[PATCH v2 08/10] iio: magnetometer: hmc5843: add mount matrix support

H. Nikolaus Schaller
2019-02-21T17:03:26Z

This patch allows to read a mount-matrix device tree
property and report to user-space or in-kernel iio
clients.

Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
---
drivers/iio/magnetometer/hmc5843.h | 1 +
drivers/iio/magnetometer/hmc5843_core.c | 20 ++++++++++++++++++--
2 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/drivers/iio/magnetometer/hmc5843.h b/drivers/iio/magnetometer/hmc5843.h
index a75224cf99df..e3e22d2508d3 100644
--- a/drivers/iio/magnetometer/hmc5843.h
+++ b/drivers/iio/magnetometer/hmc5843.h
@@ -43,6 +43,7 @@ struct hmc5843_data {
struct mutex lock;
struct regmap *regmap;
const struct hmc5843_chip_info *variant;
+ struct iio_mount_matrix orientation;
__be16 buffer[8];
};

diff --git a/drivers/iio/magnetometer/hmc5843_core.c b/drivers/iio/magnetometer/hmc5843_core.c
index ada142fb7aa3..05629ec56d80 100644
--- a/drivers/iio/magnetometer/hmc5843_core.c
+++ b/drivers/iio/magnetometer/hmc5843_core.c
@@ -237,6 +237,15 @@ int hmc5843_set_measurement_configuration(struct iio_dev *indio_dev,
return hmc5843_set_meas_conf(data, meas_conf);
}

+static const struct iio_mount_matrix *
+hmc5843_get_mount_matrix(const struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan)
+{
+ struct hmc5843_data *data = iio_priv(indio_dev);
+
+ return &data->orientation;
+}
+
static const struct iio_enum hmc5843_meas_conf_enum = {
.items = hmc5843_meas_conf_modes,
.num_items = ARRAY_SIZE(hmc5843_meas_conf_modes),
@@ -247,7 +256,8 @@ static const struct iio_enum hmc5843_meas_conf_enum = {
static const struct iio_chan_spec_ext_info hmc5843_ext_info[] = {
IIO_ENUM("meas_conf", true, &hmc5843_meas_conf_enum),
IIO_ENUM_AVAILABLE("meas_conf", &hmc5843_meas_conf_enum),
- { },
+ IIO_MOUNT_MATRIX(IIO_SHARED_BY_DIR, hmc5843_get_mount_matrix),
+ { }
};

static const struct iio_enum hmc5983_meas_conf_enum = {
@@ -260,7 +270,8 @@ static const struct iio_enum hmc5983_meas_conf_enum = {
static const struct iio_chan_spec_ext_info hmc5983_ext_info[] = {
IIO_ENUM("meas_conf", true, &hmc5983_meas_conf_enum),
IIO_ENUM_AVAILABLE("meas_conf", &hmc5983_meas_conf_enum),
- { },
+ IIO_MOUNT_MATRIX(IIO_SHARED_BY_DIR, hmc5843_get_mount_matrix),
+ { }
};

static
@@ -635,6 +646,11 @@ int hmc5843_common_probe(struct device *dev, struct regmap *regmap,
data->variant = &hmc5843_chip_info_tbl[id];
mutex_init(&data->lock);

+ ret = iio_read_mount_matrix(dev, "mount-matrix",
+ &data->orientation);
+ if (ret)
+ return ret;
+
indio_dev->dev.parent = dev;
indio_dev->name = name;
indio_dev->info = &hmc5843_info;
--
2.19.1