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plustek.c

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/*.............................................................................
 * Project : SANE library for Plustek flatbed scanners.
 *.............................................................................
 */
 
/** @file plustek.c
 *  @brief SANE backend for Plustek scanner
 *
 * Based on Kazuhiro Sasayama previous work on
 * plustek.[ch] file from the SANE package.<br>
 * Original code taken from sane-0.71<br>
 * Copyright (C) 1997 Hypercore Software Design, Ltd.<br>
 * Also based on the work done by Rick Bronson<br>
 * Copyright (C) 2000-2004 Gerhard Jaeger <gerhard@gjaeger.de><br>
 *
 * History:
 * - 0.30 - initial version
 * - 0.31 - no changes
 * - 0.32 - no changes
 * - 0.33 - no changes
 * - 0.34 - moved some definitions and typedefs to plustek.h
 * - 0.35 - removed Y-correction for 12000P model<br>
 *        - getting Y-size of scan area from driver
 * - 0.36 - disabled Dropout, as this does currently not work<br>
 *        - enabled Halftone selection only for Halftone-mode<br>
 *        - made the cancel button work by using a child process during read<br>
 *        - added version code to driver interface<br>
 *        - cleaned up the code<br>
 *        - fixed sane compatibility problems<br>
 *        - added multiple device support<br>
 *        - 12bit color-depth are now available for scanimage
 * - 0.37 - removed X/Y autocorrection, now correcting the stuff
 *          before scanning
 *        - applied Michaels' patch to solve the sane_get_parameter problem<br>
 *        - getting X-size of scan area from driver<br>
 *        - applied Michaels patch for OPT_RESOLUTION (SANE_INFO_INEXACT stuff)
 * - 0.38 - now using the information from the driver
 *        - some minor fixes<br>
 *        - removed dropout stuff<br>
 *        - removed some warning conditions
 * - 0.39 - added stuff to use the backend completely in user mode<br>
 *        - fixed a potential buffer problem<br>
 *        - removed function attach_one()<br>
 *        - added USB interface stuff
 * - 0.40 - USB scanning works now
 * - 0.41 - added some configuration stuff and also changed .conf file<br>
 *        - added call to sanei_usb_init() and sanei_lm983x_init()
 * - 0.42 - added adjustment stuff<br>
 *        - added custom gamma tables<br>
 *        - fixed a problem with the "size-sliders"<br>
 *        - fixed a bug that causes segfault when using the autodetection for
 *          USB devices<br>
 *        - added OS/2 switch to disable the USB stuff for OS/2
 * - 0.43 - added support for PREVIEW flag
 * - 0.44 - added _DBG_DUMP debug level<br>
 *        - fixed a bug, that stops our lamp timer
 * - 0.45 - added additional flags
 *        - added WIFSIGNALED to check result of child termination
 *        - changed readImage interface for USB devices
 *        - homeing of USB scanner is now working correctly
 * - 0.46 - added plustek-usbcal.c for extra CIS device calibration
 *          based on Montys' great work
 *        - added altCalibration option
 *        - removed parallelport support --> new backend: plustek_pp
 *        - cleanup
 *        - added sanei_thread support
 * - 0.47 - added mov-option (model override)
 *        - removed drvOpen
 *        - added call to usb_StartLampTimer, when we're using
 *          SIGALRM for lamp timer
 *        - closing now writer pipe, when reader_process is done
 * - 0.48 - added additional options
 *          split scanmode and bit-depth
 *.
 * <hr>
 * This file is part of the SANE package.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 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
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
 * MA 02111-1307, USA.
 *
 * As a special exception, the authors of SANE give permission for
 * additional uses of the libraries contained in this release of SANE.
 *
 * The exception is that, if you link a SANE library with other files
 * to produce an executable, this does not by itself cause the
 * resulting executable to be covered by the GNU General Public
 * License.  Your use of that executable is in no way restricted on
 * account of linking the SANE library code into it.
 *
 * This exception does not, however, invalidate any other reasons why
 * the executable file might be covered by the GNU General Public
 * License.
 *
 * If you submit changes to SANE to the maintainers to be included in
 * a subsequent release, you agree by submitting the changes that
 * those changes may be distributed with this exception intact.
 *
 * If you write modifications of your own for SANE, it is your choice
 * whether to permit this exception to apply to your modifications.
 * If you do not wish that, delete this exception notice.
 * <hr>
 */

/** @mainpage
 *  @verbinclude Plustek-USB.txt
 */
  
#ifdef _AIX
# include "../include/lalloca.h" 
#endif

#include "../include/sane/config.h"
#include "../include/lalloca.h"

#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <signal.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <unistd.h>
#include <time.h>
#include <math.h>

#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif

#include <sys/types.h>
#include <sys/ioctl.h>

#include "../include/sane/sane.h"
#include "../include/sane/sanei.h"
#include "../include/sane/saneopts.h"

#define BACKEND_VERSION "0.48-10"
#define BACKEND_NAME    plustek
#include "../include/sane/sanei_backend.h"
#include "../include/sane/sanei_config.h"
#include "../include/sane/sanei_thread.h"

#include "plustek-usb.h"
#include "plustek.h"

/*********************** the debug levels ************************************/

#define _DBG_FATAL      0
#define _DBG_ERROR      1
#define _DBG_WARNING    3
#define _DBG_INFO       5
#define _DBG_PROC       7
#define _DBG_SANE_INIT 10
#define _DBG_INFO2     15
#define _DBG_DREGS     20        
#define _DBG_DPIC      25        
#define _DBG_READ      30

/*****************************************************************************/

#define _SECTION        "[usb]"
#define _DEFAULT_DEVICE "auto"

/** to disable the backend... */
00177 #define _PLUSTEK_USB

/* declare it here, as it's used in plustek-usbscan.c too :-( */
static SANE_Bool cancelRead;

/* the USB-stuff... I know this is in general no good idea, but it works */
#ifdef _PLUSTEK_USB
# include "plustek-usbio.c"
# include "plustek-usbdevs.c"
# include "plustek-usbhw.c"
# include "plustek-usbmap.c"
# include "plustek-usbscan.c"
# include "plustek-usbimg.c"
# include "plustek-usbcalfile.c"
# include "plustek-usbshading.c"
# include "plustek-usbcal.c"
# include "plustek-usb.c"
#endif

/************************** global vars **************************************/

static int                 num_devices;
static Plustek_Device     *first_dev;
static Plustek_Scanner    *first_handle;
static const SANE_Device **devlist = 0;
static unsigned long       tsecs   = 0;

static const SANE_Int bpp_lm9832_list [] = { 2, 8, 14 };
static const SANE_Int bpp_lm9833_list [] = { 2, 8, 16 };

static const SANE_String_Const mode_usb_list[] =
{
      SANE_VALUE_SCAN_MODE_LINEART,
      SANE_VALUE_SCAN_MODE_GRAY,
      SANE_VALUE_SCAN_MODE_COLOR,
      NULL
};

static const SANE_String_Const ext_mode_list[] =
{
      SANE_I18N("Normal"),
      SANE_I18N("Transparency"),
      SANE_I18N("Negative"),
      NULL
};

static const SANE_Range percentage_range =
{
      -100 << SANE_FIXED_SCALE_SHIFT, /* minimum      */
       100 << SANE_FIXED_SCALE_SHIFT, /* maximum      */
         1 << SANE_FIXED_SCALE_SHIFT  /* quantization */
};

static const SANE_Range warmup_range   = { -1,   999, 1 };
static const SANE_Range offtimer_range = {  0,   999, 1 };
static const SANE_Range gain_range     = { -1,    63, 1 };
static const SANE_Range loff_range     = { -1, 16363, 1 };

/* authorization stuff */
static SANE_Auth_Callback auth = NULL;

/****************************** the backend... *******************************/

#define _YN(x) (x?"yes":"no")

/** function to display the configuration options for the current device
 * @param cnf - pointer to the configuration structure whose content should be
 *              displayed
 */
00246 static void show_cnf( pCnfDef cnf )
{
      DBG( _DBG_SANE_INIT,"Device configuration:\n" );
      DBG( _DBG_SANE_INIT,"device name  : >%s<\n",cnf->devName                 );
      DBG( _DBG_SANE_INIT,"USB-ID       : >%s<\n",cnf->usbId                   );
      DBG( _DBG_SANE_INIT,"model ovr.   : %d\n",  cnf->adj.mov                 );
      DBG( _DBG_SANE_INIT,"warmup       : %ds\n", cnf->adj.warmup              );
      DBG( _DBG_SANE_INIT,"lampOff      : %d\n",  cnf->adj.lampOff             );
      DBG( _DBG_SANE_INIT,"lampOffOnEnd : %s\n",  _YN(cnf->adj.lampOffOnEnd   ));
      DBG( _DBG_SANE_INIT,"cacheCalData : %s\n",  _YN(cnf->adj.cacheCalData   ));
      DBG( _DBG_SANE_INIT,"altCalibrate : %s\n",  _YN(cnf->adj.altCalibrate   ));
      DBG( _DBG_SANE_INIT,"skipCalibr.  : %s\n",  _YN(cnf->adj.skipCalibration));
      DBG( _DBG_SANE_INIT,"skipFine     : %s\n",  _YN(cnf->adj.skipFine       ));
      DBG( _DBG_SANE_INIT,"skipFineWhite: %s\n",  _YN(cnf->adj.skipFineWhite  ));
      DBG( _DBG_SANE_INIT,"invertNegs.  : %s\n",  _YN(cnf->adj.invertNegatives));
      DBG( _DBG_SANE_INIT,"dis.Speedup  : %s\n",  _YN(cnf->adj.disableSpeedup ));
      DBG( _DBG_SANE_INIT,"pos_x        : %d\n",  cnf->adj.pos.x               );
      DBG( _DBG_SANE_INIT,"pos_y        : %d\n",  cnf->adj.pos.y               );
      DBG( _DBG_SANE_INIT,"pos_shading_y: %d\n",  cnf->adj.posShadingY         );
      DBG( _DBG_SANE_INIT,"neg_x        : %d\n",  cnf->adj.neg.x               );
      DBG( _DBG_SANE_INIT,"neg_y        : %d\n",  cnf->adj.neg.y               );
      DBG( _DBG_SANE_INIT,"neg_shading_y: %d\n",  cnf->adj.negShadingY         );
      DBG( _DBG_SANE_INIT,"tpa_x        : %d\n",  cnf->adj.tpa.x               );
      DBG( _DBG_SANE_INIT,"tpa_y        : %d\n",  cnf->adj.tpa.y               );
      DBG( _DBG_SANE_INIT,"tpa_shading_y: %d\n",  cnf->adj.tpaShadingY         );
      DBG( _DBG_SANE_INIT,"red gain     : %d\n",  cnf->adj.rgain               );
      DBG( _DBG_SANE_INIT,"green gain   : %d\n",  cnf->adj.ggain               );
      DBG( _DBG_SANE_INIT,"blue gain    : %d\n",  cnf->adj.bgain               );
      DBG( _DBG_SANE_INIT,"red offset   : %d\n",  cnf->adj.rofs                );
      DBG( _DBG_SANE_INIT,"green offset : %d\n",  cnf->adj.gofs                );
      DBG( _DBG_SANE_INIT,"blue offset  : %d\n",  cnf->adj.bofs                );
      DBG( _DBG_SANE_INIT,"red lampoff  : %d\n",  cnf->adj.rlampoff            );
      DBG( _DBG_SANE_INIT,"green lampoff: %d\n",  cnf->adj.glampoff            );
      DBG( _DBG_SANE_INIT,"blue lampoff : %d\n",  cnf->adj.blampoff            );
      DBG( _DBG_SANE_INIT,"red Gamma    : %.2f\n",cnf->adj.rgamma              );
      DBG( _DBG_SANE_INIT,"green Gamma  : %.2f\n",cnf->adj.ggamma              );
      DBG( _DBG_SANE_INIT,"blue Gamma   : %.2f\n",cnf->adj.bgamma              );
      DBG( _DBG_SANE_INIT,"gray Gamma   : %.2f\n",cnf->adj.graygamma           );
      DBG( _DBG_SANE_INIT,"---------------------\n" );
}

