2 Copyright (c) 2010,2011 Code Aurora Forum. All rights reserved.
3 Copyright (c) 2011,2012 Intel Corp.
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License version 2 and
7 only version 2 as published by the Free Software Foundation.
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.
15 #include <net/bluetooth/bluetooth.h>
16 #include <net/bluetooth/hci_core.h>
17 #include <net/bluetooth/l2cap.h>
18 #include <net/bluetooth/a2mp.h>
19 #include <net/bluetooth/amp.h>
21 /* Global AMP Manager list */
22 LIST_HEAD(amp_mgr_list);
23 DEFINE_MUTEX(amp_mgr_list_lock);
25 /* A2MP build & send command helper functions */
26 static struct a2mp_cmd *__a2mp_build(u8 code, u8 ident, u16 len, void *data)
31 plen = sizeof(*cmd) + len;
32 cmd = kzalloc(plen, GFP_KERNEL);
38 cmd->len = cpu_to_le16(len);
40 memcpy(cmd->data, data, len);
45 void a2mp_send(struct amp_mgr *mgr, u8 code, u8 ident, u16 len, void *data)
47 struct l2cap_chan *chan = mgr->a2mp_chan;
49 u16 total_len = len + sizeof(*cmd);
53 cmd = __a2mp_build(code, ident, len, data);
58 iv.iov_len = total_len;
60 memset(&msg, 0, sizeof(msg));
62 msg.msg_iov = (struct iovec *) &iv;
65 l2cap_chan_send(chan, &msg, total_len, 0);
70 u8 __next_ident(struct amp_mgr *mgr)
72 if (++mgr->ident == 0)
78 static inline void __a2mp_cl_bredr(struct a2mp_cl *cl)
85 /* hci_dev_list shall be locked */
86 static void __a2mp_add_cl(struct amp_mgr *mgr, struct a2mp_cl *cl, u8 num_ctrl)
93 list_for_each_entry(hdev, &hci_dev_list, list) {
94 /* Iterate through AMP controllers */
95 if (hdev->id == HCI_BREDR_ID)
98 /* Starting from second entry */
103 cl[i].type = hdev->amp_type;
104 cl[i].status = hdev->amp_status;
108 /* Processing A2MP messages */
109 static int a2mp_command_rej(struct amp_mgr *mgr, struct sk_buff *skb,
110 struct a2mp_cmd *hdr)
112 struct a2mp_cmd_rej *rej = (void *) skb->data;
114 if (le16_to_cpu(hdr->len) < sizeof(*rej))
117 BT_DBG("ident %d reason %d", hdr->ident, le16_to_cpu(rej->reason));
119 skb_pull(skb, sizeof(*rej));
124 static int a2mp_discover_req(struct amp_mgr *mgr, struct sk_buff *skb,
125 struct a2mp_cmd *hdr)
127 struct a2mp_discov_req *req = (void *) skb->data;
128 u16 len = le16_to_cpu(hdr->len);
129 struct a2mp_discov_rsp *rsp;
133 if (len < sizeof(*req))
136 skb_pull(skb, sizeof(*req));
138 ext_feat = le16_to_cpu(req->ext_feat);
140 BT_DBG("mtu %d efm 0x%4.4x", le16_to_cpu(req->mtu), ext_feat);
142 /* check that packet is not broken for now */
143 while (ext_feat & A2MP_FEAT_EXT) {
144 if (len < sizeof(ext_feat))
147 ext_feat = get_unaligned_le16(skb->data);
148 BT_DBG("efm 0x%4.4x", ext_feat);
149 len -= sizeof(ext_feat);
150 skb_pull(skb, sizeof(ext_feat));
153 read_lock(&hci_dev_list_lock);
155 num_ctrl = __hci_num_ctrl();
156 len = num_ctrl * sizeof(struct a2mp_cl) + sizeof(*rsp);
157 rsp = kmalloc(len, GFP_ATOMIC);
159 read_unlock(&hci_dev_list_lock);
