2005-04-17 00:20:36 +02:00
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/*
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* kobject.c - library routines for handling generic kernel objects
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*
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* Copyright (c) 2002-2003 Patrick Mochel <mochel@osdl.org>
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2007-09-27 23:48:53 +02:00
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* Copyright (c) 2006-2007 Greg Kroah-Hartman <greg@kroah.com>
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* Copyright (c) 2006-2007 Novell Inc.
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2005-04-17 00:20:36 +02:00
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*
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* This file is released under the GPLv2.
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*
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*
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* Please see the file Documentation/kobject.txt for critical information
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* about using the kobject interface.
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*/
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#include <linux/kobject.h>
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#include <linux/string.h>
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#include <linux/module.h>
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#include <linux/stat.h>
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2005-10-31 00:03:48 +01:00
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#include <linux/slab.h>
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2005-04-17 00:20:36 +02:00
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/**
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* populate_dir - populate directory with attributes.
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* @kobj: object we're working on.
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*
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* Most subsystems have a set of default attributes that
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* are associated with an object that registers with them.
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* This is a helper called during object registration that
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* loops through the default attributes of the subsystem
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* and creates attributes files for them in sysfs.
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*
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*/
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static int populate_dir(struct kobject * kobj)
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{
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struct kobj_type * t = get_ktype(kobj);
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struct attribute * attr;
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int error = 0;
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int i;
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if (t && t->default_attrs) {
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for (i = 0; (attr = t->default_attrs[i]) != NULL; i++) {
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if ((error = sysfs_create_file(kobj,attr)))
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break;
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}
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}
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return error;
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}
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2007-07-31 12:15:08 +02:00
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static int create_dir(struct kobject * kobj)
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2005-04-17 00:20:36 +02:00
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{
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int error = 0;
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if (kobject_name(kobj)) {
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2007-07-31 12:15:08 +02:00
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error = sysfs_create_dir(kobj);
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2005-04-17 00:20:36 +02:00
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if (!error) {
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if ((error = populate_dir(kobj)))
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sysfs_remove_dir(kobj);
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}
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}
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return error;
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}
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static inline struct kobject * to_kobj(struct list_head * entry)
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{
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return container_of(entry,struct kobject,entry);
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}
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static int get_kobj_path_length(struct kobject *kobj)
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{
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int length = 1;
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struct kobject * parent = kobj;
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/* walk up the ancestors until we hit the one pointing to the
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* root.
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* Add 1 to strlen for leading '/' of each level.
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*/
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do {
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2006-01-13 02:02:00 +01:00
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if (kobject_name(parent) == NULL)
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return 0;
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2005-04-17 00:20:36 +02:00
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length += strlen(kobject_name(parent)) + 1;
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parent = parent->parent;
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} while (parent);
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return length;
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}
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static void fill_kobj_path(struct kobject *kobj, char *path, int length)
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{
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struct kobject * parent;
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--length;
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for (parent = kobj; parent; parent = parent->parent) {
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int cur = strlen(kobject_name(parent));
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/* back up enough to print this name with '/' */
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length -= cur;
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strncpy (path + length, kobject_name(parent), cur);
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*(path + --length) = '/';
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}
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pr_debug("%s: path = '%s'\n",__FUNCTION__,path);
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}
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/**
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2007-02-10 10:45:59 +01:00
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* kobject_get_path - generate and return the path associated with a given kobj and kset pair.
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2005-04-17 00:20:36 +02:00
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*
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* @kobj: kobject in question, with which to build the path
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* @gfp_mask: the allocation type used to allocate the path
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2007-02-10 10:45:59 +01:00
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*
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* The result must be freed by the caller with kfree().
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2005-04-17 00:20:36 +02:00
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*/
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2005-10-21 09:18:50 +02:00
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char *kobject_get_path(struct kobject *kobj, gfp_t gfp_mask)
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2005-04-17 00:20:36 +02:00
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{
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char *path;
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int len;
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len = get_kobj_path_length(kobj);
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2006-01-13 02:02:00 +01:00
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if (len == 0)
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return NULL;
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2006-12-07 05:38:51 +01:00
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path = kzalloc(len, gfp_mask);
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2005-04-17 00:20:36 +02:00
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if (!path)
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return NULL;
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fill_kobj_path(kobj, path, len);
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return path;
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}
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2006-10-11 07:43:58 +02:00
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EXPORT_SYMBOL_GPL(kobject_get_path);
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2005-04-17 00:20:36 +02:00
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/**
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* kobject_init - initialize object.
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* @kobj: object in question.
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*/
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void kobject_init(struct kobject * kobj)
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{
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2007-01-18 21:23:51 +01:00
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if (!kobj)
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return;
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2005-04-17 00:20:36 +02:00
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kref_init(&kobj->kref);
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INIT_LIST_HEAD(&kobj->entry);
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kobj->kset = kset_get(kobj->kset);
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}
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/**
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* unlink - remove kobject from kset list.
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* @kobj: kobject.
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*
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* Remove the kobject from the kset list and decrement
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* its parent's refcount.
