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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> | |
32 | #include <linux/smp_lock.h> | |
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> |
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 | |
47 | #define HIDDEV_BUFFER_SIZE 64 | |
48 | ||
49 | struct hiddev { | |
50 | int exist; | |
51 | int open; | |
52 | wait_queue_head_t wait; | |
53 | struct hid_device *hid; | |
826d5982 | 54 | struct list_head list; |
cdcb44e8 | 55 | spinlock_t list_lock; |
1da177e4 LT |
56 | }; |
57 | ||
58 | struct hiddev_list { | |
59 | struct hiddev_usage_ref buffer[HIDDEV_BUFFER_SIZE]; | |
60 | int head; | |
61 | int tail; | |
62 | unsigned flags; | |
63 | struct fasync_struct *fasync; | |
64 | struct hiddev *hiddev; | |
826d5982 | 65 | struct list_head node; |
1da177e4 LT |
66 | }; |
67 | ||
68 | static struct hiddev *hiddev_table[HIDDEV_MINORS]; | |
69 | ||
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 | { | |
228 | int retval; | |
229 | struct hiddev_list *list = file->private_data; | |
826d5982 | 230 | |
1da177e4 | 231 | retval = fasync_helper(fd, file, on, &list->fasync); |
826d5982 | 232 | |
1da177e4 LT |
233 | return retval < 0 ? retval : 0; |
234 | } | |
235 | ||
236 | ||
237 | /* | |
238 | * release file op | |
239 | */ | |
240 | static int hiddev_release(struct inode * inode, struct file * file) | |
241 | { | |
242 | struct hiddev_list *list = file->private_data; | |
cdcb44e8 | 243 | unsigned long flags; |
1da177e4 | 244 | |
1da177e4 | 245 | hiddev_fasync(-1, file, 0); |
cdcb44e8 JK |
246 | |
247 | spin_lock_irqsave(&list->hiddev->list_lock, flags); | |
826d5982 | 248 | list_del(&list->node); |
cdcb44e8 | 249 | spin_unlock_irqrestore(&list->hiddev->list_lock, flags); |
1da177e4 LT |
250 | |
251 | if (!--list->hiddev->open) { | |
05f091ab | 252 | if (list->hiddev->exist) |
4916b3a5 | 253 | usbhid_close(list->hiddev->hid); |
1da177e4 LT |
254 | else |
255 | kfree(list->hiddev); | |
256 | } | |
257 | ||
258 | kfree(list); | |
259 | ||
260 | return 0; | |
261 | } | |
262 | ||
263 | /* | |
264 | * open file op | |
265 | */ | |
826d5982 DT |
266 | static int hiddev_open(struct inode *inode, struct file *file) |
267 | { | |
1da177e4 | 268 | struct hiddev_list *list; |
cdcb44e8 | 269 | unsigned long flags; |
1da177e4 LT |
270 | |
271 | int i = iminor(inode) - HIDDEV_MINOR_BASE; | |
272 | ||
273 | if (i >= HIDDEV_MINORS || !hiddev_table[i]) | |
274 | return -ENODEV; | |
275 | ||
bbdb7daf | 276 | if (!(list = kzalloc(sizeof(struct hiddev_list), GFP_KERNEL))) |
1da177e4 | 277 | return -ENOMEM; |
1da177e4 LT |
278 | |
279 | list->hiddev = hiddev_table[i]; | |
cdcb44e8 JK |
280 | |
281 | spin_lock_irqsave(&list->hiddev->list_lock, flags); | |
826d5982 | 282 | list_add_tail(&list->node, &hiddev_table[i]->list); |
cdcb44e8 JK |
283 | spin_unlock_irqrestore(&list->hiddev->list_lock, flags); |
284 | ||
1da177e4 LT |
285 | file->private_data = list; |
286 | ||
287 | if (!list->hiddev->open++) | |
288 | if (list->hiddev->exist) | |
4916b3a5 | 289 | usbhid_open(hiddev_table[i]->hid); |
1da177e4 LT |
290 | |
291 | return 0; | |
292 | } | |
293 | ||
294 | /* | |
295 | * "write" file op | |
296 | */ | |
297 | static ssize_t hiddev_write(struct file * file, const char __user * buffer, size_t count, loff_t *ppos) | |
