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1da177e4 LT |
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 | ||
1da177e4 LT |
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 "hid.h" | |
36 | #include <linux/hiddev.h> | |
1da177e4 LT |
37 | |
38 | #ifdef CONFIG_USB_DYNAMIC_MINORS | |
39 | #define HIDDEV_MINOR_BASE 0 | |
40 | #define HIDDEV_MINORS 256 | |
41 | #else | |
42 | #define HIDDEV_MINOR_BASE 96 | |
43 | #define HIDDEV_MINORS 16 | |
44 | #endif | |
45 | #define HIDDEV_BUFFER_SIZE 64 | |
46 | ||
47 | struct hiddev { | |
48 | int exist; | |
49 | int open; | |
50 | wait_queue_head_t wait; | |
51 | struct hid_device *hid; | |
52 | struct hiddev_list *list; | |
53 | }; | |
54 | ||
55 | struct hiddev_list { | |
56 | struct hiddev_usage_ref buffer[HIDDEV_BUFFER_SIZE]; | |
57 | int head; | |
58 | int tail; | |
59 | unsigned flags; | |
60 | struct fasync_struct *fasync; | |
61 | struct hiddev *hiddev; | |
62 | struct hiddev_list *next; | |
63 | }; | |
64 | ||
65 | static struct hiddev *hiddev_table[HIDDEV_MINORS]; | |
66 | ||
67 | /* | |
68 | * Find a report, given the report's type and ID. The ID can be specified | |
69 | * indirectly by REPORT_ID_FIRST (which returns the first report of the given | |
70 | * type) or by (REPORT_ID_NEXT | old_id), which returns the next report of the | |
71 | * given type which follows old_id. | |
72 | */ | |
73 | static struct hid_report * | |
74 | hiddev_lookup_report(struct hid_device *hid, struct hiddev_report_info *rinfo) | |
75 | { | |
76 | unsigned flags = rinfo->report_id & ~HID_REPORT_ID_MASK; | |
77 | struct hid_report_enum *report_enum; | |
78 | struct list_head *list; | |
79 | ||
80 | if (rinfo->report_type < HID_REPORT_TYPE_MIN || | |
81 | rinfo->report_type > HID_REPORT_TYPE_MAX) return NULL; | |
82 | ||
83 | report_enum = hid->report_enum + | |
84 | (rinfo->report_type - HID_REPORT_TYPE_MIN); | |
85 | ||
86 | switch (flags) { | |
87 | case 0: /* Nothing to do -- report_id is already set correctly */ | |
88 | break; | |
89 | ||
90 | case HID_REPORT_ID_FIRST: | |
91 | list = report_enum->report_list.next; | |
92 | if (list == &report_enum->report_list) | |
93 | return NULL; | |
94 | rinfo->report_id = ((struct hid_report *) list)->id; | |
95 | break; | |
05f091ab | 96 | |
1da177e4 LT |
97 | case HID_REPORT_ID_NEXT: |
98 | list = (struct list_head *) | |
99 | report_enum->report_id_hash[rinfo->report_id & HID_REPORT_ID_MASK]; | |
100 | if (list == NULL) | |
101 | return NULL; | |
102 | list = list->next; | |
103 | if (list == &report_enum->report_list) | |
104 | return NULL; | |
105 | rinfo->report_id = ((struct hid_report *) list)->id; | |
106 | break; | |
05f091ab | 107 | |
1da177e4 LT |
108 | default: |
109 | return NULL; | |
110 | } | |
111 | ||
112 | return report_enum->report_id_hash[rinfo->report_id]; | |
113 | } | |
114 | ||
115 | /* | |
116 | * Perform an exhaustive search of the report table for a usage, given its | |
117 | * type and usage id. | |
118 | */ | |
119 | static struct hid_field * | |
120 | hiddev_lookup_usage(struct hid_device *hid, struct hiddev_usage_ref *uref) | |
121 | { | |
122 | int i, j; | |
123 | struct hid_report *report; | |
124 | struct hid_report_enum *report_enum; | |
