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1a59d1b8 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
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. | |
1da177e4 LT |
7 | */ |
8 | ||
9 | /* | |
1da177e4 LT |
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 | ||
1da177e4 LT |
15 | #include <linux/poll.h> |
16 | #include <linux/slab.h> | |
174cd4b1 | 17 | #include <linux/sched/signal.h> |
1da177e4 LT |
18 | #include <linux/module.h> |
19 | #include <linux/init.h> | |
1da177e4 LT |
20 | #include <linux/input.h> |
21 | #include <linux/usb.h> | |
dde5845a | 22 | #include <linux/hid.h> |
1da177e4 | 23 | #include <linux/hiddev.h> |
bb6c8d8f | 24 | #include <linux/compat.h> |
d4f0e4da | 25 | #include <linux/vmalloc.h> |
4f65245f | 26 | #include <linux/nospec.h> |
dde5845a | 27 | #include "usbhid.h" |
1da177e4 LT |
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 | |
affbb8c6 | 36 | #define HIDDEV_BUFFER_SIZE 2048 |
1da177e4 | 37 | |
1da177e4 LT |
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; | |
826d5982 | 45 | struct list_head node; |
07903407 | 46 | struct mutex thread_lock; |
1da177e4 LT |
47 | }; |
48 | ||
1da177e4 LT |
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 | { | |
826d5982 DT |
58 | unsigned int flags = rinfo->report_id & ~HID_REPORT_ID_MASK; |
59 | unsigned int rid = rinfo->report_id & HID_REPORT_ID_MASK; | |
1da177e4 | 60 | struct hid_report_enum *report_enum; |
826d5982 | 61 | struct hid_report *report; |
1da177e4 LT |
62 | struct list_head *list; |
63 | ||
64 | if (rinfo->report_type < HID_REPORT_TYPE_MIN || | |
826d5982 DT |
65 | rinfo->report_type > HID_REPORT_TYPE_MAX) |
66 | return NULL; | |
1da177e4 LT |
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: | |
826d5982 | 76 | if (list_empty(&report_enum->report_list)) |
1da177e4 | 77 | return NULL; |
826d5982 DT |
78 | |
79 | list = report_enum->report_list.next; | |
80 | report = list_entry(list, struct hid_report, list); | |
81 | rinfo->report_id = report->id; | |
1da177e4 | 82 | break; |
05f091ab | 83 | |
1da177e4 | 84 | case HID_REPORT_ID_NEXT: |
826d5982 DT |
85 | report = report_enum->report_id_hash[rid]; |
86 | if (!report) | |
1da177e4 | 87 | return NULL; |
826d5982 DT |
88 | |
89 | list = report->list.next; | |
1da177e4 LT |
90 | if (list == &report_enum->report_list) |
91 | return NULL; | |
826d5982 DT |
92 | |
93 | report = list_entry(list, struct hid_report, list); | |
94 | rinfo->report_id = report->id; | |
1da177e4 | 95 | break; |
05f091ab | 96 | |
1da177e4 LT |
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 || | |
826d5982 DT |
117 | uref->report_type > HID_REPORT_TYPE_MAX) |
118 | return NULL; | |
1da177e4 LT |
119 | |
120 | report_enum = hid->report_enum + | |
121 | (uref->report_type - HID_REPORT_TYPE_MIN); | |
122 | ||
826d5982 | 123 | list_for_each_entry(report, &report_enum->report_list, list) { |
1da177e4 LT |
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 | } | |
826d5982 | 135 | } |
1da177e4 LT |
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; | |
826d5982 | 144 | struct hiddev_list *list; |
cdcb44e8 | 145 | unsigned long flags; |
1da177e4 | 146 | |
cdcb44e8 | 147 | spin_lock_irqsave(&hiddev->list_lock, flags); |