298 | { | |
299 | return -EINVAL; | |
300 | } | |
301 | ||
302 | /* | |
303 | * "read" file op | |
304 | */ | |
305 | static ssize_t hiddev_read(struct file * file, char __user * buffer, size_t count, loff_t *ppos) | |
306 | { | |
307 | DECLARE_WAITQUEUE(wait, current); | |
308 | struct hiddev_list *list = file->private_data; | |
309 | int event_size; | |
310 | int retval = 0; | |
311 | ||
312 | event_size = ((list->flags & HIDDEV_FLAG_UREF) != 0) ? | |
313 | sizeof(struct hiddev_usage_ref) : sizeof(struct hiddev_event); | |
314 | ||
315 | if (count < event_size) | |
316 | return 0; | |
317 | ||
318 | while (retval == 0) { | |
319 | if (list->head == list->tail) { | |
320 | add_wait_queue(&list->hiddev->wait, &wait); | |
321 | set_current_state(TASK_INTERRUPTIBLE); | |
05f091ab | 322 | |
1da177e4 LT |
323 | while (list->head == list->tail) { |
324 | if (file->f_flags & O_NONBLOCK) { | |
325 | retval = -EAGAIN; | |
326 | break; | |
327 | } | |
328 | if (signal_pending(current)) { | |
329 | retval = -ERESTARTSYS; | |
330 | break; | |
331 | } | |
332 | if (!list->hiddev->exist) { | |
333 | retval = -EIO; | |
334 | break; | |
335 | } | |
05f091ab | 336 | |
1da177e4 | 337 | schedule(); |
48d70552 | 338 | set_current_state(TASK_INTERRUPTIBLE); |
1da177e4 LT |
339 | } |
340 | ||
341 | set_current_state(TASK_RUNNING); | |
342 | remove_wait_queue(&list->hiddev->wait, &wait); | |
343 | } | |
344 | ||
345 | if (retval) | |
346 | return retval; | |
347 | ||
348 | ||
05f091ab | 349 | while (list->head != list->tail && |
1da177e4 LT |
350 | retval + event_size <= count) { |
351 | if ((list->flags & HIDDEV_FLAG_UREF) == 0) { | |
352 | if (list->buffer[list->tail].field_index != | |
353 | HID_FIELD_INDEX_NONE) { | |
354 | struct hiddev_event event; | |
355 | event.hid = list->buffer[list->tail].usage_code; | |
356 | event.value = list->buffer[list->tail].value; | |
357 | if (copy_to_user(buffer + retval, &event, sizeof(struct hiddev_event))) | |
358 | return -EFAULT; | |
359 | retval += sizeof(struct hiddev_event); | |
360 | } | |
361 | } else { | |
362 | if (list->buffer[list->tail].field_index != HID_FIELD_INDEX_NONE || | |
363 | (list->flags & HIDDEV_FLAG_REPORT) != 0) { | |
364 | if (copy_to_user(buffer + retval, list->buffer + list->tail, sizeof(struct hiddev_usage_ref))) | |
365 | return -EFAULT; | |
366 | retval += sizeof(struct hiddev_usage_ref); | |
367 | } | |
368 | } | |
369 | list->tail = (list->tail + 1) & (HIDDEV_BUFFER_SIZE - 1); | |
370 | } | |
371 | ||
372 | } | |
373 | ||
374 | return retval; | |
375 | } | |
376 | ||
377 | /* | |
378 | * "poll" file op | |
379 | * No kernel lock - fine | |
380 | */ | |
381 | static unsigned int hiddev_poll(struct file *file, poll_table *wait) | |
382 | { | |
383 | struct hiddev_list *list = file->private_data; | |
826d5982 | 384 | |
1da177e4 LT |
385 | poll_wait(file, &list->hiddev->wait, wait); |
386 | if (list->head != list->tail) | |
387 | return POLLIN | POLLRDNORM; | |
388 | if (!list->hiddev->exist) | |
389 | return POLLERR | POLLHUP; | |
390 | return 0; | |
391 | } | |
392 | ||
393 | /* | |
394 | * "ioctl" file op | |
395 | */ | |
396 | static int hiddev_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) | |
397 | { | |
398 | struct hiddev_list *list = file->private_data; | |
