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[PATCH] Generic HID layer - API
[linux-2.6.git] / drivers / usb / input / hiddev.c
blob07d7996575cda5ab1b10ea933584e86f61bbe089
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 "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 64
47
48 struct hiddev {
49 int exist;
50 int open;
51 wait_queue_head_t wait;
52 struct hid_device *hid;
53 struct list_head list;
54 };
55
56 struct hiddev_list {
57 struct hiddev_usage_ref buffer[HIDDEV_BUFFER_SIZE];
58 int head;
59 int tail;
60 unsigned flags;
61 struct fasync_struct *fasync;
62 struct hiddev *hiddev;
63 struct list_head node;
64 };
65
66 static struct hiddev *hiddev_table[HIDDEV_MINORS];
67
68 /*
69 * Find a report, given the report's type and ID. The ID can be specified
70 * indirectly by REPORT_ID_FIRST (which returns the first report of the given
71 * type) or by (REPORT_ID_NEXT | old_id), which returns the next report of the
72 * given type which follows old_id.
73 */
74 static struct hid_report *
75 hiddev_lookup_report(struct hid_device *hid, struct hiddev_report_info *rinfo)
76 {
77 unsigned int flags = rinfo->report_id & ~HID_REPORT_ID_MASK;
78 unsigned int rid = rinfo->report_id & HID_REPORT_ID_MASK;
79 struct hid_report_enum *report_enum;
80 struct hid_report *report;
81 struct list_head *list;
82
83 if (rinfo->report_type < HID_REPORT_TYPE_MIN ||
84 rinfo->report_type > HID_REPORT_TYPE_MAX)
85 return NULL;
86
87 report_enum = hid->report_enum +
88 (rinfo->report_type - HID_REPORT_TYPE_MIN);
89
90 switch (flags) {
91 case 0: /* Nothing to do -- report_id is already set correctly */
92 break;
93
94 case HID_REPORT_ID_FIRST:
95 if (list_empty(&report_enum->report_list))
96 return NULL;
97
98 list = report_enum->report_list.next;
99 report = list_entry(list, struct hid_report, list);
100 rinfo->report_id = report->id;
101 break;
102
103 case HID_REPORT_ID_NEXT:
104 report = report_enum->report_id_hash[rid];
105 if (!report)
106 return NULL;
107
108 list = report->list.next;
109 if (list == &report_enum->report_list)
110 return NULL;
111
112 report = list_entry(list, struct hid_report, list);
113 rinfo->report_id = report->id;
114 break;
115
116 default:
117 return NULL;
118 }
119
120 return report_enum->report_id_hash[rinfo->report_id];
121 }
122
123 /*
124 * Perform an exhaustive search of the report table for a usage, given its
125 * type and usage id.
126 */
127 static struct hid_field *
128 hiddev_lookup_usage(struct hid_device *hid, struct hiddev_usage_ref *uref)
129 {
130 int i, j;
131 struct hid_report *report;
132 struct hid_report_enum *report_enum;
133 struct hid_field *field;
134
135 if (uref->report_type < HID_REPORT_TYPE_MIN ||
136 uref->report_type > HID_REPORT_TYPE_MAX)
137 return NULL;
138
139 report_enum = hid->report_enum +
140 (uref->report_type - HID_REPORT_TYPE_MIN);
141
142 list_for_each_entry(report, &report_enum->report_list, list) {
143 for (i = 0; i < report->maxfield; i++) {
144 field = report->field[i];
145 for (j = 0; j < field->maxusage; j++) {
146 if (field->usage[j].hid == uref->usage_code) {
147 uref->report_id = report->id;
148 uref->field_index = i;
149 uref->usage_index = j;
150 return field;
151 }
152 }
153 }
154 }
155
156 return NULL;
157 }
158
159 static void hiddev_send_event(struct hid_device *hid,
160 struct hiddev_usage_ref *uref)
161 {
162 struct hiddev *hiddev = hid->hiddev;
163 struct hiddev_list *list;
164
165 list_for_each_entry(list, &hiddev->list, node) {
