2 * Copyright (C) 2011 Intel Corporation. All rights reserved.
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the
16 * Free Software Foundation, Inc.,
17 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
20 #define pr_fmt(fmt) "llcp: %s: " fmt, __func__
22 #include <linux/init.h>
23 #include <linux/kernel.h>
24 #include <linux/list.h>
25 #include <linux/nfc.h>
30 static u8 llcp_magic[3] = {0x46, 0x66, 0x6d};
32 static struct list_head llcp_devices;
34 static void nfc_llcp_socket_release(struct nfc_llcp_local *local)
36 struct nfc_llcp_sock *parent, *s, *n;
37 struct sock *sk, *parent_sk;
41 mutex_lock(&local->socket_lock);
43 for (i = 0; i < LLCP_MAX_SAP; i++) {
44 parent = local->sockets[i];
48 /* Release all child sockets */
49 list_for_each_entry_safe(s, n, &parent->list, list) {
55 if (sk->sk_state == LLCP_CONNECTED)
56 nfc_put_device(s->dev);
58 sk->sk_state = LLCP_CLOSED;
59 sock_set_flag(sk, SOCK_DEAD);
64 parent_sk = &parent->sk;
68 if (parent_sk->sk_state == LLCP_LISTEN) {
69 struct nfc_llcp_sock *lsk, *n;
70 struct sock *accept_sk;
72 list_for_each_entry_safe(lsk, n, &parent->accept_queue,
77 nfc_llcp_accept_unlink(accept_sk);
79 accept_sk->sk_state = LLCP_CLOSED;
80 sock_set_flag(accept_sk, SOCK_DEAD);
82 release_sock(accept_sk);
84 sock_orphan(accept_sk);
88 if (parent_sk->sk_state == LLCP_CONNECTED)
89 nfc_put_device(parent->dev);
91 parent_sk->sk_state = LLCP_CLOSED;
92 sock_set_flag(parent_sk, SOCK_DEAD);
94 release_sock(parent_sk);
97 mutex_unlock(&local->socket_lock);
100 static void nfc_llcp_timeout_work(struct work_struct *work)
102 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
105 nfc_dep_link_down(local->dev);
108 static void nfc_llcp_symm_timer(unsigned long data)
110 struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
112 pr_err("SYMM timeout\n");
114 queue_work(local->timeout_wq, &local->timeout_work);
117 struct nfc_llcp_local *nfc_llcp_find_local(struct nfc_dev *dev)
119 struct nfc_llcp_local *local, *n;
121 list_for_each_entry_safe(local, n, &llcp_devices, list)
122 if (local->dev == dev)
125 pr_debug("No device found\n");
130 static char *wks[] = {
138 static int nfc_llcp_wks_sap(char *service_name, size_t service_name_len)
142 pr_debug("%s\n", service_name);
144 if (service_name == NULL)
147 num_wks = ARRAY_SIZE(wks);
149 for (sap = 0 ; sap < num_wks; sap++) {
150 if (wks[sap] == NULL)
153 if (strncmp(wks[sap], service_name, service_name_len) == 0)
160 u8 nfc_llcp_get_sdp_ssap(struct nfc_llcp_local *local,
161 struct nfc_llcp_sock *sock)
163 mutex_lock(&local->sdp_lock);
165 if (sock->service_name != NULL && sock->service_name_len > 0) {
166 int ssap = nfc_llcp_wks_sap(sock->service_name,
167 sock->service_name_len);
170 pr_debug("WKS %d\n", ssap);
172 /* This is a WKS, let's check if it's free */
173 if (local->local_wks & BIT(ssap)) {
174 mutex_unlock(&local->sdp_lock);
179 set_bit(BIT(ssap), &local->local_wks);
180 mutex_unlock(&local->sdp_lock);
186 * This is not a well known service,
