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x86/unwinder: Handle stack overflows more gracefully
[linux/fpc-iii.git] / drivers / hid / usbhid / hiddev.c
blob7d749b19c27c1bb5e4be36c39ac1bb0b39cc2cf6
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 "usbhid.h"
40
41 #ifdef CONFIG_USB_DYNAMIC_MINORS
42 #define HIDDEV_MINOR_BASE 0
43 #define HIDDEV_MINORS 256
44 #else
45 #define HIDDEV_MINOR_BASE 96
46 #define HIDDEV_MINORS 16
47 #endif
48 #define HIDDEV_BUFFER_SIZE 2048
49
50 struct hiddev_list {
51 struct hiddev_usage_ref buffer[HIDDEV_BUFFER_SIZE];
52 int head;
53 int tail;
54 unsigned flags;
55 struct fasync_struct *fasync;
56 struct hiddev *hiddev;
57 struct list_head node;
58 struct mutex thread_lock;
59 };
60
61 /*
62 * Find a report, given the report's type and ID. The ID can be specified
63 * indirectly by REPORT_ID_FIRST (which returns the first report of the given
64 * type) or by (REPORT_ID_NEXT | old_id), which returns the next report of the
65 * given type which follows old_id.
66 */
67 static struct hid_report *
68 hiddev_lookup_report(struct hid_device *hid, struct hiddev_report_info *rinfo)
69 {
70 unsigned int flags = rinfo->report_id & ~HID_REPORT_ID_MASK;
71 unsigned int rid = rinfo->report_id & HID_REPORT_ID_MASK;
72 struct hid_report_enum *report_enum;
73 struct hid_report *report;
74 struct list_head *list;
75
76 if (rinfo->report_type < HID_REPORT_TYPE_MIN ||
77 rinfo->report_type > HID_REPORT_TYPE_MAX)
78 return NULL;
79
80 report_enum = hid->report_enum +
81 (rinfo->report_type - HID_REPORT_TYPE_MIN);
82
83 switch (flags) {
84 case 0: /* Nothing to do -- report_id is already set correctly */
85 break;
86
87 case HID_REPORT_ID_FIRST:
88 if (list_empty(&report_enum->report_list))
89 return NULL;
90
91 list = report_enum->report_list.next;
92 report = list_entry(list, struct hid_report, list);
93 rinfo->report_id = report->id;
94 break;
95
96 case HID_REPORT_ID_NEXT:
97 report = report_enum->report_id_hash[rid];
98 if (!report)
99 return NULL;
100
101 list = report->list.next;
102 if (list == &report_enum->report_list)
103 return NULL;
104
105 report = list_entry(list, struct hid_report, list);
106 rinfo->report_id = report->id;
107 break;
108
109 default:
110 return NULL;
111 }
112
113 return report_enum->report_id_hash[rinfo->report_id];
114 }
115
116 /*
117 * Perform an exhaustive search of the report table for a usage, given its
118 * type and usage id.
119 */
120 static struct hid_field *
121 hiddev_lookup_usage(struct hid_device *hid, struct hiddev_usage_ref *uref)
122 {
123 int i, j;
124 struct hid_report *report;
125 struct hid_report_enum *report_enum;
126 struct hid_field *field;
127
128 if (uref->report_type < HID_REPORT_TYPE_MIN ||
129 uref->report_type > HID_REPORT_TYPE_MAX)
130 return NULL;
131
132 report_enum = hid->report_enum +
133 (uref->report_type - HID_REPORT_TYPE_MIN);
134
135 list_for_each_entry(report, &report_enum->report_list, list) {
136 for (i = 0; i < report->maxfield; i++) {
137 field = report->field[i];
138 for (j = 0; j < field->maxusage; j++) {
139 if (field->usage[j].hid == uref->usage_code) {
140 uref->report_id = report->id;
