1 /*
2 module/range.c
3 comedi routines for voltage ranges
4
5 COMEDI - Linux Control and Measurement Device Interface
6 Copyright (C) 1997-8 David A. Schleef <ds@schleef.org>
7
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.
12
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.
17
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.
21
22 */
23
24 #include <linux/uaccess.h>
25 #include "comedidev.h"
26 #include "comedi_internal.h"
27
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);
48
49 /*
50 COMEDI_RANGEINFO
51 range information ioctl
52
53 arg:
54 pointer to rangeinfo structure
55
56 reads:
57 range info structure
58
59 writes:
60 n struct comedi_krange structures to rangeinfo->range_ptr
61 */
do_rangeinfo_ioctl(struct comedi_device * dev,struct comedi_rangeinfo __user * arg)62 int do_rangeinfo_ioctl(struct comedi_device *dev,
63 struct comedi_rangeinfo __user *arg)
64 {
65 struct comedi_rangeinfo it;
66 int subd, chan;
67 const struct comedi_lrange *lr;
68 struct comedi_subdevice *s;
69
70 if (copy_from_user(&it, arg, sizeof(struct comedi_rangeinfo)))
71 return -EFAULT;
72 subd = (it.range_type >> 24) & 0xf;
73 chan = (it.range_type >> 16) & 0xff;
74
75 if (!dev->attached)
76 return -EINVAL;
77 if (subd >= dev->n_subdevices)
78 return -EINVAL;
79 s = &dev->subdevices[subd];
80 if (s->range_table) {
81 lr = s->range_table;
82 } else if (s->range_table_list) {
83 if (chan >= s->n_chan)
84 return -EINVAL;
85 lr = s->range_table_list[chan];
86 } else {
87 return -EINVAL;
88 }
89
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);
93 return -EINVAL;
94 }
95
96 if (copy_to_user(it.range_ptr, lr->range,
97 sizeof(struct comedi_krange) * lr->length))
98 return -EFAULT;
99
100 return 0;
101 }
102
aref_invalid(struct comedi_subdevice * s,unsigned int chanspec)103 static int aref_invalid(struct comedi_subdevice *s, unsigned int chanspec)
104 {
105 unsigned int aref;
106
107 /* disable reporting invalid arefs... maybe someday */
108 return 0;
109
110 aref = CR_AREF(chanspec);
111 switch (aref) {
112 case AREF_DIFF:
113 if (s->subdev_flags & SDF_DIFF)
114 return 0;
115 break;
116 case AREF_COMMON:
117 if (s->subdev_flags & SDF_COMMON)
118 return 0;
119 break;
120 case AREF_GROUND:
121 if (s->subdev_flags & SDF_GROUND)
122 return 0;
123 break;
124 case AREF_OTHER:
125 if (s->subdev_flags & SDF_OTHER)
126 return 0;
127 break;
128 default:
129 break;
130 }
131 DPRINTK("subdevice does not support aref %i", aref);
132 return 1;
133 }
134
135 /*
136 This function checks each element in a channel/gain list to make
137 make sure it is valid.
138 */
comedi_check_chanlist(struct comedi_subdevice * s,int n,unsigned int * chanlist)139 int comedi_check_chanlist(struct comedi_subdevice *s, int n,
140 unsigned int *chanlist)
141 {
142 struct comedi_device *dev = s->device;
143 int i;
144 int chan;
145
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);
155 return -EINVAL;
156 }
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",
166 i, chanlist[i]);
167 return -EINVAL;
168 }
169 }
170 } else {
171 dev_err(dev->class_dev, "(bug) no range type list!\n");
172 return -EINVAL;
173 }
174 return 0;
175 }
176 EXPORT_SYMBOL_GPL(comedi_check_chanlist);
177