120 lines
3.4 KiB
C
120 lines
3.4 KiB
C
/****************************************************************************
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* drivers/bch/bchlib_setup.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 <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 <nuttx/drivers/drivers.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 = 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 &&
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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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nxmutex_init(&bch->lock);
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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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*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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