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28#define HIDDEV_MINOR_BASE 96
29#define HIDDEV_MINORS 16
30#define HIDDEV_BUFFER_SIZE 64
31
32#include <linux/poll.h>
33#include <linux/slab.h>
34#include <linux/module.h>
35#include <linux/init.h>
36#include <linux/smp_lock.h>
37#include <linux/input.h>
38#include <linux/usb.h>
39#include "hid.h"
40#include <linux/hiddev.h>
41
42struct hiddev {
43 int exist;
44 int open;
45 int minor;
46 wait_queue_head_t wait;
47 devfs_handle_t devfs;
48 struct hid_device *hid;
49 struct hiddev_list *list;
50};
51
52struct hiddev_list {
53 struct hiddev_usage_ref buffer[HIDDEV_BUFFER_SIZE];
54 int head;
55 int tail;
56 unsigned flags;
57 struct fasync_struct *fasync;
58 struct hiddev *hiddev;
59 struct hiddev_list *next;
60};
61
62static struct hiddev *hiddev_table[HIDDEV_MINORS];
63static devfs_handle_t hiddev_devfs_handle;
64
65
66
67
68
69
70
71static struct hid_report *
72hiddev_lookup_report(struct hid_device *hid, struct hiddev_report_info *rinfo)
73{
74 unsigned flags = rinfo->report_id & ~HID_REPORT_ID_MASK;
75 struct hid_report_enum *report_enum = NULL;
76 struct list_head *list;
77
78 if (rinfo->report_type < HID_REPORT_TYPE_MIN ||
79 rinfo->report_type > HID_REPORT_TYPE_MAX) return NULL;
80
81 report_enum = hid->report_enum +
82 (rinfo->report_type - HID_REPORT_TYPE_MIN);
83
84 switch (flags) {
85 case 0:
86 break;
87
88 case HID_REPORT_ID_FIRST:
89 list = report_enum->report_list.next;
90 if (list == &report_enum->report_list) return NULL;
91 rinfo->report_id = ((struct hid_report *) list)->id;
92 break;
93
94 case HID_REPORT_ID_NEXT:
95 list = (struct list_head *)
96 report_enum->report_id_hash[rinfo->report_id &
97 HID_REPORT_ID_MASK];
98 if (list == NULL) return NULL;
99 list = list->next;
100 if (list == &report_enum->report_list) return NULL;
101 rinfo->report_id = ((struct hid_report *) list)->id;
102 break;
103
104 default:
105 return NULL;
106 }
107
108 return report_enum->report_id_hash[rinfo->report_id];
109}
110
111
112
113
114
115static struct hid_field *
116hiddev_lookup_usage(struct hid_device *hid, struct hiddev_usage_ref *uref)
117{
118 int i, j;
119 struct hid_report *report;
120 struct hid_report_enum *report_enum;
121 struct list_head *list;
122 struct hid_field *field;
123
124 if (uref->report_type < HID_REPORT_TYPE_MIN ||
125 uref->report_type > HID_REPORT_TYPE_MAX) return NULL;
126
127 report_enum = hid->report_enum +
128 (uref->report_type - HID_REPORT_TYPE_MIN);
129 list = report_enum->report_list.next;
130 while (list != &report_enum->report_list) {
131 report = (struct hid_report *) list;
132 for (i = 0; i < report->maxfield; i++) {
133 field = report->field[i];
134 for (j = 0; j < field->maxusage; j++) {
135 if (field->usage[j].hid == uref->usage_code) {
136 uref->report_id = report->id;
137 uref->field_index = i;
138 uref->usage_index = j;
139 return field;
140 }
141 }
142 }
143 list = list->next;
144 }
145
146 return NULL;
147}
148
149static void hiddev_send_event(struct hid_device *hid,
150 struct hiddev_usage_ref *uref)
151{
152 struct hiddev *hiddev = hid->hiddev;
153 struct hiddev_list *list = hiddev->list;
154
155 while (list) {
156 if (uref->field_index != HID_FIELD_INDEX_NONE ||
157 (list->flags & HIDDEV_FLAG_REPORT) != 0) {
158 list->buffer[list->head] = *uref;
159 list->head = (list->head + 1) &
160 (HIDDEV_BUFFER_SIZE - 1);
