| /* 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 |
| |
| #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; |
| |
| int subdev_8255_init(struct comedi_device *dev, struct comedi_subdevice *s, |
| int (*io)(struct comedi_device *dev, int dir, int port, |
| int data, unsigned long regbase), |
| unsigned long regbase); |
| |
| int subdev_8255_mm_init(struct comedi_device *dev, struct comedi_subdevice *s, |
| int (*io)(struct comedi_device *dev, int dir, int port, |
| int data, unsigned long regbase), |
| unsigned long regbase); |
| |
| unsigned long subdev_8255_regbase(struct comedi_subdevice *s); |
| |
| #endif |
