2 BlueZ - Bluetooth protocol stack for Linux
3 Copyright (C) 2000-2001 Qualcomm Incorporated
5 Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License version 2 as
9 published by the Free Software Foundation;
11 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
12 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
13 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
14 IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
15 CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
16 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
17 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
18 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
20 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
21 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
22 SOFTWARE IS DISCLAIMED.
25 /* Bluetooth SCO sockets. */
27 #include <linux/module.h>
28 #include <linux/debugfs.h>
29 #include <linux/seq_file.h>
31 #include <net/bluetooth/bluetooth.h>
32 #include <net/bluetooth/hci_core.h>
33 #include <net/bluetooth/sco.h>
35 static bool disable_esco;
37 static const struct proto_ops sco_sock_ops;
39 static struct bt_sock_list sco_sk_list = {
40 .lock = __RW_LOCK_UNLOCKED(sco_sk_list.lock)
43 static void __sco_chan_add(struct sco_conn *conn, struct sock *sk, struct sock *parent);
44 static void sco_chan_del(struct sock *sk, int err);
46 static void sco_sock_close(struct sock *sk);
47 static void sco_sock_kill(struct sock *sk);
49 /* ---- SCO timers ---- */
50 static void sco_sock_timeout(unsigned long arg)
52 struct sock *sk = (struct sock *) arg;
54 BT_DBG("sock %p state %d", sk, sk->sk_state);
57 sk->sk_err = ETIMEDOUT;
58 sk->sk_state_change(sk);
65 static void sco_sock_set_timer(struct sock *sk, long timeout)
67 BT_DBG("sock %p state %d timeout %ld", sk, sk->sk_state, timeout);
68 sk_reset_timer(sk, &sk->sk_timer, jiffies + timeout);
71 static void sco_sock_clear_timer(struct sock *sk)
73 BT_DBG("sock %p state %d", sk, sk->sk_state);
74 sk_stop_timer(sk, &sk->sk_timer);
77 /* ---- SCO connections ---- */
78 static struct sco_conn *sco_conn_add(struct hci_conn *hcon)
80 struct hci_dev *hdev = hcon->hdev;
81 struct sco_conn *conn = hcon->sco_data;
86 conn = kzalloc(sizeof(struct sco_conn), GFP_ATOMIC);
90 spin_lock_init(&conn->lock);
92 hcon->sco_data = conn;
95 conn->src = &hdev->bdaddr;
96 conn->dst = &hcon->dst;
98 if (hdev->sco_mtu > 0)
99 conn->mtu = hdev->sco_mtu;
103 BT_DBG("hcon %p conn %p", hcon, conn);
108 static struct sock *sco_chan_get(struct sco_conn *conn)
110 struct sock *sk = NULL;
113 sco_conn_unlock(conn);
117 static int sco_conn_del(struct hci_conn *hcon, int err)
119 struct sco_conn *conn = hcon->sco_data;
125 BT_DBG("hcon %p conn %p, err %d", hcon, conn, err);
128 sk = sco_chan_get(conn);
131 sco_sock_clear_timer(sk);
132 sco_chan_del(sk, err);
137 hcon->sco_data = NULL;
142 static int sco_chan_add(struct sco_conn *conn, struct sock *sk,
151 __sco_chan_add(conn, sk, parent);
153 sco_conn_unlock(conn);
157 static int sco_connect(struct sock *sk)
159 bdaddr_t *src = &bt_sk(sk)->src;
160 bdaddr_t *dst = &bt_sk(sk)->dst;
161 struct sco_conn *conn;
162 struct hci_conn *hcon;
163 struct hci_dev *hdev;
166 BT_DBG("%pMR -> %pMR", src, dst);
168 hdev = hci_get_route(dst, src);
170 return -EHOSTUNREACH;
174 if (lmp_esco_capable(hdev) && !disable_esco)
179 hcon = hci_connect(hdev, type, dst, BDADDR_BREDR, BT_SECURITY_LOW,
186 conn = sco_conn_add(hcon);
193 /* Update source addr of the socket */
194 bacpy(src, conn->src);
196 err = sco_chan_add(conn, sk, NULL);
200 if (hcon->state == BT_CONNECTED) {
201 sco_sock_clear_timer(sk);
202 sk->sk_state = BT_CONNECTED;
204 sk->sk_state = BT_CONNECT;
205 sco_sock_set_timer(sk, sk->sk_sndtimeo);
209 hci_dev_unlock(hdev);
214 static int sco_send_frame(struct sock *sk, struct msghdr *msg, int len)
216 struct sco_conn *conn = sco_pi(sk)->conn;
220 /* Check outgoing MTU */
224 BT_DBG("sk %p len %d", sk, len);
226 skb = bt_skb_send_alloc(sk, len, msg->msg_flags & MSG_DONTWAIT, &err);
230 if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) {
235 hci_send_sco(conn->hcon, skb);
240 static void sco_recv_frame(struct sco_conn *conn, struct sk_buff *skb)
242 struct sock *sk = sco_chan_get(conn);
247 BT_DBG("sk %p len %d", sk, skb->len);
249 if (sk->sk_state != BT_CONNECTED)
252 if (!sock_queue_rcv_skb(sk, skb))
259 /* -------- Socket interface ---------- */
260 static struct sock *__sco_get_sock_listen_by_addr(bdaddr_t *ba)
262 struct hlist_node *node;
265 sk_for_each(sk, node, &sco_sk_list.head) {
266 if (sk->sk_state != BT_LISTEN)
269 if (!bacmp(&bt_sk(sk)->src, ba))
276 /* Find socket listening on source bdaddr.
