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 "internal.h"
27
28 const struct comedi_lrange range_bipolar10 = { 1, {BIP_RANGE(10)} };
29 EXPORT_SYMBOL(range_bipolar10);
30 const struct comedi_lrange range_bipolar5 = { 1, {BIP_RANGE(5)} };
31 EXPORT_SYMBOL(range_bipolar5);
32 const struct comedi_lrange range_bipolar2_5 = { 1, {BIP_RANGE(2.5)} };
33 EXPORT_SYMBOL(range_bipolar2_5);
34 const struct comedi_lrange range_unipolar10 = { 1, {UNI_RANGE(10)} };
35 EXPORT_SYMBOL(range_unipolar10);
36 const struct comedi_lrange range_unipolar5 = { 1, {UNI_RANGE(5)} };
37 EXPORT_SYMBOL(range_unipolar5);
38 const struct comedi_lrange range_unknown = { 1, {{0, 1000000, UNIT_none} } };
39 EXPORT_SYMBOL(range_unknown);
40
41 /*
42 COMEDI_RANGEINFO
43 range information ioctl
44
45 arg:
46 pointer to rangeinfo structure
47
48 reads:
49 range info structure
50
51 writes:
52 n struct comedi_krange structures to rangeinfo->range_ptr
53 */
do_rangeinfo_ioctl(struct comedi_device * dev,struct comedi_rangeinfo __user * arg)54 int do_rangeinfo_ioctl(struct comedi_device *dev,
55 struct comedi_rangeinfo __user *arg)
56 {
57 struct comedi_rangeinfo it;
58 int subd, chan;
59 const struct comedi_lrange *lr;
60 struct comedi_subdevice *s;
61
62 if (copy_from_user(&it, arg, sizeof(struct comedi_rangeinfo)))
63 return -EFAULT;
64 subd = (it.range_type >> 24) & 0xf;
65 chan = (it.range_type >> 16) & 0xff;
66
67 if (!dev->attached)
68 return -EINVAL;
69 if (subd >= dev->n_subdevices)
70 return -EINVAL;
71 s = dev->subdevices + subd;
72 if (s->range_table) {
73 lr = s->range_table;
74 } else if (s->range_table_list) {
75 if (chan >= s->n_chan)
76 return -EINVAL;
77 lr = s->range_table_list[chan];
78 } else {
79 return -EINVAL;
80 }
81
82 if (RANGE_LENGTH(it.range_type) != lr->length) {
83 DPRINTK("wrong length %d should be %d (0x%08x)\n",
84 RANGE_LENGTH(it.range_type), lr->length, it.range_type);
85 return -EINVAL;
86 }
87
88 if (copy_to_user(it.range_ptr, lr->range,
89 sizeof(struct comedi_krange) * lr->length))
90 return -EFAULT;
91
92 return 0;
93 }
94
aref_invalid(struct comedi_subdevice * s,unsigned int chanspec)95 static int aref_invalid(struct comedi_subdevice *s, unsigned int chanspec)
96 {
97 unsigned int aref;
98
99 /* disable reporting invalid arefs... maybe someday */
100 return 0;
101
102 aref = CR_AREF(chanspec);
103 switch (aref) {
104 case AREF_DIFF:
105 if (s->subdev_flags & SDF_DIFF)
106 return 0;
107 break;
108 case AREF_COMMON:
109 if (s->subdev_flags & SDF_COMMON)
110 return 0;
111 break;
112 case AREF_GROUND:
113 if (s->subdev_flags & SDF_GROUND)
114 return 0;
115 break;
116 case AREF_OTHER:
117 if (s->subdev_flags & SDF_OTHER)
118 return 0;
119 break;
120 default:
121 break;
122 }
123 DPRINTK("subdevice does not support aref %i", aref);
124 return 1;
125 }
126
127 /*
128 This function checks each element in a channel/gain list to make
129 make sure it is valid.
130 */
comedi_check_chanlist(struct comedi_subdevice * s,int n,unsigned int * chanlist)131 int comedi_check_chanlist(struct comedi_subdevice *s, int n,
132 unsigned int *chanlist)
133 {
134 int i;
135 int chan;
136
137 if (s->range_table) {
138 for (i = 0; i < n; i++)
139 if (CR_CHAN(chanlist[i]) >= s->n_chan ||
140 CR_RANGE(chanlist[i]) >= s->range_table->length
141 || aref_invalid(s, chanlist[i])) {
142 printk(KERN_ERR "bad chanlist[%d]=0x%08x "
143 "in_chan=%d range length=%d\n", i,
144 chanlist[i], s->n_chan,
145 s->range_table->length);
146 return -EINVAL;
147 }
148 } else if (s->range_table_list) {
149 for (i = 0; i < n; i++) {
150 chan = CR_CHAN(chanlist[i]);
151 if (chan >= s->n_chan ||
152 CR_RANGE(chanlist[i]) >=
153 s->range_table_list[chan]->length
154 || aref_invalid(s, chanlist[i])) {
155 printk(KERN_ERR "bad chanlist[%d]=0x%08x\n",
156 i, chanlist[i]);
157 return -EINVAL;
158 }
159 }
160 } else {
161 printk(KERN_ERR "comedi: (bug) no range type list!\n");
162 return -EINVAL;
163 }
164 return 0;
165 }
166 EXPORT_SYMBOL(comedi_check_chanlist);
167