This source file includes following definitions.
- hiddev_lookup_report
- hiddev_lookup_usage
- hiddev_send_event
- hiddev_hid_event
- hiddev_report_event
- hiddev_fasync
- hiddev_release
- __hiddev_open
- hiddev_open
- hiddev_write
- hiddev_read
- hiddev_poll
- hiddev_ioctl_usage
- hiddev_ioctl_string
- hiddev_ioctl
- hiddev_compat_ioctl
- hiddev_devnode
- hiddev_connect
- hiddev_disconnect
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15 #include <linux/poll.h>
16 #include <linux/slab.h>
17 #include <linux/sched/signal.h>
18 #include <linux/module.h>
19 #include <linux/init.h>
20 #include <linux/input.h>
21 #include <linux/usb.h>
22 #include <linux/hid.h>
23 #include <linux/hiddev.h>
24 #include <linux/compat.h>
25 #include <linux/vmalloc.h>
26 #include <linux/nospec.h>
27 #include "usbhid.h"
28
29 #ifdef CONFIG_USB_DYNAMIC_MINORS
30 #define HIDDEV_MINOR_BASE 0
31 #define HIDDEV_MINORS 256
32 #else
33 #define HIDDEV_MINOR_BASE 96
34 #define HIDDEV_MINORS 16
35 #endif
36 #define HIDDEV_BUFFER_SIZE 2048
37
38 struct hiddev_list {
39 struct hiddev_usage_ref buffer[HIDDEV_BUFFER_SIZE];
40 int head;
41 int tail;
42 unsigned flags;
43 struct fasync_struct *fasync;
44 struct hiddev *hiddev;
45 struct list_head node;
46 struct mutex thread_lock;
47 };
48
49
50
51
52
53
54
55 static struct hid_report *
56 hiddev_lookup_report(struct hid_device *hid, struct hiddev_report_info *rinfo)
57 {
58 unsigned int flags = rinfo->report_id & ~HID_REPORT_ID_MASK;
59 unsigned int rid = rinfo->report_id & HID_REPORT_ID_MASK;
60 struct hid_report_enum *report_enum;
61 struct hid_report *report;
62 struct list_head *list;
63
64 if (rinfo->report_type < HID_REPORT_TYPE_MIN ||
65 rinfo->report_type > HID_REPORT_TYPE_MAX)
66 return NULL;
67
68 report_enum = hid->report_enum +
69 (rinfo->report_type - HID_REPORT_TYPE_MIN);
70
71 switch (flags) {
72 case 0:
73 break;
74
75 case HID_REPORT_ID_FIRST:
76 if (list_empty(&report_enum->report_list))
77 return NULL;
78
79 list = report_enum->report_list.next;
80 report = list_entry(list, struct hid_report, list);
81 rinfo->report_id = report->id;
82 break;
83
84 case HID_REPORT_ID_NEXT:
85 report = report_enum->report_id_hash[rid];
86 if (!report)
87 return NULL;
88
89 list = report->list.next;
90 if (list == &report_enum->report_list)
91 return NULL;
92
93 report = list_entry(list, struct hid_report, list);
94 rinfo->report_id = report->id;
95 break;
96
97 default:
98 return NULL;
99 }
100
101 return report_enum->report_id_hash[rinfo->report_id];
102 }
103
104
105
106
107
108 static struct hid_field *
109 hiddev_lookup_usage(struct hid_device *hid, struct hiddev_usage_ref *uref)
110 {
111 int i, j;
112 struct hid_report *report;
113 struct hid_report_enum *report_enum;
114 struct hid_field *field;
115
116 if (uref->report_type < HID_REPORT_TYPE_MIN ||
117 uref->report_type > HID_REPORT_TYPE_MAX)
118 return NULL;
119
120 report_enum = hid->report_enum +
121 (uref->report_type - HID_REPORT_TYPE_MIN);
122
123 list_for_each_entry(report, &report_enum->report_list, list) {
124 for (i = 0; i < report->maxfield; i++) {
125 field = report->field[i];