277 * Returns closest match.
279 static struct sock *sco_get_sock_listen(bdaddr_t *src)
281 struct sock *sk = NULL, *sk1 = NULL;
282 struct hlist_node *node;
284 read_lock(&sco_sk_list.lock);
286 sk_for_each(sk, node, &sco_sk_list.head) {
287 if (sk->sk_state != BT_LISTEN)
291 if (!bacmp(&bt_sk(sk)->src, src))
295 if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY))
299 read_unlock(&sco_sk_list.lock);
301 return node ? sk : sk1;
304 static void sco_sock_destruct(struct sock *sk)
308 skb_queue_purge(&sk->sk_receive_queue);
309 skb_queue_purge(&sk->sk_write_queue);
312 static void sco_sock_cleanup_listen(struct sock *parent)
316 BT_DBG("parent %p", parent);
318 /* Close not yet accepted channels */
319 while ((sk = bt_accept_dequeue(parent, NULL))) {
324 parent->sk_state = BT_CLOSED;
325 sock_set_flag(parent, SOCK_ZAPPED);
328 /* Kill socket (only if zapped and orphan)
329 * Must be called on unlocked socket.
331 static void sco_sock_kill(struct sock *sk)
333 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
336 BT_DBG("sk %p state %d", sk, sk->sk_state);
338 /* Kill poor orphan */
339 bt_sock_unlink(&sco_sk_list, sk);
340 sock_set_flag(sk, SOCK_DEAD);
344 static void __sco_sock_close(struct sock *sk)
346 BT_DBG("sk %p state %d socket %p", sk, sk->sk_state, sk->sk_socket);
348 switch (sk->sk_state) {
350 sco_sock_cleanup_listen(sk);
355 if (sco_pi(sk)->conn->hcon) {
356 sk->sk_state = BT_DISCONN;
357 sco_sock_set_timer(sk, SCO_DISCONN_TIMEOUT);
358 hci_conn_put(sco_pi(sk)->conn->hcon);
359 sco_pi(sk)->conn->hcon = NULL;
361 sco_chan_del(sk, ECONNRESET);
366 sco_chan_del(sk, ECONNRESET);
370 sock_set_flag(sk, SOCK_ZAPPED);
375 /* Must be called on unlocked socket. */
376 static void sco_sock_close(struct sock *sk)
378 sco_sock_clear_timer(sk);
380 __sco_sock_close(sk);
385 static void sco_sock_init(struct sock *sk, struct sock *parent)
390 sk->sk_type = parent->sk_type;
391 bt_sk(sk)->flags = bt_sk(parent)->flags;
392 security_sk_clone(parent, sk);
396 static struct proto sco_proto = {
398 .owner = THIS_MODULE,
399 .obj_size = sizeof(struct sco_pinfo)
402 static struct sock *sco_sock_alloc(struct net *net, struct socket *sock, int proto, gfp_t prio)
406 sk = sk_alloc(net, PF_BLUETOOTH, prio, &sco_proto);
410 sock_init_data(sock, sk);
411 INIT_LIST_HEAD(&bt_sk(sk)->accept_q);
413 sk->sk_destruct = sco_sock_destruct;
414 sk->sk_sndtimeo = SCO_CONN_TIMEOUT;
416 sock_reset_flag(sk, SOCK_ZAPPED);
418 sk->sk_protocol = proto;
419 sk->sk_state = BT_OPEN;
421 setup_timer(&sk->sk_timer, sco_sock_timeout, (unsigned long)sk);
423 bt_sock_link(&sco_sk_list, sk);
427 static int sco_sock_create(struct net *net, struct socket *sock, int protocol,
432 BT_DBG("sock %p", sock);
434 sock->state = SS_UNCONNECTED;
436 if (sock->type != SOCK_SEQPACKET)
437 return -ESOCKTNOSUPPORT;
439 sock->ops = &sco_sock_ops;
441 sk = sco_sock_alloc(net, sock, protocol, GFP_ATOMIC);
445 sco_sock_init(sk, NULL);
449 static int sco_sock_bind(struct socket *sock, struct sockaddr *addr, int addr_len)
451 struct sockaddr_sco *sa = (struct sockaddr_sco *) addr;
452 struct sock *sk = sock->sk;
455 BT_DBG("sk %p %pMR", sk, &sa->sco_bdaddr);
457 if (!addr || addr->sa_family != AF_BLUETOOTH)
462 if (sk->sk_state != BT_OPEN) {
467 if (sk->sk_type != SOCK_SEQPACKET) {
472 bacpy(&bt_sk(sk)->src, &sa->sco_bdaddr);
