stack/avct/avct_ccb.cc

/******************************************************************************
 *
 *  Copyright (C) 2003-2012 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 functions which operate on the AVCTP connection
 *  control block.
 *
 ******************************************************************************/

#include <string.h>
#include "avct_api.h"
#include "avct_int.h"
#include "bt_target.h"
#include "bt_types.h"

/*******************************************************************************
 *
 * Function         avct_ccb_alloc
 *
 * Description      Allocate a connection control block; copy parameters to ccb.
 *
 *
 * Returns          pointer to the ccb, or NULL if none could be allocated.
 *
 ******************************************************************************/
tAVCT_CCB* avct_ccb_alloc(tAVCT_CC* p_cc) {
  tAVCT_CCB* p_ccb = &avct_cb.ccb[0];
  int i;

  for (i = 0; i < AVCT_NUM_CONN; i++, p_ccb++) {
    if (!p_ccb->allocated) {
      p_ccb->allocated = AVCT_ALOC_LCB;
      memcpy(&p_ccb->cc, p_cc, sizeof(tAVCT_CC));
      AVCT_TRACE_DEBUG("avct_ccb_alloc %d", i);
      break;
    }
  }

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

/*******************************************************************************
 *
 * Function         avct_ccb_dealloc
 *
 * Description      Deallocate a connection control block and call application
 *                  callback.
 *
 *
 * Returns          void.
 *
 ******************************************************************************/
void avct_ccb_dealloc(tAVCT_CCB* p_ccb, uint8_t event, uint16_t result,
                      const RawAddress* bd_addr) {
  tAVCT_CTRL_CBACK* p_cback = p_ccb->cc.p_ctrl_cback;

  AVCT_TRACE_DEBUG("avct_ccb_dealloc %d", avct_ccb_to_idx(p_ccb));

  if (p_ccb->p_bcb == NULL) {
    memset(p_ccb, 0, sizeof(tAVCT_CCB));
  } else {
    /* control channel is down, but the browsing channel is still connected 0
     * disconnect it now */
    avct_bcb_event(p_ccb->p_bcb, AVCT_LCB_UL_UNBIND_EVT,
                   (tAVCT_LCB_EVT*)&p_ccb);
    p_ccb->p_lcb = NULL;
  }

  if (event != AVCT_NO_EVT) {
    (*p_cback)(avct_ccb_to_idx(p_ccb), event, result, bd_addr);
  }
}

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

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

  /* verify index */
  if (idx < AVCT_NUM_CONN) {
    p_ccb = &avct_cb.ccb[idx];

    /* verify ccb is allocated */
    if (!p_ccb->allocated) {
      p_ccb = NULL;
      AVCT_TRACE_WARNING("ccb %d not allocated", idx);
    }
  } else {
    p_ccb = NULL;
    AVCT_TRACE_WARNING("No ccb for idx %d", idx);
  }
  return p_ccb;
}