linux/drivers/comedi/range.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * comedi/range.c
 * comedi routines for voltage ranges
 *
 * COMEDI - Linux Control and Measurement Device Interface
 * Copyright (C) 1997-8 David A. Schleef <[email protected]>
 */

#include <linux/uaccess.h>
#include <linux/comedi/comedidev.h>
#include "comedi_internal.h"

const struct comedi_lrange range_bipolar10 = …;
EXPORT_SYMBOL_GPL(…);
const struct comedi_lrange range_bipolar5 = …;
EXPORT_SYMBOL_GPL(…);
const struct comedi_lrange range_bipolar2_5 = …;
EXPORT_SYMBOL_GPL(…);
const struct comedi_lrange range_unipolar10 = …;
EXPORT_SYMBOL_GPL(…);
const struct comedi_lrange range_unipolar5 = …;
EXPORT_SYMBOL_GPL(…);
const struct comedi_lrange range_unipolar2_5 = …;
EXPORT_SYMBOL_GPL(…);
const struct comedi_lrange range_0_20mA = …;
EXPORT_SYMBOL_GPL(…);
const struct comedi_lrange range_4_20mA = …;
EXPORT_SYMBOL_GPL(…);
const struct comedi_lrange range_0_32mA = …;
EXPORT_SYMBOL_GPL(…);
const struct comedi_lrange range_unknown = …;
EXPORT_SYMBOL_GPL(…);

/*
 * COMEDI_RANGEINFO ioctl
 * range information
 *
 * arg:
 *	pointer to comedi_rangeinfo structure
 *
 * reads:
 *	comedi_rangeinfo structure
 *
 * writes:
 *	array of comedi_krange structures to rangeinfo->range_ptr pointer
 */
int do_rangeinfo_ioctl(struct comedi_device *dev,
		       struct comedi_rangeinfo *it)
{ … }

/**
 * comedi_check_chanlist() - Validate each element in a chanlist.
 * @s: comedi_subdevice struct
 * @n: number of elements in the chanlist
 * @chanlist: the chanlist to validate
 *
 * Each element consists of a channel number, a range index, an analog
 * reference type and some flags, all packed into an unsigned int.
 *
 * This checks that the channel number and range index are supported by
 * the comedi subdevice.  It does not check whether the analog reference
 * type and the flags are supported.  Drivers that care should check those
 * themselves.
 *
 * Return: %0 if all @chanlist elements are valid (success),
 *         %-EINVAL if one or more elements are invalid.
 */
int comedi_check_chanlist(struct comedi_subdevice *s, int n,
			  unsigned int *chanlist)
{ … }
EXPORT_SYMBOL_GPL(…);