[PATCH v2 1/3] power_supply: Add charger control properties

[Jenny TC <jenny.tc@intel.com>]

The battery charger needs to have control path along
with the reporting charger properties. In existing solutions
this is implemented using regulator framework. A regulator
framework doesn't fit a charger driver requirement because of the
following reason
Charger needs support two paths - charger path (charger to platform)
and charging (charger to battery).Disabling the charging path alone
(eg over battery temperature) will allow the platform to work with
power from charger without discharging the battery. And the charger
may need to be disabled completely based on the charger temperature
or the platform temperature.
Charger has more than one pair of voltage/current to control (CC,CV,INLMT)
These features will not directly fit in the regulator framework

Since the charger driver sits in the power supply subsystem it make sense
to add the properties to control the charger.
Signed-off-by: Jenny TC <jenny.tc@intel.com>
---
 Documentation/power/power_supply_class.txt |   16 ++++++++++++++++
 drivers/power/power_supply_sysfs.c         |    8 ++++++++
 include/linux/power_supply.h               |    8 ++++++++
 3 files changed, 32 insertions(+)

diff --git a/Documentation/power/power_supply_class.txt b/Documentation/power/power_supply_class.txt
index 3f10b39..5a5e7fa 100644
--- a/Documentation/power/power_supply_class.txt
+++ b/Documentation/power/power_supply_class.txt
@@ -118,6 +118,10 @@ relative, time-based measurements.
 CONSTANT_CHARGE_CURRENT - constant charge current programmed by charger.
 CONSTANT_CHARGE_CURRENT_MAX - maximum charge current supported by the
 power supply object.
+INPUT_CURRENT_LIMIT - input current limit programmed by charger. Indicates
+the current drawn from a charging source.
+CHARGE_TERM_CUR - Charge termination current used to detect the end of charge
+condition
 
 CONSTANT_CHARGE_VOLTAGE - constant charge voltage programmed by charger.
 CONSTANT_CHARGE_VOLTAGE_MAX - maximum charge voltage supported by the
@@ -140,12 +144,24 @@ TEMP_ALERT_MAX - maximum battery temperature alert value in milli centigrade.
 TEMP_AMBIENT - ambient temperature.
 TEMP_AMBIENT_ALERT_MIN - minimum ambient temperature alert value in milli centigrade.
 TEMP_AMBIENT_ALERT_MAX - maximum ambient temperature alert value in milli centigrade.
+MIN_TEMP - minimum operatable temperature
+MAX_TEMP - maximum operatable temperature
 
 TIME_TO_EMPTY - seconds left for battery to be considered empty (i.e.
 while battery powers a load)
 TIME_TO_FULL - seconds left for battery to be considered full (i.e.
 while battery is charging)
 
+ENABLE_CHARGING - Enable/disable charging. Write is used to enable/disable charging.
+Reading the interface indicates whether the charging is enabled/disabled by the charger h/w.
+ENABLE_CHARGER - Enable/disable charger. Write is used to enable/disable charger.
+Reading the interface indicates whether the charger is enabled/disabled. When charger
+is disabled platform is not expected to draw current from charging source.
+
+CABLE_TYPE - Used to indicate the type of cable used for charging.
+PRIORITY - Indicates the priority of a power supply charger object. Useful
+to setup charging on platforms with multiple charger chips.(Wireless/USB/AC etc.)
+
 
 Battery <-> external power supply interaction
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
diff --git a/drivers/power/power_supply_sysfs.c b/drivers/power/power_supply_sysfs.c
index 29178f7..643971c 100644
--- a/drivers/power/power_supply_sysfs.c
+++ b/drivers/power/power_supply_sysfs.c
@@ -167,6 +167,7 @@ static struct device_attribute power_supply_attrs[] = {
 	POWER_SUPPLY_ATTR(constant_charge_voltage_max),
 	POWER_SUPPLY_ATTR(charge_control_limit),
 	POWER_SUPPLY_ATTR(charge_control_limit_max),
+	POWER_SUPPLY_ATTR(input_cur_limit),
 	POWER_SUPPLY_ATTR(energy_full_design),
 	POWER_SUPPLY_ATTR(energy_empty_design),
 	POWER_SUPPLY_ATTR(energy_full),
@@ -178,6 +179,8 @@ static struct device_attribute power_supply_attrs[] = {
 	POWER_SUPPLY_ATTR(capacity_alert_max),
 	POWER_SUPPLY_ATTR(capacity_level),
 	POWER_SUPPLY_ATTR(temp),
+	POWER_SUPPLY_ATTR(max_temp),
+	POWER_SUPPLY_ATTR(min_temp),
 	POWER_SUPPLY_ATTR(temp_alert_min),
 	POWER_SUPPLY_ATTR(temp_alert_max),
 	POWER_SUPPLY_ATTR(temp_ambient),
@@ -189,6 +192,11 @@ static struct device_attribute power_supply_attrs[] = {
 	POWER_SUPPLY_ATTR(time_to_full_avg),
 	POWER_SUPPLY_ATTR(type),
 	POWER_SUPPLY_ATTR(scope),
+	POWER_SUPPLY_ATTR(charge_term_cur),
+	POWER_SUPPLY_ATTR(enable_charging),
+	POWER_SUPPLY_ATTR(enable_charger),
+	POWER_SUPPLY_ATTR(cable_type),
+	POWER_SUPPLY_ATTR(priority),
 	/* Properties of type `const char *' */
 	POWER_SUPPLY_ATTR(model_name),
 	POWER_SUPPLY_ATTR(manufacturer),
diff --git a/include/linux/power_supply.h b/include/linux/power_supply.h
index 804b906..1265131 100644
--- a/include/linux/power_supply.h
+++ b/include/linux/power_supply.h
@@ -118,6 +118,7 @@ enum power_supply_property {
 	POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX,
 	POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT,
 	POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT_MAX,
+	POWER_SUPPLY_PROP_INLMT,
 	POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
 	POWER_SUPPLY_PROP_ENERGY_EMPTY_DESIGN,
 	POWER_SUPPLY_PROP_ENERGY_FULL,
@@ -129,6 +130,8 @@ enum power_supply_property {
 	POWER_SUPPLY_PROP_CAPACITY_ALERT_MAX, /* in percents! */
 	POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 	POWER_SUPPLY_PROP_TEMP,
+	POWER_SUPPLY_PROP_MAX_TEMP,
+	POWER_SUPPLY_PROP_MIN_TEMP,
 	POWER_SUPPLY_PROP_TEMP_ALERT_MIN,
 	POWER_SUPPLY_PROP_TEMP_ALERT_MAX,
 	POWER_SUPPLY_PROP_TEMP_AMBIENT,
@@ -140,6 +143,11 @@ enum power_supply_property {
 	POWER_SUPPLY_PROP_TIME_TO_FULL_AVG,
 	POWER_SUPPLY_PROP_TYPE, /* use power_supply.type instead */
 	POWER_SUPPLY_PROP_SCOPE,
+	POWER_SUPPLY_PROP_CHARGE_TERM_CUR,
+	POWER_SUPPLY_PROP_ENABLE_CHARGING,
+	POWER_SUPPLY_PROP_ENABLE_CHARGER,
+	POWER_SUPPLY_PROP_CABLE_TYPE,
+	POWER_SUPPLY_PROP_PRIORITY,
 	/* Properties of type `const char *' */
 	POWER_SUPPLY_PROP_MODEL_NAME,
 	POWER_SUPPLY_PROP_MANUFACTURER,
-- 
1.7.9.5