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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> |
dde5845a | 37 | #include "usbhid.h" |
1da177e4 LT |
38 | |
39 | #ifdef CONFIG_USB_DYNAMIC_MINORS | |
40 | #define HIDDEV_MINOR_BASE 0 | |
41 | #define HIDDEV_MINORS 256 | |
42 | #else | |
43 | #define HIDDEV_MINOR_BASE 96 | |
44 | #define HIDDEV_MINORS 16 | |
45 | #endif | |
46 | #define HIDDEV_BUFFER_SIZE 64 | |
47 | ||
48 | struct hiddev { | |
49 | int exist; | |
50 | int open; | |
51 | wait_queue_head_t wait; | |
52 | struct hid_device *hid; | |
826d5982 | 53 | struct list_head list; |
1da177e4 LT |
54 | }; |
55 | ||
56 | struct hiddev_list { | |
57 | struct hiddev_usage_ref buffer[HIDDEV_BUFFER_SIZE]; | |
58 | int head; | |
59 | int tail; | |
60 | unsigned flags; | |
61 | struct fasync_struct *fasync; | |
62 | struct hiddev *hiddev; | |
826d5982 | 63 | struct list_head node; |
1da177e4 LT |
64 | }; |
65 | ||
66 | static struct hiddev *hiddev_table[HIDDEV_MINORS]; | |
67 | ||
68 | /* | |
69 | * Find a report, given the report's type and ID. The ID can be specified | |
70 | * indirectly by REPORT_ID_FIRST (which returns the first report of the given | |
71 | * type) or by (REPORT_ID_NEXT | old_id), which returns the next report of the | |
72 | * given type which follows old_id. | |
73 | */ | |
74 | static struct hid_report * | |
75 | hiddev_lookup_report(struct hid_device *hid, struct hiddev_report_info *rinfo) | |
76 | { | |
826d5982 DT |
77 | unsigned int flags = rinfo->report_id & ~HID_REPORT_ID_MASK; |
78 | unsigned int rid = rinfo->report_id & HID_REPORT_ID_MASK; | |
1da177e4 | 79 | struct hid_report_enum *report_enum; |
826d5982 | 80 | struct hid_report *report; |
1da177e4 LT |
81 | struct list_head *list; |
82 | ||
83 | if (rinfo->report_type < HID_REPORT_TYPE_MIN || | |
826d5982 DT |
84 | rinfo->report_type > HID_REPORT_TYPE_MAX) |
85 | return NULL; | |
1da177e4 LT |
86 | |
87 | report_enum = hid->report_enum + | |
88 | (rinfo->report_type - HID_REPORT_TYPE_MIN); | |
89 | ||
90 | switch (flags) { | |
91 | case 0: /* Nothing to do -- report_id is already set correctly */ | |
92 | break; | |
93 | ||
94 | case HID_REPORT_ID_FIRST: | |
826d5982 | 95 | if (list_empty(&report_enum->report_list)) |
1da177e4 | 96 | return NULL; |
826d5982 DT |
97 | |
98 | list = report_enum->report_list.next; | |
99 | report = list_entry(list, struct hid_report, list); | |
100 | rinfo->report_id = report->id; | |
1da177e4 | 101 | break; |
05f091ab | 102 | |
1da177e4 | 103 | case HID_REPORT_ID_NEXT: |
826d5982 DT |
104 | report = report_enum->report_id_hash[rid]; |
105 | if (!report) | |
1da177e4 | 106 | return NULL; |
826d5982 DT |
107 | |
108 | list = report->list.next; | |
1da177e4 LT |
109 | if (list == &report_enum->report_list) |
110 | return NULL; | |
826d5982 DT |
111 | |
112 | report = list_entry(list, struct hid_report, list); | |
113 | rinfo->report_id = report->id; | |
1da177e4 | 114 | break; |
05f091ab | 115 | |
1da177e4 LT |
116 | default: |
117 | return NULL; | |
118 | } | |
119 | ||
120 | return report_enum->report_id_hash[rinfo->report_id]; | |
121 | } | |
122 | ||
123 | /* | |
124 | * Perform an exhaustive search of the report table for a usage, given its | |
125 | * type and usage id. | |
126 | */ | |
127 | static struct hid_field * | |
128 | hiddev_lookup_usage(struct hid_device *hid, struct hiddev_usage_ref *uref) | |
129 | { | |
130 | int i, j; | |
131 | struct hid_report *report; | |
132 | struct hid_report_enum *report_enum; | |
