* libs/libc/stream/lib_mtdsostream.c
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <unistd.h>
#include <nuttx/streams.h>
#include <nuttx/fs/fs.h>
#include <nuttx/mtd/mtd.h>
#include "libc.h"
* Pre-processor Definitions
****************************************************************************/
#if !defined(CONFIG_DISABLE_MOUNTPOINT) && defined(CONFIG_MTD)
* Private Functions
****************************************************************************/
* Name: mtdsostream_flush
****************************************************************************/
static int mtdsostream_flush(FAR struct lib_sostream_s *self)
{
FAR struct lib_mtdsostream_s *stream =
(FAR struct lib_mtdsostream_s *)self;
FAR struct mtd_dev_s *mtd = stream->inode->u.i_mtd;
size_t erasesize = stream->geo.erasesize;
size_t nblkpererase = erasesize / stream->geo.blocksize;
int ret = OK;
if (self->nput % erasesize > 0)
{
size_t sblock = self->nput / erasesize;
ret = MTD_ERASE(mtd, sblock, 1);
if (ret < 0)
{
return ret;
}
ret = MTD_BWRITE(mtd, sblock * nblkpererase,
nblkpererase, stream->cache);
}
return ret;
}
* Name: mtdsostream_puts
****************************************************************************/
static ssize_t mtdsostream_puts(FAR struct lib_sostream_s *self,
FAR const void *buf, size_t len)
{
FAR struct lib_mtdsostream_s *stream =
(FAR struct lib_mtdsostream_s *)self;
FAR struct mtd_dev_s *mtd = stream->inode->u.i_mtd;
size_t erasesize = stream->geo.erasesize;
size_t nblkpererase = erasesize / stream->geo.blocksize;
FAR const unsigned char *ptr = buf;
size_t remain = len;
ssize_t ret;
if (self->nput + len > erasesize * stream->geo.neraseblocks)
{
return -ENOSPC;
}
while (remain > 0)
{
off_t sblock = self->nput / erasesize;
off_t offset = self->nput % erasesize;
if (offset > 0)
{
size_t copyin = offset + remain > erasesize ?
erasesize - offset : remain;
memcpy(stream->cache + offset, ptr, copyin);
ptr += copyin;
offset += copyin;
self->nput += copyin;
remain -= copyin;
if (offset == erasesize)
{
ret = MTD_ERASE(mtd, sblock, 1);
if (ret < 0)
{
return ret;
}
ret = MTD_BWRITE(mtd, sblock * nblkpererase,
nblkpererase, stream->cache);
if (ret < 0)
{
return ret;
}
}
}
else if (remain < erasesize)
{
ret = MTD_BREAD(mtd, sblock * nblkpererase,
nblkpererase, stream->cache);
if (ret < 0)
{
return ret;
}
memcpy(stream->cache, ptr, remain);
self->nput += remain;
remain = 0;
}
else
{
size_t nblock = remain / erasesize;
size_t copyin = nblock * erasesize;
ret = MTD_ERASE(mtd, sblock, nblock);
if (ret < 0)
{
return ret;
}
ret = MTD_BWRITE(mtd, sblock * nblkpererase,
nblock * nblkpererase, ptr);
if (ret < 0)
{
return ret;
}
ptr += copyin;
self->nput += copyin;
remain -= copyin;
}
}
return len;
}
* Name: mtdsostream_putc
****************************************************************************/
static void mtdsostream_putc(FAR struct lib_sostream_s *self, int ch)
{
char tmp = ch;
mtdsostream_puts(self, &tmp, 1);
}
* Name: mtdsostream_seek
****************************************************************************/
static off_t mtdsostream_seek(FAR struct lib_sostream_s *self,
off_t offset, int whence)
{
FAR struct lib_mtdsostream_s *stream =
(FAR struct lib_mtdsostream_s *)self;
FAR struct mtd_dev_s *mtd = stream->inode->u.i_mtd;
size_t erasesize = stream->geo.erasesize;
off_t streamsize = erasesize * stream->geo.neraseblocks;
size_t nblkpererase = erasesize / stream->geo.blocksize;
size_t block;
off_t ret;
switch (whence)
{
case SEEK_SET:
break;
case SEEK_END:
offset += streamsize;
break;
case SEEK_CUR:
offset += self->nput;
break;
default:
return -ENOTSUP;
}
if (offset < 0 || offset > streamsize)
{
return -EINVAL;
}
if (self->nput % erasesize)
{
block = self->nput / erasesize;
if (offset >= block * erasesize &&
offset < (block + 1) * erasesize)
{
goto out;
}
ret = MTD_ERASE(mtd, block, 1);
if (ret < 0)
{
return ret;
}
ret = MTD_BWRITE(mtd, block * nblkpererase,
nblkpererase, stream->cache);
if (ret < 0)
{
return ret;
}
}
if (offset % erasesize)
{
block = offset / erasesize;
ret = MTD_BREAD(mtd, block * nblkpererase,
nblkpererase, stream->cache);
if (ret < 0)
{
return ret;
}
}
out:
self->nput = offset;
return offset;
}
* Public Functions
****************************************************************************/
* Name: lib_mtdsostream_close
*
* Description:
* close mtd driver stream backend
*
* Input Parameters:
* stream - User allocated, uninitialized instance of struct
* lib_mtdsostream_s to be initialized.
*
* Returned Value:
* None (User allocated instance initialized).
*
****************************************************************************/
void lib_mtdsostream_close(FAR struct lib_mtdsostream_s *stream)
{
if (stream != NULL)
{
if (stream->cache != NULL)
{
mtdsostream_flush(&stream->common);
lib_free(stream->cache);
stream->cache = NULL;
}
if (stream->inode != NULL)
{
close_mtddriver(stream->inode);
stream->inode = NULL;
}
}
}
* Name: lib_mtdsostream_open
*
* Description:
* mtd driver stream backend
*
* Input Parameters:
* stream - User allocated, uninitialized instance of struct
* lib_mtdsostream_s to be initialized.
* name - The full path of mtd device.
*
* Returned Value:
* Returns zero on success or a negated errno on failure
*
****************************************************************************/
int lib_mtdsostream_open(FAR struct lib_mtdsostream_s *stream,
FAR const char *name)
{
FAR struct inode *node = NULL;
int ret;
if (stream == NULL || name == NULL)
{
return -EINVAL;
}
ret = find_mtddriver(name, &node);
if (ret < 0)
{
return ret;
}
memset(stream, 0, sizeof(*stream));
if (node->u.i_mtd->ioctl == NULL ||
node->u.i_mtd->erase == NULL ||
node->u.i_mtd->bwrite == NULL ||
node->u.i_mtd->ioctl(node->u.i_mtd, MTDIOC_GEOMETRY,
(unsigned long)&stream->geo) < 0 ||
stream->geo.blocksize <= 0 ||
stream->geo.erasesize <= 0 ||
stream->geo.neraseblocks <= 0)
{
close_mtddriver(node);
return -EINVAL;
}
stream->cache = lib_malloc(stream->geo.erasesize);
if (stream->cache == NULL)
{
close_mtddriver(node);
return -ENOMEM;
}
stream->inode = node;
stream->common.putc = mtdsostream_putc;
stream->common.puts = mtdsostream_puts;
stream->common.flush = mtdsostream_flush;
stream->common.seek = mtdsostream_seek;
return OK;
}
#endif