9ced1de691
Signed-off-by: Bill Pemberton <wfp5p@virginia.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
161 lines
4.0 KiB
C
161 lines
4.0 KiB
C
/*
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module/range.c
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comedi routines for voltage ranges
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COMEDI - Linux Control and Measurement Device Interface
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Copyright (C) 1997-8 David A. Schleef <ds@schleef.org>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "comedidev.h"
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#include <asm/uaccess.h>
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const struct comedi_lrange range_bipolar10 = { 1, {BIP_RANGE(10)} };
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const struct comedi_lrange range_bipolar5 = { 1, {BIP_RANGE(5)} };
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const struct comedi_lrange range_bipolar2_5 = { 1, {BIP_RANGE(2.5)} };
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const struct comedi_lrange range_unipolar10 = { 1, {UNI_RANGE(10)} };
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const struct comedi_lrange range_unipolar5 = { 1, {UNI_RANGE(5)} };
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const struct comedi_lrange range_unknown = { 1, {{0, 1000000, UNIT_none}} };
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/*
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COMEDI_RANGEINFO
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range information ioctl
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arg:
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pointer to rangeinfo structure
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reads:
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range info structure
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writes:
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n comedi_krange structures to rangeinfo->range_ptr
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*/
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int do_rangeinfo_ioctl(struct comedi_device *dev, comedi_rangeinfo *arg)
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{
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comedi_rangeinfo it;
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int subd, chan;
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const struct comedi_lrange *lr;
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struct comedi_subdevice *s;
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if (copy_from_user(&it, arg, sizeof(comedi_rangeinfo)))
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return -EFAULT;
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subd = (it.range_type >> 24) & 0xf;
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chan = (it.range_type >> 16) & 0xff;
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if (!dev->attached)
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return -EINVAL;
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if (subd >= dev->n_subdevices)
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return -EINVAL;
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s = dev->subdevices + subd;
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if (s->range_table) {
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lr = s->range_table;
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} else if (s->range_table_list) {
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if (chan >= s->n_chan)
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return -EINVAL;
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lr = s->range_table_list[chan];
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} else {
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return -EINVAL;
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}
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if (RANGE_LENGTH(it.range_type) != lr->length) {
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DPRINTK("wrong length %d should be %d (0x%08x)\n",
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RANGE_LENGTH(it.range_type), lr->length, it.range_type);
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return -EINVAL;
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}
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if (copy_to_user(it.range_ptr, lr->range,
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sizeof(comedi_krange) * lr->length))
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return -EFAULT;
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return 0;
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}
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static int aref_invalid(struct comedi_subdevice *s, unsigned int chanspec)
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{
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unsigned int aref;
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/* disable reporting invalid arefs... maybe someday */
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return 0;
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aref = CR_AREF(chanspec);
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switch (aref) {
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case AREF_DIFF:
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if (s->subdev_flags & SDF_DIFF)
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return 0;
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break;
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case AREF_COMMON:
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if (s->subdev_flags & SDF_COMMON)
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return 0;
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break;
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case AREF_GROUND:
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if (s->subdev_flags & SDF_GROUND)
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return 0;
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break;
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case AREF_OTHER:
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if (s->subdev_flags & SDF_OTHER)
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return 0;
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break;
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default:
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break;
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}
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DPRINTK("subdevice does not support aref %i", aref);
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return 1;
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}
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/*
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This function checks each element in a channel/gain list to make
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make sure it is valid.
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*/
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int check_chanlist(struct comedi_subdevice *s, int n, unsigned int *chanlist)
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{
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int i;
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int chan;
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if (s->range_table) {
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for (i = 0; i < n; i++)
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if (CR_CHAN(chanlist[i]) >= s->n_chan ||
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CR_RANGE(chanlist[i]) >= s->range_table->length
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|| aref_invalid(s, chanlist[i])) {
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rt_printk
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("bad chanlist[%d]=0x%08x n_chan=%d range length=%d\n",
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i, chanlist[i], s->n_chan,
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s->range_table->length);
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#if 0
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for (i = 0; i < n; i++)
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printk("[%d]=0x%08x\n", i, chanlist[i]);
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#endif
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return -EINVAL;
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}
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} else if (s->range_table_list) {
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for (i = 0; i < n; i++) {
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chan = CR_CHAN(chanlist[i]);
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if (chan >= s->n_chan ||
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CR_RANGE(chanlist[i]) >=
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s->range_table_list[chan]->length
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|| aref_invalid(s, chanlist[i])) {
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rt_printk("bad chanlist[%d]=0x%08x\n", i,
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chanlist[i]);
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return -EINVAL;
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}
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}
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} else {
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rt_printk("comedi: (bug) no range type list!\n");
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return -EINVAL;
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}
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return 0;
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}
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