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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/smp_lock.h>
33#include <linux/input.h>
34#include <linux/usb.h>
35#include <linux/hid.h>
36#include <linux/hiddev.h>
37#include <linux/compat.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
70static struct hiddev *hiddev_table[HIDDEV_MINORS];
71
72
73
74
75
76
77
78static struct hid_report *
79hiddev_lookup_report(struct hid_device *hid, struct hiddev_report_info *rinfo)
80{
81 unsigned int flags = rinfo->report_id & ~HID_REPORT_ID_MASK;
82 unsigned int rid = rinfo->report_id & HID_REPORT_ID_MASK;
83 struct hid_report_enum *report_enum;
84 struct hid_report *report;
85 struct list_head *list;
86
87 if (rinfo->report_type < HID_REPORT_TYPE_MIN ||
88 rinfo->report_type > HID_REPORT_TYPE_MAX)
89 return NULL;
90
91 report_enum = hid->report_enum +
92 (rinfo->report_type - HID_REPORT_TYPE_MIN);
93
94 switch (flags) {
95 case 0:
96 break;
97
98 case HID_REPORT_ID_FIRST:
99 if (list_empty(&report_enum->report_list))
100 return NULL;
101
102 list = report_enum->report_list.next;
103 report = list_entry(list, struct hid_report, list);
104 rinfo->report_id = report->id;
105 break;
106
107 case HID_REPORT_ID_NEXT:
108 report = report_enum->report_id_hash[rid];
109 if (!report)
110 return NULL;
111
112 list = report->list.next;
113 if (list == &report_enum->report_list)
114 return NULL;
115
116 report = list_entry(list, struct hid_report, list);
117 rinfo->report_id = report->id;
118 break;
119
120 default:
121 return NULL;
122 }
123
124 return report_enum->report_id_hash[rinfo->report_id];
125}
126
127
128
129
130
131static struct hid_field *
132hiddev_lookup_usage(struct hid_device *hid, struct hiddev_usage_ref *uref)
133{
134 int i, j;
135 struct hid_report *report;
136 struct hid_report_enum *report_enum;
137 struct hid_field *field;
138
139 if (uref->report_type < HID_REPORT_TYPE_MIN ||
140 uref->report_type > HID_REPORT_TYPE_MAX)
141 return NULL;
142
143 report_enum = hid->report_enum +
144 (uref->report_type - HID_REPORT_TYPE_MIN);
145
146 list_for_each_entry(report, &report_enum->report_list, list) {
147 for (i = 0; i < report->maxfield; i++) {
148 field = report->field[i];
149 for (j = 0; j < field->maxusage; j++) {
150 if (field->usage[j].hid == uref->usage_code) {
151 uref->report_id = report->id;
152 uref->field_index = i;
153 uref->usage_index = j;
154 return field;
155 }
156 }
157 }
158 }
159
160 return NULL;
161}
162
163static void hiddev_send_event(struct hid_device *hid,
164 struct hiddev_usage_ref *uref)
165{
166 struct hiddev *hiddev = hid->hiddev;
167 struct hiddev_list *list;
168 unsigned long flags;
169
170 spin_lock_irqsave(&hiddev->list_lock, flags);
171 list_for_each_entry(list, &hiddev->list, node) {
172 if (uref->field_index != HID_FIELD_INDEX_NONE ||
173 (list->flags & HIDDEV_FLAG_REPORT) != 0) {
174 list->buffer[list->head] = *uref;
175 list->head = (list->head + 1) &
176 (HIDDEV_BUFFER_SIZE - 1);
177 kill_fasync(&list->fasync, SIGIO, POLL_IN);
178 }
179 }
180 spin_unlock_irqrestore(&hiddev->list_lock, flags);
181
182 wake_up_interruptible(&hiddev->wait);
183}
184
185
186
187
188
189void hiddev_hid_event(struct hid_device *hid, struct hid_field *field,
190 struct hid_usage *usage, __s32 value)
191{
192 unsigned type = field->report_type;
193 struct hiddev_usage_ref uref;
194
195 uref.report_type =