125 | struct hid_field *field; | |
126 | ||
127 | if (uref->report_type < HID_REPORT_TYPE_MIN || | |
128 | uref->report_type > HID_REPORT_TYPE_MAX) return NULL; | |
129 | ||
130 | report_enum = hid->report_enum + | |
131 | (uref->report_type - HID_REPORT_TYPE_MIN); | |
132 | ||
133 | list_for_each_entry(report, &report_enum->report_list, list) | |
134 | for (i = 0; i < report->maxfield; i++) { | |
135 | field = report->field[i]; | |
136 | for (j = 0; j < field->maxusage; j++) { | |
137 | if (field->usage[j].hid == uref->usage_code) { | |
138 | uref->report_id = report->id; | |
139 | uref->field_index = i; | |
140 | uref->usage_index = j; | |
141 | return field; | |
142 | } | |
143 | } | |
144 | } | |
145 | ||
146 | return NULL; | |
147 | } | |
148 | ||
149 | static 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; | |
05f091ab | 159 | list->head = (list->head + 1) & |
1da177e4 LT |
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 | * This is where hid.c calls into hiddev to pass an event that occurred over | |
172 | * the interrupt pipe | |
173 | */ | |
174 | void hiddev_hid_event(struct hid_device *hid, struct hid_field *field, | |
175 | struct hid_usage *usage, __s32 value, struct pt_regs *regs) | |
176 | { | |
177 | unsigned type = field->report_type; | |
178 | struct hiddev_usage_ref uref; | |
179 | ||
05f091ab | 180 | uref.report_type = |
1da177e4 | 181 | (type == HID_INPUT_REPORT) ? HID_REPORT_TYPE_INPUT : |
05f091ab | 182 | ((type == HID_OUTPUT_REPORT) ? HID_REPORT_TYPE_OUTPUT : |
1da177e4 LT |
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 | ||
194 | void 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)); | |
05f091ab | 200 | uref.report_type = |
1da177e4 | 201 | (type == HID_INPUT_REPORT) ? HID_REPORT_TYPE_INPUT : |
05f091ab | 202 | ((type == HID_OUTPUT_REPORT) ? HID_REPORT_TYPE_OUTPUT : |
1da177e4 LT |
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 | * fasync file op | |
211 | */ | |
212 | static int hiddev_fasync(int fd, struct file *file, int on) | |
213 | { | |
214 | int retval; | |
215 | struct hiddev_list *list = file->private_data; | |
216 | retval = fasync_helper(fd, file, on, &list->fasync); | |
217 | return retval < 0 ? retval : 0; | |
218 | } | |
219 | ||
220 | ||
221 | /* | |
222 | * release file op | |
223 | */ | |
224 | static int hiddev_release(struct inode * inode, struct file * file) | |
225 | { | |
226 | struct hiddev_list *list = file->private_data; | |
227 | struct hiddev_list **listptr; | |
228 | ||
229 | listptr = &list->hiddev->list; | |
230 | hiddev_fasync(-1, file, 0); | |
231 | ||
232 | while (*listptr && (*listptr != list)) | |
233 | listptr = &((*listptr)->next); | |
234 | *listptr = (*listptr)->next; | |
235 | ||
236 | if (!--list->hiddev->open) { | |
05f091ab | 237 | if (list->hiddev->exist) |
1da177e4 LT |
238 | hid_close(list->hiddev->hid); |
239 | else | |
240 | kfree(list->hiddev); | |
241 | } | |
242 | ||
243 | kfree(list); | |
244 | ||
245 | return 0; | |
246 | } | |
247 | ||
248 | /* | |
249 | * open file op | |
250 | */ | |
251 | static int hiddev_open(struct inode * inode, struct file * file) { | |
252 | struct hiddev_list *list; | |
253 | ||
254 | int i = iminor(inode) - HIDDEV_MINOR_BASE; | |
