Add QE support to STM32F4Discovery; add a test of the quadrature encoder driver

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@4395 42af7a65-404d-4744-a932-0658087f49c3

1 files changed, 33 insertions, 15 deletions

diff --git a/nuttx/fs/fs_registerblockdriver.c b/nuttx/fs/fs_registerblockdriver.c
index 248e3e2a7..bd5c08be4 100644
--- a/nuttx/fs/fs_registerblockdriver.c
+++ b/nuttx/fs/fs_registerblockdriver.c
@@ -1,8 +1,8 @@
 /****************************************************************************
  * fs/fs_registerblockdriver.c
  *
- *   Copyright (C) 2007-2009 Gregory Nutt. All rights reserved.
- *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *   Copyright (C) 2007-2009, 2012 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
@@ -65,27 +65,45 @@
 
 /****************************************************************************
  * Name: register_driver
+ *
+ * Description:
+ *   Register a block driver inode the pseudo file system.
+ *
+ * Input parameters:
+ *   path - The path to the inode to create
+ *   bops - The block driver operations structure
+ *   mode - inmode priviledges (not used)
+ *   priv - Private, user data that will be associated with the inode.
+ *
+ * Returned Value:
+ *   Zero on success (with the inode point in 'inode'); A negated errno
+ *   value is returned on a failure (all error values returned by
+ *   inode_reserve):
+ *
+ *   EINVAL - 'path' is invalid for this operation
+ *   EEXIST - An inode already exists at 'path'
+ *   ENOMEM - Failed to allocate in-memory resources for the operation
+ *
  ****************************************************************************/
 
-int register_blockdriver(const char *path,
-                            const struct block_operations *bops,
-                            mode_t mode, void *priv)
+int register_blockdriver(FAR const char *path,
+                         FAR const struct block_operations *bops,
+                         mode_t mode, FAR void *priv)
 {
-  struct inode *node;
-  int ret = -ENOMEM;
+  FAR struct inode *node;
+  int ret;
 
-  /* Insert an inode for the device driver -- we need to hold the inode semaphore
-   * to prevent access to the tree while we this.  This is because we will have a
-   * momentarily bad true until we populate the inode with valid data.
+  /* Insert an inode for the device driver -- we need to hold the inode
+   * semaphore to prevent access to the tree while we this.  This is because
+   * we will have a momentarily bad true until we populate the inode with
+   * valid data.
    */
 
   inode_semtake();
-  node = inode_reserve(path);
-  if (node != NULL)
+  ret = inode_reserve(path, &node);
+  if (ret >= 0)
     {
-      /* We have it, now populate it with block driver specific
-       * information.
-       */
+      /* We have it, now populate it with block driver specific information. */
 
       INODE_SET_BLOCK(node);