126 for (j = 0; j < field->maxusage; j++) {
127 if (field->usage[j].hid == uref->usage_code) {
128 uref->report_id = report->id;
129 uref->field_index = i;
130 uref->usage_index = j;
131 return field;
132 }
133 }
134 }
135 }
136
137 return NULL;
138 }
139
140 static void hiddev_send_event(struct hid_device *hid,
141 struct hiddev_usage_ref *uref)
142 {
143 struct hiddev *hiddev = hid->hiddev;
144 struct hiddev_list *list;
145 unsigned long flags;
146
147 spin_lock_irqsave(&hiddev->list_lock, flags);
148 list_for_each_entry(list, &hiddev->list, node) {
149 if (uref->field_index != HID_FIELD_INDEX_NONE ||
150 (list->flags & HIDDEV_FLAG_REPORT) != 0) {
151 list->buffer[list->head] = *uref;
152 list->head = (list->head + 1) &
153 (HIDDEV_BUFFER_SIZE - 1);
154 kill_fasync(&list->fasync, SIGIO, POLL_IN);
155 }
156 }
157 spin_unlock_irqrestore(&hiddev->list_lock, flags);
158
159 wake_up_interruptible(&hiddev->wait);
160 }
161
162
163
164
165
166 void hiddev_hid_event(struct hid_device *hid, struct hid_field *field,
167 struct hid_usage *usage, __s32 value)
168 {
169 unsigned type = field->report_type;
170 struct hiddev_usage_ref uref;
171
172 uref.report_type =
173 (type == HID_INPUT_REPORT) ? HID_REPORT_TYPE_INPUT :
174 ((type == HID_OUTPUT_REPORT) ? HID_REPORT_TYPE_OUTPUT :
175 ((type == HID_FEATURE_REPORT) ? HID_REPORT_TYPE_FEATURE : 0));
176 uref.report_id = field->report->id;
177 uref.field_index = field->index;
178 uref.usage_index = (usage - field->usage);
179 uref.usage_code = usage->hid;
180 uref.value = value;
181
182 hiddev_send_event(hid, &uref);
183 }
184 EXPORT_SYMBOL_GPL(hiddev_hid_event);
185
186 void hiddev_report_event(struct hid_device *hid, struct hid_report *report)
187 {
188 unsigned type = report->type;
189 struct hiddev_usage_ref uref;
190
191 memset(&uref, 0, sizeof(uref));
192 uref.report_type =
193 (type == HID_INPUT_REPORT) ? HID_REPORT_TYPE_INPUT :
194 ((type == HID_OUTPUT_REPORT) ? HID_REPORT_TYPE_OUTPUT :
195 ((type == HID_FEATURE_REPORT) ? HID_REPORT_TYPE_FEATURE : 0));
196 uref.report_id = report->id;
197 uref.field_index = HID_FIELD_INDEX_NONE;
198
199 hiddev_send_event(hid, &uref);
200 }
201
202
203
204
205 static int hiddev_fasync(int fd, struct file *file, int on)
206 {
207 struct hiddev_list *list = file->private_data;
208
209 return fasync_helper(fd, file, on, &list->fasync);
210 }
211
212
213
214
215
216 static int hiddev_release(struct inode * inode, struct file * file)
217 {
218 struct hiddev_list *list = file->private_data;
219 unsigned long flags;
220
221 spin_lock_irqsave(&list->hiddev->list_lock, flags);
222 list_del(&list->node);
223 spin_unlock_irqrestore(&list->hiddev->list_lock, flags);
224
225 mutex_lock(&list->hiddev->existancelock);
226 if (!--list->hiddev->open) {
227 if (list->hiddev->exist) {
228 hid_hw_close(list->hiddev->hid);
229 hid_hw_power(list->hiddev->hid, PM_HINT_NORMAL);
230 } else {
231 mutex_unlock(&list->hiddev->existancelock);
232 kfree(list->hiddev);
233 vfree(list);
234 return 0;
235 }
236 }
237
238 mutex_unlock(&list->hiddev->existancelock);
239 vfree(list);
240
241 return 0;
242 }
243
