charger-manager: Set current limit of regulator for over current protection

This patch support the protection of host device from over current.
The Charger-manager set proper current limit of charger(regulator) for
charging according to type of charger cable when external connector
is attached.

Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: Myungjoo Ham <myungjoo.ham@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org>

diff --git a/drivers/power/charger-manager.c b/drivers/power/charger-manager.c
index d1e99e7..526e5c9 100644 (file)
--- a/drivers/power/charger-manager.c
+++ b/drivers/power/charger-manager.c
@@ -1001,6 +1001,21 @@ static void charger_extcon_work(struct work_struct *work)
 {
        struct charger_cable *cable =
                        container_of(work, struct charger_cable, wq);
+       int ret;
+
+       if (cable->attached && cable->min_uA != 0 && cable->max_uA != 0) {
+               ret = regulator_set_current_limit(cable->charger->consumer,
+                                       cable->min_uA, cable->max_uA);
+               if (ret < 0) {
+                       pr_err("Cannot set current limit of %s (%s)\n",
+                               cable->charger->regulator_name, cable->name);
+                       return;
+               }
+
+               pr_info("Set current limit of %s : %duA ~ %duA\n",
+                                       cable->charger->regulator_name,
+                                       cable->min_uA, cable->max_uA);
+       }
 
        try_charger_enable(cable->cm, cable->attached);
 }

diff --git a/include/linux/power/charger-manager.h b/include/linux/power/charger-manager.h
index 6cb9fbc..cd22029 100644 (file)
--- a/include/linux/power/charger-manager.h
+++ b/include/linux/power/charger-manager.h
@@ -94,6 +94,14 @@ struct charger_cable {
        bool attached;
 
        struct charger_regulator *charger;
+
+       /*
+        * Set min/max current of regulator to protect over-current issue
+        * according to a kind of charger cable when cable is attached.
+        */
+       int min_uA;
+       int max_uA;
+
        struct charger_manager *cm;
 };