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charger v2: Don't report 0 battery charge if we're running off battery

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Some batteries report 0 charge when their charge level is very low.
powerd has a special interpretation of 0 charge, which causes
low-battery shutdown to not occur. Work-around this powerd behavior by
never reporting 0 charge if our battery is discharging.

BUG=chrome-os-partner:35188
TEST=Manual on Samus. Drain battery to critically low level, verify that
powerd correctly shuts down system.
BRANCH=Samus

Change-Id: I6bd50e038f0e22de7e7de754fa2ea459dc662f35
Signed-off-by: Shawn Nematbakhsh <shawnn@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/241101
Reviewed-by: Bill Richardson <wfrichar@chromium.org>
This commit is contained in:
Shawn Nematbakhsh
2015-01-15 14:49:04 -08:00
committed by ChromeOS Commit Bot
parent 94515d9ee2
commit 93bb7195a8
1 changed files with 11 additions and 2 deletions
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13
common/charge_state_v2.c
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@@ -186,8 +186,17 @@ static void update_dynamic_battery_info(void)
if (!(curr.batt.flags & BATT_FLAG_BAD_CURRENT))
*memmap_rate = ABS(curr.batt.current);
if (!(curr.batt.flags & BATT_FLAG_BAD_REMAINING_CAPACITY))
*memmap_cap = curr.batt.remaining_capacity;
if (!(curr.batt.flags & BATT_FLAG_BAD_REMAINING_CAPACITY)) {
/*
* If we're running off the battery, it must have some charge.
* Don't report zero charge, as that has special meaning
* to Chrome OS powerd.
*/
if (curr.batt.remaining_capacity == 0 && !curr.batt_is_charging)
*memmap_cap = 1;
else
*memmap_cap = curr.batt.remaining_capacity;
}
cap_changed = 0;
if (!(curr.batt.flags & BATT_FLAG_BAD_FULL_CAPACITY) &&