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_clear_sdp(struct nfc_llcp_local *local)
102 mutex_lock(&local->sdp_lock);
104 local->local_wks = 0;
105 local->local_sdp = 0;
106 local->local_sap = 0;
108 mutex_unlock(&local->sdp_lock);
111 static void nfc_llcp_timeout_work(struct work_struct *work)
113 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
116 nfc_dep_link_down(local->dev);
119 static void nfc_llcp_symm_timer(unsigned long data)
121 struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
123 pr_err("SYMM timeout\n");
125 queue_work(local->timeout_wq, &local->timeout_work);
128 struct nfc_llcp_local *nfc_llcp_find_local(struct nfc_dev *dev)
130 struct nfc_llcp_local *local, *n;
132 list_for_each_entry_safe(local, n, &llcp_devices, list)
133 if (local->dev == dev)
136 pr_debug("No device found\n");
141 static char *wks[] = {
149 static int nfc_llcp_wks_sap(char *service_name, size_t service_name_len)
153 pr_debug("%s\n", service_name);
155 if (service_name == NULL)
158 num_wks = ARRAY_SIZE(wks);
160 for (sap = 0 ; sap < num_wks; sap++) {
161 if (wks[sap] == NULL)
164 if (strncmp(wks[sap], service_name, service_name_len) == 0)
171 u8 nfc_llcp_get_sdp_ssap(struct nfc_llcp_local *local,
172 struct nfc_llcp_sock *sock)
174 mutex_lock(&local->sdp_lock);
176 if (sock->service_name != NULL && sock->service_name_len > 0) {
177 int ssap = nfc_llcp_wks_sap(sock->service_name,
178 sock->service_name_len);
181 pr_debug("WKS %d\n", ssap);
183 /* This is a WKS, let's check if it's free */
184 if (local->local_wks & BIT(ssap)) {
185 mutex_unlock(&local->sdp_lock);
190 set_bit(ssap, &local->local_wks);
191 mutex_unlock(&local->sdp_lock);
197 * This is not a well known service,
198 * we should try to find a local SDP free spot
200 ssap = find_first_zero_bit(&local->local_sdp, LLCP_SDP_NUM_SAP);
201 if (ssap == LLCP_SDP_NUM_SAP) {
202 mutex_unlock(&local->sdp_lock);
207 pr_debug("SDP ssap %d\n", LLCP_WKS_NUM_SAP + ssap);
209 set_bit(ssap, &local->local_sdp);
210 mutex_unlock(&local->sdp_lock);
212 return LLCP_WKS_NUM_SAP + ssap;
214 } else if (sock->ssap != 0) {
215 if (sock->ssap < LLCP_WKS_NUM_SAP) {
216 if (!test_bit(sock->ssap, &local->local_wks)) {
217 set_bit(sock->ssap, &local->local_wks);
218 mutex_unlock(&local->sdp_lock);
223 } else if (sock->ssap < LLCP_SDP_NUM_SAP) {
224 if (!test_bit(sock->ssap - LLCP_WKS_NUM_SAP,
225 &local->local_sdp)) {
226 set_bit(sock->ssap - LLCP_WKS_NUM_SAP,
228 mutex_unlock(&local->sdp_lock);
235 mutex_unlock(&local->sdp_lock);
240 u8 nfc_llcp_get_local_ssap(struct nfc_llcp_local *local)
244 mutex_lock(&local->sdp_lock);
246 local_ssap = find_first_zero_bit(&local->local_sap, LLCP_LOCAL_NUM_SAP);
247 if (local_ssap == LLCP_LOCAL_NUM_SAP) {
248 mutex_unlock(&local->sdp_lock);
252 set_bit(local_ssap, &local->local_sap);
254 mutex_unlock(&local->sdp_lock);
256 return local_ssap + LLCP_LOCAL_SAP_OFFSET;
259 void nfc_llcp_put_ssap(struct nfc_llcp_local *local, u8 ssap)
264 if (ssap < LLCP_WKS_NUM_SAP) {
266 sdp = &local->local_wks;
267 } else if (ssap < LLCP_LOCAL_NUM_SAP) {
268 local_ssap = ssap - LLCP_WKS_NUM_SAP;
269 sdp = &local->local_sdp;
270 } else if (ssap < LLCP_MAX_SAP) {
271 local_ssap = ssap - LLCP_LOCAL_NUM_SAP;
272 sdp = &local->local_sap;
277 mutex_lock(&local->sdp_lock);
279 clear_bit(local_ssap, sdp);
281 mutex_unlock(&local->sdp_lock);