255 | ||
256 | if (i >= HIDDEV_MINORS || !hiddev_table[i]) | |
257 | return -ENODEV; | |
258 | ||
bbdb7daf | 259 | if (!(list = kzalloc(sizeof(struct hiddev_list), GFP_KERNEL))) |
1da177e4 | 260 | return -ENOMEM; |
1da177e4 LT |
261 | |
262 | list->hiddev = hiddev_table[i]; | |
263 | list->next = hiddev_table[i]->list; | |
264 | hiddev_table[i]->list = list; | |
265 | ||
266 | file->private_data = list; | |
267 | ||
268 | if (!list->hiddev->open++) | |
269 | if (list->hiddev->exist) | |
270 | hid_open(hiddev_table[i]->hid); | |
271 | ||
272 | return 0; | |
273 | } | |
274 | ||
275 | /* | |
276 | * "write" file op | |
277 | */ | |
278 | static ssize_t hiddev_write(struct file * file, const char __user * buffer, size_t count, loff_t *ppos) | |
279 | { | |
280 | return -EINVAL; | |
281 | } | |
282 | ||
283 | /* | |
284 | * "read" file op | |
285 | */ | |
286 | static ssize_t hiddev_read(struct file * file, char __user * buffer, size_t count, loff_t *ppos) | |
287 | { | |
288 | DECLARE_WAITQUEUE(wait, current); | |
289 | struct hiddev_list *list = file->private_data; | |
290 | int event_size; | |
291 | int retval = 0; | |
292 | ||
293 | event_size = ((list->flags & HIDDEV_FLAG_UREF) != 0) ? | |
294 | sizeof(struct hiddev_usage_ref) : sizeof(struct hiddev_event); | |
295 | ||
296 | if (count < event_size) | |
297 | return 0; | |
298 | ||
299 | while (retval == 0) { | |
300 | if (list->head == list->tail) { | |
301 | add_wait_queue(&list->hiddev->wait, &wait); | |
302 | set_current_state(TASK_INTERRUPTIBLE); | |
05f091ab | 303 | |
1da177e4 LT |
304 | while (list->head == list->tail) { |
305 | if (file->f_flags & O_NONBLOCK) { | |
306 | retval = -EAGAIN; | |
307 | break; | |
308 | } | |
309 | if (signal_pending(current)) { | |
310 | retval = -ERESTARTSYS; | |
311 | break; | |
312 | } | |
313 | if (!list->hiddev->exist) { | |
314 | retval = -EIO; | |
315 | break; | |
316 | } | |
05f091ab | 317 | |
1da177e4 | 318 | schedule(); |
48d70552 | 319 | set_current_state(TASK_INTERRUPTIBLE); |
1da177e4 LT |
320 | } |
321 | ||
322 | set_current_state(TASK_RUNNING); | |
323 | remove_wait_queue(&list->hiddev->wait, &wait); | |
324 | } | |
325 | ||
326 | if (retval) | |
327 | return retval; | |
328 | ||
329 | ||
05f091ab | 330 | while (list->head != list->tail && |
1da177e4 LT |
331 | retval + event_size <= count) { |
332 | if ((list->flags & HIDDEV_FLAG_UREF) == 0) { | |
333 | if (list->buffer[list->tail].field_index != | |
334 | HID_FIELD_INDEX_NONE) { | |
335 | struct hiddev_event event; | |
336 | event.hid = list->buffer[list->tail].usage_code; | |
337 | event.value = list->buffer[list->tail].value; | |
338 | if (copy_to_user(buffer + retval, &event, sizeof(struct hiddev_event))) | |
339 | return -EFAULT; | |
340 | retval += sizeof(struct hiddev_event); | |
341 | } | |
342 | } else { | |
343 | if (list->buffer[list->tail].field_index != HID_FIELD_INDEX_NONE || | |
344 | (list->flags & HIDDEV_FLAG_REPORT) != 0) { | |
345 | if (copy_to_user(buffer + retval, list->buffer + list->tail, sizeof(struct hiddev_usage_ref))) | |
346 | return -EFAULT; | |
347 | retval += sizeof(struct hiddev_usage_ref); | |
348 | } | |
349 | } | |
350 | list->tail = (list->tail + 1) & (HIDDEV_BUFFER_SIZE - 1); | |
