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 void nfc_llcp_sock_link(struct llcp_sock_list *l, struct sock *sk)
37 sk_add_node(sk, &l->head);
38 write_unlock(&l->lock);
41 void nfc_llcp_sock_unlink(struct llcp_sock_list *l, struct sock *sk)
45 write_unlock(&l->lock);
48 static void nfc_llcp_socket_release(struct nfc_llcp_local *local, bool listen)
51 struct hlist_node *node, *tmp;
52 struct nfc_llcp_sock *llcp_sock;
54 write_lock(&local->sockets.lock);
56 sk_for_each_safe(sk, node, tmp, &local->sockets.head) {
57 llcp_sock = nfc_llcp_sock(sk);
61 if (sk->sk_state == LLCP_CONNECTED)
62 nfc_put_device(llcp_sock->dev);
64 if (sk->sk_state == LLCP_LISTEN) {
65 struct nfc_llcp_sock *lsk, *n;
66 struct sock *accept_sk;
68 list_for_each_entry_safe(lsk, n, &llcp_sock->accept_queue,
73 nfc_llcp_accept_unlink(accept_sk);
75 accept_sk->sk_state = LLCP_CLOSED;
77 release_sock(accept_sk);
79 sock_orphan(accept_sk);
88 sk->sk_state = LLCP_CLOSED;
97 write_unlock(&local->sockets.lock);
100 struct nfc_llcp_local *nfc_llcp_local_get(struct nfc_llcp_local *local)
102 kref_get(&local->ref);
107 static void local_release(struct kref *ref)
109 struct nfc_llcp_local *local;
111 local = container_of(ref, struct nfc_llcp_local, ref);
113 list_del(&local->list);
114 nfc_llcp_socket_release(local, false);
115 del_timer_sync(&local->link_timer);
116 skb_queue_purge(&local->tx_queue);
117 destroy_workqueue(local->tx_wq);
118 destroy_workqueue(local->rx_wq);
119 destroy_workqueue(local->timeout_wq);
120 kfree_skb(local->rx_pending);
124 int nfc_llcp_local_put(struct nfc_llcp_local *local)
126 WARN_ON(local == NULL);
131 return kref_put(&local->ref, local_release);
134 static void nfc_llcp_timeout_work(struct work_struct *work)
136 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
139 nfc_dep_link_down(local->dev);
142 static void nfc_llcp_symm_timer(unsigned long data)
144 struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
146 pr_err("SYMM timeout\n");
148 queue_work(local->timeout_wq, &local->timeout_work);
151 struct nfc_llcp_local *nfc_llcp_find_local(struct nfc_dev *dev)
153 struct nfc_llcp_local *local, *n;
155 list_for_each_entry_safe(local, n, &llcp_devices, list)
156 if (local->dev == dev)
159 pr_debug("No device found\n");
164 static char *wks[] = {
172 static int nfc_llcp_wks_sap(char *service_name, size_t service_name_len)
176 pr_debug("%s\n", service_name);
178 if (service_name == NULL)
181 num_wks = ARRAY_SIZE(wks);
183 for (sap = 0; sap < num_wks; sap++) {
184 if (wks[sap] == NULL)
187 if (strncmp(wks[sap], service_name, service_name_len) == 0)
194 u8 nfc_llcp_get_sdp_ssap(struct nfc_llcp_local *local,
195 struct nfc_llcp_sock *sock)
197 mutex_lock(&local->sdp_lock);
199 if (sock->service_name != NULL && sock->service_name_len > 0) {
200 int ssap = nfc_llcp_wks_sap(sock->service_name,
201 sock->service_name_len);
204 pr_debug("WKS %d\n", ssap);
206 /* This is a WKS, let's check if it's free */
207 if (local->local_wks & BIT(ssap)) {
208 mutex_unlock(&local->sdp_lock);
213 set_bit(ssap, &local->local_wks);
214 mutex_unlock(&local->sdp_lock);
220 * This is not a well known service,
221 * we should try to find a local SDP free spot
223 ssap = find_first_zero_bit(&local->local_sdp, LLCP_SDP_NUM_SAP);
224 if (ssap == LLCP_SDP_NUM_SAP) {
