595 lines
20 KiB
C
595 lines
20 KiB
C
/******************************************************************************
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*
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* Copyright (C) 2002-2012 Broadcom Corporation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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******************************************************************************/
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/******************************************************************************
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*
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* This module contains the AVDTP adaption layer.
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*
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******************************************************************************/
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// #include <assert.h>
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#include "bt_trace.h"
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#include <string.h>
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#include "bt_types.h"
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#include "bt_target.h"
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#include "bt_utils.h"
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#include "avdt_api.h"
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#include "avdtc_api.h"
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#include "avdt_int.h"
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#include "l2c_api.h"
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#include "l2cdefs.h"
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#if (defined(AVDT_INCLUDED) && AVDT_INCLUDED == TRUE)
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/*******************************************************************************
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**
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** Function avdt_ad_type_to_tcid
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**
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** Description Derives the TCID from the channel type and SCB.
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**
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**
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** Returns TCID value.
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**
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*******************************************************************************/
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UINT8 avdt_ad_type_to_tcid(UINT8 type, tAVDT_SCB *p_scb)
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{
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UINT8 scb_idx;
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if (type == AVDT_CHAN_SIG) {
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return 0;
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} else {
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scb_idx = avdt_scb_to_hdl(p_scb) - 1;
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/*
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AVDT_TRACE_DEBUG("type: %d, tcid: %d", type, ((scb_idx * (AVDT_CHAN_NUM_TYPES - 1)) + type));
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*/
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return ((scb_idx * (AVDT_CHAN_NUM_TYPES - 1)) + type);
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}
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}
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/*******************************************************************************
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**
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** Function avdt_ad_tcid_to_type
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**
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** Description Derives the channel type from the TCID.
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**
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**
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** Returns Channel type value.
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**
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*******************************************************************************/
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static UINT8 avdt_ad_tcid_to_type(UINT8 tcid)
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{
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UINT8 type;
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if (tcid == 0) {
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type = AVDT_CHAN_SIG;
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} else {
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/* tcid translates to type based on number of channels, as follows:
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** only media channel : tcid=1,2,3,4,5,6... type=1,1,1,1,1,1...
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** media and report : tcid=1,2,3,4,5,6... type=1,2,1,2,1,2...
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** media, report, recov : tcid=1,2,3,4,5,6... type=1,2,3,1,2,3...
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*/
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type = ((tcid + AVDT_CHAN_NUM_TYPES - 2) % (AVDT_CHAN_NUM_TYPES - 1)) + 1;
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}
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AVDT_TRACE_DEBUG("tcid: %d, type: %d\n", tcid, type);
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return type;
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}
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/*******************************************************************************
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**
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** Function avdt_ad_init
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**
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** Description Initialize adaption layer.
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**
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**
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** Returns Nothing.
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**
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*******************************************************************************/
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void avdt_ad_init(void)
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{
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int i;
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tAVDT_TC_TBL *p_tbl = avdt_cb.ad.tc_tbl;
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memset(&avdt_cb.ad, 0, sizeof(tAVDT_AD));
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/* make sure the peer_mtu is a valid value */
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for (i = 0; i < AVDT_NUM_TC_TBL; i++, p_tbl++) {
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p_tbl->peer_mtu = L2CAP_DEFAULT_MTU;
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}
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}
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/*******************************************************************************
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**
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** Function avdt_ad_tc_tbl_by_st
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**
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** Description Find adaption layer transport channel table entry matching
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** the given state.
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**
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**
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** Returns Pointer to matching entry. For control channel it returns
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** the matching entry. For media or other it returns the
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** first matching entry (there could be more than one).
