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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/sched/signal.h> | |
31 | #include <linux/module.h> | |
32 | #include <linux/init.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 <linux/vmalloc.h> | |
39 | #include "usbhid.h" | |
40 | ||
41 | #ifdef CONFIG_USB_DYNAMIC_MINORS | |
42 | #define HIDDEV_MINOR_BASE 0 | |
43 | #define HIDDEV_MINORS 256 | |
44 | #else | |
45 | #define HIDDEV_MINOR_BASE 96 | |
46 | #define HIDDEV_MINORS 16 | |
47 | #endif | |
48 | #define HIDDEV_BUFFER_SIZE 2048 | |
49 | ||
50 | struct hiddev { | |
51 | int exist; | |
52 | int open; | |
53 | struct mutex existancelock; | |
54 | wait_queue_head_t wait; | |
55 | struct hid_device *hid; | |
56 | struct list_head list; | |
57 | spinlock_t list_lock; | |
58 | }; | |
59 | ||
60 | struct hiddev_list { | |
61 | struct hiddev_usage_ref buffer[HIDDEV_BUFFER_SIZE]; | |
62 | int head; | |
63 | int tail; | |
64 | unsigned flags; | |
65 | struct fasync_struct *fasync; | |
66 | struct hiddev *hiddev; | |
67 | struct list_head node; | |
68 | struct mutex thread_lock; | |
69 | }; | |
70 | ||
71 | /* | |
72 | * Find a report, given the report's type and ID. The ID can be specified | |
73 | * indirectly by REPORT_ID_FIRST (which returns the first report of the given | |
74 | * type) or by (REPORT_ID_NEXT | old_id), which returns the next report of the | |
75 | * given type which follows old_id. | |
76 | */ | |
77 | static struct hid_report * | |
78 | hiddev_lookup_report(struct hid_device *hid, struct hiddev_report_info *rinfo) | |
79 | { | |
80 | unsigned int flags = rinfo->report_id & ~HID_REPORT_ID_MASK; | |
81 | unsigned int rid = rinfo->report_id & HID_REPORT_ID_MASK; | |
82 | struct hid_report_enum *report_enum; | |
83 | struct hid_report *report; | |
84 | struct list_head *list; | |
85 | ||
86 | if (rinfo->report_type < HID_REPORT_TYPE_MIN || | |
87 | rinfo->report_type > HID_REPORT_TYPE_MAX) | |
88 | return NULL; | |
89 | ||
90 | report_enum = hid->report_enum + | |
91 | (rinfo->report_type - HID_REPORT_TYPE_MIN); | |
92 | ||
93 | switch (flags) { | |
94 | case 0: /* Nothing to do -- report_id is already set correctly */ | |
95 | break; | |
96 | ||
97 | case HID_REPORT_ID_FIRST: | |
98 | if (list_empty(&report_enum->report_list)) | |
99 | return NULL; | |
100 | ||
101 | list = report_enum->report_list.next; | |
102 | report = list_entry(list, struct hid_report, list); | |
103 | rinfo->report_id = report->id; | |
104 | break; | |
105 | ||
106 | case HID_REPORT_ID_NEXT: | |
107 | report = report_enum->report_id_hash[rid]; | |
108 | if (!report) | |
109 | return NULL; | |
110 | ||
111 | list = report->list.next; | |
112 | if (list == &report_enum->report_list) | |
113 | return NULL; | |
114 | ||
115 | report = list_entry(list, struct hid_report, list); | |
116 | rinfo->report_id = report->id; | |
117 | break; | |
118 | ||
119 | default: | |
120 | return NULL; | |
121 | } | |
122 | ||
123 | return report_enum->report_id_hash[rinfo->report_id]; | |
124 | } | |
125 | ||
126 | /* | |
127 | * Perform an exhaustive search of the report table for a usage, given its | |
128 | * type and usage id. | |
129 | */ | |
130 | static struct hid_field * | |
131 | hiddev_lookup_usage(struct hid_device *hid, struct hiddev_usage_ref *uref) | |
132 | { | |
133 | int i, j; | |
134 | struct hid_report *report; | |
135 | struct hid_report_enum *report_enum; | |
136 | struct hid_field *field; | |
137 | ||
138 | if (uref->report_type < HID_REPORT_TYPE_MIN || | |
139 | uref->report_type > HID_REPORT_TYPE_MAX) | |
140 | return NULL; | |
141 | ||
