-
Notifications
You must be signed in to change notification settings - Fork 408
/
Copy pathhid.c
1558 lines (1290 loc) · 42.7 KB
/
hid.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
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
314
315
316
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
508
509
510
511
512
513
514
515
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
547
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
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
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
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/*******************************************************
HIDAPI - Multi-Platform library for
communication with HID devices.
Alan Ott
Signal 11 Software
libusb/hidapi Team
Copyright 2022, All Rights Reserved.
At the discretion of the user of this library,
this software may be licensed under the terms of the
GNU General Public License v3, a BSD-Style license, or the
original HIDAPI license as outlined in the LICENSE.txt,
LICENSE-gpl3.txt, LICENSE-bsd.txt, and LICENSE-orig.txt
files located at the root of the source distribution.
These files may also be found in the public source
code repository located at:
https://github.com/libusb/hidapi .
********************************************************/
/* See Apple Technical Note TN2187 for details on IOHidManager. */
#include <IOKit/hid/IOHIDManager.h>
#include <IOKit/hid/IOHIDKeys.h>
#include <IOKit/IOKitLib.h>
#include <IOKit/usb/USBSpec.h>
#include <CoreFoundation/CoreFoundation.h>
#include <mach/mach_error.h>
#include <stdbool.h>
#include <wchar.h>
#include <locale.h>
#include <pthread.h>
#include <sys/time.h>
#include <unistd.h>
#include <dlfcn.h>
#include "hidapi_darwin.h"
/* Barrier implementation because Mac OSX doesn't have pthread_barrier.
It also doesn't have clock_gettime(). So much for POSIX and SUSv2.
This implementation came from Brent Priddy and was posted on
StackOverflow. It is used with his permission. */
typedef int pthread_barrierattr_t;
typedef struct pthread_barrier {
pthread_mutex_t mutex;
pthread_cond_t cond;
int count;
int trip_count;
} pthread_barrier_t;
static int pthread_barrier_init(pthread_barrier_t *barrier, const pthread_barrierattr_t *attr, unsigned int count)
{
(void) attr;
if (count == 0) {
errno = EINVAL;
return -1;
}
if (pthread_mutex_init(&barrier->mutex, 0) < 0) {
return -1;
}
if (pthread_cond_init(&barrier->cond, 0) < 0) {
pthread_mutex_destroy(&barrier->mutex);
return -1;
}
barrier->trip_count = count;
barrier->count = 0;
return 0;
}
static int pthread_barrier_destroy(pthread_barrier_t *barrier)
{
pthread_cond_destroy(&barrier->cond);
pthread_mutex_destroy(&barrier->mutex);
return 0;
}
static int pthread_barrier_wait(pthread_barrier_t *barrier)
{
pthread_mutex_lock(&barrier->mutex);
++(barrier->count);
if (barrier->count >= barrier->trip_count) {
barrier->count = 0;
pthread_mutex_unlock(&barrier->mutex);
pthread_cond_broadcast(&barrier->cond);
return 1;
}
else {
do {
pthread_cond_wait(&barrier->cond, &(barrier->mutex));
}
while (barrier->count != 0);
pthread_mutex_unlock(&barrier->mutex);
return 0;
}
}
static int return_data(hid_device *dev, unsigned char *data, size_t length);
/* Linked List of input reports received from the device. */
struct input_report {
uint8_t *data;
size_t len;
struct input_report *next;
};
static struct hid_api_version api_version = {
.major = HID_API_VERSION_MAJOR,
.minor = HID_API_VERSION_MINOR,
.patch = HID_API_VERSION_PATCH
};
/* - Run context - */
static IOHIDManagerRef hid_mgr = 0x0;
static int is_macos_10_10_or_greater = 0;
static IOOptionBits device_open_options = 0;
static wchar_t *last_global_error_str = NULL;
/* --- */
struct hid_device_ {
IOHIDDeviceRef device_handle;
