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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> | |
30 | #include <linux/module.h> | |
31 | #include <linux/init.h> | |
1da177e4 LT |
32 | #include <linux/input.h> |
33 | #include <linux/usb.h> | |
dde5845a | 34 | #include <linux/hid.h> |
1da177e4 | 35 | #include <linux/hiddev.h> |
bb6c8d8f | 36 | #include <linux/compat.h> |
d4f0e4da | 37 | #include <linux/vmalloc.h> |
dde5845a | 38 | #include "usbhid.h" |
1da177e4 LT |
39 | |
40 | #ifdef CONFIG_USB_DYNAMIC_MINORS | |
41 | #define HIDDEV_MINOR_BASE 0 | |
42 | #define HIDDEV_MINORS 256 | |
43 | #else | |
44 | #define HIDDEV_MINOR_BASE 96 | |
45 | #define HIDDEV_MINORS 16 | |
46 | #endif | |
affbb8c6 | 47 | #define HIDDEV_BUFFER_SIZE 2048 |
1da177e4 LT |
48 | |
49 | struct hiddev { | |
50 | int exist; | |
51 | int open; | |
07903407 | 52 | struct mutex existancelock; |
1da177e4 LT |
53 | wait_queue_head_t wait; |
54 | struct hid_device *hid; | |
826d5982 | 55 | struct list_head list; |
cdcb44e8 | 56 | spinlock_t list_lock; |
1da177e4 LT |
57 | }; |
58 | ||
59 | struct hiddev_list { | |
60 | struct hiddev_usage_ref buffer[HIDDEV_BUFFER_SIZE]; | |
61 | int head; | |
62 | int tail; | |
63 | unsigned flags; | |
64 | struct fasync_struct *fasync; | |
65 | struct hiddev *hiddev; | |
826d5982 | 66 | struct list_head node; |
07903407 | 67 | struct mutex thread_lock; |
1da177e4 LT |
68 | }; |
69 | ||
1da177e4 LT |
70 | /* |
71 | * Find a report, given the report's type and ID. The ID can be specified | |
72 | * indirectly by REPORT_ID_FIRST (which returns the first report of the given | |
73 | * type) or by (REPORT_ID_NEXT | old_id), which returns the next report of the | |
74 | * given type which follows old_id. | |
75 | */ | |
76 | static struct hid_report * | |
77 | hiddev_lookup_report(struct hid_device *hid, struct hiddev_report_info *rinfo) | |
78 | { | |
826d5982 DT |
79 | unsigned int flags = rinfo->report_id & ~HID_REPORT_ID_MASK; |
80 | unsigned int rid = rinfo->report_id & HID_REPORT_ID_MASK; | |
1da177e4 | 81 | struct hid_report_enum *report_enum; |
826d5982 | 82 | struct hid_report *report; |
1da177e4 LT |
83 | struct list_head *list; |
84 | ||
85 | if (rinfo->report_type < HID_REPORT_TYPE_MIN || | |
826d5982 DT |
86 | rinfo->report_type > HID_REPORT_TYPE_MAX) |
87 | return NULL; | |
1da177e4 LT |
88 | |
89 | report_enum = hid->report_enum + | |
90 | (rinfo->report_type - HID_REPORT_TYPE_MIN); | |
91 | ||
92 | switch (flags) { | |
93 | case 0: /* Nothing to do -- report_id is already set correctly */ | |
94 | break; | |
95 | ||
96 | case HID_REPORT_ID_FIRST: | |
826d5982 | 97 | if (list_empty(&report_enum->report_list)) |
1da177e4 | 98 | return NULL; |
826d5982 DT |
99 | |
100 | list = report_enum->report_list.next; | |
101 | report = list_entry(list, struct hid_report, list); | |
102 | rinfo->report_id = report->id; | |
1da177e4 | 103 | break; |
05f091ab | 104 | |
1da177e4 | 105 | case HID_REPORT_ID_NEXT: |
826d5982 DT |
106 | report = report_enum->report_id_hash[rid]; |
107 | if (!report) | |
1da177e4 | 108 | return NULL; |
826d5982 DT |
109 | |
110 | list = report->list.next; | |
1da177e4 LT |
111 | if (list == &report_enum->report_list) |
112 | return NULL; | |
826d5982 DT |
113 | |
114 | report = list_entry(list, struct hid_report, list); | |
115 | rinfo->report_id = report->id; | |
1da177e4 | 116 | break; |
05f091ab | 117 | |
1da177e4 LT |
118 | default: |
119 | return NULL; | |
120 | } | |
121 | ||
122 | return report_enum->report_id_hash[rinfo->report_id]; | |
123 | } | |
124 | ||
125 | /* | |
126 | * Perform an exhaustive search of the report table for a usage, given its | |
127 | * type and usage id. | |
128 | */ | |
129 | static struct hid_field * | |
130 | hiddev_lookup_usage(struct hid_device *hid, struct hiddev_usage_ref *uref) | |
131 | { | |
132 | int i, j; | |
133 | struct hid_report *report; | |
134 | struct hid_report_enum *report_enum; | |
135 | struct hid_field *field; | |
136 | ||
137 | if (uref->report_type < HID_REPORT_TYPE_MIN || | |
826d5982 DT |
138 | uref->report_type > HID_REPORT_TYPE_MAX) |
