diff options
Diffstat (limited to 'libdde_linux26/contrib/lib/kobject.c')
| -rw-r--r-- | libdde_linux26/contrib/lib/kobject.c | 850 |
1 files changed, 0 insertions, 850 deletions
diff --git a/libdde_linux26/contrib/lib/kobject.c b/libdde_linux26/contrib/lib/kobject.c deleted file mode 100644 index 0487d1f6..00000000 --- a/libdde_linux26/contrib/lib/kobject.c +++ /dev/null @@ -1,850 +0,0 @@ -/* - * kobject.c - library routines for handling generic kernel objects - * - * Copyright (c) 2002-2003 Patrick Mochel <mochel@osdl.org> - * Copyright (c) 2006-2007 Greg Kroah-Hartman <greg@kroah.com> - * Copyright (c) 2006-2007 Novell Inc. - * - * This file is released under the GPLv2. - * - * - * Please see the file Documentation/kobject.txt for critical information - * about using the kobject interface. - */ - -#include <linux/kobject.h> -#include <linux/string.h> -#include <linux/module.h> -#include <linux/stat.h> -#include <linux/slab.h> - -/* - * populate_dir - populate directory with attributes. - * @kobj: object we're working on. - * - * Most subsystems have a set of default attributes that are associated - * with an object that registers with them. This is a helper called during - * object registration that loops through the default attributes of the - * subsystem and creates attributes files for them in sysfs. - */ -static int populate_dir(struct kobject *kobj) -{ - struct kobj_type *t = get_ktype(kobj); - struct attribute *attr; - int error = 0; - int i; - - if (t && t->default_attrs) { - for (i = 0; (attr = t->default_attrs[i]) != NULL; i++) { - error = sysfs_create_file(kobj, attr); - if (error) - break; - } - } - return error; -} - -static int create_dir(struct kobject *kobj) -{ - int error = 0; - if (kobject_name(kobj)) { - error = sysfs_create_dir(kobj); - if (!error) { - error = populate_dir(kobj); - if (error) - sysfs_remove_dir(kobj); - } - } - return error; -} - -static int get_kobj_path_length(struct kobject *kobj) -{ - int length = 1; - struct kobject *parent = kobj; - - /* walk up the ancestors until we hit the one pointing to the - * root. - * Add 1 to strlen for leading '/' of each level. - */ - do { - if (kobject_name(parent) == NULL) - return 0; - length += strlen(kobject_name(parent)) + 1; - parent = parent->parent; - } while (parent); - return length; -} - -static void fill_kobj_path(struct kobject *kobj, char *path, int length) -{ - struct kobject *parent; - - --length; - for (parent = kobj; parent; parent = parent->parent) { - int cur = strlen(kobject_name(parent)); - /* back up enough to print this name with '/' */ - length -= cur; - strncpy(path + length, kobject_name(parent), cur); - *(path + --length) = '/'; - } - - pr_debug("kobject: '%s' (%p): %s: path = '%s'\n", kobject_name(kobj), - kobj, __func__, path); -} - -/** - * kobject_get_path - generate and return the path associated with a given kobj and kset pair. - * - * @kobj: kobject in question, with which to build the path - * @gfp_mask: the allocation type used to allocate the path - * - * The result must be freed by the caller with kfree(). - */ -char *kobject_get_path(struct kobject *kobj, gfp_t gfp_mask) -{ - char *path; - int len; - - len = get_kobj_path_length(kobj); - if (len == 0) - return NULL; - path = kzalloc(len, gfp_mask); - if (!path) - return NULL; - fill_kobj_path(kobj, path, len); - - return path; -} -EXPORT_SYMBOL_GPL(kobject_get_path); - -/* add the kobject to its kset's list */ -static void kobj_kset_join(struct kobject *kobj) -{ - if (!kobj->kset) - return; - - kset_get(kobj->kset); - spin_lock(&kobj->kset->list_lock); - list_add_tail(&kobj->entry, &kobj->kset->list); - spin_unlock(&kobj->kset->list_lock); -} - -/* remove the kobject from its kset's list */ -static void kobj_kset_leave(struct kobject *kobj) -{ - if (!kobj->kset) - return; - - spin_lock(&kobj->kset->list_lock); - list_del_init(&kobj->entry); - spin_unlock(&kobj->kset->list_lock); - kset_put(kobj->kset); -} - -static void kobject_init_internal(struct kobject *kobj) -{ - if (!kobj) - return; - kref_init(&kobj->kref); - INIT_LIST_HEAD(&kobj->entry); - kobj->state_in_sysfs = 0; - kobj->state_add_uevent_sent = 0; - kobj->state_remove_uevent_sent = 0; - kobj->state_initialized = 1; -} - - -static int kobject_add_internal(struct kobject *kobj) -{ - int error = 0; - struct kobject *parent; - - if (!kobj) - return -ENOENT; - - if (!kobj->name || !kobj->name[0]) { - WARN(1, "kobject: (%p): attempted to be registered with empty " - "name!