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**
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*******************************************************************************/
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tAVDT_TC_TBL *avdt_ad_tc_tbl_by_st(UINT8 type, tAVDT_CCB *p_ccb, UINT8 state)
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{
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int i;
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tAVDT_TC_TBL *p_tbl = avdt_cb.ad.tc_tbl;
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UINT8 ccb_idx;
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if (p_ccb == NULL) {
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/* resending security req */
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for (i = 0; i < AVDT_NUM_TC_TBL; i++, p_tbl++) {
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/* must be AVDT_CHAN_SIG - tcid always zero */
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if ((p_tbl->tcid == 0) &&
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(p_tbl->state == state)) {
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break;
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}
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}
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} else {
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ccb_idx = avdt_ccb_to_idx(p_ccb);
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for (i = 0; i < AVDT_NUM_TC_TBL; i++, p_tbl++) {
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if (type == AVDT_CHAN_SIG) {
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/* if control channel, tcid always zero */
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if ((p_tbl->tcid == 0) &&
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(p_tbl->ccb_idx == ccb_idx) &&
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(p_tbl->state == state)) {
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break;
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}
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} else {
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/* if other channel, tcid is always > zero */
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if ((p_tbl->tcid > 0) &&
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(p_tbl->ccb_idx == ccb_idx) &&
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(p_tbl->state == state)) {
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break;
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}
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}
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}
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}
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/* if nothing found return null */
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if (i == AVDT_NUM_TC_TBL) {
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p_tbl = NULL;
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}
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return p_tbl;
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}
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/*******************************************************************************
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**
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** Function avdt_ad_tc_tbl_by_lcid
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**
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** Description Find adaption layer transport channel table entry by LCID.
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**
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**
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** Returns Pointer to entry.
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**
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*******************************************************************************/
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tAVDT_TC_TBL *avdt_ad_tc_tbl_by_lcid(UINT16 lcid)
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{
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UINT8 idx;
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idx = avdt_cb.ad.lcid_tbl[lcid - L2CAP_BASE_APPL_CID];
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if (idx < AVDT_NUM_TC_TBL) {
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return &avdt_cb.ad.tc_tbl[idx];
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} else {
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return NULL;
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}
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}
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/*******************************************************************************
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**
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** Function avdt_ad_tc_tbl_by_type
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**
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** Description This function retrieves the transport channel table entry
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** for a particular channel.
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**
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**
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** Returns Pointer to transport channel table entry.
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**
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*******************************************************************************/
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tAVDT_TC_TBL *avdt_ad_tc_tbl_by_type(UINT8 type, tAVDT_CCB *p_ccb, tAVDT_SCB *p_scb)
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{
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UINT8 tcid;
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int i;
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tAVDT_TC_TBL *p_tbl = avdt_cb.ad.tc_tbl;
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UINT8 ccb_idx = avdt_ccb_to_idx(p_ccb);
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/* get tcid from type, scb */
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tcid = avdt_ad_type_to_tcid(type, p_scb);
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for (i = 0; i < AVDT_NUM_TC_TBL; i++, p_tbl++) {
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if ((p_tbl->tcid == tcid) && (p_tbl->ccb_idx == ccb_idx)) {
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break;
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}
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}
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assert(i != AVDT_NUM_TC_TBL);
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return p_tbl;
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}
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/*******************************************************************************
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**
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** Function avdt_ad_tc_tbl_alloc
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**
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** Description Allocate an entry in the traffic channel table.
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**
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**
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** Returns Pointer to entry.
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**
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*******************************************************************************/
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tAVDT_TC_TBL *avdt_ad_tc_tbl_alloc(tAVDT_CCB *p_ccb)
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{
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int i;
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tAVDT_TC_TBL *p_tbl = avdt_cb.ad.tc_tbl;
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/* find next free entry in tc table */
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for (i = 0; i < AVDT_NUM_TC_TBL; i++, p_tbl++) {
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if (p_tbl->state == AVDT_AD_ST_UNUSED) {
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break;
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}
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}
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/* sanity check */
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assert(i != AVDT_NUM_TC_TBL);
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/* initialize entry */
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p_tbl->peer_mtu = L2CAP_DEFAULT_MTU;
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p_tbl->cfg_flags = 0;
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p_tbl->ccb_idx = avdt_ccb_to_idx(p_ccb);
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p_tbl->state = AVDT_AD_ST_IDLE;
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return p_tbl;
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}
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/*******************************************************************************
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**
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** Function avdt_ad_tc_tbl_to_idx
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**
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** Description Convert a transport channel table entry to an index.