/** Calls the device specific stop and close functions.
 * @param  dev - pointer to the device specific structure
 * @return The function always returns SANE_STATUS_GOOD
 */
static SANE_Status 
00292 drvclose( Plustek_Device *dev )
{
      if( dev->fd >= 0 ) {

            DBG( _DBG_INFO, "drvclose()\n" );

            if( 0 != tsecs ) {
                  DBG( _DBG_INFO, "TIME END 1: %lus\n", time(NULL)-tsecs);
            }

            /* don't check the return values, simply do it */
            usbDev_stopScan( dev );
            usbDev_close   ( dev );
      }
      dev->fd = -1;

      return SANE_STATUS_GOOD;
}

/** according to the mode and source we return the corresponding scanmode and
 *  bit-depth per pixel
 */
static int
00315 getScanMode( Plustek_Scanner *scanner )
{
      int mode;
      int scanmode;
      
      /* are we in TPA-mode? */
      mode = scanner->val[OPT_MODE].w;
      if( scanner->val[OPT_EXT_MODE].w != 0 )
            mode += 2; 
      
      scanner->params.depth = scanner->val[OPT_BIT_DEPTH].w;
      
      if( mode == 0 ) {
            scanmode = COLOR_BW;
            scanner->params.depth = 1;
      } else if( scanner->params.depth == 8 ) {

            if( mode == 1 )
                  scanmode = COLOR_256GRAY;
            else
                  scanmode = COLOR_TRUE24;
      } else {
            scanner->params.depth = 16;
            if( mode == 1 )
                  scanmode =  COLOR_GRAY16;
            else
                  scanmode = COLOR_TRUE48;
      } 
      return scanmode;
}

/** shutdown open pipes
 */
static SANE_Status 
00349 close_pipe( Plustek_Scanner *scanner )
{
      if( scanner->r_pipe >= 0 ) {

            DBG( _DBG_PROC, "close_pipe (r_pipe)\n" );
            close( scanner->r_pipe );
            scanner->r_pipe = -1;
      }
      if( scanner->w_pipe >= 0 ) {

            DBG( _DBG_PROC, "close_pipe (w_pipe)\n" );
            close( scanner->w_pipe );
            scanner->w_pipe = -1;
      }
      return SANE_STATUS_EOF;
}

/** will be called when a child is going down
 */
00368 static void sig_chldhandler( int signo )
{
      DBG( _DBG_PROC, "(SIG) Child is down (signal=%d)\n", signo );
}

/** signal handler to kill the child process
 */
00375 static RETSIGTYPE reader_process_sigterm_handler( int signo )
{
      DBG( _DBG_PROC, "(SIG) reader_process: terminated by signal %d\n", signo );
      _exit( SANE_STATUS_GOOD );
}

static RETSIGTYPE usb_reader_process_sigterm_handler( int signo )
{
      DBG( _DBG_PROC, "(SIG) reader_process: terminated by signal %d\n", signo );
      cancelRead = SANE_TRUE;
}

static RETSIGTYPE sigalarm_handler( int signo )
{
      _VAR_NOT_USED( signo );
      DBG( _DBG_PROC, "ALARM!!!\n" );
}

/** executed as a child process
 * read the data from the driver and send them to the parent process
 */
00396 static int reader_process( void *args )
{
      int              line, lerrn;
      unsigned char   *buf;
      unsigned long    status;
      unsigned long    data_length;
      struct SIGACTION act;
      sigset_t         ignore_set;
      Plustek_Scanner *scanner = (Plustek_Scanner *)args;

      if( sanei_thread_is_forked()) {
            DBG( _DBG_PROC, "reader_process started (forked)\n" );
            close( scanner->r_pipe );
            scanner->r_pipe = -1;
      } else {
            DBG( _DBG_PROC, "reader_process started (as thread)\n" );
      }

      sigfillset ( &ignore_set );
      sigdelset  ( &ignore_set, SIGTERM );
#if defined (__APPLE__) && defined (__MACH__)
      sigdelset  ( &ignore_set, SIGUSR2 );
#endif
      sigprocmask( SIG_SETMASK, &ignore_set, 0 );

      memset   ( &act, 0, sizeof (act));
      sigaction( SIGTERM, &act, 0 );

      cancelRead = SANE_FALSE;

      /* install the signal handler */
      sigemptyset(&(act.sa_mask));
      act.sa_flags = 0;

      act.sa_handler = reader_process_sigterm_handler;
      sigaction( SIGTERM, &act, 0 );

      act.sa_handler = usb_reader_process_sigterm_handler;
      sigaction( SIGUSR1, &act, 0 );

      data_length = scanner->params.lines * scanner->params.bytes_per_line;

      DBG( _DBG_PROC, "reader_process:"
                              "starting to READ data (%lu bytes)\n", data_length );
      DBG( _DBG_PROC, "buf = 0x%08lx\n", (unsigned long)scanner->buf );

      if( NULL == scanner->buf ) {
            DBG( _DBG_FATAL, "NULL Pointer !!!!\n" );
            return SANE_STATUS_IO_ERROR;
      }

      /* here we read all data from the driver... */
      buf    = scanner->buf;
      status = usbDev_Prepare( scanner->hw, buf );

      if( 0 == status ) {

            for( line = 0; line < scanner->params.lines; line++ ) {

                  status = usbDev_ReadLine( scanner->hw );
                  if((int)status < 0 ) {
                        break;
                  }
                  write( scanner->w_pipe, buf, scanner->params.bytes_per_line );
                  buf += scanner->params.bytes_per_line;
            }
      }

      /* on error, there's no need to clean up, as this is done by the parent */
      lerrn = errno;

      close( scanner->w_pipe );
      scanner->w_pipe = -1;

      if((int)status < 0 ) {
            DBG( _DBG_ERROR, "read failed, status = %i, errno %i\n",
                                                          (int)status, lerrn );
            if( _E_ABORT == (int)status )
                  return SANE_STATUS_CANCELLED;
            
            if( lerrn == EBUSY )
                  return SANE_STATUS_DEVICE_BUSY;

            return SANE_STATUS_IO_ERROR;
      }

      DBG( _DBG_PROC, "reader_process: finished reading data\n" );
      return SANE_STATUS_GOOD;
}

/** stop the current scan process
 */
00488 static SANE_Status do_cancel( Plustek_Scanner *scanner, SANE_Bool closepipe  )
{
      struct SIGACTION act;
      pid_t            res;

      DBG( _DBG_PROC,"do_cancel\n" );

      scanner->scanning = SANE_FALSE;

      if( scanner->reader_pid > 0 ) {

            DBG( _DBG_PROC, ">>>>>>>> killing reader_process <<<<<<<<\n" );

            cancelRead = SANE_TRUE;

            sigemptyset(&(act.sa_mask));
            act.sa_flags = 0;

            act.sa_handler = sigalarm_handler;
            sigaction( SIGALRM, &act, 0 );

            /* kill our child process and wait until done */
            sanei_thread_sendsig( scanner->reader_pid, SIGUSR1 );

            /* give'em 10 seconds 'til done...*/
            alarm(10);
            res = sanei_thread_waitpid( scanner->reader_pid, 0 );
            alarm(0);

            if( res != scanner->reader_pid ) {
                  DBG( _DBG_PROC,"sanei_thread_waitpid() failed !\n");

                  /* do it the hard way...*/
#ifdef USE_PTHREAD
                  sanei_thread_kill( scanner->reader_pid );
#else
                  sanei_thread_sendsig( scanner->reader_pid, SIGKILL );
#endif
            }
            scanner->reader_pid = 0;
            DBG( _DBG_PROC,"reader_process killed\n");
#ifndef HAVE_SETITIMER
            usb_StartLampTimer( scanner->hw );
#endif
      }

      if( SANE_TRUE == closepipe ) {
            close_pipe( scanner );
      }

      drvclose( scanner->hw );

      if( tsecs != 0 ) {
            DBG( _DBG_INFO, "TIME END 2: %lus\n", time(NULL)-tsecs);
            tsecs = 0;
      }

      return SANE_STATUS_CANCELLED;
}

/** Currently we support only LM9831/2/3 chips and these use the same
 * sizes...
 * @param  s - pointer to the scanner specific structure
 * @return The function always returns SANE_STATUS_GOOD
 */
00553 static SANE_Status initGammaSettings( Plustek_Scanner *s )
{
      int    i, j, val;
      double gamma;

      s->gamma_length      = 4096;
      s->gamma_range.min   = 0;
      s->gamma_range.max   = 255;
      s->gamma_range.quant = 0;

      DBG( _DBG_INFO, "Presetting Gamma tables (len=%u)\n", s->gamma_length );

      /* preset the gamma maps
       */
      for( i = 0; i < 4; i++ ) {

            switch( i ) {
                  case 1:  gamma = s->hw->adj.rgamma;    break;
                  case 2:  gamma = s->hw->adj.ggamma;    break;
                  case 3:  gamma = s->hw->adj.bgamma;    break;
                  default: gamma = s->hw->adj.graygamma; break;
            }
            DBG( _DBG_INFO, "* Channel[%u], gamma %.3f\n", i, gamma );

            for( j = 0; j < s->gamma_length; j++ ) {

                  val = (s->gamma_range.max *
                              pow((double) j / ((double)s->gamma_length - 1.0),
                              1.0 / gamma ));

                  if( val > s->gamma_range.max )
                        val = s->gamma_range.max;

                  s->gamma_table[i][j] = val;
            }
      }
      DBG( _DBG_INFO, "----------------------------------\n" );
      return SANE_STATUS_GOOD;
}

/** Check the gamma vectors we got back and limit if necessary
 * @param  s - pointer to the scanner specific structure
 * @return nothing
 */
00597 static void checkGammaSettings( Plustek_Scanner *s )
{
      int i, j;

      DBG( _DBG_INFO, "Maps changed...\n" );
      for( i = 0; i < 4 ; i++ ) {
            for( j = 0; j < s->gamma_length; j++ ) {
                  if( s->gamma_table[i][j] > s->gamma_range.max ) {
                        s->gamma_table[i][j] = s->gamma_range.max;
                  }
            }
      }
}

/** initialize the options for the backend according to the device we have
 */
00613 static SANE_Status init_options( Plustek_Scanner *s )
{
      int i;
      Plustek_Device *dev = s->hw;
      AdjDef         *adj = &dev->adj;

      memset( s->opt, 0, sizeof(s->opt));

      for( i = 0; i < NUM_OPTIONS; ++i ) {
            s->opt[i].size = sizeof (SANE_Word);
            s->opt[i].cap = SANE_CAP_SOFT_SELECT | SANE_CAP_SOFT_DETECT;
      }

      s->opt[OPT_NUM_OPTS].name  = SANE_NAME_NUM_OPTIONS;
      s->opt[OPT_NUM_OPTS].title = SANE_TITLE_NUM_OPTIONS;
      s->opt[OPT_NUM_OPTS].desc  = SANE_DESC_NUM_OPTIONS;
      s->opt[OPT_NUM_OPTS].type  = SANE_TYPE_INT;
      s->opt[OPT_NUM_OPTS].unit  = SANE_UNIT_NONE;
      s->opt[OPT_NUM_OPTS].cap   = SANE_CAP_SOFT_DETECT;
      s->opt[OPT_NUM_OPTS].constraint_type = SANE_CONSTRAINT_NONE;
      s->val[OPT_NUM_OPTS].w     = NUM_OPTIONS;

      /* "Scan Mode" group: */
      s->opt[OPT_MODE_GROUP].name  = "scanmode-group";
      s->opt[OPT_MODE_GROUP].title = SANE_I18N("Scan Mode");
      s->opt[OPT_MODE_GROUP].desc  = "";
      s->opt[OPT_MODE_GROUP].type  = SANE_TYPE_GROUP;
      s->opt[OPT_MODE_GROUP].cap   = 0;

