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1/* SPDX-License-Identifier: GPL-2.0 */
2
3#ifndef _GPIB_CMD_H
4#define _GPIB_CMD_H
5
6#include <linux/types.h>
7
8/* Command byte definitions tests and functions */
9
10/* mask of bits that actually matter in a command byte */
11enum {
12 gpib_command_mask = 0x7f,
13};
14
15/* Possible GPIB command messages */
16
17enum cmd_byte {
18 GTL = 0x1, /* go to local */
19 SDC = 0x4, /* selected device clear */
20 PP_CONFIG = 0x5,
21 GET = 0x8, /* group execute trigger */
22 TCT = 0x9, /* take control */
23 LLO = 0x11, /* local lockout */
24 DCL = 0x14, /* device clear */
25 PPU = 0x15, /* parallel poll unconfigure */
26 SPE = 0x18, /* serial poll enable */
27 SPD = 0x19, /* serial poll disable */
28 CFE = 0x1f, /* configure enable */
29 LAD = 0x20, /* value to be 'ored' in to obtain listen address */
30 UNL = 0x3F, /* unlisten */
31 TAD = 0x40, /* value to be 'ored' in to obtain talk address */
32 UNT = 0x5F, /* untalk */
33 SAD = 0x60, /* my secondary address (base) */
34 PPE = 0x60, /* parallel poll enable (base) */
35 PPD = 0x70 /* parallel poll disable */
36};
37
38/* confine address to range 0 to 30. */
39static inline unsigned int gpib_address_restrict(u32 addr)
40{
41 addr &= 0x1f;
42 if (addr == 0x1f)
43 addr = 0;
44 return addr;
45}
46
47static inline u8 MLA(u32 addr)
48{
49 return gpib_address_restrict(addr) | LAD;
50}
51
52static inline u8 MTA(u32 addr)
53{
54 return gpib_address_restrict(addr) | TAD;
55}
56
57static inline u8 MSA(u32 addr)
58{
59 return (addr & 0x1f) | SAD;
60}
61
62static inline s32 gpib_address_equal(u32 pad1, s32 sad1, u32 pad2, s32 sad2)
63{
64 if (pad1 == pad2) {
65 if (sad1 == sad2)
66 return 1;
67 if (sad1 < 0 && sad2 < 0)
68 return 1;
69 }
70
71 return 0;
72}
73
74static inline s32 is_PPE(u8 command)
75{
76 return (command & 0x70) == 0x60;
77}
78
79static inline s32 is_PPD(u8 command)
80{
81 return (command & 0x70) == 0x70;
82}
83
84static inline s32 in_addressed_command_group(u8 command)
85{
86 return (command & 0x70) == 0x0;
87}
88
89static inline s32 in_universal_command_group(u8 command)
90{
91 return (command & 0x70) == 0x10;
92}
93
94static inline s32 in_listen_address_group(u8 command)
95{
96 return (command & 0x60) == 0x20;
97}
98
99static inline s32 in_talk_address_group(u8 command)
100{
101 return (command & 0x60) == 0x40;
102}
103
104static inline s32 in_primary_command_group(u8 command)
105{
106 return in_addressed_command_group(command) ||
107 in_universal_command_group(command) ||
108 in_listen_address_group(command) ||
109 in_talk_address_group(command);
110}
111
112#endif /* _GPIB_CMD_H */