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iio: adc: stm32-dfsdm: claim direct mode for raw read and settings 

Claim direct mode to ensure no buffer mode is in use for:
- single conversion
- sample rate setting (must be set when filter isn't enabled).
- oversampling ratio (must be set when filter isn't enabled).

Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
hifive-unleashed-5.2
Fabrice Gasnier 2019-03-21 17:47:29 +01:00 committed by Jonathan Cameron
parent 11646e81d7
commit 37ada026be
1 changed files with 16 additions and 1 deletions
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17
drivers/iio/adc/stm32-dfsdm-adc.c
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@ -1039,16 +1039,23 @@ static int stm32_dfsdm_write_raw(struct iio_dev *indio_dev,
switch (mask) {
case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
ret = iio_device_claim_direct_mode(indio_dev);
if (ret)
return ret;
ret = stm32_dfsdm_set_osrs(fl, 0, val);
if (!ret)
adc->oversamp = val;
iio_device_release_direct_mode(indio_dev);
return ret;
case IIO_CHAN_INFO_SAMP_FREQ:
if (!val)
return -EINVAL;
ret = iio_device_claim_direct_mode(indio_dev);
if (ret)
return ret;
switch (ch->src) {
case DFSDM_CHANNEL_SPI_CLOCK_INTERNAL:
spi_freq = adc->dfsdm->spi_master_freq;
@ -1070,9 +1077,11 @@ static int stm32_dfsdm_write_raw(struct iio_dev *indio_dev,
if (ret < 0) {
dev_err(&indio_dev->dev,
"Not able to find parameter that match!\n");
iio_device_release_direct_mode(indio_dev);
return ret;
}
adc->sample_freq = val;
iio_device_release_direct_mode(indio_dev);
return 0;
}
@ -1089,11 +1098,15 @@ static int stm32_dfsdm_read_raw(struct iio_dev *indio_dev,
switch (mask) {
case IIO_CHAN_INFO_RAW:
ret = iio_device_claim_direct_mode(indio_dev);
if (ret)
return ret;
ret = iio_hw_consumer_enable(adc->hwc);
if (ret < 0) {
dev_err(&indio_dev->dev,
"%s: IIO enable failed (channel %d)\n",
__func__, chan->channel);
iio_device_release_direct_mode(indio_dev);
return ret;
}
ret = stm32_dfsdm_single_conv(indio_dev, chan, val);
@ -1102,8 +1115,10 @@ static int stm32_dfsdm_read_raw(struct iio_dev *indio_dev,
dev_err(&indio_dev->dev,
"%s: Conversion failed (channel %d)\n",
__func__, chan->channel);
iio_device_release_direct_mode(indio_dev);
return ret;
}
iio_device_release_direct_mode(indio_dev);
return IIO_VAL_INT;
case IIO_CHAN_INFO_OVERSAMPLING_RATIO: