Module: xenomai-head
Branch: master
Commit: e1ea047421db1c4008b7073af344477494b3eb2b
URL:
http://git.xenomai.org/?p=xenomai-head.git;a=commit;h=e1ea047421db1c4008b7073af344477494b3eb2b
Author: Philippe Gerum <r...@xenomai.org>
Date: Sat Sep 5 23:47:08 2009 +0200
rtdm: introduce device context <-> private area accessors
Introduce rtdm_context_to_private() and rtdm_private_to_context()
accessors, returning the private area associated with a device context
structure, and conversely.
---
include/rtdm/rtdm_driver.h | 28 ++++++++++++++++++++++++++++
1 files changed, 28 insertions(+), 0 deletions(-)
diff --git a/include/rtdm/rtdm_driver.h b/include/rtdm/rtdm_driver.h
index 7f1f3f8..ea543c1 100644
--- a/include/rtdm/rtdm_driver.h
+++ b/include/rtdm/rtdm_driver.h
@@ -405,6 +405,34 @@ struct rtdm_dev_context {
char dev_private[0];
};
+/**
+ * Locate the driver private area associated to a device context structure
+ *
+ * @param[in] context Context structure associated with opened device instance
+ *
+ * @return The address of the private driver area associated to @a
+ * context.
+ */
+static inline void *
+rtdm_context_to_private(struct rtdm_dev_context *context)
+{
+ return (void *)context->dev_private;
+}
+
+/**
+ * Locate a device context structure from its driver private area
+ *
+ * @param[in] dev_private Address of a private context area
+ *
+ * @return The address of the device context structure defining @a
+ * dev_private.
+ */
+static inline struct rtdm_dev_context *
+rtdm_private_to_context(void *dev_private)
+{
+ return container_of(dev_private, struct rtdm_dev_context, dev_private);
+}
+
struct rtdm_dev_reserved {
struct list_head entry;
atomic_t refcount;
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