Commit | Line | Data |
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e184e2be | 1 | // SPDX-License-Identifier: GPL-2.0+ |
ed9eccbe | 2 | /* |
5824ec7f IA |
3 | * comedi/range.c |
4 | * comedi routines for voltage ranges | |
5 | * | |
6 | * COMEDI - Linux Control and Measurement Device Interface | |
7 | * Copyright (C) 1997-8 David A. Schleef <ds@schleef.org> | |
5824ec7f | 8 | */ |
ed9eccbe | 9 | |
ecfe20db | 10 | #include <linux/uaccess.h> |
3b6b25b5 | 11 | #include "comedidev.h" |
3a5fa275 | 12 | #include "comedi_internal.h" |
ed9eccbe | 13 | |
9ced1de6 | 14 | const struct comedi_lrange range_bipolar10 = { 1, {BIP_RANGE(10)} }; |
5660e742 | 15 | EXPORT_SYMBOL_GPL(range_bipolar10); |
f0f29184 | 16 | const struct comedi_lrange range_bipolar5 = { 1, {BIP_RANGE(5)} }; |
5660e742 | 17 | EXPORT_SYMBOL_GPL(range_bipolar5); |
f0f29184 | 18 | const struct comedi_lrange range_bipolar2_5 = { 1, {BIP_RANGE(2.5)} }; |
5660e742 | 19 | EXPORT_SYMBOL_GPL(range_bipolar2_5); |
f0f29184 | 20 | const struct comedi_lrange range_unipolar10 = { 1, {UNI_RANGE(10)} }; |
5660e742 | 21 | EXPORT_SYMBOL_GPL(range_unipolar10); |
f0f29184 | 22 | const struct comedi_lrange range_unipolar5 = { 1, {UNI_RANGE(5)} }; |
5660e742 | 23 | EXPORT_SYMBOL_GPL(range_unipolar5); |
5f8eb72c | 24 | const struct comedi_lrange range_unipolar2_5 = { 1, {UNI_RANGE(2.5)} }; |
5660e742 | 25 | EXPORT_SYMBOL_GPL(range_unipolar2_5); |
2c71c4ff | 26 | const struct comedi_lrange range_0_20mA = { 1, {RANGE_mA(0, 20)} }; |
5660e742 | 27 | EXPORT_SYMBOL_GPL(range_0_20mA); |
2c71c4ff | 28 | const struct comedi_lrange range_4_20mA = { 1, {RANGE_mA(4, 20)} }; |
5660e742 | 29 | EXPORT_SYMBOL_GPL(range_4_20mA); |
2c71c4ff | 30 | const struct comedi_lrange range_0_32mA = { 1, {RANGE_mA(0, 32)} }; |
5660e742 | 31 | EXPORT_SYMBOL_GPL(range_0_32mA); |
f0f29184 | 32 | const struct comedi_lrange range_unknown = { 1, {{0, 1000000, UNIT_none} } }; |
5660e742 | 33 | EXPORT_SYMBOL_GPL(range_unknown); |
ed9eccbe DS |
34 | |
35 | /* | |
1a4f01b7 IA |
36 | * COMEDI_RANGEINFO ioctl |
37 | * range information | |
38 | * | |
39 | * arg: | |
40 | * pointer to comedi_rangeinfo structure | |
41 | * | |
42 | * reads: | |
43 | * comedi_rangeinfo structure | |
44 | * | |
45 | * writes: | |
46 | * array of comedi_krange structures to rangeinfo->range_ptr pointer | |
47 | */ | |
3b6b25b5 | 48 | int do_rangeinfo_ioctl(struct comedi_device *dev, |
38813876 | 49 | struct comedi_rangeinfo *it) |
ed9eccbe | 50 | { |
ed9eccbe | 51 | int subd, chan; |
9ced1de6 | 52 | const struct comedi_lrange *lr; |
34c43922 | 53 | struct comedi_subdevice *s; |
ed9eccbe | 54 | |
38813876 AV |
55 | subd = (it->range_type >> 24) & 0xf; |
56 | chan = (it->range_type >> 16) & 0xff; | |
ed9eccbe DS |
57 | |
58 | if (!dev->attached) | |
59 | return -EINVAL; | |
