linear_range_get_win_index does not behave correctly when the
window of values is above the linear range. It reports
-ERANGE (partial intersection) instead of -EINVAL.
Extra conditions added for edge cases and tests cases updated.
Signed-off-by: Andy Sinclair <andy.sinclair@nordicsemi.no>
The existing linear_range API did not allow values or windows outside of
the linear range (returned -EINVAL). With this change values are allowed
outside of the range, being adjusted to the edge values (min/max)
instead. In the case of windows, it is allowed to have partial
intersection. In both cases, the API assigns a valid index (nearest) and
returns -ERANGE. This change is useful because the main client of the
linear range API, regulators, needs such behavior. For example, If an
application specifies a voltage range from 1.0V to 1.5V and the
regulator supports from 1.2V to 2.7V, the regulator can configure a
voltage that satisfies the condition: 1.2V. With the current API, the
input would be refused because 1.0V lies outside of the 1.2V-2.7V range.
Also, for constant ranges, the minimum index is returned.
Tests have been updated/extended accordingly.
Signed-off-by: Gerard Marull-Paretas <gerard.marull@nordicsemi.no>
Ranges with step 0, that is, multiple indices representing the same
value, need to report the count exclusively based on indices. This makes
it possible to later retrieve all values, e.g. in a group.
Signed-off-by: Gerard Marull-Paretas <gerard.marull@nordicsemi.no>
When dealing with groups, the specified window in
linear_range_group_get_win_index can span across multiple groups. In the
current implementation, if maximum value was not in the same sub-window
as the minimum value the function would return -EINVAL. This patch fixes
the problem and updates test cases to cover such scenario.
Signed-off-by: Gerard Marull-Paretas <gerard.marull@nordicsemi.no>