161 kill_fasync(&list->fasync, SIGIO, POLL_IN);
162 }
163
164 list = list->next;
165 }
166
167 wake_up_interruptible(&hiddev->wait);
168}
169
170
171
172
173
174void hiddev_hid_event(struct hid_device *hid, struct hid_field *field,
175 struct hid_usage *usage, __s32 value)
176{
177 unsigned type = field->report_type;
178 struct hiddev_usage_ref uref;
179
180 uref.report_type =
181 (type == HID_INPUT_REPORT) ? HID_REPORT_TYPE_INPUT :
182 ((type == HID_OUTPUT_REPORT) ? HID_REPORT_TYPE_OUTPUT :
183 ((type == HID_FEATURE_REPORT) ? HID_REPORT_TYPE_FEATURE:0));
184 uref.report_id = field->report->id;
185 uref.field_index = field->index;
186 uref.usage_index = (usage - field->usage);
187 uref.usage_code = usage->hid;
188 uref.value = value;
189
190 hiddev_send_event(hid, &uref);
191}
192
193
194void hiddev_report_event(struct hid_device *hid, struct hid_report *report)
195{
196 unsigned type = report->type;
197 struct hiddev_usage_ref uref;
198
199 memset(&uref, 0, sizeof(uref));
200 uref.report_type =
201 (type == HID_INPUT_REPORT) ? HID_REPORT_TYPE_INPUT :
202 ((type == HID_OUTPUT_REPORT) ? HID_REPORT_TYPE_OUTPUT :
203 ((type == HID_FEATURE_REPORT) ? HID_REPORT_TYPE_FEATURE:0));
204 uref.report_id = report->id;
205 uref.field_index = HID_FIELD_INDEX_NONE;
206
207 hiddev_send_event(hid, &uref);
208}
209
210
211
212
213static int hiddev_fasync(int fd, struct file *file, int on)
214{
215 int retval;
216 struct hiddev_list *list = file->private_data;
217 retval = fasync_helper(fd, file, on, &list->fasync);
218 return retval < 0 ? retval : 0;
219}
220
221
222
223
224static void hiddev_cleanup(struct hiddev *hiddev)
225{
226 devfs_unregister(hiddev->devfs);
227 hiddev_table[hiddev->minor] = NULL;
228 kfree(hiddev);
229}
230
231
232
233
234static int hiddev_release(struct inode * inode, struct file * file)
235{
236 struct hiddev_list *list = file->private_data;
237 struct hiddev_list **listptr;
238
239 listptr = &list->hiddev->list;
240 hiddev_fasync(-1, file, 0);
241
242 while (*listptr && (*listptr != list))
243 listptr = &((*listptr)->next);
244 *listptr = (*listptr)->next;
245
246 if (!--list->hiddev->open) {
247 if (list->hiddev->exist)
248 hid_close(list->hiddev->hid);
249 else
250 hiddev_cleanup(list->hiddev);
251 }
252
253 kfree(list);
254
255 return 0;
256}
257
258
259
260
261static int hiddev_open(struct inode * inode, struct file * file) {
262 struct hiddev_list *list;
263
264 int i = MINOR(inode->i_rdev) - HIDDEV_MINOR_BASE;
265
266 if (i >= HIDDEV_MINORS || !hiddev_table[i])
267 return -ENODEV;
268
269 if (!(list = kmalloc(sizeof(struct hiddev_list), GFP_KERNEL)))
270 return -ENOMEM;
271 memset(list, 0, sizeof(struct hiddev_list));
272
273 list->hiddev = hiddev_table[i];
274 list->next = hiddev_table[i]->list;
275 hiddev_table[i]->list = list;
276
277 file->private_data = list;
278
279 if (!list->hiddev->open++)
280 if (list->hiddev->exist)
281 hid_open(hiddev_table[i]->hid);
282
283 return 0;
284}
285
286
287
288
289static ssize_t hiddev_write(struct file * file, const char * buffer,
290 size_t count, loff_t *ppos)
291{
292 return -EINVAL;
293}
294
295
296
297
298static ssize_t hiddev_read(struct file * file, char * buffer, size_t count,
299 loff_t *ppos)
300{
301 DECLARE_WAITQUEUE(wait, current);
302 struct hiddev_list *list = file->private_data;
303 int event_size;
304 int retval = 0;
305
306 event_size = ((list->flags & HIDDEV_FLAG_UREF) != 0) ?
