author | Florian Pose <fp@gh.de> |
Fri, 03 Mar 2017 13:55:01 +0100 | |
branch | stable-1.5 |
changeset 2668 | dd32f74ee76e |
parent 2522 | ec403cf308eb |
permissions | -rw-r--r-- |
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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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/*****************************************************************************/ |
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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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|
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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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/*****************************************************************************/ |
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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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/*****************************************************************************/ |
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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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|
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/*****************************************************************************/ |