166 if (uref->field_index != HID_FIELD_INDEX_NONE ||
167 (list->flags & HIDDEV_FLAG_REPORT) != 0) {
168 list->buffer[list->head] = *uref;
169 list->head = (list->head + 1) &
170 (HIDDEV_BUFFER_SIZE - 1);
171 kill_fasync(&list->fasync, SIGIO, POLL_IN);
172 }
173 }
174
175 wake_up_interruptible(&hiddev->wait);
176 }
177
178 /*
179 * This is where hid.c calls into hiddev to pass an event that occurred over
180 * the interrupt pipe
181 */
182 void hiddev_hid_event(struct hid_device *hid, struct hid_field *field,
183 struct hid_usage *usage, __s32 value)
184 {
185 unsigned type = field->report_type;
186 struct hiddev_usage_ref uref;
187
188 uref.report_type =
189 (type == HID_INPUT_REPORT) ? HID_REPORT_TYPE_INPUT :
190 ((type == HID_OUTPUT_REPORT) ? HID_REPORT_TYPE_OUTPUT :
191 ((type == HID_FEATURE_REPORT) ? HID_REPORT_TYPE_FEATURE : 0));
192 uref.report_id = field->report->id;
193 uref.field_index = field->index;
194 uref.usage_index = (usage - field->usage);
195 uref.usage_code = usage->hid;
196 uref.value = value;
197
198 hiddev_send_event(hid, &uref);
199 }
200 EXPORT_SYMBOL_GPL(hiddev_hid_event);
201
202 void hiddev_report_event(struct hid_device *hid, struct hid_report *report)
203 {
204 unsigned type = report->type;
205 struct hiddev_usage_ref uref;
206
207 memset(&uref, 0, sizeof(uref));
208 uref.report_type =
209 (type == HID_INPUT_REPORT) ? HID_REPORT_TYPE_INPUT :
210 ((type == HID_OUTPUT_REPORT) ? HID_REPORT_TYPE_OUTPUT :
211 ((type == HID_FEATURE_REPORT) ? HID_REPORT_TYPE_FEATURE : 0));
212 uref.report_id = report->id;
213 uref.field_index = HID_FIELD_INDEX_NONE;
214
215 hiddev_send_event(hid, &uref);
216 }
217 /*
218 * fasync file op
219 */
220 static int hiddev_fasync(int fd, struct file *file, int on)
221 {
222 int retval;
223 struct hiddev_list *list = file->private_data;
224
225 retval = fasync_helper(fd, file, on, &list->fasync);
226
227 return retval < 0 ? retval : 0;
228 }
229
230
231 /*
232 * release file op
233 */
234 static int hiddev_release(struct inode * inode, struct file * file)
235 {
236 struct hiddev_list *list = file->private_data;
237
238 hiddev_fasync(-1, file, 0);
239 list_del(&list->node);
240
241 if (!--list->hiddev->open) {
242 if (list->hiddev->exist)
243 hid_close(list->hiddev->hid);
244 else
245 kfree(list->hiddev);
246 }
247
248 kfree(list);
249
250 return 0;
251 }
252
253 /*
254 * open file op
255 */
256 static int hiddev_open(struct inode *inode, struct file *file)
257 {
258 struct hiddev_list *list;
259
260 int i = iminor(inode) - HIDDEV_MINOR_BASE;
261
262 if (i >= HIDDEV_MINORS || !hiddev_table[i])
263 return -ENODEV;
264
265 if (!(list = kzalloc(sizeof(struct hiddev_list), GFP_KERNEL)))
266 return -ENOMEM;
267
268 list->hiddev = hiddev_table[i];
269 list_add_tail(&list->node, &hiddev_table[i]->list);
270 file->private_data = list;
271
272 if (!list->hiddev->open++)
273 if (list->hiddev->exist)
274 hid_open(hiddev_table[i]->hid);
275
276 return 0;
277 }
278
279 /*
280 * "write" file op
281 */
282 static ssize_t hiddev_write(struct file * file, const char __user * buffer, size_t count, loff_t *ppos)
283 {
284 return -EINVAL;
285 }
286
287 /*
288 * "read" file op
289 */
290 static ssize_t hiddev_read(struct file * file, char __user * buffer, size_t count, loff_t *ppos)
291 {
292 DECLARE_WAITQUEUE(wait, current);
293 struct hiddev_list *list = file->private_data;
294 int event_size;
295 int retval = 0;
296
297 event_size = ((list->flags & HIDDEV_FLAG_UREF) != 0) ?
