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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 capi unsafe "gpiod.h gpiod_chip_open"
chipOpen :: CString -> IO (Ptr Chip)
foreign import capi unsafe "gpiod.h gpiod_chip_close"
chipClose :: Ptr Chip -> IO ()
data LineSettings
newtype LineDirection
= LineDirection CInt
deriving Show
foreign import capi safe "gpiod.h value GPIOD_LINE_DIRECTION_INPUT"
input :: LineDirection
foreign import capi safe "gpiod.h value GPIOD_LINE_DIRECTION_OUTPUT"
output :: LineDirection
newtype LineValue
= LineValue CInt
deriving (Show, Storable)
foreign import capi safe "gpiod.h value GPIOD_LINE_VALUE_ACTIVE"
active :: LineValue
foreign import capi safe "gpiod.h value GPIOD_LINE_VALUE_INACTIVE"
inactive :: LineValue
foreign import capi unsafe "gpiod.h gpiod_line_settings_new"
lineSettingsNew :: IO (Ptr LineSettings)
foreign import capi unsafe "gpiod.h gpiod_line_settings_free"
lineSettingsFree :: Ptr LineSettings -> IO ()
foreign import capi unsafe "gpiod.h gpiod_line_settings_set_direction"
lineSettingsSetDirection :: Ptr LineSettings -> LineDirection -> IO CInt
foreign import capi unsafe "gpiod.h gpiod_line_settings_set_output_value"
lineSettingsSetOutputValue :: Ptr LineSettings -> LineValue -> IO CInt
data LineConfig
foreign import capi unsafe "gpiod.h gpiod_line_config_new"
lineConfigNew :: IO (Ptr LineConfig)
foreign import capi unsafe "gpiod.h gpiod_line_config_free"
lineConfigFree :: Ptr LineConfig -> IO ()
foreign import capi unsafe "gpiod.h gpiod_line_config_add_line_settings"
lineConfigAddLineSettings
:: Ptr LineConfig -> Ptr CUInt -> CSize -> Ptr LineSettings -> IO CInt
data RequestConfig
foreign import capi unsafe "gpiod.h gpiod_request_config_new"
requestConfigNew :: IO (Ptr RequestConfig)
foreign import capi unsafe "gpiod.h gpiod_request_config_free"
requestConfigFree :: Ptr RequestConfig -> IO ()
foreign import capi unsafe "gpiod.h gpiod_request_config_set_consumer"
requestConfigSetConsumer :: Ptr RequestConfig -> CString -> IO ()
data LineRequest
foreign import capi unsafe "gpiod.h gpiod_chip_request_lines"
chipRequestLines
:: Ptr Chip -> Ptr RequestConfig -> Ptr LineConfig -> IO (Ptr LineRequest)
foreign import capi unsafe "gpiod.h gpiod_line_request_release"
lineRequestRelease :: Ptr LineRequest -> IO ()
foreign import capi unsafe "gpiod.h gpiod_line_request_set_value"
lineRequestSetValue :: Ptr LineRequest -> CUInt -> LineValue -> IO CInt
foreign import capi unsafe "gpiod.h gpiod_line_request_set_values"
lineRequestSetValues :: Ptr LineRequest -> Ptr LineValue -> IO CInt
|
