FreeBSD/Linux Kernel Cross Reference
sys/sys/chio.h

     /*
      * Copyright (c) 1996 Jason R. Thorpe <thorpej@and.com>
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
      *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgements:
     *      This product includes software developed by Jason R. Thorpe
     *      for And Communications, http://www.and.com/
     * 4. The name of the author may not be used to endorse or promote products
     *    derived from this software without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
     * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
     * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
     * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     * $FreeBSD: src/sys/sys/chio.h,v 1.7.2.3 1999/09/05 08:22:02 peter Exp $
     */
    
    #ifndef _SYS_CHIO_H_
    #define _SYS_CHIO_H_
    
    #ifndef KERNEL
    #include <sys/types.h>
    #endif
    #include <sys/ioccom.h>
    
    /*
     * Element types.  Used as "to" and "from" type indicators in move
     * and exchange operations.
     *
     * Note that code in sys/scsi/ch.c relies on these values (uses them
     * as offsets in an array, and other evil), so don't muck with them
     * unless you know what you're doing.
     */
    #define CHET_MT         0       /* medium transport (picker) */
    #define CHET_ST         1       /* storage transport (slot) */
    #define CHET_IE         2       /* import/export (portal) */
    #define CHET_DT         3       /* data transfer (drive) */
    
    /*
     * Structure used to execute a MOVE MEDIUM command.
     */
    struct changer_move {
            int     cm_fromtype;    /* element type to move from */
            int     cm_fromunit;    /* logical unit of from element */
            int     cm_totype;      /* element type to move to */
            int     cm_tounit;      /* logical unit of to element */
            int     cm_flags;       /* misc. flags */
    };
    
    /* cm_flags */
    #define CM_INVERT       0x01    /* invert media */
    
    /*
     * Structure used to execute an EXCHANGE MEDIUM command.  In an
     * exchange operation, the following steps occur:
     *
     *      - media from source is moved to first destination.
     *
     *      - media previously occupying first destination is moved
     *        to the second destination.
     *
     * The second destination may or may not be the same as the source.
     * In the case of a simple exchange, the source and second destination
     * are the same.
     */
    struct changer_exchange {
            int     ce_srctype;     /* element type of source */
            int     ce_srcunit;     /* logical unit of source */
            int     ce_fdsttype;    /* element type of first destination */
            int     ce_fdstunit;    /* logical unit of first destination */
            int     ce_sdsttype;    /* element type of second destination */
            int     ce_sdstunit;    /* logical unit of second destination */
            int     ce_flags;       /* misc. flags */
    };
    
    /* ce_flags */
    #define CE_INVERT1      0x01    /* invert media 1 */
    #define CE_INVERT2      0x02    /* invert media 2 */
    
    /*
     * Structure used to execute a POSITION TO ELEMENT command.  This
     * moves the current picker in front of the specified element.
    */
   struct changer_position {
           int     cp_type;        /* element type */
           int     cp_unit;        /* logical unit of element */
           int     cp_flags;       /* misc. flags */
   };
   
   /* cp_flags */
   #define CP_INVERT       0x01    /* invert picker */
   
   /*
    * Data returned by CHIOGPARAMS.
    */
   struct changer_params {
           int     cp_curpicker;   /* current picker */
           int     cp_npickers;    /* number of pickers */
           int     cp_nslots;      /* number of slots */
           int     cp_nportals;    /* number of import/export portals */
           int     cp_ndrives;     /* number of drives */
   };
   
   /*
    * Command used to get element status.
    */
   struct changer_element_status {
           int     ces_type;       /* element type */
           u_int8_t *ces_data;     /* pre-allocated data storage */
   };
   
   /*
    * Data returned by CHIOGSTATUS is an array of flags bytes.
    * Not all flags have meaning for all element types.
    */
   #define CESTATUS_FULL           0x01    /* element is full */
   #define CESTATUS_IMPEXP         0x02    /* media deposited by operator */
   #define CESTATUS_EXCEPT         0x04    /* element in abnormal state */
   #define CESTATUS_ACCESS         0x08    /* media accessible by picker */
   #define CESTATUS_EXENAB         0x10    /* element supports exporting */
   #define CESTATUS_INENAB         0x20    /* element supports importing */
   
   #define CESTATUS_PICKER_MASK    0x05    /* flags valid for pickers */
   #define CESTATUS_SLOT_MASK      0x0c    /* flags valid for slots */
   #define CESTATUS_PORTAL_MASK    0x3f    /* flags valid for portals */
   #define CESTATUS_DRIVE_MASK     0x0c    /* flags valid for drives */
   
   #define CESTATUS_BITS   \
           "\2\6INEAB\5EXENAB\4ACCESS\3EXCEPT\2IMPEXP\1FULL"
   
   #define CHIOMOVE        _IOW('c', 0x01, struct changer_move)
   #define CHIOEXCHANGE    _IOW('c', 0x02, struct changer_exchange)
   #define CHIOPOSITION    _IOW('c', 0x03, struct changer_position)
   #define CHIOGPICKER     _IOR('c', 0x04, int)
   #define CHIOSPICKER     _IOW('c', 0x05, int)
   #define CHIOGPARAMS     _IOR('c', 0x06, struct changer_params)
   #define CHIOGSTATUS     _IOW('c', 0x08, struct changer_element_status)
   
   #endif /* !_SYS_CHIO_H_ */

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