127 lines
3.6 KiB
Haskell
127 lines
3.6 KiB
Haskell
--------------------------------------------------------------------------------
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-- | DBus module for Intel Backlight control
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module XMonad.Internal.DBus.Brightness.IntelBacklight
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( callGetBrightnessIB
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, matchSignalIB
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, exportIntelBacklight
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, hasBacklight
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, blPath
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) where
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import Data.Either
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import Data.Int (Int32)
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import DBus
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import DBus.Client
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import System.FilePath.Posix
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import XMonad.Internal.DBus.Brightness.Common
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import XMonad.Internal.IO
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--------------------------------------------------------------------------------
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-- | Low level sysfs functions
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--
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type Brightness = Float
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type RawBrightness = Int32
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steps :: Int
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steps = 16
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backlightDir :: FilePath
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backlightDir = "/sys/class/backlight/intel_backlight/"
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maxFile :: FilePath
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maxFile = backlightDir </> "max_brightness"
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curFile :: FilePath
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curFile = backlightDir </> "brightness"
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getMaxRawBrightness :: IO RawBrightness
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getMaxRawBrightness = readInt maxFile
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getBrightness :: RawBrightness -> IO Brightness
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getBrightness upper = readPercent upper curFile
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minBrightness :: RawBrightness -> IO Brightness
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minBrightness upper = writePercentMin upper curFile
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maxBrightness :: RawBrightness -> IO Brightness
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maxBrightness upper = writePercentMax upper curFile
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incBrightness :: RawBrightness -> IO Brightness
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incBrightness = incPercent steps curFile
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decBrightness :: RawBrightness -> IO Brightness
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decBrightness = decPercent steps curFile
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--------------------------------------------------------------------------------
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-- | Access checks
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-- | determine if backlight is accessible/present
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-- Right True -> backlight accessible and present
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-- Right False -> backlight not present
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-- Left x -> backlight present but could not access (x explaining why)
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hasBacklight' :: IO (Either String Bool)
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hasBacklight' = do
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mx <- isReadable maxFile
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cx <- isWritable curFile
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return $ case (mx, cx) of
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(NotFoundError, NotFoundError) -> Right False
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(PermResult True, PermResult True) -> Right True
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(PermResult _, PermResult _) -> Left "Insufficient permissions for backlight files"
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_ -> Left "Could not determine permissions for backlight files"
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msg :: Either String Bool -> IO ()
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msg (Right True) = return ()
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msg (Right False) = putStrLn "No backlight detected. Controls disabled"
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msg (Left m) = putStrLn $ "WARNING: " ++ m
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hasBacklightMsg :: IO Bool
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hasBacklightMsg = do
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b <- hasBacklight'
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msg b
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return $ fromRight False b
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hasBacklight :: IO Bool
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hasBacklight = fromRight False <$> hasBacklight'
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--------------------------------------------------------------------------------
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-- | DBus interface
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blPath :: ObjectPath
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blPath = objectPath_ "/intelbacklight"
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interface :: InterfaceName
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interface = interfaceName_ "org.xmonad.Brightness"
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intelBacklightConfig :: BrightnessConfig RawBrightness Brightness
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intelBacklightConfig = BrightnessConfig
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{ bcMin = minBrightness
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, bcMax = maxBrightness
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, bcInc = incBrightness
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, bcDec = decBrightness
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, bcGet = getBrightness
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, bcGetMax = getMaxRawBrightness
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, bcPath = blPath
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, bcInterface = interface
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}
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--------------------------------------------------------------------------------
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-- | Exported haskell API
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exportIntelBacklight :: Client -> IO (Maybe BrightnessControls)
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exportIntelBacklight client = do
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b <- hasBacklightMsg
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if b
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then Just <$> exportBrightnessControls intelBacklightConfig client
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else return Nothing
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callGetBrightnessIB :: IO (Maybe Brightness)
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callGetBrightnessIB = callGetBrightness intelBacklightConfig
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matchSignalIB :: (Maybe Brightness -> IO ()) -> IO SignalHandler
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matchSignalIB = matchSignal intelBacklightConfig
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