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Add hysteresis to host events for battery capacity changed

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Adds a small threshold for sending a host event to battery whenever
the full capacity changes. This helps avoid constant host events
when the battery decides the capacity is going back and forth 1mAh

BUG=none
BRANCH=none
TEST=load on samus. set LFCC_EVENT_THRESHOLD to 1 and see host
events very often. set LFCC_EVENT_THRESHOLD to 5 and see no host
events.

Change-Id: I2dc38f04e1a634539837dfed19b10ccfcfd0a8a3
Signed-off-by: Alec Berg <alecaberg@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/213668
Reviewed-by: Bill Richardson <wfrichar@chromium.org>
This commit is contained in:
Alec Berg
2014-08-21 15:37:23 -07:00
committed by chrome-internal-fetch
parent e307172bd5
commit 1b82905cfe
1 changed files with 3 additions and 1 deletions
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4
common/charge_state_v2.c
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@@ -29,6 +29,7 @@
#define LOW_BATTERY_SHUTDOWN_TIMEOUT_US (LOW_BATTERY_SHUTDOWN_TIMEOUT * SECOND)
#define PRECHARGE_TIMEOUT_US (PRECHARGE_TIMEOUT * SECOND)
#define LFCC_EVENT_THRESH 5 /* Full-capacity change reqd for host event */
/*
* State for charger_task(). Here so we can reset it on a HOOK_INIT, and
@@ -187,7 +188,8 @@ static void update_dynamic_battery_info(void)
cap_changed = 0;
if (!(curr.batt.flags & BATT_FLAG_BAD_FULL_CAPACITY) &&
curr.batt.full_capacity != *memmap_lfcc) {
(curr.batt.full_capacity <= (*memmap_lfcc - LFCC_EVENT_THRESH) ||
curr.batt.full_capacity >= (*memmap_lfcc + LFCC_EVENT_THRESH))) {
*memmap_lfcc = curr.batt.full_capacity;
cap_changed = 1;
}