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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Copyright (c) 2001 Paul Stewart | |
3 | * Copyright (c) 2001 Vojtech Pavlik | |
4 | * | |
5 | * HID char devices, giving access to raw HID device events. | |
6 | * | |
7 | */ | |
8 | ||
9 | /* | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 2 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | * GNU General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License | |
21 | * along with this program; if not, write to the Free Software | |
22 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
23 | * | |
24 | * Should you need to contact me, the author, you can do so either by | |
25 | * e-mail - mail your message to Paul Stewart <stewart@wetlogic.net> | |
26 | */ | |
27 | ||
1da177e4 LT |
28 | #include <linux/poll.h> |
29 | #include <linux/slab.h> | |
174cd4b1 | 30 | #include <linux/sched/signal.h> |
1da177e4 LT |
31 | #include <linux/module.h> |
32 | #include <linux/init.h> | |
1da177e4 LT |
33 | #include <linux/input.h> |
34 | #include <linux/usb.h> | |
dde5845a | 35 | #include <linux/hid.h> |
1da177e4 | 36 | #include <linux/hiddev.h> |
bb6c8d8f | 37 | #include <linux/compat.h> |
d4f0e4da | 38 | #include <linux/vmalloc.h> |
dde5845a | 39 | #include "usbhid.h" |
1da177e4 LT |
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 | |
affbb8c6 | 48 | #define HIDDEV_BUFFER_SIZE 2048 |
1da177e4 | 49 | |
1da177e4 LT |
50 | struct hiddev_list { |
51 | struct hiddev_usage_ref buffer[HIDDEV_BUFFER_SIZE]; | |
52 | int head; | |
53 | int tail; | |
54 | unsigned flags; | |
55 | struct fasync_struct *fasync; | |
56 | struct hiddev *hiddev; | |
826d5982 | 57 | struct list_head node; |
07903407 | 58 | struct mutex thread_lock; |
1da177e4 LT |
59 | }; |
60 | ||
1da177e4 LT |
61 | /* |
62 | * Find a report, given the report's type and ID. The ID can be specified | |
63 | * indirectly by REPORT_ID_FIRST (which returns the first report of the given | |
64 | * type) or by (REPORT_ID_NEXT | old_id), which returns the next report of the | |
65 | * given type which follows old_id. | |
66 | */ | |
67 | static struct hid_report * | |
68 | hiddev_lookup_report(struct hid_device *hid, struct hiddev_report_info *rinfo) | |
69 | { | |
826d5982 DT |
70 | unsigned int flags = rinfo->report_id & ~HID_REPORT_ID_MASK; |
71 | unsigned int rid = rinfo->report_id & HID_REPORT_ID_MASK; | |
1da177e4 | 72 | struct hid_report_enum *report_enum; |
826d5982 | 73 | struct hid_report *report; |
1da177e4 LT |
74 | struct list_head *list; |
75 | ||
76 | if (rinfo->report_type < HID_REPORT_TYPE_MIN || | |
826d5982 DT |
77 | rinfo->report_type > HID_REPORT_TYPE_MAX) |
78 | return NULL; | |
1da177e4 LT |
79 | |
80 | report_enum = hid->report_enum + | |
81 | (rinfo->report_type - HID_REPORT_TYPE_MIN); | |
82 | ||
83 | switch (flags) { | |
84 | case 0: /* Nothing to do -- report_id is already set correctly */ | |
85 | break; | |
86 | ||
87 | case HID_REPORT_ID_FIRST: | |
826d5982 | 88 | if (list_empty(&report_enum->report_list)) |
1da177e4 | 89 | return NULL; |
826d5982 DT |
90 | |
91 | list = report_enum->report_list.next; | |
92 | report = list_entry(list, struct hid_report, list); | |
93 | rinfo->report_id = report->id; | |
1da177e4 | 94 | break; |
05f091ab | 95 | |
1da177e4 | 96 | case HID_REPORT_ID_NEXT: |
826d5982 DT |
97 | report = report_enum->report_id_hash[rid]; |
98 | if (!report) | |
1da177e4 | 99 | return NULL; |
826d5982 DT |
100 | |
101 | list = report->list.next; | |
1da177e4 LT |
102 | if (list == &report_enum->report_list) |
103 | return NULL; | |
826d5982 DT |
104 | |
105 | report = list_entry(list, struct hid_report, list); | |
106 | rinfo->report_id = report->id; | |
1da177e4 | 107 | break; |
05f091ab | 108 | |
1da177e4 LT |
109 | default: |
110 | return NULL; | |
111 | } | |
112 | ||
113 | return report_enum->report_id_hash[rinfo->report_id]; | |
114 | } | |
115 | ||
116 | /* | |
117 | * Perform an exhaustive search of the report table for a usage, given its | |
118 | * type and usage id. | |
119 | */ | |
120 | static struct hid_field * | |
121 | hiddev_lookup_usage(struct hid_device *hid, struct hiddev_usage_ref *uref) | |
122 | { | |
123 | int i, j; | |