IOOptionBits open_options;
int blocking;
int disconnected;
CFStringRef run_loop_mode;
CFRunLoopRef run_loop;
CFRunLoopSourceRef source;
uint8_t *input_report_buf;
CFIndex max_input_report_len;
struct input_report *input_reports;
struct hid_device_info* device_info;
pthread_t thread;
pthread_mutex_t mutex; /* Protects input_reports */
pthread_cond_t condition;
pthread_barrier_t barrier; /* Ensures correct startup sequence */
pthread_barrier_t shutdown_barrier; /* Ensures correct shutdown sequence */
int shutdown_thread;
wchar_t *last_error_str;
};
static hid_device *new_hid_device(void)
{
hid_device *dev = (hid_device*) calloc(1, sizeof(hid_device));
if (dev == NULL) {
return NULL;
}
dev->device_handle = NULL;
dev->open_options = device_open_options;
dev->blocking = 1;
dev->disconnected = 0;
dev->run_loop_mode = NULL;
dev->run_loop = NULL;
dev->source = NULL;
dev->input_report_buf = NULL;
dev->input_reports = NULL;
dev->device_info = NULL;
dev->shutdown_thread = 0;
dev->last_error_str = NULL;
/* Thread objects */
pthread_mutex_init(&dev->mutex, NULL);
pthread_cond_init(&dev->condition, NULL);
pthread_barrier_init(&dev->barrier, NULL, 2);
pthread_barrier_init(&dev->shutdown_barrier, NULL, 2);
return dev;
}
static void free_hid_device(hid_device *dev)
{
if (!dev)
return;
/* Delete any input reports still left over. */
struct input_report *rpt = dev->input_reports;
while (rpt) {
struct input_report *next = rpt->next;
free(rpt->data);
free(rpt);
rpt = next;
}
/* Free the string and the report buffer. The check for NULL
is necessary here as CFRelease() doesn't handle NULL like
free() and others do. */
if (dev->run_loop_mode)
CFRelease(dev->run_loop_mode);
if (dev->source)
CFRelease(dev->source);
free(dev->input_report_buf);
free(dev->last_error_str);
hid_free_enumeration(dev->device_info);
/* Clean up the thread objects */
pthread_barrier_destroy(&dev->shutdown_barrier);
pthread_barrier_destroy(&dev->barrier);
pthread_cond_destroy(&dev->condition);
pthread_mutex_destroy(&dev->mutex);
/* Free the structure itself. */
free(dev);
}
/* The caller must free the returned string with free(). */
static wchar_t *utf8_to_wchar_t(const char *utf8)
{
wchar_t *ret = NULL;
if (utf8) {
size_t wlen = mbstowcs(NULL, utf8, 0);
if ((size_t) -1 == wlen) {
return wcsdup(L"");
}
ret = (wchar_t*) calloc(wlen+1, sizeof(wchar_t));
if (ret == NULL) {
/* as much as we can do at this point */
return NULL;
}
mbstowcs(ret, utf8, wlen+1);
ret[wlen] = 0x0000;
}
return ret;
}
/* Makes a copy of the given error message (and decoded according to the
* currently locale) into the wide string pointer pointed by error_str.
* The last stored error string is freed.
* Use register_error_str(NULL) to free the error message completely. */
static void register_error_str(wchar_t **error_str, const char *msg)
{
free(*error_str);
*error_str = utf8_to_wchar_t(msg);
}
/* Similar to register_error_str, but allows passing a format string with va_list args into this function. */
static void register_error_str_vformat(wchar_t **error_str, const char *format, va_list args)
{
char msg[1024];
vsnprintf(msg, sizeof(msg), format, args);
register_error_str(error_str, msg);
}
/* Set the last global error to be reported by hid_error(NULL).
* The given error message will be copied (and decoded according to the
* currently locale, so do not pass in string constants).
* The last stored global error message is freed.
* Use register_global_error(NULL) to indicate "no error". */
static void register_global_error(const char *msg)
{
register_error_str(&last_global_error_str, msg);
}
/* Similar to register_global_error, but allows passing a format string into this function. */
static void register_global_error_format(const char *format, ...)
