ab8500-bm: Quick re-attach charging behaviour

Due to a bug in some AB8500 ASICs charger removal cannot always
be detected if the removal and reinsertion is done to close in time.
This patch detects above described case and handles the situation
so that charging will be kept turned on.

Signed-off-by: Lee Jones <lee.jones@linaro.org>

1 files changed, 33 insertions, 0 deletions

diff --git a/drivers/power/abx500_chargalg.c b/drivers/power/abx500_chargalg.c
index 31507bfe549c..8ab65a3a8190 100644
--- a/drivers/power/abx500_chargalg.c
+++ b/drivers/power/abx500_chargalg.c
@@ -305,6 +305,30 @@ static void abx500_chargalg_state_to(struct abx500_chargalg *di,
 	di->charge_state = state;
 }
 
+static int abx500_chargalg_check_charger_enable(struct abx500_chargalg *di)
+{
+	switch (di->charge_state) {
+	case STATE_NORMAL:
+	case STATE_MAINTENANCE_A:
+	case STATE_MAINTENANCE_B:
+		break;
+	default:
+		return 0;
+	}
+
+	if (di->chg_info.charger_type & USB_CHG) {
+		return di->usb_chg->ops.check_enable(di->usb_chg,
+                         di->bm->bat_type[di->bm->batt_id].normal_vol_lvl,
+                         di->bm->bat_type[di->bm->batt_id].normal_cur_lvl);
+	} else if ((di->chg_info.charger_type & AC_CHG) &&
+		   !(di->ac_chg->external)) {
+		return di->ac_chg->ops.check_enable(di->ac_chg,
+                         di->bm->bat_type[di->bm->batt_id].normal_vol_lvl,
+                         di->bm->bat_type[di->bm->batt_id].normal_cur_lvl);
+	}
+	return 0;
+}
+
 /**
  * abx500_chargalg_check_charger_connection() - Check charger connection change
  * @di:		pointer to the abx500_chargalg structure
@@ -1219,6 +1243,7 @@ static void abx500_chargalg_external_power_changed(struct power_supply *psy)
 static void abx500_chargalg_algorithm(struct abx500_chargalg *di)
 {
 	int charger_status;
+	int ret;
 
 	/* Collect data from all power_supply class devices */
 	class_for_each_device(power_supply_class, NULL,
@@ -1229,6 +1254,14 @@ static void abx500_chargalg_algorithm(struct abx500_chargalg *di)
 	abx500_chargalg_check_charger_voltage(di);
 
 	charger_status = abx500_chargalg_check_charger_connection(di);
+
+	if (is_ab8500(di->parent)) {
+		ret = abx500_chargalg_check_charger_enable(di);
+		if (ret < 0)
+			dev_err(di->dev, "Checking charger is enabled error"
+					": Returned Value %d\n", ret);
+	}
+
 	/*
 	 * First check if we have a charger connected.
 	 * Also we don't allow charging of unknown batteries if configured