SR_PRIV uint8_t hung_chang_dso_2100_read_mbox(struct parport *port, float timeout);
SR_PRIV int hung_chang_dso_2100_move_to(const struct sr_dev_inst *sdi, uint8_t target);
SR_PRIV int hung_chang_dso_2100_poll(int fd, int revents, void *cb_data);
SR_PRIV uint8_t hung_chang_dso_2100_read_mbox(struct parport *port, float timeout);
SR_PRIV int hung_chang_dso_2100_move_to(const struct sr_dev_inst *sdi, uint8_t target);
SR_PRIV int hung_chang_dso_2100_poll(int fd, int revents, void *cb_data);