stack/avdt/avdt_ccb.cc

/******************************************************************************
 *
 *  Copyright (C) 2002-2012 Broadcom Corporation
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at:
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 ******************************************************************************/

/******************************************************************************
 *
 *  This module contains the channel control block state machine and
 *  functions which operate on the channel control block.
 *
 ******************************************************************************/

#include <string.h>
#include "avdt_api.h"
#include "avdt_int.h"
#include "avdtc_api.h"
#include "bt_common.h"
#include "bt_target.h"
#include "bt_types.h"
#include "bt_utils.h"
#include "btu.h"
#include "osi/include/osi.h"

/*****************************************************************************
 * state machine constants and types
 ****************************************************************************/
#if (AVDT_DEBUG == TRUE)

/* verbose state strings for trace */
const char* const avdt_ccb_st_str[] = {"CCB_IDLE_ST", "CCB_OPENING_ST",
                                       "CCB_OPEN_ST", "CCB_CLOSING_ST"};

/* verbose event strings for trace */
const char* const avdt_ccb_evt_str[] = {
    "API_DISCOVER_REQ_EVT", "API_GETCAP_REQ_EVT",
    "API_START_REQ_EVT",    "API_SUSPEND_REQ_EVT",
    "API_DISCOVER_RSP_EVT", "API_GETCAP_RSP_EVT",
    "API_START_RSP_EVT",    "API_SUSPEND_RSP_EVT",
    "API_CONNECT_REQ_EVT",  "API_DISCONNECT_REQ_EVT",
    "MSG_DISCOVER_CMD_EVT", "MSG_GETCAP_CMD_EVT",
    "MSG_START_CMD_EVT",    "MSG_SUSPEND_CMD_EVT",
    "MSG_DISCOVER_RSP_EVT", "MSG_GETCAP_RSP_EVT",
    "MSG_START_RSP_EVT",    "MSG_SUSPEND_RSP_EVT",
    "RCVRSP_EVT",           "SENDMSG_EVT",
    "RET_TOUT_EVT",         "RSP_TOUT_EVT",
    "IDLE_TOUT_EVT",        "UL_OPEN_EVT",
    "UL_CLOSE_EVT",         "LL_OPEN_EVT",
    "LL_CLOSE_EVT",         "LL_CONG_EVT"};

#endif

/* action function list */
const tAVDT_CCB_ACTION avdt_ccb_action[] = {
    avdt_ccb_chan_open,        avdt_ccb_chan_close,
    avdt_ccb_chk_close,        avdt_ccb_hdl_discover_cmd,
    avdt_ccb_hdl_discover_rsp, avdt_ccb_hdl_getcap_cmd,
    avdt_ccb_hdl_getcap_rsp,   avdt_ccb_hdl_start_cmd,
    avdt_ccb_hdl_start_rsp,    avdt_ccb_hdl_suspend_cmd,
    avdt_ccb_hdl_suspend_rsp,  avdt_ccb_snd_discover_cmd,
    avdt_ccb_snd_discover_rsp, avdt_ccb_snd_getcap_cmd,
    avdt_ccb_snd_getcap_rsp,   avdt_ccb_snd_start_cmd,
    avdt_ccb_snd_start_rsp,    avdt_ccb_snd_suspend_cmd,
    avdt_ccb_snd_suspend_rsp,  avdt_ccb_clear_cmds,
    avdt_ccb_cmd_fail,         avdt_ccb_free_cmd,
    avdt_ccb_cong_state,       avdt_ccb_ret_cmd,
    avdt_ccb_snd_cmd,          avdt_ccb_snd_msg,
    avdt_ccb_set_reconn,       avdt_ccb_clr_reconn,
    avdt_ccb_chk_reconn,       avdt_ccb_chk_timer,
    avdt_ccb_set_conn,         avdt_ccb_set_disconn,
    avdt_ccb_do_disconn,       avdt_ccb_ll_closed,
    avdt_ccb_ll_opened,        avdt_ccb_dealloc};

