linux-kernel - [PATCH v2 1/9] iio: imu: st_lsm6dsx: fix iio_chan

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Message-Id: <20251120082615.3263892-2-flavra@baylibre.com>
Date: Thu, 20 Nov 2025 09:26:07 +0100
From: Francesco Lavra <flavra@...libre.com>
To: Lorenzo Bianconi <lorenzo@...nel.org>,
	Jonathan Cameron <jic23@...nel.org>,
	David Lechner <dlechner@...libre.com>,
	Nuno Sá <nuno.sa@...log.com>,
	Andy Shevchenko <andy@...nel.org>,
	linux-iio@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 1/9] iio: imu: st_lsm6dsx: fix iio_chan_spec for sensors without event detection

The st_lsm6dsx_acc_channels array of struct iio_chan_spec has a non-NULL
event_spec field, indicating support for IIO events. However, event
detection is not supported for all sensors, and if userspace tries to
configure accelerometer wakeup events on a sensor device that does not
support them (e.g. LSM6DS0), st_lsm6dsx_write_event() dereferences a NULL
pointer when trying to write to the wakeup register.
Define an additional struct iio_chan_spec array whose members have a NULL
event_spec field, and use this array instead of st_lsm6dsx_acc_channels for
sensors without event detection capability.

Fixes: b5969abfa8b8 ("iio: imu: st_lsm6dsx: add motion events")
Signed-off-by: Francesco Lavra <flavra@...libre.com>
---
 drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c
index 216160549b5a..a09df9d772dd 100644
--- a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c
+++ b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c
@@ -103,6 +103,13 @@ static const struct iio_chan_spec st_lsm6dsx_acc_channels[] = {
 	IIO_CHAN_SOFT_TIMESTAMP(3),
 };
 
+static const struct iio_chan_spec st_lsm6ds0_acc_channels[] = {
+	ST_LSM6DSX_CHANNEL(IIO_ACCEL, 0x28, IIO_MOD_X, 0),
+	ST_LSM6DSX_CHANNEL(IIO_ACCEL, 0x2a, IIO_MOD_Y, 1),
+	ST_LSM6DSX_CHANNEL(IIO_ACCEL, 0x2c, IIO_MOD_Z, 2),
+	IIO_CHAN_SOFT_TIMESTAMP(3),
+};
+
 static const struct iio_chan_spec st_lsm6dsx_gyro_channels[] = {
 	ST_LSM6DSX_CHANNEL(IIO_ANGL_VEL, 0x22, IIO_MOD_X, 0),
 	ST_LSM6DSX_CHANNEL(IIO_ANGL_VEL, 0x24, IIO_MOD_Y, 1),
@@ -144,8 +151,8 @@ static const struct st_lsm6dsx_settings st_lsm6dsx_sensor_settings[] = {
 		},
 		.channels = {
 			[ST_LSM6DSX_ID_ACC] = {
-				.chan = st_lsm6dsx_acc_channels,
-				.len = ARRAY_SIZE(st_lsm6dsx_acc_channels),
+				.chan = st_lsm6ds0_acc_channels,
+				.len = ARRAY_SIZE(st_lsm6ds0_acc_channels),
 			},
 			[ST_LSM6DSX_ID_GYRO] = {
 				.chan = st_lsm6ds0_gyro_channels,
@@ -1445,8 +1452,8 @@ static const struct st_lsm6dsx_settings st_lsm6dsx_sensor_settings[] = {
 		},
 		.channels = {
 			[ST_LSM6DSX_ID_ACC] = {
-				.chan = st_lsm6dsx_acc_channels,
-				.len = ARRAY_SIZE(st_lsm6dsx_acc_channels),
+				.chan = st_lsm6ds0_acc_channels,
+				.len = ARRAY_SIZE(st_lsm6ds0_acc_channels),
 			},
 			[ST_LSM6DSX_ID_GYRO] = {
 				.chan = st_lsm6dsx_gyro_channels,
-- 
2.39.5