196 (type == HID_INPUT_REPORT) ? HID_REPORT_TYPE_INPUT :
197 ((type == HID_OUTPUT_REPORT) ? HID_REPORT_TYPE_OUTPUT :
198 ((type == HID_FEATURE_REPORT) ? HID_REPORT_TYPE_FEATURE : 0));
199 uref.report_id = field->report->id;
200 uref.field_index = field->index;
201 uref.usage_index = (usage - field->usage);
202 uref.usage_code = usage->hid;
203 uref.value = value;
204
205 hiddev_send_event(hid, &uref);
206}
207EXPORT_SYMBOL_GPL(hiddev_hid_event);
208
209void hiddev_report_event(struct hid_device *hid, struct hid_report *report)
210{
211 unsigned type = report->type;
212 struct hiddev_usage_ref uref;
213
214 memset(&uref, 0, sizeof(uref));
215 uref.report_type =
216 (type == HID_INPUT_REPORT) ? HID_REPORT_TYPE_INPUT :
217 ((type == HID_OUTPUT_REPORT) ? HID_REPORT_TYPE_OUTPUT :
218 ((type == HID_FEATURE_REPORT) ? HID_REPORT_TYPE_FEATURE : 0));
219 uref.report_id = report->id;
220 uref.field_index = HID_FIELD_INDEX_NONE;
221
222 hiddev_send_event(hid, &uref);
223}
224
225
226
227
228static int hiddev_fasync(int fd, struct file *file, int on)
229{
230 struct hiddev_list *list = file->private_data;
231
232 return fasync_helper(fd, file, on, &list->fasync);
233}
234
235
236
237
238
239static int hiddev_release(struct inode * inode, struct file * file)
240{
241 struct hiddev_list *list = file->private_data;
242 unsigned long flags;
243
244 spin_lock_irqsave(&list->hiddev->list_lock, flags);
245 list_del(&list->node);
246 spin_unlock_irqrestore(&list->hiddev->list_lock, flags);
247
248 if (!--list->hiddev->open) {
249 if (list->hiddev->exist) {
250 usbhid_close(list->hiddev->hid);
251 usbhid_put_power(list->hiddev->hid);
252 } else {
253 kfree(list->hiddev);
254 }
255 }
256
257 kfree(list);
258
259 return 0;
260}
261
262
263
264
265static int hiddev_open(struct inode *inode, struct file *file)
266{
267 struct hiddev_list *list;
268 int res;
269
270 int i = iminor(inode) - HIDDEV_MINOR_BASE;
271
272 if (i >= HIDDEV_MINORS || i < 0 || !hiddev_table[i])
273 return -ENODEV;
274
275 if (!(list = kzalloc(sizeof(struct hiddev_list), GFP_KERNEL)))
276 return -ENOMEM;
277 mutex_init(&list->thread_lock);
278
279 list->hiddev = hiddev_table[i];
280
281
282 file->private_data = list;
283
284
285
286
287
288 if (list->hiddev->exist) {
289 if (!list->hiddev->open++) {
290 res = usbhid_open(hiddev_table[i]->hid);
291 if (res < 0) {
292 res = -EIO;
293 goto bail;
294 }
295 }
296 } else {
297 res = -ENODEV;
298 goto bail;
299 }
300
301 spin_lock_irq(&list->hiddev->list_lock);
302 list_add_tail(&list->node, &hiddev_table[i]->list);
303 spin_unlock_irq(&list->hiddev->list_lock);
304
305 if (!list->hiddev->open++)
306 if (list->hiddev->exist) {
307 struct hid_device *hid = hiddev_table[i]->hid;
308 res = usbhid_get_power(hid);
309 if (res < 0) {
310 res = -EIO;
311 goto bail;
312 }
313 usbhid_open(hid);
314 }
315
316 return 0;
317bail:
318 file->private_data = NULL;
319 kfree(list);
320 return res;
321}
322
323
324
325
326static ssize_t hiddev_write(struct file * file, const char __user * buffer, size_t count, loff_t *ppos)
327{
328 return -EINVAL;
329}
330
331
332
333
334static ssize_t hiddev_read(struct file * file, char __user * buffer, size_t count, loff_t *ppos)
335{
336 DEFINE_WAIT(wait);
337 struct hiddev_list *list = file->private_data;
338 int event_size;
339 int retval;
340
341 event_size = ((list->flags & HIDDEV_FLAG_UREF) != 0) ?
