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

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 *

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 *  $Id$

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 *

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 *  Copyright (C) 2012  Florian Pose, Ingenieurgemeinschaft IgH

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 *

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 *  This file is part of the IgH EtherCAT master userspace library.

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 *

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 *  The IgH EtherCAT master userspace library is free software; you can

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 *  redistribute it and/or modify it under the terms of the GNU Lesser General

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 *  Public License as published by the Free Software Foundation; version 2.1

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 *  of the License.

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 *

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 *  The IgH EtherCAT master userspace library is distributed in the hope that

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 *  it will be useful, but WITHOUT ANY WARRANTY; without even the implied

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 *  warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

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 *  GNU Lesser General Public License for more details.

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 *

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

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 *  along with the IgH EtherCAT master userspace library. If not, see

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 *  <http://www.gnu.org/licenses/>.

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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 register request functions.

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 */

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

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#include <stdio.h>

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#include <string.h>

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#include "ioctl.h"

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#include "reg_request.h"

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#include "slave_config.h"

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#include "master.h"

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

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void ec_reg_request_clear(ec_reg_request_t *reg)

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{

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    if (reg->data) {

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        free(reg->data);

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    }

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}

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

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 * Application interface.

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

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uint8_t *ecrt_reg_request_data(ec_reg_request_t *reg)

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{

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    return reg->data;

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}

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

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ec_request_state_t ecrt_reg_request_state(ec_reg_request_t *reg)

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{

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    ec_ioctl_reg_request_t io;

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    int ret;

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    io.config_index = reg->config->index;

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    io.request_index = reg->index;

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    ret = ioctl(reg->config->master->fd, EC_IOCTL_REG_REQUEST_STATE, &io);

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    if (EC_IOCTL_IS_ERROR(ret)) {

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        fprintf(stderr, "Failed to get register request state: %s\n",

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                strerror(EC_IOCTL_ERRNO(ret)));

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        return EC_REQUEST_ERROR;

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    }

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    if (io.new_data) { // new data waiting to be copied

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        io.data = reg->data;

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        io.mem_size = reg->mem_size;

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        ret = ioctl(reg->config->master->fd,

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                EC_IOCTL_REG_REQUEST_DATA, &io);

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        if (EC_IOCTL_IS_ERROR(ret)) {

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            fprintf(stderr, "Failed to get register data: %s\n",

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                    strerror(EC_IOCTL_ERRNO(ret)));

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            return EC_REQUEST_ERROR;

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        }

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    }

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    return io.state;

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}

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

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void ecrt_reg_request_write(ec_reg_request_t *reg, uint16_t address,

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        size_t size)

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{

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    ec_ioctl_reg_request_t io;

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    int ret;

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    io.config_index = reg->config->index;

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    io.request_index = reg->index;

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    io.data = reg->data;

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    io.address = address;

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    io.transfer_size = size;

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    ret = ioctl(reg->config->master->fd, EC_IOCTL_REG_REQUEST_WRITE, &io);

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    if (EC_IOCTL_IS_ERROR(ret)) {

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        fprintf(stderr, "Failed to command an register write operation: %s\n",

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                strerror(EC_IOCTL_ERRNO(ret)));

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    }

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}

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

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void ecrt_reg_request_read(ec_reg_request_t *reg, uint16_t address,

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        size_t size)

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{

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    ec_ioctl_reg_request_t io;

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    int ret;

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    io.config_index = reg->config->index;

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    io.request_index = reg->index;

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    io.address = address;

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    io.transfer_size = size;

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    ret = ioctl(reg->config->master->fd, EC_IOCTL_REG_REQUEST_READ, &io);

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    if (EC_IOCTL_IS_ERROR(ret)) {

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        fprintf(stderr, "Failed to command an register read operation: %s\n",

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                strerror(EC_IOCTL_ERRNO(ret)));

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    }

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}

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