/******************************************************************************
*
* Copyright 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 (BTA_PAN_INCLUDED == TRUE)
#include <string.h>
#include "bt_common.h"
#include "bta_api.h"
#include "bta_pan_api.h"
#include "bta_pan_int.h"
#include "bta_sys.h"
#include "osi/include/osi.h"
#include "pan_api.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,
BTA_PAN_MAX_ACTIONS
};
/* 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_t 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_t 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_t 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_t (*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 */
tBTA_PAN_CB bta_pan_cb;
/*******************************************************************************
*
* 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_t event,
tBTA_PAN_DATA* p_data) {
tBTA_PAN_ST_TBL state_table;
uint8_t 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++) {
action = state_table[event][i];
CHECK(action < BTA_PAN_MAX_ACTIONS);
if (action == BTA_PAN_IGNORE) continue;
(*bta_pan_action[action])(p_scb, p_data);
}
}
/*******************************************************************************
*
* 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(UNUSED_ATTR tBTA_PAN_DATA* 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 bta_pan;
/* allocate an scb */
p_scb = bta_pan_scb_alloc();
if (p_scb != NULL) {
bta_pan_open(p_scb, p_data);
} else {
bta_pan.open.bd_addr = p_data->api_open.bd_addr;
bta_pan.open.status = BTA_PAN_FAIL;
bta_pan_cb.p_cback(BTA_PAN_OPEN_EVT, &bta_pan);
}
}
/*******************************************************************************
*
* 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_t bta_pan_scb_to_idx(tBTA_PAN_SCB* p_scb) {
return ((uint8_t)(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_t handle) {
tBTA_PAN_SCB* p_scb = &bta_pan_cb.scb[0];
uint8_t 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
*
******************************************************************************/
bool bta_pan_hdl_event(BT_HDR* p_msg) {
tBTA_PAN_SCB* p_scb;
bool 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;
p_scb = bta_pan_scb_by_handle(p_msg->layer_specific);
if (p_scb != NULL) {
bta_pan_sm_execute(p_scb, p_msg->event, (tBTA_PAN_DATA*)p_msg);
}
break;
/* all other events */
default:
p_scb = bta_pan_scb_by_handle(p_msg->layer_specific);
if (p_scb != NULL) {
bta_pan_sm_execute(p_scb, p_msg->event, (tBTA_PAN_DATA*)p_msg);
}
break;
}
return freebuf;
}
#endif /* BTA_PAN_INCLUDED */