1 files changed, 37 insertions, 22 deletions

diff --git a/drivers/acpi/battery.c b/drivers/acpi/battery.c
index ac74a7ddaaa4..95649d373071 100644
--- a/drivers/acpi/battery.c
+++ b/drivers/acpi/battery.c
@@ -42,10 +42,7 @@
 
 #include <acpi/acpi_bus.h>
 #include <acpi/acpi_drivers.h>
-
-#ifdef CONFIG_ACPI_SYSFS_POWER
 #include <linux/power_supply.h>
-#endif
 
 #define PREFIX "ACPI: "
 
@@ -98,13 +95,12 @@ enum {
          * due to bad math.
          */
         ACPI_BATTERY_QUIRK_SIGNED16_CURRENT,
+        ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY,
 };
 
 struct acpi_battery {
         struct mutex lock;
-#ifdef CONFIG_ACPI_SYSFS_POWER
         struct power_supply bat;
-#endif
         struct acpi_device *device;
         unsigned long update_time;
         int rate_now;
@@ -141,7 +137,6 @@ inline int acpi_battery_present(struct acpi_battery *battery)
         return battery->device->status.battery_present;
 }
 
-#ifdef CONFIG_ACPI_SYSFS_POWER
 static int acpi_battery_technology(struct acpi_battery *battery)
 {
         if (!strcasecmp("NiCd", battery->type))
@@ -300,7 +295,6 @@ static enum power_supply_property energy_battery_props[] = {
         POWER_SUPPLY_PROP_MANUFACTURER,
         POWER_SUPPLY_PROP_SERIAL_NUMBER,
 };
-#endif
 
 #ifdef CONFIG_ACPI_PROCFS_POWER
 inline char *acpi_battery_units(struct acpi_battery *battery)
@@ -431,6 +425,8 @@ static int acpi_battery_get_info(struct acpi_battery *battery)
                 result = extract_package(battery, buffer.pointer,
                                 info_offsets, ARRAY_SIZE(info_offsets));
         kfree(buffer.pointer);
+        if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
+                battery->full_charge_capacity = battery->design_capacity;
         return result;
 }
 
@@ -467,6 +463,10 @@ static int acpi_battery_get_state(struct acpi_battery *battery)
             battery->rate_now != -1)
                 battery->rate_now = abs((s16)battery->rate_now);
 
+        if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags)
+            && battery->capacity_now >= 0 && battery->capacity_now <= 100)
+                battery->capacity_now = (battery->capacity_now *
+                                battery->full_charge_capacity) / 100;
         return result;
 }
 
@@ -511,7 +511,6 @@ static int acpi_battery_init_alarm(struct acpi_battery *battery)
         return acpi_battery_set_alarm(battery);
 }
 
-#ifdef CONFIG_ACPI_SYSFS_POWER
 static ssize_t acpi_battery_alarm_show(struct device *dev,
                                         struct device_attribute *attr,
                                         char *buf)
@@ -571,7 +570,6 @@ static void sysfs_remove_battery(struct acpi_battery *battery)
         power_supply_unregister(&battery->bat);
         battery->bat.dev = NULL;
 }
-#endif
 
 static void acpi_battery_quirks(struct acpi_battery *battery)
 {
@@ -580,6 +578,33 @@ static void acpi_battery_quirks(struct acpi_battery *battery)
         }
 }
 
+/*
+ * According to the ACPI spec, some kinds of primary batteries can
+ * report percentage battery remaining capacity directly to OS.
+ * In this case, it reports the Last Full Charged Capacity == 100
+ * and BatteryPresentRate == 0xFFFFFFFF.
+ *
+ * Now we found some battery reports percentage remaining capacity
+ * even if it's rechargeable.
+ * https://bugzilla.kernel.org/show_bug.cgi?id=15979
+ *
+ * Handle this correctly so that they won't break userspace.
+ */
+static void acpi_battery_quirks2(struct acpi_battery *battery)
+{
+        if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
+                return ;
+
+        if (battery->full_charge_capacity == 100 &&
+            battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN &&
+            battery->capacity_now >=0 && battery->capacity_now <= 100) {
+                set_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags);
+                battery->full_charge_capacity = battery->design_capacity;
+                battery->capacity_now = (battery->capacity_now *
+                                battery->full_charge_capacity) / 100;
+        }
+}
+
 static int acpi_battery_update(struct acpi_battery *battery)
 {
         int result, old_present = acpi_battery_present(battery);
@@ -587,9 +612,7 @@ static int acpi_battery_update(struct acpi_battery *battery)
         if (result)
                 return result;
         if (!acpi_battery_present(battery)) {
-#ifdef CONFIG_ACPI_SYSFS_POWER
                 sysfs_remove_battery(battery);
-#endif
                 battery->update_time = 0;
                 return 0;
         }
@@ -601,11 +624,11 @@ static int acpi_battery_update(struct acpi_battery *battery)
                 acpi_battery_quirks(battery);
                 acpi_battery_init_alarm(battery);
         }
-#ifdef CONFIG_ACPI_SYSFS_POWER
         if (!battery->bat.dev)
                 sysfs_add_battery(battery);
-#endif
-        return acpi_battery_get_state(battery);
+        result = acpi_battery_get_state(battery);
+        acpi_battery_quirks2(battery);
+        return result;
 }
 
 /* --------------------------------------------------------------------------
@@ -886,26 +909,20 @@ static void acpi_battery_remove_fs(struct acpi_device *device)
 static void acpi_battery_notify(struct acpi_device *device, u32 event)
 {
         struct acpi_battery *battery = acpi_driver_data(device);
-#ifdef CONFIG_ACPI_SYSFS_POWER
         struct device *old;
-#endif
 
         if (!battery)
                 return;
-#ifdef CONFIG_ACPI_SYSFS_POWER
         old = battery->bat.dev;
-#endif
         acpi_battery_update(battery);
         acpi_bus_generate_proc_event(device, event,
                                      acpi_battery_present(battery));
         acpi_bus_generate_netlink_event(device->pnp.device_class,
                                         dev_name(&device->dev), event,
                                         acpi_battery_present(battery));
-#ifdef CONFIG_ACPI_SYSFS_POWER
         /* acpi_battery_update could remove power_supply object */
         if (old && battery->bat.dev)
                 power_supply_changed(&battery->bat);
-#endif
 }
 
 static int acpi_battery_add(struct acpi_device *device)
@@ -953,9 +970,7 @@ static int acpi_battery_remove(struct acpi_device *device, int type)
 #ifdef CONFIG_ACPI_PROCFS_POWER
         acpi_battery_remove_fs(device);
 #endif
-#ifdef CONFIG_ACPI_SYSFS_POWER
         sysfs_remove_battery(battery);
-#endif
         mutex_destroy(&battery->lock);
         kfree(battery);
         return 0;