src/power.vala

   1 /*
   2  * power - zavai power event handling
   3  *
   4  * Copyright (C) 2009  Enrico Zini <enrico@enricozini.org>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 using GLib;
  22
  23 namespace zavai {
  24 namespace power {
  25
  26 class Power : Service
  27 {
  28     public enum State
  29     {
  30         UNKNOWN,
  31         CHARGING,
  32         DISCHARGING,
  33         FULLY_CHARGED,
  34     }
  35
  36     protected string battery_device;
  37     protected uint timeout;
  38     public signal void changed();
  39     public State state;
  40     public int percentage;
  41
  42     public Power()
  43     {
  44         battery_device = "";
  45         timeout = 0;
  46         state = State.UNKNOWN;
  47         percentage = 0;
  48     }
  49
  50     /// Activate the service
  51     protected override void start()
  52     {
  53         if (started) return;
  54
  55         uint poll_time;
  56         if (uevent.uevent != null)
  57         {
  58             uevent.uevent.event += on_uevent;
  59             uevent.uevent.request("zavai.power");
  60             // If we can get plug/unplug notifications, it's ok to just poll
  61             // every 5 minutes
  62             poll_time = 300 * 1000;
  63         } else {
  64             // Else poll every 30 seconds to be somehow reactive to plug/unplug
  65             // events
  66             poll_time = 30 * 1000;
  67         }
  68
  69         // Poll battery every minute
  70         timeout = Timeout.add(poll_time, on_timeout);
  71
  72         base.start();
  73     }
  74
  75     /// Deactivate the service
  76     protected override void stop()
  77     {
  78         if (!started) return;
  79
  80         // Stop polling
  81         Source.remove(timeout);
  82
  83         if (uevent.uevent != null)
  84         {
  85             uevent.uevent.release("zavai.power");
  86             uevent.uevent.event -= on_uevent;
  87         }
  88
  89         base.stop();
  90     }
  91
  92     bool on_timeout()
  93     {
  94         changed();
  95         return true;
  96     }
  97
  98     void on_uevent()
  99     {
 100         /* if (uevent.uevent.event_data.buffer.has_prefix("change@/class/power_supply/ac"))
 101         {
 102             changed();
 103         }
 104         else */
 105         if (uevent.uevent.event_data.buffer.has_prefix("change@/class/power_supply/battery"))
 106         {
 107             State new_state = State.UNKNOWN;
 108             int new_percentage = 0;
 109
 110             Omhacks.UEvent.parse(ref uevent.uevent.event_data);
 111             for (int i = 0; uevent.uevent.event_data.envp[i] != null; ++i)
 112             {
 113                 if (uevent.uevent.event_data.envp[i].has_prefix("POWER_SUPPLY_STATUS="))
 114                 {
 115                     var val = uevent.uevent.event_data.envp[i].offset(20);
 116                     if (val == "Charging")
 117                         new_state = State.CHARGING;
 118                     else if (val == "Discharging")
 119                         new_state = State.DISCHARGING;
 120                     else if (val == "Not charging")
 121                         new_state = State.FULLY_CHARGED;
 122                     else
 123                         zavai.log.warning("Unknown state: " + uevent.uevent.event_data.envp[i]);
 124                 }
 125                 else if (uevent.uevent.event_data.envp[i].has_prefix("POWER_SUPPLY_CAPACITY="))
 126                 {
 127                     new_percentage = uevent.uevent.event_data.envp[i].offset(22).to_int();
 128                 }
 129             }
 130             if (new_state != state || new_percentage != percentage)
 131             {
 132                 state = new_state;
 133                 percentage = new_percentage;
 134                 changed();
 135             }
 136         }
 137     }
 138 }
 139
 140 Power power;
 141
 142 public void init()
 143 {
 144     power = new Power();
 145 }
 146
 147 }
 148 }