244 static int __hiddev_open(struct hiddev *hiddev, struct file *file)
245 {
246 struct hiddev_list *list;
247 int error;
248
249 lockdep_assert_held(&hiddev->existancelock);
250
251 list = vzalloc(sizeof(*list));
252 if (!list)
253 return -ENOMEM;
254
255 mutex_init(&list->thread_lock);
256 list->hiddev = hiddev;
257
258 if (!hiddev->open++) {
259 error = hid_hw_power(hiddev->hid, PM_HINT_FULLON);
260 if (error < 0)
261 goto err_drop_count;
262
263 error = hid_hw_open(hiddev->hid);
264 if (error < 0)
265 goto err_normal_power;
266 }
267
268 spin_lock_irq(&hiddev->list_lock);
269 list_add_tail(&list->node, &hiddev->list);
270 spin_unlock_irq(&hiddev->list_lock);
271
272 file->private_data = list;
273
274 return 0;
275
276 err_normal_power:
277 hid_hw_power(hiddev->hid, PM_HINT_NORMAL);
278 err_drop_count:
279 hiddev->open--;
280 vfree(list);
281 return error;
282 }
283
284
285
286
287 static int hiddev_open(struct inode *inode, struct file *file)
288 {
289 struct usb_interface *intf;
290 struct hid_device *hid;
291 struct hiddev *hiddev;
292 int res;
293
294 intf = usbhid_find_interface(iminor(inode));
295 if (!intf)
296 return -ENODEV;
297
298 hid = usb_get_intfdata(intf);
299 hiddev = hid->hiddev;
300
301 mutex_lock(&hiddev->existancelock);
302 res = hiddev->exist ? __hiddev_open(hiddev, file) : -ENODEV;
303 mutex_unlock(&hiddev->existancelock);
304
305 return res;
306 }
307
308
309
310
311 static ssize_t hiddev_write(struct file * file, const char __user * buffer, size_t count, loff_t *ppos)
312 {
313 return -EINVAL;
314 }
315
316
317
318
319 static ssize_t hiddev_read(struct file * file, char __user * buffer, size_t count, loff_t *ppos)
320 {
321 DEFINE_WAIT(wait);
322 struct hiddev_list *list = file->private_data;
323 int event_size;
324 int retval;
325
326 event_size = ((list->flags & HIDDEV_FLAG_UREF) != 0) ?
327 sizeof(struct hiddev_usage_ref) : sizeof(struct hiddev_event);
328
329 if (count < event_size)
330 return 0;
331
332
333 retval = mutex_lock_interruptible(&list->thread_lock);
334 if (retval)
335 return -ERESTARTSYS;
336
337 while (retval == 0) {
338 if (list->head == list->tail) {
339 prepare_to_wait(&list->hiddev->wait, &wait, TASK_INTERRUPTIBLE);
340
341 while (list->head == list->tail) {
342 if (signal_pending(current)) {
343 retval = -ERESTARTSYS;
344 break;
345 }
346 if (!list->hiddev->exist) {
347 retval = -EIO;
348 break;
349 }
350 if (file->f_flags & O_NONBLOCK) {
351 retval = -EAGAIN;
352 break;
353 }
354
355
356 mutex_unlock(&list->thread_lock);
357 schedule();
358 if (mutex_lock_interruptible(&list->thread_lock)) {
359 finish_wait(&list->hiddev->wait, &wait);
360 return -EINTR;
361 }
362 set_current_state(TASK_INTERRUPTIBLE);
363 }
364 finish_wait(&list->hiddev->wait, &wait);
365
366 }
367
368 if (retval) {
369 mutex_unlock(&list->thread_lock);
370 return retval;
371 }
372
373
374 while (list->head != list->tail &&
375 retval + event_size <= count) {
376 if ((list->flags & HIDDEV_FLAG_UREF) == 0) {
377 if (list->buffer[list->tail].field_index != HID_FIELD_INDEX_NONE) {
378 struct hiddev_event event;
379
380 event.hid = list->buffer[list->tail].usage_code;