225 mutex_unlock(&local->sdp_lock);
230 pr_debug("SDP ssap %d\n", LLCP_WKS_NUM_SAP + ssap);
232 set_bit(ssap, &local->local_sdp);
233 mutex_unlock(&local->sdp_lock);
235 return LLCP_WKS_NUM_SAP + ssap;
237 } else if (sock->ssap != 0 && sock->ssap < LLCP_WKS_NUM_SAP) {
238 if (!test_bit(sock->ssap, &local->local_wks)) {
239 set_bit(sock->ssap, &local->local_wks);
240 mutex_unlock(&local->sdp_lock);
246 mutex_unlock(&local->sdp_lock);
251 u8 nfc_llcp_get_local_ssap(struct nfc_llcp_local *local)
255 mutex_lock(&local->sdp_lock);
257 local_ssap = find_first_zero_bit(&local->local_sap, LLCP_LOCAL_NUM_SAP);
258 if (local_ssap == LLCP_LOCAL_NUM_SAP) {
259 mutex_unlock(&local->sdp_lock);
263 set_bit(local_ssap, &local->local_sap);
265 mutex_unlock(&local->sdp_lock);
267 return local_ssap + LLCP_LOCAL_SAP_OFFSET;
270 void nfc_llcp_put_ssap(struct nfc_llcp_local *local, u8 ssap)
275 if (ssap < LLCP_WKS_NUM_SAP) {
277 sdp = &local->local_wks;
278 } else if (ssap < LLCP_LOCAL_NUM_SAP) {
279 local_ssap = ssap - LLCP_WKS_NUM_SAP;
280 sdp = &local->local_sdp;
281 } else if (ssap < LLCP_MAX_SAP) {
282 local_ssap = ssap - LLCP_LOCAL_NUM_SAP;
283 sdp = &local->local_sap;
288 mutex_lock(&local->sdp_lock);
290 clear_bit(local_ssap, sdp);
292 mutex_unlock(&local->sdp_lock);
295 static int nfc_llcp_build_gb(struct nfc_llcp_local *local)
297 u8 *gb_cur, *version_tlv, version, version_length;
298 u8 *lto_tlv, lto, lto_length;
299 u8 *wks_tlv, wks_length;
300 u8 *miux_tlv, miux_length;
304 version = LLCP_VERSION_11;
305 version_tlv = nfc_llcp_build_tlv(LLCP_TLV_VERSION, &version,
307 gb_len += version_length;
311 lto_tlv = nfc_llcp_build_tlv(LLCP_TLV_LTO, <o, 1, <o_length);
312 gb_len += lto_length;
314 pr_debug("Local wks 0x%lx\n", local->local_wks);
315 wks_tlv = nfc_llcp_build_tlv(LLCP_TLV_WKS, (u8 *)&local->local_wks, 2,
317 gb_len += wks_length;
319 miux = cpu_to_be16(LLCP_MAX_MIUX);
320 miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&miux, 0,
322 gb_len += miux_length;
324 gb_len += ARRAY_SIZE(llcp_magic);
326 if (gb_len > NFC_MAX_GT_LEN) {
333 memcpy(gb_cur, llcp_magic, ARRAY_SIZE(llcp_magic));
334 gb_cur += ARRAY_SIZE(llcp_magic);
336 memcpy(gb_cur, version_tlv, version_length);
337 gb_cur += version_length;
339 memcpy(gb_cur, lto_tlv, lto_length);
340 gb_cur += lto_length;
342 memcpy(gb_cur, wks_tlv, wks_length);
343 gb_cur += wks_length;
345 memcpy(gb_cur, miux_tlv, miux_length);
346 gb_cur += miux_length;
351 local->gb_len = gb_len;
356 u8 *nfc_llcp_general_bytes(struct nfc_dev *dev, size_t *general_bytes_len)
358 struct nfc_llcp_local *local;
360 local = nfc_llcp_find_local(dev);
362 *general_bytes_len = 0;
366 nfc_llcp_build_gb(local);
368 *general_bytes_len = local->gb_len;
373 int nfc_llcp_set_remote_gb(struct nfc_dev *dev, u8 *gb, u8 gb_len)
375 struct nfc_llcp_local *local = nfc_llcp_find_local(dev);
378 pr_err("No LLCP device\n");
382 memset(local->remote_gb, 0, NFC_MAX_GT_LEN);
383 memcpy(local->remote_gb, gb, gb_len);
384 local->remote_gb_len = gb_len;
386 if (local->remote_gb == NULL || local->remote_gb_len == 0)
389 if (memcmp(local->remote_gb, llcp_magic, 3)) {
390 pr_err("MAC does not support LLCP\n");
394 return nfc_llcp_parse_gb_tlv(local,
395 &local->remote_gb[3],
396 local->remote_gb_len - 3);
