power: supply: charger-manager: Swap private uevent for power_supply_changed

Whenever the battery status is changed, charger manager triggers a uevent
through a private interface. Modify it to use power_supply_changed()
since it belongs to the power supply subsystem.
Signed-off-by: Jonghwa Lee <jonghwa3.lee@samsung.com>
Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Jonathan Bakker <xc-racer2@live.ca>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>

drivers/power/supply/charger-manager.c

@@ -33,18 +33,6 @@
 #define CM_DEFAULT_RECHARGE_TEMP_DIFF	50
 #define CM_DEFAULT_CHARGE_TEMP_MAX	500
 
-static const char * const default_event_names[] = {
-	[CM_EVENT_UNKNOWN] = "Unknown",
-	[CM_EVENT_BATT_FULL] = "Battery Full",
-	[CM_EVENT_BATT_IN] = "Battery Inserted",
-	[CM_EVENT_BATT_OUT] = "Battery Pulled Out",
-	[CM_EVENT_BATT_OVERHEAT] = "Battery Overheat",
-	[CM_EVENT_BATT_COLD] = "Battery Cold",
-	[CM_EVENT_EXT_PWR_IN_OUT] = "External Power Attach/Detach",
-	[CM_EVENT_CHG_START_STOP] = "Charging Start/Stop",
-	[CM_EVENT_OTHERS] = "Other battery events"
-};
-
 /*
  * Regard CM_JIFFIES_SMALL jiffies is small enough to ignore for
  * delayed works so that we can run delayed works with CM_JIFFIES_SMALL
@@ -61,8 +49,6 @@ static const char * const default_event_names[] = {
  */
 #define CM_RTC_SMALL		(2)
 
-#define UEVENT_BUF_SIZE		32
-
 static LIST_HEAD(cm_list);
 static DEFINE_MUTEX(cm_list_mtx);
 
@@ -446,61 +432,6 @@ static int try_charger_restart(struct charger_manager *cm)
 	return try_charger_enable(cm, true);
 }
 
-/**
- * uevent_notify - Let users know something has changed.
- * @cm: the Charger Manager representing the battery.
- * @event: the event string.
- *
- * If @event is null, it implies that uevent_notify is called
- * by resume function. When called in the resume function, cm_suspended
- * should be already reset to false in order to let uevent_notify
- * notify the recent event during the suspend to users. While
- * suspended, uevent_notify does not notify users, but tracks
- * events so that uevent_notify can notify users later after resumed.
- */
-static void uevent_notify(struct charger_manager *cm, const char *event)
-{
-	static char env_str[UEVENT_BUF_SIZE + 1] = "";
-	static char env_str_save[UEVENT_BUF_SIZE + 1] = "";
-
-	if (cm_suspended) {
-		/* Nothing in suspended-event buffer */
-		if (env_str_save[0] == 0) {
-			if (!strncmp(env_str, event, UEVENT_BUF_SIZE))
-				return; /* status not changed */
-			strncpy(env_str_save, event, UEVENT_BUF_SIZE);
-			return;
-		}
-
-		if (!strncmp(env_str_save, event, UEVENT_BUF_SIZE))
-			return; /* Duplicated. */
-		strncpy(env_str_save, event, UEVENT_BUF_SIZE);
-		return;
-	}
-
-	if (event == NULL) {
-		/* No messages pending */
-		if (!env_str_save[0])
-			return;
-
-		strncpy(env_str, env_str_save, UEVENT_BUF_SIZE);
-		kobject_uevent(&cm->dev->kobj, KOBJ_CHANGE);
-		env_str_save[0] = 0;
-
-		return;
-	}
-
-	/* status not changed */
-	if (!strncmp(env_str, event, UEVENT_BUF_SIZE))
-		return;
-
-	/* save the status and notify the update */
-	strncpy(env_str, event, UEVENT_BUF_SIZE);
-	kobject_uevent(&cm->dev->kobj, KOBJ_CHANGE);
-
-	dev_info(cm->dev, "%s\n", event);
-}
-
 /**
  * fullbatt_vchk - Check voltage drop some times after "FULL" event.
  * @work: the work_struct appointing the function
@@ -538,7 +469,7 @@ static void fullbatt_vchk(struct work_struct *work)
 
 	if (diff > desc->fullbatt_vchkdrop_uV) {
 		try_charger_restart(cm);
-		uevent_notify(cm, "Recharging");
+		power_supply_changed(cm->charger_psy);
 	}
 }
 