142 | report_enum = hid->report_enum + | |
143 | (uref->report_type - HID_REPORT_TYPE_MIN); | |
144 | ||
145 | list_for_each_entry(report, &report_enum->report_list, list) { | |
146 | for (i = 0; i < report->maxfield; i++) { | |
147 | field = report->field[i]; | |
148 | for (j = 0; j < field->maxusage; j++) { | |
149 | if (field->usage[j].hid == uref->usage_code) { | |
150 | uref->report_id = report->id; | |
151 | uref->field_index = i; | |
152 | uref->usage_index = j; | |
153 | return field; | |
154 | } | |
155 | } | |
156 | } | |
157 | } | |
158 | ||
159 | return NULL; | |
160 | } | |
161 | ||
162 | static void hiddev_send_event(struct hid_device *hid, | |
163 | struct hiddev_usage_ref *uref) | |
164 | { | |
165 | struct hiddev *hiddev = hid->hiddev; | |
166 | struct hiddev_list *list; | |
167 | unsigned long flags; | |
168 | ||
169 | spin_lock_irqsave(&hiddev->list_lock, flags); | |
170 | list_for_each_entry(list, &hiddev->list, node) { | |
171 | if (uref->field_index != HID_FIELD_INDEX_NONE || | |
172 | (list->flags & HIDDEV_FLAG_REPORT) != 0) { | |
173 | list->buffer[list->head] = *uref; | |
174 | list->head = (list->head + 1) & | |
175 | (HIDDEV_BUFFER_SIZE - 1); | |
176 | kill_fasync(&list->fasync, SIGIO, POLL_IN); | |
177 | } | |
178 | } | |
179 | spin_unlock_irqrestore(&hiddev->list_lock, flags); | |
180 | ||
181 | wake_up_interruptible(&hiddev->wait); | |
182 | } | |
183 | ||
184 | /* | |
185 | * This is where hid.c calls into hiddev to pass an event that occurred over | |
186 | * the interrupt pipe | |
187 | */ | |
188 | void hiddev_hid_event(struct hid_device *hid, struct hid_field *field, | |
189 | struct hid_usage *usage, __s32 value) | |
190 | { | |
191 | unsigned type = field->report_type; | |
192 | struct hiddev_usage_ref uref; | |
193 | ||
194 | uref.report_type = | |
195 | (type == HID_INPUT_REPORT) ? HID_REPORT_TYPE_INPUT : | |
196 | ((type == HID_OUTPUT_REPORT) ? HID_REPORT_TYPE_OUTPUT : | |
197 | ((type == HID_FEATURE_REPORT) ? HID_REPORT_TYPE_FEATURE : 0)); | |
198 | uref.report_id = field->report->id; | |
199 | uref.field_index = field->index; | |
200 | uref.usage_index = (usage - field->usage); | |
201 | uref.usage_code = usage->hid; | |
202 | uref.value = value; | |
203 | ||
204 | hiddev_send_event(hid, &uref); | |
205 | } | |
206 | EXPORT_SYMBOL_GPL(hiddev_hid_event); | |
207 | ||
208 | void hiddev_report_event(struct hid_device *hid, struct hid_report *report) | |
209 | { | |
210 | unsigned type = report->type; | |
211 | struct hiddev_usage_ref uref; | |
212 | ||
213 | memset(&uref, 0, sizeof(uref)); | |
214 | uref.report_type = | |
215 | (type == HID_INPUT_REPORT) ? HID_REPORT_TYPE_INPUT : | |
216 | ((type == HID_OUTPUT_REPORT) ? HID_REPORT_TYPE_OUTPUT : | |
217 | ((type == HID_FEATURE_REPORT) ? HID_REPORT_TYPE_FEATURE : 0)); | |
218 | uref.report_id = report->id; | |
219 | uref.field_index = HID_FIELD_INDEX_NONE; | |
220 | ||
221 | hiddev_send_event(hid, &uref); | |
222 | } | |
223 | ||
224 | /* | |
225 | * fasync file op | |
226 | */ | |
227 | static int hiddev_fasync(int fd, struct file *file, int on) | |
228 | { | |
229 | struct hiddev_list *list = file->private_data; | |
230 | ||
231 | return fasync_helper(fd, file, on, &list->fasync); | |
232 | } | |
233 | ||
234 | ||
235 | /* | |
236 | * release file op | |
237 | */ | |
238 | static int hiddev_release(struct inode * inode, struct file * file) | |
239 | { | |
240 | struct hiddev_list *list = file->private_data; | |
241 | unsigned long flags; | |
242 | ||
243 | spin_lock_irqsave(&list->hiddev->list_lock, flags); | |
244 | list_del(&list->node); | |
