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;
40 mutex_lock(&local->socket_lock);
42 for (i = 0; i < LLCP_MAX_SAP; i++) {
43 parent = local->sockets[i];
47 /* Release all child sockets */
48 list_for_each_entry_safe(s, n, &parent->list, list) {
49 list_del_init(&s->list);
54 if (sk->sk_state == LLCP_CONNECTED)
55 nfc_put_device(s->dev);
57 sk->sk_state = LLCP_CLOSED;
66 parent_sk = &parent->sk;
70 if (parent_sk->sk_state == LLCP_LISTEN) {
71 struct nfc_llcp_sock *lsk, *n;
72 struct sock *accept_sk;
74 list_for_each_entry_safe(lsk, n, &parent->accept_queue,
79 nfc_llcp_accept_unlink(accept_sk);
81 accept_sk->sk_state = LLCP_CLOSED;
83 release_sock(accept_sk);
85 sock_orphan(accept_sk);
91 if (parent_sk->sk_state == LLCP_CONNECTED)
92 nfc_put_device(parent->dev);
94 parent_sk->sk_state = LLCP_CLOSED;
96 release_sock(parent_sk);
98 sock_orphan(parent_sk);
100 parent->local = NULL;
103 mutex_unlock(&local->socket_lock);
106 static void nfc_llcp_clear_sdp(struct nfc_llcp_local *local)
108 mutex_lock(&local->sdp_lock);
110 local->local_wks = 0;
111 local->local_sdp = 0;
112 local->local_sap = 0;
114 mutex_unlock(&local->sdp_lock);
117 static void nfc_llcp_timeout_work(struct work_struct *work)
119 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
122 nfc_dep_link_down(local->dev);
125 static void nfc_llcp_symm_timer(unsigned long data)
127 struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
129 pr_err("SYMM timeout\n");
131 queue_work(local->timeout_wq, &local->timeout_work);
134 struct nfc_llcp_local *nfc_llcp_find_local(struct nfc_dev *dev)
136 struct nfc_llcp_local *local, *n;
138 list_for_each_entry_safe(local, n, &llcp_devices, list)
139 if (local->dev == dev)
142 pr_debug("No device found\n");
147 static char *wks[] = {
155 static int nfc_llcp_wks_sap(char *service_name, size_t service_name_len)
159 pr_debug("%s\n", service_name);
161 if (service_name == NULL)
164 num_wks = ARRAY_SIZE(wks);
166 for (sap = 0; sap < num_wks; sap++) {
167 if (wks[sap] == NULL)
170 if (strncmp(wks[sap], service_name, service_name_len) == 0)
177 u8 nfc_llcp_get_sdp_ssap(struct nfc_llcp_local *local,
178 struct nfc_llcp_sock *sock)
180 mutex_lock(&local->sdp_lock);
182 if (sock->service_name != NULL && sock->service_name_len > 0) {
183 int ssap = nfc_llcp_wks_sap(sock->service_name,
184 sock->service_name_len);
187 pr_debug("WKS %d\n", ssap);
189 /* This is a WKS, let's check if it's free */
190 if (local->local_wks & BIT(ssap)) {
191 mutex_unlock(&local->sdp_lock);
196 set_bit(ssap, &local->local_wks);
197 mutex_unlock(&local->sdp_lock);
203 * This is not a well known service,
204 * we should try to find a local SDP free spot
206 ssap = find_first_zero_bit(&local->local_sdp, LLCP_SDP_NUM_SAP);
207 if (ssap == LLCP_SDP_NUM_SAP) {
208 mutex_unlock(&local->sdp_lock);
213 pr_debug("SDP ssap %d\n", LLCP_WKS_NUM_SAP + ssap);
215 set_bit(ssap, &local->local_sdp);
216 mutex_unlock(&local->sdp_lock);
218 return LLCP_WKS_NUM_SAP + ssap;
220 } else if (sock->ssap != 0) {
221 if (sock->ssap < LLCP_WKS_NUM_SAP) {
