Block-to-character driver

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@1235 42af7a65-404d-4744-a932-0658087f49c3

1 files changed, 211 insertions, 0 deletions

diff --git a/nuttx/drivers/bch/bchdev_driver.c b/nuttx/drivers/bch/bchdev_driver.c
new file mode 100644
index 000000000..33e26032f
--- /dev/null
+++ b/nuttx/drivers/bch/bchdev_driver.c
@@ -0,0 +1,211 @@
+/****************************************************************************
+ * drivers/bch/bchdev_driver.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 <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.h>
+#include <nuttx/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
+ ****************************************************************************/
+
+struct file_operations bch_fops =
+{
+  bch_open,  /* open */
+  bch_close, /* close */
+  bch_read,  /* read */
+  bch_write, /* write */
+  0,         /* seek */
+  bch_ioctl  /* ioctl */
+};
+
+/****************************************************************************
+ * 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;
+
+  DEBUGASSERT(inode && inode->i_private);
+  return bchlib_incref((FAR struct bchlib_s *)inode->i_private);
+}
+
+/****************************************************************************
+ * Name: bch_close
+ *
+ * Description: close the block device
+ *
+ ****************************************************************************/
+
+static int bch_close(FAR struct file *filp)
+{
+  FAR struct inode *inode = filp->f_inode;
+
+  DEBUGASSERT(inode && inode->i_private);
+  return bchlib_decref((FAR struct bchlib_s *)inode->i_private);
+}
+
+/****************************************************************************
+ * 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 **)arg;
+
+      if (!bchr)
+        {
+          ret = -EINVAL;
+        }
+      else
+        {
+          ret = bchlib_incref(bch);
+          *bchr = bch;
+        }
+    }
+
+  return ret;
+}
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/