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- /****************************************************************************
- * drivers/bch/bchdev_driver.c
- *
- * Copyright (C) 2008-2009 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.
- *
- ****************************************************************************/
- /****************************************************************************
- * Compilation Switches
- ****************************************************************************/
- /****************************************************************************
- * Included Files
- ****************************************************************************/
- #include <nuttx/config.h>
- #include <sys/types.h>
- #include <sys/stat.h>
- #include <sys/ioctl.h>
- #include <unistd.h>
- #include <string.h>
- #include <fcntl.h>
- #include <sched.h>
- #include <errno.h>
- #include <assert.h>
- #include <debug.h>
- #include <nuttx/fs/fs.h>
- #include <nuttx/fs/ioctl.h>
- #include "bch_internal.h"
- /****************************************************************************
- * Definitions
- ****************************************************************************/
- /****************************************************************************
- * Private Function Prototypes
- ****************************************************************************/
- static int bch_open(FAR struct file *filp);
- static int bch_close(FAR struct file *filp);
- static ssize_t bch_read(FAR struct file *, FAR char *, size_t);
- static ssize_t bch_write(FAR struct file *, FAR const char *, size_t);
- static int bch_ioctl(FAR struct file *filp, int cmd, unsigned long arg);
- /****************************************************************************
- * Public Data
- ****************************************************************************/
- const struct file_operations bch_fops =
- {
- bch_open, /* open */
- bch_close, /* close */
- bch_read, /* read */
- bch_write, /* write */
- 0, /* seek */
- bch_ioctl /* ioctl */
- #ifndef CONFIG_DISABLE_POLL
- , 0 /* poll */
- #endif
- };
- /****************************************************************************
- * Private Functions
- ****************************************************************************/
- /****************************************************************************
- * Name: bch_open
- *
- * Description: Open the block device
- *
- ****************************************************************************/
- static int bch_open(FAR struct file *filp)
- {
- FAR struct inode *inode = filp->f_inode;
- FAR struct bchlib_s *bch;
- DEBUGASSERT(inode && inode->i_private);
- bch = (FAR struct bchlib_s *)inode->i_private;
- /* Increment the reference count */
- bchlib_semtake(bch);
- if (bch->refs == MAX_OPENCNT)
- {
- return -EMFILE;
- }
- else
- {
- bch->refs++;
- }
- bchlib_semgive(bch);
- return OK;
- }
- /****************************************************************************
- * Name: bch_close
- *
- * Description: close the block device
- *
- ****************************************************************************/
- static int bch_close(FAR struct file *filp)
- {
- FAR struct inode *inode = filp->f_inode;
- FAR struct bchlib_s *bch;
- int ret = OK;
- DEBUGASSERT(inode && inode->i_private);
- bch = (FAR struct bchlib_s *)inode->i_private;
- /* Flush any dirty pages remaining in the cache */
- bchlib_semtake(bch);
- (void)bchlib_flushsector(bch);
- /* Decrement the reference count (I don't use bchlib_decref() because I
- * want the entire close operation to be atomic wrt other driver operations.
- */
- if (bch->refs == 0)
- {
- ret = -EIO;
- }
- else
- {
- bch->refs--;
- }
- bchlib_semgive(bch);
- return ret;
- }
- /****************************************************************************
- * Name:bch_read
- ****************************************************************************/
- static ssize_t bch_read(FAR struct file *filp, FAR char *buffer, size_t len)
- {
- FAR struct inode *inode = filp->f_inode;
- FAR struct bchlib_s *bch;
- int ret;
- DEBUGASSERT(inode && inode->i_private);
- bch = (FAR struct bchlib_s *)inode->i_private;
- bchlib_semtake(bch);
- ret = bchlib_read(bch, buffer, filp->f_pos, len);
- if (ret > 0)
- {
- filp->f_pos += len;
- }
- bchlib_semgive(bch);
- return ret;
- }
- /****************************************************************************
- * Name:bch_write
- ****************************************************************************/
- static ssize_t bch_write(FAR struct file *filp, FAR const char *buffer, size_t len)
- {
- FAR struct inode *inode = filp->f_inode;
- FAR struct bchlib_s *bch;
- int ret = -EACCES;
- DEBUGASSERT(inode && inode->i_private);
- bch = (FAR struct bchlib_s *)inode->i_private;
- if (!bch->readonly)
- {
- bchlib_semtake(bch);
- ret = bchlib_write(bch, buffer, filp->f_pos, len);
- if (ret > 0)
- {
- filp->f_pos += len;
- }
- bchlib_semgive(bch);
- }
- return ret;
- }
- /****************************************************************************
- * Name: bch_ioctl
- *
- * Description: Return device geometry
- *
- ****************************************************************************/
- static int bch_ioctl(FAR struct file *filp, int cmd, unsigned long arg)
- {
- FAR struct inode *inode = filp->f_inode;
- FAR struct bchlib_s *bch;
- int ret = -ENOTTY;
- DEBUGASSERT(inode && inode->i_private);
- bch = (FAR struct bchlib_s *)inode->i_private;
- if (cmd == DIOC_GETPRIV)
- {
- FAR struct bchlib_s **bchr = (FAR struct bchlib_s **)((uintptr_t)arg);
- bchlib_semtake(bch);
- if (!bchr && bch->refs < 255)
- {
- ret = -EINVAL;
- }
- else
- {
- bch->refs++;
- *bchr = bch;
- }
- bchlib_semgive(bch);
- }
- return ret;
- }
- /****************************************************************************
- * Public Functions
- ****************************************************************************/
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