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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; | |
826d5982 | 52 | struct list_head list; |
1da177e4 LT |
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; | |
826d5982 | 62 | struct list_head node; |
1da177e4 LT |
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 | { | |
826d5982 DT |
76 | unsigned int flags = rinfo->report_id & ~HID_REPORT_ID_MASK; |
77 | unsigned int rid = rinfo->report_id & HID_REPORT_ID_MASK; | |
1da177e4 | 78 | struct hid_report_enum *report_enum; |
826d5982 | 79 | struct hid_report *report; |
1da177e4 LT |
80 | struct list_head *list; |
81 | ||
82 | if (rinfo->report_type < HID_REPORT_TYPE_MIN || | |
826d5982 DT |
83 | rinfo->report_type > HID_REPORT_TYPE_MAX) |
84 | return NULL; | |
1da177e4 LT |
85 | |
86 | report_enum = hid->report_enum + | |
87 | (rinfo->report_type - HID_REPORT_TYPE_MIN); | |
88 | ||
89 | switch (flags) { | |
90 | case 0: /* Nothing to do -- report_id is already set correctly */ | |
91 | break; | |
92 | ||
93 | case HID_REPORT_ID_FIRST: | |
826d5982 | 94 | if (list_empty(&report_enum->report_list)) |
1da177e4 | 95 | return NULL; |
826d5982 DT |
96 | |
97 | list = report_enum->report_list.next; | |
98 | report = list_entry(list, struct hid_report, list); | |
99 | rinfo->report_id = report->id; | |
1da177e4 | 100 | break; |
05f091ab | 101 | |
1da177e4 | 102 | case HID_REPORT_ID_NEXT: |
826d5982 DT |
103 | report = report_enum->report_id_hash[rid]; |
104 | if (!report) | |
1da177e4 | 105 | return NULL; |
826d5982 DT |
106 | |
107 | list = report->list.next; | |
1da177e4 LT |
108 | if (list == &report_enum->report_list) |
109 | return NULL; | |
826d5982 DT |
110 | |
111 | report = list_entry(list, struct hid_report, list); | |
112 | rinfo->report_id = report->id; | |
1da177e4 | 113 | break; |
05f091ab | 114 | |
1da177e4 LT |
115 | default: |
116 | return NULL; | |
117 | } | |
118 | ||
119 | return report_enum->report_id_hash[rinfo->report_id]; | |
120 | } | |
121 | ||
122 | /* | |
123 | * Perform an exhaustive search of the report table for a usage, given its | |
124 | * type and usage id. | |
125 | */ | |
126 | static struct hid_field * | |
127 | hiddev_lookup_usage(struct hid_device *hid, struct hiddev_usage_ref *uref) | |
128 | { | |
129 | int i, j; | |
130 | struct hid_report *report; | |
131 | struct hid_report_enum *report_enum; | |
132 | struct hid_field *field; | |
133 | ||
134 | if (uref->report_type < HID_REPORT_TYPE_MIN || | |
826d5982 DT |
135 | uref->report_type > HID_REPORT_TYPE_MAX) |
136 | return NULL; | |
1da177e4 LT |
137 | |
138 | report_enum = hid->report_enum + | |
139 | (uref->report_type - HID_REPORT_TYPE_MIN); | |
140 | ||
826d5982 | 141 | list_for_each_entry(report, &report_enum->report_list, list) { |
1da177e4 LT |
142 | for (i = 0; i < report->maxfield; i++) { |
143 | field = report->field[i]; | |
144 | for (j = 0; j < field->maxusage; j++) { | |
145 | if (field->usage[j].hid == uref->usage_code) { | |
146 | uref->report_id = report->id; | |
147 | uref->field_index = i; | |
148 | uref->usage_index = j; | |
149 | return field; | |
150 | } | |
151 | } | |
152 | } | |
826d5982 | 153 | } |
1da177e4 LT |
154 | |
155 | return NULL; | |
156 | } | |
157 | ||
158 | static void hiddev_send_event(struct hid_device *hid, | |
159 | struct hiddev_usage_ref *uref) | |
160 | { | |
161 | struct hiddev *hiddev = hid->hiddev; | |
826d5982 | 162 | struct hiddev_list *list; |
1da177e4 | 163 | |
826d5982 | 164 | list_for_each_entry(list, &hiddev->list, node) { |
1da177e4 LT |
165 | if (uref->field_index != HID_FIELD_INDEX_NONE || |
166 | (list->flags & HIDDEV_FLAG_REPORT) != 0) { | |
167 | list->buffer[list->head] = *uref; | |
05f091ab | 168 | list->head = (list->head + 1) & |
1da177e4 LT |
169 | (HIDDEV_BUFFER_SIZE - 1); |
170 | kill_fasync(&list->fasync, SIGIO, POLL_IN); | |
171 | } | |
1da177e4 LT |
172 | } |
173 | ||
174 | wake_up_interruptible(&hiddev->wait); | |
175 | } | |
176 | ||
177 | /* | |
178 | * This is where hid.c calls into hiddev to pass an event that occurred over | |
179 | * the interrupt pipe | |
180 | */ | |
181 | void hiddev_hid_event(struct hid_device *hid, struct hid_field *field, | |
7d12e780 | 182 | struct hid_usage *usage, __s32 value) |
1da177e4 LT |
183 | { |
184 | unsigned type = field->report_type; | |
185 | struct hiddev_usage_ref uref; | |
186 | ||
05f091ab | 187 | uref.report_type = |
1da177e4 | 188 | (type == HID_INPUT_REPORT) ? HID_REPORT_TYPE_INPUT : |
05f091ab | 189 | ((type == HID_OUTPUT_REPORT) ? HID_REPORT_TYPE_OUTPUT : |
826d5982 | 190 | ((type == HID_FEATURE_REPORT) ? HID_REPORT_TYPE_FEATURE : 0)); |
1da177e4 LT |
191 | uref.report_id = field->report->id; |
192 | uref.field_index = field->index; | |
193 | uref.usage_index = (usage - field->usage); | |
194 | uref.usage_code = usage->hid; | |
195 | uref.value = value; | |
196 | ||
197 | hiddev_send_event(hid, &uref); | |
198 | } | |
199 | ||
200 | ||
201 | void hiddev_report_event(struct hid_device *hid, struct hid_report *report) | |
202 | { | |
203 | unsigned type = report->type; | |
204 | struct hiddev_usage_ref uref; | |
205 | ||
206 | memset(&uref, 0, sizeof(uref)); | |
05f091ab | 207 | uref.report_type = |
1da177e4 | 208 | (type == HID_INPUT_REPORT) ? HID_REPORT_TYPE_INPUT : |
05f091ab | 209 | ((type == HID_OUTPUT_REPORT) ? HID_REPORT_TYPE_OUTPUT : |
826d5982 | 210 | ((type == HID_FEATURE_REPORT) ? HID_REPORT_TYPE_FEATURE : 0)); |
1da177e4 LT |
211 | uref.report_id = report->id; |
212 | uref.field_index = HID_FIELD_INDEX_NONE; | |
213 | ||
214 | hiddev_send_event(hid, &uref); | |
215 | } | |
216 | /* | |
217 | * fasync file op | |
218 | */ | |
219 | static int hiddev_fasync(int fd, struct file *file, int on) | |
220 | { | |
221 | int retval; | |
222 | struct hiddev_list *list = file->private_data; | |
826d5982 | 223 | |
1da177e4 | 224 | retval = fasync_helper(fd, file, on, &list->fasync); |
826d5982 | 225 | |
1da177e4 LT |
226 | return retval < 0 ? retval : 0; |
227 | } | |
228 | ||
229 | ||
230 | /* | |
231 | * release file op | |
232 | */ | |
233 | static int hiddev_release(struct inode * inode, struct file * file) | |
234 | { | |
235 | struct hiddev_list *list = file->private_data; | |
1da177e4 | 236 | |
1da177e4 | 237 | hiddev_fasync(-1, file, 0); |
826d5982 | 238 | list_del(&list->node); |
1da177e4 LT |
239 | |
240 | if (!--list->hiddev->open) { | |
05f091ab | 241 | if (list->hiddev->exist) |
1da177e4 LT |
242 | hid_close(list->hiddev->hid); |
243 | else | |
244 | kfree(list->hiddev); | |
245 | } | |
246 | ||
247 | kfree(list); | |
248 | ||
249 | return 0; | |
250 | } | |
