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charger-manager: Support limit of maximum possible

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This patch check maximum possible duration of charging/discharging.

If whole charging duration exceed 'desc->charging_max_duration_ms', cm
stop charging to prevent overcharge/overheat. And if discharging duration
exceed, charger cable is attached, after full-batt, cm start charging to
maintain fully charged state for battery.

Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: Myungjoo Ham <myungjoo.ham@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org>
This commit is contained in:
Chanwoo Choi 2012-09-20 21:20:05 -07:00 committed by Anton Vorontsov
parent 2ed9e9b653
commit 8fcfe088e2
2 changed files with 94 additions and 1 deletions
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80
drivers/power/charger-manager.c
View file

@ -323,6 +323,14 @@ static int try_charger_enable(struct charger_manager *cm, bool enable)
if (enable) {
if (cm->emergency_stop)
return -EAGAIN;
/*
* Save start time of charging to limit
* maximum possible charging time.
*/
cm->charging_start_time = ktime_to_ms(ktime_get());
cm->charging_end_time = 0;
for (i = 0 ; i < desc->num_charger_regulators ; i++) {
err = regulator_enable(desc->charger_regulators[i].consumer);
if (err < 0) {
@ -332,6 +340,13 @@ static int try_charger_enable(struct charger_manager *cm, bool enable)
}
}
} else {
/*
* Save end time of charging to maintain fully charged state
* of battery after full-batt.
*/
cm->charging_start_time = 0;
cm->charging_end_time = ktime_to_ms(ktime_get());
for (i = 0 ; i < desc->num_charger_regulators ; i++) {
err = regulator_disable(desc->charger_regulators[i].consumer);
if (err < 0) {
@ -474,10 +489,57 @@ static void fullbatt_vchk(struct work_struct *work)
if (diff > desc->fullbatt_vchkdrop_uV) {
try_charger_restart(cm);
uevent_notify(cm, "Recharge");
uevent_notify(cm, "Recharging");
}
}
/**
* check_charging_duration - Monitor charging/discharging duration
* @cm: the Charger Manager representing the battery.
*
* If whole charging duration exceed 'charging_max_duration_ms',
* cm stop charging to prevent overcharge/overheat. If discharging
* duration exceed 'discharging _max_duration_ms', charger cable is
* attached, after full-batt, cm start charging to maintain fully
* charged state for battery.
*/
static int check_charging_duration(struct charger_manager *cm)
{
struct charger_desc *desc = cm->desc;
u64 curr = ktime_to_ms(ktime_get());
u64 duration;
int ret = false;
if (!desc->charging_max_duration_ms &&
!desc->discharging_max_duration_ms)
return ret;
if (cm->charger_enabled) {
duration = curr - cm->charging_start_time;
if (duration > desc->charging_max_duration_ms) {
dev_info(cm->dev, "Charging duration exceed %lldms",
desc->charging_max_duration_ms);
uevent_notify(cm, "Discharging");
try_charger_enable(cm, false);
ret = true;
}
} else if (is_ext_pwr_online(cm) && !cm->charger_enabled) {
duration = curr - cm->charging_end_time;
if (duration > desc->charging_max_duration_ms &&
is_ext_pwr_online(cm)) {
dev_info(cm->dev, "DisCharging duration exceed %lldms",
desc->discharging_max_duration_ms);
uevent_notify(cm, "Recharing");
try_charger_enable(cm, true);
ret = true;
}
}
return ret;
}
/**
* _cm_monitor - Monitor the temperature and return true for exceptions.
* @cm: the Charger Manager representing the battery.
@ -510,6 +572,13 @@ static bool _cm_monitor(struct charger_manager *cm)
uevent_notify(cm, "COLD");
}
/*
* Check whole charging duration and discharing duration
* after full-batt.
*/
} else if (!cm->emergency_stop && check_charging_duration(cm)) {
dev_dbg(cm->dev,
"Charging/Discharging duration is out of range");
/*
* Check dropped voltage of battery. If battery voltage is more
* dropped than fullbatt_vchkdrop_uV after fully charged state,
@ -1271,6 +1340,15 @@ static int charger_manager_probe(struct platform_device *pdev)
goto err_chg_stat;
}
if (!desc->charging_max_duration_ms ||
!desc->discharging_max_duration_ms) {
dev_info(&pdev->dev, "Cannot limit charging duration "
"checking mechanism to prevent overcharge/overheat "
"and control discharging duration");
desc->charging_max_duration_ms = 0;
desc->discharging_max_duration_ms = 0;
}
platform_set_drvdata(pdev, cm);
memcpy(&cm->charger_psy, &psy_default, sizeof(psy_default));

15
include/linux/power/charger-manager.h
View file

@ -162,6 +162,13 @@ struct charger_regulator {
* @measure_battery_temp:
* true: measure battery temperature
* false: measure ambient temperature
* @charging_max_duration_ms: Maximum possible duration for charging
* If whole charging duration exceed 'charging_max_duration_ms',
* cm stop charging.
* @discharging_max_duration_ms:
* Maximum possible duration for discharging with charger cable
* after full-batt. If discharging duration exceed 'discharging
* max_duration_ms', cm start charging.
*/
struct charger_desc {
char *psy_name;
@ -186,6 +193,9 @@ struct charger_desc {
int (*temperature_out_of_range)(int *mC);
bool measure_battery_temp;
u64 charging_max_duration_ms;
u64 discharging_max_duration_ms;
};
#define PSY_NAME_MAX 30
@ -210,6 +220,8 @@ struct charger_desc {
* saved status of external power before entering suspend-to-RAM
* @status_save_batt:
* saved status of battery before entering suspend-to-RAM
* @charging_start_time: saved start time of enabling charging
* @charging_end_time: saved end time of disabling charging
*/
struct charger_manager {
struct list_head entry;
@ -232,6 +244,9 @@ struct charger_manager {
bool status_save_ext_pwr_inserted;
bool status_save_batt;
u64 charging_start_time;
u64 charging_end_time;
};
#ifdef CONFIG_CHARGER_MANAGER