1 /* SPDX-License-Identifier: GPL-2.0+ */
2 /*
3  * comedi_8255.h
4  * Generic 8255 digital I/O subdevice support
5  *
6  * COMEDI - Linux Control and Measurement Device Interface
7  * Copyright (C) 1998 David A. Schleef <ds@schleef.org>
8  */
9 
10 #ifndef _COMEDI_8255_H
11 #define _COMEDI_8255_H
12 
13 #define I8255_SIZE		0x04
14 
15 #define I8255_DATA_A_REG	0x00
16 #define I8255_DATA_B_REG	0x01
17 #define I8255_DATA_C_REG	0x02
18 #define I8255_CTRL_REG		0x03
19 #define I8255_CTRL_C_LO_IO	BIT(0)
20 #define I8255_CTRL_B_IO		BIT(1)
21 #define I8255_CTRL_B_MODE	BIT(2)
22 #define I8255_CTRL_C_HI_IO	BIT(3)
23 #define I8255_CTRL_A_IO		BIT(4)
24 #define I8255_CTRL_A_MODE(x)	((x) << 5)
25 #define I8255_CTRL_CW		BIT(7)
26 
27 struct comedi_device;
28 struct comedi_subdevice;
29 
30 int subdev_8255_init(struct comedi_device *dev, struct comedi_subdevice *s,
31 		     int (*io)(struct comedi_device *dev, int dir, int port,
32 			       int data, unsigned long regbase),
33 		     unsigned long regbase);
34 
35 int subdev_8255_mm_init(struct comedi_device *dev, struct comedi_subdevice *s,
36 			int (*io)(struct comedi_device *dev, int dir, int port,
37 				  int data, unsigned long regbase),
38 			unsigned long regbase);
39 
40 unsigned long subdev_8255_regbase(struct comedi_subdevice *s);
41 
42 #endif
43