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/*
module/range.c
comedi routines for voltage ranges
COMEDI - Linux Control and Measurement Device Interface
Copyright (C) 1997-8 David A. Schleef <ds@schleef.org>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
*/
#include <linux/uaccess.h>
#include "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
range information ioctl
arg:
pointer to rangeinfo structure
reads:
range info structure
writes:
n struct comedi_krange structures to rangeinfo->range_ptr
*/
int do_rangeinfo_ioctl(struct comedi_device *dev,
struct comedi_rangeinfo __user *arg)
{
struct comedi_rangeinfo it;
int subd, chan;
const struct comedi_lrange *lr;
struct comedi_subdevice *s;
if (copy_from_user(&it, arg, sizeof(struct comedi_rangeinfo)))
return -EFAULT;
subd = (it.range_type >> 24) & 0xf;
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;
}
static int aref_invalid(struct comedi_subdevice *s, unsigned int chanspec)
{
unsigned int aref;
/* disable reporting invalid arefs... maybe someday */
return 0;
aref = CR_AREF(chanspec);
switch (aref) {
case AREF_DIFF:
if (s->subdev_flags & SDF_DIFF)
return 0;
break;
case AREF_COMMON:
if (s->subdev_flags & SDF_COMMON)
return 0;
break;
case AREF_GROUND:
if (s->subdev_flags & SDF_GROUND)
return 0;
break;
case AREF_OTHER:
if (s->subdev_flags & SDF_OTHER)
return 0;
break;
default:
break;
}
dev_dbg(s->device->class_dev, "subdevice does not support aref %i",
aref);
return 1;
}
/**
* 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
*/
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;
if (s->range_table || s->range_table_list) {
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 ||
aref_invalid(s, chanspec)) {
dev_warn(dev->class_dev,
"bad chanlist[%d]=0x%08x chan=%d range length=%d\n",
i, chanspec, chan, range_len);
return -EINVAL;
}
}
} else {
dev_err(dev->class_dev, "(bug) no range type list!\n");
return -EINVAL;
}
return 0;
}
EXPORT_SYMBOL_GPL(comedi_check_chanlist);
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