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/**
* @file
*
* @ingroup CANBus
*
* @brief Controller Area Network (CAN) loopback device Implementation
*
*/
/*
* Copyright (C) 2022 Prashanth S (fishesprashanth@gmail.com)
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <dev/can/can.h>
struct can_loopback_priv {
struct can_bus *bus;
};
static bool can_loopback_tx_ready(void *data);
static void can_loopback_int(void *data, bool flag);
static int can_loopback_tx(void *data, struct can_msg *msg);
int can_loopback_init(const char *can_dev_file);
static struct can_dev_ops dev_ops = {
.dev_tx = can_loopback_tx,
.dev_tx_ready = can_loopback_tx_ready,
.dev_int = can_loopback_int,
};
static bool can_loopback_tx_ready(void *data)
{
return true;
}
static void can_loopback_int(void *data, bool flag)
{
return;
}
static int can_loopback_tx(void *data, struct can_msg *msg)
{
struct can_loopback_priv *priv = data;
can_receive(priv->bus, msg);
return RTEMS_SUCCESSFUL;
}
int can_loopback_init(const char *can_dev_file)
{
int ret;
struct can_loopback_priv *priv = NULL;
struct can_bus *bus = can_bus_alloc_and_init(sizeof(struct can_bus));
if (bus == NULL) {
CAN_ERR("can_loopback_init: can_bus_alloc_and_init failed\n");
return RTEMS_NO_MEMORY;
}
priv = (struct can_loopback_priv *)calloc(1, sizeof(struct can_loopback_priv));
if (priv == NULL) {
CAN_ERR("can_loopback_init: calloc failed\n");
ret = RTEMS_NO_MEMORY;
goto free_bus_return;
}
priv->bus = bus;
bus->priv = priv;
priv->bus->can_dev_ops = &dev_ops;
if ((ret = can_bus_register(bus, can_dev_file)) != RTEMS_SUCCESSFUL) {
CAN_ERR("can_loopback_init: bus register failed\n");
goto free_priv_return;
}
CAN_DEBUG("can_loopback_init: can_loopback driver registered\n");
return ret;
free_priv_return:
free(priv);
free_bus_return:
free(bus);
return ret;
}
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