381 event.value = list->buffer[list->tail].value;
382 if (copy_to_user(buffer + retval, &event, sizeof(struct hiddev_event))) {
383 mutex_unlock(&list->thread_lock);
384 return -EFAULT;
385 }
386 retval += sizeof(struct hiddev_event);
387 }
388 } else {
389 if (list->buffer[list->tail].field_index != HID_FIELD_INDEX_NONE ||
390 (list->flags & HIDDEV_FLAG_REPORT) != 0) {
391
392 if (copy_to_user(buffer + retval, list->buffer + list->tail, sizeof(struct hiddev_usage_ref))) {
393 mutex_unlock(&list->thread_lock);
394 return -EFAULT;
395 }
396 retval += sizeof(struct hiddev_usage_ref);
397 }
398 }
399 list->tail = (list->tail + 1) & (HIDDEV_BUFFER_SIZE - 1);
400 }
401
402 }
403 mutex_unlock(&list->thread_lock);
404
405 return retval;
406 }
407
408
409
410
411
412 static __poll_t hiddev_poll(struct file *file, poll_table *wait)
413 {
414 struct hiddev_list *list = file->private_data;
415
416 poll_wait(file, &list->hiddev->wait, wait);
417 if (list->head != list->tail)
418 return EPOLLIN | EPOLLRDNORM | EPOLLOUT;
419 if (!list->hiddev->exist)
420 return EPOLLERR | EPOLLHUP;
421 return 0;
422 }
423
424
425
426
427 static noinline int hiddev_ioctl_usage(struct hiddev *hiddev, unsigned int cmd, void __user *user_arg)
428 {
429 struct hid_device *hid = hiddev->hid;
430 struct hiddev_report_info rinfo;
431 struct hiddev_usage_ref_multi *uref_multi = NULL;
432 struct hiddev_usage_ref *uref;
433 struct hid_report *report;
434 struct hid_field *field;
435 int i;
436
437 uref_multi = kmalloc(sizeof(struct hiddev_usage_ref_multi), GFP_KERNEL);
438 if (!uref_multi)
439 return -ENOMEM;
440 uref = &uref_multi->uref;
441 if (cmd == HIDIOCGUSAGES || cmd == HIDIOCSUSAGES) {
442 if (copy_from_user(uref_multi, user_arg,
443 sizeof(*uref_multi)))
444 goto fault;
445 } else {
446 if (copy_from_user(uref, user_arg, sizeof(*uref)))
447 goto fault;
448 }
449
450 switch (cmd) {
451 case HIDIOCGUCODE:
452 rinfo.report_type = uref->report_type;
453 rinfo.report_id = uref->report_id;
454 if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL)
455 goto inval;
456
457 if (uref->field_index >= report->maxfield)
458 goto inval;
459 uref->field_index = array_index_nospec(uref->field_index,
460 report->maxfield);
461
462 field = report->field[uref->field_index];
463 if (uref->usage_index >= field->maxusage)
464 goto inval;
465 uref->usage_index = array_index_nospec(uref->usage_index,
466 field->maxusage);
467
468 uref->usage_code = field->usage[uref->usage_index].hid;
469
470 if (copy_to_user(user_arg, uref, sizeof(*uref)))
471 goto fault;
472
473 goto goodreturn;
474
475 default:
476 if (cmd != HIDIOCGUSAGE &&
477 cmd != HIDIOCGUSAGES &&
478 uref->report_type == HID_REPORT_TYPE_INPUT)
479 goto inval;
480
481 if (uref->report_id == HID_REPORT_ID_UNKNOWN) {
482 field = hiddev_lookup_usage(hid, uref);
483 if (field == NULL)
484 goto inval;
485 } else {
486 rinfo.report_type = uref->report_type;
487 rinfo.report_id = uref->report_id;
488 if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL)
489 goto inval;
490
491 if (uref->field_index >= report->maxfield)
492 goto inval;
493 uref->field_index = array_index_nospec(uref->field_index,