133 | struct hid_field *field; | |
134 | ||
135 | if (uref->report_type < HID_REPORT_TYPE_MIN || | |
826d5982 DT |
136 | uref->report_type > HID_REPORT_TYPE_MAX) |
137 | return NULL; | |
1da177e4 LT |
138 | |
139 | report_enum = hid->report_enum + | |
140 | (uref->report_type - HID_REPORT_TYPE_MIN); | |
141 | ||
826d5982 | 142 | list_for_each_entry(report, &report_enum->report_list, list) { |
1da177e4 LT |
143 | for (i = 0; i < report->maxfield; i++) { |
144 | field = report->field[i]; | |
145 | for (j = 0; j < field->maxusage; j++) { | |
146 | if (field->usage[j].hid == uref->usage_code) { | |
147 | uref->report_id = report->id; | |
148 | uref->field_index = i; | |
149 | uref->usage_index = j; | |
150 | return field; | |
151 | } | |
152 | } | |
153 | } | |
826d5982 | 154 | } |
1da177e4 LT |
155 | |
156 | return NULL; | |
157 | } | |
158 | ||
159 | static void hiddev_send_event(struct hid_device *hid, | |
160 | struct hiddev_usage_ref *uref) | |
161 | { | |
162 | struct hiddev *hiddev = hid->hiddev; | |
826d5982 | 163 | struct hiddev_list *list; |
1da177e4 | 164 | |
826d5982 | 165 | list_for_each_entry(list, &hiddev->list, node) { |
1da177e4 LT |
166 | if (uref->field_index != HID_FIELD_INDEX_NONE || |
167 | (list->flags & HIDDEV_FLAG_REPORT) != 0) { | |
168 | list->buffer[list->head] = *uref; | |
05f091ab | 169 | list->head = (list->head + 1) & |
1da177e4 LT |
170 | (HIDDEV_BUFFER_SIZE - 1); |
171 | kill_fasync(&list->fasync, SIGIO, POLL_IN); | |
172 | } | |
1da177e4 LT |
173 | } |
174 | ||
175 | wake_up_interruptible(&hiddev->wait); | |
176 | } | |
177 | ||
178 | /* | |
179 | * This is where hid.c calls into hiddev to pass an event that occurred over | |
180 | * the interrupt pipe | |
181 | */ | |
182 | void hiddev_hid_event(struct hid_device *hid, struct hid_field *field, | |
7d12e780 | 183 | struct hid_usage *usage, __s32 value) |
1da177e4 LT |
184 | { |
185 | unsigned type = field->report_type; | |
186 | struct hiddev_usage_ref uref; | |
187 | ||
05f091ab | 188 | uref.report_type = |
1da177e4 | 189 | (type == HID_INPUT_REPORT) ? HID_REPORT_TYPE_INPUT : |
05f091ab | 190 | ((type == HID_OUTPUT_REPORT) ? HID_REPORT_TYPE_OUTPUT : |
826d5982 | 191 | ((type == HID_FEATURE_REPORT) ? HID_REPORT_TYPE_FEATURE : 0)); |
1da177e4 LT |
192 | uref.report_id = field->report->id; |
193 | uref.field_index = field->index; | |
194 | uref.usage_index = (usage - field->usage); | |
195 | uref.usage_code = usage->hid; | |
196 | uref.value = value; | |
197 | ||
198 | hiddev_send_event(hid, &uref); | |
199 | } | |
229695e5 | 200 | EXPORT_SYMBOL_GPL(hiddev_hid_event); |
1da177e4 LT |
201 | |
202 | void hiddev_report_event(struct hid_device *hid, struct hid_report *report) | |
203 | { | |
204 | unsigned type = report->type; | |
205 | struct hiddev_usage_ref uref; | |
206 | ||
207 | memset(&uref, 0, sizeof(uref)); | |
05f091ab | 208 | uref.report_type = |
1da177e4 | 209 | (type == HID_INPUT_REPORT) ? HID_REPORT_TYPE_INPUT : |
05f091ab | 210 | ((type == HID_OUTPUT_REPORT) ? HID_REPORT_TYPE_OUTPUT : |
826d5982 | 211 | ((type == HID_FEATURE_REPORT) ? HID_REPORT_TYPE_FEATURE : 0)); |
1da177e4 LT |
212 | uref.report_id = report->id; |
213 | uref.field_index = HID_FIELD_INDEX_NONE; | |
214 | ||
215 | hiddev_send_event(hid, &uref); | |
216 | } | |
217 | /* | |
218 | * fasync file op | |
219 | */ | |
220 | static int hiddev_fasync(int fd, struct file *file, int on) | |
221 | { | |
222 | int retval; | |
223 | struct hiddev_list *list = file->private_data; | |
