diff options
Diffstat (limited to 'baseboard/kukui/battery_smart.c')
| -rw-r--r-- | baseboard/kukui/battery_smart.c | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/baseboard/kukui/battery_smart.c b/baseboard/kukui/battery_smart.c index 7a58644e53..3cd8facd5e 100644 --- a/baseboard/kukui/battery_smart.c +++ b/baseboard/kukui/battery_smart.c @@ -8,6 +8,8 @@ #include "battery.h" #include "battery_fuel_gauge.h" #include "battery_smart.h" +#include "timer.h" +#include "util.h" enum battery_present batt_pres_prev = BP_NOT_SURE; @@ -65,3 +67,78 @@ enum battery_present battery_is_present(void) batt_pres_prev = battery_check_present_status(); return batt_pres_prev; } + +#ifdef CONFIG_I2C_BITBANG +static void fix_single_param(int flag, int *cached, int *curr) +{ + if (flag) + *curr = *cached; + else + *cached = *curr; +} + +#define CACHE_INVALIDATION_TIME_US (5 * SECOND) + +/* + * b:144195782: bitbang fails randomly, and there's no way to + * notify kernel side that bitbang read failed. + * Thus, if any value in batt_params is bad, replace it with a cached + * good value, to make sure we never send random numbers to kernel + * side. + */ +__override void board_battery_compensate_params(struct batt_params *batt) +{ + static struct batt_params batt_cache = { 0 }; + static timestamp_t deadline; + + /* + * If battery keeps failing for 5 seconds, stop hiding the error and + * report back to host. + */ + if (batt->flags & BATT_FLAG_BAD_ANY) { + if (timestamp_expired(deadline, NULL)) + return; + } else { + deadline.val = get_time().val + CACHE_INVALIDATION_TIME_US; + } + + /* return cached values for at most CACHE_INVALIDATION_TIME_US */ + fix_single_param(batt->flags & BATT_FLAG_BAD_STATE_OF_CHARGE, + &batt_cache.state_of_charge, + &batt->state_of_charge); + fix_single_param(batt->flags & BATT_FLAG_BAD_VOLTAGE, + &batt_cache.voltage, + &batt->voltage); + fix_single_param(batt->flags & BATT_FLAG_BAD_CURRENT, + &batt_cache.current, + &batt->current); + fix_single_param(batt->flags & BATT_FLAG_BAD_DESIRED_VOLTAGE, + &batt_cache.desired_voltage, + &batt->desired_voltage); + fix_single_param(batt->flags & BATT_FLAG_BAD_DESIRED_CURRENT, + &batt_cache.desired_current, + &batt->desired_current); + fix_single_param(batt->flags & BATT_FLAG_BAD_REMAINING_CAPACITY, + &batt_cache.remaining_capacity, + &batt->remaining_capacity); + fix_single_param(batt->flags & BATT_FLAG_BAD_FULL_CAPACITY, + &batt_cache.full_capacity, + &batt->full_capacity); + fix_single_param(batt->flags & BATT_FLAG_BAD_STATUS, + &batt_cache.status, + &batt->status); + fix_single_param(batt->flags & BATT_FLAG_BAD_TEMPERATURE, + &batt_cache.temperature, + &batt->temperature); + /* + * If battery_compensate_params() didn't calculate display_charge + * for us, also update it with last good value. + */ + fix_single_param(batt->display_charge == 0, + &batt_cache.display_charge, + &batt->display_charge); + + /* remove bad flags after applying cached values */ + batt->flags &= ~BATT_FLAG_BAD_ANY; +} +#endif /* CONFIG_I2C_BITBANG */ |