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14#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
15
16#include <linux/module.h>
17#include <linux/slab.h>
18#include <linux/init.h>
19#include <linux/kernel.h>
20#include <linux/list.h>
21#include <linux/mm.h>
22#include <linux/spinlock.h>
23#include <asm/unaligned.h>
24#include <asm/byteorder.h>
25#include <linux/input.h>
26#include <linux/wait.h>
27#include <linux/vmalloc.h>
28#include <linux/sched.h>
29#include <linux/semaphore.h>
30
31#include <linux/hid.h>
32#include <linux/hiddev.h>
33#include <linux/hid-debug.h>
34#include <linux/hidraw.h>
35
36#include "hid-ids.h"
37
38
39
40
41
42#define DRIVER_DESC "HID core driver"
43
44int hid_debug = 0;
45module_param_named(debug, hid_debug, int, 0600);
46MODULE_PARM_DESC(debug, "toggle HID debugging messages");
47EXPORT_SYMBOL_GPL(hid_debug);
48
49static int hid_ignore_special_drivers = 0;
50module_param_named(ignore_special_drivers, hid_ignore_special_drivers, int, 0600);
51MODULE_PARM_DESC(ignore_special_drivers, "Ignore any special drivers and handle all devices by generic driver");
52
53
54
55
56
57struct hid_report *hid_register_report(struct hid_device *device,
58 unsigned int type, unsigned int id,
59 unsigned int application)
60{
61 struct hid_report_enum *report_enum = device->report_enum + type;
62 struct hid_report *report;
63
64 if (id >= HID_MAX_IDS)
65 return NULL;
66 if (report_enum->report_id_hash[id])
67 return report_enum->report_id_hash[id];
68
69 report = kzalloc(sizeof(struct hid_report), GFP_KERNEL);
70 if (!report)
71 return NULL;
72
73 if (id != 0)
74 report_enum->numbered = 1;
75
76 report->id = id;
77 report->type = type;
78 report->size = 0;
79 report->device = device;
80 report->application = application;
81 report_enum->report_id_hash[id] = report;
82
83 list_add_tail(&report->list, &report_enum->report_list);
84
85 return report;
86}
87EXPORT_SYMBOL_GPL(hid_register_report);
88
89
90
91
92
93static struct hid_field *hid_register_field(struct hid_report *report, unsigned usages, unsigned values)
94{
95 struct hid_field *field;
96
97 if (report->maxfield == HID_MAX_FIELDS) {
98 hid_err(report->device, "too many fields in report\n");
99 return NULL;
100 }
101
102 field = kzalloc((sizeof(struct hid_field) +
103 usages * sizeof(struct hid_usage) +
104 values * sizeof(unsigned)), GFP_KERNEL);
105 if (!field)
106 return NULL;
107
108 field->index = report->maxfield++;
109 report->field[field->index] = field;
110 field->usage = (struct hid_usage *)(field + 1);
111 field->value = (s32 *)(field->usage + usages);
112 field->report = report;
113
114 return field;
115}
116
117
118
119
120
121static int open_collection(struct hid_parser *parser, unsigned type)
122{
123 struct hid_collection *collection;
124 unsigned usage;
125 int collection_index;
126
127 usage = parser->local.usage[0];
128
129 if (parser->collection_stack_ptr == parser->collection_stack_size) {
130 unsigned int *collection_stack;
131 unsigned int new_size = parser->collection_stack_size +
132 HID_COLLECTION_STACK_SIZE;
133
134 collection_stack = krealloc(parser->collection_stack,
135 new_size * sizeof(unsigned int),
136 GFP_KERNEL);
137 if (!collection_stack)
138 return -ENOMEM;
139
140 parser->collection_stack = collection_stack;
141 parser->collection_stack_size = new_size;
142 }
143
144 if (parser->device->maxcollection == parser->device->collection_size) {
145 collection = kmalloc(
146 array3_size(sizeof(struct hid_collection),
147 parser->device->collection_size,
148 2),
149 GFP_KERNEL);
150 if (collection == NULL) {
151 hid_err(parser->device, "failed to reallocate collection array\n");
152 return -ENOMEM;
153 }
154 memcpy(collection, parser->device->collection,
155 sizeof(struct hid_collection) *
156 parser->device->collection_size);
157 memset(collection + parser->device->collection_size, 0,
158 sizeof(struct hid_collection) *
159 parser->device->collection_size);
160 kfree(parser->device->collection);
161 parser->device->collection = collection;
162 parser->device->collection_size *= 2;
163 }
164
165 parser->collection_stack[parser->collection_stack_ptr++] =
166 parser->device->maxcollection;
167
168 collection_index = parser->device->maxcollection++;
169 collection = parser->device->collection + collection_index;
170 collection->type = type;
171 collection->usage = usage;
172 collection->level = parser->collection_stack_ptr - 1;
173 collection->parent_idx = (collection->level == 0) ? -1 :
174 parser->collection_stack[collection->level - 1];
175
176 if (type == HID_COLLECTION_APPLICATION)
177 parser->device->maxapplication++;
178
179 return 0;
180}
181
182
183
184
185
186static int close_collection(struct hid_parser *parser)
187{
188 if (!parser->collection_stack_ptr) {
189 hid_err(parser->device, "collection stack underflow\n");
190 return -EINVAL;
191 }
192 parser->collection_stack_ptr--;
193 return 0;
194}
195
196
197
198
199
200
201static unsigned hid_lookup_collection(struct hid_parser *parser, unsigned type)
202{
203 struct hid_collection *collection = parser->device->collection;
204 int n;
205
206 for (n = parser->collection_stack_ptr - 1; n >= 0; n--) {
207 unsigned index = parser->collection_stack[n];
208 if (collection[index].type == type)
209 return collection[index].usage;
210 }
211 return 0;
212}
213
214
215
216
217
218static int hid_add_usage(struct hid_parser *parser, unsigned usage, u8 size)
219{
220 if (parser->local.usage_index >= HID_MAX_USAGES) {
221 hid_err(parser->device, "usage index exceeded\n");
222 return -1;
223 }
224 parser->local.usage[parser->local.usage_index] = usage;
225 parser->local.usage_size[parser->local.usage_index] = size;
226 parser->local.collection_index[parser->local.usage_index] =
227 parser->collection_stack_ptr ?
228 parser->collection_stack[parser->collection_stack_ptr - 1] : 0;
229 parser->local.usage_index++;
230 return 0;
231}
232
233
234
235
236
237static int hid_add_field(struct hid_parser *parser, unsigned report_type, unsigned flags)
238{
239 struct hid_report *report;
240 struct hid_field *field;
241 unsigned int usages;
242 unsigned int offset;
243 unsigned int i;
244 unsigned int application;
245
246 application = hid_lookup_collection(parser, HID_COLLECTION_APPLICATION);
247
248 report = hid_register_report(parser->device, report_type,
249 parser->global.report_id, application);
250 if (!report) {
251 hid_err(parser->device, "hid_register_report failed\n");
252 return -1;
253 }
254
255
256 if ((parser->global.logical_minimum < 0 &&
257 parser->global.logical_maximum <
258 parser->global.logical_minimum) ||
259 (parser->global.logical_minimum >= 0 &&
260 (__u32)parser->global.logical_maximum <
261 (__u32)parser->global.logical_minimum)) {
262 dbg_hid("logical range invalid 0x%x 0x%x\n",
263 parser->global.logical_minimum,
264 parser->global.logical_maximum);
265 return -1;
266 }
267
268 offset = report->size;
269 report->size += parser->global.report_size * parser->global.report_count;
270
271 if (!parser->local.usage_index)
272 return 0;
273
274 usages = max_t(unsigned, parser->local.usage_index,
275 parser->global.report_count);
276
277 field = hid_register_field(report, usages, parser->global.report_count);
278 if (!field)
279 return 0;
280
281 field->physical = hid_lookup_collection(parser, HID_COLLECTION_PHYSICAL);
282 field->logical = hid_lookup_collection(parser, HID_COLLECTION_LOGICAL);
283 field->application = application;
284
285 for (i = 0; i < usages; i++) {