245 | spin_unlock_irqrestore(&list->hiddev->list_lock, flags); | |
246 | ||
247 | mutex_lock(&list->hiddev->existancelock); | |
248 | if (!--list->hiddev->open) { | |
249 | if (list->hiddev->exist) { | |
250 | usbhid_close(list->hiddev->hid); | |
251 | usbhid_put_power(list->hiddev->hid); | |
252 | } else { | |
253 | mutex_unlock(&list->hiddev->existancelock); | |
254 | kfree(list->hiddev); | |
255 | vfree(list); | |
256 | return 0; | |
257 | } | |
258 | } | |
259 | ||
260 | mutex_unlock(&list->hiddev->existancelock); | |
261 | vfree(list); | |
262 | ||
263 | return 0; | |
264 | } | |
265 | ||
266 | /* | |
267 | * open file op | |
268 | */ | |
269 | static int hiddev_open(struct inode *inode, struct file *file) | |
270 | { | |
271 | struct hiddev_list *list; | |
272 | struct usb_interface *intf; | |
273 | struct hid_device *hid; | |
274 | struct hiddev *hiddev; | |
275 | int res; | |
276 | ||
277 | intf = usbhid_find_interface(iminor(inode)); | |
278 | if (!intf) | |
279 | return -ENODEV; | |
280 | hid = usb_get_intfdata(intf); | |
281 | hiddev = hid->hiddev; | |
282 | ||
283 | if (!(list = vzalloc(sizeof(struct hiddev_list)))) | |
284 | return -ENOMEM; | |
285 | mutex_init(&list->thread_lock); | |
286 | list->hiddev = hiddev; | |
287 | file->private_data = list; | |
288 | ||
289 | /* | |
290 | * no need for locking because the USB major number | |
291 | * is shared which usbcore guards against disconnect | |
292 | */ | |
293 | if (list->hiddev->exist) { | |
294 | if (!list->hiddev->open++) { | |
295 | res = usbhid_open(hiddev->hid); | |
296 | if (res < 0) { | |
297 | res = -EIO; | |
298 | goto bail; | |
299 | } | |
300 | } | |
301 | } else { | |
302 | res = -ENODEV; | |
303 | goto bail; | |
304 | } | |
305 | ||
306 | spin_lock_irq(&list->hiddev->list_lock); | |
307 | list_add_tail(&list->node, &hiddev->list); | |
308 | spin_unlock_irq(&list->hiddev->list_lock); | |
309 | ||
310 | mutex_lock(&hiddev->existancelock); | |
311 | if (!list->hiddev->open++) | |
312 | if (list->hiddev->exist) { | |
313 | struct hid_device *hid = hiddev->hid; | |
314 | res = usbhid_get_power(hid); | |
315 | if (res < 0) { | |
316 | res = -EIO; | |
317 | goto bail_unlock; | |
318 | } | |
319 | usbhid_open(hid); | |
320 | } | |
321 | mutex_unlock(&hiddev->existancelock); | |
322 | return 0; | |
323 | bail_unlock: | |
324 | mutex_unlock(&hiddev->existancelock); | |
325 | bail: | |
326 | file->private_data = NULL; | |
327 | vfree(list); | |
328 | return res; | |
329 | } | |
330 | ||
331 | /* | |
332 | * "write" file op | |
333 | */ | |
334 | static ssize_t hiddev_write(struct file * file, const char __user * buffer, size_t count, loff_t *ppos) | |
335 | { | |
336 | return -EINVAL; | |
337 | } | |
338 | ||
339 | /* | |
340 | * "read" file op | |
341 | */ | |
342 | static ssize_t hiddev_read(struct file * file, char __user * buffer, size_t count, loff_t *ppos) | |
343 | { | |
344 | DEFINE_WAIT(wait); | |
345 | struct hiddev_list *list = file->private_data; | |
346 | int event_size; | |
347 | int retval; | |
348 | ||
349 | event_size = ((list->flags & HIDDEV_FLAG_UREF) != 0) ? | |
350 | sizeof(struct hiddev_usage_ref) : sizeof(struct hiddev_event); | |
351 | ||
352 | if (count < event_size) | |
353 | return 0; | |
354 | ||
355 | /* lock against other threads */ | |
356 | retval = mutex_lock_interruptible(&list->thread_lock); | |
357 | if (retval) | |
358 | return -ERESTARTSYS; | |
359 | ||
360 | while (retval == 0) { | |
361 | if (list->head == list->tail) { | |
362 | prepare_to_wait(&list->hiddev->wait, &wait, TASK_INTERRUPTIBLE); | |
363 | ||
364 | while (list->head == list->tail) { | |
