700145b1508894f30a018aef278d15cfc458ef3a
[muen/linux.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 <linux/vmalloc.h>
38 #include "usbhid.h"
39
40 #ifdef CONFIG_USB_DYNAMIC_MINORS
41 #define HIDDEV_MINOR_BASE       0
42 #define HIDDEV_MINORS           256
43 #else
44 #define HIDDEV_MINOR_BASE       96
45 #define HIDDEV_MINORS           16
46 #endif
47 #define HIDDEV_BUFFER_SIZE      2048
48
49 struct hiddev {
50         int exist;
51         int open;
52         struct mutex existancelock;
53         wait_queue_head_t wait;
54         struct hid_device *hid;
55         struct list_head list;
56         spinlock_t list_lock;
57 };
58
59 struct hiddev_list {
60         struct hiddev_usage_ref buffer[HIDDEV_BUFFER_SIZE];
61         int head;
62         int tail;
63         unsigned flags;
64         struct fasync_struct *fasync;
65         struct hiddev *hiddev;
66         struct list_head node;
67         struct mutex thread_lock;
68 };
69
70 /*
71  * Find a report, given the report's type and ID.  The ID can be specified
72  * indirectly by REPORT_ID_FIRST (which returns the first report of the given
73  * type) or by (REPORT_ID_NEXT | old_id), which returns the next report of the
74  * given type which follows old_id.
75  */
76 static struct hid_report *
77 hiddev_lookup_report(struct hid_device *hid, struct hiddev_report_info *rinfo)
78 {
79         unsigned int flags = rinfo->report_id & ~HID_REPORT_ID_MASK;
80         unsigned int rid = rinfo->report_id & HID_REPORT_ID_MASK;
81         struct hid_report_enum *report_enum;
82         struct hid_report *report;
83         struct list_head *list;
84
85         if (rinfo->report_type < HID_REPORT_TYPE_MIN ||
86             rinfo->report_type > HID_REPORT_TYPE_MAX)
87                 return NULL;
88
89         report_enum = hid->report_enum +
90                 (rinfo->report_type - HID_REPORT_TYPE_MIN);
91
92         switch (flags) {
93         case 0: /* Nothing to do -- report_id is already set correctly */
94                 break;
95
96         case HID_REPORT_ID_FIRST:
97                 if (list_empty(&report_enum->report_list))
98                         return NULL;
99
100                 list = report_enum->report_list.next;
101                 report = list_entry(list, struct hid_report, list);
102                 rinfo->report_id = report->id;
103                 break;
104
105         case HID_REPORT_ID_NEXT:
106                 report = report_enum->report_id_hash[rid];
107                 if (!report)
108                         return NULL;
109
110                 list = report->list.next;
111                 if (list == &report_enum->report_list)
112                         return NULL;
113
114                 report = list_entry(list, struct hid_report, list);
115                 rinfo->report_id = report->id;
116                 break;
117
118         default:
119                 return NULL;
120         }
121
122         return report_enum->report_id_hash[rinfo->report_id];
123 }
124
125 /*
126  * Perform an exhaustive search of the report table for a usage, given its
127  * type and usage id.