826d5982 | 148 | list_for_each_entry(list, &hiddev->list, node) { |
1da177e4 LT |
149 | if (uref->field_index != HID_FIELD_INDEX_NONE || |
150 | (list->flags & HIDDEV_FLAG_REPORT) != 0) { | |
151 | list->buffer[list->head] = *uref; | |
05f091ab | 152 | list->head = (list->head + 1) & |
1da177e4 LT |
153 | (HIDDEV_BUFFER_SIZE - 1); |
154 | kill_fasync(&list->fasync, SIGIO, POLL_IN); | |
155 | } | |
1da177e4 | 156 | } |
cdcb44e8 | 157 | spin_unlock_irqrestore(&hiddev->list_lock, flags); |
1da177e4 LT |
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, | |
7d12e780 | 167 | struct hid_usage *usage, __s32 value) |
1da177e4 LT |
168 | { |
169 | unsigned type = field->report_type; | |
170 | struct hiddev_usage_ref uref; | |
171 | ||
05f091ab | 172 | uref.report_type = |
1da177e4 | 173 | (type == HID_INPUT_REPORT) ? HID_REPORT_TYPE_INPUT : |
05f091ab | 174 | ((type == HID_OUTPUT_REPORT) ? HID_REPORT_TYPE_OUTPUT : |
826d5982 | 175 | ((type == HID_FEATURE_REPORT) ? HID_REPORT_TYPE_FEATURE : 0)); |
1da177e4 LT |
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); | |
183 | } | |
229695e5 | 184 | EXPORT_SYMBOL_GPL(hiddev_hid_event); |
1da177e4 LT |
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)); | |
05f091ab | 192 | uref.report_type = |
1da177e4 | 193 | (type == HID_INPUT_REPORT) ? HID_REPORT_TYPE_INPUT : |
05f091ab | 194 | ((type == HID_OUTPUT_REPORT) ? HID_REPORT_TYPE_OUTPUT : |
826d5982 | 195 | ((type == HID_FEATURE_REPORT) ? HID_REPORT_TYPE_FEATURE : 0)); |
1da177e4 LT |
196 | uref.report_id = report->id; |
197 | uref.field_index = HID_FIELD_INDEX_NONE; | |
198 | ||
199 | hiddev_send_event(hid, &uref); | |
200 | } | |
aa8de2f0 | 201 | |
1da177e4 LT |
202 | /* |
203 | * fasync file op | |
204 | */ | |
205 | static int hiddev_fasync(int fd, struct file *file, int on) | |
206 | { | |
1da177e4 | 207 | struct hiddev_list *list = file->private_data; |
826d5982 | 208 | |
60aa4924 | 209 | return fasync_helper(fd, file, on, &list->fasync); |
1da177e4 LT |
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; | |
cdcb44e8 | 219 | unsigned long flags; |
1da177e4 | 220 | |
cdcb44e8 | 221 | spin_lock_irqsave(&list->hiddev->list_lock, flags); |
826d5982 | 222 | list_del(&list->node); |
cdcb44e8 | 223 | spin_unlock_irqrestore(&list->hiddev->list_lock, flags); |
1da177e4 | 224 | |
6cb4b040 | 225 | mutex_lock(&list->hiddev->existancelock); |
1da177e4 | 226 | if (!--list->hiddev->open) { |
0361a28d | 227 | if (list->hiddev->exist) { |
d36b7d4c | 228 | hid_hw_close(list->hiddev->hid); |
9a83563f | 229 | hid_hw_power(list->hiddev->hid, PM_HINT_NORMAL); |
0361a28d | 230 | } else { |
5c699d7d | 231 | mutex_unlock(&list->hiddev->existancelock); |
1da177e4 | 232 | kfree(list->hiddev); |
d4f0e4da | 233 | vfree(list); |
5c699d7d | 234 | return 0; |
0361a28d | 235 | } |
1da177e4 LT |
236 | } |
237 | ||
6cb4b040 | 238 | mutex_unlock(&list->hiddev->existancelock); |
d4f0e4da | 239 | vfree(list); |
1da177e4 LT |
240 | |
241 | return 0; | |
242 | } | |
243 | ||
18a1b06e DT |
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(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(hiddev->hid, PM_HINT_FULLON); | |
260 | if (error < 0) | |