365 | if (signal_pending(current)) { | |
366 | retval = -ERESTARTSYS; | |
367 | break; | |
368 | } | |
369 | if (!list->hiddev->exist) { | |
370 | retval = -EIO; | |
371 | break; | |
372 | } | |
373 | if (file->f_flags & O_NONBLOCK) { | |
374 | retval = -EAGAIN; | |
375 | break; | |
376 | } | |
377 | ||
378 | /* let O_NONBLOCK tasks run */ | |
379 | mutex_unlock(&list->thread_lock); | |
380 | schedule(); | |
381 | if (mutex_lock_interruptible(&list->thread_lock)) { | |
382 | finish_wait(&list->hiddev->wait, &wait); | |
383 | return -EINTR; | |
384 | } | |
385 | set_current_state(TASK_INTERRUPTIBLE); | |
386 | } | |
387 | finish_wait(&list->hiddev->wait, &wait); | |
388 | ||
389 | } | |
390 | ||
391 | if (retval) { | |
392 | mutex_unlock(&list->thread_lock); | |
393 | return retval; | |
394 | } | |
395 | ||
396 | ||
397 | while (list->head != list->tail && | |
398 | retval + event_size <= count) { | |
399 | if ((list->flags & HIDDEV_FLAG_UREF) == 0) { | |
400 | if (list->buffer[list->tail].field_index != HID_FIELD_INDEX_NONE) { | |
401 | struct hiddev_event event; | |
402 | ||
403 | event.hid = list->buffer[list->tail].usage_code; | |
404 | event.value = list->buffer[list->tail].value; | |
405 | if (copy_to_user(buffer + retval, &event, sizeof(struct hiddev_event))) { | |
406 | mutex_unlock(&list->thread_lock); | |
407 | return -EFAULT; | |
408 | } | |
409 | retval += sizeof(struct hiddev_event); | |
410 | } | |
411 | } else { | |
412 | if (list->buffer[list->tail].field_index != HID_FIELD_INDEX_NONE || | |
413 | (list->flags & HIDDEV_FLAG_REPORT) != 0) { | |
414 | ||
415 | if (copy_to_user(buffer + retval, list->buffer + list->tail, sizeof(struct hiddev_usage_ref))) { | |
416 | mutex_unlock(&list->thread_lock); | |
417 | return -EFAULT; | |
418 | } | |
419 | retval += sizeof(struct hiddev_usage_ref); | |
420 | } | |
421 | } | |
422 | list->tail = (list->tail + 1) & (HIDDEV_BUFFER_SIZE - 1); | |
423 | } | |
424 | ||
425 | } | |
426 | mutex_unlock(&list->thread_lock); | |
427 | ||
428 | return retval; | |
429 | } | |
430 | ||
431 | /* | |
432 | * "poll" file op | |
433 | * No kernel lock - fine | |
434 | */ | |
435 | static unsigned int hiddev_poll(struct file *file, poll_table *wait) | |
436 | { | |
437 | struct hiddev_list *list = file->private_data; | |
438 | ||
439 | poll_wait(file, &list->hiddev->wait, wait); | |
440 | if (list->head != list->tail) | |
441 | return POLLIN | POLLRDNORM; | |
442 | if (!list->hiddev->exist) | |
443 | return POLLERR | POLLHUP; | |
444 | return 0; | |
445 | } | |
446 | ||
447 | /* | |
448 | * "ioctl" file op | |
449 | */ | |
450 | static noinline int hiddev_ioctl_usage(struct hiddev *hiddev, unsigned int cmd, void __user *user_arg) | |
451 | { | |
452 | struct hid_device *hid = hiddev->hid; | |
453 | struct hiddev_report_info rinfo; | |
454 | struct hiddev_usage_ref_multi *uref_multi = NULL; | |
455 | struct hiddev_usage_ref *uref; | |
456 | struct hid_report *report; | |
457 | struct hid_field *field; | |
458 | int i; | |
459 | ||
460 | uref_multi = kmalloc(sizeof(struct hiddev_usage_ref_multi), GFP_KERNEL); | |
461 | if (!uref_multi) | |
462 | return -ENOMEM; | |
463 | uref = &uref_multi->uref; | |
464 | if (cmd == HIDIOCGUSAGES || cmd == HIDIOCSUSAGES) { | |
465 | if (copy_from_user(uref_multi, user_arg, | |
466 | sizeof(*uref_multi))) | |
467 | goto fault; | |
468 | } else { | |
469 | if (copy_from_user(uref, user_arg, sizeof(*uref))) | |
470 | goto fault; | |
471 | } | |
472 | ||
473 | switch (cmd) { | |
474 | case HIDIOCGUCODE: | |
475 | rinfo.report_type = uref->report_type; | |
476 | rinfo.report_id = uref->report_id; | |