128  */
129 static struct hid_field *
130 hiddev_lookup_usage(struct hid_device *hid, struct hiddev_usage_ref *uref)
131 {
132         int i, j;
133         struct hid_report *report;
134         struct hid_report_enum *report_enum;
135         struct hid_field *field;
136
137         if (uref->report_type < HID_REPORT_TYPE_MIN ||
138             uref->report_type > HID_REPORT_TYPE_MAX)
139                 return NULL;
140
141         report_enum = hid->report_enum +
142                 (uref->report_type - HID_REPORT_TYPE_MIN);
143
144         list_for_each_entry(report, &report_enum->report_list, list) {
145                 for (i = 0; i < report->maxfield; i++) {
146                         field = report->field[i];
147                         for (j = 0; j < field->maxusage; j++) {
148                                 if (field->usage[j].hid == uref->usage_code) {
149                                         uref->report_id = report->id;
150                                         uref->field_index = i;
151                                         uref->usage_index = j;
152                                         return field;
153                                 }
154                         }
155                 }
156         }
157
158         return NULL;
159 }
160
161 static void hiddev_send_event(struct hid_device *hid,
162                               struct hiddev_usage_ref *uref)
163 {
164         struct hiddev *hiddev = hid->hiddev;
165         struct hiddev_list *list;
166         unsigned long flags;
167
168         spin_lock_irqsave(&hiddev->list_lock, flags);
169         list_for_each_entry(list, &hiddev->list, node) {
170                 if (uref->field_index != HID_FIELD_INDEX_NONE ||
171                     (list->flags & HIDDEV_FLAG_REPORT) != 0) {
172                         list->buffer[list->head] = *uref;
173                         list->head = (list->head + 1) &
174                                 (HIDDEV_BUFFER_SIZE - 1);
175                         kill_fasync(&list->fasync, SIGIO, POLL_IN);
176                 }
177         }
178         spin_unlock_irqrestore(&hiddev->list_lock, flags);
179
180         wake_up_interruptible(&hiddev->wait);
181 }
182
183 /*
184  * This is where hid.c calls into hiddev to pass an event that occurred over
185  * the interrupt pipe
186  */
187 void hiddev_hid_event(struct hid_device *hid, struct hid_field *field,
188                       struct hid_usage *usage, __s32 value)
189 {
190         unsigned type = field->report_type;
191         struct hiddev_usage_ref uref;
192
193         uref.report_type =
194           (type == HID_INPUT_REPORT) ? HID_REPORT_TYPE_INPUT :
195           ((type == HID_OUTPUT_REPORT) ? HID_REPORT_TYPE_OUTPUT :
196            ((type == HID_FEATURE_REPORT) ? HID_REPORT_TYPE_FEATURE : 0));
197         uref.report_id = field->report->id;
198         uref.field_index = field->index;
199         uref.usage_index = (usage - field->usage);
200         uref.usage_code = usage->hid;
201         uref.value = value;
202
203         hiddev_send_event(hid, &uref);
204 }
205 EXPORT_SYMBOL_GPL(hiddev_hid_event);
206
207 void hiddev_report_event(struct hid_device *hid, struct hid_report *report)
208 {
209         unsigned type = report->type;
210         struct hiddev_usage_ref uref;
211
212         memset(&uref, 0, sizeof(uref));
213         uref.report_type =
214           (type == HID_INPUT_REPORT) ? HID_REPORT_TYPE_INPUT :
215           ((type == HID_OUTPUT_REPORT) ? HID_REPORT_TYPE_OUTPUT :
216            ((type == HID_FEATURE_REPORT) ? HID_REPORT_TYPE_FEATURE : 0));
217         uref.report_id = report->id;
218         uref.field_index = HID_FIELD_INDEX_NONE;
219
220         hiddev_send_event(hid, &uref);
221 }
222
223 /*
224  * fasync file op
225  */
226 static int hiddev_fasync(int fd, struct file *file, int on)
227 {
228         struct hiddev_list *list = file->private_data;
