1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * Copyright (c) 2001 Paul Stewart |
4 | * Copyright (c) 2001 Vojtech Pavlik |
5 | * |
6 | * HID char devices, giving access to raw HID device events. |
7 | */ |
8 | |
9 | /* |
10 | * |
11 | * Should you need to contact me, the author, you can do so either by |
12 | * e-mail - mail your message to Paul Stewart <stewart@wetlogic.net> |
13 | */ |
14 | |
15 | #include <linux/poll.h> |
16 | #include <linux/slab.h> |
17 | #include <linux/sched/signal.h> |
18 | #include <linux/module.h> |
19 | #include <linux/init.h> |
20 | #include <linux/input.h> |
21 | #include <linux/usb.h> |
22 | #include <linux/hid.h> |
23 | #include <linux/hiddev.h> |
24 | #include <linux/compat.h> |
25 | #include <linux/vmalloc.h> |
26 | #include <linux/nospec.h> |
27 | #include "usbhid.h" |
28 | |
29 | #ifdef CONFIG_USB_DYNAMIC_MINORS |
30 | #define HIDDEV_MINOR_BASE 0 |
31 | #define HIDDEV_MINORS 256 |
32 | #else |
33 | #define HIDDEV_MINOR_BASE 96 |
34 | #define HIDDEV_MINORS 16 |
35 | #endif |
36 | #define HIDDEV_BUFFER_SIZE 2048 |
37 | |
38 | struct hiddev_list { |
39 | struct hiddev_usage_ref buffer[HIDDEV_BUFFER_SIZE]; |
40 | int head; |
41 | int tail; |
42 | unsigned flags; |
43 | struct fasync_struct *fasync; |
44 | struct hiddev *hiddev; |
45 | struct list_head node; |
46 | struct mutex thread_lock; |
47 | }; |
48 | |
49 | /* |
50 | * Find a report, given the report's type and ID. The ID can be specified |
51 | * indirectly by REPORT_ID_FIRST (which returns the first report of the given |
52 | * type) or by (REPORT_ID_NEXT | old_id), which returns the next report of the |
53 | * given type which follows old_id. |
54 | */ |
55 | static struct hid_report * |
56 | hiddev_lookup_report(struct hid_device *hid, struct hiddev_report_info *rinfo) |
57 | { |
58 | unsigned int flags = rinfo->report_id & ~HID_REPORT_ID_MASK; |
59 | unsigned int rid = rinfo->report_id & HID_REPORT_ID_MASK; |
60 | struct hid_report_enum *report_enum; |
61 | struct hid_report *report; |
62 | struct list_head *list; |
63 | |
64 | if (rinfo->report_type < HID_REPORT_TYPE_MIN || |
65 | rinfo->report_type > HID_REPORT_TYPE_MAX) |
66 | return NULL; |
67 | |
68 | report_enum = hid->report_enum + |
69 | (rinfo->report_type - HID_REPORT_TYPE_MIN); |
70 | |
71 | switch (flags) { |
72 | case 0: /* Nothing to do -- report_id is already set correctly */ |
73 | break; |
74 | |
75 | case HID_REPORT_ID_FIRST: |
76 | if (list_empty(head: &report_enum->report_list)) |
77 | return NULL; |
78 | |
79 | list = report_enum->report_list.next; |
80 | report = list_entry(list, struct hid_report, list); |
81 | rinfo->report_id = report->id; |
82 | break; |
83 | |
84 | case HID_REPORT_ID_NEXT: |
85 | report = report_enum->report_id_hash[rid]; |
86 | if (!report) |
87 | return NULL; |
88 | |
89 | list = report->list.next; |
90 | if (list == &report_enum->report_list) |
91 | return NULL; |
92 | |
93 | report = list_entry(list, struct hid_report, list); |
94 | rinfo->report_id = report->id; |
95 | break; |
96 | |
97 | default: |
98 | return NULL; |
99 | } |
100 | |
101 | return report_enum->report_id_hash[rinfo->report_id]; |
102 | } |
103 | |
104 | /* |
105 | * Perform an exhaustive search of the report table for a usage, given its |
106 | * type and usage id. |
107 | */ |
108 | static struct hid_field * |
109 | hiddev_lookup_usage(struct hid_device *hid, struct hiddev_usage_ref *uref) |
110 | { |
111 | int i, j; |
112 | struct hid_report *report; |
113 | struct hid_report_enum *report_enum; |
114 | struct hid_field *field; |
