenericDesktop:
{
switch (usage) /* look at usage to determine function */
{
case kHIDUsage_GD_X:
case kHIDUsage_GD_Y:
case kHIDUsage_GD_Z:
case kHIDUsage_GD_Rx:
case kHIDUsage_GD_Ry:
case kHIDUsage_GD_Rz:
314
315
316
case kHIDUsage_GD_Slider:
case kHIDUsage_GD_Dial:
case kHIDUsage_GD_Wheel:
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
element = (recElement *) NewPtrClear (sizeof (recElement));
if (element)
{
pDevice->axes++;
headElement = &(pDevice->firstAxis);
}
break;
case kHIDUsage_GD_Hatswitch:
element = (recElement *) NewPtrClear (sizeof (recElement));
if (element)
{
pDevice->hats++;
headElement = &(pDevice->firstHat);
}
break;
}
}
break;
case kHIDPage_Button:
element = (recElement *) NewPtrClear (sizeof (recElement));
if (element)
{
pDevice->buttons++;
headElement = &(pDevice->firstButton);
}
break;
default:
break;
}
}
}
else if (kIOHIDElementTypeCollection == elementType)
HIDGetCollectionElements ((CFMutableDictionaryRef) refElement, pDevice);
}
if (element && headElement) /* add to list */
{
pDevice->elements++;
if (NULL == *headElement)
*headElement = element;
else
{
recElement *elementPrevious, *elementCurrent;
elementCurrent = *headElement;
while (elementCurrent)
{
elementPrevious = elementCurrent;
elementCurrent = elementPrevious->pNext;
}
elementPrevious->pNext = element;
}
element->pNext = NULL;
HIDGetElementInfo (refElement, element);
}
}
/* collects information from each array member in device element list (each array memeber = element) */
static void HIDGetElementsCFArrayHandler (const void * value, void * parameter)
{
if (CFGetTypeID (value) == CFDictionaryGetTypeID ())
HIDAddElement ((CFTypeRef) value, (recDevice *) parameter);
}
/* handles retrieval of element information from arrays of elements in device IO registry information */
static void HIDGetElements (CFTypeRef refElementCurrent, recDevice *pDevice)
{
CFTypeID type = CFGetTypeID (refElementCurrent);
if (type == CFArrayGetTypeID()) /* if element is an array */
{
CFRange range = {0, CFArrayGetCount (refElementCurrent)};
/* CountElementsCFArrayHandler called for each array member */
CFArrayApplyFunction (refElementCurrent, range, HIDGetElementsCFArrayHandler, pDevice);
}
}
/* handles extracting element information from element collection CF types
* used from top level element decoding and hierarchy deconstruction to flatten device element list
*/
static void HIDGetCollectionElements (CFMutableDictionaryRef deviceProperties, recDevice *pDevice)
{
CFTypeRef refElementTop = CFDictionaryGetValue (deviceProperties, CFSTR(kIOHIDElementKey));
if (refElementTop)
HIDGetElements (refElementTop, pDevice);
}
/* use top level element usage page and usage to discern device usage page and usage setting appropriate vlaues in device record */
static void HIDTopLevelElementHandler (const void * value, void * parameter)
{
CFTypeRef refCF = 0;
if (CFGetTypeID (value) != CFDictionaryGetTypeID ())
return;
refCF = CFDictionaryGetValue (value, CFSTR(kIOHIDElementUsagePageKey));
if (!CFNumberGetValue (refCF, kCFNumberLongType, &((recDevice *) parameter)->usagePage))
SDL_SetError ("CFNumberGetValue error retrieving pDevice->usagePage.");
refCF = CFDictionaryGetValue (value, CFSTR(kIOHIDElementUsageKey));
if (!CFNumberGetValue (refCF, kCFNumberLongType, &((recDevice *) parameter)->usage))
SDL_SetError ("CFNumberGetValue error retrieving pDevice->usage.");
}
/* extracts device info from CF dictionary records in IO registry */
static void HIDGetDeviceInfo (io_object_t hidDevice, CFMutableDictionaryRef hidProperties, recDevice *pDevice)
{
CFMutableDictionaryRef usbProperties = 0;
io_registry_entry_t parent1, parent2;
/* Mac OS X currently is not mirroring all USB properties to HID page so need to look at USB device page also