494 report->maxfield);
495
496 field = report->field[uref->field_index];
497
498 if (cmd == HIDIOCGCOLLECTIONINDEX) {
499 if (uref->usage_index >= field->maxusage)
500 goto inval;
501 uref->usage_index =
502 array_index_nospec(uref->usage_index,
503 field->maxusage);
504 } else if (uref->usage_index >= field->report_count)
505 goto inval;
506 }
507
508 if (cmd == HIDIOCGUSAGES || cmd == HIDIOCSUSAGES) {
509 if (uref_multi->num_values > HID_MAX_MULTI_USAGES ||
510 uref->usage_index + uref_multi->num_values >
511 field->report_count)
512 goto inval;
513
514 uref->usage_index =
515 array_index_nospec(uref->usage_index,
516 field->report_count -
517 uref_multi->num_values);
518 }
519
520 switch (cmd) {
521 case HIDIOCGUSAGE:
522 uref->value = field->value[uref->usage_index];
523 if (copy_to_user(user_arg, uref, sizeof(*uref)))
524 goto fault;
525 goto goodreturn;
526
527 case HIDIOCSUSAGE:
528 field->value[uref->usage_index] = uref->value;
529 goto goodreturn;
530
531 case HIDIOCGCOLLECTIONINDEX:
532 i = field->usage[uref->usage_index].collection_index;
533 kfree(uref_multi);
534 return i;
535 case HIDIOCGUSAGES:
536 for (i = 0; i < uref_multi->num_values; i++)
537 uref_multi->values[i] =
538 field->value[uref->usage_index + i];
539 if (copy_to_user(user_arg, uref_multi,
540 sizeof(*uref_multi)))
541 goto fault;
542 goto goodreturn;
543 case HIDIOCSUSAGES:
544 for (i = 0; i < uref_multi->num_values; i++)
545 field->value[uref->usage_index + i] =
546 uref_multi->values[i];
547 goto goodreturn;
548 }
549
550 goodreturn:
551 kfree(uref_multi);
552 return 0;
553 fault:
554 kfree(uref_multi);
555 return -EFAULT;
556 inval:
557 kfree(uref_multi);
558 return -EINVAL;
559 }
560 }
561
562 static noinline int hiddev_ioctl_string(struct hiddev *hiddev, unsigned int cmd, void __user *user_arg)
563 {
564 struct hid_device *hid = hiddev->hid;
565 struct usb_device *dev = hid_to_usb_dev(hid);
566 int idx, len;
567 char *buf;
568
569 if (get_user(idx, (int __user *)user_arg))
570 return -EFAULT;
571
572 if ((buf = kmalloc(HID_STRING_SIZE, GFP_KERNEL)) == NULL)
573 return -ENOMEM;
574
575 if ((len = usb_string(dev, idx, buf, HID_STRING_SIZE-1)) < 0) {
576 kfree(buf);
577 return -EINVAL;
578 }
579
580 if (copy_to_user(user_arg+sizeof(int), buf, len+1)) {
581 kfree(buf);
582 return -EFAULT;
583 }
584
585 kfree(buf);
586
587 return len;
588 }
589
590 static long hiddev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
591 {
592 struct hiddev_list *list = file->private_data;
593 struct hiddev *hiddev = list->hiddev;
594 struct hid_device *hid;
595 struct hiddev_collection_info cinfo;
596 struct hiddev_report_info rinfo;
597 struct hiddev_field_info finfo;
598 struct hiddev_devinfo dinfo;
599 struct hid_report *report;
600 struct hid_field *field;
601 void __user *user_arg = (void __user *)arg;
602 int i, r = -EINVAL;
603
604
605
606 mutex_lock(&hiddev->existancelock);
607 if (!hiddev->exist) {
608 r = -ENODEV;
609 goto ret_unlock;
610 }
611
612 hid = hiddev->hid;
613
614 switch (cmd) {
615
616 case HIDIOCGVERSION:
617 r = put_user(HID_VERSION, (int __user *)arg) ?
