Avoided unused return value warning.
/******************************************************************************
*
* $Id$
*
* Copyright (C) 2006-2012 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.
*
*****************************************************************************/
/**
\file
EtherCAT datagram pair methods.
*/
/*****************************************************************************/
#include <linux/slab.h>
#include "master.h"
#include "datagram_pair.h"
/*****************************************************************************/
/** Datagram pair constructor.
*
* \return Zero on success, otherwise a negative error code.
*/
int ec_datagram_pair_init(
ec_datagram_pair_t *pair, /**< Datagram pair. */
ec_domain_t *domain, /**< Parent domain. */
uint32_t logical_offset, /**< Logical offset. */
uint8_t *data, /**< Data pointer. */
size_t data_size, /**< Data size. */
const unsigned int used[] /**< input/output use count. */
)
{
ec_device_index_t dev_idx;
int ret;
INIT_LIST_HEAD(&pair->list);
pair->domain = domain;
for (dev_idx = EC_DEVICE_MAIN;
dev_idx < ec_master_num_devices(domain->master); dev_idx++) {
ec_datagram_init(&pair->datagrams[dev_idx]);
snprintf(pair->datagrams[dev_idx].name,
EC_DATAGRAM_NAME_SIZE, "domain%u-%u-%s", domain->index,
logical_offset, ec_device_names[dev_idx != 0]);
pair->datagrams[dev_idx].device_index = dev_idx;
}
pair->expected_working_counter = 0U;
for (dev_idx = EC_DEVICE_BACKUP;
dev_idx < ec_master_num_devices(domain->master); dev_idx++) {
/* backup datagrams have their own memory */
ret = ec_datagram_prealloc(&pair->datagrams[dev_idx], data_size);
if (ret) {
goto out_datagrams;
}
}
#if EC_MAX_NUM_DEVICES > 1
if (!(pair->send_buffer = kmalloc(data_size, GFP_KERNEL))) {
EC_MASTER_ERR(domain->master,
"Failed to allocate domain send buffer!\n");
ret = -ENOMEM;
goto out_datagrams;
}
#endif
/* The ec_datagram_lxx() calls below can not fail, because either the
* datagram has external memory or it is preallocated. */
if (used[EC_DIR_OUTPUT] && used[EC_DIR_INPUT]) { // inputs and outputs
ec_datagram_lrw_ext(&pair->datagrams[EC_DEVICE_MAIN],
logical_offset, data_size, data);
for (dev_idx = EC_DEVICE_BACKUP;
dev_idx < ec_master_num_devices(domain->master); dev_idx++) {
ec_datagram_lrw(&pair->datagrams[dev_idx],
logical_offset, data_size);
}
// If LRW is used, output FMMUs increment the working counter by 2,
// while input FMMUs increment it by 1.
pair->expected_working_counter =
used[EC_DIR_OUTPUT] * 2 + used[EC_DIR_INPUT];
} else if (used[EC_DIR_OUTPUT]) { // outputs only
ec_datagram_lwr_ext(&pair->datagrams[EC_DEVICE_MAIN],
logical_offset, data_size, data);
for (dev_idx = EC_DEVICE_BACKUP;
dev_idx < ec_master_num_devices(domain->master); dev_idx++) {
ec_datagram_lwr(&pair->datagrams[dev_idx],
logical_offset, data_size);
}
pair->expected_working_counter = used[EC_DIR_OUTPUT];
} else { // inputs only (or nothing)
ec_datagram_lrd_ext(&pair->datagrams[EC_DEVICE_MAIN],
logical_offset, data_size, data);
for (dev_idx = EC_DEVICE_BACKUP;
dev_idx < ec_master_num_devices(domain->master); dev_idx++) {
ec_datagram_lrd(&pair->datagrams[dev_idx], logical_offset,
data_size);
}
pair->expected_working_counter = used[EC_DIR_INPUT];
}
for (dev_idx = EC_DEVICE_MAIN;
dev_idx < ec_master_num_devices(domain->master); dev_idx++) {
ec_datagram_zero(&pair->datagrams[dev_idx]);
}
return 0;
out_datagrams:
for (dev_idx = EC_DEVICE_MAIN;
dev_idx < ec_master_num_devices(domain->master); dev_idx++) {
ec_datagram_clear(&pair->datagrams[dev_idx]);
}
return ret;
}
/*****************************************************************************/
/** Datagram pair destructor.
*/
void ec_datagram_pair_clear(
ec_datagram_pair_t *pair /**< Datagram pair. */
)
{
unsigned int dev_idx;
for (dev_idx = EC_DEVICE_MAIN;
dev_idx < ec_master_num_devices(pair->domain->master);
dev_idx++) {
ec_datagram_clear(&pair->datagrams[dev_idx]);
}
#if EC_MAX_NUM_DEVICES > 1
if (pair->send_buffer) {
kfree(pair->send_buffer);
}
#endif
}
/*****************************************************************************/
/** Process received data.
*
* \return Working counter sum over all devices.
*/
uint16_t ec_datagram_pair_process(
ec_datagram_pair_t *pair, /**< Datagram pair. */
uint16_t wc_sum[] /**< Working counter sums. */
)
{
unsigned int dev_idx;
uint16_t pair_wc = 0;
for (dev_idx = 0; dev_idx < ec_master_num_devices(pair->domain->master);
dev_idx++) {
ec_datagram_t *datagram = &pair->datagrams[dev_idx];
#ifdef EC_RT_SYSLOG
ec_datagram_output_stats(datagram);
#endif
if (datagram->state == EC_DATAGRAM_RECEIVED) {
pair_wc += datagram->working_counter;
wc_sum[dev_idx] += datagram->working_counter;
}
}
return pair_wc;
}
/*****************************************************************************/