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power: pm8921-bms: state of charge smoothing

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Prevent the bms from reporting a higher state of charge (SOC)
without charging. Use the start_percent as an indicator whether
the battery was charged.

Change-Id: Ibd664a3b6fc0f8edc2a99b5bed285465b86dc3c4
Signed-off-by: Abhijeet Dharmapurikar <adharmap@codeaurora.org>
This commit is contained in:
Abhijeet Dharmapurikar
2011-11-02 15:40:29 -07:00
parent 3c36baec81
commit 2ce2cc1d40
1 changed files with 28 additions and 10 deletions
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38
drivers/power/pm8921-bms.c
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@@ -89,6 +89,9 @@ struct pm8921_bms_chip {
DECLARE_BITMAP(enabled_irqs, PM_BMS_MAX_INTS);
spinlock_t bms_output_lock;
struct single_row_lut *adjusted_fcc_temp_lut;
unsigned int charging_began;
unsigned int start_percent;
unsigned int end_percent;
};
static struct pm8921_bms_chip *the_chip;
@@ -1102,9 +1105,23 @@ static int calculate_state_of_charge(struct pm8921_bms_chip *chip,
update_userspace = 0;
}
if (update_userspace) {
last_soc = soc;
if (last_soc == -EINVAL || soc <= last_soc) {
last_soc = update_userspace ? soc : last_soc;
return soc;
}
/*
* soc > last_soc
* the device must be charging for reporting a higher soc, if not ignore
* this soc and continue reporting the last_soc
*/
if (the_chip->start_percent != 0) {
last_soc = soc;
} else {
pr_debug("soc = %d reporting last_soc = %d\n", soc, last_soc);
soc = last_soc;
}
return soc;
}
@@ -1645,12 +1662,10 @@ int pm8921_bms_get_fcc(void)
}
EXPORT_SYMBOL_GPL(pm8921_bms_get_fcc);
static int start_percent;
static int end_percent;
void pm8921_bms_charging_began(void)
{
start_percent = pm8921_bms_get_percent_charge();
pr_debug("start_percent = %u%%\n", start_percent);
the_chip->start_percent = pm8921_bms_get_percent_charge();
pr_debug("start_percent = %u%%\n", the_chip->start_percent);
}
EXPORT_SYMBOL_GPL(pm8921_bms_charging_began);
@@ -1676,9 +1691,10 @@ void pm8921_bms_charging_end(int is_battery_full)
}
charge_cycle_calculation:
end_percent = pm8921_bms_get_percent_charge();
if (end_percent > start_percent) {
last_charge_increase = end_percent - start_percent;
the_chip->end_percent = pm8921_bms_get_percent_charge();
if (the_chip->end_percent > the_chip->start_percent) {
last_charge_increase =
the_chip->end_percent - the_chip->start_percent;
if (last_charge_increase > 100) {
last_chargecycles++;
last_charge_increase = last_charge_increase % 100;
@@ -1686,9 +1702,11 @@ charge_cycle_calculation:
}
pr_debug("end_percent = %u%% last_charge_increase = %d"
"last_chargecycles = %d\n",
end_percent,
the_chip->end_percent,
last_charge_increase,
last_chargecycles);
the_chip->start_percent = 0;
the_chip->end_percent = 0;
}
EXPORT_SYMBOL_GPL(pm8921_bms_charging_end);