android_scsi_sg.h

/*
    pkTriggerCord
    Copyright (C) 2011-2019 Andras Salamon <andras.salamon@melda.info>
    Remote control of Pentax DSLR cameras.

    based on:

    PK-Remote
    Remote control of Pentax DSLR cameras.
    Copyright (C) 2008 Pontus Lidman <pontus@lysator.liu.se>

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU Lesser General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.

    You should have received a copy of the GNU General Public License
    and GNU Lesser General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
typedef struct sg_io_hdr {
    int interface_id;           /* [i] 'S' for SCSI generic (required) */
    int dxfer_direction;        /* [i] data transfer direction  */
    unsigned char cmd_len;      /* [i] SCSI command length ( <= 16 bytes) */
    unsigned char mx_sb_len;    /* [i] max length to write to sbp */
    unsigned short int iovec_count; /* [i] 0 implies no scatter gather */
    unsigned int dxfer_len;     /* [i] byte count of data transfer */
    void * dxferp;              /* [i], [*io] points to data transfer memory
                 or scatter gather list */
    unsigned char * cmdp;       /* [i], [*i] points to command to perform */
    unsigned char * sbp;        /* [i], [*o] points to sense_buffer memory */
    unsigned int timeout;       /* [i] MAX_UINT->no timeout (unit: millisec) */
    unsigned int flags;         /* [i] 0 -> default, see SG_FLAG... */
    int pack_id;                /* [i->o] unused internally (normally) */
    void * usr_ptr;             /* [i->o] unused internally */
    unsigned char status;       /* [o] scsi status */
    unsigned char masked_status;/* [o] shifted, masked scsi status */
    unsigned char msg_status;   /* [o] messaging level data (optional) */
    unsigned char sb_len_wr;    /* [o] byte count actually written to sbp */
    unsigned short int host_status; /* [o] errors from host adapter */
    unsigned short int driver_status;/* [o] errors from software driver */
    int resid;                  /* [o] dxfer_len - actual_transferred */
    unsigned int duration;      /* [o] time taken by cmd (unit: millisec) */
    unsigned int info;          /* [o] auxiliary information */
} sg_io_hdr_t;

#define SG_DXFER_TO_DEV     -2
#define SG_DXFER_FROM_DEV   -3

/* synchronous SCSI command ioctl, (only in version 3 interface) */
#define SG_IO 0x2285   /* similar effect as write() followed by read() */

/* The following 'info' values are "or"-ed together.  */
#define SG_INFO_OK_MASK 0x1
#define SG_INFO_OK      0x0 /* no sense, host nor driver "noise" */
#define SG_INFO_CHECK   0x1     /* something abnormal happened */