\n", kobj); - return -EINVAL; - } - - parent = kobject_get(kobj->parent); - - /* join kset if set, use it as parent if we do not already have one */ - if (kobj->kset) { - if (!parent) - parent = kobject_get(&kobj->kset->kobj); - kobj_kset_join(kobj); - kobj->parent = parent; - } - - pr_debug("kobject: '%s' (%p): %s: parent: '%s', set: '%s'\n", - kobject_name(kobj), kobj, __func__, - parent ? kobject_name(parent) : "<NULL>", - kobj->kset ? kobject_name(&kobj->kset->kobj) : "<NULL>"); - - error = create_dir(kobj); - if (error) { - kobj_kset_leave(kobj); - kobject_put(parent); - kobj->parent = NULL; - - /* be noisy on error issues */ - if (error == -EEXIST) - printk(KERN_ERR "%s failed for %s with " - "-EEXIST, don't try to register things with " - "the same name in the same directory.\n", - __func__, kobject_name(kobj)); - else - printk(KERN_ERR "%s failed for %s (%d)\n", - __func__, kobject_name(kobj), error); - dump_stack(); - } else - kobj->state_in_sysfs = 1; - - return error; -} - -/** - * kobject_set_name_vargs - Set the name of an kobject - * @kobj: struct kobject to set the name of - * @fmt: format string used to build the name - * @vargs: vargs to format the string. - */ -static int kobject_set_name_vargs(struct kobject *kobj, const char *fmt, - va_list vargs) -{ - const char *old_name = kobj->name; - char *s; - - kobj->name = kvasprintf(GFP_KERNEL, fmt, vargs); - if (!kobj->name) - return -ENOMEM; - - /* ewww... some of these buggers have '/' in the name ... */ - while ((s = strchr(kobj->name, '/'))) - s[0] = '!'; - - kfree(old_name); - return 0; -} - -/** - * kobject_set_name - Set the name of a kobject - * @kobj: struct kobject to set the name of - * @fmt: format string used to build the name - * - * This sets the name of the kobject. If you have already added the - * kobject to the system, you must call kobject_rename() in order to - * change the name of the kobject. - */ -int kobject_set_name(struct kobject *kobj, const char *fmt, ...) -{ - va_list vargs; - int retval; - - va_start(vargs, fmt); - retval = kobject_set_name_vargs(kobj, fmt, vargs); - va_end(vargs); - - return retval; -} -EXPORT_SYMBOL(kobject_set_name); - -/** - * kobject_init - initialize a kobject structure - * @kobj: pointer to the kobject to initialize - * @ktype: pointer to the ktype for this kobject. - * - * This function will properly initialize a kobject such that it can then - * be passed to the kobject_add() call. - * - * After this function is called, the kobject MUST be cleaned up by a call - * to kobject_put(), not by a call to kfree directly to ensure that all of - * the memory is cleaned up properly. - */ -void kobject_init(struct kobject *kobj, struct kobj_type *ktype) -{ - char *err_str; - - if (!kobj) { - err_str = "invalid kobject pointer!"; - goto error; - } - if (!ktype) { - err_str = "must have a ktype to be initialized properly!\n"; - goto error; - } - if (kobj->state_initialized) { - /* do not error out as sometimes we can recover */ - printk(KERN_ERR "kobject (%p): tried to init an initialized " - "object, something is seriously wrong.\n", kobj); - dump_stack(); - } - - kobject_init_internal(kobj); - kobj->ktype = ktype; - return; - -error: - printk(KERN_ERR "kobject (%p): %s\n", kobj, err_str); - dump_stack(); -} -EXPORT_SYMBOL(kobject_init); - -static int kobject_add_varg(struct kobject *kobj, struct kobject *parent, - const char *fmt, va_list vargs) -{ - int retval; - - retval = kobject_set_name_vargs(kobj, fmt, vargs); - if (retval) { - printk(KERN_ERR "kobject: can not set name properly!