115 | |
116 | if (uref->report_type < HID_REPORT_TYPE_MIN || |
117 | uref->report_type > HID_REPORT_TYPE_MAX) |
118 | return NULL; |
119 | |
120 | report_enum = hid->report_enum + |
121 | (uref->report_type - HID_REPORT_TYPE_MIN); |
122 | |
123 | list_for_each_entry(report, &report_enum->report_list, list) { |
124 | for (i = 0; i < report->maxfield; i++) { |
125 | field = report->field[i]; |
126 | for (j = 0; j < field->maxusage; j++) { |
127 | if (field->usage[j].hid == uref->usage_code) { |
128 | uref->report_id = report->id; |
129 | uref->field_index = i; |
130 | uref->usage_index = j; |
131 | return field; |
132 | } |
133 | } |
134 | } |
135 | } |
136 | |
137 | return NULL; |
138 | } |
139 | |
140 | static void hiddev_send_event(struct hid_device *hid, |
141 | struct hiddev_usage_ref *uref) |
142 | { |
143 | struct hiddev *hiddev = hid->hiddev; |
144 | struct hiddev_list *list; |
145 | unsigned long flags; |
146 | |
147 | spin_lock_irqsave(&hiddev->list_lock, flags); |
148 | list_for_each_entry(list, &hiddev->list, node) { |
149 | if (uref->field_index != HID_FIELD_INDEX_NONE || |
150 | (list->flags & HIDDEV_FLAG_REPORT) != 0) { |
151 | list->buffer[list->head] = *uref; |
152 | list->head = (list->head + 1) & |
153 | (HIDDEV_BUFFER_SIZE - 1); |
154 | kill_fasync(&list->fasync, SIGIO, POLL_IN); |
155 | } |
156 | } |
157 | spin_unlock_irqrestore(lock: &hiddev->list_lock, flags); |
158 | |
159 | wake_up_interruptible(&hiddev->wait); |
160 | } |
161 | |
162 | /* |
163 | * This is where hid.c calls into hiddev to pass an event that occurred over |
164 | * the interrupt pipe |
165 | */ |
166 | void hiddev_hid_event(struct hid_device *hid, struct hid_field *field, |
167 | struct hid_usage *usage, __s32 value) |
168 | { |
169 | unsigned type = field->report_type; |
170 | struct hiddev_usage_ref uref; |
171 | |
172 | uref.report_type = |
173 | (type == HID_INPUT_REPORT) ? HID_REPORT_TYPE_INPUT : |
174 | ((type == HID_OUTPUT_REPORT) ? HID_REPORT_TYPE_OUTPUT : |
175 | ((type == HID_FEATURE_REPORT) ? HID_REPORT_TYPE_FEATURE : 0)); |
176 | uref.report_id = field->report->id; |
177 | uref.field_index = field->index; |
178 | uref.usage_index = (usage - field->usage); |
179 | uref.usage_code = usage->hid; |
180 | uref.value = value; |
181 | |
182 | hiddev_send_event(hid, uref: &uref); |
183 | } |
184 | EXPORT_SYMBOL_GPL(hiddev_hid_event); |
185 | |
186 | void hiddev_report_event(struct hid_device *hid, struct hid_report *report) |
187 | { |
188 | unsigned type = report->type; |
189 | struct hiddev_usage_ref uref; |
190 | |
191 | memset(&uref, 0, sizeof(uref)); |
192 | uref.report_type = |
193 | (type == HID_INPUT_REPORT) ? HID_REPORT_TYPE_INPUT : |
194 | ((type == HID_OUTPUT_REPORT) ? HID_REPORT_TYPE_OUTPUT : |
195 | ((type == HID_FEATURE_REPORT) ? HID_REPORT_TYPE_FEATURE : 0)); |
196 | uref.report_id = report->id; |
197 | uref.field_index = HID_FIELD_INDEX_NONE; |
198 | |
199 | hiddev_send_event(hid, uref: &uref); |
200 | } |
201 | |
202 | /* |
203 | * fasync file op |
204 | */ |
205 | static int hiddev_fasync(int fd, struct file *file, int on) |
206 | { |
207 | struct hiddev_list *list = file->private_data; |
208 | |
209 | return fasync_helper(fd, file, on, &list->fasync); |
210 | } |
211 | |
212 | |
213 | /* |
214 | * release file op |
215 | */ |
216 | static int hiddev_release(struct inode * inode, struct file * file) |
217 | { |
218 | struct hiddev_list *list = file->private_data; |
219 | unsigned long flags; |
220 | |
221 | spin_lock_irqsave(&list->hiddev->list_lock, flags); |
222 | list_del(entry: &list->node); |