286 unsigned j = i;
287
288 if (i >= parser->local.usage_index)
289 j = parser->local.usage_index - 1;
290 field->usage[i].hid = parser->local.usage[j];
291 field->usage[i].collection_index =
292 parser->local.collection_index[j];
293 field->usage[i].usage_index = i;
294 field->usage[i].resolution_multiplier = 1;
295 }
296
297 field->maxusage = usages;
298 field->flags = flags;
299 field->report_offset = offset;
300 field->report_type = report_type;
301 field->report_size = parser->global.report_size;
302 field->report_count = parser->global.report_count;
303 field->logical_minimum = parser->global.logical_minimum;
304 field->logical_maximum = parser->global.logical_maximum;
305 field->physical_minimum = parser->global.physical_minimum;
306 field->physical_maximum = parser->global.physical_maximum;
307 field->unit_exponent = parser->global.unit_exponent;
308 field->unit = parser->global.unit;
309
310 return 0;
311}
312
313
314
315
316
317static u32 item_udata(struct hid_item *item)
318{
319 switch (item->size) {
320 case 1: return item->data.u8;
321 case 2: return item->data.u16;
322 case 4: return item->data.u32;
323 }
324 return 0;
325}
326
327static s32 item_sdata(struct hid_item *item)
328{
329 switch (item->size) {
330 case 1: return item->data.s8;
331 case 2: return item->data.s16;
332 case 4: return item->data.s32;
333 }
334 return 0;
335}
336
337
338
339
340
341static int hid_parser_global(struct hid_parser *parser, struct hid_item *item)
342{
343 __s32 raw_value;
344 switch (item->tag) {
345 case HID_GLOBAL_ITEM_TAG_PUSH:
346
347 if (parser->global_stack_ptr == HID_GLOBAL_STACK_SIZE) {
348 hid_err(parser->device, "global environment stack overflow\n");
349 return -1;
350 }
351
352 memcpy(parser->global_stack + parser->global_stack_ptr++,
353 &parser->global, sizeof(struct hid_global));
354 return 0;
355
356 case HID_GLOBAL_ITEM_TAG_POP:
357
358 if (!parser->global_stack_ptr) {
359 hid_err(parser->device, "global environment stack underflow\n");
360 return -1;
361 }
362
363 memcpy(&parser->global, parser->global_stack +
364 --parser->global_stack_ptr, sizeof(struct hid_global));
365 return 0;
366
367 case HID_GLOBAL_ITEM_TAG_USAGE_PAGE:
368 parser->global.usage_page = item_udata(item);
369 return 0;
370
371 case HID_GLOBAL_ITEM_TAG_LOGICAL_MINIMUM:
372 parser->global.logical_minimum = item_sdata(item);
373 return 0;
374
375 case HID_GLOBAL_ITEM_TAG_LOGICAL_MAXIMUM:
376 if (parser->global.logical_minimum < 0)
377 parser->global.logical_maximum = item_sdata(item);
378 else
379 parser->global.logical_maximum = item_udata(item);
380 return 0;
381
382 case HID_GLOBAL_ITEM_TAG_PHYSICAL_MINIMUM:
383 parser->global.physical_minimum = item_sdata(item);
384 return 0;
385
386 case HID_GLOBAL_ITEM_TAG_PHYSICAL_MAXIMUM:
387 if (parser->global.physical_minimum < 0)
388 parser->global.physical_maximum = item_sdata(item);
389 else
390 parser->global.physical_maximum = item_udata(item);
391 return 0;
392
393 case HID_GLOBAL_ITEM_TAG_UNIT_EXPONENT:
394
395
396
397
398 raw_value = item_sdata(item);
399 if (!(raw_value & 0xfffffff0))
400 parser->global.unit_exponent = hid_snto32(raw_value, 4);
401 else
402 parser->global.unit_exponent = raw_value;
403 return 0;
404
405 case HID_GLOBAL_ITEM_TAG_UNIT:
406 parser->global.unit = item_udata(item);
407 return 0;
408
409 case HID_GLOBAL_ITEM_TAG_REPORT_SIZE:
410 parser->global.report_size = item_udata(item);
411 if (parser->global.report_size > 256) {
412 hid_err(parser->device, "invalid report_size %d\n",
413 parser->global.report_size);
414 return -1;
415 }
416 return 0;
417
418 case HID_GLOBAL_ITEM_TAG_REPORT_COUNT:
419 parser->global.report_count = item_udata(item);
420 if (parser->global.report_count > HID_MAX_USAGES) {
421 hid_err(parser->device, "invalid report_count %d\n",
422 parser->global.report_count);
423 return -1;
424 }
425 return 0;
426
427 case HID_GLOBAL_ITEM_TAG_REPORT_ID:
428 parser->global.report_id = item_udata(item);
429 if (parser->global.report_id == 0 ||
430 parser->global.report_id >= HID_MAX_IDS) {
431 hid_err(parser->device, "report_id %u is invalid\n",
432 parser->global.report_id);
433 return -1;
434 }
435 return 0;
436
437 default:
438 hid_err(parser->device, "unknown global tag 0x%x\n", item->tag);
439 return -1;
440 }
441}
442
443
444
445
446
447static int hid_parser_local(struct hid_parser *parser, struct hid_item *item)
448{
449 __u32 data;
450 unsigned n;
451 __u32 count;
452
453 data = item_udata(item);
454
455 switch (item->tag) {
456 case HID_LOCAL_ITEM_TAG_DELIMITER:
457
458 if (data) {
459
460
461
462
463
464
465 if (parser->local.delimiter_depth != 0) {
466 hid_err(parser->device, "nested delimiters\n");
467 return -1;
468 }
469 parser->local.delimiter_depth++;
470 parser->local.delimiter_branch++;
471 } else {
472 if (parser->local.delimiter_depth < 1) {
473 hid_err(parser->device, "bogus close delimiter\n");
474 return -1;
475 }
476 parser->local.delimiter_depth--;
477 }
478 return 0;
479
480 case HID_LOCAL_ITEM_TAG_USAGE:
481
482 if (parser->local.delimiter_branch > 1) {
483 dbg_hid("alternative usage ignored\n");
484 return 0;
485 }
486
487 return hid_add_usage(parser, data, item->size);
488
489 case HID_LOCAL_ITEM_TAG_USAGE_MINIMUM:
490
491 if (parser->local.delimiter_branch > 1) {
492 dbg_hid("alternative usage ignored\n");
493 return 0;
494 }
495
496 parser->local.usage_minimum = data;
497 return 0;
498
499 case HID_LOCAL_ITEM_TAG_USAGE_MAXIMUM:
500
501 if (parser->local.delimiter_branch > 1) {
502 dbg_hid("alternative usage ignored\n");
503 return 0;
504 }
505
506 count = data - parser->local.usage_minimum;
507 if (count + parser->local.usage_index >= HID_MAX_USAGES) {
508
509
510
511
512 if (dev_name(&parser->device->dev))
513 hid_warn(parser->device,
514 "ignoring exceeding usage max\n");
515 data = HID_MAX_USAGES - parser->local.usage_index +
516 parser->local.usage_minimum - 1;
517 if (data <= 0) {
518 hid_err(parser->device,
519 "no more usage index available\n");
520 return -1;
521 }
522 }
523
524 for (n = parser->local.usage_minimum; n <= data; n++)
525 if (hid_add_usage(parser, n, item->size)) {
526 dbg_hid("hid_add_usage failed\n");
527 return -1;
528 }
529 return 0;
530
531 default:
532
533 dbg_hid("unknown local item tag 0x%x\n", item->tag);
534 return 0;
535 }
536 return 0;
537}
538
539
540
541
542
543
544
545
546static void hid_concatenate_usage_page(struct hid_parser *parser)
547{
548 int i;
549
550 for (i = 0; i < parser->local.usage_index; i++)
551 if (parser->local.usage_size[i] <= 2)
552 parser->local.usage[i] += parser->global.usage_page << 16;
553}
554
555
556
557
558
559static int hid_parser_main(struct hid_parser *parser, struct hid_item *item)
560{
561 __u32 data;
562 int ret;
563
564 hid_concatenate_usage_page(parser);
565
566 data = item_udata(item);
567
568 switch (item->tag) {
569 case HID_MAIN_ITEM_TAG_BEGIN_COLLECTION:
570 ret = open_collection(parser, data & 0xff);
571 break;
572 case HID_MAIN_ITEM_TAG_END_COLLECTION:
573 ret = close_collection(parser);
574 break;
575 case HID_MAIN_ITEM_TAG_INPUT:
576 ret = hid_add_field(parser, HID_INPUT_REPORT, data);
577 break;
578 case HID_MAIN_ITEM_TAG_OUTPUT:
579 ret = hid_add_field(parser, HID_OUTPUT_REPORT, data);
580 break;
581 case HID_MAIN_ITEM_TAG_FEATURE:
582 ret = hid_add_field(parser, HID_FEATURE_REPORT, data);
583 break;
584 default:
585 hid_warn(parser->device, "unknown main item tag 0x%x\n", item->tag);
586 ret = 0;
587 }
588
589 memset(&parser->local, 0, sizeof(parser->local));
