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/**
Copyright(c) Conner Peripherals, Inc. 1993
Name: tfstuff.c
Description: This file contains functions formerly in tfgetnxt.c,
tfgtcfmt.c and tfgtcdev.c.
$Log: T:\logfiles\tfstuff.c_v $
Rev 1.3 17 Dec 1993 16:40:08 GREGG
Extended error reporting.
Rev 1.2 30 Aug 1993 18:47:42 GREGG
Modified the way we control hardware compression from software to work around
a bug in Archive DAT DC firmware rev. 3.58 (we shipped a lot of them).
Files Modified: lw_data.c, lw_data.h, tfstuff.c, mtf10wdb.c, mtf10wt.c and
drives.c
Rev 1.1 23 Jun 1993 11:11:32 GREGG
Added cases I removed thinking they weren't needed in TF_GetNextTapeRequest.
Rev 1.0 22 Jun 1993 18:26:18 GREGG
Combined tfgtcdev.c, tfgtcfmt.c and tfgetnxt.c, and added
TF_SetHWCompression.
**/
#include <memory.h>
#include "stdtypes.h"
#include "queues.h"
#include "drive.h"
#include "channel.h"
#include "lw_data.h"
#include "tfl_err.h"
#include "lwdefs.h"
#include "tflopen.h"
#include "lwprotos.h"
#include "tflproto.h"
#include "translat.h"
#include "retbuf.h"
#include "special.h"
#include "dilhwd.h"
#include "drvinf.h"
#include "generr.h"
#include "genfuncs.h"
#include "dil.h"
#include "be_debug.h"
#include "dddefs.h"
/**/
/**
Name: TF_GetCurrentDevice
Description: Gets the current device for the specified channel.
Returns: A THW ptr to the current hardware device.
Notes:
**/
THW_PTR TF_GetCurrentDevice( UINT16 channel_no )
{
CHANNEL_PTR channel = &lw_channels[channel_no] ;
return( &channel->cur_drv->thw_inf ) ;
}
/**/
/**
Name: TF_GetTapeFormat
Description: Gets the current tape format desciptor for the specified.
Returns: An TFINF_PTR for the current format.
Notes:
**/
TFINF_PTR TF_GetTapeFormat( UINT16 channel_no )
{
CHANNEL_PTR channel = &lw_channels[channel_no] ;
return (channel->cur_fmt != UNKNOWN_FORMAT) ? ( &lw_fmtdescr[channel->cur_fmt] ) : NULL ;
}
/**/
/**
Name: TF_TapeFormatInfo
Description: Returns a pointer to the array of format descriptions.
Returns: A pointer to the first element, and the number of formats.
Notes:
**/
TFINF_PTR TF_GetTapeFormatInfo( UINT16_PTR num_formats )
{
if ( num_formats != NULL ) {
*num_formats = lw_num_supported_fmts ;
}
return( &lw_fmtdescr[0] ) ;
}
/**/
/**
Name: TF_GetTapeFormatID
Description: Gets the current tape format ID for the specified channel.
Returns: TFGT_UNKNOWN_FORMAT if we don't know, else an ID.
Notes:
**/
UINT16 TF_GetTapeFormatID( UINT16 channel_no )
{
CHANNEL_PTR channel = &lw_channels[channel_no] ;
return (channel->cur_fmt != UNKNOWN_FORMAT)
? ( lw_fmtdescr[channel->cur_fmt].format_id )
: TFGT_UNKNOWN_FORMAT ;
}
/**/
/**
Name: TF_GetTapeFormatFromID
Description: Gets the current tape format desciptor for the specified.
Returns: A TFINF_PTR for the specified format, or NULL.
Notes:
**/
TFINF_PTR TF_GetTapeFormatFromID( UINT16 format_id )
{
UINT16 format_index = FormatIndexFromID( format_id ) ;
return ( format_index == UNKNOWN_FORMAT ) ? NULL : lw_fmtdescr + format_index ;
}
/**/
/**
Name: TF_GetNextTapeRequest
Description: Dispatches the loops IO request to the appropriate
handler.
Returns: A TFLE_xxx error code
Notes:
**/
INT16 TF_GetNextTapeRequest( RR_PTR req )
{
INT16 ret_val = TFLE_NO_ERR ;
CHANNEL_PTR channel = &lw_channels[req->channel] ;
if( FatalError( channel ) ) {
/* A fatal error has occurred. If they are calling us with any
message other than an ABORT, fail the call. */
if( req->lp_message != LRR_ABORT || req->lp_message != LRW_ABORT ) {
BE_Zprintf( DEBUG_TAPE_FORMAT, RES_TF_GETNEXT_TAPE_REQUEST ) ;
return( TFLE_NO_ERR ) ; /* can't happen... */
} else {
return( TFLE_NO_ERR ) ;
}
}
switch( channel->mode ) {
case TF_WRITE_CONTINUE:
case TF_WRITE_OPERATION:
ret_val = DoWrite( channel, req ) ;
break ;
case TF_READ_CONTINUE:
case TF_READ_OPERATION:
case TF_SCAN_CONTINUE:
case TF_SCAN_OPERATION:
/* Set up the correct filter */
channel->loop_filter = req->filter_to_use ;
ret_val = DoRead( channel, req ) ;
break ;
default:
msassert( FALSE ) ;
break ;
}
if( ret_val ) {
BE_Zprintf( DEBUG_TAPE_FORMAT, RES_TF_GETNEXT_ERROR, ret_val ) ;
if ( ret_val != TFLE_USER_ABORT && ret_val != TFLE_UNEXPECTED_EOS ) {
SetChannelStatus( channel, CH_FATAL_ERR ) ;
}
}
return( ret_val ) ;
}
/**/
/**
Name: TF_SetHWCompression
Description: This function used to make a TpSpecial Call to enable/
disable hardware compression. Due to a firmware bug in
early Archive DAT DC drives, we have to keep the drive
in uncompressed mode until we actually start a compressed
backup, and set it back to uncompressed mode as soon as
we're done. So we just set a tape format layer wide
global to indicate if the set is to be compressed. This
is yet another violation of the multiple channel concept,
and will have to be addressed in a different manner if
we ever decide to allow multiple channels.
Returns: A TFLE_xxx error code
Notes:
**/
INT16 TF_SetHWCompression( THW_PTR thw, BOOLEAN enable )
{
(void)thw ;
lw_hw_comp = enable ;
return( TFLE_NO_ERR ) ;
}
/**/
/**
Name: TF_GetLastDriveError
Description: This function calls the dil layer to get the function
id, gen_error and contents of the misc field of the
last function to report an error.
Returns: FALSE if there hasn't been an error since the last
time the function was called, or from the app start.
TRUE otherwise.
Notes:
**/
BOOLEAN TF_GetLastDriveError(
THW_PTR thw,
INT16_PTR gen_func,
INT16_PTR gen_err,
INT32_PTR gen_misc )
{
RET_BUF myret ;
if( TpSpecial( ((DRIVE_PTR)thw)->drv_hdl, SS_GET_LAST_ERROR,
(UINT32)&myret ) == SUCCESS ) {
*gen_func = myret.call_type ;
*gen_err = myret.gen_error ;
*gen_misc = myret.misc ;
return( TRUE ) ;
}
return( FALSE ) ;
}
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