Merge branches 'doc', 'multitouch', 'upstream' and 'upstream-fixes' into for-linus
[linux-2.6.git] / drivers / hid / usbhid / hiddev.c
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                         kfree(list->hiddev);
252                 }
253         }
254
255         kfree(list);
256         mutex_unlock(&list->hiddev->existancelock);
257
258         return 0;
259 }
260
261 /*
262  * open file op
263  */
264 static int hiddev_open(struct inode *inode, struct file *file)
265 {
266         struct hiddev_list *list;
267         struct usb_interface *intf;
268         struct hid_device *hid;
269         struct hiddev *hiddev;
270         int res;
271
272         intf = usbhid_find_interface(iminor(inode));
273         if (!intf)
274                 return -ENODEV;
275         hid = usb_get_intfdata(intf);
276         hiddev = hid->hiddev;
277
278         if (!(list = kzalloc(sizeof(struct hiddev_list), GFP_KERNEL)))
279                 return -ENOMEM;
280         mutex_init(&list->thread_lock);
281         list->hiddev = hiddev;
282         file->private_data = list;
283
284         /*
285          * no need for locking because the USB major number
286          * is shared which usbcore guards against disconnect
287          */
288         if (list->hiddev->exist) {
289                 if (!list->hiddev->open++) {
290                         res = usbhid_open(hiddev->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->list);
303         spin_unlock_irq(&list->hiddev->list_lock);
304
305         mutex_lock(&hiddev->existancelock);
306         if (!list->hiddev->open++)
307                 if (list->hiddev->exist) {
308                         struct hid_device *hid = hiddev->hid;
309                         res = usbhid_get_power(hid);
310                         if (res < 0) {
311                                 res = -EIO;
312                                 goto bail_unlock;
313                         }
314                         usbhid_open(hid);
315                 }
316         mutex_unlock(&hiddev->existancelock);
317         return 0;
318 bail_unlock:
319         mutex_unlock(&hiddev->existancelock);
320 bail:
321         file->private_data = NULL;
322         kfree(list);
323         return res;
324 }
325
326 /*
327  * "write" file op
328  */
329 static ssize_t hiddev_write(struct file * file, const char __user * buffer, size_t count, loff_t *ppos)
330 {
331         return -EINVAL;
332 }
333
334 /*
335  * "read" file op
336  */
337 static ssize_t hiddev_read(struct file * file, char __user * buffer, size_t count, loff_t *ppos)
338 {
339         DEFINE_WAIT(wait);
340         struct hiddev_list *list = file->private_data;
341         int event_size;
342         int retval;
343
344         event_size = ((list->flags & HIDDEV_FLAG_UREF) != 0) ?
345                 sizeof(struct hiddev_usage_ref) : sizeof(struct hiddev_event);
346
347         if (count < event_size)
348                 return 0;
349
350         /* lock against other threads */
351         retval = mutex_lock_interruptible(&list->thread_lock);
352         if (retval)
353                 return -ERESTARTSYS;
354
355         while (retval == 0) {
356                 if (list->head == list->tail) {
357                         prepare_to_wait(&list->hiddev->wait, &wait, TASK_INTERRUPTIBLE);
358
359                         while (list->head == list->tail) {
360                                 if (file->f_flags & O_NONBLOCK) {
361                                         retval = -EAGAIN;
362                                         break;
363                                 }
364                                 if (signal_pending(current)) {
365                                         retval = -ERESTARTSYS;
366                                         break;
367                                 }
368                                 if (!list->hiddev->exist) {
369                                         retval = -EIO;
370                                         break;
371                                 }
372
373                                 /* let O_NONBLOCK tasks run */
374                                 mutex_unlock(&list->thread_lock);
375                                 schedule();
376                                 if (mutex_lock_interruptible(&list->thread_lock)) {
377                                         finish_wait(&list->hiddev->wait, &wait);
378                                         return -EINTR;
379                                 }
380                                 set_current_state(TASK_INTERRUPTIBLE);
381                         }
382                         finish_wait(&list->hiddev->wait, &wait);
383
384                 }
385
386                 if (retval) {
387                         mutex_unlock(&list->thread_lock);
388                         return retval;
389                 }
390
391
392                 while (list->head != list->tail &&
393                        retval + event_size <= count) {
