Nicolas Boichat abdb022a2b battery: Allow 2 batteries to be fetched via ACPI ...

We share the same shared memory fields for both batteries. When
the host wants to switch battery to read out:
 - The host sets EC_ACPI_MEM_BATTERY_INDEX to the required index
 - EC then swaps the data is the shared memory fields, then update
   EC_MEMMAP_BATT_INDEX
 - Host waits for EC_MEMMAP_BATT_INDEX to have the required value,
   then fetches the data

BRANCH=none
BUG=b:65697620
TEST=Boot lux, both /sys/class/power_supply/BAT0 and BAT1 are
     present, data is valid.
TEST=Unplug base, BAT1 goes away, replug, BAT1 comes back.

Change-Id: Icce12f9eef2f6f8cde9bae0a968a65e1703d0369
Signed-off-by: Nicolas Boichat <drinkcat@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/888382
Reviewed-by: Gwendal Grignou <gwendal@google.com>

2018-02-09 07:55:33 -08:00

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