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Diffstat (limited to 'usr/src/dkms_source_tree/hiddev.c')
-rw-r--r--usr/src/dkms_source_tree/hiddev.c893
1 files changed, 893 insertions, 0 deletions
diff --git a/usr/src/dkms_source_tree/hiddev.c b/usr/src/dkms_source_tree/hiddev.c
new file mode 100644
index 0000000..842e9ed
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+++ b/usr/src/dkms_source_tree/hiddev.c
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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/smp_lock.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 "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 64
48
49struct hiddev {
50 int exist;
51 int open;
52 wait_queue_head_t wait;
53 struct hid_device *hid;
54 struct list_head list;
55 spinlock_t list_lock;
56};
57
58struct 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};
67
68static struct hiddev *hiddev_table[HIDDEV_MINORS];
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 */
76static struct hid_report *
77hiddev_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 */
129static struct hid_field *
130hiddev_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
161static 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 */
187void 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}
205EXPORT_SYMBOL_GPL(hiddev_hid_event);
206
207void 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 */
226static int hiddev_fasync(int fd, struct file *file, int on)
227{
228 int retval;
229 struct hiddev_list *list = file->private_data;
230
231 retval = fasync_helper(fd, file, on, &list->fasync);
232
233 return retval < 0 ? retval : 0;
234}
235
236
237/*
238 * release file op
239 */
240static int hiddev_release(struct inode * inode, struct file * file)
241{
242 struct hiddev_list *list = file->private_data;
243 unsigned long flags;
244
245 hiddev_fasync(-1, file, 0);
246
247 spin_lock_irqsave(&list->hiddev->list_lock, flags);
248 list_del(&list->node);
249 spin_unlock_irqrestore(&list->hiddev->list_lock, flags);
250
251 if (!--list->hiddev->open) {
252 if (list->hiddev->exist)
253 usbhid_close(list->hiddev->hid);
254 else
255 kfree(list->hiddev);
256 }
257
258 kfree(list);
259
260 return 0;
261}
262
263/*
264 * open file op
265 */
266static int hiddev_open(struct inode *inode, struct file *file)
267{
268 struct hiddev_list *list;
269 unsigned long flags;
270
271 int i = iminor(inode) - HIDDEV_MINOR_BASE;
272
273 if (i >= HIDDEV_MINORS || !hiddev_table[i])
274 return -ENODEV;
275
276 if (!(list = kzalloc(sizeof(struct hiddev_list), GFP_KERNEL)))
277 return -ENOMEM;
278
279 list->hiddev = hiddev_table[i];
280
281 spin_lock_irqsave(&list->hiddev->list_lock, flags);
282 list_add_tail(&list->node, &hiddev_table[i]->list);
283 spin_unlock_irqrestore(&list->hiddev->list_lock, flags);
284
285 file->private_data = list;
286
287 if (!list->hiddev->open++)
288 if (list->hiddev->exist)
289 usbhid_open(hiddev_table[i]->hid);
290
291 return 0;
292}
293
294/*
295 * "write" file op
296 */
297static ssize_t hiddev_write(struct file * file, const char __user * buffer, size_t count, loff_t *ppos)
298{
299 return -EINVAL;
300}
301
302/*
303 * "read" file op
304 */
305static ssize_t hiddev_read(struct file * file, char __user * buffer, size_t count, loff_t *ppos)
306{
307 DECLARE_WAITQUEUE(wait, current);
308 struct hiddev_list *list = file->private_data;
309 int event_size;
310 int retval = 0;
311
312 event_size = ((list->flags & HIDDEV_FLAG_UREF) != 0) ?