618 -EFAULT : 0;
619 break;
620
621 case HIDIOCAPPLICATION:
622 if (arg >= hid->maxapplication)
623 break;
624
625 for (i = 0; i < hid->maxcollection; i++)
626 if (hid->collection[i].type ==
627 HID_COLLECTION_APPLICATION && arg-- == 0)
628 break;
629
630 if (i < hid->maxcollection)
631 r = hid->collection[i].usage;
632 break;
633
634 case HIDIOCGDEVINFO:
635 {
636 struct usb_device *dev = hid_to_usb_dev(hid);
637 struct usbhid_device *usbhid = hid->driver_data;
638
639 memset(&dinfo, 0, sizeof(dinfo));
640
641 dinfo.bustype = BUS_USB;
642 dinfo.busnum = dev->bus->busnum;
643 dinfo.devnum = dev->devnum;
644 dinfo.ifnum = usbhid->ifnum;
645 dinfo.vendor = le16_to_cpu(dev->descriptor.idVendor);
646 dinfo.product = le16_to_cpu(dev->descriptor.idProduct);
647 dinfo.version = le16_to_cpu(dev->descriptor.bcdDevice);
648 dinfo.num_applications = hid->maxapplication;
649
650 r = copy_to_user(user_arg, &dinfo, sizeof(dinfo)) ?
651 -EFAULT : 0;
652 break;
653 }
654
655 case HIDIOCGFLAG:
656 r = put_user(list->flags, (int __user *)arg) ?
657 -EFAULT : 0;
658 break;
659
660 case HIDIOCSFLAG:
661 {
662 int newflags;
663
664 if (get_user(newflags, (int __user *)arg)) {
665 r = -EFAULT;
666 break;
667 }
668
669 if ((newflags & ~HIDDEV_FLAGS) != 0 ||
670 ((newflags & HIDDEV_FLAG_REPORT) != 0 &&
671 (newflags & HIDDEV_FLAG_UREF) == 0))
672 break;
673
674 list->flags = newflags;
675
676 r = 0;
677 break;
678 }
679
680 case HIDIOCGSTRING:
681 r = hiddev_ioctl_string(hiddev, cmd, user_arg);
682 break;
683
684 case HIDIOCINITREPORT:
685 usbhid_init_reports(hid);
686 hiddev->initialized = true;
687 r = 0;
688 break;
689
690 case HIDIOCGREPORT:
691 if (copy_from_user(&rinfo, user_arg, sizeof(rinfo))) {
692 r = -EFAULT;
693 break;
694 }
695
696 if (rinfo.report_type == HID_REPORT_TYPE_OUTPUT)
697 break;
698
699 report = hiddev_lookup_report(hid, &rinfo);
700 if (report == NULL)
701 break;
702
703 hid_hw_request(hid, report, HID_REQ_GET_REPORT);
704 hid_hw_wait(hid);
705
706 r = 0;
707 break;
708
709 case HIDIOCSREPORT:
710 if (copy_from_user(&rinfo, user_arg, sizeof(rinfo))) {
711 r = -EFAULT;
712 break;
713 }
714
715 if (rinfo.report_type == HID_REPORT_TYPE_INPUT)
716 break;
717
718 report = hiddev_lookup_report(hid, &rinfo);
719 if (report == NULL)
720 break;
721
722 hid_hw_request(hid, report, HID_REQ_SET_REPORT);
723 hid_hw_wait(hid);
724
725 r = 0;
726 break;
727
728 case HIDIOCGREPORTINFO:
729 if (copy_from_user(&rinfo, user_arg, sizeof(rinfo))) {
730 r = -EFAULT;
731 break;
732 }
733
734 report = hiddev_lookup_report(hid, &rinfo);
735 if (report == NULL)
736 break;
737
738 rinfo.num_fields = report->maxfield;
739
740 r = copy_to_user(user_arg, &rinfo, sizeof(rinfo)) ?