187 * we should try to find a local SDP free spot
189 ssap = find_first_zero_bit(&local->local_sdp, LLCP_SDP_NUM_SAP);
190 if (ssap == LLCP_SDP_NUM_SAP) {
191 mutex_unlock(&local->sdp_lock);
196 pr_debug("SDP ssap %d\n", LLCP_WKS_NUM_SAP + ssap);
198 set_bit(BIT(ssap), &local->local_sdp);
199 mutex_unlock(&local->sdp_lock);
201 return LLCP_WKS_NUM_SAP + ssap;
203 } else if (sock->ssap != 0) {
204 if (sock->ssap < LLCP_WKS_NUM_SAP) {
205 if (!(local->local_wks & BIT(sock->ssap))) {
206 set_bit(BIT(sock->ssap), &local->local_wks);
207 mutex_unlock(&local->sdp_lock);
212 } else if (sock->ssap < LLCP_SDP_NUM_SAP) {
213 if (!(local->local_sdp &
214 BIT(sock->ssap - LLCP_WKS_NUM_SAP))) {
215 set_bit(BIT(sock->ssap - LLCP_WKS_NUM_SAP),
217 mutex_unlock(&local->sdp_lock);
224 mutex_unlock(&local->sdp_lock);
229 u8 nfc_llcp_get_local_ssap(struct nfc_llcp_local *local)
233 mutex_lock(&local->sdp_lock);
235 local_ssap = find_first_zero_bit(&local->local_sap, LLCP_LOCAL_NUM_SAP);
236 if (local_ssap == LLCP_LOCAL_NUM_SAP) {
237 mutex_unlock(&local->sdp_lock);
241 set_bit(BIT(local_ssap), &local->local_sap);
243 mutex_unlock(&local->sdp_lock);
245 return local_ssap + LLCP_LOCAL_SAP_OFFSET;
248 void nfc_llcp_put_ssap(struct nfc_llcp_local *local, u8 ssap)
253 if (ssap < LLCP_WKS_NUM_SAP) {
255 sdp = &local->local_wks;
256 } else if (ssap < LLCP_LOCAL_NUM_SAP) {
257 local_ssap = ssap - LLCP_WKS_NUM_SAP;
258 sdp = &local->local_sdp;
259 } else if (ssap < LLCP_MAX_SAP) {
260 local_ssap = ssap - LLCP_LOCAL_NUM_SAP;
261 sdp = &local->local_sap;
266 mutex_lock(&local->sdp_lock);
268 clear_bit(1 << local_ssap, sdp);
270 mutex_unlock(&local->sdp_lock);
273 u8 *nfc_llcp_general_bytes(struct nfc_dev *dev, u8 *general_bytes_len)
275 struct nfc_llcp_local *local;
277 local = nfc_llcp_find_local(dev);
279 *general_bytes_len = 0;
283 *general_bytes_len = local->gb_len;
288 static int nfc_llcp_build_gb(struct nfc_llcp_local *local)
290 u8 *gb_cur, *version_tlv, version, version_length;
291 u8 *lto_tlv, lto, lto_length;
292 u8 *wks_tlv, wks_length;
295 version = LLCP_VERSION_11;
296 version_tlv = nfc_llcp_build_tlv(LLCP_TLV_VERSION, &version,
298 gb_len += version_length;
302 lto_tlv = nfc_llcp_build_tlv(LLCP_TLV_VERSION, <o, 1, <o_length);
303 gb_len += lto_length;
305 pr_debug("Local wks 0x%lx\n", local->local_wks);
306 wks_tlv = nfc_llcp_build_tlv(LLCP_TLV_WKS, (u8 *)&local->local_wks, 2,
308 gb_len += wks_length;
310 gb_len += ARRAY_SIZE(llcp_magic);
312 if (gb_len > NFC_MAX_GT_LEN) {
319 memcpy(gb_cur, llcp_magic, ARRAY_SIZE(llcp_magic));
320 gb_cur += ARRAY_SIZE(llcp_magic);
322 memcpy(gb_cur, version_tlv, version_length);
323 gb_cur += version_length;
325 memcpy(gb_cur, lto_tlv, lto_length);
326 gb_cur += lto_length;
328 memcpy(gb_cur, wks_tlv, wks_length);
329 gb_cur += wks_length;
334 local->gb_len = gb_len;
339 int nfc_llcp_set_remote_gb(struct nfc_dev *dev, u8 *gb, u8 gb_len)
341 struct nfc_llcp_local *local = nfc_llcp_find_local(dev);
344 pr_err("No LLCP device\n");