313 sizeof(struct hiddev_usage_ref) : sizeof(struct hiddev_event);
314
315 if (count < event_size)
316 return 0;
317
318 while (retval == 0) {
319 if (list->head == list->tail) {
320 add_wait_queue(&list->hiddev->wait, &wait);
321 set_current_state(TASK_INTERRUPTIBLE);
322
323 while (list->head == list->tail) {
324 if (file->f_flags & O_NONBLOCK) {
325 retval = -EAGAIN;
326 break;
327 }
328 if (signal_pending(current)) {
329 retval = -ERESTARTSYS;
330 break;
331 }
332 if (!list->hiddev->exist) {
333 retval = -EIO;
334 break;
335 }
336
337 schedule();
338 set_current_state(TASK_INTERRUPTIBLE);
339 }
340
341 set_current_state(TASK_RUNNING);
342 remove_wait_queue(&list->hiddev->wait, &wait);
343 }
344
345 if (retval)
346 return retval;
347
348
349 while (list->head != list->tail &&
350 retval + event_size <= count) {
351 if ((list->flags & HIDDEV_FLAG_UREF) == 0) {
352 if (list->buffer[list->tail].field_index !=
353 HID_FIELD_INDEX_NONE) {
354 struct hiddev_event event;
355 event.hid = list->buffer[list->tail].usage_code;
356 event.value = list->buffer[list->tail].value;
357 if (copy_to_user(buffer + retval, &event, sizeof(struct hiddev_event)))
358 return -EFAULT;
359 retval += sizeof(struct hiddev_event);
360 }
361 } else {
362 if (list->buffer[list->tail].field_index != HID_FIELD_INDEX_NONE ||
363 (list->flags & HIDDEV_FLAG_REPORT) != 0) {
364 if (copy_to_user(buffer + retval, list->buffer + list->tail, sizeof(struct hiddev_usage_ref)))
365 return -EFAULT;
366 retval += sizeof(struct hiddev_usage_ref);
367 }
368 }
369 list->tail = (list->tail + 1) & (HIDDEV_BUFFER_SIZE - 1);
370 }
371
372 }
373
374 return retval;
375}
376
377/*
378 * "poll" file op
379 * No kernel lock - fine
380 */
381static unsigned int hiddev_poll(struct file *file, poll_table *wait)
382{
383 struct hiddev_list *list = file->private_data;
384
385 poll_wait(file, &list->hiddev->wait, wait);
386 if (list->head != list->tail)
387 return POLLIN | POLLRDNORM;
388 if (!list->hiddev->exist)
389 return POLLERR | POLLHUP;
390 return 0;
391}
392
393/*
394 * "ioctl" file op
395 */
396static noinline int hiddev_ioctl_usage(struct hiddev *hiddev, unsigned int cmd, void __user *user_arg)
397{
398 struct hid_device *hid = hiddev->hid;
399 struct hiddev_report_info rinfo;
400 struct hiddev_usage_ref_multi *uref_multi = NULL;
401 struct hiddev_usage_ref *uref;
402 struct hid_report *report;
403 struct hid_field *field;
404 int i;
405
406 uref_multi = kmalloc(sizeof(struct hiddev_usage_ref_multi), GFP_KERNEL);
407 if (!uref_multi)
408 return -ENOMEM;
409 lock_kernel();
410 uref = &uref_multi->uref;
411 if (cmd == HIDIOCGUSAGES || cmd == HIDIOCSUSAGES) {
412 if (copy_from_user(uref_multi, user_arg,
413 sizeof(*uref_multi)))
414 goto fault;
415 } else {
416 if (copy_from_user(uref, user_arg, sizeof(*uref)))
417 goto fault;
418 }
419
420 switch (cmd) {
421 case HIDIOCGUCODE:
422 rinfo.report_type = uref->report_type;
423 rinfo.report_id = uref->report_id;