261 | goto err_drop_count; | |
262 | ||
263 | error = hid_hw_open(hiddev->hid); | |
264 | if (error < 0) | |
265 | goto err_normal_power; | |
266 | } | |
267 | ||
268 | spin_lock_irq(&hiddev->list_lock); | |
269 | list_add_tail(&list->node, &hiddev->list); | |
270 | spin_unlock_irq(&hiddev->list_lock); | |
271 | ||
272 | file->private_data = list; | |
273 | ||
274 | return 0; | |
275 | ||
276 | err_normal_power: | |
277 | hid_hw_power(hiddev->hid, PM_HINT_NORMAL); | |
278 | err_drop_count: | |
279 | hiddev->open--; | |
280 | vfree(list); | |
281 | return error; | |
282 | } | |
283 | ||
1da177e4 LT |
284 | /* |
285 | * open file op | |
286 | */ | |
826d5982 DT |
287 | static int hiddev_open(struct inode *inode, struct file *file) |
288 | { | |
bd25f4dd | 289 | struct usb_interface *intf; |
9c9e54a8 | 290 | struct hid_device *hid; |
bd25f4dd AB |
291 | struct hiddev *hiddev; |
292 | int res; | |
1da177e4 | 293 | |
8fe294ca | 294 | intf = usbhid_find_interface(iminor(inode)); |
bd25f4dd | 295 | if (!intf) |
1da177e4 | 296 | return -ENODEV; |
18a1b06e | 297 | |
9c9e54a8 JK |
298 | hid = usb_get_intfdata(intf); |
299 | hiddev = hid->hiddev; | |
1da177e4 | 300 | |
6cb4b040 | 301 | mutex_lock(&hiddev->existancelock); |
18a1b06e | 302 | res = hiddev->exist ? __hiddev_open(hiddev, file) : -ENODEV; |
6cb4b040 | 303 | mutex_unlock(&hiddev->existancelock); |
6d4472d7 | 304 | |
07903407 | 305 | return res; |
1da177e4 LT |
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 | { | |
96fe2ab8 | 321 | DEFINE_WAIT(wait); |
1da177e4 LT |
322 | struct hiddev_list *list = file->private_data; |
323 | int event_size; | |
07903407 | 324 | int retval; |
1da177e4 LT |
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 | ||
07903407 ON |
332 | /* lock against other threads */ |
333 | retval = mutex_lock_interruptible(&list->thread_lock); | |
334 | if (retval) | |
335 | return -ERESTARTSYS; | |
336 | ||
1da177e4 LT |
337 | while (retval == 0) { |
338 | if (list->head == list->tail) { | |
07903407 | 339 | prepare_to_wait(&list->hiddev->wait, &wait, TASK_INTERRUPTIBLE); |
05f091ab | 340 | |
1da177e4 | 341 | while (list->head == list->tail) { |
1da177e4 LT |
342 | if (signal_pending(current)) { |
343 | retval = -ERESTARTSYS; | |
344 | break; | |
345 | } | |
346 | if (!list->hiddev->exist) { | |
347 | retval = -EIO; | |
348 | break; | |
349 | } | |
13f19624 JK |
350 | if (file->f_flags & O_NONBLOCK) { |
351 | retval = -EAGAIN; | |
352 | break; | |
353 | } | |
05f091ab | 354 | |
07903407 ON |
355 | /* let O_NONBLOCK tasks run */ |
356 | mutex_unlock(&list->thread_lock); | |
1da177e4 | 357 | schedule(); |
06268b2a PW |
358 | if (mutex_lock_interruptible(&list->thread_lock)) { |
359 | finish_wait(&list->hiddev->wait, &wait); | |
07903407 | 360 | return -EINTR; |
06268b2a | 361 | } |
48d70552 | 362 | set_current_state(TASK_INTERRUPTIBLE); |
1da177e4 | 363 | } |
07903407 | 364 | finish_wait(&list->hiddev->wait, &wait); |
1da177e4 | 365 | |
1da177e4 LT |
366 | } |
367 | ||
07903407 ON |
368 | if (retval) { |
369 | mutex_unlock(&list->thread_lock); | |
1da177e4 | 370 | return retval; |
07903407 | 371 | } |
1da177e4 LT |
372 | |
373 | ||
05f091ab | 374 | while (list->head != list->tail && |