222 if (!test_bit(sock->ssap, &local->local_wks)) {
223 set_bit(sock->ssap, &local->local_wks);
224 mutex_unlock(&local->sdp_lock);
229 } else if (sock->ssap < LLCP_SDP_NUM_SAP) {
230 if (!test_bit(sock->ssap - LLCP_WKS_NUM_SAP,
231 &local->local_sdp)) {
232 set_bit(sock->ssap - LLCP_WKS_NUM_SAP,
234 mutex_unlock(&local->sdp_lock);
241 mutex_unlock(&local->sdp_lock);
246 u8 nfc_llcp_get_local_ssap(struct nfc_llcp_local *local)
250 mutex_lock(&local->sdp_lock);
252 local_ssap = find_first_zero_bit(&local->local_sap, LLCP_LOCAL_NUM_SAP);
253 if (local_ssap == LLCP_LOCAL_NUM_SAP) {
254 mutex_unlock(&local->sdp_lock);
258 set_bit(local_ssap, &local->local_sap);
260 mutex_unlock(&local->sdp_lock);
262 return local_ssap + LLCP_LOCAL_SAP_OFFSET;
265 void nfc_llcp_put_ssap(struct nfc_llcp_local *local, u8 ssap)
270 if (ssap < LLCP_WKS_NUM_SAP) {
272 sdp = &local->local_wks;
273 } else if (ssap < LLCP_LOCAL_NUM_SAP) {
274 local_ssap = ssap - LLCP_WKS_NUM_SAP;
275 sdp = &local->local_sdp;
276 } else if (ssap < LLCP_MAX_SAP) {
277 local_ssap = ssap - LLCP_LOCAL_NUM_SAP;
278 sdp = &local->local_sap;
283 mutex_lock(&local->sdp_lock);
285 clear_bit(local_ssap, sdp);
287 mutex_unlock(&local->sdp_lock);
290 u8 *nfc_llcp_general_bytes(struct nfc_dev *dev, size_t *general_bytes_len)
292 struct nfc_llcp_local *local;
294 local = nfc_llcp_find_local(dev);
296 *general_bytes_len = 0;
300 *general_bytes_len = local->gb_len;
305 static int nfc_llcp_build_gb(struct nfc_llcp_local *local)
307 u8 *gb_cur, *version_tlv, version, version_length;
308 u8 *lto_tlv, lto, lto_length;
309 u8 *wks_tlv, wks_length;
310 u8 *miux_tlv, miux_length;
314 version = LLCP_VERSION_11;
315 version_tlv = nfc_llcp_build_tlv(LLCP_TLV_VERSION, &version,
317 gb_len += version_length;
321 lto_tlv = nfc_llcp_build_tlv(LLCP_TLV_LTO, <o, 1, <o_length);
322 gb_len += lto_length;
324 pr_debug("Local wks 0x%lx\n", local->local_wks);
325 wks_tlv = nfc_llcp_build_tlv(LLCP_TLV_WKS, (u8 *)&local->local_wks, 2,
327 gb_len += wks_length;
329 miux = cpu_to_be16(LLCP_MAX_MIUX);
330 miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&miux, 0,
332 gb_len += miux_length;
334 gb_len += ARRAY_SIZE(llcp_magic);
336 if (gb_len > NFC_MAX_GT_LEN) {
343 memcpy(gb_cur, llcp_magic, ARRAY_SIZE(llcp_magic));
344 gb_cur += ARRAY_SIZE(llcp_magic);
346 memcpy(gb_cur, version_tlv, version_length);
347 gb_cur += version_length;
349 memcpy(gb_cur, lto_tlv, lto_length);
350 gb_cur += lto_length;
352 memcpy(gb_cur, wks_tlv, wks_length);
353 gb_cur += wks_length;
355 memcpy(gb_cur, miux_tlv, miux_length);
356 gb_cur += miux_length;
361 local->gb_len = gb_len;
366 int nfc_llcp_set_remote_gb(struct nfc_dev *dev, u8 *gb, u8 gb_len)
368 struct nfc_llcp_local *local = nfc_llcp_find_local(dev);
371 pr_err("No LLCP device\n");
375 memset(local->remote_gb, 0, NFC_MAX_GT_LEN);
376 memcpy(local->remote_gb, gb, gb_len);
377 local->remote_gb_len = gb_len;
379 if (local->remote_gb == NULL || local->remote_gb_len == 0)
382 if (memcmp(local->remote_gb, llcp_magic, 3)) {
383 pr_err("MAC does not support LLCP\n");
387 return nfc_llcp_parse_tlv(local,
