/****************************************************************************** * * Copyright (C) 2004-2012 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 file contains the PAN main functions and state machine. * ******************************************************************************/ #include "bt_target.h" #if defined(BTA_PAN_INCLUDED) && (BTA_PAN_INCLUDED == TRUE) #include #include "bta_api.h" #include "bta_sys.h" #include "bt_common.h" #include "pan_api.h" #include "bta_pan_api.h" #include "bta_pan_int.h" #include "utl.h" /***************************************************************************** ** Constants and types *****************************************************************************/ /* state machine action enumeration list */ enum { BTA_PAN_API_CLOSE, BTA_PAN_TX_PATH, BTA_PAN_RX_PATH, BTA_PAN_TX_FLOW, BTA_PAN_WRITE_BUF, BTA_PAN_CONN_OPEN, BTA_PAN_CONN_CLOSE, BTA_PAN_FREE_BUF, BTA_PAN_IGNORE }; /* type for action functions */ typedef void (*tBTA_PAN_ACTION)(tBTA_PAN_SCB *p_scb, tBTA_PAN_DATA *p_data); /* action function list */ const tBTA_PAN_ACTION bta_pan_action[] = { bta_pan_api_close, bta_pan_tx_path, bta_pan_rx_path, bta_pan_tx_flow, bta_pan_write_buf, bta_pan_conn_open, bta_pan_conn_close, bta_pan_free_buf, }; /* state table information */ #define BTA_PAN_ACTIONS 1 /* number of actions */ #define BTA_PAN_NEXT_STATE 1 /* position of next state */ #define BTA_PAN_NUM_COLS 2 /* number of columns in state tables */ /* state table for listen state */ const UINT8 bta_pan_st_idle[][BTA_PAN_NUM_COLS] = { /* API_CLOSE */ {BTA_PAN_API_CLOSE, BTA_PAN_IDLE_ST}, /* CI_TX_READY */ {BTA_PAN_IGNORE, BTA_PAN_IDLE_ST}, /* CI_RX_READY */ {BTA_PAN_IGNORE, BTA_PAN_IDLE_ST}, /* CI_TX_FLOW */ {BTA_PAN_IGNORE, BTA_PAN_IDLE_ST}, /* CI_RX_WRITE */ {BTA_PAN_IGNORE, BTA_PAN_IDLE_ST}, /* CI_RX_WRITEBUF */ {BTA_PAN_IGNORE, BTA_PAN_IDLE_ST}, /* PAN_CONN_OPEN */ {BTA_PAN_CONN_OPEN, BTA_PAN_OPEN_ST}, /* PAN_CONN_CLOSE */ {BTA_PAN_CONN_OPEN, BTA_PAN_IDLE_ST}, /* FLOW_ENABLE */ {BTA_PAN_IGNORE, BTA_PAN_IDLE_ST}, /* BNEP_DATA */ {BTA_PAN_IGNORE, BTA_PAN_IDLE_ST} }; /* state table for open state */ const UINT8 bta_pan_st_open[][BTA_PAN_NUM_COLS] = { /* API_CLOSE */ {BTA_PAN_API_CLOSE, BTA_PAN_OPEN_ST}, /* CI_TX_READY */ {BTA_PAN_TX_PATH, BTA_PAN_OPEN_ST}, /* CI_RX_READY */ {BTA_PAN_RX_PATH, BTA_PAN_OPEN_ST}, /* CI_TX_FLOW */ {BTA_PAN_TX_FLOW, BTA_PAN_OPEN_ST}, /* CI_RX_WRITE */ {BTA_PAN_IGNORE, BTA_PAN_OPEN_ST}, /* CI_RX_WRITEBUF */ {BTA_PAN_WRITE_BUF, BTA_PAN_OPEN_ST}, /* PAN_CONN_OPEN */ {BTA_PAN_IGNORE, BTA_PAN_OPEN_ST}, /* PAN_CONN_CLOSE */ {BTA_PAN_CONN_CLOSE, BTA_PAN_IDLE_ST}, /* FLOW_ENABLE */ {BTA_PAN_RX_PATH, BTA_PAN_OPEN_ST}, /* BNEP_DATA */ {BTA_PAN_TX_PATH, BTA_PAN_OPEN_ST} }; /* state table for closing state */ const UINT8 bta_pan_st_closing[][BTA_PAN_NUM_COLS] = { /* API_CLOSE */ {BTA_PAN_IGNORE, BTA_PAN_CLOSING_ST}, /* CI_TX_READY */ {BTA_PAN_TX_PATH, BTA_PAN_CLOSING_ST}, /* CI_RX_READY */ {BTA_PAN_RX_PATH, BTA_PAN_CLOSING_ST}, /* CI_TX_FLOW */ {BTA_PAN_TX_FLOW, BTA_PAN_CLOSING_ST}, /* CI_RX_WRITE */ {BTA_PAN_IGNORE, BTA_PAN_CLOSING_ST}, /* CI_RX_WRITEBUF */ {BTA_PAN_FREE_BUF, BTA_PAN_CLOSING_ST}, /* PAN_CONN_OPEN */ {BTA_PAN_IGNORE, BTA_PAN_CLOSING_ST}, /* PAN_CONN_CLOSE */ {BTA_PAN_CONN_CLOSE, BTA_PAN_IDLE_ST}, /* FLOW_ENABLE */ {BTA_PAN_RX_PATH, BTA_PAN_CLOSING_ST}, /* BNEP_DATA */ {BTA_PAN_TX_PATH, BTA_PAN_CLOSING_ST} }; /* type for state table */ typedef const UINT8 (*tBTA_PAN_ST_TBL)[BTA_PAN_NUM_COLS]; /* state table */ const tBTA_PAN_ST_TBL bta_pan_st_tbl[] = { bta_pan_st_idle, bta_pan_st_open, bta_pan_st_closing }; /***************************************************************************** ** Global data *****************************************************************************/ /* PAN control block */ #if BTA_DYNAMIC_MEMORY == FALSE tBTA_PAN_CB bta_pan_cb; #endif /******************************************************************************* ** ** Function bta_pan_scb_alloc ** ** Description Allocate a PAN server control block. ** ** ** Returns pointer to the scb, or NULL if none could be allocated. ** *******************************************************************************/ tBTA_PAN_SCB *bta_pan_scb_alloc(void) { tBTA_PAN_SCB *p_scb = &bta_pan_cb.scb[0]; int i; for (i = 0; i < BTA_PAN_NUM_CONN; i++, p_scb++) { if (!p_scb->in_use) { p_scb->in_use = TRUE; APPL_TRACE_DEBUG("bta_pan_scb_alloc %d", i); break; } } if (i == BTA_PAN_NUM_CONN) { /* out of scbs */ p_scb = NULL; APPL_TRACE_WARNING("Out of scbs"); } return p_scb; } /******************************************************************************* ** ** Function bta_pan_sm_execute ** ** Description State machine event handling function for PAN ** ** ** Returns void ** *******************************************************************************/ static void bta_pan_sm_execute(tBTA_PAN_SCB *p_scb, UINT16 event, tBTA_PAN_DATA *p_data) { tBTA_PAN_ST_TBL state_table; UINT8 action; int i; APPL_TRACE_EVENT("PAN scb=%d event=0x%x state=%d", bta_pan_scb_to_idx(p_scb), event, p_scb->state); /* look up the state table for the current state */ state_table = bta_pan_st_tbl[p_scb->state]; event &= 0x00FF; /* set next state */ p_scb->state = state_table[event][BTA_PAN_NEXT_STATE]; /* execute action functions */ for (i = 0; i < BTA_PAN_ACTIONS; i++) { if ((action = state_table[event][i]) != BTA_PAN_IGNORE) { (*bta_pan_action[action])(p_scb, p_data); } else { break; } } } /******************************************************************************* ** ** Function bta_pan_api_enable ** ** Description Handle an API enable event. ** ** ** Returns void ** *******************************************************************************/ static void bta_pan_api_enable(tBTA_PAN_DATA *p_data) { /* initialize control block */ memset(&bta_pan_cb, 0, sizeof(bta_pan_cb)); /* store callback function */ bta_pan_cb.p_cback = p_data->api_enable.p_cback; bta_pan_enable(p_data); } /******************************************************************************* ** ** Function bta_pan_api_disable ** ** Description Handle an API disable event. ** ** ** Returns void ** *******************************************************************************/ static void bta_pan_api_disable(tBTA_PAN_DATA *p_data) { UNUSED(p_data); bta_pan_disable(); } /******************************************************************************* ** ** Function bta_pan_api_open ** ** Description Handle an API listen event. ** ** ** Returns void ** *******************************************************************************/ static void bta_pan_api_open(tBTA_PAN_DATA *p_data) { tBTA_PAN_SCB *p_scb; tBTA_PAN_OPEN data; /* allocate an scb */ if ((p_scb = bta_pan_scb_alloc()) != NULL) { bta_pan_open(p_scb, p_data); } else { bdcpy(data.bd_addr, p_data->api_open.bd_addr); data.status = BTA_PAN_FAIL; bta_pan_cb.p_cback(BTA_PAN_OPEN_EVT, (tBTA_PAN *)&data); } } /******************************************************************************* ** ** Function bta_pan_scb_dealloc ** ** Description Deallocate a link control block. ** ** ** Returns void ** *******************************************************************************/ void bta_pan_scb_dealloc(tBTA_PAN_SCB *p_scb) { APPL_TRACE_DEBUG("bta_pan_scb_dealloc %d", bta_pan_scb_to_idx(p_scb)); fixed_queue_free(p_scb->data_queue, NULL); memset(p_scb, 0, sizeof(tBTA_PAN_SCB)); } /******************************************************************************* ** ** Function bta_pan_scb_to_idx ** ** Description Given a pointer to an scb, return its index. ** ** ** Returns Index of scb. ** *******************************************************************************/ UINT8 bta_pan_scb_to_idx(tBTA_PAN_SCB *p_scb) { return ((UINT8) (p_scb - bta_pan_cb.scb)) + 1; } /******************************************************************************* ** ** Function bta_pan_scb_by_handle ** ** Description Find scb associated with handle. ** ** ** Returns Pointer to scb or NULL if not found. ** *******************************************************************************/ tBTA_PAN_SCB *bta_pan_scb_by_handle(UINT16 handle) { tBTA_PAN_SCB *p_scb = &bta_pan_cb.scb[0]; UINT8 i; for (i = 0; i < BTA_PAN_NUM_CONN; i++, p_scb++) { if (p_scb->handle == handle) { return p_scb;; } } APPL_TRACE_WARNING("No scb for handle %d", handle); return NULL; } /******************************************************************************* ** ** Function bta_pan_hdl_event ** ** Description Data gateway main event handling function. ** ** ** Returns void ** *******************************************************************************/ BOOLEAN bta_pan_hdl_event(BT_HDR *p_msg) { tBTA_PAN_SCB *p_scb; BOOLEAN freebuf = TRUE; switch (p_msg->event) { /* handle enable event */ case BTA_PAN_API_ENABLE_EVT: bta_pan_api_enable((tBTA_PAN_DATA *) p_msg); break; /* handle disable event */ case BTA_PAN_API_DISABLE_EVT: bta_pan_api_disable((tBTA_PAN_DATA *) p_msg); break; /* handle set role event */ case BTA_PAN_API_SET_ROLE_EVT: bta_pan_set_role((tBTA_PAN_DATA *) p_msg); break; /* handle open event */ case BTA_PAN_API_OPEN_EVT: bta_pan_api_open((tBTA_PAN_DATA *) p_msg); break; /* events that require buffer not be released */ case BTA_PAN_CI_RX_WRITEBUF_EVT: freebuf = FALSE; if ((p_scb = bta_pan_scb_by_handle(p_msg->layer_specific)) != NULL) { bta_pan_sm_execute(p_scb, p_msg->event, (tBTA_PAN_DATA *) p_msg); } break; /* all other events */ default: if ((p_scb = bta_pan_scb_by_handle(p_msg->layer_specific)) != NULL) { bta_pan_sm_execute(p_scb, p_msg->event, (tBTA_PAN_DATA *) p_msg); } break; } return freebuf; } #endif /* BTA_PAN_INCLUDED */