590
591 return ret;
592}
593
594
595
596
597
598static int hid_parser_reserved(struct hid_parser *parser, struct hid_item *item)
599{
600 dbg_hid("reserved item type, tag 0x%x\n", item->tag);
601 return 0;
602}
603
604
605
606
607
608
609
610static void hid_free_report(struct hid_report *report)
611{
612 unsigned n;
613
614 for (n = 0; n < report->maxfield; n++)
615 kfree(report->field[n]);
616 kfree(report);
617}
618
619
620
621
622
623static void hid_close_report(struct hid_device *device)
624{
625 unsigned i, j;
626
627 for (i = 0; i < HID_REPORT_TYPES; i++) {
628 struct hid_report_enum *report_enum = device->report_enum + i;
629
630 for (j = 0; j < HID_MAX_IDS; j++) {
631 struct hid_report *report = report_enum->report_id_hash[j];
632 if (report)
633 hid_free_report(report);
634 }
635 memset(report_enum, 0, sizeof(*report_enum));
636 INIT_LIST_HEAD(&report_enum->report_list);
637 }
638
639 kfree(device->rdesc);
640 device->rdesc = NULL;
641 device->rsize = 0;
642
643 kfree(device->collection);
644 device->collection = NULL;
645 device->collection_size = 0;
646 device->maxcollection = 0;
647 device->maxapplication = 0;
648
649 device->status &= ~HID_STAT_PARSED;
650}
651
652
653
654
655
656static void hid_device_release(struct device *dev)
657{
658 struct hid_device *hid = to_hid_device(dev);
659
660 hid_close_report(hid);
661 kfree(hid->dev_rdesc);
662 kfree(hid);
663}
664
665
666
667
668
669
670static u8 *fetch_item(__u8 *start, __u8 *end, struct hid_item *item)
671{
672 u8 b;
673
674 if ((end - start) <= 0)
675 return NULL;
676
677 b = *start++;
678
679 item->type = (b >> 2) & 3;
680 item->tag = (b >> 4) & 15;
681
682 if (item->tag == HID_ITEM_TAG_LONG) {
683
684 item->format = HID_ITEM_FORMAT_LONG;
685
686 if ((end - start) < 2)
687 return NULL;
688
689 item->size = *start++;
690 item->tag = *start++;
691
692 if ((end - start) < item->size)
693 return NULL;
694
695 item->data.longdata = start;
696 start += item->size;
697 return start;
698 }
699
700 item->format = HID_ITEM_FORMAT_SHORT;
701 item->size = b & 3;
702
703 switch (item->size) {
704 case 0:
705 return start;
706
707 case 1:
708 if ((end - start) < 1)
709 return NULL;
710 item->data.u8 = *start++;
711 return start;
712
713 case 2:
714 if ((end - start) < 2)
715 return NULL;
716 item->data.u16 = get_unaligned_le16(start);
717 start = (__u8 *)((__le16 *)start + 1);
718 return start;
719
720 case 3:
721 item->size++;
722 if ((end - start) < 4)
723 return NULL;
724 item->data.u32 = get_unaligned_le32(start);
725 start = (__u8 *)((__le32 *)start + 1);
726 return start;
727 }
728
729 return NULL;
730}
731
732static void hid_scan_input_usage(struct hid_parser *parser, u32 usage)
733{
734 struct hid_device *hid = parser->device;
735
736 if (usage == HID_DG_CONTACTID)
737 hid->group = HID_GROUP_MULTITOUCH;
738}
739
740static void hid_scan_feature_usage(struct hid_parser *parser, u32 usage)
741{
742 if (usage == 0xff0000c5 && parser->global.report_count == 256 &&
743 parser->global.report_size == 8)
744 parser->scan_flags |= HID_SCAN_FLAG_MT_WIN_8;
745}
746
747static void hid_scan_collection(struct hid_parser *parser, unsigned type)
748{
749 struct hid_device *hid = parser->device;
750 int i;
751
752 if (((parser->global.usage_page << 16) == HID_UP_SENSOR) &&
753 type == HID_COLLECTION_PHYSICAL)
754 hid->group = HID_GROUP_SENSOR_HUB;
755
756 if (hid->vendor == USB_VENDOR_ID_MICROSOFT &&
757 hid->product == USB_DEVICE_ID_MS_POWER_COVER &&
758 hid->group == HID_GROUP_MULTITOUCH)
759 hid->group = HID_GROUP_GENERIC;
760
761 if ((parser->global.usage_page << 16) == HID_UP_GENDESK)
762 for (i = 0; i < parser->local.usage_index; i++)
763 if (parser->local.usage[i] == HID_GD_POINTER)
764 parser->scan_flags |= HID_SCAN_FLAG_GD_POINTER;
765
766 if ((parser->global.usage_page << 16) >= HID_UP_MSVENDOR)
767 parser->scan_flags |= HID_SCAN_FLAG_VENDOR_SPECIFIC;
768}
769
770static int hid_scan_main(struct hid_parser *parser, struct hid_item *item)
771{
772 __u32 data;
773 int i;
774
775 hid_concatenate_usage_page(parser);
776
777 data = item_udata(item);
778
779 switch (item->tag) {
780 case HID_MAIN_ITEM_TAG_BEGIN_COLLECTION:
781 hid_scan_collection(parser, data & 0xff);
782 break;
783 case HID_MAIN_ITEM_TAG_END_COLLECTION:
784 break;
785 case HID_MAIN_ITEM_TAG_INPUT:
786
787 if (data & HID_MAIN_ITEM_CONSTANT)
788 break;
789 for (i = 0; i < parser->local.usage_index; i++)
790 hid_scan_input_usage(parser, parser->local.usage[i]);
791 break;
792 case HID_MAIN_ITEM_TAG_OUTPUT:
793 break;
794 case HID_MAIN_ITEM_TAG_FEATURE:
795 for (i = 0; i < parser->local.usage_index; i++)
796 hid_scan_feature_usage(parser, parser->local.usage[i]);
797 break;
798 }
799
800
801 memset(&parser->local, 0, sizeof(parser->local));
802
803 return 0;
804}
805
806
807
808
809
810
811static int hid_scan_report(struct hid_device *hid)
812{
813 struct hid_parser *parser;
814 struct hid_item item;
815 __u8 *start = hid->dev_rdesc;
816 __u8 *end = start + hid->dev_rsize;
817 static int (*dispatch_type[])(struct hid_parser *parser,
818 struct hid_item *item) = {
819 hid_scan_main,
820 hid_parser_global,
821 hid_parser_local,
822 hid_parser_reserved
823 };
824
825 parser = vzalloc(sizeof(struct hid_parser));
826 if (!parser)
827 return -ENOMEM;
828
829 parser->device = hid;
830 hid->group = HID_GROUP_GENERIC;
831
832
833
834
835
836
837 while ((start = fetch_item(start, end, &item)) != NULL)
838 dispatch_type[item.type](parser, &item);
839
840
841
842
843 if ((parser->scan_flags & HID_SCAN_FLAG_MT_WIN_8) &&
844 (hid->group == HID_GROUP_MULTITOUCH))
845 hid->group = HID_GROUP_MULTITOUCH_WIN_8;
846
847
848
849
850 switch (hid->vendor) {
851 case USB_VENDOR_ID_WACOM:
852 hid->group = HID_GROUP_WACOM;
853 break;
854 case USB_VENDOR_ID_SYNAPTICS:
855 if (hid->group == HID_GROUP_GENERIC)
856 if ((parser->scan_flags & HID_SCAN_FLAG_VENDOR_SPECIFIC)
857 && (parser->scan_flags & HID_SCAN_FLAG_GD_POINTER))
858
859
860
861
862 hid->group = HID_GROUP_RMI;
863 break;
864 }
865
866 kfree(parser->collection_stack);
867 vfree(parser);
868 return 0;
869}
870
871
872
873
874
875
876
877
878
879
880
881int hid_parse_report(struct hid_device *hid, __u8 *start, unsigned size)
882{
883 hid->dev_rdesc = kmemdup(start, size, GFP_KERNEL);
884 if (!hid->dev_rdesc)
885 return -ENOMEM;
886 hid->dev_rsize = size;
887 return 0;
888}
889EXPORT_SYMBOL_GPL(hid_parse_report);
890
891static const char * const hid_report_names[] = {
892 "HID_INPUT_REPORT",
893 "HID_OUTPUT_REPORT",
894 "HID_FEATURE_REPORT",
895};
896
897
898
899
900
901
902
903
904
905
906
907
908struct hid_report *hid_validate_values(struct hid_device *hid,
909 unsigned int type, unsigned int id,
910 unsigned int field_index,
911 unsigned int report_counts)
912{
913 struct hid_report *report;
914
915 if (type > HID_FEATURE_REPORT) {
916 hid_err(hid, "invalid HID report type %u\n", type);
917 return NULL;
918 }
919
920 if (id >= HID_MAX_IDS) {
921 hid_err(hid, "invalid HID report id %u\n", id);
922 return NULL;
923 }
924
925
926
927
928
929
930 if (id == 0) {
931
932
933
934
935 report = list_entry(
936 hid->report_enum[type].report_list.next,
937 struct hid_report, list);
938 } else {
939 report = hid->report_enum[type].report_id_hash[id];
940 }
941 if (!report) {
942 hid_err(hid, "missing %s %u\n", hid_report_names[type], id);
943 return NULL;
944 }
945 if (report->maxfield <= field_index) {
946 hid_err(hid, "not enough fields in %s %u\n",
947 hid_report_names[type], id);