399 | struct hiddev *hiddev = list->hiddev; | |
400 | struct hid_device *hid = hiddev->hid; | |
be820975 | 401 | struct usb_device *dev = hid_to_usb_dev(hid); |
1da177e4 LT |
402 | struct hiddev_collection_info cinfo; |
403 | struct hiddev_report_info rinfo; | |
404 | struct hiddev_field_info finfo; | |
826d5982 | 405 | struct hiddev_usage_ref_multi *uref_multi = NULL; |
1da177e4 LT |
406 | struct hiddev_usage_ref *uref; |
407 | struct hiddev_devinfo dinfo; | |
408 | struct hid_report *report; | |
409 | struct hid_field *field; | |
4916b3a5 | 410 | struct usbhid_device *usbhid = hid->driver_data; |
1da177e4 LT |
411 | void __user *user_arg = (void __user *)arg; |
412 | int i; | |
413 | ||
414 | if (!hiddev->exist) | |
415 | return -EIO; | |
416 | ||
417 | switch (cmd) { | |
418 | ||
419 | case HIDIOCGVERSION: | |
420 | return put_user(HID_VERSION, (int __user *)arg); | |
421 | ||
422 | case HIDIOCAPPLICATION: | |
423 | if (arg < 0 || arg >= hid->maxapplication) | |
424 | return -EINVAL; | |
425 | ||
426 | for (i = 0; i < hid->maxcollection; i++) | |
05f091ab | 427 | if (hid->collection[i].type == |
1da177e4 LT |
428 | HID_COLLECTION_APPLICATION && arg-- == 0) |
429 | break; | |
05f091ab | 430 | |
1da177e4 LT |
431 | if (i == hid->maxcollection) |
432 | return -EINVAL; | |
433 | ||
434 | return hid->collection[i].usage; | |
435 | ||
436 | case HIDIOCGDEVINFO: | |
437 | dinfo.bustype = BUS_USB; | |
438 | dinfo.busnum = dev->bus->busnum; | |
439 | dinfo.devnum = dev->devnum; | |
4916b3a5 | 440 | dinfo.ifnum = usbhid->ifnum; |
1da177e4 LT |
441 | dinfo.vendor = le16_to_cpu(dev->descriptor.idVendor); |
442 | dinfo.product = le16_to_cpu(dev->descriptor.idProduct); | |
443 | dinfo.version = le16_to_cpu(dev->descriptor.bcdDevice); | |
444 | dinfo.num_applications = hid->maxapplication; | |
445 | if (copy_to_user(user_arg, &dinfo, sizeof(dinfo))) | |
446 | return -EFAULT; | |
447 | ||
448 | return 0; | |
449 | ||
450 | case HIDIOCGFLAG: | |
451 | if (put_user(list->flags, (int __user *)arg)) | |
452 | return -EFAULT; | |
453 | ||
454 | return 0; | |
455 | ||
456 | case HIDIOCSFLAG: | |
457 | { | |
458 | int newflags; | |
459 | if (get_user(newflags, (int __user *)arg)) | |
460 | return -EFAULT; | |
461 | ||
462 | if ((newflags & ~HIDDEV_FLAGS) != 0 || | |
463 | ((newflags & HIDDEV_FLAG_REPORT) != 0 && | |
464 | (newflags & HIDDEV_FLAG_UREF) == 0)) | |
465 | return -EINVAL; | |
466 | ||
467 | list->flags = newflags; | |
468 | ||
469 | return 0; | |
470 | } | |
471 | ||
472 | case HIDIOCGSTRING: | |
473 | { | |
474 | int idx, len; | |
475 | char *buf; | |
476 | ||
477 | if (get_user(idx, (int __user *)arg)) | |
478 | return -EFAULT; | |
479 | ||
480 | if ((buf = kmalloc(HID_STRING_SIZE, GFP_KERNEL)) == NULL) | |
481 | return -ENOMEM; | |
482 | ||
483 | if ((len = usb_string(dev, idx, buf, HID_STRING_SIZE-1)) < 0) { | |
484 | kfree(buf); | |
485 | return -EINVAL; | |
486 | } | |
487 | ||
488 | if (copy_to_user(user_arg+sizeof(int), buf, len+1)) { | |
489 | kfree(buf); | |
490 | return -EFAULT; | |
491 | } | |
492 | ||
493 | kfree(buf); | |
494 | ||
495 | return len; | |
496 | } | |
497 | ||
498 | case HIDIOCINITREPORT: | |
4916b3a5 | 499 | usbhid_init_reports(hid); |
1da177e4 LT |
500 | |
501 | return 0; | |
502 | ||
503 | case HIDIOCGREPORT: | |