826d5982 | 224 | |
1da177e4 | 225 | retval = fasync_helper(fd, file, on, &list->fasync); |
826d5982 | 226 | |
1da177e4 LT |
227 | return retval < 0 ? retval : 0; |
228 | } | |
229 | ||
230 | ||
231 | /* | |
232 | * release file op | |
233 | */ | |
234 | static int hiddev_release(struct inode * inode, struct file * file) | |
235 | { | |
236 | struct hiddev_list *list = file->private_data; | |
1da177e4 | 237 | |
1da177e4 | 238 | hiddev_fasync(-1, file, 0); |
826d5982 | 239 | list_del(&list->node); |
1da177e4 LT |
240 | |
241 | if (!--list->hiddev->open) { | |
05f091ab | 242 | if (list->hiddev->exist) |
4916b3a5 | 243 | usbhid_close(list->hiddev->hid); |
1da177e4 LT |
244 | else |
245 | kfree(list->hiddev); | |
246 | } | |
247 | ||
248 | kfree(list); | |
249 | ||
250 | return 0; | |
251 | } | |
252 | ||
253 | /* | |
254 | * open file op | |
255 | */ | |
826d5982 DT |
256 | static int hiddev_open(struct inode *inode, struct file *file) |
257 | { | |
1da177e4 LT |
258 | struct hiddev_list *list; |
259 | ||
260 | int i = iminor(inode) - HIDDEV_MINOR_BASE; | |
261 | ||
262 | if (i >= HIDDEV_MINORS || !hiddev_table[i]) | |
263 | return -ENODEV; | |
264 | ||
bbdb7daf | 265 | if (!(list = kzalloc(sizeof(struct hiddev_list), GFP_KERNEL))) |
1da177e4 | 266 | return -ENOMEM; |
1da177e4 LT |
267 | |
268 | list->hiddev = hiddev_table[i]; | |
826d5982 | 269 | list_add_tail(&list->node, &hiddev_table[i]->list); |
1da177e4 LT |
270 | file->private_data = list; |
271 | ||
272 | if (!list->hiddev->open++) | |
273 | if (list->hiddev->exist) | |
4916b3a5 | 274 | usbhid_open(hiddev_table[i]->hid); |
1da177e4 LT |
275 | |
276 | return 0; | |
277 | } | |
278 | ||
279 | /* | |
280 | * "write" file op | |
281 | */ | |
282 | static ssize_t hiddev_write(struct file * file, const char __user * buffer, size_t count, loff_t *ppos) | |
283 | { | |
284 | return -EINVAL; | |
285 | } | |
286 | ||
287 | /* | |
288 | * "read" file op | |
289 | */ | |
290 | static ssize_t hiddev_read(struct file * file, char __user * buffer, size_t count, loff_t *ppos) | |
291 | { | |
292 | DECLARE_WAITQUEUE(wait, current); | |
293 | struct hiddev_list *list = file->private_data; | |
294 | int event_size; | |
295 | int retval = 0; | |
296 | ||
297 | event_size = ((list->flags & HIDDEV_FLAG_UREF) != 0) ? | |
298 | sizeof(struct hiddev_usage_ref) : sizeof(struct hiddev_event); | |
299 | ||
300 | if (count < event_size) | |
301 | return 0; | |
302 | ||
303 | while (retval == 0) { | |
304 | if (list->head == list->tail) { | |
305 | add_wait_queue(&list->hiddev->wait, &wait); | |
306 | set_current_state(TASK_INTERRUPTIBLE); | |
05f091ab | 307 | |
1da177e4 LT |
308 | while (list->head == list->tail) { |
309 | if (file->f_flags & O_NONBLOCK) { | |
310 | retval = -EAGAIN; | |
311 | break; | |
312 | } | |
313 | if (signal_pending(current)) { | |
314 | retval = -ERESTARTSYS; | |
315 | break; | |
316 | } | |
317 | if (!list->hiddev->exist) { | |
318 | retval = -EIO; | |
319 | break; | |
320 | } | |
05f091ab | 321 | |
1da177e4 | 322 | schedule(); |
48d70552 | 323 | set_current_state(TASK_INTERRUPTIBLE); |
1da177e4 LT |
324 | } |
325 | ||
326 | set_current_state(TASK_RUNNING); | |
327 | remove_wait_queue(&list->hiddev->wait, &wait); | |
328 | } | |
329 | ||
330 | if (retval) | |
331 | return retval; | |
332 | ||
333 | ||
05f091ab | 334 | while (list->head != list->tail && |
1da177e4 LT |
335 | retval + event_size <= count) { |
336 | if ((list->flags & HIDDEV_FLAG_UREF) == 0) { | |
