char *buf)
{
struct class_attribute *class_attr = to_class_attr(attr);
- struct class_private *cp = to_class(kobj);
+ struct subsys_private *cp = to_subsys_private(kobj);
ssize_t ret = -EIO;
if (class_attr->show)
- ret = class_attr->show(cp->class, buf);
+ ret = class_attr->show(cp->class, class_attr, buf);
return ret;
}
const char *buf, size_t count)
{
struct class_attribute *class_attr = to_class_attr(attr);
- struct class_private *cp = to_class(kobj);
+ struct subsys_private *cp = to_subsys_private(kobj);
ssize_t ret = -EIO;
if (class_attr->store)
- ret = class_attr->store(cp->class, buf, count);
+ ret = class_attr->store(cp->class, class_attr, buf, count);
return ret;
}
+static const void *class_attr_namespace(struct kobject *kobj,
+ const struct attribute *attr)
+{
+ struct class_attribute *class_attr = to_class_attr(attr);
+ struct subsys_private *cp = to_subsys_private(kobj);
+ const void *ns = NULL;
+
+ if (class_attr->namespace)
+ ns = class_attr->namespace(cp->class, class_attr);
+ return ns;
+}
+
static void class_release(struct kobject *kobj)
{
- struct class_private *cp = to_class(kobj);
+ struct subsys_private *cp = to_subsys_private(kobj);
struct class *class = cp->class;
pr_debug("class '%s': release.\n", class->name);
else
pr_debug("class '%s' does not have a release() function, "
"be careful\n", class->name);
+
+ kfree(cp);
+}
+
+static const struct kobj_ns_type_operations *class_child_ns_type(struct kobject *kobj)
+{
+ struct subsys_private *cp = to_subsys_private(kobj);
+ struct class *class = cp->class;
+
+ return class->ns_type;
}
-static struct sysfs_ops class_sysfs_ops = {
- .show = class_attr_show,
- .store = class_attr_store,
+static const struct sysfs_ops class_sysfs_ops = {
+ .show = class_attr_show,
+ .store = class_attr_store,
+ .namespace = class_attr_namespace,
};
static struct kobj_type class_ktype = {
.sysfs_ops = &class_sysfs_ops,
.release = class_release,
+ .child_ns_type = class_child_ns_type,
};
-/* Hotplug events for classes go to the class class_subsys */
+/* Hotplug events for classes go to the class subsys */
static struct kset *class_kset;
{
int error;
if (cls)
- error = sysfs_create_file(&cls->p->class_subsys.kobj,
+ error = sysfs_create_file(&cls->p->subsys.kobj,
&attr->attr);
else
error = -EINVAL;
void class_remove_file(struct class *cls, const struct class_attribute *attr)
{
if (cls)
- sysfs_remove_file(&cls->p->class_subsys.kobj, &attr->attr);
+ sysfs_remove_file(&cls->p->subsys.kobj, &attr->attr);
}
static struct class *class_get(struct class *cls)
{
if (cls)
- kset_get(&cls->p->class_subsys);
+ kset_get(&cls->p->subsys);
return cls;
}
static void class_put(struct class *cls)
{
if (cls)
- kset_put(&cls->p->class_subsys);
+ kset_put(&cls->p->subsys);
}
static int add_class_attrs(struct class *cls)
}
}
+static void klist_class_dev_get(struct klist_node *n)
+{
+ struct device *dev = container_of(n, struct device, knode_class);
+
+ get_device(dev);
+}
+
+static void klist_class_dev_put(struct klist_node *n)
+{
+ struct device *dev = container_of(n, struct device, knode_class);
+
+ put_device(dev);
+}
+
int __class_register(struct class *cls, struct lock_class_key *key)
{
- struct class_private *cp;
+ struct subsys_private *cp;
int error;
pr_debug("device class '%s': registering\n", cls->name);
cp = kzalloc(sizeof(*cp), GFP_KERNEL);