342 sizeof(struct hiddev_usage_ref) : sizeof(struct hiddev_event);
343
344 if (count < event_size)
345 return 0;
346
347
348 retval = mutex_lock_interruptible(&list->thread_lock);
349 if (retval)
350 return -ERESTARTSYS;
351
352 while (retval == 0) {
353 if (list->head == list->tail) {
354 prepare_to_wait(&list->hiddev->wait, &wait, TASK_INTERRUPTIBLE);
355
356 while (list->head == list->tail) {
357 if (file->f_flags & O_NONBLOCK) {
358 retval = -EAGAIN;
359 break;
360 }
361 if (signal_pending(current)) {
362 retval = -ERESTARTSYS;
363 break;
364 }
365 if (!list->hiddev->exist) {
366 retval = -EIO;
367 break;
368 }
369
370
371 mutex_unlock(&list->thread_lock);
372 schedule();
373 if (mutex_lock_interruptible(&list->thread_lock))
374 return -EINTR;
375 set_current_state(TASK_INTERRUPTIBLE);
376 }
377 finish_wait(&list->hiddev->wait, &wait);
378
379 }
380
381 if (retval) {
382 mutex_unlock(&list->thread_lock);
383 return retval;
384 }
385
386
387 while (list->head != list->tail &&
388 retval + event_size <= count) {
389 if ((list->flags & HIDDEV_FLAG_UREF) == 0) {
390 if (list->buffer[list->tail].field_index != HID_FIELD_INDEX_NONE) {
391 struct hiddev_event event;
392
393 event.hid = list->buffer[list->tail].usage_code;
394 event.value = list->buffer[list->tail].value;
395 if (copy_to_user(buffer + retval, &event, sizeof(struct hiddev_event))) {
396 mutex_unlock(&list->thread_lock);
397 return -EFAULT;
398 }
399 retval += sizeof(struct hiddev_event);
400 }
401 } else {
402 if (list->buffer[list->tail].field_index != HID_FIELD_INDEX_NONE ||
403 (list->flags & HIDDEV_FLAG_REPORT) != 0) {
404
405 if (copy_to_user(buffer + retval, list->buffer + list->tail, sizeof(struct hiddev_usage_ref))) {
406 mutex_unlock(&list->thread_lock);
407 return -EFAULT;
408 }
409 retval += sizeof(struct hiddev_usage_ref);
410 }
411 }
412 list->tail = (list->tail + 1) & (HIDDEV_BUFFER_SIZE - 1);
413 }
414
415 }
416 mutex_unlock(&list->thread_lock);
417
418 return retval;
419}
420
421
422
423
424
425static unsigned int hiddev_poll(struct file *file, poll_table *wait)
426{
427 struct hiddev_list *list = file->private_data;
428
429 poll_wait(file, &list->hiddev->wait, wait);
430 if (list->head != list->tail)
431 return POLLIN | POLLRDNORM;
432 if (!list->hiddev->exist)
433 return POLLERR | POLLHUP;
434 return 0;
435}
436
437
438
439
440static noinline int hiddev_ioctl_usage(struct hiddev *hiddev, unsigned int cmd, void __user *user_arg)
441{
442 struct hid_device *hid = hiddev->hid;
443 struct hiddev_report_info rinfo;
444 struct hiddev_usage_ref_multi *uref_multi = NULL;
445 struct hiddev_usage_ref *uref;
446 struct hid_report *report;
447 struct hid_field *field;
448 int i;
449
450 uref_multi = kmalloc(sizeof(struct hiddev_usage_ref_multi), GFP_KERNEL);
451 if (!uref_multi)
452 return -ENOMEM;
453 lock_kernel();
454 uref = &uref_multi->uref;
455 if (cmd == HIDIOCGUSAGES || cmd == HIDIOCSUSAGES) {
456 if (copy_from_user(uref_multi, user_arg,
457 sizeof(*uref_multi)))
458 goto fault;
459 } else {
460 if (copy_from_user(uref, user_arg, sizeof(*uref)))
461 goto fault;
462 }
463
464 switch (cmd) {
465 case HIDIOCGUCODE:
466 rinfo.report_type = uref->report_type;
