+SR_PRIV int kecheng_kc_330b_handle_events(int fd, int revents, void *cb_data);
+SR_PRIV void kecheng_kc_330b_receive_transfer(struct libusb_transfer *transfer);
+SR_PRIV int kecheng_kc_330b_configure(const struct sr_dev_inst *sdi);
+SR_PRIV int kecheng_kc_330b_set_date_time(struct sr_dev_inst *sdi);
+SR_PRIV int kecheng_kc_330b_recording_get(const struct sr_dev_inst *sdi,
+ gboolean *tmp);
+SR_PRIV int kecheng_kc_330b_status_get(const struct sr_dev_inst *sdi,
+ int *status);
+SR_PRIV int kecheng_kc_330b_log_info_get(const struct sr_dev_inst *sdi,
+ unsigned char *buf);