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iio: adc: stm32-dfsdm: adapt sampling rate to oversampling ratio 

Update sampling rate when oversampling ratio is changed
through the IIO ABI.

Signed-off-by: Olivier Moysan <olivier.moysan@st.com>
Acked-by: Fabrice Gasnier <fabrice.gasnier@st.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Olivier Moysan 2019-11-27 14:10:08 +01:00 committed by Jonathan Cameron
parent dc26935fb6
commit f81ec5bf0c
1 changed files with 19 additions and 13 deletions
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32
drivers/iio/adc/stm32-dfsdm-adc.c
View File

@ -1221,14 +1221,32 @@ static int stm32_dfsdm_write_raw(struct iio_dev *indio_dev,
unsigned int spi_freq;
int ret = -EINVAL;
switch (ch->src) {
case DFSDM_CHANNEL_SPI_CLOCK_INTERNAL:
spi_freq = adc->dfsdm->spi_master_freq;
break;
case DFSDM_CHANNEL_SPI_CLOCK_INTERNAL_DIV2_FALLING:
case DFSDM_CHANNEL_SPI_CLOCK_INTERNAL_DIV2_RISING:
spi_freq = adc->dfsdm->spi_master_freq / 2;
break;
default:
spi_freq = adc->spi_freq;
}
switch (mask) {
case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
ret = iio_device_claim_direct_mode(indio_dev);
if (ret)
return ret;
ret = stm32_dfsdm_compute_all_osrs(indio_dev, val);
if (!ret)
if (!ret) {
dev_dbg(&indio_dev->dev,
"Sampling rate changed from (%u) to (%u)\n",
adc->sample_freq, spi_freq / val);
adc->oversamp = val;
adc->sample_freq = spi_freq / val;
}
iio_device_release_direct_mode(indio_dev);
return ret;
@ -1240,18 +1258,6 @@ static int stm32_dfsdm_write_raw(struct iio_dev *indio_dev,
if (ret)
return ret;
switch (ch->src) {
case DFSDM_CHANNEL_SPI_CLOCK_INTERNAL:
spi_freq = adc->dfsdm->spi_master_freq;
break;
case DFSDM_CHANNEL_SPI_CLOCK_INTERNAL_DIV2_FALLING:
case DFSDM_CHANNEL_SPI_CLOCK_INTERNAL_DIV2_RISING:
spi_freq = adc->dfsdm->spi_master_freq / 2;
break;
default:
spi_freq = adc->spi_freq;
}
ret = dfsdm_adc_set_samp_freq(indio_dev, val, spi_freq);
iio_device_release_direct_mode(indio_dev);
return ret;