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Commit 869dfc87 authored by Andi Kleen's avatar Andi Kleen Committed by Greg Kroah-Hartman
Browse files

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: default avatarAndi Kleen <ak@linux.intel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 28812fe1

drivers/base/class.c

+10 −0
Original line number Diff line number Diff line
@@ -490,6 +490,16 @@ void class_interface_unregister(struct class_interface *class_intf) 
	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;

};

include/linux/device.h

+17 −0
Original line number Diff line number Diff line
@@ -265,6 +265,23 @@ extern int __must_check class_create_file(struct class *class, 
extern void class_remove_file(struct class *class,

			      const struct class_attribute *attr);



/* Simple class attribute that is just a static string */



struct class_attribute_string {

	struct class_attribute attr;

	char *str;

};



/* Currently read-only only */

#define _CLASS_ATTR_STRING(_name, _mode, _str) \

	{ __ATTR(_name, _mode, show_class_attr_string, NULL), _str }

#define CLASS_ATTR_STRING(_name, _mode, _str) \

	struct class_attribute_string class_attr_##_name = \

		_CLASS_ATTR_STRING(_name, _mode, _str)



extern ssize_t show_class_attr_string(struct class *class, struct class_attribute *attr,

                        char *buf);



struct class_interface {

	struct list_head	node;

	struct class		*class;