741 -EFAULT : 0;
742 break;
743
744 case HIDIOCGFIELDINFO:
745 if (copy_from_user(&finfo, user_arg, sizeof(finfo))) {
746 r = -EFAULT;
747 break;
748 }
749
750 rinfo.report_type = finfo.report_type;
751 rinfo.report_id = finfo.report_id;
752
753 report = hiddev_lookup_report(hid, &rinfo);
754 if (report == NULL)
755 break;
756
757 if (finfo.field_index >= report->maxfield)
758 break;
759 finfo.field_index = array_index_nospec(finfo.field_index,
760 report->maxfield);
761
762 field = report->field[finfo.field_index];
763 memset(&finfo, 0, sizeof(finfo));
764 finfo.report_type = rinfo.report_type;
765 finfo.report_id = rinfo.report_id;
766 finfo.field_index = field->report_count - 1;
767 finfo.maxusage = field->maxusage;
768 finfo.flags = field->flags;
769 finfo.physical = field->physical;
770 finfo.logical = field->logical;
771 finfo.application = field->application;
772 finfo.logical_minimum = field->logical_minimum;
773 finfo.logical_maximum = field->logical_maximum;
774 finfo.physical_minimum = field->physical_minimum;
775 finfo.physical_maximum = field->physical_maximum;
776 finfo.unit_exponent = field->unit_exponent;
777 finfo.unit = field->unit;
778
779 r = copy_to_user(user_arg, &finfo, sizeof(finfo)) ?
780 -EFAULT : 0;
781 break;
782
783 case HIDIOCGUCODE:
784
785 case HIDIOCGUSAGE:
786 case HIDIOCSUSAGE:
787 case HIDIOCGUSAGES:
788 case HIDIOCSUSAGES:
789 case HIDIOCGCOLLECTIONINDEX:
790 if (!hiddev->initialized) {
791 usbhid_init_reports(hid);
792 hiddev->initialized = true;
793 }
794 r = hiddev_ioctl_usage(hiddev, cmd, user_arg);
795 break;
796
797 case HIDIOCGCOLLECTIONINFO:
798 if (copy_from_user(&cinfo, user_arg, sizeof(cinfo))) {
799 r = -EFAULT;
800 break;
801 }
802
803 if (cinfo.index >= hid->maxcollection)
804 break;
805 cinfo.index = array_index_nospec(cinfo.index,
806 hid->maxcollection);
807
808 cinfo.type = hid->collection[cinfo.index].type;
809 cinfo.usage = hid->collection[cinfo.index].usage;
810 cinfo.level = hid->collection[cinfo.index].level;
811
812 r = copy_to_user(user_arg, &cinfo, sizeof(cinfo)) ?
813 -EFAULT : 0;
814 break;
815
816 default:
817 if (_IOC_TYPE(cmd) != 'H' || _IOC_DIR(cmd) != _IOC_READ)
818 break;
819
820 if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGNAME(0))) {
821 int len = strlen(hid->name) + 1;
822 if (len > _IOC_SIZE(cmd))
823 len = _IOC_SIZE(cmd);
824 r = copy_to_user(user_arg, hid->name, len) ?
