+SR_PRIV void sr_ser_discard_queued_data(struct sr_serial_dev_inst *serial);
+SR_PRIV size_t sr_ser_has_queued_data(struct sr_serial_dev_inst *serial);
+SR_PRIV void sr_ser_queue_rx_data(struct sr_serial_dev_inst *serial,
+ const uint8_t *data, size_t len);
+SR_PRIV size_t sr_ser_unqueue_rx_data(struct sr_serial_dev_inst *serial,
+ uint8_t *data, size_t len);
+