139 | return NULL; | |
1da177e4 LT |
140 | |
141 | report_enum = hid->report_enum + | |
142 | (uref->report_type - HID_REPORT_TYPE_MIN); | |
143 | ||
826d5982 | 144 | list_for_each_entry(report, &report_enum->report_list, list) { |
1da177e4 LT |
145 | for (i = 0; i < report->maxfield; i++) { |
146 | field = report->field[i]; | |
147 | for (j = 0; j < field->maxusage; j++) { | |
148 | if (field->usage[j].hid == uref->usage_code) { | |
149 | uref->report_id = report->id; | |
150 | uref->field_index = i; | |
151 | uref->usage_index = j; | |
152 | return field; | |
153 | } | |
154 | } | |
155 | } | |
826d5982 | 156 | } |
1da177e4 LT |
157 | |
158 | return NULL; | |
159 | } | |
160 | ||
161 | static void hiddev_send_event(struct hid_device *hid, | |
162 | struct hiddev_usage_ref *uref) | |
163 | { | |
164 | struct hiddev *hiddev = hid->hiddev; | |
826d5982 | 165 | struct hiddev_list *list; |
cdcb44e8 | 166 | unsigned long flags; |
1da177e4 | 167 | |
cdcb44e8 | 168 | spin_lock_irqsave(&hiddev->list_lock, flags); |
826d5982 | 169 | list_for_each_entry(list, &hiddev->list, node) { |
1da177e4 LT |
170 | if (uref->field_index != HID_FIELD_INDEX_NONE || |
171 | (list->flags & HIDDEV_FLAG_REPORT) != 0) { | |
172 | list->buffer[list->head] = *uref; | |
05f091ab | 173 | list->head = (list->head + 1) & |
1da177e4 LT |
174 | (HIDDEV_BUFFER_SIZE - 1); |
175 | kill_fasync(&list->fasync, SIGIO, POLL_IN); | |
176 | } | |
1da177e4 | 177 | } |
cdcb44e8 | 178 | spin_unlock_irqrestore(&hiddev->list_lock, flags); |
1da177e4 LT |
179 | |
180 | wake_up_interruptible(&hiddev->wait); | |
181 | } | |
182 | ||
183 | /* | |
184 | * This is where hid.c calls into hiddev to pass an event that occurred over | |
185 | * the interrupt pipe | |
186 | */ | |
187 | void hiddev_hid_event(struct hid_device *hid, struct hid_field *field, | |
7d12e780 | 188 | struct hid_usage *usage, __s32 value) |
1da177e4 LT |
189 | { |
190 | unsigned type = field->report_type; | |
191 | struct hiddev_usage_ref uref; | |
192 | ||
05f091ab | 193 | uref.report_type = |
1da177e4 | 194 | (type == HID_INPUT_REPORT) ? HID_REPORT_TYPE_INPUT : |
05f091ab | 195 | ((type == HID_OUTPUT_REPORT) ? HID_REPORT_TYPE_OUTPUT : |
826d5982 | 196 | ((type == HID_FEATURE_REPORT) ? HID_REPORT_TYPE_FEATURE : 0)); |
1da177e4 LT |
197 | uref.report_id = field->report->id; |
198 | uref.field_index = field->index; | |
199 | uref.usage_index = (usage - field->usage); | |
200 | uref.usage_code = usage->hid; | |
201 | uref.value = value; | |
202 | ||
203 | hiddev_send_event(hid, &uref); | |
204 | } | |
229695e5 | 205 | EXPORT_SYMBOL_GPL(hiddev_hid_event); |
1da177e4 LT |
206 | |
207 | void hiddev_report_event(struct hid_device *hid, struct hid_report *report) | |
208 | { | |
209 | unsigned type = report->type; | |
210 | struct hiddev_usage_ref uref; | |
211 | ||
212 | memset(&uref, 0, sizeof(uref)); | |
05f091ab | 213 | uref.report_type = |
1da177e4 | 214 | (type == HID_INPUT_REPORT) ? HID_REPORT_TYPE_INPUT : |
05f091ab | 215 | ((type == HID_OUTPUT_REPORT) ? HID_REPORT_TYPE_OUTPUT : |
826d5982 | 216 | ((type == HID_FEATURE_REPORT) ? HID_REPORT_TYPE_FEATURE : 0)); |
1da177e4 LT |
217 | uref.report_id = report->id; |
218 | uref.field_index = HID_FIELD_INDEX_NONE; | |
219 | ||
220 | hiddev_send_event(hid, &uref); | |
221 | } | |
aa8de2f0 | 222 | |
1da177e4 LT |
223 | /* |
224 | * fasync file op | |
225 | */ | |
226 | static int hiddev_fasync(int fd, struct file *file, int on) | |
227 | { | |
1da177e4 | 228 | struct hiddev_list *list = file->private_data; |
826d5982 | 229 | |
60aa4924 | 230 | return fasync_helper(fd, file, on, &list->fasync); |
1da177e4 LT |
231 | } |
232 | ||
233 | ||
234 | /* | |
235 | * release file op | |
236 | */ | |
237 | static int hiddev_release(struct inode * inode, struct file * file) | |
238 | { | |
239 | struct hiddev_list *list = file->private_data; | |
cdcb44e8 | 240 | unsigned long flags; |
1da177e4 | 241 | |
cdcb44e8 | 242 | spin_lock_irqsave(&list->hiddev->list_lock, flags); |
826d5982 | 243 | list_del(&list->node); |