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**
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**
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** Returns Index value.
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**
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*******************************************************************************/
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UINT8 avdt_ad_tc_tbl_to_idx(tAVDT_TC_TBL *p_tbl)
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{
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AVDT_TRACE_DEBUG("avdt_ad_tc_tbl_to_idx: %d\n", (p_tbl - avdt_cb.ad.tc_tbl));
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/* use array arithmetic to determine index */
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return (UINT8) (p_tbl - avdt_cb.ad.tc_tbl);
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}
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/*******************************************************************************
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**
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** Function avdt_ad_tc_close_ind
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**
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** Description This function is called by the L2CAP interface when the
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** L2CAP channel is closed. It looks up the CCB or SCB for
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** the channel and sends it a close event. The reason
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** parameter is the same value passed by the L2CAP
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** callback function.
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**
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**
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** Returns Nothing.
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**
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*******************************************************************************/
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void avdt_ad_tc_close_ind(tAVDT_TC_TBL *p_tbl, UINT16 reason)
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{
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tAVDT_CCB *p_ccb;
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tAVDT_SCB *p_scb;
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tAVDT_SCB_TC_CLOSE close;
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// UNUSED(reason);
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close.old_tc_state = p_tbl->state;
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/* clear avdt_ad_tc_tbl entry */
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p_tbl->state = AVDT_AD_ST_UNUSED;
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p_tbl->cfg_flags = 0;
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p_tbl->peer_mtu = L2CAP_DEFAULT_MTU;
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AVDT_TRACE_DEBUG("avdt_ad_tc_close_ind tcid: %d, old: %d\n",
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p_tbl->tcid, close.old_tc_state);
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/* if signaling channel, notify ccb that channel open */
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if (p_tbl->tcid == 0) {
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p_ccb = avdt_ccb_by_idx(p_tbl->ccb_idx);
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p_ccb->disc_rsn = (reason == AVDT_DISC_RSN_ABNORMAL) ? AVDT_DISC_RSN_ABNORMAL : AVDT_DISC_RSN_NORMAL;
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avdt_ccb_event(p_ccb, AVDT_CCB_LL_CLOSE_EVT, NULL);
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}
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/* if media or other channel, notify scb that channel close */
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else {
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/* look up scb in stream routing table by ccb, tcid */
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p_scb = avdt_scb_by_hdl(avdt_cb.ad.rt_tbl[p_tbl->ccb_idx][p_tbl->tcid].scb_hdl);
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if (p_scb != NULL) {
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close.tcid = p_tbl->tcid;
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close.type = avdt_ad_tcid_to_type(p_tbl->tcid);
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close.disc_rsn = (reason == AVDT_DISC_RSN_ABNORMAL) ? AVDT_DISC_RSN_ABNORMAL : AVDT_DISC_RSN_NORMAL;
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avdt_scb_event(p_scb, AVDT_SCB_TC_CLOSE_EVT, (tAVDT_SCB_EVT *)&close);
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}
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}
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}
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/*******************************************************************************
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**
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** Function avdt_ad_tc_open_ind
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**
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** Description This function is called by the L2CAP interface when
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** the L2CAP channel is opened. It looks up the CCB or SCB
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** for the channel and sends it an open event.
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**
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**
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** Returns Nothing.
