fp@361: /******************************************************************************
fp@361:  *
fp@361:  *  $Id$
fp@361:  *
fp@361:  *  Copyright (C) 2006  Florian Pose, Ingenieurgemeinschaft IgH
fp@361:  *
fp@361:  *  This file is part of the IgH EtherCAT Master.
fp@361:  *
fp@361:  *  The IgH EtherCAT Master is free software; you can redistribute it
fp@361:  *  and/or modify it under the terms of the GNU General Public License
fp@361:  *  as published by the Free Software Foundation; either version 2 of the
fp@361:  *  License, or (at your option) any later version.
fp@361:  *
fp@361:  *  The IgH EtherCAT Master is distributed in the hope that it will be
fp@361:  *  useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
fp@361:  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
fp@361:  *  GNU General Public License for more details.
fp@361:  *
fp@361:  *  You should have received a copy of the GNU General Public License
fp@361:  *  along with the IgH EtherCAT Master; if not, write to the Free Software
fp@361:  *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
fp@361:  *
fp@361:  *  The right to use EtherCAT Technology is granted and comes free of
fp@361:  *  charge under condition of compatibility of product made by
fp@361:  *  Licensee. People intending to distribute/sell products based on the
fp@361:  *  code, have to sign an agreement to guarantee that products using
fp@361:  *  software based on IgH EtherCAT master stay compatible with the actual
fp@361:  *  EtherCAT specification (which are released themselves as an open
fp@361:  *  standard) as the (only) precondition to have the right to use EtherCAT
fp@361:  *  Technology, IP and trade marks.
fp@361:  *
fp@361:  *****************************************************************************/
fp@361: 
fp@361: /**
fp@361:    \file
fp@361:    EtherCAT XML device.
fp@361: */
fp@361: 
fp@361: /*****************************************************************************/
fp@361: 
fp@361: #include <linux/module.h>
fp@361: 
fp@361: #include "master.h"
fp@361: #include "xmldev.h"
fp@361: 
fp@361: /*****************************************************************************/
fp@361: 
fp@758: /** \cond */
fp@758: 
fp@361: static char *test_str = "hello world!\n";
fp@361: 
fp@361: int ecxmldev_open(struct inode *, struct file *);
fp@361: int ecxmldev_release(struct inode *, struct file *);
fp@361: ssize_t ecxmldev_read(struct file *, char __user *, size_t, loff_t *);
fp@361: ssize_t ecxmldev_write(struct file *, const char __user *, size_t, loff_t *);
fp@361: 
fp@361: /*****************************************************************************/
fp@361: 
fp@489: /** \cond */
fp@489: 
fp@361: static struct file_operations fops = {
fp@361:     .owner   = THIS_MODULE,
fp@361:     .open    = ecxmldev_open,
fp@361:     .release = ecxmldev_release,
fp@361:     .read    = ecxmldev_read,
fp@361:     .write   = ecxmldev_write
fp@361: };
fp@361: 
fp@489: /** \endcond */
fp@489: 
fp@361: /*****************************************************************************/
fp@361: 
fp@361: /**
fp@361:    XML device constructor.
fp@361:    \return 0 in case of success, else < 0
fp@361: */
fp@361: 
fp@361: int ec_xmldev_init(ec_xmldev_t *xmldev, /**< EtherCAT XML device */
fp@361:                    ec_master_t *master, /**< EtherCAT master */
fp@361:                    dev_t dev_num /**< device number */
fp@361:                    )
fp@361: {
fp@362:     atomic_set(&xmldev->available, 1);
fp@361:     cdev_init(&xmldev->cdev, &fops);
fp@361:     xmldev->cdev.owner = THIS_MODULE;
fp@361:     if (cdev_add(&xmldev->cdev,
fp@361: 		 MKDEV(MAJOR(dev_num), master->index), 1)) {
fp@361: 	EC_ERR("Failed to add character device!\n");
fp@361: 	return -1;
fp@361:     }
fp@361:     return 0;
fp@361: }
fp@361: 
fp@361: /*****************************************************************************/
fp@361: 
fp@361: /**
fp@361:    XML device destructor.
fp@361: */
fp@361: 
fp@361: void ec_xmldev_clear(ec_xmldev_t *xmldev /**< EtherCAT XML device */)
fp@361: {
fp@361:     cdev_del(&xmldev->cdev);
fp@361: }
fp@361: 
fp@361: /*****************************************************************************/
fp@361: 
fp@362: int ec_xmldev_request(ec_xmldev_t *xmldev,
fp@362:                       uint32_t vendor_id,
fp@362:                       uint32_t product_code
fp@362:                       )
fp@362: {
fp@362:     return 1;
fp@362: }
fp@362: 
fp@362: /******************************************************************************
fp@362:  * file_operations
fp@362:  *****************************************************************************/
fp@362: 
fp@361: int ecxmldev_open(struct inode *inode, struct file *filp)
fp@361: {
fp@361:     ec_xmldev_t *xmldev;
fp@361: 
fp@361:     xmldev = container_of(inode->i_cdev, ec_xmldev_t, cdev);
fp@362: 
fp@362:     if (!atomic_dec_and_test(&xmldev->available)) {
fp@362:         atomic_inc(&xmldev->available);
fp@362:         return -EBUSY;
fp@362:     }
fp@362: 
fp@361:     filp->private_data = xmldev;
fp@361: 
fp@361:     EC_DBG("File opened.\n");
fp@361: 
fp@361:     return 0;
fp@361: }
fp@361: 
fp@361: /*****************************************************************************/
fp@361: 
fp@361: int ecxmldev_release(struct inode *inode, struct file *filp)
fp@361: {
fp@362:     ec_xmldev_t *xmldev = container_of(inode->i_cdev, ec_xmldev_t, cdev);
fp@362:     atomic_inc(&xmldev->available);
fp@361:     EC_DBG("File closed.\n");
fp@361:     return 0;
fp@361: }
fp@361: 
fp@361: /*****************************************************************************/
fp@361: 
fp@361: ssize_t ecxmldev_read(struct file *filp, char __user *buf,
fp@361: 		      size_t count, loff_t *f_pos)
fp@361: {
fp@361:     size_t len = strlen(test_str);
fp@361: 
fp@361:     if (*f_pos >= len) return 0;
fp@361:     if (*f_pos + count > len) count = len - *f_pos;
fp@361: 
fp@361:     if (copy_to_user(buf, test_str + *f_pos, count)) return -EFAULT;
fp@361: 
fp@361:     *f_pos += count;
fp@361: 
fp@361:     return count;
fp@361: }
fp@361: 
fp@361: /*****************************************************************************/
fp@361: 
fp@361: ssize_t ecxmldev_write(struct file *filp,
fp@361: 		       const char __user *buf,
fp@361: 		       size_t count,
fp@361: 		       loff_t *f_pos)
fp@361: {
fp@361:     return -EFAULT;
fp@361: }
fp@361: 
fp@758: /** \endcond */
fp@758: 
fp@361: /*****************************************************************************/