467 rinfo.report_id = uref->report_id;
468 if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL)
469 goto inval;
470
471 if (uref->field_index >= report->maxfield)
472 goto inval;
473
474 field = report->field[uref->field_index];
475 if (uref->usage_index >= field->maxusage)
476 goto inval;
477
478 uref->usage_code = field->usage[uref->usage_index].hid;
479
480 if (copy_to_user(user_arg, uref, sizeof(*uref)))
481 goto fault;
482
483 goto goodreturn;
484
485 default:
486 if (cmd != HIDIOCGUSAGE &&
487 cmd != HIDIOCGUSAGES &&
488 uref->report_type == HID_REPORT_TYPE_INPUT)
489 goto inval;
490
491 if (uref->report_id == HID_REPORT_ID_UNKNOWN) {
492 field = hiddev_lookup_usage(hid, uref);
493 if (field == NULL)
494 goto inval;
495 } else {
496 rinfo.report_type = uref->report_type;
497 rinfo.report_id = uref->report_id;
498 if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL)
499 goto inval;
500
501 if (uref->field_index >= report->maxfield)
502 goto inval;
503
504 field = report->field[uref->field_index];
505
506 if (cmd == HIDIOCGCOLLECTIONINDEX) {
507 if (uref->usage_index >= field->maxusage)
508 goto inval;
509 } else if (uref->usage_index >= field->report_count)
510 goto inval;
511
512 else if ((cmd == HIDIOCGUSAGES || cmd == HIDIOCSUSAGES) &&
513 (uref_multi->num_values > HID_MAX_MULTI_USAGES ||
514 uref->usage_index + uref_multi->num_values > field->report_count))
515 goto inval;
516 }
517
518 switch (cmd) {
519 case HIDIOCGUSAGE:
520 uref->value = field->value[uref->usage_index];
521 if (copy_to_user(user_arg, uref, sizeof(*uref)))
522 goto fault;
523 goto goodreturn;
524
525 case HIDIOCSUSAGE:
526 field->value[uref->usage_index] = uref->value;
527 goto goodreturn;
528
529 case HIDIOCGCOLLECTIONINDEX:
530 i = field->usage[uref->usage_index].collection_index;
531 unlock_kernel();
532 kfree(uref_multi);
533 return i;
534 case HIDIOCGUSAGES:
535 for (i = 0; i < uref_multi->num_values; i++)
536 uref_multi->values[i] =
537 field->value[uref->usage_index + i];
538 if (copy_to_user(user_arg, uref_multi,
539 sizeof(*uref_multi)))
540 goto fault;
541 goto goodreturn;
542 case HIDIOCSUSAGES:
543 for (i = 0; i < uref_multi->num_values; i++)
544 field->value[uref->usage_index + i] =
545 uref_multi->values[i];
546 goto goodreturn;
547 }
548
549goodreturn:
550 unlock_kernel();
551 kfree(uref_multi);
552 return 0;
553fault:
554 unlock_kernel();
555 kfree(uref_multi);
556 return -EFAULT;
557inval:
558 unlock_kernel();
559 kfree(uref_multi);
560 return -EINVAL;
561 }
562}
563
564static noinline int hiddev_ioctl_string(struct hiddev *hiddev, unsigned int cmd, void __user *user_arg)
565{
566 struct hid_device *hid = hiddev->hid;
567 struct usb_device *dev = hid_to_usb_dev(hid);
568 int idx, len;
569 char *buf;
570
571 if (get_user(idx, (int __user *)user_arg))
572 return -EFAULT;
573
574 if ((buf = kmalloc(HID_STRING_SIZE, GFP_KERNEL)) == NULL)
575 return -ENOMEM;
576
577 if ((len = usb_string(dev, idx, buf, HID_STRING_SIZE-1)) < 0) {
578 kfree(buf);
579 return -EINVAL;
580 }
581
582 if (copy_to_user(user_arg+sizeof(int), buf, len+1)) {
583 kfree(buf);
584 return -EFAULT;
585 }
586
587 kfree(buf);
588
589 return len;
590}
591
