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.
19 #include <linux/uaccess.h>
20 #include "comedidev.h"
21 #include "comedi_internal.h"
23 const struct comedi_lrange range_bipolar10 = { 1, {BIP_RANGE(10)} };
24 EXPORT_SYMBOL_GPL(range_bipolar10);
25 const struct comedi_lrange range_bipolar5 = { 1, {BIP_RANGE(5)} };
26 EXPORT_SYMBOL_GPL(range_bipolar5);
27 const struct comedi_lrange range_bipolar2_5 = { 1, {BIP_RANGE(2.5)} };
28 EXPORT_SYMBOL_GPL(range_bipolar2_5);
29 const struct comedi_lrange range_unipolar10 = { 1, {UNI_RANGE(10)} };
30 EXPORT_SYMBOL_GPL(range_unipolar10);
31 const struct comedi_lrange range_unipolar5 = { 1, {UNI_RANGE(5)} };
32 EXPORT_SYMBOL_GPL(range_unipolar5);
33 const struct comedi_lrange range_unipolar2_5 = { 1, {UNI_RANGE(2.5)} };
34 EXPORT_SYMBOL_GPL(range_unipolar2_5);
35 const struct comedi_lrange range_0_20mA = { 1, {RANGE_mA(0, 20)} };
36 EXPORT_SYMBOL_GPL(range_0_20mA);
37 const struct comedi_lrange range_4_20mA = { 1, {RANGE_mA(4, 20)} };
38 EXPORT_SYMBOL_GPL(range_4_20mA);
39 const struct comedi_lrange range_0_32mA = { 1, {RANGE_mA(0, 32)} };
40 EXPORT_SYMBOL_GPL(range_0_32mA);
41 const struct comedi_lrange range_unknown = { 1, {{0, 1000000, UNIT_none} } };
42 EXPORT_SYMBOL_GPL(range_unknown);
46 range information ioctl
49 pointer to rangeinfo structure
55 n struct comedi_krange structures to rangeinfo->range_ptr
57 int do_rangeinfo_ioctl(struct comedi_device *dev,
58 struct comedi_rangeinfo __user *arg)
60 struct comedi_rangeinfo it;
62 const struct comedi_lrange *lr;
63 struct comedi_subdevice *s;
65 if (copy_from_user(&it, arg, sizeof(struct comedi_rangeinfo)))
67 subd = (it.range_type >> 24) & 0xf;
68 chan = (it.range_type >> 16) & 0xff;
72 if (subd >= dev->n_subdevices)
74 s = &dev->subdevices[subd];
77 } else if (s->range_table_list) {
78 if (chan >= s->n_chan)
80 lr = s->range_table_list[chan];
85 if (RANGE_LENGTH(it.range_type) != lr->length) {
86 DPRINTK("wrong length %d should be %d (0x%08x)\n",
87 RANGE_LENGTH(it.range_type), lr->length, it.range_type);
91 if (copy_to_user(it.range_ptr, lr->range,
92 sizeof(struct comedi_krange) * lr->length))
98 static int aref_invalid(struct comedi_subdevice *s, unsigned int chanspec)
102 /* disable reporting invalid arefs... maybe someday */
105 aref = CR_AREF(chanspec);
108 if (s->subdev_flags & SDF_DIFF)
112 if (s->subdev_flags & SDF_COMMON)
116 if (s->subdev_flags & SDF_GROUND)
120 if (s->subdev_flags & SDF_OTHER)
126 DPRINTK("subdevice does not support aref %i", aref);
131 This function checks each element in a channel/gain list to make
132 make sure it is valid.
134 int comedi_check_chanlist(struct comedi_subdevice *s, int n,
135 unsigned int *chanlist)
137 struct comedi_device *dev = s->device;
141 if (s->range_table) {
142 for (i = 0; i < n; i++)
143 if (CR_CHAN(chanlist[i]) >= s->n_chan ||
144 CR_RANGE(chanlist[i]) >= s->range_table->length
145 || aref_invalid(s, chanlist[i])) {
146 dev_warn(dev->class_dev,
147 "bad chanlist[%d]=0x%08x in_chan=%d range length=%d\n",
148 i, chanlist[i], s->n_chan,
149 s->range_table->length);
152 } else if (s->range_table_list) {
153 for (i = 0; i < n; i++) {
154 chan = CR_CHAN(chanlist[i]);
155 if (chan >= s->n_chan ||
156 CR_RANGE(chanlist[i]) >=
157 s->range_table_list[chan]->length
158 || aref_invalid(s, chanlist[i])) {
159 dev_warn(dev->class_dev,
160 "bad chanlist[%d]=0x%08x\n",
166 dev_err(dev->class_dev, "(bug) no range type list!\n");
171 EXPORT_SYMBOL_GPL(comedi_check_chanlist);