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355 lines
11 KiB
355 lines
11 KiB
/******************************************************************************
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*
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* Copyright 2004-2012 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 file contains the PAN main functions and state machine.
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*
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******************************************************************************/
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#include <cstdint>
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#include "bt_target.h" // Must be first to define build configuration
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#if (BTA_PAN_INCLUDED == TRUE)
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#include "bta/pan/bta_pan_int.h"
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#include "osi/include/osi.h" // UNUSED_ATTR
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/*****************************************************************************
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* Constants and types
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****************************************************************************/
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/* state machine action enumeration list */
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enum {
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BTA_PAN_API_CLOSE,
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BTA_PAN_TX_PATH,
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BTA_PAN_RX_PATH,
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BTA_PAN_TX_FLOW,
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BTA_PAN_WRITE_BUF,
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BTA_PAN_CONN_OPEN,
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BTA_PAN_CONN_CLOSE,
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BTA_PAN_FREE_BUF,
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BTA_PAN_IGNORE,
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BTA_PAN_MAX_ACTIONS
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};
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/* type for action functions */
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typedef void (*tBTA_PAN_ACTION)(tBTA_PAN_SCB* p_scb, tBTA_PAN_DATA* p_data);
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/* action function list */
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const tBTA_PAN_ACTION bta_pan_action[] = {
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bta_pan_api_close, bta_pan_tx_path, bta_pan_rx_path, bta_pan_tx_flow,
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bta_pan_write_buf, bta_pan_conn_open, bta_pan_conn_close, bta_pan_free_buf,
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};
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/* state table information */
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#define BTA_PAN_ACTIONS 1 /* number of actions */
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#define BTA_PAN_NEXT_STATE 1 /* position of next state */
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#define BTA_PAN_NUM_COLS 2 /* number of columns in state tables */
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/* state table for listen state */
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const uint8_t bta_pan_st_idle[][BTA_PAN_NUM_COLS] = {
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/* API_CLOSE */ {BTA_PAN_API_CLOSE, BTA_PAN_IDLE_ST},
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/* CI_TX_READY */ {BTA_PAN_IGNORE, BTA_PAN_IDLE_ST},
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/* CI_RX_READY */ {BTA_PAN_IGNORE, BTA_PAN_IDLE_ST},
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/* CI_TX_FLOW */ {BTA_PAN_IGNORE, BTA_PAN_IDLE_ST},
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/* CI_RX_WRITE */ {BTA_PAN_IGNORE, BTA_PAN_IDLE_ST},
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/* CI_RX_WRITEBUF */ {BTA_PAN_IGNORE, BTA_PAN_IDLE_ST},
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/* PAN_CONN_OPEN */ {BTA_PAN_CONN_OPEN, BTA_PAN_OPEN_ST},
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/* PAN_CONN_CLOSE */ {BTA_PAN_CONN_OPEN, BTA_PAN_IDLE_ST},
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/* FLOW_ENABLE */ {BTA_PAN_IGNORE, BTA_PAN_IDLE_ST},
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/* BNEP_DATA */ {BTA_PAN_IGNORE, BTA_PAN_IDLE_ST}
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};
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/* state table for open state */
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const uint8_t bta_pan_st_open[][BTA_PAN_NUM_COLS] = {
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/* API_CLOSE */ {BTA_PAN_API_CLOSE, BTA_PAN_OPEN_ST},
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/* CI_TX_READY */ {BTA_PAN_TX_PATH, BTA_PAN_OPEN_ST},
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/* CI_RX_READY */ {BTA_PAN_RX_PATH, BTA_PAN_OPEN_ST},
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/* CI_TX_FLOW */ {BTA_PAN_TX_FLOW, BTA_PAN_OPEN_ST},
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/* CI_RX_WRITE */ {BTA_PAN_IGNORE, BTA_PAN_OPEN_ST},
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/* CI_RX_WRITEBUF */ {BTA_PAN_WRITE_BUF, BTA_PAN_OPEN_ST},
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/* PAN_CONN_OPEN */ {BTA_PAN_IGNORE, BTA_PAN_OPEN_ST},
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/* PAN_CONN_CLOSE */ {BTA_PAN_CONN_CLOSE, BTA_PAN_IDLE_ST},
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/* FLOW_ENABLE */ {BTA_PAN_RX_PATH, BTA_PAN_OPEN_ST},
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/* BNEP_DATA */ {BTA_PAN_TX_PATH, BTA_PAN_OPEN_ST}};
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/* state table for closing state */
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const uint8_t bta_pan_st_closing[][BTA_PAN_NUM_COLS] = {
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/* API_CLOSE */ {BTA_PAN_IGNORE, BTA_PAN_CLOSING_ST},
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/* CI_TX_READY */ {BTA_PAN_TX_PATH, BTA_PAN_CLOSING_ST},
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/* CI_RX_READY */ {BTA_PAN_RX_PATH, BTA_PAN_CLOSING_ST},
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/* CI_TX_FLOW */ {BTA_PAN_TX_FLOW, BTA_PAN_CLOSING_ST},
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/* CI_RX_WRITE */ {BTA_PAN_IGNORE, BTA_PAN_CLOSING_ST},
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/* CI_RX_WRITEBUF */ {BTA_PAN_FREE_BUF, BTA_PAN_CLOSING_ST},
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/* PAN_CONN_OPEN */ {BTA_PAN_IGNORE, BTA_PAN_CLOSING_ST},
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/* PAN_CONN_CLOSE */ {BTA_PAN_CONN_CLOSE, BTA_PAN_IDLE_ST},
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/* FLOW_ENABLE */ {BTA_PAN_RX_PATH, BTA_PAN_CLOSING_ST},
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/* BNEP_DATA */ {BTA_PAN_TX_PATH, BTA_PAN_CLOSING_ST}};
