/******************************************************************************
 *
 *  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 <string.h>
#include "bta_api.h"
#include "bta_sys.h"
#include "gki.h"
#include "pan_api.h"
#include "bta_pan_api.h"
#include "bta_pan_int.h"
#include "bd.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));
    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 */