229
230         return fasync_helper(fd, file, on, &list->fasync);
231 }
232
233
234 /*
235  * release file op
236  */
237 static int hiddev_release(struct inode * inode, struct file * file)
238 {
239         struct hiddev_list *list = file->private_data;
240         unsigned long flags;
241
242         spin_lock_irqsave(&list->hiddev->list_lock, flags);
243         list_del(&list->node);
244         spin_unlock_irqrestore(&list->hiddev->list_lock, flags);
245
246         mutex_lock(&list->hiddev->existancelock);
247         if (!--list->hiddev->open) {
248                 if (list->hiddev->exist) {
249                         usbhid_close(list->hiddev->hid);
250                         usbhid_put_power(list->hiddev->hid);
251                 } else {
252                         mutex_unlock(&list->hiddev->existancelock);
253                         kfree(list->hiddev);
254                         vfree(list);
255                         return 0;
256                 }
257         }
258
259         mutex_unlock(&list->hiddev->existancelock);
260         vfree(list);
261
262         return 0;
263 }
264
265 /*
266  * open file op
267  */
268 static int hiddev_open(struct inode *inode, struct file *file)
269 {
270         struct hiddev_list *list;
271         struct usb_interface *intf;
272         struct hid_device *hid;
273         struct hiddev *hiddev;
274         int res;
275
276         intf = usbhid_find_interface(iminor(inode));
277         if (!intf)
278                 return -ENODEV;
279         hid = usb_get_intfdata(intf);
280         hiddev = hid->hiddev;
281
282         if (!(list = vzalloc(sizeof(struct hiddev_list))))
283                 return -ENOMEM;
284         mutex_init(&list->thread_lock);
285         list->hiddev = hiddev;
286         file->private_data = list;
287
288         /*
289          * no need for locking because the USB major number
290          * is shared which usbcore guards against disconnect
291          */
292         if (list->hiddev->exist) {
293                 if (!list->hiddev->open++) {
294                         res = usbhid_open(hiddev->hid);
295                         if (res < 0) {
296                                 res = -EIO;
297                                 goto bail;
298                         }
299                 }
300         } else {
301                 res = -ENODEV;
302                 goto bail;
303         }
304
305         spin_lock_irq(&list->hiddev->list_lock);
306         list_add_tail(&list->node, &hiddev->list);
307         spin_unlock_irq(&list->hiddev->list_lock);
308
309         mutex_lock(&hiddev->existancelock);
310         if (!list->hiddev->open++)
311                 if (list->hiddev->exist) {
312                         struct hid_device *hid = hiddev->hid;
313                         res = usbhid_get_power(hid);
314                         if (res < 0) {
315                                 res = -EIO;
316                                 goto bail_unlock;
317                         }
318                         usbhid_open(hid);
319                 }
320         mutex_unlock(&hiddev->existancelock);
321         return 0;
322 bail_unlock:
323         mutex_unlock(&hiddev->existancelock);
324 bail:
325         file->private_data = NULL;
326         vfree(list);
327         return res;
328 }
329
330 /*
331  * "write" file op
332  */
333 static ssize_t hiddev_write(struct file * file, const char __user * buffer, size_t count, loff_t *ppos)
334 {
335         return -EINVAL;
336 }
337
338 /*
339  * "read" file op
340  */
341 static ssize_t hiddev_read(struct file * file, char __user * buffer, size_t count, loff_t *ppos)
342 {
343         DEFINE_WAIT(wait);
344         struct hiddev_list *list = file->private_data;
345         int event_size;
346         int retval;
347
348         event_size = ((list->flags & HIDDEV_FLAG_UREF) != 0) ?