825 -EFAULT : len;
826 break;
827 }
828
829 if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGPHYS(0))) {
830 int len = strlen(hid->phys) + 1;
831 if (len > _IOC_SIZE(cmd))
832 len = _IOC_SIZE(cmd);
833 r = copy_to_user(user_arg, hid->phys, len) ?
834 -EFAULT : len;
835 break;
836 }
837 }
838
839 ret_unlock:
840 mutex_unlock(&hiddev->existancelock);
841 return r;
842 }
843
844 #ifdef CONFIG_COMPAT
845 static long hiddev_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
846 {
847 return hiddev_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
848 }
849 #endif
850
851 static const struct file_operations hiddev_fops = {
852 .owner = THIS_MODULE,
853 .read = hiddev_read,
854 .write = hiddev_write,
855 .poll = hiddev_poll,
856 .open = hiddev_open,
857 .release = hiddev_release,
858 .unlocked_ioctl = hiddev_ioctl,
859 .fasync = hiddev_fasync,
860 #ifdef CONFIG_COMPAT
861 .compat_ioctl = hiddev_compat_ioctl,
862 #endif
863 .llseek = noop_llseek,
864 };
865
866 static char *hiddev_devnode(struct device *dev, umode_t *mode)
867 {
868 return kasprintf(GFP_KERNEL, "usb/%s", dev_name(dev));
869 }
870
871 static struct usb_class_driver hiddev_class = {
872 .name = "hiddev%d",
873 .devnode = hiddev_devnode,
874 .fops = &hiddev_fops,
875 .minor_base = HIDDEV_MINOR_BASE,
876 };
877
878
879
880
881 int hiddev_connect(struct hid_device *hid, unsigned int force)
882 {
883 struct hiddev *hiddev;
884 struct usbhid_device *usbhid = hid->driver_data;
885 int retval;
886
887 if (!force) {
888 unsigned int i;
889 for (i = 0; i < hid->maxcollection; i++)
890 if (hid->collection[i].type ==
891 HID_COLLECTION_APPLICATION &&
892 !IS_INPUT_APPLICATION(hid->collection[i].usage))
893 break;
894
895 if (i == hid->maxcollection)
896 return -1;
897 }
898
899 if (!(hiddev = kzalloc(sizeof(struct hiddev), GFP_KERNEL)))
900 return -1;
901
902 init_waitqueue_head(&hiddev->wait);
903 INIT_LIST_HEAD(&hiddev->list);
904 spin_lock_init(&hiddev->list_lock);
905 mutex_init(&hiddev->existancelock);
906 hid->hiddev = hiddev;
907 hiddev->hid = hid;
908 hiddev->exist = 1;
909 retval = usb_register_dev(usbhid->intf, &hiddev_class);
910 if (retval) {
911 hid_err(hid, "Not able to get a minor for this device\n");
912 hid->hiddev = NULL;
913 kfree(hiddev);
914 return -1;
915 }
916
917
918
919
920
921 hiddev->initialized = hid->quirks & HID_QUIRK_NO_INIT_REPORTS;
922
923 hiddev->minor = usbhid->intf->minor;
924
925 return 0;
926 }
927
928
929
930
931
932 static struct usb_class_driver hiddev_class;
933 void hiddev_disconnect(struct hid_device *hid)
934 {
935 struct hiddev *hiddev = hid->hiddev;
936 struct usbhid_device *usbhid = hid->driver_data;
937
938 usb_deregister_dev(usbhid->intf, &hiddev_class);
939
940 mutex_lock(&hiddev->existancelock);
941 hiddev->exist = 0;
942
943 if (hiddev->open) {
944 hid_hw_close(hiddev->hid);
945 wake_up_interruptible(&hiddev->wait);
946 mutex_unlock(&hiddev->existancelock);
947 } else {
948 mutex_unlock(&hiddev->existancelock);
949 kfree(hiddev);
950 }
951 }