348 memset(local->remote_gb, 0, NFC_MAX_GT_LEN);
349 memcpy(local->remote_gb, gb, gb_len);
350 local->remote_gb_len = gb_len;
352 if (local->remote_gb == NULL ||
353 local->remote_gb_len == 0)
356 if (memcmp(local->remote_gb, llcp_magic, 3)) {
357 pr_err("MAC does not support LLCP\n");
361 return nfc_llcp_parse_tlv(local,
362 &local->remote_gb[3], local->remote_gb_len - 3);
365 static void nfc_llcp_tx_work(struct work_struct *work)
367 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
371 skb = skb_dequeue(&local->tx_queue);
373 pr_debug("Sending pending skb\n");
374 nfc_data_exchange(local->dev, local->target_idx,
375 skb, nfc_llcp_recv, local);
377 nfc_llcp_send_symm(local->dev);
380 mod_timer(&local->link_timer,
381 jiffies + msecs_to_jiffies(local->remote_lto));
384 static u8 nfc_llcp_dsap(struct sk_buff *pdu)
386 return (pdu->data[0] & 0xfc) >> 2;
389 static u8 nfc_llcp_ptype(struct sk_buff *pdu)
391 return ((pdu->data[0] & 0x03) << 2) | ((pdu->data[1] & 0xc0) >> 6);
394 static u8 nfc_llcp_ssap(struct sk_buff *pdu)
396 return pdu->data[1] & 0x3f;
399 static u8 nfc_llcp_ns(struct sk_buff *pdu)
401 return pdu->data[2] >> 4;
404 static u8 nfc_llcp_nr(struct sk_buff *pdu)
406 return pdu->data[2] & 0xf;
409 static void nfc_llcp_set_nrns(struct nfc_llcp_sock *sock, struct sk_buff *pdu)
411 pdu->data[2] = (sock->send_n << 4) | ((sock->recv_n - 1) % 16);
412 sock->send_n = (sock->send_n + 1) % 16;
413 sock->recv_ack_n = (sock->recv_n - 1) % 16;
416 static struct nfc_llcp_sock *nfc_llcp_sock_get(struct nfc_llcp_local *local,
419 struct nfc_llcp_sock *sock, *llcp_sock, *n;
421 if (ssap == 0 && dsap == 0)
424 mutex_lock(&local->socket_lock);
425 sock = local->sockets[ssap];
427 mutex_unlock(&local->socket_lock);
431 pr_debug("root dsap %d (%d)\n", sock->dsap, dsap);
433 if (sock->dsap == dsap) {
434 sock_hold(&sock->sk);
435 mutex_unlock(&local->socket_lock);
439 list_for_each_entry_safe(llcp_sock, n, &sock->list, list) {
440 pr_debug("llcp_sock %p sk %p dsap %d\n", llcp_sock,
441 &llcp_sock->sk, llcp_sock->dsap);
442 if (llcp_sock->dsap == dsap) {
443 sock_hold(&llcp_sock->sk);
444 mutex_unlock(&local->socket_lock);
449 pr_err("Could not find socket for %d %d\n", ssap, dsap);
451 mutex_unlock(&local->socket_lock);
456 static void nfc_llcp_sock_put(struct nfc_llcp_sock *sock)
461 static u8 *nfc_llcp_connect_sn(struct sk_buff *skb, size_t *sn_len)
463 u8 *tlv = &skb->data[2], type, length;
464 size_t tlv_array_len = skb->len - LLCP_HEADER_SIZE, offset = 0;
466 while (offset < tlv_array_len) {
470 pr_debug("type 0x%x length %d\n", type, length);
472 if (type == LLCP_TLV_SN) {
477 offset += length + 2;
484 static void nfc_llcp_recv_connect(struct nfc_llcp_local *local,
487 struct sock *new_sk, *parent;
488 struct nfc_llcp_sock *sock, *new_sock;
489 u8 dsap, ssap, bound_sap, reason;
491 dsap = nfc_llcp_dsap(skb);
492 ssap = nfc_llcp_ssap(skb);
494 pr_debug("%d %d\n", dsap, ssap);
496 nfc_llcp_parse_tlv(local, &skb->data[LLCP_HEADER_SIZE],
497 skb->len - LLCP_HEADER_SIZE);