if (!cp)
return -ENOMEM;
- INIT_LIST_HEAD(&cp->class_devices);
- INIT_LIST_HEAD(&cp->class_interfaces);
- kset_init(&cp->class_dirs);
- __mutex_init(&cp->class_mutex, "struct class mutex", key);
- error = kobject_set_name(&cp->class_subsys.kobj, "%s", cls->name);
+ klist_init(&cp->klist_devices, klist_class_dev_get, klist_class_dev_put);
+ INIT_LIST_HEAD(&cp->interfaces);
+ kset_init(&cp->glue_dirs);
+ __mutex_init(&cp->mutex, "subsys mutex", key);
+ error = kobject_set_name(&cp->subsys.kobj, "%s", cls->name);
if (error) {
kfree(cp);
return error;
if (!cls->dev_kobj)
cls->dev_kobj = sysfs_dev_char_kobj;
-#if defined(CONFIG_SYSFS_DEPRECATED) && defined(CONFIG_BLOCK)
+#if defined(CONFIG_BLOCK)
/* let the block class directory show up in the root of sysfs */
- if (cls != &block_class)
- cp->class_subsys.kobj.kset = class_kset;
+ if (!sysfs_deprecated || cls != &block_class)
+ cp->subsys.kobj.kset = class_kset;
#else
- cp->class_subsys.kobj.kset = class_kset;
+ cp->subsys.kobj.kset = class_kset;
#endif
- cp->class_subsys.kobj.ktype = &class_ktype;
+ cp->subsys.kobj.ktype = &class_ktype;
cp->class = cls;
cls->p = cp;
- error = kset_register(&cp->class_subsys);
+ error = kset_register(&cp->subsys);
if (error) {
kfree(cp);
return error;
{
pr_debug("device class '%s': unregistering\n", cls->name);
remove_class_attrs(cls);
- kset_unregister(&cls->p->class_subsys);
+ kset_unregister(&cls->p->subsys);
}
static void class_create_release(struct class *cls)
* This is used to create a struct class pointer that can then be used
* in calls to device_create().
*
+ * Returns &struct class pointer on success, or ERR_PTR() on error.
+ *
* Note, the pointer created here is to be destroyed when finished by
* making a call to class_destroy().
*/
class_unregister(cls);
}
-#ifdef CONFIG_SYSFS_DEPRECATED
-char *make_class_name(const char *name, struct kobject *kobj)
+/**
+ * class_dev_iter_init - initialize class device iterator
+ * @iter: class iterator to initialize
+ * @class: the class we wanna iterate over
+ * @start: the device to start iterating from, if any
+ * @type: device_type of the devices to iterate over, NULL for all
+ *
+ * Initialize class iterator @iter such that it iterates over devices
+ * of @class. If @start is set, the list iteration will start there,
+ * otherwise if it is NULL, the iteration starts at the beginning of
+ * the list.
+ */
+void class_dev_iter_init(struct class_dev_iter *iter, struct class *class,
+ struct device *start, const struct device_type *type)
{
- char *class_name;
- int size;
+ struct klist_node *start_knode = NULL;
- size = strlen(name) + strlen(kobject_name(kobj)) + 2;
+ if (start)
+ start_knode = &start->knode_class;
+ klist_iter_init_node(&class->p->klist_devices, &iter->ki, start_knode);
+ iter->type = type;
+}
+EXPORT_SYMBOL_GPL(class_dev_iter_init);
- class_name = kmalloc(size, GFP_KERNEL);
- if (!class_name)
- return NULL;
+/**
+ * class_dev_iter_next - iterate to the next device
+ * @iter: class iterator to proceed
+ *
+ * Proceed @iter to the next device and return it. Returns NULL if
+ * iteration is complete.
+ *
+ * The returned device is referenced and won't be released till
+ * iterator is proceed to the next device or exited. The caller is
+ * free to do whatever it wants to do with the device including
+ * calling back into class code.
