1 /* 2 * SCSI changer interface description 3 * 4 * Written by Stefan Grefen (grefen@goofy.zdv.uni-mainz.de soon grefen@convex.com) 5 * based on the SCSI System by written Julian Elischer (julian@tfs.com) 6 * for TRW Financial Systems. 7 * 8 * TRW Financial Systems, in accordance with their agreement with Carnegie 9 * Mellon University, makes this software available to CMU to distribute 10 * or use in any manner that they see fit as long as this message is kept with 11 * the software. For this reason TFS also grants any other persons or 12 * organisations permission to use or modify this software. 13 * 14 * TFS supplies this software to be publicly redistributed 15 * on the understanding that TFS is not responsible for the correct 16 * functioning of this software in any circumstances. 17 * 18 * $Id: scsi_changer.h,v 1.2 1993/05/20 03:46:30 cgd Exp $ 19 */ 20 21 /* 22 * Ported to run under 386BSD by Julian Elischer (julian@tfs.com) Sept 1992 23 */ 24 25 /* 26 * SCSI command format 27 */ 28 struct scsi_read_element_status 29 { 30 u_char op_code; 31 u_char element_type_code:4; 32 u_char voltag:1; 33 u_char lun:3; 34 u_char starting_element_addr[2]; 35 u_char number_of_elements[2]; 36 u_char resv1; 37 u_char allocation_length[3]; 38 u_char resv2; 39 u_char link:1; 40 u_char flag:1; 41 u_char :6; 42 }; 43 #define RE_ALL_ELEMENTS 0 44 #define RE_MEDIUM_TRANSPORT_ELEMENT 1 45 #define RE_STORAGE_ELEMENT 2 46 #define RE_IMPORT_EXPORT 3 47 #define RE_DATA_TRANSFER_ELEMENT 4 48 49 struct scsi_move_medium 50 { 51 u_char op_code; 52 u_char :5; 53 u_char lun:3; 54 u_char transport_element_address[2]; 55 u_char source_address[2]; 56 u_char destination_address[2]; 57 u_char rsvd[2]; 58 u_char invert:1; 59 u_char :7; 60 u_char link:1; 61 u_char flag:1; 62 u_char :6; 63 }; 64 65 struct scsi_position_to_element 66 { 67 u_char op_code; 68 u_char :5; 69 u_char lun:3; 70 u_char transport_element_address[2]; 71 u_char source_address[2]; 72 u_char rsvd[2]; 73 u_char invert:1; 74 u_char :7; 75 u_char link:1; 76 u_char flag:1; 77 u_char :6; 78 }; 79 80 /* 81 * Opcodes 82 */ 83 #define POSITION_TO_ELEMENT 0x2b 84 #define MOVE_MEDIUM 0xa5 85 #define READ_ELEMENT_STATUS 0xb8 86 87 struct scsi_element_status_data 88 { 89 u_char first_element_reported[2]; 90 u_char number_of_elements_reported[2]; 91 u_char rsvd; 92 u_char byte_count_of_report[3]; 93 }; 94 95 struct element_status_page 96 { 97 u_char element_type_code; 98 u_char :5; 99 u_char avoltag:1; 100 u_char pvoltag:1; 101 u_char element_descriptor_length[2]; 102 u_char rsvd; 103 u_char byte_count_of_descriptor_data[3]; 104 }; 105 106