499 if (dsap != LLCP_SAP_SDP) {
502 mutex_lock(&local->socket_lock);
503 sock = local->sockets[dsap];
505 mutex_unlock(&local->socket_lock);
506 reason = LLCP_DM_NOBOUND;
510 sock_hold(&sock->sk);
511 mutex_unlock(&local->socket_lock);
513 lock_sock(&sock->sk);
515 if (sock->dsap == LLCP_SAP_SDP &&
516 sock->sk.sk_state == LLCP_LISTEN)
522 sn = nfc_llcp_connect_sn(skb, &sn_len);
524 reason = LLCP_DM_NOBOUND;
528 pr_debug("Service name length %zu\n", sn_len);
530 mutex_lock(&local->socket_lock);
531 for (bound_sap = 0; bound_sap < LLCP_LOCAL_SAP_OFFSET;
533 sock = local->sockets[bound_sap];
537 if (sock->service_name == NULL ||
538 sock->service_name_len == 0)
541 if (sock->service_name_len != sn_len)
544 if (sock->dsap == LLCP_SAP_SDP &&
545 sock->sk.sk_state == LLCP_LISTEN &&
546 !memcmp(sn, sock->service_name, sn_len)) {
547 pr_debug("Found service name at SAP %d\n",
549 sock_hold(&sock->sk);
550 mutex_unlock(&local->socket_lock);
552 lock_sock(&sock->sk);
557 mutex_unlock(&local->socket_lock);
560 reason = LLCP_DM_NOBOUND;
566 if (sk_acceptq_is_full(parent)) {
567 reason = LLCP_DM_REJ;
568 release_sock(&sock->sk);
573 new_sk = nfc_llcp_sock_alloc(NULL, parent->sk_type,
575 if (new_sk == NULL) {
576 reason = LLCP_DM_REJ;
577 release_sock(&sock->sk);
582 new_sock = nfc_llcp_sock(new_sk);
583 new_sock->dev = local->dev;
584 new_sock->local = local;
585 new_sock->nfc_protocol = sock->nfc_protocol;
586 new_sock->ssap = bound_sap;
587 new_sock->dsap = ssap;
588 new_sock->parent = parent;
590 pr_debug("new sock %p sk %p\n", new_sock, &new_sock->sk);
592 list_add_tail(&new_sock->list, &sock->list);
594 nfc_llcp_accept_enqueue(&sock->sk, new_sk);
596 nfc_get_device(local->dev->idx);
598 new_sk->sk_state = LLCP_CONNECTED;
600 /* Wake the listening processes */
601 parent->sk_data_ready(parent, 0);
604 nfc_llcp_send_cc(new_sock);
606 release_sock(&sock->sk);
613 nfc_llcp_send_dm(local, dsap, ssap, reason);
619 void nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock)
621 struct nfc_llcp_local *local = sock->local;
623 pr_debug("Remote ready %d tx queue len %d remote rw %d",
624 sock->remote_ready, skb_queue_len(&sock->tx_pending_queue),
627 /* Try to queue some I frames for transmission */
628 while (sock->remote_ready &&
629 skb_queue_len(&sock->tx_pending_queue) < local->remote_rw) {
630 struct sk_buff *pdu, *pending_pdu;
632 pdu = skb_dequeue(&sock->tx_queue);
636 /* Update N(S)/N(R) */
637 nfc_llcp_set_nrns(sock, pdu);
639 pending_pdu = skb_clone(pdu, GFP_KERNEL);
641 skb_queue_tail(&local->tx_queue, pdu);
642 skb_queue_tail(&sock->tx_pending_queue, pending_pdu);
646 static void nfc_llcp_recv_hdlc(struct nfc_llcp_local *local,
649 struct nfc_llcp_sock *llcp_sock;
651 u8 dsap, ssap, ptype, ns, nr;
653 ptype = nfc_llcp_ptype(skb);
654 dsap = nfc_llcp_dsap(skb);
655 ssap = nfc_llcp_ssap(skb);
656 ns = nfc_llcp_ns(skb);
657 nr = nfc_llcp_nr(skb);
659 pr_debug("%d %d R %d S %d\n", dsap, ssap, nr, ns);
661 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