124 | struct hid_report *report; | |
125 | struct hid_report_enum *report_enum; | |
126 | struct hid_field *field; | |
127 | ||
128 | if (uref->report_type < HID_REPORT_TYPE_MIN || | |
826d5982 DT |
129 | uref->report_type > HID_REPORT_TYPE_MAX) |
130 | return NULL; | |
1da177e4 LT |
131 | |
132 | report_enum = hid->report_enum + | |
133 | (uref->report_type - HID_REPORT_TYPE_MIN); | |
134 | ||
826d5982 | 135 | list_for_each_entry(report, &report_enum->report_list, list) { |
1da177e4 LT |
136 | for (i = 0; i < report->maxfield; i++) { |
137 | field = report->field[i]; | |
138 | for (j = 0; j < field->maxusage; j++) { | |
139 | if (field->usage[j].hid == uref->usage_code) { | |
140 | uref->report_id = report->id; | |
141 | uref->field_index = i; | |
142 | uref->usage_index = j; | |
143 | return field; | |
144 | } | |
145 | } | |
146 | } | |
826d5982 | 147 | } |
1da177e4 LT |
148 | |
149 | return NULL; | |
150 | } | |
151 | ||
152 | static void hiddev_send_event(struct hid_device *hid, | |
153 | struct hiddev_usage_ref *uref) | |
154 | { | |
155 | struct hiddev *hiddev = hid->hiddev; | |
826d5982 | 156 | struct hiddev_list *list; |
cdcb44e8 | 157 | unsigned long flags; |
1da177e4 | 158 | |
cdcb44e8 | 159 | spin_lock_irqsave(&hiddev->list_lock, flags); |
826d5982 | 160 | list_for_each_entry(list, &hiddev->list, node) { |
1da177e4 LT |
161 | if (uref->field_index != HID_FIELD_INDEX_NONE || |
162 | (list->flags & HIDDEV_FLAG_REPORT) != 0) { | |
163 | list->buffer[list->head] = *uref; | |
05f091ab | 164 | list->head = (list->head + 1) & |
1da177e4 LT |
165 | (HIDDEV_BUFFER_SIZE - 1); |
166 | kill_fasync(&list->fasync, SIGIO, POLL_IN); | |
167 | } | |
1da177e4 | 168 | } |
cdcb44e8 | 169 | spin_unlock_irqrestore(&hiddev->list_lock, flags); |
1da177e4 LT |
170 | |
171 | wake_up_interruptible(&hiddev->wait); | |
172 | } | |
173 | ||
174 | /* | |
175 | * This is where hid.c calls into hiddev to pass an event that occurred over | |
176 | * the interrupt pipe | |
177 | */ | |
178 | void hiddev_hid_event(struct hid_device *hid, struct hid_field *field, | |
7d12e780 | 179 | struct hid_usage *usage, __s32 value) |
1da177e4 LT |
180 | { |
181 | unsigned type = field->report_type; | |
182 | struct hiddev_usage_ref uref; | |
183 | ||
05f091ab | 184 | uref.report_type = |
1da177e4 | 185 | (type == HID_INPUT_REPORT) ? HID_REPORT_TYPE_INPUT : |
05f091ab | 186 | ((type == HID_OUTPUT_REPORT) ? HID_REPORT_TYPE_OUTPUT : |
826d5982 | 187 | ((type == HID_FEATURE_REPORT) ? HID_REPORT_TYPE_FEATURE : 0)); |
1da177e4 LT |
188 | uref.report_id = field->report->id; |
189 | uref.field_index = field->index; | |
190 | uref.usage_index = (usage - field->usage); | |
191 | uref.usage_code = usage->hid; | |
192 | uref.value = value; | |
193 | ||
194 | hiddev_send_event(hid, &uref); | |
195 | } | |
229695e5 | 196 | EXPORT_SYMBOL_GPL(hiddev_hid_event); |
1da177e4 LT |
197 | |
198 | void hiddev_report_event(struct hid_device *hid, struct hid_report *report) | |
199 | { | |
200 | unsigned type = report->type; | |
201 | struct hiddev_usage_ref uref; | |
202 | ||
203 | memset(&uref, 0, sizeof(uref)); | |
05f091ab | 204 | uref.report_type = |
1da177e4 | 205 | (type == HID_INPUT_REPORT) ? HID_REPORT_TYPE_INPUT : |
05f091ab | 206 | ((type == HID_OUTPUT_REPORT) ? HID_REPORT_TYPE_OUTPUT : |
826d5982 | 207 | ((type == HID_FEATURE_REPORT) ? HID_REPORT_TYPE_FEATURE : 0)); |
1da177e4 LT |
208 | uref.report_id = report->id; |
209 | uref.field_index = HID_FIELD_INDEX_NONE; | |
210 | ||
211 | hiddev_send_event(hid, &uref); | |
212 | } | |
aa8de2f0 | 213 | |
1da177e4 LT |
214 | /* |
215 | * fasync file op | |
216 | */ | |
217 | static int hiddev_fasync(int fd, struct file *file, int on) | |
218 | { | |
1da177e4 | 219 | struct hiddev_list *list = file->private_data; |
826d5982 | 220 | |
60aa4924 | 221 | return fasync_helper(fd, file, on, &list->fasync); |
1da177e4 LT |
222 | } |
223 | ||
224 | ||
225 | /* | |
226 | * release file op | |
227 | */ | |
228 | static int hiddev_release(struct inode * inode, struct file * file) | |
229 | { | |
230 | struct hiddev_list *list = file->private_data; | |
cdcb44e8 | 231 | unsigned long flags; |
1da177e4 | 232 | |