{
va_list args;
va_start(args, format);
register_error_str_vformat(&last_global_error_str, format, args);
va_end(args);
}
/* Set the last error for a device to be reported by hid_error(dev).
* The given error message will be copied (and decoded according to the
* currently locale, so do not pass in string constants).
* The last stored device error message is freed.
* Use register_device_error(dev, NULL) to indicate "no error". */
static void register_device_error(hid_device *dev, const char *msg)
{
register_error_str(&dev->last_error_str, msg);
}
/* Similar to register_device_error, but you can pass a format string into this function. */
static void register_device_error_format(hid_device *dev, const char *format, ...)
{
va_list args;
va_start(args, format);
register_error_str_vformat(&dev->last_error_str, format, args);
va_end(args);
}
static CFArrayRef get_array_property(IOHIDDeviceRef device, CFStringRef key)
{
CFTypeRef ref = IOHIDDeviceGetProperty(device, key);
if (ref != NULL && CFGetTypeID(ref) == CFArrayGetTypeID()) {
return (CFArrayRef)ref;
} else {
return NULL;
}
}
static int32_t get_int_property(IOHIDDeviceRef device, CFStringRef key)
{
CFTypeRef ref;
int32_t value = 0;
ref = IOHIDDeviceGetProperty(device, key);
if (ref) {
if (CFGetTypeID(ref) == CFNumberGetTypeID()) {
CFNumberGetValue((CFNumberRef) ref, kCFNumberSInt32Type, &value);
return value;
}
}
return 0;
}
static bool try_get_int_property(IOHIDDeviceRef device, CFStringRef key, int32_t *out_val)
{
bool result = false;
CFTypeRef ref;
ref = IOHIDDeviceGetProperty(device, key);
if (ref) {
if (CFGetTypeID(ref) == CFNumberGetTypeID()) {
result = CFNumberGetValue((CFNumberRef) ref, kCFNumberSInt32Type, out_val);
}
}
return result;
}
static bool try_get_ioregistry_int_property(io_service_t service, CFStringRef property, int32_t *out_val)
{
bool result = false;
CFTypeRef ref = IORegistryEntryCreateCFProperty(service, property, kCFAllocatorDefault, 0);
if (ref) {
if (CFGetTypeID(ref) == CFNumberGetTypeID()) {
result = CFNumberGetValue(ref, kCFNumberSInt32Type, out_val);
}
CFRelease(ref);
}
return result;
}
static CFArrayRef get_usage_pairs(IOHIDDeviceRef device)
{
return get_array_property(device, CFSTR(kIOHIDDeviceUsagePairsKey));
}
static unsigned short get_vendor_id(IOHIDDeviceRef device)
{
return get_int_property(device, CFSTR(kIOHIDVendorIDKey));
}
static unsigned short get_product_id(IOHIDDeviceRef device)
{
return get_int_property(device, CFSTR(kIOHIDProductIDKey));
}
static int32_t get_max_report_length(IOHIDDeviceRef device)
{
return get_int_property(device, CFSTR(kIOHIDMaxInputReportSizeKey));
}
static int get_string_property(IOHIDDeviceRef device, CFStringRef prop, wchar_t *buf, size_t len)
{
CFStringRef str;
if (!len)
return 0;
str = (CFStringRef) IOHIDDeviceGetProperty(device, prop);
buf[0] = 0;
if (str && CFGetTypeID(str) == CFStringGetTypeID()) {
CFIndex str_len = CFStringGetLength(str);
CFRange range;
CFIndex used_buf_len;
