1 /*
2 * Copyright (C) 2011 Instituto Nokia de Tecnologia
3 *
4 * Authors:
5 * Lauro Ramos Venancio <lauro.venancio@openbossa.org>
6 * Aloisio Almeida Jr <aloisio.almeida@openbossa.org>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the
20 * Free Software Foundation, Inc.,
21 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
22 */
23
24 #define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__
25
26 #include <net/genetlink.h>
27 #include <linux/nfc.h>
28 #include <linux/slab.h>
29
30 #include "nfc.h"
31
32 static struct genl_multicast_group nfc_genl_event_mcgrp = {
33 .name = NFC_GENL_MCAST_EVENT_NAME,
34 };
35
36 struct genl_family nfc_genl_family = {
37 .id = GENL_ID_GENERATE,
38 .hdrsize = 0,
39 .name = NFC_GENL_NAME,
40 .version = NFC_GENL_VERSION,
41 .maxattr = NFC_ATTR_MAX,
42 };
43
44 static const struct nla_policy nfc_genl_policy[NFC_ATTR_MAX + 1] = {
45 [NFC_ATTR_DEVICE_INDEX] = { .type = NLA_U32 },
46 [NFC_ATTR_DEVICE_NAME] = { .type = NLA_STRING,
47 .len = NFC_DEVICE_NAME_MAXSIZE },
48 [NFC_ATTR_PROTOCOLS] = { .type = NLA_U32 },
49 [NFC_ATTR_COMM_MODE] = { .type = NLA_U8 },
50 [NFC_ATTR_RF_MODE] = { .type = NLA_U8 },
51 };
52
nfc_genl_send_target(struct sk_buff * msg,struct nfc_target * target,struct netlink_callback * cb,int flags)53 static int nfc_genl_send_target(struct sk_buff *msg, struct nfc_target *target,
54 struct netlink_callback *cb, int flags)
55 {
56 void *hdr;
57
58 hdr = genlmsg_put(msg, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq,
59 &nfc_genl_family, flags, NFC_CMD_GET_TARGET);
60 if (!hdr)
61 return -EMSGSIZE;
62
63 genl_dump_check_consistent(cb, hdr, &nfc_genl_family);
64
65 NLA_PUT_U32(msg, NFC_ATTR_TARGET_INDEX, target->idx);
66 NLA_PUT_U32(msg, NFC_ATTR_PROTOCOLS,
67 target->supported_protocols);
68 NLA_PUT_U16(msg, NFC_ATTR_TARGET_SENS_RES, target->sens_res);
69 NLA_PUT_U8(msg, NFC_ATTR_TARGET_SEL_RES, target->sel_res);
70 if (target->nfcid1_len > 0)
71 NLA_PUT(msg, NFC_ATTR_TARGET_NFCID1, target->nfcid1_len,
72 target->nfcid1);
73
74 return genlmsg_end(msg, hdr);
75
76 nla_put_failure:
77 genlmsg_cancel(msg, hdr);
78 return -EMSGSIZE;
79 }
80
__get_device_from_cb(struct netlink_callback * cb)81 static struct nfc_dev *__get_device_from_cb(struct netlink_callback *cb)
82 {
83 struct nfc_dev *dev;
84 int rc;
85 u32 idx;
86
87 rc = nlmsg_parse(cb->nlh, GENL_HDRLEN + nfc_genl_family.hdrsize,
88 nfc_genl_family.attrbuf,
89 nfc_genl_family.maxattr,
90 nfc_genl_policy);
91 if (rc < 0)
92 return ERR_PTR(rc);
93
94 if (!nfc_genl_family.attrbuf[NFC_ATTR_DEVICE_INDEX])
95 return ERR_PTR(-EINVAL);
96
97 idx = nla_get_u32(nfc_genl_family.attrbuf[NFC_ATTR_DEVICE_INDEX]);
98
99 dev = nfc_get_device(idx);
100 if (!dev)
101 return ERR_PTR(-ENODEV);
102
103 return dev;
104 }
105
nfc_genl_dump_targets(struct sk_buff * skb,struct netlink_callback * cb)106 static int nfc_genl_dump_targets(struct sk_buff *skb,
107 struct netlink_callback *cb)
108 {
109 int i = cb->args[0];
110 struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
111 int rc;
112
113 if (!dev) {
114 dev = __get_device_from_cb(cb);
115 if (IS_ERR(dev))
116 return PTR_ERR(dev);
117
118 cb->args[1] = (long) dev;
119 }
120
121 spin_lock_bh(&dev->targets_lock);
122
123 cb->seq = dev->targets_generation;
124
125 while (i < dev->n_targets) {
126 rc = nfc_genl_send_target(skb, &dev->targets[i], cb,
127 NLM_F_MULTI);
128 if (rc < 0)
129 break;
130
131 i++;
132 }
133
134 spin_unlock_bh(&dev->targets_lock);
135
136 cb->args[0] = i;
137
138 return skb->len;
139 }
140
nfc_genl_dump_targets_done(struct netlink_callback * cb)141 static int nfc_genl_dump_targets_done(struct netlink_callback *cb)