251 | ||
252 | /* | |
253 | * open file op | |
254 | */ | |
826d5982 DT |
255 | static int hiddev_open(struct inode *inode, struct file *file) |
256 | { | |
1da177e4 LT |
257 | struct hiddev_list *list; |
258 | ||
259 | int i = iminor(inode) - HIDDEV_MINOR_BASE; | |
260 | ||
261 | if (i >= HIDDEV_MINORS || !hiddev_table[i]) | |
262 | return -ENODEV; | |
263 | ||
bbdb7daf | 264 | if (!(list = kzalloc(sizeof(struct hiddev_list), GFP_KERNEL))) |
1da177e4 | 265 | return -ENOMEM; |
1da177e4 LT |
266 | |
267 | list->hiddev = hiddev_table[i]; | |
826d5982 | 268 | list_add_tail(&list->node, &hiddev_table[i]->list); |
1da177e4 LT |
269 | file->private_data = list; |
270 | ||
271 | if (!list->hiddev->open++) | |
272 | if (list->hiddev->exist) | |
273 | hid_open(hiddev_table[i]->hid); | |
274 | ||
275 | return 0; | |
276 | } | |
277 | ||
278 | /* | |
279 | * "write" file op | |
280 | */ | |
281 | static ssize_t hiddev_write(struct file * file, const char __user * buffer, size_t count, loff_t *ppos) | |
282 | { | |
283 | return -EINVAL; | |
284 | } | |
285 | ||
286 | /* | |
287 | * "read" file op | |
288 | */ | |
289 | static ssize_t hiddev_read(struct file * file, char __user * buffer, size_t count, loff_t *ppos) | |
290 | { | |
291 | DECLARE_WAITQUEUE(wait, current); | |
292 | struct hiddev_list *list = file->private_data; | |
293 | int event_size; | |
294 | int retval = 0; | |
295 | ||
296 | event_size = ((list->flags & HIDDEV_FLAG_UREF) != 0) ? | |
297 | sizeof(struct hiddev_usage_ref) : sizeof(struct hiddev_event); | |
298 | ||
299 | if (count < event_size) | |
300 | return 0; | |
301 | ||
302 | while (retval == 0) { | |
303 | if (list->head == list->tail) { | |
304 | add_wait_queue(&list->hiddev->wait, &wait); | |
305 | set_current_state(TASK_INTERRUPTIBLE); | |
05f091ab | 306 | |
1da177e4 LT |
307 | while (list->head == list->tail) { |
308 | if (file->f_flags & O_NONBLOCK) { | |
309 | retval = -EAGAIN; | |
310 | break; | |
311 | } | |
312 | if (signal_pending(current)) { | |
313 | retval = -ERESTARTSYS; | |
314 | break; | |
315 | } | |
316 | if (!list->hiddev->exist) { | |
317 | retval = -EIO; | |
318 | break; | |
319 | } | |
05f091ab | 320 | |
1da177e4 | 321 | schedule(); |
48d70552 | 322 | set_current_state(TASK_INTERRUPTIBLE); |
1da177e4 LT |
323 | } |
324 | ||
325 | set_current_state(TASK_RUNNING); | |
326 | remove_wait_queue(&list->hiddev->wait, &wait); | |
327 | } | |
328 | ||
329 | if (retval) | |
330 | return retval; | |
331 | ||
332 | ||
05f091ab | 333 | while (list->head != list->tail && |
1da177e4 LT |
334 | retval + event_size <= count) { |
335 | if ((list->flags & HIDDEV_FLAG_UREF) == 0) { | |
336 | if (list->buffer[list->tail].field_index != | |
337 | HID_FIELD_INDEX_NONE) { | |
338 | struct hiddev_event event; | |
339 | event.hid = list->buffer[list->tail].usage_code; | |
340 | event.value = list->buffer[list->tail].value; | |
341 | if (copy_to_user(buffer + retval, &event, sizeof(struct hiddev_event))) | |
342 | return -EFAULT; | |
343 | retval += sizeof(struct hiddev_event); | |
344 | } | |
345 | } else { | |
346 | if (list->buffer[list->tail].field_index != HID_FIELD_INDEX_NONE || | |
347 | (list->flags & HIDDEV_FLAG_REPORT) != 0) { | |
348 | if (copy_to_user(buffer + retval, list->buffer + list->tail, sizeof(struct hiddev_usage_ref))) | |