+ */
+struct device *class_dev_iter_next(struct class_dev_iter *iter)
+{
+ struct klist_node *knode;
+ struct device *dev;
- strcpy(class_name, name);
- strcat(class_name, ":");
- strcat(class_name, kobject_name(kobj));
- return class_name;
+ while (1) {
+ knode = klist_next(&iter->ki);
+ if (!knode)
+ return NULL;
+ dev = container_of(knode, struct device, knode_class);
+ if (!iter->type || iter->type == dev->type)
+ return dev;
+ }
}
-#endif
+EXPORT_SYMBOL_GPL(class_dev_iter_next);
+
+/**
+ * class_dev_iter_exit - finish iteration
+ * @iter: class iterator to finish
+ *
+ * Finish an iteration. Always call this function after iteration is
+ * complete whether the iteration ran till the end or not.
+ */
+void class_dev_iter_exit(struct class_dev_iter *iter)
+{
+ klist_iter_exit(&iter->ki);
+}
+EXPORT_SYMBOL_GPL(class_dev_iter_exit);
/**
* class_for_each_device - device iterator
* We check the return of @fn each time. If it returns anything
* other than 0, we break out and return that value.
*
- * Note, we hold class->class_mutex in this function, so it can not be
- * re-acquired in @fn, otherwise it will self-deadlocking. For
- * example, calls to add or remove class members would be verboten.
+ * @fn is allowed to do anything including calling back into class
+ * code. There's no locking restriction.
*/
int class_for_each_device(struct class *class, struct device *start,
void *data, int (*fn)(struct device *, void *))
{
+ struct class_dev_iter iter;
struct device *dev;
int error = 0;
if (!class)
return -EINVAL;
- mutex_lock(&class->p->class_mutex);
- list_for_each_entry(dev, &class->p->class_devices, node) {
- if (start) {
- if (start == dev)
- start = NULL;
- continue;
- }
- dev = get_device(dev);
+ if (!class->p) {
+ WARN(1, "%s called for class '%s' before it was initialized",
+ __func__, class->name);
+ return -EINVAL;
+ }
+
+ class_dev_iter_init(&iter, class, start, NULL);
+ while ((dev = class_dev_iter_next(&iter))) {
error = fn(dev, data);
- put_device(dev);
if (error)
break;
}
- mutex_unlock(&class->p->class_mutex);
+ class_dev_iter_exit(&iter);
return error;
}
*
* Note, you will need to drop the reference with put_device() after use.
*
- * We hold class->class_mutex in this function, so it can not be
- * re-acquired in @match, otherwise it will self-deadlocking. For
- * example, calls to add or remove class members would be verboten.
+ * @fn is allowed to do anything including calling back into class
+ * code. There's no locking restriction.
*/
struct device *class_find_device(struct class *class, struct device *start,
void *data,
int (*match)(struct device *, void *))
{
+ struct class_dev_iter iter;
struct device *dev;
- int found = 0;
if (!class)
return NULL;
+ if (!class->p) {
+ WARN(1, "%s called for class '%s' before it was initialized",
+ __func__, class->name);
+ return NULL;
+ }
- mutex_lock(&class->p->class_mutex);
- list_for_each_entry(dev, &class->p->class_devices, node) {
- if (start) {
- if (start == dev)
- start = NULL;
- continue;
- }
- dev = get_device(dev);
+ class_dev_iter_init(&iter, class, start, NULL);
+ while ((dev = class_dev_iter_next(&iter))) {
if (match(dev, data)) {
- found = 1;
+ get_device(dev);
break;
- } else
- put_device(dev);
+ }
}
- mutex_unlock(&class->p->class_mutex);
+ class_dev_iter_exit(&iter);
- return found ? dev : NULL;
+ return dev;
}
EXPORT_SYMBOL_GPL(class_find_device);
int class_interface_register(struct class_interface *class_intf)
{
struct class *parent;
+ struct class_dev_iter iter;
struct device *dev;
if (!class_intf || !class_intf->class)
if (!parent)
return -EINVAL;
