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scsi_changer.h revision 1.2 
      1 /*
      2  * SCSI changer interface description
      3  *
      4  * Written by Stefan Grefen   (grefen (at) goofy.zdv.uni-mainz.de soon grefen (at) convex.com)
      5  * based on the SCSI System by written Julian Elischer (julian (at) 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 (at) 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