399 static u8 nfc_llcp_dsap(struct sk_buff *pdu)
401 return (pdu->data[0] & 0xfc) >> 2;
404 static u8 nfc_llcp_ptype(struct sk_buff *pdu)
406 return ((pdu->data[0] & 0x03) << 2) | ((pdu->data[1] & 0xc0) >> 6);
409 static u8 nfc_llcp_ssap(struct sk_buff *pdu)
411 return pdu->data[1] & 0x3f;
414 static u8 nfc_llcp_ns(struct sk_buff *pdu)
416 return pdu->data[2] >> 4;
419 static u8 nfc_llcp_nr(struct sk_buff *pdu)
421 return pdu->data[2] & 0xf;
424 static void nfc_llcp_set_nrns(struct nfc_llcp_sock *sock, struct sk_buff *pdu)
426 pdu->data[2] = (sock->send_n << 4) | (sock->recv_n);
427 sock->send_n = (sock->send_n + 1) % 16;
428 sock->recv_ack_n = (sock->recv_n - 1) % 16;
431 static void nfc_llcp_tx_work(struct work_struct *work)
433 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
437 struct nfc_llcp_sock *llcp_sock;
439 skb = skb_dequeue(&local->tx_queue);
442 llcp_sock = nfc_llcp_sock(sk);
443 if (llcp_sock != NULL) {
446 pr_debug("Sending pending skb\n");
447 print_hex_dump(KERN_DEBUG, "LLCP Tx: ",
448 DUMP_PREFIX_OFFSET, 16, 1,
449 skb->data, skb->len, true);
451 ret = nfc_data_exchange(local->dev, local->target_idx,
452 skb, nfc_llcp_recv, local);
454 if (!ret && nfc_llcp_ptype(skb) == LLCP_PDU_I) {
456 skb_queue_tail(&llcp_sock->tx_pending_queue,
460 nfc_llcp_send_symm(local->dev);
463 nfc_llcp_send_symm(local->dev);
466 mod_timer(&local->link_timer,
467 jiffies + msecs_to_jiffies(2 * local->remote_lto));
470 static struct nfc_llcp_sock *nfc_llcp_connecting_sock_get(struct nfc_llcp_local *local,
474 struct nfc_llcp_sock *llcp_sock;
475 struct hlist_node *node;
477 read_lock(&local->connecting_sockets.lock);
479 sk_for_each(sk, node, &local->connecting_sockets.head) {
480 llcp_sock = nfc_llcp_sock(sk);
482 if (llcp_sock->ssap == ssap) {
483 sock_hold(&llcp_sock->sk);
491 read_unlock(&local->connecting_sockets.lock);
496 static struct nfc_llcp_sock *nfc_llcp_sock_get(struct nfc_llcp_local *local,
500 struct hlist_node *node;
501 struct nfc_llcp_sock *llcp_sock;
503 pr_debug("ssap dsap %d %d\n", ssap, dsap);
505 if (ssap == 0 && dsap == 0)
508 read_lock(&local->sockets.lock);
512 sk_for_each(sk, node, &local->sockets.head) {
513 llcp_sock = nfc_llcp_sock(sk);
515 if (llcp_sock->ssap == ssap &&
516 llcp_sock->dsap == dsap)
520 read_unlock(&local->sockets.lock);
522 if (llcp_sock == NULL)
525 sock_hold(&llcp_sock->sk);
530 static struct nfc_llcp_sock *nfc_llcp_sock_get_sn(struct nfc_llcp_local *local,
531 u8 *sn, size_t sn_len)
534 struct hlist_node *node;
535 struct nfc_llcp_sock *llcp_sock;
537 pr_debug("sn %zd\n", sn_len);
539 if (sn == NULL || sn_len == 0)
542 read_lock(&local->sockets.lock);
546 sk_for_each(sk, node, &local->sockets.head) {
547 llcp_sock = nfc_llcp_sock(sk);
549 if (llcp_sock->sk.sk_state != LLCP_LISTEN)
552 if (llcp_sock->service_name == NULL ||
553 llcp_sock->service_name_len == 0)
556 if (llcp_sock->service_name_len != sn_len)
559 if (memcmp(sn, llcp_sock->service_name, sn_len) == 0)
563 read_unlock(&local->sockets.lock);
565 if (llcp_sock == NULL)
568 sock_hold(&llcp_sock->sk);
573 static void nfc_llcp_sock_put(struct nfc_llcp_sock *sock)
578 static u8 *nfc_llcp_connect_sn(struct sk_buff *skb, size_t *sn_len)
580 u8 *tlv = &skb->data[2], type, length;
581 size_t tlv_array_len = skb->len - LLCP_HEADER_SIZE, offset = 0;
