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Linux 4.19.133
[linux/fpc-iii.git] / drivers / hid / usbhid / hiddev.c
blobc34ef95d7cef338d0dec06f976ab7de7e9b86878
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/sched/signal.h>
31 #include <linux/module.h>
32 #include <linux/init.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 <linux/vmalloc.h>
39 #include <linux/nospec.h>
40 #include "usbhid.h"
41
42 #ifdef CONFIG_USB_DYNAMIC_MINORS
43 #define HIDDEV_MINOR_BASE 0
44 #define HIDDEV_MINORS 256
45 #else
46 #define HIDDEV_MINOR_BASE 96
47 #define HIDDEV_MINORS 16
48 #endif
49 #define HIDDEV_BUFFER_SIZE 2048
50
51 struct hiddev_list {
52 struct hiddev_usage_ref buffer[HIDDEV_BUFFER_SIZE];
53 int head;
54 int tail;
55 unsigned flags;
56 struct fasync_struct *fasync;
57 struct hiddev *hiddev;
58 struct list_head node;
59 struct mutex thread_lock;
60 };
61
62 /*
63 * Find a report, given the report's type and ID. The ID can be specified
64 * indirectly by REPORT_ID_FIRST (which returns the first report of the given
65 * type) or by (REPORT_ID_NEXT | old_id), which returns the next report of the
66 * given type which follows old_id.
67 */
68 static struct hid_report *
69 hiddev_lookup_report(struct hid_device *hid, struct hiddev_report_info *rinfo)
70 {
71 unsigned int flags = rinfo->report_id & ~HID_REPORT_ID_MASK;
72 unsigned int rid = rinfo->report_id & HID_REPORT_ID_MASK;
73 struct hid_report_enum *report_enum;
74 struct hid_report *report;
75 struct list_head *list;
76
77 if (rinfo->report_type < HID_REPORT_TYPE_MIN ||
78 rinfo->report_type > HID_REPORT_TYPE_MAX)
79 return NULL;
80
81 report_enum = hid->report_enum +
82 (rinfo->report_type - HID_REPORT_TYPE_MIN);
83
84 switch (flags) {
85 case 0: /* Nothing to do -- report_id is already set correctly */
86 break;
87
88 case HID_REPORT_ID_FIRST:
89 if (list_empty(&report_enum->report_list))
90 return NULL;
91
92 list = report_enum->report_list.next;
93 report = list_entry(list, struct hid_report, list);
94 rinfo->report_id = report->id;
95 break;
96
97 case HID_REPORT_ID_NEXT:
98 report = report_enum->report_id_hash[rid];
99 if (!report)
100 return NULL;
101
102 list = report->list.next;
103 if (list == &report_enum->report_list)
104 return NULL;
105
106 report = list_entry(list, struct hid_report, list);
107 rinfo->report_id = report->id;
108 break;
109
110 default:
111 return NULL;
112 }
113
114 return report_enum->report_id_hash[rinfo->report_id];
115 }
116
117 /*
118 * Perform an exhaustive search of the report table for a usage, given its
119 * type and usage id.