592static long hiddev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
593{
594 struct hiddev_list *list = file->private_data;
595 struct hiddev *hiddev = list->hiddev;
596 struct hid_device *hid = hiddev->hid;
597 struct usb_device *dev = hid_to_usb_dev(hid);
598 struct hiddev_collection_info cinfo;
599 struct hiddev_report_info rinfo;
600 struct hiddev_field_info finfo;
601 struct hiddev_devinfo dinfo;
602 struct hid_report *report;
603 struct hid_field *field;
604 struct usbhid_device *usbhid = hid->driver_data;
605 void __user *user_arg = (void __user *)arg;
606 int i, r;
607
608
609
610
611 if (!hiddev->exist)
612 return -EIO;
613
614 switch (cmd) {
615
616 case HIDIOCGVERSION:
617 return put_user(HID_VERSION, (int __user *)arg);
618
619 case HIDIOCAPPLICATION:
620 if (arg < 0 || arg >= hid->maxapplication)
621 return -EINVAL;
622
623 for (i = 0; i < hid->maxcollection; i++)
624 if (hid->collection[i].type ==
625 HID_COLLECTION_APPLICATION && arg-- == 0)
626 break;
627
628 if (i == hid->maxcollection)
629 return -EINVAL;
630
631 return hid->collection[i].usage;
632
633 case HIDIOCGDEVINFO:
634 dinfo.bustype = BUS_USB;
635 dinfo.busnum = dev->bus->busnum;
636 dinfo.devnum = dev->devnum;
637 dinfo.ifnum = usbhid->ifnum;
638 dinfo.vendor = le16_to_cpu(dev->descriptor.idVendor);
639 dinfo.product = le16_to_cpu(dev->descriptor.idProduct);
640 dinfo.version = le16_to_cpu(dev->descriptor.bcdDevice);
641 dinfo.num_applications = hid->maxapplication;
642 if (copy_to_user(user_arg, &dinfo, sizeof(dinfo)))
643 return -EFAULT;
644
645 return 0;
646
647 case HIDIOCGFLAG:
648 if (put_user(list->flags, (int __user *)arg))
649 return -EFAULT;
650
651 return 0;
652
653 case HIDIOCSFLAG:
654 {
655 int newflags;
656 if (get_user(newflags, (int __user *)arg))
657 return -EFAULT;
658
659 if ((newflags & ~HIDDEV_FLAGS) != 0 ||
660 ((newflags & HIDDEV_FLAG_REPORT) != 0 &&
661 (newflags & HIDDEV_FLAG_UREF) == 0))
662 return -EINVAL;
663
664 list->flags = newflags;
665
666 return 0;
667 }
668
669 case HIDIOCGSTRING:
670 mutex_lock(&hiddev->existancelock);
671 if (hiddev->exist)
672 r = hiddev_ioctl_string(hiddev, cmd, user_arg);
673 else
674 r = -ENODEV;
675 mutex_unlock(&hiddev->existancelock);
676 return r;
677
678 case HIDIOCINITREPORT:
679 mutex_lock(&hiddev->existancelock);
680 if (!hiddev->exist) {
681 mutex_unlock(&hiddev->existancelock);
682 return -ENODEV;
683 }
684 usbhid_init_reports(hid);
685 mutex_unlock(&hiddev->existancelock);
686
687 return 0;
688
689 case HIDIOCGREPORT:
690 if (copy_from_user(&rinfo, user_arg, sizeof(rinfo)))
691 return -EFAULT;
692
693 if (rinfo.report_type == HID_REPORT_TYPE_OUTPUT)
694 return -EINVAL;
695
696 if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL)
697 return -EINVAL;
698
699 mutex_lock(&hiddev->existancelock);
700 if (hiddev->exist) {
701 usbhid_submit_report(hid, report, USB_DIR_IN);
702 usbhid_wait_io(hid);
703 }
704 mutex_unlock(&hiddev->existancelock);
705
706 return 0;
707
708 case HIDIOCSREPORT:
709 if (copy_from_user(&rinfo, user_arg, sizeof(rinfo)))
710 return -EFAULT;
711
712 if (rinfo.report_type == HID_REPORT_TYPE_INPUT)
713 return -EINVAL;
714