388 &local->remote_gb[3],
389 local->remote_gb_len - 3);
392 static void nfc_llcp_tx_work(struct work_struct *work)
394 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
398 skb = skb_dequeue(&local->tx_queue);
400 pr_debug("Sending pending skb\n");
401 print_hex_dump(KERN_DEBUG, "LLCP Tx: ", DUMP_PREFIX_OFFSET,
402 16, 1, skb->data, skb->len, true);
404 nfc_data_exchange(local->dev, local->target_idx,
405 skb, nfc_llcp_recv, local);
407 nfc_llcp_send_symm(local->dev);
410 mod_timer(&local->link_timer,
411 jiffies + msecs_to_jiffies(local->remote_lto));
414 static u8 nfc_llcp_dsap(struct sk_buff *pdu)
416 return (pdu->data[0] & 0xfc) >> 2;
419 static u8 nfc_llcp_ptype(struct sk_buff *pdu)
421 return ((pdu->data[0] & 0x03) << 2) | ((pdu->data[1] & 0xc0) >> 6);
424 static u8 nfc_llcp_ssap(struct sk_buff *pdu)
426 return pdu->data[1] & 0x3f;
429 static u8 nfc_llcp_ns(struct sk_buff *pdu)
431 return pdu->data[2] >> 4;
434 static u8 nfc_llcp_nr(struct sk_buff *pdu)
436 return pdu->data[2] & 0xf;
439 static void nfc_llcp_set_nrns(struct nfc_llcp_sock *sock, struct sk_buff *pdu)
441 pdu->data[2] = (sock->send_n << 4) | (sock->recv_n);
442 sock->send_n = (sock->send_n + 1) % 16;
443 sock->recv_ack_n = (sock->recv_n - 1) % 16;
446 static struct nfc_llcp_sock *nfc_llcp_sock_get(struct nfc_llcp_local *local,
449 struct nfc_llcp_sock *sock, *llcp_sock, *n;
451 pr_debug("ssap dsap %d %d\n", ssap, dsap);
453 if (ssap == 0 && dsap == 0)
456 mutex_lock(&local->socket_lock);
457 sock = local->sockets[ssap];
459 mutex_unlock(&local->socket_lock);
463 pr_debug("root dsap %d (%d)\n", sock->dsap, dsap);
465 if (sock->dsap == dsap) {
466 sock_hold(&sock->sk);
467 mutex_unlock(&local->socket_lock);
471 list_for_each_entry_safe(llcp_sock, n, &sock->list, list) {
472 pr_debug("llcp_sock %p sk %p dsap %d\n", llcp_sock,
473 &llcp_sock->sk, llcp_sock->dsap);
474 if (llcp_sock->dsap == dsap) {
475 sock_hold(&llcp_sock->sk);
476 mutex_unlock(&local->socket_lock);
481 pr_err("Could not find socket for %d %d\n", ssap, dsap);
483 mutex_unlock(&local->socket_lock);
488 static void nfc_llcp_sock_put(struct nfc_llcp_sock *sock)
493 static u8 *nfc_llcp_connect_sn(struct sk_buff *skb, size_t *sn_len)
495 u8 *tlv = &skb->data[2], type, length;
496 size_t tlv_array_len = skb->len - LLCP_HEADER_SIZE, offset = 0;
498 while (offset < tlv_array_len) {
502 pr_debug("type 0x%x length %d\n", type, length);
504 if (type == LLCP_TLV_SN) {
509 offset += length + 2;
516 static void nfc_llcp_recv_connect(struct nfc_llcp_local *local,
519 struct sock *new_sk, *parent;
520 struct nfc_llcp_sock *sock, *new_sock;
521 u8 dsap, ssap, bound_sap, reason;
523 dsap = nfc_llcp_dsap(skb);
524 ssap = nfc_llcp_ssap(skb);
526 pr_debug("%d %d\n", dsap, ssap);
528 nfc_llcp_parse_tlv(local, &skb->data[LLCP_HEADER_SIZE],
529 skb->len - LLCP_HEADER_SIZE);
531 if (dsap != LLCP_SAP_SDP) {
534 mutex_lock(&local->socket_lock);
535 sock = local->sockets[dsap];
537 mutex_unlock(&local->socket_lock);
538 reason = LLCP_DM_NOBOUND;
542 sock_hold(&sock->sk);
543 mutex_unlock(&local->socket_lock);
