xmonad-config/lib/XMonad/Internal/DBus/Brightness/IntelBacklight.hs

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--------------------------------------------------------------------------------
-- | DBus module for Intel Backlight control
module XMonad.Internal.DBus.Brightness.IntelBacklight
( callGetBrightnessIB
, matchSignalIB
, exportIntelBacklight
, intelBacklightControls
, intelBacklightSignalDep
, blPath
) where
import Data.Int (Int32)
import DBus
import DBus.Client
import System.FilePath.Posix
import XMonad.Internal.DBus.Brightness.Common
import XMonad.Internal.Dependency
import XMonad.Internal.IO
--------------------------------------------------------------------------------
-- | Low level sysfs functions
--
type Brightness = Float
type RawBrightness = Int32
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type RawBounds = (RawBrightness, RawBrightness)
steps :: Int
steps = 16
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minRawBrightness :: RawBrightness
minRawBrightness = 1
backlightDir :: FilePath
backlightDir = "/sys/class/backlight/intel_backlight/"
maxFile :: FilePath
maxFile = backlightDir </> "max_brightness"
curFile :: FilePath
curFile = backlightDir </> "brightness"
getMaxRawBrightness :: IO RawBrightness
getMaxRawBrightness = readInt maxFile
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getBrightness :: RawBounds -> IO Brightness
getBrightness bounds = readPercent bounds curFile
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minBrightness :: RawBounds -> IO Brightness
minBrightness bounds = writePercentMin bounds curFile
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maxBrightness :: RawBounds -> IO Brightness
maxBrightness bounds = writePercentMax bounds curFile
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incBrightness :: RawBounds -> IO Brightness
incBrightness = incPercent steps curFile
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decBrightness :: RawBounds -> IO Brightness
decBrightness = decPercent steps curFile
--------------------------------------------------------------------------------
-- | DBus interface
blPath :: ObjectPath
blPath = objectPath_ "/intelbacklight"
interface :: InterfaceName
interface = interfaceName_ "org.xmonad.Brightness"
intelBacklightConfig :: BrightnessConfig RawBrightness Brightness
intelBacklightConfig = BrightnessConfig
{ bcMin = minBrightness
, bcMax = maxBrightness
, bcInc = incBrightness
, bcDec = decBrightness
, bcGet = getBrightness
, bcGetMax = getMaxRawBrightness
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, bcMinRaw = minRawBrightness
, bcPath = blPath
, bcInterface = interface
, bcName = "Intel backlight"
}
--------------------------------------------------------------------------------
-- | Exported haskell API
curFileDep :: IODependency_
curFileDep = pathRW curFile
maxFileDep :: IODependency_
maxFileDep = pathR maxFile
intelBacklightSignalDep :: DBusDependency_
intelBacklightSignalDep = signalDep intelBacklightConfig
exportIntelBacklight :: Maybe Client -> SometimesIO
exportIntelBacklight = brightnessExporter xpfIntelBacklight
[curFileDep, maxFileDep] intelBacklightConfig
intelBacklightControls :: Maybe Client -> BrightnessControls
intelBacklightControls = brightnessControls xpfIntelBacklight intelBacklightConfig
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callGetBrightnessIB :: Client -> IO (Maybe Brightness)
callGetBrightnessIB = callGetBrightness intelBacklightConfig
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matchSignalIB :: (Maybe Brightness -> IO ()) -> Client -> IO ()
matchSignalIB = matchSignal intelBacklightConfig