349 | return -EFAULT; | |
350 | retval += sizeof(struct hiddev_usage_ref); | |
351 | } | |
352 | } | |
353 | list->tail = (list->tail + 1) & (HIDDEV_BUFFER_SIZE - 1); | |
354 | } | |
355 | ||
356 | } | |
357 | ||
358 | return retval; | |
359 | } | |
360 | ||
361 | /* | |
362 | * "poll" file op | |
363 | * No kernel lock - fine | |
364 | */ | |
365 | static unsigned int hiddev_poll(struct file *file, poll_table *wait) | |
366 | { | |
367 | struct hiddev_list *list = file->private_data; | |
826d5982 | 368 | |
1da177e4 LT |
369 | poll_wait(file, &list->hiddev->wait, wait); |
370 | if (list->head != list->tail) | |
371 | return POLLIN | POLLRDNORM; | |
372 | if (!list->hiddev->exist) | |
373 | return POLLERR | POLLHUP; | |
374 | return 0; | |
375 | } | |
376 | ||
377 | /* | |
378 | * "ioctl" file op | |
379 | */ | |
380 | static int hiddev_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) | |
381 | { | |
382 | struct hiddev_list *list = file->private_data; | |
383 | struct hiddev *hiddev = list->hiddev; | |
384 | struct hid_device *hid = hiddev->hid; | |
385 | struct usb_device *dev = hid->dev; | |
386 | struct hiddev_collection_info cinfo; | |
387 | struct hiddev_report_info rinfo; | |
388 | struct hiddev_field_info finfo; | |
826d5982 | 389 | struct hiddev_usage_ref_multi *uref_multi = NULL; |
1da177e4 LT |
390 | struct hiddev_usage_ref *uref; |
391 | struct hiddev_devinfo dinfo; | |
392 | struct hid_report *report; | |
393 | struct hid_field *field; | |
394 | void __user *user_arg = (void __user *)arg; | |
395 | int i; | |
396 | ||
397 | if (!hiddev->exist) | |
398 | return -EIO; | |
399 | ||
400 | switch (cmd) { | |
401 | ||
402 | case HIDIOCGVERSION: | |
403 | return put_user(HID_VERSION, (int __user *)arg); | |
404 | ||
405 | case HIDIOCAPPLICATION: | |
406 | if (arg < 0 || arg >= hid->maxapplication) | |
407 | return -EINVAL; | |
408 | ||
409 | for (i = 0; i < hid->maxcollection; i++) | |
05f091ab | 410 | if (hid->collection[i].type == |
1da177e4 LT |
411 | HID_COLLECTION_APPLICATION && arg-- == 0) |
412 | break; | |
05f091ab | 413 | |
1da177e4 LT |
414 | if (i == hid->maxcollection) |
415 | return -EINVAL; | |
416 | ||
417 | return hid->collection[i].usage; | |
418 | ||
419 | case HIDIOCGDEVINFO: | |
420 | dinfo.bustype = BUS_USB; | |
421 | dinfo.busnum = dev->bus->busnum; | |
422 | dinfo.devnum = dev->devnum; | |
423 | dinfo.ifnum = hid->ifnum; | |
424 | dinfo.vendor = le16_to_cpu(dev->descriptor.idVendor); | |
425 | dinfo.product = le16_to_cpu(dev->descriptor.idProduct); | |
426 | dinfo.version = le16_to_cpu(dev->descriptor.bcdDevice); | |
427 | dinfo.num_applications = hid->maxapplication; | |
428 | if (copy_to_user(user_arg, &dinfo, sizeof(dinfo))) | |
429 | return -EFAULT; | |
430 | ||
431 | return 0; | |
432 | ||
433 | case HIDIOCGFLAG: | |
434 | if (put_user(list->flags, (int __user *)arg)) | |
435 | return -EFAULT; | |
436 | ||
437 | return 0; | |
438 | ||
439 | case HIDIOCSFLAG: | |
440 | { | |
441 | int newflags; | |
442 | if (get_user(newflags, (int __user *)arg)) | |
443 | return -EFAULT; | |
444 | ||
445 | if ((newflags & ~HIDDEV_FLAGS) != 0 || | |
446 | ((newflags & HIDDEV_FLAG_REPORT) != 0 && | |
447 | (newflags & HIDDEV_FLAG_UREF) == 0)) | |
448 | return -EINVAL; | |
449 | ||
450 | list->flags = newflags; | |