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* This is separated out, so we can use it in both
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* kobject_del() and kobject_add() on error.
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*/
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static void unlink(struct kobject * kobj)
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{
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if (kobj->kset) {
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spin_lock(&kobj->kset->list_lock);
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list_del_init(&kobj->entry);
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spin_unlock(&kobj->kset->list_lock);
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}
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kobject_put(kobj);
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}
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/**
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2007-07-31 12:15:08 +02:00
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* kobject_add - add an object to the hierarchy.
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2005-04-17 00:20:36 +02:00
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* @kobj: object.
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*/
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2007-07-31 12:15:08 +02:00
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int kobject_add(struct kobject * kobj)
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2005-04-17 00:20:36 +02:00
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{
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int error = 0;
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struct kobject * parent;
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if (!(kobj = kobject_get(kobj)))
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return -ENOENT;
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if (!kobj->k_name)
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2007-09-13 00:06:57 +02:00
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kobject_set_name(kobj, "NO_NAME");
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2007-02-06 01:15:23 +01:00
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if (!*kobj->k_name) {
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2006-01-20 23:08:59 +01:00
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pr_debug("kobject attempted to be registered with no name!\n");
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WARN_ON(1);
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2007-04-10 14:35:27 +02:00
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kobject_put(kobj);
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2006-01-20 23:08:59 +01:00
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return -EINVAL;
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}
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2005-04-17 00:20:36 +02:00
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parent = kobject_get(kobj->parent);
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pr_debug("kobject %s: registering. parent: %s, set: %s\n",
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kobject_name(kobj), parent ? kobject_name(parent) : "<NULL>",
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2007-09-13 00:06:57 +02:00
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kobj->kset ? kobject_name(&kobj->kset->kobj) : "<NULL>" );
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2005-04-17 00:20:36 +02:00
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if (kobj->kset) {
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spin_lock(&kobj->kset->list_lock);
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2007-09-27 23:48:53 +02:00
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if (!parent) {
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2005-04-17 00:20:36 +02:00
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parent = kobject_get(&kobj->kset->kobj);
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2007-09-27 23:48:53 +02:00
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/*
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* If the kset is our parent, get a second
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* reference, we drop both the kset and the
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* parent ref on cleanup
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*/
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kobject_get(parent);
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}
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2005-04-17 00:20:36 +02:00
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list_add_tail(&kobj->entry,&kobj->kset->list);
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spin_unlock(&kobj->kset->list_lock);
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2007-03-10 12:00:10 +01:00
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kobj->parent = parent;
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2005-04-17 00:20:36 +02:00
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}
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2007-07-31 12:15:08 +02:00
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error = create_dir(kobj);
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2005-04-17 00:20:36 +02:00
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if (error) {
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/* unlink does the kobject_put() for us */
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unlink(kobj);
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2007-01-02 13:44:44 +01:00
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kobject_put(parent);
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2006-03-20 22:17:13 +01:00
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/* be noisy on error issues */
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if (error == -EEXIST)
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2007-06-08 00:05:15 +02:00
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printk(KERN_ERR "kobject_add failed for %s with "
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"-EEXIST, don't try to register things with "
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"the same name in the same directory.\n",
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2006-03-20 22:17:13 +01:00
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kobject_name(kobj));
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else
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2007-06-08 00:05:15 +02:00
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printk(KERN_ERR "kobject_add failed for %s (%d)\n",
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2006-03-20 22:17:13 +01:00
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kobject_name(kobj), error);
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2007-06-08 00:05:15 +02:00
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dump_stack();
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2005-04-17 00:20:36 +02:00
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}
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return error;
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}
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/**
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* kobject_register - initialize and add an object.
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* @kobj: object in question.
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*/
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int kobject_register(struct kobject * kobj)
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{
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2006-03-20 22:17:13 +01:00
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int error = -EINVAL;
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2005-04-17 00:20:36 +02:00
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if (kobj) {
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kobject_init(kobj);
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error = kobject_add(kobj);
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2006-03-20 22:17:13 +01:00
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if (!error)
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2005-11-16 09:00:00 +01:00
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kobject_uevent(kobj, KOBJ_ADD);
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2006-03-20 22:17:13 +01:00
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}
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2005-04-17 00:20:36 +02:00
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return error;
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}
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2007-11-30 00:32:47 +01:00
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/**
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* kobject_set_name_vargs - Set the name of an kobject
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* @kobj: struct kobject to set the name of
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* @fmt: format string used to build the name
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* @vargs: vargs to format the string.
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*/
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static int kobject_set_name_vargs(struct kobject *kobj, const char *fmt,
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va_list vargs)
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{
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va_list aq;
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char *name;
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va_copy(aq, vargs);
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name = kvasprintf(GFP_KERNEL, fmt, vargs);
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va_end(aq);
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if (!name)
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return -ENOMEM;
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/* Free the old name, if necessary. */
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kfree(kobj->k_name);
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/* Now, set the new name */
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kobj->k_name = name;
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return 0;
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}
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2005-04-17 00:20:36 +02:00
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/**
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2007-12-04 07:45:47 +01:00
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* kobject_set_name - Set the name of a kobject
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2007-11-30 00:32:47 +01:00
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* @kobj: struct kobject to set the name of
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2007-12-04 07:45:47 +01:00
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* @fmt: format string used to build the name
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2005-04-17 00:20:36 +02:00
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*
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2007-12-04 07:45:47 +01:00
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* This sets the name of the kobject. If you have already added the
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* kobject to the system, you must call kobject_rename() in order to
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* change the name of the kobject.
