/*
 * ng_hci_ulpi.c
 */

/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) Maksim Yevmenkin <m_evmenkin@yahoo.com>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * $Id: ng_hci_ulpi.c,v 1.7 2003/09/08 18:57:51 max Exp $
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/endian.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/queue.h>
#include <netgraph/ng_message.h>
#include <netgraph/netgraph.h>
#include <netgraph/bluetooth/include/ng_bluetooth.h>
#include <netgraph/bluetooth/include/ng_hci.h>
#include <netgraph/bluetooth/hci/ng_hci_var.h>
#include <netgraph/bluetooth/hci/ng_hci_cmds.h>
#include <netgraph/bluetooth/hci/ng_hci_evnt.h>
#include <netgraph/bluetooth/hci/ng_hci_ulpi.h>
#include <netgraph/bluetooth/hci/ng_hci_misc.h>

/******************************************************************************
 ******************************************************************************
 **                 Upper Layer Protocol Interface module
 ******************************************************************************
 ******************************************************************************/

static int ng_hci_lp_acl_con_req (ng_hci_unit_p, item_p, hook_p);
static int ng_hci_lp_sco_con_req (ng_hci_unit_p, item_p, hook_p);
static int ng_hci_lp_le_con_req (ng_hci_unit_p, item_p, hook_p, int);

/*
 * Process LP_ConnectReq event from the upper layer protocol
 */

int
ng_hci_lp_con_req(ng_hci_unit_p unit, item_p item, hook_p hook)
{
        int link_type;

        if ((unit->state & NG_HCI_UNIT_READY) != NG_HCI_UNIT_READY) {
                NG_HCI_WARN(
"%s: %s - unit is not ready, state=%#x\n",
                        __func__, NG_NODE_NAME(unit->node), unit->state);

                NG_FREE_ITEM(item);

                return (ENXIO);
        }

        if (NGI_MSG(item)->header.arglen != sizeof(ng_hci_lp_con_req_ep)) {
                NG_HCI_ALERT(
"%s: %s - invalid LP_ConnectReq message size=%d\n",
                        __func__, NG_NODE_NAME(unit->node),
                        NGI_MSG(item)->header.arglen);

                NG_FREE_ITEM(item);

                return (EMSGSIZE);
        }
        link_type = ((ng_hci_lp_con_req_ep *)(NGI_MSG(item)->data))->link_type;
        switch(link_type){
        case NG_HCI_LINK_ACL:
                return (ng_hci_lp_acl_con_req(unit, item, hook));
        case NG_HCI_LINK_SCO:
                if (hook != unit->sco ) {
                        NG_HCI_WARN(
                                "%s: %s - LP_ConnectReq for SCO connection came from wrong hook=%p\n",
                                __func__, NG_NODE_NAME(unit->node), hook);
                        
                        NG_FREE_ITEM(item);
                        
                        return (EINVAL);
                }
                
                return (ng_hci_lp_sco_con_req(unit, item, hook));
        case NG_HCI_LINK_LE_PUBLIC:
        case NG_HCI_LINK_LE_RANDOM:             
                return (ng_hci_lp_le_con_req(unit, item, hook, link_type));
        default:
                panic("%s: link_type invalid.", __func__);
        }

        return (EINVAL);
} /* ng_hci_lp_con_req */

/*
 * Request to create new ACL connection
 */

static int
ng_hci_lp_acl_con_req(ng_hci_unit_p unit, item_p item, hook_p hook)
{
        struct acl_con_req {
                ng_hci_cmd_pkt_t         hdr;
                ng_hci_create_con_cp     cp;
        } __attribute__ ((packed))      *req = NULL;
        ng_hci_lp_con_req_ep            *ep = NULL;
        ng_hci_unit_con_p                con = NULL;
        ng_hci_neighbor_t               *n = NULL;
        struct mbuf                     *m = NULL;
        int                              error = 0;

        ep = (ng_hci_lp_con_req_ep *)(NGI_MSG(item)->data);

        /*
         * Only one ACL connection can exist between each pair of units.
         * So try to find ACL connection descriptor (in any state) that
         * has requested remote BD_ADDR.
         *
         * Two cases:
         *
         * 1) We do not have connection to the remote unit. This is simple.
         *    Just create new connection descriptor and send HCI command to
         *    create new connection.
         *
         * 2) We do have connection descriptor. We need to check connection
         *    state:
         * 
         * 2.1) NG_HCI_CON_W4_LP_CON_RSP means that we are in the middle of
         *      accepting connection from the remote unit. This is a race
         *      condition. We will ignore this message.
         *
         * 2.2) NG_HCI_CON_W4_CONN_COMPLETE means that upper layer already
         *      requested connection or we just accepted it. In any case
         *      all we need to do here is set appropriate notification bit
         *      and wait.
         *      
         * 2.3) NG_HCI_CON_OPEN means connection is open. Just reply back
         *      and let upper layer know that we have connection already.
         */

        con = ng_hci_con_by_bdaddr(unit, &ep->bdaddr, NG_HCI_LINK_ACL);
        if (con != NULL) {
                switch (con->state) {
                case NG_HCI_CON_W4_LP_CON_RSP: /* XXX */
                        error = EALREADY;
                        break;

                case NG_HCI_CON_W4_CONN_COMPLETE:
                        if (hook == unit->acl)
                                con->flags |= NG_HCI_CON_NOTIFY_ACL;
                        else
                                con->flags |= NG_HCI_CON_NOTIFY_SCO;
                        break;

                case NG_HCI_CON_OPEN: {
                        struct ng_mesg          *msg = NULL;
                        ng_hci_lp_con_cfm_ep    *cfm = NULL;

                        if (hook != NULL && NG_HOOK_IS_VALID(hook)) {
                                NGI_GET_MSG(item, msg);
                                NG_FREE_MSG(msg);

                                NG_MKMESSAGE(msg, NGM_HCI_COOKIE, 
                                        NGM_HCI_LP_CON_CFM, sizeof(*cfm), 
                                        M_NOWAIT);
                                if (msg != NULL) {
                                        cfm = (ng_hci_lp_con_cfm_ep *)msg->data;
                                        cfm->status = 0;
                                        cfm->link_type = con->link_type;
                                        cfm->con_handle = con->con_handle;
                                        bcopy(&con->bdaddr, &cfm->bdaddr, 
                                                sizeof(cfm->bdaddr));

                                        /*
                                         * This will forward item back to
                                         * sender and set item to NULL
                                         */

