SL811_HOST_BUF
sl811->active_a = start(sl811, SL811_EP_A(SL811_HOST_BUF));
sl811->active_b = start(sl811, SL811_EP_B(SL811_HOST_BUF));
done(sl811, sl811->active_a, SL811_EP_A(SL811_HOST_BUF));
done(sl811, sl811->active_b, SL811_EP_B(SL811_HOST_BUF));