[PATCH] iio: imu: st_lsm6dsx: add mount matrix support

[Martin Kepplinger]

Allow to read the mount-matrix device tree property and provide the
mount_matrix file for userspace to read.

Signed-off-by: Martin Kepplinger <martin.kepplinger@xxxxxxx>
---

tested using the lsm9ds1 on the librem5-devkit (and userspace tools like
iio-sensor-proxy) where this will be needed.

thanks,

                               martin



 drivers/iio/imu/st_lsm6dsx/st_lsm6dsx.h      | 18 ++++++++++++++++++
 drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c |  4 ++++
 2 files changed, 22 insertions(+)

diff --git a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx.h b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx.h
index a763ff46f596..8483f770b233 100644
--- a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx.h
+++ b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx.h
@@ -76,6 +76,7 @@ enum st_lsm6dsx_hw_id {
 		.endianness = IIO_LE,					\
 	},								\
 	.event_spec = &st_lsm6dsx_event,				\
+	.ext_info = st_lsm6dsx_accel_ext_info,				\
 	.num_event_specs = 1,						\
 }
 
@@ -406,6 +407,8 @@ struct st_lsm6dsx_hw {
 	struct iio_dev *iio_devs[ST_LSM6DSX_ID_MAX];
 
 	const struct st_lsm6dsx_settings *settings;
+
+	struct iio_mount_matrix orientation;
 };
 
 static __maybe_unused const struct iio_event_spec st_lsm6dsx_event = {
@@ -479,4 +482,19 @@ st_lsm6dsx_write_locked(struct st_lsm6dsx_hw *hw, unsigned int addr,
 	return err;
 }
 
+static const struct iio_mount_matrix *
+st_lsm6dsx_get_mount_matrix(const struct iio_dev *iio_dev,
+			    const struct iio_chan_spec *chan)
+{
+	struct st_lsm6dsx_sensor *sensor = iio_priv(iio_dev);
+	struct st_lsm6dsx_hw *hw = sensor->hw;
+
+	return &hw->orientation;
+}
+
+static const struct iio_chan_spec_ext_info st_lsm6dsx_accel_ext_info[] = {
+	IIO_MOUNT_MATRIX(IIO_SHARED_BY_ALL, st_lsm6dsx_get_mount_matrix),
+	{ }
+};
+
 #endif /* ST_LSM6DSX_H */
diff --git a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c
index 0c64e35c7599..587e02bb9be9 100644
--- a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c
+++ b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c
@@ -2325,6 +2325,10 @@ int st_lsm6dsx_probe(struct device *dev, int irq, int hw_id,
 	    (pdata && pdata->wakeup_source))
 		device_init_wakeup(dev, true);
 
+	err = iio_read_mount_matrix(hw->dev, "mount-matrix", &hw->orientation);
+	if (err)
+		return err;
+
 	return 0;
 }
 EXPORT_SYMBOL(st_lsm6dsx_probe);
-- 
2.20.1