394                         if ((list->flags & HIDDEV_FLAG_UREF) == 0) {
395                                 if (list->buffer[list->tail].field_index != HID_FIELD_INDEX_NONE) {
396                                         struct hiddev_event event;
397
398                                         event.hid = list->buffer[list->tail].usage_code;
399                                         event.value = list->buffer[list->tail].value;
400                                         if (copy_to_user(buffer + retval, &event, sizeof(struct hiddev_event))) {
401                                                 mutex_unlock(&list->thread_lock);
402                                                 return -EFAULT;
403                                         }
404                                         retval += sizeof(struct hiddev_event);
405                                 }
406                         } else {
407                                 if (list->buffer[list->tail].field_index != HID_FIELD_INDEX_NONE ||
408                                     (list->flags & HIDDEV_FLAG_REPORT) != 0) {
409
410                                         if (copy_to_user(buffer + retval, list->buffer + list->tail, sizeof(struct hiddev_usage_ref))) {
411                                                 mutex_unlock(&list->thread_lock);
412                                                 return -EFAULT;
413                                         }
414                                         retval += sizeof(struct hiddev_usage_ref);
415                                 }
416                         }
417                         list->tail = (list->tail + 1) & (HIDDEV_BUFFER_SIZE - 1);
418                 }
419
420         }
421         mutex_unlock(&list->thread_lock);
422
423         return retval;
424 }
425
426 /*
427  * "poll" file op
428  * No kernel lock - fine
429  */
430 static unsigned int hiddev_poll(struct file *file, poll_table *wait)
431 {
432         struct hiddev_list *list = file->private_data;
433
434         poll_wait(file, &list->hiddev->wait, wait);
435         if (list->head != list->tail)
436                 return POLLIN | POLLRDNORM;
437         if (!list->hiddev->exist)
438                 return POLLERR | POLLHUP;
439         return 0;
440 }
441
442 /*
443  * "ioctl" file op
444  */
445 static noinline int hiddev_ioctl_usage(struct hiddev *hiddev, unsigned int cmd, void __user *user_arg)
446 {
447         struct hid_device *hid = hiddev->hid;
448         struct hiddev_report_info rinfo;
449         struct hiddev_usage_ref_multi *uref_multi = NULL;
450         struct hiddev_usage_ref *uref;
451         struct hid_report *report;
452         struct hid_field *field;
453         int i;
454
455         uref_multi = kmalloc(sizeof(struct hiddev_usage_ref_multi), GFP_KERNEL);
456         if (!uref_multi)
457                 return -ENOMEM;
458         uref = &uref_multi->uref;
459         if (cmd == HIDIOCGUSAGES || cmd == HIDIOCSUSAGES) {
460                 if (copy_from_user(uref_multi, user_arg,
461                                    sizeof(*uref_multi)))
462                         goto fault;
463         } else {
464                 if (copy_from_user(uref, user_arg, sizeof(*uref)))
465                         goto fault;
466         }
467
468         switch (cmd) {
469         case HIDIOCGUCODE:
470                 rinfo.report_type = uref->report_type;
471                 rinfo.report_id = uref->report_id;
472                 if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL)
473                         goto inval;
474
475                 if (uref->field_index >= report->maxfield)
476                         goto inval;
477
478                 field = report->field[uref->field_index];
479                 if (uref->usage_index >= field->maxusage)
480                         goto inval;
481
482                 uref->usage_code = field->usage[uref->usage_index].hid;
483
484                 if (copy_to_user(user_arg, uref, sizeof(*uref)))
485                         goto fault;
486
487                 goto goodreturn;
488
489         default:
490                 if (cmd != HIDIOCGUSAGE &&
491                     cmd != HIDIOCGUSAGES &&
492                     uref->report_type == HID_REPORT_TYPE_INPUT)
493                         goto inval;
494
495                 if (uref->report_id == HID_REPORT_ID_UNKNOWN) {
496                         field = hiddev_lookup_usage(hid, uref);
497                         if (field == NULL)
498                                 goto inval;
499                 } else {
500                         rinfo.report_type = uref->report_type;
501                         rinfo.report_id = uref->report_id;
502                         if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL)
503                                 goto inval;
504
505                         if (uref->field_index >= report->maxfield)
506                                 goto inval;
507
508                         field = report->field[uref->field_index];
