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    Subject[PATCH 3.13.y-ckt 22/53] iio: inv-mpu: Specify the expected format/precision for write channels
    Date
    3.13.11-ckt25 -stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Adriana Reus <adriana.reus@intel.com>

    commit 6a3c45bb5a385be7049a7725a4fe93eaa76915f4 upstream.

    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>
    Signed-off-by: Jonathan Cameron <jic23@kernel.org>
    Signed-off-by: Kamal Mostafa <kamal@canonical.com>
    ---
    drivers/iio/imu/inv_mpu6050/inv_mpu_core.c | 19 +++++++++++++++++++
    1 file changed, 19 insertions(+)

    diff --git a/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c b/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c
    index 27a9176..12217fa 100644
    --- a/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c
    +++ b/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c
    @@ -322,6 +322,24 @@ error_read_raw:
    }
    }

    +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_fsr(struct inv_mpu6050_state *st, int fsr)
    {
    int result;
    @@ -604,6 +622,7 @@ 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,
    };
    --
    1.9.1


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