120 */
121 static struct hid_field *
122 hiddev_lookup_usage(struct hid_device *hid, struct hiddev_usage_ref *uref)
123 {
124 int i, j;
125 struct hid_report *report;
126 struct hid_report_enum *report_enum;
127 struct hid_field *field;
128
129 if (uref->report_type < HID_REPORT_TYPE_MIN ||
130 uref->report_type > HID_REPORT_TYPE_MAX)
131 return NULL;
132
133 report_enum = hid->report_enum +
134 (uref->report_type - HID_REPORT_TYPE_MIN);
135
136 list_for_each_entry(report, &report_enum->report_list, list) {
137 for (i = 0; i < report->maxfield; i++) {
138 field = report->field[i];
139 for (j = 0; j < field->maxusage; j++) {
140 if (field->usage[j].hid == uref->usage_code) {
141 uref->report_id = report->id;
142 uref->field_index = i;
143 uref->usage_index = j;
144 return field;
145 }
146 }
147 }
148 }
149
150 return NULL;
151 }
152
153 static void hiddev_send_event(struct hid_device *hid,
154 struct hiddev_usage_ref *uref)
155 {
156 struct hiddev *hiddev = hid->hiddev;
157 struct hiddev_list *list;
158 unsigned long flags;
159
160 spin_lock_irqsave(&hiddev->list_lock, flags);
161 list_for_each_entry(list, &hiddev->list, node) {
162 if (uref->field_index != HID_FIELD_INDEX_NONE ||
163 (list->flags & HIDDEV_FLAG_REPORT) != 0) {
164 list->buffer[list->head] = *uref;
165 list->head = (list->head + 1) &
166 (HIDDEV_BUFFER_SIZE - 1);
167 kill_fasync(&list->fasync, SIGIO, POLL_IN);
168 }
169 }
170 spin_unlock_irqrestore(&hiddev->list_lock, flags);
171
172 wake_up_interruptible(&hiddev->wait);
173 }
174
175 /*
176 * This is where hid.c calls into hiddev to pass an event that occurred over
177 * the interrupt pipe
178 */
179 void hiddev_hid_event(struct hid_device *hid, struct hid_field *field,
180 struct hid_usage *usage, __s32 value)
181 {
182 unsigned type = field->report_type;
183 struct hiddev_usage_ref uref;
184
185 uref.report_type =
186 (type == HID_INPUT_REPORT) ? HID_REPORT_TYPE_INPUT :
187 ((type == HID_OUTPUT_REPORT) ? HID_REPORT_TYPE_OUTPUT :
188 ((type == HID_FEATURE_REPORT) ? HID_REPORT_TYPE_FEATURE : 0));
189 uref.report_id = field->report->id;
190 uref.field_index = field->index;
191 uref.usage_index = (usage - field->usage);
192 uref.usage_code = usage->hid;
193 uref.value = value;
194
195 hiddev_send_event(hid, &uref);
196 }
197 EXPORT_SYMBOL_GPL(hiddev_hid_event);
198
199 void hiddev_report_event(struct hid_device *hid, struct hid_report *report)
200 {
201 unsigned type = report->type;
202 struct hiddev_usage_ref uref;
203
204 memset(&uref, 0, sizeof(uref));
205 uref.report_type =
206 (type == HID_INPUT_REPORT) ? HID_REPORT_TYPE_INPUT :
207 ((type == HID_OUTPUT_REPORT) ? HID_REPORT_TYPE_OUTPUT :
208 ((type == HID_FEATURE_REPORT) ? HID_REPORT_TYPE_FEATURE : 0));
209 uref.report_id = report->id;
210 uref.field_index = HID_FIELD_INDEX_NONE;
211
212 hiddev_send_event(hid, &uref);
213 }
214
215 /*
216 * fasync file op
217 */
218 static int hiddev_fasync(int fd, struct file *file, int on)
219 {
220 struct hiddev_list *list = file->private_data;
221
222 return fasync_helper(fd, file, on, &list->fasync);
223 }
224
225
226 /*
227 * release file op
228 */
229 static int hiddev_release(struct inode * inode, struct file * file)
230 {
231 struct hiddev_list *list = file->private_data;
232 unsigned long flags;
233
234 spin_lock_irqsave(&list->hiddev->list_lock, flags);
235 list_del(&list->node);
236 spin_unlock_irqrestore(&list->hiddev->list_lock, flags);
237
238 mutex_lock(&list->hiddev->existancelock);
239 if (!--list->hiddev->open) {
240 if (list->hiddev->exist) {
241 hid_hw_close(list->hiddev->hid);
242 hid_hw_power(list->hiddev->hid, PM_HINT_NORMAL);
243 } else {
244 mutex_unlock(&list->hiddev->existancelock);
245 kfree(list->hiddev);
246 vfree(list);
247 return 0;
248 }
249 }
250
251 mutex_unlock(&list->hiddev->existancelock);
252 vfree(list);
253
254 return 0;
255 }
256
257 static int __hiddev_open(struct hiddev *hiddev, struct file *file)