cdcb44e8 | 233 | spin_lock_irqsave(&list->hiddev->list_lock, flags); |
826d5982 | 234 | list_del(&list->node); |
cdcb44e8 | 235 | spin_unlock_irqrestore(&list->hiddev->list_lock, flags); |
1da177e4 | 236 | |
6cb4b040 | 237 | mutex_lock(&list->hiddev->existancelock); |
1da177e4 | 238 | if (!--list->hiddev->open) { |
0361a28d | 239 | if (list->hiddev->exist) { |
d36b7d4c | 240 | hid_hw_close(list->hiddev->hid); |
9a83563f | 241 | hid_hw_power(list->hiddev->hid, PM_HINT_NORMAL); |
0361a28d | 242 | } else { |
5c699d7d | 243 | mutex_unlock(&list->hiddev->existancelock); |
1da177e4 | 244 | kfree(list->hiddev); |
d4f0e4da | 245 | vfree(list); |
5c699d7d | 246 | return 0; |
0361a28d | 247 | } |
1da177e4 LT |
248 | } |
249 | ||
6cb4b040 | 250 | mutex_unlock(&list->hiddev->existancelock); |
d4f0e4da | 251 | vfree(list); |
1da177e4 LT |
252 | |
253 | return 0; | |
254 | } | |
255 | ||
256 | /* | |
257 | * open file op | |
258 | */ | |
826d5982 DT |
259 | static int hiddev_open(struct inode *inode, struct file *file) |
260 | { | |
1da177e4 | 261 | struct hiddev_list *list; |
bd25f4dd | 262 | struct usb_interface *intf; |
9c9e54a8 | 263 | struct hid_device *hid; |
bd25f4dd AB |
264 | struct hiddev *hiddev; |
265 | int res; | |
1da177e4 | 266 | |
8fe294ca | 267 | intf = usbhid_find_interface(iminor(inode)); |
bd25f4dd | 268 | if (!intf) |
1da177e4 | 269 | return -ENODEV; |
9c9e54a8 JK |
270 | hid = usb_get_intfdata(intf); |
271 | hiddev = hid->hiddev; | |
1da177e4 | 272 | |
d4f0e4da | 273 | if (!(list = vzalloc(sizeof(struct hiddev_list)))) |
1da177e4 | 274 | return -ENOMEM; |
07903407 | 275 | mutex_init(&list->thread_lock); |
bd25f4dd | 276 | list->hiddev = hiddev; |
1da177e4 LT |
277 | file->private_data = list; |
278 | ||
07903407 ON |
279 | /* |
280 | * no need for locking because the USB major number | |
281 | * is shared which usbcore guards against disconnect | |
282 | */ | |
283 | if (list->hiddev->exist) { | |
284 | if (!list->hiddev->open++) { | |
d36b7d4c DT |
285 | res = hid_hw_open(hiddev->hid); |
286 | if (res < 0) | |
07903407 | 287 | goto bail; |
07903407 ON |
288 | } |
289 | } else { | |
290 | res = -ENODEV; | |
291 | goto bail; | |
292 | } | |
293 | ||
294 | spin_lock_irq(&list->hiddev->list_lock); | |
bd25f4dd | 295 | list_add_tail(&list->node, &hiddev->list); |
07903407 | 296 | spin_unlock_irq(&list->hiddev->list_lock); |
1da177e4 | 297 | |
6cb4b040 | 298 | mutex_lock(&hiddev->existancelock); |
0361a28d ON |
299 | if (!list->hiddev->open++) |
300 | if (list->hiddev->exist) { | |
bd25f4dd | 301 | struct hid_device *hid = hiddev->hid; |
9a83563f DT |
302 | res = hid_hw_power(hid, PM_HINT_FULLON); |
303 | if (res < 0) | |
6cb4b040 | 304 | goto bail_unlock; |
d36b7d4c DT |
305 | res = hid_hw_open(hid); |
306 | if (res < 0) | |
9a83563f | 307 | goto bail_normal_power; |
0361a28d | 308 | } |
6cb4b040 | 309 | mutex_unlock(&hiddev->existancelock); |
1da177e4 | 310 | return 0; |
9a83563f DT |
311 | bail_normal_power: |
312 | hid_hw_power(hid, PM_HINT_NORMAL); | |
6cb4b040 JK |
313 | bail_unlock: |
314 | mutex_unlock(&hiddev->existancelock); | |
07903407 ON |
315 | bail: |
316 | file->private_data = NULL; | |
d4f0e4da | 317 | vfree(list); |
07903407 | 318 | return res; |
1da177e4 LT |
319 | } |
320 | ||
321 | /* | |
322 | * "write" file op | |
323 | */ | |
324 | static ssize_t hiddev_write(struct file * file, const char __user * buffer, size_t count, loff_t *ppos) | |
325 | { | |
326 | return -EINVAL; | |
327 | } | |
328 | ||
329 | /* | |
330 | * "read" file op | |
331 | */ | |
332 | static ssize_t hiddev_read(struct file * file, char __user * buffer, size_t count, loff_t *ppos) | |
333 | { | |
96fe2ab8 | 334 | DEFINE_WAIT(wait); |
1da177e4 LT |
335 | struct hiddev_list *list = file->private_data; |
336 | int event_size; | |
07903407 | 337 | int retval; |
1da177e4 LT |
338 | |
339 | event_size = ((list->flags & HIDDEV_FLAG_UREF) != 0) ? | |
340 | sizeof(struct hiddev_usage_ref) : sizeof(struct hiddev_event); | |
341 | ||
342 | if (count < event_size) | |
343 | return 0; | |
344 | ||
07903407 ON |
345 | /* lock against other threads */ |
346 | retval = mutex_lock_interruptible(&list->thread_lock); | |
347 | if (retval) | |
348 | return -ERESTARTSYS; | |
349 | ||
1da177e4 LT |