349                 sizeof(struct hiddev_usage_ref) : sizeof(struct hiddev_event);
350
351         if (count < event_size)
352                 return 0;
353
354         /* lock against other threads */
355         retval = mutex_lock_interruptible(&list->thread_lock);
356         if (retval)
357                 return -ERESTARTSYS;
358
359         while (retval == 0) {
360                 if (list->head == list->tail) {
361                         prepare_to_wait(&list->hiddev->wait, &wait, TASK_INTERRUPTIBLE);
362
363                         while (list->head == list->tail) {
364                                 if (signal_pending(current)) {
365                                         retval = -ERESTARTSYS;
366                                         break;
367                                 }
368                                 if (!list->hiddev->exist) {
369                                         retval = -EIO;
370                                         break;
371                                 }
372                                 if (file->f_flags & O_NONBLOCK) {
373                                         retval = -EAGAIN;
374                                         break;
375                                 }
376
377                                 /* let O_NONBLOCK tasks run */
378                                 mutex_unlock(&list->thread_lock);
379                                 schedule();
380                                 if (mutex_lock_interruptible(&list->thread_lock)) {
381                                         finish_wait(&list->hiddev->wait, &wait);
382                                         return -EINTR;
383                                 }
384                                 set_current_state(TASK_INTERRUPTIBLE);
385                         }
386                         finish_wait(&list->hiddev->wait, &wait);
387
388                 }
389
390                 if (retval) {
391                         mutex_unlock(&list->thread_lock);
392                         return retval;
393                 }
394
395
396                 while (list->head != list->tail &&
397                        retval + event_size <= count) {
398                         if ((list->flags & HIDDEV_FLAG_UREF) == 0) {
399                                 if (list->buffer[list->tail].field_index != HID_FIELD_INDEX_NONE) {
400                                         struct hiddev_event event;
401
402                                         event.hid = list->buffer[list->tail].usage_code;
403                                         event.value = list->buffer[list->tail].value;
404                                         if (copy_to_user(buffer + retval, &event, sizeof(struct hiddev_event))) {
405                                                 mutex_unlock(&list->thread_lock);
406                                                 return -EFAULT;
407                                         }
408                                         retval += sizeof(struct hiddev_event);
409                                 }
410                         } else {
411                                 if (list->buffer[list->tail].field_index != HID_FIELD_INDEX_NONE ||
412                                     (list->flags & HIDDEV_FLAG_REPORT) != 0) {
413
414                                         if (copy_to_user(buffer + retval, list->buffer + list->tail, sizeof(struct hiddev_usage_ref))) {
415                                                 mutex_unlock(&list->thread_lock);
416                                                 return -EFAULT;
417                                         }
418                                         retval += sizeof(struct hiddev_usage_ref);
419                                 }
420                         }
421                         list->tail = (list->tail + 1) & (HIDDEV_BUFFER_SIZE - 1);
422                 }
423
424         }
425         mutex_unlock(&list->thread_lock);
426
427         return retval;
428 }
429
430 /*
431  * "poll" file op
432  * No kernel lock - fine
433  */
434 static unsigned int hiddev_poll(struct file *file, poll_table *wait)
435 {
436         struct hiddev_list *list = file->private_data;
437
438         poll_wait(file, &list->hiddev->wait, wait);
439         if (list->head != list->tail)
440                 return POLLIN | POLLRDNORM;
441         if (!list->hiddev->exist)
442                 return POLLERR | POLLHUP;
443         return 0;
444 }
445
446 /*
447  * "ioctl" file op
448  */
449 static noinline int hiddev_ioctl_usage(struct hiddev *hiddev, unsigned int cmd, void __user *user_arg)
450 {
451         struct hid_device *hid = hiddev->hid;
452         struct hiddev_report_info rinfo;
453         struct hiddev_usage_ref_multi *uref_multi = NULL;
454         struct hiddev_usage_ref *uref;
455         struct hid_report *report;
456         struct hid_field *field;
457         int i;
458
459         uref_multi = kmalloc(sizeof(struct hiddev_usage_ref_multi), GFP_KERNEL);
460         if (!uref_multi)
461                 return -ENOMEM;
462         uref = &uref_multi->uref;
463         if (cmd == HIDIOCGUSAGES || cmd == HIDIOCSUSAGES) {
464                 if (copy_from_user(uref_multi, user_arg,
465                                    sizeof(*uref_multi)))
466                         goto fault;
467         } else {
468                 if (copy_from_user(uref, user_arg, sizeof(*uref)))
469                         goto fault;
470         }
471
472         switch (cmd) {
473         case HIDIOCGUCODE:
474                 rinfo.report_type = uref->report_type;
475                 rinfo.report_id = uref->report_id;
476                 if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL)