284 u8 *nfc_llcp_general_bytes(struct nfc_dev *dev, u8 *general_bytes_len)
286 struct nfc_llcp_local *local;
288 local = nfc_llcp_find_local(dev);
290 *general_bytes_len = 0;
294 *general_bytes_len = local->gb_len;
299 static int nfc_llcp_build_gb(struct nfc_llcp_local *local)
301 u8 *gb_cur, *version_tlv, version, version_length;
302 u8 *lto_tlv, lto, lto_length;
303 u8 *wks_tlv, wks_length;
306 version = LLCP_VERSION_11;
307 version_tlv = nfc_llcp_build_tlv(LLCP_TLV_VERSION, &version,
309 gb_len += version_length;
313 lto_tlv = nfc_llcp_build_tlv(LLCP_TLV_VERSION, <o, 1, <o_length);
314 gb_len += lto_length;
316 pr_debug("Local wks 0x%lx\n", local->local_wks);
317 wks_tlv = nfc_llcp_build_tlv(LLCP_TLV_WKS, (u8 *)&local->local_wks, 2,
319 gb_len += wks_length;
321 gb_len += ARRAY_SIZE(llcp_magic);
323 if (gb_len > NFC_MAX_GT_LEN) {
330 memcpy(gb_cur, llcp_magic, ARRAY_SIZE(llcp_magic));
331 gb_cur += ARRAY_SIZE(llcp_magic);
333 memcpy(gb_cur, version_tlv, version_length);
334 gb_cur += version_length;
336 memcpy(gb_cur, lto_tlv, lto_length);
337 gb_cur += lto_length;
339 memcpy(gb_cur, wks_tlv, wks_length);
340 gb_cur += wks_length;
345 local->gb_len = gb_len;
350 int nfc_llcp_set_remote_gb(struct nfc_dev *dev, u8 *gb, u8 gb_len)
352 struct nfc_llcp_local *local = nfc_llcp_find_local(dev);
355 pr_err("No LLCP device\n");
359 memset(local->remote_gb, 0, NFC_MAX_GT_LEN);
360 memcpy(local->remote_gb, gb, gb_len);
361 local->remote_gb_len = gb_len;
363 if (local->remote_gb == NULL ||
364 local->remote_gb_len == 0)
367 if (memcmp(local->remote_gb, llcp_magic, 3)) {
368 pr_err("MAC does not support LLCP\n");
372 return nfc_llcp_parse_tlv(local,
373 &local->remote_gb[3], local->remote_gb_len - 3);
376 static void nfc_llcp_tx_work(struct work_struct *work)
378 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
382 skb = skb_dequeue(&local->tx_queue);
384 pr_debug("Sending pending skb\n");
385 nfc_data_exchange(local->dev, local->target_idx,
386 skb, nfc_llcp_recv, local);
388 nfc_llcp_send_symm(local->dev);
391 mod_timer(&local->link_timer,
392 jiffies + msecs_to_jiffies(local->remote_lto));
395 static u8 nfc_llcp_dsap(struct sk_buff *pdu)
397 return (pdu->data[0] & 0xfc) >> 2;
400 static u8 nfc_llcp_ptype(struct sk_buff *pdu)
402 return ((pdu->data[0] & 0x03) << 2) | ((pdu->data[1] & 0xc0) >> 6);
405 static u8 nfc_llcp_ssap(struct sk_buff *pdu)
407 return pdu->data[1] & 0x3f;
410 static u8 nfc_llcp_ns(struct sk_buff *pdu)
412 return pdu->data[2] >> 4;
415 static u8 nfc_llcp_nr(struct sk_buff *pdu)
417 return pdu->data[2] & 0xf;
420 static void nfc_llcp_set_nrns(struct nfc_llcp_sock *sock, struct sk_buff *pdu)
422 pdu->data[2] = (sock->send_n << 4) | ((sock->recv_n - 1) % 16);
423 sock->send_n = (sock->send_n + 1) % 16;
424 sock->recv_ack_n = (sock->recv_n - 1) % 16;
427 static struct nfc_llcp_sock *nfc_llcp_sock_get(struct nfc_llcp_local *local,
430 struct nfc_llcp_sock *sock, *llcp_sock, *n;
432 if (ssap == 0 && dsap == 0)
435 mutex_lock(&local->socket_lock);
436 sock = local->sockets[ssap];
438 mutex_unlock(&local->socket_lock);
442 pr_debug("root dsap %d (%d)\n", sock->dsap, dsap);
444 if (sock->dsap == dsap) {
445 sock_hold(&sock->sk);
446 mutex_unlock(&local->socket_lock);
450 list_for_each_entry_safe(llcp_sock, n, &sock->list, list) {
451 pr_debug("llcp_sock %p sk %p dsap %d\n", llcp_sock,
452 &llcp_sock->sk, llcp_sock->dsap);
453 if (llcp_sock->dsap == dsap) {
