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Merge tag 'v3.3.7' into 3.3/master
[zen-stable.git] / drivers / hid / usbhid / hiddev.c
blobb1ec0e2aeb57b0b26a66e17b067192cfc30689c1
1 /*
2 * Copyright (c) 2001 Paul Stewart
3 * Copyright (c) 2001 Vojtech Pavlik
4 *
5 * HID char devices, giving access to raw HID device events.
6 *
7 */
8
9 /*
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 *
24 * Should you need to contact me, the author, you can do so either by
25 * e-mail - mail your message to Paul Stewart <stewart@wetlogic.net>
26 */
27
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 "usbhid.h"
38
39 #ifdef CONFIG_USB_DYNAMIC_MINORS
40 #define HIDDEV_MINOR_BASE 0
41 #define HIDDEV_MINORS 256
42 #else
43 #define HIDDEV_MINOR_BASE 96
44 #define HIDDEV_MINORS 16
45 #endif
46 #define HIDDEV_BUFFER_SIZE 2048
47
48 struct hiddev {
49 int exist;
50 int open;
51 struct mutex existancelock;
52 wait_queue_head_t wait;
53 struct hid_device *hid;
54 struct list_head list;
55 spinlock_t list_lock;
56 };
57
58 struct hiddev_list {
59 struct hiddev_usage_ref buffer[HIDDEV_BUFFER_SIZE];
60 int head;
61 int tail;
62 unsigned flags;
63 struct fasync_struct *fasync;
64 struct hiddev *hiddev;
65 struct list_head node;
66 struct mutex thread_lock;
67 };
68
69 /*
70 * Find a report, given the report's type and ID. The ID can be specified
71 * indirectly by REPORT_ID_FIRST (which returns the first report of the given
72 * type) or by (REPORT_ID_NEXT | old_id), which returns the next report of the
73 * given type which follows old_id.
74 */
75 static struct hid_report *
76 hiddev_lookup_report(struct hid_device *hid, struct hiddev_report_info *rinfo)
77 {
78 unsigned int flags = rinfo->report_id & ~HID_REPORT_ID_MASK;
79 unsigned int rid = rinfo->report_id & HID_REPORT_ID_MASK;
80 struct hid_report_enum *report_enum;
81 struct hid_report *report;
82 struct list_head *list;
83
84 if (rinfo->report_type < HID_REPORT_TYPE_MIN ||
85 rinfo->report_type > HID_REPORT_TYPE_MAX)
86 return NULL;
87
88 report_enum = hid->report_enum +
89 (rinfo->report_type - HID_REPORT_TYPE_MIN);
90
91 switch (flags) {
92 case 0: /* Nothing to do -- report_id is already set correctly */
93 break;
94
95 case HID_REPORT_ID_FIRST:
96 if (list_empty(&report_enum->report_list))
97 return NULL;
98
99 list = report_enum->report_list.next;
100 report = list_entry(list, struct hid_report, list);
101 rinfo->report_id = report->id;
102 break;
103
104 case HID_REPORT_ID_NEXT:
105 report = report_enum->report_id_hash[rid];
106 if (!report)
107 return NULL;
108
109 list = report->list.next;
110 if (list == &report_enum->report_list)
111 return NULL;
112
113 report = list_entry(list, struct hid_report, list);
114 rinfo->report_id = report->id;
115 break;
116
117 default:
118 return NULL;
119 }
120
121 return report_enum->report_id_hash[rinfo->report_id];
122 }
123
124 /*
125 * Perform an exhaustive search of the report table for a usage, given its
126 * type and usage id.
