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|
{-# LANGUAGE CApiFFI #-}
-- FFI bindings to `libgpiod` for direct GPIO hardware access.
--
-- Exposes only the minimal required subset of `libgpiod` functionality used by
-- this project. The bindings are suitable for low-level hardware control.
--
-- Future work could expand this into a comprehensive `gpiod` binding package.
module Hsm.GPIO.FFI
( chipOpen
, chipClose
, input
, output
, LineValue
, active
, inactive
, lineSettingsNew
, lineSettingsFree
, lineSettingsSetDirection
, lineSettingsSetOutputValue
, lineConfigNew
, lineConfigFree
, lineConfigAddLineSettings
, requestConfigNew
, requestConfigFree
, requestConfigSetConsumer
, LineRequest
, chipRequestLines
, lineRequestRelease
, lineRequestSetValue
, lineRequestSetValues
) where
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)
foreign import capi unsafe "gpiod.h value GPIOD_LINE_DIRECTION_INPUT" input :: LineDirection
foreign import capi unsafe "gpiod.h value GPIOD_LINE_DIRECTION_OUTPUT" output :: LineDirection
newtype LineValue =
LineValue CInt
deriving (Show, Storable)
foreign import capi unsafe "gpiod.h value GPIOD_LINE_VALUE_ACTIVE" active :: LineValue
foreign import capi unsafe "gpiod.h value GPIOD_LINE_VALUE_INACTIVE" inactive :: LineValue
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.h 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" chipRequestLines :: 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
|