350 | while (retval == 0) { |
351 | if (list->head == list->tail) { | |
07903407 | 352 | prepare_to_wait(&list->hiddev->wait, &wait, TASK_INTERRUPTIBLE); |
05f091ab | 353 | |
1da177e4 | 354 | while (list->head == list->tail) { |
1da177e4 LT |
355 | if (signal_pending(current)) { |
356 | retval = -ERESTARTSYS; | |
357 | break; | |
358 | } | |
359 | if (!list->hiddev->exist) { | |
360 | retval = -EIO; | |
361 | break; | |
362 | } | |
13f19624 JK |
363 | if (file->f_flags & O_NONBLOCK) { |
364 | retval = -EAGAIN; | |
365 | break; | |
366 | } | |
05f091ab | 367 | |
07903407 ON |
368 | /* let O_NONBLOCK tasks run */ |
369 | mutex_unlock(&list->thread_lock); | |
1da177e4 | 370 | schedule(); |
06268b2a PW |
371 | if (mutex_lock_interruptible(&list->thread_lock)) { |
372 | finish_wait(&list->hiddev->wait, &wait); | |
07903407 | 373 | return -EINTR; |
06268b2a | 374 | } |
48d70552 | 375 | set_current_state(TASK_INTERRUPTIBLE); |
1da177e4 | 376 | } |
07903407 | 377 | finish_wait(&list->hiddev->wait, &wait); |
1da177e4 | 378 | |
1da177e4 LT |
379 | } |
380 | ||
07903407 ON |
381 | if (retval) { |
382 | mutex_unlock(&list->thread_lock); | |
1da177e4 | 383 | return retval; |
07903407 | 384 | } |
1da177e4 LT |
385 | |
386 | ||
05f091ab | 387 | while (list->head != list->tail && |
1da177e4 LT |
388 | retval + event_size <= count) { |
389 | if ((list->flags & HIDDEV_FLAG_UREF) == 0) { | |
07903407 | 390 | if (list->buffer[list->tail].field_index != HID_FIELD_INDEX_NONE) { |
1da177e4 | 391 | struct hiddev_event event; |
07903407 | 392 | |
1da177e4 LT |
393 | event.hid = list->buffer[list->tail].usage_code; |
394 | event.value = list->buffer[list->tail].value; | |
07903407 ON |
395 | if (copy_to_user(buffer + retval, &event, sizeof(struct hiddev_event))) { |
396 | mutex_unlock(&list->thread_lock); | |
1da177e4 | 397 | return -EFAULT; |
07903407 | 398 | } |
1da177e4 LT |
399 | retval += sizeof(struct hiddev_event); |
400 | } | |
401 | } else { | |
402 | if (list->buffer[list->tail].field_index != HID_FIELD_INDEX_NONE || | |
403 | (list->flags & HIDDEV_FLAG_REPORT) != 0) { | |
07903407 ON |
404 | |
405 | if (copy_to_user(buffer + retval, list->buffer + list->tail, sizeof(struct hiddev_usage_ref))) { | |
406 | mutex_unlock(&list->thread_lock); | |
1da177e4 | 407 | return -EFAULT; |
07903407 | 408 | } |
1da177e4 LT |
409 | retval += sizeof(struct hiddev_usage_ref); |
410 | } | |
411 | } | |
412 | list->tail = (list->tail + 1) & (HIDDEV_BUFFER_SIZE - 1); | |
413 | } | |
414 | ||
415 | } | |
07903407 | 416 | mutex_unlock(&list->thread_lock); |
1da177e4 LT |
417 | |
418 | return retval; | |
419 | } | |
420 | ||
421 | /* | |
422 | * "poll" file op | |
423 | * No kernel lock - fine | |
424 | */ | |
afc9a42b | 425 | static __poll_t hiddev_poll(struct file *file, poll_table *wait) |
1da177e4 LT |
426 | { |
427 | struct hiddev_list *list = file->private_data; | |
826d5982 | 428 | |
1da177e4 LT |
429 | poll_wait(file, &list->hiddev->wait, wait); |
430 | if (list->head != list->tail) | |
431 | return POLLIN | POLLRDNORM; | |
432 | if (!list->hiddev->exist) | |
433 | return POLLERR | POLLHUP; | |
434 | return 0; | |
435 | } | |
436 | ||
437 | /* | |
438 | * "ioctl" file op | |
439 | */ | |
cf2a299e JD |
440 | static noinline int hiddev_ioctl_usage(struct hiddev *hiddev, unsigned int cmd, void __user *user_arg) |
441 | { | |
442 | struct hid_device *hid = hiddev->hid; | |
443 | struct hiddev_report_info rinfo; | |
444 | struct hiddev_usage_ref_multi *uref_multi = NULL; | |
445 | struct hiddev_usage_ref *uref; | |
446 | struct hid_report *report; | |
447 | struct hid_field *field; | |
448 | int i; | |
449 | ||
450 | uref_multi = kmalloc(sizeof(struct hiddev_usage_ref_multi), GFP_KERNEL); | |
451 | if (!uref_multi) | |
452 | return -ENOMEM; | |
453 | uref = &uref_multi->uref; | |
454 | if (cmd == HIDIOCGUSAGES || cmd == HIDIOCSUSAGES) { | |
455 | if (copy_from_user(uref_multi, user_arg, | |
456 | sizeof(*uref_multi))) | |
457 | goto fault; | |
458 | } else { | |
459 | if (copy_from_user(uref, user_arg, sizeof(*uref))) | |
460 | goto fault; | |
461 | } | |
462 | ||
463 | switch (cmd) { | |
464 | case HIDIOCGUCODE: | |
465 | rinfo.report_type = uref->report_type; | |
