3 comedi routines for voltage ranges
5 COMEDI - Linux Control and Measurement Device Interface
6 Copyright (C) 1997-8 David A. Schleef <ds@schleef.org>
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 #include <linux/uaccess.h>
25 #include "comedidev.h"
26 #include "comedi_internal.h"
28 const struct comedi_lrange range_bipolar10 = { 1, {BIP_RANGE(10)} };
29 EXPORT_SYMBOL_GPL(range_bipolar10);
30 const struct comedi_lrange range_bipolar5 = { 1, {BIP_RANGE(5)} };
31 EXPORT_SYMBOL_GPL(range_bipolar5);
32 const struct comedi_lrange range_bipolar2_5 = { 1, {BIP_RANGE(2.5)} };
33 EXPORT_SYMBOL_GPL(range_bipolar2_5);
34 const struct comedi_lrange range_unipolar10 = { 1, {UNI_RANGE(10)} };
35 EXPORT_SYMBOL_GPL(range_unipolar10);
36 const struct comedi_lrange range_unipolar5 = { 1, {UNI_RANGE(5)} };
37 EXPORT_SYMBOL_GPL(range_unipolar5);
38 const struct comedi_lrange range_unipolar2_5 = { 1, {UNI_RANGE(2.5)} };
39 EXPORT_SYMBOL_GPL(range_unipolar2_5);
40 const struct comedi_lrange range_0_20mA = { 1, {RANGE_mA(0, 20)} };
41 EXPORT_SYMBOL_GPL(range_0_20mA);
42 const struct comedi_lrange range_4_20mA = { 1, {RANGE_mA(4, 20)} };
43 EXPORT_SYMBOL_GPL(range_4_20mA);
44 const struct comedi_lrange range_0_32mA = { 1, {RANGE_mA(0, 32)} };
45 EXPORT_SYMBOL_GPL(range_0_32mA);
46 const struct comedi_lrange range_unknown = { 1, {{0, 1000000, UNIT_none} } };
47 EXPORT_SYMBOL_GPL(range_unknown);
51 range information ioctl
54 pointer to rangeinfo structure
60 n struct comedi_krange structures to rangeinfo->range_ptr
62 int do_rangeinfo_ioctl(struct comedi_device *dev,
63 struct comedi_rangeinfo __user *arg)
65 struct comedi_rangeinfo it;
67 const struct comedi_lrange *lr;
68 struct comedi_subdevice *s;
70 if (copy_from_user(&it, arg, sizeof(struct comedi_rangeinfo)))
72 subd = (it.range_type >> 24) & 0xf;
73 chan = (it.range_type >> 16) & 0xff;
77 if (subd >= dev->n_subdevices)
79 s = &dev->subdevices[subd];
82 } else if (s->range_table_list) {
83 if (chan >= s->n_chan)
85 lr = s->range_table_list[chan];
90 if (RANGE_LENGTH(it.range_type) != lr->length) {
91 DPRINTK("wrong length %d should be %d (0x%08x)\n",
92 RANGE_LENGTH(it.range_type), lr->length, it.range_type);
96 if (copy_to_user(it.range_ptr, lr->range,
97 sizeof(struct comedi_krange) * lr->length))
103 static int aref_invalid(struct comedi_subdevice *s, unsigned int chanspec)
107 /* disable reporting invalid arefs... maybe someday */
110 aref = CR_AREF(chanspec);
113 if (s->subdev_flags & SDF_DIFF)
117 if (s->subdev_flags & SDF_COMMON)
121 if (s->subdev_flags & SDF_GROUND)
125 if (s->subdev_flags & SDF_OTHER)
131 DPRINTK("subdevice does not support aref %i", aref);
136 This function checks each element in a channel/gain list to make
137 make sure it is valid.
139 int comedi_check_chanlist(struct comedi_subdevice *s, int n,
140 unsigned int *chanlist)
142 struct comedi_device *dev = s->device;
146 if (s->range_table) {
147 for (i = 0; i < n; i++)
148 if (CR_CHAN(chanlist[i]) >= s->n_chan ||
149 CR_RANGE(chanlist[i]) >= s->range_table->length
150 || aref_invalid(s, chanlist[i])) {
151 dev_warn(dev->class_dev,
152 "bad chanlist[%d]=0x%08x in_chan=%d range length=%d\n",
153 i, chanlist[i], s->n_chan,
154 s->range_table->length);
157 } else if (s->range_table_list) {
158 for (i = 0; i < n; i++) {
159 chan = CR_CHAN(chanlist[i]);
160 if (chan >= s->n_chan ||
161 CR_RANGE(chanlist[i]) >=
162 s->range_table_list[chan]->length
163 || aref_invalid(s, chanlist[i])) {
164 dev_warn(dev->class_dev,
165 "bad chanlist[%d]=0x%08x\n",
171 dev_err(dev->class_dev, "(bug) no range type list!\n");
176 EXPORT_SYMBOL_GPL(comedi_check_chanlist);