504 | if (copy_from_user(&rinfo, user_arg, sizeof(rinfo))) | |
505 | return -EFAULT; | |
506 | ||
507 | if (rinfo.report_type == HID_REPORT_TYPE_OUTPUT) | |
508 | return -EINVAL; | |
509 | ||
510 | if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL) | |
511 | return -EINVAL; | |
512 | ||
4916b3a5 JK |
513 | usbhid_submit_report(hid, report, USB_DIR_IN); |
514 | usbhid_wait_io(hid); | |
1da177e4 LT |
515 | |
516 | return 0; | |
517 | ||
518 | case HIDIOCSREPORT: | |
519 | if (copy_from_user(&rinfo, user_arg, sizeof(rinfo))) | |
520 | return -EFAULT; | |
521 | ||
522 | if (rinfo.report_type == HID_REPORT_TYPE_INPUT) | |
523 | return -EINVAL; | |
524 | ||
525 | if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL) | |
526 | return -EINVAL; | |
527 | ||
4916b3a5 JK |
528 | usbhid_submit_report(hid, report, USB_DIR_OUT); |
529 | usbhid_wait_io(hid); | |
1da177e4 LT |
530 | |
531 | return 0; | |
532 | ||
533 | case HIDIOCGREPORTINFO: | |
534 | if (copy_from_user(&rinfo, user_arg, sizeof(rinfo))) | |
535 | return -EFAULT; | |
536 | ||
537 | if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL) | |
538 | return -EINVAL; | |
539 | ||
540 | rinfo.num_fields = report->maxfield; | |
541 | ||
542 | if (copy_to_user(user_arg, &rinfo, sizeof(rinfo))) | |
543 | return -EFAULT; | |
544 | ||
545 | return 0; | |
546 | ||
547 | case HIDIOCGFIELDINFO: | |
548 | if (copy_from_user(&finfo, user_arg, sizeof(finfo))) | |
549 | return -EFAULT; | |
550 | rinfo.report_type = finfo.report_type; | |
551 | rinfo.report_id = finfo.report_id; | |
552 | if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL) | |
553 | return -EINVAL; | |
554 | ||
555 | if (finfo.field_index >= report->maxfield) | |
556 | return -EINVAL; | |
557 | ||
558 | field = report->field[finfo.field_index]; | |
559 | memset(&finfo, 0, sizeof(finfo)); | |
560 | finfo.report_type = rinfo.report_type; | |
561 | finfo.report_id = rinfo.report_id; | |
562 | finfo.field_index = field->report_count - 1; | |
563 | finfo.maxusage = field->maxusage; | |
564 | finfo.flags = field->flags; | |
565 | finfo.physical = field->physical; | |
566 | finfo.logical = field->logical; | |
567 | finfo.application = field->application; | |
568 | finfo.logical_minimum = field->logical_minimum; | |
569 | finfo.logical_maximum = field->logical_maximum; | |
570 | finfo.physical_minimum = field->physical_minimum; | |
571 | finfo.physical_maximum = field->physical_maximum; | |
572 | finfo.unit_exponent = field->unit_exponent; | |
573 | finfo.unit = field->unit; | |
574 | ||
575 | if (copy_to_user(user_arg, &finfo, sizeof(finfo))) | |
576 | return -EFAULT; | |
577 | ||
578 | return 0; | |
579 | ||
580 | case HIDIOCGUCODE: | |
581 | uref_multi = kmalloc(sizeof(struct hiddev_usage_ref_multi), GFP_KERNEL); | |
582 | if (!uref_multi) | |
583 | return -ENOMEM; | |
584 | uref = &uref_multi->uref; | |
05f091ab | 585 | if (copy_from_user(uref, user_arg, sizeof(*uref))) |
1da177e4 LT |
586 | goto fault; |
587 | ||
588 | rinfo.report_type = uref->report_type; | |
589 | rinfo.report_id = uref->report_id; | |
590 | if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL) | |
591 | goto inval; | |
592 | ||
593 | if (uref->field_index >= report->maxfield) | |
594 | goto inval; | |
595 | ||
596 | field = report->field[uref->field_index]; | |