163 rsp->mtu = __constant_cpu_to_le16(L2CAP_A2MP_DEFAULT_MTU);
166 __a2mp_add_cl(mgr, rsp->cl, num_ctrl);
168 read_unlock(&hci_dev_list_lock);
170 a2mp_send(mgr, A2MP_DISCOVER_RSP, hdr->ident, len, rsp);
176 static int a2mp_discover_rsp(struct amp_mgr *mgr, struct sk_buff *skb,
177 struct a2mp_cmd *hdr)
179 struct a2mp_discov_rsp *rsp = (void *) skb->data;
180 u16 len = le16_to_cpu(hdr->len);
185 if (len < sizeof(*rsp))
189 skb_pull(skb, sizeof(*rsp));
191 ext_feat = le16_to_cpu(rsp->ext_feat);
193 BT_DBG("mtu %d efm 0x%4.4x", le16_to_cpu(rsp->mtu), ext_feat);
195 /* check that packet is not broken for now */
196 while (ext_feat & A2MP_FEAT_EXT) {
197 if (len < sizeof(ext_feat))
200 ext_feat = get_unaligned_le16(skb->data);
201 BT_DBG("efm 0x%4.4x", ext_feat);
202 len -= sizeof(ext_feat);
203 skb_pull(skb, sizeof(ext_feat));
206 cl = (void *) skb->data;
207 while (len >= sizeof(*cl)) {
208 BT_DBG("Remote AMP id %d type %d status %d", cl->id, cl->type,
211 if (cl->id != HCI_BREDR_ID && cl->type == HCI_AMP) {
212 struct a2mp_info_req req;
216 a2mp_send(mgr, A2MP_GETINFO_REQ, __next_ident(mgr),
221 cl = (void *) skb_pull(skb, sizeof(*cl));
224 /* Fall back to L2CAP init sequence */
226 struct l2cap_conn *conn = mgr->l2cap_conn;
227 struct l2cap_chan *chan;
229 mutex_lock(&conn->chan_lock);
231 list_for_each_entry(chan, &conn->chan_l, list) {
233 BT_DBG("chan %p state %s", chan,
234 state_to_string(chan->state));
236 if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP)
239 l2cap_chan_lock(chan);
241 if (chan->state == BT_CONNECT)
242 l2cap_send_conn_req(chan);
244 l2cap_chan_unlock(chan);
247 mutex_unlock(&conn->chan_lock);
253 static int a2mp_change_notify(struct amp_mgr *mgr, struct sk_buff *skb,
254 struct a2mp_cmd *hdr)
256 struct a2mp_cl *cl = (void *) skb->data;
258 while (skb->len >= sizeof(*cl)) {
259 BT_DBG("Controller id %d type %d status %d", cl->id, cl->type,
261 cl = (struct a2mp_cl *) skb_pull(skb, sizeof(*cl));
264 /* TODO send A2MP_CHANGE_RSP */
269 static int a2mp_getinfo_req(struct amp_mgr *mgr, struct sk_buff *skb,
270 struct a2mp_cmd *hdr)
272 struct a2mp_info_req *req = (void *) skb->data;
273 struct hci_dev *hdev;
275 if (le16_to_cpu(hdr->len) < sizeof(*req))
278 BT_DBG("id %d", req->id);
280 hdev = hci_dev_get(req->id);
281 if (!hdev || hdev->dev_type != HCI_AMP) {
282 struct a2mp_info_rsp rsp;
285 rsp.status = A2MP_STATUS_INVALID_CTRL_ID;
287 a2mp_send(mgr, A2MP_GETINFO_RSP, hdr->ident, sizeof(rsp),
293 mgr->state = READ_LOC_AMP_INFO;
294 hci_send_cmd(hdev, HCI_OP_READ_LOCAL_AMP_INFO, 0, NULL);
300 skb_pull(skb, sizeof(*req));
304 static int a2mp_getinfo_rsp(struct amp_mgr *mgr, struct sk_buff *skb,
305 struct a2mp_cmd *hdr)
307 struct a2mp_info_rsp *rsp = (struct a2mp_info_rsp *) skb->data;
308 struct a2mp_amp_assoc_req req;
309 struct amp_ctrl *ctrl;
311 if (le16_to_cpu(hdr->len) < sizeof(*rsp))