/* state table information */
#define AVDT_CCB_ACTIONS 2    /* number of actions */
#define AVDT_CCB_NEXT_STATE 2 /* position of next state */
#define AVDT_CCB_NUM_COLS 3   /* number of columns in state tables */

/* state table for idle state */
const uint8_t avdt_ccb_st_idle[][AVDT_CCB_NUM_COLS] = {
    /* Event */
    /* Action 1                    Action 2                    Next state */
    /* API_DISCOVER_REQ_EVT */
    {AVDT_CCB_SND_DISCOVER_CMD, AVDT_CCB_CHAN_OPEN, AVDT_CCB_OPENING_ST},
    /* API_GETCAP_REQ_EVT */
    {AVDT_CCB_SND_GETCAP_CMD, AVDT_CCB_CHAN_OPEN, AVDT_CCB_OPENING_ST},
    /* API_START_REQ_EVT */
    {AVDT_CCB_IGNORE, AVDT_CCB_IGNORE, AVDT_CCB_IDLE_ST},
    /* API_SUSPEND_REQ_EVT */
    {AVDT_CCB_IGNORE, AVDT_CCB_IGNORE, AVDT_CCB_IDLE_ST},
    /* API_DISCOVER_RSP_EVT */
    {AVDT_CCB_IGNORE, AVDT_CCB_IGNORE, AVDT_CCB_IDLE_ST},
    /* API_GETCAP_RSP_EVT */
    {AVDT_CCB_IGNORE, AVDT_CCB_IGNORE, AVDT_CCB_IDLE_ST},
    /* API_START_RSP_EVT */
    {AVDT_CCB_IGNORE, AVDT_CCB_IGNORE, AVDT_CCB_IDLE_ST},
    /* API_SUSPEND_RSP_EVT */
    {AVDT_CCB_IGNORE, AVDT_CCB_IGNORE, AVDT_CCB_IDLE_ST},
    /* API_CONNECT_REQ_EVT */
    {AVDT_CCB_SET_CONN, AVDT_CCB_CHAN_OPEN, AVDT_CCB_OPENING_ST},
    /* API_DISCONNECT_REQ_EVT */
    {AVDT_CCB_IGNORE, AVDT_CCB_IGNORE, AVDT_CCB_IDLE_ST},
    /* MSG_DISCOVER_CMD_EVT */
    {AVDT_CCB_IGNORE, AVDT_CCB_IGNORE, AVDT_CCB_IDLE_ST},
    /* MSG_GETCAP_CMD_EVT */
    {AVDT_CCB_IGNORE, AVDT_CCB_IGNORE, AVDT_CCB_IDLE_ST},
    /* MSG_START_CMD_EVT */
    {AVDT_CCB_IGNORE, AVDT_CCB_IGNORE, AVDT_CCB_IDLE_ST},
    /* MSG_SUSPEND_CMD_EVT */
    {AVDT_CCB_IGNORE, AVDT_CCB_IGNORE, AVDT_CCB_IDLE_ST},
    /* MSG_DISCOVER_RSP_EVT */
    {AVDT_CCB_HDL_DISCOVER_RSP, AVDT_CCB_IGNORE, AVDT_CCB_IDLE_ST},
    /* MSG_GETCAP_RSP_EVT */
    {AVDT_CCB_HDL_GETCAP_RSP, AVDT_CCB_IGNORE, AVDT_CCB_IDLE_ST},
    /* MSG_START_RSP_EVT */
    {AVDT_CCB_HDL_START_RSP, AVDT_CCB_IGNORE, AVDT_CCB_IDLE_ST},
    /* MSG_SUSPEND_RSP_EVT */
    {AVDT_CCB_HDL_SUSPEND_RSP, AVDT_CCB_IGNORE, AVDT_CCB_IDLE_ST},
    /* RCVRSP_EVT */
    {AVDT_CCB_IGNORE, AVDT_CCB_IGNORE, AVDT_CCB_IDLE_ST},
    /* SENDMSG_EVT */
    {AVDT_CCB_IGNORE, AVDT_CCB_IGNORE, AVDT_CCB_IDLE_ST},
    /* RET_TOUT_EVT */
    {AVDT_CCB_IGNORE, AVDT_CCB_IGNORE, AVDT_CCB_IDLE_ST},
    /* RSP_TOUT_EVT */
    {AVDT_CCB_IGNORE, AVDT_CCB_IGNORE, AVDT_CCB_IDLE_ST},
    /* IDLE_TOUT_EVT */
    {AVDT_CCB_IGNORE, AVDT_CCB_IGNORE, AVDT_CCB_IDLE_ST},
    /* UL_OPEN_EVT */
    {AVDT_CCB_CHAN_OPEN, AVDT_CCB_IGNORE, AVDT_CCB_OPENING_ST},
    /* UL_CLOSE_EVT */
    {AVDT_CCB_IGNORE, AVDT_CCB_IGNORE, AVDT_CCB_IDLE_ST},
    /* LL_OPEN_EVT */
    {AVDT_CCB_LL_OPENED, AVDT_CCB_IGNORE, AVDT_CCB_OPEN_ST},
    /* LL_CLOSE_EVT */
    {AVDT_CCB_LL_CLOSED, AVDT_CCB_IGNORE, AVDT_CCB_IDLE_ST},
    /* LL_CONG_EVT */
    {AVDT_CCB_IGNORE, AVDT_CCB_IGNORE, AVDT_CCB_IDLE_ST}};