142 {
143 struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
144
145 if (dev)
146 nfc_put_device(dev);
147
148 return 0;
149 }
150
nfc_genl_targets_found(struct nfc_dev * dev)151 int nfc_genl_targets_found(struct nfc_dev *dev)
152 {
153 struct sk_buff *msg;
154 void *hdr;
155
156 dev->genl_data.poll_req_pid = 0;
157
158 msg = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
159 if (!msg)
160 return -ENOMEM;
161
162 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
163 NFC_EVENT_TARGETS_FOUND);
164 if (!hdr)
165 goto free_msg;
166
167 NLA_PUT_U32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx);
168
169 genlmsg_end(msg, hdr);
170
171 return genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_ATOMIC);
172
173 nla_put_failure:
174 genlmsg_cancel(msg, hdr);
175 free_msg:
176 nlmsg_free(msg);
177 return -EMSGSIZE;
178 }
179
nfc_genl_device_added(struct nfc_dev * dev)180 int nfc_genl_device_added(struct nfc_dev *dev)
181 {
182 struct sk_buff *msg;
183 void *hdr;
184
185 msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
186 if (!msg)
187 return -ENOMEM;
188
189 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
190 NFC_EVENT_DEVICE_ADDED);
191 if (!hdr)
192 goto free_msg;
193
194 NLA_PUT_STRING(msg, NFC_ATTR_DEVICE_NAME, nfc_device_name(dev));
195 NLA_PUT_U32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx);
196 NLA_PUT_U32(msg, NFC_ATTR_PROTOCOLS, dev->supported_protocols);
197
198 genlmsg_end(msg, hdr);
199
200 genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL);
201
202 return 0;
203
204 nla_put_failure:
205 genlmsg_cancel(msg, hdr);
206 free_msg:
207 nlmsg_free(msg);
208 return -EMSGSIZE;
209 }
210
nfc_genl_device_removed(struct nfc_dev * dev)211 int nfc_genl_device_removed(struct nfc_dev *dev)
212 {
213 struct sk_buff *msg;
214 void *hdr;
215
216 msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
217 if (!msg)
218 return -ENOMEM;
219
220 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
221 NFC_EVENT_DEVICE_REMOVED);
222 if (!hdr)
223 goto free_msg;
224
225 NLA_PUT_U32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx);
226
227 genlmsg_end(msg, hdr);
228
229 genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL);
230
231 return 0;
232
233 nla_put_failure:
234 genlmsg_cancel(msg, hdr);
235 free_msg:
236 nlmsg_free(msg);
237 return -EMSGSIZE;
238 }
239
nfc_genl_send_device(struct sk_buff * msg,struct nfc_dev * dev,u32 pid,u32 seq,struct netlink_callback * cb,int flags)240 static int nfc_genl_send_device(struct sk_buff *msg, struct nfc_dev *dev,
241 u32 pid, u32 seq,
242 struct netlink_callback *cb,
243 int flags)
244 {
245 void *hdr;
246
247 hdr = genlmsg_put(msg, pid, seq, &nfc_genl_family, flags,
248 NFC_CMD_GET_DEVICE);
249 if (!hdr)
250 return -EMSGSIZE;
251
252 if (cb)
253 genl_dump_check_consistent(cb, hdr, &nfc_genl_family);
254
255 NLA_PUT_STRING(msg, NFC_ATTR_DEVICE_NAME, nfc_device_name(dev));
256 NLA_PUT_U32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx);
257 NLA_PUT_U32(msg, NFC_ATTR_PROTOCOLS, dev->supported_protocols);
258
259 return genlmsg_end(msg, hdr);
260
261 nla_put_failure:
262 genlmsg_cancel(msg, hdr);
263 return -EMSGSIZE;
264 }
265
nfc_genl_dump_devices(struct sk_buff * skb,struct netlink_callback * cb)266 static int nfc_genl_dump_devices(struct sk_buff *skb,
267 struct netlink_callback *cb)
268 {
269 struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
270 struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
271 bool first_call = false;
272
273 if (!iter) {
274 first_call = true;