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/* type for state table */
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typedef const uint8_t (*tBTA_PAN_ST_TBL)[BTA_PAN_NUM_COLS];
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/* state table */
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const tBTA_PAN_ST_TBL bta_pan_st_tbl[] = {bta_pan_st_idle, bta_pan_st_open,
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bta_pan_st_closing};
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/*****************************************************************************
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* Global data
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****************************************************************************/
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/* PAN control block */
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tBTA_PAN_CB bta_pan_cb;
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/*******************************************************************************
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*
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* Function bta_pan_scb_alloc
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*
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* Description Allocate a PAN server control block.
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*
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*
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* Returns pointer to the scb, or NULL if none could be allocated.
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*
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******************************************************************************/
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tBTA_PAN_SCB* bta_pan_scb_alloc(void) {
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tBTA_PAN_SCB* p_scb = &bta_pan_cb.scb[0];
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int i;
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for (i = 0; i < BTA_PAN_NUM_CONN; i++, p_scb++) {
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if (!p_scb->in_use) {
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p_scb->in_use = true;
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APPL_TRACE_DEBUG("bta_pan_scb_alloc %d", i);
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break;
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}
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}
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if (i == BTA_PAN_NUM_CONN) {
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/* out of scbs */
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p_scb = NULL;
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APPL_TRACE_WARNING("Out of scbs");
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}
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return p_scb;
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}
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/*******************************************************************************
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*
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* Function bta_pan_sm_execute
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*
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* Description State machine event handling function for PAN
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*
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*
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* Returns void
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*
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******************************************************************************/
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static void bta_pan_sm_execute(tBTA_PAN_SCB* p_scb, uint16_t event,
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tBTA_PAN_DATA* p_data) {
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tBTA_PAN_ST_TBL state_table;
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uint8_t action;
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int i;
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APPL_TRACE_EVENT("PAN scb=%d event=0x%x state=%d", bta_pan_scb_to_idx(p_scb),
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event, p_scb->state);
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/* look up the state table for the current state */
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state_table = bta_pan_st_tbl[p_scb->state];
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event &= 0x00FF;
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/* set next state */
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p_scb->state = state_table[event][BTA_PAN_NEXT_STATE];
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/* execute action functions */
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for (i = 0; i < BTA_PAN_ACTIONS; i++) {
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action = state_table[event][i];
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CHECK(action < BTA_PAN_MAX_ACTIONS);
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if (action == BTA_PAN_IGNORE) continue;
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(*bta_pan_action[action])(p_scb, p_data);
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}
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}
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/*******************************************************************************
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*
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* Function bta_pan_api_enable
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*
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* Description Handle an API enable event.
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*
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*
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* Returns void
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*
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******************************************************************************/
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static void bta_pan_api_enable(tBTA_PAN_DATA* p_data) {
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/* initialize control block */
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memset(&bta_pan_cb, 0, sizeof(bta_pan_cb));
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/* store callback function */
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bta_pan_cb.p_cback = p_data->api_enable.p_cback;
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bta_pan_enable(p_data);
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}
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/*******************************************************************************
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*
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* Function bta_pan_api_disable
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*
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* Description Handle an API disable event.