CFIndex chars_copied;
len --;
range.location = 0;
range.length = ((size_t) str_len > len)? len: (size_t) str_len;
chars_copied = CFStringGetBytes(str,
range,
kCFStringEncodingUTF32LE,
(char) '?',
FALSE,
(UInt8*)buf,
len * sizeof(wchar_t),
&used_buf_len);
if (chars_copied <= 0)
buf[0] = 0;
else
buf[chars_copied] = 0;
return 0;
}
else
return -1;
}
static int get_serial_number(IOHIDDeviceRef device, wchar_t *buf, size_t len)
{
return get_string_property(device, CFSTR(kIOHIDSerialNumberKey), buf, len);
}
static int get_manufacturer_string(IOHIDDeviceRef device, wchar_t *buf, size_t len)
{
return get_string_property(device, CFSTR(kIOHIDManufacturerKey), buf, len);
}
static int get_product_string(IOHIDDeviceRef device, wchar_t *buf, size_t len)
{
return get_string_property(device, CFSTR(kIOHIDProductKey), buf, len);
}
/* Implementation of wcsdup() for Mac. */
static wchar_t *dup_wcs(const wchar_t *s)
{
size_t len = wcslen(s);
wchar_t *ret = (wchar_t*) malloc((len+1)*sizeof(wchar_t));
wcscpy(ret, s);
return ret;
}
/* Initialize the IOHIDManager. Return 0 for success and -1 for failure. */
static int init_hid_manager(void)
{
/* Initialize all the HID Manager Objects */
hid_mgr = IOHIDManagerCreate(kCFAllocatorDefault, kIOHIDOptionsTypeNone);
if (hid_mgr) {
IOHIDManagerSetDeviceMatching(hid_mgr, NULL);
IOHIDManagerScheduleWithRunLoop(hid_mgr, CFRunLoopGetCurrent(), kCFRunLoopDefaultMode);
return 0;
}
register_global_error("Failed to create IOHIDManager");
return -1;
}
HID_API_EXPORT const struct hid_api_version* HID_API_CALL hid_version(void)
{
return &api_version;
}
HID_API_EXPORT const char* HID_API_CALL hid_version_str(void)
{
return HID_API_VERSION_STR;
}
/* Initialize the IOHIDManager if necessary. This is the public function, and
it is safe to call this function repeatedly. Return 0 for success and -1
for failure. */
int HID_API_EXPORT hid_init(void)
{
register_global_error(NULL);
if (!hid_mgr) {
is_macos_10_10_or_greater = (kCFCoreFoundationVersionNumber >= 1151.16); /* kCFCoreFoundationVersionNumber10_10 */
hid_darwin_set_open_exclusive(1); /* Backward compatibility */
return init_hid_manager();
}
/* Already initialized. */
return 0;
}
int HID_API_EXPORT hid_exit(void)
{
if (hid_mgr) {
/* Close the HID manager. */
IOHIDManagerClose(hid_mgr, kIOHIDOptionsTypeNone);
CFRelease(hid_mgr);
hid_mgr = NULL;
}
/* Free global error message */
register_global_error(NULL);
return 0;
}
static void process_pending_events(void) {
SInt32 res;
do {
res = CFRunLoopRunInMode(kCFRunLoopDefaultMode, 0.001, FALSE);
} while(res != kCFRunLoopRunFinished && res != kCFRunLoopRunTimedOut);
}
static int read_usb_interface_from_hid_service_parent(io_service_t hid_service)
{
int32_t result = -1;
bool success = false;
io_registry_entry_t current = IO_OBJECT_NULL;
kern_return_t res;
int parent_number = 0;
res = IORegistryEntryGetParentEntry(hid_service, kIOServicePlane, ¤t);
while (KERN_SUCCESS == res
/* Only search up to 3 parent entries.
