/****************************************************************************** * * Copyright (C) 2009-2012 Broadcom Corporation * * 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. * ******************************************************************************/ /****************************************************************************** * * This is the implementation file for the MCAP Control channel state * machine. * ******************************************************************************/ #include #include "bt_target.h" #include "mca_api.h" #include "mca_defs.h" #include "mca_int.h" #include "btu.h" /***************************************************************************** ** data channel state machine constants and types *****************************************************************************/ enum { MCA_CCB_FREE_MSG, MCA_CCB_SND_REQ, MCA_CCB_SND_RSP, MCA_CCB_DO_DISCONN, MCA_CCB_CONG, MCA_CCB_HDL_REQ, MCA_CCB_HDL_RSP, MCA_CCB_LL_OPEN, MCA_CCB_DL_OPEN, MCA_CCB_DEALLOC, MCA_CCB_RSP_TOUT, MCA_CCB_NUM_ACTIONS }; #define MCA_CCB_IGNORE MCA_CCB_NUM_ACTIONS /* action function list */ const tMCA_CCB_ACTION mca_ccb_action[] = { mca_ccb_free_msg, mca_ccb_snd_req, mca_ccb_snd_rsp, mca_ccb_do_disconn, mca_ccb_cong, mca_ccb_hdl_req, mca_ccb_hdl_rsp, mca_ccb_ll_open, mca_ccb_dl_open, mca_ccb_dealloc, mca_ccb_rsp_tout, }; /* state table information */ #define MCA_CCB_ACTIONS 1 /* number of actions */ #define MCA_CCB_ACT_COL 0 /* position of action function */ #define MCA_CCB_NEXT_STATE 1 /* position of next state */ #define MCA_CCB_NUM_COLS 2 /* number of columns in state tables */ /* state table for opening state */ const UINT8 mca_ccb_st_opening[][MCA_CCB_NUM_COLS] = { /* Event Action Next State */ /* MCA_CCB_API_CONNECT_EVT */ {MCA_CCB_IGNORE, MCA_CCB_OPENING_ST}, /* MCA_CCB_API_DISCONNECT_EVT */ {MCA_CCB_DO_DISCONN, MCA_CCB_CLOSING_ST}, /* MCA_CCB_API_REQ_EVT */ {MCA_CCB_FREE_MSG, MCA_CCB_OPENING_ST}, /* MCA_CCB_API_RSP_EVT */ {MCA_CCB_IGNORE, MCA_CCB_OPENING_ST}, /* MCA_CCB_MSG_REQ_EVT */ {MCA_CCB_FREE_MSG, MCA_CCB_OPENING_ST}, /* MCA_CCB_MSG_RSP_EVT */ {MCA_CCB_FREE_MSG, MCA_CCB_OPENING_ST}, /* MCA_CCB_DL_OPEN_EVT */ {MCA_CCB_IGNORE, MCA_CCB_OPENING_ST}, /* MCA_CCB_LL_OPEN_EVT */ {MCA_CCB_LL_OPEN, MCA_CCB_OPEN_ST}, /* MCA_CCB_LL_CLOSE_EVT */ {MCA_CCB_DEALLOC, MCA_CCB_NULL_ST}, /* MCA_CCB_LL_CONG_EVT */ {MCA_CCB_CONG, MCA_CCB_OPENING_ST}, /* MCA_CCB_RSP_TOUT_EVT */ {MCA_CCB_IGNORE, MCA_CCB_OPENING_ST} }; /* state table for open state */ const UINT8 mca_ccb_st_open[][MCA_CCB_NUM_COLS] = { /* Event Action Next State */ /* MCA_CCB_API_CONNECT_EVT */ {MCA_CCB_IGNORE, MCA_CCB_OPEN_ST}, /* MCA_CCB_API_DISCONNECT_EVT */ {MCA_CCB_DO_DISCONN, MCA_CCB_CLOSING_ST}, /* MCA_CCB_API_REQ_EVT */ {MCA_CCB_SND_REQ, MCA_CCB_OPEN_ST}, /* MCA_CCB_API_RSP_EVT */ {MCA_CCB_SND_RSP, MCA_CCB_OPEN_ST}, /* MCA_CCB_MSG_REQ_EVT */ {MCA_CCB_HDL_REQ, MCA_CCB_OPEN_ST}, /* MCA_CCB_MSG_RSP_EVT */ {MCA_CCB_HDL_RSP, MCA_CCB_OPEN_ST}, /* MCA_CCB_DL_OPEN_EVT */ {MCA_CCB_DL_OPEN, MCA_CCB_OPEN_ST}, /* MCA_CCB_LL_OPEN_EVT */ {MCA_CCB_IGNORE, MCA_CCB_OPEN_ST}, /* MCA_CCB_LL_CLOSE_EVT */ {MCA_CCB_DEALLOC, MCA_CCB_NULL_ST}, /* MCA_CCB_LL_CONG_EVT */ {MCA_CCB_CONG, MCA_CCB_OPEN_ST}, /* MCA_CCB_RSP_TOUT_EVT */ {MCA_CCB_RSP_TOUT, MCA_CCB_OPEN_ST} }; /* state table for closing state */ const UINT8 mca_ccb_st_closing[][MCA_CCB_NUM_COLS] = { /* Event Action Next State */ /* MCA_CCB_API_CONNECT_EVT */ {MCA_CCB_IGNORE, MCA_CCB_CLOSING_ST}, /* MCA_CCB_API_DISCONNECT_EVT */ {MCA_CCB_IGNORE, MCA_CCB_CLOSING_ST}, /* MCA_CCB_API_REQ_EVT */ {MCA_CCB_FREE_MSG, MCA_CCB_CLOSING_ST}, /* MCA_CCB_API_RSP_EVT */ {MCA_CCB_IGNORE, MCA_CCB_CLOSING_ST}, /* MCA_CCB_MSG_REQ_EVT */ {MCA_CCB_FREE_MSG, MCA_CCB_CLOSING_ST}, /* MCA_CCB_MSG_RSP_EVT */ {MCA_CCB_FREE_MSG, MCA_CCB_CLOSING_ST}, /* MCA_CCB_DL_OPEN_EVT */ {MCA_CCB_IGNORE, MCA_CCB_CLOSING_ST}, /* MCA_CCB_LL_OPEN_EVT */ {MCA_CCB_IGNORE, MCA_CCB_CLOSING_ST}, /* MCA_CCB_LL_CLOSE_EVT */ {MCA_CCB_DEALLOC, MCA_CCB_NULL_ST}, /* MCA_CCB_LL_CONG_EVT */ {MCA_CCB_IGNORE, MCA_CCB_CLOSING_ST}, /* MCA_CCB_RSP_TOUT_EVT */ {MCA_CCB_IGNORE, MCA_CCB_CLOSING_ST} }; /* type for state table */ typedef const UINT8 (*tMCA_CCB_ST_TBL)[MCA_CCB_NUM_COLS]; /* state table */ const tMCA_CCB_ST_TBL mca_ccb_st_tbl[] = { mca_ccb_st_opening, mca_ccb_st_open, mca_ccb_st_closing }; #if (BT_TRACE_VERBOSE == TRUE) /* verbose event strings for trace */ static const char * const mca_ccb_evt_str[] = { "API_CONNECT_EVT", "API_DISCONNECT_EVT", "API_REQ_EVT", "API_RSP_EVT", "MSG_REQ_EVT", "MSG_RSP_EVT", "DL_OPEN_EVT", "LL_OPEN_EVT", "LL_CLOSE_EVT", "LL_CONG_EVT", "RSP_TOUT_EVT" }; /* verbose state strings for trace */ static const char * const mca_ccb_st_str[] = { "NULL_ST", "OPENING_ST", "OPEN_ST", "CLOSING_ST" }; #endif /******************************************************************************* ** ** Function mca_stop_timer ** ** Description This function is stop a MCAP timer ** ** This function is for use internal to MCAP only. ** ** Returns void ** *******************************************************************************/ void mca_stop_timer(tMCA_CCB *p_ccb) { alarm_cancel(p_ccb->mca_ccb_timer); } /******************************************************************************* ** ** Function mca_ccb_event ** ** Description This function is the CCB state machine main function. ** It uses the state and action function tables to execute ** action functions. ** ** Returns void. ** *******************************************************************************/ void mca_ccb_event(tMCA_CCB *p_ccb, UINT8 event, tMCA_CCB_EVT *p_data) { tMCA_CCB_ST_TBL state_table; UINT8 action; #if (BT_TRACE_VERBOSE == TRUE) MCA_TRACE_EVENT("CCB ccb=%d event=%s state=%s", mca_ccb_to_hdl(p_ccb), mca_ccb_evt_str[event], mca_ccb_st_str[p_ccb->state]); #else MCA_TRACE_EVENT("CCB ccb=%d event=%d state=%d", mca_ccb_to_hdl(p_ccb), event, p_ccb->state); #endif /* look up the state table for the current state */ state_table = mca_ccb_st_tbl[p_ccb->state - 1]; /* set next state */ p_ccb->state = state_table[event][MCA_CCB_NEXT_STATE]; /* execute action functions */ if ((action = state_table[event][MCA_CCB_ACT_COL]) != MCA_CCB_IGNORE) { (*mca_ccb_action[action])(p_ccb, p_data); } } /******************************************************************************* ** ** Function mca_ccb_by_bd ** ** Description This function looks up the CCB based on the BD address. ** It returns a pointer to the CCB. ** If no CCB is found it returns NULL. ** ** Returns void. ** *******************************************************************************/ tMCA_CCB *mca_ccb_by_bd(tMCA_HANDLE handle, BD_ADDR bd_addr) { tMCA_CCB *p_ccb = NULL; tMCA_RCB *p_rcb = mca_rcb_by_handle(handle); tMCA_CCB *p_ccb_tmp; int i; if (p_rcb) { i = handle-1; p_ccb_tmp = &mca_cb.ccb[i*MCA_NUM_LINKS]; for (i=0; istate != MCA_CCB_NULL_ST && memcmp(p_ccb_tmp->peer_addr, bd_addr, BD_ADDR_LEN) == 0) { p_ccb = p_ccb_tmp; break; } } } return p_ccb; } /******************************************************************************* ** ** Function