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iio: pressure: dps310: support negative temperature values

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The current implementation interprets negative values returned from
`dps310_calculate_temp` as error codes.
This has a side effect that when negative temperature values are
calculated, they are interpreted as error.

Fix this by using the return value only for error handling and passing a
pointer for the value.

Fixes: ba6ec48e76 ("iio: Add driver for Infineon DPS310")
Signed-off-by: Thomas Haemmerle <thomas.haemmerle@leica-geosystems.com>
Link: https://lore.kernel.org/r/20240415105030.1161770-2-thomas.haemmerle@leica-geosystems.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Thomas Haemmerle 2024-04-15 12:50:27 +02:00 committed by Jonathan Cameron
parent 499eb31151
commit 9dd6b32e76
1 changed files with 6 additions and 5 deletions
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11
drivers/iio/pressure/dps310.c
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@ -730,7 +730,7 @@ static int dps310_read_pressure(struct dps310_data *data, int *val, int *val2,
}
}
static int dps310_calculate_temp(struct dps310_data *data)
static int dps310_calculate_temp(struct dps310_data *data, int *val)
{
s64 c0;
s64 t;
@ -746,7 +746,9 @@ static int dps310_calculate_temp(struct dps310_data *data)
t = c0 + ((s64)data->temp_raw * (s64)data->c1);
/* Convert to milliCelsius and scale the temperature */
return (int)div_s64(t * 1000LL, kt);
*val = (int)div_s64(t * 1000LL, kt);
return 0;
}
static int dps310_read_temp(struct dps310_data *data, int *val, int *val2,
@ -768,11 +770,10 @@ static int dps310_read_temp(struct dps310_data *data, int *val, int *val2,
if (rc)
return rc;
rc = dps310_calculate_temp(data);
if (rc < 0)
rc = dps310_calculate_temp(data, val);
if (rc)
return rc;
*val = rc;
return IIO_VAL_INT;
case IIO_CHAN_INFO_OVERSAMPLING_RATIO: