[PATCH v2 1/2] iio: at91-sama5d2_adc: split at91_adc_current_chan_is_touch() helper

[Alexandru Ardelean]

This change moves the logic to check if the current channel is the
touchscreen channel to a separate helper.
This reduces some code duplication, but the main intent is to re-use this
in the next patches.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@xxxxxxxxxx>
---

This patchset continues discussion:
   https://lore.kernel.org/linux-iio/20191023082508.17583-1-alexandru.ardelean@xxxxxxxxxx/
Apologies for the delay.

Changelog v1 -> v2:
* added patch 'iio: at91-sama5d2_adc: split at91_adc_current_chan_is_touch()
  helper'
* renamed at91_adc_buffer_postenable() -> at91_adc_buffer_preenable()
  - at91_adc_buffer_postenable() - now just calls
    iio_triggered_buffer_postenable() if the channel isn't the touchscreen
    channel
* renamed at91_adc_buffer_predisable() -> at91_adc_buffer_postdisable()
  - at91_adc_buffer_predisable() - now just calls
    iio_triggered_buffer_predisable() if the channel isn't the touchscreen
    channel

 drivers/iio/adc/at91-sama5d2_adc.c | 31 +++++++++++++++---------------
 1 file changed, 15 insertions(+), 16 deletions(-)

diff --git a/drivers/iio/adc/at91-sama5d2_adc.c b/drivers/iio/adc/at91-sama5d2_adc.c
index a5c7771227d5..f2a74c47c768 100644
--- a/drivers/iio/adc/at91-sama5d2_adc.c
+++ b/drivers/iio/adc/at91-sama5d2_adc.c
@@ -873,18 +873,24 @@ static int at91_adc_dma_start(struct iio_dev *indio_dev)
 	return 0;
 }
 
+static bool at91_adc_current_chan_is_touch(struct iio_dev *indio_dev)
+{
+	struct at91_adc_state *st = iio_priv(indio_dev);
+
+	return !!bitmap_subset(indio_dev->active_scan_mask,
+			       &st->touch_st.channels_bitmask,
+			       AT91_SAMA5D2_MAX_CHAN_IDX + 1);
+}
+
 static int at91_adc_buffer_postenable(struct iio_dev *indio_dev)
 {
 	int ret;
 	struct at91_adc_state *st = iio_priv(indio_dev);
 
 	/* check if we are enabling triggered buffer or the touchscreen */
-	if (bitmap_subset(indio_dev->active_scan_mask,
-			  &st->touch_st.channels_bitmask,
-			  AT91_SAMA5D2_MAX_CHAN_IDX + 1)) {
-		/* touchscreen enabling */
+	if (at91_adc_current_chan_is_touch(indio_dev))
 		return at91_adc_configure_touch(st, true);
-	}
+
 	/* if we are not in triggered mode, we cannot enable the buffer. */
 	if (!(indio_dev->currentmode & INDIO_ALL_TRIGGERED_MODES))
 		return -EINVAL;
@@ -906,12 +912,9 @@ static int at91_adc_buffer_predisable(struct iio_dev *indio_dev)
 	u8 bit;
 
 	/* check if we are disabling triggered buffer or the touchscreen */
-	if (bitmap_subset(indio_dev->active_scan_mask,
-			  &st->touch_st.channels_bitmask,
-			  AT91_SAMA5D2_MAX_CHAN_IDX + 1)) {
-		/* touchscreen disable */
+	if (at91_adc_current_chan_is_touch(indio_dev))
 		return at91_adc_configure_touch(st, false);
-	}
+
 	/* if we are not in triggered mode, nothing to do here */
 	if (!(indio_dev->currentmode & INDIO_ALL_TRIGGERED_MODES))
 		return -EINVAL;
@@ -1886,14 +1889,10 @@ static __maybe_unused int at91_adc_resume(struct device *dev)
 		return 0;
 
 	/* check if we are enabling triggered buffer or the touchscreen */
-	if (bitmap_subset(indio_dev->active_scan_mask,
-			  &st->touch_st.channels_bitmask,
-			  AT91_SAMA5D2_MAX_CHAN_IDX + 1)) {
-		/* touchscreen enabling */
+	if (at91_adc_current_chan_is_touch(indio_dev))
 		return at91_adc_configure_touch(st, true);
-	} else {
+	else
 		return at91_adc_configure_trigger(st->trig, true);
-	}
 
 	/* not needed but more explicit */
 	return 0;
-- 
2.20.1