127 */
128 static struct hid_field *
129 hiddev_lookup_usage(struct hid_device *hid, struct hiddev_usage_ref *uref)
130 {
131 int i, j;
132 struct hid_report *report;
133 struct hid_report_enum *report_enum;
134 struct hid_field *field;
135
136 if (uref->report_type < HID_REPORT_TYPE_MIN ||
137 uref->report_type > HID_REPORT_TYPE_MAX)
138 return NULL;
139
140 report_enum = hid->report_enum +
141 (uref->report_type - HID_REPORT_TYPE_MIN);
142
143 list_for_each_entry(report, &report_enum->report_list, list) {
144 for (i = 0; i < report->maxfield; i++) {
145 field = report->field[i];
146 for (j = 0; j < field->maxusage; j++) {
147 if (field->usage[j].hid == uref->usage_code) {
148 uref->report_id = report->id;
149 uref->field_index = i;
150 uref->usage_index = j;
151 return field;
152 }
153 }
154 }
155 }
156
157 return NULL;
158 }
159
160 static void hiddev_send_event(struct hid_device *hid,
161 struct hiddev_usage_ref *uref)
162 {
163 struct hiddev *hiddev = hid->hiddev;
164 struct hiddev_list *list;
165 unsigned long flags;
166
167 spin_lock_irqsave(&hiddev->list_lock, flags);
168 list_for_each_entry(list, &hiddev->list, node) {
169 if (uref->field_index != HID_FIELD_INDEX_NONE ||
170 (list->flags & HIDDEV_FLAG_REPORT) != 0) {
171 list->buffer[list->head] = *uref;
172 list->head = (list->head + 1) &
173 (HIDDEV_BUFFER_SIZE - 1);
174 kill_fasync(&list->fasync, SIGIO, POLL_IN);
175 }
176 }
177 spin_unlock_irqrestore(&hiddev->list_lock, flags);
178
179 wake_up_interruptible(&hiddev->wait);
180 }
181
182 /*
183 * This is where hid.c calls into hiddev to pass an event that occurred over
184 * the interrupt pipe
185 */
186 void hiddev_hid_event(struct hid_device *hid, struct hid_field *field,
187 struct hid_usage *usage, __s32 value)
188 {
189 unsigned type = field->report_type;
190 struct hiddev_usage_ref uref;
191
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 = field->report->id;
197 uref.field_index = field->index;
198 uref.usage_index = (usage - field->usage);
199 uref.usage_code = usage->hid;
200 uref.value = value;
201
202 hiddev_send_event(hid, &uref);
203 }
204 EXPORT_SYMBOL_GPL(hiddev_hid_event);
205
206 void hiddev_report_event(struct hid_device *hid, struct hid_report *report)
207 {
208 unsigned type = report->type;
209 struct hiddev_usage_ref uref;
210
211 memset(&uref, 0, sizeof(uref));
212 uref.report_type =
213 (type == HID_INPUT_REPORT) ? HID_REPORT_TYPE_INPUT :
214 ((type == HID_OUTPUT_REPORT) ? HID_REPORT_TYPE_OUTPUT :
215 ((type == HID_FEATURE_REPORT) ? HID_REPORT_TYPE_FEATURE : 0));
216 uref.report_id = report->id;
217 uref.field_index = HID_FIELD_INDEX_NONE;
218
219 hiddev_send_event(hid, &uref);
220 }
221
222 /*
223 * fasync file op
224 */
225 static int hiddev_fasync(int fd, struct file *file, int on)
226 {
227 struct hiddev_list *list = file->private_data;
228
229 return fasync_helper(fd, file, on, &list->fasync);
230 }
231
232
233 /*
234 * release file op
235 */
236 static int hiddev_release(struct inode * inode, struct file * file)
237 {
238 struct hiddev_list *list = file->private_data;
239 unsigned long flags;
240
241 spin_lock_irqsave(&list->hiddev->list_lock, flags);
242 list_del(&list->node);
243 spin_unlock_irqrestore(&list->hiddev->list_lock, flags);
244
245 mutex_lock(&list->hiddev->existancelock);
246 if (!--list->hiddev->open) {
247 if (list->hiddev->exist) {
248 usbhid_close(list->hiddev->hid);
249 usbhid_put_power(list->hiddev->hid);
250 } else {
251 mutex_unlock(&list->hiddev->existancelock);
