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 XML device.

    37 */

    38 

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

    40 

    41 #include <linux/module.h>

    42 

    43 #include "master.h"

    44 #include "xmldev.h"

    45 

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

    47 

    48 static char *test_str = "hello world!\n";

    49 

    50 int ecxmldev_open(struct inode *, struct file *);

    51 int ecxmldev_release(struct inode *, struct file *);

    52 ssize_t ecxmldev_read(struct file *, char __user *, size_t, loff_t *);

    53 ssize_t ecxmldev_write(struct file *, const char __user *, size_t, loff_t *);

    54 

    55 /*****************************************************************************/

    56 

    57 static struct file_operations fops = {

    58     .owner   = THIS_MODULE,

    59     .open    = ecxmldev_open,

    60     .release = ecxmldev_release,

    61     .read    = ecxmldev_read,

    62     .write   = ecxmldev_write

    63 };

    64 

    65 /*****************************************************************************/

    66 

    67 /**

    68    XML device constructor.

    69    \return 0 in case of success, else < 0

    70 */

    71 

    72 int ec_xmldev_init(ec_xmldev_t *xmldev, /**< EtherCAT XML device */

    73                    ec_master_t *master, /**< EtherCAT master */

    74                    dev_t dev_num /**< device number */

    75                    )

    76 {

    77     cdev_init(&xmldev->cdev, &fops);

    78     xmldev->cdev.owner = THIS_MODULE;

    79     if (cdev_add(&xmldev->cdev,

    80 		 MKDEV(MAJOR(dev_num), master->index), 1)) {

    81 	EC_ERR("Failed to add character device!\n");

    82 	return -1;

    83     }

    84     return 0;

    85 }

    86 

    87 /*****************************************************************************/

    88 

    89 /**

    90    XML device destructor.

    91 */

    92 

    93 void ec_xmldev_clear(ec_xmldev_t *xmldev /**< EtherCAT XML device */)

    94 {

    95     cdev_del(&xmldev->cdev);

    96 }

    97 

    98 /*****************************************************************************/

    99 

   100 int ecxmldev_open(struct inode *inode, struct file *filp)

   101 {

   102     ec_xmldev_t *xmldev;

   103 

   104     xmldev = container_of(inode->i_cdev, ec_xmldev_t, cdev);

   105     filp->private_data = xmldev;

   106 

   107     EC_DBG("File opened.\n");

   108 

   109     return 0;

   110 }

   111 

   112 /*****************************************************************************/

   113 

   114 int ecxmldev_release(struct inode *inode, struct file *filp)

   115 {

   116     EC_DBG("File closed.\n");

   117     return 0;

   118 }

   119 

   120 /*****************************************************************************/

   121 

   122 ssize_t ecxmldev_read(struct file *filp, char __user *buf,

   123 		      size_t count, loff_t *f_pos)

   124 {

   125     size_t len = strlen(test_str);

   126 

   127     if (*f_pos >= len) return 0;

   128     if (*f_pos + count > len) count = len - *f_pos;

   129 

   130     if (copy_to_user(buf, test_str + *f_pos, count)) return -EFAULT;

   131 

   132     *f_pos += count;

   133 

   134     return count;

   135 }

   136 

   137 /*****************************************************************************/

   138 

   139 ssize_t ecxmldev_write(struct file *filp,

   140 		       const char __user *buf,

   141 		       size_t count,

   142 		       loff_t *f_pos)

   143 {

   144     return -EFAULT;

   145 }

   146 

   147 /*****************************************************************************/