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 | ||
ecfe20db | 24 | #include <linux/uaccess.h> |
3b6b25b5 | 25 | #include "comedidev.h" |
3a5fa275 | 26 | #include "comedi_internal.h" |
ed9eccbe | 27 | |
9ced1de6 | 28 | const struct comedi_lrange range_bipolar10 = { 1, {BIP_RANGE(10)} }; |
5660e742 | 29 | EXPORT_SYMBOL_GPL(range_bipolar10); |
f0f29184 | 30 | const struct comedi_lrange range_bipolar5 = { 1, {BIP_RANGE(5)} }; |
5660e742 | 31 | EXPORT_SYMBOL_GPL(range_bipolar5); |
f0f29184 | 32 | const struct comedi_lrange range_bipolar2_5 = { 1, {BIP_RANGE(2.5)} }; |
5660e742 | 33 | EXPORT_SYMBOL_GPL(range_bipolar2_5); |
f0f29184 | 34 | const struct comedi_lrange range_unipolar10 = { 1, {UNI_RANGE(10)} }; |
5660e742 | 35 | EXPORT_SYMBOL_GPL(range_unipolar10); |
f0f29184 | 36 | const struct comedi_lrange range_unipolar5 = { 1, {UNI_RANGE(5)} }; |
5660e742 | 37 | EXPORT_SYMBOL_GPL(range_unipolar5); |
5f8eb72c | 38 | const struct comedi_lrange range_unipolar2_5 = { 1, {UNI_RANGE(2.5)} }; |
5660e742 | 39 | EXPORT_SYMBOL_GPL(range_unipolar2_5); |
2c71c4ff | 40 | const struct comedi_lrange range_0_20mA = { 1, {RANGE_mA(0, 20)} }; |
5660e742 | 41 | EXPORT_SYMBOL_GPL(range_0_20mA); |
2c71c4ff | 42 | const struct comedi_lrange range_4_20mA = { 1, {RANGE_mA(4, 20)} }; |
5660e742 | 43 | EXPORT_SYMBOL_GPL(range_4_20mA); |
2c71c4ff | 44 | const struct comedi_lrange range_0_32mA = { 1, {RANGE_mA(0, 32)} }; |
5660e742 | 45 | EXPORT_SYMBOL_GPL(range_0_32mA); |
f0f29184 | 46 | const struct comedi_lrange range_unknown = { 1, {{0, 1000000, UNIT_none} } }; |
5660e742 | 47 | EXPORT_SYMBOL_GPL(range_unknown); |
ed9eccbe DS |
48 | |
49 | /* | |
356cdbcb | 50 | COMEDI_RANGEINFO |
ed9eccbe DS |
51 | range information ioctl |
52 | ||
53 | arg: | |
54 | pointer to rangeinfo structure | |
55 | ||
56 | reads: | |
57 | range info structure | |
58 | ||
59 | writes: | |
1f6325d6 | 60 | n struct comedi_krange structures to rangeinfo->range_ptr |
ed9eccbe | 61 | */ |
3b6b25b5 GKH |
62 | int do_rangeinfo_ioctl(struct comedi_device *dev, |
63 | struct comedi_rangeinfo __user *arg) | |
ed9eccbe | 64 | { |
d0a353f6 | 65 | struct comedi_rangeinfo it; |
ed9eccbe | 66 | int subd, chan; |
9ced1de6 | 67 | const struct comedi_lrange *lr; |
34c43922 | 68 | struct comedi_subdevice *s; |
ed9eccbe | 69 | |
d0a353f6 | 70 | if (copy_from_user(&it, arg, sizeof(struct comedi_rangeinfo))) |
ed9eccbe DS |
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; | |
d08d6cfe | 79 | s = &dev->subdevices[subd]; |
ed9eccbe DS |
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, | |
0a85b6f0 | 97 | sizeof(struct comedi_krange) * lr->length)) |
ed9eccbe DS |
98 | return -EFAULT; |
99 | ||
100 | return 0; | |
101 | } | |
102 | ||
34c43922 | 103 | static int aref_invalid(struct comedi_subdevice *s, unsigned int chanspec) |
ed9eccbe DS |
104 | { |
105 | unsigned int aref; | |
106 | ||
b6c77757 | 107 | /* disable reporting invalid arefs... maybe someday */ |
ed9eccbe DS |
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 | */ | |
0fd0ca75 GKH |
139 | int comedi_check_chanlist(struct comedi_subdevice *s, int n, |
140 | unsigned int *chanlist) | |
ed9eccbe | 141 | { |
4f870fe6 | 142 | struct comedi_device *dev = s->device; |
ed9eccbe DS |
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 || | |
0a85b6f0 MT |
149 | CR_RANGE(chanlist[i]) >= s->range_table->length |
150 | || aref_invalid(s, chanlist[i])) { | |
4f870fe6 IA |
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); | |
ed9eccbe DS |
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 || | |
0a85b6f0 MT |
161 | CR_RANGE(chanlist[i]) >= |
162 | s->range_table_list[chan]->length | |
163 | || aref_invalid(s, chanlist[i])) { | |
4f870fe6 IA |
164 | dev_warn(dev->class_dev, |
165 | "bad chanlist[%d]=0x%08x\n", | |
166 | i, chanlist[i]); | |
ed9eccbe DS |
167 | return -EINVAL; |
168 | } | |
169 | } | |
170 | } else { | |
4f870fe6 | 171 | dev_err(dev->class_dev, "(bug) no range type list!\n"); |
ed9eccbe DS |
172 | return -EINVAL; |
173 | } | |
174 | return 0; | |
175 | } | |
5660e742 | 176 | EXPORT_SYMBOL_GPL(comedi_check_chanlist); |