tda18271_calc_rf_cal
tda18271_calc_rf_cal(fe, &freq);
tda18271_calc_rf_cal(fe, &freq);
tda18271_calc_rf_cal(fe, &rf_freq[rf]);
if (0 == tda18271_calc_rf_cal(fe, &freq))
extern int tda18271_calc_rf_cal(struct dvb_frontend *fe, u32 *freq);