cdcb44e8 | 244 | spin_unlock_irqrestore(&list->hiddev->list_lock, flags); |
1da177e4 | 245 | |
6cb4b040 | 246 | mutex_lock(&list->hiddev->existancelock); |
1da177e4 | 247 | if (!--list->hiddev->open) { |
0361a28d | 248 | if (list->hiddev->exist) { |
4916b3a5 | 249 | usbhid_close(list->hiddev->hid); |
0361a28d ON |
250 | usbhid_put_power(list->hiddev->hid); |
251 | } else { | |
5c699d7d | 252 | mutex_unlock(&list->hiddev->existancelock); |
1da177e4 | 253 | kfree(list->hiddev); |
d4f0e4da | 254 | vfree(list); |
5c699d7d | 255 | return 0; |
0361a28d | 256 | } |
1da177e4 LT |
257 | } |
258 | ||
6cb4b040 | 259 | mutex_unlock(&list->hiddev->existancelock); |
d4f0e4da | 260 | vfree(list); |
1da177e4 LT |
261 | |
262 | return 0; | |
263 | } | |
264 | ||
265 | /* | |
266 | * open file op | |
267 | */ | |
826d5982 DT |
268 | static int hiddev_open(struct inode *inode, struct file *file) |
269 | { | |
1da177e4 | 270 | struct hiddev_list *list; |
bd25f4dd | 271 | struct usb_interface *intf; |
9c9e54a8 | 272 | struct hid_device *hid; |
bd25f4dd AB |
273 | struct hiddev *hiddev; |
274 | int res; | |
1da177e4 | 275 | |
8fe294ca | 276 | intf = usbhid_find_interface(iminor(inode)); |
bd25f4dd | 277 | if (!intf) |
1da177e4 | 278 | return -ENODEV; |
9c9e54a8 JK |
279 | hid = usb_get_intfdata(intf); |
280 | hiddev = hid->hiddev; | |
1da177e4 | 281 | |
d4f0e4da | 282 | if (!(list = vzalloc(sizeof(struct hiddev_list)))) |
1da177e4 | 283 | return -ENOMEM; |
07903407 | 284 | mutex_init(&list->thread_lock); |
bd25f4dd | 285 | list->hiddev = hiddev; |
1da177e4 LT |
286 | file->private_data = list; |
287 | ||
07903407 ON |
288 | /* |
289 | * no need for locking because the USB major number | |
290 | * is shared which usbcore guards against disconnect | |
291 | */ | |
292 | if (list->hiddev->exist) { | |
293 | if (!list->hiddev->open++) { | |
bd25f4dd | 294 | res = usbhid_open(hiddev->hid); |
07903407 ON |
295 | if (res < 0) { |
296 | res = -EIO; | |
297 | goto bail; | |
298 | } | |
299 | } | |
300 | } else { | |
301 | res = -ENODEV; | |
302 | goto bail; | |
303 | } | |
304 | ||
305 | spin_lock_irq(&list->hiddev->list_lock); | |
bd25f4dd | 306 | list_add_tail(&list->node, &hiddev->list); |
07903407 | 307 | spin_unlock_irq(&list->hiddev->list_lock); |
1da177e4 | 308 | |
6cb4b040 | 309 | mutex_lock(&hiddev->existancelock); |
0361a28d ON |
310 | if (!list->hiddev->open++) |
311 | if (list->hiddev->exist) { | |
bd25f4dd | 312 | struct hid_device *hid = hiddev->hid; |
0361a28d ON |
313 | res = usbhid_get_power(hid); |
314 | if (res < 0) { | |
315 | res = -EIO; | |
6cb4b040 | 316 | goto bail_unlock; |
0361a28d ON |
317 | } |
318 | usbhid_open(hid); | |
319 | } | |
6cb4b040 | 320 | mutex_unlock(&hiddev->existancelock); |
1da177e4 | 321 | return 0; |
6cb4b040 JK |
322 | bail_unlock: |
323 | mutex_unlock(&hiddev->existancelock); | |
07903407 ON |
324 | bail: |
325 | file->private_data = NULL; | |
d4f0e4da | 326 | vfree(list); |
07903407 | 327 | return res; |
1da177e4 LT |
328 | } |
329 | ||
330 | /* | |
331 | * "write" file op | |
332 | */ | |
333 | static ssize_t hiddev_write(struct file * file, const char __user * buffer, size_t count, loff_t *ppos) | |
334 | { | |
335 | return -EINVAL; | |
336 | } | |
337 | ||
338 | /* | |
339 | * "read" file op | |
340 | */ | |
341 | static ssize_t hiddev_read(struct file * file, char __user * buffer, size_t count, loff_t *ppos) | |
342 | { | |
96fe2ab8 | 343 | DEFINE_WAIT(wait); |
1da177e4 LT |
344 | struct hiddev_list *list = file->private_data; |
345 | int event_size; | |
07903407 | 346 | int retval; |
1da177e4 LT |
347 | |
348 | event_size = ((list->flags & HIDDEV_FLAG_UREF) != 0) ? | |
349 | sizeof(struct hiddev_usage_ref) : sizeof(struct hiddev_event); | |
350 | ||
351 | if (count < event_size) | |
352 | return 0; | |
353 | ||
07903407 ON |
354 | /* lock against other threads */ |
355 | retval = mutex_lock_interruptible(&list->thread_lock); | |
356 | if (retval) | |
357 | return -ERESTARTSYS; | |
358 | ||
1da177e4 LT |
359 | while (retval == 0) { |
360 | if (list->head == list->tail) { | |
07903407 | 361 | prepare_to_wait(&list->hiddev->wait, &wait, TASK_INTERRUPTIBLE); |