141 uref->field_index = i;
142 uref->usage_index = j;
143 return field;
144 }
145 }
146 }
147 }
148
149 return NULL;
150 }
151
152 static void hiddev_send_event(struct hid_device *hid,
153 struct hiddev_usage_ref *uref)
154 {
155 struct hiddev *hiddev = hid->hiddev;
156 struct hiddev_list *list;
157 unsigned long flags;
158
159 spin_lock_irqsave(&hiddev->list_lock, flags);
160 list_for_each_entry(list, &hiddev->list, node) {
161 if (uref->field_index != HID_FIELD_INDEX_NONE ||
162 (list->flags & HIDDEV_FLAG_REPORT) != 0) {
163 list->buffer[list->head] = *uref;
164 list->head = (list->head + 1) &
165 (HIDDEV_BUFFER_SIZE - 1);
166 kill_fasync(&list->fasync, SIGIO, POLL_IN);
167 }
168 }
169 spin_unlock_irqrestore(&hiddev->list_lock, flags);
170
171 wake_up_interruptible(&hiddev->wait);
172 }
173
174 /*
175 * This is where hid.c calls into hiddev to pass an event that occurred over
176 * the interrupt pipe
177 */
178 void hiddev_hid_event(struct hid_device *hid, struct hid_field *field,
179 struct hid_usage *usage, __s32 value)
180 {
181 unsigned type = field->report_type;
182 struct hiddev_usage_ref uref;
183
184 uref.report_type =
185 (type == HID_INPUT_REPORT) ? HID_REPORT_TYPE_INPUT :
186 ((type == HID_OUTPUT_REPORT) ? HID_REPORT_TYPE_OUTPUT :
187 ((type == HID_FEATURE_REPORT) ? HID_REPORT_TYPE_FEATURE : 0));
188 uref.report_id = field->report->id;
189 uref.field_index = field->index;
190 uref.usage_index = (usage - field->usage);
191 uref.usage_code = usage->hid;
192 uref.value = value;
193
194 hiddev_send_event(hid, &uref);
195 }
196 EXPORT_SYMBOL_GPL(hiddev_hid_event);
197
198 void hiddev_report_event(struct hid_device *hid, struct hid_report *report)
199 {
200 unsigned type = report->type;
201 struct hiddev_usage_ref uref;
202
203 memset(&uref, 0, sizeof(uref));
204 uref.report_type =
205 (type == HID_INPUT_REPORT) ? HID_REPORT_TYPE_INPUT :
206 ((type == HID_OUTPUT_REPORT) ? HID_REPORT_TYPE_OUTPUT :
207 ((type == HID_FEATURE_REPORT) ? HID_REPORT_TYPE_FEATURE : 0));
208 uref.report_id = report->id;
209 uref.field_index = HID_FIELD_INDEX_NONE;
210
211 hiddev_send_event(hid, &uref);
212 }
213
214 /*
215 * fasync file op
216 */
217 static int hiddev_fasync(int fd, struct file *file, int on)
218 {
219 struct hiddev_list *list = file->private_data;
220
221 return fasync_helper(fd, file, on, &list->fasync);
222 }
223
224
225 /*
226 * release file op
227 */
228 static int hiddev_release(struct inode * inode, struct file * file)
229 {
230 struct hiddev_list *list = file->private_data;
231 unsigned long flags;
232
233 spin_lock_irqsave(&list->hiddev->list_lock, flags);
234 list_del(&list->node);
235 spin_unlock_irqrestore(&list->hiddev->list_lock, flags);
236
237 mutex_lock(&list->hiddev->existancelock);
238 if (!--list->hiddev->open) {
239 if (list->hiddev->exist) {
240 hid_hw_close(list->hiddev->hid);
241 hid_hw_power(list->hiddev->hid, PM_HINT_NORMAL);
242 } else {
243 mutex_unlock(&list->hiddev->existancelock);
244 kfree(list->hiddev);
245 vfree(list);
246 return 0;
247 }
248 }
249
250 mutex_unlock(&list->hiddev->existancelock);
251 vfree(list);
252
253 return 0;
254 }
255
256 /*
257 * open file op
