[PATCH v2 06/10] iio: gyro: itg3200: add mount matrix support

H. Nikolaus Schaller
2019-02-21T17:03:41Z

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/gyro/itg3200_core.c | 20 ++++++++++++++++++++
include/linux/iio/gyro/itg3200.h | 1 +
2 files changed, 21 insertions(+)

diff --git a/drivers/iio/gyro/itg3200_core.c b/drivers/iio/gyro/itg3200_core.c
index 7adecb562c81..203a6be33b70 100644
--- a/drivers/iio/gyro/itg3200_core.c
+++ b/drivers/iio/gyro/itg3200_core.c
@@ -242,6 +242,20 @@ static int itg3200_initial_setup(struct iio_dev *indio_dev)
return ret;
}

+static const struct iio_mount_matrix *
+itg3200_get_mount_matrix(const struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan)
+{
+ struct itg3200 *data = iio_priv(indio_dev);
+
+ return &data->orientation;
+}
+
+static const struct iio_chan_spec_ext_info itg3200_ext_info[] = {
+ IIO_MOUNT_MATRIX(IIO_SHARED_BY_DIR, itg3200_get_mount_matrix),
+ { }
+};
+
#define ITG3200_ST \
{ .sign = 's', .realbits = 16, .storagebits = 16, .endianness = IIO_BE }

@@ -255,6 +269,7 @@ static int itg3200_initial_setup(struct iio_dev *indio_dev)
.address = ITG3200_REG_GYRO_ ## _mod ## OUT_H, \
.scan_index = ITG3200_SCAN_GYRO_ ## _mod, \
.scan_type = ITG3200_ST, \
+ .ext_info = itg3200_ext_info, \
}

static const struct iio_chan_spec itg3200_channels[] = {
@@ -297,6 +312,11 @@ static int itg3200_probe(struct i2c_client *client,

st = iio_priv(indio_dev);

+ ret = iio_read_mount_matrix(&client->dev, "mount-matrix",
+ &st->orientation);
+ if (ret)
+ return ret;
+
i2c_set_clientdata(client, indio_dev);
st->i2c = client;

diff --git a/include/linux/iio/gyro/itg3200.h b/include/linux/iio/gyro/itg3200.h
index 2a820850f284..0a30fddccfb3 100644
--- a/include/linux/iio/gyro/itg3200.h
+++ b/include/linux/iio/gyro/itg3200.h
@@ -104,6 +104,7 @@
struct itg3200 {
struct i2c_client *i2c;
struct iio_trigger *trig;
+ struct iio_mount_matrix orientation;
};

enum ITG3200_SCAN_INDEX {
--
2.19.1