715 if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL)
716 return -EINVAL;
717
718 mutex_lock(&hiddev->existancelock);
719 if (hiddev->exist) {
720 usbhid_submit_report(hid, report, USB_DIR_OUT);
721 usbhid_wait_io(hid);
722 }
723 mutex_unlock(&hiddev->existancelock);
724
725 return 0;
726
727 case HIDIOCGREPORTINFO:
728 if (copy_from_user(&rinfo, user_arg, sizeof(rinfo)))
729 return -EFAULT;
730
731 if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL)
732 return -EINVAL;
733
734 rinfo.num_fields = report->maxfield;
735
736 if (copy_to_user(user_arg, &rinfo, sizeof(rinfo)))
737 return -EFAULT;
738
739 return 0;
740
741 case HIDIOCGFIELDINFO:
742 if (copy_from_user(&finfo, user_arg, sizeof(finfo)))
743 return -EFAULT;
744 rinfo.report_type = finfo.report_type;
745 rinfo.report_id = finfo.report_id;
746 if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL)
747 return -EINVAL;
748
749 if (finfo.field_index >= report->maxfield)
750 return -EINVAL;
751
752 field = report->field[finfo.field_index];
753 memset(&finfo, 0, sizeof(finfo));
754 finfo.report_type = rinfo.report_type;
755 finfo.report_id = rinfo.report_id;
756 finfo.field_index = field->report_count - 1;
757 finfo.maxusage = field->maxusage;
758 finfo.flags = field->flags;
759 finfo.physical = field->physical;
760 finfo.logical = field->logical;
761 finfo.application = field->application;
762 finfo.logical_minimum = field->logical_minimum;
763 finfo.logical_maximum = field->logical_maximum;
764 finfo.physical_minimum = field->physical_minimum;
765 finfo.physical_maximum = field->physical_maximum;
766 finfo.unit_exponent = field->unit_exponent;
767 finfo.unit = field->unit;
768
769 if (copy_to_user(user_arg, &finfo, sizeof(finfo)))
770 return -EFAULT;
771
772 return 0;
773
774 case HIDIOCGUCODE:
775
776 case HIDIOCGUSAGE:
777 case HIDIOCSUSAGE:
778 case HIDIOCGUSAGES:
779 case HIDIOCSUSAGES:
780 case HIDIOCGCOLLECTIONINDEX:
781 mutex_lock(&hiddev->existancelock);
782 if (hiddev->exist)
783 r = hiddev_ioctl_usage(hiddev, cmd, user_arg);
784 else
785 r = -ENODEV;
786 mutex_unlock(&hiddev->existancelock);
787 return r;
788
789 case HIDIOCGCOLLECTIONINFO:
790 if (copy_from_user(&cinfo, user_arg, sizeof(cinfo)))
791 return -EFAULT;
792
793 if (cinfo.index >= hid->maxcollection)
794 return -EINVAL;
795
796 cinfo.type = hid->collection[cinfo.index].type;
797 cinfo.usage = hid->collection[cinfo.index].usage;
798 cinfo.level = hid->collection[cinfo.index].level;
799
800 if (copy_to_user(user_arg, &cinfo, sizeof(cinfo)))
801 return -EFAULT;
802 return 0;
803
804 default:
805
806 if (_IOC_TYPE(cmd) != 'H' || _IOC_DIR(cmd) != _IOC_READ)
807 return -EINVAL;
808
809 if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGNAME(0))) {
810 int len;
811 if (!hid->name)
812 return 0;
813 len = strlen(hid->name) + 1;
814 if (len > _IOC_SIZE(cmd))
815 len = _IOC_SIZE(cmd);
816 return copy_to_user(user_arg, hid->name, len) ?
817 -EFAULT : len;
818 }
819
820 if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGPHYS(0))) {
821 int len;
822 if (!hid->phys)
823 return 0;
824 len = strlen(hid->phys) + 1;
825 if (len > _IOC_SIZE(cmd))
826 len = _IOC_SIZE(cmd);
827 return copy_to_user(user_arg, hid->phys, len) ?
