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      1 /******************************************************************************
      2  *
      3  *  Copyright (C) 2003-2012 Broadcom Corporation
      4  *
      5  *  Licensed under the Apache License, Version 2.0 (the "License");
      6  *  you may not use this file except in compliance with the License.
      7  *  You may obtain a copy of the License at:
      8  *
      9  *  http://www.apache.org/licenses/LICENSE-2.0
     10  *
     11  *  Unless required by applicable law or agreed to in writing, software
     12  *  distributed under the License is distributed on an "AS IS" BASIS,
     13  *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     14  *  See the License for the specific language governing permissions and
     15  *  limitations under the License.
     16  *
     17  ******************************************************************************/
     18 
     19 /******************************************************************************
     20  *
     21  *  This module contains functions which operate on the AVCTP connection
     22  *  control block.
     23  *
     24  ******************************************************************************/
     25 
     26 #include <string.h>
     27 #include "bt_types.h"
     28 #include "bt_target.h"
     29 #include "avct_api.h"
     30 #include "avct_int.h"
     31 
     32 /*******************************************************************************
     33 **
     34 ** Function         avct_ccb_alloc
     35 **
     36 ** Description      Allocate a connection control block; copy parameters to ccb.
     37 **
     38 **
     39 ** Returns          pointer to the ccb, or NULL if none could be allocated.
     40 **
     41 *******************************************************************************/
     42 tAVCT_CCB *avct_ccb_alloc(tAVCT_CC *p_cc)
     43 {
     44     tAVCT_CCB   *p_ccb = &avct_cb.ccb[0];
     45     int         i;
     46 
     47     for (i = 0; i < AVCT_NUM_CONN; i++, p_ccb++)
     48     {
     49         if (!p_ccb->allocated)
     50         {
     51             p_ccb->allocated = AVCT_ALOC_LCB;
     52             memcpy(&p_ccb->cc, p_cc, sizeof(tAVCT_CC));
     53             AVCT_TRACE_DEBUG("avct_ccb_alloc %d", i);
     54             break;
     55         }
     56     }
     57 
     58     if (i == AVCT_NUM_CONN)
     59     {
     60         /* out of ccbs */
     61         p_ccb = NULL;
     62         AVCT_TRACE_WARNING("Out of ccbs");
     63     }
     64     return p_ccb;
     65 }
     66 
     67 /*******************************************************************************
     68 **
     69 ** Function         avct_ccb_dealloc
     70 **
     71 ** Description      Deallocate a connection control block and call application
     72 **                  callback.
     73 **
     74 **
     75 ** Returns          void.
     76 **
     77 *******************************************************************************/
     78 void avct_ccb_dealloc(tAVCT_CCB *p_ccb, UINT8 event, UINT16 result, BD_ADDR bd_addr)
     79 {
     80     tAVCT_CTRL_CBACK    *p_cback = p_ccb->cc.p_ctrl_cback;
     81 
     82     AVCT_TRACE_DEBUG("avct_ccb_dealloc %d", avct_ccb_to_idx(p_ccb));
     83 #if (AVCT_BROWSE_INCLUDED == TRUE)
     84     if(p_ccb->p_bcb == NULL)
     85         memset(p_ccb, 0, sizeof(tAVCT_CCB));
     86     else
     87     {
     88         /* control channel is down, but the browsing channel is still connected 0 disconnect it now */
     89         avct_bcb_event(p_ccb->p_bcb, AVCT_LCB_UL_UNBIND_EVT, (tAVCT_LCB_EVT *) &p_ccb);
     90         p_ccb->p_lcb = NULL;
     91     }
     92 #else
     93     memset(p_ccb, 0, sizeof(tAVCT_CCB));
     94 #endif
     95 
     96     if (event != AVCT_NO_EVT)
     97     {
     98         (*p_cback)(avct_ccb_to_idx(p_ccb), event, result, bd_addr);
     99     }
    100 }
    101 
    102 /*******************************************************************************
    103 **
    104 ** Function         avct_ccb_to_idx
    105 **
    106 ** Description      Given a pointer to an ccb, return its index.
    107 **
    108 **
    109 ** Returns          Index of ccb.
    110 **
    111 *******************************************************************************/
    112 UINT8 avct_ccb_to_idx(tAVCT_CCB *p_ccb)
    113 {
    114     /* use array arithmetic to determine index */
    115     return (UINT8) (p_ccb - avct_cb.ccb);
    116 }
    117 
    118 /*******************************************************************************
    119 **
    120 ** Function         avct_ccb_by_idx
    121 **
    122 ** Description      Return ccb pointer based on ccb index (or handle).
    123 **
    124 **
    125 ** Returns          pointer to the ccb, or NULL if none found.
    126 **
    127 *******************************************************************************/
    128 tAVCT_CCB *avct_ccb_by_idx(UINT8 idx)
    129 {
    130     tAVCT_CCB   *p_ccb;
    131 
    132     /* verify index */
    133     if (idx < AVCT_NUM_CONN)
    134     {
    135         p_ccb = &avct_cb.ccb[idx];
    136 
    137         /* verify ccb is allocated */
    138         if (!p_ccb->allocated)
    139         {
    140             p_ccb = NULL;
    141             AVCT_TRACE_WARNING("ccb %d not allocated", idx);
    142         }
    143     }
    144     else
    145     {
    146         p_ccb = NULL;
    147         AVCT_TRACE_WARNING("No ccb for idx %d", idx);
    148     }
    149     return p_ccb;
    150 }
    151