iio: accel: kxsd9: Support reading a mounting matrix

This adds support for the mounting matrix to the KXSD9 driver.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

1 files changed, 24 insertions, 0 deletions

diff --git a/drivers/iio/accel/kxsd9.c b/drivers/iio/accel/kxsd9.c
index a28163b76e12..9af60ac70738 100644
--- a/drivers/iio/accel/kxsd9.c
+++ b/drivers/iio/accel/kxsd9.c
@@ -68,12 +68,14 @@
  * struct kxsd9_state - device related storage
  * @dev: pointer to the parent device
  * @map: regmap to the device
+ * @orientation: mounting matrix, flipped axis etc
  * @regs: regulators for this device, VDD and IOVDD
  * @scale: the current scaling setting
  */
 struct kxsd9_state {
         struct device *dev;
         struct regmap *map;
+        struct iio_mount_matrix orientation;
         struct regulator_bulk_data regs[2];
         u8 scale;
 };
@@ -258,6 +260,20 @@ static const struct iio_buffer_setup_ops kxsd9_buffer_setup_ops = {
         .postdisable = kxsd9_buffer_postdisable,
 };
 
+static const struct iio_mount_matrix *
+kxsd9_get_mount_matrix(const struct iio_dev *indio_dev,
+                       const struct iio_chan_spec *chan)
+{
+        struct kxsd9_state *st = iio_priv(indio_dev);
+
+        return &st->orientation;
+}
+
+static const struct iio_chan_spec_ext_info kxsd9_ext_info[] = {
+        IIO_MOUNT_MATRIX(IIO_SHARED_BY_TYPE, kxsd9_get_mount_matrix),
+        { },
+};
+
 #define KXSD9_ACCEL_CHAN(axis, index)                                           \
         {                                                               \
                 .type = IIO_ACCEL,                                      \
@@ -266,6 +282,7 @@ static const struct iio_buffer_setup_ops kxsd9_buffer_setup_ops = {
                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),           \
                 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) |  \
                                         BIT(IIO_CHAN_INFO_OFFSET),      \
+                .ext_info = kxsd9_ext_info,                             \
                 .address = KXSD9_REG_##axis,                            \
                 .scan_index = index,                                    \
                 .scan_type = {                                          \
@@ -403,6 +420,13 @@ int kxsd9_common_probe(struct device *dev,
         indio_dev->modes = INDIO_DIRECT_MODE;
         indio_dev->available_scan_masks = kxsd9_scan_masks;
 
+        /* Read the mounting matrix, if present */
+        ret = of_iio_read_mount_matrix(dev,
+                                       "mount-matrix",
+                                       &st->orientation);
+        if (ret)
+                return ret;
+
         /* Fetch and turn on regulators */
         st->regs[0].supply = kxsd9_reg_vdd;
         st->regs[1].supply = kxsd9_reg_iovdd;