295 lines
10 KiB
C++
295 lines
10 KiB
C++
/******************************************************************************
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*
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* Copyright (C) 2009-2012 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 is the implementation file for the MCAP Data chahnel state machine.
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*
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******************************************************************************/
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#include <string.h>
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#include "bt_target.h"
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#include "mca_api.h"
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#include "mca_defs.h"
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#include "mca_int.h"
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/*****************************************************************************
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* data channel state machine constants and types
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****************************************************************************/
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enum {
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MCA_DCB_TC_OPEN,
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MCA_DCB_CONG,
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MCA_DCB_FREE_DATA,
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MCA_DCB_DEALLOC,
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MCA_DCB_DO_DISCONN,
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MCA_DCB_SND_DATA,
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MCA_DCB_HDL_DATA,
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MCA_DCB_NUM_ACTIONS
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};
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#define MCA_DCB_IGNORE MCA_DCB_NUM_ACTIONS
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/* action function list */
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const tMCA_DCB_ACTION mca_dcb_action[] = {
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mca_dcb_tc_open, mca_dcb_cong, mca_dcb_free_data, mca_dcb_dealloc,
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mca_dcb_do_disconn, mca_dcb_snd_data, mca_dcb_hdl_data};
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/* state table information */
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#define MCA_DCB_ACTIONS 1 /* number of actions */
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#define MCA_DCB_ACT_COL 0 /* position of action function */
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#define MCA_DCB_NEXT_STATE 1 /* position of next state */
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#define MCA_DCB_NUM_COLS 2 /* number of columns in state tables */
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/* state table for opening state */
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const uint8_t mca_dcb_st_opening[][MCA_DCB_NUM_COLS] = {
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/* Event Action Next State */
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/* MCA_DCB_API_CLOSE_EVT */ {MCA_DCB_DO_DISCONN, MCA_DCB_CLOSING_ST},
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/* MCA_DCB_API_WRITE_EVT */ {MCA_DCB_IGNORE, MCA_DCB_OPENING_ST},
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/* MCA_DCB_TC_OPEN_EVT */ {MCA_DCB_TC_OPEN, MCA_DCB_OPEN_ST},
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/* MCA_DCB_TC_CLOSE_EVT */ {MCA_DCB_DEALLOC, MCA_DCB_NULL_ST},
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/* MCA_DCB_TC_CONG_EVT */ {MCA_DCB_CONG, MCA_DCB_OPENING_ST},
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/* MCA_DCB_TC_DATA_EVT */ {MCA_DCB_FREE_DATA, MCA_DCB_OPENING_ST}};
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/* state table for open state */
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const uint8_t mca_dcb_st_open[][MCA_DCB_NUM_COLS] = {
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/* Event Action Next State */
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/* MCA_DCB_API_CLOSE_EVT */ {MCA_DCB_DO_DISCONN, MCA_DCB_CLOSING_ST},
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/* MCA_DCB_API_WRITE_EVT */ {MCA_DCB_SND_DATA, MCA_DCB_OPEN_ST},
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/* MCA_DCB_TC_OPEN_EVT */ {MCA_DCB_IGNORE, MCA_DCB_OPEN_ST},
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/* MCA_DCB_TC_CLOSE_EVT */ {MCA_DCB_DEALLOC, MCA_DCB_NULL_ST},
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/* MCA_DCB_TC_CONG_EVT */ {MCA_DCB_CONG, MCA_DCB_OPEN_ST},
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/* MCA_DCB_TC_DATA_EVT */ {MCA_DCB_HDL_DATA, MCA_DCB_OPEN_ST}};
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/* state table for closing state */
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const uint8_t mca_dcb_st_closing[][MCA_DCB_NUM_COLS] = {
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/* Event Action Next State */
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/* MCA_DCB_API_CLOSE_EVT */ {MCA_DCB_IGNORE, MCA_DCB_CLOSING_ST},
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/* MCA_DCB_API_WRITE_EVT */ {MCA_DCB_IGNORE, MCA_DCB_CLOSING_ST},
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/* MCA_DCB_TC_OPEN_EVT */ {MCA_DCB_TC_OPEN, MCA_DCB_OPEN_ST},
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/* MCA_DCB_TC_CLOSE_EVT */ {MCA_DCB_DEALLOC, MCA_DCB_NULL_ST},
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/* MCA_DCB_TC_CONG_EVT */ {MCA_DCB_IGNORE, MCA_DCB_CLOSING_ST},
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/* MCA_DCB_TC_DATA_EVT */ {MCA_DCB_FREE_DATA, MCA_DCB_CLOSING_ST}};
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/* type for state table */
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typedef const uint8_t (*tMCA_DCB_ST_TBL)[MCA_DCB_NUM_COLS];
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/* state table */
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const tMCA_DCB_ST_TBL mca_dcb_st_tbl[] = {mca_dcb_st_opening, mca_dcb_st_open,
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mca_dcb_st_closing};
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/* verbose event strings for trace */
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const char* const mca_dcb_evt_str[] = {"API_CLOSE_EVT", "API_WRITE_EVT",
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"TC_OPEN_EVT", "TC_CLOSE_EVT",
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"TC_CONG_EVT", "TC_DATA_EVT"};
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/* verbose state strings for trace */
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const char* const mca_dcb_st_str[] = {"NULL_ST", "OPENING_ST", "OPEN_ST",
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"CLOSING_ST"};
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/*******************************************************************************
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*
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* Function mca_dcb_event
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*
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* Description This function is the DCB state machine main function.