454 sock_hold(&llcp_sock->sk);
455 mutex_unlock(&local->socket_lock);
460 pr_err("Could not find socket for %d %d\n", ssap, dsap);
462 mutex_unlock(&local->socket_lock);
467 static void nfc_llcp_sock_put(struct nfc_llcp_sock *sock)
472 static u8 *nfc_llcp_connect_sn(struct sk_buff *skb, size_t *sn_len)
474 u8 *tlv = &skb->data[2], type, length;
475 size_t tlv_array_len = skb->len - LLCP_HEADER_SIZE, offset = 0;
477 while (offset < tlv_array_len) {
481 pr_debug("type 0x%x length %d\n", type, length);
483 if (type == LLCP_TLV_SN) {
488 offset += length + 2;
495 static void nfc_llcp_recv_connect(struct nfc_llcp_local *local,
498 struct sock *new_sk, *parent;
499 struct nfc_llcp_sock *sock, *new_sock;
500 u8 dsap, ssap, bound_sap, reason;
502 dsap = nfc_llcp_dsap(skb);
503 ssap = nfc_llcp_ssap(skb);
505 pr_debug("%d %d\n", dsap, ssap);
507 nfc_llcp_parse_tlv(local, &skb->data[LLCP_HEADER_SIZE],
508 skb->len - LLCP_HEADER_SIZE);
510 if (dsap != LLCP_SAP_SDP) {
513 mutex_lock(&local->socket_lock);
514 sock = local->sockets[dsap];
516 mutex_unlock(&local->socket_lock);
517 reason = LLCP_DM_NOBOUND;
521 sock_hold(&sock->sk);
522 mutex_unlock(&local->socket_lock);
524 lock_sock(&sock->sk);
526 if (sock->dsap == LLCP_SAP_SDP &&
527 sock->sk.sk_state == LLCP_LISTEN)
533 sn = nfc_llcp_connect_sn(skb, &sn_len);
535 reason = LLCP_DM_NOBOUND;
539 pr_debug("Service name length %zu\n", sn_len);
541 mutex_lock(&local->socket_lock);
542 for (bound_sap = 0; bound_sap < LLCP_LOCAL_SAP_OFFSET;
544 sock = local->sockets[bound_sap];
548 if (sock->service_name == NULL ||
549 sock->service_name_len == 0)
552 if (sock->service_name_len != sn_len)
555 if (sock->dsap == LLCP_SAP_SDP &&
556 sock->sk.sk_state == LLCP_LISTEN &&
557 !memcmp(sn, sock->service_name, sn_len)) {
558 pr_debug("Found service name at SAP %d\n",
560 sock_hold(&sock->sk);
561 mutex_unlock(&local->socket_lock);
563 lock_sock(&sock->sk);
568 mutex_unlock(&local->socket_lock);
571 reason = LLCP_DM_NOBOUND;
577 if (sk_acceptq_is_full(parent)) {
578 reason = LLCP_DM_REJ;
579 release_sock(&sock->sk);
584 new_sk = nfc_llcp_sock_alloc(NULL, parent->sk_type,
586 if (new_sk == NULL) {
587 reason = LLCP_DM_REJ;
588 release_sock(&sock->sk);
593 new_sock = nfc_llcp_sock(new_sk);
594 new_sock->dev = local->dev;
595 new_sock->local = local;
596 new_sock->nfc_protocol = sock->nfc_protocol;
597 new_sock->ssap = bound_sap;
598 new_sock->dsap = ssap;
599 new_sock->parent = parent;
601 pr_debug("new sock %p sk %p\n", new_sock, &new_sock->sk);
603 list_add_tail(&new_sock->list, &sock->list);
605 nfc_llcp_accept_enqueue(&sock->sk, new_sk);
607 nfc_get_device(local->dev->idx);
609 new_sk->sk_state = LLCP_CONNECTED;
611 /* Wake the listening processes */
612 parent->sk_data_ready(parent, 0);
615 nfc_llcp_send_cc(new_sock);
617 release_sock(&sock->sk);
624 nfc_llcp_send_dm(local, dsap, ssap, reason);
630 void nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock)
632 struct nfc_llcp_local *local = sock->local;
634 pr_debug("Remote ready %d tx queue len %d remote rw %d",
635 sock->remote_ready, skb_queue_len(&sock->tx_pending_queue),
638 /* Try to queue some I frames for transmission */
639 while (sock->remote_ready &&
640 skb_queue_len(&sock->tx_pending_queue) < local->remote_rw) {
641 struct sk_buff *pdu, *pending_pdu;
643 pdu = skb_dequeue(&sock->tx_queue);
647 /* Update N(S)/N(R) */