/* state table for opening state */
const uint8_t avdt_ccb_st_opening[][AVDT_CCB_NUM_COLS] = {
    /* Event */
    /* Action 1                    Action 2                    Next state */
    /* API_DISCOVER_REQ_EVT */
    {AVDT_CCB_SND_DISCOVER_CMD, AVDT_CCB_IGNORE, AVDT_CCB_OPENING_ST},
    /* API_GETCAP_REQ_EVT */
    {AVDT_CCB_SND_GETCAP_CMD, AVDT_CCB_IGNORE, AVDT_CCB_OPENING_ST},
    /* API_START_REQ_EVT */
    {AVDT_CCB_IGNORE, AVDT_CCB_IGNORE, AVDT_CCB_OPENING_ST},
    /* API_SUSPEND_REQ_EVT */
    {AVDT_CCB_IGNORE, AVDT_CCB_IGNORE, AVDT_CCB_OPENING_ST},
    /* API_DISCOVER_RSP_EVT */
    {AVDT_CCB_IGNORE, AVDT_CCB_IGNORE, AVDT_CCB_OPENING_ST},
    /* API_GETCAP_RSP_EVT */
    {AVDT_CCB_IGNORE, AVDT_CCB_IGNORE, AVDT_CCB_OPENING_ST},
    /* API_START_RSP_EVT */
    {AVDT_CCB_IGNORE, AVDT_CCB_IGNORE, AVDT_CCB_OPENING_ST},
    /* API_SUSPEND_RSP_EVT */
    {AVDT_CCB_IGNORE, AVDT_CCB_IGNORE, AVDT_CCB_OPENING_ST},
    /* API_CONNECT_REQ_EVT */
    {AVDT_CCB_SET_CONN, AVDT_CCB_IGNORE, AVDT_CCB_OPENING_ST},
    /* API_DISCONNECT_REQ_EVT */
    {AVDT_CCB_SET_DISCONN, AVDT_CCB_DO_DISCONN, AVDT_CCB_CLOSING_ST},
    /* MSG_DISCOVER_CMD_EVT */
    {AVDT_CCB_IGNORE, AVDT_CCB_IGNORE, AVDT_CCB_OPENING_ST},
    /* MSG_GETCAP_CMD_EVT */
    {AVDT_CCB_IGNORE, AVDT_CCB_IGNORE, AVDT_CCB_OPENING_ST},
    /* MSG_START_CMD_EVT */
    {AVDT_CCB_IGNORE, AVDT_CCB_IGNORE, AVDT_CCB_OPENING_ST},
    /* MSG_SUSPEND_CMD_EVT */
    {AVDT_CCB_IGNORE, AVDT_CCB_IGNORE, AVDT_CCB_OPENING_ST},
    /* MSG_DISCOVER_RSP_EVT */
    {AVDT_CCB_IGNORE, AVDT_CCB_IGNORE, AVDT_CCB_OPENING_ST},
    /* MSG_GETCAP_RSP_EVT */
    {AVDT_CCB_IGNORE, AVDT_CCB_IGNORE, AVDT_CCB_OPENING_ST},
    /* MSG_START_RSP_EVT */
    {AVDT_CCB_IGNORE, AVDT_CCB_IGNORE, AVDT_CCB_OPENING_ST},
    /* MSG_SUSPEND_RSP_EVT */
    {AVDT_CCB_IGNORE, AVDT_CCB_IGNORE, AVDT_CCB_OPENING_ST},
    /* RCVRSP_EVT */
    {AVDT_CCB_IGNORE, AVDT_CCB_IGNORE, AVDT_CCB_OPENING_ST},
    /* SENDMSG_EVT */
    {AVDT_CCB_IGNORE, AVDT_CCB_IGNORE, AVDT_CCB_OPENING_ST},
    /* RET_TOUT_EVT */
    {AVDT_CCB_IGNORE, AVDT_CCB_IGNORE, AVDT_CCB_OPENING_ST},
    /* RSP_TOUT_EVT */
    {AVDT_CCB_IGNORE, AVDT_CCB_IGNORE, AVDT_CCB_OPENING_ST},
    /* IDLE_TOUT_EVT */
    {AVDT_CCB_IGNORE, AVDT_CCB_IGNORE, AVDT_CCB_OPENING_ST},
    /* UL_OPEN_EVT */
    {AVDT_CCB_IGNORE, AVDT_CCB_IGNORE, AVDT_CCB_OPENING_ST},
    /* UL_CLOSE_EVT */
    {AVDT_CCB_CLEAR_CMDS, AVDT_CCB_CHAN_CLOSE, AVDT_CCB_CLOSING_ST},
    /* LL_OPEN_EVT */
    {AVDT_CCB_SND_CMD, AVDT_CCB_LL_OPENED, AVDT_CCB_OPEN_ST},
    /* LL_CLOSE_EVT */
    {AVDT_CCB_LL_CLOSED, AVDT_CCB_IGNORE, AVDT_CCB_IDLE_ST},
    /* LL_CONG_EVT */
    {AVDT_CCB_CONG_STATE, AVDT_CCB_IGNORE, AVDT_CCB_OPENING_ST}};