477                         goto inval;
478
479                 if (uref->field_index >= report->maxfield)
480                         goto inval;
481
482                 field = report->field[uref->field_index];
483                 if (uref->usage_index >= field->maxusage)
484                         goto inval;
485
486                 uref->usage_code = field->usage[uref->usage_index].hid;
487
488                 if (copy_to_user(user_arg, uref, sizeof(*uref)))
489                         goto fault;
490
491                 goto goodreturn;
492
493         default:
494                 if (cmd != HIDIOCGUSAGE &&
495                     cmd != HIDIOCGUSAGES &&
496                     uref->report_type == HID_REPORT_TYPE_INPUT)
497                         goto inval;
498
499                 if (uref->report_id == HID_REPORT_ID_UNKNOWN) {
500                         field = hiddev_lookup_usage(hid, uref);
501                         if (field == NULL)
502                                 goto inval;
503                 } else {
504                         rinfo.report_type = uref->report_type;
505                         rinfo.report_id = uref->report_id;
506                         if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL)
507                                 goto inval;
508
509                         if (uref->field_index >= report->maxfield)
510                                 goto inval;
511
512                         field = report->field[uref->field_index];
513
514                         if (cmd == HIDIOCGCOLLECTIONINDEX) {
515                                 if (uref->usage_index >= field->maxusage)
516                                         goto inval;
517                         } else if (uref->usage_index >= field->report_count)
518                                 goto inval;
519                 }
520
521                 if ((cmd == HIDIOCGUSAGES || cmd == HIDIOCSUSAGES) &&
522                     (uref_multi->num_values > HID_MAX_MULTI_USAGES ||
523                      uref->usage_index + uref_multi->num_values > field->report_count))
524                         goto inval;
525
526                 switch (cmd) {
527                 case HIDIOCGUSAGE:
528                         uref->value = field->value[uref->usage_index];
529                         if (copy_to_user(user_arg, uref, sizeof(*uref)))
530                                 goto fault;
531                         goto goodreturn;
532
533                 case HIDIOCSUSAGE:
534                         field->value[uref->usage_index] = uref->value;
535                         goto goodreturn;
536
537                 case HIDIOCGCOLLECTIONINDEX:
538                         i = field->usage[uref->usage_index].collection_index;
539                         kfree(uref_multi);
540                         return i;
541                 case HIDIOCGUSAGES:
542                         for (i = 0; i < uref_multi->num_values; i++)
543                                 uref_multi->values[i] =
544                                     field->value[uref->usage_index + i];
545                         if (copy_to_user(user_arg, uref_multi,
546                                          sizeof(*uref_multi)))
547                                 goto fault;
548                         goto goodreturn;
549                 case HIDIOCSUSAGES:
550                         for (i = 0; i < uref_multi->num_values; i++)
551                                 field->value[uref->usage_index + i] =
552                                     uref_multi->values[i];
553                         goto goodreturn;
554                 }
555
556 goodreturn:
557                 kfree(uref_multi);
558                 return 0;
559 fault:
560                 kfree(uref_multi);
561                 return -EFAULT;
562 inval:
563                 kfree(uref_multi);
564                 return -EINVAL;
565         }
566 }
567
568 static noinline int hiddev_ioctl_string(struct hiddev *hiddev, unsigned int cmd, void __user *user_arg)
569 {
570         struct hid_device *hid = hiddev->hid;
571         struct usb_device *dev = hid_to_usb_dev(hid);
572         int idx, len;
573         char *buf;
574
575         if (get_user(idx, (int __user *)user_arg))
576                 return -EFAULT;
577
578         if ((buf = kmalloc(HID_STRING_SIZE, GFP_KERNEL)) == NULL)
579                 return -ENOMEM;
580
581         if ((len = usb_string(dev, idx, buf, HID_STRING_SIZE-1)) < 0) {
582                 kfree(buf);
583                 return -EINVAL;
584         }
585
586         if (copy_to_user(user_arg+sizeof(int), buf, len+1)) {
587                 kfree(buf);
588                 return -EFAULT;
589         }
590
591         kfree(buf);
592
593         return len;
594 }
595
596 static long hiddev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
597 {
598         struct hiddev_list *list = file->private_data;
599         struct hiddev *hiddev = list->hiddev;
600         struct hid_device *hid;
601         struct hiddev_collection_info cinfo;
602         struct hiddev_report_info rinfo;
603         struct hiddev_field_info finfo;
604         struct hiddev_devinfo dinfo;
605         struct hid_report *report;
606         struct hid_field *field;
607         void __user *user_arg = (void __user *)arg;
608         int i, r = -EINVAL;
609
610         /* Called without BKL by compat methods so no BKL taken */
611
612         mutex_lock(&hiddev->existancelock);
613         if (!hiddev->exist) {
614                 r = -ENODEV;
615                 goto ret_unlock;
616         }
617
618         hid = hiddev->hid;
619
620         switch (cmd) {
621
622         case HIDIOCGVERSION:
623                 r = put_user(HID_VERSION, (int __user *)arg) ?