mca_ccb_alloc ** ** Description This function allocates a CCB and copies the BD address to ** the CCB. It returns a pointer to the CCB. If no CCB can ** be allocated it returns NULL. ** ** Returns void. ** *******************************************************************************/ tMCA_CCB *mca_ccb_alloc(tMCA_HANDLE handle, BD_ADDR bd_addr) { tMCA_CCB *p_ccb = NULL; tMCA_RCB *p_rcb = mca_rcb_by_handle(handle); tMCA_CCB *p_ccb_tmp; int i; MCA_TRACE_DEBUG("mca_ccb_alloc handle:0x%x", handle); if (p_rcb) { i = handle-1; p_ccb_tmp = &mca_cb.ccb[i*MCA_NUM_LINKS]; for (i=0; istate == MCA_CCB_NULL_ST) { p_ccb_tmp->p_rcb = p_rcb; p_ccb_tmp->mca_ccb_timer = alarm_new("mca.mca_ccb_timer"); p_ccb_tmp->state = MCA_CCB_OPENING_ST; p_ccb_tmp->cong = TRUE; memcpy(p_ccb_tmp->peer_addr, bd_addr, BD_ADDR_LEN); p_ccb = p_ccb_tmp; break; } } } return p_ccb; } /******************************************************************************* ** ** Function mca_ccb_dealloc ** ** Description This function deallocates a CCB. ** ** Returns void. ** *******************************************************************************/ void mca_ccb_dealloc(tMCA_CCB *p_ccb, tMCA_CCB_EVT *p_data) { tMCA_CTRL evt_data; MCA_TRACE_DEBUG("mca_ccb_dealloc ctrl_vpsm:0x%x", p_ccb->ctrl_vpsm); mca_dcb_close_by_mdl_id (p_ccb, MCA_ALL_MDL_ID); if (p_ccb->ctrl_vpsm) { L2CA_Deregister (p_ccb->ctrl_vpsm); } if (p_ccb->data_vpsm) { L2CA_Deregister (p_ccb->data_vpsm); } osi_free_and_reset((void **)&p_ccb->p_rx_msg); osi_free_and_reset((void **)&p_ccb->p_tx_req); mca_stop_timer(p_ccb); if (p_data) { /* non-NULL -> an action function -> report disconnect event */ memcpy (evt_data.disconnect_ind.bd_addr, p_ccb->peer_addr, BD_ADDR_LEN); evt_data.disconnect_ind.reason = p_data->close.reason; mca_ccb_report_event(p_ccb, MCA_DISCONNECT_IND_EVT, &evt_data); } mca_free_tc_tbl_by_lcid (p_ccb->lcid); alarm_free(p_ccb->mca_ccb_timer); memset(p_ccb, 0, sizeof(tMCA_CCB)); } /******************************************************************************* ** ** Function mca_ccb_to_hdl ** ** Description This function converts a pointer to a CCB to a tMCA_CL ** and returns the value. ** ** Returns void. ** *******************************************************************************/ tMCA_CL mca_ccb_to_hdl(tMCA_CCB *p_ccb) { return (UINT8) (p_ccb - mca_cb.ccb + 1); } /******************************************************************************* ** ** Function mca_ccb_by_hdl ** ** Description This function converts an index value to a CCB. It returns ** a pointer to the CCB. If no valid CCB matches the index it ** returns NULL. ** ** Returns void. ** *******************************************************************************/ tMCA_CCB *mca_ccb_by_hdl(tMCA_CL mcl) { tMCA_CCB * p_ccb = NULL; if (mcl && mcl <= MCA_NUM_CCBS && mca_cb.ccb[mcl-1].state) p_ccb = &mca_cb.ccb[mcl-1]; return p_ccb; } /******************************************************************************* ** ** Function mca_ccb_uses_mdl_id ** ** Description This function checkes if a given mdl_id is in use. ** ** Returns TRUE, if the given mdl_id is currently used in the MCL. ** *******************************************************************************/ BOOLEAN mca_ccb_uses_mdl_id(tMCA_CCB *p_ccb, UINT16 mdl_id) { BOOLEAN uses = FALSE; tMCA_DCB *p_dcb; int i; i = mca_ccb_to_hdl(p_ccb)-1; p_dcb = &mca_cb.dcb[i*MCA_NUM_MDLS]; for (i=0; istate != MCA_DCB_NULL_ST && p_dcb->mdl_id == mdl_id) { uses = TRUE; break; } } return uses; }