master/coe_emerg_ring.c
author Florian Pose <fp@igh-essen.com>
Wed, 05 Nov 2014 15:06:54 +0100
changeset 2590 0e207abed88a
parent 2589 2b9c78543663
permissions -rw-r--r--
Made some throw methods static.
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/******************************************************************************
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 *
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 *  $Id$
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 *
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 *  Copyright (C) 2012  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 and/or
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 *  modify it under the terms of the GNU General Public License version 2, as
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 *  published by the Free Software Foundation.
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 *
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 *  The IgH EtherCAT Master is distributed in the hope that it will be useful,
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 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
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 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General
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 *  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 along
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 *  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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 *  ---
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 *
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 *  The license mentioned above concerns the source code only. Using the
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 *  EtherCAT technology and brand is only permitted in compliance with the
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 *  industrial property and similar rights of Beckhoff Automation GmbH.
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 *
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 *  vim: expandtab
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 *
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 *****************************************************************************/
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/** \file
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 * EtherCAT CoE emergency ring buffer methods.
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 */
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/*****************************************************************************/
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#include <linux/slab.h>
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#include "coe_emerg_ring.h"
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/*****************************************************************************/
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/** Emergency ring buffer constructor.
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 */
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void ec_coe_emerg_ring_init(
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        ec_coe_emerg_ring_t *ring, /**< Emergency ring. */
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        ec_slave_config_t *sc /**< Slave configuration. */
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        )
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{
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    ring->sc = sc;
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    ring->msgs = NULL;
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    ring->size = 0;
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    ring->read_index = 0;
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    ring->write_index = 0;
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    ring->overruns = 0;
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}
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/*****************************************************************************/
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/** Emergency ring buffer destructor.
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 */
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void ec_coe_emerg_ring_clear(
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        ec_coe_emerg_ring_t *ring /**< Emergency ring. */
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        )
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{
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    if (ring->msgs) {
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        kfree(ring->msgs);
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    }
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}
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/*****************************************************************************/
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/** Set the ring size.
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 *
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 * \return Zero on success, otherwise a negative error code.
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 */
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int ec_coe_emerg_ring_size(
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        ec_coe_emerg_ring_t *ring, /**< Emergency ring. */
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        size_t size /**< Maximum number of messages in the ring. */
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        )
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{
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    ring->size = 0;
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    if (size < 0) {
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        size = 0;
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    }
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    ring->read_index = ring->write_index = 0;
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    if (ring->msgs) {
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        kfree(ring->msgs);
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    }
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    ring->msgs = NULL;
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    if (size == 0) {
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        return 0;
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    }
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    ring->msgs = kmalloc(sizeof(ec_coe_emerg_msg_t) * (size + 1), GFP_KERNEL);
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    if (!ring->msgs) {
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        return -ENOMEM;
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    }
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    ring->size = size;
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    return 0;
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}
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/*****************************************************************************/
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/** Add a new emergency message.
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 */
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void ec_coe_emerg_ring_push(
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        ec_coe_emerg_ring_t *ring, /**< Emergency ring. */
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        const u8 *msg /**< Emergency message. */
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        )
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{
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    if (!ring->size ||
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            (ring->write_index + 1) % (ring->size + 1) == ring->read_index) {
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        ring->overruns++;
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        return;
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    }
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    memcpy(ring->msgs[ring->write_index].data, msg,
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            EC_COE_EMERGENCY_MSG_SIZE);
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    ring->write_index = (ring->write_index + 1) % (ring->size + 1);
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}
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/*****************************************************************************/
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/** Remove an emergency message from the ring.
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 *
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 * \return Zero on success, otherwise a negative error code.
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 */
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int ec_coe_emerg_ring_pop(
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        ec_coe_emerg_ring_t *ring, /**< Emergency ring. */
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        u8 *msg /**< Memory to store the emergency message. */
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        )
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{
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    if (ring->read_index == ring->write_index) {
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        return -ENOENT;
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    }
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    memcpy(msg, ring->msgs[ring->read_index].data, EC_COE_EMERGENCY_MSG_SIZE);
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    ring->read_index = (ring->read_index + 1) % (ring->size + 1);
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    return 0;
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}
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/*****************************************************************************/
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/** Clear the ring.
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 *
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 * \return Zero on success, otherwise a negative error code.
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 */
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int ec_coe_emerg_ring_clear_ring(
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        ec_coe_emerg_ring_t *ring /**< Emergency ring. */
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        )
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{
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    ring->read_index = ring->write_index;
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    ring->overruns = 0;
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    return 0;
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}
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/*****************************************************************************/
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/** Read the number of overruns.
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 *
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 * \return Number of overruns.
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 */
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int ec_coe_emerg_ring_overruns(
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        ec_coe_emerg_ring_t *ring /**< Emergency ring. */
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        )
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{
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    return ring->overruns;
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}
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/*****************************************************************************/