351 | } | |
352 | ||
353 | } | |
354 | ||
355 | return retval; | |
356 | } | |
357 | ||
358 | /* | |
359 | * "poll" file op | |
360 | * No kernel lock - fine | |
361 | */ | |
362 | static unsigned int hiddev_poll(struct file *file, poll_table *wait) | |
363 | { | |
364 | struct hiddev_list *list = file->private_data; | |
365 | poll_wait(file, &list->hiddev->wait, wait); | |
366 | if (list->head != list->tail) | |
367 | return POLLIN | POLLRDNORM; | |
368 | if (!list->hiddev->exist) | |
369 | return POLLERR | POLLHUP; | |
370 | return 0; | |
371 | } | |
372 | ||
373 | /* | |
374 | * "ioctl" file op | |
375 | */ | |
376 | static int hiddev_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) | |
377 | { | |
378 | struct hiddev_list *list = file->private_data; | |
379 | struct hiddev *hiddev = list->hiddev; | |
380 | struct hid_device *hid = hiddev->hid; | |
381 | struct usb_device *dev = hid->dev; | |
382 | struct hiddev_collection_info cinfo; | |
383 | struct hiddev_report_info rinfo; | |
384 | struct hiddev_field_info finfo; | |
385 | struct hiddev_usage_ref_multi *uref_multi=NULL; | |
386 | struct hiddev_usage_ref *uref; | |
387 | struct hiddev_devinfo dinfo; | |
388 | struct hid_report *report; | |
389 | struct hid_field *field; | |
390 | void __user *user_arg = (void __user *)arg; | |
391 | int i; | |
392 | ||
393 | if (!hiddev->exist) | |
394 | return -EIO; | |
395 | ||
396 | switch (cmd) { | |
397 | ||
398 | case HIDIOCGVERSION: | |
399 | return put_user(HID_VERSION, (int __user *)arg); | |
400 | ||
401 | case HIDIOCAPPLICATION: | |
402 | if (arg < 0 || arg >= hid->maxapplication) | |
403 | return -EINVAL; | |
404 | ||
405 | for (i = 0; i < hid->maxcollection; i++) | |
05f091ab | 406 | if (hid->collection[i].type == |
1da177e4 LT |
407 | HID_COLLECTION_APPLICATION && arg-- == 0) |
408 | break; | |
05f091ab | 409 | |
1da177e4 LT |
410 | if (i == hid->maxcollection) |
411 | return -EINVAL; | |
412 | ||
413 | return hid->collection[i].usage; | |
414 | ||
415 | case HIDIOCGDEVINFO: | |
416 | dinfo.bustype = BUS_USB; | |
417 | dinfo.busnum = dev->bus->busnum; | |
418 | dinfo.devnum = dev->devnum; | |
419 | dinfo.ifnum = hid->ifnum; | |
420 | dinfo.vendor = le16_to_cpu(dev->descriptor.idVendor); | |
421 | dinfo.product = le16_to_cpu(dev->descriptor.idProduct); | |
422 | dinfo.version = le16_to_cpu(dev->descriptor.bcdDevice); | |
423 | dinfo.num_applications = hid->maxapplication; | |
424 | if (copy_to_user(user_arg, &dinfo, sizeof(dinfo))) | |
425 | return -EFAULT; | |
426 | ||
427 | return 0; | |
428 | ||
429 | case HIDIOCGFLAG: | |
430 | if (put_user(list->flags, (int __user *)arg)) | |
431 | return -EFAULT; | |
432 | ||
433 | return 0; | |
434 | ||
435 | case HIDIOCSFLAG: | |
436 | { | |
437 | int newflags; | |
438 | if (get_user(newflags, (int __user *)arg)) | |
439 | return -EFAULT; | |
440 | ||
441 | if ((newflags & ~HIDDEV_FLAGS) != 0 || | |
442 | ((newflags & HIDDEV_FLAG_REPORT) != 0 && | |
443 | (newflags & HIDDEV_FLAG_UREF) == 0)) | |
444 | return -EINVAL; | |
445 | ||
446 | list->flags = newflags; | |
447 | ||
448 | return 0; | |
449 | } | |
450 | ||
451 | case HIDIOCGSTRING: | |
452 | { | |
453 | int idx, len; | |
454 | char *buf; | |