                                        _NGI_MSG(item) = msg;
                                        NG_FWD_ITEM_HOOK(error, item, hook);
                                } else
                                        error = ENOMEM;
                        } else
                                NG_HCI_INFO(
"%s: %s - Source hook is not valid, hook=%p\n",
                                        __func__, NG_NODE_NAME(unit->node), 
                                        hook);
                        } break;

                default:
                        panic(
"%s: %s - Invalid connection state=%d\n",
                                __func__, NG_NODE_NAME(unit->node), con->state);
                        break;
                }

                goto out;
        }

        /*
         * If we got here then we need to create new ACL connection descriptor
         * and submit HCI command. First create new connection desriptor, set
         * bdaddr and notification flags.
         */

        con = ng_hci_new_con(unit, NG_HCI_LINK_ACL);
        if (con == NULL) {
                error = ENOMEM;
                goto out;
        }

        bcopy(&ep->bdaddr, &con->bdaddr, sizeof(con->bdaddr));

        /* 
         * Create HCI command 
         */

        MGETHDR(m, M_NOWAIT, MT_DATA);
        if (m == NULL) {
                ng_hci_free_con(con);
                error = ENOBUFS;
                goto out;
        }

        m->m_pkthdr.len = m->m_len = sizeof(*req);
        req = mtod(m, struct acl_con_req *);
        req->hdr.type = NG_HCI_CMD_PKT;
        req->hdr.length = sizeof(req->cp);
        req->hdr.opcode = htole16(NG_HCI_OPCODE(NG_HCI_OGF_LINK_CONTROL,
                                        NG_HCI_OCF_CREATE_CON));

        bcopy(&ep->bdaddr, &req->cp.bdaddr, sizeof(req->cp.bdaddr));

        req->cp.pkt_type = (NG_HCI_PKT_DM1|NG_HCI_PKT_DH1);
        if (unit->features[0] & NG_HCI_LMP_3SLOT)
                req->cp.pkt_type |= (NG_HCI_PKT_DM3|NG_HCI_PKT_DH3);
        if (unit->features[0] & NG_HCI_LMP_5SLOT)
                req->cp.pkt_type |= (NG_HCI_PKT_DM5|NG_HCI_PKT_DH5);

        req->cp.pkt_type &= unit->packet_mask;
        if ((req->cp.pkt_type & (NG_HCI_PKT_DM1|NG_HCI_PKT_DH1|
                                 NG_HCI_PKT_DM3|NG_HCI_PKT_DH3|
                                 NG_HCI_PKT_DM5|NG_HCI_PKT_DH5)) == 0)
                req->cp.pkt_type = (NG_HCI_PKT_DM1|NG_HCI_PKT_DH1);

        req->cp.pkt_type = htole16(req->cp.pkt_type);

        if ((unit->features[0] & NG_HCI_LMP_SWITCH) && unit->role_switch)
                req->cp.accept_role_switch = 1;
        else
                req->cp.accept_role_switch = 0;

        /*
         * We may speed up connect by specifying valid parameters. 
         * So check the neighbor cache.
         */

        n = ng_hci_get_neighbor(unit, &ep->bdaddr, NG_HCI_LINK_ACL);
        if (n == NULL) {
                req->cp.page_scan_rep_mode = 0;
                req->cp.page_scan_mode = 0;
                req->cp.clock_offset = 0;
        } else {
                req->cp.page_scan_rep_mode = n->page_scan_rep_mode;
                req->cp.page_scan_mode = n->page_scan_mode;
                req->cp.clock_offset = htole16(n->clock_offset);
        }

        /* 
         * Adust connection state 
         */

        if (hook == unit->acl)
                con->flags |= NG_HCI_CON_NOTIFY_ACL;
        else
                con->flags |= NG_HCI_CON_NOTIFY_SCO;

        con->state = NG_HCI_CON_W4_CONN_COMPLETE;
        ng_hci_con_timeout(con);

        /* 
         * Queue and send HCI command 
         */

        NG_BT_MBUFQ_ENQUEUE(&unit->cmdq, m);
        if (!(unit->state & NG_HCI_UNIT_COMMAND_PENDING))
                error = ng_hci_send_command(unit);
out:
        if (item != NULL)
                NG_FREE_ITEM(item);

        return (error);
} /* ng_hci_lp_acl_con_req */

/*
 * Request to create new SCO connection
 */

static int
ng_hci_lp_sco_con_req(ng_hci_unit_p unit, item_p item, hook_p hook)
{
        struct sco_con_req {
                ng_hci_cmd_pkt_t         hdr;
                ng_hci_add_sco_con_cp    cp;
        } __attribute__ ((packed))      *req = NULL;
        ng_hci_lp_con_req_ep            *ep = NULL;
        ng_hci_unit_con_p                acl_con = NULL, sco_con = NULL;
        struct mbuf                     *m = NULL;
        int                              error = 0;

        ep = (ng_hci_lp_con_req_ep *)(NGI_MSG(item)->data);

        /*
         * SCO connection without ACL link
         *
         * If upper layer requests SCO connection and there is no open ACL 
         * connection to the desired remote unit, we will reject the request.
         */

        LIST_FOREACH(acl_con, &unit->con_list, next)
                if (acl_con->link_type == NG_HCI_LINK_ACL &&
                    acl_con->state == NG_HCI_CON_OPEN &&
                    bcmp(&acl_con->bdaddr, &ep->bdaddr, sizeof(bdaddr_t)) == 0)
                        break;

        if (acl_con == NULL) {
                NG_HCI_INFO(
"%s: %s - No open ACL connection to bdaddr=%x:%x:%x:%x:%x:%x\n",
                        __func__, NG_NODE_NAME(unit->node),
                        ep->bdaddr.b[5], ep->bdaddr.b[4], ep->bdaddr.b[3],
                        ep->bdaddr.b[2], ep->bdaddr.b[1], ep->bdaddr.b[0]);

                error = ENOENT;
                goto out;
        }

        /*
         * Multiple SCO connections can exist between the same pair of units.
         * We assume that multiple SCO connections have to be opened one after 
         * another. 
         *
         * Try to find SCO connection descriptor that matches the following:
         *
         * 1) sco_con->link_type == NG_HCI_LINK_SCO
         * 
         * 2) sco_con->state == NG_HCI_CON_W4_LP_CON_RSP ||
         *    sco_con->state == NG_HCI_CON_W4_CONN_COMPLETE
         * 
         * 3) sco_con->bdaddr == ep->bdaddr
         *
         * Two cases:
         *
         * 1) We do not have connection descriptor. This is simple. Just 
         *    create new connection and submit Add_SCO_Connection command.
         *
         * 2) We do have connection descriptor. We need to check the state.
         *
         * 2.1) NG_HCI_CON_W4_LP_CON_RSP means we in the middle of accepting
         *      connection from the remote unit. This is a race condition and
         *      we will ignore the request.
         *
         * 2.2) NG_HCI_CON_W4_CONN_COMPLETE means upper layer already requested
         *      connection or we just accepted it.
         */