424 if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL)
425 goto inval;
426
427 if (uref->field_index >= report->maxfield)
428 goto inval;
429
430 field = report->field[uref->field_index];
431 if (uref->usage_index >= field->maxusage)
432 goto inval;
433
434 uref->usage_code = field->usage[uref->usage_index].hid;
435
436 if (copy_to_user(user_arg, uref, sizeof(*uref)))
437 goto fault;
438
439 kfree(uref_multi);
440 return 0;
441
442 default:
443 if (cmd != HIDIOCGUSAGE &&
444 cmd != HIDIOCGUSAGES &&
445 uref->report_type == HID_REPORT_TYPE_INPUT)
446 goto inval;
447
448 if (uref->report_id == HID_REPORT_ID_UNKNOWN) {
449 field = hiddev_lookup_usage(hid, uref);
450 if (field == NULL)
451 goto inval;
452 } else {
453 rinfo.report_type = uref->report_type;
454 rinfo.report_id = uref->report_id;
455 if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL)
456 goto inval;
457
458 if (uref->field_index >= report->maxfield)
459 goto inval;
460
461 field = report->field[uref->field_index];
462
463 if (cmd == HIDIOCGCOLLECTIONINDEX) {
464 if (uref->usage_index >= field->maxusage)
465 goto inval;
466 } else if (uref->usage_index >= field->report_count)
467 goto inval;
468
469 else if ((cmd == HIDIOCGUSAGES || cmd == HIDIOCSUSAGES) &&
470 (uref_multi->num_values > HID_MAX_MULTI_USAGES ||
471 uref->usage_index + uref_multi->num_values > field->report_count))
472 goto inval;
473 }
474
475 switch (cmd) {
476 case HIDIOCGUSAGE:
477 uref->value = field->value[uref->usage_index];
478 if (copy_to_user(user_arg, uref, sizeof(*uref)))
479 goto fault;
480 goto goodreturn;
481
482 case HIDIOCSUSAGE:
483 field->value[uref->usage_index] = uref->value;
484 goto goodreturn;
485
486 case HIDIOCGCOLLECTIONINDEX:
487 kfree(uref_multi);
488 return field->usage[uref->usage_index].collection_index;
489 case HIDIOCGUSAGES:
490 for (i = 0; i < uref_multi->num_values; i++)
491 uref_multi->values[i] =
492 field->value[uref->usage_index + i];
493 if (copy_to_user(user_arg, uref_multi,
494 sizeof(*uref_multi)))
495 goto fault;
496 goto goodreturn;
497 case HIDIOCSUSAGES:
498 for (i = 0; i < uref_multi->num_values; i++)
499 field->value[uref->usage_index + i] =
500 uref_multi->values[i];
501 goto goodreturn;
502 }
503
504goodreturn:
505 unlock_kernel();
506 kfree(uref_multi);
507 return 0;
508fault:
509 unlock_kernel();
510 kfree(uref_multi);
511 return -EFAULT;
512inval:
513 unlock_kernel();
514 kfree(uref_multi);
515 return -EINVAL;
516 }
517}
518
519static noinline int hiddev_ioctl_string(struct hiddev *hiddev, unsigned int cmd, void __user *user_arg)
520{
521 struct hid_device *hid = hiddev->hid;
522 struct usb_device *dev = hid_to_usb_dev(hid);
523 int idx, len;
524 char *buf;
525
526 if (get_user(idx, (int __user *)user_arg))
527 return -EFAULT;
528
529 if ((buf = kmalloc(HID_STRING_SIZE, GFP_KERNEL)) == NULL)
530 return -ENOMEM;
531
532 if ((len = usb_string(dev, idx, buf, HID_STRING_SIZE-1)) < 0) {
533 kfree(buf);
534 return -EINVAL;
535 }
536