275 iter = kmalloc(sizeof(struct class_dev_iter), GFP_KERNEL);
276 if (!iter)
277 return -ENOMEM;
278 cb->args[0] = (long) iter;
279 }
280
281 mutex_lock(&nfc_devlist_mutex);
282
283 cb->seq = nfc_devlist_generation;
284
285 if (first_call) {
286 nfc_device_iter_init(iter);
287 dev = nfc_device_iter_next(iter);
288 }
289
290 while (dev) {
291 int rc;
292
293 rc = nfc_genl_send_device(skb, dev, NETLINK_CB(cb->skb).pid,
294 cb->nlh->nlmsg_seq,
295 cb, NLM_F_MULTI);
296 if (rc < 0)
297 break;
298
299 dev = nfc_device_iter_next(iter);
300 }
301
302 mutex_unlock(&nfc_devlist_mutex);
303
304 cb->args[1] = (long) dev;
305
306 return skb->len;
307 }
308
nfc_genl_dump_devices_done(struct netlink_callback * cb)309 static int nfc_genl_dump_devices_done(struct netlink_callback *cb)
310 {
311 struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
312
313 nfc_device_iter_exit(iter);
314 kfree(iter);
315
316 return 0;
317 }
318
nfc_genl_dep_link_up_event(struct nfc_dev * dev,u32 target_idx,u8 comm_mode,u8 rf_mode)319 int nfc_genl_dep_link_up_event(struct nfc_dev *dev, u32 target_idx,
320 u8 comm_mode, u8 rf_mode)
321 {
322 struct sk_buff *msg;
323 void *hdr;
324
325 pr_debug("DEP link is up\n");
326
327 msg = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
328 if (!msg)
329 return -ENOMEM;
330
331 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
332 NFC_CMD_DEP_LINK_UP);
333 if (!hdr)
334 goto free_msg;
335
336 NLA_PUT_U32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx);
337 if (rf_mode == NFC_RF_INITIATOR)
338 NLA_PUT_U32(msg, NFC_ATTR_TARGET_INDEX, target_idx);
339 NLA_PUT_U8(msg, NFC_ATTR_COMM_MODE, comm_mode);
340 NLA_PUT_U8(msg, NFC_ATTR_RF_MODE, rf_mode);
341
342 genlmsg_end(msg, hdr);
343
344 dev->dep_link_up = true;
345
346 genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_ATOMIC);
347
348 return 0;
349
350 nla_put_failure:
351 genlmsg_cancel(msg, hdr);
352 free_msg:
353 nlmsg_free(msg);
354 return -EMSGSIZE;
355 }
356
nfc_genl_dep_link_down_event(struct nfc_dev * dev)357 int nfc_genl_dep_link_down_event(struct nfc_dev *dev)
358 {
359 struct sk_buff *msg;
360 void *hdr;
361
362 pr_debug("DEP link is down\n");
363
364 msg = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
365 if (!msg)
366 return -ENOMEM;
367
368 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
369 NFC_CMD_DEP_LINK_DOWN);
370 if (!hdr)
371 goto free_msg;
372
373 NLA_PUT_U32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx);
374
375 genlmsg_end(msg, hdr);
376
377 genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_ATOMIC);
378
379 return 0;
380
381 nla_put_failure:
382 genlmsg_cancel(msg, hdr);
383 free_msg:
384 nlmsg_free(msg);
385 return -EMSGSIZE;
386 }
387
nfc_genl_get_device(struct sk_buff * skb,struct genl_info * info)388 static int nfc_genl_get_device(struct sk_buff *skb, struct genl_info *info)
389 {
390 struct sk_buff *msg;
391 struct nfc_dev *dev;
392 u32 idx;
393 int rc = -ENOBUFS;
394
395 if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
396 return -EINVAL;
397
398 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
399
400 dev = nfc_get_device(idx);
401 if (!dev)
402 return -ENODEV;
403
404 msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
405 if (!msg) {
406 rc = -ENOMEM;
407 goto out_putdev;
408 }
409
410 rc = nfc_genl_send_device(msg, dev, info->snd_pid, info->snd_seq,
411 NULL, 0);
412 if (rc < 0)
413 goto out_free;
414
415 nfc_put_device(dev);
416
417 return genlmsg_reply(msg, info);
418
419 out_free:
420 nlmsg_free(msg);
421 out_putdev:
422 nfc_put_device(dev);
423 return rc;
424 }
425
