/* 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 <ds@schleef.org>

*/

#ifndef _COMEDI_8255_H

#define _COMEDI_8255_H

#include <linux/errno.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;

#ifdef CONFIG_HAS_IOPORT

int subdev_8255_io_init(struct comedi_device *dev, struct comedi_subdevice *s,

unsigned long regbase);

#else

static inline int subdev_8255_io_init(struct comedi_device *dev,

struct comedi_subdevice *s,

unsigned long regbase)

{

return -ENXIO;

}

#endif

int subdev_8255_mm_init(struct comedi_device *dev, struct comedi_subdevice *s,

unsigned long regbase);

int subdev_8255_cb_init(struct comedi_device *dev, struct comedi_subdevice *s,

int (*io)(struct comedi_device *dev, int dir, int port,

int data, unsigned long context),

unsigned long context);

unsigned long subdev_8255_regbase(struct comedi_subdevice *s);

#endif