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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>,
	"Nuno Sá" <nuno.sa@analog.com>
Subject: [PATCH v4 06/16] iio: adc: max1027: Create a helper to enable/disable the cnvst trigger
Date: Tue, 21 Sep 2021 13:53:58 +0200	[thread overview]
Message-ID: <20210921115408.66711-7-miquel.raynal@bootlin.com> (raw)
In-Reply-To: <20210921115408.66711-1-miquel.raynal@bootlin.com>

There are two ways to physically trigger a conversion:
- A falling edge on the cnvst pin
- A write operation on the conversion register

Let's create a helper for this.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Reviewed-by: Nuno Sá <nuno.sa@analog.com>
---
 drivers/iio/adc/max1027.c | 41 ++++++++++++++++++++++++---------------
 1 file changed, 25 insertions(+), 16 deletions(-)

diff --git a/drivers/iio/adc/max1027.c b/drivers/iio/adc/max1027.c
index e84f49f21778..d1a9ffa68c38 100644
--- a/drivers/iio/adc/max1027.c
+++ b/drivers/iio/adc/max1027.c
@@ -271,6 +271,25 @@ struct max1027_state {
 	u8				reg ____cacheline_aligned;
 };
 
+static int max1027_enable_trigger(struct iio_dev *indio_dev, bool enable)
+{
+	struct max1027_state *st = iio_priv(indio_dev);
+
+	st->reg = MAX1027_SETUP_REG | MAX1027_REF_MODE2;
+
+	/*
+	 * Start acquisition on:
+	 * MODE0: external hardware trigger wired to the cnvst input pin
+	 * MODE2: conversion register write
+	 */
+	if (enable)
+		st->reg |= MAX1027_CKS_MODE0;
+	else
+		st->reg |= MAX1027_CKS_MODE2;
+
+	return spi_write(st->spi, &st->reg, 1);
+}
+
 static int max1027_read_single_value(struct iio_dev *indio_dev,
 				     struct iio_chan_spec const *chan,
 				     int *val)
@@ -283,14 +302,9 @@ static int max1027_read_single_value(struct iio_dev *indio_dev,
 		return -EBUSY;
 	}
 
-	/* Start acquisition on conversion register write */
-	st->reg = MAX1027_SETUP_REG | MAX1027_REF_MODE2 | MAX1027_CKS_MODE2;
-	ret = spi_write(st->spi, &st->reg, 1);
-	if (ret < 0) {
-		dev_err(&indio_dev->dev,
-			"Failed to configure setup register\n");
+	ret = max1027_enable_trigger(indio_dev, false);
+	if (ret)
 		return ret;
-	}
 
 	/* Configure conversion register with the requested chan */
 	st->reg = MAX1027_CONV_REG | MAX1027_CHAN(chan->channel) |
@@ -396,11 +410,8 @@ static int max1027_set_cnvst_trigger_state(struct iio_trigger *trig, bool state)
 	int ret;
 
 	if (state) {
-		/* Start acquisition on cnvst */
-		st->reg = MAX1027_SETUP_REG | MAX1027_CKS_MODE0 |
-			  MAX1027_REF_MODE2;
-		ret = spi_write(st->spi, &st->reg, 1);
-		if (ret < 0)
+		ret = max1027_enable_trigger(indio_dev, state);
+		if (ret)
 			return ret;
 
 		/*
@@ -417,10 +428,8 @@ static int max1027_set_cnvst_trigger_state(struct iio_trigger *trig, bool state)
 			return ret;
 	} else {
 		/* Start acquisition on conversion register write */
-		st->reg = MAX1027_SETUP_REG | MAX1027_CKS_MODE2	|
-			  MAX1027_REF_MODE2;
-		ret = spi_write(st->spi, &st->reg, 1);
-		if (ret < 0)
+		ret = max1027_enable_trigger(indio_dev, state);
+		if (ret)
 			return ret;
 	}
 
-- 
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 ` Miquel Raynal [this message]
2021-09-21 11:53 ` [PATCH v4 07/16] iio: adc: max1027: Simplify the _set_trigger_state() helper Miquel Raynal
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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