  extern void cb_out_0(struct pcbit_dev *dev, struct pcbit_chan *chan,        struct callb_data *data);  extern void cb_out_0(struct pcbit_dev *dev, struct pcbit_chan *chan,        struct callb_data *data);  extern void cb_in_0(struct pcbit_dev *dev, struct pcbit_chan *chan,       struct callb_data *data); extern void cb_in_0(struct pcbit_dev *dev, struct pcbit_chan *chan,       struct callb_data *data); extern void cb_in_0(struct pcbit_dev *dev, struct pcbit_chan *chan,       struct callb_data *data);  extern void cb_disc_0(struct pcbit_dev *dev, struct pcbit_chan *chan,         struct callb_data *data); extern void cb_disc_0(struct pcbit_dev *dev, struct pcbit_chan *chan,         struct callb_data *data); extern void cb_disc_0(struct pcbit_dev *dev, struct pcbit_chan *chan,         struct callb_data *data);  extern void cb_