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iio: adc: stm32: fix vrefint wrong calibration value handling

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If the vrefint calibration is zero, the vrefint channel output value
cannot be computed. Currently, in such case, the raw conversion value
is returned, which is not relevant.
Do not expose the vrefint channel when the output value cannot be
computed, instead.

Fixes: 0e346b2cfa ("iio: adc: stm32-adc: add vrefint calibration support")
Signed-off-by: Olivier Moysan <olivier.moysan@foss.st.com>
Reviewed-by: Fabrice Gasnier <fabrice.gasnier@foss.st.com>
Link: https://lore.kernel.org/r/20220609095856.376961-1-olivier.moysan@foss.st.com
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Olivier Moysan 2022-06-09 11:58:56 +02:00 committed by Jonathan Cameron
parent 106b391e1b
commit bc05f30fc2
1 changed files with 17 additions and 10 deletions
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27
drivers/iio/adc/stm32-adc.c
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@ -1365,7 +1365,7 @@ static int stm32_adc_read_raw(struct iio_dev *indio_dev,
else
ret = -EINVAL;
if (mask == IIO_CHAN_INFO_PROCESSED && adc->vrefint.vrefint_cal)
if (mask == IIO_CHAN_INFO_PROCESSED)
*val = STM32_ADC_VREFINT_VOLTAGE * adc->vrefint.vrefint_cal / *val;
iio_device_release_direct_mode(indio_dev);
@ -1969,10 +1969,10 @@ static int stm32_adc_populate_int_ch(struct iio_dev *indio_dev, const char *ch_n
for (i = 0; i < STM32_ADC_INT_CH_NB; i++) {
if (!strncmp(stm32_adc_ic[i].name, ch_name, STM32_ADC_CH_SZ)) {
adc->int_ch[i] = chan;
if (stm32_adc_ic[i].idx != STM32_ADC_INT_CH_VREFINT)
continue;
if (stm32_adc_ic[i].idx != STM32_ADC_INT_CH_VREFINT) {
adc->int_ch[i] = chan;
break;
}
/* Get calibration data for vrefint channel */
ret = nvmem_cell_read_u16(&indio_dev->dev, "vrefint", &vrefint);
@ -1980,10 +1980,15 @@ static int stm32_adc_populate_int_ch(struct iio_dev *indio_dev, const char *ch_n
return dev_err_probe(indio_dev->dev.parent, ret,
"nvmem access error\n");
}
if (ret == -ENOENT)
dev_dbg(&indio_dev->dev, "vrefint calibration not found\n");
else
adc->vrefint.vrefint_cal = vrefint;
if (ret == -ENOENT) {
dev_dbg(&indio_dev->dev, "vrefint calibration not found. Skip vrefint channel\n");
return ret;
} else if (!vrefint) {
dev_dbg(&indio_dev->dev, "Null vrefint calibration value. Skip vrefint channel\n");
return -ENOENT;
}
adc->int_ch[i] = chan;
adc->vrefint.vrefint_cal = vrefint;
}
}
@ -2020,7 +2025,9 @@ static int stm32_adc_generic_chan_init(struct iio_dev *indio_dev,
}
strncpy(adc->chan_name[val], name, STM32_ADC_CH_SZ);
ret = stm32_adc_populate_int_ch(indio_dev, name, val);
if (ret)
if (ret == -ENOENT)
continue;
else if (ret)
goto err;
} else if (ret != -EINVAL) {
dev_err(&indio_dev->dev, "Invalid label %d\n", ret);