307 sizeof(struct hiddev_usage_ref) : sizeof(struct hiddev_event);
308
309 if (count < event_size) return 0;
310
311 while (retval == 0) {
312 if (list->head == list->tail) {
313 add_wait_queue(&list->hiddev->wait, &wait);
314 set_current_state(TASK_INTERRUPTIBLE);
315
316 while (list->head == list->tail) {
317 if (file->f_flags & O_NONBLOCK) {
318 retval = -EAGAIN;
319 break;
320 }
321 if (signal_pending(current)) {
322 retval = -ERESTARTSYS;
323 break;
324 }
325 if (!list->hiddev->exist) {
326 retval = -EIO;
327 break;
328 }
329
330 schedule();
331 }
332
333 set_current_state(TASK_RUNNING);
334 remove_wait_queue(&list->hiddev->wait, &wait);
335 }
336
337 if (retval)
338 return retval;
339
340 while (list->head != list->tail &&
341 retval + event_size <= count) {
342 if ((list->flags & HIDDEV_FLAG_UREF) == 0) {
343 if (list->buffer[list->tail].field_index !=
344 HID_FIELD_INDEX_NONE) {
345 struct hiddev_event event;
346 event.hid = list->buffer[list->tail].usage_code;
347 event.value = list->buffer[list->tail].value;
348 if (copy_to_user(buffer + retval, &event, sizeof(struct hiddev_event)))
349 return -EFAULT;
350 retval += sizeof(struct hiddev_event);
351 }
352 } else {
353 if (list->buffer[list->tail].field_index != HID_FIELD_INDEX_NONE ||
354 (list->flags & HIDDEV_FLAG_REPORT) != 0) {
355 if (copy_to_user(buffer + retval, list->buffer + list->tail, sizeof(struct hiddev_usage_ref)))
356 return -EFAULT;
357 retval += sizeof(struct hiddev_usage_ref);
358 }
359 }
360 list->tail = (list->tail + 1) & (HIDDEV_BUFFER_SIZE - 1);
361 }
362
363 }
364
365 return retval;
366}
367
368
369
370
371
372static unsigned int hiddev_poll(struct file *file, poll_table *wait)
373{
374 struct hiddev_list *list = file->private_data;
375 poll_wait(file, &list->hiddev->wait, wait);
376 if (list->head != list->tail)
377 return POLLIN | POLLRDNORM;
378 if (!list->hiddev->exist)
379 return POLLERR | POLLHUP;
380 return 0;
381}
382
383#define GET_TIMEOUT 3
384#define SET_TIMEOUT 3
385
386
387
388
389static int hiddev_ioctl(struct inode *inode, struct file *file,
390 unsigned int cmd, unsigned long arg)
391{
392 struct hiddev_list *list = file->private_data;
393 struct hiddev *hiddev = list->hiddev;
394 struct hid_device *hid = hiddev->hid;
395 struct usb_device *dev = hid->dev;
396 struct hiddev_collection_info cinfo;
397 struct hiddev_report_info rinfo;
398 struct hiddev_field_info finfo;
399 struct hiddev_usage_ref_multi uref_multi;
400 struct hiddev_usage_ref *uref = &uref_multi.uref;
401 struct hiddev_devinfo dinfo;
402 struct hid_report *report;
403 struct hid_field *field;
404 int i;
405
406 if (!hiddev->exist) return -EIO;
407
408 switch (cmd) {
409
410 case HIDIOCGVERSION:
411 return put_user(HID_VERSION, (int *) arg);
412
413 case HIDIOCAPPLICATION:
414 if (arg < 0 || arg >= hid->maxapplication)
415 return -EINVAL;
416
417 for (i = 0; i < hid->maxcollection; i++)
418 if (hid->collection[i].type ==
419 HID_COLLECTION_APPLICATION && arg-- == 0)
420 break;
421
422 if (i == hid->maxcollection)
423 return -EINVAL;
424
425 return hid->collection[i].usage;
426
427 case HIDIOCGDEVINFO:
428 dinfo.bustype = BUS_USB;
429 dinfo.busnum = dev->bus->busnum;
430 dinfo.devnum = dev->devnum;
431 dinfo.ifnum = hid->ifnum;
432 dinfo.vendor = dev->descriptor.idVendor;
433 dinfo.product = dev->descriptor.idProduct;
434 dinfo.version = dev->descriptor.bcdDevice;