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2005-04-17 00:20:36 +02:00
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*/
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2007-11-30 00:32:47 +01:00
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int kobject_set_name(struct kobject *kobj, const char *fmt, ...)
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2005-04-17 00:20:36 +02:00
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{
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va_list args;
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2007-11-30 00:32:47 +01:00
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int retval;
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2005-04-17 00:20:36 +02:00
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2007-09-13 00:06:57 +02:00
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va_start(args, fmt);
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2007-11-30 00:32:47 +01:00
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retval = kobject_set_name_vargs(kobj, fmt, args);
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2005-04-17 00:20:36 +02:00
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va_end(args);
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2007-11-30 00:32:47 +01:00
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return retval;
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2005-04-17 00:20:36 +02:00
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}
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EXPORT_SYMBOL(kobject_set_name);
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2007-12-04 06:31:08 +01:00
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/**
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* kobject_init_ng - initialize a kobject structure
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* @kobj: pointer to the kobject to initialize
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* @ktype: pointer to the ktype for this kobject.
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*
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* This function will properly initialize a kobject such that it can then
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* be passed to the kobject_add() call.
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*
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* After this function is called, the kobject MUST be cleaned up by a call
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* to kobject_put(), not by a call to kfree directly to ensure that all of
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* the memory is cleaned up properly.
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*/
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void kobject_init_ng(struct kobject *kobj, struct kobj_type *ktype)
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{
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char *err_str;
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if (!kobj) {
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err_str = "invalid kobject pointer!";
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goto error;
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}
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if (!ktype) {
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err_str = "must have a ktype to be initialized properly!\n";
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goto error;
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}
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if (atomic_read(&kobj->kref.refcount)) {
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/* do not error out as sometimes we can recover */
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printk(KERN_ERR "kobject: reference count is already set, "
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"something is seriously wrong.\n");
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dump_stack();
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}
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kref_init(&kobj->kref);
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INIT_LIST_HEAD(&kobj->entry);
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kobj->ktype = ktype;
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return;
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error:
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printk(KERN_ERR "kobject: %s\n", err_str);
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dump_stack();
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}
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EXPORT_SYMBOL(kobject_init_ng);
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2007-12-04 06:31:08 +01:00
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static int kobject_add_varg(struct kobject *kobj, struct kobject *parent,
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const char *fmt, va_list vargs)
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|
|
{
|
|
|
|
va_list aq;
|
|
|
|
int retval;
|
|
|
|
|
|
|
|
va_copy(aq, vargs);
|
|
|
|
retval = kobject_set_name_vargs(kobj, fmt, aq);
|
|
|
|
va_end(aq);
|
|
|
|
if (retval) {
|
|
|
|
printk(KERN_ERR "kobject: can not set name properly!\n");
|
|
|
|
return retval;
|
|
|
|
}
|
|
|
|
kobj->parent = parent;
|
|
|
|
return kobject_add(kobj);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* kobject_add_ng - the main kobject add function
|
|
|
|
* @kobj: the kobject to add
|
|
|
|
* @parent: pointer to the parent of the kobject.
|
|
|
|
* @fmt: format to name the kobject with.
|
|
|
|
*
|
|
|
|
* The kobject name is set and added to the kobject hierarchy in this
|
|
|
|
* function.
|
|
|
|
*
|
|
|
|
* If @parent is set, then the parent of the @kobj will be set to it.
|
|
|
|
* If @parent is NULL, then the parent of the @kobj will be set to the
|
|
|
|
* kobject associted with the kset assigned to this kobject. If no kset
|
|
|
|
* is assigned to the kobject, then the kobject will be located in the
|
|
|
|
* root of the sysfs tree.
|
|
|
|
*
|
|
|
|
* If this function returns an error, kobject_put() must be called to
|
|
|
|
* properly clean up the memory associated with the object.
|
|
|
|
*
|
|
|
|
* If the function is successful, the only way to properly clean up the
|
|
|
|
* memory is with a call to kobject_del(), in which case, a call to
|
|
|
|
* kobject_put() is not necessary (kobject_del() does the final
|
|
|
|
* kobject_put() to call the release function in the ktype's release
|
|
|
|
* pointer.)
|
|
|
|
*
|
|
|
|
* Under no instance should the kobject that is passed to this function
|
|
|
|
* be directly freed with a call to kfree(), that can leak memory.
|
|
|
|
*
|
|
|
|
* Note, no uevent will be created with this call, the caller should set
|
|
|
|
* up all of the necessary sysfs files for the object and then call
|
|
|
|
* kobject_uevent() with the UEVENT_ADD parameter to ensure that
|
|
|
|
* userspace is properly notified of this kobject's creation.
