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#ifndef _ST_H

#define _ST_H

#ifndef _SCSI_H

#include "scsi.h"

#endif

#include <linux/devfs_fs_kernel.h>

#include <linux/completion.h>

/* The tape buffer descriptor. */

typedef struct {

        unsigned char in_use;

        unsigned char dma;      /* DMA-able buffer */

        int buffer_size;

        int buffer_blocks;

        int buffer_bytes;

        int read_pointer;

        int writing;

        int midlevel_result;

        int syscall_result;

        Scsi_Request *last_SRpnt;

        unsigned char *b_data;

        unsigned short use_sg;  /* zero or number of segments for this adapter */

        unsigned short sg_segs; /* total number of allocated segments */

        unsigned short orig_sg_segs;    /* number of segments allocated at first try */

        unsigned int *sg_lengths;

        struct scatterlist sg[1];       /* MUST BE last item */

} ST_buffer;

/* The tape mode definition */

typedef struct {

        unsigned char defined;

        unsigned char sysv;     /* SYS V semantics? */

        unsigned char do_async_writes;

        unsigned char do_buffer_writes;

        unsigned char do_read_ahead;

        unsigned char defaults_for_writes;

        unsigned char default_compression;      /* 0 = don't touch, etc */

        short default_density;  /* Forced density, -1 = no value */

        int default_blksize;    /* Forced blocksize, -1 = no value */

} ST_mode;

#define ST_NBR_MODE_BITS 2

#define ST_NBR_MODES (1 << ST_NBR_MODE_BITS)

#define ST_MODE_SHIFT (7 - ST_NBR_MODE_BITS)

#define ST_MODE_MASK ((ST_NBR_MODES - 1) << ST_MODE_SHIFT)

#define ST_MAX_TAPES (1 << ST_MODE_SHIFT)

/* The status related to each partition */

typedef struct {

        unsigned char rw;

        unsigned char eof;

        unsigned char at_sm;

        unsigned char last_block_valid;

        u32 last_block_visited;

        int drv_block;          /* The block where the drive head is */

        int drv_file;

} ST_partstat;

#define ST_NBR_PARTITIONS 4

/* The tape drive descriptor */

typedef struct {

        kdev_t devt;

        Scsi_Device *device;

        struct semaphore lock;  /* For serialization */

        struct completion wait; /* For SCSI commands */

        ST_buffer *buffer;

        /* Drive characteristics */

        unsigned char omit_blklims;

        unsigned char do_auto_lock;

        unsigned char can_bsr;

        unsigned char can_partitions;

        unsigned char two_fm;

        unsigned char fast_mteom;

        unsigned char immediate;

        unsigned char restr_dma;

        unsigned char scsi2_logical;

        unsigned char default_drvbuffer;        /* 0xff = don't touch, value 3 bits */

        unsigned char cln_mode;                 /* 0 = none, otherwise sense byte nbr */

        unsigned char cln_sense_value;

        unsigned char cln_sense_mask;

        unsigned char use_pf;                   /* Set Page Format bit in all mode selects? */

        unsigned char c_algo;        /* compression algorithm */

        int tape_type;

        int timeout;            /* timeout for normal commands */

        int long_timeout;       /* timeout for commands known to take long time */

        /* Mode characteristics */

        ST_mode modes[ST_NBR_MODES];

        int current_mode;

        devfs_handle_t de_r[ST_NBR_MODES];  /*  Rewind entries     */

        devfs_handle_t de_n[ST_NBR_MODES];  /*  No-rewind entries  */

        /* Status variables */

        int partition;

        int new_partition;

        int nbr_partitions;     /* zero until partition support enabled */

        ST_partstat ps[ST_NBR_PARTITIONS];

        unsigned char dirty;

        unsigned char ready;

        unsigned char write_prot;

        unsigned char drv_write_prot;

        unsigned char in_use;

        unsigned char blksize_changed;

        unsigned char density_changed;

        unsigned char compression_changed;

        unsigned char drv_buffer;

        unsigned char density;

        unsigned char door_locked;

        unsigned char autorew_dev;   /* auto-rewind device */

        unsigned char rew_at_close;  /* rewind necessary at close */

        unsigned char inited;

        unsigned char cleaning_req;  /* cleaning requested? */

        int block_size;

        int min_block;

        int max_block;

        int recover_count;     /* From tape opening */

        int recover_reg;       /* From last status call */

#if DEBUG

        unsigned char write_pending;

        int nbr_finished;

        int nbr_waits;

        unsigned char last_cmnd[6];

        unsigned char last_sense[16];

#endif

} Scsi_Tape;

/* Bit masks for use_pf */

#define USE_PF      1

#define PF_TESTED   2

/* Values of eof */

#define ST_NOEOF        0

#define ST_FM_HIT       1

#define ST_FM           2

#define ST_EOM_OK       3

#define ST_EOM_ERROR    4

#define ST_EOD_1        5

#define ST_EOD_2        6

#define ST_EOD          7

/* EOD hit while reading => ST_EOD_1 => return zero => ST_EOD_2 =>

   return zero => ST_EOD, return ENOSPC */

/* Values of rw */

#define ST_IDLE         0

#define ST_READING      1

#define ST_WRITING      2

/* Values of ready state */

#define ST_READY        0

#define ST_NOT_READY    1

#define ST_NO_TAPE      2

/* Values for door lock state */

#define ST_UNLOCKED     0

#define ST_LOCKED_EXPLICIT 1

#define ST_LOCKED_AUTO  2

#define ST_LOCK_FAILS   3

/* Positioning SCSI-commands for Tandberg, etc. drives */

#define QFA_REQUEST_BLOCK       0x02

#define QFA_SEEK_BLOCK          0x0c

/* Setting the binary options */

#define ST_DONT_TOUCH  0

#define ST_NO          1

#define ST_YES         2

#define EXTENDED_SENSE_START  18

#endif