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
|
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _GPIB_CMD_H
#define _GPIB_CMD_H
#include <linux/types.h>
/* Command byte definitions tests and functions */
/* mask of bits that actually matter in a command byte */
enum {
gpib_command_mask = 0x7f,
};
/* Possible GPIB command messages */
enum cmd_byte {
GTL = 0x1, /* go to local */
SDC = 0x4, /* selected device clear */
PP_CONFIG = 0x5,
GET = 0x8, /* group execute trigger */
TCT = 0x9, /* take control */
LLO = 0x11, /* local lockout */
DCL = 0x14, /* device clear */
PPU = 0x15, /* parallel poll unconfigure */
SPE = 0x18, /* serial poll enable */
SPD = 0x19, /* serial poll disable */
CFE = 0x1f, /* configure enable */
LAD = 0x20, /* value to be 'ored' in to obtain listen address */
UNL = 0x3F, /* unlisten */
TAD = 0x40, /* value to be 'ored' in to obtain talk address */
UNT = 0x5F, /* untalk */
SAD = 0x60, /* my secondary address (base) */
PPE = 0x60, /* parallel poll enable (base) */
PPD = 0x70 /* parallel poll disable */
};
/* confine address to range 0 to 30. */
static inline unsigned int gpib_address_restrict(u32 addr)
{
addr &= 0x1f;
if (addr == 0x1f)
addr = 0;
return addr;
}
static inline u8 MLA(u32 addr)
{
return gpib_address_restrict(addr) | LAD;
}
static inline u8 MTA(u32 addr)
{
return gpib_address_restrict(addr) | TAD;
}
static inline u8 MSA(u32 addr)
{
return (addr & 0x1f) | SAD;
}
static inline s32 gpib_address_equal(u32 pad1, s32 sad1, u32 pad2, s32 sad2)
{
if (pad1 == pad2) {
if (sad1 == sad2)
return 1;
if (sad1 < 0 && sad2 < 0)
return 1;
}
return 0;
}
static inline s32 is_PPE(u8 command)
{
return (command & 0x70) == 0x60;
}
static inline s32 is_PPD(u8 command)
{
return (command & 0x70) == 0x70;
}
static inline s32 in_addressed_command_group(u8 command)
{
return (command & 0x70) == 0x0;
}
static inline s32 in_universal_command_group(u8 command)
{
return (command & 0x70) == 0x10;
}
static inline s32 in_listen_address_group(u8 command)
{
return (command & 0x60) == 0x20;
}
static inline s32 in_talk_address_group(u8 command)
{
return (command & 0x60) == 0x40;
}
static inline s32 in_primary_command_group(u8 command)
{
return in_addressed_command_group(command) ||
in_universal_command_group(command) ||
in_listen_address_group(command) ||
in_talk_address_group(command);
}
#endif /* _GPIB_CMD_H */
|