        LIST_FOREACH(sco_con, &unit->con_list, next)
                if (sco_con->link_type == NG_HCI_LINK_SCO &&
                    (sco_con->state == NG_HCI_CON_W4_LP_CON_RSP ||
                     sco_con->state == NG_HCI_CON_W4_CONN_COMPLETE) &&
                    bcmp(&sco_con->bdaddr, &ep->bdaddr, sizeof(bdaddr_t)) == 0)
                        break;

        if (sco_con != NULL) {
                switch (sco_con->state) {
                case NG_HCI_CON_W4_LP_CON_RSP: /* XXX */
                        error = EALREADY;
                        break;

                case NG_HCI_CON_W4_CONN_COMPLETE:
                        sco_con->flags |= NG_HCI_CON_NOTIFY_SCO;
                        break;

                default:
                        panic(
"%s: %s - Invalid connection state=%d\n",
                                __func__, NG_NODE_NAME(unit->node),
                                sco_con->state);
                        break;
                }

                goto out;
        }

        /*
         * If we got here then we need to create new SCO connection descriptor
         * and submit HCI command.
         */

        sco_con = ng_hci_new_con(unit, NG_HCI_LINK_SCO);
        if (sco_con == NULL) {
                error = ENOMEM;
                goto out;
        }

        bcopy(&ep->bdaddr, &sco_con->bdaddr, sizeof(sco_con->bdaddr));

        /* 
         * Create HCI command 
         */

        MGETHDR(m, M_NOWAIT, MT_DATA);
        if (m == NULL) {
                ng_hci_free_con(sco_con);
                error = ENOBUFS;
                goto out;
        }

        m->m_pkthdr.len = m->m_len = sizeof(*req);
        req = mtod(m, struct sco_con_req *);
        req->hdr.type = NG_HCI_CMD_PKT;
        req->hdr.length = sizeof(req->cp);
        req->hdr.opcode = htole16(NG_HCI_OPCODE(NG_HCI_OGF_LINK_CONTROL,
                                        NG_HCI_OCF_ADD_SCO_CON));

        req->cp.con_handle = htole16(acl_con->con_handle);

        req->cp.pkt_type = NG_HCI_PKT_HV1;
        if (unit->features[1] & NG_HCI_LMP_HV2_PKT)
                req->cp.pkt_type |= NG_HCI_PKT_HV2;
        if (unit->features[1] & NG_HCI_LMP_HV3_PKT)
                req->cp.pkt_type |= NG_HCI_PKT_HV3;

        req->cp.pkt_type &= unit->packet_mask;
        if ((req->cp.pkt_type & (NG_HCI_PKT_HV1|
                                 NG_HCI_PKT_HV2|
                                 NG_HCI_PKT_HV3)) == 0)
                req->cp.pkt_type = NG_HCI_PKT_HV1;

        req->cp.pkt_type = htole16(req->cp.pkt_type);

        /* 
         * Adust connection state
         */

        sco_con->flags |= NG_HCI_CON_NOTIFY_SCO;

        sco_con->state = NG_HCI_CON_W4_CONN_COMPLETE;
        ng_hci_con_timeout(sco_con);

        /* 
         * Queue and send HCI command
         */

        NG_BT_MBUFQ_ENQUEUE(&unit->cmdq, m);
        if (!(unit->state & NG_HCI_UNIT_COMMAND_PENDING))
                error = ng_hci_send_command(unit);
out:
        NG_FREE_ITEM(item);

        return (error);
} /* ng_hci_lp_sco_con_req */

static int
ng_hci_lp_le_con_req(ng_hci_unit_p unit, item_p item, hook_p hook, int link_type)
{
        struct acl_con_req {
                ng_hci_cmd_pkt_t         hdr;
                ng_hci_le_create_connection_cp   cp;
        } __attribute__ ((packed))      *req = NULL;
        ng_hci_lp_con_req_ep            *ep = NULL;
        ng_hci_unit_con_p                con = NULL;
        struct mbuf                     *m = NULL;
        int                              error = 0;

        ep = (ng_hci_lp_con_req_ep *)(NGI_MSG(item)->data);
        if((link_type != NG_HCI_LINK_LE_PUBLIC)&&
           (link_type != NG_HCI_LINK_LE_RANDOM)){
                printf("%s: Link type %d Cannot be here \n", __func__, 
                       link_type);
        }
        /*
         * Only one ACL connection can exist between each pair of units.
         * So try to find ACL connection descriptor (in any state) that
         * has requested remote BD_ADDR.
         *
         * Two cases:
         *
         * 1) We do not have connection to the remote unit. This is simple.
         *    Just create new connection descriptor and send HCI command to
         *    create new connection.
         *
         * 2) We do have connection descriptor. We need to check connection
         *    state:
         * 
         * 2.1) NG_HCI_CON_W4_LP_CON_RSP means that we are in the middle of
         *      accepting connection from the remote unit. This is a race
         *      condition. We will ignore this message.
         *
         * 2.2) NG_HCI_CON_W4_CONN_COMPLETE means that upper layer already
         *      requested connection or we just accepted it. In any case
         *      all we need to do here is set appropriate notification bit
         *      and wait.
         *      
         * 2.3) NG_HCI_CON_OPEN means connection is open. Just reply back
         *      and let upper layer know that we have connection already.
         */

        con = ng_hci_con_by_bdaddr(unit, &ep->bdaddr, link_type);
        if (con != NULL) {
                switch (con->state) {
                case NG_HCI_CON_W4_LP_CON_RSP: /* XXX */
                        error = EALREADY;
                        break;

                case NG_HCI_CON_W4_CONN_COMPLETE:
                        if (hook != unit->sco)
                                con->flags |= NG_HCI_CON_NOTIFY_ACL;
                        else
                                con->flags |= NG_HCI_CON_NOTIFY_SCO;
                        break;

                case NG_HCI_CON_OPEN: {
                        struct ng_mesg          *msg = NULL;
                        ng_hci_lp_con_cfm_ep    *cfm = NULL;