466 | rinfo.report_id = uref->report_id; | |
467 | if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL) | |
468 | goto inval; | |
469 | ||
470 | if (uref->field_index >= report->maxfield) | |
471 | goto inval; | |
472 | ||
473 | field = report->field[uref->field_index]; | |
474 | if (uref->usage_index >= field->maxusage) | |
475 | goto inval; | |
476 | ||
477 | uref->usage_code = field->usage[uref->usage_index].hid; | |
478 | ||
479 | if (copy_to_user(user_arg, uref, sizeof(*uref))) | |
480 | goto fault; | |
481 | ||
eb991089 | 482 | goto goodreturn; |
cf2a299e JD |
483 | |
484 | default: | |
485 | if (cmd != HIDIOCGUSAGE && | |
486 | cmd != HIDIOCGUSAGES && | |
487 | uref->report_type == HID_REPORT_TYPE_INPUT) | |
488 | goto inval; | |
489 | ||
490 | if (uref->report_id == HID_REPORT_ID_UNKNOWN) { | |
491 | field = hiddev_lookup_usage(hid, uref); | |
492 | if (field == NULL) | |
493 | goto inval; | |
494 | } else { | |
495 | rinfo.report_type = uref->report_type; | |
496 | rinfo.report_id = uref->report_id; | |
497 | if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL) | |
498 | goto inval; | |
499 | ||
500 | if (uref->field_index >= report->maxfield) | |
501 | goto inval; | |
502 | ||
503 | field = report->field[uref->field_index]; | |
504 | ||
505 | if (cmd == HIDIOCGCOLLECTIONINDEX) { | |
506 | if (uref->usage_index >= field->maxusage) | |
507 | goto inval; | |
508 | } else if (uref->usage_index >= field->report_count) | |
509 | goto inval; | |
ac065bf2 | 510 | } |
cf2a299e | 511 | |
93a2001b SB |
512 | if ((cmd == HIDIOCGUSAGES || cmd == HIDIOCSUSAGES) && |
513 | (uref_multi->num_values > HID_MAX_MULTI_USAGES || | |
514 | uref->usage_index + uref_multi->num_values > field->report_count)) | |
515 | goto inval; | |
516 | ||
cf2a299e JD |
517 | switch (cmd) { |
518 | case HIDIOCGUSAGE: | |
519 | uref->value = field->value[uref->usage_index]; | |
520 | if (copy_to_user(user_arg, uref, sizeof(*uref))) | |
521 | goto fault; | |
522 | goto goodreturn; | |
523 | ||
524 | case HIDIOCSUSAGE: | |
525 | field->value[uref->usage_index] = uref->value; | |
526 | goto goodreturn; | |
527 | ||
528 | case HIDIOCGCOLLECTIONINDEX: | |
4859484b | 529 | i = field->usage[uref->usage_index].collection_index; |
cf2a299e | 530 | kfree(uref_multi); |
4859484b | 531 | return i; |
cf2a299e JD |
532 | case HIDIOCGUSAGES: |
533 | for (i = 0; i < uref_multi->num_values; i++) | |
534 | uref_multi->values[i] = | |
535 | field->value[uref->usage_index + i]; | |
536 | if (copy_to_user(user_arg, uref_multi, | |
537 | sizeof(*uref_multi))) | |
538 | goto fault; | |
539 | goto goodreturn; | |
540 | case HIDIOCSUSAGES: | |
541 | for (i = 0; i < uref_multi->num_values; i++) | |
542 | field->value[uref->usage_index + i] = | |
543 | uref_multi->values[i]; | |
544 | goto goodreturn; | |
545 | } | |
546 | ||
547 | goodreturn: | |
548 | kfree(uref_multi); | |
549 | return 0; | |
550 | fault: | |
551 | kfree(uref_multi); | |
552 | return -EFAULT; | |
553 | inval: | |
554 | kfree(uref_multi); | |
555 | return -EINVAL; | |
556 | } | |
557 | } | |
558 | ||
559 | static noinline int hiddev_ioctl_string(struct hiddev *hiddev, unsigned int cmd, void __user *user_arg) | |
560 | { | |
561 | struct hid_device *hid = hiddev->hid; | |
562 | struct usb_device *dev = hid_to_usb_dev(hid); | |
563 | int idx, len; | |
564 | char *buf; | |
565 | ||
566 | if (get_user(idx, (int __user *)user_arg)) | |
567 | return -EFAULT; | |
568 | ||
569 | if ((buf = kmalloc(HID_STRING_SIZE, GFP_KERNEL)) == NULL) | |
570 | return -ENOMEM; | |
571 | ||
572 | if ((len = usb_string(dev, idx, buf, HID_STRING_SIZE-1)) < 0) { | |
573 | kfree(buf); | |
574 | return -EINVAL; | |
575 | } | |
576 | ||
577 | if (copy_to_user(user_arg+sizeof(int), buf, len+1)) { | |
578 | kfree(buf); | |
579 | return -EFAULT; | |
580 | } | |
581 | ||
582 | kfree(buf); | |
583 | ||
584 | return len; | |
585 | } | |
586 | ||
7961df16 | 587 | static long hiddev_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
1da177e4 LT |
588 | { |
589 | struct hiddev_list *list = file->private_data; | |
590 | struct hiddev *hiddev = list->hiddev; | |
1a8e8fab | 591 | struct hid_device *hid; |
1da177e4 LT |
592 | struct hiddev_collection_info cinfo; |
