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authorOlivier Moysan <olivier.moysan@foss.st.com>2022-06-09 11:58:56 +0200
committerJonathan Cameron <Jonathan.Cameron@huawei.com>2022-06-19 17:22:49 +0100
commitbc05f30fc24705cd023f38659303376eaa5767df (patch)
tree05d966ff2b61928bb5f9fc41c48c3f07e7b172a5
parent106b391e1b859100a3f38f0ad874236e9be06bde (diff)
iio: adc: stm32: fix vrefint wrong calibration value handling
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: 0e346b2cfa85 ("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>
-rw-r--r--drivers/iio/adc/stm32-adc.c27
1 files changed, 17 insertions, 10 deletions
diff --git a/drivers/iio/adc/stm32-adc.c b/drivers/iio/adc/stm32-adc.c
index 8c5f05f593ab..11ef873d6453 100644
--- a/drivers/iio/adc/stm32-adc.c
+++ b/drivers/iio/adc/stm32-adc.c
@@ -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);