05f091ab | 362 | |
1da177e4 | 363 | while (list->head == list->tail) { |
1da177e4 LT |
364 | if (signal_pending(current)) { |
365 | retval = -ERESTARTSYS; | |
366 | break; | |
367 | } | |
368 | if (!list->hiddev->exist) { | |
369 | retval = -EIO; | |
370 | break; | |
371 | } | |
13f19624 JK |
372 | if (file->f_flags & O_NONBLOCK) { |
373 | retval = -EAGAIN; | |
374 | break; | |
375 | } | |
05f091ab | 376 | |
07903407 ON |
377 | /* let O_NONBLOCK tasks run */ |
378 | mutex_unlock(&list->thread_lock); | |
1da177e4 | 379 | schedule(); |
06268b2a PW |
380 | if (mutex_lock_interruptible(&list->thread_lock)) { |
381 | finish_wait(&list->hiddev->wait, &wait); | |
07903407 | 382 | return -EINTR; |
06268b2a | 383 | } |
48d70552 | 384 | set_current_state(TASK_INTERRUPTIBLE); |
1da177e4 | 385 | } |
07903407 | 386 | finish_wait(&list->hiddev->wait, &wait); |
1da177e4 | 387 | |
1da177e4 LT |
388 | } |
389 | ||
07903407 ON |
390 | if (retval) { |
391 | mutex_unlock(&list->thread_lock); | |
1da177e4 | 392 | return retval; |
07903407 | 393 | } |
1da177e4 LT |
394 | |
395 | ||
05f091ab | 396 | while (list->head != list->tail && |
1da177e4 LT |
397 | retval + event_size <= count) { |
398 | if ((list->flags & HIDDEV_FLAG_UREF) == 0) { | |
07903407 | 399 | if (list->buffer[list->tail].field_index != HID_FIELD_INDEX_NONE) { |
1da177e4 | 400 | struct hiddev_event event; |
07903407 | 401 | |
1da177e4 LT |
402 | event.hid = list->buffer[list->tail].usage_code; |
403 | event.value = list->buffer[list->tail].value; | |
07903407 ON |
404 | if (copy_to_user(buffer + retval, &event, sizeof(struct hiddev_event))) { |
405 | mutex_unlock(&list->thread_lock); | |
1da177e4 | 406 | return -EFAULT; |
07903407 | 407 | } |
1da177e4 LT |
408 | retval += sizeof(struct hiddev_event); |
409 | } | |
410 | } else { | |
411 | if (list->buffer[list->tail].field_index != HID_FIELD_INDEX_NONE || | |
412 | (list->flags & HIDDEV_FLAG_REPORT) != 0) { | |
07903407 ON |
413 | |
414 | if (copy_to_user(buffer + retval, list->buffer + list->tail, sizeof(struct hiddev_usage_ref))) { | |
415 | mutex_unlock(&list->thread_lock); | |
1da177e4 | 416 | return -EFAULT; |
07903407 | 417 | } |
1da177e4 LT |
418 | retval += sizeof(struct hiddev_usage_ref); |
419 | } | |
420 | } | |
421 | list->tail = (list->tail + 1) & (HIDDEV_BUFFER_SIZE - 1); | |
422 | } | |
423 | ||
424 | } | |
07903407 | 425 | mutex_unlock(&list->thread_lock); |
1da177e4 LT |
426 | |
427 | return retval; | |
428 | } | |
429 | ||
430 | /* | |
431 | * "poll" file op | |
432 | * No kernel lock - fine | |
433 | */ | |
434 | static unsigned int hiddev_poll(struct file *file, poll_table *wait) | |
435 | { | |
436 | struct hiddev_list *list = file->private_data; | |
826d5982 | 437 | |
1da177e4 LT |
438 | poll_wait(file, &list->hiddev->wait, wait); |
439 | if (list->head != list->tail) | |
440 | return POLLIN | POLLRDNORM; | |
441 | if (!list->hiddev->exist) | |
442 | return POLLERR | POLLHUP; | |
443 | return 0; | |
444 | } | |
445 | ||
446 | /* | |
447 | * "ioctl" file op | |
448 | */ | |
cf2a299e JD |
449 | static noinline int hiddev_ioctl_usage(struct hiddev *hiddev, unsigned int cmd, void __user *user_arg) |
450 | { | |
451 | struct hid_device *hid = hiddev->hid; | |
452 | struct hiddev_report_info rinfo; | |
453 | struct hiddev_usage_ref_multi *uref_multi = NULL; | |
454 | struct hiddev_usage_ref *uref; | |
455 | struct hid_report *report; | |
456 | struct hid_field *field; | |
457 | int i; | |
458 | ||
459 | uref_multi = kmalloc(sizeof(struct hiddev_usage_ref_multi), GFP_KERNEL); | |
460 | if (!uref_multi) | |
461 | return -ENOMEM; | |
462 | uref = &uref_multi->uref; | |
463 | if (cmd == HIDIOCGUSAGES || cmd == HIDIOCSUSAGES) { | |
464 | if (copy_from_user(uref_multi, user_arg, | |
465 | sizeof(*uref_multi))) | |
466 | goto fault; | |
467 | } else { | |
468 | if (copy_from_user(uref, user_arg, sizeof(*uref))) | |
469 | goto fault; | |
470 | } | |
471 | ||
472 | switch (cmd) { | |
473 | case HIDIOCGUCODE: | |
474 | rinfo.report_type = uref->report_type; | |