545 lock_sock(&sock->sk);
547 if (sock->dsap == LLCP_SAP_SDP &&
548 sock->sk.sk_state == LLCP_LISTEN)
554 sn = nfc_llcp_connect_sn(skb, &sn_len);
556 reason = LLCP_DM_NOBOUND;
560 pr_debug("Service name length %zu\n", sn_len);
562 mutex_lock(&local->socket_lock);
563 for (bound_sap = 0; bound_sap < LLCP_LOCAL_SAP_OFFSET;
565 sock = local->sockets[bound_sap];
569 if (sock->service_name == NULL ||
570 sock->service_name_len == 0)
573 if (sock->service_name_len != sn_len)
576 if (sock->dsap == LLCP_SAP_SDP &&
577 sock->sk.sk_state == LLCP_LISTEN &&
578 !memcmp(sn, sock->service_name, sn_len)) {
579 pr_debug("Found service name at SAP %d\n",
581 sock_hold(&sock->sk);
582 mutex_unlock(&local->socket_lock);
584 lock_sock(&sock->sk);
589 mutex_unlock(&local->socket_lock);
592 reason = LLCP_DM_NOBOUND;
598 if (sk_acceptq_is_full(parent)) {
599 reason = LLCP_DM_REJ;
600 release_sock(&sock->sk);
605 new_sk = nfc_llcp_sock_alloc(NULL, parent->sk_type, GFP_ATOMIC);
606 if (new_sk == NULL) {
607 reason = LLCP_DM_REJ;
608 release_sock(&sock->sk);
613 new_sock = nfc_llcp_sock(new_sk);
614 new_sock->dev = local->dev;
615 new_sock->local = local;
616 new_sock->nfc_protocol = sock->nfc_protocol;
617 new_sock->ssap = bound_sap;
618 new_sock->dsap = ssap;
619 new_sock->parent = parent;
621 pr_debug("new sock %p sk %p\n", new_sock, &new_sock->sk);
623 list_add_tail(&new_sock->list, &sock->list);
625 nfc_llcp_accept_enqueue(&sock->sk, new_sk);
627 nfc_get_device(local->dev->idx);
629 new_sk->sk_state = LLCP_CONNECTED;
631 /* Wake the listening processes */
632 parent->sk_data_ready(parent, 0);
635 nfc_llcp_send_cc(new_sock);
637 release_sock(&sock->sk);
644 nfc_llcp_send_dm(local, dsap, ssap, reason);
650 int nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock)
653 struct nfc_llcp_local *local = sock->local;
655 pr_debug("Remote ready %d tx queue len %d remote rw %d",
656 sock->remote_ready, skb_queue_len(&sock->tx_pending_queue),
659 /* Try to queue some I frames for transmission */
660 while (sock->remote_ready &&
661 skb_queue_len(&sock->tx_pending_queue) < local->remote_rw) {
662 struct sk_buff *pdu, *pending_pdu;
664 pdu = skb_dequeue(&sock->tx_queue);
668 /* Update N(S)/N(R) */
669 nfc_llcp_set_nrns(sock, pdu);
671 pending_pdu = skb_clone(pdu, GFP_KERNEL);
673 skb_queue_tail(&local->tx_queue, pdu);
674 skb_queue_tail(&sock->tx_pending_queue, pending_pdu);
681 static void nfc_llcp_recv_hdlc(struct nfc_llcp_local *local,
684 struct nfc_llcp_sock *llcp_sock;
686 u8 dsap, ssap, ptype, ns, nr;
688 ptype = nfc_llcp_ptype(skb);
689 dsap = nfc_llcp_dsap(skb);
690 ssap = nfc_llcp_ssap(skb);
691 ns = nfc_llcp_ns(skb);
692 nr = nfc_llcp_nr(skb);
694 pr_debug("%d %d R %d S %d\n", dsap, ssap, nr, ns);
696 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
697 if (llcp_sock == NULL) {
698 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
704 if (sk->sk_state == LLCP_CLOSED) {
706 nfc_llcp_sock_put(llcp_sock);
709 /* Pass the payload upstream */
710 if (ptype == LLCP_PDU_I) {
711 pr_debug("I frame, queueing on %p\n", &llcp_sock->sk);