337 | if (list->buffer[list->tail].field_index != | |
338 | HID_FIELD_INDEX_NONE) { | |
339 | struct hiddev_event event; | |
340 | event.hid = list->buffer[list->tail].usage_code; | |
341 | event.value = list->buffer[list->tail].value; | |
342 | if (copy_to_user(buffer + retval, &event, sizeof(struct hiddev_event))) | |
343 | return -EFAULT; | |
344 | retval += sizeof(struct hiddev_event); | |
345 | } | |
346 | } else { | |
347 | if (list->buffer[list->tail].field_index != HID_FIELD_INDEX_NONE || | |
348 | (list->flags & HIDDEV_FLAG_REPORT) != 0) { | |
349 | if (copy_to_user(buffer + retval, list->buffer + list->tail, sizeof(struct hiddev_usage_ref))) | |
350 | return -EFAULT; | |
351 | retval += sizeof(struct hiddev_usage_ref); | |
352 | } | |
353 | } | |
354 | list->tail = (list->tail + 1) & (HIDDEV_BUFFER_SIZE - 1); | |
355 | } | |
356 | ||
357 | } | |
358 | ||
359 | return retval; | |
360 | } | |
361 | ||
362 | /* | |
363 | * "poll" file op | |
364 | * No kernel lock - fine | |
365 | */ | |
366 | static unsigned int hiddev_poll(struct file *file, poll_table *wait) | |
367 | { | |
368 | struct hiddev_list *list = file->private_data; | |
826d5982 | 369 | |
1da177e4 LT |
370 | poll_wait(file, &list->hiddev->wait, wait); |
371 | if (list->head != list->tail) | |
372 | return POLLIN | POLLRDNORM; | |
373 | if (!list->hiddev->exist) | |
374 | return POLLERR | POLLHUP; | |
375 | return 0; | |
376 | } | |
377 | ||
378 | /* | |
379 | * "ioctl" file op | |
380 | */ | |
381 | static int hiddev_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) | |
382 | { | |
383 | struct hiddev_list *list = file->private_data; | |
384 | struct hiddev *hiddev = list->hiddev; | |
385 | struct hid_device *hid = hiddev->hid; | |
4916b3a5 | 386 | struct usb_device *dev = to_usb_device(hid->dev); |
1da177e4 LT |
387 | struct hiddev_collection_info cinfo; |
388 | struct hiddev_report_info rinfo; | |
389 | struct hiddev_field_info finfo; | |
826d5982 | 390 | struct hiddev_usage_ref_multi *uref_multi = NULL; |
1da177e4 LT |
391 | struct hiddev_usage_ref *uref; |
392 | struct hiddev_devinfo dinfo; | |
393 | struct hid_report *report; | |
394 | struct hid_field *field; | |
4916b3a5 | 395 | struct usbhid_device *usbhid = hid->driver_data; |
1da177e4 LT |
396 | void __user *user_arg = (void __user *)arg; |
397 | int i; | |
398 | ||
399 | if (!hiddev->exist) | |
400 | return -EIO; | |
401 | ||
402 | switch (cmd) { | |
403 | ||
404 | case HIDIOCGVERSION: | |
405 | return put_user(HID_VERSION, (int __user *)arg); | |
406 | ||
407 | case HIDIOCAPPLICATION: | |
408 | if (arg < 0 || arg >= hid->maxapplication) | |
409 | return -EINVAL; | |
410 | ||
411 | for (i = 0; i < hid->maxcollection; i++) | |
05f091ab | 412 | if (hid->collection[i].type == |
1da177e4 LT |
413 | HID_COLLECTION_APPLICATION && arg-- == 0) |
414 | break; | |
05f091ab | 415 | |
1da177e4 LT |
416 | if (i == hid->maxcollection) |
417 | return -EINVAL; | |
418 | ||
419 | return hid->collection[i].usage; | |
420 | ||
421 | case HIDIOCGDEVINFO: | |
422 | dinfo.bustype = BUS_USB; | |
423 | dinfo.busnum = dev->bus->busnum; | |
424 | dinfo.devnum = dev->devnum; | |
4916b3a5 | 425 | dinfo.ifnum = usbhid->ifnum; |
1da177e4 LT |
426 | dinfo.vendor = le16_to_cpu(dev->descriptor.idVendor); |
427 | dinfo.product = le16_to_cpu(dev->descriptor.idProduct); | |
428 | dinfo.version = le16_to_cpu(dev->descriptor.bcdDevice); | |
429 | dinfo.num_applications = hid->maxapplication; | |
430 | if (copy_to_user(user_arg, &dinfo, sizeof(dinfo))) | |
