linux-kernel - [PATCH v4 02/11] iio: accel: adxl313: introduce channel buffer

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Message-Id: <20250601172139.59156-3-l.rubusch@gmail.com>
Date: Sun,  1 Jun 2025 17:21:30 +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,
	bagasdotme@...il.com
Cc: l.rubusch@...il.com,
	linux-iio@...r.kernel.org,
	linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v4 02/11] iio: accel: adxl313: introduce channel buffer

Add a scan_mask and scan_index to the iio channel. The scan_index
prepares the buffer usage. According to the datasheet, the ADXL313
uses 13 bit in full resolution. Add signedness, storage bits and
endianness.

Signed-off-by: Lothar Rubusch <l.rubusch@...il.com>
---
 drivers/iio/accel/adxl313_core.c | 24 +++++++++++++++++++-----
 1 file changed, 19 insertions(+), 5 deletions(-)

diff --git a/drivers/iio/accel/adxl313_core.c b/drivers/iio/accel/adxl313_core.c
index 2f26da5857d4..06a771bb4726 100644
--- a/drivers/iio/accel/adxl313_core.c
+++ b/drivers/iio/accel/adxl313_core.c
@@ -171,9 +171,10 @@ static const int adxl313_odr_freqs[][2] = {
 	[9] = { 3200, 0 },
 };
 
-#define ADXL313_ACCEL_CHANNEL(index, axis) {				\
+#define ADXL313_ACCEL_CHANNEL(index, reg, axis) {			\
 	.type = IIO_ACCEL,						\
-	.address = index,						\
+	.scan_index = (index),						\
+	.address = (reg),						\
 	.modified = 1,							\
 	.channel2 = IIO_MOD_##axis,					\
 	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |			\
@@ -183,14 +184,26 @@ static const int adxl313_odr_freqs[][2] = {
 	.info_mask_shared_by_type_available =				\
 		BIT(IIO_CHAN_INFO_SAMP_FREQ),				\
 	.scan_type = {							\
+		.sign = 's',						\
 		.realbits = 13,						\
+		.storagebits = 16,					\
+		.endianness = IIO_BE,					\
 	},								\
 }
 
+enum adxl313_chans {
+	chan_x, chan_y, chan_z,
+};
+
 static const struct iio_chan_spec adxl313_channels[] = {
-	ADXL313_ACCEL_CHANNEL(0, X),
-	ADXL313_ACCEL_CHANNEL(1, Y),
-	ADXL313_ACCEL_CHANNEL(2, Z),
+	ADXL313_ACCEL_CHANNEL(0, chan_x, X),
+	ADXL313_ACCEL_CHANNEL(1, chan_y, Y),
+	ADXL313_ACCEL_CHANNEL(2, chan_z, Z),
+};
+
+static const unsigned long adxl313_scan_masks[] = {
+	BIT(chan_x) | BIT(chan_y) | BIT(chan_z),
+	0
 };
 
 static int adxl313_set_odr(struct adxl313_data *data,
@@ -419,6 +432,7 @@ int adxl313_core_probe(struct device *dev,
 	indio_dev->modes = INDIO_DIRECT_MODE;
 	indio_dev->channels = adxl313_channels;
 	indio_dev->num_channels = ARRAY_SIZE(adxl313_channels);
+	indio_dev->available_scan_masks = adxl313_scan_masks;
 
 	ret = adxl313_setup(dev, data, setup);
 	if (ret) {
-- 
2.39.5