forked from Imagelibrary/rtems
108 lines
2.9 KiB
C
108 lines
2.9 KiB
C
/* SPDX-License-Identifier: BSD-2-Clause */
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/**
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* @file
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*
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* @ingroup libmisc_devnull Device Driver
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*
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* @brief Devzero
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*/
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/*
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* Copyright (c) 2011 embedded brains GmbH & Co. KG
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <rtems/devzero.h>
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#include <string.h>
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#include <rtems/libio.h>
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rtems_device_driver dev_zero_initialize(
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rtems_device_major_number major,
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rtems_device_minor_number minor RTEMS_UNUSED,
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void *arg RTEMS_UNUSED
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)
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{
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return rtems_io_register_name(DEVZERO_DEVICE_NAME, major, 0);
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}
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rtems_device_driver dev_zero_open(
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rtems_device_major_number major RTEMS_UNUSED,
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rtems_device_minor_number minor RTEMS_UNUSED,
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void *arg RTEMS_UNUSED
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)
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{
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return RTEMS_SUCCESSFUL;
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}
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rtems_device_driver dev_zero_close(
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rtems_device_major_number major RTEMS_UNUSED,
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rtems_device_minor_number minor RTEMS_UNUSED,
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void *arg RTEMS_UNUSED
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)
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{
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return RTEMS_SUCCESSFUL;
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}
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rtems_device_driver dev_zero_read(
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rtems_device_major_number major RTEMS_UNUSED,
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rtems_device_minor_number minor RTEMS_UNUSED,
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void *arg RTEMS_UNUSED
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)
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{
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rtems_libio_rw_args_t *rw = arg;
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rw->bytes_moved = rw->count;
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memset(rw->buffer, 0, rw->count);
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return RTEMS_SUCCESSFUL;
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}
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rtems_device_driver dev_zero_write(
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rtems_device_major_number major RTEMS_UNUSED,
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rtems_device_minor_number minor RTEMS_UNUSED,
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void *arg
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)
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{
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rtems_libio_rw_args_t *rw = arg;
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rw->bytes_moved = rw->count;
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return RTEMS_SUCCESSFUL;
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}
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rtems_device_driver dev_zero_control(
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rtems_device_major_number major RTEMS_UNUSED,
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rtems_device_minor_number minor RTEMS_UNUSED,
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void *arg RTEMS_UNUSED
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)
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{
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return RTEMS_IO_ERROR;
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}
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