|
|
|
|
*/
|
|
|
|
int kobject_add_ng(struct kobject *kobj, struct kobject *parent,
|
|
|
|
const char *fmt, ...)
|
|
|
|
{
|
|
|
|
va_list args;
|
|
|
|
int retval;
|
|
|
|
|
|
|
|
if (!kobj)
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
va_start(args, fmt);
|
|
|
|
retval = kobject_add_varg(kobj, parent, fmt, args);
|
|
|
|
va_end(args);
|
|
|
|
|
|
|
|
return retval;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(kobject_add_ng);
|
|
|
|
|
2007-12-04 06:31:08 +01:00
|
|
|
/**
|
|
|
|
* kobject_init_and_add - initialize a kobject structure and add it to the kobject hierarchy
|
|
|
|
* @kobj: pointer to the kobject to initialize
|
|
|
|
* @ktype: pointer to the ktype for this kobject.
|
|
|
|
* @parent: pointer to the parent of this kobject.
|
|
|
|
* @fmt: the name of the kobject.
|
|
|
|
*
|
|
|
|
* This function combines the call to kobject_init_ng() and
|
|
|
|
* kobject_add_ng(). The same type of error handling after a call to
|
|
|
|
* kobject_add_ng() and kobject lifetime rules are the same here.
|
|
|
|
*/
|
|
|
|
int kobject_init_and_add(struct kobject *kobj, struct kobj_type *ktype,
|
|
|
|
struct kobject *parent, const char *fmt, ...)
|
|
|
|
{
|
|
|
|
va_list args;
|
|
|
|
int retval;
|
|
|
|
|
|
|
|
kobject_init_ng(kobj, ktype);
|
|
|
|
|
|
|
|
va_start(args, fmt);
|
|
|
|
retval = kobject_add_varg(kobj, parent, fmt, args);
|
|
|
|
va_end(args);
|
|
|
|
|
|
|
|
return retval;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(kobject_init_and_add);
|
|
|
|
|
2005-04-17 00:20:36 +02:00
|
|
|
/**
|
|
|
|
* kobject_rename - change the name of an object
|
|
|
|
* @kobj: object in question.
|
|
|
|
* @new_name: object's new name
|
|
|
|
*/
|
|
|
|
|
2005-04-26 09:32:00 +02:00
|
|
|
int kobject_rename(struct kobject * kobj, const char *new_name)
|
2005-04-17 00:20:36 +02:00
|
|
|
{
|
|
|
|
int error = 0;
|
2007-03-07 19:49:30 +01:00
|
|
|
const char *devpath = NULL;
|
|
|
|
char *devpath_string = NULL;
|
|
|
|
char *envp[2];
|
2005-04-17 00:20:36 +02:00
|
|
|
|
|
|
|
kobj = kobject_get(kobj);
|
|
|
|
if (!kobj)
|
|
|
|
return -EINVAL;
|
2007-01-24 20:35:52 +01:00
|
|
|
if (!kobj->parent)
|
|
|
|
return -EINVAL;
|
2007-03-07 19:49:30 +01:00
|
|
|
|
2007-10-25 01:52:31 +02:00
|
|
|
/* see if this name is already in use */
|
|
|
|
if (kobj->kset) {
|
|
|
|
struct kobject *temp_kobj;
|
|
|
|
temp_kobj = kset_find_obj(kobj->kset, new_name);
|
|
|
|
if (temp_kobj) {
|
2007-11-05 13:59:11 +01:00
|
|
|
printk(KERN_WARNING "kobject '%s' cannot be renamed "
|
|
|
|
"to '%s' as '%s' is already in existence.\n",
|
2007-10-25 01:52:31 +02:00
|
|
|
kobject_name(kobj), new_name, new_name);
|
|
|
|
kobject_put(temp_kobj);
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2007-03-07 19:49:30 +01:00
|
|
|
devpath = kobject_get_path(kobj, GFP_KERNEL);
|
|
|
|
if (!devpath) {
|
|
|
|
error = -ENOMEM;
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
devpath_string = kmalloc(strlen(devpath) + 15, GFP_KERNEL);
|
|
|
|
if (!devpath_string) {
|
|
|
|
error = -ENOMEM;
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
sprintf(devpath_string, "DEVPATH_OLD=%s", devpath);
|
|
|
|
envp[0] = devpath_string;
|
|
|
|
envp[1] = NULL;
|
|
|
|
|
2007-07-31 12:15:08 +02:00
|
|
|
error = sysfs_rename_dir(kobj, new_name);
|
2007-03-07 19:49:30 +01:00
|
|
|
|
|
|
|
/* This function is mostly/only used for network interface.