      /* scan mode */
      s->opt[OPT_MODE].name  = SANE_NAME_SCAN_MODE;
      s->opt[OPT_MODE].title = SANE_TITLE_SCAN_MODE;
      s->opt[OPT_MODE].desc  = SANE_DESC_SCAN_MODE;
      s->opt[OPT_MODE].type  = SANE_TYPE_STRING;
      s->opt[OPT_MODE].size  = 32;
      s->opt[OPT_MODE].constraint_type = SANE_CONSTRAINT_STRING_LIST;
      s->opt[OPT_MODE].constraint.string_list = mode_usb_list;
      s->val[OPT_MODE].w = 2; /* Color */
  
      /* bit depth */
      s->opt[OPT_BIT_DEPTH].name  = SANE_NAME_BIT_DEPTH;
      s->opt[OPT_BIT_DEPTH].title = SANE_TITLE_BIT_DEPTH;
      s->opt[OPT_BIT_DEPTH].desc  = SANE_DESC_BIT_DEPTH;
      s->opt[OPT_BIT_DEPTH].type  = SANE_TYPE_INT;
      s->opt[OPT_BIT_DEPTH].size  = sizeof (SANE_Word);
      s->opt[OPT_BIT_DEPTH].constraint_type = SANE_CONSTRAINT_WORD_LIST;
      if( _LM9833 == dev->usbDev.HwSetting.chip )
            s->opt[OPT_BIT_DEPTH].constraint.word_list = bpp_lm9833_list;
      else
            s->opt[OPT_BIT_DEPTH].constraint.word_list = bpp_lm9832_list;
      s->val[OPT_BIT_DEPTH].w = 8;
      
      /* scan source */
      s->opt[OPT_EXT_MODE].name  = SANE_NAME_SCAN_SOURCE;
      s->opt[OPT_EXT_MODE].title = SANE_TITLE_SCAN_SOURCE;
      s->opt[OPT_EXT_MODE].desc  = SANE_DESC_SCAN_SOURCE;
      s->opt[OPT_EXT_MODE].type  = SANE_TYPE_STRING;
      s->opt[OPT_EXT_MODE].size  = 32;
      s->opt[OPT_EXT_MODE].constraint_type = SANE_CONSTRAINT_STRING_LIST;
      s->opt[OPT_EXT_MODE].constraint.string_list = ext_mode_list;
      s->val[OPT_EXT_MODE].w     = 0; /* Normal */

      /* brightness */
      s->opt[OPT_BRIGHTNESS].name  = SANE_NAME_BRIGHTNESS;
      s->opt[OPT_BRIGHTNESS].title = SANE_TITLE_BRIGHTNESS;
      s->opt[OPT_BRIGHTNESS].desc  = SANE_DESC_BRIGHTNESS;
      s->opt[OPT_BRIGHTNESS].type  = SANE_TYPE_FIXED;
      s->opt[OPT_BRIGHTNESS].unit  = SANE_UNIT_PERCENT;
      s->opt[OPT_BRIGHTNESS].constraint_type = SANE_CONSTRAINT_RANGE;
      s->opt[OPT_BRIGHTNESS].constraint.range = &percentage_range;
      s->val[OPT_BRIGHTNESS].w     = 0;

      /* contrast */
      s->opt[OPT_CONTRAST].name  = SANE_NAME_CONTRAST;
      s->opt[OPT_CONTRAST].title = SANE_TITLE_CONTRAST;
      s->opt[OPT_CONTRAST].desc  = SANE_DESC_CONTRAST;
      s->opt[OPT_CONTRAST].type  = SANE_TYPE_FIXED;
      s->opt[OPT_CONTRAST].unit  = SANE_UNIT_PERCENT;
      s->opt[OPT_CONTRAST].constraint_type = SANE_CONSTRAINT_RANGE;
      s->opt[OPT_CONTRAST].constraint.range = &percentage_range;
      s->val[OPT_CONTRAST].w     = 0;

      /* resolution */
      s->opt[OPT_RESOLUTION].name  = SANE_NAME_SCAN_RESOLUTION;
      s->opt[OPT_RESOLUTION].title = SANE_TITLE_SCAN_RESOLUTION;
      s->opt[OPT_RESOLUTION].desc  = SANE_DESC_SCAN_RESOLUTION;
      s->opt[OPT_RESOLUTION].type  = SANE_TYPE_INT;
      s->opt[OPT_RESOLUTION].unit  = SANE_UNIT_DPI;

      s->opt[OPT_RESOLUTION].constraint_type  = SANE_CONSTRAINT_RANGE;
      s->opt[OPT_RESOLUTION].constraint.range = &s->hw->dpi_range;
      s->val[OPT_RESOLUTION].w = s->hw->dpi_range.min;

      /* custom-gamma table */
      s->opt[OPT_CUSTOM_GAMMA].name  = SANE_NAME_CUSTOM_GAMMA;
      s->opt[OPT_CUSTOM_GAMMA].title = SANE_TITLE_CUSTOM_GAMMA;
      s->opt[OPT_CUSTOM_GAMMA].desc  = SANE_DESC_CUSTOM_GAMMA;
      s->opt[OPT_CUSTOM_GAMMA].type  = SANE_TYPE_BOOL;
      s->val[OPT_CUSTOM_GAMMA].w     = SANE_FALSE;

      /* preview */
      s->opt[OPT_PREVIEW].name  = SANE_NAME_PREVIEW;
      s->opt[OPT_PREVIEW].title = SANE_TITLE_PREVIEW;
      s->opt[OPT_PREVIEW].desc  = SANE_DESC_PREVIEW;
      s->opt[OPT_PREVIEW].cap   = SANE_CAP_SOFT_DETECT | SANE_CAP_SOFT_SELECT;
      s->val[OPT_PREVIEW].w     = 0;

      /* "Geometry" group: */
      s->opt[OPT_GEOMETRY_GROUP].name  = "geometry-group";
      s->opt[OPT_GEOMETRY_GROUP].title = SANE_I18N("Geometry");
      s->opt[OPT_GEOMETRY_GROUP].desc  = "";
      s->opt[OPT_GEOMETRY_GROUP].type  = SANE_TYPE_GROUP;
      s->opt[OPT_GEOMETRY_GROUP].cap   = SANE_CAP_ADVANCED;

      /* top-left x */
      s->opt[OPT_TL_X].name  = SANE_NAME_SCAN_TL_X;
      s->opt[OPT_TL_X].title = SANE_TITLE_SCAN_TL_X;
      s->opt[OPT_TL_X].desc  = SANE_DESC_SCAN_TL_X;
      s->opt[OPT_TL_X].type  = SANE_TYPE_FIXED;
      s->opt[OPT_TL_X].unit  = SANE_UNIT_MM;
      s->opt[OPT_TL_X].constraint_type  = SANE_CONSTRAINT_RANGE;
      s->opt[OPT_TL_X].constraint.range = &s->hw->x_range;
      s->val[OPT_TL_X].w = SANE_FIX(_DEFAULT_TLX);

      /* top-left y */
      s->opt[OPT_TL_Y].name  = SANE_NAME_SCAN_TL_Y;
      s->opt[OPT_TL_Y].title = SANE_TITLE_SCAN_TL_Y;
      s->opt[OPT_TL_Y].desc  = SANE_DESC_SCAN_TL_Y;
      s->opt[OPT_TL_Y].type  = SANE_TYPE_FIXED;
      s->opt[OPT_TL_Y].unit  = SANE_UNIT_MM;
      s->opt[OPT_TL_Y].constraint_type  = SANE_CONSTRAINT_RANGE;
      s->opt[OPT_TL_Y].constraint.range = &s->hw->y_range;
      s->val[OPT_TL_Y].w = SANE_FIX(_DEFAULT_TLY);

      /* bottom-right x */
      s->opt[OPT_BR_X].name  = SANE_NAME_SCAN_BR_X;
      s->opt[OPT_BR_X].title = SANE_TITLE_SCAN_BR_X;
      s->opt[OPT_BR_X].desc  = SANE_DESC_SCAN_BR_X;
      s->opt[OPT_BR_X].type  = SANE_TYPE_FIXED;
      s->opt[OPT_BR_X].unit  = SANE_UNIT_MM;
      s->opt[OPT_BR_X].constraint_type  = SANE_CONSTRAINT_RANGE;
      s->opt[OPT_BR_X].constraint.range = &s->hw->x_range;
      s->val[OPT_BR_X].w = SANE_FIX(_DEFAULT_BRX);

      /* bottom-right y */
      s->opt[OPT_BR_Y].name  = SANE_NAME_SCAN_BR_Y;
      s->opt[OPT_BR_Y].title = SANE_TITLE_SCAN_BR_Y;
      s->opt[OPT_BR_Y].desc  = SANE_DESC_SCAN_BR_Y;
      s->opt[OPT_BR_Y].type  = SANE_TYPE_FIXED;
      s->opt[OPT_BR_Y].unit  = SANE_UNIT_MM;
      s->opt[OPT_BR_Y].constraint_type  = SANE_CONSTRAINT_RANGE;
      s->opt[OPT_BR_Y].constraint.range = &s->hw->y_range;
      s->val[OPT_BR_Y].w = SANE_FIX(_DEFAULT_BRY);

      /* "Enhancement" group: */
      s->opt[OPT_ENHANCEMENT_GROUP].title = SANE_I18N("Enhancement");   
      s->opt[OPT_ENHANCEMENT_GROUP].desc  = "";
      s->opt[OPT_ENHANCEMENT_GROUP].type  = SANE_TYPE_GROUP;
      s->opt[OPT_ENHANCEMENT_GROUP].cap   = 0;
      s->opt[OPT_ENHANCEMENT_GROUP].constraint_type = SANE_CONSTRAINT_NONE;

      initGammaSettings( s );

      /* grayscale gamma vector */
      s->opt[OPT_GAMMA_VECTOR].name  = SANE_NAME_GAMMA_VECTOR;
      s->opt[OPT_GAMMA_VECTOR].title = SANE_TITLE_GAMMA_VECTOR;
      s->opt[OPT_GAMMA_VECTOR].desc  = SANE_DESC_GAMMA_VECTOR;
      s->opt[OPT_GAMMA_VECTOR].type  = SANE_TYPE_INT;
      s->opt[OPT_GAMMA_VECTOR].unit  = SANE_UNIT_NONE;
      s->opt[OPT_GAMMA_VECTOR].constraint_type = SANE_CONSTRAINT_RANGE;
      s->val[OPT_GAMMA_VECTOR].wa   = &(s->gamma_table[0][0]);
      s->opt[OPT_GAMMA_VECTOR].constraint.range = &(s->gamma_range);
      s->opt[OPT_GAMMA_VECTOR].size = s->gamma_length * sizeof(SANE_Word);

      /* red gamma vector */
      s->opt[OPT_GAMMA_VECTOR_R].name  = SANE_NAME_GAMMA_VECTOR_R;
      s->opt[OPT_GAMMA_VECTOR_R].title = SANE_TITLE_GAMMA_VECTOR_R;
      s->opt[OPT_GAMMA_VECTOR_R].desc  = SANE_DESC_GAMMA_VECTOR_R;
      s->opt[OPT_GAMMA_VECTOR_R].type  = SANE_TYPE_INT;
      s->opt[OPT_GAMMA_VECTOR_R].unit  = SANE_UNIT_NONE;
      s->opt[OPT_GAMMA_VECTOR_R].constraint_type = SANE_CONSTRAINT_RANGE;
      s->val[OPT_GAMMA_VECTOR_R].wa   = &(s->gamma_table[1][0]);
      s->opt[OPT_GAMMA_VECTOR_R].constraint.range = &(s->gamma_range);
      s->opt[OPT_GAMMA_VECTOR_R].size = s->gamma_length * sizeof(SANE_Word);

      /* green gamma vector */
      s->opt[OPT_GAMMA_VECTOR_G].name  = SANE_NAME_GAMMA_VECTOR_G;
      s->opt[OPT_GAMMA_VECTOR_G].title = SANE_TITLE_GAMMA_VECTOR_G;
      s->opt[OPT_GAMMA_VECTOR_G].desc  = SANE_DESC_GAMMA_VECTOR_G;
      s->opt[OPT_GAMMA_VECTOR_G].type  = SANE_TYPE_INT;
      s->opt[OPT_GAMMA_VECTOR_G].unit  = SANE_UNIT_NONE;
      s->opt[OPT_GAMMA_VECTOR_G].constraint_type = SANE_CONSTRAINT_RANGE;
      s->val[OPT_GAMMA_VECTOR_G].wa   = &(s->gamma_table[2][0]);
      s->opt[OPT_GAMMA_VECTOR_G].constraint.range = &(s->gamma_range);
      s->opt[OPT_GAMMA_VECTOR_G].size = s->gamma_length * sizeof(SANE_Word);