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**
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*******************************************************************************/
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void avdt_ad_tc_open_ind(tAVDT_TC_TBL *p_tbl)
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{
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tAVDT_CCB *p_ccb;
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tAVDT_SCB *p_scb;
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tAVDT_OPEN open;
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tAVDT_EVT_HDR evt;
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p_tbl->state = AVDT_AD_ST_OPEN;
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/* if signaling channel, notify ccb that channel open */
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if (p_tbl->tcid == 0) {
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/* set the signal channel to use high priority within the ACL link */
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L2CA_SetTxPriority(avdt_cb.ad.rt_tbl[p_tbl->ccb_idx][AVDT_CHAN_SIG].lcid, L2CAP_CHNL_PRIORITY_HIGH);
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p_ccb = avdt_ccb_by_idx(p_tbl->ccb_idx);
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/* use err_param to indicate the role of connection.
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* AVDT_ACP, if ACP */
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evt.err_param = AVDT_INT;
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if (p_tbl->cfg_flags & AVDT_L2C_CFG_CONN_ACP) {
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evt.err_param = AVDT_ACP;
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}
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avdt_ccb_event(p_ccb, AVDT_CCB_LL_OPEN_EVT, (tAVDT_CCB_EVT *)&evt);
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}
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/* if media or other channel, notify scb that channel open */
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else {
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/* look up scb in stream routing table by ccb, tcid */
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p_scb = avdt_scb_by_hdl(avdt_cb.ad.rt_tbl[p_tbl->ccb_idx][p_tbl->tcid].scb_hdl);
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/* put lcid in event data */
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if (p_scb != NULL) {
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open.peer_mtu = p_tbl->peer_mtu;
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open.lcid = avdt_cb.ad.rt_tbl[p_tbl->ccb_idx][p_tbl->tcid].lcid;
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open.hdr.err_code = avdt_ad_tcid_to_type(p_tbl->tcid);
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avdt_scb_event(p_scb, AVDT_SCB_TC_OPEN_EVT, (tAVDT_SCB_EVT *) &open);
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}
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}
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}
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/*******************************************************************************
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**
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** Function avdt_ad_tc_cong_ind
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**
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** Description This function is called by the L2CAP interface layer when
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** L2CAP calls the congestion callback. It looks up the CCB
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** or SCB for the channel and sends it a congestion event.
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** The is_congested parameter is the same value passed by
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** the L2CAP callback function.
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**
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**
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** Returns Nothing.
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**
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*******************************************************************************/
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void avdt_ad_tc_cong_ind(tAVDT_TC_TBL *p_tbl, BOOLEAN is_congested)
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{
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tAVDT_CCB *p_ccb;
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tAVDT_SCB *p_scb;
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/* if signaling channel, notify ccb of congestion */
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if (p_tbl->tcid == 0) {
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p_ccb = avdt_ccb_by_idx(p_tbl->ccb_idx);
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avdt_ccb_event(p_ccb, AVDT_CCB_LL_CONG_EVT, (tAVDT_CCB_EVT *) &is_congested);
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}
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/* if media or other channel, notify scb that channel open */
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else {
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/* look up scb in stream routing table by ccb, tcid */
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p_scb = avdt_scb_by_hdl(avdt_cb.ad.rt_tbl[p_tbl->ccb_idx][p_tbl->tcid].scb_hdl);
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if (p_scb != NULL) {
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avdt_scb_event(p_scb, AVDT_SCB_TC_CONG_EVT, (tAVDT_SCB_EVT *) &is_congested);
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}
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}
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}
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/*******************************************************************************
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**
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** Function avdt_ad_tc_data_ind
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**
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** Description This function is called by the L2CAP interface layer when
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** incoming data is received from L2CAP. It looks up the CCB
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** or SCB for the channel and routes the data accordingly.
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**
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**
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** Returns Nothing.