648 nfc_llcp_set_nrns(sock, pdu);
650 pending_pdu = skb_clone(pdu, GFP_KERNEL);
652 skb_queue_tail(&local->tx_queue, pdu);
653 skb_queue_tail(&sock->tx_pending_queue, pending_pdu);
657 static void nfc_llcp_recv_hdlc(struct nfc_llcp_local *local,
660 struct nfc_llcp_sock *llcp_sock;
662 u8 dsap, ssap, ptype, ns, nr;
664 ptype = nfc_llcp_ptype(skb);
665 dsap = nfc_llcp_dsap(skb);
666 ssap = nfc_llcp_ssap(skb);
667 ns = nfc_llcp_ns(skb);
668 nr = nfc_llcp_nr(skb);
670 pr_debug("%d %d R %d S %d\n", dsap, ssap, nr, ns);
672 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
673 if (llcp_sock == NULL) {
674 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
680 if (sk->sk_state == LLCP_CLOSED) {
682 nfc_llcp_sock_put(llcp_sock);
685 /* Pass the payload upstream */
686 if (ptype == LLCP_PDU_I) {
687 pr_debug("I frame, queueing on %p\n", &llcp_sock->sk);
689 if (ns == llcp_sock->recv_n)
690 llcp_sock->recv_n = (llcp_sock->recv_n + 1) % 16;
692 pr_err("Received out of sequence I PDU\n");
694 skb_pull(skb, LLCP_HEADER_SIZE + LLCP_SEQUENCE_SIZE);
695 if (sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
696 pr_err("receive queue is full\n");
697 skb_queue_head(&llcp_sock->tx_backlog_queue, skb);
701 /* Remove skbs from the pending queue */
702 if (llcp_sock->send_ack_n != nr) {
703 struct sk_buff *s, *tmp;
705 llcp_sock->send_ack_n = nr;
707 skb_queue_walk_safe(&llcp_sock->tx_pending_queue, s, tmp)
708 if (nfc_llcp_ns(s) <= nr) {
709 skb_unlink(s, &llcp_sock->tx_pending_queue);
714 if (ptype == LLCP_PDU_RR)
715 llcp_sock->remote_ready = true;
716 else if (ptype == LLCP_PDU_RNR)
717 llcp_sock->remote_ready = false;
719 nfc_llcp_queue_i_frames(llcp_sock);
722 nfc_llcp_sock_put(llcp_sock);
725 static void nfc_llcp_recv_disc(struct nfc_llcp_local *local,
728 struct nfc_llcp_sock *llcp_sock;
732 dsap = nfc_llcp_dsap(skb);
733 ssap = nfc_llcp_ssap(skb);
735 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
736 if (llcp_sock == NULL) {
737 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
743 if (sk->sk_state == LLCP_CLOSED) {
745 nfc_llcp_sock_put(llcp_sock);
749 if (sk->sk_state == LLCP_CONNECTED) {
750 nfc_put_device(local->dev);
751 sk->sk_state = LLCP_CLOSED;
752 sk->sk_state_change(sk);
755 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_DISC);
758 nfc_llcp_sock_put(llcp_sock);
761 static void nfc_llcp_recv_cc(struct nfc_llcp_local *local,
764 struct nfc_llcp_sock *llcp_sock;
768 dsap = nfc_llcp_dsap(skb);
769 ssap = nfc_llcp_ssap(skb);
771 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
773 if (llcp_sock == NULL)
774 llcp_sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
776 if (llcp_sock == NULL) {
777 pr_err("Invalid CC\n");
778 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
783 llcp_sock->dsap = ssap;
785 nfc_llcp_parse_tlv(local, &skb->data[LLCP_HEADER_SIZE],
786 skb->len - LLCP_HEADER_SIZE);
788 nfc_llcp_sock_put(llcp_sock);
791 static void nfc_llcp_rx_work(struct work_struct *work)
793 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
795 u8 dsap, ssap, ptype;
798 skb = local->rx_pending;
800 pr_debug("No pending SKB\n");
804 ptype = nfc_llcp_ptype(skb);
805 dsap = nfc_llcp_dsap(skb);
806 ssap = nfc_llcp_ssap(skb);
808 pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap);
815 case LLCP_PDU_CONNECT:
816 pr_debug("CONNECT\n");
817 nfc_llcp_recv_connect(local, skb);
822 nfc_llcp_recv_disc(local, skb);