474 sk->sk_state = BT_BOUND;
481 static int sco_sock_connect(struct socket *sock, struct sockaddr *addr, int alen, int flags)
483 struct sockaddr_sco *sa = (struct sockaddr_sco *) addr;
484 struct sock *sk = sock->sk;
490 if (alen < sizeof(struct sockaddr_sco) ||
491 addr->sa_family != AF_BLUETOOTH)
494 if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND)
497 if (sk->sk_type != SOCK_SEQPACKET)
502 /* Set destination address and psm */
503 bacpy(&bt_sk(sk)->dst, &sa->sco_bdaddr);
505 err = sco_connect(sk);
509 err = bt_sock_wait_state(sk, BT_CONNECTED,
510 sock_sndtimeo(sk, flags & O_NONBLOCK));
517 static int sco_sock_listen(struct socket *sock, int backlog)
519 struct sock *sk = sock->sk;
520 bdaddr_t *src = &bt_sk(sk)->src;
523 BT_DBG("sk %p backlog %d", sk, backlog);
527 if (sk->sk_state != BT_BOUND) {
532 if (sk->sk_type != SOCK_SEQPACKET) {
537 write_lock(&sco_sk_list.lock);
539 if (__sco_get_sock_listen_by_addr(src)) {
544 sk->sk_max_ack_backlog = backlog;
545 sk->sk_ack_backlog = 0;
547 sk->sk_state = BT_LISTEN;
550 write_unlock(&sco_sk_list.lock);
557 static int sco_sock_accept(struct socket *sock, struct socket *newsock, int flags)
559 DECLARE_WAITQUEUE(wait, current);
560 struct sock *sk = sock->sk, *ch;
566 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
568 BT_DBG("sk %p timeo %ld", sk, timeo);
570 /* Wait for an incoming connection. (wake-one). */
571 add_wait_queue_exclusive(sk_sleep(sk), &wait);
573 set_current_state(TASK_INTERRUPTIBLE);
575 if (sk->sk_state != BT_LISTEN) {
580 ch = bt_accept_dequeue(sk, newsock);
589 if (signal_pending(current)) {
590 err = sock_intr_errno(timeo);
595 timeo = schedule_timeout(timeo);
598 __set_current_state(TASK_RUNNING);
599 remove_wait_queue(sk_sleep(sk), &wait);
604 newsock->state = SS_CONNECTED;
606 BT_DBG("new socket %p", ch);
613 static int sco_sock_getname(struct socket *sock, struct sockaddr *addr, int *len, int peer)
615 struct sockaddr_sco *sa = (struct sockaddr_sco *) addr;
616 struct sock *sk = sock->sk;
618 BT_DBG("sock %p, sk %p", sock, sk);
620 addr->sa_family = AF_BLUETOOTH;
621 *len = sizeof(struct sockaddr_sco);
624 bacpy(&sa->sco_bdaddr, &bt_sk(sk)->dst);
626 bacpy(&sa->sco_bdaddr, &bt_sk(sk)->src);
631 static int sco_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
632 struct msghdr *msg, size_t len)
634 struct sock *sk = sock->sk;
637 BT_DBG("sock %p, sk %p", sock, sk);
639 err = sock_error(sk);
643 if (msg->msg_flags & MSG_OOB)
648 if (sk->sk_state == BT_CONNECTED)
649 err = sco_send_frame(sk, msg, len);
657 static int sco_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
658 struct msghdr *msg, size_t len, int flags)
660 struct sock *sk = sock->sk;
661 struct sco_pinfo *pi = sco_pi(sk);
665 if (sk->sk_state == BT_CONNECT2 &&
666 test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) {
667 hci_conn_accept(pi->conn->hcon, 0);
668 sk->sk_state = BT_CONFIG;
676 return bt_sock_recvmsg(iocb, sock, msg, len, flags);
679 static int sco_sock_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen)
681 struct sock *sk = sock->sk;
692 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
697 if (get_user(opt, (u32 __user *) optval)) {
703 set_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
705 clear_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