475 | rinfo.report_id = uref->report_id; | |
476 | if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL) | |
477 | goto inval; | |
478 | ||
479 | if (uref->field_index >= report->maxfield) | |
480 | goto inval; | |
481 | ||
482 | field = report->field[uref->field_index]; | |
483 | if (uref->usage_index >= field->maxusage) | |
484 | goto inval; | |
485 | ||
486 | uref->usage_code = field->usage[uref->usage_index].hid; | |
487 | ||
488 | if (copy_to_user(user_arg, uref, sizeof(*uref))) | |
489 | goto fault; | |
490 | ||
eb991089 | 491 | goto goodreturn; |
cf2a299e JD |
492 | |
493 | default: | |
494 | if (cmd != HIDIOCGUSAGE && | |
495 | cmd != HIDIOCGUSAGES && | |
496 | uref->report_type == HID_REPORT_TYPE_INPUT) | |
497 | goto inval; | |
498 | ||
499 | if (uref->report_id == HID_REPORT_ID_UNKNOWN) { | |
500 | field = hiddev_lookup_usage(hid, uref); | |
501 | if (field == NULL) | |
502 | goto inval; | |
503 | } else { | |
504 | rinfo.report_type = uref->report_type; | |
505 | rinfo.report_id = uref->report_id; | |
506 | if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL) | |
507 | goto inval; | |
508 | ||
509 | if (uref->field_index >= report->maxfield) | |
510 | goto inval; | |
511 | ||
512 | field = report->field[uref->field_index]; | |
513 | ||
514 | if (cmd == HIDIOCGCOLLECTIONINDEX) { | |
515 | if (uref->usage_index >= field->maxusage) | |
516 | goto inval; | |
517 | } else if (uref->usage_index >= field->report_count) | |
518 | goto inval; | |
519 | ||
520 | else if ((cmd == HIDIOCGUSAGES || cmd == HIDIOCSUSAGES) && | |
521 | (uref_multi->num_values > HID_MAX_MULTI_USAGES || | |
522 | uref->usage_index + uref_multi->num_values > field->report_count)) | |
523 | goto inval; | |
ac065bf2 | 524 | } |
cf2a299e JD |
525 | |
526 | switch (cmd) { | |
527 | case HIDIOCGUSAGE: | |
528 | uref->value = field->value[uref->usage_index]; | |
529 | if (copy_to_user(user_arg, uref, sizeof(*uref))) | |
530 | goto fault; | |
531 | goto goodreturn; | |
532 | ||
533 | case HIDIOCSUSAGE: | |
534 | field->value[uref->usage_index] = uref->value; | |
535 | goto goodreturn; | |
536 | ||
537 | case HIDIOCGCOLLECTIONINDEX: | |
4859484b | 538 | i = field->usage[uref->usage_index].collection_index; |
cf2a299e | 539 | kfree(uref_multi); |
4859484b | 540 | return i; |
cf2a299e JD |
541 | case HIDIOCGUSAGES: |
542 | for (i = 0; i < uref_multi->num_values; i++) | |
543 | uref_multi->values[i] = | |
544 | field->value[uref->usage_index + i]; | |
545 | if (copy_to_user(user_arg, uref_multi, | |
546 | sizeof(*uref_multi))) | |
547 | goto fault; | |
548 | goto goodreturn; | |
549 | case HIDIOCSUSAGES: | |
550 | for (i = 0; i < uref_multi->num_values; i++) | |
551 | field->value[uref->usage_index + i] = | |
552 | uref_multi->values[i]; | |
553 | goto goodreturn; | |
554 | } | |
555 | ||
556 | goodreturn: | |
557 | kfree(uref_multi); | |
558 | return 0; | |
559 | fault: | |
560 | kfree(uref_multi); | |
561 | return -EFAULT; | |
562 | inval: | |
563 | kfree(uref_multi); | |
564 | return -EINVAL; | |
565 | } | |
566 | } | |
567 | ||
568 | static noinline int hiddev_ioctl_string(struct hiddev *hiddev, unsigned int cmd, void __user *user_arg) | |
569 | { | |
570 | struct hid_device *hid = hiddev->hid; | |
571 | struct usb_device *dev = hid_to_usb_dev(hid); | |
572 | int idx, len; | |
573 | char *buf; | |
574 | ||
575 | if (get_user(idx, (int __user *)user_arg)) | |
576 | return -EFAULT; | |
577 | ||
578 | if ((buf = kmalloc(HID_STRING_SIZE, GFP_KERNEL)) == NULL) | |
579 | return -ENOMEM; | |
580 | ||
581 | if ((len = usb_string(dev, idx, buf, HID_STRING_SIZE-1)) < 0) { | |
582 | kfree(buf); | |
583 | return -EINVAL; | |
584 | } | |
585 | ||
586 | if (copy_to_user(user_arg+sizeof(int), buf, len+1)) { | |
587 | kfree(buf); | |
588 | return -EFAULT; | |
589 | } | |
590 | ||
591 | kfree(buf); | |
592 | ||
593 | return len; | |
594 | } | |
595 | ||
7961df16 | 596 | static long hiddev_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
1da177e4 LT |
597 | { |
598 | struct hiddev_list *list = file->private_data; | |
599 | struct hiddev *hiddev = list->hiddev; | |
