master/foe_request.c
author Florian Pose <fp@gh.de>
Fri, 03 Mar 2017 13:55:01 +0100
branchstable-1.5
changeset 2668 dd32f74ee76e
parent 2522 ec403cf308eb
permissions -rw-r--r--
Merged CRC command.
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/******************************************************************************
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 *
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 *  $Id$
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 *
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 *  Copyright (C) 2008  Olav Zarges, imc Messsysteme GmbH
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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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 *****************************************************************************/
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/** \file
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 * File-over-EtherCAT request functions.
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 */
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/*****************************************************************************/
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#include <linux/module.h>
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#include <linux/jiffies.h>
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#include <linux/slab.h>
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#include "foe_request.h"
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#include "foe.h"
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/*****************************************************************************/
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/** Default timeout in ms to wait for FoE transfer responses.
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 */
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#define EC_FOE_REQUEST_RESPONSE_TIMEOUT 3000
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/*****************************************************************************/
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void ec_foe_request_clear_data(ec_foe_request_t *);
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/*****************************************************************************/
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/** FoE request constructor.
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 */
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void ec_foe_request_init(
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        ec_foe_request_t *req, /**< FoE request. */
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        uint8_t* file_name /** filename */)
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{
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    INIT_LIST_HEAD(&req->list);
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    req->buffer = NULL;
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    req->file_name = file_name;
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    req->buffer_size = 0;
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    req->data_size = 0;
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    req->dir = EC_DIR_INVALID;
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    req->issue_timeout = 0; // no timeout
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    req->response_timeout = EC_FOE_REQUEST_RESPONSE_TIMEOUT;
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    req->state = EC_INT_REQUEST_INIT;
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    req->result = FOE_BUSY;
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    req->error_code = 0x00000000;
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}
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/*****************************************************************************/
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/** FoE request destructor.
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 */
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void ec_foe_request_clear(
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        ec_foe_request_t *req /**< FoE request. */
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        )
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{
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    ec_foe_request_clear_data(req);
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}
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/*****************************************************************************/
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/** FoE request destructor.
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 */
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void ec_foe_request_clear_data(
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        ec_foe_request_t *req /**< FoE request. */
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        )
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{
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    if (req->buffer) {
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        kfree(req->buffer);
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        req->buffer = NULL;
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    }
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    req->buffer_size = 0;
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    req->data_size = 0;
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}
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/*****************************************************************************/
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/** Pre-allocates the data memory.
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 *
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 * If the internal \a buffer_size is already bigger than \a size, nothing is
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 * done.
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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_foe_request_alloc(
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        ec_foe_request_t *req, /**< FoE request. */
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        size_t size /**< Data size to allocate. */
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        )
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{
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    if (size <= req->buffer_size) {
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        return 0;
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    }
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    ec_foe_request_clear_data(req);
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    if (!(req->buffer = (uint8_t *) kmalloc(size, GFP_KERNEL))) {
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        EC_ERR("Failed to allocate %zu bytes of FoE memory.\n", size);
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        return -ENOMEM;
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    }
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    req->buffer_size = size;
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    req->data_size = 0;
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    return 0;
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}
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/*****************************************************************************/
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/** Copies FoE data from an external source.
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 *
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 * If the \a buffer_size is to small, new memory is allocated.
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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_foe_request_copy_data(
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        ec_foe_request_t *req, /**< FoE request. */
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        const uint8_t *source, /**< Source data. */
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        size_t size /**< Number of bytes in \a source. */
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        )
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{
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    int ret;
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    ret = ec_foe_request_alloc(req, size);
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    if (ret) {
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        return ret;
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    }
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    memcpy(req->buffer, source, size);
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    req->data_size = size;
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    return 0;
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}
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/*****************************************************************************/
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/** Checks, if the timeout was exceeded.
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 *
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 * \return non-zero if the timeout was exceeded, else zero.
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 */
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int ec_foe_request_timed_out(
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        const ec_foe_request_t *req /**< FoE request. */
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        )
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{
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    return req->issue_timeout
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        && jiffies - req->jiffies_start > HZ * req->issue_timeout / 1000;
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}
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/*****************************************************************************/
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/** Set the request timeout.
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 */
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void ec_foe_request_timeout(
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        ec_foe_request_t *req, /**< FoE request. */
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        uint32_t timeout /**< Timeout in ms. */
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        )
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{
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    req->issue_timeout = timeout;
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}
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/*****************************************************************************/
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/** Returns a pointer to the request's data.
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 *
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 * \return Data pointer.
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 */
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uint8_t *ec_foe_request_data(
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        ec_foe_request_t *req /**< FoE request. */
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        )
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{
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    return req->buffer;
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}
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/*****************************************************************************/
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/** Returns the data size.
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 *
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 * \return Data size.
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 */
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size_t ec_foe_request_data_size(
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        const ec_foe_request_t *req /**< FoE request. */
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        )
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{
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    return req->data_size;
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}
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/*****************************************************************************/
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/** Prepares a read request (slave to master).
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 */
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void ec_foe_request_read(
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        ec_foe_request_t *req /**< FoE request. */
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   216
        )
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{
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    req->dir = EC_DIR_INPUT;
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    req->state = EC_INT_REQUEST_QUEUED;
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    req->result = FOE_BUSY;
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    req->jiffies_start = jiffies;
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   222
}
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/*****************************************************************************/
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/** Prepares a write request (master to slave).
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 */
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void ec_foe_request_write(
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   229
        ec_foe_request_t *req /**< FoE request. */
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   230
        )
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{
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    req->dir = EC_DIR_OUTPUT;
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    req->state = EC_INT_REQUEST_QUEUED;
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    req->result = FOE_BUSY;
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    req->jiffies_start = jiffies;
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   236
}
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/*****************************************************************************/