driver core: Add class_attr_string for simple read-only string
Several drivers just export a static string as class attributes.
Use the new extensible attribute support to define a simple
CLASS_ATTR_STRING() macro for this.
This will allow to remove code from drivers in followon patches.
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/base/class.c b/drivers/base/class.c
index 34a2de9..2e297cc 100644
--- a/drivers/base/class.c
+++ b/drivers/base/class.c
@@ -490,6 +490,16 @@
class_put(parent);
}
+ssize_t show_class_attr_string(struct class *class, struct class_attribute *attr,
+ char *buf)
+{
+ struct class_attribute_string *cs;
+ cs = container_of(attr, struct class_attribute_string, attr);
+ return snprintf(buf, PAGE_SIZE, "%s\n", cs->str);
+}
+
+EXPORT_SYMBOL_GPL(show_class_attr_string);
+
struct class_compat {
struct kobject *kobj;
};