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/******************************************************************************
*
* $Id$
*
* Copyright (C) 2012 Florian Pose, Ingenieurgemeinschaft IgH
*
* This file is part of the IgH EtherCAT Master.
*
* The IgH EtherCAT Master is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version 2, as
* published by the Free Software Foundation.
*
* The IgH EtherCAT Master is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
* Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with the IgH EtherCAT Master; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* ---
*
* The license mentioned above concerns the source code only. Using the
* EtherCAT technology and brand is only permitted in compliance with the
* industrial property and similar rights of Beckhoff Automation GmbH.
*
* vim: expandtab
*
*****************************************************************************/
/** \file
* EtherCAT CoE emergency ring buffer methods.
*/
/*****************************************************************************/
#include <linux/slab.h>
#include "coe_emerg_ring.h"
/*****************************************************************************/
/** Emergency ring buffer constructor.
*/
void ec_coe_emerg_ring_init(
ec_coe_emerg_ring_t *ring, /**< Emergency ring. */
ec_slave_config_t *sc /**< Slave configuration. */
)
{
ring->sc = sc;
ring->msgs = NULL;
ring->size = 0;
ring->read_index = 0;
ring->write_index = 0;
ring->overruns = 0;
}
/*****************************************************************************/
/** Emergency ring buffer destructor.
*/
void ec_coe_emerg_ring_clear(
ec_coe_emerg_ring_t *ring /**< Emergency ring. */
)
{
if (ring->msgs) {
kfree(ring->msgs);
}
}
/*****************************************************************************/
/** Set the ring size.
*
* \return Zero on success, otherwise a negative error code.
*/
int ec_coe_emerg_ring_size(
ec_coe_emerg_ring_t *ring, /**< Emergency ring. */
size_t size /**< Maximum number of messages in the ring. */
)
{
ring->size = 0;
if (size < 0) {
size = 0;
}
ring->read_index = ring->write_index = 0;
if (ring->msgs) {
kfree(ring->msgs);
}
ring->msgs = NULL;
if (size == 0) {
return 0;
}
ring->msgs = kmalloc(sizeof(ec_coe_emerg_msg_t) * (size + 1), GFP_KERNEL);
if (!ring->msgs) {
return -ENOMEM;
}
ring->size = size;
return 0;
}
/*****************************************************************************/
/** Add a new emergency message.
*/
void ec_coe_emerg_ring_push(
ec_coe_emerg_ring_t *ring, /**< Emergency ring. */
const u8 *msg /**< Emergency message. */
)
{
if (!ring->size ||
(ring->write_index + 1) % (ring->size + 1) == ring->read_index) {
ring->overruns++;
return;
}
memcpy(ring->msgs[ring->write_index].data, msg,
EC_COE_EMERGENCY_MSG_SIZE);
ring->write_index = (ring->write_index + 1) % (ring->size + 1);
}
/*****************************************************************************/
/** Remove an emergency message from the ring.
*
* \return Zero on success, otherwise a negative error code.
*/
int ec_coe_emerg_ring_pop(
ec_coe_emerg_ring_t *ring, /**< Emergency ring. */
u8 *msg /**< Memory to store the emergency message. */
)
{
if (ring->read_index == ring->write_index) {
return -ENOENT;
}
memcpy(msg, ring->msgs[ring->read_index].data, EC_COE_EMERGENCY_MSG_SIZE);
ring->read_index = (ring->read_index + 1) % (ring->size + 1);
return 0;
}
/*****************************************************************************/
/** Clear the ring.
*
* \return Zero on success, otherwise a negative error code.
*/
int ec_coe_emerg_ring_clear_ring(
ec_coe_emerg_ring_t *ring /**< Emergency ring. */
)
{
ring->read_index = ring->write_index;
ring->overruns = 0;
return 0;
}
/*****************************************************************************/
/** Read the number of overruns.
*
* \return Number of overruns.
*/
int ec_coe_emerg_ring_overruns(
ec_coe_emerg_ring_t *ring /**< Emergency ring. */
)
{
return ring->overruns;
}
/*****************************************************************************/
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