948 return NULL;
949 }
950 if (report->field[field_index]->report_count < report_counts) {
951 hid_err(hid, "not enough values in %s %u field %u\n",
952 hid_report_names[type], id, field_index);
953 return NULL;
954 }
955 return report;
956}
957EXPORT_SYMBOL_GPL(hid_validate_values);
958
959static int hid_calculate_multiplier(struct hid_device *hid,
960 struct hid_field *multiplier)
961{
962 int m;
963 __s32 v = *multiplier->value;
964 __s32 lmin = multiplier->logical_minimum;
965 __s32 lmax = multiplier->logical_maximum;
966 __s32 pmin = multiplier->physical_minimum;
967 __s32 pmax = multiplier->physical_maximum;
968
969
970
971
972
973
974
975
976 if (lmax - lmin == 0)
977 return 1;
978
979
980
981
982 m = ((v - lmin)/(lmax - lmin) * (pmax - pmin) + pmin);
983 if (unlikely(multiplier->unit_exponent != 0)) {
984 hid_warn(hid,
985 "unsupported Resolution Multiplier unit exponent %d\n",
986 multiplier->unit_exponent);
987 }
988
989
990 if (unlikely(m == 0 || m > 255 || m < -255)) {
991 hid_warn(hid, "unsupported Resolution Multiplier %d\n", m);
992 m = 1;
993 }
994
995 return m;
996}
997
998static void hid_apply_multiplier_to_field(struct hid_device *hid,
999 struct hid_field *field,
1000 struct hid_collection *multiplier_collection,
1001 int effective_multiplier)
1002{
1003 struct hid_collection *collection;
1004 struct hid_usage *usage;
1005 int i;
1006
1007
1008
1009
1010
1011
1012
1013 for (i = 0; i < field->maxusage; i++) {
1014 usage = &field->usage[i];
1015
1016 collection = &hid->collection[usage->collection_index];
1017 while (collection->parent_idx != -1 &&
1018 collection != multiplier_collection)
1019 collection = &hid->collection[collection->parent_idx];
1020
1021 if (collection->parent_idx != -1 ||
1022 multiplier_collection == NULL)
1023 usage->resolution_multiplier = effective_multiplier;
1024
1025 }
1026}
1027
1028static void hid_apply_multiplier(struct hid_device *hid,
1029 struct hid_field *multiplier)
1030{
1031 struct hid_report_enum *rep_enum;
1032 struct hid_report *rep;
1033 struct hid_field *field;
1034 struct hid_collection *multiplier_collection;
1035 int effective_multiplier;
1036 int i;
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056 multiplier_collection = &hid->collection[multiplier->usage->collection_index];
1057 while (multiplier_collection->parent_idx != -1 &&
1058 multiplier_collection->type != HID_COLLECTION_LOGICAL)
1059 multiplier_collection = &hid->collection[multiplier_collection->parent_idx];
1060
1061 effective_multiplier = hid_calculate_multiplier(hid, multiplier);
1062
1063 rep_enum = &hid->report_enum[HID_INPUT_REPORT];
1064 list_for_each_entry(rep, &rep_enum->report_list, list) {
1065 for (i = 0; i < rep->maxfield; i++) {
1066 field = rep->field[i];
1067 hid_apply_multiplier_to_field(hid, field,
1068 multiplier_collection,
1069 effective_multiplier);
1070 }
1071 }
1072}
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097void hid_setup_resolution_multiplier(struct hid_device *hid)
1098{
1099 struct hid_report_enum *rep_enum;
1100 struct hid_report *rep;
1101 struct hid_usage *usage;
1102 int i, j;
1103
1104 rep_enum = &hid->report_enum[HID_FEATURE_REPORT];
1105 list_for_each_entry(rep, &rep_enum->report_list, list) {
1106 for (i = 0; i < rep->maxfield; i++) {
1107
1108 if (rep->field[i]->report_count < 1)
1109 continue;
1110
1111 for (j = 0; j < rep->field[i]->maxusage; j++) {
1112 usage = &rep->field[i]->usage[j];
1113 if (usage->hid == HID_GD_RESOLUTION_MULTIPLIER)
1114 hid_apply_multiplier(hid,
1115 rep->field[i]);
1116 }
1117 }
1118 }
1119}
1120EXPORT_SYMBOL_GPL(hid_setup_resolution_multiplier);
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134int hid_open_report(struct hid_device *device)
1135{
1136 struct hid_parser *parser;
1137 struct hid_item item;
1138 unsigned int size;
1139 __u8 *start;
1140 __u8 *buf;
1141 __u8 *end;
1142 int ret;
1143 static int (*dispatch_type[])(struct hid_parser *parser,
1144 struct hid_item *item) = {
1145 hid_parser_main,
1146 hid_parser_global,
1147 hid_parser_local,
1148 hid_parser_reserved
1149 };
1150
1151 if (WARN_ON(device->status & HID_STAT_PARSED))
1152 return -EBUSY;
1153
1154 start = device->dev_rdesc;
1155 if (WARN_ON(!start))
1156 return -ENODEV;
1157 size = device->dev_rsize;
1158
1159 buf = kmemdup(start, size, GFP_KERNEL);
1160 if (buf == NULL)
1161 return -ENOMEM;
1162
1163 if (device->driver->report_fixup)
1164 start = device->driver->report_fixup(device, buf, &size);
1165 else
1166 start = buf;
1167
1168 start = kmemdup(start, size, GFP_KERNEL);
1169 kfree(buf);
1170 if (start == NULL)
1171 return -ENOMEM;
1172
1173 device->rdesc = start;
1174 device->rsize = size;
1175
1176 parser = vzalloc(sizeof(struct hid_parser));
1177 if (!parser) {
1178 ret = -ENOMEM;
1179 goto alloc_err;
1180 }
1181
1182 parser->device = device;
1183
1184 end = start + size;
1185
1186 device->collection = kcalloc(HID_DEFAULT_NUM_COLLECTIONS,
1187 sizeof(struct hid_collection), GFP_KERNEL);
1188 if (!device->collection) {
1189 ret = -ENOMEM;
1190 goto err;
1191 }
1192 device->collection_size = HID_DEFAULT_NUM_COLLECTIONS;
1193
1194 ret = -EINVAL;
1195 while ((start = fetch_item(start, end, &item)) != NULL) {
1196
1197 if (item.format != HID_ITEM_FORMAT_SHORT) {
1198 hid_err(device, "unexpected long global item\n");
1199 goto err;
1200 }
1201
1202 if (dispatch_type[item.type](parser, &item)) {
1203 hid_err(device, "item %u %u %u %u parsing failed\n",
1204 item.format, (unsigned)item.size,
1205 (unsigned)item.type, (unsigned)item.tag);
1206 goto err;
1207 }
1208
1209 if (start == end) {
1210 if (parser->collection_stack_ptr) {
1211 hid_err(device, "unbalanced collection at end of report description\n");
1212 goto err;
1213 }
1214 if (parser->local.delimiter_depth) {
1215 hid_err(device, "unbalanced delimiter at end of report description\n");
1216 goto err;
1217 }
1218
1219
1220
1221
1222
1223 hid_setup_resolution_multiplier(device);
1224
1225 kfree(parser->collection_stack);
1226 vfree(parser);
1227 device->status |= HID_STAT_PARSED;
1228
1229 return 0;
1230 }
1231 }
1232
1233 hid_err(device, "item fetching failed at offset %d\n", (int)(end - start));
1234err:
1235 kfree(parser->collection_stack);
1236alloc_err:
1237 vfree(parser);
1238 hid_close_report(device);
1239 return ret;
1240}
1241EXPORT_SYMBOL_GPL(hid_open_report);
1242
1243
1244
1245
1246
1247
1248
1249static s32 snto32(__u32 value, unsigned n)
1250{
1251 switch (n) {
1252 case 8: return ((__s8)value);
1253 case 16: return ((__s16)value);
1254 case 32: return ((__s32)value);
1255 }
1256 return value & (1 << (n - 1)) ? value | (~0U << n) : value;
1257}
1258
1259s32 hid_snto32(__u32 value, unsigned n)
1260{
1261 return snto32(value, n);
1262}
1263EXPORT_SYMBOL_GPL(hid_snto32);
1264
1265
1266
1267
1268
1269static u32 s32ton(__s32 value, unsigned n)
1270{
1271 s32 a = value >> (n - 1);
1272 if (a && a != -1)
1273 return value < 0 ? 1 << (n - 1) : (1 << (n - 1)) - 1;
1274 return value & ((1 << n) - 1);
1275}
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289static u32 __extract(u8 *report, unsigned offset, int n)
1290{
1291 unsigned int idx = offset / 8;
1292 unsigned int bit_nr = 0;
1293 unsigned int bit_shift = offset % 8;
1294 int bits_to_copy = 8 - bit_shift;
1295 u32 value = 0;
1296 u32 mask = n < 32 ? (1U << n) - 1 : ~0U;
1297
1298 while (n > 0) {
1299 value |= ((u32)report[idx] >> bit_shift) << bit_nr;
1300 n -= bits_to_copy;
1301 bit_nr += bits_to_copy;