nfc_genl_dev_up(struct sk_buff * skb,struct genl_info * info)426 static int nfc_genl_dev_up(struct sk_buff *skb, struct genl_info *info)
427 {
428 struct nfc_dev *dev;
429 int rc;
430 u32 idx;
431
432 if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
433 return -EINVAL;
434
435 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
436
437 dev = nfc_get_device(idx);
438 if (!dev)
439 return -ENODEV;
440
441 rc = nfc_dev_up(dev);
442
443 nfc_put_device(dev);
444 return rc;
445 }
446
nfc_genl_dev_down(struct sk_buff * skb,struct genl_info * info)447 static int nfc_genl_dev_down(struct sk_buff *skb, struct genl_info *info)
448 {
449 struct nfc_dev *dev;
450 int rc;
451 u32 idx;
452
453 if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
454 return -EINVAL;
455
456 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
457
458 dev = nfc_get_device(idx);
459 if (!dev)
460 return -ENODEV;
461
462 rc = nfc_dev_down(dev);
463
464 nfc_put_device(dev);
465 return rc;
466 }
467
nfc_genl_start_poll(struct sk_buff * skb,struct genl_info * info)468 static int nfc_genl_start_poll(struct sk_buff *skb, struct genl_info *info)
469 {
470 struct nfc_dev *dev;
471 int rc;
472 u32 idx;
473 u32 protocols;
474
475 pr_debug("Poll start\n");
476
477 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
478 !info->attrs[NFC_ATTR_PROTOCOLS])
479 return -EINVAL;
480
481 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
482 protocols = nla_get_u32(info->attrs[NFC_ATTR_PROTOCOLS]);
483
484 dev = nfc_get_device(idx);
485 if (!dev)
486 return -ENODEV;
487
488 mutex_lock(&dev->genl_data.genl_data_mutex);
489
490 rc = nfc_start_poll(dev, protocols);
491 if (!rc)
492 dev->genl_data.poll_req_pid = info->snd_pid;
493
494 mutex_unlock(&dev->genl_data.genl_data_mutex);
495
496 nfc_put_device(dev);
497 return rc;
498 }
499
nfc_genl_stop_poll(struct sk_buff * skb,struct genl_info * info)500 static int nfc_genl_stop_poll(struct sk_buff *skb, struct genl_info *info)
501 {
502 struct nfc_dev *dev;
503 int rc;
504 u32 idx;
505
506 if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
507 return -EINVAL;
508
509 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
510
511 dev = nfc_get_device(idx);
512 if (!dev)
513 return -ENODEV;
514
515 mutex_lock(&dev->genl_data.genl_data_mutex);
516
517 if (dev->genl_data.poll_req_pid != info->snd_pid) {
518 rc = -EBUSY;
519 goto out;
520 }
521
522 rc = nfc_stop_poll(dev);
523 dev->genl_data.poll_req_pid = 0;
524
525 out:
526 mutex_unlock(&dev->genl_data.genl_data_mutex);
527 nfc_put_device(dev);
528 return rc;
529 }
530
nfc_genl_dep_link_up(struct sk_buff * skb,struct genl_info * info)531 static int nfc_genl_dep_link_up(struct sk_buff *skb, struct genl_info *info)
532 {
533 struct nfc_dev *dev;
534 int rc, tgt_idx;
535 u32 idx;
536 u8 comm, rf;
537
538 pr_debug("DEP link up\n");
539
540 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
541 !info->attrs[NFC_ATTR_COMM_MODE] ||
542 !info->attrs[NFC_ATTR_RF_MODE])
543 return -EINVAL;
544
545 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
546 if (!info->attrs[NFC_ATTR_TARGET_INDEX])
547 tgt_idx = NFC_TARGET_IDX_ANY;
548 else
549 tgt_idx = nla_get_u32(info->attrs[NFC_ATTR_TARGET_INDEX]);
550
551 comm = nla_get_u8(info->attrs[NFC_ATTR_COMM_MODE]);
552 rf = nla_get_u8(info->attrs[NFC_ATTR_RF_MODE]);
553
554 if (comm != NFC_COMM_ACTIVE && comm != NFC_COMM_PASSIVE)
555 return -EINVAL;
556
557 if (rf != NFC_RF_INITIATOR && comm != NFC_RF_TARGET)
558 return -EINVAL;
559
560 dev = nfc_get_device(idx);
561 if (!dev)
562 return -ENODEV;
563
564 rc = nfc_dep_link_up(dev, tgt_idx, comm, rf);
565
566 nfc_put_device(dev);
567
568 return rc;
569 }
570