                        if (hook != NULL && NG_HOOK_IS_VALID(hook)) {
                                NGI_GET_MSG(item, msg);
                                NG_FREE_MSG(msg);

                                NG_MKMESSAGE(msg, NGM_HCI_COOKIE, 
                                        NGM_HCI_LP_CON_CFM, sizeof(*cfm), 
                                        M_NOWAIT);
                                if (msg != NULL) {
                                        cfm = (ng_hci_lp_con_cfm_ep *)msg->data;
                                        cfm->status = 0;
                                        cfm->link_type = con->link_type;
                                        cfm->con_handle = con->con_handle;
                                        bcopy(&con->bdaddr, &cfm->bdaddr, 
                                                sizeof(cfm->bdaddr));

                                        /*
                                         * This will forward item back to
                                         * sender and set item to NULL
                                         */

                                        _NGI_MSG(item) = msg;
                                        NG_FWD_ITEM_HOOK(error, item, hook);
                                } else
                                        error = ENOMEM;
                        } else
                                NG_HCI_INFO(
"%s: %s - Source hook is not valid, hook=%p\n",
                                        __func__, NG_NODE_NAME(unit->node), 
                                        hook);
                        } break;

                default:
                        panic(
"%s: %s - Invalid connection state=%d\n",
                                __func__, NG_NODE_NAME(unit->node), con->state);
                        break;
                }

                goto out;
        }

        /*
         * If we got here then we need to create new ACL connection descriptor
         * and submit HCI command. First create new connection desriptor, set
         * bdaddr and notification flags.
         */

        con = ng_hci_new_con(unit, link_type);
        if (con == NULL) {
                error = ENOMEM;
                goto out;
        }

        bcopy(&ep->bdaddr, &con->bdaddr, sizeof(con->bdaddr));

        /* 
         * Create HCI command 
         */

        MGETHDR(m, M_NOWAIT, MT_DATA);
        if (m == NULL) {
                ng_hci_free_con(con);
                error = ENOBUFS;
                goto out;
        }

        m->m_pkthdr.len = m->m_len = sizeof(*req);
        req = mtod(m, struct acl_con_req *);
        req->hdr.type = NG_HCI_CMD_PKT;
        req->hdr.length = sizeof(req->cp);
        req->hdr.opcode = htole16(NG_HCI_OPCODE(NG_HCI_OGF_LE,
                                        NG_HCI_OCF_LE_CREATE_CONNECTION));

        bcopy(&ep->bdaddr, &req->cp.peer_addr, sizeof(req->cp.peer_addr));
        req->cp.own_address_type = 0;
        req->cp.peer_addr_type = (link_type == NG_HCI_LINK_LE_RANDOM)? 1:0;
        req->cp.scan_interval = htole16(4);
        req->cp.scan_window = htole16(4);
        req->cp.filter_policy = 0;
        req->cp.conn_interval_min = htole16(0xf);
        req->cp.conn_interval_max = htole16(0xf);
        req->cp.conn_latency = htole16(0);
        req->cp.supervision_timeout = htole16(0xc80);
        req->cp.min_ce_length = htole16(1);
        req->cp.max_ce_length = htole16(1);
        /* 
         * Adust connection state 
         */

        if (hook != unit->sco)
                con->flags |= NG_HCI_CON_NOTIFY_ACL;
        else
                con->flags |= NG_HCI_CON_NOTIFY_SCO;

        con->state = NG_HCI_CON_W4_CONN_COMPLETE;
        ng_hci_con_timeout(con);

        /* 
         * Queue and send HCI command 
         */

        NG_BT_MBUFQ_ENQUEUE(&unit->cmdq, m);
        if (!(unit->state & NG_HCI_UNIT_COMMAND_PENDING))
                error = ng_hci_send_command(unit);
out:
        if (item != NULL)
                NG_FREE_ITEM(item);

        return (error);
} /* ng_hci_lp_acl_con_req */

/*
 * Process LP_DisconnectReq event from the upper layer protocol
 */

int
ng_hci_lp_discon_req(ng_hci_unit_p unit, item_p item, hook_p hook)
{
        struct discon_req {
                ng_hci_cmd_pkt_t         hdr;
                ng_hci_discon_cp         cp;
        } __attribute__ ((packed))      *req = NULL;
        ng_hci_lp_discon_req_ep         *ep = NULL;
        ng_hci_unit_con_p                con = NULL;
        struct mbuf                     *m = NULL;
        int                              error = 0;

        /* Check if unit is ready */
        if ((unit->state & NG_HCI_UNIT_READY) != NG_HCI_UNIT_READY) {
                NG_HCI_WARN(
"%s: %s - unit is not ready, state=%#x\n",
                        __func__, NG_NODE_NAME(unit->node), unit->state);

                error = ENXIO;
                goto out;
        }

        if (NGI_MSG(item)->header.arglen != sizeof(*ep)) {
                NG_HCI_ALERT(
"%s: %s - invalid LP_DisconnectReq message size=%d\n",
                        __func__, NG_NODE_NAME(unit->node),
                        NGI_MSG(item)->header.arglen);

                error = EMSGSIZE;
                goto out;
        }

        ep = (ng_hci_lp_discon_req_ep *)(NGI_MSG(item)->data);

        con = ng_hci_con_by_handle(unit, ep->con_handle);
        if (con == NULL) {
                NG_HCI_ERR(
"%s: %s - invalid connection handle=%d\n",
                        __func__, NG_NODE_NAME(unit->node), ep->con_handle);

                error = ENOENT;
                goto out;
        }

        if (con->state != NG_HCI_CON_OPEN) {
                NG_HCI_ERR(
"%s: %s - invalid connection state=%d, handle=%d\n",
                        __func__, NG_NODE_NAME(unit->node), con->state,
                        ep->con_handle);

                error = EINVAL;
                goto out;
        }

        /* 
         * Create HCI command
         */

        MGETHDR(m, M_NOWAIT, MT_DATA);
        if (m == NULL) {
                error = ENOBUFS;
                goto out;
        }

        m->m_pkthdr.len = m->m_len = sizeof(*req);
        req = mtod(m, struct discon_req *);
        req->hdr.type = NG_HCI_CMD_PKT;
        req->hdr.length = sizeof(req->cp);
        req->hdr.opcode = htole16(NG_HCI_OPCODE(NG_HCI_OGF_LINK_CONTROL,
                                                        NG_HCI_OCF_DISCON));

        req->cp.con_handle = htole16(ep->con_handle);
        req->cp.reason = ep->reason;

