iio: accel: bmc150: add mount matrix support

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>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/drivers/iio/accel/bmc150-accel-core.c b/drivers/iio/accel/bmc150-accel-core.c
index 383c802..b4e2d9b 100644 (file)
--- 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;