1302 bits_to_copy = 8;
1303 bit_shift = 0;
1304 idx++;
1305 }
1306
1307 return value & mask;
1308}
1309
1310u32 hid_field_extract(const struct hid_device *hid, u8 *report,
1311 unsigned offset, unsigned n)
1312{
1313 if (n > 32) {
1314 hid_warn(hid, "hid_field_extract() called with n (%d) > 32! (%s)\n",
1315 n, current->comm);
1316 n = 32;
1317 }
1318
1319 return __extract(report, offset, n);
1320}
1321EXPORT_SYMBOL_GPL(hid_field_extract);
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332static void __implement(u8 *report, unsigned offset, int n, u32 value)
1333{
1334 unsigned int idx = offset / 8;
1335 unsigned int bit_shift = offset % 8;
1336 int bits_to_set = 8 - bit_shift;
1337
1338 while (n - bits_to_set >= 0) {
1339 report[idx] &= ~(0xff << bit_shift);
1340 report[idx] |= value << bit_shift;
1341 value >>= bits_to_set;
1342 n -= bits_to_set;
1343 bits_to_set = 8;
1344 bit_shift = 0;
1345 idx++;
1346 }
1347
1348
1349 if (n) {
1350 u8 bit_mask = ((1U << n) - 1);
1351 report[idx] &= ~(bit_mask << bit_shift);
1352 report[idx] |= value << bit_shift;
1353 }
1354}
1355
1356static void implement(const struct hid_device *hid, u8 *report,
1357 unsigned offset, unsigned n, u32 value)
1358{
1359 if (unlikely(n > 32)) {
1360 hid_warn(hid, "%s() called with n (%d) > 32! (%s)\n",
1361 __func__, n, current->comm);
1362 n = 32;
1363 } else if (n < 32) {
1364 u32 m = (1U << n) - 1;
1365
1366 if (unlikely(value > m)) {
1367 hid_warn(hid,
1368 "%s() called with too large value %d (n: %d)! (%s)\n",
1369 __func__, value, n, current->comm);
1370 WARN_ON(1);
1371 value &= m;
1372 }
1373 }
1374
1375 __implement(report, offset, n, value);
1376}
1377
1378
1379
1380
1381
1382static int search(__s32 *array, __s32 value, unsigned n)
1383{
1384 while (n--) {
1385 if (*array++ == value)
1386 return 0;
1387 }
1388 return -1;
1389}
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399static int hid_match_report(struct hid_device *hid, struct hid_report *report)
1400{
1401 const struct hid_report_id *id = hid->driver->report_table;
1402
1403 if (!id)
1404 return 1;
1405
1406 for (; id->report_type != HID_TERMINATOR; id++)
1407 if (id->report_type == HID_ANY_ID ||
1408 id->report_type == report->type)
1409 return 1;
1410 return 0;
1411}
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422static int hid_match_usage(struct hid_device *hid, struct hid_usage *usage)
1423{
1424 const struct hid_usage_id *id = hid->driver->usage_table;
1425
1426 if (!id)
1427 return 1;
1428
1429 for (; id->usage_type != HID_ANY_ID - 1; id++)
1430 if ((id->usage_hid == HID_ANY_ID ||
1431 id->usage_hid == usage->hid) &&
1432 (id->usage_type == HID_ANY_ID ||
1433 id->usage_type == usage->type) &&
1434 (id->usage_code == HID_ANY_ID ||
1435 id->usage_code == usage->code))
1436 return 1;
1437 return 0;
1438}
1439
1440static void hid_process_event(struct hid_device *hid, struct hid_field *field,
1441 struct hid_usage *usage, __s32 value, int interrupt)
1442{
1443 struct hid_driver *hdrv = hid->driver;
1444 int ret;
1445
1446 if (!list_empty(&hid->debug_list))
1447 hid_dump_input(hid, usage, value);
1448
1449 if (hdrv && hdrv->event && hid_match_usage(hid, usage)) {
1450 ret = hdrv->event(hid, field, usage, value);
1451 if (ret != 0) {
1452 if (ret < 0)
1453 hid_err(hid, "%s's event failed with %d\n",
1454 hdrv->name, ret);
1455 return;
1456 }
1457 }
1458
1459 if (hid->claimed & HID_CLAIMED_INPUT)
1460 hidinput_hid_event(hid, field, usage, value);
1461 if (hid->claimed & HID_CLAIMED_HIDDEV && interrupt && hid->hiddev_hid_event)
1462 hid->hiddev_hid_event(hid, field, usage, value);
1463}
1464
1465
1466
1467
1468
1469
1470
1471static void hid_input_field(struct hid_device *hid, struct hid_field *field,
1472 __u8 *data, int interrupt)
1473{
1474 unsigned n;
1475 unsigned count = field->report_count;
1476 unsigned offset = field->report_offset;
1477 unsigned size = field->report_size;
1478 __s32 min = field->logical_minimum;
1479 __s32 max = field->logical_maximum;
1480 __s32 *value;
1481
1482 value = kmalloc_array(count, sizeof(__s32), GFP_ATOMIC);
1483 if (!value)
1484 return;
1485
1486 for (n = 0; n < count; n++) {
1487
1488 value[n] = min < 0 ?
1489 snto32(hid_field_extract(hid, data, offset + n * size,
1490 size), size) :
1491 hid_field_extract(hid, data, offset + n * size, size);
1492
1493
1494 if (!(field->flags & HID_MAIN_ITEM_VARIABLE) &&
1495 value[n] >= min && value[n] <= max &&
1496 value[n] - min < field->maxusage &&
1497 field->usage[value[n] - min].hid == HID_UP_KEYBOARD + 1)
1498 goto exit;
1499 }
1500
1501 for (n = 0; n < count; n++) {
1502
1503 if (HID_MAIN_ITEM_VARIABLE & field->flags) {
1504 hid_process_event(hid, field, &field->usage[n], value[n], interrupt);
1505 continue;
1506 }
1507
1508 if (field->value[n] >= min && field->value[n] <= max
1509 && field->value[n] - min < field->maxusage
1510 && field->usage[field->value[n] - min].hid
1511 && search(value, field->value[n], count))
1512 hid_process_event(hid, field, &field->usage[field->value[n] - min], 0, interrupt);
1513
1514 if (value[n] >= min && value[n] <= max
1515 && value[n] - min < field->maxusage
1516 && field->usage[value[n] - min].hid
1517 && search(field->value, value[n], count))
1518 hid_process_event(hid, field, &field->usage[value[n] - min], 1, interrupt);
1519 }
1520
1521 memcpy(field->value, value, count * sizeof(__s32));
1522exit:
1523 kfree(value);
1524}
1525
1526
1527
1528
1529
1530static void hid_output_field(const struct hid_device *hid,
1531 struct hid_field *field, __u8 *data)
1532{
1533 unsigned count = field->report_count;
1534 unsigned offset = field->report_offset;
1535 unsigned size = field->report_size;
1536 unsigned n;
1537
1538 for (n = 0; n < count; n++) {
1539 if (field->logical_minimum < 0)
1540 implement(hid, data, offset + n * size, size,
1541 s32ton(field->value[n], size));
1542 else
1543 implement(hid, data, offset + n * size, size,
1544 field->value[n]);
1545 }
1546}
1547
1548
1549
1550
1551
1552
1553void hid_output_report(struct hid_report *report, __u8 *data)
1554{
1555 unsigned n;
1556
1557 if (report->id > 0)
1558 *data++ = report->id;
1559
1560 memset(data, 0, ((report->size - 1) >> 3) + 1);
1561 for (n = 0; n < report->maxfield; n++)
1562 hid_output_field(report->device, report->field[n], data);
1563}
1564EXPORT_SYMBOL_GPL(hid_output_report);
1565
1566
1567
1568
1569u8 *hid_alloc_report_buf(struct hid_report *report, gfp_t flags)
1570{
1571
1572
1573
1574
1575
1576 u32 len = hid_report_len(report) + 7;
1577
1578 return kmalloc(len, flags);
1579}
1580EXPORT_SYMBOL_GPL(hid_alloc_report_buf);
1581
1582
1583
1584
1585
1586
1587
1588int hid_set_field(struct hid_field *field, unsigned offset, __s32 value)
1589{
1590 unsigned size;
1591
1592 if (!field)
1593 return -1;
1594
1595 size = field->report_size;
1596
1597 hid_dump_input(field->report->device, field->usage + offset, value);
1598
1599 if (offset >= field->report_count) {
1600 hid_err(field->report->device, "offset (%d) exceeds report_count (%d)\n",
1601 offset, field->report_count);
1602 return -1;
1603 }
1604 if (field->logical_minimum < 0) {
1605 if (value != snto32(s32ton(value, size), size)) {
1606 hid_err(field->report->device, "value %d is out of range\n", value);
1607 return -1;
1608 }
1609 }
1610 field->value[offset] = value;
1611 return 0;
1612}
1613EXPORT_SYMBOL_GPL(hid_set_field);
1614
1615static struct hid_report *hid_get_report(struct hid_report_enum *report_enum,
1616 const u8 *data)
1617{
