master/pdo_entry.c
author Florian Pose <fp@igh-essen.com>
Wed, 01 Oct 2008 11:53:22 +0000
changeset 1240 982eb5bee593
parent 1186 ff481f097c97
child 1313 ed15eef57d5c
child 1685 399ef727bf62
permissions -rw-r--r--
Removed watchdog debugging output.
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/******************************************************************************
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 *
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 *  $Id$
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 *
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 *  Copyright (C) 2006  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
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 *  and/or modify it under the terms of the GNU General Public License
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 *  as published by the Free Software Foundation; either version 2 of the
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 *  License, or (at your option) any later version.
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 *
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 *  The IgH EtherCAT Master is distributed in the hope that it will be
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 *  useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
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 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 *  GNU General 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
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 *  along 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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 *  The right to use EtherCAT Technology is granted and comes free of
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 *  charge under condition of compatibility of product made by
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 *  Licensee. People intending to distribute/sell products based on the
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 *  code, have to sign an agreement to guarantee that products using
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 *  software based on IgH EtherCAT master stay compatible with the actual
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 *  EtherCAT specification (which are released themselves as an open
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 *  standard) as the (only) precondition to have the right to use EtherCAT
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 *  Technology, IP and trade marks.
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 *
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 *****************************************************************************/
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/**
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   \file
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   EtherCAT process data object entry methods.
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*/
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/*****************************************************************************/
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#include <linux/slab.h>
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#include "pdo_entry.h"
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/*****************************************************************************/
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/** Pdo entry constructor.
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 */
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void ec_pdo_entry_init(
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        ec_pdo_entry_t *entry /**< Pdo entry. */
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        )
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{
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    entry->name = NULL;
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}
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/*****************************************************************************/
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/** Pdo entry copy constructor.
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 */
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int ec_pdo_entry_init_copy(
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        ec_pdo_entry_t *entry, /**< Pdo entry. */
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        const ec_pdo_entry_t *other /**< Pdo entry to copy from. */
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        )
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{
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    entry->index = other->index;
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    entry->subindex = other->subindex;
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    entry->name = NULL;
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    entry->bit_length = other->bit_length;
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    if (ec_pdo_entry_set_name(entry, other->name))
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        return -1;
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    return 0;
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}
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/*****************************************************************************/
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/** Pdo entry destructor.
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 */
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void ec_pdo_entry_clear(ec_pdo_entry_t *entry /**< Pdo entry. */)
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{
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    if (entry->name)
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        kfree(entry->name);
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}
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/*****************************************************************************/
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/** Set Pdo entry name.
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 */
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int ec_pdo_entry_set_name(
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        ec_pdo_entry_t *entry, /**< Pdo entry. */
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        const char *name /**< New name. */
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        )
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{
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    unsigned int len;
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    if (entry->name && name && !strcmp(entry->name, name))
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        return 0;
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    if (entry->name)
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        kfree(entry->name);
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    if (name && (len = strlen(name))) {
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        if (!(entry->name = (char *) kmalloc(len + 1, GFP_KERNEL))) {
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            EC_ERR("Failed to allocate Pdo entry name.\n");
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            return -1;
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        }
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        memcpy(entry->name, name, len + 1);
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    } else {
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        entry->name = NULL;
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    }
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    return 0;
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}
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/*****************************************************************************/
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/** Compares two Pdo entries.
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 *
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 * \retval 1 The entries are equal.
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 * \retval 0 The entries differ.
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 */
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int ec_pdo_entry_equal(
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        const ec_pdo_entry_t *entry1, /**< First Pdo entry. */
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        const ec_pdo_entry_t *entry2 /**< Second Pdo entry. */
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        )
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{
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    return entry1->index == entry2->index
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        && entry1->subindex == entry2->subindex
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        && entry1->bit_length == entry2->bit_length;
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}
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/*****************************************************************************/