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#ifndef _ST_H
#define _ST_H
/*
$Header: /usr/src/linux/kernel/blk_drv/scsi/RCS/st.h,v 1.1 1992/04/24 18:01:50 root Exp root $
*/
#ifndef _SCSI_H
#include "scsi.h"
#endif
#include <linux/devfs_fs_kernel.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 */
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 sem;
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 restr_dma;
unsigned char scsi2_logical;
unsigned char default_drvbuffer; /* 0xff = don't touch, value 3 bits */
int tape_type;
int write_threshold;
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;
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;
/* 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
#endif
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