1da177e4 LT |
375 | retval + event_size <= count) { |
376 | if ((list->flags & HIDDEV_FLAG_UREF) == 0) { | |
07903407 | 377 | if (list->buffer[list->tail].field_index != HID_FIELD_INDEX_NONE) { |
1da177e4 | 378 | struct hiddev_event event; |
07903407 | 379 | |
1da177e4 LT |
380 | event.hid = list->buffer[list->tail].usage_code; |
381 | event.value = list->buffer[list->tail].value; | |
07903407 ON |
382 | if (copy_to_user(buffer + retval, &event, sizeof(struct hiddev_event))) { |
383 | mutex_unlock(&list->thread_lock); | |
1da177e4 | 384 | return -EFAULT; |
07903407 | 385 | } |
1da177e4 LT |
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) { | |
07903407 ON |
391 | |
392 | if (copy_to_user(buffer + retval, list->buffer + list->tail, sizeof(struct hiddev_usage_ref))) { | |
393 | mutex_unlock(&list->thread_lock); | |
1da177e4 | 394 | return -EFAULT; |
07903407 | 395 | } |
1da177e4 LT |
396 | retval += sizeof(struct hiddev_usage_ref); |
397 | } | |
398 | } | |
399 | list->tail = (list->tail + 1) & (HIDDEV_BUFFER_SIZE - 1); | |
400 | } | |
401 | ||
402 | } | |
07903407 | 403 | mutex_unlock(&list->thread_lock); |
1da177e4 LT |
404 | |
405 | return retval; | |
406 | } | |
407 | ||
408 | /* | |
409 | * "poll" file op | |
410 | * No kernel lock - fine | |
411 | */ | |
afc9a42b | 412 | static __poll_t hiddev_poll(struct file *file, poll_table *wait) |
1da177e4 LT |
413 | { |
414 | struct hiddev_list *list = file->private_data; | |
826d5982 | 415 | |
1da177e4 LT |
416 | poll_wait(file, &list->hiddev->wait, wait); |
417 | if (list->head != list->tail) | |
c801aff1 | 418 | return EPOLLIN | EPOLLRDNORM | EPOLLOUT; |
1da177e4 | 419 | if (!list->hiddev->exist) |
a9a08845 | 420 | return EPOLLERR | EPOLLHUP; |
1da177e4 LT |
421 | return 0; |
422 | } | |
423 | ||
424 | /* | |
425 | * "ioctl" file op | |
426 | */ | |
cf2a299e JD |
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(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(uref_multi, user_arg, | |
443 | sizeof(*uref_multi))) | |
444 | goto fault; | |
445 | } else { | |
446 | if (copy_from_user(uref, user_arg, 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)) == NULL) | |
455 | goto inval; | |
456 | ||
457 | if (uref->field_index >= report->maxfield) | |
458 | goto inval; | |
4f65245f GS |
459 | uref->field_index = array_index_nospec(uref->field_index, |
460 | report->maxfield); | |
cf2a299e JD |
461 | |
462 | field = report->field[uref->field_index]; | |
463 | if (uref->usage_index >= field->maxusage) | |
464 | goto inval; | |
4f65245f GS |
465 | uref->usage_index = array_index_nospec(uref->usage_index, |
466 | field->maxusage); | |
cf2a299e JD |
467 | |
468 | uref->usage_code = field->usage[uref->usage_index].hid; | |
469 | ||
470 | if (copy_to_user(user_arg, uref, sizeof(*uref))) | |
471 | goto fault; | |
472 | ||
eb991089 | 473 | goto goodreturn; |
cf2a299e JD |
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)) == NULL) | |
489 | goto inval; | |
490 | ||
491 | if (uref->field_index >= report->maxfield) | |
492 | goto inval; | |
4f65245f GS |
493 | uref->field_index = array_index_nospec(uref->field_index, |
494 | report->maxfield); | |
cf2a299e JD |
495 | |