258 */
259 static int hiddev_open(struct inode *inode, struct file *file)
260 {
261 struct hiddev_list *list;
262 struct usb_interface *intf;
263 struct hid_device *hid;
264 struct hiddev *hiddev;
265 int res;
266
267 intf = usbhid_find_interface(iminor(inode));
268 if (!intf)
269 return -ENODEV;
270 hid = usb_get_intfdata(intf);
271 hiddev = hid->hiddev;
272
273 if (!(list = vzalloc(sizeof(struct hiddev_list))))
274 return -ENOMEM;
275 mutex_init(&list->thread_lock);
276 list->hiddev = hiddev;
277 file->private_data = list;
278
279 /*
280 * no need for locking because the USB major number
281 * is shared which usbcore guards against disconnect
282 */
283 if (list->hiddev->exist) {
284 if (!list->hiddev->open++) {
285 res = hid_hw_open(hiddev->hid);
286 if (res < 0)
287 goto bail;
288 }
289 } else {
290 res = -ENODEV;
291 goto bail;
292 }
293
294 spin_lock_irq(&list->hiddev->list_lock);
295 list_add_tail(&list->node, &hiddev->list);
296 spin_unlock_irq(&list->hiddev->list_lock);
297
298 mutex_lock(&hiddev->existancelock);
299 if (!list->hiddev->open++)
300 if (list->hiddev->exist) {
301 struct hid_device *hid = hiddev->hid;
302 res = hid_hw_power(hid, PM_HINT_FULLON);
303 if (res < 0)
304 goto bail_unlock;
305 res = hid_hw_open(hid);
306 if (res < 0)
307 goto bail_normal_power;
308 }
309 mutex_unlock(&hiddev->existancelock);
310 return 0;
311 bail_normal_power:
312 hid_hw_power(hid, PM_HINT_NORMAL);
313 bail_unlock:
314 mutex_unlock(&hiddev->existancelock);
315 bail:
316 file->private_data = NULL;
317 vfree(list);
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 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 * "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
473 field = report->field[uref->field_index];
474 if (uref->usage_index >= field->maxusage)
475 goto inval;
476
477 uref->usage_code = field->usage[uref->usage_index].hid;
478
479 if (copy_to_user(user_arg, uref, sizeof(*uref)))
480 goto fault;
481
482 goto goodreturn;
483
484 default:
485 if (cmd != HIDIOCGUSAGE &&
486 cmd != HIDIOCGUSAGES &&
487 uref->report_type == HID_REPORT_TYPE_INPUT)
488 goto inval;
489
490 if (uref->report_id == HID_REPORT_ID_UNKNOWN) {
491 field = hiddev_lookup_usage(hid, uref);
492 if (field == NULL)
493 goto inval;
494 } else {
495 rinfo.report_type = uref->report_type;
496 rinfo.report_id = uref->report_id;
497 if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL)
498 goto inval;
499
500 if (uref->field_index >= report->maxfield)
501 goto inval;
502
503 field = report->field[uref->field_index];
504
505 if (cmd == HIDIOCGCOLLECTIONINDEX) {
506 if (uref->usage_index >= field->maxusage)
507 goto inval;
508 } else if (uref->usage_index >= field->report_count)
509 goto inval;
510 }
511
512 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 switch (cmd) {
518 case HIDIOCGUSAGE:
519 uref->value = field->value[uref->usage_index];
520 if (copy_to_user(user_arg, uref, sizeof(*uref)))
521 goto fault;
522 goto goodreturn;
523
524 case HIDIOCSUSAGE:
525 field->value[uref->usage_index] = uref->value;
526 goto goodreturn;
527
528 case HIDIOCGCOLLECTIONINDEX:
529 i = field->usage[uref->usage_index].collection_index;
