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

     2  *

     3  *  $Id$

     4  *

     5  *  Copyright (C) 2012  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 and/or

    10  *  modify it under the terms of the GNU General Public License version 2, as

    11  *  published by the Free Software Foundation.

    12  *

    13  *  The IgH EtherCAT Master is distributed in the hope that it will be useful,

    14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of

    15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General

    16  *  Public License for more details.

    17  *

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

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

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

    21  *

    22  *  ---

    23  *

    24  *  The license mentioned above concerns the source code only. Using the

    25  *  EtherCAT technology and brand is only permitted in compliance with the

    26  *  industrial property and similar rights of Beckhoff Automation GmbH.

    27  *

    28  *****************************************************************************/

    29 

    30 /** \file

    31  * Register request functions.

    32  */

    33 

    34 /*****************************************************************************/

    35 

    36 #include <linux/module.h>

    37 #include <linux/jiffies.h>

    38 #include <linux/slab.h>

    39 

    40 #include "reg_request.h"

    41 

    42 /*****************************************************************************/

    43 

    44 void ec_reg_request_clear_data(ec_reg_request_t *);

    45 

    46 /*****************************************************************************/

    47 

    48 /** Register request constructor.

    49  */

    50 int ec_reg_request_init(

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

    52         size_t size /**< Memory size. */

    53         )

    54 {

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

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

    57         return -ENOMEM;

    58     }

    59 

    60     INIT_LIST_HEAD(&reg->list);

    61     reg->mem_size = size;

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

    63     reg->dir = EC_DIR_INVALID;

    64     reg->address = 0;

    65     reg->transfer_size = 0;

    66     reg->state = EC_INT_REQUEST_INIT;

    67     return 0;

    68 }

    69 

    70 /*****************************************************************************/

    71 

    72 /** Register request destructor.

    73  */

    74 void ec_reg_request_clear(

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

    76         )

    77 {

    78     if (reg->data) {

    79         kfree(reg->data);

    80     }

    81 }

    82 

    83 /*****************************************************************************

    84  * Application interface.

    85  ****************************************************************************/

    86 

    87 uint8_t *ecrt_reg_request_data(ec_reg_request_t *reg)

    88 {

    89     return reg->data;

    90 }

    91 

    92 /*****************************************************************************/

    93 

    94 ec_request_state_t ecrt_reg_request_state(const ec_reg_request_t *reg)

    95 {

    96    return ec_request_state_translation_table[reg->state];

    97 }

    98 

    99 /*****************************************************************************/

   100 

   101 void ecrt_reg_request_write(ec_reg_request_t *reg, uint16_t address,

   102         size_t size)

   103 {

   104     reg->dir = EC_DIR_OUTPUT;

   105     reg->address = address;

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

   107     reg->state = EC_INT_REQUEST_QUEUED;

   108 }

   109 

   110 /*****************************************************************************/

   111 

   112 void ecrt_reg_request_read(ec_reg_request_t *reg, uint16_t address,

   113         size_t size)

   114 {

   115     reg->dir = EC_DIR_INPUT;

   116     reg->address = address;

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

   118     reg->state = EC_INT_REQUEST_QUEUED;

   119 }

   120 

   121 /*****************************************************************************/

   122 

   123 /** \cond */

   124 

   125 EXPORT_SYMBOL(ecrt_reg_request_data);

   126 EXPORT_SYMBOL(ecrt_reg_request_state);

   127 EXPORT_SYMBOL(ecrt_reg_request_write);

   128 EXPORT_SYMBOL(ecrt_reg_request_read);

   129 

   130 /** \endcond */

   131 

   132 /*****************************************************************************/