252 kfree(list->hiddev);
253 kfree(list);
254 return 0;
255 }
256 }
257
258 mutex_unlock(&list->hiddev->existancelock);
259 kfree(list);
260
261 return 0;
262 }
263
264 /*
265 * open file op
266 */
267 static int hiddev_open(struct inode *inode, struct file *file)
268 {
269 struct hiddev_list *list;
270 struct usb_interface *intf;
271 struct hid_device *hid;
272 struct hiddev *hiddev;
273 int res;
274
275 intf = usbhid_find_interface(iminor(inode));
276 if (!intf)
277 return -ENODEV;
278 hid = usb_get_intfdata(intf);
279 hiddev = hid->hiddev;
280
281 if (!(list = kzalloc(sizeof(struct hiddev_list), GFP_KERNEL)))
282 return -ENOMEM;
283 mutex_init(&list->thread_lock);
284 list->hiddev = hiddev;
285 file->private_data = list;
286
287 /*
288 * no need for locking because the USB major number
289 * is shared which usbcore guards against disconnect
290 */
291 if (list->hiddev->exist) {
292 if (!list->hiddev->open++) {
293 res = usbhid_open(hiddev->hid);
294 if (res < 0) {
295 res = -EIO;
296 goto bail;
297 }
298 }
299 } else {
300 res = -ENODEV;
301 goto bail;
302 }
303
304 spin_lock_irq(&list->hiddev->list_lock);
305 list_add_tail(&list->node, &hiddev->list);
306 spin_unlock_irq(&list->hiddev->list_lock);
307
308 mutex_lock(&hiddev->existancelock);
309 if (!list->hiddev->open++)
310 if (list->hiddev->exist) {
311 struct hid_device *hid = hiddev->hid;
312 res = usbhid_get_power(hid);
313 if (res < 0) {
314 res = -EIO;
315 goto bail_unlock;
316 }
317 usbhid_open(hid);
318 }
319 mutex_unlock(&hiddev->existancelock);
320 return 0;
321 bail_unlock:
322 mutex_unlock(&hiddev->existancelock);
323 bail:
324 file->private_data = NULL;
325 kfree(list);
326 return res;
327 }
328
329 /*
330 * "write" file op
331 */
332 static ssize_t hiddev_write(struct file * file, const char __user * buffer, size_t count, loff_t *ppos)
333 {
334 return -EINVAL;
335 }
336
337 /*
338 * "read" file op
339 */
340 static ssize_t hiddev_read(struct file * file, char __user * buffer, size_t count, loff_t *ppos)
341 {
342 DEFINE_WAIT(wait);
343 struct hiddev_list *list = file->private_data;
344 int event_size;
345 int retval;
346
347 event_size = ((list->flags & HIDDEV_FLAG_UREF) != 0) ?
348 sizeof(struct hiddev_usage_ref) : sizeof(struct hiddev_event);
349
350 if (count < event_size)
351 return 0;
352
353 /* lock against other threads */
354 retval = mutex_lock_interruptible(&list->thread_lock);
355 if (retval)
356 return -ERESTARTSYS;
357
358 while (retval == 0) {
359 if (list->head == list->tail) {
360 prepare_to_wait(&list->hiddev->wait, &wait, TASK_INTERRUPTIBLE);
361
362 while (list->head == list->tail) {
363 if (file->f_flags & O_NONBLOCK) {
364 retval = -EAGAIN;
365 break;
366 }
367 if (signal_pending(current)) {
368 retval = -ERESTARTSYS;
369 break;
370 }
371 if (!list->hiddev->exist) {
372 retval = -EIO;
373 break;
374 }
375
376 /* let O_NONBLOCK tasks run */
377 mutex_unlock(&list->thread_lock);
378 schedule();
379 if (mutex_lock_interruptible(&list->thread_lock)) {
380 finish_wait(&list->hiddev->wait, &wait);
381 return -EINTR;
382 }
383 set_current_state(TASK_INTERRUPTIBLE);
384 }
385 finish_wait(&list->hiddev->wait, &wait);
386
387 }
388
389 if (retval) {
390 mutex_unlock(&list->thread_lock);
391 return retval;
392 }
393
394
395 while (list->head != list->tail &&
396 retval + event_size <= count) {
397 if ((list->flags & HIDDEV_FLAG_UREF) == 0) {
398 if (list->buffer[list->tail].field_index != HID_FIELD_INDEX_NONE) {
399 struct hiddev_event event;
400
