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sysfs: Add attribute array to sysdev classes

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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>
This commit is contained in:
Andi Kleen 2010-01-05 12:48:02 +01:00 committed by Greg Kroah-Hartman
parent 1c205ae18d
commit 38457ab3a0
2 changed files with 10 additions and 1 deletions
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9
drivers/base/sys.c
View File

@ -145,13 +145,20 @@ int sysdev_class_register(struct sysdev_class *cls)
if (retval) if (retval)
return 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) void sysdev_class_unregister(struct sysdev_class *cls)
{ {
pr_debug("Unregistering sysdev class '%s'\n", pr_debug("Unregistering sysdev class '%s'\n",
kobject_name(&cls->kset.kobj)); kobject_name(&cls->kset.kobj));
if (cls->attrs)
sysfs_remove_files(&cls->kset.kobj,
(const struct attribute **)cls->attrs);
kset_unregister(&cls->kset); kset_unregister(&cls->kset);
} }

2
include/linux/sysdev.h
View File

@ -27,10 +27,12 @@
struct sys_device; struct sys_device;
struct sysdev_class_attribute;
struct sysdev_class { struct sysdev_class {
const char *name; const char *name;
struct list_head drivers; struct list_head drivers;
struct sysdev_class_attribute **attrs;
/* Default operations for these types of devices */ /* Default operations for these types of devices */
int (*shutdown)(struct sys_device *); int (*shutdown)(struct sys_device *);