* With the default driver - the parent-of-interest supposed to be the first one,
* but lets assume some custom drivers or so, with deeper tree. */
&& parent_number < 3) {
io_registry_entry_t parent = IO_OBJECT_NULL;
int32_t interface_number = -1;
parent_number++;
success = try_get_ioregistry_int_property(current, CFSTR(kUSBInterfaceNumber), &interface_number);
if (success) {
result = interface_number;
break;
}
res = IORegistryEntryGetParentEntry(current, kIOServicePlane, &parent);
if (parent) {
IOObjectRelease(current);
current = parent;
}
}
if (current) {
IOObjectRelease(current);
current = IO_OBJECT_NULL;
}
return result;
}
static struct hid_device_info *create_device_info_with_usage(IOHIDDeviceRef dev, int32_t usage_page, int32_t usage)
{
unsigned short dev_vid;
unsigned short dev_pid;
int BUF_LEN = 256;
wchar_t buf[BUF_LEN];
CFTypeRef transport_prop;
struct hid_device_info *cur_dev;
io_service_t hid_service;
kern_return_t res;
uint64_t entry_id = 0;
if (dev == NULL) {
return NULL;
}
cur_dev = (struct hid_device_info *)calloc(1, sizeof(struct hid_device_info));
if (cur_dev == NULL) {
return NULL;
}
dev_vid = get_vendor_id(dev);
dev_pid = get_product_id(dev);
cur_dev->usage_page = usage_page;
cur_dev->usage = usage;
/* Fill out the record */
cur_dev->next = NULL;
/* Fill in the path (as a unique ID of the service entry) */
cur_dev->path = NULL;
hid_service = IOHIDDeviceGetService(dev);
if (hid_service != MACH_PORT_NULL) {
res = IORegistryEntryGetRegistryEntryID(hid_service, &entry_id);
}
else {
res = KERN_INVALID_ARGUMENT;
}
if (res == KERN_SUCCESS) {
/* max value of entry_id(uint64_t) is 18446744073709551615 which is 20 characters long,
so for (max) "path" string 'DevSrvsID:18446744073709551615' we would need
9+1+20+1=31 bytes buffer, but allocate 32 for simple alignment */
const size_t path_len = 32;
cur_dev->path = calloc(1, path_len);
if (cur_dev->path != NULL) {
snprintf(cur_dev->path, path_len, "DevSrvsID:%llu", entry_id);
}
}
if (cur_dev->path == NULL) {
/* for whatever reason, trying to keep it a non-NULL string */
cur_dev->path = strdup("");
}
/* Serial Number */
get_serial_number(dev, buf, BUF_LEN);
cur_dev->serial_number = dup_wcs(buf);
/* Manufacturer and Product strings */
get_manufacturer_string(dev, buf, BUF_LEN);
cur_dev->manufacturer_string = dup_wcs(buf);
get_product_string(dev, buf, BUF_LEN);
cur_dev->product_string = dup_wcs(buf);
/* VID/PID */
cur_dev->vendor_id = dev_vid;
cur_dev->product_id = dev_pid;
/* Release Number */
cur_dev->release_number = get_int_property(dev, CFSTR(kIOHIDVersionNumberKey));
/* Interface Number.
* We can only retrieve the interface number for USB HID devices.
* See below */
cur_dev->interface_number = -1;
/* Bus Type */
transport_prop = IOHIDDeviceGetProperty(dev, CFSTR(kIOHIDTransportKey));
if (transport_prop != NULL && CFGetTypeID(transport_prop) == CFStringGetTypeID()) {
if (CFStringCompare((CFStringRef)transport_prop, CFSTR(kIOHIDTransportUSBValue), 0) == kCFCompareEqualTo) {
int32_t interface_number = -1;
cur_dev->bus_type = HID_API_BUS_USB;
/* A IOHIDDeviceRef used to have this simple property,
* until macOS 13.3 - we will try to use it. */
if (try_get_int_property(dev, CFSTR(kUSBInterfaceNumber), &interface_number)) {
cur_dev->interface_number = interface_number;
} else {
/* Otherwise fallback to io_service_t property.