/* state table for open state */
const uint8_t avdt_ccb_st_open[][AVDT_CCB_NUM_COLS] = {
    /* Event */
    /* Action 1                    Action 2                    Next state */
    /* API_DISCOVER_REQ_EVT */
    {AVDT_CCB_SND_DISCOVER_CMD, AVDT_CCB_SND_CMD, AVDT_CCB_OPEN_ST},
    /* API_GETCAP_REQ_EVT */
    {AVDT_CCB_SND_GETCAP_CMD, AVDT_CCB_SND_CMD, AVDT_CCB_OPEN_ST},
    /* API_START_REQ_EVT */
    {AVDT_CCB_SND_START_CMD, AVDT_CCB_SND_CMD, AVDT_CCB_OPEN_ST},
    /* API_SUSPEND_REQ_EVT */
    {AVDT_CCB_SND_SUSPEND_CMD, AVDT_CCB_SND_CMD, AVDT_CCB_OPEN_ST},
    /* API_DISCOVER_RSP_EVT */
    {AVDT_CCB_SND_DISCOVER_RSP, AVDT_CCB_SND_CMD, AVDT_CCB_OPEN_ST},
    /* API_GETCAP_RSP_EVT */
    {AVDT_CCB_SND_GETCAP_RSP, AVDT_CCB_SND_CMD, AVDT_CCB_OPEN_ST},
    /* API_START_RSP_EVT */
    {AVDT_CCB_SND_START_RSP, AVDT_CCB_SND_CMD, AVDT_CCB_OPEN_ST},
    /* API_SUSPEND_RSP_EVT */
    {AVDT_CCB_SND_SUSPEND_RSP, AVDT_CCB_SND_CMD, AVDT_CCB_OPEN_ST},
    /* API_CONNECT_REQ_EVT */
    {AVDT_CCB_SET_CONN, AVDT_CCB_LL_OPENED, AVDT_CCB_OPEN_ST},
    /* API_DISCONNECT_REQ_EVT */
    {AVDT_CCB_SET_DISCONN, AVDT_CCB_DO_DISCONN, AVDT_CCB_CLOSING_ST},
    /* MSG_DISCOVER_CMD_EVT */
    {AVDT_CCB_HDL_DISCOVER_CMD, AVDT_CCB_IGNORE, AVDT_CCB_OPEN_ST},
    /* MSG_GETCAP_CMD_EVT */
    {AVDT_CCB_HDL_GETCAP_CMD, AVDT_CCB_IGNORE, AVDT_CCB_OPEN_ST},
    /* MSG_START_CMD_EVT */
