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iio: pressure: bmp280: fix temp compensation

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Temperature reads on bmp280 device always return 0,
due to a missing step in the compensation formula
(data->tfine is never initialized).

Initialize data->tfine value so we get correct
temperature and pressure values.

Signed-off-by: Irina Tirdea <[email protected]>
Reviewed-by: Vlad Dogaru <[email protected]>
Signed-off-by: Jonathan Cameron <[email protected]>
This commit is contained in:
Irina Tirdea 2015-04-08 18:26:12 +03:00 • committed by Jonathan Cameron
commit abad398337
1 changed files with 1 additions and 0 deletions
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1
drivers/iio/pressure/bmp280.c
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@ -172,6 +172,7 @@ static s32 bmp280_compensate_temp(struct bmp280_data *data,
var2 = (((((adc_temp >> 4) - ((s32)le16_to_cpu(buf[T1]))) *
((adc_temp >> 4) - ((s32)le16_to_cpu(buf[T1])))) >> 12) *
((s32)(s16)le16_to_cpu(buf[T3]))) >> 14;
data->t_fine = var1 + var2;
return (data->t_fine * 5 + 128) >> 8;
}