827 nfc_llcp_recv_cc(local, skb);
833 pr_debug("I frame\n");
834 nfc_llcp_recv_hdlc(local, skb);
839 queue_work(local->tx_wq, &local->tx_work);
840 kfree_skb(local->rx_pending);
841 local->rx_pending = NULL;
846 void nfc_llcp_recv(void *data, struct sk_buff *skb, int err)
848 struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
850 pr_debug("Received an LLCP PDU\n");
852 pr_err("err %d", err);
856 local->rx_pending = skb_get(skb);
857 del_timer(&local->link_timer);
858 queue_work(local->rx_wq, &local->rx_work);
863 void nfc_llcp_mac_is_down(struct nfc_dev *dev)
865 struct nfc_llcp_local *local;
867 local = nfc_llcp_find_local(dev);
871 nfc_llcp_clear_sdp(local);
873 /* Close and purge all existing sockets */
874 nfc_llcp_socket_release(local);
877 void nfc_llcp_mac_is_up(struct nfc_dev *dev, u32 target_idx,
878 u8 comm_mode, u8 rf_mode)
880 struct nfc_llcp_local *local;
882 pr_debug("rf mode %d\n", rf_mode);
884 local = nfc_llcp_find_local(dev);
888 local->target_idx = target_idx;
889 local->comm_mode = comm_mode;
890 local->rf_mode = rf_mode;
892 if (rf_mode == NFC_RF_INITIATOR) {
893 pr_debug("Queueing Tx work\n");
895 queue_work(local->tx_wq, &local->tx_work);
897 mod_timer(&local->link_timer,
898 jiffies + msecs_to_jiffies(local->remote_lto));
902 int nfc_llcp_register_device(struct nfc_dev *ndev)
904 struct device *dev = &ndev->dev;
905 struct nfc_llcp_local *local;
909 local = kzalloc(sizeof(struct nfc_llcp_local), GFP_KERNEL);
914 INIT_LIST_HEAD(&local->list);
915 mutex_init(&local->sdp_lock);
916 mutex_init(&local->socket_lock);
917 init_timer(&local->link_timer);
918 local->link_timer.data = (unsigned long) local;
919 local->link_timer.function = nfc_llcp_symm_timer;
921 skb_queue_head_init(&local->tx_queue);
922 INIT_WORK(&local->tx_work, nfc_llcp_tx_work);
923 snprintf(name, sizeof(name), "%s_llcp_tx_wq", dev_name(dev));
924 local->tx_wq = alloc_workqueue(name,
925 WQ_NON_REENTRANT | WQ_UNBOUND | WQ_MEM_RECLAIM, 1);
926 if (local->tx_wq == NULL) {
931 local->rx_pending = NULL;
932 INIT_WORK(&local->rx_work, nfc_llcp_rx_work);
933 snprintf(name, sizeof(name), "%s_llcp_rx_wq", dev_name(dev));
934 local->rx_wq = alloc_workqueue(name,
935 WQ_NON_REENTRANT | WQ_UNBOUND | WQ_MEM_RECLAIM, 1);
936 if (local->rx_wq == NULL) {
941 INIT_WORK(&local->timeout_work, nfc_llcp_timeout_work);
942 snprintf(name, sizeof(name), "%s_llcp_timeout_wq", dev_name(dev));
943 local->timeout_wq = alloc_workqueue(name,
944 WQ_NON_REENTRANT | WQ_UNBOUND | WQ_MEM_RECLAIM, 1);
945 if (local->timeout_wq == NULL) {
950 nfc_llcp_build_gb(local);
952 local->remote_miu = LLCP_DEFAULT_MIU;
953 local->remote_lto = LLCP_DEFAULT_LTO;
954 local->remote_rw = LLCP_DEFAULT_RW;
956 list_add(&llcp_devices, &local->list);
961 destroy_workqueue(local->rx_wq);
964 destroy_workqueue(local->tx_wq);
972 void nfc_llcp_unregister_device(struct nfc_dev *dev)
974 struct nfc_llcp_local *local = nfc_llcp_find_local(dev);
977 pr_debug("No such device\n");
981 list_del(&local->list);
982 nfc_llcp_socket_release(local);
983 del_timer_sync(&local->link_timer);
984 skb_queue_purge(&local->tx_queue);
985 destroy_workqueue(local->tx_wq);
986 destroy_workqueue(local->rx_wq);
987 kfree_skb(local->rx_pending);
991 int __init nfc_llcp_init(void)
993 INIT_LIST_HEAD(&llcp_devices);
995 return nfc_llcp_sock_init();
998 void nfc_llcp_exit(void)
1000 nfc_llcp_sock_exit();