144 lines
4.4 KiB
C
144 lines
4.4 KiB
C
/****************************************************************************
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* drivers/bch/bchlib_setup.c
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*
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* Copyright (C) 2008-2009, 2011, 2016 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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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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*
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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
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* 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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****************************************************************************/
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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 <sys/types.h>
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#include <sys/mount.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <assert.h>
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#include <debug.h>
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#include <nuttx/kmalloc.h>
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#include <nuttx/fs/fs.h>
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#include "bch.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: bchlib_setup
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*
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* Description:
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* Setup so that the block driver referenced by 'blkdev' can be accessed
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* similar to a character device.
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*
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****************************************************************************/
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int bchlib_setup(const char *blkdev, bool readonly, FAR void **handle)
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{
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FAR struct bchlib_s *bch;
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struct geometry geo;
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int ret;
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DEBUGASSERT(blkdev);
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/* Allocate the BCH state structure */
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bch = (FAR struct bchlib_s *)kmm_zalloc(sizeof(struct bchlib_s));
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if (!bch)
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{
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ferr("ERROR: Failed to allocate BCH structure\n");
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return -ENOMEM;
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}
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/* Open the block driver */
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ret = open_blockdriver(blkdev, readonly ? MS_RDONLY : 0, &bch->inode);
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if (ret < 0)
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{
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ferr("ERROR: Failed to open driver %s: %d\n", blkdev, -ret);
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goto errout_with_bch;
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}
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DEBUGASSERT(bch->inode && bch->inode->u.i_bops && bch->inode->u.i_bops->geometry);
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ret = bch->inode->u.i_bops->geometry(bch->inode, &geo);
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if (ret < 0)
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{
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ferr("ERROR: geometry failed: %d\n", -ret);
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goto errout_with_bch;
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}
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if (!geo.geo_available)
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{
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ferr("ERROR: geometry failed: %d\n", -ret);
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ret = -ENODEV;
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goto errout_with_bch;
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}
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if (!readonly && (!bch->inode->u.i_bops->write || !geo.geo_writeenabled))
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{
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ferr("ERROR: write access not supported\n");
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ret = -EACCES;
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goto errout_with_bch;
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}
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/* Save the geometry info and complete initialization of the structure */
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sem_init(&bch->sem, 0, 1);
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bch->nsectors = geo.geo_nsectors;
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bch->sectsize = geo.geo_sectorsize;
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bch->sector = (size_t)-1;
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bch->readonly = readonly;
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/* Allocate the sector I/O buffer */
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bch->buffer = (FAR uint8_t *)kmm_malloc(bch->sectsize);
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if (!bch->buffer)
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{
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ferr("ERROR: Failed to allocate sector buffer\n");
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ret = -ENOMEM;
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goto errout_with_bch;
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}
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*handle = bch;
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return OK;
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errout_with_bch:
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kmm_free(bch);
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return ret;
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}
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