\n"); - return retval; - } - kobj->parent = parent; - return kobject_add_internal(kobj); -} - -/** - * kobject_add - 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. - * 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 "add" 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(struct kobject *kobj, struct kobject *parent, - const char *fmt, ...) -{ - va_list args; - int retval; - - if (!kobj) - return -EINVAL; - - if (!kobj->state_initialized) { - printk(KERN_ERR "kobject '%s' (%p): tried to add an " - "uninitialized object, something is seriously wrong.\n", - kobject_name(kobj), kobj); - dump_stack(); - return -EINVAL; - } - va_start(args, fmt); - retval = kobject_add_varg(kobj, parent, fmt, args); - va_end(args); - - return retval; -} -EXPORT_SYMBOL(kobject_add); - -/** - * 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() and - * kobject_add(). The same type of error handling after a call to - * kobject_add() 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(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); - -/** - * kobject_rename - change the name of an object - * @kobj: object in question. - * @new_name: object's new name - * - * It is the responsibility of the caller to provide mutual - * exclusion between two different calls of kobject_rename - * on the same kobject and to ensure that new_name is valid and - * won't conflict with other kobjects. - */ -int kobject_rename(struct kobject *kobj, const char *new_name) -{ - int error = 0; - const char *devpath = NULL; - const char *dup_name = NULL, *name; - char *devpath_string = NULL; - char *envp[2]; - - kobj = kobject_get(kobj); - if (!kobj) - return -EINVAL; - if (!kobj->parent) - return -EINVAL; - - 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; - - name = dup_name = kstrdup(new_name, GFP_KERNEL); - if (!name) { - error = -ENOMEM; - goto out; - } - - error = sysfs_rename_dir(kobj, new_name); - if (error) - goto out; - - /* Install the new kobject name */ - dup_name = kobj->name; - kobj->name = name; - - /* 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. */ - kobject_uevent_env(kobj, KOBJ_MOVE, envp); - -out: - kfree(dup_name); - kfree(devpath_string); - kfree(devpath); - kobject_put(kobj); - - return error; -} -EXPORT_SYMBOL_GPL(kobject_rename); - -/** - * kobject_move - move object to another parent - * @kobj: object in question. - * @new_parent: object's new parent (can be NULL) - */ -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) { - if (kobj->kset) - new_parent = kobject_get(&kobj->kset->kobj); - } - /* 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; - new_parent = NULL; - kobject_put(old_parent); - kobject_uevent_env(kobj, KOBJ_MOVE, envp); -out: - kobject_put(new_parent); - kobject_put(kobj); - kfree(devpath_string); - kfree(devpath); - return error; -} - -/** - * kobject_del - unlink kobject from hierarchy. - * @kobj: object. - */ -void kobject_del(struct kobject *kobj) -{ - if (!kobj) - return; - - sysfs_remove_dir(kobj); - kobj->state_in_sysfs = 0; - kobj_kset_leave(kobj); - kobject_put(kobj->parent); - kobj->parent = NULL; -} - -/** - * kobject_get - increment refcount for object. - * @kobj: object. - */ -struct kobject *kobject_get(struct kobject *kobj) -{ - if (kobj) - kref_get(&kobj->kref); - return kobj; -} - -/* - * kobject_cleanup - free kobject resources. - * @kobj: object to cleanup - */ -static void kobject_cleanup(struct kobject *kobj) -{ - struct kobj_type *t = get_ktype(kobj); - const char *name = kobj->name; - - pr_debug("kobject: '%s' (%p): %s\n", - kobject_name(kobj), kobj, __func__); - - if (t && !t->release) - pr_debug("kobject: '%s' (%p): does not have a release() " - "function, it is broken and must be fixed.