      /* blue gamma vector */
      s->opt[OPT_GAMMA_VECTOR_B].name  = SANE_NAME_GAMMA_VECTOR_B;
      s->opt[OPT_GAMMA_VECTOR_B].title = SANE_TITLE_GAMMA_VECTOR_B;
      s->opt[OPT_GAMMA_VECTOR_B].desc  = SANE_DESC_GAMMA_VECTOR_B;
      s->opt[OPT_GAMMA_VECTOR_B].type  = SANE_TYPE_INT;
      s->opt[OPT_GAMMA_VECTOR_B].unit  = SANE_UNIT_NONE;
      s->opt[OPT_GAMMA_VECTOR_B].constraint_type = SANE_CONSTRAINT_RANGE;
      s->val[OPT_GAMMA_VECTOR_B].wa   = &(s->gamma_table[3][0]);
      s->opt[OPT_GAMMA_VECTOR_B].constraint.range = &(s->gamma_range);
      s->opt[OPT_GAMMA_VECTOR_B].size = s->gamma_length * sizeof(SANE_Word);

      /* GAMMA stuff is disabled per default */ 
      s->opt[OPT_GAMMA_VECTOR].cap   |= SANE_CAP_INACTIVE;
      s->opt[OPT_GAMMA_VECTOR_R].cap |= SANE_CAP_INACTIVE;
      s->opt[OPT_GAMMA_VECTOR_G].cap |= SANE_CAP_INACTIVE;
      s->opt[OPT_GAMMA_VECTOR_B].cap |= SANE_CAP_INACTIVE;

      /* disable extended mode list for devices without TPA */
      if( 0 == (s->hw->caps.dwFlag & SFLAG_TPA))
            s->opt[OPT_EXT_MODE].cap |= SANE_CAP_INACTIVE;

      /* "Device settings" group: */
      s->opt[OPT_DEVICE_GROUP].name  = "device-settings";
      s->opt[OPT_DEVICE_GROUP].title = SANE_I18N("Device-Settings");
      s->opt[OPT_DEVICE_GROUP].desc  = "";
      s->opt[OPT_DEVICE_GROUP].type  = SANE_TYPE_GROUP;
      s->opt[OPT_DEVICE_GROUP].cap   = 0;
      s->opt[OPT_DEVICE_GROUP].constraint_type = SANE_CONSTRAINT_NONE;

      s->opt[OPT_LAMPSWITCH].name  = "lamp-switch";
      s->opt[OPT_LAMPSWITCH].title = SANE_I18N("Lampswitch");;
      s->opt[OPT_LAMPSWITCH].desc  = SANE_I18N("Manually switching the lamp(s).");
      s->opt[OPT_LAMPSWITCH].type  = SANE_TYPE_BOOL;
      s->val[OPT_LAMPSWITCH].w     = SANE_FALSE;

      s->opt[OPT_CACHECAL].name  = "calibration-cache";
      s->opt[OPT_CACHECAL].title = SANE_I18N("Calibration data cache");;
      s->opt[OPT_CACHECAL].desc  = SANE_I18N("Enables or disables calibration data cache.");
      s->opt[OPT_CACHECAL].type  = SANE_TYPE_BOOL;
      s->val[OPT_CACHECAL].w     = adj->cacheCalData;

      s->opt[OPT_LAMPOFF_ONEND].name  = SANE_NAME_LAMP_OFF_AT_EXIT;
      s->opt[OPT_LAMPOFF_ONEND].title = SANE_TITLE_LAMP_OFF_AT_EXIT;
      s->opt[OPT_LAMPOFF_ONEND].desc  = SANE_DESC_LAMP_OFF_AT_EXIT;
      s->opt[OPT_LAMPOFF_ONEND].type  = SANE_TYPE_BOOL;
      s->val[OPT_LAMPOFF_ONEND].w     = adj->lampOffOnEnd;

      s->opt[OPT_WARMUPTIME].name  = "warmup-time";
      s->opt[OPT_WARMUPTIME].title = SANE_I18N("Warmup-time");;
      s->opt[OPT_WARMUPTIME].desc  = SANE_I18N("Warmup-time in seconds.");
      s->opt[OPT_WARMUPTIME].type  = SANE_TYPE_INT;
      s->opt[OPT_WARMUPTIME].constraint_type = SANE_CONSTRAINT_RANGE;
      s->opt[OPT_WARMUPTIME].constraint.range = &warmup_range;
      s->val[OPT_WARMUPTIME].w     = adj->warmup;

      s->opt[OPT_LAMPOFF_TIMER].name  = "lampoff-time";
      s->opt[OPT_LAMPOFF_TIMER].title = SANE_I18N("Lampoff-time");;
      s->opt[OPT_LAMPOFF_TIMER].desc  = SANE_I18N("Lampoff-time in seconds.");
      s->opt[OPT_LAMPOFF_TIMER].type  = SANE_TYPE_INT;
      s->opt[OPT_LAMPOFF_TIMER].constraint_type = SANE_CONSTRAINT_RANGE;
      s->opt[OPT_LAMPOFF_TIMER].constraint.range = &offtimer_range;
      s->val[OPT_LAMPOFF_TIMER].w     = adj->lampOff;

      /* "Analog Frontend" group*/
      s->opt[OPT_AFE_GROUP].name  = "afe-group";
      s->opt[OPT_AFE_GROUP].title = SANE_I18N("Analog frontend");
      s->opt[OPT_AFE_GROUP].desc  = "";
      s->opt[OPT_AFE_GROUP].type  = SANE_TYPE_GROUP;
      s->opt[OPT_AFE_GROUP].cap   = 0;
      
      s->opt[OPT_OVR_REDGAIN].name  = "red-gain";
      s->opt[OPT_OVR_REDGAIN].title = SANE_I18N("Red gain");
      s->opt[OPT_OVR_REDGAIN].desc  = SANE_I18N("Red gain value of the AFE");
      s->opt[OPT_OVR_REDGAIN].type  = SANE_TYPE_INT;
      s->opt[OPT_OVR_REDGAIN].constraint_type = SANE_CONSTRAINT_RANGE;
      s->opt[OPT_OVR_REDGAIN].constraint.range = &gain_range;
      s->val[OPT_OVR_REDGAIN].w     = adj->rgain;

      s->opt[OPT_OVR_REDOFS].name  = "red-offset";
      s->opt[OPT_OVR_REDOFS].title = SANE_I18N("Red offset");
      s->opt[OPT_OVR_REDOFS].desc  = SANE_I18N("Red offset value of the AFE");
      s->opt[OPT_OVR_REDOFS].type  = SANE_TYPE_INT;
      s->opt[OPT_OVR_REDOFS].constraint_type = SANE_CONSTRAINT_RANGE;
      s->opt[OPT_OVR_REDOFS].constraint.range = &gain_range;
      s->val[OPT_OVR_REDOFS].w     = adj->rofs;

      s->opt[OPT_OVR_GREENGAIN].name  = "green-gain";
      s->opt[OPT_OVR_GREENGAIN].title = SANE_I18N("Green gain");
      s->opt[OPT_OVR_GREENGAIN].desc  = SANE_I18N("Green gain value of the AFE");
      s->opt[OPT_OVR_GREENGAIN].type  = SANE_TYPE_INT;
      s->opt[OPT_OVR_GREENGAIN].constraint_type = SANE_CONSTRAINT_RANGE;
      s->opt[OPT_OVR_GREENGAIN].constraint.range = &gain_range;
      s->val[OPT_OVR_GREENGAIN].w     = adj->ggain;

      s->opt[OPT_OVR_GREENOFS].name  = "green-offset";
      s->opt[OPT_OVR_GREENOFS].title = SANE_I18N("Green offset");
      s->opt[OPT_OVR_GREENOFS].desc  = SANE_I18N("Green offset value of the AFE");
      s->opt[OPT_OVR_GREENOFS].type  = SANE_TYPE_INT;
      s->opt[OPT_OVR_GREENOFS].constraint_type = SANE_CONSTRAINT_RANGE;
      s->opt[OPT_OVR_GREENOFS].constraint.range = &gain_range;
      s->val[OPT_OVR_GREENOFS].w     = adj->gofs;

      s->opt[OPT_OVR_BLUEGAIN].name  = "blue-gain";
      s->opt[OPT_OVR_BLUEGAIN].title = SANE_I18N("Blue gain");
      s->opt[OPT_OVR_BLUEGAIN].desc  = SANE_I18N("Blue gain value of the AFE");
      s->opt[OPT_OVR_BLUEGAIN].type  = SANE_TYPE_INT;
      s->opt[OPT_OVR_BLUEGAIN].constraint_type = SANE_CONSTRAINT_RANGE;
      s->opt[OPT_OVR_BLUEGAIN].constraint.range = &gain_range;
      s->val[OPT_OVR_BLUEGAIN].w     = adj->bgain;

      s->opt[OPT_OVR_BLUEOFS].name  = "blue-offset";
      s->opt[OPT_OVR_BLUEOFS].title = SANE_I18N("Blue offset");
      s->opt[OPT_OVR_BLUEOFS].desc  = SANE_I18N("Blue offset value of the AFE");
      s->opt[OPT_OVR_BLUEOFS].type  = SANE_TYPE_INT;
      s->opt[OPT_OVR_BLUEOFS].constraint_type = SANE_CONSTRAINT_RANGE;
      s->opt[OPT_OVR_BLUEOFS].constraint.range = &gain_range;
      s->val[OPT_OVR_BLUEOFS].w     = adj->bofs;

      s->opt[OPT_OVR_RED_LOFF].name  = "redlamp-off";
      s->opt[OPT_OVR_RED_LOFF].title = SANE_I18N("Red lamp off");
      s->opt[OPT_OVR_RED_LOFF].desc  = SANE_I18N("Defines red lamp off parameter");
      s->opt[OPT_OVR_RED_LOFF].type  = SANE_TYPE_INT;
      s->opt[OPT_OVR_RED_LOFF].constraint_type = SANE_CONSTRAINT_RANGE;
      s->opt[OPT_OVR_RED_LOFF].constraint.range = &loff_range;
      s->val[OPT_OVR_RED_LOFF].w     = adj->rlampoff;

      s->opt[OPT_OVR_GREEN_LOFF].name  = "greenlamp-off";
      s->opt[OPT_OVR_GREEN_LOFF].title = SANE_I18N("Green lamp off");
      s->opt[OPT_OVR_GREEN_LOFF].desc  = SANE_I18N("Defines green lamp off parameter");
      s->opt[OPT_OVR_GREEN_LOFF].type  = SANE_TYPE_INT;
      s->opt[OPT_OVR_GREEN_LOFF].constraint_type = SANE_CONSTRAINT_RANGE;
      s->opt[OPT_OVR_GREEN_LOFF].constraint.range = &loff_range;
      s->val[OPT_OVR_GREEN_LOFF].w     = adj->glampoff;

      s->opt[OPT_OVR_BLUE_LOFF].name  = "bluelamp-off";
      s->opt[OPT_OVR_BLUE_LOFF].title = SANE_I18N("Blue lamp off");
      s->opt[OPT_OVR_BLUE_LOFF].desc  = SANE_I18N("Defines blue lamp off parameter");
      s->opt[OPT_OVR_BLUE_LOFF].type  = SANE_TYPE_INT;
      s->opt[OPT_OVR_BLUE_LOFF].constraint_type = SANE_CONSTRAINT_RANGE;
      s->opt[OPT_OVR_BLUE_LOFF].constraint.range = &loff_range;
      s->val[OPT_OVR_BLUE_LOFF].w     = adj->blampoff;

