power: charger-manager: Add sysfs node for disabling charger

The new attribute 'disable_charge' will be added to
"/sys/devices/virtual/power_supply/battery/" If this attribute is
set to 1, battery charging will completely stop within 'discharging'
state, and it cannot be resumed until the node is set to 0 or the
target is rebooted.

Change-Id: Ie2d855a25d0b1660598a7b2821871334aa8c75a2
Signed-off-by: Dongwoo Lee <dwoo08.lee@samsung.com>

diff --git a/drivers/power/charger-manager.c b/drivers/power/charger-manager.c
index 01a673c..89ecc03 100644 (file)
--- a/drivers/power/charger-manager.c
+++ b/drivers/power/charger-manager.c
@@ -190,6 +190,8 @@ static bool is_charging(struct charger_manager *cm)
                        continue;
                if (!cm->charger_enabled)
                        continue;
+               if (cm->disable_charge)
+                       continue;
 
                psy = power_supply_get_by_name(cm->desc->psy_charger_stat[i]);
                if (!psy) {
@@ -346,8 +348,11 @@ static int try_charger_enable(struct charger_manager *cm, bool enable)
        int err = 0, i;
        struct charger_desc *desc = cm->desc;
 
-       /* Ignore if it's redundent command */
-       if (enable == cm->charger_enabled)
+       /*
+        * Ignore redundant command and prevent enabling charger
+        * if it is disabled.
+        */
+       if (enable == cm->charger_enabled || (enable && cm->disable_charge))
                return 0;
 
        if (enable) {
@@ -510,6 +515,9 @@ static int cm_check_thermal_status(struct charger_manager *cm)
  */
 static int cm_get_target_status(struct charger_manager *cm)
 {
+       if (cm->disable_charge)
+               return POWER_SUPPLY_STATUS_DISCHARGING;
+
        if (!is_ext_pwr_online(cm))
                return POWER_SUPPLY_STATUS_DISCHARGING;
 
@@ -1167,10 +1175,57 @@ static ssize_t store_polling_ms(struct device *dev,
        return count;
 }
 
+static ssize_t show_disable_charge(struct device *dev,
+                               struct device_attribute *attr, char *buf)
+{
+       struct charger_manager *cm;
+
+       list_for_each_entry(cm, &cm_list, entry)
+               if (&cm->charger_psy->dev == dev)
+                       break;
+
+       if (&cm->charger_psy->dev != dev)
+               return -ENODEV;
+
+       return sprintf(buf, "%d\n", cm->disable_charge);
+}
+
+static ssize_t store_disable_charge(struct device *dev,
+                               struct device_attribute *attr, const char *buf,
+                               size_t count)
+{
+       struct charger_manager *cm;
+       unsigned long disable_charge;
+
+       if (kstrtoul(buf, 0, &disable_charge))
+               return -EINVAL;
+
+       list_for_each_entry(cm, &cm_list, entry)
+               if (&cm->charger_psy->dev == dev)
+                       break;
+
+       if (&cm->charger_psy->dev != dev)
+               return -ENODEV;
+
+       disable_charge = !!disable_charge;
+
+       if (disable_charge == cm->disable_charge)
+               return count;
+
+       cm->disable_charge = disable_charge;
+
+       _cm_monitor(cm);
+
+       return count;
+}
+
 static DEVICE_ATTR(polling_ms, 0644, show_polling_ms, store_polling_ms);
+static DEVICE_ATTR(disable_charge, 0644,
+                  show_disable_charge, store_disable_charge);
 
 static struct attribute *charger_manager_attrs[] = {
        &dev_attr_polling_ms.attr,
+       &dev_attr_disable_charge.attr,
        NULL,
 };
 

diff --git a/include/linux/power/charger-manager.h b/include/linux/power/charger-manager.h
index 835d933..1afe5e2 100644 (file)
--- a/include/linux/power/charger-manager.h
+++ b/include/linux/power/charger-manager.h
@@ -233,6 +233,7 @@ struct charger_manager {
        struct thermal_zone_device *tzd_batt;
 
        bool charger_enabled;
+       bool disable_charge;
 
        int emergency_stop;