spring: Improve battery LED stability
Previously, we sometimes saw battery LED went off when going into or out
of battery assist mode. This CL adds a state machine to stabilize
battery LED. By controlling the state of lighting engine, the
tranisition from/to battery assist mode is seamless now.
BUG=chrome-os-partner:18844
TEST=On spring, check:
1. LED doesn't go off when going into battery assist mode.
2. LED doesn't suddenly change brightness when coming out of
battery assist mode.
3. LED goes red after few seconds when battery is not present.
4. LED goes green when battery is charged.
BRANCH=spring
Signed-off-by: Vic Yang <victoryang@chromium.org>
Change-Id: I3286b54a76edd77c65033ec3bbf0d81d916f7be0
Reviewed-on: https://gerrit.chromium.org/gerrit/48875
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
Commit-Queue: Vic Yang <victoryang@chromium.org>
Tested-by: Vic Yang <victoryang@chromium.org>
1 file changed
