iio: adc: stm32-dfsdm: enable hw consumer

Optionally enable IIO hw consumer, when provided (e.g. for DFSDM_IIO type).
This is precursor patch to introduce buffer modes.

Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/drivers/iio/adc/stm32-dfsdm-adc.c b/drivers/iio/adc/stm32-dfsdm-adc.c
index 66e2ea0..b491424 100644 (file)
--- a/drivers/iio/adc/stm32-dfsdm-adc.c
+++ b/drivers/iio/adc/stm32-dfsdm-adc.c
@@ -630,9 +630,15 @@ static int stm32_dfsdm_postenable(struct iio_dev *indio_dev)
        /* Reset adc buffer index */
        adc->bufi = 0;
 
+       if (adc->hwc) {
+               ret = iio_hw_consumer_enable(adc->hwc);
+               if (ret < 0)
+                       return ret;
+       }
+
        ret = stm32_dfsdm_start_dfsdm(adc->dfsdm);
        if (ret < 0)
-               return ret;
+               goto err_stop_hwc;
 
        ret = stm32_dfsdm_adc_dma_start(indio_dev);
        if (ret) {
@@ -652,6 +658,9 @@ err_stop_dma:
        stm32_dfsdm_adc_dma_stop(indio_dev);
 stop_dfsdm:
        stm32_dfsdm_stop_dfsdm(adc->dfsdm);
+err_stop_hwc:
+       if (adc->hwc)
+               iio_hw_consumer_disable(adc->hwc);
 
        return ret;
 }
@@ -667,6 +676,9 @@ static int stm32_dfsdm_predisable(struct iio_dev *indio_dev)
 
        stm32_dfsdm_stop_dfsdm(adc->dfsdm);
 
+       if (adc->hwc)
+               iio_hw_consumer_disable(adc->hwc);
+
        return 0;
 }