223 | spin_unlock_irqrestore(lock: &list->hiddev->list_lock, flags); |
224 | |
225 | mutex_lock(&list->hiddev->existancelock); |
226 | if (!--list->hiddev->open) { |
227 | if (list->hiddev->exist) { |
228 | hid_hw_close(hdev: list->hiddev->hid); |
229 | hid_hw_power(hdev: list->hiddev->hid, PM_HINT_NORMAL); |
230 | } else { |
231 | mutex_unlock(lock: &list->hiddev->existancelock); |
232 | kfree(objp: list->hiddev); |
233 | vfree(addr: list); |
234 | return 0; |
235 | } |
236 | } |
237 | |
238 | mutex_unlock(lock: &list->hiddev->existancelock); |
239 | vfree(addr: list); |
240 | |
241 | return 0; |
242 | } |
243 | |
244 | static int __hiddev_open(struct hiddev *hiddev, struct file *file) |
245 | { |
246 | struct hiddev_list *list; |
247 | int error; |
248 | |
249 | lockdep_assert_held(&hiddev->existancelock); |
250 | |
251 | list = vzalloc(size: sizeof(*list)); |
252 | if (!list) |
253 | return -ENOMEM; |
254 | |
255 | mutex_init(&list->thread_lock); |
256 | list->hiddev = hiddev; |
257 | |
258 | if (!hiddev->open++) { |
259 | error = hid_hw_power(hdev: hiddev->hid, PM_HINT_FULLON); |
260 | if (error < 0) |
261 | goto err_drop_count; |
262 | |
263 | error = hid_hw_open(hdev: hiddev->hid); |
264 | if (error < 0) |
265 | goto err_normal_power; |
266 | } |
267 | |
268 | spin_lock_irq(lock: &hiddev->list_lock); |
269 | list_add_tail(new: &list->node, head: &hiddev->list); |
270 | spin_unlock_irq(lock: &hiddev->list_lock); |
271 | |
272 | file->private_data = list; |
273 | |
274 | return 0; |
275 | |
276 | err_normal_power: |
277 | hid_hw_power(hdev: hiddev->hid, PM_HINT_NORMAL); |
278 | err_drop_count: |
279 | hiddev->open--; |
280 | vfree(addr: list); |
281 | return error; |
282 | } |
283 | |
284 | /* |
285 | * open file op |
286 | */ |
287 | static int hiddev_open(struct inode *inode, struct file *file) |
288 | { |
289 | struct usb_interface *intf; |
290 | struct hid_device *hid; |
291 | struct hiddev *hiddev; |
292 | int res; |
293 | |
294 | intf = usbhid_find_interface(minor: iminor(inode)); |
295 | if (!intf) |
296 | return -ENODEV; |
297 | |
298 | hid = usb_get_intfdata(intf); |
299 | hiddev = hid->hiddev; |
300 | |
301 | mutex_lock(&hiddev->existancelock); |
302 | res = hiddev->exist ? __hiddev_open(hiddev, file) : -ENODEV; |
303 | mutex_unlock(lock: &hiddev->existancelock); |
304 | |
305 | return res; |
306 | } |
307 | |
308 | /* |
309 | * "write" file op |
310 | */ |
311 | static ssize_t hiddev_write(struct file * file, const char __user * buffer, size_t count, loff_t *ppos) |
312 | { |
313 | return -EINVAL; |
314 | } |
315 | |
316 | /* |
317 | * "read" file op |
318 | */ |
319 | static ssize_t hiddev_read(struct file * file, char __user * buffer, size_t count, loff_t *ppos) |
320 | { |
321 | DEFINE_WAIT(wait); |
322 | struct hiddev_list *list = file->private_data; |
323 | int event_size; |
324 | int retval; |
325 | |
326 | event_size = ((list->flags & HIDDEV_FLAG_UREF) != 0) ? |
327 | sizeof(struct hiddev_usage_ref) : sizeof(struct hiddev_event); |
328 | |
329 | if (count < event_size) |
330 | return 0; |
331 | |
332 | /* lock against other threads */ |
333 | retval = mutex_lock_interruptible(&list->thread_lock); |
334 | if (retval) |
335 | return -ERESTARTSYS; |
336 | |
337 | while (retval == 0) { |
338 | if (list->head == list->tail) { |
339 | prepare_to_wait(wq_head: &list->hiddev->wait, wq_entry: &wait, TASK_INTERRUPTIBLE); |
340 | |
341 | while (list->head == list->tail) { |
342 | if (signal_pending(current)) { |
343 | retval = -ERESTARTSYS; |
344 | break; |
345 | } |