        /* 
         * Queue and send HCI command 
         */

        NG_BT_MBUFQ_ENQUEUE(&unit->cmdq, m);
        if (!(unit->state & NG_HCI_UNIT_COMMAND_PENDING))
                error = ng_hci_send_command(unit);
out:
        NG_FREE_ITEM(item);

        return (error);
} /* ng_hci_lp_discon_req */

/*
 * Send LP_ConnectCfm event to the upper layer protocol
 */

int
ng_hci_lp_con_cfm(ng_hci_unit_con_p con, int status)
{
        ng_hci_unit_p            unit = con->unit;
        struct ng_mesg          *msg = NULL;
        ng_hci_lp_con_cfm_ep    *ep = NULL;
        int                      error;

        /*
         * Check who wants to be notified. For ACL links both ACL and SCO
         * upstream hooks will be notified (if required). For SCO links
         * only SCO upstream hook will receive notification
         */

        if (con->link_type != NG_HCI_LINK_SCO && 
            con->flags & NG_HCI_CON_NOTIFY_ACL) {
                if (unit->acl != NULL && NG_HOOK_IS_VALID(unit->acl)) {
                        NG_MKMESSAGE(msg, NGM_HCI_COOKIE, NGM_HCI_LP_CON_CFM, 
                                sizeof(*ep), M_NOWAIT);
                        if (msg != NULL) {
                                ep = (ng_hci_lp_con_cfm_ep *) msg->data;
                                ep->status = status;
                                ep->link_type = con->link_type;
                                ep->con_handle = con->con_handle;
                                bcopy(&con->bdaddr, &ep->bdaddr, 
                                        sizeof(ep->bdaddr));

                                NG_SEND_MSG_HOOK(error, unit->node, msg,
                                        unit->acl, 0);
                        }
                } else
                        NG_HCI_INFO(
"%s: %s - ACL hook not valid, hook=%p\n",
                                __func__, NG_NODE_NAME(unit->node), unit->acl);

                con->flags &= ~NG_HCI_CON_NOTIFY_ACL;
        }

        if (con->flags & NG_HCI_CON_NOTIFY_SCO) {
                if (unit->sco != NULL && NG_HOOK_IS_VALID(unit->sco)) {
                        NG_MKMESSAGE(msg, NGM_HCI_COOKIE, NGM_HCI_LP_CON_CFM, 
                                sizeof(*ep), M_NOWAIT);
                        if (msg != NULL) {
                                ep = (ng_hci_lp_con_cfm_ep *) msg->data;
                                ep->status = status;
                                ep->link_type = con->link_type;
                                ep->con_handle = con->con_handle;
                                bcopy(&con->bdaddr, &ep->bdaddr, 
                                        sizeof(ep->bdaddr));

                                NG_SEND_MSG_HOOK(error, unit->node, msg,
                                        unit->sco, 0);
                        }
                } else
                        NG_HCI_INFO(
"%s: %s - SCO hook not valid, hook=%p\n",
                                __func__, NG_NODE_NAME(unit->node), unit->acl);

                con->flags &= ~NG_HCI_CON_NOTIFY_SCO;
        }

        return (0);
} /* ng_hci_lp_con_cfm */

int
ng_hci_lp_enc_change(ng_hci_unit_con_p con, int status)
{
        ng_hci_unit_p            unit = con->unit;
        struct ng_mesg          *msg = NULL;
        ng_hci_lp_enc_change_ep *ep = NULL;
        int                      error;

        if (con->link_type != NG_HCI_LINK_SCO) {
                if (unit->acl != NULL && NG_HOOK_IS_VALID(unit->acl)) {
                        NG_MKMESSAGE(msg, NGM_HCI_COOKIE, NGM_HCI_LP_ENC_CHG, 
                                sizeof(*ep), M_NOWAIT);
                        if (msg != NULL) {
                                ep = (ng_hci_lp_enc_change_ep *) msg->data;
                                ep->status = status;
                                ep->link_type = con->link_type;
                                ep->con_handle = con->con_handle;

                                NG_SEND_MSG_HOOK(error, unit->node, msg,
                                        unit->acl, 0);
                        }
                } else
                        NG_HCI_INFO(
"%s: %s - ACL hook not valid, hook=%p\n",
                                __func__, NG_NODE_NAME(unit->node), unit->acl);
        }
        return (0);
} /* ng_hci_lp_con_cfm */

/*
 * Send LP_ConnectInd event to the upper layer protocol
 */

int
ng_hci_lp_con_ind(ng_hci_unit_con_p con, u_int8_t *uclass)
{
        ng_hci_unit_p            unit = con->unit;
        struct ng_mesg          *msg = NULL;
        ng_hci_lp_con_ind_ep    *ep = NULL;
        hook_p                   hook = NULL;
        int                      error = 0;

        /*
         * Connection_Request event is generated for specific link type.
         * Use link_type to select upstream hook.
         */

        if (con->link_type != NG_HCI_LINK_SCO)
                hook = unit->acl;
        else
                hook = unit->sco;

        if (hook != NULL && NG_HOOK_IS_VALID(hook)) {
                NG_MKMESSAGE(msg, NGM_HCI_COOKIE, NGM_HCI_LP_CON_IND, 
                        sizeof(*ep), M_NOWAIT);
                if (msg == NULL)
                        return (ENOMEM);

                ep = (ng_hci_lp_con_ind_ep *)(msg->data);
                ep->link_type = con->link_type;
                bcopy(uclass, ep->uclass, sizeof(ep->uclass));
                bcopy(&con->bdaddr, &ep->bdaddr, sizeof(ep->bdaddr));