      /* only available for CIS devices*/
      if( !usb_IsCISDevice( dev )) {
            s->opt[OPT_OVR_RED_LOFF].cap   |= SANE_CAP_INACTIVE;
            s->opt[OPT_OVR_GREEN_LOFF].cap |= SANE_CAP_INACTIVE;
            s->opt[OPT_OVR_BLUE_LOFF].cap  |= SANE_CAP_INACTIVE;
      }

      return SANE_STATUS_GOOD;
}

/** Function to retrieve the vendor and product id from a given string
 * @param src  - string, that should be investigated
 * @param dest - pointer to a string to receive the USB ID
 */
00965 static void decodeUsbIDs( char *src, char **dest )
{           
      const char *name; 
      char       *tmp = *dest;
      int         len = strlen(_SECTION);

      if( isspace(src[len])) {
            strncpy( tmp, &src[len+1], (strlen(src)-(len+1)));
        tmp[(strlen(src)-(len+1))] = '\0';
      }

      name = tmp;
      name = sanei_config_skip_whitespace( name );

      if( '\0' == name[0] ) {
            DBG( _DBG_SANE_INIT, "next device uses autodetection\n" );
      } else {
                  
            u_short pi = 0, vi = 0;

            if( *name ) {                              
      
                  name = sanei_config_get_string( name, &tmp );
                  if( tmp ) {
                  vi = strtol( tmp, 0, 0 );
                      free( tmp );
                  }
          }

            name = sanei_config_skip_whitespace( name );
            if( *name ) {

                  name = sanei_config_get_string( name, &tmp );
                  if( tmp ) {
                        pi = strtol( tmp, 0, 0 );
                        free( tmp );
                  }
            }

            /* create what we need to go through our device list...*/
            sprintf( *dest, "0x%04X-0x%04X", vi, pi );
            DBG( _DBG_SANE_INIT, "next device is a USB device (%s)\n", *dest );
      }
}

#define _INT   0
#define _FLOAT 1

/** function to decode an value and give it back to the caller.
 * @param src    -  pointer to the source string to check
 * @param opt    -  string that keeps the option name to check src for
 * @param what   - _FLOAT or _INT
 * @param result -  pointer to the var that should receive our result
 * @param def    - default value that result should be in case of any error
 * @return The function returns SANE_TRUE if the option has been found,
 *         if not, it returns SANE_FALSE
 */
01022 static SANE_Bool decodeVal( char *src, char *opt,
                            int what, void *result, void *def )
{
      char       *tmp, *tmp2;
      const char *name;

      /* skip the option string */
      name = (const char*)&src[strlen("option")];

      /* get the name of the option */
      name = sanei_config_get_string( name, &tmp );

      if( tmp ) {

            /* on success, compare wiht the given one */
            if( 0 == strcmp( tmp, opt )) {

                  DBG( _DBG_SANE_INIT, "Decoding option >%s<\n", opt );

                  if( _INT == what ) {

                        /* assign the default value for this option... */
                        *((int*)result) = *((int*)def);

                        if( *name ) {

                              /* get the configuration value and decode it */
                              name = sanei_config_get_string( name, &tmp2 );

                              if( tmp2 ) {
                                    *((int*)result) = strtol( tmp2, 0, 0 );
                                    free( tmp2 );
                              }
                        }
                        free( tmp );      
                        return SANE_TRUE;

                  } else if( _FLOAT == what ) {

                        /* assign the default value for this option... */
                        *((double*)result) = *((double*)def);

                        if( *name ) {

                              /* get the configuration value and decode it */
                              name = sanei_config_get_string( name, &tmp2 );

                              if( tmp2 ) {
                                    *((double*)result) = strtod( tmp2, 0 );
                                    free( tmp2 );
                              }
                        }
                        free( tmp );      
                        return SANE_TRUE;
                  }
            }
            free( tmp );
      }
      return SANE_FALSE;
}

/** function to retrive the device name of a given string
 * @param src  -  string that keeps the option name to check src for
 * @param dest -  pointer to the string, that should receive the detected
 *                devicename
 * @return The function returns SANE_TRUE if the devicename has been found,
 *         if not, it returns SANE_FALSE
 */
01090 static SANE_Bool decodeDevName( char *src, char *dest )
{
      char       *tmp;  
      const char *name;

      if( 0 == strncmp( "device", src, 6 )) {

            name = (const char*)&src[strlen("device")];
            name = sanei_config_skip_whitespace( name );

            DBG( _DBG_SANE_INIT, "Decoding device name >%s<\n", name );

            if( *name ) {
                  name = sanei_config_get_string( name, &tmp );
                  if( tmp ) {

                        strcpy( dest, tmp );
                        free( tmp );
                        return SANE_TRUE;
                  }
            }
      }
      return SANE_FALSE;
}

/** attach a device to the backend
 */
01117 static SANE_Status attach( const char *dev_name,
                           pCnfDef cnf, Plustek_Device **devp )
{
      int             cntr;
      int             result;
      int             handle;
      Plustek_Device *dev;

      DBG( _DBG_SANE_INIT, "attach (%s, %p, %p)\n",
                                            dev_name, (void *)cnf, (void *)devp);
      /* already attached ?*/
      for( dev = first_dev; dev; dev = dev->next ) {

            if( 0 == strcmp( dev->sane.name, dev_name )) {
                  if( devp )
                        *devp = dev;

                  return SANE_STATUS_GOOD;
            }
      }

      /* allocate some memory for the device */
      dev = malloc( sizeof (*dev));
      if( NULL == dev )
            return SANE_STATUS_NO_MEM;

      /* assign all the stuff we need fo this device... */

      memset(dev, 0, sizeof (*dev));

      dev->fd           = -1;
      dev->name         = strdup(dev_name);    /* hold it double to avoid   */
      dev->sane.name    = dev->name;           /* compiler warnings         */
      dev->sane.vendor  = "Plustek";
      dev->initialized  = -1;                  /* will be used as index too */
      dev->calFile      = NULL;

      memcpy( &dev->adj, &cnf->adj, sizeof(AdjDef));

      show_cnf( cnf );

      dev->sane.type = "USB flatbed scanner";

#ifdef _PLUSTEK_USB
      strncpy( dev->usbId, cnf->usbId, _MAX_ID_LEN );

      if( cnf->adj.lampOff >= 0 )
            dev->usbDev.dwLampOnPeriod = cnf->adj.lampOff;

      if( cnf->adj.lampOffOnEnd >= 0 )
            dev->usbDev.bLampOffOnEnd = cnf->adj.lampOffOnEnd;
#else
      free( dev->name );
      free( dev );
      DBG( _DBG_ERROR, "Backend non-functional on this platform :-(\n" );
      return SANE_STATUS_INVAL;
#endif

      /* go ahead and open the scanner device */
      handle = usbDev_open( dev );
      if( handle < 0 ) {
            DBG( _DBG_ERROR,"open failed: %d\n", handle );
            return SANE_STATUS_IO_ERROR;
      }

      /* okay, so assign the handle... */
      dev->fd = handle;

      result = usbDev_getCaps( dev );
      if( result < 0 ) {
            DBG( _DBG_ERROR, "usbDev_getCaps() failed(%d)\n", result);
            usbDev_close(dev);
            return SANE_STATUS_IO_ERROR;
      }

      /* save the info we got from the driver */
      DBG( _DBG_INFO, "Scanner information:\n" );
#ifdef _PLUSTEK_USB
      if( NULL != dev->usbDev.ModelStr )
            dev->sane.model = dev->usbDev.ModelStr;
      else
#endif
            dev->sane.model = "USB-Device";

      DBG( _DBG_INFO, "Vendor : %s\n",      dev->sane.vendor  );
      DBG( _DBG_INFO, "Model  : %s\n",      dev->sane.model   );
      DBG( _DBG_INFO, "Flags  : 0x%08lx\n", dev->caps.dwFlag  );

      dev->max_x = dev->caps.wMaxExtentX*MM_PER_INCH/_MEASURE_BASE;
      dev->max_y = dev->caps.wMaxExtentY*MM_PER_INCH/_MEASURE_BASE;

      /* calculate the size of the resolution list +
       * one more to avoid a buffer overflow, then allocate it...
       */
      dev->res_list = (SANE_Int *)
                       calloc((((dev->usbDev.Caps.OpticDpi.x*16)-_DEF_DPI)/25+1),
                       sizeof (SANE_Int));  

      if (NULL == dev->res_list) {
            DBG( _DBG_ERROR, "alloc fail, resolution problem\n" );
            usbDev_close(dev);
            return SANE_STATUS_INVAL;
      }

      /* build up the resolution table */
      dev->res_list_size = 0;
      for(cntr = _DEF_DPI; cntr <= (dev->usbDev.Caps.OpticDpi.x*16); cntr += 25){
            dev->res_list_size++;
            dev->res_list[dev->res_list_size - 1] = (SANE_Int)cntr;
      }

      /* set the limits */
      dev->dpi_range.min   = _DEF_DPI;
      dev->dpi_range.max   = dev->usbDev.Caps.OpticDpi.x * 2;
      dev->x_range.max     = SANE_FIX(dev->max_x);
      dev->y_range.max     = SANE_FIX(dev->max_y);

      dev->fd = handle;
      drvclose( dev );

      DBG( _DBG_SANE_INIT, "attach: model = >%s<\n", dev->sane.model );

      ++num_devices;
      dev->next = first_dev;
      first_dev = dev;

      if (devp)
            *devp = dev;

      return SANE_STATUS_GOOD;
}

/** function to preset a configuration structure
 * @param cnf - pointer to the structure that should be initialized
 */
01252 static void init_config_struct( pCnfDef cnf )
{
      memset( cnf, 0, sizeof(CnfDef));

      cnf->adj.warmup       = -1;
      cnf->adj.lampOff      = -1;
      cnf->adj.lampOffOnEnd = -1;

      cnf->adj.posShadingY  = -1;
      cnf->adj.tpaShadingY  = -1;
      cnf->adj.negShadingY  = -1;
      cnf->adj.rgain        = -1;
      cnf->adj.ggain        = -1;
      cnf->adj.bgain        = -1;
      cnf->adj.rofs         = -1;
      cnf->adj.gofs         = -1;
      cnf->adj.bofs         = -1;
      cnf->adj.rlampoff     = -1;
      cnf->adj.glampoff     = -1;
      cnf->adj.blampoff     = -1;

      cnf->adj.graygamma = 1.0;
      cnf->adj.rgamma    = 1.0;
      cnf->adj.ggamma    = 1.0;
      cnf->adj.bgamma    = 1.0;
}

/** intialize the backend
 */
SANE_Status
01282 sane_init( SANE_Int *version_code, SANE_Auth_Callback authorize )
{
      char     str[PATH_MAX] = _DEFAULT_DEVICE;
      CnfDef   config;
      size_t   len;
      FILE    *fp;

      DBG_INIT();

#ifdef _PLUSTEK_USB
      sanei_usb_init();
      sanei_lm983x_init();
#endif      
      sanei_thread_init();

#if defined PACKAGE && defined VERSION
      DBG( _DBG_INFO, "Plustek backend V"BACKEND_VERSION", part of "
                                            PACKAGE " " VERSION "\n");
#else
      DBG( _DBG_INFO, "Plustek backend V"BACKEND_VERSION"\n" );
#endif

      /* do some presettings... */
      auth         = authorize;
      first_dev    = NULL;
      first_handle = NULL;
      num_devices  = 0;

      /* initialize the configuration structure */                
      init_config_struct( &config );

      if( version_code != NULL )
            *version_code = SANE_VERSION_CODE(V_MAJOR, V_MINOR, 0);

      fp = sanei_config_open( PLUSTEK_CONFIG_FILE );

      /* default to _DEFAULT_DEVICE instead of insisting on config file */
      if( NULL == fp ) {
            return attach( _DEFAULT_DEVICE, &config, 0 );
      }

      while( sanei_config_read( str, sizeof(str), fp)) {
            
            DBG( _DBG_SANE_INIT, ">%s<\n", str );
            if( str[0] == '#')            /* ignore line comments */
                  continue;

            len = strlen(str);
            if( 0 == len )
                  continue;     /* ignore empty lines */

