LXR linux/drivers/staging/comedi/drivers/8255.h

   1/* SPDX-License-Identifier: GPL-2.0+ */
   2/*
   3 * module/8255.h
   4 * Header file for 8255
   5 *
   6 * COMEDI - Linux Control and Measurement Device Interface
   7 * Copyright (C) 1998 David A. Schleef <ds@schleef.org>
   8 */
   9
  10#ifndef _8255_H
  11#define _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
  27struct comedi_device;
  28struct comedi_subdevice;
  29
  30int 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
  35int 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
  40unsigned long subdev_8255_regbase(struct comedi_subdevice *s);
  41
  42#endif
  43