662 if (llcp_sock == NULL) {
663 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
669 if (sk->sk_state == LLCP_CLOSED) {
671 nfc_llcp_sock_put(llcp_sock);
674 if (ns == llcp_sock->recv_n)
675 llcp_sock->recv_n = (llcp_sock->recv_n + 1) % 16;
677 pr_err("Received out of sequence I PDU\n");
679 /* Pass the payload upstream */
680 if (ptype == LLCP_PDU_I) {
681 pr_debug("I frame, queueing on %p\n", &llcp_sock->sk);
683 skb_pull(skb, LLCP_HEADER_SIZE + LLCP_SEQUENCE_SIZE);
684 if (sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
685 pr_err("receive queue is full\n");
686 skb_queue_head(&llcp_sock->tx_backlog_queue, skb);
690 /* Remove skbs from the pending queue */
691 if (llcp_sock->send_ack_n != nr) {
692 struct sk_buff *s, *tmp;
694 llcp_sock->send_ack_n = nr;
696 skb_queue_walk_safe(&llcp_sock->tx_pending_queue, s, tmp)
697 if (nfc_llcp_ns(s) <= nr) {
698 skb_unlink(s, &llcp_sock->tx_pending_queue);
703 nfc_llcp_queue_i_frames(llcp_sock);
706 nfc_llcp_sock_put(llcp_sock);
709 static void nfc_llcp_recv_disc(struct nfc_llcp_local *local,
712 struct nfc_llcp_sock *llcp_sock;
716 dsap = nfc_llcp_dsap(skb);
717 ssap = nfc_llcp_ssap(skb);
719 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
720 if (llcp_sock == NULL) {
721 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
727 if (sk->sk_state == LLCP_CLOSED) {
729 nfc_llcp_sock_put(llcp_sock);
733 if (sk->sk_state == LLCP_CONNECTED) {
734 nfc_put_device(local->dev);
735 sk->sk_state = LLCP_CLOSED;
736 sk->sk_state_change(sk);
739 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_DISC);
742 nfc_llcp_sock_put(llcp_sock);
745 static void nfc_llcp_recv_cc(struct nfc_llcp_local *local,
748 struct nfc_llcp_sock *llcp_sock;
752 dsap = nfc_llcp_dsap(skb);
753 ssap = nfc_llcp_ssap(skb);
755 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
757 if (llcp_sock == NULL)
758 llcp_sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
760 if (llcp_sock == NULL) {
761 pr_err("Invalid CC\n");
762 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
767 llcp_sock->dsap = ssap;
769 nfc_llcp_parse_tlv(local, &skb->data[LLCP_HEADER_SIZE],
770 skb->len - LLCP_HEADER_SIZE);
772 nfc_llcp_sock_put(llcp_sock);
775 static void nfc_llcp_rx_work(struct work_struct *work)
777 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
779 u8 dsap, ssap, ptype;
782 skb = local->rx_pending;
784 pr_debug("No pending SKB\n");
788 ptype = nfc_llcp_ptype(skb);
789 dsap = nfc_llcp_dsap(skb);
790 ssap = nfc_llcp_ssap(skb);
792 pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap);
799 case LLCP_PDU_CONNECT:
800 pr_debug("CONNECT\n");
801 nfc_llcp_recv_connect(local, skb);
806 nfc_llcp_recv_disc(local, skb);
811 nfc_llcp_recv_cc(local, skb);
816 pr_debug("I frame\n");
817 nfc_llcp_recv_hdlc(local, skb);
822 queue_work(local->tx_wq, &local->tx_work);
823 kfree_skb(local->rx_pending);
824 local->rx_pending = NULL;
829 void nfc_llcp_recv(void *data, struct sk_buff *skb, int err)
831 struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
