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|
{-# LANGUAGE CPP #-}
{-# LANGUAGE ForeignFunctionInterface #-}
-- This module provides C bindings to the `gpiod` library for direct GPIO pin
-- control. It includes bindings only for the C functions that are currently
-- used. In the future, creating a complete set of bindings for the entire
-- `gpiod` library as an external package would be a valuable contribution to
-- Hackage.
module Hsm.GPIO.Lib
( chipOpen
, chipClose
, input
, output
, LineValue
, active
, inactive
, lineSettingsNew
, lineSettingsFree
, lineSettingsSetDirection
, lineSettingsSetOutputValue
, lineConfigNew
, lineConfigFree
, lineConfigAddLineSettings
, requestConfigNew
, requestConfigFree
, requestConfigSetConsumer
, requestLines
, LineRequest
, lineRequestRelease
, lineRequestSetValue
, lineRequestSetValues
) where
#include <gpiod.h>
import Foreign.C.String (CString)
import Foreign.C.Types (CInt(CInt), CSize(CSize), CUInt(CUInt))
import Foreign.Ptr (Ptr)
import Foreign.Storable (Storable)
data Chip
foreign import ccall unsafe "gpiod.h gpiod_chip_open"
chipOpen :: CString -> IO (Ptr Chip)
foreign import ccall unsafe "gpiod.h gpiod_chip_close"
chipClose :: Ptr Chip -> IO ()
data LineSettings
newtype LineDirection =
LineDirection CInt
deriving (Show)
#{enum LineDirection, LineDirection
, input = GPIOD_LINE_DIRECTION_INPUT
, output = GPIOD_LINE_DIRECTION_OUTPUT
}
newtype LineValue =
LineValue CInt
deriving (Show, Storable)
#{enum LineValue, LineValue
, active = GPIOD_LINE_VALUE_ACTIVE
, inactive = GPIOD_LINE_VALUE_INACTIVE
}
foreign import ccall unsafe "gpiod.h gpiod_line_settings_new"
lineSettingsNew :: IO (Ptr LineSettings)
foreign import ccall unsafe "gpiod.h gpiod_line_settings_free"
lineSettingsFree :: Ptr LineSettings -> IO ()
foreign import ccall unsafe "gpiod.h gpiod_line_settings_set_direction"
lineSettingsSetDirection :: Ptr LineSettings -> LineDirection -> IO CInt
foreign import ccall unsafe "gpiod.h gpiod_line_settings_set_output_value"
lineSettingsSetOutputValue :: Ptr LineSettings -> LineValue -> IO CInt
data LineConfig
foreign import ccall unsafe "gpiod.h gpiod_line_config_new"
lineConfigNew :: IO (Ptr LineConfig)
foreign import ccall unsafe "gpiod.h gpiod_line_config_free"
lineConfigFree :: Ptr LineConfig -> IO ()
foreign import ccall unsafe "gpiod.d gpiod_line_config_add_line_settings"
lineConfigAddLineSettings :: Ptr LineConfig -> Ptr CUInt -> CSize -> Ptr LineSettings -> IO CInt
data RequestConfig
foreign import ccall unsafe "gpiod.h gpiod_request_config_new"
requestConfigNew :: IO (Ptr RequestConfig)
foreign import ccall unsafe "gpiod.h gpiod_request_config_free"
requestConfigFree :: Ptr RequestConfig -> IO ()
foreign import ccall unsafe "gpiod.h gpiod_request_config_set_consumer"
requestConfigSetConsumer :: Ptr RequestConfig -> CString -> IO ()
data LineRequest
foreign import ccall unsafe "gpiod.h gpiod_chip_request_lines"
requestLines :: Ptr Chip -> Ptr RequestConfig -> Ptr LineConfig -> IO (Ptr LineRequest)
foreign import ccall unsafe "gpiod.h gpiod_line_request_release"
lineRequestRelease :: Ptr LineRequest -> IO ()
foreign import ccall unsafe "gpiod.h gpiod_line_request_set_value"
lineRequestSetValue :: Ptr LineRequest -> CUInt -> LineValue -> IO CInt
foreign import ccall unsafe "gpiod.h gpiod_line_request_set_values"
lineRequestSetValues :: Ptr LineRequest -> Ptr LineValue -> IO CInt
|