597 | if (uref->usage_index >= field->maxusage) | |
598 | goto inval; | |
599 | ||
600 | uref->usage_code = field->usage[uref->usage_index].hid; | |
601 | ||
602 | if (copy_to_user(user_arg, uref, sizeof(*uref))) | |
603 | goto fault; | |
604 | ||
605 | kfree(uref_multi); | |
606 | return 0; | |
607 | ||
608 | case HIDIOCGUSAGE: | |
609 | case HIDIOCSUSAGE: | |
610 | case HIDIOCGUSAGES: | |
611 | case HIDIOCSUSAGES: | |
612 | case HIDIOCGCOLLECTIONINDEX: | |
613 | uref_multi = kmalloc(sizeof(struct hiddev_usage_ref_multi), GFP_KERNEL); | |
614 | if (!uref_multi) | |
615 | return -ENOMEM; | |
616 | uref = &uref_multi->uref; | |
617 | if (cmd == HIDIOCGUSAGES || cmd == HIDIOCSUSAGES) { | |
05f091ab | 618 | if (copy_from_user(uref_multi, user_arg, |
1da177e4 LT |
619 | sizeof(*uref_multi))) |
620 | goto fault; | |
621 | } else { | |
622 | if (copy_from_user(uref, user_arg, sizeof(*uref))) | |
623 | goto fault; | |
624 | } | |
625 | ||
05f091ab | 626 | if (cmd != HIDIOCGUSAGE && |
1da177e4 LT |
627 | cmd != HIDIOCGUSAGES && |
628 | uref->report_type == HID_REPORT_TYPE_INPUT) | |
629 | goto inval; | |
630 | ||
631 | if (uref->report_id == HID_REPORT_ID_UNKNOWN) { | |
632 | field = hiddev_lookup_usage(hid, uref); | |
633 | if (field == NULL) | |
634 | goto inval; | |
635 | } else { | |
636 | rinfo.report_type = uref->report_type; | |
637 | rinfo.report_id = uref->report_id; | |
638 | if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL) | |
639 | goto inval; | |
640 | ||
641 | if (uref->field_index >= report->maxfield) | |
642 | goto inval; | |
643 | ||
644 | field = report->field[uref->field_index]; | |
645 | ||
646 | if (cmd == HIDIOCGCOLLECTIONINDEX) { | |
647 | if (uref->usage_index >= field->maxusage) | |
648 | goto inval; | |
649 | } else if (uref->usage_index >= field->report_count) | |
650 | goto inval; | |
651 | ||
652 | else if ((cmd == HIDIOCGUSAGES || cmd == HIDIOCSUSAGES) && | |
653 | (uref_multi->num_values > HID_MAX_MULTI_USAGES || | |
6dea9347 | 654 | uref->usage_index + uref_multi->num_values > field->report_count)) |
1da177e4 LT |
655 | goto inval; |
656 | } | |
657 | ||
658 | switch (cmd) { | |
659 | case HIDIOCGUSAGE: | |
660 | uref->value = field->value[uref->usage_index]; | |
661 | if (copy_to_user(user_arg, uref, sizeof(*uref))) | |
662 | goto fault; | |
663 | goto goodreturn; | |
664 | ||
665 | case HIDIOCSUSAGE: | |
666 | field->value[uref->usage_index] = uref->value; | |
667 | goto goodreturn; | |
668 | ||
669 | case HIDIOCGCOLLECTIONINDEX: | |
670 | kfree(uref_multi); | |
671 | return field->usage[uref->usage_index].collection_index; | |
672 | case HIDIOCGUSAGES: | |
673 | for (i = 0; i < uref_multi->num_values; i++) | |
05f091ab | 674 | uref_multi->values[i] = |
1da177e4 | 675 | field->value[uref->usage_index + i]; |
05f091ab | 676 | if (copy_to_user(user_arg, uref_multi, |
1da177e4 LT |
677 | sizeof(*uref_multi))) |
678 | goto fault; | |
679 | goto goodreturn; | |
680 | case HIDIOCSUSAGES: | |
681 | for (i = 0; i < uref_multi->num_values; i++) | |
05f091ab DT |
682 | field->value[uref->usage_index + i] = |
683 | uref_multi->values[i]; | |
1da177e4 LT |
684 | goto goodreturn; |
685 | } | |
686 | ||
687 | goodreturn: | |
688 | kfree(uref_multi); | |
689 | return 0; | |
690 | fault: | |
691 | kfree(uref_multi); | |
