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snow: Check state of charge using moving average

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Signed-off-by: Rong Chang <rongchang@chromium.org>
BRANCH=snow
BUG=chrome-os-partner:13846
TEST=manual
  Connect EC UART console and discharge snow device. The system should
  be turned off when average state of charge is lower than 2.5%.

Change-Id: Iab9797d0aa6b159bedd8ce0d2fa72c6458cd14ac
Reviewed-on: https://gerrit.chromium.org/gerrit/32693
Commit-Ready: Rong Chang <rongchang@chromium.org>
Tested-by: Rong Chang <rongchang@chromium.org>
Reviewed-by: Sameer Nanda <snanda@chromium.org>
Reviewed-by: David Hendricks <dhendrix@chromium.org>
This commit is contained in:
Rong Chang
2012-09-10 15:33:43 +08:00
committed by Gerrit
parent d392ed7266
commit e21db5e488
1 changed files with 38 additions and 1 deletions
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39
common/pmu_tps65090_charger.c
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@@ -129,6 +129,39 @@ static int notify_battery_low(void)
return ST_DISCHARGING;
}
/*
* Calculate relative state of charge moving average
*
* The returned value will be rounded to the nearest integer, by set moving
* average init value to (0.5 * window_size).
*
*/
static int rsoc_moving_average(int state_of_charge)
{
static uint8_t rsoc[4];
static int8_t index = -1;
int moving_average = sizeof(rsoc) / 2;
int i;
if (index < 0) {
for (i = 0; i < sizeof(rsoc); i++)
rsoc[i] = (uint8_t)state_of_charge;
index = 0;
return state_of_charge;
}
rsoc[index] = (uint8_t)state_of_charge;
index++;
index %= sizeof(rsoc);
for (i = 0; i < sizeof(rsoc); i++)
moving_average += (int)rsoc[i];
moving_average /= sizeof(rsoc);
return moving_average;
}
static int config_low_current_charging(int charge)
{
/* Disable low current termination */
@@ -305,7 +338,11 @@ static int calc_next_state(int state)
}
/* Check remaining charge % */
if (battery_state_of_charge(&capacity) == 0) {
if (capacity < 3) {
/*
* Shutdown AP when state of charge < 2.5%.
* Moving average is rounded to integer.
*/
if (rsoc_moving_average(capacity) < 3) {
system_off();
return ST_IDLE;
} else if (capacity < 10) {