593 | struct hiddev_report_info rinfo; | |
594 | struct hiddev_field_info finfo; | |
1da177e4 LT |
595 | struct hiddev_devinfo dinfo; |
596 | struct hid_report *report; | |
597 | struct hid_field *field; | |
598 | void __user *user_arg = (void __user *)arg; | |
33d6eb57 | 599 | int i, r = -EINVAL; |
1a8e8fab | 600 | |
7961df16 | 601 | /* Called without BKL by compat methods so no BKL taken */ |
1da177e4 | 602 | |
33d6eb57 VB |
603 | mutex_lock(&hiddev->existancelock); |
604 | if (!hiddev->exist) { | |
605 | r = -ENODEV; | |
606 | goto ret_unlock; | |
607 | } | |
608 | ||
609 | hid = hiddev->hid; | |
1da177e4 LT |
610 | |
611 | switch (cmd) { | |
612 | ||
613 | case HIDIOCGVERSION: | |
33d6eb57 VB |
614 | r = put_user(HID_VERSION, (int __user *)arg) ? |
615 | -EFAULT : 0; | |
616 | break; | |
1da177e4 LT |
617 | |
618 | case HIDIOCAPPLICATION: | |
d339f61d | 619 | if (arg >= hid->maxapplication) |
33d6eb57 | 620 | break; |
1da177e4 LT |
621 | |
622 | for (i = 0; i < hid->maxcollection; i++) | |
05f091ab | 623 | if (hid->collection[i].type == |
1da177e4 LT |
624 | HID_COLLECTION_APPLICATION && arg-- == 0) |
625 | break; | |
05f091ab | 626 | |
33d6eb57 | 627 | if (i < hid->maxcollection) |
1a8e8fab | 628 | r = hid->collection[i].usage; |
33d6eb57 | 629 | break; |
1da177e4 LT |
630 | |
631 | case HIDIOCGDEVINFO: | |
33d6eb57 VB |
632 | { |
633 | struct usb_device *dev = hid_to_usb_dev(hid); | |
634 | struct usbhid_device *usbhid = hid->driver_data; | |
635 | ||
9561f7fa DC |
636 | memset(&dinfo, 0, sizeof(dinfo)); |
637 | ||
33d6eb57 VB |
638 | dinfo.bustype = BUS_USB; |
639 | dinfo.busnum = dev->bus->busnum; | |
640 | dinfo.devnum = dev->devnum; | |
641 | dinfo.ifnum = usbhid->ifnum; | |
642 | dinfo.vendor = le16_to_cpu(dev->descriptor.idVendor); | |
643 | dinfo.product = le16_to_cpu(dev->descriptor.idProduct); | |
644 | dinfo.version = le16_to_cpu(dev->descriptor.bcdDevice); | |
645 | dinfo.num_applications = hid->maxapplication; | |
646 | ||
647 | r = copy_to_user(user_arg, &dinfo, sizeof(dinfo)) ? | |
648 | -EFAULT : 0; | |
649 | break; | |
1a8e8fab VB |
650 | } |
651 | ||
1da177e4 | 652 | case HIDIOCGFLAG: |
33d6eb57 VB |
653 | r = put_user(list->flags, (int __user *)arg) ? |
654 | -EFAULT : 0; | |
655 | break; | |
1da177e4 LT |
656 | |
657 | case HIDIOCSFLAG: | |
658 | { | |
659 | int newflags; | |
33d6eb57 VB |
660 | |
661 | if (get_user(newflags, (int __user *)arg)) { | |
662 | r = -EFAULT; | |
663 | break; | |
664 | } | |
1da177e4 LT |
665 | |
666 | if ((newflags & ~HIDDEV_FLAGS) != 0 || | |
667 | ((newflags & HIDDEV_FLAG_REPORT) != 0 && | |
668 | (newflags & HIDDEV_FLAG_UREF) == 0)) | |
33d6eb57 | 669 | break; |
1da177e4 LT |
670 | |
671 | list->flags = newflags; | |
672 | ||
33d6eb57 VB |
673 | r = 0; |
674 | break; | |
1da177e4 LT |
675 | } |
676 | ||
677 | case HIDIOCGSTRING: | |
33d6eb57 VB |
678 | r = hiddev_ioctl_string(hiddev, cmd, user_arg); |
679 | break; | |
1da177e4 LT |
680 | |
681 | case HIDIOCINITREPORT: | |
4916b3a5 | 682 | usbhid_init_reports(hid); |
9143059f | 683 | hiddev->initialized = true; |
33d6eb57 VB |
684 | r = 0; |
685 | break; | |
1da177e4 LT |
686 | |
687 | case HIDIOCGREPORT: | |
33d6eb57 VB |
688 | if (copy_from_user(&rinfo, user_arg, sizeof(rinfo))) { |
689 | r = -EFAULT; | |
690 | break; | |
691 | } | |
1da177e4 LT |
692 | |
693 | if (rinfo.report_type == HID_REPORT_TYPE_OUTPUT) | |
33d6eb57 | 694 | break; |
1a8e8fab | 695 | |
1a8e8fab | 696 | report = hiddev_lookup_report(hid, &rinfo); |
33d6eb57 VB |
697 | if (report == NULL) |
698 | break; | |
1a8e8fab | 699 | |
d8814272 | 700 | hid_hw_request(hid, report, HID_REQ_GET_REPORT); |
b7966a4d | 701 | hid_hw_wait(hid); |
1da177e4 | 702 | |
33d6eb57 VB |
703 | r = 0; |
704 | break; | |
1da177e4 LT |
705 | |
706 | case HIDIOCSREPORT: | |
33d6eb57 VB |
707 | if (copy_from_user(&rinfo, user_arg, sizeof(rinfo))) { |
708 | r = -EFAULT; | |
709 | break; | |
710 | } | |
1da177e4 LT |
711 | |
712 | if (rinfo.report_type == HID_REPORT_TYPE_INPUT) | |
33d6eb57 | 713 | break; |
1a8e8fab | 714 | |
1a8e8fab | 715 | report = hiddev_lookup_report(hid, &rinfo); |
33d6eb57 VB |
716 | if (report == NULL) |
717 | break; | |
1a8e8fab | 718 | |