                NG_SEND_MSG_HOOK(error, unit->node, msg, hook, 0);
        } else {
                NG_HCI_WARN(
"%s: %s - Upstream hook is not connected or not valid, hook=%p\n",
                        __func__, NG_NODE_NAME(unit->node), hook);

                error = ENOTCONN;
        }

        return (error);
} /* ng_hci_lp_con_ind */

/*
 * Process LP_ConnectRsp event from the upper layer protocol
 */

int
ng_hci_lp_con_rsp(ng_hci_unit_p unit, item_p item, hook_p hook)
{
        struct con_rsp_req {
                ng_hci_cmd_pkt_t                 hdr;
                union {
                        ng_hci_accept_con_cp     acc;
                        ng_hci_reject_con_cp     rej;
                } __attribute__ ((packed))       cp;
        } __attribute__ ((packed))              *req = NULL;
        ng_hci_lp_con_rsp_ep                    *ep = NULL;
        ng_hci_unit_con_p                        con = NULL;
        struct mbuf                             *m = NULL;
        int                                      error = 0;

        /* Check if unit is ready */
        if ((unit->state & NG_HCI_UNIT_READY) != NG_HCI_UNIT_READY) {
                NG_HCI_WARN(
"%s: %s - unit is not ready, state=%#x\n",
                        __func__, NG_NODE_NAME(unit->node), unit->state);

                error = ENXIO;
                goto out;
        }

        if (NGI_MSG(item)->header.arglen != sizeof(*ep)) {
                NG_HCI_ALERT(
"%s: %s - invalid LP_ConnectRsp message size=%d\n",
                        __func__, NG_NODE_NAME(unit->node),
                        NGI_MSG(item)->header.arglen);

                error = EMSGSIZE;
                goto out;
        }

        ep = (ng_hci_lp_con_rsp_ep *)(NGI_MSG(item)->data);

        /*
         * Here we have to deal with race. Upper layers might send conflicting
         * requests. One might send Accept and other Reject. We will not try
         * to solve all the problems, so first request will always win.
         *
         * Try to find connection that matches the following:
         *
         * 1) con->link_type == ep->link_type
         *
         * 2) con->state == NG_HCI_CON_W4_LP_CON_RSP ||
         *    con->state == NG_HCI_CON_W4_CONN_COMPLETE
         *
         * 3) con->bdaddr == ep->bdaddr
         *
         * Two cases:
         *
         * 1) We do not have connection descriptor. Could be bogus request or
         *    we have rejected connection already.
         *
         * 2) We do have connection descriptor. Then we need to check state:
         *
         * 2.1) NG_HCI_CON_W4_LP_CON_RSP means upper layer has requested 
         *      connection and it is a first response from the upper layer.
         *      if "status == 0" (Accept) then we will send Accept_Connection
         *      command and change connection state to W4_CONN_COMPLETE, else
         *      send reject and delete connection.
         *
         * 2.2) NG_HCI_CON_W4_CONN_COMPLETE means that we already accepted 
         *      connection. If "status == 0" we just need to link request
         *      and wait, else ignore Reject request.
         */

        LIST_FOREACH(con, &unit->con_list, next)
                if (con->link_type == ep->link_type &&
                    (con->state == NG_HCI_CON_W4_LP_CON_RSP ||
                     con->state == NG_HCI_CON_W4_CONN_COMPLETE) &&
                    bcmp(&con->bdaddr, &ep->bdaddr, sizeof(bdaddr_t)) == 0)
                        break;

        if (con == NULL) {
                /* Reject for non-existing connection is fine */
                error = (ep->status == 0)? ENOENT : 0;
                goto out;
        }

        /* 
         * Remove connection timeout and check connection state.
         * Note: if ng_hci_con_untimeout() fails (returns non-zero value) then
         * timeout already happened and event went into node's queue.
         */

        if ((error = ng_hci_con_untimeout(con)) != 0)
                goto out;

        switch (con->state) {
        case NG_HCI_CON_W4_LP_CON_RSP:

                /* 
                 * Create HCI command 
                 */

                MGETHDR(m, M_NOWAIT, MT_DATA);
                if (m == NULL) {
                        error = ENOBUFS;
                        goto out;
                }
                
                req = mtod(m, struct con_rsp_req *);
                req->hdr.type = NG_HCI_CMD_PKT;

                if (ep->status == 0) {
                        req->hdr.length = sizeof(req->cp.acc);
                        req->hdr.opcode = htole16(NG_HCI_OPCODE(
                                                        NG_HCI_OGF_LINK_CONTROL,
                                                        NG_HCI_OCF_ACCEPT_CON));

                        bcopy(&ep->bdaddr, &req->cp.acc.bdaddr,
                                sizeof(req->cp.acc.bdaddr));

                        /*
                         * We are accepting connection, so if we support role
                         * switch and role switch was enabled then set role to
                         * NG_HCI_ROLE_MASTER and let LM perform role switch.
                         * Otherwise we remain slave. In this case LM WILL NOT
                         * perform role switch.
                         */

                        if ((unit->features[0] & NG_HCI_LMP_SWITCH) &&
                            unit->role_switch)
                                req->cp.acc.role = NG_HCI_ROLE_MASTER;
                        else
                                req->cp.acc.role = NG_HCI_ROLE_SLAVE;

                        /*
                         * Adjust connection state
                         */

                        if (hook == unit->acl)
                                con->flags |= NG_HCI_CON_NOTIFY_ACL;
                        else
                                con->flags |= NG_HCI_CON_NOTIFY_SCO;

                        con->state = NG_HCI_CON_W4_CONN_COMPLETE;
                        ng_hci_con_timeout(con);
                } else {
                        req->hdr.length = sizeof(req->cp.rej);
                        req->hdr.opcode = htole16(NG_HCI_OPCODE(
                                                        NG_HCI_OGF_LINK_CONTROL,
                                                        NG_HCI_OCF_REJECT_CON));

                        bcopy(&ep->bdaddr, &req->cp.rej.bdaddr,
                                sizeof(req->cp.rej.bdaddr));

                        req->cp.rej.reason = ep->status;

                        /*
                         * Free connection descritor
                         * Item will be deleted just before return.
                         */
                        
                        ng_hci_free_con(con);
                }

                m->m_pkthdr.len = m->m_len = sizeof(req->hdr) + req->hdr.length;

