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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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   CANopen Sdo functions.

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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 "sdo.h"

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

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ssize_t ec_show_sdo_attribute(struct kobject *, struct attribute *, char *);

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void ec_sdo_clear(struct kobject *);

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

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/** \cond */

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EC_SYSFS_READ_ATTR(info);

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static struct attribute *sdo_def_attrs[] = {

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    &attr_info,

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    NULL,

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};

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static struct sysfs_ops sdo_sysfs_ops = {

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    .show = &ec_show_sdo_attribute,

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    .store = NULL

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};

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static struct kobj_type ktype_ec_sdo = {

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    .release = ec_sdo_clear,

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    .sysfs_ops = &sdo_sysfs_ops,

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    .default_attrs = sdo_def_attrs

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};

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/** \endcond */

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

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/** Sdo constructor.

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 *

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 * \todo Turn parameters.

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 */

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int ec_sdo_init(

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        ec_sdo_t *sdo, /**< Sdo. */

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        uint16_t index, /**< Sdo index. */

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        ec_slave_t *slave /**< Parent slave. */

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        )

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{

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    sdo->slave = slave;

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    sdo->index = index;

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    sdo->object_code = 0x00;

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    sdo->name = NULL;

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    sdo->subindices = 0;

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    INIT_LIST_HEAD(&sdo->entries);

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    // Init kobject and add it to the hierarchy

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    memset(&sdo->kobj, 0x00, sizeof(struct kobject));

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    kobject_init(&sdo->kobj);

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    sdo->kobj.ktype = &ktype_ec_sdo;

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    sdo->kobj.parent = &slave->sdo_kobj;

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    if (kobject_set_name(&sdo->kobj, "%4X", sdo->index)) {

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        EC_ERR("Failed to set kobj name.\n");

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        kobject_put(&sdo->kobj);

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        return -1;

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    }

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    if (kobject_add(&sdo->kobj)) {

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        EC_ERR("Failed to add Sdo kobject.\n");

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        kobject_put(&sdo->kobj);

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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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/** Sdo destructor.

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 *

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 * Clears and frees an Sdo object.

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 */

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void ec_sdo_destroy(

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        ec_sdo_t *sdo /**< Sdo. */

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        )

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{

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    ec_sdo_entry_t *entry, *next;

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    // free all entries

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    list_for_each_entry_safe(entry, next, &sdo->entries, list) {

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        list_del(&entry->list);

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        ec_sdo_entry_destroy(entry);

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    }

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    // destroy self

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    kobject_del(&sdo->kobj);

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    kobject_put(&sdo->kobj);

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}

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

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/** Clear and free Sdo.

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 *

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 * This method is called by the kobject,

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 * once there are no more references to it.

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 */

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void ec_sdo_clear(

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        struct kobject *kobj /**< Sdo's kobject. */

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        )

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{

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    ec_sdo_t *sdo = container_of(kobj, ec_sdo_t, kobj);

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    if (sdo->name) kfree(sdo->name);

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    kfree(sdo);

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}

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

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/** Get and Sdo entry from an Sdo via its subindex.

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 * 

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 * \retval >0 Pointer to the requested Sdo entry.

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 * \retval NULL Sdo entry not found.

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 */

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ec_sdo_entry_t *ec_sdo_get_entry(

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        ec_sdo_t *sdo, /**< Sdo. */

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        uint8_t subindex /**< Entry subindex. */

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        )

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{

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    ec_sdo_entry_t *entry;

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    list_for_each_entry(entry, &sdo->entries, list) {

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        if (entry->subindex != subindex) continue;

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        return entry;

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    }

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    return NULL;

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}

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

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/** Print Sdo information to a buffer.

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 * 

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 * /return size of bytes written to buffer.

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 */ 

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ssize_t ec_sdo_info(

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        ec_sdo_t *sdo, /**< Sdo. */

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        char *buffer /**< Target buffer. */

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        )

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{

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    off_t off = 0;

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    off += sprintf(buffer + off, "Index: 0x%04X\n", sdo->index);

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    off += sprintf(buffer + off, "Name: %s\n", sdo->name ? sdo->name : "");

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    off += sprintf(buffer + off, "Subindices: %i\n", sdo->subindices);

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    return off;

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}

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

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/** Show a Sysfs attribute of an Sdo.

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 * 

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 * /return Number of bytes written to buffer.

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 */ 

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ssize_t ec_show_sdo_attribute(

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        struct kobject *kobj, /**< kobject */

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        struct attribute *attr, /**< Requested attribute. */

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        char *buffer /**< Buffer to write the data in. */

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        )

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{

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    ec_sdo_t *sdo = container_of(kobj, ec_sdo_t, kobj);

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    if (attr == &attr_info) {

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        return ec_sdo_info(sdo, buffer);

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    }

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    return 0;

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}

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