* get dictionary for usb properties: step up two levels and get CF dictionary for USB properties
*/
if ((KERN_SUCCESS == IORegistryEntryGetParentEntry (hidDevice, kIOServicePlane, &parent1)) &&
(KERN_SUCCESS == IORegistryEntryGetParentEntry (parent1, kIOServicePlane, &parent2)) &&
(KERN_SUCCESS == IORegistryEntryCreateCFProperties (parent2, &usbProperties, kCFAllocatorDefault, kNilOptions)))
{
if (usbProperties)
{
CFTypeRef refCF = 0;
/* get device info
* try hid dictionary first, if fail then go to usb dictionary
*/
/* get product name */
refCF = CFDictionaryGetValue (hidProperties, CFSTR(kIOHIDProductKey));
if (!refCF)
refCF = CFDictionaryGetValue (usbProperties, CFSTR("USB Product Name"));
if (refCF)
{
if (!CFStringGetCString (refCF, pDevice->product, 256, CFStringGetSystemEncoding ()))
SDL_SetError ("CFStringGetCString error retrieving pDevice->product.");
}
/* get usage page and usage */
refCF = CFDictionaryGetValue (hidProperties, CFSTR(kIOHIDPrimaryUsagePageKey));
if (refCF)
{
if (!CFNumberGetValue (refCF, kCFNumberLongType, &pDevice->usagePage))
SDL_SetError ("CFNumberGetValue error retrieving pDevice->usagePage.");
refCF = CFDictionaryGetValue (hidProperties, CFSTR(kIOHIDPrimaryUsageKey));
if (refCF)
if (!CFNumberGetValue (refCF, kCFNumberLongType, &pDevice->usage))
SDL_SetError ("CFNumberGetValue error retrieving pDevice->usage.");
}
if (NULL == refCF) /* get top level element HID usage page or usage */
{
/* use top level element instead */
CFTypeRef refCFTopElement = 0;
refCFTopElement = CFDictionaryGetValue (hidProperties, CFSTR(kIOHIDElementKey));
{
/* refCFTopElement points to an array of element dictionaries */
CFRange range = {0, CFArrayGetCount (refCFTopElement)};
CFArrayApplyFunction (refCFTopElement, range, HIDTopLevelElementHandler, pDevice);
}
}
CFRelease (usbProperties);
}
else
SDL_SetError ("IORegistryEntryCreateCFProperties failed to create usbProperties.");
if (kIOReturnSuccess != IOObjectRelease (parent2))
SDL_SetError ("IOObjectRelease error with parent2.");
if (kIOReturnSuccess != IOObjectRelease (parent1))
SDL_SetError ("IOObjectRelease error with parent1.");
}
}
static recDevice *HIDBuildDevice (io_object_t hidDevice)
{
recDevice *pDevice = (recDevice *) NewPtrClear (sizeof (recDevice));
if (pDevice)
{
/* get dictionary for HID properties */
CFMutableDictionaryRef hidProperties = 0;
kern_return_t result = IORegistryEntryCreateCFProperties (hidDevice, &hidProperties, kCFAllocatorDefault, kNilOptions);
if ((result == KERN_SUCCESS) && hidProperties)
{
/* create device interface */
result = HIDCreateOpenDeviceInterface (hidDevice, pDevice);
if (kIOReturnSuccess == result)
{
HIDGetDeviceInfo (hidDevice, hidProperties, pDevice); /* hidDevice used to find parents in registry tree */
HIDGetCollectionElements (hidProperties, pDevice);
}
else
{
508
DisposePtr((Ptr)pDevice);
509
510
511
512
513
514
pDevice = NULL;
}
CFRelease (hidProperties);
}
else
{
515
DisposePtr((Ptr)pDevice);
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
pDevice = NULL;
}
}
return pDevice;
}
/* disposes of the element list associated with a device and the memory associated with the list
*/
static void HIDDisposeElementList (recElement **elementList)
{
recElement *pElement = *elementList;
while (pElement)
{
recElement *pElementNext = pElement->pNext;
DisposePtr ((Ptr) pElement);
pElement = pElementNext;
}
*elementList = NULL;
}
/* disposes of a single device, closing and releaseing interface, freeing memory fro device and elements, setting device pointer to NULL
* all your device no longer belong to us... (i.e., you do not 'own' the device anymore)
*/
static recDevice *HIDDisposeDevice (recDevice **ppDevice)
{
kern_return_t result = KERN_SUCCESS;
