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This change contains a basic charging loop that follows Chromium battery charging flow. The temperature range constants, loop delay time will be move to battery pack later. Signed-off-by: Rong Chang <rongchang@chromium.org> BUG=chrome-os-partner:9724,9757,9759 TEST=manual, uart console Plug AC adapter: > pmu event: 0000000000001110 [batt] state discharging -> idle [batt] state idle -> charging > battery I: 0x04fd = 1277 mA(CHG)a Unplug AC adapter: > pmu event: 0000000000000110 [batt] state charging -> idle [batt] state idle -> discharging > battery I: 0xffcb = -53 mA(DISCHG) Change-Id: Ifed594d78c0ed08c5e4821a9c8581c1a87526729 Reviewed-on: https://gerrit.chromium.org/gerrit/25618 Tested-by: Vincent Palatin <vpalatin@chromium.org> Reviewed-by: Simon Glass <sjg@chromium.org> Commit-Ready: Vincent Palatin <vpalatin@chromium.org>