298 sizeof(struct hiddev_usage_ref) : sizeof(struct hiddev_event);
299
300 if (count < event_size)
301 return 0;
302
303 while (retval == 0) {
304 if (list->head == list->tail) {
305 add_wait_queue(&list->hiddev->wait, &wait);
306 set_current_state(TASK_INTERRUPTIBLE);
307
308 while (list->head == list->tail) {
309 if (file->f_flags & O_NONBLOCK) {
310 retval = -EAGAIN;
311 break;
312 }
313 if (signal_pending(current)) {
314 retval = -ERESTARTSYS;
315 break;
316 }
317 if (!list->hiddev->exist) {
318 retval = -EIO;
319 break;
320 }
321
322 schedule();
323 set_current_state(TASK_INTERRUPTIBLE);
324 }
325
326 set_current_state(TASK_RUNNING);
327 remove_wait_queue(&list->hiddev->wait, &wait);
328 }
329
330 if (retval)
331 return retval;
332
333
334 while (list->head != list->tail &&
335 retval + event_size <= count) {
336 if ((list->flags & HIDDEV_FLAG_UREF) == 0) {
337 if (list->buffer[list->tail].field_index !=
338 HID_FIELD_INDEX_NONE) {
339 struct hiddev_event event;
340 event.hid = list->buffer[list->tail].usage_code;
341 event.value = list->buffer[list->tail].value;
342 if (copy_to_user(buffer + retval, &event, sizeof(struct hiddev_event)))
343 return -EFAULT;
344 retval += sizeof(struct hiddev_event);
345 }
346 } else {
347 if (list->buffer[list->tail].field_index != HID_FIELD_INDEX_NONE ||
348 (list->flags & HIDDEV_FLAG_REPORT) != 0) {
349 if (copy_to_user(buffer + retval, list->buffer + list->tail, sizeof(struct hiddev_usage_ref)))
350 return -EFAULT;
351 retval += sizeof(struct hiddev_usage_ref);
352 }
353 }
354 list->tail = (list->tail + 1) & (HIDDEV_BUFFER_SIZE - 1);
355 }
356
357 }
358
359 return retval;
360 }
361
362 /*
363 * "poll" file op
364 * No kernel lock - fine
365 */
366 static unsigned int hiddev_poll(struct file *file, poll_table *wait)
367 {
368 struct hiddev_list *list = file->private_data;
369
370 poll_wait(file, &list->hiddev->wait, wait);
371 if (list->head != list->tail)
372 return POLLIN | POLLRDNORM;
373 if (!list->hiddev->exist)
374 return POLLERR | POLLHUP;
375 return 0;
376 }
377
378 /*
379 * "ioctl" file op
380 */
381 static int hiddev_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
382 {
383 struct hiddev_list *list = file->private_data;
384 struct hiddev *hiddev = list->hiddev;
385 struct hid_device *hid = hiddev->hid;
386 struct usb_device *dev = hid->dev;
387 struct hiddev_collection_info cinfo;
388 struct hiddev_report_info rinfo;
389 struct hiddev_field_info finfo;
390 struct hiddev_usage_ref_multi *uref_multi = NULL;
391 struct hiddev_usage_ref *uref;
392 struct hiddev_devinfo dinfo;
393 struct hid_report *report;
394 struct hid_field *field;
395 void __user *user_arg = (void __user *)arg;
396 int i;
397
398 if (!hiddev->exist)
399 return -EIO;
400
401 switch (cmd) {
402
403 case HIDIOCGVERSION:
404 return put_user(HID_VERSION, (int __user *)arg);
405
406 case HIDIOCAPPLICATION:
407 if (arg < 0 || arg >= hid->maxapplication)
408 return -EINVAL;
409
410 for (i = 0; i < hid->maxcollection; i++)
411 if (hid->collection[i].type ==
412 HID_COLLECTION_APPLICATION && arg-- == 0)
413 break;
414
415 if (i == hid->maxcollection)
416 return -EINVAL;
417
418 return hid->collection[i].usage;
419
420 case HIDIOCGDEVINFO:
421 dinfo.bustype = BUS_USB;
422 dinfo.busnum = dev->bus->busnum;
423 dinfo.devnum = dev->devnum;