|
|
|
|
* Some hotplug package track interfaces by their name and
|
|
|
|
* therefore want to know when the name is changed by the user. */
|
|
|
|
if (!error)
|
|
|
|
kobject_uevent_env(kobj, KOBJ_MOVE, envp);
|
|
|
|
|
|
|
|
out:
|
|
|
|
kfree(devpath_string);
|
|
|
|
kfree(devpath);
|
2007-01-24 20:35:52 +01:00
|
|
|
kobject_put(kobj);
|
|
|
|
|
|
|
|
return error;
|
|
|
|
}
|
|
|
|
|
2006-11-20 17:07:51 +01:00
|
|
|
/**
|
|
|
|
* kobject_move - move object to another parent
|
|
|
|
* @kobj: object in question.
|
2007-01-08 20:16:44 +01:00
|
|
|
* @new_parent: object's new parent (can be NULL)
|
2006-11-20 17:07:51 +01:00
|
|
|
*/
|
|
|
|
|
|
|
|
int kobject_move(struct kobject *kobj, struct kobject *new_parent)
|
|
|
|
{
|
|
|
|
int error;
|
|
|
|
struct kobject *old_parent;
|
|
|
|
const char *devpath = NULL;
|
|
|
|
char *devpath_string = NULL;
|
|
|
|
char *envp[2];
|
|
|
|
|
|
|
|
kobj = kobject_get(kobj);
|
|
|
|
if (!kobj)
|
|
|
|
return -EINVAL;
|
|
|
|
new_parent = kobject_get(new_parent);
|
|
|
|
if (!new_parent) {
|
2007-01-08 20:16:44 +01:00
|
|
|
if (kobj->kset)
|
|
|
|
new_parent = kobject_get(&kobj->kset->kobj);
|
2006-11-20 17:07:51 +01:00
|
|
|
}
|
|
|
|
/* old object path */
|
|
|
|
devpath = kobject_get_path(kobj, GFP_KERNEL);
|
|
|
|
if (!devpath) {
|
|
|
|
error = -ENOMEM;
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
devpath_string = kmalloc(strlen(devpath) + 15, GFP_KERNEL);
|
|
|
|
if (!devpath_string) {
|
|
|
|
error = -ENOMEM;
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
sprintf(devpath_string, "DEVPATH_OLD=%s", devpath);
|
|
|
|
envp[0] = devpath_string;
|
|
|
|
envp[1] = NULL;
|
|
|
|
error = sysfs_move_dir(kobj, new_parent);
|
|
|
|
if (error)
|
|
|
|
goto out;
|
|
|
|
old_parent = kobj->parent;
|
|
|
|
kobj->parent = new_parent;
|
2007-03-03 14:11:21 +01:00
|
|
|
new_parent = NULL;
|
2006-11-20 17:07:51 +01:00
|
|
|
kobject_put(old_parent);
|
|
|
|
kobject_uevent_env(kobj, KOBJ_MOVE, envp);
|
|
|
|
out:
|
2007-03-03 14:11:21 +01:00
|
|
|
kobject_put(new_parent);
|
2006-11-20 17:07:51 +01:00
|
|
|
kobject_put(kobj);
|
|
|
|
kfree(devpath_string);
|
|
|
|
kfree(devpath);
|
|
|
|
return error;
|
|
|
|
}
|
|
|
|
|
2005-04-17 00:20:36 +02:00
|
|
|
/**
|
|
|
|
* kobject_del - unlink kobject from hierarchy.
|
|
|
|
* @kobj: object.
|
|
|
|
*/
|
|
|
|
|
|
|
|
void kobject_del(struct kobject * kobj)
|
|
|
|
{
|
2007-01-18 21:23:51 +01:00
|
|
|
if (!kobj)
|
|
|
|
return;
|
2005-04-17 00:20:36 +02:00
|
|
|
sysfs_remove_dir(kobj);
|
|
|
|
unlink(kobj);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* kobject_unregister - remove object from hierarchy and decrement refcount.
|
|
|
|
* @kobj: object going away.
|
|
|
|
*/
|
|
|
|
|
|
|
|
void kobject_unregister(struct kobject * kobj)
|
|
|
|
{
|
2007-01-18 21:23:51 +01:00
|
|
|
if (!kobj)
|
|
|
|
return;
|
2005-04-17 00:20:36 +02:00
|
|
|
pr_debug("kobject %s: unregistering\n",kobject_name(kobj));
|
2005-11-16 09:00:00 +01:00
|
|
|
kobject_uevent(kobj, KOBJ_REMOVE);
|
2005-04-17 00:20:36 +02:00
|
|
|
kobject_del(kobj);
|
|
|
|
kobject_put(kobj);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* kobject_get - increment refcount for object.
|
|
|
|
* @kobj: object.
|
|
|
|
*/
|
|
|
|
|
|
|
|
struct kobject * kobject_get(struct kobject * kobj)
|
|
|
|
{
|
|
|
|
if (kobj)
|
|
|
|
kref_get(&kobj->kref);
|
|
|
|
return kobj;
|
|
|
|
}
|
|
|
|
|
2007-12-04 06:31:08 +01:00
|
|
|
/*
|
|
|
|
* kobject_cleanup - free kobject resources.
