px4-firmware/nuttx/drivers/bch/bchlib_setup.c

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/****************************************************************************
* drivers/bch/bchlib_setup.c
*
* Copyright (C) 2008-2009, 2011 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* 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.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* 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.
*
****************************************************************************/
/****************************************************************************
* 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_internal.h"
/****************************************************************************
* Private Types
****************************************************************************/
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* 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*)kzalloc(sizeof(struct bchlib_s));
if (!bch)
{
fdbg("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)
{
fdbg("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)
{
fdbg("geometry failed: %d\n", -ret);
goto errout_with_bch;
}
if (!geo.geo_available)
{
fdbg("geometry failed: %d\n", -ret);
ret = -ENODEV;
goto errout_with_bch;
}
if (!readonly && (!bch->inode->u.i_bops->write || !geo.geo_writeenabled))
{
fdbg("write access not supported\n");
ret = -EACCES;
goto errout_with_bch;
}
/* Save the geometry info and complete initialization of the structure */
sem_init(&bch->sem, 0, 1);
bch->nsectors = geo.geo_nsectors;
bch->sectsize = geo.geo_sectorsize;
bch->sector = (size_t)-1;
bch->readonly = readonly;
/* Allocate the sector I/O buffer */
bch->buffer = (FAR uint8_t *)kmalloc(bch->sectsize);
if (!bch->buffer)
{
fdbg("Failed to allocate sector buffer\n");
ret = -ENOMEM;
goto errout_with_bch;
}
*handle = bch;
return OK;
errout_with_bch:
kfree(bch);
return ret;
}