692 | return -EFAULT; | |
05f091ab | 693 | inval: |
1da177e4 LT |
694 | kfree(uref_multi); |
695 | return -EINVAL; | |
696 | ||
697 | case HIDIOCGCOLLECTIONINFO: | |
698 | if (copy_from_user(&cinfo, user_arg, sizeof(cinfo))) | |
699 | return -EFAULT; | |
700 | ||
701 | if (cinfo.index >= hid->maxcollection) | |
702 | return -EINVAL; | |
703 | ||
704 | cinfo.type = hid->collection[cinfo.index].type; | |
705 | cinfo.usage = hid->collection[cinfo.index].usage; | |
706 | cinfo.level = hid->collection[cinfo.index].level; | |
707 | ||
708 | if (copy_to_user(user_arg, &cinfo, sizeof(cinfo))) | |
709 | return -EFAULT; | |
710 | return 0; | |
711 | ||
712 | default: | |
713 | ||
714 | if (_IOC_TYPE(cmd) != 'H' || _IOC_DIR(cmd) != _IOC_READ) | |
715 | return -EINVAL; | |
716 | ||
717 | if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGNAME(0))) { | |
718 | int len; | |
719 | if (!hid->name) | |
720 | return 0; | |
721 | len = strlen(hid->name) + 1; | |
722 | if (len > _IOC_SIZE(cmd)) | |
723 | len = _IOC_SIZE(cmd); | |
724 | return copy_to_user(user_arg, hid->name, len) ? | |
725 | -EFAULT : len; | |
726 | } | |
727 | ||
728 | if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGPHYS(0))) { | |
729 | int len; | |
730 | if (!hid->phys) | |
731 | return 0; | |
732 | len = strlen(hid->phys) + 1; | |
733 | if (len > _IOC_SIZE(cmd)) | |
734 | len = _IOC_SIZE(cmd); | |
735 | return copy_to_user(user_arg, hid->phys, len) ? | |
736 | -EFAULT : len; | |
737 | } | |
738 | } | |
739 | return -EINVAL; | |
740 | } | |
741 | ||
bb6c8d8f PL |
742 | #ifdef CONFIG_COMPAT |
743 | static long hiddev_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
744 | { | |
745 | struct inode *inode = file->f_path.dentry->d_inode; | |
d624284b | 746 | return hiddev_ioctl(inode, file, cmd, (unsigned long)compat_ptr(arg)); |
bb6c8d8f PL |
747 | } |
748 | #endif | |
749 | ||
066202dd | 750 | static const struct file_operations hiddev_fops = { |
1da177e4 LT |
751 | .owner = THIS_MODULE, |
752 | .read = hiddev_read, | |
753 | .write = hiddev_write, | |
754 | .poll = hiddev_poll, | |
755 | .open = hiddev_open, | |
756 | .release = hiddev_release, | |
757 | .ioctl = hiddev_ioctl, | |
758 | .fasync = hiddev_fasync, | |
bb6c8d8f PL |
759 | #ifdef CONFIG_COMPAT |
760 | .compat_ioctl = hiddev_compat_ioctl, | |
761 | #endif | |
1da177e4 LT |
762 | }; |
763 | ||
764 | static struct usb_class_driver hiddev_class = { | |
d6e5bcf4 | 765 | .name = "hiddev%d", |
1da177e4 | 766 | .fops = &hiddev_fops, |
05f091ab | 767 | .minor_base = HIDDEV_MINOR_BASE, |
1da177e4 LT |
768 | }; |
769 | ||
770 | /* | |
771 | * This is where hid.c calls us to connect a hid device to the hiddev driver | |
772 | */ | |
773 | int hiddev_connect(struct hid_device *hid) | |
774 | { | |
775 | struct hiddev *hiddev; | |
4916b3a5 | 776 | struct usbhid_device *usbhid = hid->driver_data; |
1da177e4 LT |
777 | int i; |
778 | int retval; | |
779 | ||
780 | for (i = 0; i < hid->maxcollection; i++) | |
05f091ab | 781 | if (hid->collection[i].type == |
1da177e4 LT |
782 | HID_COLLECTION_APPLICATION && |
783 | !IS_INPUT_APPLICATION(hid->collection[i].usage)) | |
784 | break; | |
785 | ||
786 | if (i == hid->maxcollection && (hid->quirks & HID_QUIRK_HIDDEV) == 0) | |
787 | return -1; | |
788 | ||