|
|
|
|
* @kobj: object to cleanup
|
2005-04-17 00:20:36 +02:00
|
|
|
*/
|
2007-12-04 06:31:08 +01:00
|
|
|
static void kobject_cleanup(struct kobject *kobj)
|
2005-04-17 00:20:36 +02:00
|
|
|
{
|
|
|
|
struct kobj_type * t = get_ktype(kobj);
|
|
|
|
struct kset * s = kobj->kset;
|
|
|
|
struct kobject * parent = kobj->parent;
|
2007-09-13 00:06:57 +02:00
|
|
|
const char *name = kobj->k_name;
|
2005-04-17 00:20:36 +02:00
|
|
|
|
|
|
|
pr_debug("kobject %s: cleaning up\n",kobject_name(kobj));
|
2007-09-13 00:06:57 +02:00
|
|
|
if (t && t->release) {
|
2005-04-17 00:20:36 +02:00
|
|
|
t->release(kobj);
|
2007-09-13 00:06:57 +02:00
|
|
|
/* If we have a release function, we can guess that this was
|
|
|
|
* not a statically allocated kobject, so we should be safe to
|
|
|
|
* free the name */
|
|
|
|
kfree(name);
|
|
|
|
}
|
2005-04-17 00:20:36 +02:00
|
|
|
if (s)
|
|
|
|
kset_put(s);
|
2007-01-02 13:44:44 +01:00
|
|
|
kobject_put(parent);
|
2005-04-17 00:20:36 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
static void kobject_release(struct kref *kref)
|
|
|
|
{
|
|
|
|
kobject_cleanup(container_of(kref, struct kobject, kref));
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* kobject_put - decrement refcount for object.
|
|
|
|
* @kobj: object.
|
|
|
|
*
|
|
|
|
* Decrement the refcount, and if 0, call kobject_cleanup().
|
|
|
|
*/
|
|
|
|
void kobject_put(struct kobject * kobj)
|
|
|
|
{
|
|
|
|
if (kobj)
|
|
|
|
kref_put(&kobj->kref, kobject_release);
|
|
|
|
}
|
|
|
|
|
2007-11-05 22:16:15 +01:00
|
|
|
static void dynamic_kobj_release(struct kobject *kobj)
|
2006-03-13 23:14:25 +01:00
|
|
|
{
|
2007-11-05 22:16:15 +01:00
|
|
|
pr_debug("%s: freeing %s\n", __FUNCTION__, kobject_name(kobj));
|
2006-03-13 23:14:25 +01:00
|
|
|
kfree(kobj);
|
|
|
|
}
|
|
|
|
|
2007-11-05 22:16:15 +01:00
|
|
|
static struct kobj_type dynamic_kobj_ktype = {
|
2007-11-02 13:47:53 +01:00
|
|
|
.release = dynamic_kobj_release,
|
|
|
|
.sysfs_ops = &kobj_sysfs_ops,
|
2006-03-13 23:14:25 +01:00
|
|
|
};
|
|
|
|
|
2007-11-06 07:24:43 +01:00
|
|
|
/**
|
2007-11-05 22:16:15 +01:00
|
|
|
* kobject_create - create a struct kobject dynamically
|
|
|
|
*
|
|
|
|
* This function creates a kobject structure dynamically and sets it up
|
|
|
|
* to be a "dynamic" kobject with a default release function set up.
|
|
|
|
*
|
|
|
|
* If the kobject was not able to be created, NULL will be returned.
|
2007-11-06 07:24:43 +01:00
|
|
|
* The kobject structure returned from here must be cleaned up with a
|
|
|
|
* call to kobject_put() and not kfree(), as kobject_init_ng() has
|
|
|
|
* already been called on this structure.
|
2007-11-05 22:16:15 +01:00
|
|
|
*/
|
2007-11-06 07:24:43 +01:00
|
|
|
struct kobject *kobject_create(void)
|
2007-11-05 22:16:15 +01:00
|
|
|
{
|
|
|
|
struct kobject *kobj;
|
|
|
|
|
|
|
|
kobj = kzalloc(sizeof(*kobj), GFP_KERNEL);
|
|
|
|
if (!kobj)
|
|
|
|
return NULL;
|
|
|
|
|
|
|
|
kobject_init_ng(kobj, &dynamic_kobj_ktype);
|
|
|
|
return kobj;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* kobject_create_and_add - create a struct kobject dynamically and register it with sysfs
|
|
|
|
*
|
|
|
|
* @name: the name for the kset
|
|
|
|
* @parent: the parent kobject of this kobject, if any.
|
|
|
|
*
|
|
|
|
* This function creates a kset structure dynamically and registers it
|
|
|
|
* with sysfs. When you are finished with this structure, call
|
|
|
|
* kobject_unregister() and the structure will be dynamically freed when
|
|
|
|
* it is no longer being used.
|
|
|
|
*
|
|
|
|
* If the kobject was not able to be created, NULL will be returned.