509
510                         if (cmd == HIDIOCGCOLLECTIONINDEX) {
511                                 if (uref->usage_index >= field->maxusage)
512                                         goto inval;
513                         } else if (uref->usage_index >= field->report_count)
514                                 goto inval;
515
516                         else if ((cmd == HIDIOCGUSAGES || cmd == HIDIOCSUSAGES) &&
517                                  (uref_multi->num_values > HID_MAX_MULTI_USAGES ||
518                                   uref->usage_index + uref_multi->num_values > field->report_count))
519                                 goto inval;
520                 }
521
522                 switch (cmd) {
523                 case HIDIOCGUSAGE:
524                         uref->value = field->value[uref->usage_index];
525                         if (copy_to_user(user_arg, uref, sizeof(*uref)))
526                                 goto fault;
527                         goto goodreturn;
528
529                 case HIDIOCSUSAGE:
530                         field->value[uref->usage_index] = uref->value;
531                         goto goodreturn;
532
533                 case HIDIOCGCOLLECTIONINDEX:
534                         i = field->usage[uref->usage_index].collection_index;
535                         kfree(uref_multi);
536                         return i;
537                 case HIDIOCGUSAGES:
538                         for (i = 0; i < uref_multi->num_values; i++)
539                                 uref_multi->values[i] =
540                                     field->value[uref->usage_index + i];
541                         if (copy_to_user(user_arg, uref_multi,
542                                          sizeof(*uref_multi)))
543                                 goto fault;
544                         goto goodreturn;
545                 case HIDIOCSUSAGES:
546                         for (i = 0; i < uref_multi->num_values; i++)
547                                 field->value[uref->usage_index + i] =
548                                     uref_multi->values[i];
549                         goto goodreturn;
550                 }
551
552 goodreturn:
553                 kfree(uref_multi);
554                 return 0;
555 fault:
556                 kfree(uref_multi);
557                 return -EFAULT;
558 inval:
559                 kfree(uref_multi);
560                 return -EINVAL;
561         }
562 }
563
564 static 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
592 static 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;
597         struct hiddev_collection_info cinfo;
598         struct hiddev_report_info rinfo;
599         struct hiddev_field_info finfo;
600         struct hiddev_devinfo dinfo;
601         struct hid_report *report;
602         struct hid_field *field;
603         void __user *user_arg = (void __user *)arg;
604         int i, r = -EINVAL;
605
606         /* Called without BKL by compat methods so no BKL taken */
607
608         mutex_lock(&hiddev->existancelock);
609         if (!hiddev->exist) {
610                 r = -ENODEV;
611                 goto ret_unlock;
612         }
613
614         hid = hiddev->hid;
615
616         switch (cmd) {
617
618         case HIDIOCGVERSION:
619                 r = put_user(HID_VERSION, (int __user *)arg) ?
620                         -EFAULT : 0;
621                 break;
622
623         case HIDIOCAPPLICATION:
624                 if (arg < 0 || arg >= hid->maxapplication)
625                         break;
626
627                 for (i = 0; i < hid->maxcollection; i++)
628                         if (hid->collection[i].type ==
629                             HID_COLLECTION_APPLICATION && arg-- == 0)
630                                 break;
631
632                 if (i < hid->maxcollection)
633                         r = hid->collection[i].usage;
634                 break;
635
636         case HIDIOCGDEVINFO:
637                 {
638                         struct usb_device *dev = hid_to_usb_dev(hid);
639                         struct usbhid_device *usbhid = hid->driver_data;
640
641                         dinfo.bustype = BUS_USB;
642                         dinfo.busnum = dev->bus->busnum;
643                         dinfo.devnum = dev->devnum;
644                         dinfo.ifnum = usbhid->ifnum;
645                         dinfo.vendor = le16_to_cpu(dev->descriptor.idVendor);
646                         dinfo.product = le16_to_cpu(dev->descriptor.idProduct);
647                         dinfo.version = le16_to_cpu(dev->descriptor.bcdDevice);
648                         dinfo.num_applications = hid->maxapplication;
649
650                         r = copy_to_user(user_arg, &dinfo, sizeof(dinfo)) ?
651                                 -EFAULT : 0;
652                         break;
653                 }
654
655         case HIDIOCGFLAG:
656                 r = put_user(list->flags, (int __user *)arg) ?