1a8e8fab | 600 | struct hid_device *hid; |
1da177e4 LT |
601 | struct hiddev_collection_info cinfo; |
602 | struct hiddev_report_info rinfo; | |
603 | struct hiddev_field_info finfo; | |
1da177e4 LT |
604 | struct hiddev_devinfo dinfo; |
605 | struct hid_report *report; | |
606 | struct hid_field *field; | |
607 | void __user *user_arg = (void __user *)arg; | |
33d6eb57 | 608 | int i, r = -EINVAL; |
1a8e8fab | 609 | |
7961df16 | 610 | /* Called without BKL by compat methods so no BKL taken */ |
1da177e4 | 611 | |
33d6eb57 VB |
612 | mutex_lock(&hiddev->existancelock); |
613 | if (!hiddev->exist) { | |
614 | r = -ENODEV; | |
615 | goto ret_unlock; | |
616 | } | |
617 | ||
618 | hid = hiddev->hid; | |
1da177e4 LT |
619 | |
620 | switch (cmd) { | |
621 | ||
622 | case HIDIOCGVERSION: | |
33d6eb57 VB |
623 | r = put_user(HID_VERSION, (int __user *)arg) ? |
624 | -EFAULT : 0; | |
625 | break; | |
1da177e4 LT |
626 | |
627 | case HIDIOCAPPLICATION: | |
d339f61d | 628 | if (arg >= hid->maxapplication) |
33d6eb57 | 629 | break; |
1da177e4 LT |
630 | |
631 | for (i = 0; i < hid->maxcollection; i++) | |
05f091ab | 632 | if (hid->collection[i].type == |
1da177e4 LT |
633 | HID_COLLECTION_APPLICATION && arg-- == 0) |
634 | break; | |
05f091ab | 635 | |
33d6eb57 | 636 | if (i < hid->maxcollection) |
1a8e8fab | 637 | r = hid->collection[i].usage; |
33d6eb57 | 638 | break; |
1da177e4 LT |
639 | |
640 | case HIDIOCGDEVINFO: | |
33d6eb57 VB |
641 | { |
642 | struct usb_device *dev = hid_to_usb_dev(hid); | |
643 | struct usbhid_device *usbhid = hid->driver_data; | |
644 | ||
9561f7fa DC |
645 | memset(&dinfo, 0, sizeof(dinfo)); |
646 | ||
33d6eb57 VB |
647 | dinfo.bustype = BUS_USB; |
648 | dinfo.busnum = dev->bus->busnum; | |
649 | dinfo.devnum = dev->devnum; | |
650 | dinfo.ifnum = usbhid->ifnum; | |
651 | dinfo.vendor = le16_to_cpu(dev->descriptor.idVendor); | |
652 | dinfo.product = le16_to_cpu(dev->descriptor.idProduct); | |
653 | dinfo.version = le16_to_cpu(dev->descriptor.bcdDevice); | |
654 | dinfo.num_applications = hid->maxapplication; | |
655 | ||
656 | r = copy_to_user(user_arg, &dinfo, sizeof(dinfo)) ? | |
657 | -EFAULT : 0; | |
658 | break; | |
1a8e8fab VB |
659 | } |
660 | ||
1da177e4 | 661 | case HIDIOCGFLAG: |
33d6eb57 VB |
662 | r = put_user(list->flags, (int __user *)arg) ? |
663 | -EFAULT : 0; | |
664 | break; | |
1da177e4 LT |
665 | |
666 | case HIDIOCSFLAG: | |
667 | { | |
668 | int newflags; | |
33d6eb57 VB |
669 | |
670 | if (get_user(newflags, (int __user *)arg)) { | |
671 | r = -EFAULT; | |
672 | break; | |
673 | } | |
1da177e4 LT |
674 | |
675 | if ((newflags & ~HIDDEV_FLAGS) != 0 || | |
676 | ((newflags & HIDDEV_FLAG_REPORT) != 0 && | |
677 | (newflags & HIDDEV_FLAG_UREF) == 0)) | |
33d6eb57 | 678 | break; |
1da177e4 LT |
679 | |
680 | list->flags = newflags; | |
681 | ||
33d6eb57 VB |
682 | r = 0; |
683 | break; | |
1da177e4 LT |
684 | } |
685 | ||
686 | case HIDIOCGSTRING: | |
33d6eb57 VB |
687 | r = hiddev_ioctl_string(hiddev, cmd, user_arg); |
688 | break; | |
1da177e4 LT |
689 | |
690 | case HIDIOCINITREPORT: | |
4916b3a5 | 691 | usbhid_init_reports(hid); |
33d6eb57 VB |
692 | r = 0; |
693 | break; | |
1da177e4 LT |
694 | |
695 | case HIDIOCGREPORT: | |
33d6eb57 VB |
696 | if (copy_from_user(&rinfo, user_arg, sizeof(rinfo))) { |
697 | r = -EFAULT; | |
698 | break; | |
699 | } | |
1da177e4 LT |
700 | |
701 | if (rinfo.report_type == HID_REPORT_TYPE_OUTPUT) | |
33d6eb57 | 702 | break; |
1a8e8fab | 703 | |
1a8e8fab | 704 | report = hiddev_lookup_report(hid, &rinfo); |
33d6eb57 VB |
705 | if (report == NULL) |
706 | break; | |
1a8e8fab | 707 | |
d8814272 | 708 | hid_hw_request(hid, report, HID_REQ_GET_REPORT); |
b7966a4d | 709 | hid_hw_wait(hid); |
1da177e4 | 710 | |
33d6eb57 VB |
711 | r = 0; |
712 | break; | |
1da177e4 LT |
713 | |
714 | case HIDIOCSREPORT: | |
33d6eb57 VB |
715 | if (copy_from_user(&rinfo, user_arg, sizeof(rinfo))) { |
716 | r = -EFAULT; | |
717 | break; | |
718 | } | |
1da177e4 LT |
719 | |
720 | if (rinfo.report_type == HID_REPORT_TYPE_INPUT) | |
33d6eb57 | 721 | break; |