401 event.hid = list->buffer[list->tail].usage_code;
402 event.value = list->buffer[list->tail].value;
403 if (copy_to_user(buffer + retval, &event, sizeof(struct hiddev_event))) {
404 mutex_unlock(&list->thread_lock);
405 return -EFAULT;
406 }
407 retval += sizeof(struct hiddev_event);
408 }
409 } else {
410 if (list->buffer[list->tail].field_index != HID_FIELD_INDEX_NONE ||
411 (list->flags & HIDDEV_FLAG_REPORT) != 0) {
412
413 if (copy_to_user(buffer + retval, list->buffer + list->tail, sizeof(struct hiddev_usage_ref))) {
414 mutex_unlock(&list->thread_lock);
415 return -EFAULT;
416 }
417 retval += sizeof(struct hiddev_usage_ref);
418 }
419 }
420 list->tail = (list->tail + 1) & (HIDDEV_BUFFER_SIZE - 1);
421 }
422
423 }
424 mutex_unlock(&list->thread_lock);
425
426 return retval;
427 }
428
429 /*
430 * "poll" file op
431 * No kernel lock - fine
432 */
433 static unsigned int hiddev_poll(struct file *file, poll_table *wait)
434 {
435 struct hiddev_list *list = file->private_data;
436
437 poll_wait(file, &list->hiddev->wait, wait);
438 if (list->head != list->tail)
439 return POLLIN | POLLRDNORM;
440 if (!list->hiddev->exist)
441 return POLLERR | POLLHUP;
442 return 0;
443 }
444
445 /*
446 * "ioctl" file op
447 */
448 static noinline int hiddev_ioctl_usage(struct hiddev *hiddev, unsigned int cmd, void __user *user_arg)
449 {
450 struct hid_device *hid = hiddev->hid;
451 struct hiddev_report_info rinfo;
452 struct hiddev_usage_ref_multi *uref_multi = NULL;
453 struct hiddev_usage_ref *uref;
454 struct hid_report *report;
455 struct hid_field *field;
456 int i;
457
458 uref_multi = kmalloc(sizeof(struct hiddev_usage_ref_multi), GFP_KERNEL);
459 if (!uref_multi)
460 return -ENOMEM;
461 uref = &uref_multi->uref;
462 if (cmd == HIDIOCGUSAGES || cmd == HIDIOCSUSAGES) {
463 if (copy_from_user(uref_multi, user_arg,
464 sizeof(*uref_multi)))
465 goto fault;
466 } else {
467 if (copy_from_user(uref, user_arg, sizeof(*uref)))
468 goto fault;
469 }
470
471 switch (cmd) {
472 case HIDIOCGUCODE:
473 rinfo.report_type = uref->report_type;
474 rinfo.report_id = uref->report_id;
475 if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL)
476 goto inval;
477
478 if (uref->field_index >= report->maxfield)
479 goto inval;
480
481 field = report->field[uref->field_index];
482 if (uref->usage_index >= field->maxusage)
483 goto inval;
484
485 uref->usage_code = field->usage[uref->usage_index].hid;
486
487 if (copy_to_user(user_arg, uref, sizeof(*uref)))
488 goto fault;
489
490 goto goodreturn;
491
492 default:
493 if (cmd != HIDIOCGUSAGE &&
494 cmd != HIDIOCGUSAGES &&
495 uref->report_type == HID_REPORT_TYPE_INPUT)
496 goto inval;
497
498 if (uref->report_id == HID_REPORT_ID_UNKNOWN) {
499 field = hiddev_lookup_usage(hid, uref);
500 if (field == NULL)
501 goto inval;
502 } else {
503 rinfo.report_type = uref->report_type;
504 rinfo.report_id = uref->report_id;
505 if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL)
506 goto inval;
507
508 if (uref->field_index >= report->maxfield)
509 goto inval;
510
511 field = report->field[uref->field_index];
512
513 if (cmd == HIDIOCGCOLLECTIONINDEX) {
514 if (uref->usage_index >= field->maxusage)
515 goto inval;
516 } else if (uref->usage_index >= field->report_count)
517 goto inval;
518
519 else if ((cmd == HIDIOCGUSAGES || cmd == HIDIOCSUSAGES) &&
520 (uref_multi->num_values > HID_MAX_MULTI_USAGES ||
521 uref->usage_index + uref_multi->num_values > field->report_count))
522 goto inval;
523 }
524
525 switch (cmd) {
