ath_hal_chan2wmode
WIRELESS_MODE mode = ath_hal_chan2wmode(ah, chan);
WIRELESS_MODE mode = ath_hal_chan2wmode(ah, chan);
clks = usecs * CLOCK_RATE[ath_hal_chan2wmode(ah, c)];
psec = (clks * 1000000ULL) / CLOCK_RATE[ath_hal_chan2wmode(ah, c)];