Doesn't work with Editablefields

I'm trying to use editablefields module on multifield subfields to allow editing of elements on the parent nodes view page or within views.

I have things pretty much working except that when editablefields calls entity_save() nothing actually gets written to the database.

entity_save is a no op because we don't have a save method on the entity, no "save callback" is defined for the entity info and MultifieldEntityController does not implement EntityAPIControllerInterface.

I cooked up a save callback that is working in my limited case

1. use $entity->type to figure out the table holding the actual multifield data
2. query the entity_type, bundle, entity_id, language, and delta from the field_data_$type table
3. use the entity_type, bundle and entity_id to load the parent entity
4. copy values from the pseudo entity into the correct field in the parent entity
5. save the parent entity

/**
 * Save a naked psuedo entity, generally called from entity_save.
 * Only tested from editablefields module
 * @param stdClass $entity
 */
function multifield_save_callback(stdClass $entity) {
  // Query the field_data table for information needed to load the parent entity
  $field_name = $entity->type;
  $table = 'field_data_'.$field_name;
  $id_column = $field_name."_id";
  $row = db_select($table, 't')
    ->fields('t', array('entity_type', 'bundle', 'entity_id', 'language', 'delta'))
    ->condition($id_column, $entity->id, '=')
    ->execute()
    ->fetchObject();
  $language = $row->language;
  $delta = $row->delta;

  // Now load the parent entity
  $query = new EntityFieldQuery();
  $result = $query->entityCondition('entity_type', $row->entity_type)
    ->entityCondition('bundle', $row->bundle)
    ->entityCondition('entity_id', $row->entity_id)
    ->execute();

  if (isset($result[$row->entity_type])) {
    $entity_ids = array_keys($result[$row->entity_type]);
    $parent = entity_load_single($row->entity_type, $entity_ids[0]);
  }

  // Set values from the pseudo entity
  foreach ($parent->{$field_name}[$language][$delta] as $key => $value) {
    $parent->{$field_name}[$language][$delta][$key] = $entity->$key;
  }

  // save the parent entity
  entity_save($row->entity_type, $parent);
}

I'm attaching a patch for the code I'm using.

Please note, that I've also applied patches for migrate field handler, views integration, and entity api support before working on this.