[PATCH v2 03/10] iio: accel: bmc150: add mount matrix support

H. Nikolaus Schaller
2019-02-21T17:03:50Z

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/accel/bmc150-accel-core.c | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)

diff --git a/drivers/iio/accel/bmc150-accel-core.c b/drivers/iio/accel/bmc150-accel-core.c
index 383c802eb5b8..b4e2d9b04e1d 100644
--- a/drivers/iio/accel/bmc150-accel-core.c
+++ b/drivers/iio/accel/bmc150-accel-core.c
@@ -204,6 +204,7 @@ struct bmc150_accel_data {
int ev_enable_state;
int64_t timestamp, old_timestamp; /* Only used in hw fifo mode. */
const struct bmc150_accel_chip_info *chip_info;
+ struct iio_mount_matrix orientation;
};

static const struct {
@@ -796,6 +797,20 @@ static ssize_t bmc150_accel_get_fifo_state(struct device *dev,
return sprintf(buf, "%d\n", state);
}

+static const struct iio_mount_matrix *
+bmc150_accel_get_mount_matrix(const struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan)
+{
+ struct bmc150_accel_data *data = iio_priv(indio_dev);
+
+ return &data->orientation;
+}
+
+static const struct iio_chan_spec_ext_info bmc150_accel_ext_info[] = {
+ IIO_MOUNT_MATRIX(IIO_SHARED_BY_DIR, bmc150_accel_get_mount_matrix),
+ { }
+};
+
static IIO_CONST_ATTR(hwfifo_watermark_min, "1");
static IIO_CONST_ATTR(hwfifo_watermark_max,
__stringify(BMC150_ACCEL_FIFO_LENGTH));
@@ -978,6 +993,7 @@ static const struct iio_event_spec bmc150_accel_event = {
.shift = 16 - (bits), \
.endianness = IIO_LE, \
}, \
+ .ext_info = bmc150_accel_ext_info, \
.event_spec = &bmc150_accel_event, \
.num_event_specs = 1 \
}
@@ -1555,6 +1571,11 @@ int bmc150_accel_core_probe(struct device *dev, struct regmap *regmap, int irq,

data->regmap = regmap;

+ ret = iio_read_mount_matrix(dev, "mount-matrix",
+ &data->orientation);
+ if (ret)
+ return ret;
+
ret = bmc150_accel_chip_init(data);
if (ret < 0)
return ret;
--
2.19.1