1 // SPDX-License-Identifier: GPL-2.0
5  * Copyright (C) 2004-2007 Greg Kroah-Hartman <greg@kroah.com>
37 /* a custom attribute that works just for a struct foo_obj. */
39 	struct attribute attr;
53 			     struct attribute *attr,  in foo_attr_show()
56 	struct foo_attribute *attribute;  in foo_attr_show()  local
59 	attribute = to_foo_attr(attr);  in foo_attr_show()
62 	if (!attribute->show)  in foo_attr_show()
63 		return -EIO;  in foo_attr_show()
65 	return attribute->show(foo, attribute, buf);  in foo_attr_show()
73 			      struct attribute *attr,  in foo_attr_store()
76 	struct foo_attribute *attribute;  in foo_attr_store()  local
79 	attribute = to_foo_attr(attr);  in foo_attr_store()
82 	if (!attribute->store)  in foo_attr_store()
83 		return -EIO;  in foo_attr_store()
85 	return attribute->store(foo, attribute, buf, len);  in foo_attr_store()
115 	return sysfs_emit(buf, "%d\n", foo_obj->foo);  in foo_show()
123 	ret = kstrtoint(buf, 10, &foo_obj->foo);  in foo_store()
130 /* Sysfs attributes cannot be world-writable. */
136  * looking at the attribute for the "baz" and "bar" files.
143 	if (strcmp(attr->attr.name, "baz") == 0)  in b_show()
144 		var = foo_obj->baz;  in b_show()
146 		var = foo_obj->bar;  in b_show()
159 	if (strcmp(attr->attr.name, "baz") == 0)  in b_store()
160 		foo_obj->baz = var;  in b_store()
162 		foo_obj->bar = var;  in b_store()
175 static struct attribute *foo_default_attrs[] = {
185  * release function, and the set of default attributes we want created
210 	 * As we have a kset for this kobject, we need to set it before calling  in create_foo_obj()
213 	foo->kobj.kset = example_kset;  in create_foo_obj()
218 	 * kobject, we don't have to set a parent for the kobject, the kobject  in create_foo_obj()
221 	retval = kobject_init_and_add(&foo->kobj, &foo_ktype, NULL, "%s", name);  in create_foo_obj()
223 		kobject_put(&foo->kobj);  in create_foo_obj()
231 	kobject_uevent(&foo->kobj, KOBJ_ADD);  in create_foo_obj()
238 	kobject_put(&foo->kobj);  in destroy_foo_obj()
249 		return -ENOMEM;  in example_init()
274 	return -EINVAL;  in example_init()
289 MODULE_AUTHOR("Greg Kroah-Hartman <greg@kroah.com>");