foe_request.c

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/*****************************************************************************
 *
 *  Copyright (C) 2008  Olav Zarges, imc Messsysteme GmbH
 *  Copyright (C) 2020  Florian Pose, 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
 *
 ****************************************************************************/

 
/****************************************************************************/
 
#include <linux/module.h>
#include <linux/jiffies.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
 
#include "foe_request.h"
#include "foe.h"
 
/****************************************************************************/

#define EC_FOE_REQUEST_RESPONSE_TIMEOUT 3000
 
/****************************************************************************/
 
// prototypes for private methods
void ec_foe_request_clear_data(ec_foe_request_t *);
 
/****************************************************************************/

void ec_foe_request_init(
        ec_foe_request_t *req, 
        uint8_t* file_name )
{
    INIT_LIST_HEAD(&req->list);
    req->buffer = NULL;
    req->file_name = file_name;
    req->buffer_size = 0;
    req->data_size = 0;
    req->dir = EC_DIR_INVALID;
    req->issue_timeout = 0; // no timeout
    req->response_timeout = EC_FOE_REQUEST_RESPONSE_TIMEOUT;
    req->state = EC_INT_REQUEST_INIT;
    req->result = FOE_BUSY;
    req->error_code = 0x00000000;
}
 
/****************************************************************************/

void ec_foe_request_clear(
        ec_foe_request_t *req 
        )
{
    ec_foe_request_clear_data(req);
}
 
/****************************************************************************/

void ec_foe_request_clear_data(
        ec_foe_request_t *req 
        )
{
    if (req->buffer) {
        vfree(req->buffer);
        req->buffer = NULL;
    }
 
    req->buffer_size = 0;
    req->data_size = 0;
}
 
/****************************************************************************/

int ec_foe_request_alloc(
        ec_foe_request_t *req, 
        size_t size 
        )
{
    if (size <= req->buffer_size) {
        return 0;
    }
 
    ec_foe_request_clear_data(req);
 
    if (!(req->buffer = (uint8_t *) vmalloc(size))) {
        EC_ERR("Failed to allocate %zu bytes of FoE memory.\n", size);
        return -ENOMEM;
    }
 
    req->buffer_size = size;
    req->data_size = 0;
    return 0;
}
 
/****************************************************************************/

int ec_foe_request_copy_data(
        ec_foe_request_t *req, 
        const uint8_t *source, 
        size_t size 
        )
{
    int ret;
 
    ret = ec_foe_request_alloc(req, size);
    if (ret) {
        return ret;
    }
 
    memcpy(req->buffer, source, size);
    req->data_size = size;
    return 0;
}
 
/****************************************************************************/

int ec_foe_request_timed_out(
        const ec_foe_request_t *req 
        )
{
    return req->issue_timeout
        && jiffies - req->jiffies_start > HZ * req->issue_timeout / 1000;
}
 
/****************************************************************************/

void ec_foe_request_read(
        ec_foe_request_t *req 
        )
{
    req->dir = EC_DIR_INPUT;
    req->state = EC_INT_REQUEST_QUEUED;
    req->result = FOE_BUSY;
    req->jiffies_start = jiffies;
}
 
/****************************************************************************/

void ec_foe_request_write(
        ec_foe_request_t *req 
        )
{
    req->dir = EC_DIR_OUTPUT;
    req->state = EC_INT_REQUEST_QUEUED;
    req->result = FOE_BUSY;
    req->jiffies_start = jiffies;
}
 
/****************************************************************************/