sysfs: Add attribute array to sysdev classes

Add a attribute array that is automatically registered and unregistered
to struct sysdev_class. This is similar to what struct class has.

A lot of drivers add list of attributes, so it's better to do
this easily in the common sysdev layer.

This adds a new field to struct sysdev_class. I audited the
whole tree and there are no dynamically allocated sysdev classes,
so this is fully compatible.

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/base/sys.c b/drivers/base/sys.c
index a38445c..747c99e 100644 (file)
--- a/drivers/base/sys.c
+++ b/drivers/base/sys.c
@@ -145,13 +145,20 @@ int sysdev_class_register(struct sysdev_class *cls)
        if (retval)
                return retval;
 
-       return kset_register(&cls->kset);
+       retval = kset_register(&cls->kset);
+       if (!retval && cls->attrs)
+               retval = sysfs_create_files(&cls->kset.kobj,
+                                           (const struct attribute **)cls->attrs);
+       return retval;
 }
 
 void sysdev_class_unregister(struct sysdev_class *cls)
 {
        pr_debug("Unregistering sysdev class '%s'\n",
                 kobject_name(&cls->kset.kobj));
+       if (cls->attrs)
+               sysfs_remove_files(&cls->kset.kobj,
+                                  (const struct attribute **)cls->attrs);
        kset_unregister(&cls->kset);
 }
 

diff --git a/include/linux/sysdev.h b/include/linux/sysdev.h
index c2458fa..b6244f9 100644 (file)
--- a/include/linux/sysdev.h
+++ b/include/linux/sysdev.h
@@ -27,10 +27,12 @@
 
 
 struct sys_device;
+struct sysdev_class_attribute;
 
 struct sysdev_class {
        const char *name;
        struct list_head        drivers;
+       struct sysdev_class_attribute **attrs;
 
        /* Default operations for these types of devices */
        int     (*shutdown)(struct sys_device *);