530 kfree(uref_multi);
531 return i;
532 case HIDIOCGUSAGES:
533 for (i = 0; i < uref_multi->num_values; i++)
534 uref_multi->values[i] =
535 field->value[uref->usage_index + i];
536 if (copy_to_user(user_arg, uref_multi,
537 sizeof(*uref_multi)))
538 goto fault;
539 goto goodreturn;
540 case HIDIOCSUSAGES:
541 for (i = 0; i < uref_multi->num_values; i++)
542 field->value[uref->usage_index + i] =
543 uref_multi->values[i];
544 goto goodreturn;
545 }
546
547 goodreturn:
548 kfree(uref_multi);
549 return 0;
550 fault:
551 kfree(uref_multi);
552 return -EFAULT;
553 inval:
554 kfree(uref_multi);
555 return -EINVAL;
556 }
557 }
558
559 static noinline int hiddev_ioctl_string(struct hiddev *hiddev, unsigned int cmd, void __user *user_arg)
560 {
561 struct hid_device *hid = hiddev->hid;
562 struct usb_device *dev = hid_to_usb_dev(hid);
563 int idx, len;
564 char *buf;
565
566 if (get_user(idx, (int __user *)user_arg))
567 return -EFAULT;
568
569 if ((buf = kmalloc(HID_STRING_SIZE, GFP_KERNEL)) == NULL)
570 return -ENOMEM;
571
572 if ((len = usb_string(dev, idx, buf, HID_STRING_SIZE-1)) < 0) {
573 kfree(buf);
574 return -EINVAL;
575 }
576
577 if (copy_to_user(user_arg+sizeof(int), buf, len+1)) {
578 kfree(buf);
579 return -EFAULT;
580 }
581
582 kfree(buf);
583
584 return len;
585 }
586
587 static long hiddev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
588 {
589 struct hiddev_list *list = file->private_data;
590 struct hiddev *hiddev = list->hiddev;
591 struct hid_device *hid;
592 struct hiddev_collection_info cinfo;
593 struct hiddev_report_info rinfo;
594 struct hiddev_field_info finfo;
595 struct hiddev_devinfo dinfo;
596 struct hid_report *report;
597 struct hid_field *field;
598 void __user *user_arg = (void __user *)arg;
599 int i, r = -EINVAL;
600
601 /* Called without BKL by compat methods so no BKL taken */
602
603 mutex_lock(&hiddev->existancelock);
604 if (!hiddev->exist) {
605 r = -ENODEV;
606 goto ret_unlock;
607 }
608
609 hid = hiddev->hid;
610
611 switch (cmd) {
612
613 case HIDIOCGVERSION:
614 r = put_user(HID_VERSION, (int __user *)arg) ?
615 -EFAULT : 0;
616 break;
617
618 case HIDIOCAPPLICATION:
619 if (arg >= hid->maxapplication)
620 break;
621
622 for (i = 0; i < hid->maxcollection; i++)
623 if (hid->collection[i].type ==
624 HID_COLLECTION_APPLICATION && arg-- == 0)
625 break;
626
627 if (i < hid->maxcollection)
628 r = hid->collection[i].usage;
629 break;
630
631 case HIDIOCGDEVINFO:
632 {
633 struct usb_device *dev = hid_to_usb_dev(hid);
634 struct usbhid_device *usbhid = hid->driver_data;
635
636 memset(&dinfo, 0, sizeof(dinfo));
637
638 dinfo.bustype = BUS_USB;
639 dinfo.busnum = dev->bus->busnum;
640 dinfo.devnum = dev->devnum;
641 dinfo.ifnum = usbhid->ifnum;
642 dinfo.vendor = le16_to_cpu(dev->descriptor.idVendor);
643 dinfo.product = le16_to_cpu(dev->descriptor.idProduct);
644 dinfo.version = le16_to_cpu(dev->descriptor.bcdDevice);
645 dinfo.num_applications = hid->maxapplication;
646
647 r = copy_to_user(user_arg, &dinfo, sizeof(dinfo)) ?
648 -EFAULT : 0;
649 break;
650 }
651
652 case HIDIOCGFLAG:
653 r = put_user(list->flags, (int __user *)arg) ?
