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authorOlivier Moysan <olivier.moysan@st.com>2019-11-27 14:10:08 +0100
committerJonathan Cameron <Jonathan.Cameron@huawei.com>2020-01-13 22:00:03 +0000
commitf81ec5bf0cab29693980abbc983d0971e0efb0ea (patch)
tree3bba1925c3b5928302fa36a5abe22b72e320e2a6 /drivers/iio/adc
parentdc26935fb60e8da8d59655dd2ec0de47b20d7d8f (diff)
downloadlinux-f81ec5bf0cab29693980abbc983d0971e0efb0ea.tar.gz
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>
Diffstat (limited to 'drivers/iio/adc')
-rw-r--r--drivers/iio/adc/stm32-dfsdm-adc.c32
1 files changed, 19 insertions, 13 deletions
diff --git a/drivers/iio/adc/stm32-dfsdm-adc.c b/drivers/iio/adc/stm32-dfsdm-adc.c
index 1c9b05d11dc5..2aad2cda6943 100644
--- a/drivers/iio/adc/stm32-dfsdm-adc.c
+++ b/drivers/iio/adc/stm32-dfsdm-adc.c
@@ -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;