537 if (copy_to_user(user_arg+sizeof(int), buf, len+1)) {
538 kfree(buf);
539 return -EFAULT;
540 }
541
542 kfree(buf);
543
544 return len;
545}
546
547static long hiddev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
548{
549 struct hiddev_list *list = file->private_data;
550 struct hiddev *hiddev = list->hiddev;
551 struct hid_device *hid = hiddev->hid;
552 struct usb_device *dev = hid_to_usb_dev(hid);
553 struct hiddev_collection_info cinfo;
554 struct hiddev_report_info rinfo;
555 struct hiddev_field_info finfo;
556 struct hiddev_devinfo dinfo;
557 struct hid_report *report;
558 struct hid_field *field;
559 struct usbhid_device *usbhid = hid->driver_data;
560 void __user *user_arg = (void __user *)arg;
561 int i;
562
563 /* Called without BKL by compat methods so no BKL taken */
564
565 /* FIXME: Who or what stop this racing with a disconnect ?? */
566 if (!hiddev->exist)
567 return -EIO;
568
569 switch (cmd) {
570
571 case HIDIOCGVERSION:
572 return put_user(HID_VERSION, (int __user *)arg);
573
574 case HIDIOCAPPLICATION:
575 if (arg < 0 || arg >= hid->maxapplication)
576 return -EINVAL;
577
578 for (i = 0; i < hid->maxcollection; i++)
579 if (hid->collection[i].type ==
580 HID_COLLECTION_APPLICATION && arg-- == 0)
581 break;
582
583 if (i == hid->maxcollection)
584 return -EINVAL;
585
586 return hid->collection[i].usage;
587
588 case HIDIOCGDEVINFO:
589 dinfo.bustype = BUS_USB;
590 dinfo.busnum = dev->bus->busnum;
591 dinfo.devnum = dev->devnum;
592 dinfo.ifnum = usbhid->ifnum;
593 dinfo.vendor = le16_to_cpu(dev->descriptor.idVendor);
594 dinfo.product = le16_to_cpu(dev->descriptor.idProduct);
595 dinfo.version = le16_to_cpu(dev->descriptor.bcdDevice);
596 dinfo.num_applications = hid->maxapplication;
597 if (copy_to_user(user_arg, &dinfo, sizeof(dinfo)))
598 return -EFAULT;
599
600 return 0;
601
602 case HIDIOCGFLAG:
603 if (put_user(list->flags, (int __user *)arg))
604 return -EFAULT;
605
606 return 0;
607
608 case HIDIOCSFLAG:
609 {
610 int newflags;
611 if (get_user(newflags, (int __user *)arg))
612 return -EFAULT;
613
614 if ((newflags & ~HIDDEV_FLAGS) != 0 ||
615 ((newflags & HIDDEV_FLAG_REPORT) != 0 &&
616 (newflags & HIDDEV_FLAG_UREF) == 0))
617 return -EINVAL;
618
619 list->flags = newflags;
620
621 return 0;
622 }
623
624 case HIDIOCGSTRING:
625 return hiddev_ioctl_string(hiddev, cmd, user_arg);
626
627 case HIDIOCINITREPORT:
628 usbhid_init_reports(hid);
629
630 return 0;
631
632 case HIDIOCGREPORT:
633 if (copy_from_user(&rinfo, user_arg, sizeof(rinfo)))
634 return -EFAULT;
635
636 if (rinfo.report_type == HID_REPORT_TYPE_OUTPUT)
637 return -EINVAL;
638
639 if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL)
640 return -EINVAL;
641
642 usbhid_submit_report(hid, report, USB_DIR_IN);
643 usbhid_wait_io(hid);
644
645 return 0;
646
647 case HIDIOCSREPORT:
648 if (copy_from_user(&rinfo, user_arg, sizeof(rinfo)))
649 return -EFAULT;
650
651 if (rinfo.report_type == HID_REPORT_TYPE_INPUT)
652 return -EINVAL;
653