\n", - kobject_name(kobj), kobj); - - /* send "remove" if the caller did not do it but sent "add" */ - if (kobj->state_add_uevent_sent && !kobj->state_remove_uevent_sent) { - pr_debug("kobject: '%s' (%p): auto cleanup 'remove' event\n", - kobject_name(kobj), kobj); - kobject_uevent(kobj, KOBJ_REMOVE); - } - - /* remove from sysfs if the caller did not do it */ - if (kobj->state_in_sysfs) { - pr_debug("kobject: '%s' (%p): auto cleanup kobject_del\n", - kobject_name(kobj), kobj); - kobject_del(kobj); - } - - if (t && t->release) { - pr_debug("kobject: '%s' (%p): calling ktype release\n", - kobject_name(kobj), kobj); - t->release(kobj); - } - - /* free name if we allocated it */ - if (name) { - pr_debug("kobject: '%s': free name\n", name); - kfree(name); - } -} - -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) { - if (!kobj->state_initialized) - WARN(1, KERN_WARNING "kobject: '%s' (%p): is not " - "initialized, yet kobject_put() is being " - "called.\n", kobject_name(kobj), kobj); - kref_put(&kobj->kref, kobject_release); - } -} - -static void dynamic_kobj_release(struct kobject *kobj) -{ - pr_debug("kobject: (%p): %s\n", kobj, __func__); - kfree(kobj); -} - -static struct kobj_type dynamic_kobj_ktype = { - .release = dynamic_kobj_release, - .sysfs_ops = &kobj_sysfs_ops, -}; - -/** - * 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. - * The kobject structure returned from here must be cleaned up with a - * call to kobject_put() and not kfree(), as kobject_init() has - * already been called on this structure. - */ -struct kobject *kobject_create(void) -{ - struct kobject *kobj; - - kobj = kzalloc(sizeof(*kobj), GFP_KERNEL); - if (!kobj) - return NULL; - - kobject_init(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 kobject structure dynamically and registers it - * with sysfs. When you are finished with this structure, call - * kobject_put() 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(kobj, parent, "%s", name); - if (retval) { - printk(KERN_WARNING "%s: kobject_add error: %d\n", - __func__, retval); - kobject_put(kobj); - kobj = NULL; - } - return kobj; -} -EXPORT_SYMBOL_GPL(kobject_create_and_add); - -/** - * kset_init - initialize a kset for use - * @k: kset - */ -void kset_init(struct kset *k) -{ - kobject_init_internal(&k->kobj); - INIT_LIST_HEAD(&k->list); - spin_lock_init(&k->list_lock); -} - -/* 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, -}; - -/** - * kset_register - initialize and add a kset. - * @k: kset. - */ -int kset_register(struct kset *k) -{ - int err; - - if (!k) - return -EINVAL; - - kset_init(k); - err = kobject_add_internal(&k->kobj); - if (err) - return err; - kobject_uevent(&k->kobj, KOBJ_ADD); - return 0; -} - -/** - * kset_unregister - remove a kset. - * @k: kset. - */ -void kset_unregister(struct kset *k) -{ - if (!k) - return; - kobject_put(&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 kobject *k; - struct kobject *ret = NULL; - - spin_lock(&kset->list_lock); - list_for_each_entry(k, &kset->list, entry) { - if (kobject_name(k) && !strcmp(kobject_name(k), name)) { - ret = kobject_get(k); - break; - } - } - spin_unlock(&kset->list_lock); - return ret; -} - -static void kset_release(struct kobject *kobj) -{ - struct kset *kset = container_of(kobj, struct kset, kobj); - pr_debug("kobject: '%s' (%p): %s\n", - kobject_name(kobj), kobj, __func__); - kfree(kset); -} - -static struct kobj_type kset_ktype = { - .sysfs_ops = &kobj_sysfs_ops, - .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; - - /* - * The kobject of this kset will have a type of kset_ktype and belong to - * no kset itself. That way we can properly free it when it is - * finished being used. - */ - kset->kobj.ktype = &kset_ktype; - 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); - -EXPORT_SYMBOL(kobject_get); -EXPORT_SYMBOL(kobject_put); -EXPORT_SYMBOL(kobject_del); - -EXPORT_SYMBOL(kset_register); -EXPORT_SYMBOL(kset_unregister); |