451 | ||
452 | return 0; | |
453 | } | |
454 | ||
455 | case HIDIOCGSTRING: | |
456 | { | |
457 | int idx, len; | |
458 | char *buf; | |
459 | ||
460 | if (get_user(idx, (int __user *)arg)) | |
461 | return -EFAULT; | |
462 | ||
463 | if ((buf = kmalloc(HID_STRING_SIZE, GFP_KERNEL)) == NULL) | |
464 | return -ENOMEM; | |
465 | ||
466 | if ((len = usb_string(dev, idx, buf, HID_STRING_SIZE-1)) < 0) { | |
467 | kfree(buf); | |
468 | return -EINVAL; | |
469 | } | |
470 | ||
471 | if (copy_to_user(user_arg+sizeof(int), buf, len+1)) { | |
472 | kfree(buf); | |
473 | return -EFAULT; | |
474 | } | |
475 | ||
476 | kfree(buf); | |
477 | ||
478 | return len; | |
479 | } | |
480 | ||
481 | case HIDIOCINITREPORT: | |
482 | hid_init_reports(hid); | |
483 | ||
484 | return 0; | |
485 | ||
486 | case HIDIOCGREPORT: | |
487 | if (copy_from_user(&rinfo, user_arg, sizeof(rinfo))) | |
488 | return -EFAULT; | |
489 | ||
490 | if (rinfo.report_type == HID_REPORT_TYPE_OUTPUT) | |
491 | return -EINVAL; | |
492 | ||
493 | if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL) | |
494 | return -EINVAL; | |
495 | ||
496 | hid_submit_report(hid, report, USB_DIR_IN); | |
497 | hid_wait_io(hid); | |
498 | ||
499 | return 0; | |
500 | ||
501 | case HIDIOCSREPORT: | |
502 | if (copy_from_user(&rinfo, user_arg, sizeof(rinfo))) | |
503 | return -EFAULT; | |
504 | ||
505 | if (rinfo.report_type == HID_REPORT_TYPE_INPUT) | |
506 | return -EINVAL; | |
507 | ||
508 | if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL) | |
509 | return -EINVAL; | |
510 | ||
511 | hid_submit_report(hid, report, USB_DIR_OUT); | |
010988e8 | 512 | hid_wait_io(hid); |
1da177e4 LT |
513 | |
514 | return 0; | |
515 | ||
516 | case HIDIOCGREPORTINFO: | |
517 | if (copy_from_user(&rinfo, user_arg, sizeof(rinfo))) | |
518 | return -EFAULT; | |
519 | ||
520 | if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL) | |
521 | return -EINVAL; | |
522 | ||
523 | rinfo.num_fields = report->maxfield; | |
524 | ||
525 | if (copy_to_user(user_arg, &rinfo, sizeof(rinfo))) | |
526 | return -EFAULT; | |
527 | ||
528 | return 0; | |
529 | ||
530 | case HIDIOCGFIELDINFO: | |
531 | if (copy_from_user(&finfo, user_arg, sizeof(finfo))) | |
532 | return -EFAULT; | |
533 | rinfo.report_type = finfo.report_type; | |
534 | rinfo.report_id = finfo.report_id; | |
535 | if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL) | |
536 | return -EINVAL; | |
537 | ||
538 | if (finfo.field_index >= report->maxfield) | |
539 | return -EINVAL; | |
540 | ||
541 | field = report->field[finfo.field_index]; | |
542 | memset(&finfo, 0, sizeof(finfo)); | |
543 | finfo.report_type = rinfo.report_type; | |
544 | finfo.report_id = rinfo.report_id; | |
545 | finfo.field_index = field->report_count - 1; | |
546 | finfo.maxusage = field->maxusage; | |
547 | finfo.flags = field->flags; | |
548 | finfo.physical = field->physical; | |
549 | finfo.logical = field->logical; | |
550 | finfo.application = field->application; | |
551 | finfo.logical_minimum = field->logical_minimum; | |
552 | finfo.logical_maximum = field->logical_maximum; | |
553 | finfo.physical_minimum = field->physical_minimum; | |
554 | finfo.physical_maximum = field->physical_maximum; | |
555 | finfo.unit_exponent = field->unit_exponent; | |
556 | finfo.unit = field->unit; | |
