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631e272b12
Some of the header files in "drivers/comedi/drivers/" are common enough to be useful to out-of-tree comedi driver modules. Using them for out-of-tree module builds is hampered by the headers being outside the "include/" directory so it is desirable to move them. There are about a couple of dozen Comedi device drivers that use the "comedi_8255" module to add digital I/O subdevices based on the venerable 8255 Programmable Peripheral Interface chip. The macros and declarations to use that module are in the "8255.h" header file in the comedi "drivers" directory. Move it into "include/linux/comedi/" and rename it to "comedi_8255.h" for naming consistency reasons. Signed-off-by: Ian Abbott <abbotti@mev.co.uk> Link: https://lore.kernel.org/r/20211117120604.117740-4-abbotti@mev.co.uk Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
42 lines
1.2 KiB
C
42 lines
1.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* comedi_8255.h
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* Generic 8255 digital I/O subdevice support
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*
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* COMEDI - Linux Control and Measurement Device Interface
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* Copyright (C) 1998 David A. Schleef <ds@schleef.org>
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*/
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#ifndef _COMEDI_8255_H
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#define _COMEDI_8255_H
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#define I8255_SIZE 0x04
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#define I8255_DATA_A_REG 0x00
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#define I8255_DATA_B_REG 0x01
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#define I8255_DATA_C_REG 0x02
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#define I8255_CTRL_REG 0x03
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#define I8255_CTRL_C_LO_IO BIT(0)
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#define I8255_CTRL_B_IO BIT(1)
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#define I8255_CTRL_B_MODE BIT(2)
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#define I8255_CTRL_C_HI_IO BIT(3)
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#define I8255_CTRL_A_IO BIT(4)
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#define I8255_CTRL_A_MODE(x) ((x) << 5)
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#define I8255_CTRL_CW BIT(7)
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struct comedi_device;
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struct comedi_subdevice;
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int subdev_8255_init(struct comedi_device *dev, struct comedi_subdevice *s,
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int (*io)(struct comedi_device *dev, int dir, int port,
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int data, unsigned long regbase),
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unsigned long regbase);
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int subdev_8255_mm_init(struct comedi_device *dev, struct comedi_subdevice *s,
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int (*io)(struct comedi_device *dev, int dir, int port,
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int data, unsigned long regbase),
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unsigned long regbase);
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unsigned long subdev_8255_regbase(struct comedi_subdevice *s);
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#endif
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