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/******************************************************************************

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 *

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 *  $Id$

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 *

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 *  Copyright (C) 2006-2012  Florian Pose, Ingenieurgemeinschaft IgH

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 *

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 *  This file is part of the IgH EtherCAT Master.

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 *

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 *  The IgH EtherCAT Master is free software; you can redistribute it and/or

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 *  modify it under the terms of the GNU General Public License version 2, as

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 *  published by the Free Software Foundation.

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 *

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 *  The IgH EtherCAT Master is distributed in the hope that it will be useful,

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 *  but WITHOUT ANY WARRANTY; without even the implied warranty of

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 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General

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 *  Public License for more details.

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 *

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 *  You should have received a copy of the GNU General Public License along

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 *  with the IgH EtherCAT Master; if not, write to the Free Software

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 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

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 *

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 *  ---

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 *

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 *  The license mentioned above concerns the source code only. Using the

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 *  EtherCAT technology and brand is only permitted in compliance with the

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 *  industrial property and similar rights of Beckhoff Automation GmbH.

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 *

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 *****************************************************************************/

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/** \file

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 * EtherCAT slave (SDO) state machine.

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 */

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/*****************************************************************************/

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#include "globals.h"

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#include "master.h"

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#include "mailbox.h"

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#include "slave_config.h"

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#include "fsm_slave.h"

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/*****************************************************************************/

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/*****************************************************************************/

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/** Constructor.

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 */

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void ec_fsm_slave_init(

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        ec_fsm_slave_t *fsm, /**< Slave state machine. */

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        )

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{

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    fsm->slave = slave;

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    fsm->state = ec_fsm_slave_state_idle;

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}

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/*****************************************************************************/

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/** Destructor.

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 */

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void ec_fsm_slave_clear(

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        ec_fsm_slave_t *fsm /**< Master state machine. */

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        )

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{

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    // clear sub-state machines

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    ec_fsm_coe_clear(&fsm->fsm_coe);

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    ec_fsm_foe_clear(&fsm->fsm_foe);

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    ec_fsm_soe_clear(&fsm->fsm_soe);

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}

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/*****************************************************************************/

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/** Executes the current state of the state machine.

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 *

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}

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/*****************************************************************************/

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/** Sets the current state of the state machine to READY

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 */

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        ec_fsm_slave_t *fsm /**< Slave state machine. */

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        )

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{

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    if (fsm->state == ec_fsm_slave_state_idle) {

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        EC_SLAVE_DBG(fsm->slave, 1, "Ready for requests.\n");

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        fsm->state = ec_fsm_slave_state_ready;

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    }

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}

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/******************************************************************************

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 * Slave state machine

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 *****************************************************************************/

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/** Slave state: IDLE.

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 */

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void ec_fsm_slave_state_idle(

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        )

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{

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    // do nothing

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}

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/*****************************************************************************/

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/** Slave state: READY.

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 */

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void ec_fsm_slave_state_ready(

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        )

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{

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    // Check for pending external SDO requests

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        return;

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    }

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    // Check for pending external register requests

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        return;

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    }

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    // Check for pending FoE requests

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        return;

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    }

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    // Check for pending SoE requests

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        return;

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    }

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}

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/*****************************************************************************/

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/** Check for pending SDO requests and process one.

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 *

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 * \return non-zero, if an SDO request is processed.

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 */

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int ec_fsm_slave_action_process_sdo(

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        )

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{

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    ec_slave_t *slave = fsm->slave;

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    ec_sdo_request_t *request;

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    if (list_empty(&slave->sdo_requests)) {

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        return 0;

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    }

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    // take the first request to be processed

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    request = list_entry(slave->sdo_requests.next, ec_sdo_request_t, list);

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    list_del_init(&request->list); // dequeue

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    if (slave->current_state & EC_SLAVE_STATE_ACK_ERR) {

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        EC_SLAVE_WARN(slave, "Aborting SDO request,"

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                " slave has error flag set.\n");

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        request->state = EC_INT_REQUEST_FAILURE;

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        fsm->state = ec_fsm_slave_state_idle;

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        return 1;

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    }

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    if (slave->current_state == EC_SLAVE_STATE_INIT) {

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        EC_SLAVE_WARN(slave, "Aborting SDO request, slave is in INIT.\n");

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        request->state = EC_INT_REQUEST_FAILURE;

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        fsm->state = ec_fsm_slave_state_idle;

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        return 1;

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    }

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    request->state = EC_INT_REQUEST_BUSY;

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    // Found pending SDO request. Execute it!

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    EC_SLAVE_DBG(slave, 1, "Processing SDO request...\n");

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    // Start SDO transfer

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    fsm->state = ec_fsm_slave_state_sdo_request;

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    ec_fsm_coe_transfer(&fsm->fsm_coe, slave, request);

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    return 1;

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}

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/*****************************************************************************/

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/** Slave state: SDO_REQUEST.

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 */

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void ec_fsm_slave_state_sdo_request(

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        )

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{

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    ec_slave_t *slave = fsm->slave;

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    ec_sdo_request_t *request = fsm->sdo_request;

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        return;

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    }

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    if (!ec_fsm_coe_success(&fsm->fsm_coe)) {

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        EC_SLAVE_ERR(slave, "Failed to process SDO request.\n");

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        request->state = EC_INT_REQUEST_FAILURE;

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        fsm->sdo_request = NULL;

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        fsm->state = ec_fsm_slave_state_ready;

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        return;

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    }

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    EC_SLAVE_DBG(slave, 1, "Finished SDO request.\n");

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    // SDO request finished

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    request->state = EC_INT_REQUEST_SUCCESS;

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    fsm->sdo_request = NULL;

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    fsm->state = ec_fsm_slave_state_ready;

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}

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/*****************************************************************************/

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/** Check for pending register requests and process one.