654 -EFAULT : 0;
655 break;
656
657 case HIDIOCSFLAG:
658 {
659 int newflags;
660
661 if (get_user(newflags, (int __user *)arg)) {
662 r = -EFAULT;
663 break;
664 }
665
666 if ((newflags & ~HIDDEV_FLAGS) != 0 ||
667 ((newflags & HIDDEV_FLAG_REPORT) != 0 &&
668 (newflags & HIDDEV_FLAG_UREF) == 0))
669 break;
670
671 list->flags = newflags;
672
673 r = 0;
674 break;
675 }
676
677 case HIDIOCGSTRING:
678 r = hiddev_ioctl_string(hiddev, cmd, user_arg);
679 break;
680
681 case HIDIOCINITREPORT:
682 usbhid_init_reports(hid);
683 hiddev->initialized = true;
684 r = 0;
685 break;
686
687 case HIDIOCGREPORT:
688 if (copy_from_user(&rinfo, user_arg, sizeof(rinfo))) {
689 r = -EFAULT;
690 break;
691 }
692
693 if (rinfo.report_type == HID_REPORT_TYPE_OUTPUT)
694 break;
695
696 report = hiddev_lookup_report(hid, &rinfo);
697 if (report == NULL)
698 break;
699
700 hid_hw_request(hid, report, HID_REQ_GET_REPORT);
701 hid_hw_wait(hid);
702
703 r = 0;
704 break;
705
706 case HIDIOCSREPORT:
707 if (copy_from_user(&rinfo, user_arg, sizeof(rinfo))) {
708 r = -EFAULT;
709 break;
710 }
711
712 if (rinfo.report_type == HID_REPORT_TYPE_INPUT)
713 break;
714
715 report = hiddev_lookup_report(hid, &rinfo);
716 if (report == NULL)
717 break;
718
719 hid_hw_request(hid, report, HID_REQ_SET_REPORT);
720 hid_hw_wait(hid);
721
722 r = 0;
723 break;
724
725 case HIDIOCGREPORTINFO:
726 if (copy_from_user(&rinfo, user_arg, sizeof(rinfo))) {
727 r = -EFAULT;
728 break;
729 }
730
731 report = hiddev_lookup_report(hid, &rinfo);
732 if (report == NULL)
733 break;
734
735 rinfo.num_fields = report->maxfield;
736
737 r = copy_to_user(user_arg, &rinfo, sizeof(rinfo)) ?
738 -EFAULT : 0;
739 break;
740
741 case HIDIOCGFIELDINFO:
742 if (copy_from_user(&finfo, user_arg, sizeof(finfo))) {
743 r = -EFAULT;
744 break;
745 }
746
747 rinfo.report_type = finfo.report_type;
748 rinfo.report_id = finfo.report_id;
749
750 report = hiddev_lookup_report(hid, &rinfo);
751 if (report == NULL)
752 break;
753
754 if (finfo.field_index >= report->maxfield)
755 break;
756
757 field = report->field[finfo.field_index];
758 memset(&finfo, 0, sizeof(finfo));
759 finfo.report_type = rinfo.report_type;
760 finfo.report_id = rinfo.report_id;
761 finfo.field_index = field->report_count - 1;
762 finfo.maxusage = field->maxusage;
763 finfo.flags = field->flags;
764 finfo.physical = field->physical;
765 finfo.logical = field->logical;
766 finfo.application = field->application;
767 finfo.logical_minimum = field->logical_minimum;
768 finfo.logical_maximum = field->logical_maximum;
769 finfo.physical_minimum = field->physical_minimum;
770 finfo.physical_maximum = field->physical_maximum;
771 finfo.unit_exponent = field->unit_exponent;
772 finfo.unit = field->unit;
773
774 r = copy_to_user(user_arg, &finfo, sizeof(finfo)) ?
775 -EFAULT : 0;
776 break;
777
778 case HIDIOCGUCODE:
779 /* fall through */
780 case HIDIOCGUSAGE:
781 case HIDIOCSUSAGE:
782 case HIDIOCGUSAGES:
783 case HIDIOCSUSAGES:
784 case HIDIOCGCOLLECTIONINDEX:
785 if (!hiddev->initialized) {
786 usbhid_init_reports(hid);
787 hiddev->initialized = true;
788 }
789 r = hiddev_ioctl_usage(hiddev, cmd, user_arg);
790 break;
791
792 case HIDIOCGCOLLECTIONINFO:
793 if (copy_from_user(&cinfo, user_arg, sizeof(cinfo))) {
794 r = -EFAULT;
795 break;
796 }
797
798 if (cinfo.index >= hid->maxcollection)
799 break;
800
801 cinfo.type = hid->collection[cinfo.index].type;
802 cinfo.usage = hid->collection[cinfo.index].usage;
803 cinfo.level = hid->collection[cinfo.index].level;
804
805 r = copy_to_user(user_arg, &cinfo, sizeof(cinfo)) ?
806 -EFAULT : 0;
807 break;
808
809 default:
810 if (_IOC_TYPE(cmd) != 'H' || _IOC_DIR(cmd) != _IOC_READ)
811 break;
812
813 if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGNAME(0))) {
814 int len = strlen(hid->name) + 1;
815 if (len > _IOC_SIZE(cmd))
816 len = _IOC_SIZE(cmd);
817 r = copy_to_user(user_arg, hid->name, len) ?