346 | if (!list->hiddev->exist) { |
347 | retval = -EIO; |
348 | break; |
349 | } |
350 | if (file->f_flags & O_NONBLOCK) { |
351 | retval = -EAGAIN; |
352 | break; |
353 | } |
354 | |
355 | /* let O_NONBLOCK tasks run */ |
356 | mutex_unlock(lock: &list->thread_lock); |
357 | schedule(); |
358 | if (mutex_lock_interruptible(&list->thread_lock)) { |
359 | finish_wait(wq_head: &list->hiddev->wait, wq_entry: &wait); |
360 | return -EINTR; |
361 | } |
362 | set_current_state(TASK_INTERRUPTIBLE); |
363 | } |
364 | finish_wait(wq_head: &list->hiddev->wait, wq_entry: &wait); |
365 | |
366 | } |
367 | |
368 | if (retval) { |
369 | mutex_unlock(lock: &list->thread_lock); |
370 | return retval; |
371 | } |
372 | |
373 | |
374 | while (list->head != list->tail && |
375 | retval + event_size <= count) { |
376 | if ((list->flags & HIDDEV_FLAG_UREF) == 0) { |
377 | if (list->buffer[list->tail].field_index != HID_FIELD_INDEX_NONE) { |
378 | struct hiddev_event event; |
379 | |
380 | event.hid = list->buffer[list->tail].usage_code; |
381 | event.value = list->buffer[list->tail].value; |
382 | if (copy_to_user(to: buffer + retval, from: &event, n: sizeof(struct hiddev_event))) { |
383 | mutex_unlock(lock: &list->thread_lock); |
384 | return -EFAULT; |
385 | } |
386 | retval += sizeof(struct hiddev_event); |
387 | } |
388 | } else { |
389 | if (list->buffer[list->tail].field_index != HID_FIELD_INDEX_NONE || |
390 | (list->flags & HIDDEV_FLAG_REPORT) != 0) { |
391 | |
392 | if (copy_to_user(to: buffer + retval, from: list->buffer + list->tail, n: sizeof(struct hiddev_usage_ref))) { |
393 | mutex_unlock(lock: &list->thread_lock); |
394 | return -EFAULT; |
395 | } |
396 | retval += sizeof(struct hiddev_usage_ref); |
397 | } |
398 | } |
399 | list->tail = (list->tail + 1) & (HIDDEV_BUFFER_SIZE - 1); |
400 | } |
401 | |
402 | } |
403 | mutex_unlock(lock: &list->thread_lock); |
404 | |
405 | return retval; |
406 | } |
407 | |
408 | /* |
409 | * "poll" file op |
410 | * No kernel lock - fine |
411 | */ |
412 | static __poll_t hiddev_poll(struct file *file, poll_table *wait) |
413 | { |
414 | struct hiddev_list *list = file->private_data; |
415 | |
416 | poll_wait(filp: file, wait_address: &list->hiddev->wait, p: wait); |
417 | if (list->head != list->tail) |
418 | return EPOLLIN | EPOLLRDNORM | EPOLLOUT; |
419 | if (!list->hiddev->exist) |
420 | return EPOLLERR | EPOLLHUP; |
421 | return 0; |
422 | } |
423 | |
424 | /* |
425 | * "ioctl" file op |
426 | */ |
427 | static noinline int hiddev_ioctl_usage(struct hiddev *hiddev, unsigned int cmd, void __user *user_arg) |
428 | { |
429 | struct hid_device *hid = hiddev->hid; |
430 | struct hiddev_report_info rinfo; |
431 | struct hiddev_usage_ref_multi *uref_multi = NULL; |
432 | struct hiddev_usage_ref *uref; |
433 | struct hid_report *report; |
434 | struct hid_field *field; |
435 | int i; |
436 | |
437 | uref_multi = kmalloc(size: sizeof(struct hiddev_usage_ref_multi), GFP_KERNEL); |
438 | if (!uref_multi) |
439 | return -ENOMEM; |
440 | uref = &uref_multi->uref; |
441 | if (cmd == HIDIOCGUSAGES || cmd == HIDIOCSUSAGES) { |
442 | if (copy_from_user(to: uref_multi, from: user_arg, |
443 | n: sizeof(*uref_multi))) |
444 | goto fault; |
445 | } else { |
446 | if (copy_from_user(to: uref, from: user_arg, n: sizeof(*uref))) |
447 | goto fault; |
448 | } |
449 | |
450 | switch (cmd) { |
451 | case HIDIOCGUCODE: |
452 | rinfo.report_type = uref->report_type; |
453 | rinfo.report_id = uref->report_id; |
454 | if ((report = hiddev_lookup_report(hid, rinfo: &rinfo)) == NULL) |
