/**
 * @brief   Notification of data removed from the input queue.
 *
 * @param[in] qp        the queue pointer.
 */
static void inotify(io_queue_t *qp) {
  size_t n, maxsize;
  SerialUSBDriver *sdup = qGetLink(qp);

  /* If the USB driver is not in the appropriate state then transactions
     must not be started.*/
  if ((usbGetDriverStateI(sdup->config->usbp) != USB_ACTIVE) ||
      (sdup->state != SDU_READY)) {
    return;
  }

  /* If there is in the queue enough space to hold at least one packet and
     a transaction is not yet started then a new transaction is started for
     the available space.*/
  maxsize = sdup->config->usbp->epc[sdup->config->bulk_out]->out_maxsize;
  if (!usbGetReceiveStatusI(sdup->config->usbp, sdup->config->bulk_out)) {
    if ((n = iqGetEmptyI(&sdup->iqueue)) >= maxsize) {
      osalSysUnlock();

      n = (n / maxsize) * maxsize;
      usbPrepareQueuedReceive(sdup->config->usbp,
                              sdup->config->bulk_out,
                              &sdup->iqueue, n);

      osalSysLock();
      (void) usbStartReceiveI(sdup->config->usbp, sdup->config->bulk_out);
    }
  }
}
/**
 * @brief   Notification of data inserted into the output queue.
 *
 * @param[in] qp        the queue pointer.
 */
static void onotify(io_queue_t *qp) {
  size_t n;
  SerialUSBDriver *sdup = qGetLink(qp);

  /* If the USB driver is not in the appropriate state then transactions
     must not be started.*/
  if ((usbGetDriverStateI(sdup->config->usbp) != USB_ACTIVE) ||
      (sdup->state != SDU_READY)) {
    return;
  }

  /* If there is not an ongoing transaction and the output queue contains
     data then a new transaction is started.*/
  if (!usbGetTransmitStatusI(sdup->config->usbp, sdup->config->bulk_in)) {
    if ((n = oqGetFullI(&sdup->oqueue)) > 0U) {
      osalSysUnlock();

      usbPrepareQueuedTransmit(sdup->config->usbp,
                               sdup->config->bulk_in,
                               &sdup->oqueue, n);

      osalSysLock();
      (void) usbStartTransmitI(sdup->config->usbp, sdup->config->bulk_in);
    }
  }
}
/**
 * @brief   Notification of data inserted into the output queue.
 *
 * @param[in] qp        the queue pointer.
 */
static void onotify(io_queue_t *qp) {
  size_t n;
  HIDDebugDriver *hiddp = qGetLink(qp);

  /* If the USB driver is not in the appropriate state then transactions
   * must not be started.*/
  if((usbGetDriverStateI(hiddp->config->usbp) != USB_ACTIVE) ||
     (hiddp->state != HIDDEBUG_READY)) {
    return;
  }

  /* If there is not an ongoing transaction and the output queue contains
   * enough data then a new transaction is started.*/
  if(!usbGetTransmitStatusI(hiddp->config->usbp, hiddp->config->ep_in)) {
    if((n = oqGetFullI(&hiddp->oqueue)) >= DEBUG_TX_SIZE) {
      osalSysUnlock();

      usbPrepareQueuedTransmit(hiddp->config->usbp,
                               hiddp->config->ep_in,
                               &hiddp->oqueue, DEBUG_TX_SIZE);

      osalSysLock();
      (void)usbStartTransmitI(hiddp->config->usbp, hiddp->config->ep_in);
    }
  }
}