widgets/contrib/tpbat/smapi.lua

   1
   2 --[[
   3
   4      smapi.lua
   5      Interface with thinkpad battery information
   6
   7      Licensed under GNU General Public License v2
   8       * (c) 2013, Conor Heine
   9
  10 --]]
  11
  12 local first_line   = require("lain.helpers").first_line
  13
  14 local string       = { format = string.format }
  15 local tonumber     = tonumber
  16 local setmetatable = setmetatable
  17
  18 local smapi = {}
  19
  20 local apipath = "/sys/devices/platform/smapi"
  21
  22 -- Most are readable values, but some can be written to (not implemented, yet?)
  23 local readable = {
  24     barcoding                  = true,
  25     charging_max_current       = true,
  26     charging_max_voltage       = true,
  27     chemistry                  = true,
  28     current_avg                = true,
  29     current_now                = true,
  30     cycle_count                = true,
  31     design_capacity            = true,
  32     design_voltage             = true,
  33     dump                       = true,
  34     first_use_date             = true,
  35     force_discharge            = false,
  36     group0_voltage             = true,
  37     group1_voltage             = true,
  38     group2_voltage             = true,
  39     group3_voltage             = true,
  40     inhibit_charge_minutes     = false,
  41     installed                  = true,
  42     last_full_capacity         = true,
  43     manufacture_date           = true,
  44     manufacturer               = true,
  45     model                      = true,
  46     power_avg                  = true,
  47     power_now                  = true,
  48     remaining_capacity         = true,
  49     remaining_charging_time    = true,
  50     remaining_percent          = true,
  51     remaining_percent_error    = true,
  52     remaining_running_time     = true,
  53     remaining_running_time_now = true,
  54     serial                     = true,
  55     start_charge_thresh        = false,
  56     state                      = true,
  57     stop_charge_thresh         = false,
  58     temperature                = true,
  59     voltage                    = true,
  60 }
  61
  62 function smapi:battery(name)
  63     local bat = {}
  64
  65     bat.name = name
  66     bat.path = apipath .. "/" .. name
  67
  68     function bat:get(item)
  69         return self.path ~= nil and readable[item] and first_line(self.path .. "/" .. item) or nil
  70     end
  71
  72     function bat:installed()
  73         return self:get("installed") == "1"
  74     end
  75
  76     function bat:status()
  77         return self:get('state')
  78     end
  79
  80     -- Remaining time can either be time until battery dies or time until charging completes
  81     function bat:remaining_time()
  82         local time_val = bat_now.status == 'discharging' and 'remaining_running_time' or 'remaining_charging_time'
  83         local mins_left = self:get(time_val)
  84
  85         if mins_left:find("^%d+") == nil
  86         then
  87             return "N/A"
  88         end
  89
  90         local hrs = mins_left / 60
  91         local min = mins_left % 60
  92         return string.format("%02d:%02d", hrs, min)
  93     end
  94
  95     function bat:percent()
  96         return tonumber(self:get("remaining_percent"))
  97     end
  98
  99     return setmetatable(bat, {__metatable = false, __newindex = false})
 100 end
 101
 102 return smapi