Re: Back porting bmg160 driver to 3.10.9 kernel

[Lars-Peter Clausen <lars@metafoo.de>]

On 05/22/2015 08:31 PM, Oliver King-Smith wrote:
> I am trying to back port the bmg160 driver to the 3.10.9 kernel to work on an Android 4.4.x device.
>
> The API for in ii_info has changed quite a bit between the 3.18 and the 3.10 kernel.  So this function won’t compile
>
> static int bmg160_read_event(struct iio_dev *indio_dev,
>                               const struct iio_chan_spec *chan,
>                               enum iio_event_type type,
>                               enum iio_event_direction dir,
>                               enum iio_event_info info,
>                               int *val, int *val2)
> {
>          struct bmg160_data *data = iio_priv(indio_dev);
>
>          *val2 = 0;
>          switch (info) {
>          case IIO_EV_INFO_VALUE:
>                  *val = data->slope_thres & BMG160_SLOPE_THRES_MASK;
>                  break;
>          default:
>                  return -EINVAL;
>          }
>
>          return IIO_VAL_INT;
> }
>
> The 3.10 prototype for this function is
>          int (*read_event_value)(struct iio_dev *indio_dev,
>                                  u64 event_code,
>                                  int *val);
>
> My question is what does IIO_EV_INFO_VALUE map to in the old event_code in the 3.10.9 kernel

Nothing. With the old API events could only have values and no other attributes.

- Lars