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**
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*******************************************************************************/
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void avdt_ad_tc_data_ind(tAVDT_TC_TBL *p_tbl, BT_HDR *p_buf)
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{
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tAVDT_CCB *p_ccb;
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tAVDT_SCB *p_scb;
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/* store type (media, recovery, reporting) */
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p_buf->layer_specific = avdt_ad_tcid_to_type(p_tbl->tcid);
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/* if signaling channel, handle control message */
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if (p_tbl->tcid == 0) {
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p_ccb = avdt_ccb_by_idx(p_tbl->ccb_idx);
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avdt_msg_ind(p_ccb, p_buf);
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}
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/* if media or other channel, send event to scb */
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else {
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p_scb = avdt_scb_by_hdl(avdt_cb.ad.rt_tbl[p_tbl->ccb_idx][p_tbl->tcid].scb_hdl);
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if (p_scb != NULL) {
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avdt_scb_event(p_scb, AVDT_SCB_TC_DATA_EVT, (tAVDT_SCB_EVT *) &p_buf);
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} else {
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GKI_freebuf(p_buf);
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AVDT_TRACE_ERROR(" avdt_ad_tc_data_ind buffer freed");
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}
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}
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}
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/*******************************************************************************
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**
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** Function avdt_ad_write_req
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**
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** Description This function is called by a CCB or SCB to send data to a
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** transport channel. It looks up the LCID of the channel
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** based on the type, CCB, and SCB (if present). Then it
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** passes the data to L2CA_DataWrite().
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**
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**
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** Returns AVDT_AD_SUCCESS, if data accepted, else FALSE
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** AVDT_AD_CONGESTED, if data accepted and the channel is congested
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** AVDT_AD_FAILED, if error
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**
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*******************************************************************************/
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UINT8 avdt_ad_write_req(UINT8 type, tAVDT_CCB *p_ccb, tAVDT_SCB *p_scb, BT_HDR *p_buf)
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{
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UINT8 tcid;
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/* get tcid from type, scb */
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tcid = avdt_ad_type_to_tcid(type, p_scb);
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return L2CA_DataWrite(avdt_cb.ad.rt_tbl[avdt_ccb_to_idx(p_ccb)][tcid].lcid, p_buf);
