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/*  io.h

 *

 *  This include file contains all the constants and structures associated

 *  with the Input/Output Manager.  This manager provides a well defined

 *  mechanism for accessing device drivers and a structured methodology for

 *  organizing device drivers.

 *

 *  Directives provided are:

 *

 *     + initialize a device driver

 *     + open a device driver

 *     + close a device driver

 *     + read from a device driver

 *     + write to a device driver

 *     + special device services

 *

 *  COPYRIGHT (c) 1989-1999.

 *  On-Line Applications Research Corporation (OAR).

 *

 *  The license and distribution terms for this file may be

 *  found in the file LICENSE in this distribution or at

 *  http://www.OARcorp.com/rtems/license.html.

 *

 *  $Id: io.h,v 1.2 2001-09-27 11:59:19 chris Exp $

 */

#ifndef __RTEMS_IO_h

#define __RTEMS_IO_h

#ifdef __cplusplus

extern "C" {

#endif

#include <rtems/rtems/status.h>

/*

 *

 *  The following defines the types for:

 *

 *    + major and minor numbers

 *    + the return type of a device driver entry

 *    + a pointer to a device driver entry

 *    + an entry in the the Device Driver Address Table.  Each entry in this

 *      table corresponds to an application provided device driver and

 *      defines the entry points for that device driver.

 */

typedef unsigned32 rtems_device_major_number;

typedef unsigned32 rtems_device_minor_number;

typedef rtems_status_code rtems_device_driver;

typedef rtems_device_driver ( *rtems_device_driver_entry )(

                 rtems_device_major_number,

                 rtems_device_minor_number,

                 void *

             );

typedef struct {

  rtems_device_driver_entry initialization; /* initialization procedure */

  rtems_device_driver_entry open;           /* open request procedure */

  rtems_device_driver_entry close;          /* close request procedure */

  rtems_device_driver_entry read;           /* read request procedure */

  rtems_device_driver_entry write;          /* write request procedure */

  rtems_device_driver_entry control;        /* special functions procedure */

}   rtems_driver_address_table;

/*

 * Table for the io device names

 */

typedef struct {

    char                     *device_name;

    unsigned32                device_name_length;

    rtems_device_major_number major;

    rtems_device_minor_number minor;

} rtems_driver_name_t;

/*

 *  This is the table of device names.

 */

/*

 *  The following declare the data required to manage the Driver

 *  Address Table and Device Name Table.

 */

SAPI_EXTERN unsigned32                  _IO_Number_of_drivers;

SAPI_EXTERN rtems_driver_address_table *_IO_Driver_address_table;

SAPI_EXTERN unsigned32                  _IO_Number_of_devices;

SAPI_EXTERN rtems_driver_name_t        *_IO_Driver_name_table;

/*

 *  _IO_Manager_initialization

 *

 *  DESCRIPTION:

 *

 *  This routine performs the initialization necessary for this manager.

 */

void _IO_Manager_initialization(

  rtems_driver_address_table *driver_table,

  unsigned32                  number_of_drivers,

  unsigned32                  number_of_devices

);

/*

 *  rtems_io_register_name

 *

 *  DESCRIPTION:

 *

 *  Associate a name with a driver.

 *

 */

rtems_status_code rtems_io_register_name(

    char                      *device_name,

    rtems_device_major_number  major,

    rtems_device_minor_number  minor

);

/*

 *  rtems_io_lookup_name

 *

 *  DESCRIPTION:

 *

 *  Find what driver "owns" this name

 */

rtems_status_code rtems_io_lookup_name(

    const char           *name,

    rtems_driver_name_t **device_info

);

/*

 *  rtems_io_initialize

 *

 *  DESCRIPTION:

 *

 *  This routine implements the rtems_io_initialize directive.  It is invoked

 *  to initialize a device driver or an individual device.

 */

rtems_status_code rtems_io_initialize(

  rtems_device_major_number  major,

  rtems_device_minor_number  minor,

  void                      *argument

);

/*

 *  rtems_io_open

 *

 *  DESCRIPTION:

 *

 *  This routine implements the rtems_io_open directive.  It is invoked

 *  to open a device.

 */

rtems_status_code rtems_io_open(

  rtems_device_major_number  major,

  rtems_device_minor_number  minor,

  void                      *argument

);

/*

 *  rtems_io_close

 *

 *  DESCRIPTION:

 *

 *  This routine implements the rtems_io_close directive.  It is invoked

 *  to close a device.

 */

rtems_status_code rtems_io_close(

  rtems_device_major_number  major,

  rtems_device_minor_number  minor,

  void                      *argument

);

/*

 *  rtems_io_read

 *

 *  DESCRIPTION:

 *

 *  This routine implements the rtems_io_read directive.  It is invoked

 *  to read from a device.

 */

rtems_status_code rtems_io_read(

  rtems_device_major_number  major,

  rtems_device_minor_number  minor,

  void                      *argument

);

/*

 *  rtems_io_write

 *

 *  DESCRIPTION:

 *

 *  This routine implements the rtems_io_write directive.  It is invoked

 *  to write to a device.

 */

rtems_status_code rtems_io_write(

  rtems_device_major_number  major,

  rtems_device_minor_number  minor,

  void                      *argument

);

/*

 *  rtems_io_control

 *

 *  DESCRIPTION:

 *

 *  This routine implements the rtems_io_control directive.  It is invoked

 *  to perform a device specific operation on a device.

 */

rtems_status_code rtems_io_control(

  rtems_device_major_number  major,

  rtems_device_minor_number  minor,

  void                      *argument

);

/*

 *  _IO_Initialize_all_drivers

 *

 *  DESCRIPTION:

 *

 *  This routine initializes all of the device drivers configured

 *  in the Device Driver Address Table.

 */

void _IO_Initialize_all_drivers( void );

#ifdef __cplusplus

}

#endif

#endif

/* end of include file */