linux-kernel - [PATCH v3 07/14] iio: adc: max1027: Simplify the _set_trigger

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Date:   Wed, 15 Sep 2021 17:51:10 +0200
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     Jonathan Cameron <jic23@...nel.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Nuno Sa <Nuno.Sa@...log.com>,
        Miquel Raynal <miquel.raynal@...tlin.com>
Subject: [PATCH v3 07/14] iio: adc: max1027: Simplify the _set_trigger_state() helper

The call to max1027_enable_trigger() is the same in both cases thanks to
the 'state' variable, so factorize a little bit to simplify the code and
explain why we call this helper.

Signed-off-by: Miquel Raynal <miquel.raynal@...tlin.com>
---
 drivers/iio/adc/max1027.c | 19 ++++++++++---------
 1 file changed, 10 insertions(+), 9 deletions(-)

diff --git a/drivers/iio/adc/max1027.c b/drivers/iio/adc/max1027.c
index d1a9ffa68c38..b7cc77c2c01d 100644
--- a/drivers/iio/adc/max1027.c
+++ b/drivers/iio/adc/max1027.c
@@ -409,11 +409,17 @@ static int max1027_set_cnvst_trigger_state(struct iio_trigger *trig, bool state)
 	struct max1027_state *st = iio_priv(indio_dev);
 	int ret;
 
+	/*
+	 * In order to disable the convst trigger, start acquisition on
+	 * conversion register write, which basically disables triggering
+	 * conversions upon cnvst changes and thus has the effect of disabling
+	 * the external hardware trigger.
+	 */
+	ret = max1027_enable_trigger(indio_dev, state);
+	if (ret)
+		return ret;
+
 	if (state) {
-		ret = max1027_enable_trigger(indio_dev, state);
-		if (ret)
-			return ret;
-
 		/*
 		 * Scan from chan 0 to the highest requested channel.
 		 * Include temperature on demand.
@@ -426,11 +432,6 @@ static int max1027_set_cnvst_trigger_state(struct iio_trigger *trig, bool state)
 		ret = spi_write(st->spi, &st->reg, 1);
 		if (ret < 0)
 			return ret;
-	} else {
-		/* Start acquisition on conversion register write */
-		ret = max1027_enable_trigger(indio_dev, state);
-		if (ret)
-			return ret;
 	}
 
 	return 0;
-- 
2.27.0