static int pctv452e_rc_query(struct dvb_usb_device *d)
{
    struct pctv452e_state *state = (struct pctv452e_state *)d->priv;
    u8 b[CMD_BUFFER_SIZE];
    u8 rx[PCTV_ANSWER_LEN];
    int ret, i;
    u8 id = state->c++;

    /* prepare command header  */
    b[0] = SYNC_BYTE_OUT;
    b[1] = id;
    b[2] = PCTV_CMD_IR;
    b[3] = 0;

    /* send ir request */
    ret = dvb_usb_generic_rw(d, b, 4, rx, PCTV_ANSWER_LEN, 0);
    if (ret != 0)
        return ret;

    if (debug > 3) {