charger-manager: Use EXTCON Subsystem to detect charger cables for charging

This patch support that charger-manager use EXTCON(External Connector)
Subsystem to detect the state of charger cables for enabling or disabling
charger(regulator) and select the charger cable for charging among
a number of external cable according to policy of H/W board.

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>

1 files changed, 58 insertions, 1 deletions

diff --git a/include/linux/power/charger-manager.h b/include/linux/power/charger-manager.h
index 241065c9ce51..6cb9fbc9a153 100644
--- a/include/linux/power/charger-manager.h
+++ b/include/linux/power/charger-manager.h
@@ -16,6 +16,7 @@
 #define _CHARGER_MANAGER_H
 
 #include <linux/power_supply.h>
+#include <linux/extcon.h>
 
 enum data_source {
         CM_BATTERY_PRESENT,
@@ -65,6 +66,62 @@ struct charger_global_desc {
 };
 
 /**
+ * struct charger_cable
+ * @extcon_name: the name of extcon device.
+ * @name: the name of charger cable(external connector).
+ * @extcon_dev: the extcon device.
+ * @wq: the workqueue to control charger according to the state of
+ *      charger cable. If charger cable is attached, enable charger.
+ *      But if charger cable is detached, disable charger.
+ * @nb: the notifier block to receive changed state from EXTCON
+ *      (External Connector) when charger cable is attached/detached.
+ * @attached: the state of charger cable.
+ *      true: the charger cable is attached
+ *      false: the charger cable is detached
+ * @charger: the instance of struct charger_regulator.
+ * @cm: the Charger Manager representing the battery.
+ */
+struct charger_cable {
+        const char *extcon_name;
+        const char *name;
+
+        /* The charger-manager use Exton framework*/
+        struct extcon_specific_cable_nb extcon_dev;
+        struct work_struct wq;
+        struct notifier_block nb;
+
+        /* The state of charger cable */
+        bool attached;
+
+        struct charger_regulator *charger;
+        struct charger_manager *cm;
+};
+
+/**
+ * struct charger_regulator
+ * @regulator_name: the name of regulator for using charger.
+ * @consumer: the regulator consumer for the charger.
+ * @cables:
+ *      the array of charger cables to enable/disable charger
+ *      and set current limit according to constratint data of
+ *      struct charger_cable if only charger cable included
+ *      in the array of charger cables is attached/detached.
+ * @num_cables: the number of charger cables.
+ */
+struct charger_regulator {
+        /* The name of regulator for charging */
+        const char *regulator_name;
+        struct regulator *consumer;
+
+        /*
+         * Store constraint information related to current limit,
+         * each cable have different condition for charging.
+         */
+        struct charger_cable *cables;
+        int num_cables;
+};
+
+/**
  * struct charger_desc
  * @psy_name: the name of power-supply-class for charger manager
  * @polling_mode:
@@ -109,7 +166,7 @@ struct charger_desc {
         char **psy_charger_stat;
 
         int num_charger_regulators;
-        struct regulator_bulk_data *charger_regulators;
+        struct charger_regulator *charger_regulators;
 
         char *psy_fuel_gauge;