455 | goto inval; |
456 | |
457 | if (uref->field_index >= report->maxfield) |
458 | goto inval; |
459 | uref->field_index = array_index_nospec(uref->field_index, |
460 | report->maxfield); |
461 | |
462 | field = report->field[uref->field_index]; |
463 | if (uref->usage_index >= field->maxusage) |
464 | goto inval; |
465 | uref->usage_index = array_index_nospec(uref->usage_index, |
466 | field->maxusage); |
467 | |
468 | uref->usage_code = field->usage[uref->usage_index].hid; |
469 | |
470 | if (copy_to_user(to: user_arg, from: uref, n: sizeof(*uref))) |
471 | goto fault; |
472 | |
473 | goto goodreturn; |
474 | |
475 | default: |
476 | if (cmd != HIDIOCGUSAGE && |
477 | cmd != HIDIOCGUSAGES && |
478 | uref->report_type == HID_REPORT_TYPE_INPUT) |
479 | goto inval; |
480 | |
481 | if (uref->report_id == HID_REPORT_ID_UNKNOWN) { |
482 | field = hiddev_lookup_usage(hid, uref); |
483 | if (field == NULL) |
484 | goto inval; |
485 | } else { |
486 | rinfo.report_type = uref->report_type; |
487 | rinfo.report_id = uref->report_id; |
488 | if ((report = hiddev_lookup_report(hid, rinfo: &rinfo)) == NULL) |
489 | goto inval; |
490 | |
491 | if (uref->field_index >= report->maxfield) |
492 | goto inval; |
493 | uref->field_index = array_index_nospec(uref->field_index, |
494 | report->maxfield); |
495 | |
496 | field = report->field[uref->field_index]; |
497 | |
498 | if (cmd == HIDIOCGCOLLECTIONINDEX) { |
499 | if (uref->usage_index >= field->maxusage) |
500 | goto inval; |
501 | uref->usage_index = |
502 | array_index_nospec(uref->usage_index, |
503 | field->maxusage); |
504 | } else if (uref->usage_index >= field->report_count) |
505 | goto inval; |
506 | } |
507 | |
508 | if (cmd == HIDIOCGUSAGES || cmd == HIDIOCSUSAGES) { |
509 | if (uref_multi->num_values > HID_MAX_MULTI_USAGES || |
510 | uref->usage_index + uref_multi->num_values > |
511 | field->report_count) |
512 | goto inval; |
513 | |
514 | uref->usage_index = |
515 | array_index_nospec(uref->usage_index, |
516 | field->report_count - |
517 | uref_multi->num_values); |
518 | } |
519 | |
520 | switch (cmd) { |
521 | case HIDIOCGUSAGE: |
522 | if (uref->usage_index >= field->report_count) |
523 | goto inval; |
524 | uref->value = field->value[uref->usage_index]; |
525 | if (copy_to_user(to: user_arg, from: uref, n: sizeof(*uref))) |
526 | goto fault; |
527 | goto goodreturn; |
528 | |
529 | case HIDIOCSUSAGE: |
530 | if (uref->usage_index >= field->report_count) |
531 | goto inval; |
532 | field->value[uref->usage_index] = uref->value; |
533 | goto goodreturn; |
534 | |
535 | case HIDIOCGCOLLECTIONINDEX: |
536 | i = field->usage[uref->usage_index].collection_index; |
537 | kfree(objp: uref_multi); |
538 | return i; |
539 | case HIDIOCGUSAGES: |
540 | for (i = 0; i < uref_multi->num_values; i++) |
541 | uref_multi->values[i] = |
542 | field->value[uref->usage_index + i]; |
543 | if (copy_to_user(to: user_arg, from: uref_multi, |
544 | n: sizeof(*uref_multi))) |
545 | goto fault; |
546 | goto goodreturn; |
547 | case HIDIOCSUSAGES: |
548 | for (i = 0; i < uref_multi->num_values; i++) |
549 | field->value[uref->usage_index + i] = |
550 | uref_multi->values[i]; |
551 | goto goodreturn; |
552 | } |
553 | |
554 | goodreturn: |
555 | kfree(objp: uref_multi); |
556 | return 0; |
557 | fault: |
558 | kfree(objp: uref_multi); |
559 | return -EFAULT; |
560 | inval: |
561 | kfree(objp: uref_multi); |
562 | return -EINVAL; |
563 | } |
564 | } |
565 | |
566 | static noinline int hiddev_ioctl_string(struct hiddev *hiddev, unsigned int cmd, void __user *user_arg) |