431 | return -EFAULT; | |
432 | ||
433 | return 0; | |
434 | ||
435 | case HIDIOCGFLAG: | |
436 | if (put_user(list->flags, (int __user *)arg)) | |
437 | return -EFAULT; | |
438 | ||
439 | return 0; | |
440 | ||
441 | case HIDIOCSFLAG: | |
442 | { | |
443 | int newflags; | |
444 | if (get_user(newflags, (int __user *)arg)) | |
445 | return -EFAULT; | |
446 | ||
447 | if ((newflags & ~HIDDEV_FLAGS) != 0 || | |
448 | ((newflags & HIDDEV_FLAG_REPORT) != 0 && | |
449 | (newflags & HIDDEV_FLAG_UREF) == 0)) | |
450 | return -EINVAL; | |
451 | ||
452 | list->flags = newflags; | |
453 | ||
454 | return 0; | |
455 | } | |
456 | ||
457 | case HIDIOCGSTRING: | |
458 | { | |
459 | int idx, len; | |
460 | char *buf; | |
461 | ||
462 | if (get_user(idx, (int __user *)arg)) | |
463 | return -EFAULT; | |
464 | ||
465 | if ((buf = kmalloc(HID_STRING_SIZE, GFP_KERNEL)) == NULL) | |
466 | return -ENOMEM; | |
467 | ||
468 | if ((len = usb_string(dev, idx, buf, HID_STRING_SIZE-1)) < 0) { | |
469 | kfree(buf); | |
470 | return -EINVAL; | |
471 | } | |
472 | ||
473 | if (copy_to_user(user_arg+sizeof(int), buf, len+1)) { | |
474 | kfree(buf); | |
475 | return -EFAULT; | |
476 | } | |
477 | ||
478 | kfree(buf); | |
479 | ||
480 | return len; | |
481 | } | |
482 | ||
483 | case HIDIOCINITREPORT: | |
4916b3a5 | 484 | usbhid_init_reports(hid); |
1da177e4 LT |
485 | |
486 | return 0; | |
487 | ||
488 | case HIDIOCGREPORT: | |
489 | if (copy_from_user(&rinfo, user_arg, sizeof(rinfo))) | |
490 | return -EFAULT; | |
491 | ||
492 | if (rinfo.report_type == HID_REPORT_TYPE_OUTPUT) | |
493 | return -EINVAL; | |
494 | ||
495 | if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL) | |
496 | return -EINVAL; | |
497 | ||
4916b3a5 JK |
498 | usbhid_submit_report(hid, report, USB_DIR_IN); |
499 | usbhid_wait_io(hid); | |
1da177e4 LT |
500 | |
501 | return 0; | |
502 | ||
503 | case HIDIOCSREPORT: | |
504 | if (copy_from_user(&rinfo, user_arg, sizeof(rinfo))) | |
505 | return -EFAULT; | |
506 | ||
507 | if (rinfo.report_type == HID_REPORT_TYPE_INPUT) | |
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_OUT); |
514 | usbhid_wait_io(hid); | |
1da177e4 LT |
515 | |
516 | return 0; | |
517 | ||
518 | case HIDIOCGREPORTINFO: | |
519 | if (copy_from_user(&rinfo, user_arg, sizeof(rinfo))) | |
520 | return -EFAULT; | |
521 | ||
522 | if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL) | |
523 | return -EINVAL; | |
524 | ||
525 | rinfo.num_fields = report->maxfield; | |
526 | ||
527 | if (copy_to_user(user_arg, &rinfo, sizeof(rinfo))) | |
528 | return -EFAULT; | |
529 | ||
530 | return 0; | |
531 | ||
532 | case HIDIOCGFIELDINFO: | |
533 | if (copy_from_user(&finfo, user_arg, sizeof(finfo))) | |
534 | return -EFAULT; | |
535 | rinfo.report_type = finfo.report_type; | |
536 | rinfo.report_id = finfo.report_id; | |
537 | if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL) | |
538 | return -EINVAL; | |
539 | ||
540 | if (finfo.field_index >= report->maxfield) | |
541 | return -EINVAL; | |
542 | ||
543 | field = report->field[finfo.field_index]; | |
544 | memset(&finfo, 0, sizeof(finfo)); | |
545 | finfo.report_type = rinfo.report_type; | |
546 | finfo.report_id = rinfo.report_id; | |
547 | finfo.field_index = field->report_count - 1; | |
548 | finfo.maxusage = field->maxusage; | |
549 | finfo.flags = field->flags; | |
550 | finfo.physical = field->physical; | |
551 | finfo.logical = field->logical; | |
552 | finfo.application = field->application; | |
