From cde81697d12417a8d23655997fdf209a3d6bc417 Mon Sep 17 00:00:00 2001 From: patacongo Date: Sat, 15 Nov 2008 00:14:05 +0000 Subject: Block-to-character driver git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@1235 42af7a65-404d-4744-a932-0658087f49c3 --- nuttx/drivers/bch/bchlib_setup.c | 160 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 160 insertions(+) create mode 100644 nuttx/drivers/bch/bchlib_setup.c (limited to 'nuttx/drivers/bch/bchlib_setup.c') diff --git a/nuttx/drivers/bch/bchlib_setup.c b/nuttx/drivers/bch/bchlib_setup.c new file mode 100644 index 000000000..35520ad3b --- /dev/null +++ b/nuttx/drivers/bch/bchlib_setup.c @@ -0,0 +1,160 @@ +/**************************************************************************** + * drivers/bch/bchlib_setup.c + * + * Copyright (C) 2008 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt + * + * 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. + * + ****************************************************************************/ + +/**************************************************************************** + * Compilation Switches + ****************************************************************************/ + +/**************************************************************************** + * Included Files + ****************************************************************************/ + +#include + +#include +#include + +#include +#include +#include +#include + +#include + +#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, boolean 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*)zalloc(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 ubyte *)malloc(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: + free(bch); + return ret; +} -- cgit v1.2.3