557 | ||
558 | if (copy_to_user(user_arg, &finfo, sizeof(finfo))) | |
559 | return -EFAULT; | |
560 | ||
561 | return 0; | |
562 | ||
563 | case HIDIOCGUCODE: | |
564 | uref_multi = kmalloc(sizeof(struct hiddev_usage_ref_multi), GFP_KERNEL); | |
565 | if (!uref_multi) | |
566 | return -ENOMEM; | |
567 | uref = &uref_multi->uref; | |
05f091ab | 568 | if (copy_from_user(uref, user_arg, sizeof(*uref))) |
1da177e4 LT |
569 | goto fault; |
570 | ||
571 | rinfo.report_type = uref->report_type; | |
572 | rinfo.report_id = uref->report_id; | |
573 | if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL) | |
574 | goto inval; | |
575 | ||
576 | if (uref->field_index >= report->maxfield) | |
577 | goto inval; | |
578 | ||
579 | field = report->field[uref->field_index]; | |
580 | if (uref->usage_index >= field->maxusage) | |
581 | goto inval; | |
582 | ||
583 | uref->usage_code = field->usage[uref->usage_index].hid; | |
584 | ||
585 | if (copy_to_user(user_arg, uref, sizeof(*uref))) | |
586 | goto fault; | |
587 | ||
588 | kfree(uref_multi); | |
589 | return 0; | |
590 | ||
591 | case HIDIOCGUSAGE: | |
592 | case HIDIOCSUSAGE: | |
593 | case HIDIOCGUSAGES: | |
594 | case HIDIOCSUSAGES: | |
595 | case HIDIOCGCOLLECTIONINDEX: | |
596 | uref_multi = kmalloc(sizeof(struct hiddev_usage_ref_multi), GFP_KERNEL); | |
597 | if (!uref_multi) | |
598 | return -ENOMEM; | |
599 | uref = &uref_multi->uref; | |
600 | if (cmd == HIDIOCGUSAGES || cmd == HIDIOCSUSAGES) { | |
05f091ab | 601 | if (copy_from_user(uref_multi, user_arg, |
1da177e4 LT |
602 | sizeof(*uref_multi))) |
603 | goto fault; | |
604 | } else { | |
605 | if (copy_from_user(uref, user_arg, sizeof(*uref))) | |
606 | goto fault; | |
607 | } | |
608 | ||
05f091ab | 609 | if (cmd != HIDIOCGUSAGE && |
1da177e4 LT |
610 | cmd != HIDIOCGUSAGES && |
611 | uref->report_type == HID_REPORT_TYPE_INPUT) | |
612 | goto inval; | |
613 | ||
614 | if (uref->report_id == HID_REPORT_ID_UNKNOWN) { | |
615 | field = hiddev_lookup_usage(hid, uref); | |
616 | if (field == NULL) | |
617 | goto inval; | |
618 | } else { | |
619 | rinfo.report_type = uref->report_type; | |
620 | rinfo.report_id = uref->report_id; | |
621 | if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL) | |
622 | goto inval; | |
623 | ||
624 | if (uref->field_index >= report->maxfield) | |
625 | goto inval; | |
626 | ||
627 | field = report->field[uref->field_index]; | |
628 | ||
629 | if (cmd == HIDIOCGCOLLECTIONINDEX) { | |
630 | if (uref->usage_index >= field->maxusage) | |
631 | goto inval; | |
632 | } else if (uref->usage_index >= field->report_count) | |
633 | goto inval; | |
634 | ||
635 | else if ((cmd == HIDIOCGUSAGES || cmd == HIDIOCSUSAGES) && | |
636 | (uref_multi->num_values > HID_MAX_MULTI_USAGES || | |
6dea9347 | 637 | uref->usage_index + uref_multi->num_values > field->report_count)) |
1da177e4 LT |
638 | goto inval; |
639 | } | |
640 | ||
641 | switch (cmd) { | |
642 | case HIDIOCGUSAGE: | |
643 | uref->value = field->value[uref->usage_index]; | |
644 | if (copy_to_user(user_arg, uref, sizeof(*uref))) | |
645 | goto fault; | |
646 | goto goodreturn; | |
647 | ||
648 | case HIDIOCSUSAGE: | |
649 | field->value[uref->usage_index] = uref->value; | |
650 | goto goodreturn; | |
651 | ||
652 | case HIDIOCGCOLLECTIONINDEX: | |
653 | kfree(uref_multi); | |
