sysfs.h: add ATTRIBUTE_GROUPS() macro

commit f2f37f58b1b933b06d6d84e80a31a1b500fb0db2 upstream.

To make it easier for driver subsystems to work with attribute groups,
create the ATTRIBUTE_GROUPS macro to remove some of the repetitive
typing for the most common use for attribute groups.

Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Tested-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/include/linux/sysfs.h b/include/linux/sysfs.h
index dac0859..2b9cd8d 100644 (file)
--- a/include/linux/sysfs.h
+++ b/include/linux/sysfs.h
@@ -80,6 +80,15 @@ struct attribute_group {
 
 #define __ATTR_NULL { .attr = { .name = NULL } }
 
+#define ATTRIBUTE_GROUPS(name)                                 \
+static const struct attribute_group name##_group = {           \
+       .attrs = name##_attrs,                                  \
+};                                                             \
+static const struct attribute_group *name##_groups[] = {       \
+       &name##_group,                                          \
+       NULL,                                                   \
+}
+
 #define attr_name(_attr) (_attr).attr.name
 
 struct file;