Kefka: Disable hibernate on G3 idle, cutoff battery on critical charge

Kefka currently hibernates when it's idel in G3 for 60 min. This behavior
makes Kefka drain a battery deeply over a long idle (3+ months). This
patch disable hibernation in G3.

Kefka currently hibernates when the battery reaches critical level (2%).
This patch sets the threshold to 5% and makes EC cutoff a battery
instead of hibernate.

Signed-off-by: Daisuke Nojiri <dnojiri@chromium.org>

BUG=b/124266129
BRANCH=strago
TEST=Make Kefka drain battery and verify it cuts off a battery when the
soc reaches 5%. Verify Kefka doesn't hibernate after G3 idle timer
exipres.

Change-Id: Ib8cc770c1de17a1a47abf71b0ab45e732e07b267
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/1515722
Reviewed-by: Daisuke Nojiri <dnojiri@chromium.org>
Commit-Queue: Daisuke Nojiri <dnojiri@chromium.org>
Tested-by: Daisuke Nojiri <dnojiri@chromium.org>

1 files changed, 24 insertions, 0 deletions

diff --git a/board/kefka/board.c b/board/kefka/board.c
index fc10a2caac..3a893392e6 100644
--- a/board/kefka/board.c
+++ b/board/kefka/board.c
@@ -280,3 +280,27 @@ static void get_motion_sensors_count(void)
 		motion_sensor_count = 0;
 }
 DECLARE_HOOK(HOOK_INIT, get_motion_sensors_count, HOOK_PRIO_FIRST);
+
+
+enum critical_shutdown board_critical_shutdown_check(
+		struct charge_state_data *curr)
+{
+		return CRITICAL_SHUTDOWN_CUTOFF;
+}
+
+uint8_t board_set_battery_level_shutdown(void)
+{
+	/* Cut off at 5% */
+	return 6;
+}
+
+enum critical_shutdown board_system_is_idle(uint64_t last_shutdown_time,
+					    uint64_t *target, uint64_t now)
+{
+	/*
+	 * Don't do anything. Battery eventually will reach critical
+	 * charge (5%). Then, board_critical_shutdown_check will be
+	 * called and request cutoff.
+	 */
+	return CRITICAL_SHUTDOWN_IGNORE;
+}