widget/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 local apipath = "/sys/devices/platform/smapi"
  20
  21 -- Most are readable values, but some can be written to (not implemented, yet?)
  22 local readable = {
  23     barcoding                  = true,
  24     charging_max_current       = true,
  25     charging_max_voltage       = true,
  26     chemistry                  = true,
  27     current_avg                = true,
  28     current_now                = true,
  29     cycle_count                = true,
  30     design_capacity            = true,
  31     design_voltage             = true,
  32     dump                       = true,
  33     first_use_date             = true,
  34     force_discharge            = false,
  35     group0_voltage             = true,
  36     group1_voltage             = true,
  37     group2_voltage             = true,
  38     group3_voltage             = true,
  39     inhibit_charge_minutes     = false,
  40     installed                  = true,
  41     last_full_capacity         = true,
  42     manufacture_date           = true,
  43     manufacturer               = true,
  44     model                      = true,
  45     power_avg                  = true,
  46     power_now                  = true,
  47     remaining_capacity         = true,
  48     remaining_charging_time    = true,
  49     remaining_percent          = true,
  50     remaining_percent_error    = true,
  51     remaining_running_time     = true,
  52     remaining_running_time_now = true,
  53     serial                     = true,
  54     start_charge_thresh        = false,
  55     state                      = true,
  56     stop_charge_thresh         = false,
  57     temperature                = true,
  58     voltage                    = true,
  59 }
  60
  61 function smapi:battery(name)
  62     local bat = {}
  63
  64     bat.name = name
  65     bat.path = apipath .. "/" .. name
  66
  67     function bat:get(item)
  68         return self.path ~= nil and readable[item] and first_line(self.path .. "/" .. item) or nil
  69     end
  70
  71     function bat:installed()
  72         return self:get("installed") == "1"
  73     end
  74
  75     function bat:status()
  76         return self:get('state')
  77     end
  78
  79     -- Remaining time can either be time until battery dies or time until charging completes
  80     function bat:remaining_time()
  81         local time_val = bat_now.status == 'discharging' and 'remaining_running_time' or 'remaining_charging_time'
  82         local mins_left = self:get(time_val)
  83
  84         if not mins_left:find("^%d+") then return "N/A" end
  85
  86         local hrs = math.floor(mins_left / 60)
  87         local min = mins_left % 60
  88
  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