654 if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL)
655 return -EINVAL;
656
657 usbhid_submit_report(hid, report, USB_DIR_OUT);
658 usbhid_wait_io(hid);
659
660 return 0;
661
662 case HIDIOCGREPORTINFO:
663 if (copy_from_user(&rinfo, user_arg, sizeof(rinfo)))
664 return -EFAULT;
665
666 if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL)
667 return -EINVAL;
668
669 rinfo.num_fields = report->maxfield;
670
671 if (copy_to_user(user_arg, &rinfo, sizeof(rinfo)))
672 return -EFAULT;
673
674 return 0;
675
676 case HIDIOCGFIELDINFO:
677 if (copy_from_user(&finfo, user_arg, sizeof(finfo)))
678 return -EFAULT;
679 rinfo.report_type = finfo.report_type;
680 rinfo.report_id = finfo.report_id;
681 if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL)
682 return -EINVAL;
683
684 if (finfo.field_index >= report->maxfield)
685 return -EINVAL;
686
687 field = report->field[finfo.field_index];
688 memset(&finfo, 0, sizeof(finfo));
689 finfo.report_type = rinfo.report_type;
690 finfo.report_id = rinfo.report_id;
691 finfo.field_index = field->report_count - 1;
692 finfo.maxusage = field->maxusage;
693 finfo.flags = field->flags;
694 finfo.physical = field->physical;
695 finfo.logical = field->logical;
696 finfo.application = field->application;
697 finfo.logical_minimum = field->logical_minimum;
698 finfo.logical_maximum = field->logical_maximum;
699 finfo.physical_minimum = field->physical_minimum;
700 finfo.physical_maximum = field->physical_maximum;
701 finfo.unit_exponent = field->unit_exponent;
702 finfo.unit = field->unit;
703
704 if (copy_to_user(user_arg, &finfo, sizeof(finfo)))
705 return -EFAULT;
706
707 return 0;
708
709 case HIDIOCGUCODE:
710 /* fall through */
711 case HIDIOCGUSAGE:
712 case HIDIOCSUSAGE:
713 case HIDIOCGUSAGES:
714 case HIDIOCSUSAGES:
715 case HIDIOCGCOLLECTIONINDEX:
716 return hiddev_ioctl_usage(hiddev, cmd, user_arg);
717
718 case HIDIOCGCOLLECTIONINFO:
719 if (copy_from_user(&cinfo, user_arg, sizeof(cinfo)))
720 return -EFAULT;
721
722 if (cinfo.index >= hid->maxcollection)
723 return -EINVAL;
724
725 cinfo.type = hid->collection[cinfo.index].type;
726 cinfo.usage = hid->collection[cinfo.index].usage;
727 cinfo.level = hid->collection[cinfo.index].level;
728
729 if (copy_to_user(user_arg, &cinfo, sizeof(cinfo)))
730 return -EFAULT;
731 return 0;
732
733 default:
734
735 if (_IOC_TYPE(cmd) != 'H' || _IOC_DIR(cmd) != _IOC_READ)
736 return -EINVAL;
737
738 if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGNAME(0))) {
739 int len;
740 if (!hid->name)
741 return 0;
742 len = strlen(hid->name) + 1;
743 if (len > _IOC_SIZE(cmd))
744 len = _IOC_SIZE(cmd);
745 return copy_to_user(user_arg, hid->name, len) ?
746 -EFAULT : len;
747 }
748
749 if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGPHYS(0))) {
750 int len;
751 if (!hid->phys)
752 return 0;
753 len = strlen(hid->phys) + 1;
754 if (len > _IOC_SIZE(cmd))
755 len = _IOC_SIZE(cmd);
756 return copy_to_user(user_arg, hid->phys, len) ?