496 | field = report->field[uref->field_index]; | |
497 | ||
498 | if (cmd == HIDIOCGCOLLECTIONINDEX) { | |
499 | if (uref->usage_index >= field->maxusage) | |
500 | goto inval; | |
f1127439 BL |
501 | uref->usage_index = |
502 | array_index_nospec(uref->usage_index, | |
503 | field->maxusage); | |
cf2a299e JD |
504 | } else if (uref->usage_index >= field->report_count) |
505 | goto inval; | |
ac065bf2 | 506 | } |
cf2a299e | 507 | |
f1127439 BL |
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 | } | |
93a2001b | 519 | |
cf2a299e JD |
520 | switch (cmd) { |
521 | case HIDIOCGUSAGE: | |
25a097f5 PY |
522 | if (uref->usage_index >= field->report_count) |
523 | goto inval; | |
cf2a299e JD |
524 | uref->value = field->value[uref->usage_index]; |
525 | if (copy_to_user(user_arg, uref, sizeof(*uref))) | |
526 | goto fault; | |
527 | goto goodreturn; | |
528 | ||
529 | case HIDIOCSUSAGE: | |
25a097f5 PY |
530 | if (uref->usage_index >= field->report_count) |
531 | goto inval; | |
cf2a299e JD |
532 | field->value[uref->usage_index] = uref->value; |
533 | goto goodreturn; | |
534 | ||
535 | case HIDIOCGCOLLECTIONINDEX: | |
4859484b | 536 | i = field->usage[uref->usage_index].collection_index; |
cf2a299e | 537 | kfree(uref_multi); |
4859484b | 538 | return i; |
cf2a299e JD |
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(user_arg, uref_multi, | |
544 | 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(uref_multi); | |
556 | return 0; | |
557 | fault: | |
558 | kfree(uref_multi); | |
559 | return -EFAULT; | |
560 | inval: | |
561 | kfree(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, idx, buf, HID_STRING_SIZE-1)) < 0) { | |
580 | kfree(buf); | |
581 | return -EINVAL; | |
582 | } | |
583 | ||
584 | if (copy_to_user(user_arg+sizeof(int), buf, len+1)) { | |
585 | kfree(buf); | |
586 | return -EFAULT; | |
587 | } | |
588 | ||
589 | kfree(buf); | |
590 | ||
591 | return len; | |
592 | } | |
593 | ||
7961df16 | 594 | static long hiddev_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
1da177e4 LT |
595 | { |
596 | struct hiddev_list *list = file->private_data; | |
597 | struct hiddev *hiddev = list->hiddev; | |
1a8e8fab | 598 | struct hid_device *hid; |
1da177e4 LT |
599 | struct hiddev_collection_info cinfo; |
600 | struct hiddev_report_info rinfo; | |
601 | struct hiddev_field_info finfo; | |
1da177e4 LT |
602 | struct hiddev_devinfo dinfo; |
603 | struct hid_report *report; | |
604 | struct hid_field *field; | |
605 | void __user *user_arg = (void __user *)arg; | |
33d6eb57 | 606 | int i, r = -EINVAL; |
1a8e8fab | 607 | |
7961df16 | 608 | /* Called without BKL by compat methods so no BKL taken */ |
1da177e4 | 609 | |
33d6eb57 VB |
610 | mutex_lock(&hiddev->existancelock); |
611 | if (!hiddev->exist) { | |
612 | r = -ENODEV; | |
613 | goto ret_unlock; | |
614 | } | |
615 | ||
616 | hid = hiddev->hid; | |
1da177e4 LT |
617 | |
618 | switch (cmd) { | |
619 | ||
620 | case HIDIOCGVERSION: | |
33d6eb57 VB |
621 | r = put_user(HID_VERSION, (int __user *)arg) ? |
622 | -EFAULT : 0; | |
623 | break; | |
1da177e4 LT |
624 | |
625 | case HIDIOCAPPLICATION: | |
d339f61d | 626 | if (arg >= hid->maxapplication) |
33d6eb57 | 627 | break; |
1da177e4 LT |
628 | |