526 case HIDIOCGUSAGE:
527 uref->value = field->value[uref->usage_index];
528 if (copy_to_user(user_arg, uref, sizeof(*uref)))
529 goto fault;
530 goto goodreturn;
531
532 case HIDIOCSUSAGE:
533 field->value[uref->usage_index] = uref->value;
534 goto goodreturn;
535
536 case HIDIOCGCOLLECTIONINDEX:
537 i = field->usage[uref->usage_index].collection_index;
538 kfree(uref_multi);
539 return i;
540 case HIDIOCGUSAGES:
541 for (i = 0; i < uref_multi->num_values; i++)
542 uref_multi->values[i] =
543 field->value[uref->usage_index + i];
544 if (copy_to_user(user_arg, uref_multi,
545 sizeof(*uref_multi)))
546 goto fault;
547 goto goodreturn;
548 case HIDIOCSUSAGES:
549 for (i = 0; i < uref_multi->num_values; i++)
550 field->value[uref->usage_index + i] =
551 uref_multi->values[i];
552 goto goodreturn;
553 }
554
555 goodreturn:
556 kfree(uref_multi);
557 return 0;
558 fault:
559 kfree(uref_multi);
560 return -EFAULT;
561 inval:
562 kfree(uref_multi);
563 return -EINVAL;
564 }
565 }
566
567 static noinline int hiddev_ioctl_string(struct hiddev *hiddev, unsigned int cmd, void __user *user_arg)
568 {
569 struct hid_device *hid = hiddev->hid;
570 struct usb_device *dev = hid_to_usb_dev(hid);
571 int idx, len;
572 char *buf;
573
574 if (get_user(idx, (int __user *)user_arg))
575 return -EFAULT;
576
577 if ((buf = kmalloc(HID_STRING_SIZE, GFP_KERNEL)) == NULL)
578 return -ENOMEM;
579
580 if ((len = usb_string(dev, idx, buf, HID_STRING_SIZE-1)) < 0) {
581 kfree(buf);
582 return -EINVAL;
583 }
584
585 if (copy_to_user(user_arg+sizeof(int), buf, len+1)) {
586 kfree(buf);
587 return -EFAULT;
588 }
589
590 kfree(buf);
591
592 return len;
593 }
594
595 static long hiddev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
596 {
597 struct hiddev_list *list = file->private_data;
598 struct hiddev *hiddev = list->hiddev;
599 struct hid_device *hid;
600 struct hiddev_collection_info cinfo;
601 struct hiddev_report_info rinfo;
602 struct hiddev_field_info finfo;
603 struct hiddev_devinfo dinfo;
604 struct hid_report *report;
605 struct hid_field *field;
606 void __user *user_arg = (void __user *)arg;
607 int i, r = -EINVAL;
608
609 /* Called without BKL by compat methods so no BKL taken */
610
611 mutex_lock(&hiddev->existancelock);
612 if (!hiddev->exist) {
613 r = -ENODEV;
614 goto ret_unlock;
615 }
616
617 hid = hiddev->hid;
618
619 switch (cmd) {
620
621 case HIDIOCGVERSION:
622 r = put_user(HID_VERSION, (int __user *)arg) ?
623 -EFAULT : 0;
624 break;
625
626 case HIDIOCAPPLICATION:
627 if (arg < 0 || arg >= hid->maxapplication)
628 break;
629
630 for (i = 0; i < hid->maxcollection; i++)
631 if (hid->collection[i].type ==
632 HID_COLLECTION_APPLICATION && arg-- == 0)
633 break;
634
635 if (i < hid->maxcollection)
636 r = hid->collection[i].usage;
637 break;
638
639 case HIDIOCGDEVINFO:
640 {
641 struct usb_device *dev = hid_to_usb_dev(hid);
642 struct usbhid_device *usbhid = hid->driver_data;
643
644 memset(&dinfo, 0, sizeof(dinfo));
645
646 dinfo.bustype = BUS_USB;
647 dinfo.busnum = dev->bus->busnum;
648 dinfo.devnum = dev->devnum;
649 dinfo.ifnum = usbhid->ifnum;
650 dinfo.vendor = le16_to_cpu(dev->descriptor.idVendor);
651 dinfo.product = le16_to_cpu(dev->descriptor.idProduct);
652 dinfo.version = le16_to_cpu(dev->descriptor.bcdDevice);
653 dinfo.num_applications = hid->maxapplication;
654
655 r = copy_to_user(user_arg, &dinfo, sizeof(dinfo)) ?
656 -EFAULT : 0;
657 break;
658 }
659
660 case HIDIOCGFLAG:
661 r = put_user(list->flags, (int __user *)arg) ?
