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path: root/add-battery-upower-support.patch
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=== modified file 'applets/maintained/battery/battery.py'
--- applets/maintained/battery/battery.py	2010-08-12 19:00:37 +0000
+++ applets/maintained/battery/battery.py	2010-09-12 22:24:21 +0000
@@ -1,6 +1,6 @@
 #!/usr/bin/python
 # Copyright (c) 2007 - 2008  Randal Barlow <im.tehk at gmail.com>
-#                      2008 - 2009  onox <denkpadje@gmail.com>
+#               2008 - 2010  onox <denkpadje@gmail.com>
 #
 # This library is free software; you can redistribute it and/or
 # modify it under the terms of the GNU Lesser General Public
@@ -223,11 +223,11 @@
             return
 
         charge_percentage = self.backend.get_capacity_percentage()
-
-        charge_message = "Computer running on %s power" % ("AC", "battery")[self.backend.is_discharging()]
+        power_type = "AC" if self.backend.is_on_ac_power() else "battery"
+        charge_message = "Computer running on %s power" % power_type
 
         if self.backend.is_charged():
-            charge_message += "\nBattery charged"
+            charge_message += "\n" + "Battery charged"
             icon = os.path.join(themes_dir, self.settings["theme"], "battery-charged.svg")
         else:
             is_charging = self.backend.is_charging()
@@ -343,6 +343,148 @@
         return self.get_remaining_capacity() <= self.get_warning_capacity()
 
 
+class UPowerBackend(AbstractBackend):
+
+    """Backend that uses UPower via DBus.
+
+    Reference: http://upower.freedesktop.org/docs/Device.html
+
+    """
+
+    device_iface_name = "org.freedesktop.UPower.Device"
+
+    devices = None
+
+    def __init__(self):
+        self.__system_bus = dbus.SystemBus()
+
+        self.udi = UPowerBackend.get_batteries().keys()[0]
+        self.__set_dbus_interface(self.udi)
+
+    @staticmethod
+    def backend_useable():
+        return dbus is not None and len(UPowerBackend.get_batteries()) > 0
+
+    @staticmethod
+    def get_batteries():
+        udi_models = {}
+
+        try:
+            system_bus = dbus.SystemBus()
+
+            proxy = system_bus.get_object("org.freedesktop.UPower", "/org/freedesktop/UPower")
+            interface = dbus.Interface(proxy, "org.freedesktop.UPower")
+
+            UPowerBackend.devices = list(interface.EnumerateDevices())
+
+            for udi in UPowerBackend.devices:
+                device_iface = UPowerBackend.__get_dbus_interface(system_bus, udi)
+
+                # Type 2 is battery (1 is AC, 3 is UPS)
+                device_type = int(UPowerBackend.__get_property(device_iface, "Type"))
+                is_present = bool(UPowerBackend.__get_property(device_iface, "IsPresent"))
+
+                if device_type == 2 and is_present:
+                    udi_models[str(udi)] = str(UPowerBackend.__get_property(device_iface, "Model"))
+        except dbus.DBusException, e:
+            print e.message
+        finally:
+            return udi_models
+
+    def set_active_udi(self, udi):
+        udi_models = UPowerBackend.get_batteries()
+
+        assert udi in udi_models
+
+        self.udi = udi
+        self.__set_dbus_interface(udi)
+
+    @staticmethod
+    def __get_dbus_interface(system_bus, udi):
+        proxy = system_bus.get_object("org.freedesktop.UPower", udi)
+        return dbus.Interface(proxy, "org.freedesktop.DBus.Properties")
+
+    def __set_dbus_interface(self, udi):
+        self.__battery = UPowerBackend.__get_dbus_interface(self.__system_bus, udi)
+    
+    @staticmethod
+    def __get_property(interface, property_name):
+        return interface.Get(UPowerBackend.device_iface_name, property_name)
+
+    def get_active_udi(self):
+        return self.udi
+
+    def is_present(self):
+        return bool(UPowerBackend.__get_property(self.__battery, "IsPresent"))
+
+    def is_charging(self):
+        # State 1 is charging
+        return int(UPowerBackend.__get_property(self.__battery, "State")) == 1
+
+    def is_discharging(self):
+        # State 2 is discharging
+        return int(UPowerBackend.__get_property(self.__battery, "State")) == 2
+
+    def get_last_full_capacity(self):
+        # Measured in Wh
+        return int(UPowerBackend.__get_property(self.__battery, "EnergyFull"))
+
+    def get_remaining_capacity(self):
+        # Measured in Wh
+        return int(UPowerBackend.__get_property(self.__battery, "Energy"))
+
+    def get_charge_rate(self):
+        # Measured in W. Original value positive if being discharged, negative if being charged
+        return abs(int(UPowerBackend.__get_property(self.__battery, "EnergyRate")))
+
+    def get_capacity_percentage(self):
+        # Percentage in range 0 .. 100
+        return int(UPowerBackend.__get_property(self.__battery, "Percentage"))
+
+    def get_warning_capacity(self):
+        # Measured in Wh
+        return int(int(UPowerBackend.__get_property(self.__battery, "EnergyFullDesign")) * (warning_percentage / 100.))
+
+    def get_charge_time(self):
+        assert self.is_charging()
+
+        # Charge time in seconds
+        time = int(UPowerBackend.__get_property(self.__battery, "TimeToFull"))
+
+        if time == 0:
+            return super(UPowerBackend, self).get_charge_time()
+
+        hours = time / 3600
+        seconds = time % 3600
+        return (hours, int(round(seconds / 60.0)))
+
+    def get_remaining_time(self):
+        assert self.is_discharging()
+
+        # Discharge time in seconds
+        time = int(UPowerBackend.__get_property(self.__battery, "TimeToEmpty"))
+
+        if time == 0:
+            return super(UPowerBackend, self).get_discharge_time()
+
+        hours = time / 3600
+        seconds = time % 3600
+        return (hours, int(round(seconds / 60.0)))
+
+    def is_charged(self):
+        # State 4 is fully charged
+        return int(UPowerBackend.__get_property(self.__battery, "State")) == 4
+
+    def is_on_ac_power(self):
+        for udi in UPowerBackend.devices:
+            device_iface = UPowerBackend.__get_dbus_interface(self.__system_bus, udi)
+
+            # Property "Online" only has a value for AC power device
+            if bool(UPowerBackend.__get_property(device_iface, "Online")):
+                return True
+        return False
+
+
 class HalBackend(AbstractBackend):
 
     """Backend that uses HAL via DBus.
@@ -372,7 +514,7 @@
             return udi_models
         except dbus.DBusException, e:
             print e.message
-            return {}
+            return udi_models
 
     def set_active_udi(self, udi):
         udi_models = HalBackend.get_batteries()
@@ -416,8 +558,12 @@
         except dbus.DBusException:
             return int(int(self.__hal_battery.GetProperty("battery.charge_level.design")) * (warning_percentage / 100.))
 
-
-backends = [HalBackend]
+    def is_on_ac_power(self):
+        # TODO Should check that _all_ batteries are not discharging
+        return not self.is_discharging()
+
+
+backends = [UPowerBackend, HalBackend]
 
 
 if __name__ == "__main__":