629 | for (i = 0; i < hid->maxcollection; i++) | |
05f091ab | 630 | if (hid->collection[i].type == |
1da177e4 LT |
631 | HID_COLLECTION_APPLICATION && arg-- == 0) |
632 | break; | |
05f091ab | 633 | |
33d6eb57 | 634 | if (i < hid->maxcollection) |
1a8e8fab | 635 | r = hid->collection[i].usage; |
33d6eb57 | 636 | break; |
1da177e4 LT |
637 | |
638 | case HIDIOCGDEVINFO: | |
33d6eb57 VB |
639 | { |
640 | struct usb_device *dev = hid_to_usb_dev(hid); | |
641 | struct usbhid_device *usbhid = hid->driver_data; | |
642 | ||
9561f7fa DC |
643 | memset(&dinfo, 0, sizeof(dinfo)); |
644 | ||
33d6eb57 VB |
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(user_arg, &dinfo, sizeof(dinfo)) ? | |
655 | -EFAULT : 0; | |
656 | break; | |
1a8e8fab VB |
657 | } |
658 | ||
1da177e4 | 659 | case HIDIOCGFLAG: |
33d6eb57 VB |
660 | r = put_user(list->flags, (int __user *)arg) ? |
661 | -EFAULT : 0; | |
662 | break; | |
1da177e4 LT |
663 | |
664 | case HIDIOCSFLAG: | |
665 | { | |
666 | int newflags; | |
33d6eb57 VB |
667 | |
668 | if (get_user(newflags, (int __user *)arg)) { | |
669 | r = -EFAULT; | |
670 | break; | |
671 | } | |
1da177e4 LT |
672 | |
673 | if ((newflags & ~HIDDEV_FLAGS) != 0 || | |
674 | ((newflags & HIDDEV_FLAG_REPORT) != 0 && | |
675 | (newflags & HIDDEV_FLAG_UREF) == 0)) | |
33d6eb57 | 676 | break; |
1da177e4 LT |
677 | |
678 | list->flags = newflags; | |
679 | ||
33d6eb57 VB |
680 | r = 0; |
681 | break; | |
1da177e4 LT |
682 | } |
683 | ||
684 | case HIDIOCGSTRING: | |
33d6eb57 VB |
685 | r = hiddev_ioctl_string(hiddev, cmd, user_arg); |
686 | break; | |
1da177e4 LT |
687 | |
688 | case HIDIOCINITREPORT: | |
4916b3a5 | 689 | usbhid_init_reports(hid); |
9143059f | 690 | hiddev->initialized = true; |
33d6eb57 VB |
691 | r = 0; |
692 | break; | |
1da177e4 LT |
693 | |
694 | case HIDIOCGREPORT: | |
33d6eb57 VB |
695 | if (copy_from_user(&rinfo, user_arg, sizeof(rinfo))) { |
696 | r = -EFAULT; | |
697 | break; | |
698 | } | |
1da177e4 LT |
699 | |
700 | if (rinfo.report_type == HID_REPORT_TYPE_OUTPUT) | |
33d6eb57 | 701 | break; |
1a8e8fab | 702 | |
1a8e8fab | 703 | report = hiddev_lookup_report(hid, &rinfo); |
33d6eb57 VB |
704 | if (report == NULL) |
705 | break; | |
1a8e8fab | 706 | |
d8814272 | 707 | hid_hw_request(hid, report, HID_REQ_GET_REPORT); |
b7966a4d | 708 | hid_hw_wait(hid); |
1da177e4 | 709 | |
33d6eb57 VB |
710 | r = 0; |
711 | break; | |
1da177e4 LT |
712 | |
713 | case HIDIOCSREPORT: | |
33d6eb57 VB |
714 | if (copy_from_user(&rinfo, user_arg, sizeof(rinfo))) { |
715 | r = -EFAULT; | |
716 | break; | |
717 | } | |
1da177e4 LT |
718 | |
719 | if (rinfo.report_type == HID_REPORT_TYPE_INPUT) | |
33d6eb57 | 720 | break; |
1a8e8fab | 721 | |
1a8e8fab | 722 | report = hiddev_lookup_report(hid, &rinfo); |
33d6eb57 VB |
723 | if (report == NULL) |
724 | break; | |
1a8e8fab | 725 | |
d8814272 | 726 | hid_hw_request(hid, report, HID_REQ_SET_REPORT); |
b7966a4d | 727 | hid_hw_wait(hid); |
1da177e4 | 728 | |
33d6eb57 VB |
729 | r = 0; |
730 | break; | |
1da177e4 LT |
731 | |
732 | case HIDIOCGREPORTINFO: | |
33d6eb57 VB |
733 | if (copy_from_user(&rinfo, user_arg, sizeof(rinfo))) { |
734 | r = -EFAULT; | |
735 | break; | |
1a8e8fab VB |