    {AVDT_CCB_HDL_START_CMD, AVDT_CCB_IGNORE, AVDT_CCB_OPEN_ST},
    /* MSG_SUSPEND_CMD_EVT */
    {AVDT_CCB_HDL_SUSPEND_CMD, AVDT_CCB_IGNORE, AVDT_CCB_OPEN_ST},
    /* MSG_DISCOVER_RSP_EVT */
    {AVDT_CCB_CHK_CLOSE, AVDT_CCB_HDL_DISCOVER_RSP, AVDT_CCB_OPEN_ST},
    /* MSG_GETCAP_RSP_EVT */
    {AVDT_CCB_CHK_CLOSE, AVDT_CCB_HDL_GETCAP_RSP, AVDT_CCB_OPEN_ST},
    /* MSG_START_RSP_EVT */
    {AVDT_CCB_HDL_START_RSP, AVDT_CCB_IGNORE, AVDT_CCB_OPEN_ST},
    /* MSG_SUSPEND_RSP_EVT */
    {AVDT_CCB_HDL_SUSPEND_RSP, AVDT_CCB_IGNORE, AVDT_CCB_OPEN_ST},
    /* RCVRSP_EVT */
    {AVDT_CCB_FREE_CMD, AVDT_CCB_SND_CMD, AVDT_CCB_OPEN_ST},
    /* SENDMSG_EVT */
    {AVDT_CCB_SND_MSG, AVDT_CCB_IGNORE, AVDT_CCB_OPEN_ST},
    /* RET_TOUT_EVT */
    {AVDT_CCB_RET_CMD, AVDT_CCB_IGNORE, AVDT_CCB_OPEN_ST},
    /* RSP_TOUT_EVT */
    {AVDT_CCB_CMD_FAIL, AVDT_CCB_SND_CMD, AVDT_CCB_OPEN_ST},
    /* IDLE_TOUT_EVT */
    {AVDT_CCB_CLEAR_CMDS, AVDT_CCB_CHAN_CLOSE, AVDT_CCB_CLOSING_ST},
    /* UL_OPEN_EVT */
    {AVDT_CCB_CHK_TIMER, AVDT_CCB_IGNORE, AVDT_CCB_OPEN_ST},
    /* UL_CLOSE_EVT */
    {AVDT_CCB_CHK_CLOSE, AVDT_CCB_IGNORE, AVDT_CCB_OPEN_ST},
    /* LL_OPEN_EVT */
    {AVDT_CCB_IGNORE, AVDT_CCB_IGNORE, AVDT_CCB_OPEN_ST},
    /* LL_CLOSE_EVT */
    {AVDT_CCB_LL_CLOSED, AVDT_CCB_IGNORE, AVDT_CCB_IDLE_ST},
    /* LL_CONG_EVT */
    {AVDT_CCB_CONG_STATE, AVDT_CCB_SND_MSG, AVDT_CCB_OPEN_ST}};