                /* Queue and send HCI command */
                NG_BT_MBUFQ_ENQUEUE(&unit->cmdq, m);
                if (!(unit->state & NG_HCI_UNIT_COMMAND_PENDING))
                        error = ng_hci_send_command(unit);
                break;

        case NG_HCI_CON_W4_CONN_COMPLETE:
                if (ep->status == 0) {
                        if (hook == unit->acl)
                                con->flags |= NG_HCI_CON_NOTIFY_ACL;
                        else
                                con->flags |= NG_HCI_CON_NOTIFY_SCO;
                } else
                        error = EPERM;
                break;

        default:
                panic(
"%s: %s - Invalid connection state=%d\n",
                        __func__, NG_NODE_NAME(unit->node), con->state);
                break;
        }
out:
        NG_FREE_ITEM(item);

        return (error);
} /* ng_hci_lp_con_rsp */

/*
 * Send LP_DisconnectInd to the upper layer protocol
 */

int
ng_hci_lp_discon_ind(ng_hci_unit_con_p con, int reason)
{
        ng_hci_unit_p            unit = con->unit;
        struct ng_mesg          *msg = NULL;
        ng_hci_lp_discon_ind_ep *ep = NULL;
        int                      error = 0;

        /*
         * Disconnect_Complete event is generated for specific connection
         * handle. For ACL connection handles both ACL and SCO upstream
         * hooks will receive notification. For SCO connection handles
         * only SCO upstream hook will receive notification.
         */

        if (con->link_type != NG_HCI_LINK_SCO) {
                if (unit->acl != NULL && NG_HOOK_IS_VALID(unit->acl)) {
                        NG_MKMESSAGE(msg, NGM_HCI_COOKIE, 
                                NGM_HCI_LP_DISCON_IND, sizeof(*ep), M_NOWAIT);
                        if (msg == NULL)
                                return (ENOMEM);

                        ep = (ng_hci_lp_discon_ind_ep *) msg->data;
                        ep->reason = reason;
                        ep->link_type = con->link_type;
                        ep->con_handle = con->con_handle;

                        NG_SEND_MSG_HOOK(error,unit->node,msg,unit->acl,0);
                } else
                        NG_HCI_INFO(
"%s: %s - ACL hook is not connected or not valid, hook=%p\n",
                                __func__, NG_NODE_NAME(unit->node), unit->acl);
        }

        if (unit->sco != NULL && NG_HOOK_IS_VALID(unit->sco)) {
                NG_MKMESSAGE(msg, NGM_HCI_COOKIE, NGM_HCI_LP_DISCON_IND, 
                        sizeof(*ep), M_NOWAIT);
                if (msg == NULL)
                        return (ENOMEM);

                ep = (ng_hci_lp_discon_ind_ep *) msg->data;
                ep->reason = reason;
                ep->link_type = con->link_type;
                ep->con_handle = con->con_handle;

                NG_SEND_MSG_HOOK(error, unit->node, msg, unit->sco, 0);
        } else
                NG_HCI_INFO(
"%s: %s - SCO hook is not connected or not valid, hook=%p\n",
                        __func__, NG_NODE_NAME(unit->node), unit->sco);

        return (0);
} /* ng_hci_lp_discon_ind */

/*
 * Process LP_QoSReq action from the upper layer protocol
 */

int
ng_hci_lp_qos_req(ng_hci_unit_p unit, item_p item, hook_p hook)
{
        struct qos_setup_req {
                ng_hci_cmd_pkt_t         hdr;
                ng_hci_qos_setup_cp      cp;
        } __attribute__ ((packed))      *req = NULL;
        ng_hci_lp_qos_req_ep            *ep = NULL;
        ng_hci_unit_con_p                con = NULL;
        struct mbuf                     *m = NULL;
        int                              error = 0;

        /* Check if unit is ready */
        if ((unit->state & NG_HCI_UNIT_READY) != NG_HCI_UNIT_READY) {
                NG_HCI_WARN(
"%s: %s - unit is not ready, state=%#x\n",
                        __func__, NG_NODE_NAME(unit->node), unit->state);

                error = ENXIO;
                goto out;
        }

        if (NGI_MSG(item)->header.arglen != sizeof(*ep)) {
                NG_HCI_ALERT(
"%s: %s - invalid LP_QoSSetupReq message size=%d\n",
                        __func__, NG_NODE_NAME(unit->node),
                        NGI_MSG(item)->header.arglen);

                error = EMSGSIZE;
                goto out;
        }

        ep = (ng_hci_lp_qos_req_ep *)(NGI_MSG(item)->data);

        con = ng_hci_con_by_handle(unit, ep->con_handle);
        if (con == NULL) {
                NG_HCI_ERR(
"%s: %s - invalid connection handle=%d\n",
                        __func__, NG_NODE_NAME(unit->node), ep->con_handle);

                error = EINVAL;
                goto out;
        }

        if (con->link_type != NG_HCI_LINK_ACL) {
                NG_HCI_ERR("%s: %s - invalid link type=%d\n",
                        __func__, NG_NODE_NAME(unit->node), con->link_type);

                error = EINVAL;
                goto out;
        }

        if (con->state != NG_HCI_CON_OPEN) {
                NG_HCI_ERR(
"%s: %s - invalid connection state=%d, handle=%d\n",
                        __func__, NG_NODE_NAME(unit->node), con->state,
                        con->con_handle);

                error = EINVAL;
                goto out;
        }

        /* 
         * Create HCI command 
         */

        MGETHDR(m, M_NOWAIT, MT_DATA);
        if (m == NULL) {
                error = ENOBUFS;
                goto out;
        }

        m->m_pkthdr.len = m->m_len = sizeof(*req);
        req = mtod(m, struct qos_setup_req *);
        req->hdr.type = NG_HCI_CMD_PKT;
        req->hdr.length = sizeof(req->cp);
        req->hdr.opcode = htole16(NG_HCI_OPCODE(NG_HCI_OGF_LINK_POLICY,
                        NG_HCI_OCF_QOS_SETUP));

        req->cp.con_handle = htole16(ep->con_handle);
        req->cp.flags = ep->flags;
        req->cp.service_type = ep->service_type;
        req->cp.token_rate = htole32(ep->token_rate);
        req->cp.peak_bandwidth = htole32(ep->peak_bandwidth);
        req->cp.latency = htole32(ep->latency);
        req->cp.delay_variation = htole32(ep->delay_variation);

        /* 
         * Adjust connection state 
         */

        if (hook == unit->acl)
                con->flags |= NG_HCI_CON_NOTIFY_ACL;
        else
                con->flags |= NG_HCI_CON_NOTIFY_SCO;

