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/*

   History:

    Started: Aug 9 by Lawrence Foard (entropy@world.std.com), to allow user

     process control of SCSI devices.

    Development Sponsored by Killy Corp. NY NY

*/

#ifndef _SCSI_GENERIC_H

#define _SCSI_GENERIC_H

/*

 An SG device is accessed by writing "packets" to it, the replies

 are then read using the read call. The same header is used for

 reply, just ignore reply_len field.

*/

struct sg_header

 {

  int pack_len;    /* length of incoming packet <4096 (including header) */

  int reply_len;   /* maximum length <4096 of expected reply */

  int pack_id;     /* id number of packet */

  int result;      /* 0==ok, otherwise refer to errno codes */

  unsigned int twelve_byte:1; /* Force 12 byte command length for group 6 & 7 commands  */

  unsigned int other_flags:31;                  /* for future use */

  unsigned char sense_buffer[16]; /* used only by reads */

  /* command follows then data for command */

 };

/* ioctl's */

#define SG_SET_TIMEOUT 0x2201  /* set timeout *(int *)arg==timeout */

#define SG_GET_TIMEOUT 0x2202  /* get timeout return timeout */

#define SG_DEFAULT_TIMEOUT (60*HZ) /* 1 minute timeout */

#define SG_DEFAULT_RETRIES 1

#define SG_MAX_QUEUE 4 /* maximum outstanding request, arbitrary, may be

                          changed if sufficient DMA buffer room available */

#define SG_BIG_BUFF 32768

#endif