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>
diff --git a/drivers/power/charger-manager.c b/drivers/power/charger-manager.c
index c701f5e..e92ec55 100644
--- a/drivers/power/charger-manager.c
+++ b/drivers/power/charger-manager.c
@@ -323,6 +323,14 @@
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 @@
}
}
} 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) {
@@ -474,11 +489,58 @@
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.
*
@@ -511,6 +573,13 @@
}
/*
+ * 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,
* charger-manager have to recharge battery.
@@ -1271,6 +1340,15 @@
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));