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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.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "comedidev.h"
#include <asm/uaccess.h>
const comedi_lrange range_bipolar10 = { 1, {BIP_RANGE(10)} };
const comedi_lrange range_bipolar5 = { 1, {BIP_RANGE(5)} };
const comedi_lrange range_bipolar2_5 = { 1, {BIP_RANGE(2.5)} };
const comedi_lrange range_unipolar10 = { 1, {UNI_RANGE(10)} };
const comedi_lrange range_unipolar5 = { 1, {UNI_RANGE(5)} };
const comedi_lrange range_unknown = { 1, {{0, 1000000, UNIT_none}} };
/*
COMEDI_RANGEINFO
range information ioctl
arg:
pointer to rangeinfo structure
reads:
range info structure
writes:
n comedi_krange structures to rangeinfo->range_ptr
*/
int do_rangeinfo_ioctl(comedi_device * dev, comedi_rangeinfo * arg)
{
comedi_rangeinfo it;
int subd, chan;
const comedi_lrange *lr;
comedi_subdevice *s;
if (copy_from_user(&it, arg, sizeof(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) {
DPRINTK("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(comedi_krange) * lr->length))
return -EFAULT;
return 0;
}
static int aref_invalid(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;
}
DPRINTK("subdevice does not support aref %i", aref);
return 1;
}
/*
This function checks each element in a channel/gain list to make
make sure it is valid.
*/
int check_chanlist(comedi_subdevice * s, int n, unsigned int *chanlist)
{
int i;
int chan;
if (s->range_table) {
for (i = 0; i < n; i++)
if (CR_CHAN(chanlist[i]) >= s->n_chan ||
CR_RANGE(chanlist[i]) >= s->range_table->length
|| aref_invalid(s, chanlist[i])) {
rt_printk
("bad chanlist[%d]=0x%08x n_chan=%d range length=%d\n",
i, chanlist[i], s->n_chan,
s->range_table->length);
#if 0
for (i = 0; i < n; i++) {
printk("[%d]=0x%08x\n", i, chanlist[i]);
}
#endif
return -EINVAL;
}
} else if (s->range_table_list) {
for (i = 0; i < n; i++) {
chan = CR_CHAN(chanlist[i]);
if (chan >= s->n_chan ||
CR_RANGE(chanlist[i]) >=
s->range_table_list[chan]->length
|| aref_invalid(s, chanlist[i])) {
rt_printk("bad chanlist[%d]=0x%08x\n", i,
chanlist[i]);
return -EINVAL;
}
}
} else {
rt_printk("comedi: (bug) no range type list!\n");
return -EINVAL;
}
return 0;
}
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