add stack/btm/btm_scn (1e483aba) · Commits · e / os / android_packages_modules_Bluetooth

system/stack/btm/btm_scn.cc

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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" // BTM_MAX_SCN

		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 < BTM_MAX_SCN; 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 >= BTM_MAX_SCN) \|\| (scn == 1)) 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 <= BTM_MAX_SCN) {
		btm_cb.btm_scn[scn - 1] = false;
		return (true);
		} else {
		return (false); /* Illegal SCN passed in */
		}
		}

system/stack/btm/btm_scn.h

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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.
		*/

		#pragma once

		#include <cstdint>

		bool BTM_FreeSCN(uint8_t scn);
		bool BTM_TryAllocateSCN(uint8_t scn);
		bool BTM_TryAllocateSCN(uint8_t scn);