recDevice *pDeviceNext = NULL;
if (*ppDevice)
{
547
/* save next device prior to disposing of this device */
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
pDeviceNext = (*ppDevice)->pNext;
/* free element lists */
HIDDisposeElementList (&(*ppDevice)->firstAxis);
HIDDisposeElementList (&(*ppDevice)->firstButton);
HIDDisposeElementList (&(*ppDevice)->firstHat);
result = HIDCloseReleaseInterface (*ppDevice); /* function sanity checks interface value (now application does not own device) */
if (kIOReturnSuccess != result)
HIDReportErrorNum ("HIDCloseReleaseInterface failed when trying to dipose device.", result);
DisposePtr ((Ptr)*ppDevice);
*ppDevice = NULL;
}
return pDeviceNext;
}
/* 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;
573
574
mach_port_t masterPort = 0;
io_iterator_t hidObjectIterator = 0;
575
576
CFMutableDictionaryRef hidMatchDictionary = NULL;
recDevice *device, *lastDevice;
577
io_object_t ioHIDDeviceObject = 0;
578
579
580
SDL_numjoysticks = 0;
581
if (!gpDeviceList)
582
583
584
585
586
587
588
589
590
591
592
593
594
595
{
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);
596
if (hidMatchDictionary)
597
598
{
/* Add key for device type (joystick, in this case) to refine the matching dictionary. */
599
600
601
602
/* NOTE: we now perform this filtering later
UInt32 usagePage = kHIDPage_GenericDesktop;
UInt32 usage = kHIDUsage_GD_Joystick;
603
604
CFNumberRef refUsage = NULL, refUsagePage = NULL;
605
refUsage = CFNumberCreate (kCFAllocatorDefault, kCFNumberIntType, &usage);
606
CFDictionarySetValue (hidMatchDictionary, CFSTR (kIOHIDPrimaryUsageKey), refUsage);
607
refUsagePage = CFNumberCreate (kCFAllocatorDefault, kCFNumberIntType, &usagePage);
608
CFDictionarySetValue (hidMatchDictionary, CFSTR (kIOHIDPrimaryUsagePageKey), refUsagePage);
609
*/
610
611
612
613
614
615
616
617
618
619
}
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 */
620
if (kIOReturnSuccess != result)
621
622
623
624
{
SDL_SetError("Joystick: Couldn't create a HID object iterator.");
return -1;
}
625
if (!hidObjectIterator) /* there are no joysticks */
626
627
628
629
630
{
gpDeviceList = NULL;
SDL_numjoysticks = 0;
return 0;
}
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
/* 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 = lastDevice = NULL;
while ((ioHIDDeviceObject = IOIteratorNext (hidObjectIterator)))
{
/* build a device record */
device = HIDBuildDevice (ioHIDDeviceObject);
if (!device)
continue;
/* dump device object, it is no longer needed */
result = IOObjectRelease (ioHIDDeviceObject);
646
647
648
/* if (KERN_SUCCESS != result)
HIDReportErrorNum ("IOObjectRelease error with ioHIDDeviceObject.", result);
*/
649
650
/* Filter device list to non-keyboard/mouse stuff */
651
652
653
if ( (device->usagePage != kHIDPage_GenericDesktop) ||
((device->usage != kHIDUsage_GD_Joystick &&
device->usage != kHIDUsage_GD_GamePad)) ) {
654
655
656
657
658
659
660
/* release memory for the device */
HIDDisposeDevice (&device);
DisposePtr((Ptr)device);
continue;
}
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
/* Add device to the end of the list */
if (lastDevice)
lastDevice->pNext = device;
else
gpDeviceList = device;
lastDevice = device;
}
result = IOObjectRelease (hidObjectIterator); /* release the iterator */
/* Count the total number of devices we found */
device = gpDeviceList;
while (device)
{
SDL_numjoysticks++;
device = device->pNext;
}
return SDL_numjoysticks;
}
/* Function to get the device-dependent name of a joystick */
const char *SDL_SYS_JoystickName(int index)
{
recDevice *device = gpDeviceList;
for (; index > 0; index--)
device = device->pNext;
return device->product;
}
/* Function to open a joystick for use.
