power: battery: sec-battery: Add support for disabling battery charge

The new attribute "disable_charge" will be added. If this attribute is
set to 1, battery charging completely stops within "discharging"
state, and it cannot resume until restoring the attribute as 0 or
rebooting the target.

Change-Id: I0638bf73ba89d72c34d1c338a411e6d4978060db
Signed-off-by: Dongwoo Lee <dwoo08.lee@samsung.com>

diff --git a/drivers/battery/sec_battery.c b/drivers/battery/sec_battery.c
index e40f1071d86cdd66577903f5cd8823464791315c..7238a5650c6e4609c3f32c0c2628a630cc4d1b34 100644 (file)
--- a/drivers/battery/sec_battery.c
+++ b/drivers/battery/sec_battery.c
@@ -111,6 +111,7 @@ static struct device_attribute sec_battery_attrs[] = {
        SEC_BATTERY_ATTR(chg_extreme_onoff),
        SEC_BATTERY_ATTR(chg_extreme_mode),
        SEC_BATTERY_ATTR(chg_on),
+       SEC_BATTERY_ATTR(disable_charge),
 };
 
 static enum power_supply_property sec_battery_props[] = {
@@ -219,6 +220,11 @@ static int sec_bat_set_charge(
                return 0;
        }
 
+       if (battery->disable_charge && enable) {
+               dev_warn(battery->dev, "charging is disabled explicitly.\n");
+               return 0;
+       }
+
        val.intval = battery->status;
        psy_do_property(battery->pdata->charger_name, set,
                POWER_SUPPLY_PROP_STATUS, val);
@@ -678,6 +684,10 @@ static bool sec_bat_get_cable_type(
 static void sec_bat_set_charging_status(struct sec_battery_info *battery,
                int status) {
        union power_supply_propval value;
+
+       if (battery->disable_charge && status == POWER_SUPPLY_STATUS_CHARGING)
+               return;
+
        switch (status) {
        case POWER_SUPPLY_STATUS_NOT_CHARGING:
        case POWER_SUPPLY_STATUS_DISCHARGING:
@@ -3952,6 +3962,10 @@ ssize_t sec_bat_show_attrs(struct device *dev,
                i += scnprintf(buf + i, PAGE_SIZE - i, "%d\n",
                        (battery->charging_block == false) ? 1 : 0);
                break;
+       case BATT_DISABLE_CHARGE:
+               i += scnprintf(buf + i, PAGE_SIZE - i, "%d\n",
+                       (battery->disable_charge) ? 1 : 0);
+               break;
        default:
                i = -EINVAL;
        }
@@ -4604,6 +4618,37 @@ ssize_t sec_bat_store_attrs(
                        ret = count;
                }
                break;
+       case BATT_DISABLE_CHARGE:
+               if (sscanf(buf, "%d\n", &x) != 1)
+                       break;
+               if (!!x) {
+                       /* force disabling battery charge */
+                       battery->disable_charge = 1;
+                       sec_bat_set_charging_status(battery,
+                                       POWER_SUPPLY_STATUS_DISCHARGING);
+                       sec_bat_set_charge(battery, false);
+                       power_supply_changed(&battery->psy_bat);
+               } else {
+                       union power_supply_propval value;
+
+                       battery->disable_charge = 0;
+                       sec_bat_get_cable_type(battery,
+                                       battery->pdata->cable_source_type);
+
+                       /* enable charger if connected */
+                       if (battery->cable_type != POWER_SUPPLY_TYPE_BATTERY &&
+                           battery->cable_type != POWER_SUPPLY_TYPE_OTG) {
+                               sec_bat_set_charge(battery, true);
+                               psy_do_property(battery->pdata->charger_name,
+                                               get, POWER_SUPPLY_PROP_STATUS,
+                                               value);
+                               sec_bat_set_charging_status(battery,
+                                                               value.intval);
+                               power_supply_changed(&battery->psy_bat);
+                       }
+               }
+               ret = count;
+               break;
        default:
                ret = -EINVAL;
        }

diff --git a/include/linux/battery/sec_battery.h b/include/linux/battery/sec_battery.h
index 53642cbc889d11d3896396f3c6941050ab96b584..c256259ccee0658ca91af53908d045833feba086 100644 (file)
--- a/include/linux/battery/sec_battery.h
+++ b/include/linux/battery/sec_battery.h
@@ -226,6 +226,7 @@ struct sec_battery_info {
 #if defined(CONFIG_AFC_CHARGER_MODE)
        char *hv_chg_name;
 #endif
+       int disable_charge;
 };
 
 ssize_t sec_bat_show_attrs(struct device *dev,
@@ -348,6 +349,7 @@ enum {
        CHG_EXTREME_ONOFF,
        CHG_EXTREME_MODE,
        CHG_ON,
+       BATT_DISABLE_CHARGE,
 };
 
 #ifdef CONFIG_OF