charger-manager: Provide cm_notify_event function for in-kernel use

By using cm_notify_event function, charger driver can report several
charger events (e.g. battery full and external power in/out, etc) to
Charger-Manager. Charger-Manager can properly and immediately control
chargers by the reported event.

Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
Signed-off-by: Donggeun Kim <dg77.kim@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org>

1 files changed, 163 insertions, 0 deletions

diff --git a/drivers/power/charger-manager.c b/drivers/power/charger-manager.c
index 959062d16bac..86935ec18954 100644
--- a/drivers/power/charger-manager.c
+++ b/drivers/power/charger-manager.c
@@ -23,6 +23,16 @@
 #include <linux/power/charger-manager.h>
 #include <linux/regulator/consumer.h>
 
+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_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
@@ -525,6 +535,69 @@ static void cm_monitor_poller(struct work_struct *work)
         schedule_work(&setup_polling);
 }
 
+/**
+ * fullbatt_handler - Event handler for CM_EVENT_BATT_FULL
+ * @cm: the Charger Manager representing the battery.
+ */
+static void fullbatt_handler(struct charger_manager *cm)
+{
+        struct charger_desc *desc = cm->desc;
+
+        if (!desc->fullbatt_vchkdrop_uV || !desc->fullbatt_vchkdrop_ms)
+                goto out;
+
+        if (cm_suspended)
+                device_set_wakeup_capable(cm->dev, true);
+
+        if (delayed_work_pending(&cm->fullbatt_vchk_work))
+                cancel_delayed_work(&cm->fullbatt_vchk_work);
+        queue_delayed_work(cm_wq, &cm->fullbatt_vchk_work,
+                           msecs_to_jiffies(desc->fullbatt_vchkdrop_ms));
+        cm->fullbatt_vchk_jiffies_at = jiffies + msecs_to_jiffies(
+                                       desc->fullbatt_vchkdrop_ms);
+
+        if (cm->fullbatt_vchk_jiffies_at == 0)
+                cm->fullbatt_vchk_jiffies_at = 1;
+
+out:
+        dev_info(cm->dev, "EVENT_HANDLE: Battery Fully Charged.\n");
+        uevent_notify(cm, default_event_names[CM_EVENT_BATT_FULL]);
+}
+
+/**
+ * battout_handler - Event handler for CM_EVENT_BATT_OUT
+ * @cm: the Charger Manager representing the battery.
+ */
+static void battout_handler(struct charger_manager *cm)
+{
+        if (cm_suspended)
+                device_set_wakeup_capable(cm->dev, true);
+
+        if (!is_batt_present(cm)) {
+                dev_emerg(cm->dev, "Battery Pulled Out!\n");
+                uevent_notify(cm, default_event_names[CM_EVENT_BATT_OUT]);
+        } else {
+                uevent_notify(cm, "Battery Reinserted?");
+        }
+}
+
+/**
+ * misc_event_handler - Handler for other evnets
+ * @cm: the Charger Manager representing the battery.
+ * @type: the Charger Manager representing the battery.
+ */
+static void misc_event_handler(struct charger_manager *cm,
+                        enum cm_event_types type)
+{
+        if (cm_suspended)
+                device_set_wakeup_capable(cm->dev, true);
+
+        if (!delayed_work_pending(&cm_monitor_work) &&
+            is_polling_required(cm) && cm->desc->polling_interval_ms)
+                schedule_work(&setup_polling);
+        uevent_notify(cm, default_event_names[type]);
+}
+
 static int charger_get_property(struct power_supply *psy,
                 enum power_supply_property psp,
                 union power_supply_propval *val)
@@ -1112,6 +1185,13 @@ static int charger_manager_probe(struct platform_device *pdev)
         list_add(&cm->entry, &cm_list);
         mutex_unlock(&cm_list_mtx);
 
+        /*
+         * Charger-manager is capable of waking up the systme from sleep
+         * when event is happend through cm_notify_event()
+         */
+        device_init_wakeup(&pdev->dev, true);
+        device_set_wakeup_capable(&pdev->dev, false);
+
         schedule_work(&setup_polling);
 
         return 0;
@@ -1169,6 +1249,18 @@ static const struct platform_device_id charger_manager_id[] = {
 };
 MODULE_DEVICE_TABLE(platform, charger_manager_id);
 
+static int cm_suspend_noirq(struct device *dev)
+{
+        int ret = 0;
+
+        if (device_may_wakeup(dev)) {
+                device_set_wakeup_capable(dev, false);
+                ret = -EAGAIN;
+        }
+
+        return ret;
+}
+
 static int cm_suspend_prepare(struct device *dev)
 {
         struct charger_manager *cm = dev_get_drvdata(dev);
@@ -1250,11 +1342,13 @@ static void cm_suspend_complete(struct device *dev)
                 queue_delayed_work(cm_wq, &cm->fullbatt_vchk_work,
                                    msecs_to_jiffies(delay));
         }
+        device_set_wakeup_capable(cm->dev, false);
         uevent_notify(cm, NULL);
 }
 
 static const struct dev_pm_ops charger_manager_pm = {
         .prepare        = cm_suspend_prepare,
+        .suspend_noirq  = cm_suspend_noirq,
         .complete       = cm_suspend_complete,
 };
 
@@ -1287,6 +1381,75 @@ static void __exit charger_manager_cleanup(void)
 }
 module_exit(charger_manager_cleanup);
 
+/**
+ * find_power_supply - find the associated power_supply of charger
+ * @cm: the Charger Manager representing the battery
+ * @psy: pointer to instance of charger's power_supply
+ */
+static bool find_power_supply(struct charger_manager *cm,
+                        struct power_supply *psy)
+{
+        int i;
+        bool found = false;
+
+        for (i = 0; cm->charger_stat[i]; i++) {
+                if (psy == cm->charger_stat[i]) {
+                        found = true;
+                        break;
+                }
+        }
+
+        return found;
+}
+
+/**
+ * cm_notify_event - charger driver notify Charger Manager of charger event
+ * @psy: pointer to instance of charger's power_supply
+ * @type: type of charger event
+ * @msg: optional message passed to uevent_notify fuction
+ */
+void cm_notify_event(struct power_supply *psy, enum cm_event_types type,
+                     char *msg)
+{
+        struct charger_manager *cm;
+        bool found_power_supply = false;
+
+        if (psy == NULL)
+                return;
+
+        mutex_lock(&cm_list_mtx);
+        list_for_each_entry(cm, &cm_list, entry) {
+                found_power_supply = find_power_supply(cm, psy);
+                if (found_power_supply)
+                        break;
+        }
+        mutex_unlock(&cm_list_mtx);
+
+        if (!found_power_supply)
+                return;
+
+        switch (type) {
+        case CM_EVENT_BATT_FULL:
+                fullbatt_handler(cm);
+                break;
+        case CM_EVENT_BATT_OUT:
+                battout_handler(cm);
+                break;
+        case CM_EVENT_BATT_IN:
+        case CM_EVENT_EXT_PWR_IN_OUT ... CM_EVENT_CHG_START_STOP:
+                misc_event_handler(cm, type);
+                break;
+        case CM_EVENT_UNKNOWN:
+        case CM_EVENT_OTHERS:
+                uevent_notify(cm, msg ? msg : default_event_names[type]);
+                break;
+        default:
+                dev_err(cm->dev, "%s type not specified.\n", __func__);
+                break;
+        }
+}
+EXPORT_SYMBOL_GPL(cm_notify_event);
+
 MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
 MODULE_DESCRIPTION("Charger Manager");
 MODULE_LICENSE("GPL");