        /* 
         * Queue and send HCI command 
         */

        NG_BT_MBUFQ_ENQUEUE(&unit->cmdq, m);
        if (!(unit->state & NG_HCI_UNIT_COMMAND_PENDING))
                error = ng_hci_send_command(unit);
out:
        NG_FREE_ITEM(item);

        return (error);
} /* ng_hci_lp_qos_req */

/*
 * Send LP_QoSCfm event to the upper layer protocol
 */

int
ng_hci_lp_qos_cfm(ng_hci_unit_con_p con, int status)
{
        ng_hci_unit_p            unit = con->unit;
        struct ng_mesg          *msg = NULL;
        ng_hci_lp_qos_cfm_ep    *ep = NULL;
        int                      error;

        if (con->flags & NG_HCI_CON_NOTIFY_ACL) {
                if (unit->acl != NULL && NG_HOOK_IS_VALID(unit->acl)) {
                        NG_MKMESSAGE(msg, NGM_HCI_COOKIE, NGM_HCI_LP_QOS_CFM, 
                                sizeof(*ep), M_NOWAIT);
                        if (msg != NULL) {
                                ep = (ng_hci_lp_qos_cfm_ep *) msg->data;
                                ep->status = status;
                                ep->con_handle = con->con_handle;

                                NG_SEND_MSG_HOOK(error, unit->node, msg,
                                        unit->acl, 0);
                        }
                } else
                        NG_HCI_INFO(
"%s: %s - ACL hook not valid, hook=%p\n",
                                __func__, NG_NODE_NAME(unit->node), unit->acl);

                con->flags &= ~NG_HCI_CON_NOTIFY_ACL;
        }

        if (con->flags & NG_HCI_CON_NOTIFY_SCO) {
                if (unit->sco != NULL && NG_HOOK_IS_VALID(unit->sco)) {
                        NG_MKMESSAGE(msg, NGM_HCI_COOKIE, NGM_HCI_LP_QOS_CFM, 
                                sizeof(*ep), M_NOWAIT);
                        if (msg != NULL) {
                                ep = (ng_hci_lp_qos_cfm_ep *) msg->data;
                                ep->status = status;
                                ep->con_handle = con->con_handle;

                                NG_SEND_MSG_HOOK(error, unit->node, msg,
                                        unit->sco, 0);
                        }
                } else
                        NG_HCI_INFO(
"%s: %s - SCO hook not valid, hook=%p\n",
                                 __func__, NG_NODE_NAME(unit->node), unit->sco);

                con->flags &= ~NG_HCI_CON_NOTIFY_SCO;
        }

        return (0);
} /* ng_hci_lp_qos_cfm */

/*
 * Send LP_QoSViolationInd event to the upper layer protocol
 */

int
ng_hci_lp_qos_ind(ng_hci_unit_con_p con)
{
        ng_hci_unit_p            unit = con->unit;
        struct ng_mesg          *msg = NULL;
        ng_hci_lp_qos_ind_ep    *ep = NULL;
        int                      error;

        /* 
         * QoS Violation can only be generated for ACL connection handles.
         * Both ACL and SCO upstream hooks will receive notification.
         */

        if (unit->acl != NULL && NG_HOOK_IS_VALID(unit->acl)) {
                NG_MKMESSAGE(msg, NGM_HCI_COOKIE, NGM_HCI_LP_QOS_IND, 
                        sizeof(*ep), M_NOWAIT);
                if (msg == NULL)
                        return (ENOMEM);

                ep = (ng_hci_lp_qos_ind_ep *) msg->data;
                ep->con_handle = con->con_handle;

                NG_SEND_MSG_HOOK(error, unit->node, msg, unit->acl, 0);
        } else
                NG_HCI_INFO(
"%s: %s - ACL hook is not connected or not valid, hook=%p\n",
                        __func__, NG_NODE_NAME(unit->node), unit->acl);

        if (unit->sco != NULL && NG_HOOK_IS_VALID(unit->sco)) {
                NG_MKMESSAGE(msg, NGM_HCI_COOKIE, NGM_HCI_LP_QOS_IND, 
                        sizeof(*ep), M_NOWAIT);
                if (msg == NULL)
                        return (ENOMEM);

                ep = (ng_hci_lp_qos_ind_ep *) msg->data;
                ep->con_handle = con->con_handle;

                NG_SEND_MSG_HOOK(error, unit->node, msg, unit->sco, 0);
        } else
                NG_HCI_INFO(
"%s: %s - SCO hook is not connected or not valid, hook=%p\n",
                        __func__, NG_NODE_NAME(unit->node), unit->sco);

        return (0);
} /* ng_hci_lp_qos_ind */

/*
 * Process connection timeout
 */

void
ng_hci_process_con_timeout(node_p node, hook_p hook, void *arg1, int con_handle)
{
        ng_hci_unit_p           unit = NULL;
        ng_hci_unit_con_p       con = NULL;

        if (NG_NODE_NOT_VALID(node)) {
                printf("%s: Netgraph node is not valid\n", __func__);
                return;
        }

        unit = (ng_hci_unit_p) NG_NODE_PRIVATE(node);
        con = ng_hci_con_by_handle(unit, con_handle);

        if (con == NULL) {
                NG_HCI_ALERT(
"%s: %s - could not find connection, handle=%d\n",
                        __func__, NG_NODE_NAME(node), con_handle);
                return;
        }

        if (!(con->flags & NG_HCI_CON_TIMEOUT_PENDING)) {
                NG_HCI_ALERT(
"%s: %s - no pending connection timeout, handle=%d, state=%d, flags=%#x\n",
                        __func__, NG_NODE_NAME(node), con_handle, con->state,
                        con->flags);
                return;
        }

        con->flags &= ~NG_HCI_CON_TIMEOUT_PENDING;

        /*
         * We expect to receive connection timeout in one of the following
         * states:
         *
         * 1) NG_HCI_CON_W4_LP_CON_RSP means that upper layer has not responded
         *    to our LP_CON_IND. Do nothing and destroy connection. Remote peer
         *    most likely already gave up on us.
         * 
         * 2) NG_HCI_CON_W4_CONN_COMPLETE means upper layer requested connection
         *    (or we in the process of accepting it) and baseband has timedout
         *    on us. Inform upper layers and send LP_CON_CFM.
         */

        switch (con->state) {
        case NG_HCI_CON_W4_LP_CON_RSP:
                break;

        case NG_HCI_CON_W4_CONN_COMPLETE:
                ng_hci_lp_con_cfm(con, 0xee);
                break;

        default:
                panic(
"%s: %s - Invalid connection state=%d\n",
                        __func__, NG_NODE_NAME(node), con->state);
                break;
        }

        ng_hci_free_con(con);
} /* ng_hci_process_con_timeout */