Commit | Line | Data |
---|---|---|
ed9eccbe DS |
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 "comedidev.h" | |
ecfe20db | 25 | #include <linux/uaccess.h> |
ed9eccbe | 26 | |
9ced1de6 | 27 | const struct comedi_lrange range_bipolar10 = { 1, {BIP_RANGE(10)} }; |
e4231517 | 28 | EXPORT_SYMBOL(range_bipolar10); |
f0f29184 | 29 | const struct comedi_lrange range_bipolar5 = { 1, {BIP_RANGE(5)} }; |
e4231517 | 30 | EXPORT_SYMBOL(range_bipolar5); |
f0f29184 | 31 | const struct comedi_lrange range_bipolar2_5 = { 1, {BIP_RANGE(2.5)} }; |
e4231517 | 32 | EXPORT_SYMBOL(range_bipolar2_5); |
f0f29184 | 33 | const struct comedi_lrange range_unipolar10 = { 1, {UNI_RANGE(10)} }; |
e4231517 | 34 | EXPORT_SYMBOL(range_unipolar10); |
f0f29184 | 35 | const struct comedi_lrange range_unipolar5 = { 1, {UNI_RANGE(5)} }; |
e4231517 | 36 | EXPORT_SYMBOL(range_unipolar5); |
f0f29184 | 37 | const struct comedi_lrange range_unknown = { 1, {{0, 1000000, UNIT_none} } }; |
e4231517 | 38 | EXPORT_SYMBOL(range_unknown); |
ed9eccbe DS |
39 | |
40 | /* | |
356cdbcb | 41 | COMEDI_RANGEINFO |
ed9eccbe DS |
42 | range information ioctl |
43 | ||
44 | arg: | |
45 | pointer to rangeinfo structure | |
46 | ||
47 | reads: | |
48 | range info structure | |
49 | ||
50 | writes: | |
1f6325d6 | 51 | n struct comedi_krange structures to rangeinfo->range_ptr |
ed9eccbe | 52 | */ |
d0a353f6 | 53 | int do_rangeinfo_ioctl(struct comedi_device *dev, struct comedi_rangeinfo *arg) |
ed9eccbe | 54 | { |
d0a353f6 | 55 | struct comedi_rangeinfo it; |
ed9eccbe | 56 | int subd, chan; |
9ced1de6 | 57 | const struct comedi_lrange *lr; |
34c43922 | 58 | struct comedi_subdevice *s; |
ed9eccbe | 59 | |
d0a353f6 | 60 | if (copy_from_user(&it, arg, sizeof(struct comedi_rangeinfo))) |
ed9eccbe DS |
61 | return -EFAULT; |
62 | subd = (it.range_type >> 24) & 0xf; | |
63 | chan = (it.range_type >> 16) & 0xff; | |
64 | ||
65 | if (!dev->attached) | |
66 | return -EINVAL; | |
67 | if (subd >= dev->n_subdevices) | |
68 | return -EINVAL; | |
69 | s = dev->subdevices + subd; | |
70 | if (s->range_table) { | |
71 | lr = s->range_table; | |
72 | } else if (s->range_table_list) { | |
73 | if (chan >= s->n_chan) | |
74 | return -EINVAL; | |
75 | lr = s->range_table_list[chan]; | |
76 | } else { | |
77 | return -EINVAL; | |
78 | } | |
79 | ||
80 | if (RANGE_LENGTH(it.range_type) != lr->length) { | |
81 | DPRINTK("wrong length %d should be %d (0x%08x)\n", | |
82 | RANGE_LENGTH(it.range_type), lr->length, it.range_type); | |
83 | return -EINVAL; | |
84 | } | |
85 | ||
86 | if (copy_to_user(it.range_ptr, lr->range, | |
0a85b6f0 | 87 | sizeof(struct comedi_krange) * lr->length)) |
ed9eccbe DS |
88 | return -EFAULT; |
89 | ||
90 | return 0; | |
91 | } | |
92 | ||
34c43922 | 93 | static int aref_invalid(struct comedi_subdevice *s, unsigned int chanspec) |
ed9eccbe DS |
94 | { |
95 | unsigned int aref; | |
96 | ||
b6c77757 | 97 | /* disable reporting invalid arefs... maybe someday */ |
ed9eccbe DS |
98 | return 0; |
99 | ||
100 | aref = CR_AREF(chanspec); | |
101 | switch (aref) { | |
102 | case AREF_DIFF: | |
103 | if (s->subdev_flags & SDF_DIFF) | |
104 | return 0; | |
105 | break; | |
106 | case AREF_COMMON: | |
107 | if (s->subdev_flags & SDF_COMMON) | |
108 | return 0; | |
109 | break; | |
110 | case AREF_GROUND: | |
111 | if (s->subdev_flags & SDF_GROUND) | |
112 | return 0; | |
113 | break; | |
114 | case AREF_OTHER: | |
115 | if (s->subdev_flags & SDF_OTHER) | |
116 | return 0; | |
117 | break; | |
118 | default: | |
119 | break; | |
120 | } | |
121 | DPRINTK("subdevice does not support aref %i", aref); | |
122 | return 1; | |
123 | } | |
124 | ||
125 | /* | |
126 | This function checks each element in a channel/gain list to make | |
127 | make sure it is valid. | |
128 | */ | |
0fd0ca75 GKH |
129 | int comedi_check_chanlist(struct comedi_subdevice *s, int n, |
130 | unsigned int *chanlist) | |
ed9eccbe DS |
131 | { |
132 | int i; | |
133 | int chan; | |
134 | ||
135 | if (s->range_table) { | |
136 | for (i = 0; i < n; i++) | |
137 | if (CR_CHAN(chanlist[i]) >= s->n_chan || | |
0a85b6f0 MT |
138 | CR_RANGE(chanlist[i]) >= s->range_table->length |
139 | || aref_invalid(s, chanlist[i])) { | |
ecfe20db GKH |
140 | printk(KERN_ERR "bad chanlist[%d]=0x%08x " |
141 | "in_chan=%d range length=%d\n", i, | |
142 | chanlist[i], s->n_chan, | |
143 | s->range_table->length); | |
ed9eccbe DS |
144 | return -EINVAL; |
145 | } | |
146 | } else if (s->range_table_list) { | |
147 | for (i = 0; i < n; i++) { | |
148 | chan = CR_CHAN(chanlist[i]); | |
149 | if (chan >= s->n_chan || | |
0a85b6f0 MT |
150 | CR_RANGE(chanlist[i]) >= |
151 | s->range_table_list[chan]->length | |
152 | || aref_invalid(s, chanlist[i])) { | |
ecfe20db GKH |
153 | printk(KERN_ERR "bad chanlist[%d]=0x%08x\n", |
154 | i, chanlist[i]); | |
ed9eccbe DS |
155 | return -EINVAL; |
156 | } | |
157 | } | |
158 | } else { | |
ecfe20db | 159 | printk(KERN_ERR "comedi: (bug) no range type list!\n"); |
ed9eccbe DS |
160 | return -EINVAL; |
161 | } | |
162 | return 0; | |
163 | } | |
0fd0ca75 | 164 | EXPORT_SYMBOL(comedi_check_chanlist); |