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7187a0939a
In a future patch, the port I/O functions (`inb()`, `outb()`, and friends will only be declared in the `HAS_IOPORT` configuration option is enabled. The comedi_8255 module supports both port I/O and memory-mapped I/O. Conditionally compile the parts of the module that use port I/O if and only if the `CONFIG_HAS_IOPORT` macro is defined so that it can still be built if the port I/O functions have not been declared. If the `CONFIG_HAS_IOPORT` macro is undefined, replace the GPL-exported `subdev_8255_io_init()` function with a dummy static inline version that just returns `-ENXIO`. Cc: Arnd Bergmann <arnd@kernel.org> Cc: Niklas Schnelle <schnelle@linux.ibm.com> Signed-off-by: Ian Abbott <abbotti@mev.co.uk> Link: https://lore.kernel.org/r/20230913170712.111719-8-abbotti@mev.co.uk Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
55 lines
1.4 KiB
C
55 lines
1.4 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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#include <linux/errno.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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#ifdef CONFIG_HAS_IOPORT
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int subdev_8255_io_init(struct comedi_device *dev, struct comedi_subdevice *s,
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unsigned long regbase);
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#else
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static inline int subdev_8255_io_init(struct comedi_device *dev,
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struct comedi_subdevice *s,
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unsigned long regbase)
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{
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return -ENXIO;
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}
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#endif
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int subdev_8255_mm_init(struct comedi_device *dev, struct comedi_subdevice *s,
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unsigned long regbase);
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int subdev_8255_cb_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 context),
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unsigned long context);
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unsigned long subdev_8255_regbase(struct comedi_subdevice *s);
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#endif
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