|
|
|
|
*/
|
|
|
|
struct kobject *kobject_create_and_add(const char *name, struct kobject *parent)
|
|
|
|
{
|
|
|
|
struct kobject *kobj;
|
|
|
|
int retval;
|
|
|
|
|
|
|
|
kobj = kobject_create();
|
|
|
|
if (!kobj)
|
|
|
|
return NULL;
|
|
|
|
|
|
|
|
retval = kobject_add_ng(kobj, parent, "%s", name);
|
|
|
|
if (retval) {
|
|
|
|
printk(KERN_WARNING "%s: kobject_add error: %d\n",
|
|
|
|
__FUNCTION__, retval);
|
|
|
|
kobject_put(kobj);
|
|
|
|
kobj = NULL;
|
|
|
|
}
|
|
|
|
return kobj;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(kobject_create_and_add);
|
|
|
|
|
2005-04-17 00:20:36 +02:00
|
|
|
/**
|
|
|
|
* kset_init - initialize a kset for use
|
|
|
|
* @k: kset
|
|
|
|
*/
|
|
|
|
|
|
|
|
void kset_init(struct kset * k)
|
|
|
|
{
|
|
|
|
kobject_init(&k->kobj);
|
|
|
|
INIT_LIST_HEAD(&k->list);
|
|
|
|
spin_lock_init(&k->list_lock);
|
|
|
|
}
|
|
|
|
|
2007-11-02 13:47:53 +01:00
|
|
|
/* default kobject attribute operations */
|
|
|
|
static ssize_t kobj_attr_show(struct kobject *kobj, struct attribute *attr,
|
|
|
|
char *buf)
|
|
|
|
{
|
|
|
|
struct kobj_attribute *kattr;
|
|
|
|
ssize_t ret = -EIO;
|
|
|
|
|
|
|
|
kattr = container_of(attr, struct kobj_attribute, attr);
|
|
|
|
if (kattr->show)
|
|
|
|
ret = kattr->show(kobj, kattr, buf);
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
static ssize_t kobj_attr_store(struct kobject *kobj, struct attribute *attr,
|
|
|
|
const char *buf, size_t count)
|
|
|
|
{
|
|
|
|
struct kobj_attribute *kattr;
|
|
|
|
ssize_t ret = -EIO;
|
|
|
|
|
|
|
|
kattr = container_of(attr, struct kobj_attribute, attr);
|
|
|
|
if (kattr->store)
|
|
|
|
ret = kattr->store(kobj, kattr, buf, count);
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
struct sysfs_ops kobj_sysfs_ops = {
|
|
|
|
.show = kobj_attr_show,
|
|
|
|
.store = kobj_attr_store,
|
|
|
|
};
|
2005-04-17 00:20:36 +02:00
|
|
|
|
|
|
|
/**
|
|
|
|
* kset_add - add a kset object to the hierarchy.
|
|
|
|
* @k: kset.
|
|
|
|
*/
|
|
|
|
|
|
|
|
int kset_add(struct kset * k)
|
|
|
|
{
|
|
|
|
return kobject_add(&k->kobj);
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
* kset_register - initialize and add a kset.
|
|
|
|
* @k: kset.
|
|
|
|
*/
|
|
|
|
|
|
|
|
int kset_register(struct kset * k)
|
|
|
|
{
|
2007-05-26 11:21:36 +02:00
|
|
|
int err;
|
|
|
|
|
2007-01-18 21:23:51 +01:00
|
|
|
if (!k)
|
|
|
|
return -EINVAL;
|
2007-05-26 11:21:36 +02:00
|
|
|
|
2005-04-17 00:20:36 +02:00
|
|
|
kset_init(k);
|
2007-05-26 11:21:36 +02:00
|
|
|
err = kset_add(k);
|
|
|
|
if (err)
|
|
|
|
return err;
|
|
|
|
kobject_uevent(&k->kobj, KOBJ_ADD);
|
|
|
|
return 0;
|
2005-04-17 00:20:36 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
* kset_unregister - remove a kset.
|
|
|
|
* @k: kset.
|
|
|
|
*/
|
|
|
|
|
|
|
|
void kset_unregister(struct kset * k)
|
|
|
|
{
|
2007-01-18 21:23:51 +01:00
|
|
|
if (!k)
|
|
|
|
return;
|
2005-04-17 00:20:36 +02:00
|
|
|
kobject_unregister(&k->kobj);
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
* kset_find_obj - search for object in kset.
|
|
|
|
* @kset: kset we're looking in.
|
|
|
|
* @name: object's name.
|
|
|
|
*
|
|
|
|
* Lock kset via @kset->subsys, and iterate over @kset->list,
|
|
|
|
* looking for a matching kobject. If matching object is found
|
|
|
|
* take a reference and return the object.