567 | { |
568 | struct hid_device *hid = hiddev->hid; |
569 | struct usb_device *dev = hid_to_usb_dev(hid); |
570 | int idx, len; |
571 | char *buf; |
572 | |
573 | if (get_user(idx, (int __user *)user_arg)) |
574 | return -EFAULT; |
575 | |
576 | if ((buf = kmalloc(HID_STRING_SIZE, GFP_KERNEL)) == NULL) |
577 | return -ENOMEM; |
578 | |
579 | if ((len = usb_string(dev, index: idx, buf, HID_STRING_SIZE-1)) < 0) { |
580 | kfree(objp: buf); |
581 | return -EINVAL; |
582 | } |
583 | |
584 | if (copy_to_user(to: user_arg+sizeof(int), from: buf, n: len+1)) { |
585 | kfree(objp: buf); |
586 | return -EFAULT; |
587 | } |
588 | |
589 | kfree(objp: buf); |
590 | |
591 | return len; |
592 | } |
593 | |
594 | static long hiddev_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
595 | { |
596 | struct hiddev_list *list = file->private_data; |
597 | struct hiddev *hiddev = list->hiddev; |
598 | struct hid_device *hid; |
599 | struct hiddev_collection_info cinfo; |
600 | struct hiddev_report_info rinfo; |
601 | struct hiddev_field_info finfo; |
602 | struct hiddev_devinfo dinfo; |
603 | struct hid_report *report; |
604 | struct hid_field *field; |
605 | void __user *user_arg = (void __user *)arg; |
606 | int i, r = -EINVAL; |
607 | |
608 | /* Called without BKL by compat methods so no BKL taken */ |
609 | |
610 | mutex_lock(&hiddev->existancelock); |
611 | if (!hiddev->exist) { |
612 | r = -ENODEV; |
613 | goto ret_unlock; |
614 | } |
615 | |
616 | hid = hiddev->hid; |
617 | |
618 | switch (cmd) { |
619 | |
620 | case HIDIOCGVERSION: |
621 | r = put_user(HID_VERSION, (int __user *)arg) ? |
622 | -EFAULT : 0; |
623 | break; |
624 | |
625 | case HIDIOCAPPLICATION: |
626 | if (arg >= hid->maxapplication) |
627 | break; |
628 | |
629 | for (i = 0; i < hid->maxcollection; i++) |
630 | if (hid->collection[i].type == |
631 | HID_COLLECTION_APPLICATION && arg-- == 0) |
632 | break; |
633 | |
634 | if (i < hid->maxcollection) |
635 | r = hid->collection[i].usage; |
636 | break; |
637 | |
638 | case HIDIOCGDEVINFO: |
639 | { |
640 | struct usb_device *dev = hid_to_usb_dev(hid); |
641 | struct usbhid_device *usbhid = hid->driver_data; |
642 | |
643 | memset(&dinfo, 0, sizeof(dinfo)); |
644 | |
645 | dinfo.bustype = BUS_USB; |
646 | dinfo.busnum = dev->bus->busnum; |
647 | dinfo.devnum = dev->devnum; |
648 | dinfo.ifnum = usbhid->ifnum; |
649 | dinfo.vendor = le16_to_cpu(dev->descriptor.idVendor); |
650 | dinfo.product = le16_to_cpu(dev->descriptor.idProduct); |
651 | dinfo.version = le16_to_cpu(dev->descriptor.bcdDevice); |
652 | dinfo.num_applications = hid->maxapplication; |
653 | |
654 | r = copy_to_user(to: user_arg, from: &dinfo, n: sizeof(dinfo)) ? |
655 | -EFAULT : 0; |
656 | break; |
657 | } |
658 | |
659 | case HIDIOCGFLAG: |
660 | r = put_user(list->flags, (int __user *)arg) ? |
661 | -EFAULT : 0; |
662 | break; |
663 | |
664 | case HIDIOCSFLAG: |
665 | { |
666 | int newflags; |
667 | |
668 | if (get_user(newflags, (int __user *)arg)) { |
669 | r = -EFAULT; |
670 | break; |
671 | } |
672 | |
673 | if ((newflags & ~HIDDEV_FLAGS) != 0 || |
674 | ((newflags & HIDDEV_FLAG_REPORT) != 0 && |
675 | (newflags & HIDDEV_FLAG_UREF) == 0)) |
676 | break; |
677 | |
678 | list->flags = newflags; |
679 | |
680 | r = 0; |
681 | break; |
682 | } |
683 | |
684 | case HIDIOCGSTRING: |
685 | r = hiddev_ioctl_string(hiddev, cmd, user_arg); |
686 | break; |
687 | |
688 | case HIDIOCINITREPORT: |
689 | usbhid_init_reports(hid); |
690 | hiddev->initialized = true; |
691 | r = 0; |
692 | break; |
693 | |
694 | case HIDIOCGREPORT: |