717 static int sco_sock_getsockopt_old(struct socket *sock, int optname, char __user *optval, int __user *optlen)
719 struct sock *sk = sock->sk;
720 struct sco_options opts;
721 struct sco_conninfo cinfo;
726 if (get_user(len, optlen))
733 if (sk->sk_state != BT_CONNECTED) {
738 opts.mtu = sco_pi(sk)->conn->mtu;
740 BT_DBG("mtu %d", opts.mtu);
742 len = min_t(unsigned int, len, sizeof(opts));
743 if (copy_to_user(optval, (char *)&opts, len))
749 if (sk->sk_state != BT_CONNECTED) {
754 memset(&cinfo, 0, sizeof(cinfo));
755 cinfo.hci_handle = sco_pi(sk)->conn->hcon->handle;
756 memcpy(cinfo.dev_class, sco_pi(sk)->conn->hcon->dev_class, 3);
758 len = min_t(unsigned int, len, sizeof(cinfo));
759 if (copy_to_user(optval, (char *)&cinfo, len))
773 static int sco_sock_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen)
775 struct sock *sk = sock->sk;
780 if (level == SOL_SCO)
781 return sco_sock_getsockopt_old(sock, optname, optval, optlen);
783 if (get_user(len, optlen))
791 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
796 if (put_user(test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags),
797 (u32 __user *) optval))
811 static int sco_sock_shutdown(struct socket *sock, int how)
813 struct sock *sk = sock->sk;
816 BT_DBG("sock %p, sk %p", sock, sk);
822 if (!sk->sk_shutdown) {
823 sk->sk_shutdown = SHUTDOWN_MASK;
824 sco_sock_clear_timer(sk);
825 __sco_sock_close(sk);
827 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
828 err = bt_sock_wait_state(sk, BT_CLOSED,
835 static int sco_sock_release(struct socket *sock)
837 struct sock *sk = sock->sk;
840 BT_DBG("sock %p, sk %p", sock, sk);
847 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime) {
849 err = bt_sock_wait_state(sk, BT_CLOSED, sk->sk_lingertime);
858 static void __sco_chan_add(struct sco_conn *conn, struct sock *sk, struct sock *parent)
860 BT_DBG("conn %p", conn);
862 sco_pi(sk)->conn = conn;
866 bt_accept_enqueue(parent, sk);
870 * Must be called on the locked socket. */
871 static void sco_chan_del(struct sock *sk, int err)
873 struct sco_conn *conn;
875 conn = sco_pi(sk)->conn;
877 BT_DBG("sk %p, conn %p, err %d", sk, conn, err);
882 sco_pi(sk)->conn = NULL;
883 sco_conn_unlock(conn);
886 hci_conn_put(conn->hcon);
889 sk->sk_state = BT_CLOSED;
891 sk->sk_state_change(sk);
893 sock_set_flag(sk, SOCK_ZAPPED);
896 static void sco_conn_ready(struct sco_conn *conn)
899 struct sock *sk = conn->sk;
901 BT_DBG("conn %p", conn);
906 sco_sock_clear_timer(sk);
908 sk->sk_state = BT_CONNECTED;
909 sk->sk_state_change(sk);
912 parent = sco_get_sock_listen(conn->src);
916 bh_lock_sock(parent);
918 sk = sco_sock_alloc(sock_net(parent), NULL,
919 BTPROTO_SCO, GFP_ATOMIC);
921 bh_unlock_sock(parent);
925 sco_sock_init(sk, parent);
927 bacpy(&bt_sk(sk)->src, conn->src);
928 bacpy(&bt_sk(sk)->dst, conn->dst);
930 hci_conn_hold(conn->hcon);
931 __sco_chan_add(conn, sk, parent);
933 if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(parent)->flags))
934 sk->sk_state = BT_CONNECT2;
936 sk->sk_state = BT_CONNECTED;
939 parent->sk_data_ready(parent, 1);
941 bh_unlock_sock(parent);
945 sco_conn_unlock(conn);
948 /* ----- SCO interface with lower layer (HCI) ----- */
949 int sco_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, __u8 *flags)
952 struct hlist_node *node;
955 BT_DBG("hdev %s, bdaddr %pMR", hdev->name, bdaddr);