60 | if (subd >= dev->n_subdevices) | |
61 | return -EINVAL; | |
d08d6cfe | 62 | s = &dev->subdevices[subd]; |
ed9eccbe DS |
63 | if (s->range_table) { |
64 | lr = s->range_table; | |
65 | } else if (s->range_table_list) { | |
66 | if (chan >= s->n_chan) | |
67 | return -EINVAL; | |
68 | lr = s->range_table_list[chan]; | |
69 | } else { | |
70 | return -EINVAL; | |
71 | } | |
72 | ||
38813876 | 73 | if (RANGE_LENGTH(it->range_type) != lr->length) { |
2cde476d HS |
74 | dev_dbg(dev->class_dev, |
75 | "wrong length %d should be %d (0x%08x)\n", | |
38813876 AV |
76 | RANGE_LENGTH(it->range_type), |
77 | lr->length, it->range_type); | |
ed9eccbe DS |
78 | return -EINVAL; |
79 | } | |
80 | ||
38813876 | 81 | if (copy_to_user(it->range_ptr, lr->range, |
0a85b6f0 | 82 | sizeof(struct comedi_krange) * lr->length)) |
ed9eccbe DS |
83 | return -EFAULT; |
84 | ||
85 | return 0; | |
86 | } | |
87 | ||
065b0912 HS |
88 | /** |
89 | * comedi_check_chanlist() - Validate each element in a chanlist. | |
90 | * @s: comedi_subdevice struct | |
91 | * @n: number of elements in the chanlist | |
92 | * @chanlist: the chanlist to validate | |
d27da4da IA |
93 | * |
94 | * Each element consists of a channel number, a range index, an analog | |
95 | * reference type and some flags, all packed into an unsigned int. | |
96 | * | |
97 | * This checks that the channel number and range index are supported by | |
98 | * the comedi subdevice. It does not check whether the analog reference | |
99 | * type and the flags are supported. Drivers that care should check those | |
100 | * themselves. | |
101 | * | |
102 | * Return: %0 if all @chanlist elements are valid (success), | |
103 | * %-EINVAL if one or more elements are invalid. | |
104 | */ | |
0fd0ca75 GKH |
105 | int comedi_check_chanlist(struct comedi_subdevice *s, int n, |
106 | unsigned int *chanlist) | |
ed9eccbe | 107 | { |
4f870fe6 | 108 | struct comedi_device *dev = s->device; |
065b0912 HS |
109 | unsigned int chanspec; |
110 | int chan, range_len, i; | |
ed9eccbe | 111 | |
afdc37ee FA |
112 | for (i = 0; i < n; i++) { |
113 | chanspec = chanlist[i]; | |
114 | chan = CR_CHAN(chanspec); | |
115 | if (s->range_table) | |
116 | range_len = s->range_table->length; | |
117 | else if (s->range_table_list && chan < s->n_chan) | |
118 | range_len = s->range_table_list[chan]->length; | |
119 | else | |
120 | range_len = 0; | |
121 | if (chan >= s->n_chan || | |
c6c04f05 | 122 | CR_RANGE(chanspec) >= range_len) { |
afdc37ee FA |
123 | dev_warn(dev->class_dev, |
124 | "bad chanlist[%d]=0x%08x chan=%d range length=%d\n", | |
125 | i, chanspec, chan, range_len); | |
126 | return -EINVAL; | |
127 | } | |
128 | } | |
ed9eccbe DS |
129 | return 0; |
130 | } | |
5660e742 | 131 | EXPORT_SYMBOL_GPL(comedi_check_chanlist); |