424 dinfo.ifnum = hid->ifnum;
425 dinfo.vendor = le16_to_cpu(dev->descriptor.idVendor);
426 dinfo.product = le16_to_cpu(dev->descriptor.idProduct);
427 dinfo.version = le16_to_cpu(dev->descriptor.bcdDevice);
428 dinfo.num_applications = hid->maxapplication;
429 if (copy_to_user(user_arg, &dinfo, sizeof(dinfo)))
430 return -EFAULT;
431
432 return 0;
433
434 case HIDIOCGFLAG:
435 if (put_user(list->flags, (int __user *)arg))
436 return -EFAULT;
437
438 return 0;
439
440 case HIDIOCSFLAG:
441 {
442 int newflags;
443 if (get_user(newflags, (int __user *)arg))
444 return -EFAULT;
445
446 if ((newflags & ~HIDDEV_FLAGS) != 0 ||
447 ((newflags & HIDDEV_FLAG_REPORT) != 0 &&
448 (newflags & HIDDEV_FLAG_UREF) == 0))
449 return -EINVAL;
450
451 list->flags = newflags;
452
453 return 0;
454 }
455
456 case HIDIOCGSTRING:
457 {
458 int idx, len;
459 char *buf;
460
461 if (get_user(idx, (int __user *)arg))
462 return -EFAULT;
463
464 if ((buf = kmalloc(HID_STRING_SIZE, GFP_KERNEL)) == NULL)
465 return -ENOMEM;
466
467 if ((len = usb_string(dev, idx, buf, HID_STRING_SIZE-1)) < 0) {
468 kfree(buf);
469 return -EINVAL;
470 }
471
472 if (copy_to_user(user_arg+sizeof(int), buf, len+1)) {
473 kfree(buf);
474 return -EFAULT;
475 }
476
477 kfree(buf);
478
479 return len;
480 }
481
482 case HIDIOCINITREPORT:
483 hid_init_reports(hid);
484
485 return 0;
486
487 case HIDIOCGREPORT:
488 if (copy_from_user(&rinfo, user_arg, sizeof(rinfo)))
489 return -EFAULT;
490
491 if (rinfo.report_type == HID_REPORT_TYPE_OUTPUT)
492 return -EINVAL;
493
494 if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL)
495 return -EINVAL;
496
497 hid_submit_report(hid, report, USB_DIR_IN);
498 hid_wait_io(hid);
499
500 return 0;
501
502 case HIDIOCSREPORT:
503 if (copy_from_user(&rinfo, user_arg, sizeof(rinfo)))
504 return -EFAULT;
505
506 if (rinfo.report_type == HID_REPORT_TYPE_INPUT)
507 return -EINVAL;
508
509 if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL)
510 return -EINVAL;
511
512 hid_submit_report(hid, report, USB_DIR_OUT);
513 hid_wait_io(hid);
514
515 return 0;
516
517 case HIDIOCGREPORTINFO:
518 if (copy_from_user(&rinfo, user_arg, sizeof(rinfo)))
519 return -EFAULT;
520
521 if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL)
522 return -EINVAL;
523
524 rinfo.num_fields = report->maxfield;
525
526 if (copy_to_user(user_arg, &rinfo, sizeof(rinfo)))
527 return -EFAULT;
528
529 return 0;
530
531 case HIDIOCGFIELDINFO:
532 if (copy_from_user(&finfo, user_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(user_arg, &finfo, sizeof(finfo)))
560 return -EFAULT;
561
562 return 0;
563
564 case HIDIOCGUCODE:
565 uref_multi = kmalloc(sizeof(struct hiddev_usage_ref_multi), GFP_KERNEL);
566 if (!uref_multi)
567 return -ENOMEM;
568 uref = &uref_multi->uref;
569 if (copy_from_user(uref, user_arg, sizeof(*uref)))
570 goto fault;
571
572 rinfo.report_type = uref->report_type;
573 rinfo.report_id = uref->report_id;
574 if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL)
575 goto inval;
576
577 if (uref->field_index >= report->maxfield)
578 goto inval;
579
580 field = report->field[uref->field_index];
581 if (uref->usage_index >= field->maxusage)
582 goto inval;
583
584 uref->usage_code = field->usage[uref->usage_index].hid;
585
586 if (copy_to_user(user_arg, uref, sizeof(*uref)))
