1. 13 Nov, 2016 2 commits
    • Peter Rosin's avatar
      iio: inkern: add helpers to query available values from channels · 00c5f80c
      Peter Rosin authored
      Specifically a helper for reading the available maximum raw value of a
      channel and a helper for forwarding read_avail requests for raw values
      from one iio driver to an iio channel that is consumed.
      
      These rather specific helpers are in turn built with generic helpers
      making it easy to build more helpers for available values as needed.
      Signed-off-by: default avatarPeter Rosin <peda@axentia.se>
      Signed-off-by: default avatarJonathan Cameron <jic23@kernel.org>
      00c5f80c
    • Jonathan Cameron's avatar
      iio:core: add a callback to allow drivers to provide _available attributes · 51239600
      Jonathan Cameron authored
      A large number of attributes can only take a limited range of values.
      Currently in IIO this is handled by directly registering additional
      *_available attributes thus providing this information to userspace.
      
      It is desirable to provide this information via the core for much the same
      reason this was done for the actual channel information attributes in the
      first place.  If it isn't there, then it can only really be accessed from
      userspace.  Other in kernel IIO consumers have no access to what valid
      parameters are.
      
      Two forms are currently supported:
      * list of values in one particular IIO_VAL_* format.
      	e.g. 1.300000 1.500000 1.730000
      * range specification with a step size:
      	e.g. [1.000000 0.500000 2.500000]
      	equivalent to 1.000000 1.5000000 2.000000 2.500000
      
      An addition set of masks are used to allow different sharing rules for the
      *_available attributes generated.
      
      This allows for example:
      
      in_accel_x_offset
      in_accel_y_offset
      in_accel_offset_available.
      
      We could have gone with having a specification for each and every
      info_mask element but that would have meant changing the existing userspace
      ABI.  This approach does not.
      Signed-off-by: default avatarJonathan Cameron <jic23@kernel.org>
      [forward ported, added some docs and fixed buffer overflows /peda]
      Acked-by: default avatarDaniel Baluta <daniel.baluta@intel.com>
      Signed-off-by: default avatarPeter Rosin <peda@axentia.se>
      Signed-off-by: default avatarJonathan Cameron <jic23@kernel.org>
      51239600
  2. 12 Nov, 2016 8 commits
  3. 08 Nov, 2016 4 commits
  4. 07 Nov, 2016 26 commits