957 /* Find listening sockets */
958 read_lock(&sco_sk_list.lock);
959 sk_for_each(sk, node, &sco_sk_list.head) {
960 if (sk->sk_state != BT_LISTEN)
963 if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr) ||
964 !bacmp(&bt_sk(sk)->src, BDADDR_ANY)) {
967 if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags))
968 *flags |= HCI_PROTO_DEFER;
972 read_unlock(&sco_sk_list.lock);
977 void sco_connect_cfm(struct hci_conn *hcon, __u8 status)
979 BT_DBG("hcon %p bdaddr %pMR status %d", hcon, &hcon->dst, status);
981 struct sco_conn *conn;
983 conn = sco_conn_add(hcon);
985 sco_conn_ready(conn);
987 sco_conn_del(hcon, bt_to_errno(status));
990 void sco_disconn_cfm(struct hci_conn *hcon, __u8 reason)
992 BT_DBG("hcon %p reason %d", hcon, reason);
994 sco_conn_del(hcon, bt_to_errno(reason));
997 int sco_recv_scodata(struct hci_conn *hcon, struct sk_buff *skb)
999 struct sco_conn *conn = hcon->sco_data;
1004 BT_DBG("conn %p len %d", conn, skb->len);
1007 sco_recv_frame(conn, skb);
1016 static int sco_debugfs_show(struct seq_file *f, void *p)
1019 struct hlist_node *node;
1021 read_lock(&sco_sk_list.lock);
1023 sk_for_each(sk, node, &sco_sk_list.head) {
1024 seq_printf(f, "%pMR %pMR %d\n", &bt_sk(sk)->src,
1025 &bt_sk(sk)->dst, sk->sk_state);
1028 read_unlock(&sco_sk_list.lock);
1033 static int sco_debugfs_open(struct inode *inode, struct file *file)
1035 return single_open(file, sco_debugfs_show, inode->i_private);
1038 static const struct file_operations sco_debugfs_fops = {
1039 .open = sco_debugfs_open,
1041 .llseek = seq_lseek,
1042 .release = single_release,
1045 static struct dentry *sco_debugfs;
1047 static const struct proto_ops sco_sock_ops = {
1048 .family = PF_BLUETOOTH,
1049 .owner = THIS_MODULE,
1050 .release = sco_sock_release,
1051 .bind = sco_sock_bind,
1052 .connect = sco_sock_connect,
1053 .listen = sco_sock_listen,
1054 .accept = sco_sock_accept,
1055 .getname = sco_sock_getname,
1056 .sendmsg = sco_sock_sendmsg,
1057 .recvmsg = sco_sock_recvmsg,
1058 .poll = bt_sock_poll,
1059 .ioctl = bt_sock_ioctl,
1060 .mmap = sock_no_mmap,
1061 .socketpair = sock_no_socketpair,
1062 .shutdown = sco_sock_shutdown,
1063 .setsockopt = sco_sock_setsockopt,
1064 .getsockopt = sco_sock_getsockopt
1067 static const struct net_proto_family sco_sock_family_ops = {
1068 .family = PF_BLUETOOTH,
1069 .owner = THIS_MODULE,
1070 .create = sco_sock_create,
1073 int __init sco_init(void)
1077 err = proto_register(&sco_proto, 0);
1081 err = bt_sock_register(BTPROTO_SCO, &sco_sock_family_ops);
1083 BT_ERR("SCO socket registration failed");
1087 err = bt_procfs_init(THIS_MODULE, &init_net, "sco", &sco_sk_list, NULL);
1089 BT_ERR("Failed to create SCO proc file");
1090 bt_sock_unregister(BTPROTO_SCO);
1095 sco_debugfs = debugfs_create_file("sco", 0444, bt_debugfs,
1096 NULL, &sco_debugfs_fops);
1098 BT_ERR("Failed to create SCO debug file");
1101 BT_INFO("SCO socket layer initialized");
1106 proto_unregister(&sco_proto);
1110 void __exit sco_exit(void)
1112 bt_procfs_cleanup(&init_net, "sco");
1114 debugfs_remove(sco_debugfs);
1116 if (bt_sock_unregister(BTPROTO_SCO) < 0)
1117 BT_ERR("SCO socket unregistration failed");
1119 proto_unregister(&sco_proto);
1122 module_param(disable_esco, bool, 0644);
1123 MODULE_PARM_DESC(disable_esco, "Disable eSCO connection creation");