477 | if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL) | |
478 | goto inval; | |
479 | ||
480 | if (uref->field_index >= report->maxfield) | |
481 | goto inval; | |
482 | ||
483 | field = report->field[uref->field_index]; | |
484 | if (uref->usage_index >= field->maxusage) | |
485 | goto inval; | |
486 | ||
487 | uref->usage_code = field->usage[uref->usage_index].hid; | |
488 | ||
489 | if (copy_to_user(user_arg, uref, sizeof(*uref))) | |
490 | goto fault; | |
491 | ||
492 | goto goodreturn; | |
493 | ||
494 | default: | |
495 | if (cmd != HIDIOCGUSAGE && | |
496 | cmd != HIDIOCGUSAGES && | |
497 | uref->report_type == HID_REPORT_TYPE_INPUT) | |
498 | goto inval; | |
499 | ||
500 | if (uref->report_id == HID_REPORT_ID_UNKNOWN) { | |
501 | field = hiddev_lookup_usage(hid, uref); | |
502 | if (field == NULL) | |
503 | goto inval; | |
504 | } else { | |
505 | rinfo.report_type = uref->report_type; | |
506 | rinfo.report_id = uref->report_id; | |
507 | if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL) | |
508 | goto inval; | |
509 | ||
510 | if (uref->field_index >= report->maxfield) | |
511 | goto inval; | |
512 | ||
513 | field = report->field[uref->field_index]; | |
514 | ||
515 | if (cmd == HIDIOCGCOLLECTIONINDEX) { | |
516 | if (uref->usage_index >= field->maxusage) | |
517 | goto inval; | |
518 | } else if (uref->usage_index >= field->report_count) | |
519 | goto inval; | |
520 | } | |
521 | ||
522 | if ((cmd == HIDIOCGUSAGES || cmd == HIDIOCSUSAGES) && | |
523 | (uref_multi->num_values > HID_MAX_MULTI_USAGES || | |
524 | uref->usage_index + uref_multi->num_values > field->report_count)) | |
525 | goto inval; | |
526 | ||
527 | switch (cmd) { | |
528 | case HIDIOCGUSAGE: | |
529 | uref->value = field->value[uref->usage_index]; | |
530 | if (copy_to_user(user_arg, uref, sizeof(*uref))) | |
531 | goto fault; | |
532 | goto goodreturn; | |
533 | ||
534 | case HIDIOCSUSAGE: | |
535 | field->value[uref->usage_index] = uref->value; | |
536 | goto goodreturn; | |
537 | ||
538 | case HIDIOCGCOLLECTIONINDEX: | |
539 | i = field->usage[uref->usage_index].collection_index; | |
540 | kfree(uref_multi); | |
541 | return i; | |
542 | case HIDIOCGUSAGES: | |
543 | for (i = 0; i < uref_multi->num_values; i++) | |
544 | uref_multi->values[i] = | |
545 | field->value[uref->usage_index + i]; | |
546 | if (copy_to_user(user_arg, uref_multi, | |
547 | sizeof(*uref_multi))) | |
548 | goto fault; | |
549 | goto goodreturn; | |
550 | case HIDIOCSUSAGES: | |
551 | for (i = 0; i < uref_multi->num_values; i++) | |
552 | field->value[uref->usage_index + i] = | |
553 | uref_multi->values[i]; | |
554 | goto goodreturn; | |
555 | } | |
556 | ||
557 | goodreturn: | |
558 | kfree(uref_multi); | |
559 | return 0; | |
560 | fault: | |
561 | kfree(uref_multi); | |
562 | return -EFAULT; | |
563 | inval: | |
564 | kfree(uref_multi); | |
565 | return -EINVAL; | |
566 | } | |
567 | } | |
568 | ||
569 | static noinline int hiddev_ioctl_string(struct hiddev *hiddev, unsigned int cmd, void __user *user_arg) | |
570 | { | |
571 | struct hid_device *hid = hiddev->hid; | |
572 | struct usb_device *dev = hid_to_usb_dev(hid); | |
573 | int idx, len; | |
574 | char *buf; | |
575 | ||
576 | if (get_user(idx, (int __user *)user_arg)) | |
577 | return -EFAULT; | |
578 | ||
579 | if ((buf = kmalloc(HID_STRING_SIZE, GFP_KERNEL)) == NULL) | |
580 | return -ENOMEM; | |
581 | ||
582 | if ((len = usb_string(dev, idx, buf, HID_STRING_SIZE-1)) < 0) { | |
583 | kfree(buf); | |
584 | return -EINVAL; | |
585 | } | |
586 | ||
587 | if (copy_to_user(user_arg+sizeof(int), buf, len+1)) { | |
