5 * COMEDI - Linux Control and Measurement Device Interface
6 * Copyright (C) 1998 David A. Schleef <ds@schleef.org>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
22 #define I8255_SIZE 0x04
24 #define I8255_DATA_A_REG 0x00
25 #define I8255_DATA_B_REG 0x01
26 #define I8255_DATA_C_REG 0x02
27 #define I8255_CTRL_REG 0x03
28 #define I8255_CTRL_C_LO_IO BIT(0)
29 #define I8255_CTRL_B_IO BIT(1)
30 #define I8255_CTRL_B_MODE BIT(2)
31 #define I8255_CTRL_C_HI_IO BIT(3)
32 #define I8255_CTRL_A_IO BIT(4)
33 #define I8255_CTRL_A_MODE(x) ((x) << 5)
34 #define I8255_CTRL_CW BIT(7)
37 struct comedi_subdevice;
39 int subdev_8255_init(struct comedi_device *dev, struct comedi_subdevice *s,
40 int (*io)(struct comedi_device *dev, int dir, int port,
41 int data, unsigned long regbase),
42 unsigned long regbase);
44 int subdev_8255_mm_init(struct comedi_device *dev, struct comedi_subdevice *s,
45 int (*io)(struct comedi_device *dev, int dir, int port,
46 int data, unsigned long regbase),
47 unsigned long regbase);
49 unsigned long subdev_8255_regbase(struct comedi_subdevice *s);