713 if (ns == llcp_sock->recv_n)
714 llcp_sock->recv_n = (llcp_sock->recv_n + 1) % 16;
716 pr_err("Received out of sequence I PDU\n");
718 skb_pull(skb, LLCP_HEADER_SIZE + LLCP_SEQUENCE_SIZE);
719 if (sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
720 pr_err("receive queue is full\n");
721 skb_queue_head(&llcp_sock->tx_backlog_queue, skb);
725 /* Remove skbs from the pending queue */
726 if (llcp_sock->send_ack_n != nr) {
727 struct sk_buff *s, *tmp;
729 llcp_sock->send_ack_n = nr;
731 skb_queue_walk_safe(&llcp_sock->tx_pending_queue, s, tmp)
732 if (nfc_llcp_ns(s) <= nr) {
733 skb_unlink(s, &llcp_sock->tx_pending_queue);
738 if (ptype == LLCP_PDU_RR)
739 llcp_sock->remote_ready = true;
740 else if (ptype == LLCP_PDU_RNR)
741 llcp_sock->remote_ready = false;
743 if (nfc_llcp_queue_i_frames(llcp_sock) == 0)
744 nfc_llcp_send_rr(llcp_sock);
747 nfc_llcp_sock_put(llcp_sock);
750 static void nfc_llcp_recv_disc(struct nfc_llcp_local *local,
753 struct nfc_llcp_sock *llcp_sock;
757 dsap = nfc_llcp_dsap(skb);
758 ssap = nfc_llcp_ssap(skb);
760 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
761 if (llcp_sock == NULL) {
762 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
768 if (sk->sk_state == LLCP_CLOSED) {
770 nfc_llcp_sock_put(llcp_sock);
773 if (sk->sk_state == LLCP_CONNECTED) {
774 nfc_put_device(local->dev);
775 sk->sk_state = LLCP_CLOSED;
776 sk->sk_state_change(sk);
779 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_DISC);
782 nfc_llcp_sock_put(llcp_sock);
785 static void nfc_llcp_recv_cc(struct nfc_llcp_local *local, struct sk_buff *skb)
787 struct nfc_llcp_sock *llcp_sock;
791 dsap = nfc_llcp_dsap(skb);
792 ssap = nfc_llcp_ssap(skb);
794 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
796 if (llcp_sock == NULL)
797 llcp_sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
799 if (llcp_sock == NULL) {
800 pr_err("Invalid CC\n");
801 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
806 llcp_sock->dsap = ssap;
809 nfc_llcp_parse_tlv(local, &skb->data[LLCP_HEADER_SIZE],
810 skb->len - LLCP_HEADER_SIZE);
812 sk->sk_state = LLCP_CONNECTED;
813 sk->sk_state_change(sk);
815 nfc_llcp_sock_put(llcp_sock);
818 static void nfc_llcp_rx_work(struct work_struct *work)
820 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
822 u8 dsap, ssap, ptype;
825 skb = local->rx_pending;
827 pr_debug("No pending SKB\n");
831 ptype = nfc_llcp_ptype(skb);
832 dsap = nfc_llcp_dsap(skb);
833 ssap = nfc_llcp_ssap(skb);
835 pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap);
837 if (ptype != LLCP_PDU_SYMM)
838 print_hex_dump(KERN_DEBUG, "LLCP Rx: ", DUMP_PREFIX_OFFSET,
839 16, 1, skb->data, skb->len, true);
846 case LLCP_PDU_CONNECT:
847 pr_debug("CONNECT\n");
848 nfc_llcp_recv_connect(local, skb);
853 nfc_llcp_recv_disc(local, skb);
858 nfc_llcp_recv_cc(local, skb);
864 pr_debug("I frame\n");
865 nfc_llcp_recv_hdlc(local, skb);
870 queue_work(local->tx_wq, &local->tx_work);
871 kfree_skb(local->rx_pending);
872 local->rx_pending = NULL;
877 void nfc_llcp_recv(void *data, struct sk_buff *skb, int err)