* (of one of the parent services). */
cur_dev->interface_number = read_usb_interface_from_hid_service_parent(hid_service);
/* If the above doesn't work -
* no (known) fallback exists at this point. */
}
/* Match "Bluetooth", "BluetoothLowEnergy" and "Bluetooth Low Energy" strings */
} else if (CFStringHasPrefix((CFStringRef)transport_prop, CFSTR(kIOHIDTransportBluetoothValue))) {
cur_dev->bus_type = HID_API_BUS_BLUETOOTH;
} else if (CFStringCompare((CFStringRef)transport_prop, CFSTR(kIOHIDTransportI2CValue), 0) == kCFCompareEqualTo) {
cur_dev->bus_type = HID_API_BUS_I2C;
} else if (CFStringCompare((CFStringRef)transport_prop, CFSTR(kIOHIDTransportSPIValue), 0) == kCFCompareEqualTo) {
cur_dev->bus_type = HID_API_BUS_SPI;
}
}
return cur_dev;
}
static struct hid_device_info *create_device_info(IOHIDDeviceRef device)
{
const int32_t primary_usage_page = get_int_property(device, CFSTR(kIOHIDPrimaryUsagePageKey));
const int32_t primary_usage = get_int_property(device, CFSTR(kIOHIDPrimaryUsageKey));
/* Primary should always be first, to match previous behavior. */
struct hid_device_info *root = create_device_info_with_usage(device, primary_usage_page, primary_usage);
struct hid_device_info *cur = root;
if (!root)
return NULL;
CFArrayRef usage_pairs = get_usage_pairs(device);
if (usage_pairs != NULL) {
struct hid_device_info *next = NULL;
for (CFIndex i = 0; i < CFArrayGetCount(usage_pairs); i++) {
CFTypeRef dict = CFArrayGetValueAtIndex(usage_pairs, i);
if (CFGetTypeID(dict) != CFDictionaryGetTypeID()) {
continue;
}
CFTypeRef usage_page_ref, usage_ref;
int32_t usage_page, usage;
if (!CFDictionaryGetValueIfPresent((CFDictionaryRef)dict, CFSTR(kIOHIDDeviceUsagePageKey), &usage_page_ref) ||
!CFDictionaryGetValueIfPresent((CFDictionaryRef)dict, CFSTR(kIOHIDDeviceUsageKey), &usage_ref) ||
CFGetTypeID(usage_page_ref) != CFNumberGetTypeID() ||
CFGetTypeID(usage_ref) != CFNumberGetTypeID() ||
!CFNumberGetValue((CFNumberRef)usage_page_ref, kCFNumberSInt32Type, &usage_page) ||
!CFNumberGetValue((CFNumberRef)usage_ref, kCFNumberSInt32Type, &usage)) {
continue;
}
if (usage_page == primary_usage_page && usage == primary_usage)
continue; /* Already added. */
next = create_device_info_with_usage(device, usage_page, usage);
cur->next = next;
if (next != NULL) {
cur = next;
}
}
}
return root;
}
struct hid_device_info HID_API_EXPORT *hid_enumerate(unsigned short vendor_id, unsigned short product_id)
{
struct hid_device_info *root = NULL; /* return object */
struct hid_device_info *cur_dev = NULL;
CFIndex num_devices;
int i;
/* Set up the HID Manager if it hasn't been done */
if (hid_init() < 0) {
return NULL;
}
/* register_global_error: global error is set/reset by hid_init */
/* give the IOHIDManager a chance to update itself */
process_pending_events();
/* Get a list of the Devices */
CFMutableDictionaryRef matching = NULL;
if (vendor_id != 0 || product_id != 0) {
matching = CFDictionaryCreateMutable(kCFAllocatorDefault, kIOHIDOptionsTypeNone, &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);
if (matching && vendor_id != 0) {
CFNumberRef v = CFNumberCreate(kCFAllocatorDefault, kCFNumberShortType, &vendor_id);
