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Subject[PATCH v2 07/10] iio: magnetometer: bmc150: add mount matrix support
Date
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/bmc150_magn.c | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)

diff --git a/drivers/iio/magnetometer/bmc150_magn.c b/drivers/iio/magnetometer/bmc150_magn.c
index d91cb845e3d6..b0d8b036d9bb 100644
--- a/drivers/iio/magnetometer/bmc150_magn.c
+++ b/drivers/iio/magnetometer/bmc150_magn.c
@@ -143,6 +143,7 @@ struct bmc150_magn_data {
*/
struct mutex mutex;
struct regmap *regmap;
+ struct iio_mount_matrix orientation;
/* 4 x 32 bits for x, y z, 4 bytes align, 64 bits timestamp */
s32 buffer[6];
struct iio_trigger *dready_trig;
@@ -612,6 +613,20 @@ static ssize_t bmc150_magn_show_samp_freq_avail(struct device *dev,
return len;
}

+static const struct iio_mount_matrix *
+bmc150_magn_get_mount_matrix(const struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan)
+{
+ struct bmc150_magn_data *data = iio_priv(indio_dev);
+
+ return &data->orientation;
+}
+
+static const struct iio_chan_spec_ext_info bmc150_magn_ext_info[] = {
+ IIO_MOUNT_MATRIX(IIO_SHARED_BY_DIR, bmc150_magn_get_mount_matrix),
+ { }
+};
+
static IIO_DEV_ATTR_SAMP_FREQ_AVAIL(bmc150_magn_show_samp_freq_avail);

static struct attribute *bmc150_magn_attributes[] = {
@@ -638,6 +653,7 @@ static const struct attribute_group bmc150_magn_attrs_group = {
.storagebits = 32, \
.endianness = IIO_LE \
}, \
+ .ext_info = bmc150_magn_ext_info, \
}

static const struct iio_chan_spec bmc150_magn_channels[] = {
@@ -861,6 +877,11 @@ int bmc150_magn_probe(struct device *dev, struct regmap *regmap,
data->irq = irq;
data->dev = dev;

+ ret = iio_read_mount_matrix(dev, "mount-matrix",
+ &data->orientation);
+ if (ret)
+ return ret;
+
if (!name && ACPI_HANDLE(dev))
name = bmc150_magn_match_acpi_device(dev);

--
2.19.1
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