455 | ||
456 | if (get_user(idx, (int __user *)arg)) | |
457 | return -EFAULT; | |
458 | ||
459 | if ((buf = kmalloc(HID_STRING_SIZE, GFP_KERNEL)) == NULL) | |
460 | return -ENOMEM; | |
461 | ||
462 | if ((len = usb_string(dev, idx, buf, HID_STRING_SIZE-1)) < 0) { | |
463 | kfree(buf); | |
464 | return -EINVAL; | |
465 | } | |
466 | ||
467 | if (copy_to_user(user_arg+sizeof(int), buf, len+1)) { | |
468 | kfree(buf); | |
469 | return -EFAULT; | |
470 | } | |
471 | ||
472 | kfree(buf); | |
473 | ||
474 | return len; | |
475 | } | |
476 | ||
477 | case HIDIOCINITREPORT: | |
478 | hid_init_reports(hid); | |
479 | ||
480 | return 0; | |
481 | ||
482 | case HIDIOCGREPORT: | |
483 | if (copy_from_user(&rinfo, user_arg, sizeof(rinfo))) | |
484 | return -EFAULT; | |
485 | ||
486 | if (rinfo.report_type == HID_REPORT_TYPE_OUTPUT) | |
487 | return -EINVAL; | |
488 | ||
489 | if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL) | |
490 | return -EINVAL; | |
491 | ||
492 | hid_submit_report(hid, report, USB_DIR_IN); | |
493 | hid_wait_io(hid); | |
494 | ||
495 | return 0; | |
496 | ||
497 | case HIDIOCSREPORT: | |
498 | if (copy_from_user(&rinfo, user_arg, sizeof(rinfo))) | |
499 | return -EFAULT; | |
500 | ||
501 | if (rinfo.report_type == HID_REPORT_TYPE_INPUT) | |
502 | return -EINVAL; | |
503 | ||
504 | if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL) | |
505 | return -EINVAL; | |
506 | ||
507 | hid_submit_report(hid, report, USB_DIR_OUT); | |
010988e8 | 508 | hid_wait_io(hid); |
1da177e4 LT |
509 | |
510 | return 0; | |
511 | ||
512 | case HIDIOCGREPORTINFO: | |
513 | if (copy_from_user(&rinfo, user_arg, sizeof(rinfo))) | |
514 | return -EFAULT; | |
515 | ||
516 | if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL) | |
517 | return -EINVAL; | |
518 | ||
519 | rinfo.num_fields = report->maxfield; | |
520 | ||
521 | if (copy_to_user(user_arg, &rinfo, sizeof(rinfo))) | |
522 | return -EFAULT; | |
523 | ||
524 | return 0; | |
525 | ||
526 | case HIDIOCGFIELDINFO: | |
527 | if (copy_from_user(&finfo, user_arg, sizeof(finfo))) | |
528 | return -EFAULT; | |
529 | rinfo.report_type = finfo.report_type; | |
530 | rinfo.report_id = finfo.report_id; | |
531 | if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL) | |
532 | return -EINVAL; | |
533 | ||
534 | if (finfo.field_index >= report->maxfield) | |
535 | return -EINVAL; | |
536 | ||
537 | field = report->field[finfo.field_index]; | |
538 | memset(&finfo, 0, sizeof(finfo)); | |
539 | finfo.report_type = rinfo.report_type; | |
540 | finfo.report_id = rinfo.report_id; | |
541 | finfo.field_index = field->report_count - 1; | |
542 | finfo.maxusage = field->maxusage; | |
543 | finfo.flags = field->flags; | |
544 | finfo.physical = field->physical; | |
545 | finfo.logical = field->logical; | |
546 | finfo.application = field->application; | |
547 | finfo.logical_minimum = field->logical_minimum; | |
548 | finfo.logical_maximum = field->logical_maximum; | |
549 | finfo.physical_minimum = field->physical_minimum; | |
550 | finfo.physical_maximum = field->physical_maximum; | |
551 | finfo.unit_exponent = field->unit_exponent; | |
552 | finfo.unit = field->unit; | |
553 | ||
554 | if (copy_to_user(user_arg, &finfo, sizeof(finfo))) | |
