au1xxx_get_dma_residue
EXPORT_SYMBOL_GPL(au1xxx_get_dma_residue);
u32 au1xxx_get_dma_residue(u32 chanid);
hw->rx_count = hw->len - au1xxx_get_dma_residue(hw->dma_rx_ch);
hw->tx_count = hw->len - au1xxx_get_dma_residue(hw->dma_tx_ch);