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diff --git a/src/Pandora.hs b/src/Pandora.hs
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+-- Copyright 2016 Benjamin Barenblat
+--
+-- Licensed under the Apache License, Version 2.0 (the “License”); you may not
+-- use this file except in compliance with the License.  You may obtain a copy
+-- of the License at
+--
+--     http://www.apache.org/licenses/LICENSE-2.0
+--
+-- Unless required by applicable law or agreed to in writing, software
+-- distributed under the License is distributed on an “AS IS” BASIS, WITHOUT
+-- WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+-- License for the specific language governing permissions and limitations under
+-- the License.
+
+module Pandora
+    ( chargePercent
+    , chargeCurrent
+    , chargingEnabled
+    , setCharging
+    ) where
+
+import Control.Applicative ((<$>))
+import System.FilePath ((</>))
+
+fuelGauge :: String
+fuelGauge = "/sys/class/power_supply/bq27500-0"
+
+acCharger :: String
+acCharger = "/sys/class/power_supply/twl4030_ac"
+
+chargePercent :: IO Int
+chargePercent = read <$> readFile (fuelGauge </> "capacity")
+
+-- | Determines the charge current in microamperes (µA).
+chargeCurrent :: IO Int
+chargeCurrent = read <$> readFile (fuelGauge </> "current_now")
+
+chargingEnabled :: IO Bool
+chargingEnabled = do
+    t <- readFile (acCharger </> "enable")
+    return $ case t of
+        "0\n" -> False
+        "1\n" -> True
+        _ -> error "no parse"
+
+setCharging :: Bool -> IO ()
+setCharging = writeFile (acCharger </> "enable") . showAsInt
+
+showAsInt :: Bool -> String
+showAsInt False = "0"
+showAsInt True  = "1"