Block-to-character driver

git-svn-id: https://nuttx.svn.sourceforge.net/svnroot/nuttx/trunk@1235 7fd9a85b-ad96-42d3-883c-3090e2eb8679

1 files changed, 118 insertions, 0 deletions

diff --git a/nuttx/drivers/bch/bchlib_teardown.c b/nuttx/drivers/bch/bchlib_teardown.c
new file mode 100644
index 0000000000..9580d24e4b
--- /dev/null
+++ b/nuttx/drivers/bch/bchlib_teardown.c
@@ -0,0 +1,118 @@
+/****************************************************************************
+ * drivers/bch/bchlib_teardown.c
+ *
+ *   Copyright (C) 2008 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ * 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 <stdlib.h>
+#include <errno.h>
+#include <assert.h>
+#include <debug.h>
+
+#include <nuttx/fs.h>
+
+#include "bch_internal.h"
+
+/****************************************************************************
+ * Private Types
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: bchlib_teardown
+ *
+ * Description:
+ *   Setup so that the block driver referenced by 'blkdev' can be accessed
+ *   similar to a character device.
+ *
+ ****************************************************************************/
+
+int bchlib_teardown(FAR void *handle)
+{
+  FAR struct bchlib_s *bch = (FAR struct bchlib_s *)handle;
+
+  DEBUGASSERT(handle);
+
+  /* Check that there are not outstanding reference counts on the object */
+
+  if (bch->refs > 0)
+    {
+      return -EBUSY;
+    }
+
+  /* Flush any pending data to the block driver */
+
+  bchlib_flushsector(bch);
+
+  /* Close the block driver */
+
+  (void)close_blockdriver(bch->inode);
+
+  /* Free the BCH state structure */
+
+  if (bch->buffer)
+    {
+      free(bch->buffer);
+    }
+
+  sem_destroy(&bch->sem);
+  free(bch);
+  return OK;
+}
+