* The joystick to open is specified by the index field of the joystick.
* This should fill the nbuttons and naxes fields of the joystick structure.
* It returns 0, or -1 if there is an error.
*/
int SDL_SYS_JoystickOpen(SDL_Joystick *joystick)
{
recDevice *device = gpDeviceList;
int index;
for (index = joystick->index; index > 0; index--)
device = device->pNext;
joystick->hwdata = device;
joystick->name = device->product;
joystick->naxes = device->axes;
joystick->nhats = device->hats;
joystick->nballs = 0;
joystick->nbuttons = device->buttons;
return 0;
}
/* Function to update the state of a joystick - called as a device poll.
* This function shouldn't update the joystick structure directly,
* but instead should call SDL_PrivateJoystick*() to deliver events
* and update joystick device state.
*/
void SDL_SYS_JoystickUpdate(SDL_Joystick *joystick)
{
recDevice *device = joystick->hwdata;
recElement *element;
SInt32 value;
int i;
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
if (device->removed) /* device was unplugged; ignore it. */
{
if (device->uncentered)
{
device->uncentered = 0;
/* Tell the app that everything is centered/unpressed... */
for (i = 0; i < device->axes; i++)
SDL_PrivateJoystickAxis(joystick, i, 0);
for (i = 0; i < device->buttons; i++)
SDL_PrivateJoystickButton(joystick, i, 0);
for (i = 0; i < device->hats; i++)
SDL_PrivateJoystickHat(joystick, i, SDL_HAT_CENTERED);
}
return;
}
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
element = device->firstAxis;
i = 0;
while (element)
{
value = HIDScaledCalibratedValue(device, element, -32768, 32767);
if ( value != joystick->axes[i] )
SDL_PrivateJoystickAxis(joystick, i, value);
element = element->pNext;
++i;
}
element = device->firstButton;
i = 0;
while (element)
{
value = HIDGetElementValue(device, element);
764
765
if (value > 1) /* handle pressure-sensitive buttons */
value = 1;
766
767
768
769
770
if ( value != joystick->buttons[i] )
SDL_PrivateJoystickButton(joystick, i, value);
element = element->pNext;
++i;
}
771
772
773
774
775
element = device->firstHat;
i = 0;
while (element)
{
776
Uint8 pos = 0;
777
778
value = HIDGetElementValue(device, element);
779
780
781
782
if (element->max == 3) /* 4 position hatswitch - scale up value */
value *= 2;
else if (element->max != 7) /* Neither a 4 nor 8 positions - fall back to default position (centered) */
value = -1;
783
784
785
786
787
switch(value)
{
case 0:
pos = SDL_HAT_UP;
break;
788
case 1:
789
790
pos = SDL_HAT_RIGHTUP;
break;
791
case 2:
792
793
pos = SDL_HAT_RIGHT;
break;
794
case 3:
795
796
pos = SDL_HAT_RIGHTDOWN;
break;
797
case 4:
798
799
pos = SDL_HAT_DOWN;
break;
800
case 5:
801
802
pos = SDL_HAT_LEFTDOWN;
break;
803
case 6:
804
805
pos = SDL_HAT_LEFT;
break;
806
case 7:
807
808
pos = SDL_HAT_LEFTUP;
break;
809
810
811
812
813
814
815
default:
/* Every other value is mapped to center. We do that because some
* joysticks use 8 and some 15 for this value, and apparently
* there are even more variants out there - so we try to be generous.
*/
pos = SDL_HAT_CENTERED;
break;
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
}
if ( pos != joystick->hats[i] )
SDL_PrivateJoystickHat(joystick, i, pos);
element = element->pNext;
++i;
}
return;
}
/* Function to close a joystick after use */
void SDL_SYS_JoystickClose(SDL_Joystick *joystick)
{
/* Should we do anything here? */
return;
}
/* Function to perform any system-specific joystick related cleanup */
void SDL_SYS_JoystickQuit(void)
{
while (NULL != gpDeviceList)
gpDeviceList = HIDDisposeDevice (&gpDeviceList);
}