828 -EFAULT : len;
829 }
830 }
831 return -EINVAL;
832}
833
834#ifdef CONFIG_COMPAT
835static long hiddev_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
836{
837 return hiddev_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
838}
839#endif
840
841static const struct file_operations hiddev_fops = {
842 .owner = THIS_MODULE,
843 .read = hiddev_read,
844 .write = hiddev_write,
845 .poll = hiddev_poll,
846 .open = hiddev_open,
847 .release = hiddev_release,
848 .unlocked_ioctl = hiddev_ioctl,
849 .fasync = hiddev_fasync,
850#ifdef CONFIG_COMPAT
851 .compat_ioctl = hiddev_compat_ioctl,
852#endif
853};
854
855static char *hiddev_devnode(struct device *dev, mode_t *mode)
856{
857 return kasprintf(GFP_KERNEL, "usb/%s", dev_name(dev));
858}
859
860static struct usb_class_driver hiddev_class = {
861 .name = "hiddev%d",
862 .devnode = hiddev_devnode,
863 .fops = &hiddev_fops,
864 .minor_base = HIDDEV_MINOR_BASE,
865};
866
867
868
869
870int hiddev_connect(struct hid_device *hid, unsigned int force)
871{
872 struct hiddev *hiddev;
873 struct usbhid_device *usbhid = hid->driver_data;
874 int retval;
875
876 if (!force) {
877 unsigned int i;
878 for (i = 0; i < hid->maxcollection; i++)
879 if (hid->collection[i].type ==
880 HID_COLLECTION_APPLICATION &&
881 !IS_INPUT_APPLICATION(hid->collection[i].usage))
882 break;
883
884 if (i == hid->maxcollection)
885 return -1;
886 }
887
888 if (!(hiddev = kzalloc(sizeof(struct hiddev), GFP_KERNEL)))
889 return -1;
890
891 init_waitqueue_head(&hiddev->wait);
892 INIT_LIST_HEAD(&hiddev->list);
893 spin_lock_init(&hiddev->list_lock);
894 mutex_init(&hiddev->existancelock);
895 hid->hiddev = hiddev;
896 hiddev->hid = hid;
897 hiddev->exist = 1;
898
899
900
901 lock_kernel();
902 retval = usb_register_dev(usbhid->intf, &hiddev_class);
903 if (retval) {
904 err_hid("Not able to get a minor for this device.");
905 hid->hiddev = NULL;
906 unlock_kernel();
907 kfree(hiddev);
908 return -1;
909 } else {
910 hid->minor = usbhid->intf->minor;
911 hiddev_table[usbhid->intf->minor - HIDDEV_MINOR_BASE] = hiddev;
912 }
913 unlock_kernel();
914
915 return 0;
916}
917
918
919
920
921
922static struct usb_class_driver hiddev_class;
923void hiddev_disconnect(struct hid_device *hid)
924{
925 struct hiddev *hiddev = hid->hiddev;
926 struct usbhid_device *usbhid = hid->driver_data;
927
928 mutex_lock(&hiddev->existancelock);
929 hiddev->exist = 0;
930 mutex_unlock(&hiddev->existancelock);
931
932 hiddev_table[hiddev->hid->minor - HIDDEV_MINOR_BASE] = NULL;
933 usb_deregister_dev(usbhid->intf, &hiddev_class);
934
935 if (hiddev->open) {
936 usbhid_close(hiddev->hid);
937 wake_up_interruptible(&hiddev->wait);
938 } else {
939 kfree(hiddev);
940 }
941}
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960static int hiddev_usbd_probe(struct usb_interface *intf,
961 const struct usb_device_id *hiddev_info)
962{
963 return -ENODEV;
964}
965
966static struct usb_driver hiddev_driver = {
967 .name = "hiddev",
968 .probe = hiddev_usbd_probe,
969};
970
971int __init hiddev_init(void)
972{
973 return usb_register(&hiddev_driver);
974}
975
976void hiddev_exit(void)
977{
978 usb_deregister(&hiddev_driver);
979}
980