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ath9k_hw: Add helper function for interpolation

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Also round off interpolated values this would improve power
accuracy by 0.5dB in some cases.

Signed-off-by: Vasanthakumar Thiagarajan <vasanth@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Vasanthakumar Thiagarajan 2010-11-10 05:03:14 -08:00 committed by John W. Linville
parent 15cbbc44cc
commit bc2068020b
1 changed files with 26 additions and 18 deletions
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44
drivers/net/wireless/ath/ath9k/ar9003_eeprom.c
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@ -2982,6 +2982,16 @@ static int ath9k_hw_ar9300_check_eeprom(struct ath_hw *ah)
return 0;
}
static int interpolate(int x, int xa, int xb, int ya, int yb)
{
int bf, factor, plus;
bf = 2 * (yb - ya) * (x - xa) / (xb - xa);
factor = bf / 2;
plus = bf % 2;
return ya + factor + plus;
}
static u32 ath9k_hw_ar9300_get_eeprom(struct ath_hw *ah,
enum eeprom_param param)
{
@ -3614,7 +3624,7 @@ static int ar9003_hw_power_interpolate(int32_t x,
if (hx == lx)
y = ly;
else /* interpolate */
y = ly + (((x - lx) * (hy - ly)) / (hx - lx));
y = interpolate(x, lx, hx, ly, hy);
} else /* only low is good, use it */
y = ly;
} else if (hhave) /* only high is good, use it */
@ -4204,25 +4214,23 @@ static int ar9003_hw_calibration_apply(struct ath_hw *ah, int frequency)
/* so is the high frequency, interpolate */
if (hfrequency[ichain] - frequency < 1000) {
correction[ichain] = lcorrection[ichain] +
(((frequency - lfrequency[ichain]) *
(hcorrection[ichain] -
lcorrection[ichain])) /
(hfrequency[ichain] - lfrequency[ichain]));
correction[ichain] = interpolate(frequency,
lfrequency[ichain],
hfrequency[ichain],
lcorrection[ichain],
hcorrection[ichain]);
temperature[ichain] = ltemperature[ichain] +
(((frequency - lfrequency[ichain]) *
(htemperature[ichain] -
ltemperature[ichain])) /
(hfrequency[ichain] - lfrequency[ichain]));
temperature[ichain] = interpolate(frequency,
lfrequency[ichain],
hfrequency[ichain],
ltemperature[ichain],
htemperature[ichain]);
voltage[ichain] =
lvoltage[ichain] +
(((frequency -
lfrequency[ichain]) * (hvoltage[ichain] -
lvoltage[ichain]))
/ (hfrequency[ichain] -
lfrequency[ichain]));
voltage[ichain] = interpolate(frequency,
lfrequency[ichain],
hfrequency[ichain],
lvoltage[ichain],
hvoltage[ichain]);
}
/* only low is good, use it */
else {