1 // SPDX-License-Identifier: GPL-2.0
5  * Copyright (C) 2004-2007 Greg Kroah-Hartman <greg@kroah.com>
41 	ssize_t (*store)(struct foo_obj *foo, const struct foo_attribute *attr,  member
63 	if (!attribute->show)  in foo_attr_show()
64 		return -EIO;  in foo_attr_show()
66 	return attribute->show(foo, attribute, buf);  in foo_attr_show()
71  * sysfs "store" is requested (when a value is written to a file.)
83 	if (!attribute->store)  in foo_attr_store()
84 		return -EIO;  in foo_attr_store()
86 	return attribute->store(foo, attribute, buf, len);  in foo_attr_store()
92 	.store = foo_attr_store,
96  * The release function for our object.  This is REQUIRED by the kernel to
99  * NEVER try to get away with just a "blank" release function to try to be
116 	return sysfs_emit(buf, "%d\n", foo_obj->foo);  in foo_show()
124 	ret = kstrtoint(buf, 10, &foo_obj->foo);  in foo_store()
131 /* Sysfs attributes cannot be world-writable. */
144 	if (strcmp(attr->attr.name, "baz") == 0)  in b_show()
145 		var = foo_obj->baz;  in b_show()
147 		var = foo_obj->bar;  in b_show()
160 	if (strcmp(attr->attr.name, "baz") == 0)  in b_store()
161 		foo_obj->baz = var;  in b_store()
163 		foo_obj->bar = var;  in b_store()
188 	if (strcmp(kobject_name(kobj), attr->name) == 0)  in foo_default_attrs_is_visible()
190 	return attr->mode;  in foo_default_attrs_is_visible()
201  * release function, and the set of default attributes we want created
206 	.release = foo_release,
229 	foo->kobj.kset = example_kset;  in create_foo_obj()
237 	retval = kobject_init_and_add(&foo->kobj, &foo_ktype, NULL, "%s", name);  in create_foo_obj()
239 		kobject_put(&foo->kobj);  in create_foo_obj()
247 	kobject_uevent(&foo->kobj, KOBJ_ADD);  in create_foo_obj()
254 	kobject_put(&foo->kobj);  in destroy_foo_obj()
265 		return -ENOMEM;  in example_init()
290 	return -EINVAL;  in example_init()
305 MODULE_AUTHOR("Greg Kroah-Hartman <greg@kroah.com>");