258 {
259 struct hiddev_list *list;
260 int error;
261
262 lockdep_assert_held(&hiddev->existancelock);
263
264 list = vzalloc(sizeof(*list));
265 if (!list)
266 return -ENOMEM;
267
268 mutex_init(&list->thread_lock);
269 list->hiddev = hiddev;
270
271 if (!hiddev->open++) {
272 error = hid_hw_power(hiddev->hid, PM_HINT_FULLON);
273 if (error < 0)
274 goto err_drop_count;
275
276 error = hid_hw_open(hiddev->hid);
277 if (error < 0)
278 goto err_normal_power;
279 }
280
281 spin_lock_irq(&hiddev->list_lock);
282 list_add_tail(&list->node, &hiddev->list);
283 spin_unlock_irq(&hiddev->list_lock);
284
285 file->private_data = list;
286
287 return 0;
288
289 err_normal_power:
290 hid_hw_power(hiddev->hid, PM_HINT_NORMAL);
291 err_drop_count:
292 hiddev->open--;
293 vfree(list);
294 return error;
295 }
296
297 /*
298 * open file op
299 */
300 static int hiddev_open(struct inode *inode, struct file *file)
301 {
302 struct usb_interface *intf;
303 struct hid_device *hid;
304 struct hiddev *hiddev;
305 int res;
306
307 intf = usbhid_find_interface(iminor(inode));
308 if (!intf)
309 return -ENODEV;
310
311 hid = usb_get_intfdata(intf);
312 hiddev = hid->hiddev;
313
314 mutex_lock(&hiddev->existancelock);
315 res = hiddev->exist ? __hiddev_open(hiddev, file) : -ENODEV;
316 mutex_unlock(&hiddev->existancelock);
317
318 return res;
319 }
320
321 /*
322 * "write" file op
323 */
324 static ssize_t hiddev_write(struct file * file, const char __user * buffer, size_t count, loff_t *ppos)
325 {
326 return -EINVAL;
327 }
328
329 /*
330 * "read" file op
331 */
332 static ssize_t hiddev_read(struct file * file, char __user * buffer, size_t count, loff_t *ppos)
333 {
334 DEFINE_WAIT(wait);
335 struct hiddev_list *list = file->private_data;
336 int event_size;
337 int retval;
338
339 event_size = ((list->flags & HIDDEV_FLAG_UREF) != 0) ?
340 sizeof(struct hiddev_usage_ref) : sizeof(struct hiddev_event);
341
342 if (count < event_size)
343 return 0;
344
345 /* lock against other threads */
346 retval = mutex_lock_interruptible(&list->thread_lock);
347 if (retval)
348 return -ERESTARTSYS;
349
350 while (retval == 0) {
351 if (list->head == list->tail) {
352 prepare_to_wait(&list->hiddev->wait, &wait, TASK_INTERRUPTIBLE);
353
354 while (list->head == list->tail) {
355 if (signal_pending(current)) {
356 retval = -ERESTARTSYS;
357 break;
358 }
359 if (!list->hiddev->exist) {
360 retval = -EIO;
361 break;
362 }
363 if (file->f_flags & O_NONBLOCK) {
364 retval = -EAGAIN;
365 break;
366 }
367
368 /* let O_NONBLOCK tasks run */
369 mutex_unlock(&list->thread_lock);
370 schedule();
371 if (mutex_lock_interruptible(&list->thread_lock)) {
372 finish_wait(&list->hiddev->wait, &wait);
373 return -EINTR;
374 }
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 * "poll" file op
423 * No kernel lock - fine
424 */
425 static __poll_t 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 EPOLLIN | EPOLLRDNORM;
432 if (!list->hiddev->exist)
433 return EPOLLERR | EPOLLHUP;
434 return 0;
435 }
436
437 /*
438 * "ioctl" file op
439 */
440 static 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 uref = &uref_multi->uref;
454 if (cmd == HIDIOCGUSAGES || cmd == HIDIOCSUSAGES) {
455 if (copy_from_user(uref_multi, user_arg,
456 sizeof(*uref_multi)))
457 goto fault;
458 } else {
459 if (copy_from_user(uref, user_arg, sizeof(*uref)))
460 goto fault;
461 }
462
463 switch (cmd) {
464 case HIDIOCGUCODE:
465 rinfo.report_type = uref->report_type;
466 rinfo.report_id = uref->report_id;
467 if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL)
468 goto inval;
469
470 if (uref->field_index >= report->maxfield)
471 goto inval;
472 uref->field_index = array_index_nospec(uref->field_index,
473 report->maxfield);
474
475 field = report->field[uref->field_index];
476 if (uref->usage_index >= field->maxusage)
477 goto inval;
478 uref->usage_index = array_index_nospec(uref->usage_index,
