On Wed, 20 Feb 2019 17:20:29 +0100
"H. Nikolaus Schaller" <hns@xxxxxxxxxxxxx> wrote:
> > Am 20.02.2019 um 17:14 schrieb Jonathan Cameron <jic23@xxxxxxxxxx>:
> >
> > On Wed, 20 Feb 2019 15:00:50 +0100
> > "H. Nikolaus Schaller" <hns@xxxxxxxxxxxxx> wrote:
> >
> >> 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@xxxxxxxxxxxxx>
> > This will clash with Andy's current patch, but I'll fix that up if
> > needed. Otherwise, one trivial suggestion inline.
>
> Ok, thanks!
>
> >
> > Jonathan
> >
> >> ---
> >> drivers/iio/accel/bmc150-accel-core.c | 19 +++++++++++++++++++
> >> 1 file changed, 19 insertions(+)
> >>
> >> diff --git a/drivers/iio/accel/bmc150-accel-core.c b/drivers/iio/accel/bmc150-accel-core.c
> >> index 383c802eb5b8..9178846cfddc 100644
> >> --- 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 +797,18 @@ 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)
> >> +{
> >> + return &((struct bmc150_accel_data *)iio_priv(indio_dev))->orientation;
> >
> > I would use a local variable as that casting is less than simple to parse
> > to my eyes anyway!
>
> Yes, Andy already suggested that. I just happend to pick one of the only two bad examples
> from all iio drivers as template...
>
> drivers/iio/imu/inv_mpu6050/inv_mpu_core.c
> drivers/iio/magnetometer/ak8975.c
If you like, feel free to send patches to tidy those up as well!
Then no one else can be unlucky on the same thing in future.
Jonathan
>
> >
> >> +}
> >> +
> >> +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 +991,7 @@ 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 +1569,11 @@ int bmc150_accel_core_probe(struct device *dev, struct regmap *regmap, int irq,
> >>
> >> data->regmap = regmap;
> >>
> >> + ret = of_iio_read_mount_matrix(dev, "mount-matrix",
> >> + &data->orientation);
> >> + if (ret)
> >> + return ret;
> >> +
> >> ret = bmc150_accel_chip_init(data);
> >> if (ret < 0)
> >> return ret;
> >
>
> BR and thanks,
> Nikolaus
>
