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/* SPDX-License-Identifier: BSD-2-Clause */
/**
* @file
*
* @ingroup libmisc_devnull Device Driver
*
* @brief Devzero
*/
/*
* Copyright (c) 2011 embedded brains GmbH & Co. KG
*
* 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <rtems/devzero.h>
#include <string.h>
#include <rtems/libio.h>
rtems_device_driver dev_zero_initialize(
rtems_device_major_number major,
rtems_device_minor_number minor RTEMS_UNUSED,
void *arg RTEMS_UNUSED
)
{
return rtems_io_register_name(DEVZERO_DEVICE_NAME, major, 0);
}
rtems_device_driver dev_zero_open(
rtems_device_major_number major RTEMS_UNUSED,
rtems_device_minor_number minor RTEMS_UNUSED,
void *arg RTEMS_UNUSED
)
{
return RTEMS_SUCCESSFUL;
}
rtems_device_driver dev_zero_close(
rtems_device_major_number major RTEMS_UNUSED,
rtems_device_minor_number minor RTEMS_UNUSED,
void *arg RTEMS_UNUSED
)
{
return RTEMS_SUCCESSFUL;
}
rtems_device_driver dev_zero_read(
rtems_device_major_number major RTEMS_UNUSED,
rtems_device_minor_number minor RTEMS_UNUSED,
void *arg RTEMS_UNUSED
)
{
rtems_libio_rw_args_t *rw = arg;
rw->bytes_moved = rw->count;
memset(rw->buffer, 0, rw->count);
return RTEMS_SUCCESSFUL;
}
rtems_device_driver dev_zero_write(
rtems_device_major_number major RTEMS_UNUSED,
rtems_device_minor_number minor RTEMS_UNUSED,
void *arg
)
{
rtems_libio_rw_args_t *rw = arg;
rw->bytes_moved = rw->count;
return RTEMS_SUCCESSFUL;
}
rtems_device_driver dev_zero_control(
rtems_device_major_number major RTEMS_UNUSED,
rtems_device_minor_number minor RTEMS_UNUSED,
void *arg RTEMS_UNUSED
)
{
return RTEMS_IO_ERROR;
}
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