nfc_genl_dep_link_down(struct sk_buff * skb,struct genl_info * info)571 static int nfc_genl_dep_link_down(struct sk_buff *skb, struct genl_info *info)
572 {
573 struct nfc_dev *dev;
574 int rc;
575 u32 idx;
576
577 if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
578 return -EINVAL;
579
580 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
581
582 dev = nfc_get_device(idx);
583 if (!dev)
584 return -ENODEV;
585
586 rc = nfc_dep_link_down(dev);
587
588 nfc_put_device(dev);
589 return rc;
590 }
591
592 static struct genl_ops nfc_genl_ops[] = {
593 {
594 .cmd = NFC_CMD_GET_DEVICE,
595 .doit = nfc_genl_get_device,
596 .dumpit = nfc_genl_dump_devices,
597 .done = nfc_genl_dump_devices_done,
598 .policy = nfc_genl_policy,
599 },
600 {
601 .cmd = NFC_CMD_DEV_UP,
602 .doit = nfc_genl_dev_up,
603 .policy = nfc_genl_policy,
604 },
605 {
606 .cmd = NFC_CMD_DEV_DOWN,
607 .doit = nfc_genl_dev_down,
608 .policy = nfc_genl_policy,
609 },
610 {
611 .cmd = NFC_CMD_START_POLL,
612 .doit = nfc_genl_start_poll,
613 .policy = nfc_genl_policy,
614 },
615 {
616 .cmd = NFC_CMD_STOP_POLL,
617 .doit = nfc_genl_stop_poll,
618 .policy = nfc_genl_policy,
619 },
620 {
621 .cmd = NFC_CMD_DEP_LINK_UP,
622 .doit = nfc_genl_dep_link_up,
623 .policy = nfc_genl_policy,
624 },
625 {
626 .cmd = NFC_CMD_DEP_LINK_DOWN,
627 .doit = nfc_genl_dep_link_down,
628 .policy = nfc_genl_policy,
629 },
630 {
631 .cmd = NFC_CMD_GET_TARGET,
632 .dumpit = nfc_genl_dump_targets,
633 .done = nfc_genl_dump_targets_done,
634 .policy = nfc_genl_policy,
635 },
636 };
637
nfc_genl_rcv_nl_event(struct notifier_block * this,unsigned long event,void * ptr)638 static int nfc_genl_rcv_nl_event(struct notifier_block *this,
639 unsigned long event, void *ptr)
640 {
641 struct netlink_notify *n = ptr;
642 struct class_dev_iter iter;
643 struct nfc_dev *dev;
644
645 if (event != NETLINK_URELEASE || n->protocol != NETLINK_GENERIC)
646 goto out;
647
648 pr_debug("NETLINK_URELEASE event from id %d\n", n->pid);
649
650 nfc_device_iter_init(&iter);
651 dev = nfc_device_iter_next(&iter);
652
653 while (dev) {
654 if (dev->genl_data.poll_req_pid == n->pid) {
655 nfc_stop_poll(dev);
656 dev->genl_data.poll_req_pid = 0;
657 }
658 dev = nfc_device_iter_next(&iter);
659 }
660
661 nfc_device_iter_exit(&iter);
662
663 out:
664 return NOTIFY_DONE;
665 }
666
nfc_genl_data_init(struct nfc_genl_data * genl_data)667 void nfc_genl_data_init(struct nfc_genl_data *genl_data)
668 {
669 genl_data->poll_req_pid = 0;
670 mutex_init(&genl_data->genl_data_mutex);
671 }
672
nfc_genl_data_exit(struct nfc_genl_data * genl_data)673 void nfc_genl_data_exit(struct nfc_genl_data *genl_data)
674 {
675 mutex_destroy(&genl_data->genl_data_mutex);
676 }
677
678 static struct notifier_block nl_notifier = {
679 .notifier_call = nfc_genl_rcv_nl_event,
680 };
681
682 /**
683 * nfc_genl_init() - Initialize netlink interface
684 *
685 * This initialization function registers the nfc netlink family.
686 */
nfc_genl_init(void)687 int __init nfc_genl_init(void)
688 {
689 int rc;
690
691 rc = genl_register_family_with_ops(&nfc_genl_family, nfc_genl_ops,
692 ARRAY_SIZE(nfc_genl_ops));
693 if (rc)
694 return rc;
695
696 rc = genl_register_mc_group(&nfc_genl_family, &nfc_genl_event_mcgrp);
697
698 netlink_register_notifier(&nl_notifier);
699
700 return rc;
701 }
702
703 /**
704 * nfc_genl_exit() - Deinitialize netlink interface
705 *
706 * This exit function unregisters the nfc netlink family.
707 */
nfc_genl_exit(void)708 void nfc_genl_exit(void)
709 {
710 netlink_unregister_notifier(&nl_notifier);
711 genl_unregister_family(&nfc_genl_family);
712 }
713