654 | return field->usage[uref->usage_index].collection_index; | |
655 | case HIDIOCGUSAGES: | |
656 | for (i = 0; i < uref_multi->num_values; i++) | |
05f091ab | 657 | uref_multi->values[i] = |
1da177e4 | 658 | field->value[uref->usage_index + i]; |
05f091ab | 659 | if (copy_to_user(user_arg, uref_multi, |
1da177e4 LT |
660 | sizeof(*uref_multi))) |
661 | goto fault; | |
662 | goto goodreturn; | |
663 | case HIDIOCSUSAGES: | |
664 | for (i = 0; i < uref_multi->num_values; i++) | |
05f091ab DT |
665 | field->value[uref->usage_index + i] = |
666 | uref_multi->values[i]; | |
1da177e4 LT |
667 | goto goodreturn; |
668 | } | |
669 | ||
670 | goodreturn: | |
671 | kfree(uref_multi); | |
672 | return 0; | |
673 | fault: | |
674 | kfree(uref_multi); | |
675 | return -EFAULT; | |
05f091ab | 676 | inval: |
1da177e4 LT |
677 | kfree(uref_multi); |
678 | return -EINVAL; | |
679 | ||
680 | case HIDIOCGCOLLECTIONINFO: | |
681 | if (copy_from_user(&cinfo, user_arg, sizeof(cinfo))) | |
682 | return -EFAULT; | |
683 | ||
684 | if (cinfo.index >= hid->maxcollection) | |
685 | return -EINVAL; | |
686 | ||
687 | cinfo.type = hid->collection[cinfo.index].type; | |
688 | cinfo.usage = hid->collection[cinfo.index].usage; | |
689 | cinfo.level = hid->collection[cinfo.index].level; | |
690 | ||
691 | if (copy_to_user(user_arg, &cinfo, sizeof(cinfo))) | |
692 | return -EFAULT; | |
693 | return 0; | |
694 | ||
695 | default: | |
696 | ||
697 | if (_IOC_TYPE(cmd) != 'H' || _IOC_DIR(cmd) != _IOC_READ) | |
698 | return -EINVAL; | |
699 | ||
700 | if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGNAME(0))) { | |
701 | int len; | |
702 | if (!hid->name) | |
703 | return 0; | |
704 | len = strlen(hid->name) + 1; | |
705 | if (len > _IOC_SIZE(cmd)) | |
706 | len = _IOC_SIZE(cmd); | |
707 | return copy_to_user(user_arg, hid->name, len) ? | |
708 | -EFAULT : len; | |
709 | } | |
710 | ||
711 | if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGPHYS(0))) { | |
712 | int len; | |
713 | if (!hid->phys) | |
714 | return 0; | |
715 | len = strlen(hid->phys) + 1; | |
716 | if (len > _IOC_SIZE(cmd)) | |
717 | len = _IOC_SIZE(cmd); | |
718 | return copy_to_user(user_arg, hid->phys, len) ? | |
719 | -EFAULT : len; | |
720 | } | |
721 | } | |
722 | return -EINVAL; | |
723 | } | |
724 | ||
066202dd | 725 | static const struct file_operations hiddev_fops = { |
1da177e4 LT |
726 | .owner = THIS_MODULE, |
727 | .read = hiddev_read, | |
728 | .write = hiddev_write, | |
729 | .poll = hiddev_poll, | |
730 | .open = hiddev_open, | |
731 | .release = hiddev_release, | |
732 | .ioctl = hiddev_ioctl, | |
733 | .fasync = hiddev_fasync, | |
734 | }; | |
735 | ||
736 | static struct usb_class_driver hiddev_class = { | |
d6e5bcf4 | 737 | .name = "hiddev%d", |
1da177e4 | 738 | .fops = &hiddev_fops, |
05f091ab | 739 | .minor_base = HIDDEV_MINOR_BASE, |
1da177e4 LT |
740 | }; |
741 | ||
742 | /* | |
743 | * This is where hid.c calls us to connect a hid device to the hiddev driver | |
744 | */ | |
745 | int hiddev_connect(struct hid_device *hid) | |
746 | { | |
747 | struct hiddev *hiddev; | |
748 | int i; | |
749 | int retval; | |
750 | ||
751 | for (i = 0; i < hid->maxcollection; i++) | |
05f091ab | 752 | if (hid->collection[i].type == |
1da177e4 LT |
753 | HID_COLLECTION_APPLICATION && |
