From 90d8edafaa3a0756df8773f2a320ebfc23a7d8e3 Mon Sep 17 00:00:00 2001 From: Benjamin Barenblat Date: Wed, 1 Jun 2016 22:14:18 -0400 Subject: Initial commit Create a basic but functional power manager, as well as a systemd unit file. --- src/Pandora.hs | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 51 insertions(+) create mode 100644 src/Pandora.hs (limited to 'src/Pandora.hs') diff --git a/src/Pandora.hs b/src/Pandora.hs new file mode 100644 index 0000000..f8ea754 --- /dev/null +++ b/src/Pandora.hs @@ -0,0 +1,51 @@ +-- 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" -- cgit v1.2.3