            /* check for options */
            if( 0 == strncmp(str, "option", 6)) {

                  int    ival;
                  double dval;
            
                  ival = -1;
                  decodeVal( str, "warmup",    _INT, &config.adj.warmup,      &ival);
                  decodeVal( str, "lampOff",   _INT, &config.adj.lampOff,     &ival);
                  decodeVal( str, "lOffOnEnd", _INT, &config.adj.lampOffOnEnd,&ival);
                  decodeVal( str, "posShadingY",_INT, &config.adj.posShadingY,&ival);
                  decodeVal( str, "tpaShadingY",_INT, &config.adj.tpaShadingY,&ival);
                  decodeVal( str, "negShadingY",_INT, &config.adj.negShadingY,&ival);
                  decodeVal( str, "red_gain",   _INT, &config.adj.rgain,      &ival);
                  decodeVal( str, "green_gain", _INT, &config.adj.ggain,      &ival);
                  decodeVal( str, "blue_gain",  _INT, &config.adj.bgain,      &ival);
                  decodeVal( str, "red_offset",    _INT, &config.adj.rofs,    &ival);
                  decodeVal( str, "green_offset" , _INT, &config.adj.gofs,    &ival);
                  decodeVal( str, "blue_offset",   _INT, &config.adj.bofs,    &ival);
                  decodeVal( str, "red_lampoff",   _INT, &config.adj.rlampoff,&ival);
                  decodeVal( str, "green_lampoff", _INT, &config.adj.glampoff,&ival);
                  decodeVal( str, "blue_lampoff",  _INT, &config.adj.blampoff,&ival);
                  
                  ival = 0;
                  decodeVal( str, "enableTPA", _INT, &config.adj.enableTpa, &ival);
                  decodeVal( str, "cacheCalData",
                                                           _INT, &config.adj.cacheCalData,&ival);
                  decodeVal( str, "altCalibration",
                                                           _INT, &config.adj.altCalibrate,&ival);
                  decodeVal( str, "skipCalibration",
                                                        _INT, &config.adj.skipCalibration,&ival);
                  decodeVal( str, "skipFine",
                                                        _INT, &config.adj.skipFine,&ival);
                  decodeVal( str, "skipFineWhite",
                                                        _INT, &config.adj.skipFineWhite,&ival);
                  decodeVal( str, "invertNegatives",
                                                        _INT, &config.adj.invertNegatives,&ival);
                  decodeVal( str, "disableSpeedup",
                                                        _INT, &config.adj.disableSpeedup,&ival);

                  decodeVal( str, "posOffX", _INT, &config.adj.pos.x, &ival );
                  decodeVal( str, "posOffY", _INT, &config.adj.pos.y, &ival );

                  decodeVal( str, "negOffX", _INT, &config.adj.neg.x, &ival );
                  decodeVal( str, "negOffY", _INT, &config.adj.neg.y, &ival );

                  decodeVal( str, "tpaOffX", _INT, &config.adj.tpa.x, &ival );
                  decodeVal( str, "tpaOffY", _INT, &config.adj.tpa.y, &ival );

                  decodeVal( str, "mov", _INT, &config.adj.mov, &ival);

                  dval = 1.0;
                  decodeVal( str, "grayGamma",  _FLOAT, &config.adj.graygamma,&dval);
                  decodeVal( str, "redGamma",   _FLOAT, &config.adj.rgamma, &dval );
                  decodeVal( str, "greenGamma", _FLOAT, &config.adj.ggamma, &dval );
                  decodeVal( str, "blueGamma",  _FLOAT, &config.adj.bgamma, &dval );
                  continue;

            /* check for sections: */
            } else if( 0 == strncmp( str, _SECTION, strlen(_SECTION))) {
            
                char *tmp;
            
                /* new section, try and attach previous device */
                if( config.devName[0] != '\0' ) {
                        attach( config.devName, &config, 0 );
                  } else {
                        if( first_dev != NULL ) {
                              DBG( _DBG_WARNING, "section contains no device name,"
                                                 " ignored!\n" );
                         }
                  }
            
                  /* re-initialize the configuration structure */
                  init_config_struct( &config );
            
                  tmp = config.usbId;
                  decodeUsbIDs( str, &tmp );
            
                  DBG( _DBG_SANE_INIT, "... next device\n" );
                  continue;                     

            } else if( SANE_TRUE == decodeDevName( str, config.devName )) {
                  continue;
            }
            
            /* ignore other stuff... */
            DBG( _DBG_SANE_INIT, "ignoring >%s<\n", str );
      }
      fclose (fp);

      /* try to attach the last device in the config file... */
      if( config.devName[0] != '\0' )
            attach( config.devName, &config, 0 );

      return SANE_STATUS_GOOD;
}

/** cleanup the backend...
 */
void
01434 sane_exit( void )
{
      Plustek_Device *dev, *next;

      DBG( _DBG_SANE_INIT, "sane_exit\n" );

      for( dev = first_dev; dev; ) {

            next = dev->next;

            /* call the shutdown function of each device... */
            usbDev_shutdown( dev );

            /* we're doin' this to avoid compiler warnings as dev->sane.name
             * is defined as const char*
             */
            if( dev->sane.name )
                  free( dev->name );

            if( dev->calFile )
                  free( dev->calFile );
            
        if( dev->res_list )
                  free( dev->res_list );
            free( dev );

            dev = next;
      }

      if( devlist )
            free( devlist );

      devlist      = NULL;
      auth         = NULL;
      first_dev    = NULL;
      first_handle = NULL;
}

/** return a list of all devices
 */
SANE_Status
01475 sane_get_devices(const SANE_Device ***device_list, SANE_Bool local_only )
{
      int             i;
      Plustek_Device *dev;

      DBG(_DBG_SANE_INIT, "sane_get_devices (%p, %ld)\n",
                                       (void *)device_list, (long) local_only);

      /* already called, so cleanup */
      if( devlist )
      free( devlist );

      devlist = malloc((num_devices + 1) * sizeof (devlist[0]));
      if ( NULL == devlist )
      return SANE_STATUS_NO_MEM;

      i = 0;
      for (dev = first_dev; i < num_devices; dev = dev->next)
      devlist[i++] = &dev->sane;
      devlist[i++] = 0;

      *device_list = devlist;
      return SANE_STATUS_GOOD;
}

/** open the sane device
 */
SANE_Status
01503 sane_open( SANE_String_Const devicename, SANE_Handle* handle )
{
      SANE_Status      status;
      Plustek_Device  *dev;
      Plustek_Scanner *s;
    CnfDef           config;

      DBG( _DBG_SANE_INIT, "sane_open - %s\n", devicename );

      if( devicename[0] ) {
      for( dev = first_dev; dev; dev = dev->next ) {
                  if( strcmp( dev->sane.name, devicename ) == 0 )
                        break;
        }

            if( !dev ) {

                  memset( &config, 0, sizeof(CnfDef));
                  
                  status = attach( devicename, &config, &dev );
                  if( SANE_STATUS_GOOD != status )
                        return status;
            }
      } else {
            /* empty devicename -> use first device */
            dev = first_dev;
      }

      if( !dev )
      return SANE_STATUS_INVAL;

      s = malloc (sizeof (*s));
      if( NULL == s )
      return SANE_STATUS_NO_MEM;

      memset(s, 0, sizeof (*s));
      s->r_pipe   = -1;
      s->w_pipe   = -1;
      s->hw       = dev;
      s->scanning = SANE_FALSE;

      init_options(s);

      /* insert newly opened handle into list of open handles: */
      s->next      = first_handle;
      first_handle = s;

      *handle = s;
      
      return SANE_STATUS_GOOD;
}

/**
 */
void
01558 sane_close( SANE_Handle handle )
{
      Plustek_Scanner *prev, *s;

      DBG( _DBG_SANE_INIT, "sane_close\n" );

      /* remove handle from list of open handles: */
      prev = 0;

      for( s = first_handle; s; s = s->next ) {
            if( s == handle )
                  break;
            prev = s;
      }

      if (!s) {
            DBG( _DBG_ERROR, "close: invalid handle %p\n", handle);
            return;
      }

      close_pipe( s );

      if( NULL != s->buf )
            free(s->buf);

      drvclose( s->hw );

      if (prev)
            prev->next = s->next;
      else
            first_handle = s->next;

      free(s);
}

/** goes through a string list and returns the start-address of the string
 * that has been found, or NULL on error
 */
static const SANE_String_Const*
01597 search_string_list( const SANE_String_Const *list, SANE_String value )
{
      while( *list != NULL && strcmp(value, *list) != 0 )
            ++list;

      if( *list == NULL )
            return NULL;

      return list;
}

/** return or set the parameter values, also do some checks
 */
SANE_Status
01611 sane_control_option( SANE_Handle handle, SANE_Int option,
                     SANE_Action action, void *value, SANE_Int * info )
{
      Plustek_Scanner         *s = (Plustek_Scanner *)handle;
      Plustek_Device          *dev = s->hw;
      AdjDef                  *adj = &dev->adj;
      SANE_Status              status;
      const SANE_String_Const *optval;
      int                      scanmode;

      if ( s->scanning )
            return SANE_STATUS_DEVICE_BUSY;

      if((option < 0) || (option >= NUM_OPTIONS))
            return SANE_STATUS_INVAL;

      if( NULL != info )
            *info = 0;

      switch( action ) {

            case SANE_ACTION_GET_VALUE:
                  switch (option) {
                  case OPT_PREVIEW:
                  case OPT_NUM_OPTS:
                  case OPT_RESOLUTION:
                  case OPT_BIT_DEPTH:
                  case OPT_TL_X:
                  case OPT_TL_Y:
                  case OPT_BR_X:
                  case OPT_BR_Y:
                  case OPT_LAMPSWITCH:
                  case OPT_CUSTOM_GAMMA:
                  case OPT_LAMPOFF_ONEND:
                  case OPT_CACHECAL:
                  case OPT_OVR_REDGAIN:
                  case OPT_OVR_GREENGAIN:
                  case OPT_OVR_BLUEGAIN:
                  case OPT_OVR_REDOFS:
                  case OPT_OVR_GREENOFS:
                  case OPT_OVR_BLUEOFS:
                  case OPT_OVR_RED_LOFF:
                  case OPT_OVR_GREEN_LOFF:
                  case OPT_OVR_BLUE_LOFF:
                  case OPT_LAMPOFF_TIMER:
                  case OPT_WARMUPTIME:
                        *(SANE_Word *)value = s->val[option].w;
                        break;

                  case OPT_CONTRAST:
                  case OPT_BRIGHTNESS:
                        *(SANE_Word *)value =
                                          (s->val[option].w << SANE_FIXED_SCALE_SHIFT);
                        break;

                  case OPT_MODE:
                  case OPT_EXT_MODE:
                        strcpy ((char *) value,
                                s->opt[option].constraint.string_list[s->val[option].w]);
                        break;
      
                  /* word array options: */
                  case OPT_GAMMA_VECTOR:
                        DBG( _DBG_INFO, "Reading MASTER gamma.\n" );
                        memcpy( value, s->val[option].wa, s->opt[option].size );
                        break;

                  case OPT_GAMMA_VECTOR_R:
                        DBG( _DBG_INFO, "Reading RED gamma.\n" );
                        memcpy( value, s->val[option].wa, s->opt[option].size );
                        break;

                  case OPT_GAMMA_VECTOR_G:
                        DBG( _DBG_INFO, "Reading GREEN gamma.\n" );
                        memcpy( value, s->val[option].wa, s->opt[option].size );
                        break;

                  case OPT_GAMMA_VECTOR_B:
                        DBG( _DBG_INFO, "Reading BLUE gamma.\n" );
                        memcpy( value, s->val[option].wa, s->opt[option].size );
                        break;

                  default:
                        return SANE_STATUS_INVAL;
            }
            break;

            case SANE_ACTION_SET_VALUE:
                  status = sanei_constrain_value( s->opt + option, value, info );
                  if( SANE_STATUS_GOOD != status )
                        return status;

                  optval = NULL;
                  if( SANE_CONSTRAINT_STRING_LIST == s->opt[option].constraint_type ) {

