incubator-nuttx/drivers/bch/bchlib_setup.c

134 lines
3.7 KiB
C

/****************************************************************************
* drivers/bch/bchlib_setup.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 <sys/types.h>
#include <sys/mount.h>
#include <stdint.h>
#include <stdbool.h>
#include <stdlib.h>
#include <errno.h>
#include <assert.h>
#include <debug.h>
#include <nuttx/kmalloc.h>
#include <nuttx/fs/fs.h>
#include "bch.h"
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: bchlib_setup
*
* Description:
* Setup so that the block driver referenced by 'blkdev' can be accessed
* similar to a character device.
*
****************************************************************************/
int bchlib_setup(const char *blkdev, bool readonly, FAR void **handle)
{
FAR struct bchlib_s *bch;
struct geometry geo;
int ret;
DEBUGASSERT(blkdev);
/* Allocate the BCH state structure */
bch = (FAR struct bchlib_s *)kmm_zalloc(sizeof(struct bchlib_s));
if (!bch)
{
ferr("ERROR: Failed to allocate BCH structure\n");
return -ENOMEM;
}
/* Open the block driver */
ret = open_blockdriver(blkdev, readonly ? MS_RDONLY : 0, &bch->inode);
if (ret < 0)
{
ferr("ERROR: Failed to open driver %s: %d\n", blkdev, -ret);
goto errout_with_bch;
}
DEBUGASSERT(bch->inode && bch->inode->u.i_bops &&
bch->inode->u.i_bops->geometry);
ret = bch->inode->u.i_bops->geometry(bch->inode, &geo);
if (ret < 0)
{
ferr("ERROR: geometry failed: %d\n", -ret);
goto errout_with_bch;
}
if (!geo.geo_available)
{
ferr("ERROR: geometry failed: %d\n", -ret);
ret = -ENODEV;
goto errout_with_bch;
}
if (!readonly && (!bch->inode->u.i_bops->write || !geo.geo_writeenabled))
{
ferr("ERROR: write access not supported\n");
ret = -EACCES;
goto errout_with_bch;
}
/* Save the geometry info and complete initialization of the structure */
nxmutex_init(&bch->lock);
bch->nsectors = geo.geo_nsectors;
bch->sectsize = geo.geo_sectorsize;
bch->sector = (size_t)-1;
bch->readonly = readonly;
/* Allocate the sector I/O buffer */
#if CONFIG_BCH_BUFFER_ALIGNMENT != 0
bch->buffer = kmm_memalign(CONFIG_BCH_BUFFER_ALIGNMENT, bch->sectsize);
#else
bch->buffer = kmm_malloc(bch->sectsize);
#endif
if (!bch->buffer)
{
ferr("ERROR: Failed to allocate sector buffer\n");
ret = -ENOMEM;
goto errout_with_bch;
}
*handle = bch;
return OK;
errout_with_bch:
kmm_free(bch);
return ret;
}