master/reg_request.c
author Florian Pose <fp@gh.de>
Fri, 03 Mar 2017 13:55:01 +0100
branchstable-1.5
changeset 2668 dd32f74ee76e
parent 2529 c7e1f2616a9d
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) 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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 *****************************************************************************/
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/** \file
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 * Register 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 "reg_request.h"
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/*****************************************************************************/
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/** Register request constructor.
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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_reg_request_init(
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        ec_reg_request_t *reg, /**< Register request. */
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        size_t size /**< Memory size. */
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        )
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{
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    if (!(reg->data = (uint8_t *) kmalloc(size, GFP_KERNEL))) {
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        EC_ERR("Failed to allocate %zu bytes of register memory.\n", size);
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        return -ENOMEM;
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    }
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    INIT_LIST_HEAD(&reg->list);
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    reg->mem_size = size;
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    memset(reg->data, 0x00, size);
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    reg->dir = EC_DIR_INVALID;
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    reg->address = 0;
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    reg->transfer_size = 0;
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    reg->state = EC_INT_REQUEST_INIT;
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    reg->ring_position = 0;
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    return 0;
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}
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/*****************************************************************************/
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/** Register request destructor.
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 */
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void ec_reg_request_clear(
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        ec_reg_request_t *reg /**< Register request. */
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        )
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{
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    if (reg->data) {
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        kfree(reg->data);
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    }
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}
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/*****************************************************************************
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 * Application interface.
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 ****************************************************************************/
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uint8_t *ecrt_reg_request_data(ec_reg_request_t *reg)
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{
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    return reg->data;
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}
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/*****************************************************************************/
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ec_request_state_t ecrt_reg_request_state(const ec_reg_request_t *reg)
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{
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   return ec_request_state_translation_table[reg->state];
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}
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/*****************************************************************************/
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void ecrt_reg_request_write(ec_reg_request_t *reg, uint16_t address,
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        size_t size)
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{
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    reg->dir = EC_DIR_OUTPUT;
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    reg->address = address;
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    reg->transfer_size = min(size, reg->mem_size);
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    reg->state = EC_INT_REQUEST_QUEUED;
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}
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/*****************************************************************************/
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void ecrt_reg_request_read(ec_reg_request_t *reg, uint16_t address,
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        size_t size)
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{
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    reg->dir = EC_DIR_INPUT;
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    reg->address = address;
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    reg->transfer_size = min(size, reg->mem_size);
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    reg->state = EC_INT_REQUEST_QUEUED;
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}
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/*****************************************************************************/
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/** \cond */
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EXPORT_SYMBOL(ecrt_reg_request_data);
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EXPORT_SYMBOL(ecrt_reg_request_state);
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EXPORT_SYMBOL(ecrt_reg_request_write);
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EXPORT_SYMBOL(ecrt_reg_request_read);
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/** \endcond */
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/*****************************************************************************/