657                         -EFAULT : 0;
658                 break;
659
660         case HIDIOCSFLAG:
661                 {
662                         int newflags;
663
664                         if (get_user(newflags, (int __user *)arg)) {
665                                 r = -EFAULT;
666                                 break;
667                         }
668
669                         if ((newflags & ~HIDDEV_FLAGS) != 0 ||
670                             ((newflags & HIDDEV_FLAG_REPORT) != 0 &&
671                              (newflags & HIDDEV_FLAG_UREF) == 0))
672                                 break;
673
674                         list->flags = newflags;
675
676                         r = 0;
677                         break;
678                 }
679
680         case HIDIOCGSTRING:
681                 r = hiddev_ioctl_string(hiddev, cmd, user_arg);
682                 break;
683
684         case HIDIOCINITREPORT:
685                 usbhid_init_reports(hid);
686                 r = 0;
687                 break;
688
689         case HIDIOCGREPORT:
690                 if (copy_from_user(&rinfo, user_arg, sizeof(rinfo))) {
691                         r = -EFAULT;
692                         break;
693                 }
694
695                 if (rinfo.report_type == HID_REPORT_TYPE_OUTPUT)
696                         break;
697
698                 report = hiddev_lookup_report(hid, &rinfo);
699                 if (report == NULL)
700                         break;
701
702                 usbhid_submit_report(hid, report, USB_DIR_IN);
703                 usbhid_wait_io(hid);
704
705                 r = 0;
706                 break;
707
708         case HIDIOCSREPORT:
709                 if (copy_from_user(&rinfo, user_arg, sizeof(rinfo))) {
710                         r = -EFAULT;
711                         break;
712                 }
713
714                 if (rinfo.report_type == HID_REPORT_TYPE_INPUT)
715                         break;
716
717                 report = hiddev_lookup_report(hid, &rinfo);
718                 if (report == NULL)
719                         break;
720
721                 usbhid_submit_report(hid, report, USB_DIR_OUT);
722                 usbhid_wait_io(hid);
723
724                 r = 0;
725                 break;
726
727         case HIDIOCGREPORTINFO:
728                 if (copy_from_user(&rinfo, user_arg, sizeof(rinfo))) {
729                         r = -EFAULT;
730                         break;
731                 }
732
733                 report = hiddev_lookup_report(hid, &rinfo);
734                 if (report == NULL)
735                         break;
736
737                 rinfo.num_fields = report->maxfield;
738
739                 r = copy_to_user(user_arg, &rinfo, sizeof(rinfo)) ?
740                         -EFAULT : 0;
741                 break;
742
743         case HIDIOCGFIELDINFO:
744                 if (copy_from_user(&finfo, user_arg, sizeof(finfo))) {
745                         r = -EFAULT;
746                         break;
747                 }
748
749                 rinfo.report_type = finfo.report_type;
750                 rinfo.report_id = finfo.report_id;
751
752                 report = hiddev_lookup_report(hid, &rinfo);
753                 if (report == NULL)
754                         break;
755
756                 if (finfo.field_index >= report->maxfield)
757                         break;
758
759                 field = report->field[finfo.field_index];
760                 memset(&finfo, 0, sizeof(finfo));
761                 finfo.report_type = rinfo.report_type;
762                 finfo.report_id = rinfo.report_id;
763                 finfo.field_index = field->report_count - 1;
764                 finfo.maxusage = field->maxusage;
765                 finfo.flags = field->flags;
766                 finfo.physical = field->physical;
767                 finfo.logical = field->logical;
768                 finfo.application = field->application;
769                 finfo.logical_minimum = field->logical_minimum;
770                 finfo.logical_maximum = field->logical_maximum;
771                 finfo.physical_minimum = field->physical_minimum;
772                 finfo.physical_maximum = field->physical_maximum;
773                 finfo.unit_exponent = field->unit_exponent;
774                 finfo.unit = field->unit;
775
776                 r = copy_to_user(user_arg, &finfo, sizeof(finfo)) ?
777                         -EFAULT : 0;
778                 break;
779
780         case HIDIOCGUCODE:
781                 /* fall through */
782         case HIDIOCGUSAGE:
783         case HIDIOCSUSAGE:
784         case HIDIOCGUSAGES:
785         case HIDIOCSUSAGES:
786         case HIDIOCGCOLLECTIONINDEX:
787                 r = hiddev_ioctl_usage(hiddev, cmd, user_arg);
788                 break;
789
790         case HIDIOCGCOLLECTIONINFO:
791                 if (copy_from_user(&cinfo, user_arg, sizeof(cinfo))) {
792                         r = -EFAULT;
793                         break;
794                 }
795
796                 if (cinfo.index >= hid->maxcollection)
797                         break;
798
799                 cinfo.type = hid->collection[cinfo.index].type;
800                 cinfo.usage = hid->collection[cinfo.index].usage;
801                 cinfo.level = hid->collection[cinfo.index].level;
802
803                 r = copy_to_user(user_arg, &cinfo, sizeof(cinfo)) ?