|
|
}
|
|
|
|
|
|
/*******************************************************************************
|
|
**
|
|
** Function avdt_ad_open_req
|
|
**
|
|
** Description This function is called by a CCB or SCB to open a transport
|
|
** channel. This function allocates and initializes a
|
|
** transport channel table entry. The channel can be opened
|
|
** in two roles: as an initiator or acceptor. When opened
|
|
** as an initiator the function will start an L2CAP connection.
|
|
** When opened as an acceptor the function simply configures
|
|
** the table entry to listen for an incoming channel.
|
|
**
|
|
**
|
|
** Returns Nothing.
|
|
**
|
|
*******************************************************************************/
|
|
void avdt_ad_open_req(UINT8 type, tAVDT_CCB *p_ccb, tAVDT_SCB *p_scb, UINT8 role)
|
|
{
|
|
tAVDT_TC_TBL *p_tbl;
|
|
UINT16 lcid;
|
|
|
|
if ((p_tbl = avdt_ad_tc_tbl_alloc(p_ccb)) == NULL) {
|
|
AVDT_TRACE_ERROR("avdt_ad_open_req: Cannot allocate p_tbl");
|
|
return;
|
|
}
|
|
|
|
|
|
p_tbl->tcid = avdt_ad_type_to_tcid(type, p_scb);
|
|
AVDT_TRACE_DEBUG("avdt_ad_open_req: type: %d, role: %d, tcid:%d\n",
|
|
type, role, p_tbl->tcid);
|
|
|
|
if (type == AVDT_CHAN_SIG) {
|
|
/* if signaling, get mtu from registration control block */
|
|
p_tbl->my_mtu = avdt_cb.rcb.ctrl_mtu;
|
|
p_tbl->my_flush_to = L2CAP_DEFAULT_FLUSH_TO;
|
|
} else {
|
|
/* otherwise get mtu from scb */
|
|
p_tbl->my_mtu = p_scb->cs.mtu;
|
|
p_tbl->my_flush_to = p_scb->cs.flush_to;
|
|
|
|
/* also set scb_hdl in rt_tbl */
|
|
avdt_cb.ad.rt_tbl[avdt_ccb_to_idx(p_ccb)][p_tbl->tcid].scb_hdl = avdt_scb_to_hdl(p_scb);
|
|
AVDT_TRACE_DEBUG("avdt_cb.ad.rt_tbl[%d][%d].scb_hdl = %d\n",
|
|
avdt_ccb_to_idx(p_ccb), p_tbl->tcid,
|
|
avdt_scb_to_hdl(p_scb));
|
|
}
|
|
|
|
/* if we're acceptor, we're done; just sit back and listen */
|
|
if (role == AVDT_ACP) {
|
|
p_tbl->state = AVDT_AD_ST_ACP;
|
|
}
|
|
/* else we're inititator, start the L2CAP connection */
|
|
else {
|
|
p_tbl->state = AVDT_AD_ST_CONN;
|
|
|
|
/* call l2cap connect req */
|
|
if ((lcid = L2CA_ConnectReq(AVDT_PSM, p_ccb->peer_addr)) != 0) {
|
|
/* if connect req ok, store tcid in lcid table */
|
|
avdt_cb.ad.lcid_tbl[lcid - L2CAP_BASE_APPL_CID] = avdt_ad_tc_tbl_to_idx(p_tbl);
|
|
AVDT_TRACE_DEBUG("avdt_cb.ad.lcid_tbl[%d] = %d\n",
|
|
(lcid - L2CAP_BASE_APPL_CID), avdt_ad_tc_tbl_to_idx(p_tbl));
|
|
|
|
avdt_cb.ad.rt_tbl[avdt_ccb_to_idx(p_ccb)][p_tbl->tcid].lcid = lcid;
|
|
AVDT_TRACE_DEBUG("avdt_cb.ad.rt_tbl[%d][%d].lcid = 0x%x\n",
|
|
avdt_ccb_to_idx(p_ccb), p_tbl->tcid,
|
|
lcid);
|
|
} else {
|
|
/* if connect req failed, call avdt_ad_tc_close_ind() */
|
|
avdt_ad_tc_close_ind(p_tbl, 0);
|
|
}
|
|
}
|
|
}
|
|
|
|
/*******************************************************************************
|
|
**
|
|
** Function avdt_ad_close_req
|
|
**
|
|
** Description This function is called by a CCB or SCB to close a
|
|
** transport channel. The function looks up the LCID for the
|
|
** channel and calls L2CA_DisconnectReq().
|
|
**
|
|
**
|
|
** Returns Nothing.
|
|
**
|
|
*******************************************************************************/
|
|
void avdt_ad_close_req(UINT8 type, tAVDT_CCB *p_ccb, tAVDT_SCB *p_scb)
|
|
{
|
|
UINT8 tcid;
|
|
tAVDT_TC_TBL *p_tbl;
|
|
|
|
p_tbl = avdt_ad_tc_tbl_by_type(type, p_ccb, p_scb);
|
|
AVDT_TRACE_DEBUG("avdt_ad_close_req state: %d\n", p_tbl->state);
|
|
|
|
switch (p_tbl->state) {
|
|
case AVDT_AD_ST_UNUSED:
|
|
/* probably for reporting */
|
|
break;
|
|
case AVDT_AD_ST_ACP:
|
|
/* if we're listening on this channel, send ourselves a close ind */
|
|
avdt_ad_tc_close_ind(p_tbl, 0);
|
|
break;
|
|
default:
|
|
/* get tcid from type, scb */
|
|
tcid = avdt_ad_type_to_tcid(type, p_scb);
|
|
|
|
/* call l2cap disconnect req */
|
|
L2CA_DisconnectReq(avdt_cb.ad.rt_tbl[avdt_ccb_to_idx(p_ccb)][tcid].lcid);
|
|
}
|
|
}
|
|
|
|
#endif /* #if (defined(AVDT_INCLUDED) && AVDT_INCLUDED == TRUE) */
|