1a8e8fab | 722 | |
1a8e8fab | 723 | report = hiddev_lookup_report(hid, &rinfo); |
33d6eb57 VB |
724 | if (report == NULL) |
725 | break; | |
1a8e8fab | 726 | |
d8814272 | 727 | hid_hw_request(hid, report, HID_REQ_SET_REPORT); |
b7966a4d | 728 | hid_hw_wait(hid); |
1da177e4 | 729 | |
33d6eb57 VB |
730 | r = 0; |
731 | break; | |
1da177e4 LT |
732 | |
733 | case HIDIOCGREPORTINFO: | |
33d6eb57 VB |
734 | if (copy_from_user(&rinfo, user_arg, sizeof(rinfo))) { |
735 | r = -EFAULT; | |
736 | break; | |
1a8e8fab VB |
737 | } |
738 | ||
1a8e8fab | 739 | report = hiddev_lookup_report(hid, &rinfo); |
33d6eb57 VB |
740 | if (report == NULL) |
741 | break; | |
1da177e4 LT |
742 | |
743 | rinfo.num_fields = report->maxfield; | |
1da177e4 | 744 | |
33d6eb57 VB |
745 | r = copy_to_user(user_arg, &rinfo, sizeof(rinfo)) ? |
746 | -EFAULT : 0; | |
747 | break; | |
1da177e4 LT |
748 | |
749 | case HIDIOCGFIELDINFO: | |
33d6eb57 VB |
750 | if (copy_from_user(&finfo, user_arg, sizeof(finfo))) { |
751 | r = -EFAULT; | |
752 | break; | |
753 | } | |
754 | ||
1da177e4 LT |
755 | rinfo.report_type = finfo.report_type; |
756 | rinfo.report_id = finfo.report_id; | |
1da177e4 | 757 | |
1a8e8fab | 758 | report = hiddev_lookup_report(hid, &rinfo); |
33d6eb57 VB |
759 | if (report == NULL) |
760 | break; | |
1a8e8fab | 761 | |
33d6eb57 VB |
762 | if (finfo.field_index >= report->maxfield) |
763 | break; | |
1da177e4 LT |
764 | |
765 | field = report->field[finfo.field_index]; | |
766 | memset(&finfo, 0, sizeof(finfo)); | |
767 | finfo.report_type = rinfo.report_type; | |
768 | finfo.report_id = rinfo.report_id; | |
769 | finfo.field_index = field->report_count - 1; | |
770 | finfo.maxusage = field->maxusage; | |
771 | finfo.flags = field->flags; | |
772 | finfo.physical = field->physical; | |
773 | finfo.logical = field->logical; | |
774 | finfo.application = field->application; | |
775 | finfo.logical_minimum = field->logical_minimum; | |
776 | finfo.logical_maximum = field->logical_maximum; | |
777 | finfo.physical_minimum = field->physical_minimum; | |
778 | finfo.physical_maximum = field->physical_maximum; | |
779 | finfo.unit_exponent = field->unit_exponent; | |
780 | finfo.unit = field->unit; | |
1da177e4 | 781 | |
33d6eb57 VB |
782 | r = copy_to_user(user_arg, &finfo, sizeof(finfo)) ? |
783 | -EFAULT : 0; | |
784 | break; | |
1da177e4 LT |
785 | |
786 | case HIDIOCGUCODE: | |
cf2a299e | 787 | /* fall through */ |
1da177e4 LT |
788 | case HIDIOCGUSAGE: |
789 | case HIDIOCSUSAGE: | |
790 | case HIDIOCGUSAGES: | |
791 | case HIDIOCSUSAGES: | |
792 | case HIDIOCGCOLLECTIONINDEX: | |
33d6eb57 VB |
793 | r = hiddev_ioctl_usage(hiddev, cmd, user_arg); |
794 | break; | |
1da177e4 LT |
795 | |
796 | case HIDIOCGCOLLECTIONINFO: | |
33d6eb57 VB |
797 | if (copy_from_user(&cinfo, user_arg, sizeof(cinfo))) { |
798 | r = -EFAULT; | |
799 | break; | |
1a8e8fab VB |
800 | } |
801 | ||
33d6eb57 VB |
802 | if (cinfo.index >= hid->maxcollection) |
803 | break; | |
1da177e4 LT |
804 | |
805 | cinfo.type = hid->collection[cinfo.index].type; | |
806 | cinfo.usage = hid->collection[cinfo.index].usage; | |
807 | cinfo.level = hid->collection[cinfo.index].level; | |
808 | ||
33d6eb57 VB |
809 | r = copy_to_user(user_arg, &cinfo, sizeof(cinfo)) ? |
810 | -EFAULT : 0; | |
811 | break; | |
1da177e4 LT |
812 | |
813 | default: | |
1da177e4 | 814 | if (_IOC_TYPE(cmd) != 'H' || _IOC_DIR(cmd) != _IOC_READ) |
33d6eb57 | 815 | break; |
1da177e4 LT |
816 | |
817 | if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGNAME(0))) { | |
dd2ed487 | 818 | int len = strlen(hid->name) + 1; |
1da177e4 LT |
819 | if (len > _IOC_SIZE(cmd)) |
820 | len = _IOC_SIZE(cmd); | |
1a8e8fab | 821 | r = copy_to_user(user_arg, hid->name, len) ? |
1da177e4 | 822 | -EFAULT : len; |
33d6eb57 | 823 | break; |
1da177e4 LT |
824 | } |
825 | ||
826 | if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGPHYS(0))) { | |
dd2ed487 | 827 | int len = strlen(hid->phys) + 1; |
1da177e4 LT |
828 | if (len > _IOC_SIZE(cmd)) |
829 | len = _IOC_SIZE(cmd); | |
1a8e8fab | 830 | r = copy_to_user(user_arg, hid->phys, len) ? |
