28739b8b8a
Signed-off-by: 田昕 <tianxin7@xiaomi.com>
302 lines
8.6 KiB
C
302 lines
8.6 KiB
C
/****************************************************************************
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* libs/libc/stream/lib_mtdoutstream.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <unistd.h>
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#include <nuttx/streams.h>
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#include <nuttx/fs/fs.h>
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#include <nuttx/mtd/mtd.h>
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#include "libc.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#if !defined(CONFIG_DISABLE_MOUNTPOINT) && defined(CONFIG_MTD)
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: mtdoutstream_flush
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****************************************************************************/
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static int mtdoutstream_flush(FAR struct lib_outstream_s *this)
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{
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FAR struct lib_mtdoutstream_s *stream =
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(FAR struct lib_mtdoutstream_s *)this;
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size_t erasesize = stream->geo.erasesize;
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size_t nblkpererase = erasesize / stream->geo.blocksize;
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int ret = OK;
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if (this->nput % erasesize > 0)
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{
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#ifdef CONFIG_MTD_BYTE_WRITE
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/* if byte write, flush won't be needed */
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if (stream->inode->u.i_mtd->write == NULL)
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#endif
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{
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ret = MTD_ERASE(stream->inode->u.i_mtd, this->nput / erasesize, 1);
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if (ret < 0)
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{
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return ret;
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}
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ret = MTD_BWRITE(stream->inode->u.i_mtd,
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this->nput / erasesize * nblkpererase,
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nblkpererase, stream->cache);
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}
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}
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return ret;
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}
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/****************************************************************************
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* Name: mtdoutstream_puts
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****************************************************************************/
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static int mtdoutstream_puts(FAR struct lib_outstream_s *this,
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FAR const void *buf, int len)
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{
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FAR struct lib_mtdoutstream_s *stream =
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(FAR struct lib_mtdoutstream_s *)this;
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size_t erasesize = stream->geo.erasesize;
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size_t nblkpererase = erasesize / stream->geo.blocksize;
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FAR struct inode *inode = stream->inode;
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FAR const unsigned char *ptr = buf;
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size_t remain = len;
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int ret;
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if (this->nput + len > erasesize * stream->geo.neraseblocks)
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{
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return -ENOSPC;
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}
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#ifdef CONFIG_MTD_BYTE_WRITE
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if (stream->inode->u.i_mtd->write != NULL)
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{
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if (this->nput % stream->geo.erasesize == 0)
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{
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ret = MTD_ERASE(inode->u.i_mtd,
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this->nput / stream->geo.erasesize, 1);
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if (ret < 0)
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{
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return ret;
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}
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}
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ret = MTD_WRITE(inode->u.i_mtd, this->nput, len, buf);
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if (ret < 0)
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{
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return ret;
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}
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this->nput += len;
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}
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else
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#endif
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{
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while (remain > 0)
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{
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size_t sblock = this->nput / erasesize;
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size_t offset = this->nput % erasesize;
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if (offset > 0)
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{
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size_t copyin = offset + remain > erasesize ?
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erasesize - offset : remain;
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memcpy(stream->cache + offset, ptr, copyin);
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ptr += copyin;
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offset += copyin;
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this->nput += copyin;
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remain -= copyin;
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if (offset == erasesize)
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{
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ret = MTD_ERASE(inode->u.i_mtd, sblock, 1);
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if (ret < 0)
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{
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return ret;
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}
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ret = MTD_BWRITE(inode->u.i_mtd, sblock * nblkpererase,
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nblkpererase, stream->cache);
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if (ret < 0)
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{
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return ret;
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}
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}
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}
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else if (remain < erasesize)
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{
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/* erase content to all 0 before caching,
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* so no random content will be flushed
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*/
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memset(stream->cache, 0, stream->geo.erasesize);
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memcpy(stream->cache, ptr, remain);
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this->nput += remain;
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remain = 0;
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}
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else if (remain >= erasesize)
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{
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size_t copyin = (remain / erasesize) * erasesize;
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ret = MTD_ERASE(inode->u.i_mtd, sblock,
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remain / erasesize);
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if (ret < 0)
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{
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return ret;
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}
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ret = MTD_BWRITE(inode->u.i_mtd, sblock * nblkpererase,
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remain / erasesize * nblkpererase,
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ptr);
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if (ret < 0)
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{
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return ret;
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}
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ptr += copyin;
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this->nput += copyin;
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remain -= copyin;
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}
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}
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}
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return len;
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: lib_mtdoutstream_close
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*
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* Description:
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* close mtd driver stream backend
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*
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* Input Parameters:
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* stream - User allocated, uninitialized instance of struct
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* lib_mtdoutstream_s to be initialized.
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*
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* Returned Value:
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* None (User allocated instance initialized).
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*
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****************************************************************************/
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void lib_mtdoutstream_close(FAR struct lib_mtdoutstream_s *stream)
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{
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if (stream != NULL)
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{
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if (stream->inode != NULL)
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{
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close_mtddriver(stream->inode);
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stream->inode = NULL;
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}
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if (stream->cache != NULL)
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{
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lib_free(stream->cache);
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stream->cache = NULL;
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}
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}
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}
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/****************************************************************************
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* Name: lib_mtdoutstream_open
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*
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* Description:
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* mtd driver stream backend
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*
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* Input Parameters:
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* stream - User allocated, uninitialized instance of struct
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* lib_mtdoutstream_s to be initialized.
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* name - The full path of mtd device.
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*
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* Returned Value:
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* Returns zero on success or a negated errno on failure
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*
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****************************************************************************/
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int lib_mtdoutstream_open(FAR struct lib_mtdoutstream_s *stream,
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FAR const char *name)
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{
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FAR struct inode *node = NULL;
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int ret;
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if (stream == NULL || name == NULL)
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{
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return -EINVAL;
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}
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ret = find_mtddriver(name, &node);
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if (ret < 0)
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{
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return ret;
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}
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memset(stream, 0, sizeof(*stream));
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if (node->u.i_mtd->ioctl == NULL ||
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node->u.i_mtd->erase == NULL ||
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node->u.i_mtd->bwrite == NULL ||
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node->u.i_mtd->ioctl(node->u.i_mtd, MTDIOC_GEOMETRY,
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(unsigned long)&stream->geo) < 0 ||
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stream->geo.blocksize <= 0 ||
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stream->geo.erasesize <= 0 ||
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stream->geo.neraseblocks <= 0)
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{
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close_mtddriver(node);
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return -EINVAL;
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}
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#ifdef CONFIG_MTD_BYTE_WRITE
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if (node->u.i_mtd->write == NULL)
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#endif
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{
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stream->cache = lib_zalloc(stream->geo.erasesize);
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if (stream->cache == NULL)
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{
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close_mtddriver(node);
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return -ENOMEM;
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}
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}
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stream->inode = node;
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stream->public.puts = mtdoutstream_puts;
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stream->public.flush = mtdoutstream_flush;
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return OK;
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}
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#endif /* CONFIG_MTD */
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