CFDictionarySetValue(matching, CFSTR(kIOHIDVendorIDKey), v);
CFRelease(v);
}
if (matching && product_id != 0) {
CFNumberRef p = CFNumberCreate(kCFAllocatorDefault, kCFNumberShortType, &product_id);
CFDictionarySetValue(matching, CFSTR(kIOHIDProductIDKey), p);
CFRelease(p);
}
}
IOHIDManagerSetDeviceMatching(hid_mgr, matching);
if (matching != NULL) {
CFRelease(matching);
}
CFSetRef device_set = IOHIDManagerCopyDevices(hid_mgr);
IOHIDDeviceRef *device_array = NULL;
if (device_set != NULL) {
/* Convert the list into a C array so we can iterate easily. */
num_devices = CFSetGetCount(device_set);
device_array = (IOHIDDeviceRef*) calloc(num_devices, sizeof(IOHIDDeviceRef));
CFSetGetValues(device_set, (const void **) device_array);
} else {
num_devices = 0;
}
/* Iterate over each device, making an entry for it. */
for (i = 0; i < num_devices; i++) {
IOHIDDeviceRef dev = device_array[i];
if (!dev) {
continue;
}
struct hid_device_info *tmp = create_device_info(dev);
if (tmp == NULL) {
continue;
}
if (cur_dev) {
cur_dev->next = tmp;
}
else {
root = tmp;
}
cur_dev = tmp;
/* move the pointer to the tail of returned list */
while (cur_dev->next != NULL) {
cur_dev = cur_dev->next;
}
}
free(device_array);
if (device_set != NULL)
CFRelease(device_set);
if (root == NULL) {
if (vendor_id == 0 && product_id == 0) {
register_global_error("No HID devices found in the system.");
} else {
register_global_error("No HID devices with requested VID/PID found in the system.");
}
}
return root;
}
void HID_API_EXPORT hid_free_enumeration(struct hid_device_info *devs)
{
/* This function is identical to the Linux version. Platform independent. */
struct hid_device_info *d = devs;
while (d) {
struct hid_device_info *next = d->next;
free(d->path);
free(d->serial_number);
free(d->manufacturer_string);
free(d->product_string);
free(d);
d = next;
}
}
hid_device * HID_API_EXPORT hid_open(unsigned short vendor_id, unsigned short product_id, const wchar_t *serial_number)
{
/* This function is identical to the Linux version. Platform independent. */
struct hid_device_info *devs, *cur_dev;
const char *path_to_open = NULL;
hid_device * handle = NULL;
/* register_global_error: global error is reset by hid_enumerate/hid_init */
devs = hid_enumerate(vendor_id, product_id);
if (devs == NULL) {
/* register_global_error: global error is already set by hid_enumerate */
return NULL;
}
cur_dev = devs;
while (cur_dev) {
if (cur_dev->vendor_id == vendor_id &&
cur_dev->product_id == product_id) {
if (serial_number) {
if (wcscmp(serial_number, cur_dev->serial_number) == 0) {
path_to_open = cur_dev->path;
break;
}
}
else {
path_to_open = cur_dev->path;
break;
}
}
cur_dev = cur_dev->next;
}
if (path_to_open) {
handle = hid_open_path(path_to_open);
} else {
register_global_error("Device with requested VID/PID/(SerialNumber) not found");
}
hid_free_enumeration(devs);
return handle;
}
static void hid_device_removal_callback(void *context, IOReturn result,
void *sender)
{
(void) result;
(void) sender;
/* Stop the Run Loop for this device. */
hid_device *d = (hid_device*) context;
d->disconnected = 1;
CFRunLoopStop(d->run_loop);
}
/* The Run Loop calls this function for each input report received.