757 -EFAULT : len;
758 }
759 }
760 return -EINVAL;
761}
762
763#ifdef CONFIG_COMPAT
764static long hiddev_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
765{
766 return hiddev_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
767}
768#endif
769
770static const struct file_operations hiddev_fops = {
771 .owner = THIS_MODULE,
772 .read = hiddev_read,
773 .write = hiddev_write,
774 .poll = hiddev_poll,
775 .open = hiddev_open,
776 .release = hiddev_release,
777 .unlocked_ioctl = hiddev_ioctl,
778 .fasync = hiddev_fasync,
779#ifdef CONFIG_COMPAT
780 .compat_ioctl = hiddev_compat_ioctl,
781#endif
782};
783
784static struct usb_class_driver hiddev_class = {
785 .name = "hiddev%d",
786 .fops = &hiddev_fops,
787 .minor_base = HIDDEV_MINOR_BASE,
788};
789
790/*
791 * This is where hid.c calls us to connect a hid device to the hiddev driver
792 */
793int hiddev_connect(struct hid_device *hid)
794{
795 struct hiddev *hiddev;
796 struct usbhid_device *usbhid = hid->driver_data;
797 int i;
798 int retval;
799
800 for (i = 0; i < hid->maxcollection; i++)
801 if (hid->collection[i].type ==
802 HID_COLLECTION_APPLICATION &&
803 !IS_INPUT_APPLICATION(hid->collection[i].usage))
804 break;
805
806 if (i == hid->maxcollection && (hid->quirks & HID_QUIRK_HIDDEV) == 0)
807 return -1;
808
809 if (!(hiddev = kzalloc(sizeof(struct hiddev), GFP_KERNEL)))
810 return -1;
811
812 retval = usb_register_dev(usbhid->intf, &hiddev_class);
813 if (retval) {
814 err_hid("Not able to get a minor for this device.");
815 kfree(hiddev);
816 return -1;
817 }
818
819 init_waitqueue_head(&hiddev->wait);
820 INIT_LIST_HEAD(&hiddev->list);
821 spin_lock_init(&hiddev->list_lock);
822 hiddev->hid = hid;
823 hiddev->exist = 1;
824
825 hid->minor = usbhid->intf->minor;
826 hid->hiddev = hiddev;
827
828 hiddev_table[usbhid->intf->minor - HIDDEV_MINOR_BASE] = hiddev;
829
830 return 0;
831}
832
833/*
834 * This is where hid.c calls us to disconnect a hiddev device from the
835 * corresponding hid device (usually because the usb device has disconnected)
836 */
837static struct usb_class_driver hiddev_class;
838void hiddev_disconnect(struct hid_device *hid)
839{
840 struct hiddev *hiddev = hid->hiddev;
841 struct usbhid_device *usbhid = hid->driver_data;
842
843 hiddev->exist = 0;
844
845 hiddev_table[hiddev->hid->minor - HIDDEV_MINOR_BASE] = NULL;
846 usb_deregister_dev(usbhid->intf, &hiddev_class);
847
848 if (hiddev->open) {
849 usbhid_close(hiddev->hid);
850 wake_up_interruptible(&hiddev->wait);
851 } else {
852 kfree(hiddev);
853 }
854}
855
856/* Currently this driver is a USB driver. It's not a conventional one in
857 * the sense that it doesn't probe at the USB level. Instead it waits to
858 * be connected by HID through the hiddev_connect / hiddev_disconnect
859 * routines. The reason to register as a USB device is to gain part of the
860 * minor number space from the USB major.
861 *
862 * In theory, should the HID code be generalized to more than one physical
863 * medium (say, IEEE 1384), this driver will probably need to register its
864 * own major number, and in doing so, no longer need to register with USB.
865 * At that point the probe routine and hiddev_driver struct below will no
866 * longer be useful.
867 */
868
869
870/* We never attach in this manner, and rely on HID to connect us. This
871 * is why there is no disconnect routine defined in the usb_driver either.
872 */
873static int hiddev_usbd_probe(struct usb_interface *intf,
874 const struct usb_device_id *hiddev_info)
875{
876 return -ENODEV;
877}
878
879
880static /* const */ struct usb_driver hiddev_driver = {
881 .name = "hiddev",
882 .probe = hiddev_usbd_probe,
883};
884
885int __init hiddev_init(void)
886{
887 return usb_register(&hiddev_driver);
888}
889
890void hiddev_exit(void)
891{
892 usb_deregister(&hiddev_driver);
893}
generated by cgit v1.2.3 (git 2.39.1) at 2026-09-20 19:52:37 +0000