1618 struct hid_report *report;
1619 unsigned int n = 0;
1620
1621
1622 if (report_enum->numbered)
1623 n = *data;
1624
1625 report = report_enum->report_id_hash[n];
1626 if (report == NULL)
1627 dbg_hid("undefined report_id %u received\n", n);
1628
1629 return report;
1630}
1631
1632
1633
1634
1635
1636int __hid_request(struct hid_device *hid, struct hid_report *report,
1637 int reqtype)
1638{
1639 char *buf;
1640 int ret;
1641 u32 len;
1642
1643 buf = hid_alloc_report_buf(report, GFP_KERNEL);
1644 if (!buf)
1645 return -ENOMEM;
1646
1647 len = hid_report_len(report);
1648
1649 if (reqtype == HID_REQ_SET_REPORT)
1650 hid_output_report(report, buf);
1651
1652 ret = hid->ll_driver->raw_request(hid, report->id, buf, len,
1653 report->type, reqtype);
1654 if (ret < 0) {
1655 dbg_hid("unable to complete request: %d\n", ret);
1656 goto out;
1657 }
1658
1659 if (reqtype == HID_REQ_GET_REPORT)
1660 hid_input_report(hid, report->type, buf, ret, 0);
1661
1662 ret = 0;
1663
1664out:
1665 kfree(buf);
1666 return ret;
1667}
1668EXPORT_SYMBOL_GPL(__hid_request);
1669
1670int hid_report_raw_event(struct hid_device *hid, int type, u8 *data, u32 size,
1671 int interrupt)
1672{
1673 struct hid_report_enum *report_enum = hid->report_enum + type;
1674 struct hid_report *report;
1675 struct hid_driver *hdrv;
1676 unsigned int a;
1677 u32 rsize, csize = size;
1678 u8 *cdata = data;
1679 int ret = 0;
1680
1681 report = hid_get_report(report_enum, data);
1682 if (!report)
1683 goto out;
1684
1685 if (report_enum->numbered) {
1686 cdata++;
1687 csize--;
1688 }
1689
1690 rsize = ((report->size - 1) >> 3) + 1;
1691
1692 if (rsize > HID_MAX_BUFFER_SIZE)
1693 rsize = HID_MAX_BUFFER_SIZE;
1694
1695 if (csize < rsize) {
1696 dbg_hid("report %d is too short, (%d < %d)\n", report->id,
1697 csize, rsize);
1698 memset(cdata + csize, 0, rsize - csize);
1699 }
1700
1701 if ((hid->claimed & HID_CLAIMED_HIDDEV) && hid->hiddev_report_event)
1702 hid->hiddev_report_event(hid, report);
1703 if (hid->claimed & HID_CLAIMED_HIDRAW) {
1704 ret = hidraw_report_event(hid, data, size);
1705 if (ret)
1706 goto out;
1707 }
1708
1709 if (hid->claimed != HID_CLAIMED_HIDRAW && report->maxfield) {
1710 for (a = 0; a < report->maxfield; a++)
1711 hid_input_field(hid, report->field[a], cdata, interrupt);
1712 hdrv = hid->driver;
1713 if (hdrv && hdrv->report)
1714 hdrv->report(hid, report);
1715 }
1716
1717 if (hid->claimed & HID_CLAIMED_INPUT)
1718 hidinput_report_event(hid, report);
1719out:
1720 return ret;
1721}
1722EXPORT_SYMBOL_GPL(hid_report_raw_event);
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735int hid_input_report(struct hid_device *hid, int type, u8 *data, u32 size, int interrupt)
1736{
1737 struct hid_report_enum *report_enum;
1738 struct hid_driver *hdrv;
1739 struct hid_report *report;
1740 int ret = 0;
1741
1742 if (!hid)
1743 return -ENODEV;
1744
1745 if (down_trylock(&hid->driver_input_lock))
1746 return -EBUSY;
1747
1748 if (!hid->driver) {
1749 ret = -ENODEV;
1750 goto unlock;
1751 }
1752 report_enum = hid->report_enum + type;
1753 hdrv = hid->driver;
1754
1755 if (!size) {
1756 dbg_hid("empty report\n");
1757 ret = -1;
1758 goto unlock;
1759 }
1760
1761
1762 if (!list_empty(&hid->debug_list))
1763 hid_dump_report(hid, type, data, size);
1764
1765 report = hid_get_report(report_enum, data);
1766
1767 if (!report) {
1768 ret = -1;
1769 goto unlock;
1770 }
1771
1772 if (hdrv && hdrv->raw_event && hid_match_report(hid, report)) {
1773 ret = hdrv->raw_event(hid, report, data, size);
1774 if (ret < 0)
1775 goto unlock;
1776 }
1777
1778 ret = hid_report_raw_event(hid, type, data, size, interrupt);
1779
1780unlock:
1781 up(&hid->driver_input_lock);
1782 return ret;
1783}
1784EXPORT_SYMBOL_GPL(hid_input_report);
1785
1786bool hid_match_one_id(const struct hid_device *hdev,
1787 const struct hid_device_id *id)
1788{
1789 return (id->bus == HID_BUS_ANY || id->bus == hdev->bus) &&
1790 (id->group == HID_GROUP_ANY || id->group == hdev->group) &&
1791 (id->vendor == HID_ANY_ID || id->vendor == hdev->vendor) &&
1792 (id->product == HID_ANY_ID || id->product == hdev->product);
1793}
1794
1795const struct hid_device_id *hid_match_id(const struct hid_device *hdev,
1796 const struct hid_device_id *id)
1797{
1798 for (; id->bus; id++)
1799 if (hid_match_one_id(hdev, id))
1800 return id;
1801
1802 return NULL;
1803}
1804
1805static const struct hid_device_id hid_hiddev_list[] = {
1806 { HID_USB_DEVICE(USB_VENDOR_ID_MGE, USB_DEVICE_ID_MGE_UPS) },
1807 { HID_USB_DEVICE(USB_VENDOR_ID_MGE, USB_DEVICE_ID_MGE_UPS1) },
1808 { }
1809};
1810
1811static bool hid_hiddev(struct hid_device *hdev)
1812{
1813 return !!hid_match_id(hdev, hid_hiddev_list);
1814}
1815
1816
1817static ssize_t
1818read_report_descriptor(struct file *filp, struct kobject *kobj,
1819 struct bin_attribute *attr,
1820 char *buf, loff_t off, size_t count)
1821{
1822 struct device *dev = kobj_to_dev(kobj);
1823 struct hid_device *hdev = to_hid_device(dev);
1824
1825 if (off >= hdev->rsize)
1826 return 0;
1827
1828 if (off + count > hdev->rsize)
1829 count = hdev->rsize - off;
1830
1831 memcpy(buf, hdev->rdesc + off, count);
1832
1833 return count;
1834}
1835
1836static ssize_t
1837show_country(struct device *dev, struct device_attribute *attr,
1838 char *buf)
1839{
1840 struct hid_device *hdev = to_hid_device(dev);
1841
1842 return sprintf(buf, "%02x\n", hdev->country & 0xff);
1843}
1844
1845static struct bin_attribute dev_bin_attr_report_desc = {
1846 .attr = { .name = "report_descriptor", .mode = 0444 },
1847 .read = read_report_descriptor,
1848 .size = HID_MAX_DESCRIPTOR_SIZE,
1849};
1850
1851static const struct device_attribute dev_attr_country = {
1852 .attr = { .name = "country", .mode = 0444 },
1853 .show = show_country,
1854};
1855
1856int hid_connect(struct hid_device *hdev, unsigned int connect_mask)
1857{
1858 static const char *types[] = { "Device", "Pointer", "Mouse", "Device",
1859 "Joystick", "Gamepad", "Keyboard", "Keypad",
1860 "Multi-Axis Controller"
1861 };
1862 const char *type, *bus;
1863 char buf[64] = "";
1864 unsigned int i;
1865 int len;
1866 int ret;
1867
1868 if (hdev->quirks & HID_QUIRK_HIDDEV_FORCE)
1869 connect_mask |= (HID_CONNECT_HIDDEV_FORCE | HID_CONNECT_HIDDEV);
1870 if (hdev->quirks & HID_QUIRK_HIDINPUT_FORCE)
1871 connect_mask |= HID_CONNECT_HIDINPUT_FORCE;
1872 if (hdev->bus != BUS_USB)
1873 connect_mask &= ~HID_CONNECT_HIDDEV;
1874 if (hid_hiddev(hdev))
1875 connect_mask |= HID_CONNECT_HIDDEV_FORCE;
1876
1877 if ((connect_mask & HID_CONNECT_HIDINPUT) && !hidinput_connect(hdev,
1878 connect_mask & HID_CONNECT_HIDINPUT_FORCE))
1879 hdev->claimed |= HID_CLAIMED_INPUT;
1880
1881 if ((connect_mask & HID_CONNECT_HIDDEV) && hdev->hiddev_connect &&
1882 !hdev->hiddev_connect(hdev,
1883 connect_mask & HID_CONNECT_HIDDEV_FORCE))
1884 hdev->claimed |= HID_CLAIMED_HIDDEV;
1885 if ((connect_mask & HID_CONNECT_HIDRAW) && !hidraw_connect(hdev))
1886 hdev->claimed |= HID_CLAIMED_HIDRAW;
1887
1888 if (connect_mask & HID_CONNECT_DRIVER)
1889 hdev->claimed |= HID_CLAIMED_DRIVER;
1890
1891
1892
1893 if (!hdev->claimed && !hdev->driver->raw_event) {
1894 hid_err(hdev, "device has no listeners, quitting\n");
1895 return -ENODEV;
1896 }
1897
1898 if ((hdev->claimed & HID_CLAIMED_INPUT) &&
1899 (connect_mask & HID_CONNECT_FF) && hdev->ff_init)
1900 hdev->ff_init(hdev);
1901
1902 len = 0;
1903 if (hdev->claimed & HID_CLAIMED_INPUT)
1904 len += sprintf(buf + len, "input");
1905 if (hdev->claimed & HID_CLAIMED_HIDDEV)