583 while (offset < tlv_array_len) {
587 pr_debug("type 0x%x length %d\n", type, length);
589 if (type == LLCP_TLV_SN) {
594 offset += length + 2;
601 static void nfc_llcp_recv_connect(struct nfc_llcp_local *local,
604 struct sock *new_sk, *parent;
605 struct nfc_llcp_sock *sock, *new_sock;
606 u8 dsap, ssap, reason;
608 dsap = nfc_llcp_dsap(skb);
609 ssap = nfc_llcp_ssap(skb);
611 pr_debug("%d %d\n", dsap, ssap);
613 if (dsap != LLCP_SAP_SDP) {
614 sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
615 if (sock == NULL || sock->sk.sk_state != LLCP_LISTEN) {
616 reason = LLCP_DM_NOBOUND;
623 sn = nfc_llcp_connect_sn(skb, &sn_len);
625 reason = LLCP_DM_NOBOUND;
629 pr_debug("Service name length %zu\n", sn_len);
631 sock = nfc_llcp_sock_get_sn(local, sn, sn_len);
633 reason = LLCP_DM_NOBOUND;
638 lock_sock(&sock->sk);
642 if (sk_acceptq_is_full(parent)) {
643 reason = LLCP_DM_REJ;
644 release_sock(&sock->sk);
649 new_sk = nfc_llcp_sock_alloc(NULL, parent->sk_type, GFP_ATOMIC);
650 if (new_sk == NULL) {
651 reason = LLCP_DM_REJ;
652 release_sock(&sock->sk);
657 new_sock = nfc_llcp_sock(new_sk);
658 new_sock->dev = local->dev;
659 new_sock->local = nfc_llcp_local_get(local);
660 new_sock->miu = local->remote_miu;
661 new_sock->nfc_protocol = sock->nfc_protocol;
662 new_sock->ssap = sock->ssap;
663 new_sock->dsap = ssap;
664 new_sock->target_idx = local->target_idx;
665 new_sock->parent = parent;
667 nfc_llcp_parse_connection_tlv(new_sock, &skb->data[LLCP_HEADER_SIZE],
668 skb->len - LLCP_HEADER_SIZE);
670 pr_debug("new sock %p sk %p\n", new_sock, &new_sock->sk);
672 nfc_llcp_sock_link(&local->sockets, new_sk);
674 nfc_llcp_accept_enqueue(&sock->sk, new_sk);
676 nfc_get_device(local->dev->idx);
678 new_sk->sk_state = LLCP_CONNECTED;
680 /* Wake the listening processes */
681 parent->sk_data_ready(parent, 0);
684 nfc_llcp_send_cc(new_sock);
686 release_sock(&sock->sk);
693 nfc_llcp_send_dm(local, dsap, ssap, reason);
699 int nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock)
702 struct nfc_llcp_local *local = sock->local;
704 pr_debug("Remote ready %d tx queue len %d remote rw %d",
705 sock->remote_ready, skb_queue_len(&sock->tx_pending_queue),
708 /* Try to queue some I frames for transmission */
709 while (sock->remote_ready &&
710 skb_queue_len(&sock->tx_pending_queue) < sock->rw) {
713 pdu = skb_dequeue(&sock->tx_queue);
717 /* Update N(S)/N(R) */
718 nfc_llcp_set_nrns(sock, pdu);
720 skb_queue_tail(&local->tx_queue, pdu);
727 static void nfc_llcp_recv_hdlc(struct nfc_llcp_local *local,
730 struct nfc_llcp_sock *llcp_sock;
732 u8 dsap, ssap, ptype, ns, nr;
734 ptype = nfc_llcp_ptype(skb);
735 dsap = nfc_llcp_dsap(skb);
736 ssap = nfc_llcp_ssap(skb);
737 ns = nfc_llcp_ns(skb);
738 nr = nfc_llcp_nr(skb);
740 pr_debug("%d %d R %d S %d\n", dsap, ssap, nr, ns);
742 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
743 if (llcp_sock == NULL) {
744 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
750 if (sk->sk_state == LLCP_CLOSED) {
752 nfc_llcp_sock_put(llcp_sock);
755 /* Pass the payload upstream */
756 if (ptype == LLCP_PDU_I) {
757 pr_debug("I frame, queueing on %p\n", &llcp_sock->sk);
759 if (ns == llcp_sock->recv_n)
760 llcp_sock->recv_n = (llcp_sock->recv_n + 1) % 16;
762 pr_err("Received out of sequence I PDU\n");
