linux-kernel - [PATCH v2 5/8] iio: adc: stm32-dfsdm: enable hw consumer

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Date:   Thu, 21 Mar 2019 17:47:26 +0100
From:   Fabrice Gasnier <fabrice.gasnier@...com>
To:     <jic23@...nel.org>
CC:     <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <mcoquelin.stm32@...il.com>,
        <alexandre.torgue@...com>, <fabrice.gasnier@...com>,
        <linux-iio@...r.kernel.org>, <lars@...afoo.de>, <knaack.h@....de>,
        <pmeerw@...erw.net>, <linux-stm32@...md-mailman.stormreply.com>,
        <arnaud.pouliquen@...com>, <olivier.moysan@...com>
Subject: [PATCH v2 5/8] 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@...com>
---
 drivers/iio/adc/stm32-dfsdm-adc.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/adc/stm32-dfsdm-adc.c b/drivers/iio/adc/stm32-dfsdm-adc.c
index 66e2ea0..b491424 100644
--- 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 @@ static int stm32_dfsdm_postenable(struct iio_dev *indio_dev)
 	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;
 }
 
-- 
2.7.4