1906 len += sprintf(buf + len, "%shiddev%d", len ? "," : "",
1907 ((struct hiddev *)hdev->hiddev)->minor);
1908 if (hdev->claimed & HID_CLAIMED_HIDRAW)
1909 len += sprintf(buf + len, "%shidraw%d", len ? "," : "",
1910 ((struct hidraw *)hdev->hidraw)->minor);
1911
1912 type = "Device";
1913 for (i = 0; i < hdev->maxcollection; i++) {
1914 struct hid_collection *col = &hdev->collection[i];
1915 if (col->type == HID_COLLECTION_APPLICATION &&
1916 (col->usage & HID_USAGE_PAGE) == HID_UP_GENDESK &&
1917 (col->usage & 0xffff) < ARRAY_SIZE(types)) {
1918 type = types[col->usage & 0xffff];
1919 break;
1920 }
1921 }
1922
1923 switch (hdev->bus) {
1924 case BUS_USB:
1925 bus = "USB";
1926 break;
1927 case BUS_BLUETOOTH:
1928 bus = "BLUETOOTH";
1929 break;
1930 case BUS_I2C:
1931 bus = "I2C";
1932 break;
1933 default:
1934 bus = "<UNKNOWN>";
1935 }
1936
1937 ret = device_create_file(&hdev->dev, &dev_attr_country);
1938 if (ret)
1939 hid_warn(hdev,
1940 "can't create sysfs country code attribute err: %d\n", ret);
1941
1942 hid_info(hdev, "%s: %s HID v%x.%02x %s [%s] on %s\n",
1943 buf, bus, hdev->version >> 8, hdev->version & 0xff,
1944 type, hdev->name, hdev->phys);
1945
1946 return 0;
1947}
1948EXPORT_SYMBOL_GPL(hid_connect);
1949
1950void hid_disconnect(struct hid_device *hdev)
1951{
1952 device_remove_file(&hdev->dev, &dev_attr_country);
1953 if (hdev->claimed & HID_CLAIMED_INPUT)
1954 hidinput_disconnect(hdev);
1955 if (hdev->claimed & HID_CLAIMED_HIDDEV)
1956 hdev->hiddev_disconnect(hdev);
1957 if (hdev->claimed & HID_CLAIMED_HIDRAW)
1958 hidraw_disconnect(hdev);
1959 hdev->claimed = 0;
1960}
1961EXPORT_SYMBOL_GPL(hid_disconnect);
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972int hid_hw_start(struct hid_device *hdev, unsigned int connect_mask)
1973{
1974 int error;
1975
1976 error = hdev->ll_driver->start(hdev);
1977 if (error)
1978 return error;
1979
1980 if (connect_mask) {
1981 error = hid_connect(hdev, connect_mask);
1982 if (error) {
1983 hdev->ll_driver->stop(hdev);
1984 return error;
1985 }
1986 }
1987
1988 return 0;
1989}
1990EXPORT_SYMBOL_GPL(hid_hw_start);
1991
1992
1993
1994
1995
1996
1997
1998
1999void hid_hw_stop(struct hid_device *hdev)
2000{
2001 hid_disconnect(hdev);
2002 hdev->ll_driver->stop(hdev);
2003}
2004EXPORT_SYMBOL_GPL(hid_hw_stop);
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014int hid_hw_open(struct hid_device *hdev)
2015{
2016 int ret;
2017
2018 ret = mutex_lock_killable(&hdev->ll_open_lock);
2019 if (ret)
2020 return ret;
2021
2022 if (!hdev->ll_open_count++) {
2023 ret = hdev->ll_driver->open(hdev);
2024 if (ret)
2025 hdev->ll_open_count--;
2026 }
2027
2028 mutex_unlock(&hdev->ll_open_lock);
2029 return ret;
2030}
2031EXPORT_SYMBOL_GPL(hid_hw_open);
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042void hid_hw_close(struct hid_device *hdev)
2043{
2044 mutex_lock(&hdev->ll_open_lock);
2045 if (!--hdev->ll_open_count)
2046 hdev->ll_driver->close(hdev);
2047 mutex_unlock(&hdev->ll_open_lock);
2048}
2049EXPORT_SYMBOL_GPL(hid_hw_close);
2050
2051struct hid_dynid {
2052 struct list_head list;
2053 struct hid_device_id id;
2054};
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065static ssize_t new_id_store(struct device_driver *drv, const char *buf,
2066 size_t count)
2067{
2068 struct hid_driver *hdrv = to_hid_driver(drv);
2069 struct hid_dynid *dynid;
2070 __u32 bus, vendor, product;
2071 unsigned long driver_data = 0;
2072 int ret;
2073
2074 ret = sscanf(buf, "%x %x %x %lx",
2075 &bus, &vendor, &product, &driver_data);
2076 if (ret < 3)
2077 return -EINVAL;
2078
2079 dynid = kzalloc(sizeof(*dynid), GFP_KERNEL);
2080 if (!dynid)
2081 return -ENOMEM;
2082
2083 dynid->id.bus = bus;
2084 dynid->id.group = HID_GROUP_ANY;
2085 dynid->id.vendor = vendor;
2086 dynid->id.product = product;
2087 dynid->id.driver_data = driver_data;
2088
2089 spin_lock(&hdrv->dyn_lock);
2090 list_add_tail(&dynid->list, &hdrv->dyn_list);
2091 spin_unlock(&hdrv->dyn_lock);
2092
2093 ret = driver_attach(&hdrv->driver);
2094
2095 return ret ? : count;
2096}
2097static DRIVER_ATTR_WO(new_id);
2098
2099static struct attribute *hid_drv_attrs[] = {
2100 &driver_attr_new_id.attr,
2101 NULL,
2102};
2103ATTRIBUTE_GROUPS(hid_drv);
2104
2105static void hid_free_dynids(struct hid_driver *hdrv)
2106{
2107 struct hid_dynid *dynid, *n;
2108
2109 spin_lock(&hdrv->dyn_lock);
2110 list_for_each_entry_safe(dynid, n, &hdrv->dyn_list, list) {
2111 list_del(&dynid->list);
2112 kfree(dynid);
2113 }
2114 spin_unlock(&hdrv->dyn_lock);
2115}
2116
2117const struct hid_device_id *hid_match_device(struct hid_device *hdev,
2118 struct hid_driver *hdrv)
2119{
2120 struct hid_dynid *dynid;
2121
2122 spin_lock(&hdrv->dyn_lock);
2123 list_for_each_entry(dynid, &hdrv->dyn_list, list) {
2124 if (hid_match_one_id(hdev, &dynid->id)) {
2125 spin_unlock(&hdrv->dyn_lock);
2126 return &dynid->id;
2127 }
2128 }
2129 spin_unlock(&hdrv->dyn_lock);
2130
2131 return hid_match_id(hdev, hdrv->id_table);
2132}
2133EXPORT_SYMBOL_GPL(hid_match_device);
2134
2135static int hid_bus_match(struct device *dev, struct device_driver *drv)
2136{
2137 struct hid_driver *hdrv = to_hid_driver(drv);
2138 struct hid_device *hdev = to_hid_device(dev);
2139
2140 return hid_match_device(hdev, hdrv) != NULL;
2141}
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153bool hid_compare_device_paths(struct hid_device *hdev_a,
2154 struct hid_device *hdev_b, char separator)
2155{
2156 int n1 = strrchr(hdev_a->phys, separator) - hdev_a->phys;
2157 int n2 = strrchr(hdev_b->phys, separator) - hdev_b->phys;
2158
2159 if (n1 != n2 || n1 <= 0 || n2 <= 0)
2160 return false;
2161
2162 return !strncmp(hdev_a->phys, hdev_b->phys, n1);
2163}
2164EXPORT_SYMBOL_GPL(hid_compare_device_paths);
2165
2166static int hid_device_probe(struct device *dev)
2167{
2168 struct hid_driver *hdrv = to_hid_driver(dev->driver);
2169 struct hid_device *hdev = to_hid_device(dev);
2170 const struct hid_device_id *id;
2171 int ret = 0;
2172
2173 if (down_interruptible(&hdev->driver_input_lock)) {
2174 ret = -EINTR;
2175 goto end;
2176 }
2177 hdev->io_started = false;
2178
2179 clear_bit(ffs(HID_STAT_REPROBED), &hdev->status);
2180
2181 if (!hdev->driver) {
2182 id = hid_match_device(hdev, hdrv);
2183 if (id == NULL) {
2184 ret = -ENODEV;
2185 goto unlock;
2186 }
2187
2188 if (hdrv->match) {
2189 if (!hdrv->match(hdev, hid_ignore_special_drivers)) {
2190 ret = -ENODEV;
2191 goto unlock;
2192 }
2193 } else {
2194
2195
2196
2197
2198
2199 if (hid_ignore_special_drivers) {
2200 ret = -ENODEV;
2201 goto unlock;
2202 }
2203 }
2204
2205
2206 hdev->quirks = hid_lookup_quirk(hdev);
2207 hdev->driver = hdrv;
2208 if (hdrv->probe) {
2209 ret = hdrv->probe(hdev, id);
2210 } else {
2211 ret = hid_open_report(hdev);
2212 if (!ret)
2213 ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
2214 }
2215 if (ret) {
2216 hid_close_report(hdev);
2217 hdev->driver = NULL;
2218 }
2219 }
2220unlock:
2221 if (!hdev->io_started)
2222 up(&hdev->driver_input_lock);
2223end:
2224 return ret;
2225}
2226
2227static int hid_device_remove(struct device *dev)
2228{
2229 struct hid_device *hdev = to_hid_device(dev);
2230 struct hid_driver *hdrv;
2231 int ret = 0;
2232
2233 if (down_interruptible(&hdev->driver_input_lock)) {
2234 ret = -EINTR;
2235 goto end;
2236 }
2237 hdev->io_started = false;
2238
2239 hdrv = hdev->driver;
2240 if (hdrv) {
2241 if (hdrv->remove)
2242 hdrv->remove(hdev);
2243 else
2244 hid_hw_stop(hdev);