314 BT_DBG("id %d status 0x%2.2x", rsp->id, rsp->status);
319 ctrl = amp_ctrl_add(mgr, rsp->id);
324 a2mp_send(mgr, A2MP_GETAMPASSOC_REQ, __next_ident(mgr), sizeof(req),
327 skb_pull(skb, sizeof(*rsp));
331 static int a2mp_getampassoc_req(struct amp_mgr *mgr, struct sk_buff *skb,
332 struct a2mp_cmd *hdr)
334 struct a2mp_amp_assoc_req *req = (void *) skb->data;
335 struct hci_dev *hdev;
338 if (le16_to_cpu(hdr->len) < sizeof(*req))
341 BT_DBG("id %d", req->id);
343 /* Make sure that other request is not processed */
344 tmp = amp_mgr_lookup_by_state(READ_LOC_AMP_ASSOC);
346 hdev = hci_dev_get(req->id);
347 if (!hdev || hdev->amp_type == HCI_BREDR || tmp) {
348 struct a2mp_amp_assoc_rsp rsp;
352 rsp.status = A2MP_STATUS_COLLISION_OCCURED;
355 rsp.status = A2MP_STATUS_INVALID_CTRL_ID;
358 a2mp_send(mgr, A2MP_GETAMPASSOC_RSP, hdr->ident, sizeof(rsp),
364 amp_read_loc_assoc(hdev, mgr);
370 skb_pull(skb, sizeof(*req));
374 static int a2mp_getampassoc_rsp(struct amp_mgr *mgr, struct sk_buff *skb,
375 struct a2mp_cmd *hdr)
377 struct a2mp_amp_assoc_rsp *rsp = (void *) skb->data;
378 u16 len = le16_to_cpu(hdr->len);
379 struct hci_dev *hdev;
380 struct amp_ctrl *ctrl;
381 struct hci_conn *hcon;
384 if (len < sizeof(*rsp))
387 assoc_len = len - sizeof(*rsp);
389 BT_DBG("id %d status 0x%2.2x assoc len %zu", rsp->id, rsp->status,
395 /* Save remote ASSOC data */
396 ctrl = amp_ctrl_lookup(mgr, rsp->id);
400 assoc = kzalloc(assoc_len, GFP_KERNEL);
406 memcpy(assoc, rsp->amp_assoc, assoc_len);
408 ctrl->assoc_len = assoc_len;
409 ctrl->assoc_rem_len = assoc_len;
410 ctrl->assoc_len_so_far = 0;
415 /* Create Phys Link */
416 hdev = hci_dev_get(rsp->id);
420 hcon = phylink_add(hdev, mgr, rsp->id, true);
424 BT_DBG("Created hcon %p: loc:%d -> rem:%d", hcon, hdev->id, rsp->id);
426 mgr->bredr_chan->remote_amp_id = rsp->id;
428 amp_create_phylink(hdev, mgr, hcon);
436 static int a2mp_createphyslink_req(struct amp_mgr *mgr, struct sk_buff *skb,
437 struct a2mp_cmd *hdr)
439 struct a2mp_physlink_req *req = (void *) skb->data;
441 struct a2mp_physlink_rsp rsp;
442 struct hci_dev *hdev;
443 struct hci_conn *hcon;
444 struct amp_ctrl *ctrl;
446 if (le16_to_cpu(hdr->len) < sizeof(*req))
449 BT_DBG("local_id %d, remote_id %d", req->local_id, req->remote_id);
451 rsp.local_id = req->remote_id;
452 rsp.remote_id = req->local_id;
454 hdev = hci_dev_get(req->remote_id);
455 if (!hdev || hdev->amp_type != HCI_AMP) {
456 rsp.status = A2MP_STATUS_INVALID_CTRL_ID;
460 ctrl = amp_ctrl_lookup(mgr, rsp.remote_id);
462 ctrl = amp_ctrl_add(mgr, rsp.remote_id);
466 rsp.status = A2MP_STATUS_UNABLE_START_LINK_CREATION;
472 size_t assoc_len = le16_to_cpu(hdr->len) - sizeof(*req);
475 assoc = kzalloc(assoc_len, GFP_KERNEL);
481 memcpy(assoc, req->amp_assoc, assoc_len);
483 ctrl->assoc_len = assoc_len;
484 ctrl->assoc_rem_len = assoc_len;
485 ctrl->assoc_len_so_far = 0;