736 | } |
737 | ||
1a8e8fab | 738 | report = hiddev_lookup_report(hid, &rinfo); |
33d6eb57 VB |
739 | if (report == NULL) |
740 | break; | |
1da177e4 LT |
741 | |
742 | rinfo.num_fields = report->maxfield; | |
1da177e4 | 743 | |
33d6eb57 VB |
744 | r = copy_to_user(user_arg, &rinfo, sizeof(rinfo)) ? |
745 | -EFAULT : 0; | |
746 | break; | |
1da177e4 LT |
747 | |
748 | case HIDIOCGFIELDINFO: | |
33d6eb57 VB |
749 | if (copy_from_user(&finfo, user_arg, sizeof(finfo))) { |
750 | r = -EFAULT; | |
751 | break; | |
752 | } | |
753 | ||
1da177e4 LT |
754 | rinfo.report_type = finfo.report_type; |
755 | rinfo.report_id = finfo.report_id; | |
1da177e4 | 756 | |
1a8e8fab | 757 | report = hiddev_lookup_report(hid, &rinfo); |
33d6eb57 VB |
758 | if (report == NULL) |
759 | break; | |
1a8e8fab | 760 | |
33d6eb57 VB |
761 | if (finfo.field_index >= report->maxfield) |
762 | break; | |
4f65245f GS |
763 | finfo.field_index = array_index_nospec(finfo.field_index, |
764 | report->maxfield); | |
1da177e4 LT |
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; | |
1da177e4 | 782 | |
33d6eb57 VB |
783 | r = copy_to_user(user_arg, &finfo, sizeof(finfo)) ? |
784 | -EFAULT : 0; | |
785 | break; | |
1da177e4 LT |
786 | |
787 | case HIDIOCGUCODE: | |
1da177e4 LT |
788 | case HIDIOCGUSAGE: |
789 | case HIDIOCSUSAGE: | |
790 | case HIDIOCGUSAGES: | |
791 | case HIDIOCSUSAGES: | |
792 | case HIDIOCGCOLLECTIONINDEX: | |
9143059f BT |
793 | if (!hiddev->initialized) { |
794 | usbhid_init_reports(hid); | |
795 | hiddev->initialized = true; | |
796 | } | |
33d6eb57 VB |
797 | r = hiddev_ioctl_usage(hiddev, cmd, user_arg); |
798 | break; | |
1da177e4 LT |
799 | |
800 | case HIDIOCGCOLLECTIONINFO: | |
33d6eb57 VB |
801 | if (copy_from_user(&cinfo, user_arg, sizeof(cinfo))) { |
802 | r = -EFAULT; | |
803 | break; | |
1a8e8fab VB |
804 | } |
805 | ||
33d6eb57 VB |
806 | if (cinfo.index >= hid->maxcollection) |
807 | break; | |
4f65245f GS |
808 | cinfo.index = array_index_nospec(cinfo.index, |
809 | hid->maxcollection); | |
1da177e4 LT |
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 | ||
33d6eb57 VB |
815 | r = copy_to_user(user_arg, &cinfo, sizeof(cinfo)) ? |
816 | -EFAULT : 0; | |
817 | break; | |
1da177e4 LT |
818 | |
819 | default: | |
1da177e4 | 820 | if (_IOC_TYPE(cmd) != 'H' || _IOC_DIR(cmd) != _IOC_READ) |
33d6eb57 | 821 | break; |
1da177e4 LT |
822 | |
823 | if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGNAME(0))) { | |
dd2ed487 | 824 | int len = strlen(hid->name) + 1; |
1da177e4 LT |
825 | if (len > _IOC_SIZE(cmd)) |
826 | len = _IOC_SIZE(cmd); | |
1a8e8fab | 827 | r = copy_to_user(user_arg, hid->name, len) ? |
1da177e4 | 828 | -EFAULT : len; |
33d6eb57 | 829 | break; |
1da177e4 LT |
830 | } |
831 | ||
832 | if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGPHYS(0))) { | |
dd2ed487 | 833 | int len = strlen(hid->phys) + 1; |
1da177e4 LT |
834 | if (len > _IOC_SIZE(cmd)) |
835 | len = _IOC_SIZE(cmd); | |
1a8e8fab | 836 | r = copy_to_user(user_arg, hid->phys, len) ? |
1da177e4 | 837 | -EFAULT : len; |
33d6eb57 | 838 | break; |
1da177e4 LT |
839 | } |
840 | } | |
33d6eb57 VB |
841 | |
842 | ret_unlock: | |
843 | mutex_unlock(&hiddev->existancelock); | |
