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/* 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
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