                        optval = search_string_list( s->opt[option].constraint.string_list,
                                                         (char *) value);
                        if( NULL == optval )
                              return SANE_STATUS_INVAL;
                  }

                  switch (option) {

                        case OPT_RESOLUTION: {
                              int n;
                              int min_d = dev->res_list[dev->res_list_size - 1];
                              int v     = *(SANE_Word *)value;
                              int best  = v;

                              for( n = 0; n < dev->res_list_size; n++ ) {
                                    int d = abs(v - dev->res_list[n]);

                                    if( d < min_d ) {
                                          min_d = d;
                                          best  = dev->res_list[n];
                                    }
                              }

                              s->val[option].w = (SANE_Word)best;

                              if( v != best )
                                    *(SANE_Word *)value = best;

                              if( NULL != info ) {
                                    if( v != best )   
                                          *info |= SANE_INFO_INEXACT;
                                    *info |= SANE_INFO_RELOAD_PARAMS;
                              }
                              break;
                        }

                        case OPT_PREVIEW:
                        case OPT_BIT_DEPTH:
                        case OPT_TL_X:
                        case OPT_TL_Y:
                        case OPT_BR_X:
                        case OPT_BR_Y:
                              s->val[option].w = *(SANE_Word *)value;
                              if( NULL != info )
                                    *info |= SANE_INFO_RELOAD_PARAMS;
                              break;

                        case OPT_CACHECAL:
                              s->val[option].w = *(SANE_Word *)value;
                              dev->adj.cacheCalData = s->val[option].w;
                              break;

                        case OPT_LAMPSWITCH:
                              s->val[option].w = *(SANE_Word *)value;
                              usb_LampSwitch( dev, s->val[option].w );
                              if( s->val[option].w == 0 )
                                    usb_StopLampTimer( dev );
                              else
                                    usb_StartLampTimer( dev );
                              break;

                        case OPT_LAMPOFF_ONEND:
                              s->val[option].w = *(SANE_Word *)value;
                              dev->adj.lampOffOnEnd = s->val[option].w;
                              usb_CheckAndCopyAdjs( dev );
                              break;

                        case OPT_CUSTOM_GAMMA:
                              s->val[option].w = *(SANE_Word *)value;
                              if( NULL != info )
                                    *info |= SANE_INFO_RELOAD_PARAMS | SANE_INFO_RELOAD_OPTIONS;

                              scanmode = getScanMode( s );

                              s->opt[OPT_GAMMA_VECTOR].cap   |= SANE_CAP_INACTIVE;
                              s->opt[OPT_GAMMA_VECTOR_R].cap |= SANE_CAP_INACTIVE;
                              s->opt[OPT_GAMMA_VECTOR_G].cap |= SANE_CAP_INACTIVE;
                              s->opt[OPT_GAMMA_VECTOR_B].cap |= SANE_CAP_INACTIVE;

                              if( SANE_TRUE == s->val[option].w ) {
                                    DBG( _DBG_INFO, "Using custom gamma settings.\n" );
                                    if((scanmode == COLOR_256GRAY) ||
                                       (scanmode == COLOR_GRAY16)) {
                                          s->opt[OPT_GAMMA_VECTOR].cap &= ~SANE_CAP_INACTIVE;
                                    } else {
                                          s->opt[OPT_GAMMA_VECTOR_R].cap &= ~SANE_CAP_INACTIVE;
                                          s->opt[OPT_GAMMA_VECTOR_G].cap &= ~SANE_CAP_INACTIVE;
                                          s->opt[OPT_GAMMA_VECTOR_B].cap &= ~SANE_CAP_INACTIVE;
                                    }
                              } else {

                                    DBG( _DBG_INFO, "NOT using custom gamma settings.\n" );
                                    initGammaSettings( s );

                                    if((scanmode == COLOR_256GRAY) ||
                                       (scanmode == COLOR_GRAY16)) {
                                          s->opt[OPT_GAMMA_VECTOR].cap |= SANE_CAP_INACTIVE;
                                    } else {
                                          s->opt[OPT_GAMMA_VECTOR_R].cap |= SANE_CAP_INACTIVE;
                                          s->opt[OPT_GAMMA_VECTOR_G].cap |= SANE_CAP_INACTIVE;
                                          s->opt[OPT_GAMMA_VECTOR_B].cap |= SANE_CAP_INACTIVE;
                                    }
                              }
                              break;

                        case OPT_LAMPOFF_TIMER:
                              s->val[option].w = (*(SANE_Word *)value);
                              adj->lampOff     = (*(SANE_Word *)value);
                              usb_CheckAndCopyAdjs( dev );
                              break;

                        case OPT_WARMUPTIME:
                              s->val[option].w = (*(SANE_Word *)value);
                              adj->warmup      = (*(SANE_Word *)value);
                              usb_CheckAndCopyAdjs( dev );
                              break;

                        case OPT_OVR_REDGAIN:
                              s->val[option].w = (*(SANE_Word *)value);
                              adj->rgain       = (*(SANE_Word *)value);
                              break;
                        case OPT_OVR_GREENGAIN:
                              s->val[option].w = (*(SANE_Word *)value);
                              adj->ggain       = (*(SANE_Word *)value);
                              break;
                        case OPT_OVR_BLUEGAIN:
                              s->val[option].w = (*(SANE_Word *)value);
                              adj->bgain       = (*(SANE_Word *)value);
                              break;
                        case OPT_OVR_REDOFS:
                              s->val[option].w = (*(SANE_Word *)value);
                              adj->rofs        = (*(SANE_Word *)value);
                              break;
                        case OPT_OVR_GREENOFS:
                              s->val[option].w = (*(SANE_Word *)value);
                              adj->gofs       = (*(SANE_Word *)value);
                              break;
                        case OPT_OVR_BLUEOFS:
                              s->val[option].w = (*(SANE_Word *)value);
                              adj->bofs        = (*(SANE_Word *)value);
                              break;
                        case OPT_OVR_RED_LOFF:
                              s->val[option].w = (*(SANE_Word *)value);
                              adj->rlampoff    = (*(SANE_Word *)value);
                              break;
                        case OPT_OVR_GREEN_LOFF:
                              s->val[option].w = (*(SANE_Word *)value);
                              adj->glampoff    = (*(SANE_Word *)value);
                              break;
                        case OPT_OVR_BLUE_LOFF:
                              s->val[option].w = (*(SANE_Word *)value);
                              adj->blampoff    = (*(SANE_Word *)value);
                              break;

                        case OPT_CONTRAST:
                        case OPT_BRIGHTNESS:
                              s->val[option].w =
                                   ((*(SANE_Word *)value) >> SANE_FIXED_SCALE_SHIFT);
                              break;

                        case OPT_MODE: 
                              s->val[option].w = optval - s->opt[option].constraint.string_list;
                              scanmode = getScanMode( s );
                              
                              s->opt[OPT_CONTRAST].cap     &= ~SANE_CAP_INACTIVE;
                              s->opt[OPT_CUSTOM_GAMMA].cap &= ~SANE_CAP_INACTIVE;
                              s->opt[OPT_BIT_DEPTH].cap    &= ~SANE_CAP_INACTIVE;

                              if( scanmode == COLOR_BW ) {
                                    s->opt[OPT_CONTRAST].cap     |= SANE_CAP_INACTIVE;
                                    s->opt[OPT_CUSTOM_GAMMA].cap |= SANE_CAP_INACTIVE;
                                    s->opt[OPT_BIT_DEPTH].cap    |= SANE_CAP_INACTIVE;
                              }

                              s->opt[OPT_GAMMA_VECTOR].cap   |= SANE_CAP_INACTIVE;
                              s->opt[OPT_GAMMA_VECTOR_R].cap |= SANE_CAP_INACTIVE;
                              s->opt[OPT_GAMMA_VECTOR_G].cap |= SANE_CAP_INACTIVE;
                              s->opt[OPT_GAMMA_VECTOR_B].cap |= SANE_CAP_INACTIVE;

                              if( s->val[OPT_CUSTOM_GAMMA].w &&
                                    !(s->opt[OPT_CUSTOM_GAMMA].cap & SANE_CAP_INACTIVE)) {

                                    if((scanmode == COLOR_256GRAY) ||
                                       (scanmode == COLOR_GRAY16)) {
                                          s->opt[OPT_GAMMA_VECTOR].cap   &= ~SANE_CAP_INACTIVE;
                                    } else {
                                          s->opt[OPT_GAMMA_VECTOR_R].cap &= ~SANE_CAP_INACTIVE;
                                          s->opt[OPT_GAMMA_VECTOR_G].cap &= ~SANE_CAP_INACTIVE;
                                          s->opt[OPT_GAMMA_VECTOR_B].cap &= ~SANE_CAP_INACTIVE;
                                    }
                              }

                              if( NULL != info )
                                    *info |= SANE_INFO_RELOAD_OPTIONS | SANE_INFO_RELOAD_PARAMS;
                              break;

                        case OPT_EXT_MODE: {
                              s->val[option].w = optval - s->opt[option].constraint.string_list;

                              /* change the area and mode_list when changing the source
                               */
                              if( s->val[option].w == 0 ) {
                                    dev->scanning.sParam.bSource = SOURCE_Reflection;

                                    dev->dpi_range.min = _DEF_DPI;

                                    dev->x_range.max = SANE_FIX(dev->max_x);
                                    dev->y_range.max = SANE_FIX(dev->max_y);
                                    s->val[OPT_TL_X].w = SANE_FIX(_DEFAULT_TLX);
                                    s->val[OPT_TL_Y].w = SANE_FIX(_DEFAULT_TLY);
                                    s->val[OPT_BR_X].w = SANE_FIX(_DEFAULT_BRX);
                                    s->val[OPT_BR_Y].w = SANE_FIX(_DEFAULT_BRY);

                                    s->opt[OPT_MODE].constraint.string_list = mode_usb_list;
                                    s->val[OPT_MODE].w = 2; /* HEINER COLOR_TRUE24;*/

                              } else {

                                    dev->dpi_range.min = _TPAMinDpi;

                                    if( s->val[option].w == 1 ) {

                                          dev->scanning.sParam.bSource = SOURCE_Transparency;
                                          if( dev->usbDev.Caps.wFlags & DEVCAPSFLAG_LargeTPA ) {
                                                dev->x_range.max = SANE_FIX(_SCALE(_TPALargePageWidth));
                                                dev->y_range.max = SANE_FIX(_SCALE(_TPALargePageHeight));
                                          } else {
                                                dev->x_range.max = SANE_FIX(_SCALE(_TPAPageWidth));
                                                dev->y_range.max = SANE_FIX(_SCALE(_TPAPageHeight));
                                          }
                                          s->val[OPT_TL_X].w = SANE_FIX(_DEFAULT_TP_TLX);
                                          s->val[OPT_TL_Y].w = SANE_FIX(_DEFAULT_TP_TLY);
                                          s->val[OPT_BR_X].w = SANE_FIX(_DEFAULT_TP_BRX);
                                          s->val[OPT_BR_Y].w = SANE_FIX(_DEFAULT_TP_BRY);

                                    } else {
                                          dev->scanning.sParam.bSource = SOURCE_Negative;
                                          if( dev->usbDev.Caps.wFlags & DEVCAPSFLAG_LargeTPA ) {
                                                dev->x_range.max = SANE_FIX(_SCALE(_NegLargePageWidth));
                                                dev->y_range.max = SANE_FIX(_SCALE(_NegLargePageHeight));
                                          } else {
                                                dev->x_range.max = SANE_FIX(_SCALE(_NegPageWidth));
                                                dev->y_range.max = SANE_FIX(_SCALE(_NegPageHeight));
                                          }
                                          s->val[OPT_TL_X].w = SANE_FIX(_DEFAULT_NEG_TLX);
                                          s->val[OPT_TL_Y].w = SANE_FIX(_DEFAULT_NEG_TLY);
                                          s->val[OPT_BR_X].w = SANE_FIX(_DEFAULT_NEG_BRX);
                                          s->val[OPT_BR_Y].w = SANE_FIX(_DEFAULT_NEG_BRY);
                                    }
                                    s->opt[OPT_MODE].constraint.string_list = &mode_usb_list[2];
                                    s->val[OPT_MODE].w = 0;  /* COLOR_24 is the default */
                              }
                              if( s->val[OPT_LAMPSWITCH].w != 0 ) {
                                    usb_LampSwitch( dev, s->val[OPT_LAMPSWITCH].w );
                                    if( s->val[OPT_LAMPSWITCH].w == 0 )
                                          usb_StopLampTimer( dev );
                                    else
                                          usb_StartLampTimer( dev );
                              }

