On Wed, 20 Feb 2019 15:00:56 +0100
"H. Nikolaus Schaller" <hns@xxxxxxxxxxxxx> wrote:
> 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@xxxxxxxxxxxxx>
The rest of these are all fine, though I suggest considering
a local variable rather than the fiddly bit of casting.
Jonathan
> ---
> drivers/iio/magnetometer/hmc5843.h | 1 +
> drivers/iio/magnetometer/hmc5843_core.c | 14 ++++++++++++++
> 2 files changed, 15 insertions(+)
>
> 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..e6b6da70c152 100644
> --- a/drivers/iio/magnetometer/hmc5843_core.c
> +++ b/drivers/iio/magnetometer/hmc5843_core.c
> @@ -237,6 +237,13 @@ 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)
> +{
> + return &((struct hmc5843_data *)iio_priv(indio_dev))->orientation;
> +}
> +
> static const struct iio_enum hmc5843_meas_conf_enum = {
> .items = hmc5843_meas_conf_modes,
> .num_items = ARRAY_SIZE(hmc5843_meas_conf_modes),
> @@ -247,6 +254,7 @@ 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),
> { },
> };
>
> @@ -260,6 +268,7 @@ 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),
> { },
> };
>
> @@ -635,6 +644,11 @@ int hmc5843_common_probe(struct device *dev, struct regmap *regmap,
> data->variant = &hmc5843_chip_info_tbl[id];
> mutex_init(&data->lock);
>
> + ret = of_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;
