diff options
Diffstat (limited to 'common/pmu_tps65090_charger.c')
| -rw-r--r-- | common/pmu_tps65090_charger.c | 39 |
1 files changed, 38 insertions, 1 deletions
diff --git a/common/pmu_tps65090_charger.c b/common/pmu_tps65090_charger.c index 2bdc12c3ae..03c2d51f03 100644 --- a/common/pmu_tps65090_charger.c +++ b/common/pmu_tps65090_charger.c @@ -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) { |