553 | finfo.logical_minimum = field->logical_minimum; | |
554 | finfo.logical_maximum = field->logical_maximum; | |
555 | finfo.physical_minimum = field->physical_minimum; | |
556 | finfo.physical_maximum = field->physical_maximum; | |
557 | finfo.unit_exponent = field->unit_exponent; | |
558 | finfo.unit = field->unit; | |
559 | ||
560 | if (copy_to_user(user_arg, &finfo, sizeof(finfo))) | |
561 | return -EFAULT; | |
562 | ||
563 | return 0; | |
564 | ||
565 | case HIDIOCGUCODE: | |
566 | uref_multi = kmalloc(sizeof(struct hiddev_usage_ref_multi), GFP_KERNEL); | |
567 | if (!uref_multi) | |
568 | return -ENOMEM; | |
569 | uref = &uref_multi->uref; | |
05f091ab | 570 | if (copy_from_user(uref, user_arg, sizeof(*uref))) |
1da177e4 LT |
571 | goto fault; |
572 | ||
573 | rinfo.report_type = uref->report_type; | |
574 | rinfo.report_id = uref->report_id; | |
575 | if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL) | |
576 | goto inval; | |
577 | ||
578 | if (uref->field_index >= report->maxfield) | |
579 | goto inval; | |
580 | ||
581 | field = report->field[uref->field_index]; | |
582 | if (uref->usage_index >= field->maxusage) | |
583 | goto inval; | |
584 | ||
585 | uref->usage_code = field->usage[uref->usage_index].hid; | |
586 | ||
587 | if (copy_to_user(user_arg, uref, sizeof(*uref))) | |
588 | goto fault; | |
589 | ||
590 | kfree(uref_multi); | |
591 | return 0; | |
592 | ||
593 | case HIDIOCGUSAGE: | |
594 | case HIDIOCSUSAGE: | |
595 | case HIDIOCGUSAGES: | |
596 | case HIDIOCSUSAGES: | |
597 | case HIDIOCGCOLLECTIONINDEX: | |
598 | uref_multi = kmalloc(sizeof(struct hiddev_usage_ref_multi), GFP_KERNEL); | |
599 | if (!uref_multi) | |
600 | return -ENOMEM; | |
601 | uref = &uref_multi->uref; | |
602 | if (cmd == HIDIOCGUSAGES || cmd == HIDIOCSUSAGES) { | |
05f091ab | 603 | if (copy_from_user(uref_multi, user_arg, |
1da177e4 LT |
604 | sizeof(*uref_multi))) |
605 | goto fault; | |
606 | } else { | |
607 | if (copy_from_user(uref, user_arg, sizeof(*uref))) | |
608 | goto fault; | |
609 | } | |
610 | ||
05f091ab | 611 | if (cmd != HIDIOCGUSAGE && |
1da177e4 LT |
612 | cmd != HIDIOCGUSAGES && |
613 | uref->report_type == HID_REPORT_TYPE_INPUT) | |
614 | goto inval; | |
615 | ||
616 | if (uref->report_id == HID_REPORT_ID_UNKNOWN) { | |
617 | field = hiddev_lookup_usage(hid, uref); | |
618 | if (field == NULL) | |
619 | goto inval; | |
620 | } else { | |
621 | rinfo.report_type = uref->report_type; | |
622 | rinfo.report_id = uref->report_id; | |
623 | if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL) | |
624 | goto inval; | |
625 | ||
626 | if (uref->field_index >= report->maxfield) | |
627 | goto inval; | |
628 | ||
629 | field = report->field[uref->field_index]; | |
630 | ||
631 | if (cmd == HIDIOCGCOLLECTIONINDEX) { | |
632 | if (uref->usage_index >= field->maxusage) | |
633 | goto inval; | |
634 | } else if (uref->usage_index >= field->report_count) | |
635 | goto inval; | |
636 | ||
637 | else if ((cmd == HIDIOCGUSAGES || cmd == HIDIOCSUSAGES) && | |
638 | (uref_multi->num_values > HID_MAX_MULTI_USAGES || | |
6dea9347 | 639 | uref->usage_index + uref_multi->num_values > field->report_count)) |
1da177e4 LT |
640 | goto inval; |
641 | } | |
642 | ||
643 | switch (cmd) { | |
644 | case HIDIOCGUSAGE: | |
645 | uref->value = field->value[uref->usage_index]; | |
646 | if (copy_to_user(user_arg, uref, sizeof(*uref))) | |
647 | goto fault; | |
648 | goto goodreturn; | |
649 | ||
650 | case HIDIOCSUSAGE: | |