879 struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
881 pr_debug("Received an LLCP PDU\n");
883 pr_err("err %d\n", err);
887 local->rx_pending = skb_get(skb);
888 del_timer(&local->link_timer);
889 queue_work(local->rx_wq, &local->rx_work);
894 void nfc_llcp_mac_is_down(struct nfc_dev *dev)
896 struct nfc_llcp_local *local;
898 local = nfc_llcp_find_local(dev);
902 nfc_llcp_clear_sdp(local);
904 /* Close and purge all existing sockets */
905 nfc_llcp_socket_release(local);
908 void nfc_llcp_mac_is_up(struct nfc_dev *dev, u32 target_idx,
909 u8 comm_mode, u8 rf_mode)
911 struct nfc_llcp_local *local;
913 pr_debug("rf mode %d\n", rf_mode);
915 local = nfc_llcp_find_local(dev);
919 local->target_idx = target_idx;
920 local->comm_mode = comm_mode;
921 local->rf_mode = rf_mode;
923 if (rf_mode == NFC_RF_INITIATOR) {
924 pr_debug("Queueing Tx work\n");
926 queue_work(local->tx_wq, &local->tx_work);
928 mod_timer(&local->link_timer,
929 jiffies + msecs_to_jiffies(local->remote_lto));
933 int nfc_llcp_register_device(struct nfc_dev *ndev)
935 struct device *dev = &ndev->dev;
936 struct nfc_llcp_local *local;
940 local = kzalloc(sizeof(struct nfc_llcp_local), GFP_KERNEL);
945 INIT_LIST_HEAD(&local->list);
946 mutex_init(&local->sdp_lock);
947 mutex_init(&local->socket_lock);
948 init_timer(&local->link_timer);
949 local->link_timer.data = (unsigned long) local;
950 local->link_timer.function = nfc_llcp_symm_timer;
952 skb_queue_head_init(&local->tx_queue);
953 INIT_WORK(&local->tx_work, nfc_llcp_tx_work);
954 snprintf(name, sizeof(name), "%s_llcp_tx_wq", dev_name(dev));
956 alloc_workqueue(name,
957 WQ_NON_REENTRANT | WQ_UNBOUND | WQ_MEM_RECLAIM,
959 if (local->tx_wq == NULL) {
964 local->rx_pending = NULL;
965 INIT_WORK(&local->rx_work, nfc_llcp_rx_work);
966 snprintf(name, sizeof(name), "%s_llcp_rx_wq", dev_name(dev));
968 alloc_workqueue(name,
969 WQ_NON_REENTRANT | WQ_UNBOUND | WQ_MEM_RECLAIM,
971 if (local->rx_wq == NULL) {
976 INIT_WORK(&local->timeout_work, nfc_llcp_timeout_work);
977 snprintf(name, sizeof(name), "%s_llcp_timeout_wq", dev_name(dev));
979 alloc_workqueue(name,
980 WQ_NON_REENTRANT | WQ_UNBOUND | WQ_MEM_RECLAIM,
982 if (local->timeout_wq == NULL) {
987 nfc_llcp_build_gb(local);
989 local->remote_miu = LLCP_DEFAULT_MIU;
990 local->remote_lto = LLCP_DEFAULT_LTO;
991 local->remote_rw = LLCP_DEFAULT_RW;
993 list_add(&llcp_devices, &local->list);
998 destroy_workqueue(local->rx_wq);
1001 destroy_workqueue(local->tx_wq);
1009 void nfc_llcp_unregister_device(struct nfc_dev *dev)
1011 struct nfc_llcp_local *local = nfc_llcp_find_local(dev);
1013 if (local == NULL) {
1014 pr_debug("No such device\n");
1018 list_del(&local->list);
1019 nfc_llcp_socket_release(local);
1020 del_timer_sync(&local->link_timer);
1021 skb_queue_purge(&local->tx_queue);
1022 destroy_workqueue(local->tx_wq);
1023 destroy_workqueue(local->rx_wq);
1024 kfree_skb(local->rx_pending);
1028 int __init nfc_llcp_init(void)
1030 INIT_LIST_HEAD(&llcp_devices);
1032 return nfc_llcp_sock_init();
1035 void nfc_llcp_exit(void)
1037 nfc_llcp_sock_exit();