804                         -EFAULT : 0;
805                 break;
806
807         default:
808                 if (_IOC_TYPE(cmd) != 'H' || _IOC_DIR(cmd) != _IOC_READ)
809                         break;
810
811                 if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGNAME(0))) {
812                         int len = strlen(hid->name) + 1;
813                         if (len > _IOC_SIZE(cmd))
814                                  len = _IOC_SIZE(cmd);
815                         r = copy_to_user(user_arg, hid->name, len) ?
816                                 -EFAULT : len;
817                         break;
818                 }
819
820                 if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGPHYS(0))) {
821                         int len = strlen(hid->phys) + 1;
822                         if (len > _IOC_SIZE(cmd))
823                                 len = _IOC_SIZE(cmd);
824                         r = copy_to_user(user_arg, hid->phys, len) ?
825                                 -EFAULT : len;
826                         break;
827                 }
828         }
829
830 ret_unlock:
831         mutex_unlock(&hiddev->existancelock);
832         return r;
833 }
834
835 #ifdef CONFIG_COMPAT
836 static long hiddev_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
837 {
838         return hiddev_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
839 }
840 #endif
841
842 static const struct file_operations hiddev_fops = {
843         .owner =        THIS_MODULE,
844         .read =         hiddev_read,
845         .write =        hiddev_write,
846         .poll =         hiddev_poll,
847         .open =         hiddev_open,
848         .release =      hiddev_release,
849         .unlocked_ioctl =       hiddev_ioctl,
850         .fasync =       hiddev_fasync,
851 #ifdef CONFIG_COMPAT
852         .compat_ioctl   = hiddev_compat_ioctl,
853 #endif
854         .llseek         = noop_llseek,
855 };
856
857 static char *hiddev_devnode(struct device *dev, mode_t *mode)
858 {
859         return kasprintf(GFP_KERNEL, "usb/%s", dev_name(dev));
860 }
861
862 static struct usb_class_driver hiddev_class = {
863         .name =         "hiddev%d",
864         .devnode =      hiddev_devnode,
865         .fops =         &hiddev_fops,
866         .minor_base =   HIDDEV_MINOR_BASE,
867 };
868
869 /*
870  * This is where hid.c calls us to connect a hid device to the hiddev driver
871  */
872 int hiddev_connect(struct hid_device *hid, unsigned int force)
873 {
874         struct hiddev *hiddev;
875         struct usbhid_device *usbhid = hid->driver_data;
876         int retval;
877
878         if (!force) {
879                 unsigned int i;
880                 for (i = 0; i < hid->maxcollection; i++)
881                         if (hid->collection[i].type ==
882                             HID_COLLECTION_APPLICATION &&
883                             !IS_INPUT_APPLICATION(hid->collection[i].usage))
884                                 break;
885
886                 if (i == hid->maxcollection)
887                         return -1;
888         }
889
890         if (!(hiddev = kzalloc(sizeof(struct hiddev), GFP_KERNEL)))
891                 return -1;
892
893         init_waitqueue_head(&hiddev->wait);
894         INIT_LIST_HEAD(&hiddev->list);
895         spin_lock_init(&hiddev->list_lock);
896         mutex_init(&hiddev->existancelock);
897         hid->hiddev = hiddev;
898         hiddev->hid = hid;
899         hiddev->exist = 1;
900         retval = usb_register_dev(usbhid->intf, &hiddev_class);
901         if (retval) {
902                 hid_err(hid, "Not able to get a minor for this device\n");
903                 hid->hiddev = NULL;
904                 kfree(hiddev);
905                 return -1;
906         }
907         return 0;
908 }
909
910 /*
911  * This is where hid.c calls us to disconnect a hiddev device from the
912  * corresponding hid device (usually because the usb device has disconnected)
913  */
914 static struct usb_class_driver hiddev_class;
915 void hiddev_disconnect(struct hid_device *hid)
916 {
917         struct hiddev *hiddev = hid->hiddev;
918         struct usbhid_device *usbhid = hid->driver_data;
919
920         mutex_lock(&hiddev->existancelock);
921         hiddev->exist = 0;
922
923         usb_deregister_dev(usbhid->intf, &hiddev_class);
924
925         if (hiddev->open) {
926                 usbhid_close(hiddev->hid);
927                 wake_up_interruptible(&hiddev->wait);
928         } else {
929                 kfree(hiddev);
930         }
931         mutex_unlock(&hiddev->existancelock);
932 }