479 field->maxusage);
480
481 uref->usage_code = field->usage[uref->usage_index].hid;
482
483 if (copy_to_user(user_arg, uref, sizeof(*uref)))
484 goto fault;
485
486 goto goodreturn;
487
488 default:
489 if (cmd != HIDIOCGUSAGE &&
490 cmd != HIDIOCGUSAGES &&
491 uref->report_type == HID_REPORT_TYPE_INPUT)
492 goto inval;
493
494 if (uref->report_id == HID_REPORT_ID_UNKNOWN) {
495 field = hiddev_lookup_usage(hid, uref);
496 if (field == NULL)
497 goto inval;
498 } else {
499 rinfo.report_type = uref->report_type;
500 rinfo.report_id = uref->report_id;
501 if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL)
502 goto inval;
503
504 if (uref->field_index >= report->maxfield)
505 goto inval;
506 uref->field_index = array_index_nospec(uref->field_index,
507 report->maxfield);
508
509 field = report->field[uref->field_index];
510
511 if (cmd == HIDIOCGCOLLECTIONINDEX) {
512 if (uref->usage_index >= field->maxusage)
513 goto inval;
514 uref->usage_index =
515 array_index_nospec(uref->usage_index,
516 field->maxusage);
517 } else if (uref->usage_index >= field->report_count)
518 goto inval;
519 }
520
521 if (cmd == HIDIOCGUSAGES || cmd == HIDIOCSUSAGES) {
522 if (uref_multi->num_values > HID_MAX_MULTI_USAGES ||
523 uref->usage_index + uref_multi->num_values >
524 field->report_count)
525 goto inval;
526
527 uref->usage_index =
528 array_index_nospec(uref->usage_index,
529 field->report_count -
530 uref_multi->num_values);
531 }
532
533 switch (cmd) {
534 case HIDIOCGUSAGE:
535 uref->value = field->value[uref->usage_index];
536 if (copy_to_user(user_arg, uref, sizeof(*uref)))
537 goto fault;
538 goto goodreturn;
539
540 case HIDIOCSUSAGE:
541 field->value[uref->usage_index] = uref->value;
542 goto goodreturn;
543
544 case HIDIOCGCOLLECTIONINDEX:
545 i = field->usage[uref->usage_index].collection_index;
546 kfree(uref_multi);
547 return i;
548 case HIDIOCGUSAGES:
549 for (i = 0; i < uref_multi->num_values; i++)
550 uref_multi->values[i] =
551 field->value[uref->usage_index + i];
552 if (copy_to_user(user_arg, uref_multi,
553 sizeof(*uref_multi)))
554 goto fault;
555 goto goodreturn;
556 case HIDIOCSUSAGES:
557 for (i = 0; i < uref_multi->num_values; i++)
558 field->value[uref->usage_index + i] =
559 uref_multi->values[i];
560 goto goodreturn;
561 }
562
563 goodreturn:
564 kfree(uref_multi);
565 return 0;
566 fault:
567 kfree(uref_multi);
568 return -EFAULT;
569 inval:
570 kfree(uref_multi);
571 return -EINVAL;
572 }
573 }
574
575 static noinline int hiddev_ioctl_string(struct hiddev *hiddev, unsigned int cmd, void __user *user_arg)
576 {
577 struct hid_device *hid = hiddev->hid;
578 struct usb_device *dev = hid_to_usb_dev(hid);
579 int idx, len;
580 char *buf;
581
582 if (get_user(idx, (int __user *)user_arg))
583 return -EFAULT;
584
585 if ((buf = kmalloc(HID_STRING_SIZE, GFP_KERNEL)) == NULL)
586 return -ENOMEM;
587
588 if ((len = usb_string(dev, idx, buf, HID_STRING_SIZE-1)) < 0) {
589 kfree(buf);
590 return -EINVAL;
591 }
592
593 if (copy_to_user(user_arg+sizeof(int), buf, len+1)) {
594 kfree(buf);
595 return -EFAULT;
596 }
597
598 kfree(buf);
599
600 return len;
601 }
602
603 static long hiddev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
604 {
605 struct hiddev_list *list = file->private_data;
606 struct hiddev *hiddev = list->hiddev;
607 struct hid_device *hid;
608 struct hiddev_collection_info cinfo;
609 struct hiddev_report_info rinfo;
610 struct hiddev_field_info finfo;
611 struct hiddev_devinfo dinfo;
612 struct hid_report *report;
613 struct hid_field *field;
614 void __user *user_arg = (void __user *)arg;
615 int i, r = -EINVAL;
616
617 /* Called without BKL by compat methods so no BKL taken */
618
619 mutex_lock(&hiddev->existancelock);
620 if (!hiddev->exist) {
621 r = -ENODEV;
622 goto ret_unlock;
623 }
624
625 hid = hiddev->hid;
626
627 switch (cmd) {
628
629 case HIDIOCGVERSION:
630 r = put_user(HID_VERSION, (int __user *)arg) ?
