// 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 <ds@schleef.org> */#include <linux/uaccess.h>#include <linux/comedi/comedidev.h>#include "comedi_internal.h"const struct comedi_lrange range_bipolar10 = { 1, {BIP_RANGE(10)} };EXPORT_SYMBOL_GPL(range_bipolar10);const struct comedi_lrange range_bipolar5 = { 1, {BIP_RANGE(5)} };EXPORT_SYMBOL_GPL(range_bipolar5);const struct comedi_lrange range_bipolar2_5 = { 1, {BIP_RANGE(2.5)} };EXPORT_SYMBOL_GPL(range_bipolar2_5);const struct comedi_lrange range_unipolar10 = { 1, {UNI_RANGE(10)} };EXPORT_SYMBOL_GPL(range_unipolar10);const struct comedi_lrange range_unipolar5 = { 1, {UNI_RANGE(5)} };EXPORT_SYMBOL_GPL(range_unipolar5);const struct comedi_lrange range_unipolar2_5 = { 1, {UNI_RANGE(2.5)} };EXPORT_SYMBOL_GPL(range_unipolar2_5);const struct comedi_lrange range_0_20mA = { 1, {RANGE_mA(0, 20)} };EXPORT_SYMBOL_GPL(range_0_20mA);const struct comedi_lrange range_4_20mA = { 1, {RANGE_mA(4, 20)} };EXPORT_SYMBOL_GPL(range_4_20mA);const struct comedi_lrange range_0_32mA = { 1, {RANGE_mA(0, 32)} };EXPORT_SYMBOL_GPL(range_0_32mA);const struct comedi_lrange range_unknown = { 1, {{0, 1000000, UNIT_none} } };EXPORT_SYMBOL_GPL(range_unknown);/* * 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){ int subd, chan; const struct comedi_lrange *lr; struct comedi_subdevice *s; subd = (it->range_type >> 24) & 0xff; chan = (it->range_type >> 16) & 0xff; if (!dev->attached) return -EINVAL; if (subd >= dev->n_subdevices) return -EINVAL; s = &dev->subdevices[subd]; if (s->range_table) { lr = s->range_table; } else if (s->range_table_list) { if (chan >= s->n_chan) return -EINVAL; lr = s->range_table_list[chan]; } else { return -EINVAL; } if (RANGE_LENGTH(it->range_type) != lr->length) { dev_dbg(dev->class_dev, "wrong length %d should be %d (0x%08x)\n", RANGE_LENGTH(it->range_type), lr->length, it->range_type); return -EINVAL; } if (copy_to_user(it->range_ptr, lr->range, sizeof(struct comedi_krange) * lr->length)) return -EFAULT; return 0;}/** * 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){ struct comedi_device *dev = s->device; unsigned int chanspec; int chan, range_len, i; for (i = 0; i < n; i++) { chanspec = chanlist[i]; chan = CR_CHAN(chanspec); if (s->range_table) range_len = s->range_table->length; else if (s->range_table_list && chan < s->n_chan) range_len = s->range_table_list[chan]->length; else range_len = 0; if (chan >= s->n_chan || CR_RANGE(chanspec) >= range_len) { dev_warn(dev->class_dev, "bad chanlist[%d]=0x%08x chan=%d range length=%d\n", i, chanspec, chan, range_len); return -EINVAL; } } return 0;}EXPORT_SYMBOL_GPL(comedi_check_chanlist);
// 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 <ds@schleef.org>
*/
#include <linux/uaccess.h>
#include <linux/comedi/comedidev.h>
#include "comedi_internal.h"
const struct comedi_lrange range_bipolar10 = { 1, {BIP_RANGE(10)} };
EXPORT_SYMBOL_GPL(range_bipolar10);
const struct comedi_lrange range_bipolar5 = { 1, {BIP_RANGE(5)} };
EXPORT_SYMBOL_GPL(range_bipolar5);
const struct comedi_lrange range_bipolar2_5 = { 1, {BIP_RANGE(2.5)} };
EXPORT_SYMBOL_GPL(range_bipolar2_5);
const struct comedi_lrange range_unipolar10 = { 1, {UNI_RANGE(10)} };
EXPORT_SYMBOL_GPL(range_unipolar10);
const struct comedi_lrange range_unipolar5 = { 1, {UNI_RANGE(5)} };
EXPORT_SYMBOL_GPL(range_unipolar5);
const struct comedi_lrange range_unipolar2_5 = { 1, {UNI_RANGE(2.5)} };
EXPORT_SYMBOL_GPL(range_unipolar2_5);
const struct comedi_lrange range_0_20mA = { 1, {RANGE_mA(0, 20)} };
EXPORT_SYMBOL_GPL(range_0_20mA);
const struct comedi_lrange range_4_20mA = { 1, {RANGE_mA(4, 20)} };
EXPORT_SYMBOL_GPL(range_4_20mA);
const struct comedi_lrange range_0_32mA = { 1, {RANGE_mA(0, 32)} };
EXPORT_SYMBOL_GPL(range_0_32mA);
const struct comedi_lrange range_unknown = { 1, {{0, 1000000, UNIT_none} } };
EXPORT_SYMBOL_GPL(range_unknown);
/*
* 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)
{
int subd, chan;
const struct comedi_lrange *lr;
struct comedi_subdevice *s;
subd = (it->range_type >> 24) & 0xff;
chan = (it->range_type >> 16) & 0xff;
if (!dev->attached)
return -EINVAL;
if (subd >= dev->n_subdevices)
return -EINVAL;
s = &dev->subdevices[subd];
if (s->range_table) {
lr = s->range_table;
} else if (s->range_table_list) {
if (chan >= s->n_chan)
return -EINVAL;
lr = s->range_table_list[chan];
} else {
return -EINVAL;
}
if (RANGE_LENGTH(it->range_type) != lr->length) {
dev_dbg(dev->class_dev,
"wrong length %d should be %d (0x%08x)\n",
RANGE_LENGTH(it->range_type),
lr->length, it->range_type);
return -EINVAL;
}
if (copy_to_user(it->range_ptr, lr->range,
sizeof(struct comedi_krange) * lr->length))
return -EFAULT;
return 0;
}
/**
* 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)
{
struct comedi_device *dev = s->device;
unsigned int chanspec;
int chan, range_len, i;
for (i = 0; i < n; i++) {
chanspec = chanlist[i];
chan = CR_CHAN(chanspec);
if (s->range_table)
range_len = s->range_table->length;
else if (s->range_table_list && chan < s->n_chan)
range_len = s->range_table_list[chan]->length;
else
range_len = 0;
if (chan >= s->n_chan ||
CR_RANGE(chanspec) >= range_len) {
dev_warn(dev->class_dev,
"bad chanlist[%d]=0x%08x chan=%d range length=%d\n",
i, chanspec, chan, range_len);
return -EINVAL;
}
}
return 0;
}
EXPORT_SYMBOL_GPL(comedi_check_chanlist);