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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 <[email protected]>
- */
- #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
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