diff options
Diffstat (limited to 'common/battery.c')
| -rw-r--r-- | common/battery.c | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/common/battery.c b/common/battery.c index 9d380efe86..346b9207b8 100644 --- a/common/battery.c +++ b/common/battery.c @@ -26,6 +26,7 @@ * TODO: Allow host (powerd) to update it. */ static int batt_full_factor = CONFIG_BATT_FULL_FACTOR; +static int batt_host_shutdown_pct = CONFIG_BATT_HOST_SHUTDOWN_PERCENTAGE; #ifdef CONFIG_BATTERY_V2 /* @@ -565,6 +566,7 @@ DECLARE_HOOK(HOOK_INIT, battery_init, HOOK_PRIO_DEFAULT); void battery_compensate_params(struct batt_params *batt) { + int numer, denom; int remain = batt->remaining_capacity; int full = batt->full_capacity; @@ -575,8 +577,21 @@ void battery_compensate_params(struct batt_params *batt) if (remain <= 0 || full <= 0) return; - if (remain * 100 > full * batt_full_factor) + if (remain * 100 > full * batt_full_factor) { batt->remaining_capacity = full; + batt->display_charge = 1000; + return; + } + + /* + * Powerd uses the following equation to calculate display percentage: + * charge = remain/full; + * 100 * (charge - shutdown_pct) / (full_factor - shutdown_pct); + */ + numer = (100 * remain - full * batt_host_shutdown_pct) * 1000; + denom = full * (batt_full_factor - batt_host_shutdown_pct); + /* Rounding (instead of truncating) */ + batt->display_charge = (numer + denom / 2) / denom; } __attribute__((weak)) int get_battery_manufacturer_name(char *dest, int size) |