490 hcon = phylink_add(hdev, mgr, req->local_id, false);
492 amp_accept_phylink(hdev, mgr, hcon);
493 rsp.status = A2MP_STATUS_SUCCESS;
495 rsp.status = A2MP_STATUS_UNABLE_START_LINK_CREATION;
502 a2mp_send(mgr, A2MP_CREATEPHYSLINK_RSP, hdr->ident, sizeof(rsp),
505 skb_pull(skb, le16_to_cpu(hdr->len));
509 static int a2mp_discphyslink_req(struct amp_mgr *mgr, struct sk_buff *skb,
510 struct a2mp_cmd *hdr)
512 struct a2mp_physlink_req *req = (void *) skb->data;
513 struct a2mp_physlink_rsp rsp;
514 struct hci_dev *hdev;
515 struct hci_conn *hcon;
517 if (le16_to_cpu(hdr->len) < sizeof(*req))
520 BT_DBG("local_id %d remote_id %d", req->local_id, req->remote_id);
522 rsp.local_id = req->remote_id;
523 rsp.remote_id = req->local_id;
524 rsp.status = A2MP_STATUS_SUCCESS;
526 hdev = hci_dev_get(req->remote_id);
528 rsp.status = A2MP_STATUS_INVALID_CTRL_ID;
532 hcon = hci_conn_hash_lookup_ba(hdev, AMP_LINK, mgr->l2cap_conn->dst);
534 BT_ERR("No phys link exist");
535 rsp.status = A2MP_STATUS_NO_PHYSICAL_LINK_EXISTS;
539 /* TODO Disconnect Phys Link here */
545 a2mp_send(mgr, A2MP_DISCONNPHYSLINK_RSP, hdr->ident, sizeof(rsp), &rsp);
547 skb_pull(skb, sizeof(*req));
551 static inline int a2mp_cmd_rsp(struct amp_mgr *mgr, struct sk_buff *skb,
552 struct a2mp_cmd *hdr)
554 BT_DBG("ident %d code 0x%2.2x", hdr->ident, hdr->code);
556 skb_pull(skb, le16_to_cpu(hdr->len));
560 /* Handle A2MP signalling */
561 static int a2mp_chan_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb)
563 struct a2mp_cmd *hdr;
564 struct amp_mgr *mgr = chan->data;
569 while (skb->len >= sizeof(*hdr)) {
572 hdr = (void *) skb->data;
573 len = le16_to_cpu(hdr->len);
575 BT_DBG("code 0x%2.2x id %d len %u", hdr->code, hdr->ident, len);
577 skb_pull(skb, sizeof(*hdr));
579 if (len > skb->len || !hdr->ident) {
584 mgr->ident = hdr->ident;
587 case A2MP_COMMAND_REJ:
588 a2mp_command_rej(mgr, skb, hdr);
591 case A2MP_DISCOVER_REQ:
592 err = a2mp_discover_req(mgr, skb, hdr);
595 case A2MP_CHANGE_NOTIFY:
596 err = a2mp_change_notify(mgr, skb, hdr);
599 case A2MP_GETINFO_REQ:
600 err = a2mp_getinfo_req(mgr, skb, hdr);
603 case A2MP_GETAMPASSOC_REQ:
604 err = a2mp_getampassoc_req(mgr, skb, hdr);
607 case A2MP_CREATEPHYSLINK_REQ:
608 err = a2mp_createphyslink_req(mgr, skb, hdr);
611 case A2MP_DISCONNPHYSLINK_REQ:
612 err = a2mp_discphyslink_req(mgr, skb, hdr);
615 case A2MP_DISCOVER_RSP:
616 err = a2mp_discover_rsp(mgr, skb, hdr);
619 case A2MP_GETINFO_RSP:
620 err = a2mp_getinfo_rsp(mgr, skb, hdr);
623 case A2MP_GETAMPASSOC_RSP:
624 err = a2mp_getampassoc_rsp(mgr, skb, hdr);
627 case A2MP_CHANGE_RSP:
628 case A2MP_CREATEPHYSLINK_RSP:
629 case A2MP_DISCONNPHYSLINK_RSP:
630 err = a2mp_cmd_rsp(mgr, skb, hdr);
634 BT_ERR("Unknown A2MP sig cmd 0x%2.2x", hdr->code);
641 struct a2mp_cmd_rej rej;
643 rej.reason = __constant_cpu_to_le16(0);
644 hdr = (void *) skb->data;