|
|
|
|
*/
|
|
|
|
|
|
|
|
struct kobject * kset_find_obj(struct kset * kset, const char * name)
|
|
|
|
{
|
|
|
|
struct list_head * entry;
|
|
|
|
struct kobject * ret = NULL;
|
|
|
|
|
|
|
|
spin_lock(&kset->list_lock);
|
|
|
|
list_for_each(entry,&kset->list) {
|
|
|
|
struct kobject * k = to_kobj(entry);
|
|
|
|
if (kobject_name(k) && !strcmp(kobject_name(k),name)) {
|
|
|
|
ret = kobject_get(k);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
spin_unlock(&kset->list_lock);
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2007-09-27 23:48:53 +02:00
|
|
|
static void kset_release(struct kobject *kobj)
|
|
|
|
{
|
|
|
|
struct kset *kset = container_of(kobj, struct kset, kobj);
|
|
|
|
pr_debug("kset %s: now freed\n", kobject_name(kobj));
|
|
|
|
kfree(kset);
|
|
|
|
}
|
|
|
|
|
2007-11-02 13:47:53 +01:00
|
|
|
static struct kobj_type kset_ktype = {
|
|
|
|
.sysfs_ops = &kobj_sysfs_ops,
|
2007-09-27 23:48:53 +02:00
|
|
|
.release = kset_release,
|
|
|
|
};
|
|
|
|
|
|
|
|
/**
|
|
|
|
* kset_create - create a struct kset dynamically
|
|
|
|
*
|
|
|
|
* @name: the name for the kset
|
|
|
|
* @uevent_ops: a struct kset_uevent_ops for the kset
|
|
|
|
* @parent_kobj: the parent kobject of this kset, if any.
|
|
|
|
*
|
|
|
|
* This function creates a kset structure dynamically. This structure can
|
|
|
|
* then be registered with the system and show up in sysfs with a call to
|
|
|
|
* kset_register(). When you are finished with this structure, if
|
|
|
|
* kset_register() has been called, call kset_unregister() and the
|
|
|
|
* structure will be dynamically freed when it is no longer being used.
|
|
|
|
*
|
|
|
|
* If the kset was not able to be created, NULL will be returned.
|
|
|
|
*/
|
|
|
|
static struct kset *kset_create(const char *name,
|
|
|
|
struct kset_uevent_ops *uevent_ops,
|
|
|
|
struct kobject *parent_kobj)
|
|
|
|
{
|
|
|
|
struct kset *kset;
|
|
|
|
|
|
|
|
kset = kzalloc(sizeof(*kset), GFP_KERNEL);
|
|
|
|
if (!kset)
|
|
|
|
return NULL;
|
|
|
|
kobject_set_name(&kset->kobj, name);
|
|
|
|
kset->uevent_ops = uevent_ops;
|
|
|
|
kset->kobj.parent = parent_kobj;
|
|
|
|
|
|
|
|
/*
|
2007-11-02 13:47:53 +01:00
|
|
|
* The kobject of this kset will have a type of kset_ktype and belong to
|
2007-09-27 23:48:53 +02:00
|
|
|
* no kset itself. That way we can properly free it when it is
|
|
|
|
* finished being used.
|
|
|
|
*/
|
2007-11-02 13:47:53 +01:00
|
|
|
kset->kobj.ktype = &kset_ktype;
|
2007-09-27 23:48:53 +02:00
|
|
|
kset->kobj.kset = NULL;
|
|
|
|
|
|
|
|
return kset;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* kset_create_and_add - create a struct kset dynamically and add it to sysfs
|
|
|
|
*
|
|
|
|
* @name: the name for the kset
|
|
|
|
* @uevent_ops: a struct kset_uevent_ops for the kset
|
|
|
|
* @parent_kobj: the parent kobject of this kset, if any.
|
|
|
|
*
|
|
|
|
* This function creates a kset structure dynamically and registers it
|
|
|
|
* with sysfs. When you are finished with this structure, call
|
|
|
|
* kset_unregister() and the structure will be dynamically freed when it
|
|
|
|
* is no longer being used.
|
|
|
|
*
|
|
|
|
* If the kset was not able to be created, NULL will be returned.
|
|
|
|
*/
|
|
|
|
struct kset *kset_create_and_add(const char *name,
|
|
|
|
struct kset_uevent_ops *uevent_ops,
|
|
|
|
struct kobject *parent_kobj)
|
|
|
|
{
|
|
|
|
struct kset *kset;
|
|
|
|
int error;
|
|
|
|
|
|
|
|
kset = kset_create(name, uevent_ops, parent_kobj);
|
|
|
|
if (!kset)
|
|
|
|
return NULL;
|
|
|
|
error = kset_register(kset);
|
|
|
|
if (error) {
|
|
|
|
kfree(kset);
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
return kset;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(kset_create_and_add);
|
|
|
|
|
2005-04-17 00:20:36 +02:00
|
|
|
EXPORT_SYMBOL(kobject_init);
|
|
|
|
EXPORT_SYMBOL(kobject_register);
|
|
|
|
EXPORT_SYMBOL(kobject_unregister);
|
|
|
|
EXPORT_SYMBOL(kobject_get);
|
|
|
|
EXPORT_SYMBOL(kobject_put);
|
|
|
|
EXPORT_SYMBOL(kobject_add);
|
|
|
|
EXPORT_SYMBOL(kobject_del);
|
|
|
|
|
|
|
|
EXPORT_SYMBOL(kset_register);
|
|
|
|
EXPORT_SYMBOL(kset_unregister);
|