irda_sir_frame
n = irda_sir_frame(sc->sc_buffer, sizeof(sc->sc_buffer), uio,
int irda_sir_frame(u_int8_t *, u_int, struct uio *, u_int);
n = irda_sir_frame(sc->sc_xmit_bufs[sc->sc_txs], TX_BUF_SZ, uio,
sirlength = irda_sir_frame(wrbuf, MAX_UDSIR_OUTPUT_FRAME,
sirlength = irda_sir_frame(&wrbuf[STIR_OUTPUT_HEADER_SIZE],