764 skb_pull(skb, LLCP_HEADER_SIZE + LLCP_SEQUENCE_SIZE);
765 if (sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
766 pr_err("receive queue is full\n");
767 skb_queue_head(&llcp_sock->tx_backlog_queue, skb);
771 /* Remove skbs from the pending queue */
772 if (llcp_sock->send_ack_n != nr) {
773 struct sk_buff *s, *tmp;
775 llcp_sock->send_ack_n = nr;
777 /* Remove and free all skbs until ns == nr */
778 skb_queue_walk_safe(&llcp_sock->tx_pending_queue, s, tmp) {
779 skb_unlink(s, &llcp_sock->tx_pending_queue);
782 if (nfc_llcp_ns(s) == nr)
786 /* Re-queue the remaining skbs for transmission */
787 skb_queue_reverse_walk_safe(&llcp_sock->tx_pending_queue,
789 skb_unlink(s, &llcp_sock->tx_pending_queue);
790 skb_queue_head(&local->tx_queue, s);
794 if (ptype == LLCP_PDU_RR)
795 llcp_sock->remote_ready = true;
796 else if (ptype == LLCP_PDU_RNR)
797 llcp_sock->remote_ready = false;
799 if (nfc_llcp_queue_i_frames(llcp_sock) == 0 && ptype == LLCP_PDU_I)
800 nfc_llcp_send_rr(llcp_sock);
803 nfc_llcp_sock_put(llcp_sock);
806 static void nfc_llcp_recv_disc(struct nfc_llcp_local *local,
809 struct nfc_llcp_sock *llcp_sock;
813 dsap = nfc_llcp_dsap(skb);
814 ssap = nfc_llcp_ssap(skb);
816 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
817 if (llcp_sock == NULL) {
818 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
824 if (sk->sk_state == LLCP_CLOSED) {
826 nfc_llcp_sock_put(llcp_sock);
829 if (sk->sk_state == LLCP_CONNECTED) {
830 nfc_put_device(local->dev);
831 sk->sk_state = LLCP_CLOSED;
832 sk->sk_state_change(sk);
835 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_DISC);
838 nfc_llcp_sock_put(llcp_sock);
841 static void nfc_llcp_recv_cc(struct nfc_llcp_local *local, struct sk_buff *skb)
843 struct nfc_llcp_sock *llcp_sock;
847 dsap = nfc_llcp_dsap(skb);
848 ssap = nfc_llcp_ssap(skb);
850 llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
851 if (llcp_sock == NULL) {
852 pr_err("Invalid CC\n");
853 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
860 /* Unlink from connecting and link to the client array */
861 nfc_llcp_sock_unlink(&local->connecting_sockets, sk);
862 nfc_llcp_sock_link(&local->sockets, sk);
863 llcp_sock->dsap = ssap;
865 nfc_llcp_parse_connection_tlv(llcp_sock, &skb->data[LLCP_HEADER_SIZE],
866 skb->len - LLCP_HEADER_SIZE);
868 sk->sk_state = LLCP_CONNECTED;
869 sk->sk_state_change(sk);
871 nfc_llcp_sock_put(llcp_sock);
874 static void nfc_llcp_rx_work(struct work_struct *work)
876 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
878 u8 dsap, ssap, ptype;
881 skb = local->rx_pending;
883 pr_debug("No pending SKB\n");
887 ptype = nfc_llcp_ptype(skb);
888 dsap = nfc_llcp_dsap(skb);
889 ssap = nfc_llcp_ssap(skb);
891 pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap);
893 if (ptype != LLCP_PDU_SYMM)
894 print_hex_dump(KERN_DEBUG, "LLCP Rx: ", DUMP_PREFIX_OFFSET,
895 16, 1, skb->data, skb->len, true);
902 case LLCP_PDU_CONNECT:
903 pr_debug("CONNECT\n");
904 nfc_llcp_recv_connect(local, skb);
909 nfc_llcp_recv_disc(local, skb);
914 nfc_llcp_recv_cc(local, skb);
920 pr_debug("I frame\n");
921 nfc_llcp_recv_hdlc(local, skb);
926 queue_work(local->tx_wq, &local->tx_work);
927 kfree_skb(local->rx_pending);
928 local->rx_pending = NULL;