435 dinfo.num_applications = hid->maxapplication;
436 if (copy_to_user((void *) arg, &dinfo, sizeof(dinfo)))
437 return -EFAULT;
438 return 0;
439
440 case HIDIOCGFLAG:
441 return put_user(list->flags, (int *) arg);
442
443 case HIDIOCSFLAG:
444 {
445 int newflags;
446 if (get_user(newflags, (int *) arg))
447 return -EFAULT;
448
449 if ((newflags & ~HIDDEV_FLAGS) != 0 ||
450 ((newflags & HIDDEV_FLAG_REPORT) != 0 &&
451 (newflags & HIDDEV_FLAG_UREF) == 0))
452 return -EINVAL;
453
454 list->flags = newflags;
455
456 return 0;
457 }
458
459 case HIDIOCGSTRING:
460 {
461 int idx, len;
462 char *buf;
463
464 if (get_user(idx, (int *) arg))
465 return -EFAULT;
466
467 if ((buf = kmalloc(HID_STRING_SIZE, GFP_KERNEL)) == NULL)
468 return -ENOMEM;
469
470 if ((len = usb_string(dev, idx, buf, HID_STRING_SIZE-1)) < 0) {
471 kfree(buf);
472 return -EINVAL;
473 }
474
475 if (copy_to_user((void *) (arg+sizeof(int)), buf, len+1)) {
476 kfree(buf);
477 return -EFAULT;
478 }
479
480 kfree(buf);
481
482 return len;
483 }
484
485 case HIDIOCINITREPORT:
486 hid_init_reports(hid);
487
488 return 0;
489
490 case HIDIOCGREPORT:
491 if (copy_from_user(&rinfo, (void *) arg, sizeof(rinfo)))
492 return -EFAULT;
493
494 if (rinfo.report_type == HID_REPORT_TYPE_OUTPUT)
495 return -EINVAL;
496
497 if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL)
498 return -EINVAL;
499
500 hid_read_report(hid, report);
501
502 return 0;
503
504 case HIDIOCSREPORT:
505 if (copy_from_user(&rinfo, (void *) arg, sizeof(rinfo)))
506 return -EFAULT;
507
508 if (rinfo.report_type == HID_REPORT_TYPE_INPUT)
509 return -EINVAL;
510
511 if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL)
512 return -EINVAL;
513
514 hid_write_report(hid, report);
515
516 return 0;
517
518 case HIDIOCGREPORTINFO:
519 if (copy_from_user(&rinfo, (void *) arg, sizeof(rinfo)))
520 return -EFAULT;
521
522 if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL)
523 return -EINVAL;
524
525 rinfo.num_fields = report->maxfield;
526
527 if (copy_to_user((void *) arg, &rinfo, sizeof(rinfo)))
528 return -EFAULT;
529 return 0;
530
531 case HIDIOCGFIELDINFO:
532 if (copy_from_user(&finfo, (void *) arg, sizeof(finfo)))
533 return -EFAULT;
534 rinfo.report_type = finfo.report_type;
535 rinfo.report_id = finfo.report_id;
536 if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL)
537 return -EINVAL;
538
539 if (finfo.field_index >= report->maxfield)
540 return -EINVAL;
541
542 field = report->field[finfo.field_index];
543 memset(&finfo, 0, sizeof(finfo));
544 finfo.report_type = rinfo.report_type;
545 finfo.report_id = rinfo.report_id;
546 finfo.field_index = field->report_count - 1;
547 finfo.maxusage = field->maxusage;
548 finfo.flags = field->flags;
549 finfo.physical = field->physical;
550 finfo.logical = field->logical;
551 finfo.application = field->application;
552 finfo.logical_minimum = field->logical_minimum;
553 finfo.logical_maximum = field->logical_maximum;
554 finfo.physical_minimum = field->physical_minimum;
555 finfo.physical_maximum = field->physical_maximum;
556 finfo.unit_exponent = field->unit_exponent;
557 finfo.unit = field->unit;
558
559 if (copy_to_user((void *) arg, &finfo, sizeof(finfo)))
560 return -EFAULT;
561 return 0;
562
563 case HIDIOCGUCODE:
564 if (copy_from_user(uref, (void *) arg, sizeof(*uref)))
565 return -EFAULT;
