linux-kernel - [PATCH v1 05/12] iio: accel: adxl313: add function to enable measurement

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Message-Id: <20250518111321.75226-6-l.rubusch@gmail.com>
Date: Sun, 18 May 2025 11:13:14 +0000
From: Lothar Rubusch <l.rubusch@...il.com>
To: jic23@...nel.org,
	dlechner@...libre.com,
	nuno.sa@...log.com,
	andy@...nel.org,
	corbet@....net,
	lucas.p.stankus@...il.com,
	lars@...afoo.de,
	Michael.Hennerich@...log.com
Cc: linux-iio@...r.kernel.org,
	linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Lothar Rubusch <l.rubusch@...il.com>
Subject: [PATCH v1 05/12] iio: accel: adxl313: add function to enable measurement

Add a function to enable measurement. The data-sheet recomments turning of
measurement while modifying certain config registers. This is a preparatory
step.

Signed-off-by: Lothar Rubusch <l.rubusch@...il.com>
---
 drivers/iio/accel/adxl313.h      |  3 ++-
 drivers/iio/accel/adxl313_core.c | 12 +++++++++---
 2 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/drivers/iio/accel/adxl313.h b/drivers/iio/accel/adxl313.h
index fc937bdf83b6..ba5b5d53a0ea 100644
--- a/drivers/iio/accel/adxl313.h
+++ b/drivers/iio/accel/adxl313.h
@@ -36,8 +36,9 @@
 #define ADXL313_RATE_MSK		GENMASK(3, 0)
 #define ADXL313_RATE_BASE		6
 
-#define ADXL313_POWER_CTL_MSK		GENMASK(3, 2)
+#define ADXL313_POWER_CTL_MSK		BIT(3)
 #define ADXL313_MEASUREMENT_MODE	BIT(3)
+#define ADXL313_MEASUREMENT_STANDBY	0x00
 
 #define ADXL313_RANGE_MSK		GENMASK(1, 0)
 #define ADXL313_RANGE_MAX		3
diff --git a/drivers/iio/accel/adxl313_core.c b/drivers/iio/accel/adxl313_core.c
index 6e0c5704e333..244fb2ec0b79 100644
--- a/drivers/iio/accel/adxl313_core.c
+++ b/drivers/iio/accel/adxl313_core.c
@@ -63,6 +63,14 @@ bool adxl313_is_volatile_reg(struct device *dev, unsigned int reg)
 }
 EXPORT_SYMBOL_NS_GPL(adxl313_is_volatile_reg, "IIO_ADXL313");
 
+static int adxl313_set_measure_en(struct adxl313_data *data, bool en)
+{
+	unsigned int val = en ? ADXL313_MEASUREMENT_MODE : ADXL313_MEASUREMENT_STANDBY;
+
+	return regmap_update_bits(data->regmap, ADXL313_REG_POWER_CTL,
+				  ADXL313_POWER_CTL_MSK, val);
+}
+
 static int adxl312_check_id(struct device *dev,
 			    struct adxl313_data *data)
 {
@@ -410,9 +418,7 @@ static int adxl313_setup(struct device *dev, struct adxl313_data *data,
 	}
 
 	/* Enables measurement mode */
-	return regmap_update_bits(data->regmap, ADXL313_REG_POWER_CTL,
-				  ADXL313_POWER_CTL_MSK,
-				  ADXL313_MEASUREMENT_MODE);
+	return adxl313_set_measure_en(data, true);
 }
 
 /**
-- 
2.39.5