d8814272 | 719 | hid_hw_request(hid, report, HID_REQ_SET_REPORT); |
b7966a4d | 720 | hid_hw_wait(hid); |
1da177e4 | 721 | |
33d6eb57 VB |
722 | r = 0; |
723 | break; | |
1da177e4 LT |
724 | |
725 | case HIDIOCGREPORTINFO: | |
33d6eb57 VB |
726 | if (copy_from_user(&rinfo, user_arg, sizeof(rinfo))) { |
727 | r = -EFAULT; | |
728 | break; | |
1a8e8fab VB |
729 | } |
730 | ||
1a8e8fab | 731 | report = hiddev_lookup_report(hid, &rinfo); |
33d6eb57 VB |
732 | if (report == NULL) |
733 | break; | |
1da177e4 LT |
734 | |
735 | rinfo.num_fields = report->maxfield; | |
1da177e4 | 736 | |
33d6eb57 VB |
737 | r = copy_to_user(user_arg, &rinfo, sizeof(rinfo)) ? |
738 | -EFAULT : 0; | |
739 | break; | |
1da177e4 LT |
740 | |
741 | case HIDIOCGFIELDINFO: | |
33d6eb57 VB |
742 | if (copy_from_user(&finfo, user_arg, sizeof(finfo))) { |
743 | r = -EFAULT; | |
744 | break; | |
745 | } | |
746 | ||
1da177e4 LT |
747 | rinfo.report_type = finfo.report_type; |
748 | rinfo.report_id = finfo.report_id; | |
1da177e4 | 749 | |
1a8e8fab | 750 | report = hiddev_lookup_report(hid, &rinfo); |
33d6eb57 VB |
751 | if (report == NULL) |
752 | break; | |
1a8e8fab | 753 | |
33d6eb57 VB |
754 | if (finfo.field_index >= report->maxfield) |
755 | break; | |
1da177e4 LT |
756 | |
757 | field = report->field[finfo.field_index]; | |
758 | memset(&finfo, 0, sizeof(finfo)); | |
759 | finfo.report_type = rinfo.report_type; | |
760 | finfo.report_id = rinfo.report_id; | |
761 | finfo.field_index = field->report_count - 1; | |
762 | finfo.maxusage = field->maxusage; | |
763 | finfo.flags = field->flags; | |
764 | finfo.physical = field->physical; | |
765 | finfo.logical = field->logical; | |
766 | finfo.application = field->application; | |
767 | finfo.logical_minimum = field->logical_minimum; | |
768 | finfo.logical_maximum = field->logical_maximum; | |
769 | finfo.physical_minimum = field->physical_minimum; | |
770 | finfo.physical_maximum = field->physical_maximum; | |
771 | finfo.unit_exponent = field->unit_exponent; | |
772 | finfo.unit = field->unit; | |
1da177e4 | 773 | |
33d6eb57 VB |
774 | r = copy_to_user(user_arg, &finfo, sizeof(finfo)) ? |
775 | -EFAULT : 0; | |
776 | break; | |
1da177e4 LT |
777 | |
778 | case HIDIOCGUCODE: | |
cf2a299e | 779 | /* fall through */ |
1da177e4 LT |
780 | case HIDIOCGUSAGE: |
781 | case HIDIOCSUSAGE: | |
782 | case HIDIOCGUSAGES: | |
783 | case HIDIOCSUSAGES: | |
784 | case HIDIOCGCOLLECTIONINDEX: | |
9143059f BT |
785 | if (!hiddev->initialized) { |
786 | usbhid_init_reports(hid); | |
787 | hiddev->initialized = true; | |
788 | } | |
33d6eb57 VB |
789 | r = hiddev_ioctl_usage(hiddev, cmd, user_arg); |
790 | break; | |
1da177e4 LT |
791 | |
792 | case HIDIOCGCOLLECTIONINFO: | |
33d6eb57 VB |
793 | if (copy_from_user(&cinfo, user_arg, sizeof(cinfo))) { |
794 | r = -EFAULT; | |
795 | break; | |
1a8e8fab VB |
796 | } |
797 | ||
33d6eb57 VB |
798 | if (cinfo.index >= hid->maxcollection) |
799 | break; | |
1da177e4 LT |
800 | |
801 | cinfo.type = hid->collection[cinfo.index].type; | |
802 | cinfo.usage = hid->collection[cinfo.index].usage; | |
803 | cinfo.level = hid->collection[cinfo.index].level; | |
804 | ||
33d6eb57 VB |
805 | r = copy_to_user(user_arg, &cinfo, sizeof(cinfo)) ? |
806 | -EFAULT : 0; | |
807 | break; | |
1da177e4 LT |
808 | |
809 | default: | |
1da177e4 | 810 | if (_IOC_TYPE(cmd) != 'H' || _IOC_DIR(cmd) != _IOC_READ) |
33d6eb57 | 811 | break; |
1da177e4 LT |
812 | |
813 | if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGNAME(0))) { | |
dd2ed487 | 814 | int len = strlen(hid->name) + 1; |
1da177e4 LT |
815 | if (len > _IOC_SIZE(cmd)) |
816 | len = _IOC_SIZE(cmd); | |
1a8e8fab | 817 | r = copy_to_user(user_arg, hid->name, len) ? |
1da177e4 | 818 | -EFAULT : len; |
33d6eb57 | 819 | break; |
1da177e4 LT |
820 | } |
821 | ||
822 | if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGPHYS(0))) { | |
dd2ed487 | 823 | int len = strlen(hid->phys) + 1; |
1da177e4 LT |
824 | if (len > _IOC_SIZE(cmd)) |
825 | len = _IOC_SIZE(cmd); | |
1a8e8fab | 826 | r = copy_to_user(user_arg, hid->phys, len) ? |
1da177e4 | 827 | -EFAULT : len; |
33d6eb57 | 828 | break; |
1da177e4 LT |
829 | } |
830 | } | |
33d6eb57 VB |
831 | |
832 | ret_unlock: | |