588 | kfree(buf); | |
589 | return -EFAULT; | |
590 | } | |
591 | ||
592 | kfree(buf); | |
593 | ||
594 | return len; | |
595 | } | |
596 | ||
597 | static long hiddev_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
598 | { | |
599 | struct hiddev_list *list = file->private_data; | |
600 | struct hiddev *hiddev = list->hiddev; | |
601 | struct hid_device *hid; | |
602 | struct hiddev_collection_info cinfo; | |
603 | struct hiddev_report_info rinfo; | |
604 | struct hiddev_field_info finfo; | |
605 | struct hiddev_devinfo dinfo; | |
606 | struct hid_report *report; | |
607 | struct hid_field *field; | |
608 | void __user *user_arg = (void __user *)arg; | |
609 | int i, r = -EINVAL; | |
610 | ||
611 | /* Called without BKL by compat methods so no BKL taken */ | |
612 | ||
613 | mutex_lock(&hiddev->existancelock); | |
614 | if (!hiddev->exist) { | |
615 | r = -ENODEV; | |
616 | goto ret_unlock; | |
617 | } | |
618 | ||
619 | hid = hiddev->hid; | |
620 | ||
621 | switch (cmd) { | |
622 | ||
623 | case HIDIOCGVERSION: | |
624 | r = put_user(HID_VERSION, (int __user *)arg) ? | |
625 | -EFAULT : 0; | |
626 | break; | |
627 | ||
628 | case HIDIOCAPPLICATION: | |
629 | if (arg >= hid->maxapplication) | |
630 | break; | |
631 | ||
632 | for (i = 0; i < hid->maxcollection; i++) | |
633 | if (hid->collection[i].type == | |
634 | HID_COLLECTION_APPLICATION && arg-- == 0) | |
635 | break; | |
636 | ||
637 | if (i < hid->maxcollection) | |
638 | r = hid->collection[i].usage; | |
639 | break; | |
640 | ||
641 | case HIDIOCGDEVINFO: | |
642 | { | |
643 | struct usb_device *dev = hid_to_usb_dev(hid); | |
644 | struct usbhid_device *usbhid = hid->driver_data; | |
645 | ||
646 | memset(&dinfo, 0, sizeof(dinfo)); | |
647 | ||
648 | dinfo.bustype = BUS_USB; | |
649 | dinfo.busnum = dev->bus->busnum; | |
650 | dinfo.devnum = dev->devnum; | |
651 | dinfo.ifnum = usbhid->ifnum; | |
652 | dinfo.vendor = le16_to_cpu(dev->descriptor.idVendor); | |
653 | dinfo.product = le16_to_cpu(dev->descriptor.idProduct); | |
654 | dinfo.version = le16_to_cpu(dev->descriptor.bcdDevice); | |
655 | dinfo.num_applications = hid->maxapplication; | |
656 | ||
657 | r = copy_to_user(user_arg, &dinfo, sizeof(dinfo)) ? | |
658 | -EFAULT : 0; | |
659 | break; | |
660 | } | |
661 | ||
662 | case HIDIOCGFLAG: | |
663 | r = put_user(list->flags, (int __user *)arg) ? | |
664 | -EFAULT : 0; | |
665 | break; | |
666 | ||
667 | case HIDIOCSFLAG: | |
668 | { | |
669 | int newflags; | |
670 | ||
671 | if (get_user(newflags, (int __user *)arg)) { | |
672 | r = -EFAULT; | |
673 | break; | |
674 | } | |
675 | ||
676 | if ((newflags & ~HIDDEV_FLAGS) != 0 || | |
677 | ((newflags & HIDDEV_FLAG_REPORT) != 0 && | |
678 | (newflags & HIDDEV_FLAG_UREF) == 0)) | |
679 | break; | |
680 | ||
681 | list->flags = newflags; | |
682 | ||
683 | r = 0; | |
684 | break; | |
685 | } | |
686 | ||
687 | case HIDIOCGSTRING: | |
688 | r = hiddev_ioctl_string(hiddev, cmd, user_arg); | |
689 | break; | |
690 | ||
691 | case HIDIOCINITREPORT: | |
692 | usbhid_init_reports(hid); | |
693 | r = 0; | |
694 | break; | |
695 | ||
696 | case HIDIOCGREPORT: | |
697 | if (copy_from_user(&rinfo, user_arg, sizeof(rinfo))) { | |
698 | r = -EFAULT; | |
699 | break; | |
700 | } | |
701 | ||
702 | if (rinfo.report_type == HID_REPORT_TYPE_OUTPUT) | |
703 | break; | |
704 | ||
705 | report = hiddev_lookup_report(hid, &rinfo); | |
706 | if (report == NULL) | |
707 | break; | |
708 | ||
709 | hid_hw_request(hid, report, HID_REQ_GET_REPORT); | |
710 | hid_hw_wait(hid); | |
711 | ||
712 | r = 0; | |
713 | break; | |
714 | ||
715 | case HIDIOCSREPORT: | |