844 | return r; | |
1da177e4 LT |
845 | } |
846 | ||
066202dd | 847 | static const struct file_operations hiddev_fops = { |
1da177e4 LT |
848 | .owner = THIS_MODULE, |
849 | .read = hiddev_read, | |
850 | .write = hiddev_write, | |
851 | .poll = hiddev_poll, | |
852 | .open = hiddev_open, | |
853 | .release = hiddev_release, | |
7961df16 | 854 | .unlocked_ioctl = hiddev_ioctl, |
1da177e4 | 855 | .fasync = hiddev_fasync, |
407e9ef7 | 856 | .compat_ioctl = compat_ptr_ioctl, |
6038f373 | 857 | .llseek = noop_llseek, |
1da177e4 LT |
858 | }; |
859 | ||
2c9ede55 | 860 | static char *hiddev_devnode(struct device *dev, umode_t *mode) |
f7a386c5 KS |
861 | { |
862 | return kasprintf(GFP_KERNEL, "usb/%s", dev_name(dev)); | |
863 | } | |
864 | ||
1da177e4 | 865 | static struct usb_class_driver hiddev_class = { |
d6e5bcf4 | 866 | .name = "hiddev%d", |
e454cea2 | 867 | .devnode = hiddev_devnode, |
1da177e4 | 868 | .fops = &hiddev_fops, |
05f091ab | 869 | .minor_base = HIDDEV_MINOR_BASE, |
1da177e4 LT |
870 | }; |
871 | ||
872 | /* | |
873 | * This is where hid.c calls us to connect a hid device to the hiddev driver | |
874 | */ | |
93c10132 | 875 | int hiddev_connect(struct hid_device *hid, unsigned int force) |
1da177e4 LT |
876 | { |
877 | struct hiddev *hiddev; | |
4916b3a5 | 878 | struct usbhid_device *usbhid = hid->driver_data; |
1da177e4 LT |
879 | int retval; |
880 | ||
93c10132 JS |
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; | |
1da177e4 | 888 | |
93c10132 | 889 | if (i == hid->maxcollection) |
9951bb25 | 890 | return -EINVAL; |
93c10132 | 891 | } |
1da177e4 | 892 | |
bbdb7daf | 893 | if (!(hiddev = kzalloc(sizeof(struct hiddev), GFP_KERNEL))) |
9951bb25 | 894 | return -ENOMEM; |
1da177e4 | 895 | |
1da177e4 | 896 | init_waitqueue_head(&hiddev->wait); |
826d5982 | 897 | INIT_LIST_HEAD(&hiddev->list); |
cdcb44e8 | 898 | spin_lock_init(&hiddev->list_lock); |
07903407 | 899 | mutex_init(&hiddev->existancelock); |
76052749 | 900 | hid->hiddev = hiddev; |
1da177e4 LT |
901 | hiddev->hid = hid; |
902 | hiddev->exist = 1; | |
07903407 ON |
903 | retval = usb_register_dev(usbhid->intf, &hiddev_class); |
904 | if (retval) { | |
4291ee30 | 905 | hid_err(hid, "Not able to get a minor for this device\n"); |
76052749 | 906 | hid->hiddev = NULL; |
07903407 | 907 | kfree(hiddev); |
9951bb25 | 908 | return retval; |
07903407 | 909 | } |
9143059f BT |
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 | ||
733aca90 JK |
917 | hiddev->minor = usbhid->intf->minor; |
918 | ||
1da177e4 LT |
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; | |
4916b3a5 | 930 | struct usbhid_device *usbhid = hid->driver_data; |
1da177e4 | 931 | |
ba18311d ML |
932 | usb_deregister_dev(usbhid->intf, &hiddev_class); |
933 | ||
07903407 | 934 | mutex_lock(&hiddev->existancelock); |
1da177e4 LT |
935 | hiddev->exist = 0; |
936 | ||
1da177e4 | 937 | if (hiddev->open) { |
d36b7d4c | 938 | hid_hw_close(hiddev->hid); |
1da177e4 | 939 | wake_up_interruptible(&hiddev->wait); |
5c02c447 | 940 | mutex_unlock(&hiddev->existancelock); |
1da177e4 | 941 | } else { |
7f77897e | 942 | mutex_unlock(&hiddev->existancelock); |
1da177e4 LT |
943 | kfree(hiddev); |
944 | } | |
945 | } |