/* state table for closing state */
const uint8_t avdt_ccb_st_closing[][AVDT_CCB_NUM_COLS] = {
    /* Event */
    /* Action 1                    Action 2                    Next state */
    /* API_DISCOVER_REQ_EVT */
    {AVDT_CCB_SET_RECONN, AVDT_CCB_SND_DISCOVER_CMD, AVDT_CCB_CLOSING_ST},
    /* API_GETCAP_REQ_EVT */
    {AVDT_CCB_SET_RECONN, AVDT_CCB_SND_GETCAP_CMD, AVDT_CCB_CLOSING_ST},
    /* API_START_REQ_EVT */
    {AVDT_CCB_IGNORE, AVDT_CCB_IGNORE, AVDT_CCB_CLOSING_ST},
    /* API_SUSPEND_REQ_EVT */
    {AVDT_CCB_IGNORE, AVDT_CCB_IGNORE, AVDT_CCB_CLOSING_ST},
    /* API_DISCOVER_RSP_EVT */
    {AVDT_CCB_IGNORE, AVDT_CCB_IGNORE, AVDT_CCB_CLOSING_ST},
    /* API_GETCAP_RSP_EVT */
    {AVDT_CCB_IGNORE, AVDT_CCB_IGNORE, AVDT_CCB_CLOSING_ST},
    /* API_START_RSP_EVT */
    {AVDT_CCB_IGNORE, AVDT_CCB_IGNORE, AVDT_CCB_CLOSING_ST},
    /* API_SUSPEND_RSP_EVT */
    {AVDT_CCB_IGNORE, AVDT_CCB_IGNORE, AVDT_CCB_CLOSING_ST},
    /* API_CONNECT_REQ_EVT */
    {AVDT_CCB_SET_RECONN, AVDT_CCB_SET_CONN, AVDT_CCB_CLOSING_ST},
    /* API_DISCONNECT_REQ_EVT */
    {AVDT_CCB_CLR_RECONN, AVDT_CCB_SET_DISCONN, AVDT_CCB_CLOSING_ST},
    /* MSG_DISCOVER_CMD_EVT */
    {AVDT_CCB_IGNORE, AVDT_CCB_IGNORE, AVDT_CCB_CLOSING_ST},
    /* MSG_GETCAP_CMD_EVT */
    {AVDT_CCB_IGNORE, AVDT_CCB_IGNORE, AVDT_CCB_CLOSING_ST},
    /* MSG_START_CMD_EVT */
    {AVDT_CCB_IGNORE, AVDT_CCB_IGNORE, AVDT_CCB_CLOSING_ST},
    /* MSG_SUSPEND_CMD_EVT */
    {AVDT_CCB_IGNORE, AVDT_CCB_IGNORE, AVDT_CCB_CLOSING_ST},
    /* MSG_DISCOVER_RSP_EVT */
    {AVDT_CCB_HDL_DISCOVER_RSP, AVDT_CCB_IGNORE, AVDT_CCB_CLOSING_ST},
    /* MSG_GETCAP_RSP_EVT */
    {AVDT_CCB_HDL_GETCAP_RSP, AVDT_CCB_IGNORE, AVDT_CCB_CLOSING_ST},
    /* MSG_START_RSP_EVT */
    {AVDT_CCB_HDL_START_RSP, AVDT_CCB_IGNORE, AVDT_CCB_CLOSING_ST},
    /* MSG_SUSPEND_RSP_EVT */
    {AVDT_CCB_HDL_SUSPEND_RSP, AVDT_CCB_IGNORE, AVDT_CCB_CLOSING_ST},
    /* RCVRSP_EVT */
    {AVDT_CCB_IGNORE, AVDT_CCB_IGNORE, AVDT_CCB_CLOSING_ST},
    /* SENDMSG_EVT */
    {AVDT_CCB_IGNORE, AVDT_CCB_IGNORE, AVDT_CCB_CLOSING_ST},
    /* RET_TOUT_EVT */
    {AVDT_CCB_IGNORE, AVDT_CCB_IGNORE, AVDT_CCB_CLOSING_ST},
    /* RSP_TOUT_EVT */
    {AVDT_CCB_IGNORE, AVDT_CCB_IGNORE, AVDT_CCB_CLOSING_ST},
    /* IDLE_TOUT_EVT */
    {AVDT_CCB_IGNORE, AVDT_CCB_IGNORE, AVDT_CCB_CLOSING_ST},
    /* UL_OPEN_EVT */
    {AVDT_CCB_SET_RECONN, AVDT_CCB_IGNORE, AVDT_CCB_CLOSING_ST},
    /* UL_CLOSE_EVT */
    {AVDT_CCB_CLR_RECONN, AVDT_CCB_IGNORE, AVDT_CCB_CLOSING_ST},
    /* LL_OPEN_EVT */
    {AVDT_CCB_IGNORE, AVDT_CCB_IGNORE, AVDT_CCB_CLOSING_ST},
    /* LL_CLOSE_EVT */
    {AVDT_CCB_CHK_RECONN, AVDT_CCB_IGNORE, AVDT_CCB_IDLE_ST},
    /* LL_CONG_EVT */
    {AVDT_CCB_IGNORE, AVDT_CCB_IGNORE, AVDT_CCB_CLOSING_ST}};