@@ -569,7 +500,7 @@ static int check_charging_duration(struct charger_manager *cm)
 		if (duration > desc->charging_max_duration_ms) {
 			dev_info(cm->dev, "Charging duration exceed %ums\n",
 				 desc->charging_max_duration_ms);
-			uevent_notify(cm, "Discharging");
+			power_supply_changed(cm->charger_psy);
 			try_charger_enable(cm, false);
 			ret = true;
 		}
@@ -580,7 +511,7 @@ static int check_charging_duration(struct charger_manager *cm)
 				is_ext_pwr_online(cm)) {
 			dev_info(cm->dev, "Discharging duration exceed %ums\n",
 				 desc->discharging_max_duration_ms);
-			uevent_notify(cm, "Recharging");
+			power_supply_changed(cm->charger_psy);
 			try_charger_enable(cm, true);
 			ret = true;
 		}
@@ -688,7 +619,7 @@ static bool _cm_monitor(struct charger_manager *cm)
 	if (temp_alrt) {
 		cm->emergency_stop = temp_alrt;
 		if (!try_charger_enable(cm, false))
-			uevent_notify(cm, default_event_names[temp_alrt]);
+			power_supply_changed(cm->charger_psy);
 
 	/*
 	 * Check whole charging duration and discharging duration
@@ -713,7 +644,7 @@ static bool _cm_monitor(struct charger_manager *cm)
 	} else if (!cm->emergency_stop && is_full_charged(cm) &&
 			cm->charger_enabled) {
 		dev_info(cm->dev, "EVENT_HANDLE: Battery Fully Charged\n");
-		uevent_notify(cm, default_event_names[CM_EVENT_BATT_FULL]);
+		power_supply_changed(cm->charger_psy);
 
 		try_charger_enable(cm, false);
 
@@ -722,7 +653,7 @@ static bool _cm_monitor(struct charger_manager *cm)
 		cm->emergency_stop = 0;
 		if (is_ext_pwr_online(cm)) {
 			if (!try_charger_enable(cm, true))
-				uevent_notify(cm, "CHARGING");
+				power_supply_changed(cm->charger_psy);
 		}
 	}
 
@@ -843,7 +774,7 @@ static void fullbatt_handler(struct charger_manager *cm)
 
 out:
 	dev_info(cm->dev, "EVENT_HANDLE: Battery Fully Charged\n");
-	uevent_notify(cm, default_event_names[CM_EVENT_BATT_FULL]);
+	power_supply_changed(cm->charger_psy);
 }
 
 /**
@@ -857,9 +788,9 @@ static void battout_handler(struct charger_manager *cm)
 
 	if (!is_batt_present(cm)) {
 		dev_emerg(cm->dev, "Battery Pulled Out!\n");
-		uevent_notify(cm, default_event_names[CM_EVENT_BATT_OUT]);
+		power_supply_changed(cm->charger_psy);
 	} else {
-		uevent_notify(cm, "Battery Reinserted?");
+		power_supply_changed(cm->charger_psy);
 	}
 }
 
@@ -876,7 +807,7 @@ static void misc_event_handler(struct charger_manager *cm,
 
 	if (is_polling_required(cm) && cm->desc->polling_interval_ms)
 		schedule_work(&setup_polling);
-	uevent_notify(cm, default_event_names[type]);
+	power_supply_changed(cm->charger_psy);
 }
 
 static int charger_get_property(struct power_supply *psy,
@@ -2048,7 +1979,7 @@ void cm_notify_event(struct power_supply *psy, enum cm_event_types type,
 		break;
 	case CM_EVENT_UNKNOWN:
 	case CM_EVENT_OTHERS:
-		uevent_notify(cm, msg ? msg : default_event_names[type]);
+		power_supply_changed(cm->charger_psy);
 		break;
 	default:
 		dev_err(cm->dev, "%s: type not specified\n", __func__);