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[etc/awesome.git] / 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 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 mins_left:find("^%d+") == nil
85         then
86             return "N/A"
87         end
88
89         local hrs = math.floor(mins_left / 60)
90         local min = mins_left % 60
91         return string.format("%02d:%02d", hrs, min)
92     end
93
94     function bat:percent()
95         return tonumber(self:get("remaining_percent"))
96     end
97
98     return setmetatable(bat, {__metatable = false, __newindex = false})
99 end
100
101 return smapi