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From: Miquel Raynal <miquel.raynal@bootlin.com>
To: Jonathan Cameron <jic23@kernel.org>,
	Lars-Peter Clausen <lars@metafoo.de>,
	linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>,
	Nuno Sa <Nuno.Sa@analog.com>,
	Miquel Raynal <miquel.raynal@bootlin.com>
Subject: [PATCH v4 07/16] iio: adc: max1027: Simplify the _set_trigger_state() helper
Date: Tue, 21 Sep 2021 13:53:59 +0200	[thread overview]
Message-ID: <20210921115408.66711-8-miquel.raynal@bootlin.com> (raw)
In-Reply-To: <20210921115408.66711-1-miquel.raynal@bootlin.com>

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@bootlin.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


  parent reply	other threads:[~2021-09-21 11:54 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-21 11:53 [PATCH v4 00/16] Bring external triggers support to MAX1027-like ADCs Miquel Raynal
2021-09-21 11:53 ` [PATCH v4 01/16] iio: adc: max1027: Fix style Miquel Raynal
2021-09-21 11:53 ` [PATCH v4 02/16] iio: adc: max1027: Drop extra warning message Miquel Raynal
2021-09-21 11:53 ` [PATCH v4 03/16] iio: adc: max1027: Drop useless debug messages Miquel Raynal
2021-09-21 11:53 ` [PATCH v4 04/16] iio: adc: max1027: Minimize the number of converted channels Miquel Raynal
2021-09-21 11:53 ` [PATCH v4 05/16] iio: adc: max1027: Rename a helper Miquel Raynal
2021-09-21 11:53 ` [PATCH v4 06/16] iio: adc: max1027: Create a helper to enable/disable the cnvst trigger Miquel Raynal
2021-09-21 11:53 ` Miquel Raynal [this message]
2021-09-21 11:54 ` [PATCH v4 08/16] iio: adc: max1027: Ensure a default cnvst trigger configuration Miquel Raynal
2021-09-21 11:54 ` [PATCH v4 09/16] iio: adc: max1027: Create a helper to configure the channels to scan Miquel Raynal
2021-09-21 11:54 ` [PATCH v4 10/16] iio: adc: max1027: Prevent single channel accesses during buffer reads Miquel Raynal
2021-09-21 11:54 ` [PATCH v4 11/16] iio: adc: max1027: Separate the IRQ handler from the read logic Miquel Raynal
2021-09-21 11:54 ` [PATCH v4 12/16] iio: adc: max1027: Introduce an end of conversion helper Miquel Raynal
2021-09-21 11:54 ` [PATCH v4 13/16] iio: adc: max1027: Stop requesting a threaded IRQ Miquel Raynal
2021-09-21 11:54 ` [PATCH v4 14/16] iio: adc: max1027: Use the EOC IRQ when populated for single reads Miquel Raynal
2021-09-26 14:36   ` Jonathan Cameron
2021-09-27 14:30     ` Miquel Raynal
2021-09-21 11:54 ` [PATCH v4 15/16] iio: adc: max1027: Allow all kind of triggers to be used Miquel Raynal
2021-09-21 11:54 ` [PATCH v4 16/16] iio: adc: max1027: Don't reject external triggers when there is no IRQ Miquel Raynal
2021-09-26 14:38 ` [PATCH v4 00/16] Bring external triggers support to MAX1027-like ADCs Jonathan Cameron

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