716 | if (copy_from_user(&rinfo, user_arg, sizeof(rinfo))) { | |
717 | r = -EFAULT; | |
718 | break; | |
719 | } | |
720 | ||
721 | if (rinfo.report_type == HID_REPORT_TYPE_INPUT) | |
722 | break; | |
723 | ||
724 | report = hiddev_lookup_report(hid, &rinfo); | |
725 | if (report == NULL) | |
726 | break; | |
727 | ||
728 | hid_hw_request(hid, report, HID_REQ_SET_REPORT); | |
729 | hid_hw_wait(hid); | |
730 | ||
731 | r = 0; | |
732 | break; | |
733 | ||
734 | case HIDIOCGREPORTINFO: | |
735 | if (copy_from_user(&rinfo, user_arg, sizeof(rinfo))) { | |
736 | r = -EFAULT; | |
737 | break; | |
738 | } | |
739 | ||
740 | report = hiddev_lookup_report(hid, &rinfo); | |
741 | if (report == NULL) | |
742 | break; | |
743 | ||
744 | rinfo.num_fields = report->maxfield; | |
745 | ||
746 | r = copy_to_user(user_arg, &rinfo, sizeof(rinfo)) ? | |
747 | -EFAULT : 0; | |
748 | break; | |
749 | ||
750 | case HIDIOCGFIELDINFO: | |
751 | if (copy_from_user(&finfo, user_arg, sizeof(finfo))) { | |
752 | r = -EFAULT; | |
753 | break; | |
754 | } | |
755 | ||
756 | rinfo.report_type = finfo.report_type; | |
757 | rinfo.report_id = finfo.report_id; | |
758 | ||
759 | report = hiddev_lookup_report(hid, &rinfo); | |
760 | if (report == NULL) | |
761 | break; | |
762 | ||
763 | if (finfo.field_index >= report->maxfield) | |
764 | break; | |
765 | ||
766 | field = report->field[finfo.field_index]; | |
767 | memset(&finfo, 0, sizeof(finfo)); | |
768 | finfo.report_type = rinfo.report_type; | |
769 | finfo.report_id = rinfo.report_id; | |
770 | finfo.field_index = field->report_count - 1; | |
771 | finfo.maxusage = field->maxusage; | |
772 | finfo.flags = field->flags; | |
773 | finfo.physical = field->physical; | |
774 | finfo.logical = field->logical; | |
775 | finfo.application = field->application; | |
776 | finfo.logical_minimum = field->logical_minimum; | |
777 | finfo.logical_maximum = field->logical_maximum; | |
778 | finfo.physical_minimum = field->physical_minimum; | |
779 | finfo.physical_maximum = field->physical_maximum; | |
780 | finfo.unit_exponent = field->unit_exponent; | |
781 | finfo.unit = field->unit; | |
782 | ||
783 | r = copy_to_user(user_arg, &finfo, sizeof(finfo)) ? | |
784 | -EFAULT : 0; | |
785 | break; | |
786 | ||
787 | case HIDIOCGUCODE: | |
788 | /* fall through */ | |
789 | case HIDIOCGUSAGE: | |
790 | case HIDIOCSUSAGE: | |
791 | case HIDIOCGUSAGES: | |
792 | case HIDIOCSUSAGES: | |
793 | case HIDIOCGCOLLECTIONINDEX: | |
794 | r = hiddev_ioctl_usage(hiddev, cmd, user_arg); | |
795 | break; | |
796 | ||
797 | case HIDIOCGCOLLECTIONINFO: | |
798 | if (copy_from_user(&cinfo, user_arg, sizeof(cinfo))) { | |
799 | r = -EFAULT; | |
800 | break; | |
801 | } | |
802 | ||
803 | if (cinfo.index >= hid->maxcollection) | |
804 | break; | |
805 | ||
806 | cinfo.type = hid->collection[cinfo.index].type; | |
807 | cinfo.usage = hid->collection[cinfo.index].usage; | |
808 | cinfo.level = hid->collection[cinfo.index].level; | |
809 | ||
810 | r = copy_to_user(user_arg, &cinfo, sizeof(cinfo)) ? | |
811 | -EFAULT : 0; | |
812 | break; | |
813 | ||
814 | default: | |
815 | if (_IOC_TYPE(cmd) != 'H' || _IOC_DIR(cmd) != _IOC_READ) | |
816 | break; | |
817 | ||
818 | if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGNAME(0))) { | |
819 | int len = strlen(hid->name) + 1; | |
820 | if (len > _IOC_SIZE(cmd)) | |
821 | len = _IOC_SIZE(cmd); | |
822 | r = copy_to_user(user_arg, hid->name, len) ? | |
823 | -EFAULT : len; | |
824 | break; | |
825 | } | |
826 | ||
827 | if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGPHYS(0))) { | |
828 | int len = strlen(hid->phys) + 1; | |
