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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.

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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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 * Register request functions.

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 */

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

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#include <linux/module.h>

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#include <linux/jiffies.h>

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#include <linux/slab.h>

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#include "reg_request.h"

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

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/** Register request constructor.

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 *

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 * \return Zero on success, otherwise a negative error code.

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 */

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int ec_reg_request_init(

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        ec_reg_request_t *reg, /**< Register request. */

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        size_t size /**< Memory size. */

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        )

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{

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    if (!(reg->data = (uint8_t *) kmalloc(size, GFP_KERNEL))) {

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        EC_ERR("Failed to allocate %zu bytes of register memory.\n", size);

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        return -ENOMEM;

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    }

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    INIT_LIST_HEAD(&reg->list);

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    reg->mem_size = size;

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    memset(reg->data, 0x00, size);

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    reg->dir = EC_DIR_INVALID;

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    reg->address = 0;

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    reg->transfer_size = 0;

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    reg->state = EC_INT_REQUEST_INIT;

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    reg->ring_position = 0;

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    return 0;

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}

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

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/** Register request destructor.

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 */

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void ec_reg_request_clear(

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        ec_reg_request_t *reg /**< Register request. */

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        )

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{

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    if (reg->data) {

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        kfree(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(const ec_reg_request_t *reg)

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{

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   return ec_request_state_translation_table[reg->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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    reg->dir = EC_DIR_OUTPUT;

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    reg->address = address;

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    reg->transfer_size = min(size, reg->mem_size);

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    reg->state = EC_INT_REQUEST_QUEUED;

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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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    reg->dir = EC_DIR_INPUT;

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    reg->address = address;

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    reg->transfer_size = min(size, reg->mem_size);

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    reg->state = EC_INT_REQUEST_QUEUED;

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}

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

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/** \cond */

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EXPORT_SYMBOL(ecrt_reg_request_data);

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EXPORT_SYMBOL(ecrt_reg_request_state);

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EXPORT_SYMBOL(ecrt_reg_request_write);

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EXPORT_SYMBOL(ecrt_reg_request_read);

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/** \endcond */

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