631 -EFAULT : 0;
632 break;
633
634 case HIDIOCAPPLICATION:
635 if (arg >= hid->maxapplication)
636 break;
637
638 for (i = 0; i < hid->maxcollection; i++)
639 if (hid->collection[i].type ==
640 HID_COLLECTION_APPLICATION && arg-- == 0)
641 break;
642
643 if (i < hid->maxcollection)
644 r = hid->collection[i].usage;
645 break;
646
647 case HIDIOCGDEVINFO:
648 {
649 struct usb_device *dev = hid_to_usb_dev(hid);
650 struct usbhid_device *usbhid = hid->driver_data;
651
652 memset(&dinfo, 0, sizeof(dinfo));
653
654 dinfo.bustype = BUS_USB;
655 dinfo.busnum = dev->bus->busnum;
656 dinfo.devnum = dev->devnum;
657 dinfo.ifnum = usbhid->ifnum;
658 dinfo.vendor = le16_to_cpu(dev->descriptor.idVendor);
659 dinfo.product = le16_to_cpu(dev->descriptor.idProduct);
660 dinfo.version = le16_to_cpu(dev->descriptor.bcdDevice);
661 dinfo.num_applications = hid->maxapplication;
662
663 r = copy_to_user(user_arg, &dinfo, sizeof(dinfo)) ?
664 -EFAULT : 0;
665 break;
666 }
667
668 case HIDIOCGFLAG:
669 r = put_user(list->flags, (int __user *)arg) ?
670 -EFAULT : 0;
671 break;
672
673 case HIDIOCSFLAG:
674 {
675 int newflags;
676
677 if (get_user(newflags, (int __user *)arg)) {
678 r = -EFAULT;
679 break;
680 }
681
682 if ((newflags & ~HIDDEV_FLAGS) != 0 ||
683 ((newflags & HIDDEV_FLAG_REPORT) != 0 &&
684 (newflags & HIDDEV_FLAG_UREF) == 0))
685 break;
686
687 list->flags = newflags;
688
689 r = 0;
690 break;
691 }
692
693 case HIDIOCGSTRING:
694 r = hiddev_ioctl_string(hiddev, cmd, user_arg);
695 break;
696
697 case HIDIOCINITREPORT:
698 usbhid_init_reports(hid);
699 hiddev->initialized = true;
700 r = 0;
701 break;
702
703 case HIDIOCGREPORT:
704 if (copy_from_user(&rinfo, user_arg, sizeof(rinfo))) {
705 r = -EFAULT;
706 break;
707 }
708
709 if (rinfo.report_type == HID_REPORT_TYPE_OUTPUT)
710 break;
711
712 report = hiddev_lookup_report(hid, &rinfo);
713 if (report == NULL)
714 break;
715
716 hid_hw_request(hid, report, HID_REQ_GET_REPORT);
717 hid_hw_wait(hid);
718
719 r = 0;
720 break;
721
722 case HIDIOCSREPORT:
723 if (copy_from_user(&rinfo, user_arg, sizeof(rinfo))) {
724 r = -EFAULT;
725 break;
726 }
727
728 if (rinfo.report_type == HID_REPORT_TYPE_INPUT)
729 break;
730
731 report = hiddev_lookup_report(hid, &rinfo);
732 if (report == NULL)
733 break;
734
735 hid_hw_request(hid, report, HID_REQ_SET_REPORT);
736 hid_hw_wait(hid);
737
738 r = 0;
739 break;
740
741 case HIDIOCGREPORTINFO:
742 if (copy_from_user(&rinfo, user_arg, sizeof(rinfo))) {
743 r = -EFAULT;
744 break;
745 }
746
747 report = hiddev_lookup_report(hid, &rinfo);
748 if (report == NULL)
749 break;
750
751 rinfo.num_fields = report->maxfield;
752
753 r = copy_to_user(user_arg, &rinfo, sizeof(rinfo)) ?