555 | return -EFAULT; | |
556 | ||
557 | return 0; | |
558 | ||
559 | case HIDIOCGUCODE: | |
560 | uref_multi = kmalloc(sizeof(struct hiddev_usage_ref_multi), GFP_KERNEL); | |
561 | if (!uref_multi) | |
562 | return -ENOMEM; | |
563 | uref = &uref_multi->uref; | |
05f091ab | 564 | if (copy_from_user(uref, user_arg, sizeof(*uref))) |
1da177e4 LT |
565 | goto fault; |
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 | goto inval; | |
571 | ||
572 | if (uref->field_index >= report->maxfield) | |
573 | goto inval; | |
574 | ||
575 | field = report->field[uref->field_index]; | |
576 | if (uref->usage_index >= field->maxusage) | |
577 | goto inval; | |
578 | ||
579 | uref->usage_code = field->usage[uref->usage_index].hid; | |
580 | ||
581 | if (copy_to_user(user_arg, uref, sizeof(*uref))) | |
582 | goto fault; | |
583 | ||
584 | kfree(uref_multi); | |
585 | return 0; | |
586 | ||
587 | case HIDIOCGUSAGE: | |
588 | case HIDIOCSUSAGE: | |
589 | case HIDIOCGUSAGES: | |
590 | case HIDIOCSUSAGES: | |
591 | case HIDIOCGCOLLECTIONINDEX: | |
592 | uref_multi = kmalloc(sizeof(struct hiddev_usage_ref_multi), GFP_KERNEL); | |
593 | if (!uref_multi) | |
594 | return -ENOMEM; | |
595 | uref = &uref_multi->uref; | |
596 | if (cmd == HIDIOCGUSAGES || cmd == HIDIOCSUSAGES) { | |
05f091ab | 597 | if (copy_from_user(uref_multi, user_arg, |
1da177e4 LT |
598 | sizeof(*uref_multi))) |
599 | goto fault; | |
600 | } else { | |
601 | if (copy_from_user(uref, user_arg, sizeof(*uref))) | |
602 | goto fault; | |
603 | } | |
604 | ||
05f091ab | 605 | if (cmd != HIDIOCGUSAGE && |
1da177e4 LT |
606 | cmd != HIDIOCGUSAGES && |
607 | uref->report_type == HID_REPORT_TYPE_INPUT) | |
608 | goto inval; | |
609 | ||
610 | if (uref->report_id == HID_REPORT_ID_UNKNOWN) { | |
611 | field = hiddev_lookup_usage(hid, uref); | |
612 | if (field == NULL) | |
613 | goto inval; | |
614 | } else { | |
615 | rinfo.report_type = uref->report_type; | |
616 | rinfo.report_id = uref->report_id; | |
617 | if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL) | |
618 | goto inval; | |
619 | ||
620 | if (uref->field_index >= report->maxfield) | |
621 | goto inval; | |
622 | ||
623 | field = report->field[uref->field_index]; | |
624 | ||
625 | if (cmd == HIDIOCGCOLLECTIONINDEX) { | |
626 | if (uref->usage_index >= field->maxusage) | |
627 | goto inval; | |
628 | } else if (uref->usage_index >= field->report_count) | |
629 | goto inval; | |
630 | ||
631 | else if ((cmd == HIDIOCGUSAGES || cmd == HIDIOCSUSAGES) && | |
632 | (uref_multi->num_values > HID_MAX_MULTI_USAGES || | |
6dea9347 | 633 | uref->usage_index + uref_multi->num_values > field->report_count)) |
1da177e4 LT |
634 | goto inval; |
635 | } | |
636 | ||
637 | switch (cmd) { | |
638 | case HIDIOCGUSAGE: | |
639 | uref->value = field->value[uref->usage_index]; | |
640 | if (copy_to_user(user_arg, uref, sizeof(*uref))) | |
641 | goto fault; | |
642 | goto goodreturn; | |
643 | ||
644 | case HIDIOCSUSAGE: | |
645 | field->value[uref->usage_index] = uref->value; | |
646 | goto goodreturn; | |
647 | ||
648 | case HIDIOCGCOLLECTIONINDEX: | |
649 | kfree(uref_multi); | |
650 | return field->usage[uref->usage_index].collection_index; | |