651 | field->value[uref->usage_index] = uref->value; | |
652 | goto goodreturn; | |
653 | ||
654 | case HIDIOCGCOLLECTIONINDEX: | |
655 | kfree(uref_multi); | |
656 | return field->usage[uref->usage_index].collection_index; | |
657 | case HIDIOCGUSAGES: | |
658 | for (i = 0; i < uref_multi->num_values; i++) | |
05f091ab | 659 | uref_multi->values[i] = |
1da177e4 | 660 | field->value[uref->usage_index + i]; |
05f091ab | 661 | if (copy_to_user(user_arg, uref_multi, |
1da177e4 LT |
662 | sizeof(*uref_multi))) |
663 | goto fault; | |
664 | goto goodreturn; | |
665 | case HIDIOCSUSAGES: | |
666 | for (i = 0; i < uref_multi->num_values; i++) | |
05f091ab DT |
667 | field->value[uref->usage_index + i] = |
668 | uref_multi->values[i]; | |
1da177e4 LT |
669 | goto goodreturn; |
670 | } | |
671 | ||
672 | goodreturn: | |
673 | kfree(uref_multi); | |
674 | return 0; | |
675 | fault: | |
676 | kfree(uref_multi); | |
677 | return -EFAULT; | |
05f091ab | 678 | inval: |
1da177e4 LT |
679 | kfree(uref_multi); |
680 | return -EINVAL; | |
681 | ||
682 | case HIDIOCGCOLLECTIONINFO: | |
683 | if (copy_from_user(&cinfo, user_arg, sizeof(cinfo))) | |
684 | return -EFAULT; | |
685 | ||
686 | if (cinfo.index >= hid->maxcollection) | |
687 | return -EINVAL; | |
688 | ||
689 | cinfo.type = hid->collection[cinfo.index].type; | |
690 | cinfo.usage = hid->collection[cinfo.index].usage; | |
691 | cinfo.level = hid->collection[cinfo.index].level; | |
692 | ||
693 | if (copy_to_user(user_arg, &cinfo, sizeof(cinfo))) | |
694 | return -EFAULT; | |
695 | return 0; | |
696 | ||
697 | default: | |
698 | ||
699 | if (_IOC_TYPE(cmd) != 'H' || _IOC_DIR(cmd) != _IOC_READ) | |
700 | return -EINVAL; | |
701 | ||
702 | if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGNAME(0))) { | |
703 | int len; | |
704 | if (!hid->name) | |
705 | return 0; | |
706 | len = strlen(hid->name) + 1; | |
707 | if (len > _IOC_SIZE(cmd)) | |
708 | len = _IOC_SIZE(cmd); | |
709 | return copy_to_user(user_arg, hid->name, len) ? | |
710 | -EFAULT : len; | |
711 | } | |
712 | ||
713 | if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGPHYS(0))) { | |
714 | int len; | |
715 | if (!hid->phys) | |
716 | return 0; | |
717 | len = strlen(hid->phys) + 1; | |
718 | if (len > _IOC_SIZE(cmd)) | |
719 | len = _IOC_SIZE(cmd); | |
720 | return copy_to_user(user_arg, hid->phys, len) ? | |
721 | -EFAULT : len; | |
722 | } | |
723 | } | |
724 | return -EINVAL; | |
725 | } | |
726 | ||
066202dd | 727 | static const struct file_operations hiddev_fops = { |
1da177e4 LT |
728 | .owner = THIS_MODULE, |
729 | .read = hiddev_read, | |
730 | .write = hiddev_write, | |
731 | .poll = hiddev_poll, | |
732 | .open = hiddev_open, | |
733 | .release = hiddev_release, | |
734 | .ioctl = hiddev_ioctl, | |
735 | .fasync = hiddev_fasync, | |
736 | }; | |
737 | ||
738 | static struct usb_class_driver hiddev_class = { | |
d6e5bcf4 | 739 | .name = "hiddev%d", |
1da177e4 | 740 | .fops = &hiddev_fops, |
05f091ab | 741 | .minor_base = HIDDEV_MINOR_BASE, |
1da177e4 LT |
742 | }; |
743 | ||
744 | /* | |
745 | * This is where hid.c calls us to connect a hid device to the hiddev driver | |
746 | */ | |
747 | int hiddev_connect(struct hid_device *hid) | |
748 | { | |
749 | struct hiddev *hiddev; | |
4916b3a5 | 750 | struct usbhid_device *usbhid = hid->driver_data; |
1da177e4 LT |
751 | int i; |
752 | int retval; | |
753 | ||
754 | for (i = 0; i < hid->maxcollection; i++) | |
05f091ab | 755 | if (hid->collection[i].type == |