754 -EFAULT : 0;
755 break;
756
757 case HIDIOCGFIELDINFO:
758 if (copy_from_user(&finfo, user_arg, sizeof(finfo))) {
759 r = -EFAULT;
760 break;
761 }
762
763 rinfo.report_type = finfo.report_type;
764 rinfo.report_id = finfo.report_id;
765
766 report = hiddev_lookup_report(hid, &rinfo);
767 if (report == NULL)
768 break;
769
770 if (finfo.field_index >= report->maxfield)
771 break;
772 finfo.field_index = array_index_nospec(finfo.field_index,
773 report->maxfield);
774
775 field = report->field[finfo.field_index];
776 memset(&finfo, 0, sizeof(finfo));
777 finfo.report_type = rinfo.report_type;
778 finfo.report_id = rinfo.report_id;
779 finfo.field_index = field->report_count - 1;
780 finfo.maxusage = field->maxusage;
781 finfo.flags = field->flags;
782 finfo.physical = field->physical;
783 finfo.logical = field->logical;
784 finfo.application = field->application;
785 finfo.logical_minimum = field->logical_minimum;
786 finfo.logical_maximum = field->logical_maximum;
787 finfo.physical_minimum = field->physical_minimum;
788 finfo.physical_maximum = field->physical_maximum;
789 finfo.unit_exponent = field->unit_exponent;
790 finfo.unit = field->unit;
791
792 r = copy_to_user(user_arg, &finfo, sizeof(finfo)) ?
793 -EFAULT : 0;
794 break;
795
796 case HIDIOCGUCODE:
797 /* fall through */
798 case HIDIOCGUSAGE:
799 case HIDIOCSUSAGE:
800 case HIDIOCGUSAGES:
801 case HIDIOCSUSAGES:
802 case HIDIOCGCOLLECTIONINDEX:
803 if (!hiddev->initialized) {
804 usbhid_init_reports(hid);
805 hiddev->initialized = true;
806 }
807 r = hiddev_ioctl_usage(hiddev, cmd, user_arg);
808 break;
809
810 case HIDIOCGCOLLECTIONINFO:
811 if (copy_from_user(&cinfo, user_arg, sizeof(cinfo))) {
812 r = -EFAULT;
813 break;
814 }
815
816 if (cinfo.index >= hid->maxcollection)
817 break;
818 cinfo.index = array_index_nospec(cinfo.index,
819 hid->maxcollection);
820
821 cinfo.type = hid->collection[cinfo.index].type;
822 cinfo.usage = hid->collection[cinfo.index].usage;
823 cinfo.level = hid->collection[cinfo.index].level;
824
825 r = copy_to_user(user_arg, &cinfo, sizeof(cinfo)) ?
826 -EFAULT : 0;
827 break;
828
829 default:
830 if (_IOC_TYPE(cmd) != 'H' || _IOC_DIR(cmd) != _IOC_READ)
831 break;
832
833 if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGNAME(0))) {
834 int len = strlen(hid->name) + 1;
835 if (len > _IOC_SIZE(cmd))
836 len = _IOC_SIZE(cmd);
837 r = copy_to_user(user_arg, hid->name, len) ?