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* It uses the state and action function tables to execute
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* action functions.
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*
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* Returns void.
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*
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******************************************************************************/
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void mca_dcb_event(tMCA_DCB* p_dcb, uint8_t event, tMCA_DCB_EVT* p_data) {
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tMCA_DCB_ST_TBL state_table;
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uint8_t action;
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if (p_dcb == NULL) return;
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MCA_TRACE_EVENT("DCB dcb=%d event=%s state=%s", mca_dcb_to_hdl(p_dcb),
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mca_dcb_evt_str[event], mca_dcb_st_str[p_dcb->state]);
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/* look up the state table for the current state */
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state_table = mca_dcb_st_tbl[p_dcb->state - 1];
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/* set next state */
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p_dcb->state = state_table[event][MCA_DCB_NEXT_STATE];
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/* execute action functions */
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action = state_table[event][MCA_DCB_ACT_COL];
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if (action != MCA_DCB_IGNORE) {
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(*mca_dcb_action[action])(p_dcb, p_data);
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}
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}
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/*******************************************************************************
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*
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* Function mca_dcb_alloc
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*
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* Description This function is called to allocate an DCB.
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* It initializes the DCB with the data passed to the function.
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*
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* Returns tMCA_DCB *
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*
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******************************************************************************/
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tMCA_DCB* mca_dcb_alloc(tMCA_CCB* p_ccb, tMCA_DEP dep) {
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tMCA_DCB *p_dcb = NULL, *p_dcb_tmp;
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tMCA_RCB* p_rcb = p_ccb->p_rcb;
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tMCA_CS* p_cs;
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int i, max;
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if (dep < MCA_NUM_DEPS) {
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p_cs = &p_rcb->dep[dep];
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i = mca_ccb_to_hdl(p_ccb) - 1;
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p_dcb_tmp = &mca_cb.dcb[i * MCA_NUM_MDLS];
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/* make sure p_cs->max_mdl is smaller than MCA_NUM_MDLS at MCA_CreateDep */
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max = p_cs->max_mdl;
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for (i = 0; i < max; i++, p_dcb_tmp++) {
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if (p_dcb_tmp->state == MCA_DCB_NULL_ST) {
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p_dcb_tmp->p_ccb = p_ccb;
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p_dcb_tmp->state = MCA_DCB_OPENING_ST;
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p_dcb_tmp->cong = true;
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p_dcb_tmp->p_cs = p_cs;
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p_dcb = p_dcb_tmp;
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break;
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}
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}
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}
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return p_dcb;
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}
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/*******************************************************************************
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*
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* Function mca_dep_free_mdl
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*
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* Description This function is called to check the number of free mdl for
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* the given dep.