662 -EFAULT : 0;
663 break;
664
665 case HIDIOCSFLAG:
666 {
667 int newflags;
668
669 if (get_user(newflags, (int __user *)arg)) {
670 r = -EFAULT;
671 break;
672 }
673
674 if ((newflags & ~HIDDEV_FLAGS) != 0 ||
675 ((newflags & HIDDEV_FLAG_REPORT) != 0 &&
676 (newflags & HIDDEV_FLAG_UREF) == 0))
677 break;
678
679 list->flags = newflags;
680
681 r = 0;
682 break;
683 }
684
685 case HIDIOCGSTRING:
686 r = hiddev_ioctl_string(hiddev, cmd, user_arg);
687 break;
688
689 case HIDIOCINITREPORT:
690 usbhid_init_reports(hid);
691 r = 0;
692 break;
693
694 case HIDIOCGREPORT:
695 if (copy_from_user(&rinfo, user_arg, sizeof(rinfo))) {
696 r = -EFAULT;
697 break;
698 }
699
700 if (rinfo.report_type == HID_REPORT_TYPE_OUTPUT)
701 break;
702
703 report = hiddev_lookup_report(hid, &rinfo);
704 if (report == NULL)
705 break;
706
707 usbhid_submit_report(hid, report, USB_DIR_IN);
708 usbhid_wait_io(hid);
709
710 r = 0;
711 break;
712
713 case HIDIOCSREPORT:
714 if (copy_from_user(&rinfo, user_arg, sizeof(rinfo))) {
715 r = -EFAULT;
716 break;
717 }
718
719 if (rinfo.report_type == HID_REPORT_TYPE_INPUT)
720 break;
721
722 report = hiddev_lookup_report(hid, &rinfo);
723 if (report == NULL)
724 break;
725
726 usbhid_submit_report(hid, report, USB_DIR_OUT);
727 usbhid_wait_io(hid);
728
729 r = 0;
730 break;
731
732 case HIDIOCGREPORTINFO:
733 if (copy_from_user(&rinfo, user_arg, sizeof(rinfo))) {
734 r = -EFAULT;
735 break;
736 }
737
738 report = hiddev_lookup_report(hid, &rinfo);
739 if (report == NULL)
740 break;
741
742 rinfo.num_fields = report->maxfield;
743
744 r = copy_to_user(user_arg, &rinfo, sizeof(rinfo)) ?
745 -EFAULT : 0;
746 break;
747
748 case HIDIOCGFIELDINFO:
749 if (copy_from_user(&finfo, user_arg, sizeof(finfo))) {
750 r = -EFAULT;
751 break;
752 }
753
754 rinfo.report_type = finfo.report_type;
755 rinfo.report_id = finfo.report_id;
756
757 report = hiddev_lookup_report(hid, &rinfo);
758 if (report == NULL)
759 break;
760
761 if (finfo.field_index >= report->maxfield)
762 break;
763
764 field = report->field[finfo.field_index];
765 memset(&finfo, 0, sizeof(finfo));
766 finfo.report_type = rinfo.report_type;
767 finfo.report_id = rinfo.report_id;
768 finfo.field_index = field->report_count - 1;
769 finfo.maxusage = field->maxusage;
770 finfo.flags = field->flags;
771 finfo.physical = field->physical;
772 finfo.logical = field->logical;
773 finfo.application = field->application;
774 finfo.logical_minimum = field->logical_minimum;
775 finfo.logical_maximum = field->logical_maximum;
776 finfo.physical_minimum = field->physical_minimum;
777 finfo.physical_maximum = field->physical_maximum;
778 finfo.unit_exponent = field->unit_exponent;
779 finfo.unit = field->unit;
780
781 r = copy_to_user(user_arg, &finfo, sizeof(finfo)) ?
782 -EFAULT : 0;
783 break;
784
785 case HIDIOCGUCODE:
786 /* fall through */
787 case HIDIOCGUSAGE:
788 case HIDIOCSUSAGE:
789 case HIDIOCGUSAGES:
790 case HIDIOCSUSAGES:
791 case HIDIOCGCOLLECTIONINDEX:
792 r = hiddev_ioctl_usage(hiddev, cmd, user_arg);
793 break;
794
795 case HIDIOCGCOLLECTIONINFO:
796 if (copy_from_user(&cinfo, user_arg, sizeof(cinfo))) {
797 r = -EFAULT;
798 break;
799 }
800
801 if (cinfo.index >= hid->maxcollection)
802 break;
803
804 cinfo.type = hid->collection[cinfo.index].type;
805 cinfo.usage = hid->collection[cinfo.index].usage;
806 cinfo.level = hid->collection[cinfo.index].level;
807
808 r = copy_to_user(user_arg, &cinfo, sizeof(cinfo)) ?
