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Subject[PATCH] iio: at91-sama5d2_adc: fix iio_triggered_buffer_{predisable,postenable} positions
Date
The iio_triggered_buffer_{predisable,postenable} functions attach/detach
poll functions.

The iio_triggered_buffer_postenable() should be called first to attach the
poll function, and then the driver can init the data to be triggered.

Similarly, iio_triggered_buffer_predisable() should be called last to first
disable the data (to be triggered) and then the poll function should be
detached.

For this driver, the predisable & postenable hooks are also need to take
into consideration the touchscreen, so the hooks need to be put in places
that avoid the code for that cares about it.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
---
drivers/iio/adc/at91-sama5d2_adc.c | 19 ++++++++++---------
1 file changed, 10 insertions(+), 9 deletions(-)

diff --git a/drivers/iio/adc/at91-sama5d2_adc.c b/drivers/iio/adc/at91-sama5d2_adc.c
index e1850f3d5cf3..ac3e5c4c9840 100644
--- a/drivers/iio/adc/at91-sama5d2_adc.c
+++ b/drivers/iio/adc/at91-sama5d2_adc.c
@@ -889,20 +889,24 @@ static int at91_adc_buffer_postenable(struct iio_dev *indio_dev)
if (!(indio_dev->currentmode & INDIO_ALL_TRIGGERED_MODES))
return -EINVAL;

+ ret = iio_triggered_buffer_postenable(indio_dev);
+ if (ret)
+ return ret;
+
/* we continue with the triggered buffer */
ret = at91_adc_dma_start(indio_dev);
if (ret) {
dev_err(&indio_dev->dev, "buffer postenable failed\n");
+ iio_triggered_buffer_predisable(indio_dev);
return ret;
}

- return iio_triggered_buffer_postenable(indio_dev);
+ return 0;
}

static int at91_adc_buffer_predisable(struct iio_dev *indio_dev)
{
struct at91_adc_state *st = iio_priv(indio_dev);
- int ret;
u8 bit;

/* check if we are disabling triggered buffer or the touchscreen */
@@ -916,13 +920,8 @@ static int at91_adc_buffer_predisable(struct iio_dev *indio_dev)
if (!(indio_dev->currentmode & INDIO_ALL_TRIGGERED_MODES))
return -EINVAL;

- /* continue with the triggered buffer */
- ret = iio_triggered_buffer_predisable(indio_dev);
- if (ret < 0)
- dev_err(&indio_dev->dev, "buffer predisable failed\n");
-
if (!st->dma_st.dma_chan)
- return ret;
+ goto out;

/* if we are using DMA we must clear registers and end DMA */
dmaengine_terminate_sync(st->dma_st.dma_chan);
@@ -949,7 +948,9 @@ static int at91_adc_buffer_predisable(struct iio_dev *indio_dev)

/* read overflow register to clear possible overflow status */
at91_adc_readl(st, AT91_SAMA5D2_OVER);
- return ret;
+
+out:
+ return iio_triggered_buffer_predisable(indio_dev);
}

static const struct iio_buffer_setup_ops at91_buffer_setup_ops = {
--
2.20.1
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