1da177e4 | 831 | -EFAULT : len; |
33d6eb57 | 832 | break; |
1da177e4 LT |
833 | } |
834 | } | |
33d6eb57 VB |
835 | |
836 | ret_unlock: | |
837 | mutex_unlock(&hiddev->existancelock); | |
838 | return r; | |
1da177e4 LT |
839 | } |
840 | ||
bb6c8d8f PL |
841 | #ifdef CONFIG_COMPAT |
842 | static long hiddev_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
843 | { | |
88af45ba | 844 | return hiddev_ioctl(file, cmd, (unsigned long)compat_ptr(arg)); |
bb6c8d8f PL |
845 | } |
846 | #endif | |
847 | ||
066202dd | 848 | static const struct file_operations hiddev_fops = { |
1da177e4 LT |
849 | .owner = THIS_MODULE, |
850 | .read = hiddev_read, | |
851 | .write = hiddev_write, | |
852 | .poll = hiddev_poll, | |
853 | .open = hiddev_open, | |
854 | .release = hiddev_release, | |
7961df16 | 855 | .unlocked_ioctl = hiddev_ioctl, |
1da177e4 | 856 | .fasync = hiddev_fasync, |
bb6c8d8f PL |
857 | #ifdef CONFIG_COMPAT |
858 | .compat_ioctl = hiddev_compat_ioctl, | |
859 | #endif | |
6038f373 | 860 | .llseek = noop_llseek, |
1da177e4 LT |
861 | }; |
862 | ||
2c9ede55 | 863 | static char *hiddev_devnode(struct device *dev, umode_t *mode) |
f7a386c5 KS |
864 | { |
865 | return kasprintf(GFP_KERNEL, "usb/%s", dev_name(dev)); | |
866 | } | |
867 | ||
1da177e4 | 868 | static struct usb_class_driver hiddev_class = { |
d6e5bcf4 | 869 | .name = "hiddev%d", |
e454cea2 | 870 | .devnode = hiddev_devnode, |
1da177e4 | 871 | .fops = &hiddev_fops, |
05f091ab | 872 | .minor_base = HIDDEV_MINOR_BASE, |
1da177e4 LT |
873 | }; |
874 | ||
875 | /* | |
876 | * This is where hid.c calls us to connect a hid device to the hiddev driver | |
877 | */ | |
93c10132 | 878 | int hiddev_connect(struct hid_device *hid, unsigned int force) |
1da177e4 LT |
879 | { |
880 | struct hiddev *hiddev; | |
4916b3a5 | 881 | struct usbhid_device *usbhid = hid->driver_data; |
1da177e4 LT |
882 | int retval; |
883 | ||
93c10132 JS |
884 | if (!force) { |
885 | unsigned int i; | |
886 | for (i = 0; i < hid->maxcollection; i++) | |
887 | if (hid->collection[i].type == | |
888 | HID_COLLECTION_APPLICATION && | |
889 | !IS_INPUT_APPLICATION(hid->collection[i].usage)) | |
890 | break; | |
1da177e4 | 891 | |
93c10132 JS |
892 | if (i == hid->maxcollection) |
893 | return -1; | |
894 | } | |
1da177e4 | 895 | |
bbdb7daf | 896 | if (!(hiddev = kzalloc(sizeof(struct hiddev), GFP_KERNEL))) |
1da177e4 | 897 | return -1; |
1da177e4 | 898 | |
1da177e4 | 899 | init_waitqueue_head(&hiddev->wait); |
826d5982 | 900 | INIT_LIST_HEAD(&hiddev->list); |
cdcb44e8 | 901 | spin_lock_init(&hiddev->list_lock); |
07903407 | 902 | mutex_init(&hiddev->existancelock); |
76052749 | 903 | hid->hiddev = hiddev; |
1da177e4 LT |
904 | hiddev->hid = hid; |
905 | hiddev->exist = 1; | |
07903407 ON |
906 | retval = usb_register_dev(usbhid->intf, &hiddev_class); |
907 | if (retval) { | |
4291ee30 | 908 | hid_err(hid, "Not able to get a minor for this device\n"); |
76052749 | 909 | hid->hiddev = NULL; |
07903407 ON |
910 | kfree(hiddev); |
911 | return -1; | |
07903407 | 912 | } |
1da177e4 LT |
913 | return 0; |
914 | } | |
915 | ||
916 | /* | |
917 | * This is where hid.c calls us to disconnect a hiddev device from the | |
918 | * corresponding hid device (usually because the usb device has disconnected) | |
919 | */ | |
920 | static struct usb_class_driver hiddev_class; | |
921 | void hiddev_disconnect(struct hid_device *hid) | |
922 | { | |
923 | struct hiddev *hiddev = hid->hiddev; | |
4916b3a5 | 924 | struct usbhid_device *usbhid = hid->driver_data; |
1da177e4 | 925 | |
ba18311d ML |
926 | usb_deregister_dev(usbhid->intf, &hiddev_class); |
927 | ||
07903407 | 928 | mutex_lock(&hiddev->existancelock); |
1da177e4 LT |
929 | hiddev->exist = 0; |
930 | ||
1da177e4 | 931 | if (hiddev->open) { |
7f77897e | 932 | mutex_unlock(&hiddev->existancelock); |
4916b3a5 | 933 | usbhid_close(hiddev->hid); |
1da177e4 LT |
934 | wake_up_interruptible(&hiddev->wait); |
935 | } else { | |
7f77897e | 936 | mutex_unlock(&hiddev->existancelock); |
1da177e4 LT |
937 | kfree(hiddev); |
938 | } | |
939 | } |