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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 XML device.

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*/

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/*****************************************************************************/

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#include <linux/module.h>

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#include "master.h"

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#include "xmldev.h"

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/*****************************************************************************/

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/** \cond */

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

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

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

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

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

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/*****************************************************************************/

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/** \cond */

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static struct file_operations fops = {

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    .owner   = THIS_MODULE,

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    .open    = ecxmldev_open,

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    .release = ecxmldev_release,

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    .read    = ecxmldev_read,

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    .write   = ecxmldev_write

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};

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/** \endcond */

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/*****************************************************************************/

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/**

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   XML device constructor.

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   \return 0 in case of success, else < 0

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*/

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

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

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                   dev_t dev_num /**< device number */

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                   )

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{

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    atomic_set(&xmldev->available, 1);

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

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    xmldev->cdev.owner = THIS_MODULE;

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    if (cdev_add(&xmldev->cdev,

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

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

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	return -1;

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    }

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    return 0;

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}

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/*****************************************************************************/

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/**

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   XML device destructor.

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*/

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

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{

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    cdev_del(&xmldev->cdev);

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}

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/*****************************************************************************/

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int ec_xmldev_request(ec_xmldev_t *xmldev,

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                      uint32_t vendor_id,

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                      uint32_t product_code

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                      )

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{

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    return 1;

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}

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/******************************************************************************

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 * file_operations

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 *****************************************************************************/

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

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{

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    ec_xmldev_t *xmldev;

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

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    if (!atomic_dec_and_test(&xmldev->available)) {

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        atomic_inc(&xmldev->available);

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        return -EBUSY;

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    }

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    filp->private_data = xmldev;

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    EC_DBG("File opened.\n");

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    return 0;

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}

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/*****************************************************************************/

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

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{

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

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    atomic_inc(&xmldev->available);

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    EC_DBG("File closed.\n");

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    return 0;

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}

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/*****************************************************************************/

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

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		      size_t count, loff_t *f_pos)

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{

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    size_t len = strlen(test_str);

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    if (*f_pos >= len) return 0;

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

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

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    *f_pos += count;

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    return count;

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}

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/*****************************************************************************/

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ssize_t ecxmldev_write(struct file *filp,

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		       const char __user *buf,

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		       size_t count,

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		       loff_t *f_pos)

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{

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    return -EFAULT;

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}

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/** \endcond */

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/*****************************************************************************/