624                         -EFAULT : 0;
625                 break;
626
627         case HIDIOCAPPLICATION:
628                 if (arg >= hid->maxapplication)
629                         break;
630
631                 for (i = 0; i < hid->maxcollection; i++)
632                         if (hid->collection[i].type ==
633                             HID_COLLECTION_APPLICATION && arg-- == 0)
634                                 break;
635
636                 if (i < hid->maxcollection)
637                         r = hid->collection[i].usage;
638                 break;
639
640         case HIDIOCGDEVINFO:
641                 {
642                         struct usb_device *dev = hid_to_usb_dev(hid);
643                         struct usbhid_device *usbhid = hid->driver_data;
644
645                         memset(&dinfo, 0, sizeof(dinfo));
646
647                         dinfo.bustype = BUS_USB;
648                         dinfo.busnum = dev->bus->busnum;
649                         dinfo.devnum = dev->devnum;
650                         dinfo.ifnum = usbhid->ifnum;
651                         dinfo.vendor = le16_to_cpu(dev->descriptor.idVendor);
652                         dinfo.product = le16_to_cpu(dev->descriptor.idProduct);
653                         dinfo.version = le16_to_cpu(dev->descriptor.bcdDevice);
654                         dinfo.num_applications = hid->maxapplication;
655
656                         r = copy_to_user(user_arg, &dinfo, sizeof(dinfo)) ?
657                                 -EFAULT : 0;
658                         break;
659                 }
660
661         case HIDIOCGFLAG:
662                 r = put_user(list->flags, (int __user *)arg) ?
663                         -EFAULT : 0;
664                 break;
665
666         case HIDIOCSFLAG:
667                 {
668                         int newflags;
669
670                         if (get_user(newflags, (int __user *)arg)) {
671                                 r = -EFAULT;
672                                 break;
673                         }
674
675                         if ((newflags & ~HIDDEV_FLAGS) != 0 ||
676                             ((newflags & HIDDEV_FLAG_REPORT) != 0 &&
677                              (newflags & HIDDEV_FLAG_UREF) == 0))
678                                 break;
679
680                         list->flags = newflags;
681
682                         r = 0;
683                         break;
684                 }
685
686         case HIDIOCGSTRING:
687                 r = hiddev_ioctl_string(hiddev, cmd, user_arg);
688                 break;
689
690         case HIDIOCINITREPORT:
691                 usbhid_init_reports(hid);
692                 r = 0;
693                 break;
694
695         case HIDIOCGREPORT:
696                 if (copy_from_user(&rinfo, user_arg, sizeof(rinfo))) {
697                         r = -EFAULT;
698                         break;
699                 }
700
701                 if (rinfo.report_type == HID_REPORT_TYPE_OUTPUT)
702                         break;
703
704                 report = hiddev_lookup_report(hid, &rinfo);
705                 if (report == NULL)
706                         break;
707
708                 hid_hw_request(hid, report, HID_REQ_GET_REPORT);
709                 hid_hw_wait(hid);
710
711                 r = 0;
712                 break;
713
714         case HIDIOCSREPORT:
715                 if (copy_from_user(&rinfo, user_arg, sizeof(rinfo))) {
716                         r = -EFAULT;
717                         break;
718                 }
719
720                 if (rinfo.report_type == HID_REPORT_TYPE_INPUT)
721                         break;
722
723                 report = hiddev_lookup_report(hid, &rinfo);
724                 if (report == NULL)
725                         break;
726
727                 hid_hw_request(hid, report, HID_REQ_SET_REPORT);
728                 hid_hw_wait(hid);
729
730                 r = 0;
731                 break;
732
733         case HIDIOCGREPORTINFO:
734                 if (copy_from_user(&rinfo, user_arg, sizeof(rinfo))) {
735                         r = -EFAULT;
736                         break;
737                 }
738
739                 report = hiddev_lookup_report(hid, &rinfo);
740                 if (report == NULL)
741                         break;
742
743                 rinfo.num_fields = report->maxfield;
744
745                 r = copy_to_user(user_arg, &rinfo, sizeof(rinfo)) ?
