| 1 | /* SPDX-License-Identifier: GPL-2.0+ */ |
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| 2 | /* |
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| 3 | * comedilib.h |
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| 4 | * Header file for kcomedilib |
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| 5 | * |
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| 6 | * COMEDI - Linux Control and Measurement Device Interface |
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| 7 | * Copyright (C) 1998-2001 David A. Schleef <ds@schleef.org> |
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| 8 | */ |
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| 9 | |
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| 10 | #ifndef _LINUX_COMEDILIB_H |
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| 11 | #define _LINUX_COMEDILIB_H |
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| 12 | |
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| 13 | struct comedi_device *comedi_open_from(const char *path, int from); |
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| 14 | |
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| 15 | /** |
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| 16 | * comedi_open() - Open a COMEDI device from the kernel |
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| 17 | * @filename: Fake pathname of the form "/dev/comediN". |
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| 18 | * |
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| 19 | * Converts @filename to a COMEDI device number and "opens" it if it exists |
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| 20 | * and is attached to a low-level COMEDI driver. |
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| 21 | * |
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| 22 | * Return: A pointer to the COMEDI device on success. |
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| 23 | * Return %NULL on failure. |
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| 24 | */ |
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| 25 | static inline struct comedi_device *comedi_open(const char *path) |
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| 26 | { |
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| 27 | return comedi_open_from(path, from: -1); |
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| 28 | } |
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| 29 | |
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| 30 | int comedi_close_from(struct comedi_device *dev, int from); |
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| 31 | |
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| 32 | /** |
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| 33 | * comedi_close() - Close a COMEDI device from the kernel |
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| 34 | * @dev: COMEDI device. |
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| 35 | * |
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| 36 | * Closes a COMEDI device previously opened by comedi_open(). |
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| 37 | * |
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| 38 | * Returns: 0 |
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| 39 | */ |
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| 40 | static inline int comedi_close(struct comedi_device *dev) |
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| 41 | { |
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| 42 | return comedi_close_from(dev, from: -1); |
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| 43 | } |
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| 44 | |
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| 45 | int comedi_dio_get_config(struct comedi_device *dev, unsigned int subdev, |
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| 46 | unsigned int chan, unsigned int *io); |
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| 47 | int comedi_dio_config(struct comedi_device *dev, unsigned int subdev, |
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| 48 | unsigned int chan, unsigned int io); |
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| 49 | int comedi_dio_bitfield2(struct comedi_device *dev, unsigned int subdev, |
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| 50 | unsigned int mask, unsigned int *bits, |
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| 51 | unsigned int base_channel); |
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| 52 | int comedi_find_subdevice_by_type(struct comedi_device *dev, int type, |
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| 53 | unsigned int subd); |
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| 54 | int comedi_get_n_channels(struct comedi_device *dev, unsigned int subdevice); |
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| 55 | |
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| 56 | #endif |
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| 57 | |
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