diff options
| author | Olivier Moysan <olivier.moysan@st.com> | 2019-11-27 14:10:08 +0100 |
|---|---|---|
| committer | Jonathan Cameron <Jonathan.Cameron@huawei.com> | 2020-01-13 22:00:03 +0000 |
| commit | f81ec5bf0cab29693980abbc983d0971e0efb0ea (patch) | |
| tree | 3bba1925c3b5928302fa36a5abe22b72e320e2a6 /drivers/iio/adc | |
| parent | dc26935fb60e8da8d59655dd2ec0de47b20d7d8f (diff) | |
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.c | 32 |
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; |