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 *

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 * \return non-zero, if a register request is processed.

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 */

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int ec_fsm_slave_action_process_reg(

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        )

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{

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    ec_slave_t *slave = fsm->slave;

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    ec_reg_request_t *reg;

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    fsm->reg_request = NULL;

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    if (slave->config) {

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        // search the first internal register request to be processed

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        list_for_each_entry(reg, &slave->config->reg_requests, list) {

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            if (reg->state == EC_INT_REQUEST_QUEUED) {

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                fsm->reg_request = reg;

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                break;

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            }

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        }

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    }

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    if (!fsm->reg_request && !list_empty(&slave->reg_requests)) {

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        // take the first external request to be processed

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        fsm->reg_request =

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            list_entry(slave->reg_requests.next, ec_reg_request_t, list);

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        list_del_init(&fsm->reg_request->list); // dequeue

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    }

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    if (!fsm->reg_request) { // no register request to process

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        return 0;

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    }

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    if (slave->current_state & EC_SLAVE_STATE_ACK_ERR) {

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        EC_SLAVE_WARN(slave, "Aborting register request,"

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                " slave has error flag set.\n");

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        fsm->reg_request->state = EC_INT_REQUEST_FAILURE;

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        fsm->reg_request = NULL;

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        fsm->state = ec_fsm_slave_state_idle;

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        return 1;

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    }

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    // Found pending register request. Execute it!

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    EC_SLAVE_DBG(slave, 1, "Processing register request...\n");

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    fsm->reg_request->state = EC_INT_REQUEST_BUSY;

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    // Start register access

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    if (fsm->reg_request->dir == EC_DIR_INPUT) {

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                fsm->reg_request->address, fsm->reg_request->transfer_size);

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    } else {

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                fsm->reg_request->address, fsm->reg_request->transfer_size);

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                fsm->reg_request->transfer_size);

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    }

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    fsm->state = ec_fsm_slave_state_reg_request;

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    return 1;

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}

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/*****************************************************************************/

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/** Slave state: Register request.

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 */

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void ec_fsm_slave_state_reg_request(

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        )

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{

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    ec_slave_t *slave = fsm->slave;

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    ec_reg_request_t *reg = fsm->reg_request;

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    if (!reg) {

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        // configuration was cleared in the meantime

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        fsm->state = ec_fsm_slave_state_ready;

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        return;

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    }

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    if (fsm->datagram->state != EC_DATAGRAM_RECEIVED) {

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        EC_SLAVE_ERR(slave, "Failed to receive register"

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                " request datagram: ");

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        ec_datagram_print_state(fsm->datagram);

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        reg->state = EC_INT_REQUEST_FAILURE;

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        fsm->reg_request = NULL;

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        fsm->state = ec_fsm_slave_state_ready;

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        return;

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    }

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    if (fsm->datagram->working_counter == 1) {

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        if (reg->dir == EC_DIR_INPUT) { // read request

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            memcpy(reg->data, fsm->datagram->data, reg->transfer_size);

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        }

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        reg->state = EC_INT_REQUEST_SUCCESS;

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        EC_SLAVE_DBG(slave, 1, "Register request successful.\n");

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    } else {

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        reg->state = EC_INT_REQUEST_FAILURE;

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        ec_datagram_print_state(fsm->datagram);

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        EC_SLAVE_ERR(slave, "Register request failed"

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                " (working counter is %u).\n",

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                fsm->datagram->working_counter);

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    }

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    fsm->reg_request = NULL;

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    fsm->state = ec_fsm_slave_state_ready;

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}

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/*****************************************************************************/

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/** Check for pending FoE requests and process one.

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 *

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 * \return non-zero, if an FoE request is processed.

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 */

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int ec_fsm_slave_action_process_foe(

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        )

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{

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    ec_slave_t *slave = fsm->slave;

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    ec_foe_request_t *request;

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    if (list_empty(&slave->foe_requests)) {

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        return 0;

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    }

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    // take the first request to be processed

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    request = list_entry(slave->foe_requests.next, ec_foe_request_t, list);

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    list_del_init(&request->list); // dequeue

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    if (slave->current_state & EC_SLAVE_STATE_ACK_ERR) {

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        EC_SLAVE_WARN(slave, "Aborting FoE request,"

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                " slave has error flag set.\n");

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        request->state = EC_INT_REQUEST_FAILURE;

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        fsm->state = ec_fsm_slave_state_idle;

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        return 1;

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    }

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    request->state = EC_INT_REQUEST_BUSY;

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    EC_SLAVE_DBG(slave, 1, "Processing FoE request.\n");

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    fsm->state = ec_fsm_slave_state_foe_request;

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    ec_fsm_foe_transfer(&fsm->fsm_foe, slave, request);

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    return 1;

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}

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/*****************************************************************************/

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/** Slave state: FOE REQUEST.

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 */

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void ec_fsm_slave_state_foe_request(

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        )

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{

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    ec_slave_t *slave = fsm->slave;

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    ec_foe_request_t *request = fsm->foe_request;

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        return;

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    }

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    if (!ec_fsm_foe_success(&fsm->fsm_foe)) {

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        EC_SLAVE_ERR(slave, "Failed to handle FoE request.\n");

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        request->state = EC_INT_REQUEST_FAILURE;

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        fsm->foe_request = NULL;

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        fsm->state = ec_fsm_slave_state_ready;

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        return;

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    }

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    // finished transferring FoE

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    EC_SLAVE_DBG(slave, 1, "Successfully transferred %zu bytes of FoE"

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            " data.\n", request->data_size);

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    request->state = EC_INT_REQUEST_SUCCESS;

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    fsm->foe_request = NULL;

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    fsm->state = ec_fsm_slave_state_ready;

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}

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