/* type for state table */
typedef const uint8_t (*tAVDT_CCB_ST_TBL)[AVDT_CCB_NUM_COLS];

/* state table */
const tAVDT_CCB_ST_TBL avdt_ccb_st_tbl[] = {
    avdt_ccb_st_idle, avdt_ccb_st_opening, avdt_ccb_st_open,
    avdt_ccb_st_closing};

/*******************************************************************************
 *
 * Function         avdt_ccb_init
 *
 * Description      Initialize channel control block module.
 *
 *
 * Returns          Nothing.
 *
 ******************************************************************************/
void avdt_ccb_init(void) {
  memset(&avdt_cb.ccb[0], 0, sizeof(tAVDT_CCB) * AVDT_NUM_LINKS);
  avdt_cb.p_ccb_act = (tAVDT_CCB_ACTION*)avdt_ccb_action;
}

/*******************************************************************************
 *
 * Function         avdt_ccb_event
 *
 * Description      State machine event handling function for ccb
 *
 *
 * Returns          Nothing.
 *
 ******************************************************************************/
void avdt_ccb_event(tAVDT_CCB* p_ccb, uint8_t event, tAVDT_CCB_EVT* p_data) {
  tAVDT_CCB_ST_TBL state_table;
  uint8_t action;
  int i;

#if (AVDT_DEBUG == TRUE)
  AVDT_TRACE_EVENT("%s: CCB ccb=%d event=%s state=%s", __func__,
                   avdt_ccb_to_idx(p_ccb), avdt_ccb_evt_str[event],
                   avdt_ccb_st_str[p_ccb->state]);
#endif

  /* look up the state table for the current state */
  state_table = avdt_ccb_st_tbl[p_ccb->state];

  /* set next state */
  if (p_ccb->state != state_table[event][AVDT_CCB_NEXT_STATE]) {
    p_ccb->state = state_table[event][AVDT_CCB_NEXT_STATE];
  }

  /* execute action functions */
  for (i = 0; i < AVDT_CCB_ACTIONS; i++) {
    action = state_table[event][i];
    if (action != AVDT_CCB_IGNORE) {
      (*avdt_cb.p_ccb_act[action])(p_ccb, p_data);
    } else {
      break;
    }
  }
}

