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1 /****************************************************************************** |
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2 * |
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3 * $Id$ |
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4 * |
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5 * Copyright (C) 2006 Florian Pose, Ingenieurgemeinschaft IgH |
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6 * |
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7 * This file is part of the IgH EtherCAT Master. |
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8 * |
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9 * The IgH EtherCAT Master is free software; you can redistribute it |
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10 * and/or modify it under the terms of the GNU General Public License |
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11 * as published by the Free Software Foundation; either version 2 of the |
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12 * License, or (at your option) any later version. |
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13 * |
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14 * The IgH EtherCAT Master is distributed in the hope that it will be |
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15 * useful, but WITHOUT ANY WARRANTY; without even the implied warranty of |
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16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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17 * GNU General Public License for more details. |
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18 * |
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19 * You should have received a copy of the GNU General Public License |
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20 * along with the IgH EtherCAT Master; if not, write to the Free Software |
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21 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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22 * |
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23 * The right to use EtherCAT Technology is granted and comes free of |
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24 * charge under condition of compatibility of product made by |
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25 * Licensee. People intending to distribute/sell products based on the |
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26 * code, have to sign an agreement to guarantee that products using |
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27 * software based on IgH EtherCAT master stay compatible with the actual |
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28 * EtherCAT specification (which are released themselves as an open |
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29 * standard) as the (only) precondition to have the right to use EtherCAT |
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30 * Technology, IP and trade marks. |
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31 * |
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32 *****************************************************************************/ |
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33 |
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34 /** |
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35 \file |
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36 EtherCAT process data object methods. |
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37 */ |
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38 |
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39 /*****************************************************************************/ |
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40 |
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41 #include <linux/slab.h> |
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42 |
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43 #include "pdo.h" |
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44 |
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45 /*****************************************************************************/ |
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46 |
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47 /** |
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48 * PDO constructor. |
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49 */ |
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50 |
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51 void ec_pdo_init(ec_pdo_t *pdo /**< EtherCAT PDO */) |
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52 { |
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53 pdo->name = NULL; |
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54 INIT_LIST_HEAD(&pdo->entries); |
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55 } |
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56 |
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57 /*****************************************************************************/ |
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58 |
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59 /** |
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60 * PDO destructor. |
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61 */ |
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62 |
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63 void ec_pdo_clear(ec_pdo_t *pdo /**< EtherCAT PDO */) |
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64 { |
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65 ec_pdo_entry_t *entry, *next; |
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66 |
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67 // free all PDO entries |
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68 list_for_each_entry_safe(entry, next, &pdo->entries, list) { |
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69 list_del(&entry->list); |
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70 kfree(entry); |
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71 } |
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72 } |
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73 |
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74 /*****************************************************************************/ |
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75 |
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76 /** |
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77 * Makes a deep copy of a PDO. |
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78 */ |
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79 |
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80 int ec_pdo_copy(ec_pdo_t *pdo, const ec_pdo_t *other_pdo) |
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81 { |
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82 ec_pdo_entry_t *entry, *other_entry, *next; |
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83 |
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84 // make flat copy |
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85 *pdo = *other_pdo; |
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86 |
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87 INIT_LIST_HEAD(&pdo->entries); |
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88 list_for_each_entry(other_entry, &other_pdo->entries, list) { |
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89 if (!(entry = (ec_pdo_entry_t *) |
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90 kmalloc(sizeof(ec_pdo_entry_t), GFP_KERNEL))) { |
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91 EC_ERR("Failed to allocate memory for PDO entry copy.\n"); |
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92 goto out_free; |
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93 } |
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94 |
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95 *entry = *other_entry; // flat copy is sufficient |
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96 list_add_tail(&entry->list, &pdo->entries); |
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97 } |
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98 |
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99 return 0; |
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100 |
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101 out_free: |
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102 list_for_each_entry_safe(entry, next, &pdo->entries, list) { |
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103 list_del(&entry->list); |
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104 kfree(entry); |
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105 } |
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106 return -1; |
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107 } |
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108 |
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109 /*****************************************************************************/ |