809 -EFAULT : 0;
810 break;
811
812 default:
813 if (_IOC_TYPE(cmd) != 'H' || _IOC_DIR(cmd) != _IOC_READ)
814 break;
815
816 if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGNAME(0))) {
817 int len = strlen(hid->name) + 1;
818 if (len > _IOC_SIZE(cmd))
819 len = _IOC_SIZE(cmd);
820 r = copy_to_user(user_arg, hid->name, len) ?
821 -EFAULT : len;
822 break;
823 }
824
825 if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGPHYS(0))) {
826 int len = strlen(hid->phys) + 1;
827 if (len > _IOC_SIZE(cmd))
828 len = _IOC_SIZE(cmd);
829 r = copy_to_user(user_arg, hid->phys, len) ?
830 -EFAULT : len;
831 break;
832 }
833 }
834
835 ret_unlock:
836 mutex_unlock(&hiddev->existancelock);
837 return r;
838 }
839
840 #ifdef CONFIG_COMPAT
841 static long hiddev_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
842 {
843 return hiddev_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
844 }
845 #endif
846
847 static const struct file_operations hiddev_fops = {
848 .owner = THIS_MODULE,
849 .read = hiddev_read,
850 .write = hiddev_write,
851 .poll = hiddev_poll,
852 .open = hiddev_open,
853 .release = hiddev_release,
854 .unlocked_ioctl = hiddev_ioctl,
855 .fasync = hiddev_fasync,
856 #ifdef CONFIG_COMPAT
857 .compat_ioctl = hiddev_compat_ioctl,
858 #endif
859 .llseek = noop_llseek,
860 };
861
862 static char *hiddev_devnode(struct device *dev, umode_t *mode)
863 {
864 return kasprintf(GFP_KERNEL, "usb/%s", dev_name(dev));
865 }
866
867 static struct usb_class_driver hiddev_class = {
868 .name = "hiddev%d",
869 .devnode = hiddev_devnode,
870 .fops = &hiddev_fops,
871 .minor_base = HIDDEV_MINOR_BASE,
872 };
873
874 /*
875 * This is where hid.c calls us to connect a hid device to the hiddev driver
876 */
877 int hiddev_connect(struct hid_device *hid, unsigned int force)
878 {
879 struct hiddev *hiddev;
880 struct usbhid_device *usbhid = hid->driver_data;
881 int retval;
882
883 if (!force) {
884 unsigned int i;
885 for (i = 0; i < hid->maxcollection; i++)
886 if (hid->collection[i].type ==
887 HID_COLLECTION_APPLICATION &&
888 !IS_INPUT_APPLICATION(hid->collection[i].usage))
889 break;
890
891 if (i == hid->maxcollection)
892 return -1;
893 }
894
895 if (!(hiddev = kzalloc(sizeof(struct hiddev), GFP_KERNEL)))
896 return -1;
897
898 init_waitqueue_head(&hiddev->wait);
899 INIT_LIST_HEAD(&hiddev->list);
900 spin_lock_init(&hiddev->list_lock);
901 mutex_init(&hiddev->existancelock);
902 hid->hiddev = hiddev;
903 hiddev->hid = hid;
904 hiddev->exist = 1;
905 retval = usb_register_dev(usbhid->intf, &hiddev_class);
906 if (retval) {
907 hid_err(hid, "Not able to get a minor for this device\n");
908 hid->hiddev = NULL;
909 kfree(hiddev);
910 return -1;
911 }
912 return 0;
913 }
914
915 /*
916 * This is where hid.c calls us to disconnect a hiddev device from the
917 * corresponding hid device (usually because the usb device has disconnected)
918 */
919 static struct usb_class_driver hiddev_class;
920 void hiddev_disconnect(struct hid_device *hid)
921 {
922 struct hiddev *hiddev = hid->hiddev;
923 struct usbhid_device *usbhid = hid->driver_data;
924
925 usb_deregister_dev(usbhid->intf, &hiddev_class);
926
927 mutex_lock(&hiddev->existancelock);
928 hiddev->exist = 0;
929
930 if (hiddev->open) {
931 mutex_unlock(&hiddev->existancelock);
932 usbhid_close(hiddev->hid);
933 wake_up_interruptible(&hiddev->wait);
934 } else {
935 mutex_unlock(&hiddev->existancelock);
936 kfree(hiddev);
937 }
938 }