646 BT_DBG("Send A2MP Rej: cmd 0x%2.2x err %d", hdr->code, err);
648 a2mp_send(mgr, A2MP_COMMAND_REJ, hdr->ident, sizeof(rej),
652 /* Always free skb and return success error code to prevent
653 from sending L2CAP Disconnect over A2MP channel */
661 static void a2mp_chan_close_cb(struct l2cap_chan *chan)
663 l2cap_chan_put(chan);
666 static void a2mp_chan_state_change_cb(struct l2cap_chan *chan, int state)
668 struct amp_mgr *mgr = chan->data;
673 BT_DBG("chan %p state %s", chan, state_to_string(state));
685 static struct sk_buff *a2mp_chan_alloc_skb_cb(struct l2cap_chan *chan,
686 unsigned long len, int nb)
688 return bt_skb_alloc(len, GFP_KERNEL);
691 static struct l2cap_ops a2mp_chan_ops = {
692 .name = "L2CAP A2MP channel",
693 .recv = a2mp_chan_recv_cb,
694 .close = a2mp_chan_close_cb,
695 .state_change = a2mp_chan_state_change_cb,
696 .alloc_skb = a2mp_chan_alloc_skb_cb,
698 /* Not implemented for A2MP */
699 .new_connection = l2cap_chan_no_new_connection,
700 .teardown = l2cap_chan_no_teardown,
701 .ready = l2cap_chan_no_ready,
702 .defer = l2cap_chan_no_defer,
705 static struct l2cap_chan *a2mp_chan_open(struct l2cap_conn *conn, bool locked)
707 struct l2cap_chan *chan;
710 chan = l2cap_chan_create();
714 BT_DBG("chan %p", chan);
716 chan->chan_type = L2CAP_CHAN_CONN_FIX_A2MP;
717 chan->flush_to = L2CAP_DEFAULT_FLUSH_TO;
719 chan->ops = &a2mp_chan_ops;
721 l2cap_chan_set_defaults(chan);
722 chan->remote_max_tx = chan->max_tx;
723 chan->remote_tx_win = chan->tx_win;
725 chan->retrans_timeout = L2CAP_DEFAULT_RETRANS_TO;
726 chan->monitor_timeout = L2CAP_DEFAULT_MONITOR_TO;
728 skb_queue_head_init(&chan->tx_q);
730 chan->mode = L2CAP_MODE_ERTM;
732 err = l2cap_ertm_init(chan);
734 l2cap_chan_del(chan, 0);
738 chan->conf_state = 0;
741 __l2cap_chan_add(conn, chan);
743 l2cap_chan_add(conn, chan);
745 chan->remote_mps = chan->omtu;
746 chan->mps = chan->omtu;
748 chan->state = BT_CONNECTED;
753 /* AMP Manager functions */
754 struct amp_mgr *amp_mgr_get(struct amp_mgr *mgr)
756 BT_DBG("mgr %p orig refcnt %d", mgr, atomic_read(&mgr->kref.refcount));
758 kref_get(&mgr->kref);
763 static void amp_mgr_destroy(struct kref *kref)
765 struct amp_mgr *mgr = container_of(kref, struct amp_mgr, kref);
767 BT_DBG("mgr %p", mgr);
769 mutex_lock(&_mgr_list_lock);
770 list_del(&mgr->list);
771 mutex_unlock(&_mgr_list_lock);
773 amp_ctrl_list_flush(mgr);
777 int amp_mgr_put(struct amp_mgr *mgr)
779 BT_DBG("mgr %p orig refcnt %d", mgr, atomic_read(&mgr->kref.refcount));
781 return kref_put(&mgr->kref, &_mgr_destroy);
784 static struct amp_mgr *amp_mgr_create(struct l2cap_conn *conn, bool locked)
787 struct l2cap_chan *chan;
789 mgr = kzalloc(sizeof(*mgr), GFP_KERNEL);
793 BT_DBG("conn %p mgr %p", conn, mgr);
795 mgr->l2cap_conn = conn;
797 chan = a2mp_chan_open(conn, locked);
803 mgr->a2mp_chan = chan;
806 conn->hcon->amp_mgr = mgr;
808 kref_init(&mgr->kref);