1da177e4 LT |
756 | HID_COLLECTION_APPLICATION && |
757 | !IS_INPUT_APPLICATION(hid->collection[i].usage)) | |
758 | break; | |
759 | ||
760 | if (i == hid->maxcollection && (hid->quirks & HID_QUIRK_HIDDEV) == 0) | |
761 | return -1; | |
762 | ||
bbdb7daf | 763 | if (!(hiddev = kzalloc(sizeof(struct hiddev), GFP_KERNEL))) |
1da177e4 | 764 | return -1; |
1da177e4 | 765 | |
4916b3a5 | 766 | retval = usb_register_dev(usbhid->intf, &hiddev_class); |
1da177e4 LT |
767 | if (retval) { |
768 | err("Not able to get a minor for this device."); | |
769 | kfree(hiddev); | |
770 | return -1; | |
771 | } | |
772 | ||
773 | init_waitqueue_head(&hiddev->wait); | |
826d5982 | 774 | INIT_LIST_HEAD(&hiddev->list); |
1da177e4 LT |
775 | hiddev->hid = hid; |
776 | hiddev->exist = 1; | |
777 | ||
4916b3a5 | 778 | hid->minor = usbhid->intf->minor; |
1da177e4 LT |
779 | hid->hiddev = hiddev; |
780 | ||
4916b3a5 | 781 | hiddev_table[usbhid->intf->minor - HIDDEV_MINOR_BASE] = hiddev; |
826d5982 | 782 | |
1da177e4 LT |
783 | return 0; |
784 | } | |
785 | ||
786 | /* | |
787 | * This is where hid.c calls us to disconnect a hiddev device from the | |
788 | * corresponding hid device (usually because the usb device has disconnected) | |
789 | */ | |
790 | static struct usb_class_driver hiddev_class; | |
791 | void hiddev_disconnect(struct hid_device *hid) | |
792 | { | |
793 | struct hiddev *hiddev = hid->hiddev; | |
4916b3a5 | 794 | struct usbhid_device *usbhid = hid->driver_data; |
1da177e4 LT |
795 | |
796 | hiddev->exist = 0; | |
797 | ||
798 | hiddev_table[hiddev->hid->minor - HIDDEV_MINOR_BASE] = NULL; | |
4916b3a5 | 799 | usb_deregister_dev(usbhid->intf, &hiddev_class); |
1da177e4 LT |
800 | |
801 | if (hiddev->open) { | |
4916b3a5 | 802 | usbhid_close(hiddev->hid); |
1da177e4 LT |
803 | wake_up_interruptible(&hiddev->wait); |
804 | } else { | |
805 | kfree(hiddev); | |
806 | } | |
807 | } | |
808 | ||
809 | /* Currently this driver is a USB driver. It's not a conventional one in | |
810 | * the sense that it doesn't probe at the USB level. Instead it waits to | |
811 | * be connected by HID through the hiddev_connect / hiddev_disconnect | |
812 | * routines. The reason to register as a USB device is to gain part of the | |
813 | * minor number space from the USB major. | |
814 | * | |
815 | * In theory, should the HID code be generalized to more than one physical | |
816 | * medium (say, IEEE 1384), this driver will probably need to register its | |
817 | * own major number, and in doing so, no longer need to register with USB. | |
818 | * At that point the probe routine and hiddev_driver struct below will no | |
819 | * longer be useful. | |
820 | */ | |
821 | ||
822 | ||
823 | /* We never attach in this manner, and rely on HID to connect us. This | |
824 | * is why there is no disconnect routine defined in the usb_driver either. | |
825 | */ | |
05f091ab | 826 | static int hiddev_usbd_probe(struct usb_interface *intf, |
1da177e4 LT |
827 | const struct usb_device_id *hiddev_info) |
828 | { | |
829 | return -ENODEV; | |
830 | } | |
831 | ||
832 | ||
833 | static /* const */ struct usb_driver hiddev_driver = { | |
1da177e4 LT |
834 | .name = "hiddev", |
835 | .probe = hiddev_usbd_probe, | |
836 | }; | |
837 | ||
838 | int __init hiddev_init(void) | |
839 | { | |
1da177e4 LT |
840 | return usb_register(&hiddev_driver); |
841 | } | |
842 | ||
843 | void hiddev_exit(void) | |
844 | { | |
845 | usb_deregister(&hiddev_driver); | |
1da177e4 | 846 | } |