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charger-manager: Support limit of maximum possible
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>
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@ -323,6 +323,14 @@ static int try_charger_enable(struct charger_manager *cm, bool enable)
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if (enable) {
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if (cm->emergency_stop)
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return -EAGAIN;
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/*
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* Save start time of charging to limit
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* maximum possible charging time.
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*/
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cm->charging_start_time = ktime_to_ms(ktime_get());
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cm->charging_end_time = 0;
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for (i = 0 ; i < desc->num_charger_regulators ; i++) {
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err = regulator_enable(desc->charger_regulators[i].consumer);
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if (err < 0) {
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@ -332,6 +340,13 @@ static int try_charger_enable(struct charger_manager *cm, bool enable)
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}
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}
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} else {
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/*
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* Save end time of charging to maintain fully charged state
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* of battery after full-batt.
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*/
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cm->charging_start_time = 0;
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cm->charging_end_time = ktime_to_ms(ktime_get());
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for (i = 0 ; i < desc->num_charger_regulators ; i++) {
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err = regulator_disable(desc->charger_regulators[i].consumer);
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if (err < 0) {
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@ -474,10 +489,57 @@ static void fullbatt_vchk(struct work_struct *work)
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if (diff > desc->fullbatt_vchkdrop_uV) {
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try_charger_restart(cm);
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uevent_notify(cm, "Recharge");
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uevent_notify(cm, "Recharging");
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}
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}
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/**
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* check_charging_duration - Monitor charging/discharging duration
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* @cm: the Charger Manager representing the battery.
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*
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* If whole charging duration exceed 'charging_max_duration_ms',
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* cm stop charging to prevent overcharge/overheat. If discharging
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* duration exceed 'discharging _max_duration_ms', charger cable is
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* attached, after full-batt, cm start charging to maintain fully
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* charged state for battery.
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*/
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static int check_charging_duration(struct charger_manager *cm)
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{
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struct charger_desc *desc = cm->desc;
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u64 curr = ktime_to_ms(ktime_get());
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u64 duration;
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int ret = false;
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if (!desc->charging_max_duration_ms &&
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!desc->discharging_max_duration_ms)
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return ret;
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if (cm->charger_enabled) {
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duration = curr - cm->charging_start_time;
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if (duration > desc->charging_max_duration_ms) {
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dev_info(cm->dev, "Charging duration exceed %lldms",
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desc->charging_max_duration_ms);
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uevent_notify(cm, "Discharging");
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try_charger_enable(cm, false);
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ret = true;
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}
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} else if (is_ext_pwr_online(cm) && !cm->charger_enabled) {
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duration = curr - cm->charging_end_time;
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if (duration > desc->charging_max_duration_ms &&
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is_ext_pwr_online(cm)) {
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dev_info(cm->dev, "DisCharging duration exceed %lldms",
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desc->discharging_max_duration_ms);
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uevent_notify(cm, "Recharing");
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try_charger_enable(cm, true);
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ret = true;
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}
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}
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return ret;
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}
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/**
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* _cm_monitor - Monitor the temperature and return true for exceptions.
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* @cm: the Charger Manager representing the battery.
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@ -510,6 +572,13 @@ static bool _cm_monitor(struct charger_manager *cm)
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uevent_notify(cm, "COLD");
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}
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/*
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* Check whole charging duration and discharing duration
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* after full-batt.
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*/
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} else if (!cm->emergency_stop && check_charging_duration(cm)) {
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dev_dbg(cm->dev,
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"Charging/Discharging duration is out of range");
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/*
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* Check dropped voltage of battery. If battery voltage is more
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* dropped than fullbatt_vchkdrop_uV after fully charged state,
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@ -1271,6 +1340,15 @@ static int charger_manager_probe(struct platform_device *pdev)
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goto err_chg_stat;
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}
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if (!desc->charging_max_duration_ms ||
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!desc->discharging_max_duration_ms) {
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dev_info(&pdev->dev, "Cannot limit charging duration "
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"checking mechanism to prevent overcharge/overheat "
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"and control discharging duration");
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desc->charging_max_duration_ms = 0;
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desc->discharging_max_duration_ms = 0;
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}
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platform_set_drvdata(pdev, cm);
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memcpy(&cm->charger_psy, &psy_default, sizeof(psy_default));
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@ -162,6 +162,13 @@ struct charger_regulator {
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* @measure_battery_temp:
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* true: measure battery temperature
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* false: measure ambient temperature
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* @charging_max_duration_ms: Maximum possible duration for charging
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* If whole charging duration exceed 'charging_max_duration_ms',
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* cm stop charging.
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* @discharging_max_duration_ms:
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* Maximum possible duration for discharging with charger cable
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* after full-batt. If discharging duration exceed 'discharging
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* max_duration_ms', cm start charging.
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*/
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struct charger_desc {
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char *psy_name;
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@ -186,6 +193,9 @@ struct charger_desc {
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int (*temperature_out_of_range)(int *mC);
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bool measure_battery_temp;
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u64 charging_max_duration_ms;
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u64 discharging_max_duration_ms;
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};
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#define PSY_NAME_MAX 30
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@ -210,6 +220,8 @@ struct charger_desc {
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* saved status of external power before entering suspend-to-RAM
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* @status_save_batt:
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* saved status of battery before entering suspend-to-RAM
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* @charging_start_time: saved start time of enabling charging
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* @charging_end_time: saved end time of disabling charging
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*/
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struct charger_manager {
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struct list_head entry;
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@ -232,6 +244,9 @@ struct charger_manager {
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bool status_save_ext_pwr_inserted;
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bool status_save_batt;
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u64 charging_start_time;
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u64 charging_end_time;
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};
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#ifdef CONFIG_CHARGER_MANAGER
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