695 | if (copy_from_user(to: &rinfo, from: user_arg, n: sizeof(rinfo))) { |
696 | r = -EFAULT; |
697 | break; |
698 | } |
699 | |
700 | if (rinfo.report_type == HID_REPORT_TYPE_OUTPUT) |
701 | break; |
702 | |
703 | report = hiddev_lookup_report(hid, rinfo: &rinfo); |
704 | if (report == NULL) |
705 | break; |
706 | |
707 | hid_hw_request(hdev: hid, report, reqtype: HID_REQ_GET_REPORT); |
708 | hid_hw_wait(hdev: hid); |
709 | |
710 | r = 0; |
711 | break; |
712 | |
713 | case HIDIOCSREPORT: |
714 | if (copy_from_user(to: &rinfo, from: user_arg, n: sizeof(rinfo))) { |
715 | r = -EFAULT; |
716 | break; |
717 | } |
718 | |
719 | if (rinfo.report_type == HID_REPORT_TYPE_INPUT) |
720 | break; |
721 | |
722 | report = hiddev_lookup_report(hid, rinfo: &rinfo); |
723 | if (report == NULL) |
724 | break; |
725 | |
726 | hid_hw_request(hdev: hid, report, reqtype: HID_REQ_SET_REPORT); |
727 | hid_hw_wait(hdev: hid); |
728 | |
729 | r = 0; |
730 | break; |
731 | |
732 | case HIDIOCGREPORTINFO: |
733 | if (copy_from_user(to: &rinfo, from: user_arg, n: sizeof(rinfo))) { |
734 | r = -EFAULT; |
735 | break; |
736 | } |
737 | |
738 | report = hiddev_lookup_report(hid, rinfo: &rinfo); |
739 | if (report == NULL) |
740 | break; |
741 | |
742 | rinfo.num_fields = report->maxfield; |
743 | |
744 | r = copy_to_user(to: user_arg, from: &rinfo, n: sizeof(rinfo)) ? |
745 | -EFAULT : 0; |
746 | break; |
747 | |
748 | case HIDIOCGFIELDINFO: |
749 | if (copy_from_user(to: &finfo, from: user_arg, n: sizeof(finfo))) { |
750 | r = -EFAULT; |
751 | break; |
752 | } |
753 | |
754 | rinfo.report_type = finfo.report_type; |
755 | rinfo.report_id = finfo.report_id; |
756 | |
757 | report = hiddev_lookup_report(hid, rinfo: &rinfo); |
758 | if (report == NULL) |
759 | break; |
760 | |
761 | if (finfo.field_index >= report->maxfield) |
762 | break; |
763 | finfo.field_index = array_index_nospec(finfo.field_index, |
764 | report->maxfield); |
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(to: user_arg, from: &finfo, n: sizeof(finfo)) ? |
784 | -EFAULT : 0; |
785 | break; |
786 | |
787 | case HIDIOCGUCODE: |
788 | case HIDIOCGUSAGE: |
789 | case HIDIOCSUSAGE: |
790 | case HIDIOCGUSAGES: |
791 | case HIDIOCSUSAGES: |
792 | case HIDIOCGCOLLECTIONINDEX: |
793 | if (!hiddev->initialized) { |
794 | usbhid_init_reports(hid); |
795 | hiddev->initialized = true; |
796 | } |
797 | r = hiddev_ioctl_usage(hiddev, cmd, user_arg); |
798 | break; |
799 | |
800 | case HIDIOCGCOLLECTIONINFO: |
801 | if (copy_from_user(to: &cinfo, from: user_arg, n: sizeof(cinfo))) { |
802 | r = -EFAULT; |
803 | break; |
804 | } |
805 | |
806 | if (cinfo.index >= hid->maxcollection) |
807 | break; |
808 | cinfo.index = array_index_nospec(cinfo.index, |
809 | hid->maxcollection); |
810 | |
811 | cinfo.type = hid->collection[cinfo.index].type; |
812 | cinfo.usage = hid->collection[cinfo.index].usage; |
813 | cinfo.level = hid->collection[cinfo.index].level; |
814 | |
815 | r = copy_to_user(to: user_arg, from: &cinfo, n: sizeof(cinfo)) ? |
816 | -EFAULT : 0; |
817 | break; |
818 | |
819 | default: |
820 | if (_IOC_TYPE(cmd) != 'H' || _IOC_DIR(cmd) != _IOC_READ) |
821 | break; |
822 | |
823 | if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGNAME(0))) { |
824 | int len = strlen(hid->name) + 1; |
825 | if (len > _IOC_SIZE(cmd)) |
826 | len = _IOC_SIZE(cmd); |
827 | r = copy_to_user(to: user_arg, from: hid->name, n: len) ? |
828 | -EFAULT : len; |
829 | break; |
830 | } |
831 | |
832 | if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGPHYS(0))) { |