587 goto fault;
588
589 kfree(uref_multi);
590 return 0;
591
592 case HIDIOCGUSAGE:
593 case HIDIOCSUSAGE:
594 case HIDIOCGUSAGES:
595 case HIDIOCSUSAGES:
596 case HIDIOCGCOLLECTIONINDEX:
597 uref_multi = kmalloc(sizeof(struct hiddev_usage_ref_multi), GFP_KERNEL);
598 if (!uref_multi)
599 return -ENOMEM;
600 uref = &uref_multi->uref;
601 if (cmd == HIDIOCGUSAGES || cmd == HIDIOCSUSAGES) {
602 if (copy_from_user(uref_multi, user_arg,
603 sizeof(*uref_multi)))
604 goto fault;
605 } else {
606 if (copy_from_user(uref, user_arg, sizeof(*uref)))
607 goto fault;
608 }
609
610 if (cmd != HIDIOCGUSAGE &&
611 cmd != HIDIOCGUSAGES &&
612 uref->report_type == HID_REPORT_TYPE_INPUT)
613 goto inval;
614
615 if (uref->report_id == HID_REPORT_ID_UNKNOWN) {
616 field = hiddev_lookup_usage(hid, uref);
617 if (field == NULL)
618 goto inval;
619 } else {
620 rinfo.report_type = uref->report_type;
621 rinfo.report_id = uref->report_id;
622 if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL)
623 goto inval;
624
625 if (uref->field_index >= report->maxfield)
626 goto inval;
627
628 field = report->field[uref->field_index];
629
630 if (cmd == HIDIOCGCOLLECTIONINDEX) {
631 if (uref->usage_index >= field->maxusage)
632 goto inval;
633 } else if (uref->usage_index >= field->report_count)
634 goto inval;
635
636 else if ((cmd == HIDIOCGUSAGES || cmd == HIDIOCSUSAGES) &&
637 (uref_multi->num_values > HID_MAX_MULTI_USAGES ||
638 uref->usage_index + uref_multi->num_values > field->report_count))
639 goto inval;
640 }
641
642 switch (cmd) {
643 case HIDIOCGUSAGE:
644 uref->value = field->value[uref->usage_index];
645 if (copy_to_user(user_arg, uref, sizeof(*uref)))
646 goto fault;
647 goto goodreturn;
648
649 case HIDIOCSUSAGE:
650 field->value[uref->usage_index] = uref->value;
651 goto goodreturn;
652
653 case HIDIOCGCOLLECTIONINDEX:
654 kfree(uref_multi);
655 return field->usage[uref->usage_index].collection_index;
656 case HIDIOCGUSAGES:
657 for (i = 0; i < uref_multi->num_values; i++)
658 uref_multi->values[i] =
659 field->value[uref->usage_index + i];
660 if (copy_to_user(user_arg, uref_multi,
661 sizeof(*uref_multi)))
662 goto fault;
663 goto goodreturn;
664 case HIDIOCSUSAGES:
665 for (i = 0; i < uref_multi->num_values; i++)
666 field->value[uref->usage_index + i] =
667 uref_multi->values[i];
668 goto goodreturn;
669 }
670
671 goodreturn:
672 kfree(uref_multi);
673 return 0;
674 fault:
675 kfree(uref_multi);
676 return -EFAULT;
677 inval:
678 kfree(uref_multi);
679 return -EINVAL;
680
681 case HIDIOCGCOLLECTIONINFO:
682 if (copy_from_user(&cinfo, user_arg, sizeof(cinfo)))
683 return -EFAULT;
684
685 if (cinfo.index >= hid->maxcollection)
686 return -EINVAL;
687
688 cinfo.type = hid->collection[cinfo.index].type;
689 cinfo.usage = hid->collection[cinfo.index].usage;
690 cinfo.level = hid->collection[cinfo.index].level;
691
692 if (copy_to_user(user_arg, &cinfo, sizeof(cinfo)))
693 return -EFAULT;
694 return 0;
695
696 default:
697
698 if (_IOC_TYPE(cmd) != 'H' || _IOC_DIR(cmd) != _IOC_READ)
699 return -EINVAL;
700
701 if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGNAME(0))) {
702 int len;
703 if (!hid->name)
704 return 0;
705 len = strlen(hid->name) + 1;
706 if (len > _IOC_SIZE(cmd))
707 len = _IOC_SIZE(cmd);
708 return copy_to_user(user_arg, hid->name, len) ?
