From abad398337f038f5822e53c55eff5b0820ef7efe Mon Sep 17 00:00:00 2001 From: Irina Tirdea Date: Wed, 8 Apr 2015 18:26:12 +0300 Subject: [PATCH] iio: pressure: bmp280: fix temp compensation 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 Reviewed-by: Vlad Dogaru Signed-off-by: Jonathan Cameron --- drivers/iio/pressure/bmp280.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/iio/pressure/bmp280.c b/drivers/iio/pressure/bmp280.c index 7c623e2..a2602d8 100644 --- a/drivers/iio/pressure/bmp280.c +++ b/drivers/iio/pressure/bmp280.c @@ -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; } -- 2.7.4