1 /******************************************************************************

     2  *

     3  *  $Id$

     4  *

     5  *  Copyright (C) 2006  Florian Pose, Ingenieurgemeinschaft IgH

     6  *

     7  *  This file is part of the IgH EtherCAT Master.

     8  *

     9  *  The IgH EtherCAT Master is free software; you can redistribute it

    10  *  and/or modify it under the terms of the GNU General Public License

    11  *  as published by the Free Software Foundation; either version 2 of the

    12  *  License, or (at your option) any later version.

    13  *

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

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

    16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

    17  *  GNU General Public License for more details.

    18  *

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

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

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

    22  *

    23  *  The right to use EtherCAT Technology is granted and comes free of

    24  *  charge under condition of compatibility of product made by

    25  *  Licensee. People intending to distribute/sell products based on the

    26  *  code, have to sign an agreement to guarantee that products using

    27  *  software based on IgH EtherCAT master stay compatible with the actual

    28  *  EtherCAT specification (which are released themselves as an open

    29  *  standard) as the (only) precondition to have the right to use EtherCAT

    30  *  Technology, IP and trade marks.

    31  *

    32  *****************************************************************************/

    33 

    34 /**

    35    \file

    36    EtherCAT process data object entry methods.

    37 */

    38 

    39 /*****************************************************************************/

    40 

    41 #include <linux/slab.h>

    42 

    43 #include "pdo_entry.h"

    44 

    45 /*****************************************************************************/

    46 

    47 /** Pdo entry constructor.

    48  */

    49 void ec_pdo_entry_init(

    50         ec_pdo_entry_t *entry /**< Pdo entry. */

    51         )

    52 {

    53     entry->name = NULL;

    54 }

    55 

    56 /*****************************************************************************/

    57 

    58 /** Pdo entry copy constructor.

    59  */

    60 int ec_pdo_entry_init_copy(

    61         ec_pdo_entry_t *entry, /**< Pdo entry. */

    62         const ec_pdo_entry_t *other /**< Pdo entry to copy from. */

    63         )

    64 {

    65     entry->index = other->index;

    66     entry->subindex = other->subindex;

    67     entry->name = NULL;

    68     entry->bit_length = other->bit_length;

    69 

    70     if (ec_pdo_entry_set_name(entry, other->name))

    71         return -1;

    72 

    73     return 0;

    74 }

    75 

    76 /*****************************************************************************/

    77 

    78 /** Pdo entry destructor.

    79  */

    80 void ec_pdo_entry_clear(ec_pdo_entry_t *entry /**< Pdo entry. */)

    81 {

    82     if (entry->name)

    83         kfree(entry->name);

    84 }

    85 

    86 /*****************************************************************************/

    87 

    88 /** Set Pdo entry name.

    89  */

    90 int ec_pdo_entry_set_name(

    91         ec_pdo_entry_t *entry, /**< Pdo entry. */

    92         const char *name /**< New name. */

    93         )

    94 {

    95     unsigned int len;

    96 

    97     if (entry->name)

    98         kfree(entry->name);

    99 

   100     if (name && (len = strlen(name))) {

   101         if (!(entry->name = (char *) kmalloc(len + 1, GFP_KERNEL))) {

   102             EC_ERR("Failed to allocate Pdo entry name.\n");

   103             return -1;

   104         }

   105         memcpy(entry->name, name, len + 1);

   106     } else {

   107         entry->name = NULL;

   108     }

   109 

   110     return 0;

   111 }

   112 

   113 /*****************************************************************************/

   114 

   115 /** Compares two Pdo entries.

   116  *

   117  * \retval 1 The entries are equal.

   118  * \retval 0 The entries differ.

   119  */

   120 int ec_pdo_entry_equal(

   121         const ec_pdo_entry_t *entry1, /**< First Pdo entry. */

   122         const ec_pdo_entry_t *entry2 /**< Second Pdo entry. */

   123         )

   124 {

   125     return entry1->index == entry2->index

   126         && entry1->subindex == entry2->subindex

   127         && entry1->bit_length == entry2->bit_length;

   128 }

   129 

   130 /*****************************************************************************/