833 | mutex_unlock(&hiddev->existancelock); | |
834 | return r; | |
1da177e4 LT |
835 | } |
836 | ||
bb6c8d8f PL |
837 | #ifdef CONFIG_COMPAT |
838 | static long hiddev_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
839 | { | |
88af45ba | 840 | return hiddev_ioctl(file, cmd, (unsigned long)compat_ptr(arg)); |
bb6c8d8f PL |
841 | } |
842 | #endif | |
843 | ||
066202dd | 844 | static const struct file_operations hiddev_fops = { |
1da177e4 LT |
845 | .owner = THIS_MODULE, |
846 | .read = hiddev_read, | |
847 | .write = hiddev_write, | |
848 | .poll = hiddev_poll, | |
849 | .open = hiddev_open, | |
850 | .release = hiddev_release, | |
7961df16 | 851 | .unlocked_ioctl = hiddev_ioctl, |
1da177e4 | 852 | .fasync = hiddev_fasync, |
bb6c8d8f PL |
853 | #ifdef CONFIG_COMPAT |
854 | .compat_ioctl = hiddev_compat_ioctl, | |
855 | #endif | |
6038f373 | 856 | .llseek = noop_llseek, |
1da177e4 LT |
857 | }; |
858 | ||
2c9ede55 | 859 | static char *hiddev_devnode(struct device *dev, umode_t *mode) |
f7a386c5 KS |
860 | { |
861 | return kasprintf(GFP_KERNEL, "usb/%s", dev_name(dev)); | |
862 | } | |
863 | ||
1da177e4 | 864 | static struct usb_class_driver hiddev_class = { |
d6e5bcf4 | 865 | .name = "hiddev%d", |
e454cea2 | 866 | .devnode = hiddev_devnode, |
1da177e4 | 867 | .fops = &hiddev_fops, |
05f091ab | 868 | .minor_base = HIDDEV_MINOR_BASE, |
1da177e4 LT |
869 | }; |
870 | ||
871 | /* | |
872 | * This is where hid.c calls us to connect a hid device to the hiddev driver | |
873 | */ | |
93c10132 | 874 | int hiddev_connect(struct hid_device *hid, unsigned int force) |
1da177e4 LT |
875 | { |
876 | struct hiddev *hiddev; | |
4916b3a5 | 877 | struct usbhid_device *usbhid = hid->driver_data; |
1da177e4 LT |
878 | int retval; |
879 | ||
93c10132 JS |
880 | if (!force) { |
881 | unsigned int i; | |
882 | for (i = 0; i < hid->maxcollection; i++) | |
883 | if (hid->collection[i].type == | |
884 | HID_COLLECTION_APPLICATION && | |
885 | !IS_INPUT_APPLICATION(hid->collection[i].usage)) | |
886 | break; | |
1da177e4 | 887 | |
93c10132 JS |
888 | if (i == hid->maxcollection) |
889 | return -1; | |
890 | } | |
1da177e4 | 891 | |
bbdb7daf | 892 | if (!(hiddev = kzalloc(sizeof(struct hiddev), GFP_KERNEL))) |
1da177e4 | 893 | return -1; |
1da177e4 | 894 | |
1da177e4 | 895 | init_waitqueue_head(&hiddev->wait); |
826d5982 | 896 | INIT_LIST_HEAD(&hiddev->list); |
cdcb44e8 | 897 | spin_lock_init(&hiddev->list_lock); |
07903407 | 898 | mutex_init(&hiddev->existancelock); |
76052749 | 899 | hid->hiddev = hiddev; |
1da177e4 LT |
900 | hiddev->hid = hid; |
901 | hiddev->exist = 1; | |
07903407 ON |
902 | retval = usb_register_dev(usbhid->intf, &hiddev_class); |
903 | if (retval) { | |
4291ee30 | 904 | hid_err(hid, "Not able to get a minor for this device\n"); |
76052749 | 905 | hid->hiddev = NULL; |
07903407 ON |
906 | kfree(hiddev); |
907 | return -1; | |
07903407 | 908 | } |
9143059f BT |
909 | |
910 | /* | |
911 | * If HID_QUIRK_NO_INIT_REPORTS is set, make sure we don't initialize | |
912 | * the reports. | |
913 | */ | |
914 | hiddev->initialized = hid->quirks & HID_QUIRK_NO_INIT_REPORTS; | |
915 | ||
733aca90 JK |
916 | hiddev->minor = usbhid->intf->minor; |
917 | ||
1da177e4 LT |
918 | return 0; |
919 | } | |
920 | ||
921 | /* | |
922 | * This is where hid.c calls us to disconnect a hiddev device from the | |
923 | * corresponding hid device (usually because the usb device has disconnected) | |
924 | */ | |
925 | static struct usb_class_driver hiddev_class; | |
926 | void hiddev_disconnect(struct hid_device *hid) | |
927 | { | |
928 | struct hiddev *hiddev = hid->hiddev; | |
4916b3a5 | 929 | struct usbhid_device *usbhid = hid->driver_data; |
1da177e4 | 930 | |
ba18311d ML |
931 | usb_deregister_dev(usbhid->intf, &hiddev_class); |
932 | ||
07903407 | 933 | mutex_lock(&hiddev->existancelock); |
1da177e4 LT |
934 | hiddev->exist = 0; |
935 | ||
1da177e4 | 936 | if (hiddev->open) { |
7f77897e | 937 | mutex_unlock(&hiddev->existancelock); |
d36b7d4c | 938 | hid_hw_close(hiddev->hid); |
1da177e4 LT |
939 | wake_up_interruptible(&hiddev->wait); |
940 | } else { | |
7f77897e | 941 | mutex_unlock(&hiddev->existancelock); |
1da177e4 LT |
942 | kfree(hiddev); |
943 | } | |
944 | } |