ACPI / battery: introduce support for POWER_SUPPLY_PROP_CAPACITY_LEVEL

ACPI battery device receives notifications when
1. the remaining battery capacity becomes critical low
2. the trip point set by the _BTP (Design capacity of Warning by default)
   is reached or crossed.

So it is able to support POWER_SUPPLY_PROP_CAPACITY_LEVEL to report
        POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL,
        POWER_SUPPLY_CAPACITY_LEVEL_LOW,
        POWER_SUPPLY_CAPACITY_LEVEL_NORMAL,
        POWER_SUPPLY_CAPACITY_LEVEL_FULL,
capacity levels to power supply core and user space.

Introduce support for POWER_SUPPLY_PROP_CAPACITY_LEVEL in this patch.

Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/acpi/battery.c b/drivers/acpi/battery.c
index 3b4921e..11285e7 100644 (file)
--- a/drivers/acpi/battery.c
+++ b/drivers/acpi/battery.c
@@ -56,6 +56,10 @@
 /* Battery power unit: 0 means mW, 1 means mA */
 #define ACPI_BATTERY_POWER_UNIT_MA     1
 
+#define ACPI_BATTERY_STATE_DISCHARGING 0x1
+#define ACPI_BATTERY_STATE_CHARGING    0x2
+#define ACPI_BATTERY_STATE_CRITICAL    0x4
+
 #define _COMPONENT             ACPI_BATTERY_COMPONENT
 
 ACPI_MODULE_NAME("battery");
@@ -169,7 +173,7 @@ static int acpi_battery_get_state(struct acpi_battery *battery);
 
 static int acpi_battery_is_charged(struct acpi_battery *battery)
 {
-       /* either charging or discharging */
+       /* charging, discharging or critical low */
        if (battery->state != 0)
                return 0;
 
@@ -204,9 +208,9 @@ static int acpi_battery_get_property(struct power_supply *psy,
                return -ENODEV;
        switch (psp) {
        case POWER_SUPPLY_PROP_STATUS:
-               if (battery->state & 0x01)
+               if (battery->state & ACPI_BATTERY_STATE_DISCHARGING)
                        val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
-               else if (battery->state & 0x02)
+               else if (battery->state & ACPI_BATTERY_STATE_CHARGING)
                        val->intval = POWER_SUPPLY_STATUS_CHARGING;
                else if (acpi_battery_is_charged(battery))
                        val->intval = POWER_SUPPLY_STATUS_FULL;
@@ -269,6 +273,17 @@ static int acpi_battery_get_property(struct power_supply *psy,
                else
                        val->intval = 0;
                break;
+       case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
+               if (battery->state & ACPI_BATTERY_STATE_CRITICAL)
+                       val->intval = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
+               else if (test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags) &&
+                       (battery->capacity_now <= battery->alarm))
+                       val->intval = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
+               else if (acpi_battery_is_charged(battery))
+                       val->intval = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
+               else
+                       val->intval = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
+               break;
        case POWER_SUPPLY_PROP_MODEL_NAME:
                val->strval = battery->model_number;
                break;
@@ -296,6 +311,7 @@ static enum power_supply_property charge_battery_props[] = {
        POWER_SUPPLY_PROP_CHARGE_FULL,
        POWER_SUPPLY_PROP_CHARGE_NOW,
        POWER_SUPPLY_PROP_CAPACITY,
+       POWER_SUPPLY_PROP_CAPACITY_LEVEL,
        POWER_SUPPLY_PROP_MODEL_NAME,
        POWER_SUPPLY_PROP_MANUFACTURER,
        POWER_SUPPLY_PROP_SERIAL_NUMBER,
@@ -313,6 +329,7 @@ static enum power_supply_property energy_battery_props[] = {
        POWER_SUPPLY_PROP_ENERGY_FULL,
        POWER_SUPPLY_PROP_ENERGY_NOW,
        POWER_SUPPLY_PROP_CAPACITY,
+       POWER_SUPPLY_PROP_CAPACITY_LEVEL,
        POWER_SUPPLY_PROP_MODEL_NAME,
        POWER_SUPPLY_PROP_MANUFACTURER,
        POWER_SUPPLY_PROP_SERIAL_NUMBER,