This function puts the data into a linked list to be picked up by
hid_read(). */
static void hid_report_callback(void *context, IOReturn result, void *sender,
IOHIDReportType report_type, uint32_t report_id,
uint8_t *report, CFIndex report_length)
{
(void) result;
(void) sender;
(void) report_type;
(void) report_id;
struct input_report *rpt;
hid_device *dev = (hid_device*) context;
/* Make a new Input Report object */
rpt = (struct input_report*) calloc(1, sizeof(struct input_report));
rpt->data = (uint8_t*) calloc(1, report_length);
memcpy(rpt->data, report, report_length);
rpt->len = report_length;
rpt->next = NULL;
/* Lock this section */
pthread_mutex_lock(&dev->mutex);
/* Attach the new report object to the end of the list. */
if (dev->input_reports == NULL) {
/* The list is empty. Put it at the root. */
dev->input_reports = rpt;
}
else {
/* Find the end of the list and attach. */
struct input_report *cur = dev->input_reports;
int num_queued = 0;
while (cur->next != NULL) {
cur = cur->next;
num_queued++;
}
cur->next = rpt;
/* Pop one off if we've reached 30 in the queue. This
way we don't grow forever if the user never reads
anything from the device. */
if (num_queued > 30) {
return_data(dev, NULL, 0);
}
}
/* Signal a waiting thread that there is data. */
pthread_cond_signal(&dev->condition);
/* Unlock */
pthread_mutex_unlock(&dev->mutex);
}
/* This gets called when the read_thread's run loop gets signaled by
hid_close(), and serves to stop the read_thread's run loop. */
static void perform_signal_callback(void *context)
{
hid_device *dev = (hid_device*) context;
CFRunLoopStop(dev->run_loop); /*TODO: CFRunLoopGetCurrent()*/
}
static void *read_thread(void *param)
{
hid_device *dev = (hid_device*) param;
SInt32 code;
/* Move the device's run loop to this thread. */
IOHIDDeviceScheduleWithRunLoop(dev->device_handle, CFRunLoopGetCurrent(), dev->run_loop_mode);
/* Create the RunLoopSource which is used to signal the
event loop to stop when hid_close() is called. */
CFRunLoopSourceContext ctx;
memset(&ctx, 0, sizeof(ctx));
ctx.version = 0;
ctx.info = dev;
ctx.perform = &perform_signal_callback;
dev->source = CFRunLoopSourceCreate(kCFAllocatorDefault, 0/*order*/, &ctx);
CFRunLoopAddSource(CFRunLoopGetCurrent(), dev->source, dev->run_loop_mode);
/* Store off the Run Loop so it can be stopped from hid_close()
and on device disconnection. */
dev->run_loop = CFRunLoopGetCurrent();
/* Notify the main thread that the read thread is up and running. */
pthread_barrier_wait(&dev->barrier);
/* Run the Event Loop. CFRunLoopRunInMode() will dispatch HID input
reports into the hid_report_callback(). */
while (!dev->shutdown_thread && !dev->disconnected) {
code = CFRunLoopRunInMode(dev->run_loop_mode, 1000/*sec*/, FALSE);
/* Return if the device has been disconnected */
if (code == kCFRunLoopRunFinished || code == kCFRunLoopRunStopped) {
dev->disconnected = 1;
break;
}
/* Break if The Run Loop returns Finished or Stopped. */
if (code != kCFRunLoopRunTimedOut &&
code != kCFRunLoopRunHandledSource) {
/* There was some kind of error. Setting
shutdown seems to make sense, but
there may be something else more appropriate */
dev->shutdown_thread = 1;
break;
}
}
/* Now that the read thread is stopping, Wake any threads which are
waiting on data (in hid_read_timeout()). Do this under a mutex to
make sure that a thread which is about to go to sleep waiting on
the condition actually will go to sleep before the condition is
signaled. */
pthread_mutex_lock(&dev->mutex);
pthread_cond_broadcast(&dev->condition);
pthread_mutex_unlock(&dev->mutex);
/* Wait here until hid_close() is called and makes it past
the call to CFRunLoopWakeUp(). This thread still needs to
be valid when that function is called on the other thread. */
pthread_barrier_wait(&dev->shutdown_barrier);
return NULL;
}
/* \p path must be one of:
- in format 'DevSrvsID:<RegistryEntryID>' (as returned by hid_enumerate);
- a valid path to an IOHIDDevice in the IOService plane (as returned by IORegistryEntryGetPath,
e.g.: "IOService:/AppleACPIPlatformExpert/PCI0@0/AppleACPIPCI/EHC1@1D,7/AppleUSBEHCI/PLAYSTATION(R)3 Controller@fd120000/IOUSBInterface@0/IOUSBHIDDriver");
Second format is for compatibility with paths accepted by older versions of HIDAPI.
*/
static io_registry_entry_t hid_open_service_registry_from_path(const char *path)
{