1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
|
/*
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 <linux/uaccess.h>
const struct comedi_lrange range_bipolar10 = { 1, {BIP_RANGE(10)} };
const struct comedi_lrange range_bipolar5 = { 1, {BIP_RANGE(5)} };
const struct comedi_lrange range_bipolar2_5 = { 1, {BIP_RANGE(2.5)} };
const struct comedi_lrange range_unipolar10 = { 1, {UNI_RANGE(10)} };
const struct comedi_lrange range_unipolar5 = { 1, {UNI_RANGE(5)} };
const struct comedi_lrange range_unknown = { 1, {{0, 1000000, UNIT_none} } };
EXPORT_SYMBOL(range_bipolar10);
EXPORT_SYMBOL(range_bipolar5);
EXPORT_SYMBOL(range_bipolar2_5);
EXPORT_SYMBOL(range_unipolar10);
EXPORT_SYMBOL(range_unipolar5);
EXPORT_SYMBOL(range_unknown);
/*
COMEDI_RANGEINFO
range information ioctl
arg:
pointer to rangeinfo structure
reads:
range info structure
writes:
n struct comedi_krange structures to rangeinfo->range_ptr
*/
int do_rangeinfo_ioctl(struct comedi_device *dev, struct comedi_rangeinfo *arg)
{
struct comedi_rangeinfo it;
int subd, chan;
const struct comedi_lrange *lr;
struct comedi_subdevice *s;
if (copy_from_user(&it, arg, sizeof(struct 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(struct comedi_krange) * lr->length))
return -EFAULT;
return 0;
}
static int aref_invalid(struct 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(struct 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])) {
printk(KERN_ERR "bad chanlist[%d]=0x%08x "
"in_chan=%d range length=%d\n", i,
chanlist[i], s->n_chan,
s->range_table->length);
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])) {
printk(KERN_ERR "bad chanlist[%d]=0x%08x\n",
i, chanlist[i]);
return -EINVAL;
}
}
} else {
printk(KERN_ERR "comedi: (bug) no range type list!\n");
return -EINVAL;
}
return 0;
}
|