709 -EFAULT : len;
710 }
711
712 if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGPHYS(0))) {
713 int len;
714 if (!hid->phys)
715 return 0;
716 len = strlen(hid->phys) + 1;
717 if (len > _IOC_SIZE(cmd))
718 len = _IOC_SIZE(cmd);
719 return copy_to_user(user_arg, hid->phys, len) ?
720 -EFAULT : len;
721 }
722 }
723 return -EINVAL;
724 }
725
726 static const struct file_operations hiddev_fops = {
727 .owner = THIS_MODULE,
728 .read = hiddev_read,
729 .write = hiddev_write,
730 .poll = hiddev_poll,
731 .open = hiddev_open,
732 .release = hiddev_release,
733 .ioctl = hiddev_ioctl,
734 .fasync = hiddev_fasync,
735 };
736
737 static struct usb_class_driver hiddev_class = {
738 .name = "hiddev%d",
739 .fops = &hiddev_fops,
740 .minor_base = HIDDEV_MINOR_BASE,
741 };
742
743 /*
744 * This is where hid.c calls us to connect a hid device to the hiddev driver
745 */
746 int hiddev_connect(struct hid_device *hid)
747 {
748 struct hiddev *hiddev;
749 int i;
750 int retval;
751
752 for (i = 0; i < hid->maxcollection; i++)
753 if (hid->collection[i].type ==
754 HID_COLLECTION_APPLICATION &&
755 !IS_INPUT_APPLICATION(hid->collection[i].usage))
756 break;
757
758 if (i == hid->maxcollection && (hid->quirks & HID_QUIRK_HIDDEV) == 0)
759 return -1;
760
761 if (!(hiddev = kzalloc(sizeof(struct hiddev), GFP_KERNEL)))
762 return -1;
763
764 retval = usb_register_dev(hid->intf, &hiddev_class);
765 if (retval) {
766 err("Not able to get a minor for this device.");
767 kfree(hiddev);
768 return -1;
769 }
770
771 init_waitqueue_head(&hiddev->wait);
772 INIT_LIST_HEAD(&hiddev->list);
773 hiddev->hid = hid;
774 hiddev->exist = 1;
775
776 hid->minor = hid->intf->minor;
777 hid->hiddev = hiddev;
778
779 hiddev_table[hid->intf->minor - HIDDEV_MINOR_BASE] = hiddev;
780
781 return 0;
782 }
783
784 /*
785 * This is where hid.c calls us to disconnect a hiddev device from the
786 * corresponding hid device (usually because the usb device has disconnected)
787 */
788 static struct usb_class_driver hiddev_class;
789 void hiddev_disconnect(struct hid_device *hid)
790 {
791 struct hiddev *hiddev = hid->hiddev;
792
793 hiddev->exist = 0;
794
795 hiddev_table[hiddev->hid->minor - HIDDEV_MINOR_BASE] = NULL;
796 usb_deregister_dev(hiddev->hid->intf, &hiddev_class);
797
798 if (hiddev->open) {
799 hid_close(hiddev->hid);
800 wake_up_interruptible(&hiddev->wait);
801 } else {
802 kfree(hiddev);
803 }
804 }
805
806 /* Currently this driver is a USB driver. It's not a conventional one in
807 * the sense that it doesn't probe at the USB level. Instead it waits to
808 * be connected by HID through the hiddev_connect / hiddev_disconnect
809 * routines. The reason to register as a USB device is to gain part of the
810 * minor number space from the USB major.
811 *
812 * In theory, should the HID code be generalized to more than one physical
813 * medium (say, IEEE 1384), this driver will probably need to register its
814 * own major number, and in doing so, no longer need to register with USB.
815 * At that point the probe routine and hiddev_driver struct below will no
816 * longer be useful.
817 */
818
819
820 /* We never attach in this manner, and rely on HID to connect us. This
821 * is why there is no disconnect routine defined in the usb_driver either.
822 */
823 static int hiddev_usbd_probe(struct usb_interface *intf,
824 const struct usb_device_id *hiddev_info)
825 {
826 return -ENODEV;
827 }
828
829
830 static /* const */ struct usb_driver hiddev_driver = {
831 .name = "hiddev",
832 .probe = hiddev_usbd_probe,
833 };
834
835 int __init hiddev_init(void)
836 {
837 return usb_register(&hiddev_driver);
838 }
839
840 void hiddev_exit(void)
841 {
842 usb_deregister(&hiddev_driver);
843 }
Linus' kernel tree