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24#include <linux/uaccess.h>
25#include "comedidev.h"
26#include "internal.h"
27
28const struct comedi_lrange range_bipolar10 = { 1, {BIP_RANGE(10)} };
29EXPORT_SYMBOL(range_bipolar10);
30const struct comedi_lrange range_bipolar5 = { 1, {BIP_RANGE(5)} };
31EXPORT_SYMBOL(range_bipolar5);
32const struct comedi_lrange range_bipolar2_5 = { 1, {BIP_RANGE(2.5)} };
33EXPORT_SYMBOL(range_bipolar2_5);
34const struct comedi_lrange range_unipolar10 = { 1, {UNI_RANGE(10)} };
35EXPORT_SYMBOL(range_unipolar10);
36const struct comedi_lrange range_unipolar5 = { 1, {UNI_RANGE(5)} };
37EXPORT_SYMBOL(range_unipolar5);
38const struct comedi_lrange range_unknown = { 1, {{0, 1000000, UNIT_none} } };
39EXPORT_SYMBOL(range_unknown);
40
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45
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51
52
53
54int 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
95static int aref_invalid(struct comedi_subdevice *s, unsigned int chanspec)
96{
97 unsigned int aref;
98
99
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
129
130
131int 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}
166EXPORT_SYMBOL(comedi_check_chanlist);
167