blob: 474af7bc6c8bfe6f593533b33ca202bada8a7d50 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
|
#include "../comedidev.h"
#include "pcm_common.h"
/*
* 'do_cmdtest' function for an 'INTERRUPT' subdevice. This is for
* the PCM drivers.
*/
int comedi_pcm_cmdtest(struct comedi_device *dev,
struct comedi_subdevice *s, struct comedi_cmd *cmd)
{
int err = 0;
unsigned int tmp;
/* step 1: make sure trigger sources are trivially valid */
tmp = cmd->start_src;
cmd->start_src &= (TRIG_NOW | TRIG_INT);
if (!cmd->start_src || tmp != cmd->start_src)
err++;
tmp = cmd->scan_begin_src;
cmd->scan_begin_src &= TRIG_EXT;
if (!cmd->scan_begin_src || tmp != cmd->scan_begin_src)
err++;
tmp = cmd->convert_src;
cmd->convert_src &= TRIG_NOW;
if (!cmd->convert_src || tmp != cmd->convert_src)
err++;
tmp = cmd->scan_end_src;
cmd->scan_end_src &= TRIG_COUNT;
if (!cmd->scan_end_src || tmp != cmd->scan_end_src)
err++;
tmp = cmd->stop_src;
cmd->stop_src &= (TRIG_COUNT | TRIG_NONE);
if (!cmd->stop_src || tmp != cmd->stop_src)
err++;
if (err)
return 1;
/* step 2: make sure trigger sources are unique and
* mutually compatible */
/* these tests are true if more than one _src bit is set */
if ((cmd->start_src & (cmd->start_src - 1)) != 0)
err++;
if ((cmd->scan_begin_src & (cmd->scan_begin_src - 1)) != 0)
err++;
if ((cmd->convert_src & (cmd->convert_src - 1)) != 0)
err++;
if ((cmd->scan_end_src & (cmd->scan_end_src - 1)) != 0)
err++;
if ((cmd->stop_src & (cmd->stop_src - 1)) != 0)
err++;
if (err)
return 2;
/* step 3: make sure arguments are trivially compatible */
/* cmd->start_src == TRIG_NOW || cmd->start_src == TRIG_INT */
if (cmd->start_arg != 0) {
cmd->start_arg = 0;
err++;
}
/* cmd->scan_begin_src == TRIG_EXT */
if (cmd->scan_begin_arg != 0) {
cmd->scan_begin_arg = 0;
err++;
}
/* cmd->convert_src == TRIG_NOW */
if (cmd->convert_arg != 0) {
cmd->convert_arg = 0;
err++;
}
/* cmd->scan_end_src == TRIG_COUNT */
if (cmd->scan_end_arg != cmd->chanlist_len) {
cmd->scan_end_arg = cmd->chanlist_len;
err++;
}
switch (cmd->stop_src) {
case TRIG_COUNT:
/* any count allowed */
break;
case TRIG_NONE:
if (cmd->stop_arg != 0) {
cmd->stop_arg = 0;
err++;
}
break;
default:
break;
}
if (err)
return 3;
/* step 4: fix up any arguments */
/* if (err) return 4; */
return 0;
}
EXPORT_SYMBOL(comedi_pcm_cmdtest);
MODULE_AUTHOR("Comedi http://www.comedi.org");
MODULE_DESCRIPTION("Comedi low-level driver");
MODULE_LICENSE("GPL");
|