933 void nfc_llcp_recv(void *data, struct sk_buff *skb, int err)
935 struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
937 pr_debug("Received an LLCP PDU\n");
939 pr_err("err %d\n", err);
943 local->rx_pending = skb_get(skb);
944 del_timer(&local->link_timer);
945 queue_work(local->rx_wq, &local->rx_work);
950 int nfc_llcp_data_received(struct nfc_dev *dev, struct sk_buff *skb)
952 struct nfc_llcp_local *local;
954 local = nfc_llcp_find_local(dev);
958 local->rx_pending = skb_get(skb);
959 del_timer(&local->link_timer);
960 queue_work(local->rx_wq, &local->rx_work);
965 void nfc_llcp_mac_is_down(struct nfc_dev *dev)
967 struct nfc_llcp_local *local;
969 local = nfc_llcp_find_local(dev);
973 /* Close and purge all existing sockets */
974 nfc_llcp_socket_release(local, true);
977 void nfc_llcp_mac_is_up(struct nfc_dev *dev, u32 target_idx,
978 u8 comm_mode, u8 rf_mode)
980 struct nfc_llcp_local *local;
982 pr_debug("rf mode %d\n", rf_mode);
984 local = nfc_llcp_find_local(dev);
988 local->target_idx = target_idx;
989 local->comm_mode = comm_mode;
990 local->rf_mode = rf_mode;
992 if (rf_mode == NFC_RF_INITIATOR) {
993 pr_debug("Queueing Tx work\n");
995 queue_work(local->tx_wq, &local->tx_work);
997 mod_timer(&local->link_timer,
998 jiffies + msecs_to_jiffies(local->remote_lto));
1002 int nfc_llcp_register_device(struct nfc_dev *ndev)
1004 struct device *dev = &ndev->dev;
1005 struct nfc_llcp_local *local;
1009 local = kzalloc(sizeof(struct nfc_llcp_local), GFP_KERNEL);
1014 INIT_LIST_HEAD(&local->list);
1015 kref_init(&local->ref);
1016 mutex_init(&local->sdp_lock);
1017 init_timer(&local->link_timer);
1018 local->link_timer.data = (unsigned long) local;
1019 local->link_timer.function = nfc_llcp_symm_timer;
1021 skb_queue_head_init(&local->tx_queue);
1022 INIT_WORK(&local->tx_work, nfc_llcp_tx_work);
1023 snprintf(name, sizeof(name), "%s_llcp_tx_wq", dev_name(dev));
1025 alloc_workqueue(name,
1026 WQ_NON_REENTRANT | WQ_UNBOUND | WQ_MEM_RECLAIM,
1028 if (local->tx_wq == NULL) {
1033 local->rx_pending = NULL;
1034 INIT_WORK(&local->rx_work, nfc_llcp_rx_work);
1035 snprintf(name, sizeof(name), "%s_llcp_rx_wq", dev_name(dev));
1037 alloc_workqueue(name,
1038 WQ_NON_REENTRANT | WQ_UNBOUND | WQ_MEM_RECLAIM,
1040 if (local->rx_wq == NULL) {
1045 INIT_WORK(&local->timeout_work, nfc_llcp_timeout_work);
1046 snprintf(name, sizeof(name), "%s_llcp_timeout_wq", dev_name(dev));
1048 alloc_workqueue(name,
1049 WQ_NON_REENTRANT | WQ_UNBOUND | WQ_MEM_RECLAIM,
1051 if (local->timeout_wq == NULL) {
1056 local->sockets.lock = __RW_LOCK_UNLOCKED(local->sockets.lock);
1057 local->connecting_sockets.lock = __RW_LOCK_UNLOCKED(local->connecting_sockets.lock);
1059 nfc_llcp_build_gb(local);
1061 local->remote_miu = LLCP_DEFAULT_MIU;
1062 local->remote_lto = LLCP_DEFAULT_LTO;
1064 list_add(&llcp_devices, &local->list);
1069 destroy_workqueue(local->rx_wq);
1072 destroy_workqueue(local->tx_wq);
1080 void nfc_llcp_unregister_device(struct nfc_dev *dev)
1082 struct nfc_llcp_local *local = nfc_llcp_find_local(dev);
1084 if (local == NULL) {
1085 pr_debug("No such device\n");
1089 nfc_llcp_local_put(local);
1092 int __init nfc_llcp_init(void)
1094 INIT_LIST_HEAD(&llcp_devices);
1096 return nfc_llcp_sock_init();
1099 void nfc_llcp_exit(void)
1101 nfc_llcp_sock_exit();