829 | if (len > _IOC_SIZE(cmd)) | |
830 | len = _IOC_SIZE(cmd); | |
831 | r = copy_to_user(user_arg, hid->phys, len) ? | |
832 | -EFAULT : len; | |
833 | break; | |
834 | } | |
835 | } | |
836 | ||
837 | ret_unlock: | |
838 | mutex_unlock(&hiddev->existancelock); | |
839 | return r; | |
840 | } | |
841 | ||
842 | #ifdef CONFIG_COMPAT | |
843 | static long hiddev_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
844 | { | |
845 | return hiddev_ioctl(file, cmd, (unsigned long)compat_ptr(arg)); | |
846 | } | |
847 | #endif | |
848 | ||
849 | static const struct file_operations hiddev_fops = { | |
850 | .owner = THIS_MODULE, | |
851 | .read = hiddev_read, | |
852 | .write = hiddev_write, | |
853 | .poll = hiddev_poll, | |
854 | .open = hiddev_open, | |
855 | .release = hiddev_release, | |
856 | .unlocked_ioctl = hiddev_ioctl, | |
857 | .fasync = hiddev_fasync, | |
858 | #ifdef CONFIG_COMPAT | |
859 | .compat_ioctl = hiddev_compat_ioctl, | |
860 | #endif | |
861 | .llseek = noop_llseek, | |
862 | }; | |
863 | ||
864 | static char *hiddev_devnode(struct device *dev, umode_t *mode) | |
865 | { | |
866 | return kasprintf(GFP_KERNEL, "usb/%s", dev_name(dev)); | |
867 | } | |
868 | ||
869 | static struct usb_class_driver hiddev_class = { | |
870 | .name = "hiddev%d", | |
871 | .devnode = hiddev_devnode, | |
872 | .fops = &hiddev_fops, | |
873 | .minor_base = HIDDEV_MINOR_BASE, | |
874 | }; | |
875 | ||
876 | /* | |
877 | * This is where hid.c calls us to connect a hid device to the hiddev driver | |
878 | */ | |
879 | int hiddev_connect(struct hid_device *hid, unsigned int force) | |
880 | { | |
881 | struct hiddev *hiddev; | |
882 | struct usbhid_device *usbhid = hid->driver_data; | |
883 | int retval; | |
884 | ||
885 | if (!force) { | |
886 | unsigned int i; | |
887 | for (i = 0; i < hid->maxcollection; i++) | |
888 | if (hid->collection[i].type == | |
889 | HID_COLLECTION_APPLICATION && | |
890 | !IS_INPUT_APPLICATION(hid->collection[i].usage)) | |
891 | break; | |
892 | ||
893 | if (i == hid->maxcollection) | |
894 | return -1; | |
895 | } | |
896 | ||
897 | if (!(hiddev = kzalloc(sizeof(struct hiddev), GFP_KERNEL))) | |
898 | return -1; | |
899 | ||
900 | init_waitqueue_head(&hiddev->wait); | |
901 | INIT_LIST_HEAD(&hiddev->list); | |
902 | spin_lock_init(&hiddev->list_lock); | |
903 | mutex_init(&hiddev->existancelock); | |
904 | hid->hiddev = hiddev; | |
905 | hiddev->hid = hid; | |
906 | hiddev->exist = 1; | |
907 | retval = usb_register_dev(usbhid->intf, &hiddev_class); | |
908 | if (retval) { | |
909 | hid_err(hid, "Not able to get a minor for this device\n"); | |
910 | hid->hiddev = NULL; | |
911 | kfree(hiddev); | |
912 | return -1; | |
913 | } | |
914 | return 0; | |
915 | } | |
916 | ||
917 | /* | |
918 | * This is where hid.c calls us to disconnect a hiddev device from the | |
919 | * corresponding hid device (usually because the usb device has disconnected) | |
920 | */ | |
921 | static struct usb_class_driver hiddev_class; | |
922 | void hiddev_disconnect(struct hid_device *hid) | |
923 | { | |
924 | struct hiddev *hiddev = hid->hiddev; | |
925 | struct usbhid_device *usbhid = hid->driver_data; | |
926 | ||
927 | usb_deregister_dev(usbhid->intf, &hiddev_class); | |
928 | ||
929 | mutex_lock(&hiddev->existancelock); | |
930 | hiddev->exist = 0; | |
931 | ||
932 | if (hiddev->open) { | |
933 | mutex_unlock(&hiddev->existancelock); | |
934 | usbhid_close(hiddev->hid); | |
935 | wake_up_interruptible(&hiddev->wait); | |
936 | } else { | |
937 | mutex_unlock(&hiddev->existancelock); | |
938 | kfree(hiddev); | |
939 | } | |
940 | } |