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