566
567 rinfo.report_type = uref->report_type;
568 rinfo.report_id = uref->report_id;
569 if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL)
570 return -EINVAL;
571
572 if (uref->field_index >= report->maxfield)
573 return -EINVAL;
574
575 field = report->field[uref->field_index];
576 if (uref->usage_index >= field->maxusage)
577 return -EINVAL;
578
579 uref->usage_code = field->usage[uref->usage_index].hid;
580
581 if (copy_to_user((void *) arg, uref, sizeof(*uref)))
582 return -EFAULT;
583 return 0;
584
585 case HIDIOCGUSAGE:
586 case HIDIOCSUSAGE:
587 case HIDIOCGUSAGES:
588 case HIDIOCSUSAGES:
589 case HIDIOCGCOLLECTIONINDEX:
590 if (cmd == HIDIOCGUSAGES || cmd == HIDIOCSUSAGES) {
591 if (copy_from_user(&uref_multi, (void *) arg,
592 sizeof(uref_multi)))
593 return -EFAULT;
594 } else {
595 if (copy_from_user(uref, (void *) arg, sizeof(*uref)))
596 return -EFAULT;
597 }
598
599 if (cmd != HIDIOCGUSAGE &&
600 cmd != HIDIOCGUSAGES &&
601 uref->report_type == HID_REPORT_TYPE_INPUT)
602 return -EINVAL;
603
604 if (uref->report_id == HID_REPORT_ID_UNKNOWN) {
605 field = hiddev_lookup_usage(hid, uref);
606 if (field == NULL)
607 return -EINVAL;
608 } else {
609 rinfo.report_type = uref->report_type;
610 rinfo.report_id = uref->report_id;
611 if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL)
612 return -EINVAL;
613
614 if (uref->field_index >= report->maxfield)
615 return -EINVAL;
616
617 field = report->field[uref->field_index];
618 if (uref->usage_index >= field->maxusage)
619 return -EINVAL;
620
621 if (cmd == HIDIOCGUSAGES || cmd == HIDIOCSUSAGES) {
622 if (uref_multi.num_values >= HID_MAX_USAGES ||
623 uref->usage_index >= field->maxusage ||
624 (uref->usage_index + uref_multi.num_values) >= field->maxusage)
625 return -EINVAL;
626 }
627 }
628
629 switch (cmd) {
630 case HIDIOCGUSAGE:
631 uref->value = field->value[uref->usage_index];
632 return copy_to_user((void *) arg, uref, sizeof(*uref));
633
634 case HIDIOCSUSAGE:
635 field->value[uref->usage_index] = uref->value;
636 return 0;
637
638 case HIDIOCGCOLLECTIONINDEX:
639 return field->usage[uref->usage_index].collection_index;
640 case HIDIOCGUSAGES:
641 for (i = 0; i < uref_multi.num_values; i++)
642 uref_multi.values[i] =
643 field->value[uref->usage_index + i];
644 if (copy_to_user((void *) arg, &uref_multi,
645 sizeof(uref_multi)))
646 return -EFAULT;
647 return 0;
648 case HIDIOCSUSAGES:
649 for (i = 0; i < uref_multi.num_values; i++)
650 field->value[uref->usage_index + i] =
651 uref_multi.values[i];
652 return 0;
653 }
654 break;
655
656 case HIDIOCGCOLLECTIONINFO:
657 if (copy_from_user(&cinfo, (void *) arg, sizeof(cinfo)))
658 return -EFAULT;
659
660 if (cinfo.index >= hid->maxcollection)
661 return -EINVAL;
662
663 cinfo.type = hid->collection[cinfo.index].type;
664 cinfo.usage = hid->collection[cinfo.index].usage;
665 cinfo.level = hid->collection[cinfo.index].level;
666
667 if (copy_to_user((void *) arg, &cinfo, sizeof(cinfo)))
668 return -EFAULT;
669 return 0;
670
671 default:
672
673 if (_IOC_TYPE(cmd) != 'H' || _IOC_DIR(cmd) != _IOC_READ)
674 return -EINVAL;
675
676 if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGNAME(0))) {
677 int len;
678 if (!hid->name) return 0;
679 len = strlen(hid->name) + 1;
680 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
681 return copy_to_user((char *) arg, hid->name, len) ?
