1 /* SPDX-License-Identifier: GPL-2.0+ */ 2 /* 3 * comedi_8255.h 4 * Generic 8255 digital I/O subdevice support 5 * 6 * COMEDI - Linux Control and Measurement Device Interface 7 * Copyright (C) 1998 David A. Schleef <ds@schleef.org> 8 */ 9 10 #ifndef _COMEDI_8255_H 11 #define _COMEDI_8255_H 12 13 #include <linux/errno.h> 14 15 #define I8255_SIZE 0x04 16 17 #define I8255_DATA_A_REG 0x00 18 #define I8255_DATA_B_REG 0x01 19 #define I8255_DATA_C_REG 0x02 20 #define I8255_CTRL_REG 0x03 21 #define I8255_CTRL_C_LO_IO BIT(0) 22 #define I8255_CTRL_B_IO BIT(1) 23 #define I8255_CTRL_B_MODE BIT(2) 24 #define I8255_CTRL_C_HI_IO BIT(3) 25 #define I8255_CTRL_A_IO BIT(4) 26 #define I8255_CTRL_A_MODE(x) ((x) << 5) 27 #define I8255_CTRL_CW BIT(7) 28 29 struct comedi_device; 30 struct comedi_subdevice; 31 32 #ifdef CONFIG_HAS_IOPORT 33 int subdev_8255_io_init(struct comedi_device *dev, struct comedi_subdevice *s, 34 unsigned long regbase); 35 #else 36 static inline int subdev_8255_io_init(struct comedi_device *dev, 37 struct comedi_subdevice *s, 38 unsigned long regbase) 39 { 40 return -ENXIO; 41 } 42 #endif 43 44 int subdev_8255_mm_init(struct comedi_device *dev, struct comedi_subdevice *s, 45 unsigned long regbase); 46 47 int subdev_8255_cb_init(struct comedi_device *dev, struct comedi_subdevice *s, 48 int (*io)(struct comedi_device *dev, int dir, int port, 49 int data, unsigned long context), 50 unsigned long context); 51 52 unsigned long subdev_8255_regbase(struct comedi_subdevice *s); 53 54 #endif 55