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--[[
smapi.lua
Interface with thinkpad battery information
Licensed under GNU General Public License v2
* (c) 2013, Conor Heine
--]]
local first_line = require("lain.helpers").first_line
local string = { format = string.format }
local tonumber = tonumber
local setmetatable = setmetatable
local smapi = {}
local apipath = "/sys/devices/platform/smapi"
-- Most are readable values, but some can be written to (not implemented, yet?)
local readable = {
barcoding = true,
charging_max_current = true,
charging_max_voltage = true,
chemistry = true,
current_avg = true,
current_now = true,
cycle_count = true,
design_capacity = true,
design_voltage = true,
dump = true,
first_use_date = true,
force_discharge = false,
group0_voltage = true,
group1_voltage = true,
group2_voltage = true,
group3_voltage = true,
inhibit_charge_minutes = false,
installed = true,
last_full_capacity = true,
manufacture_date = true,
manufacturer = true,
model = true,
power_avg = true,
power_now = true,
remaining_capacity = true,
remaining_charging_time = true,
remaining_percent = true,
remaining_percent_error = true,
remaining_running_time = true,
remaining_running_time_now = true,
serial = true,
start_charge_thresh = false,
state = true,
stop_charge_thresh = false,
temperature = true,
voltage = true,
}
function smapi:battery(name)
local bat = {}
bat.name = name
bat.path = apipath .. "/" .. name
function bat:get(item)
return self.path ~= nil and readable[item] and first_line(self.path .. "/" .. item) or nil
end
function bat:installed()
return self:get("installed") == "1"
end
function bat:status()
return self:get('state')
end
-- Remaining time can either be time until battery dies or time until charging completes
function bat:remaining_time()
local time_val = bat_now.status == 'discharging' and 'remaining_running_time' or 'remaining_charging_time'
local mins_left = self:get(time_val)
if mins_left:find("^%d+") == nil
then
return "N/A"
end
local hrs = mins_left / 60
local min = mins_left % 60
return string.format("%02d:%02d", hrs, min)
end
function bat:percent()
return tonumber(self:get("remaining_percent"))
end
return setmetatable(bat, {__metatable = false, __newindex = false})
end
return smapi
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