drupal_module__wing/wing.module

<?php
/**
 * @file
 * Workflow - New Generation
 *
 * - States are entities
 * - Worfklows are the bundle entities of states
 * - Transitions are specific fields from state to role_id+state
 * - Any entity type can be subject to a workflow: association is represented by
 *   an entityreference field with specific widget/formatter.
 */
function wing_field_info() {
  $ret = array(
    'wing_transition' => array(
      'label' => t('Wing: Transition'),
      'description' => t('Store access from one workflow state to another.'),
      'settings' => array(),
      'instance_settings' => array(),
      'default_widget' => 'text_textfield',
      'default_formatter' => 'text_default',
//       'default_widget' => 'wing_transition_widget',
//       'default_formatter' => 'wing_transition_default',
//      'no_ui' => FALSE,
    ),
  );
dsm($ret);
  return $ret;
}

function wing_field_widget_info() {
  $ret = array(
    'text_textfield' => array(
      'label' => t('Text field'),
      'field types' => array('text'),
      'settings' => array('size' => 60),
      'behaviors' => array(
        'multiple values' => FIELD_BEHAVIOR_DEFAULT,
        'default value' => FIELD_BEHAVIOR_DEFAULT,
      ),
    ),
  );

  return $ret;
}

/**
 * Implements hook_field_widget_info_alter().
 */
function wing_field_widget_info_alter(&$info) {
  if (module_exists('text')) {
    $info['text_textfield']['field types'][] = 'wing_transition';
  }
}