iio: inv-mpu: Specify the expected format/precision for write channels

The gyroscope needs IIO_VAL_INT_PLUS_NANO for the scale channel and
unless specified write returns MICRO by default.
This needs to be properly specified so that write operations into scale
have the expected behaviour.

Signed-off-by: Adriana Reus <adriana.reus@intel.com>
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

diff --git a/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c b/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c
index 17d4bb15be4d2998681f203b5944c5c82ce606ea..65ce86837177158aba7e4d5fd2064e0731129369 100644 (file)
--- a/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c
+++ b/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c
@@ -431,6 +431,23 @@ static int inv_mpu6050_write_gyro_scale(struct inv_mpu6050_state *st, int val)
        return -EINVAL;
 }
 
+static int inv_write_raw_get_fmt(struct iio_dev *indio_dev,
+                                struct iio_chan_spec const *chan, long mask)
+{
+       switch (mask) {
+       case IIO_CHAN_INFO_SCALE:
+               switch (chan->type) {
+               case IIO_ANGL_VEL:
+                       return IIO_VAL_INT_PLUS_NANO;
+               default:
+                       return IIO_VAL_INT_PLUS_MICRO;
+               }
+       default:
+               return IIO_VAL_INT_PLUS_MICRO;
+       }
+
+       return -EINVAL;
+}
 static int inv_mpu6050_write_accel_scale(struct inv_mpu6050_state *st, int val)
 {
        int result, i;
@@ -696,6 +713,7 @@ static const struct iio_info mpu_info = {
        .driver_module = THIS_MODULE,
        .read_raw = &inv_mpu6050_read_raw,
        .write_raw = &inv_mpu6050_write_raw,
+       .write_raw_get_fmt = &inv_write_raw_get_fmt,
        .attrs = &inv_attribute_group,
        .validate_trigger = inv_mpu6050_validate_trigger,
 };