[PATCH] Driver Core: Allow sysdev_class have attributes

allow sysdev_class adding attribute. Next patch will use the new API to
add an attribute under /sys/device/system/cpu/.

Signed-off-by: Shaohua Li <shaohua.li@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 17 insertions, 1 deletions

diff --git a/include/linux/sysdev.h b/include/linux/sysdev.h
index 2a4b432e1176..166a2e58c287 100644
--- a/include/linux/sysdev.h
+++ b/include/linux/sysdev.h
@@ -37,11 +37,27 @@ struct sysdev_class {
         struct kset             kset;
 };
 
+struct sysdev_class_attribute {
+        struct attribute attr;
+        ssize_t (*show)(struct sysdev_class *, char *);
+        ssize_t (*store)(struct sysdev_class *, const char *, size_t);
+};
+
+#define SYSDEV_CLASS_ATTR(_name,_mode,_show,_store)             \
+struct sysdev_class_attribute attr_##_name = {                  \
+        .attr = {.name = __stringify(_name), .mode = _mode },   \
+        .show   = _show,                                        \
+        .store  = _store,                                       \
+};
+
 
 extern int sysdev_class_register(struct sysdev_class *);
 extern void sysdev_class_unregister(struct sysdev_class *);
 
-
+extern int sysdev_class_create_file(struct sysdev_class *,
+        struct sysdev_class_attribute *);
+extern void sysdev_class_remove_file(struct sysdev_class *,
+        struct sysdev_class_attribute *);
 /**
  * Auxillary system device drivers.
  */