682 -EFAULT : len;
683 }
684 }
685 return -EINVAL;
686}
687
688static struct file_operations hiddev_fops = {
689 owner: THIS_MODULE,
690 read: hiddev_read,
691 write: hiddev_write,
692 poll: hiddev_poll,
693 open: hiddev_open,
694 release: hiddev_release,
695 ioctl: hiddev_ioctl,
696 fasync: hiddev_fasync,
697};
698
699
700
701
702int hiddev_connect(struct hid_device *hid)
703{
704 struct hiddev *hiddev;
705 int minor, i;
706 char devfs_name[16];
707
708
709
710 if ((hid->quirks & HID_QUIRK_HIDDEV) == 0) {
711 for (i = 0; i < hid->maxcollection; i++)
712 if (hid->collection[i].type ==
713 HID_COLLECTION_APPLICATION &&
714 !IS_INPUT_APPLICATION(hid->collection[i].usage))
715 break;
716
717 if (i == hid->maxcollection)
718 return -1;
719 }
720
721 for (minor = 0; minor < HIDDEV_MINORS && hiddev_table[minor]; minor++);
722 if (minor == HIDDEV_MINORS) {
723 printk(KERN_ERR "hiddev: no more free hiddev devices\n");
724 return -1;
725 }
726
727 if (!(hiddev = kmalloc(sizeof(struct hiddev), GFP_KERNEL)))
728 return -1;
729 memset(hiddev, 0, sizeof(struct hiddev));
730
731 init_waitqueue_head(&hiddev->wait);
732
733 hiddev->minor = minor;
734 hiddev_table[minor] = hiddev;
735
736 hiddev->hid = hid;
737 hiddev->exist = 1;
738
739 sprintf(devfs_name, "hiddev%d", minor);
740 hiddev->devfs = devfs_register(hiddev_devfs_handle, devfs_name,
741 DEVFS_FL_DEFAULT, USB_MAJOR,
742 minor + HIDDEV_MINOR_BASE,
743 S_IFCHR | S_IRUGO | S_IWUSR,
744 &hiddev_fops, NULL);
745 hid->minor = minor;
746 hid->hiddev = hiddev;
747
748 return 0;
749}
750
751
752
753
754
755void hiddev_disconnect(struct hid_device *hid)
756{
757 struct hiddev *hiddev = hid->hiddev;
758
759 hiddev->exist = 0;
760
761 if (hiddev->open) {
762 hid_close(hiddev->hid);
763 wake_up_interruptible(&hiddev->wait);
764 } else {
765 hiddev_cleanup(hiddev);
766 }
767}
768
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785
786static void *hiddev_usbd_probe(struct usb_device *dev, unsigned int ifnum,
787 const struct usb_device_id *hiddev_info)
788{
789 return NULL;
790}
791
792
793static struct usb_driver hiddev_driver = {
794 name: "hiddev",
795 probe: hiddev_usbd_probe,
796 fops: &hiddev_fops,
797 minor: HIDDEV_MINOR_BASE
798};
799
800int __init hiddev_init(void)
801{
802 hiddev_devfs_handle =
803 devfs_mk_dir(devfs_find_handle(NULL, "usb", 0, 0, 0, 0), "hid", NULL);
804 usb_register(&hiddev_driver);
805 return 0;
806}
807
808void __exit hiddev_exit(void)
809{
810 devfs_unregister(hiddev_devfs_handle);
811 usb_deregister(&hiddev_driver);
812}
813
