charger-manager: Add support sysfs entry for charger

This patch add support sysfs entry for each charger(regulator).
Charger-manager use one or more chargers for charging battery but some
charger isn't necessary on specific scenario. So, if some charger isn't
needed, can disable specific charger through 'externally_control' entry
while system is on state and confirm the information(name, state) of
charger.

The list of added sysfs entry
- /sys/class/power_supply/battery/chargers/charger.[index]/name
  show name of charger(regulator)
- /sys/class/power_supply/battery/chargers/charger.[index]/state
  show either enabled or disabled state of charger
- /sys/class/power_supply/battery/chargers/charger.[index]/externally_control

If 'externally_control' of specific charger is 1, Charger-manager cannot
enable regulator for charging when charger cable is attached and charger
must be maintained with disabled state. If 'externally_control' is zero,
Charger-manager usually can control to enable/disable regulator.

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, 19 insertions, 0 deletions

diff --git a/include/linux/power/charger-manager.h b/include/linux/power/charger-manager.h
index a7b388ea1588..0e86840eb603 100644
--- a/include/linux/power/charger-manager.h
+++ b/include/linux/power/charger-manager.h
@@ -109,24 +109,43 @@ struct charger_cable {
  * struct charger_regulator
  * @regulator_name: the name of regulator for using charger.
  * @consumer: the regulator consumer for the charger.
+ * @externally_control:
+ *      Set if the charger-manager cannot control charger,
+ *      the charger will be maintained with disabled state.
  * @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.
+ * @attr_g: Attribute group for the charger(regulator)
+ * @attr_name: "name" sysfs entry
+ * @attr_state: "state" sysfs entry
+ * @attr_externally_control: "externally_control" sysfs entry
+ * @attrs: Arrays pointing to attr_name/state/externally_control for attr_g
  */
 struct charger_regulator {
         /* The name of regulator for charging */
         const char *regulator_name;
         struct regulator *consumer;
 
+        /* charger never on when system is on */
+        int externally_control;
+
         /*
          * Store constraint information related to current limit,
          * each cable have different condition for charging.
          */
         struct charger_cable *cables;
         int num_cables;
+
+        struct attribute_group attr_g;
+        struct device_attribute attr_name;
+        struct device_attribute attr_state;
+        struct device_attribute attr_externally_control;
+        struct attribute *attrs[4];
+
+        struct charger_manager *cm;
 };
 
 /**