810 /* Remote AMP ctrl list initialization */
811 INIT_LIST_HEAD(&mgr->amp_ctrls);
812 mutex_init(&mgr->amp_ctrls_lock);
814 mutex_lock(&_mgr_list_lock);
815 list_add(&mgr->list, &_mgr_list);
816 mutex_unlock(&_mgr_list_lock);
821 struct l2cap_chan *a2mp_channel_create(struct l2cap_conn *conn,
826 mgr = amp_mgr_create(conn, false);
828 BT_ERR("Could not create AMP manager");
832 BT_DBG("mgr: %p chan %p", mgr, mgr->a2mp_chan);
834 return mgr->a2mp_chan;
837 struct amp_mgr *amp_mgr_lookup_by_state(u8 state)
841 mutex_lock(&_mgr_list_lock);
842 list_for_each_entry(mgr, &_mgr_list, list) {
843 if (mgr->state == state) {
845 mutex_unlock(&_mgr_list_lock);
849 mutex_unlock(&_mgr_list_lock);
854 void a2mp_send_getinfo_rsp(struct hci_dev *hdev)
857 struct a2mp_info_rsp rsp;
859 mgr = amp_mgr_lookup_by_state(READ_LOC_AMP_INFO);
863 BT_DBG("%s mgr %p", hdev->name, mgr);
866 rsp.status = A2MP_STATUS_INVALID_CTRL_ID;
868 if (hdev->amp_type != HCI_BREDR) {
870 rsp.total_bw = cpu_to_le32(hdev->amp_total_bw);
871 rsp.max_bw = cpu_to_le32(hdev->amp_max_bw);
872 rsp.min_latency = cpu_to_le32(hdev->amp_min_latency);
873 rsp.pal_cap = cpu_to_le16(hdev->amp_pal_cap);
874 rsp.assoc_size = cpu_to_le16(hdev->amp_assoc_size);
877 a2mp_send(mgr, A2MP_GETINFO_RSP, mgr->ident, sizeof(rsp), &rsp);
881 void a2mp_send_getampassoc_rsp(struct hci_dev *hdev, u8 status)
884 struct amp_assoc *loc_assoc = &hdev->loc_assoc;
885 struct a2mp_amp_assoc_rsp *rsp;
888 mgr = amp_mgr_lookup_by_state(READ_LOC_AMP_ASSOC);
892 BT_DBG("%s mgr %p", hdev->name, mgr);
894 len = sizeof(struct a2mp_amp_assoc_rsp) + loc_assoc->len;
895 rsp = kzalloc(len, GFP_KERNEL);
904 rsp->status = A2MP_STATUS_INVALID_CTRL_ID;
906 rsp->status = A2MP_STATUS_SUCCESS;
907 memcpy(rsp->amp_assoc, loc_assoc->data, loc_assoc->len);
910 a2mp_send(mgr, A2MP_GETAMPASSOC_RSP, mgr->ident, len, rsp);
915 void a2mp_send_create_phy_link_req(struct hci_dev *hdev, u8 status)
918 struct amp_assoc *loc_assoc = &hdev->loc_assoc;
919 struct a2mp_physlink_req *req;
920 struct l2cap_chan *bredr_chan;
923 mgr = amp_mgr_lookup_by_state(READ_LOC_AMP_ASSOC_FINAL);
927 len = sizeof(*req) + loc_assoc->len;
929 BT_DBG("%s mgr %p assoc_len %zu", hdev->name, mgr, len);
931 req = kzalloc(len, GFP_KERNEL);
937 bredr_chan = mgr->bredr_chan;
941 req->local_id = hdev->id;
942 req->remote_id = bredr_chan->remote_amp_id;
943 memcpy(req->amp_assoc, loc_assoc->data, loc_assoc->len);
945 a2mp_send(mgr, A2MP_CREATEPHYSLINK_REQ, __next_ident(mgr), len, req);
952 void a2mp_discover_amp(struct l2cap_chan *chan)
954 struct l2cap_conn *conn = chan->conn;
955 struct amp_mgr *mgr = conn->hcon->amp_mgr;
956 struct a2mp_discov_req req;
958 BT_DBG("chan %p conn %p mgr %p", chan, conn, mgr);
961 mgr = amp_mgr_create(conn, true);
966 mgr->bredr_chan = chan;
968 req.mtu = cpu_to_le16(L2CAP_A2MP_DEFAULT_MTU);
970 a2mp_send(mgr, A2MP_DISCOVER_REQ, 1, sizeof(req), &req);