651 | case HIDIOCGUSAGES: | |
652 | for (i = 0; i < uref_multi->num_values; i++) | |
05f091ab | 653 | uref_multi->values[i] = |
1da177e4 | 654 | field->value[uref->usage_index + i]; |
05f091ab | 655 | if (copy_to_user(user_arg, uref_multi, |
1da177e4 LT |
656 | sizeof(*uref_multi))) |
657 | goto fault; | |
658 | goto goodreturn; | |
659 | case HIDIOCSUSAGES: | |
660 | for (i = 0; i < uref_multi->num_values; i++) | |
05f091ab DT |
661 | field->value[uref->usage_index + i] = |
662 | uref_multi->values[i]; | |
1da177e4 LT |
663 | goto goodreturn; |
664 | } | |
665 | ||
666 | goodreturn: | |
667 | kfree(uref_multi); | |
668 | return 0; | |
669 | fault: | |
670 | kfree(uref_multi); | |
671 | return -EFAULT; | |
05f091ab | 672 | inval: |
1da177e4 LT |
673 | kfree(uref_multi); |
674 | return -EINVAL; | |
675 | ||
676 | case HIDIOCGCOLLECTIONINFO: | |
677 | if (copy_from_user(&cinfo, user_arg, sizeof(cinfo))) | |
678 | return -EFAULT; | |
679 | ||
680 | if (cinfo.index >= hid->maxcollection) | |
681 | return -EINVAL; | |
682 | ||
683 | cinfo.type = hid->collection[cinfo.index].type; | |
684 | cinfo.usage = hid->collection[cinfo.index].usage; | |
685 | cinfo.level = hid->collection[cinfo.index].level; | |
686 | ||
687 | if (copy_to_user(user_arg, &cinfo, sizeof(cinfo))) | |
688 | return -EFAULT; | |
689 | return 0; | |
690 | ||
691 | default: | |
692 | ||
693 | if (_IOC_TYPE(cmd) != 'H' || _IOC_DIR(cmd) != _IOC_READ) | |
694 | return -EINVAL; | |
695 | ||
696 | if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGNAME(0))) { | |
697 | int len; | |
698 | if (!hid->name) | |
699 | return 0; | |
700 | len = strlen(hid->name) + 1; | |
701 | if (len > _IOC_SIZE(cmd)) | |
702 | len = _IOC_SIZE(cmd); | |
703 | return copy_to_user(user_arg, hid->name, len) ? | |
704 | -EFAULT : len; | |
705 | } | |
706 | ||
707 | if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGPHYS(0))) { | |
708 | int len; | |
709 | if (!hid->phys) | |
710 | return 0; | |
711 | len = strlen(hid->phys) + 1; | |
712 | if (len > _IOC_SIZE(cmd)) | |
713 | len = _IOC_SIZE(cmd); | |
714 | return copy_to_user(user_arg, hid->phys, len) ? | |
715 | -EFAULT : len; | |
716 | } | |
717 | } | |
718 | return -EINVAL; | |
719 | } | |
720 | ||
721 | static struct file_operations hiddev_fops = { | |
722 | .owner = THIS_MODULE, | |
723 | .read = hiddev_read, | |
724 | .write = hiddev_write, | |
725 | .poll = hiddev_poll, | |
726 | .open = hiddev_open, | |
727 | .release = hiddev_release, | |
728 | .ioctl = hiddev_ioctl, | |
729 | .fasync = hiddev_fasync, | |
730 | }; | |
731 | ||
732 | static struct usb_class_driver hiddev_class = { | |
d6e5bcf4 | 733 | .name = "hiddev%d", |
1da177e4 | 734 | .fops = &hiddev_fops, |
05f091ab | 735 | .minor_base = HIDDEV_MINOR_BASE, |
1da177e4 LT |
736 | }; |
737 | ||
738 | /* | |
739 | * This is where hid.c calls us to connect a hid device to the hiddev driver | |
740 | */ | |
741 | int hiddev_connect(struct hid_device *hid) | |
742 | { | |
743 | struct hiddev *hiddev; | |
744 | int i; | |
745 | int retval; | |
746 | ||
747 | for (i = 0; i < hid->maxcollection; i++) | |
05f091ab | 748 | if (hid->collection[i].type == |
1da177e4 LT |
749 | HID_COLLECTION_APPLICATION && |
