iio: accel: bma180: 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/bma180.c b/drivers/iio/accel/bma180.c
index cb9765a3de60719788ae436ffaac9de09e7ba323..f9720a1e8a7c83811965d8d8695a7c23411c960e 100644 (file)
--- a/drivers/iio/accel/bma180.c
+++ b/drivers/iio/accel/bma180.c
@@ -116,6 +116,7 @@ struct bma180_data {
        struct i2c_client *client;
        struct iio_trigger *trig;
        const struct bma180_part_info *part_info;
+       struct iio_mount_matrix orientation;
        struct mutex mutex;
        bool sleep_state;
        int scale;
@@ -561,6 +562,15 @@ static int bma180_set_power_mode(struct iio_dev *indio_dev,
        return ret;
 }
 
+static const struct iio_mount_matrix *
+bma180_accel_get_mount_matrix(const struct iio_dev *indio_dev,
+                               const struct iio_chan_spec *chan)
+{
+       struct bma180_data *data = iio_priv(indio_dev);
+
+       return &data->orientation;
+}
+
 static const struct iio_enum bma180_power_mode_enum = {
        .items = bma180_power_modes,
        .num_items = ARRAY_SIZE(bma180_power_modes),
@@ -571,7 +581,8 @@ static const struct iio_enum bma180_power_mode_enum = {
 static const struct iio_chan_spec_ext_info bma180_ext_info[] = {
        IIO_ENUM("power_mode", true, &bma180_power_mode_enum),
        IIO_ENUM_AVAILABLE("power_mode", &bma180_power_mode_enum),
-       { },
+       IIO_MOUNT_MATRIX(IIO_SHARED_BY_DIR, bma180_accel_get_mount_matrix),
+       { }
 };
 
 #define BMA180_ACC_CHANNEL(_axis, _bits) {                             \
@@ -722,6 +733,11 @@ static int bma180_probe(struct i2c_client *client,
                chip = id->driver_data;
        data->part_info = &bma180_part_info[chip];
 
+       ret = iio_read_mount_matrix(&client->dev, "mount-matrix",
+                               &data->orientation);
+       if (ret)
+               return ret;
+
        ret = data->part_info->chip_config(data);
        if (ret < 0)
                goto err_chip_disable;