754 | !IS_INPUT_APPLICATION(hid->collection[i].usage)) | |
755 | break; | |
756 | ||
757 | if (i == hid->maxcollection && (hid->quirks & HID_QUIRK_HIDDEV) == 0) | |
758 | return -1; | |
759 | ||
bbdb7daf | 760 | if (!(hiddev = kzalloc(sizeof(struct hiddev), GFP_KERNEL))) |
1da177e4 | 761 | return -1; |
1da177e4 | 762 | |
05f091ab | 763 | retval = usb_register_dev(hid->intf, &hiddev_class); |
1da177e4 LT |
764 | if (retval) { |
765 | err("Not able to get a minor for this device."); | |
766 | kfree(hiddev); | |
767 | return -1; | |
768 | } | |
769 | ||
770 | init_waitqueue_head(&hiddev->wait); | |
826d5982 | 771 | INIT_LIST_HEAD(&hiddev->list); |
1da177e4 LT |
772 | hiddev->hid = hid; |
773 | hiddev->exist = 1; | |
774 | ||
05f091ab | 775 | hid->minor = hid->intf->minor; |
1da177e4 LT |
776 | hid->hiddev = hiddev; |
777 | ||
826d5982 DT |
778 | hiddev_table[hid->intf->minor - HIDDEV_MINOR_BASE] = hiddev; |
779 | ||
1da177e4 LT |
780 | return 0; |
781 | } | |
782 | ||
783 | /* | |
784 | * This is where hid.c calls us to disconnect a hiddev device from the | |
785 | * corresponding hid device (usually because the usb device has disconnected) | |
786 | */ | |
787 | static struct usb_class_driver hiddev_class; | |
788 | void hiddev_disconnect(struct hid_device *hid) | |
789 | { | |
790 | struct hiddev *hiddev = hid->hiddev; | |
791 | ||
792 | hiddev->exist = 0; | |
793 | ||
794 | hiddev_table[hiddev->hid->minor - HIDDEV_MINOR_BASE] = NULL; | |
795 | usb_deregister_dev(hiddev->hid->intf, &hiddev_class); | |
796 | ||
797 | if (hiddev->open) { | |
798 | hid_close(hiddev->hid); | |
799 | wake_up_interruptible(&hiddev->wait); | |
800 | } else { | |
801 | kfree(hiddev); | |
802 | } | |
803 | } | |
804 | ||
805 | /* Currently this driver is a USB driver. It's not a conventional one in | |
806 | * the sense that it doesn't probe at the USB level. Instead it waits to | |
807 | * be connected by HID through the hiddev_connect / hiddev_disconnect | |
808 | * routines. The reason to register as a USB device is to gain part of the | |
809 | * minor number space from the USB major. | |
810 | * | |
811 | * In theory, should the HID code be generalized to more than one physical | |
812 | * medium (say, IEEE 1384), this driver will probably need to register its | |
813 | * own major number, and in doing so, no longer need to register with USB. | |
814 | * At that point the probe routine and hiddev_driver struct below will no | |
815 | * longer be useful. | |
816 | */ | |
817 | ||
818 | ||
819 | /* We never attach in this manner, and rely on HID to connect us. This | |
820 | * is why there is no disconnect routine defined in the usb_driver either. | |
821 | */ | |
05f091ab | 822 | static int hiddev_usbd_probe(struct usb_interface *intf, |
1da177e4 LT |
823 | const struct usb_device_id *hiddev_info) |
824 | { | |
825 | return -ENODEV; | |
826 | } | |
827 | ||
828 | ||
829 | static /* const */ struct usb_driver hiddev_driver = { | |
1da177e4 LT |
830 | .name = "hiddev", |
831 | .probe = hiddev_usbd_probe, | |
832 | }; | |
833 | ||
834 | int __init hiddev_init(void) | |
835 | { | |
1da177e4 LT |
836 | return usb_register(&hiddev_driver); |
837 | } | |
838 | ||
839 | void hiddev_exit(void) | |
840 | { | |
841 | usb_deregister(&hiddev_driver); | |
1da177e4 | 842 | } |