838 -EFAULT : len;
839 break;
840 }
841
842 if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGPHYS(0))) {
843 int len = strlen(hid->phys) + 1;
844 if (len > _IOC_SIZE(cmd))
845 len = _IOC_SIZE(cmd);
846 r = copy_to_user(user_arg, hid->phys, len) ?
847 -EFAULT : len;
848 break;
849 }
850 }
851
852 ret_unlock:
853 mutex_unlock(&hiddev->existancelock);
854 return r;
855 }
856
857 #ifdef CONFIG_COMPAT
858 static long hiddev_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
859 {
860 return hiddev_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
861 }
862 #endif
863
864 static const struct file_operations hiddev_fops = {
865 .owner = THIS_MODULE,
866 .read = hiddev_read,
867 .write = hiddev_write,
868 .poll = hiddev_poll,
869 .open = hiddev_open,
870 .release = hiddev_release,
871 .unlocked_ioctl = hiddev_ioctl,
872 .fasync = hiddev_fasync,
873 #ifdef CONFIG_COMPAT
874 .compat_ioctl = hiddev_compat_ioctl,
875 #endif
876 .llseek = noop_llseek,
877 };
878
879 static char *hiddev_devnode(struct device *dev, umode_t *mode)
880 {
881 return kasprintf(GFP_KERNEL, "usb/%s", dev_name(dev));
882 }
883
884 static struct usb_class_driver hiddev_class = {
885 .name = "hiddev%d",
886 .devnode = hiddev_devnode,
887 .fops = &hiddev_fops,
888 .minor_base = HIDDEV_MINOR_BASE,
889 };
890
891 /*
892 * This is where hid.c calls us to connect a hid device to the hiddev driver
893 */
894 int hiddev_connect(struct hid_device *hid, unsigned int force)
895 {
896 struct hiddev *hiddev;
897 struct usbhid_device *usbhid = hid->driver_data;
898 int retval;
899
900 if (!force) {
901 unsigned int i;
902 for (i = 0; i < hid->maxcollection; i++)
903 if (hid->collection[i].type ==
904 HID_COLLECTION_APPLICATION &&
905 !IS_INPUT_APPLICATION(hid->collection[i].usage))
906 break;
907
908 if (i == hid->maxcollection)
909 return -1;
910 }
911
912 if (!(hiddev = kzalloc(sizeof(struct hiddev), GFP_KERNEL)))
913 return -1;
914
915 init_waitqueue_head(&hiddev->wait);
916 INIT_LIST_HEAD(&hiddev->list);
917 spin_lock_init(&hiddev->list_lock);
918 mutex_init(&hiddev->existancelock);
919 hid->hiddev = hiddev;
920 hiddev->hid = hid;
921 hiddev->exist = 1;
922 retval = usb_register_dev(usbhid->intf, &hiddev_class);
923 if (retval) {
924 hid_err(hid, "Not able to get a minor for this device\n");
925 hid->hiddev = NULL;
926 kfree(hiddev);
927 return -1;
928 }
929
930 /*
931 * If HID_QUIRK_NO_INIT_REPORTS is set, make sure we don't initialize
932 * the reports.
933 */
934 hiddev->initialized = hid->quirks & HID_QUIRK_NO_INIT_REPORTS;
935
936 hiddev->minor = usbhid->intf->minor;
937
938 return 0;
939 }
940
941 /*
942 * This is where hid.c calls us to disconnect a hiddev device from the
943 * corresponding hid device (usually because the usb device has disconnected)
944 */
945 static struct usb_class_driver hiddev_class;
946 void hiddev_disconnect(struct hid_device *hid)
947 {
948 struct hiddev *hiddev = hid->hiddev;
949 struct usbhid_device *usbhid = hid->driver_data;
950
951 usb_deregister_dev(usbhid->intf, &hiddev_class);
952
953 mutex_lock(&hiddev->existancelock);
954 hiddev->exist = 0;
955
956 if (hiddev->open) {
957 hid_hw_close(hiddev->hid);
958 wake_up_interruptible(&hiddev->wait);
959 mutex_unlock(&hiddev->existancelock);
960 } else {
961 mutex_unlock(&hiddev->existancelock);
962 kfree(hiddev);
963 }
964 }
Linux with added FPC-III support