bbdb7daf | 789 | if (!(hiddev = kzalloc(sizeof(struct hiddev), GFP_KERNEL))) |
1da177e4 | 790 | return -1; |
1da177e4 | 791 | |
4916b3a5 | 792 | retval = usb_register_dev(usbhid->intf, &hiddev_class); |
1da177e4 | 793 | if (retval) { |
58037eb9 | 794 | err_hid("Not able to get a minor for this device."); |
1da177e4 LT |
795 | kfree(hiddev); |
796 | return -1; | |
797 | } | |
798 | ||
799 | init_waitqueue_head(&hiddev->wait); | |
826d5982 | 800 | INIT_LIST_HEAD(&hiddev->list); |
cdcb44e8 | 801 | spin_lock_init(&hiddev->list_lock); |
1da177e4 LT |
802 | hiddev->hid = hid; |
803 | hiddev->exist = 1; | |
804 | ||
4916b3a5 | 805 | hid->minor = usbhid->intf->minor; |
1da177e4 LT |
806 | hid->hiddev = hiddev; |
807 | ||
4916b3a5 | 808 | hiddev_table[usbhid->intf->minor - HIDDEV_MINOR_BASE] = hiddev; |
826d5982 | 809 | |
1da177e4 LT |
810 | return 0; |
811 | } | |
812 | ||
813 | /* | |
814 | * This is where hid.c calls us to disconnect a hiddev device from the | |
815 | * corresponding hid device (usually because the usb device has disconnected) | |
816 | */ | |
817 | static struct usb_class_driver hiddev_class; | |
818 | void hiddev_disconnect(struct hid_device *hid) | |
819 | { | |
820 | struct hiddev *hiddev = hid->hiddev; | |
4916b3a5 | 821 | struct usbhid_device *usbhid = hid->driver_data; |
1da177e4 LT |
822 | |
823 | hiddev->exist = 0; | |
824 | ||
825 | hiddev_table[hiddev->hid->minor - HIDDEV_MINOR_BASE] = NULL; | |
4916b3a5 | 826 | usb_deregister_dev(usbhid->intf, &hiddev_class); |
1da177e4 LT |
827 | |
828 | if (hiddev->open) { | |
4916b3a5 | 829 | usbhid_close(hiddev->hid); |
1da177e4 LT |
830 | wake_up_interruptible(&hiddev->wait); |
831 | } else { | |
832 | kfree(hiddev); | |
833 | } | |
834 | } | |
835 | ||
836 | /* Currently this driver is a USB driver. It's not a conventional one in | |
837 | * the sense that it doesn't probe at the USB level. Instead it waits to | |
838 | * be connected by HID through the hiddev_connect / hiddev_disconnect | |
839 | * routines. The reason to register as a USB device is to gain part of the | |
840 | * minor number space from the USB major. | |
841 | * | |
842 | * In theory, should the HID code be generalized to more than one physical | |
843 | * medium (say, IEEE 1384), this driver will probably need to register its | |
844 | * own major number, and in doing so, no longer need to register with USB. | |
845 | * At that point the probe routine and hiddev_driver struct below will no | |
846 | * longer be useful. | |
847 | */ | |
848 | ||
849 | ||
850 | /* We never attach in this manner, and rely on HID to connect us. This | |
851 | * is why there is no disconnect routine defined in the usb_driver either. | |
852 | */ | |
05f091ab | 853 | static int hiddev_usbd_probe(struct usb_interface *intf, |
1da177e4 LT |
854 | const struct usb_device_id *hiddev_info) |
855 | { | |
856 | return -ENODEV; | |
857 | } | |
858 | ||
859 | ||
860 | static /* const */ struct usb_driver hiddev_driver = { | |
1da177e4 LT |
861 | .name = "hiddev", |
862 | .probe = hiddev_usbd_probe, | |
863 | }; | |
864 | ||
865 | int __init hiddev_init(void) | |
866 | { | |
1da177e4 LT |
867 | return usb_register(&hiddev_driver); |
868 | } | |
869 | ||
870 | void hiddev_exit(void) | |
871 | { | |
872 | usb_deregister(&hiddev_driver); | |
1da177e4 | 873 | } |