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/*
* Copyright 2020 The Android Open Source Project
*
* 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.
*/
#define LOG_TAG "btm"
#include <cstdint>
#include "stack/btm/btm_int_types.h" // tBTM_CB
#include "stack/include/rfcdefs.h" // PORT_MAX_RFC_PORTS
extern tBTM_CB btm_cb;
/*******************************************************************************
*
* Function BTM_AllocateSCN
*
* Description Look through the Server Channel Numbers for a free one.
*
* Returns Allocated SCN number or 0 if none.
*
******************************************************************************/
uint8_t BTM_AllocateSCN(void) {
uint8_t x;
BTM_TRACE_DEBUG("BTM_AllocateSCN");
// stack reserves scn 1 for HFP, HSP we still do the correct way
for (x = 1; x < PORT_MAX_RFC_PORTS; x++) {
if (!btm_cb.btm_scn[x]) {
btm_cb.btm_scn[x] = true;
return (x + 1);
}
}
return (0); /* No free ports */
}
/*******************************************************************************
*
* Function BTM_TryAllocateSCN
*
* Description Try to allocate a fixed server channel
*
* Returns Returns true if server channel was available
*
******************************************************************************/
bool BTM_TryAllocateSCN(uint8_t scn) {
/* Make sure we don't exceed max port range.
* Stack reserves scn 1 for HFP, HSP we still do the correct way.
*/
if ((scn >= PORT_MAX_RFC_PORTS) || (scn == 1) || (scn == 0)) return false;
/* check if this port is available */
if (!btm_cb.btm_scn[scn - 1]) {
btm_cb.btm_scn[scn - 1] = true;
return true;
}
return (false); /* Port was busy */
}
/*******************************************************************************
*
* Function BTM_FreeSCN
*
* Description Free the specified SCN.
*
* Returns true or false
*
******************************************************************************/
bool BTM_FreeSCN(uint8_t scn) {
BTM_TRACE_DEBUG("BTM_FreeSCN ");
if (scn <= PORT_MAX_RFC_PORTS && scn > 0) {
btm_cb.btm_scn[scn - 1] = false;
return (true);
} else {
return (false); /* Illegal SCN passed in */
}
}
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