2245 hid_close_report(hdev);
2246 hdev->driver = NULL;
2247 }
2248
2249 if (!hdev->io_started)
2250 up(&hdev->driver_input_lock);
2251end:
2252 return ret;
2253}
2254
2255static ssize_t modalias_show(struct device *dev, struct device_attribute *a,
2256 char *buf)
2257{
2258 struct hid_device *hdev = container_of(dev, struct hid_device, dev);
2259
2260 return scnprintf(buf, PAGE_SIZE, "hid:b%04Xg%04Xv%08Xp%08X\n",
2261 hdev->bus, hdev->group, hdev->vendor, hdev->product);
2262}
2263static DEVICE_ATTR_RO(modalias);
2264
2265static struct attribute *hid_dev_attrs[] = {
2266 &dev_attr_modalias.attr,
2267 NULL,
2268};
2269static struct bin_attribute *hid_dev_bin_attrs[] = {
2270 &dev_bin_attr_report_desc,
2271 NULL
2272};
2273static const struct attribute_group hid_dev_group = {
2274 .attrs = hid_dev_attrs,
2275 .bin_attrs = hid_dev_bin_attrs,
2276};
2277__ATTRIBUTE_GROUPS(hid_dev);
2278
2279static int hid_uevent(struct device *dev, struct kobj_uevent_env *env)
2280{
2281 struct hid_device *hdev = to_hid_device(dev);
2282
2283 if (add_uevent_var(env, "HID_ID=%04X:%08X:%08X",
2284 hdev->bus, hdev->vendor, hdev->product))
2285 return -ENOMEM;
2286
2287 if (add_uevent_var(env, "HID_NAME=%s", hdev->name))
2288 return -ENOMEM;
2289
2290 if (add_uevent_var(env, "HID_PHYS=%s", hdev->phys))
2291 return -ENOMEM;
2292
2293 if (add_uevent_var(env, "HID_UNIQ=%s", hdev->uniq))
2294 return -ENOMEM;
2295
2296 if (add_uevent_var(env, "MODALIAS=hid:b%04Xg%04Xv%08Xp%08X",
2297 hdev->bus, hdev->group, hdev->vendor, hdev->product))
2298 return -ENOMEM;
2299
2300 return 0;
2301}
2302
2303struct bus_type hid_bus_type = {
2304 .name = "hid",
2305 .dev_groups = hid_dev_groups,
2306 .drv_groups = hid_drv_groups,
2307 .match = hid_bus_match,
2308 .probe = hid_device_probe,
2309 .remove = hid_device_remove,
2310 .uevent = hid_uevent,
2311};
2312EXPORT_SYMBOL(hid_bus_type);
2313
2314int hid_add_device(struct hid_device *hdev)
2315{
2316 static atomic_t id = ATOMIC_INIT(0);
2317 int ret;
2318
2319 if (WARN_ON(hdev->status & HID_STAT_ADDED))
2320 return -EBUSY;
2321
2322 hdev->quirks = hid_lookup_quirk(hdev);
2323
2324
2325
2326 if (hid_ignore(hdev))
2327 return -ENODEV;
2328
2329
2330
2331
2332 if (!hdev->ll_driver->raw_request) {
2333 hid_err(hdev, "transport driver missing .raw_request()\n");
2334 return -EINVAL;
2335 }
2336
2337
2338
2339
2340
2341 ret = hdev->ll_driver->parse(hdev);
2342 if (ret)
2343 return ret;
2344 if (!hdev->dev_rdesc)
2345 return -ENODEV;
2346
2347
2348
2349
2350 if (hid_ignore_special_drivers) {
2351 hdev->group = HID_GROUP_GENERIC;
2352 } else if (!hdev->group &&
2353 !(hdev->quirks & HID_QUIRK_HAVE_SPECIAL_DRIVER)) {
2354 ret = hid_scan_report(hdev);
2355 if (ret)
2356 hid_warn(hdev, "bad device descriptor (%d)\n", ret);
2357 }
2358
2359
2360
2361 dev_set_name(&hdev->dev, "%04X:%04X:%04X.%04X", hdev->bus,
2362 hdev->vendor, hdev->product, atomic_inc_return(&id));
2363
2364 hid_debug_register(hdev, dev_name(&hdev->dev));
2365 ret = device_add(&hdev->dev);
2366 if (!ret)
2367 hdev->status |= HID_STAT_ADDED;
2368 else
2369 hid_debug_unregister(hdev);
2370
2371 return ret;
2372}
2373EXPORT_SYMBOL_GPL(hid_add_device);
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384struct hid_device *hid_allocate_device(void)
2385{
2386 struct hid_device *hdev;
2387 int ret = -ENOMEM;
2388
2389 hdev = kzalloc(sizeof(*hdev), GFP_KERNEL);
2390 if (hdev == NULL)
2391 return ERR_PTR(ret);
2392
2393 device_initialize(&hdev->dev);
2394 hdev->dev.release = hid_device_release;
2395 hdev->dev.bus = &hid_bus_type;
2396 device_enable_async_suspend(&hdev->dev);
2397
2398 hid_close_report(hdev);
2399
2400 init_waitqueue_head(&hdev->debug_wait);
2401 INIT_LIST_HEAD(&hdev->debug_list);
2402 spin_lock_init(&hdev->debug_list_lock);
2403 sema_init(&hdev->driver_input_lock, 1);
2404 mutex_init(&hdev->ll_open_lock);
2405
2406 return hdev;
2407}
2408EXPORT_SYMBOL_GPL(hid_allocate_device);
2409
2410static void hid_remove_device(struct hid_device *hdev)
2411{
2412 if (hdev->status & HID_STAT_ADDED) {
2413 device_del(&hdev->dev);
2414 hid_debug_unregister(hdev);
2415 hdev->status &= ~HID_STAT_ADDED;
2416 }
2417 kfree(hdev->dev_rdesc);
2418 hdev->dev_rdesc = NULL;
2419 hdev->dev_rsize = 0;
2420}
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430void hid_destroy_device(struct hid_device *hdev)
2431{
2432 hid_remove_device(hdev);
2433 put_device(&hdev->dev);
2434}
2435EXPORT_SYMBOL_GPL(hid_destroy_device);
2436
2437
2438static int __hid_bus_reprobe_drivers(struct device *dev, void *data)
2439{
2440 struct hid_driver *hdrv = data;
2441 struct hid_device *hdev = to_hid_device(dev);
2442
2443 if (hdev->driver == hdrv &&
2444 !hdrv->match(hdev, hid_ignore_special_drivers) &&
2445 !test_and_set_bit(ffs(HID_STAT_REPROBED), &hdev->status))
2446 return device_reprobe(dev);
2447
2448 return 0;
2449}
2450
2451static int __hid_bus_driver_added(struct device_driver *drv, void *data)
2452{
2453 struct hid_driver *hdrv = to_hid_driver(drv);
2454
2455 if (hdrv->match) {
2456 bus_for_each_dev(&hid_bus_type, NULL, hdrv,
2457 __hid_bus_reprobe_drivers);
2458 }
2459
2460 return 0;
2461}
2462
2463static int __bus_removed_driver(struct device_driver *drv, void *data)
2464{
2465 return bus_rescan_devices(&hid_bus_type);
2466}
2467
2468int __hid_register_driver(struct hid_driver *hdrv, struct module *owner,
2469 const char *mod_name)
2470{
2471 int ret;
2472
2473 hdrv->driver.name = hdrv->name;
2474 hdrv->driver.bus = &hid_bus_type;
2475 hdrv->driver.owner = owner;
2476 hdrv->driver.mod_name = mod_name;
2477
2478 INIT_LIST_HEAD(&hdrv->dyn_list);
2479 spin_lock_init(&hdrv->dyn_lock);
2480
2481 ret = driver_register(&hdrv->driver);
2482
2483 if (ret == 0)
2484 bus_for_each_drv(&hid_bus_type, NULL, NULL,
2485 __hid_bus_driver_added);
2486
2487 return ret;
2488}
2489EXPORT_SYMBOL_GPL(__hid_register_driver);
2490
2491void hid_unregister_driver(struct hid_driver *hdrv)
2492{
2493 driver_unregister(&hdrv->driver);
2494 hid_free_dynids(hdrv);
2495
2496 bus_for_each_drv(&hid_bus_type, NULL, hdrv, __bus_removed_driver);
2497}
2498EXPORT_SYMBOL_GPL(hid_unregister_driver);
2499
2500int hid_check_keys_pressed(struct hid_device *hid)
2501{
2502 struct hid_input *hidinput;
2503 int i;
2504
2505 if (!(hid->claimed & HID_CLAIMED_INPUT))
2506 return 0;
2507
2508 list_for_each_entry(hidinput, &hid->inputs, list) {
2509 for (i = 0; i < BITS_TO_LONGS(KEY_MAX); i++)
2510 if (hidinput->input->key[i])
2511 return 1;
2512 }
2513
2514 return 0;
2515}
2516
2517EXPORT_SYMBOL_GPL(hid_check_keys_pressed);
2518
2519static int __init hid_init(void)
2520{
2521 int ret;
2522
2523 if (hid_debug)
2524 pr_warn("hid_debug is now used solely for parser and driver debugging.\n"
2525 "debugfs is now used for inspecting the device (report descriptor, reports)\n");
2526
2527 ret = bus_register(&hid_bus_type);
2528 if (ret) {
2529 pr_err("can't register hid bus\n");
2530 goto err;
2531 }
2532
2533 ret = hidraw_init();
2534 if (ret)
2535 goto err_bus;
2536
2537 hid_debug_init();
2538
2539 return 0;
2540err_bus:
2541 bus_unregister(&hid_bus_type);
2542err:
2543 return ret;
2544}
2545
2546static void __exit hid_exit(void)
2547{
2548 hid_debug_exit();
2549 hidraw_exit();
2550 bus_unregister(&hid_bus_type);
2551 hid_quirks_exit(HID_BUS_ANY);
2552}
2553
2554module_init(hid_init);
2555module_exit(hid_exit);
2556
2557MODULE_AUTHOR("Andreas Gal");
2558MODULE_AUTHOR("Vojtech Pavlik");
2559MODULE_AUTHOR("Jiri Kosina");
2560MODULE_LICENSE("GPL");
2561