ITE_TX_FIFO_LEN
u8 last_sent[ITE_TX_FIFO_LEN];
fifo_avail = ITE_TX_FIFO_LEN - dev->params->get_tx_used_slots(dev);
last_idx &= (ITE_TX_FIFO_LEN);
fifo_avail = ITE_TX_FIFO_LEN - dev->params->get_tx_used_slots(dev);
(fifo_avail = ITE_TX_FIFO_LEN - dev->params->get_tx_used_slots(dev)) >= 8);
last_idx &= (ITE_TX_FIFO_LEN - 1);