833 | int len = strlen(hid->phys) + 1; |
834 | if (len > _IOC_SIZE(cmd)) |
835 | len = _IOC_SIZE(cmd); |
836 | r = copy_to_user(to: user_arg, from: hid->phys, n: len) ? |
837 | -EFAULT : len; |
838 | break; |
839 | } |
840 | } |
841 | |
842 | ret_unlock: |
843 | mutex_unlock(lock: &hiddev->existancelock); |
844 | return r; |
845 | } |
846 | |
847 | static const struct file_operations hiddev_fops = { |
848 | .owner = THIS_MODULE, |
849 | .read = hiddev_read, |
850 | .write = hiddev_write, |
851 | .poll = hiddev_poll, |
852 | .open = hiddev_open, |
853 | .release = hiddev_release, |
854 | .unlocked_ioctl = hiddev_ioctl, |
855 | .fasync = hiddev_fasync, |
856 | .compat_ioctl = compat_ptr_ioctl, |
857 | .llseek = noop_llseek, |
858 | }; |
859 | |
860 | static char *hiddev_devnode(const struct device *dev, umode_t *mode) |
861 | { |
862 | return kasprintf(GFP_KERNEL, fmt: "usb/%s" , dev_name(dev)); |
863 | } |
864 | |
865 | static struct usb_class_driver hiddev_class = { |
866 | .name = "hiddev%d" , |
867 | .devnode = hiddev_devnode, |
868 | .fops = &hiddev_fops, |
869 | .minor_base = HIDDEV_MINOR_BASE, |
870 | }; |
871 | |
872 | /* |
873 | * This is where hid.c calls us to connect a hid device to the hiddev driver |
874 | */ |
875 | int hiddev_connect(struct hid_device *hid, unsigned int force) |
876 | { |
877 | struct hiddev *hiddev; |
878 | struct usbhid_device *usbhid = hid->driver_data; |
879 | int retval; |
880 | |
881 | if (!force) { |
882 | unsigned int i; |
883 | for (i = 0; i < hid->maxcollection; i++) |
884 | if (hid->collection[i].type == |
885 | HID_COLLECTION_APPLICATION && |
886 | !IS_INPUT_APPLICATION(hid->collection[i].usage)) |
887 | break; |
888 | |
889 | if (i == hid->maxcollection) |
890 | return -EINVAL; |
891 | } |
892 | |
893 | if (!(hiddev = kzalloc(size: sizeof(struct hiddev), GFP_KERNEL))) |
894 | return -ENOMEM; |
895 | |
896 | init_waitqueue_head(&hiddev->wait); |
897 | INIT_LIST_HEAD(list: &hiddev->list); |
898 | spin_lock_init(&hiddev->list_lock); |
899 | mutex_init(&hiddev->existancelock); |
900 | hid->hiddev = hiddev; |
901 | hiddev->hid = hid; |
902 | hiddev->exist = 1; |
903 | retval = usb_register_dev(intf: usbhid->intf, class_driver: &hiddev_class); |
904 | if (retval) { |
905 | hid_err(hid, "Not able to get a minor for this device\n" ); |
906 | hid->hiddev = NULL; |
907 | kfree(objp: hiddev); |
908 | return retval; |
909 | } |
910 | |
911 | /* |
912 | * If HID_QUIRK_NO_INIT_REPORTS is set, make sure we don't initialize |
913 | * the reports. |
914 | */ |
915 | hiddev->initialized = hid->quirks & HID_QUIRK_NO_INIT_REPORTS; |
916 | |
917 | hiddev->minor = usbhid->intf->minor; |
918 | |
919 | return 0; |
920 | } |
921 | |
922 | /* |
923 | * This is where hid.c calls us to disconnect a hiddev device from the |
924 | * corresponding hid device (usually because the usb device has disconnected) |
925 | */ |
926 | static struct usb_class_driver hiddev_class; |
927 | void hiddev_disconnect(struct hid_device *hid) |
928 | { |
929 | struct hiddev *hiddev = hid->hiddev; |
930 | struct usbhid_device *usbhid = hid->driver_data; |
931 | |
932 | usb_deregister_dev(intf: usbhid->intf, class_driver: &hiddev_class); |
933 | |
934 | mutex_lock(&hiddev->existancelock); |
935 | hiddev->exist = 0; |
936 | |
937 | if (hiddev->open) { |
938 | hid_hw_close(hdev: hiddev->hid); |
939 | wake_up_interruptible(&hiddev->wait); |
940 | mutex_unlock(lock: &hiddev->existancelock); |
941 | } else { |
942 | mutex_unlock(lock: &hiddev->existancelock); |
943 | kfree(objp: hiddev); |
944 | } |
945 | } |
946 | |