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 */ 11 enum { 12 gpib_command_mask = 0x7f, 13 }; 14 15 /* Possible GPIB command messages */ 16 17 enum 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. */ 39 static inline unsigned int gpib_address_restrict(u32 addr) 40 { 41 addr &= 0x1f; 42 if (addr == 0x1f) 43 addr = 0; 44 return addr; 45 } 46 47 static inline u8 MLA(u32 addr) 48 { 49 return gpib_address_restrict(addr) | LAD; 50 } 51 52 static inline u8 MTA(u32 addr) 53 { 54 return gpib_address_restrict(addr) | TAD; 55 } 56 57 static inline u8 MSA(u32 addr) 58 { 59 return (addr & 0x1f) | SAD; 60 } 61 62 static 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 74 static inline s32 is_PPE(u8 command) 75 { 76 return (command & 0x70) == 0x60; 77 } 78 79 static inline s32 is_PPD(u8 command) 80 { 81 return (command & 0x70) == 0x70; 82 } 83 84 static inline s32 in_addressed_command_group(u8 command) 85 { 86 return (command & 0x70) == 0x0; 87 } 88 89 static inline s32 in_universal_command_group(u8 command) 90 { 91 return (command & 0x70) == 0x10; 92 } 93 94 static inline s32 in_listen_address_group(u8 command) 95 { 96 return (command & 0x60) == 0x20; 97 } 98 99 static inline s32 in_talk_address_group(u8 command) 100 { 101 return (command & 0x60) == 0x40; 102 } 103 104 static 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 */ 113