comedilib.h

 1/* SPDX-License-Identifier: GPL-2.0+ */
 2/*
 3 * comedilib.h
 4 * Header file for kcomedilib
 5 *
 6 * COMEDI - Linux Control and Measurement Device Interface
 7 * Copyright (C) 1998-2001 David A. Schleef <ds@schleef.org>
 8 */
 9
10#ifndef _LINUX_COMEDILIB_H
11#define _LINUX_COMEDILIB_H
12
13struct comedi_device *comedi_open_from(const char *path, int from);
14
15/**
16 * comedi_open() - Open a COMEDI device from the kernel
17 * @filename: Fake pathname of the form "/dev/comediN".
18 *
19 * Converts @filename to a COMEDI device number and "opens" it if it exists
20 * and is attached to a low-level COMEDI driver.
21 *
22 * Return: A pointer to the COMEDI device on success.
23 * Return %NULL on failure.
24 */
25static inline struct comedi_device *comedi_open(const char *path)
26{
27	return comedi_open_from(path, -1);
28}
29
30int comedi_close_from(struct comedi_device *dev, int from);
31
32/**
33 * comedi_close() - Close a COMEDI device from the kernel
34 * @dev: COMEDI device.
35 *
36 * Closes a COMEDI device previously opened by comedi_open().
37 *
38 * Returns: 0
39 */
40static inline int comedi_close(struct comedi_device *dev)
41{
42	return comedi_close_from(dev, -1);
43}
44
45int comedi_dio_get_config(struct comedi_device *dev, unsigned int subdev,
46			  unsigned int chan, unsigned int *io);
47int comedi_dio_config(struct comedi_device *dev, unsigned int subdev,
48		      unsigned int chan, unsigned int io);
49int comedi_dio_bitfield2(struct comedi_device *dev, unsigned int subdev,
50			 unsigned int mask, unsigned int *bits,
51			 unsigned int base_channel);
52int comedi_find_subdevice_by_type(struct comedi_device *dev, int type,
53				  unsigned int subd);
54int comedi_get_n_channels(struct comedi_device *dev, unsigned int subdevice);
55
56#endif