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*
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*
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* Returns void
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*
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******************************************************************************/
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static void bta_pan_api_disable(UNUSED_ATTR tBTA_PAN_DATA* p_data) {
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bta_pan_disable();
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}
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/*******************************************************************************
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*
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* Function bta_pan_api_open
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*
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* Description Handle an API listen event.
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*
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*
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* Returns void
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*
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******************************************************************************/
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static void bta_pan_api_open(tBTA_PAN_DATA* p_data) {
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tBTA_PAN_SCB* p_scb;
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tBTA_PAN bta_pan;
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/* allocate an scb */
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p_scb = bta_pan_scb_alloc();
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if (p_scb != NULL) {
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bta_pan_open(p_scb, p_data);
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} else {
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bta_pan.open.bd_addr = p_data->api_open.bd_addr;
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bta_pan.open.status = BTA_PAN_FAIL;
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bta_pan_cb.p_cback(BTA_PAN_OPEN_EVT, &bta_pan);
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}
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}
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/*******************************************************************************
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*
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* Function bta_pan_scb_dealloc
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*
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* Description Deallocate a link control block.
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*
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*
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* Returns void
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*
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******************************************************************************/
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void bta_pan_scb_dealloc(tBTA_PAN_SCB* p_scb) {
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APPL_TRACE_DEBUG("bta_pan_scb_dealloc %d", bta_pan_scb_to_idx(p_scb));
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fixed_queue_free(p_scb->data_queue, NULL);
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memset(p_scb, 0, sizeof(tBTA_PAN_SCB));
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}
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/*******************************************************************************
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*
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* Function bta_pan_scb_to_idx
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*
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* Description Given a pointer to an scb, return its index.
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*
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*
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* Returns Index of scb.
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*
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******************************************************************************/
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uint8_t bta_pan_scb_to_idx(tBTA_PAN_SCB* p_scb) {
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return ((uint8_t)(p_scb - bta_pan_cb.scb)) + 1;
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}
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/*******************************************************************************
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*
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* Function bta_pan_scb_by_handle
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*
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* Description Find scb associated with handle.
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*
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*
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* Returns Pointer to scb or NULL if not found.
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*
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******************************************************************************/
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tBTA_PAN_SCB* bta_pan_scb_by_handle(uint16_t handle) {
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tBTA_PAN_SCB* p_scb = &bta_pan_cb.scb[0];
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uint8_t i;
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for (i = 0; i < BTA_PAN_NUM_CONN; i++, p_scb++) {
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if (p_scb->handle == handle) {
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return p_scb;
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;
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}
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}
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APPL_TRACE_WARNING("No scb for handle %d", handle);
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return NULL;
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}
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/*******************************************************************************
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*
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* Function bta_pan_hdl_event
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*
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* Description Data gateway main event handling function.
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*
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*
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* Returns void
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*
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******************************************************************************/
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bool bta_pan_hdl_event(BT_HDR_RIGID* p_msg) {
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tBTA_PAN_SCB* p_scb;
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bool freebuf = true;
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switch (p_msg->event) {
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/* handle enable event */
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case BTA_PAN_API_ENABLE_EVT:
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bta_pan_api_enable((tBTA_PAN_DATA*)p_msg);
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break;
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/* handle disable event */
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case BTA_PAN_API_DISABLE_EVT:
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bta_pan_api_disable((tBTA_PAN_DATA*)p_msg);
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break;
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/* handle set role event */
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case BTA_PAN_API_SET_ROLE_EVT:
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bta_pan_set_role((tBTA_PAN_DATA*)p_msg);
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break;
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/* handle open event */
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case BTA_PAN_API_OPEN_EVT:
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bta_pan_api_open((tBTA_PAN_DATA*)p_msg);
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break;
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/* events that require buffer not be released */
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case BTA_PAN_CI_RX_WRITEBUF_EVT:
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freebuf = false;
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p_scb = bta_pan_scb_by_handle(p_msg->layer_specific);
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if (p_scb != NULL) {
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bta_pan_sm_execute(p_scb, p_msg->event, (tBTA_PAN_DATA*)p_msg);
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}
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break;
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/* all other events */
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default:
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p_scb = bta_pan_scb_by_handle(p_msg->layer_specific);
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if (p_scb != NULL) {
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bta_pan_sm_execute(p_scb, p_msg->event, (tBTA_PAN_DATA*)p_msg);
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}
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break;
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}
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return freebuf;
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}
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#endif /* BTA_PAN_INCLUDED */
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