750 | !IS_INPUT_APPLICATION(hid->collection[i].usage)) | |
751 | break; | |
752 | ||
753 | if (i == hid->maxcollection && (hid->quirks & HID_QUIRK_HIDDEV) == 0) | |
754 | return -1; | |
755 | ||
bbdb7daf | 756 | if (!(hiddev = kzalloc(sizeof(struct hiddev), GFP_KERNEL))) |
1da177e4 | 757 | return -1; |
1da177e4 | 758 | |
05f091ab | 759 | retval = usb_register_dev(hid->intf, &hiddev_class); |
1da177e4 LT |
760 | if (retval) { |
761 | err("Not able to get a minor for this device."); | |
762 | kfree(hiddev); | |
763 | return -1; | |
764 | } | |
765 | ||
766 | init_waitqueue_head(&hiddev->wait); | |
767 | ||
05f091ab | 768 | hiddev_table[hid->intf->minor - HIDDEV_MINOR_BASE] = hiddev; |
1da177e4 LT |
769 | |
770 | hiddev->hid = hid; | |
771 | hiddev->exist = 1; | |
772 | ||
05f091ab | 773 | hid->minor = hid->intf->minor; |
1da177e4 LT |
774 | hid->hiddev = hiddev; |
775 | ||
776 | return 0; | |
777 | } | |
778 | ||
779 | /* | |
780 | * This is where hid.c calls us to disconnect a hiddev device from the | |
781 | * corresponding hid device (usually because the usb device has disconnected) | |
782 | */ | |
783 | static struct usb_class_driver hiddev_class; | |
784 | void hiddev_disconnect(struct hid_device *hid) | |
785 | { | |
786 | struct hiddev *hiddev = hid->hiddev; | |
787 | ||
788 | hiddev->exist = 0; | |
789 | ||
790 | hiddev_table[hiddev->hid->minor - HIDDEV_MINOR_BASE] = NULL; | |
791 | usb_deregister_dev(hiddev->hid->intf, &hiddev_class); | |
792 | ||
793 | if (hiddev->open) { | |
794 | hid_close(hiddev->hid); | |
795 | wake_up_interruptible(&hiddev->wait); | |
796 | } else { | |
797 | kfree(hiddev); | |
798 | } | |
799 | } | |
800 | ||
801 | /* Currently this driver is a USB driver. It's not a conventional one in | |
802 | * the sense that it doesn't probe at the USB level. Instead it waits to | |
803 | * be connected by HID through the hiddev_connect / hiddev_disconnect | |
804 | * routines. The reason to register as a USB device is to gain part of the | |
805 | * minor number space from the USB major. | |
806 | * | |
807 | * In theory, should the HID code be generalized to more than one physical | |
808 | * medium (say, IEEE 1384), this driver will probably need to register its | |
809 | * own major number, and in doing so, no longer need to register with USB. | |
810 | * At that point the probe routine and hiddev_driver struct below will no | |
811 | * longer be useful. | |
812 | */ | |
813 | ||
814 | ||
815 | /* We never attach in this manner, and rely on HID to connect us. This | |
816 | * is why there is no disconnect routine defined in the usb_driver either. | |
817 | */ | |
05f091ab | 818 | static int hiddev_usbd_probe(struct usb_interface *intf, |
1da177e4 LT |
819 | const struct usb_device_id *hiddev_info) |
820 | { | |
821 | return -ENODEV; | |
822 | } | |
823 | ||
824 | ||
825 | static /* const */ struct usb_driver hiddev_driver = { | |
1da177e4 LT |
826 | .name = "hiddev", |
827 | .probe = hiddev_usbd_probe, | |
828 | }; | |
829 | ||
830 | int __init hiddev_init(void) | |
831 | { | |
1da177e4 LT |
832 | return usb_register(&hiddev_driver); |
833 | } | |
834 | ||
835 | void hiddev_exit(void) | |
836 | { | |
837 | usb_deregister(&hiddev_driver); | |
1da177e4 | 838 | } |