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 <[email protected]>
---
drivers/iio/adc/stm32-adc.c | 27 +++++++++++++++++----------
1 file changed, 17 insertions(+), 10 deletions(-)
diff --git a/drivers/iio/adc/stm32-adc.c b/drivers/iio/adc/stm32-adc.c
index a68ecbda6480..f13c112f540f 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);
@@ -1979,10 +1979,10 @@ 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);
@@ -1990,10 +1990,15 @@ 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;
}
}
@@ -2030,7 +2035,9 @@ 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);
--
2.25.1
On 6/9/22 11:58, Olivier Moysan wrote:
> 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 <[email protected]>
Hi Olivier,
You can add my:
Reviewed-by: Fabrice Gasnier <[email protected]>
Thanks,
Fabrice
> ---
> drivers/iio/adc/stm32-adc.c | 27 +++++++++++++++++----------
> 1 file changed, 17 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/iio/adc/stm32-adc.c b/drivers/iio/adc/stm32-adc.c
> index a68ecbda6480..f13c112f540f 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);
> @@ -1979,10 +1979,10 @@ 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);
> @@ -1990,10 +1990,15 @@ 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;
> }
> }
>
> @@ -2030,7 +2035,9 @@ 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);
On Thu, 9 Jun 2022 11:58:56 +0200
Olivier Moysan <[email protected]> wrote:
> 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")
>
No line break here. Fixes is part of the tag block (and a pull request sent with
this gap will get rejected). Fixed up whilst applying.
> Signed-off-by: Olivier Moysan <[email protected]>
Applied to the fixes-togreg branch of iiogit.
I initially wondered if using -ENOENT for this was safe in that it couldn't
come from anywhere else. Looks like it is given how little this function does
so fair enough.
Thanks,
Jonathan
> ---
> drivers/iio/adc/stm32-adc.c | 27 +++++++++++++++++----------
> 1 file changed, 17 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/iio/adc/stm32-adc.c b/drivers/iio/adc/stm32-adc.c
> index a68ecbda6480..f13c112f540f 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);
> @@ -1979,10 +1979,10 @@ 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);
> @@ -1990,10 +1990,15 @@ 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;
> }
> }
>
> @@ -2030,7 +2035,9 @@ 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);