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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 #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