#ifndef __NET_NCSI_H
  #define __NET_NCSI_H
  
  /*
   * The NCSI device states seen from external. More NCSI device states are
   * only visible internally (in net/ncsi/internal.h). When the NCSI device
   * is registered, it's in ncsi_dev_state_registered state. The state
   * ncsi_dev_state_start is used to drive to choose active package and
   * channel. After that, its state is changed to ncsi_dev_state_functional.
   *
   * The state ncsi_dev_state_stop helps to shut down the currently active
   * package and channel while ncsi_dev_state_config helps to reconfigure
   * them.
   */
  enum {
  	ncsi_dev_state_registered	= 0x0000,
  	ncsi_dev_state_functional	= 0x0100,
  	ncsi_dev_state_probe		= 0x0200,
  	ncsi_dev_state_config		= 0x0300,
  	ncsi_dev_state_suspend		= 0x0400,
  };
  
  struct ncsi_dev {
  	int               state;
  	int		  link_up;
  	struct net_device *dev;
  	void		  (*handler)(struct ncsi_dev *ndev);
  };
  
  #ifdef CONFIG_NET_NCSI
  struct ncsi_dev *ncsi_register_dev(struct net_device *dev,
  				   void (*notifier)(struct ncsi_dev *nd));

  int ncsi_start_dev(struct ncsi_dev *nd);

  void ncsi_stop_dev(struct ncsi_dev *nd);

  void ncsi_unregister_dev(struct ncsi_dev *nd);
  #else /* !CONFIG_NET_NCSI */
  static inline struct ncsi_dev *ncsi_register_dev(struct net_device *dev,
  					void (*notifier)(struct ncsi_dev *nd))
  {
  	return NULL;
  }

  static inline int ncsi_start_dev(struct ncsi_dev *nd)
  {
  	return -ENOTTY;
  }

  static void ncsi_stop_dev(struct ncsi_dev *nd)
  {
  }

  static inline void ncsi_unregister_dev(struct ncsi_dev *nd)
  {
  }
  #endif /* CONFIG_NET_NCSI */
  
  #endif /* __NET_NCSI_H */