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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
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 = math.floor(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