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*
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* Returns the number of free mdl for the given dep
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*
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******************************************************************************/
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uint8_t mca_dep_free_mdl(tMCA_CCB* p_ccb, tMCA_DEP dep) {
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tMCA_DCB* p_dcb;
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tMCA_RCB* p_rcb = p_ccb->p_rcb;
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tMCA_CS* p_cs;
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int i, max;
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uint8_t count = 0;
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uint8_t left;
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if (dep < MCA_NUM_DEPS) {
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p_cs = &p_rcb->dep[dep];
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i = mca_ccb_to_hdl(p_ccb) - 1;
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p_dcb = &mca_cb.dcb[i * MCA_NUM_MDLS];
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/* make sure p_cs->max_mdl is smaller than MCA_NUM_MDLS at MCA_CreateDep */
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max = p_cs->max_mdl;
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for (i = 0; i < max; i++, p_dcb++) {
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if ((p_dcb->state != MCA_DCB_NULL_ST) && (p_dcb->p_cs == p_cs)) {
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count++;
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break;
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}
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}
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} else {
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max = 0;
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MCA_TRACE_WARNING("Invalid Dep ID");
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}
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left = max - count;
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return left;
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}
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/*******************************************************************************
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*
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* Function mca_dcb_dealloc
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*
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* Description This function deallocates an DCB.
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*
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* Returns void.
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*
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******************************************************************************/
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void mca_dcb_dealloc(tMCA_DCB* p_dcb, tMCA_DCB_EVT* p_data) {
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tMCA_CCB* p_ccb = p_dcb->p_ccb;
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uint8_t event = MCA_CLOSE_IND_EVT;
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tMCA_CTRL evt_data;
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MCA_TRACE_DEBUG("mca_dcb_dealloc");
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osi_free_and_reset((void**)&p_dcb->p_data);
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if (p_data) {
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/* non-NULL -> an action function -> report disconnect event */
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evt_data.close_cfm.mdl = mca_dcb_to_hdl(p_dcb);
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evt_data.close_cfm.reason = p_data->close.reason;
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evt_data.close_cfm.mdl_id = p_dcb->mdl_id;
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if (p_data->close.param == MCA_INT) event = MCA_CLOSE_CFM_EVT;
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if (p_data->close.lcid) mca_ccb_report_event(p_ccb, event, &evt_data);
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}
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mca_free_tc_tbl_by_lcid(p_dcb->lcid);
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memset(p_dcb, 0, sizeof(tMCA_DCB));
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}
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/*******************************************************************************
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*
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* Function mca_dcb_to_hdl
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*
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* Description Convert a pointer to a DCB to a handle (tMCA_DL).
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* It returns the handle.
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*
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* Returns tMCA_DL.
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*
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******************************************************************************/
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tMCA_DL mca_dcb_to_hdl(tMCA_DCB* p_dcb) {
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return (uint8_t)(p_dcb - mca_cb.dcb + 1);
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}
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/*******************************************************************************
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*
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* Function mca_dcb_by_hdl
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*
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* Description This function finds the DCB for a handle (tMCA_DL).
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* It returns a pointer to the DCB.
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* If no DCB matches the handle it returns NULL.
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*
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* Returns tMCA_DCB *
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*
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******************************************************************************/
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tMCA_DCB* mca_dcb_by_hdl(tMCA_DL hdl) {
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tMCA_DCB* p_dcb = NULL;
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if (hdl && hdl <= MCA_NUM_DCBS && mca_cb.dcb[hdl - 1].state)
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p_dcb = &mca_cb.dcb[hdl - 1];
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return p_dcb;
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}
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/*******************************************************************************
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*
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* Function mca_dcb_close_by_mdl_id
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*
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* Description This function finds the DCB for a mdl_id and
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* disconnect the mdl
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*
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* Returns void
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*
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******************************************************************************/
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void mca_dcb_close_by_mdl_id(tMCA_CCB* p_ccb, uint16_t mdl_id) {
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tMCA_DCB* p_dcb;
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int i;
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MCA_TRACE_DEBUG("mca_dcb_close_by_mdl_id mdl_id=%d", mdl_id);
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i = mca_ccb_to_hdl(p_ccb) - 1;
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p_dcb = &mca_cb.dcb[i * MCA_NUM_MDLS];
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for (i = 0; i < MCA_NUM_MDLS; i++, p_dcb++) {
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if (p_dcb->state) {
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if (p_dcb->mdl_id == mdl_id) {
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mca_dcb_event(p_dcb, MCA_DCB_API_CLOSE_EVT, NULL);
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break;
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} else if (mdl_id == MCA_ALL_MDL_ID) {
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mca_dcb_event(p_dcb, MCA_DCB_API_CLOSE_EVT, NULL);
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}
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}
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}
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}
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