[Driver Model] Consolidate attribute definition macros

- Create __ATTR(), __ATTR_RO(), and __ATTR_NULL macros to help define 
  attributes in a neat, short-hand form. 

- Apply these macros to the attribute definition in include/linux/device.h

- Note: These can be used to more cleanly define attributes in your own
  code. e.g: 

	static struct device_attribute attrs[] = {
		__ATTR_RO(foo),
		__ATTR_RO(bar),
		__ATTR(baz,0666,baz_show,baz_store),
		__ATTR_NULL,
	};

  ...etc. 
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>

include/linux/device.h

@@ -90,11 +90,7 @@ struct bus_attribute {
 };
 
 #define BUS_ATTR(_name,_mode,_show,_store)	\
-struct bus_attribute bus_attr_##_name = { 		\
-	.attr = {.name = __stringify(_name), .mode = _mode, .owner = THIS_MODULE },	\
-	.show	= _show,				\
-	.store	= _store,				\
-};
+struct bus_attribute bus_attr_##_name = __ATTR(_name,_mode,_show,_store)
 
 extern int bus_create_file(struct bus_type *, struct bus_attribute *);
 extern void bus_remove_file(struct bus_type *, struct bus_attribute *);
@@ -131,11 +127,7 @@ struct driver_attribute {
 };
 
 #define DRIVER_ATTR(_name,_mode,_show,_store)	\
-struct driver_attribute driver_attr_##_name = { 		\
-	.attr = {.name = __stringify(_name), .mode = _mode, .owner = THIS_MODULE },	\
-	.show	= _show,				\
-	.store	= _store,				\
-};
+struct driver_attribute driver_attr_##_name = __ATTR(_name,_mode,_show,_store)
 
 extern int driver_create_file(struct device_driver *, struct driver_attribute *);
 extern void driver_remove_file(struct device_driver *, struct driver_attribute *);
@@ -172,11 +164,7 @@ struct class_attribute {
 };
 
 #define CLASS_ATTR(_name,_mode,_show,_store)			\
-struct class_attribute class_attr_##_name = { 			\
-	.attr = {.name = __stringify(_name), .mode = _mode, .owner = THIS_MODULE },	\
-	.show	= _show,					\
-	.store	= _store,					\
-};
+struct class_attribute class_attr_##_name = __ATTR(_name,_mode,_show,_store) 
 
 extern int class_create_file(struct class *, const struct class_attribute *);
 extern void class_remove_file(struct class *, const struct class_attribute *);
@@ -224,11 +212,8 @@ struct class_device_attribute {
 };
 
 #define CLASS_DEVICE_ATTR(_name,_mode,_show,_store)		\
-struct class_device_attribute class_device_attr_##_name = { 	\
-	.attr = {.name = __stringify(_name), .mode = _mode, .owner = THIS_MODULE },	\
-	.show	= _show,					\
-	.store	= _store,					\
-};
+struct class_device_attribute class_device_attr_##_name = 	\
+	__ATTR(_name,_mode,_show,_store)
 
 extern int class_device_create_file(struct class_device *, 
 				    const struct class_device_attribute *);
@@ -342,11 +327,7 @@ struct device_attribute {
 };
 
 #define DEVICE_ATTR(_name,_mode,_show,_store) \
-struct device_attribute dev_attr_##_name = { 		\
-	.attr = {.name = __stringify(_name), .mode = _mode, .owner = THIS_MODULE },	\
-	.show	= _show,				\
-	.store	= _store,				\
-};
+struct device_attribute dev_attr_##_name = __ATTR(_name,_mode,_show,_store)
 
 
 extern int device_create_file(struct device *device, struct device_attribute * entry);

include/linux/sysfs.h

@@ -24,6 +24,27 @@ struct attribute_group {
 };
 
 
+
+/**
+ * Use these macros to make defining attributes easier. See include/linux/device.h
+ * for examples..
+ */
+
+#define __ATTR(_name,_mode,_show,_store) { \
+	.attr = {.name = __stringify(_name), .mode = _mode, .owner = THIS_MODULE },	\
+	.show	= _show,					\
+	.store	= _store,					\
+}
+
+#define __ATTR_RO(_name) { \
+	.attr	= { .name = __stringify(_name), .mode = 0444, .owner = THIS_MODULE },	\
+	.show	= _name##_show,	\
+}
+
+#define __ATTR_NULL { .attr = { .name = NULL } }
+
+
+
 struct bin_attribute {
 	struct attribute	attr;
 	size_t			size;