833 pr_debug("Received an LLCP PDU\n");
835 pr_err("err %d", err);
839 local->rx_pending = skb_get(skb);
840 del_timer(&local->link_timer);
841 queue_work(local->rx_wq, &local->rx_work);
846 void nfc_llcp_mac_is_down(struct nfc_dev *dev)
848 struct nfc_llcp_local *local;
850 local = nfc_llcp_find_local(dev);
854 /* Close and purge all existing sockets */
855 nfc_llcp_socket_release(local);
858 void nfc_llcp_mac_is_up(struct nfc_dev *dev, u32 target_idx,
859 u8 comm_mode, u8 rf_mode)
861 struct nfc_llcp_local *local;
863 pr_debug("rf mode %d\n", rf_mode);
865 local = nfc_llcp_find_local(dev);
869 local->target_idx = target_idx;
870 local->comm_mode = comm_mode;
871 local->rf_mode = rf_mode;
873 if (rf_mode == NFC_RF_INITIATOR) {
874 pr_debug("Queueing Tx work\n");
876 queue_work(local->tx_wq, &local->tx_work);
878 mod_timer(&local->link_timer,
879 jiffies + msecs_to_jiffies(local->remote_lto));
883 int nfc_llcp_register_device(struct nfc_dev *ndev)
885 struct device *dev = &ndev->dev;
886 struct nfc_llcp_local *local;
890 local = kzalloc(sizeof(struct nfc_llcp_local), GFP_KERNEL);
895 INIT_LIST_HEAD(&local->list);
896 mutex_init(&local->sdp_lock);
897 mutex_init(&local->socket_lock);
898 init_timer(&local->link_timer);
899 local->link_timer.data = (unsigned long) local;
900 local->link_timer.function = nfc_llcp_symm_timer;
902 skb_queue_head_init(&local->tx_queue);
903 INIT_WORK(&local->tx_work, nfc_llcp_tx_work);
904 snprintf(name, sizeof(name), "%s_llcp_tx_wq", dev_name(dev));
905 local->tx_wq = alloc_workqueue(name,
906 WQ_NON_REENTRANT | WQ_UNBOUND | WQ_MEM_RECLAIM, 1);
907 if (local->tx_wq == NULL) {
912 local->rx_pending = NULL;
913 INIT_WORK(&local->rx_work, nfc_llcp_rx_work);
914 snprintf(name, sizeof(name), "%s_llcp_rx_wq", dev_name(dev));
915 local->rx_wq = alloc_workqueue(name,
916 WQ_NON_REENTRANT | WQ_UNBOUND | WQ_MEM_RECLAIM, 1);
917 if (local->rx_wq == NULL) {
922 INIT_WORK(&local->timeout_work, nfc_llcp_timeout_work);
923 snprintf(name, sizeof(name), "%s_llcp_timeout_wq", dev_name(dev));
924 local->timeout_wq = alloc_workqueue(name,
925 WQ_NON_REENTRANT | WQ_UNBOUND | WQ_MEM_RECLAIM, 1);
926 if (local->timeout_wq == NULL) {
931 nfc_llcp_build_gb(local);
933 local->remote_miu = LLCP_DEFAULT_MIU;
934 local->remote_lto = LLCP_DEFAULT_LTO;
935 local->remote_rw = LLCP_DEFAULT_RW;
937 list_add(&llcp_devices, &local->list);
942 destroy_workqueue(local->rx_wq);
945 destroy_workqueue(local->tx_wq);
953 void nfc_llcp_unregister_device(struct nfc_dev *dev)
955 struct nfc_llcp_local *local = nfc_llcp_find_local(dev);
958 pr_debug("No such device\n");
962 list_del(&local->list);
963 nfc_llcp_socket_release(local);
964 del_timer_sync(&local->link_timer);
965 skb_queue_purge(&local->tx_queue);
966 destroy_workqueue(local->tx_wq);
967 destroy_workqueue(local->rx_wq);
968 kfree_skb(local->rx_pending);
972 int __init nfc_llcp_init(void)
974 INIT_LIST_HEAD(&llcp_devices);
976 return nfc_llcp_sock_init();
979 void nfc_llcp_exit(void)
981 nfc_llcp_sock_exit();