- mutex_lock(&parent->p->class_mutex);
- list_add_tail(&class_intf->node, &parent->p->class_interfaces);
+ mutex_lock(&parent->p->mutex);
+ list_add_tail(&class_intf->node, &parent->p->interfaces);
if (class_intf->add_dev) {
- list_for_each_entry(dev, &parent->p->class_devices, node)
+ class_dev_iter_init(&iter, parent, NULL, NULL);
+ while ((dev = class_dev_iter_next(&iter)))
class_intf->add_dev(dev, class_intf);
+ class_dev_iter_exit(&iter);
}
- mutex_unlock(&parent->p->class_mutex);
+ mutex_unlock(&parent->p->mutex);
return 0;
}
void class_interface_unregister(struct class_interface *class_intf)
{
struct class *parent = class_intf->class;
+ struct class_dev_iter iter;
struct device *dev;
if (!parent)
return;
- mutex_lock(&parent->p->class_mutex);
+ mutex_lock(&parent->p->mutex);
list_del_init(&class_intf->node);
if (class_intf->remove_dev) {
- list_for_each_entry(dev, &parent->p->class_devices, node)
+ class_dev_iter_init(&iter, parent, NULL, NULL);
+ while ((dev = class_dev_iter_next(&iter)))
class_intf->remove_dev(dev, class_intf);
+ class_dev_iter_exit(&iter);
}
- mutex_unlock(&parent->p->class_mutex);
+ mutex_unlock(&parent->p->mutex);
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;
+};
+
+/**
+ * class_compat_register - register a compatibility class
+ * @name: the name of the class
+ *
+ * Compatibility class are meant as a temporary user-space compatibility
+ * workaround when converting a family of class devices to a bus devices.
+ */
+struct class_compat *class_compat_register(const char *name)
+{
+ struct class_compat *cls;
+
+ cls = kmalloc(sizeof(struct class_compat), GFP_KERNEL);
+ if (!cls)
+ return NULL;
+ cls->kobj = kobject_create_and_add(name, &class_kset->kobj);
+ if (!cls->kobj) {
+ kfree(cls);
+ return NULL;
+ }
+ return cls;
+}
+EXPORT_SYMBOL_GPL(class_compat_register);
+
+/**
+ * class_compat_unregister - unregister a compatibility class
+ * @cls: the class to unregister
+ */
+void class_compat_unregister(struct class_compat *cls)
+{
+ kobject_put(cls->kobj);
+ kfree(cls);
+}
+EXPORT_SYMBOL_GPL(class_compat_unregister);
+
+/**
+ * class_compat_create_link - create a compatibility class device link to
+ * a bus device
+ * @cls: the compatibility class
+ * @dev: the target bus device
+ * @device_link: an optional device to which a "device" link should be created
+ */
+int class_compat_create_link(struct class_compat *cls, struct device *dev,
+ struct device *device_link)
+{
+ int error;
+
+ error = sysfs_create_link(cls->kobj, &dev->kobj, dev_name(dev));
+ if (error)
+ return error;
+
+ /*
+ * Optionally add a "device" link (typically to the parent), as a
+ * class device would have one and we want to provide as much
+ * backwards compatibility as possible.
+ */
+ if (device_link) {
+ error = sysfs_create_link(&dev->kobj, &device_link->kobj,
+ "device");
+ if (error)
+ sysfs_remove_link(cls->kobj, dev_name(dev));
+ }
+
+ return error;
+}
+EXPORT_SYMBOL_GPL(class_compat_create_link);
+
+/**
+ * class_compat_remove_link - remove a compatibility class device link to
+ * a bus device
+ * @cls: the compatibility class
+ * @dev: the target bus device
+ * @device_link: an optional device to which a "device" link was previously
+ * created
+ */
+void class_compat_remove_link(struct class_compat *cls, struct device *dev,
+ struct device *device_link)
+{
+ if (device_link)
+ sysfs_remove_link(&dev->kobj, "device");
+ sysfs_remove_link(cls->kobj, dev_name(dev));
+}
+EXPORT_SYMBOL_GPL(class_compat_remove_link);
+
int __init classes_init(void)
{
class_kset = kset_create_and_add("class", NULL, NULL);
Code Review / linux-2.6.git / blobdiff