/*******************************************************************************
 *
 * Function         avdt_ccb_by_bd
 *
 * Description      This lookup function finds the ccb for a BD address.
 *
 *
 * Returns          pointer to the ccb, or NULL if none found.
 *
 ******************************************************************************/
tAVDT_CCB* avdt_ccb_by_bd(const RawAddress& bd_addr) {
  tAVDT_CCB* p_ccb = &avdt_cb.ccb[0];
  int i;

  for (i = 0; i < AVDT_NUM_LINKS; i++, p_ccb++) {
    /* if allocated ccb has matching ccb */
    if (p_ccb->allocated && p_ccb->peer_addr == bd_addr) {
      break;
    }
  }

  if (i == AVDT_NUM_LINKS) {
    /* if no ccb found */
    p_ccb = NULL;

    VLOG(1) << "No ccb for addr " << bd_addr;
  }
  return p_ccb;
}

/*******************************************************************************
 *
 * Function         avdt_ccb_alloc
 *
 * Description      Allocate a channel control block.
 *
 *
 * Returns          pointer to the ccb, or NULL if none could be allocated.
 *
 ******************************************************************************/
tAVDT_CCB* avdt_ccb_alloc(const RawAddress& bd_addr) {
  tAVDT_CCB* p_ccb = &avdt_cb.ccb[0];
  int i;

  for (i = 0; i < AVDT_NUM_LINKS; i++, p_ccb++) {
    if (!p_ccb->allocated) {
      p_ccb->allocated = true;
      p_ccb->peer_addr = bd_addr;
      p_ccb->cmd_q = fixed_queue_new(SIZE_MAX);
      p_ccb->rsp_q = fixed_queue_new(SIZE_MAX);
      p_ccb->idle_ccb_timer = alarm_new("avdt_ccb.idle_ccb_timer");
      p_ccb->ret_ccb_timer = alarm_new("avdt_ccb.ret_ccb_timer");
      p_ccb->rsp_ccb_timer = alarm_new("avdt_ccb.rsp_ccb_timer");
      AVDT_TRACE_DEBUG("avdt_ccb_alloc %d", i);
      break;
    }
  }

  if (i == AVDT_NUM_LINKS) {
    /* out of ccbs */
    p_ccb = NULL;
    AVDT_TRACE_WARNING("Out of ccbs");
  }
  return p_ccb;
}

/*******************************************************************************
 *
 * Function         avdt_ccb_dealloc
 *
 * Description      Deallocate a stream control block.
 *
 *
 * Returns          void.
 *
 ******************************************************************************/
void avdt_ccb_dealloc(tAVDT_CCB* p_ccb, UNUSED_ATTR tAVDT_CCB_EVT* p_data) {
  AVDT_TRACE_DEBUG("avdt_ccb_dealloc %d", avdt_ccb_to_idx(p_ccb));
  alarm_free(p_ccb->idle_ccb_timer);
  alarm_free(p_ccb->ret_ccb_timer);
  alarm_free(p_ccb->rsp_ccb_timer);
  fixed_queue_free(p_ccb->cmd_q, NULL);
  fixed_queue_free(p_ccb->rsp_q, NULL);
  memset(p_ccb, 0, sizeof(tAVDT_CCB));
}

/*******************************************************************************
 *
 * Function         avdt_ccb_to_idx
 *
 * Description      Given a pointer to an ccb, return its index.
 *
 *
 * Returns          Index of ccb.
 *
 ******************************************************************************/
uint8_t avdt_ccb_to_idx(tAVDT_CCB* p_ccb) {
  /* use array arithmetic to determine index */
  return (uint8_t)(p_ccb - avdt_cb.ccb);
}

/*******************************************************************************
 *
 * Function         avdt_ccb_by_idx
 *
 * Description      Return ccb pointer based on ccb index.
 *
 *
 * Returns          pointer to the ccb, or NULL if none found.
 *
 ******************************************************************************/
tAVDT_CCB* avdt_ccb_by_idx(uint8_t idx) {
  tAVDT_CCB* p_ccb;

  /* verify index */
  if (idx < AVDT_NUM_LINKS) {
    p_ccb = &avdt_cb.ccb[idx];
  } else {
    p_ccb = NULL;
    AVDT_TRACE_WARNING("No ccb for idx %d", idx);
  }
  return p_ccb;
}