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iio: palmas: shut up warning about calibration mismatch (due to noise)

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Although technically checking for ADC values below 0 is correct,
because they are outside of the calibration values, there is usually
noise which spuriously fills the console log with error messages if
calculated input voltage gets close to 0V.

Ignore small negative calculated values, but clamp them to 0.

Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
Link: https://lore.kernel.org/r/1cee45bfc3fa2ab59dcc17242fb52468035360a1.1646743982.git.hns@goldelico.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
H. Nikolaus Schaller 2022-03-08 13:53:03 +01:00 • committed by Jonathan Cameron
parent 44b0be6eb3
commit a8e1f0ba13
1 changed files with 2 additions and 1 deletions
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3
drivers/iio/adc/palmas_gpadc.c
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@ -376,7 +376,8 @@ static int palmas_gpadc_get_calibrated_code(struct palmas_gpadc *adc,
adc->adc_info[adc_chan].gain_error;
if (val < 0) {
dev_err(adc->dev, "Mismatch with calibration\n");
if (val < -10)
dev_err(adc->dev, "Mismatch with calibration var = %d\n", val);
return 0;
}