746                         -EFAULT : 0;
747                 break;
748
749         case HIDIOCGFIELDINFO:
750                 if (copy_from_user(&finfo, user_arg, sizeof(finfo))) {
751                         r = -EFAULT;
752                         break;
753                 }
754
755                 rinfo.report_type = finfo.report_type;
756                 rinfo.report_id = finfo.report_id;
757
758                 report = hiddev_lookup_report(hid, &rinfo);
759                 if (report == NULL)
760                         break;
761
762                 if (finfo.field_index >= report->maxfield)
763                         break;
764
765                 field = report->field[finfo.field_index];
766                 memset(&finfo, 0, sizeof(finfo));
767                 finfo.report_type = rinfo.report_type;
768                 finfo.report_id = rinfo.report_id;
769                 finfo.field_index = field->report_count - 1;
770                 finfo.maxusage = field->maxusage;
771                 finfo.flags = field->flags;
772                 finfo.physical = field->physical;
773                 finfo.logical = field->logical;
774                 finfo.application = field->application;
775                 finfo.logical_minimum = field->logical_minimum;
776                 finfo.logical_maximum = field->logical_maximum;
777                 finfo.physical_minimum = field->physical_minimum;
778                 finfo.physical_maximum = field->physical_maximum;
779                 finfo.unit_exponent = field->unit_exponent;
780                 finfo.unit = field->unit;
781
782                 r = copy_to_user(user_arg, &finfo, sizeof(finfo)) ?
783                         -EFAULT : 0;
784                 break;
785
786         case HIDIOCGUCODE:
787                 /* fall through */
788         case HIDIOCGUSAGE:
789         case HIDIOCSUSAGE:
790         case HIDIOCGUSAGES:
791         case HIDIOCSUSAGES:
792         case HIDIOCGCOLLECTIONINDEX:
793                 r = hiddev_ioctl_usage(hiddev, cmd, user_arg);
794                 break;
795
796         case HIDIOCGCOLLECTIONINFO:
797                 if (copy_from_user(&cinfo, user_arg, sizeof(cinfo))) {
798                         r = -EFAULT;
799                         break;
800                 }
801
802                 if (cinfo.index >= hid->maxcollection)
803                         break;
804
805                 cinfo.type = hid->collection[cinfo.index].type;
806                 cinfo.usage = hid->collection[cinfo.index].usage;
807                 cinfo.level = hid->collection[cinfo.index].level;
808
809                 r = copy_to_user(user_arg, &cinfo, sizeof(cinfo)) ?
810                         -EFAULT : 0;
811                 break;
812
813         default:
814                 if (_IOC_TYPE(cmd) != 'H' || _IOC_DIR(cmd) != _IOC_READ)
815                         break;
816
817                 if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGNAME(0))) {
818                         int len = strlen(hid->name) + 1;
819                         if (len > _IOC_SIZE(cmd))
820                                  len = _IOC_SIZE(cmd);
821                         r = copy_to_user(user_arg, hid->name, len) ?
822                                 -EFAULT : len;
823                         break;
824                 }
825
826                 if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGPHYS(0))) {
827                         int len = strlen(hid->phys) + 1;
828                         if (len > _IOC_SIZE(cmd))
829                                 len = _IOC_SIZE(cmd);
830                         r = copy_to_user(user_arg, hid->phys, len) ?
831                                 -EFAULT : len;
832                         break;
833                 }
834         }
835
836 ret_unlock:
837         mutex_unlock(&hiddev->existancelock);
838         return r;
839 }
840
841 #ifdef CONFIG_COMPAT
842 static long hiddev_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
843 {
844         return hiddev_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
845 }
846 #endif
847
848 static const struct file_operations hiddev_fops = {
849         .owner =        THIS_MODULE,
850         .read =         hiddev_read,
851         .write =        hiddev_write,
852         .poll =         hiddev_poll,
853         .open =         hiddev_open,
854         .release =      hiddev_release,
855         .unlocked_ioctl =       hiddev_ioctl,
856         .fasync =       hiddev_fasync,
857 #ifdef CONFIG_COMPAT
858         .compat_ioctl   = hiddev_compat_ioctl,
859 #endif
860         .llseek         = noop_llseek,
861 };
862
863 static char *hiddev_devnode(struct device *dev, umode_t *mode)
864 {
865         return kasprintf(GFP_KERNEL, "usb/%s", dev_name(dev));
866 }
867
868 static struct usb_class_driver hiddev_class = {
869         .name =         "hiddev%d",
870         .devnode =      hiddev_devnode,
871         .fops =         &hiddev_fops,
872         .minor_base =   HIDDEV_MINOR_BASE,
873 };
874
875 /*
876  * This is where hid.c calls us to connect a hid device to the hiddev driver
877  */
878 int hiddev_connect(struct hid_device *hid, unsigned int force)
879 {
880         struct hiddev *hiddev;
881         struct usbhid_device *usbhid = hid->driver_data;
882         int retval;
883
884         if (!force) {
885                 unsigned int i;
886                 for (i = 0; i < hid->maxcollection; i++)
887                         if (hid->collection[i].type ==
888                             HID_COLLECTION_APPLICATION &&
889                             !IS_INPUT_APPLICATION(hid->collection[i].usage))
890                                 break;
891
892                 if (i == hid->maxcollection)
893                         return -1;
894         }
895
896         if (!(hiddev = kzalloc(sizeof(struct hiddev), GFP_KERNEL)))
897                 return -1;
898
899         init_waitqueue_head(&hiddev->wait);
900         INIT_LIST_HEAD(&hiddev->list);
901         spin_lock_init(&hiddev->list_lock);
902         mutex_init(&hiddev->existancelock);
903         hid->hiddev = hiddev;
904         hiddev->hid = hid;
905         hiddev->exist = 1;
906         retval = usb_register_dev(usbhid->intf, &hiddev_class);
907         if (retval) {
908                 hid_err(hid, "Not able to get a minor for this device\n");
909                 hid->hiddev = NULL;
910                 kfree(hiddev);
911                 return -1;
912         }
913         return 0;
914 }
915
916 /*
917  * This is where hid.c calls us to disconnect a hiddev device from the
918  * corresponding hid device (usually because the usb device has disconnected)
919  */
920 static struct usb_class_driver hiddev_class;
921 void hiddev_disconnect(struct hid_device *hid)
922 {
923         struct hiddev *hiddev = hid->hiddev;
924         struct usbhid_device *usbhid = hid->driver_data;
925
926         usb_deregister_dev(usbhid->intf, &hiddev_class);
927
928         mutex_lock(&hiddev->existancelock);
929         hiddev->exist = 0;
930
931         if (hiddev->open) {
932                 mutex_unlock(&hiddev->existancelock);
933                 usbhid_close(hiddev->hid);
934                 wake_up_interruptible(&hiddev->wait);
935         } else {
936                 mutex_unlock(&hiddev->existancelock);
937                 kfree(hiddev);
938         }
939 }