iio: Move attach/detach of the poll func to the core

All devices using a triggered buffer need to attach and detach the trigger
to the device in order to properly work. Instead of doing this in each and
every driver by hand move this into the core.

At this point in time, all drivers should have been resolved to
attach/detach the poll-function in the same order.

This patch removes all explicit calls of iio_triggered_buffer_postenable()
& iio_triggered_buffer_predisable() in all drivers, since the core handles
now the pollfunc attach/detach.

The more peculiar change is for the 'at91-sama5d2_adc' driver, since it's
not immediately obvious that removing the hooks doesn't break anything.
Eugen was able to test on at91-sama5d2-adc driver, sama5d2-xplained board.
All seems to be fine.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Tested-by: Eugen Hristev <eugen.hristev@microchip.com> #for at91-sama5d2-adc
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

1 files changed, 4 insertions, 35 deletions

diff --git a/drivers/iio/adc/stm32-dfsdm-adc.c b/drivers/iio/adc/stm32-dfsdm-adc.c
index 017d1ba4c14e..5e10fb4f3704 100644
--- a/drivers/iio/adc/stm32-dfsdm-adc.c
+++ b/drivers/iio/adc/stm32-dfsdm-adc.c
@@ -995,7 +995,7 @@ static int stm32_dfsdm_update_scan_mode(struct iio_dev *indio_dev,
 	return 0;
 }
 
-static int __stm32_dfsdm_postenable(struct iio_dev *indio_dev)
+static int stm32_dfsdm_postenable(struct iio_dev *indio_dev)
 {
 	struct stm32_dfsdm_adc *adc = iio_priv(indio_dev);
 	int ret;
@@ -1038,30 +1038,7 @@ err_stop_hwc:
 	return ret;
 }
 
-static int stm32_dfsdm_postenable(struct iio_dev *indio_dev)
-{
-	int ret;
-
-	if (indio_dev->currentmode == INDIO_BUFFER_TRIGGERED) {
-		ret = iio_triggered_buffer_postenable(indio_dev);
-		if (ret < 0)
-			return ret;
-	}
-
-	ret = __stm32_dfsdm_postenable(indio_dev);
-	if (ret < 0)
-		goto err_predisable;
-
-	return 0;
-
-err_predisable:
-	if (indio_dev->currentmode == INDIO_BUFFER_TRIGGERED)
-		iio_triggered_buffer_predisable(indio_dev);
-
-	return ret;
-}
-
-static void __stm32_dfsdm_predisable(struct iio_dev *indio_dev)
+static int stm32_dfsdm_predisable(struct iio_dev *indio_dev)
 {
 	struct stm32_dfsdm_adc *adc = iio_priv(indio_dev);
 
@@ -1073,14 +1050,6 @@ static void __stm32_dfsdm_predisable(struct iio_dev *indio_dev)
 
 	if (adc->hwc)
 		iio_hw_consumer_disable(adc->hwc);
-}
-
-static int stm32_dfsdm_predisable(struct iio_dev *indio_dev)
-{
-	__stm32_dfsdm_predisable(indio_dev);
-
-	if (indio_dev->currentmode == INDIO_BUFFER_TRIGGERED)
-		iio_triggered_buffer_predisable(indio_dev);
 
 	return 0;
 }
@@ -1668,7 +1637,7 @@ static int __maybe_unused stm32_dfsdm_adc_suspend(struct device *dev)
 	struct iio_dev *indio_dev = dev_get_drvdata(dev);
 
 	if (iio_buffer_enabled(indio_dev))
-		__stm32_dfsdm_predisable(indio_dev);
+		stm32_dfsdm_predisable(indio_dev);
 
 	return 0;
 }
@@ -1691,7 +1660,7 @@ static int __maybe_unused stm32_dfsdm_adc_resume(struct device *dev)
 	}
 
 	if (iio_buffer_enabled(indio_dev))
-		__stm32_dfsdm_postenable(indio_dev);
+		stm32_dfsdm_postenable(indio_dev);
 
 	return 0;
 }