818 -EFAULT : len;
819 break;
820 }
821
822 if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGPHYS(0))) {
823 int len = strlen(hid->phys) + 1;
824 if (len > _IOC_SIZE(cmd))
825 len = _IOC_SIZE(cmd);
826 r = copy_to_user(user_arg, hid->phys, len) ?
827 -EFAULT : len;
828 break;
829 }
830 }
831
832 ret_unlock:
833 mutex_unlock(&hiddev->existancelock);
834 return r;
835 }
836
837 #ifdef CONFIG_COMPAT
838 static long hiddev_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
839 {
840 return hiddev_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
841 }
842 #endif
843
844 static const struct file_operations hiddev_fops = {
845 .owner = THIS_MODULE,
846 .read = hiddev_read,
847 .write = hiddev_write,
848 .poll = hiddev_poll,
849 .open = hiddev_open,
850 .release = hiddev_release,
851 .unlocked_ioctl = hiddev_ioctl,
852 .fasync = hiddev_fasync,
853 #ifdef CONFIG_COMPAT
854 .compat_ioctl = hiddev_compat_ioctl,
855 #endif
856 .llseek = noop_llseek,
857 };
858
859 static char *hiddev_devnode(struct device *dev, umode_t *mode)
860 {
861 return kasprintf(GFP_KERNEL, "usb/%s", dev_name(dev));
862 }
863
864 static struct usb_class_driver hiddev_class = {
865 .name = "hiddev%d",
866 .devnode = hiddev_devnode,
867 .fops = &hiddev_fops,
868 .minor_base = HIDDEV_MINOR_BASE,
869 };
870
871 /*
872 * This is where hid.c calls us to connect a hid device to the hiddev driver
873 */
874 int hiddev_connect(struct hid_device *hid, unsigned int force)
875 {
876 struct hiddev *hiddev;
877 struct usbhid_device *usbhid = hid->driver_data;
878 int retval;
879
880 if (!force) {
881 unsigned int i;
882 for (i = 0; i < hid->maxcollection; i++)
883 if (hid->collection[i].type ==
884 HID_COLLECTION_APPLICATION &&
885 !IS_INPUT_APPLICATION(hid->collection[i].usage))
886 break;
887
888 if (i == hid->maxcollection)
889 return -1;
890 }
891
892 if (!(hiddev = kzalloc(sizeof(struct hiddev), GFP_KERNEL)))
893 return -1;
894
895 init_waitqueue_head(&hiddev->wait);
896 INIT_LIST_HEAD(&hiddev->list);
897 spin_lock_init(&hiddev->list_lock);
898 mutex_init(&hiddev->existancelock);
899 hid->hiddev = hiddev;
900 hiddev->hid = hid;
901 hiddev->exist = 1;
902 retval = usb_register_dev(usbhid->intf, &hiddev_class);
903 if (retval) {
904 hid_err(hid, "Not able to get a minor for this device\n");
905 hid->hiddev = NULL;
906 kfree(hiddev);
907 return -1;
908 }
909
910 /*
911 * If HID_QUIRK_NO_INIT_REPORTS is set, make sure we don't initialize
912 * the reports.
913 */
914 hiddev->initialized = hid->quirks & HID_QUIRK_NO_INIT_REPORTS;
915
916 hiddev->minor = usbhid->intf->minor;
917
918 return 0;
919 }
920
921 /*
922 * This is where hid.c calls us to disconnect a hiddev device from the
923 * corresponding hid device (usually because the usb device has disconnected)
924 */
925 static struct usb_class_driver hiddev_class;
926 void hiddev_disconnect(struct hid_device *hid)
927 {
928 struct hiddev *hiddev = hid->hiddev;
929 struct usbhid_device *usbhid = hid->driver_data;
930
931 usb_deregister_dev(usbhid->intf, &hiddev_class);
932
933 mutex_lock(&hiddev->existancelock);
934 hiddev->exist = 0;
935
936 if (hiddev->open) {
937 mutex_unlock(&hiddev->existancelock);
938 hid_hw_close(hiddev->hid);
939 wake_up_interruptible(&hiddev->wait);
940 } else {
941 mutex_unlock(&hiddev->existancelock);
942 kfree(hiddev);
943 }
944 }
Linux with added FPC-III support