open Ctypes

type error =
  | Number of int             (** A positive number *)
	| Success                   (** Success (no error) *)
  | Error_io                  (** Input/output error *)
  | Error_invalid_param       (** Invalid parameter *)
  | Error_access              (** Access denied (insufficient permissions) *)
  | Error_no_device           (** No such device (it may have been disconnected) *)
  | Error_not_found           (** Entity not found *)
  | Error_busy                (** Resource busy *)
  | Error_timeout             (** Operation timed out *)
  | Error_overflow            (** Overflow *)
  | Error_pipe                (** Pipe error *)
  | Error_interrupted         (** System call interrupted (perhaps due to signal) *)
  | Error_no_mem              (** Insufficient memory *)
  | Error_not_supported       (** Operation not supported or unimplemented on this platform *)
  | Error_other               (** Other error *)

type version = {
  major: int;                   (** Library major version *)
  minor: int;                   (** Library major version *)
  micro: int;                   (** Library micro version *)
  nano: int;                    (** Library nano version *)
  rc: string;                   (** Library release candidate suffix string, e.g. "-rc4" *)
  describe: string;             (** For ABI compatibility only *)
}

type device_descriptor = {
  id_vendor: int;	      (** Vendor ID. *)
  id_product: int;   	  (** Product ID.*)
  i_manufacturer: int;	(** Index of string descriptor describing manufacturer. *)
  i_product: int;	      (** Index of string descriptor describing product. *)
  num_configurations: int;
}

module Types(T:Cstubs.Types.TYPE) = struct
  let success              = T.constant "LIBUSB_SUCCESS"             T.int64_t
  let error_io             = T.constant "LIBUSB_ERROR_IO"            T.int64_t
  let error_invalid_param  = T.constant "LIBUSB_ERROR_INVALID_PARAM" T.int64_t
  let error_access         = T.constant "LIBUSB_ERROR_ACCESS"        T.int64_t
  let error_no_device      = T.constant "LIBUSB_ERROR_NO_DEVICE"     T.int64_t
  let error_not_found      = T.constant "LIBUSB_ERROR_NOT_FOUND"     T.int64_t
  let error_busy           = T.constant "LIBUSB_ERROR_BUSY"          T.int64_t
  let error_timeout        = T.constant "LIBUSB_ERROR_TIMEOUT"       T.int64_t
  let error_overflow       = T.constant "LIBUSB_ERROR_OVERFLOW"      T.int64_t
  let error_pipe           = T.constant "LIBUSB_ERROR_PIPE"          T.int64_t
  let error_interrupted    = T.constant "LIBUSB_ERROR_INTERRUPTED"   T.int64_t
  let error_no_mem         = T.constant "LIBUSB_ERROR_NO_MEM"        T.int64_t
  let error_not_supported  = T.constant "LIBUSB_ERROR_NOT_SUPPORTED" T.int64_t
  let error_other          = T.constant "LIBUSB_ERROR_OTHER"         T.int64_t

  let error = T.enum "libusb_error" [
      Success,               success;
      Error_io,              error_io;
      Error_invalid_param,   error_invalid_param ;
      Error_access,          error_access ;
	    Error_no_device,       error_no_device ;
	    Error_not_found,       error_not_found;
 	    Error_busy,   	       error_busy ;
      Error_timeout,         error_timeout;
      Error_overflow,        error_overflow;
	    Error_pipe,  	         error_pipe ;
      Error_interrupted,     error_interrupted;
	    Error_no_mem,          error_no_mem ;
      Error_not_supported,   error_not_supported;
      Error_other,           error_other ;
    ] ~unexpected:(fun x -> Number (Int64.to_int x))

  let request_type_standard  = T.constant "LIBUSB_REQUEST_TYPE_STANDARD" T.int64_t
  let request_type_class     = T.constant "LIBUSB_REQUEST_TYPE_CLASS"    T.int64_t
  let request_type_vendor    = T.constant "LIBUSB_REQUEST_TYPE_VENDOR"   T.int64_t
  let request_type_reserved  = T.constant "LIBUSB_REQUEST_TYPE_RESERVED" T.int64_t

  let endpoint_direction_in  = T.constant "LIBUSB_ENDPOINT_IN"  T.int64_t
  let endpoint_direction_out = T.constant "LIBUSB_ENDPOINT_OUT" T.int64_t

  let libusb_recipient_device    = T.constant "LIBUSB_RECIPIENT_DEVICE"    T.int64_t
  let libusb_recipient_interface = T.constant "LIBUSB_RECIPIENT_INTERFACE" T.int64_t
  let libusb_recipient_endpoint  = T.constant "LIBUSB_RECIPIENT_ENDPOINT"  T.int64_t
  let libusb_recipient_other     = T.constant "LIBUSB_RECIPIENT_OTHER"     T.int64_t

  type version
  let version : version structure typ = structure "libusb_version"
  let (|:) n t = field version n t
  let version_major = "major" |: uint16_t
  let version_minor = "minor" |: uint16_t
  let version_micro = "micro" |: uint16_t
  let version_nano = "nano" |: uint16_t
  let version_rc = "rc" |: string
  let version_describe = "describe" |: string
  let () = seal version

  type device
  let device : device structure typ = structure "libusb_device"

  type device_handle
  let device_handle : device_handle structure typ = structure "libusb_device_handle"

  type device_descriptor
  let device_descriptor : device_descriptor structure typ = structure "libusb_device_descriptor"
  let (|:) n t = field device_descriptor n t
  let device_descriptor_blength =            "bLength"            |: uint8_t  (* Size of this descriptor (in bytes) *)
  let device_descriptor_bdescriptortype =    "bDescriptorType"    |: uint8_t  (* Descriptor type. *)
  let device_descriptor_bcdusb =             "bcdUSB"             |: uint16_t (* USB specification release number in binary-coded decimal. *)
  let device_descriptor_bdeviceclass =       "bDeviceClass"       |: uint8_t  (* USB-IF class code for the device. *)
  let device_descriptor_bdevicesubclass =    "bDeviceSubClass"    |: uint8_t  (* USB-IF subclass code for the device, qualified by the bDeviceClass value. *)
  let device_descriptor_bdeviceprotocol =    "bDeviceProtocol"    |: uint8_t  (* USB-IF protocol code for the device, qualified by the bDeviceClass and bDeviceSubClass values. *)
  let device_descriptor_bmaxpacketsize0 =    "bMaxPacketSize0"    |: uint8_t  (* Maximum packet size for endpoint 0. *)
  let device_descriptor_idvendor =           "idVendor"           |: uint16_t (* USB-IF vendor ID. *)
  let device_descriptor_idproduct =          "idProduct"          |: uint16_t (* USB-IF product ID.*)
  let device_descriptor_bcddevice =          "bcdDevice"          |: uint16_t (* Device release number in binary-coded decimal. *)
  let device_descriptor_imanufacturer =      "iManufacturer"      |: uint8_t  (* Index of string descriptor describing manufacturer. *)
  let device_descriptor_iproduct =           "iProduct"           |: uint8_t  (* Index of string descriptor describing product. *)
  let device_descriptor_iserialnumber =      "iSerialNumber"      |: uint8_t  (* Index of string descriptor containing device serial number. *)
  let device_descriptor_bnumconfigurations = "bNumConfigurations" |: uint8_t 	(* Number of possible configurations.  *)
  let () = seal device_descriptor
end