/* SPDX-License-Identifier: GPL-2.0+ */
/*
 * comedi_8255.h
 * Generic 8255 digital I/O subdevice support
 *
 * COMEDI - Linux Control and Measurement Device Interface
 * Copyright (C) 1998 David A. Schleef <[email protected]>
 */

#ifndef _COMEDI_8255_H
#define _COMEDI_8255_H

#define I8255_SIZE        0x04

#define I8255_DATA_A_REG    0x00
#define I8255_DATA_B_REG    0x01
#define I8255_DATA_C_REG    0x02
#define I8255_CTRL_REG        0x03
#define I8255_CTRL_C_LO_IO    BIT(0)
#define I8255_CTRL_B_IO        BIT(1)
#define I8255_CTRL_B_MODE    BIT(2)
#define I8255_CTRL_C_HI_IO    BIT(3)
#define I8255_CTRL_A_IO        BIT(4)
#define I8255_CTRL_A_MODE(x)    ((x) << 5)
#define I8255_CTRL_CW        BIT(7)

struct comedi_device;
struct comedi_subdevice;

int subdev_8255_init(struct comedi_device *dev, struct comedi_subdevice *s,
             int (*io)(struct comedi_device *dev, int dir, int port,
                   int data, unsigned long regbase),
             unsigned long regbase);

int subdev_8255_mm_init(struct comedi_device *dev, struct comedi_subdevice *s,
            int (*io)(struct comedi_device *dev, int dir, int port,
                  int data, unsigned long regbase),
            unsigned long regbase);

unsigned long subdev_8255_regbase(struct comedi_subdevice *s);

#endif