widgets/contrib/tpbat/smapi.lua

   1 --[[
   2      smapi.lua
   3      Interface with thinkpad battery information
   4
   5      Licensed under GNU General Public License v2
   6       * (c) 2013,      Conor Heine
   7
   8 --]]
   9
  10 local first_line   = require("lain.helpers").first_line
  11
  12 local string       = { format = string.format }
  13 local tonumber     = tonumber
  14 local setmetatable = setmetatable
  15
  16 local smapi = {}
  17
  18 local apipath = "/sys/devices/platform/smapi"
  19
  20 -- Most are readable values, but some can be written to (not implemented, yet?)
  21 local readable = {
  22         barcoding = true,
  23         charging_max_current = true,
  24         charging_max_voltage = true,
  25         chemistry = true,
  26         current_avg = true,
  27         current_now = true,
  28         cycle_count = true,
  29         design_capacity = true,
  30         design_voltage = true,
  31         dump = true,
  32         first_use_date = true,
  33         force_discharge = false,
  34         group0_voltage = true,
  35         group1_voltage = true,
  36         group2_voltage = true,
  37         group3_voltage = true,
  38         inhibit_charge_minutes = false,
  39         installed = true,
  40         last_full_capacity = true,
  41         manufacture_date = true,
  42         manufacturer = true,
  43         model = true,
  44         power_avg = true,
  45         power_now = true,
  46         remaining_capacity = true,
  47         remaining_charging_time = true,
  48         remaining_percent = true,
  49         remaining_percent_error = true,
  50         remaining_running_time = true,
  51         remaining_running_time_now = true,
  52         serial = true,
  53         start_charge_thresh = false,
  54         state = true,
  55         stop_charge_thresh = false,
  56         temperature = true,
  57         voltage = true,
  58 }
  59
  60 function smapi:battery(name)
  61         local bat = {}
  62
  63         bat.name = name
  64         bat.path = apipath .. "/" .. name
  65
  66         function bat:get(item)
  67                 return self.path ~= nil and readable[item] and first_line(self.path .. "/" .. item) or nil
  68         end
  69
  70         function bat:installed()
  71                 return self:get("installed") == "1"
  72         end
  73
  74         function bat:status()
  75                 return self:get('state')
  76         end
  77
  78         -- Remaining time can either be time until battery dies or time until charging completes
  79         function bat:remaining_time()
  80                 local time_val = bat_now.status == 'discharging' and 'remaining_running_time' or 'remaining_charging_time'
  81                 local mins_left = self:get(time_val)
  82
  83                 if mins_left:find("^%d+") == nil then
  84                         return "N/A"
  85                 end
  86
  87                 local hrs = mins_left / 60
  88                 local min = mins_left % 60
  89                 return string.format("%02d:%02d", hrs, min)
  90         end
  91
  92         function bat:percent()
  93                 return tonumber(self:get("remaining_percent"))
  94         end
  95
  96         return setmetatable(bat, {__metatable = false, __newindex = false})
  97 end
  98
  99 return smapi