                              s->opt[OPT_CONTRAST].cap &= ~SANE_CAP_INACTIVE;
                              if( NULL != info )
                                    *info |= SANE_INFO_RELOAD_OPTIONS | SANE_INFO_RELOAD_PARAMS;
                              break;
                        }
                        case OPT_GAMMA_VECTOR:
                              DBG( _DBG_INFO, "Setting MASTER gamma.\n" );
                              memcpy( s->val[option].wa, value, s->opt[option].size );
                              checkGammaSettings(s);
                              if( NULL != info )
                                    *info |= SANE_INFO_RELOAD_PARAMS;
                              break;

                        case OPT_GAMMA_VECTOR_R:
                              DBG( _DBG_INFO, "Setting RED gamma.\n" );
                              memcpy( s->val[option].wa, value, s->opt[option].size );
                              checkGammaSettings(s);
                              if( NULL != info )
                                    *info |= SANE_INFO_RELOAD_PARAMS;
                              break;

                        case OPT_GAMMA_VECTOR_G:
                              DBG( _DBG_INFO, "Setting GREEN gamma.\n" );
                              memcpy( s->val[option].wa, value, s->opt[option].size );
                              checkGammaSettings(s);
                              if( NULL != info )
                                    *info |= SANE_INFO_RELOAD_PARAMS;
                              break;

                        case OPT_GAMMA_VECTOR_B:
                              DBG( _DBG_INFO, "Setting BLUE gamma.\n" );
                              memcpy( s->val[option].wa, value, s->opt[option].size );
                              checkGammaSettings(s);
                              if( NULL != info )
                                    *info |= SANE_INFO_RELOAD_PARAMS;
                              break;

                        default:
                              return SANE_STATUS_INVAL;
                  }
                  break;

            default:
                  return SANE_STATUS_INVAL;
      }

      return SANE_STATUS_GOOD;
}

/** according to the option number, return a pointer to a descriptor
 */
const SANE_Option_Descriptor *
02018 sane_get_option_descriptor( SANE_Handle handle, SANE_Int option )
{
      Plustek_Scanner *s = (Plustek_Scanner *)handle;

      if((option < 0) || (option >= NUM_OPTIONS))
            return NULL;

      return &(s->opt[option]);
}

/** return the current parameter settings
 */
SANE_Status
02031 sane_get_parameters( SANE_Handle handle, SANE_Parameters *params )
{
      int              ndpi;
      int              scanmode;
      Plustek_Scanner *s = (Plustek_Scanner *)handle;

      /* if we're calling from within, calc best guess
       * do the same, if sane_get_parameters() is called
       * by a frontend before sane_start() is called
       */
      if((NULL == params) || (s->scanning != SANE_TRUE)) {

            memset( &s->params, 0, sizeof (SANE_Parameters));

            ndpi = s->val[OPT_RESOLUTION].w;

            s->params.pixels_per_line = SANE_UNFIX(s->val[OPT_BR_X].w -
                                  s->val[OPT_TL_X].w) / MM_PER_INCH * ndpi;

            s->params.lines = SANE_UNFIX( s->val[OPT_BR_Y].w -
                                  s->val[OPT_TL_Y].w) / MM_PER_INCH * ndpi;

            /* pixels_per_line seems to be 8 * n.  */
            /* s->params.pixels_per_line = s->params.pixels_per_line & ~7; debug only */

            s->params.last_frame = SANE_TRUE;
            scanmode = getScanMode( s );

            if( scanmode == COLOR_TRUE24 || scanmode == COLOR_TRUE48 ) {
                  s->params.format = SANE_FRAME_RGB;
                  s->params.bytes_per_line = 3 * s->params.pixels_per_line;
            } else {
                  s->params.format = SANE_FRAME_GRAY;
                  if (s->params.depth == 1)
                        s->params.bytes_per_line = (s->params.pixels_per_line + 7) / 8;
                  else
                        s->params.bytes_per_line = s->params.pixels_per_line *
                                                                   s->params.depth / 8;
            }

            /* if sane_get_parameters() was called before sane_start() */
            /* pass new values to the caller                           */
            if ((NULL != params) && (s->scanning != SANE_TRUE))
                  *params = s->params;
      } else {
            *params = s->params;
      }
      return SANE_STATUS_GOOD;
}

/** initiate the scan process
 */
SANE_Status
02084 sane_start( SANE_Handle handle )
{
      Plustek_Scanner *s = (Plustek_Scanner *)handle;
      Plustek_Device  *dev;

      int         result;
      int         ndpi;
      int         left, top;
      int         width, height;
      int         scanmode;
      int         fds[2];
      double      dpi_x, dpi_y;
      CropInfo    crop;
      ScanInfo    sinfo;
      SANE_Status status;
      SANE_Word   tmp;

      DBG( _DBG_SANE_INIT, "sane_start\n" );

      if( s->scanning ) {
            return SANE_STATUS_DEVICE_BUSY;
      }

      status = sane_get_parameters (handle, NULL);
      if (status != SANE_STATUS_GOOD) {
            DBG( _DBG_ERROR, "sane_get_parameters failed\n" );
            return status;
      }

      dev = s->hw;

      /* open the driver and get some information about the scanner
       */
      dev->fd = usbDev_open( dev );
      if( dev->fd < 0 ) {
            DBG( _DBG_ERROR,"sane_start: open failed: %d\n", errno );

            if( errno == EBUSY )
                  return SANE_STATUS_DEVICE_BUSY;

            return SANE_STATUS_IO_ERROR;
      }

      result = usbDev_getCaps( dev );
      if( result < 0 ) {
            DBG( _DBG_ERROR, "usbDev_getCaps() failed(%d)\n", result);
            usbDev_close( dev );
            return SANE_STATUS_IO_ERROR;
      }

      /* All ready to go.  Set image def and see what the scanner
       * says for crop info.
       */
      ndpi = s->val[OPT_RESOLUTION].w;

      /* exchange the values as we can't deal with
       * negative heights and so on...*/
      tmp = s->val[OPT_TL_X].w;
      if( tmp > s->val[OPT_BR_X].w ) {
            DBG( _DBG_INFO, "exchanging BR-X - TL-X\n" );
            s->val[OPT_TL_X].w = s->val[OPT_BR_X].w;
            s->val[OPT_BR_X].w = tmp;
      }

      tmp = s->val[OPT_TL_Y].w;
      if( tmp > s->val[OPT_BR_Y].w ) {
            DBG( _DBG_INFO, "exchanging BR-Y - TL-Y\n" );
            s->val[OPT_TL_Y].w = s->val[OPT_BR_Y].w;
            s->val[OPT_BR_Y].w = tmp;
      }

      /* position and extent are always relative to 300 dpi */
      dpi_x = (double)dev->usbDev.Caps.OpticDpi.x; 
      dpi_y = (double)dev->usbDev.Caps.OpticDpi.x * 2;
      
      left   = (int)(SANE_UNFIX (s->val[OPT_TL_X].w)*dpi_x/
                                                  (MM_PER_INCH*(dpi_x/300.0)));
      top    = (int)(SANE_UNFIX (s->val[OPT_TL_Y].w)*dpi_y/
                                                  (MM_PER_INCH*(dpi_y/300.0)));
      width  = (int)(SANE_UNFIX (s->val[OPT_BR_X].w - s->val[OPT_TL_X].w) *
                                          dpi_x / (MM_PER_INCH *(dpi_x/300.0)));
      height = (int)(SANE_UNFIX (s->val[OPT_BR_Y].w - s->val[OPT_TL_Y].w) *
                                          dpi_y / (MM_PER_INCH *(dpi_y/300.0)));

      /* adjust mode list according to the model we use and the
       * source we have
       */
      scanmode = getScanMode( s );
      DBG( _DBG_INFO, "scanmode = %u\n", scanmode );

      /* clear it out just in case */
      memset (&crop, 0, sizeof(crop));
      crop.ImgDef.xyDpi.x   = ndpi;
      crop.ImgDef.xyDpi.y   = ndpi;
      crop.ImgDef.crArea.x  = left;  /* offset from left edge to area you want to scan */
      crop.ImgDef.crArea.y  = top;   /* offset from top edge to area you want to scan  */
      crop.ImgDef.crArea.cx = width; /* always relative to 300 dpi */
      crop.ImgDef.crArea.cy = height;
      crop.ImgDef.wDataType = scanmode;
      crop.ImgDef.dwFlag    = SCANDEF_QualityScan;

      switch( s->val[OPT_EXT_MODE].w ) {
            case 1: crop.ImgDef.dwFlag |= SCANDEF_Transparency; break;
            case 2: crop.ImgDef.dwFlag |= SCANDEF_Negative;     break;
            default: break;
      }

      result = usbDev_getCropInfo( dev, &crop );
      if( result < 0 ) {
            DBG( _DBG_ERROR, "usbDev_getCropInfo() failed(%d)\n", result );
            usbDev_close( dev );
            return SANE_STATUS_IO_ERROR;
      }

      /* DataInf.dwAppPixelsPerLine = crop.dwPixelsPerLine;  */
      s->params.pixels_per_line = crop.dwPixelsPerLine;
      s->params.bytes_per_line  = crop.dwBytesPerLine;
      s->params.lines           = crop.dwLinesPerArea;

      /* build a SCANINFO block and get ready to scan it */
      crop.ImgDef.dwFlag |= SCANDEF_QualityScan;

      /* remove that for preview scans */
      if( s->val[OPT_PREVIEW].w )
            crop.ImgDef.dwFlag &= (~SCANDEF_QualityScan);

      /* set adjustments for brightness and contrast */
      sinfo.siBrightness = s->val[OPT_BRIGHTNESS].w;
      sinfo.siContrast   = s->val[OPT_CONTRAST].w;

      memcpy( &sinfo.ImgDef, &crop.ImgDef, sizeof(ImgDef));
      
      DBG( _DBG_SANE_INIT, "brightness %i, contrast %i\n",
                            sinfo.siBrightness, sinfo.siContrast );

      result = usbDev_setScanEnv( dev, &sinfo );
      if( result < 0 ) {
            DBG( _DBG_ERROR, "usbDev_setScanEnv() failed(%d)\n", result );
            usbDev_close( dev );
            return SANE_STATUS_IO_ERROR;
      }

      /* download gamma correction tables... */
      if( scanmode <= COLOR_GRAY16 ) {
            usbDev_setMap( dev, s->gamma_table[0], s->gamma_length, _MAP_MASTER);
      } else {
            usbDev_setMap( dev, s->gamma_table[1], s->gamma_length, _MAP_RED   );
            usbDev_setMap( dev, s->gamma_table[2], s->gamma_length, _MAP_GREEN );
            usbDev_setMap( dev, s->gamma_table[3], s->gamma_length, _MAP_BLUE  );
      }

      tsecs = 0; /* reset timer */

      result = usbDev_startScan( dev );
      if( result < 0 ) {
            DBG( _DBG_ERROR, "usbDev_startScan() failed(%d)\n", result );
            usbDev_close( dev );
            return SANE_STATUS_IO_ERROR;
      }

      DBG( _DBG_SANE_INIT, "dwflag = 0x%lx dwBytesLine = %ld \n",
                            dev->scanning.dwFlag, dev->scanning.dwBytesLine );
      DBG( _DBG_SANE_INIT, "Lines          = %d\n", s->params.lines);
      DBG( _DBG_SANE_INIT, "Bytes per Line = %d\n", s->params.bytes_per_line );
      DBG( _DBG_SANE_INIT, "Bitdepth       = %d\n", s->params.depth );
      s->buf = realloc( s->buf, (s->params.lines) * s->params.bytes_per_line );
      if( NULL == s->buf ) {
            DBG( _DBG_ERROR, "realloc failed\n" );
            usbDev_close( dev );
            return SANE_STATUS_NO_MEM;
      }

      s->scanning = SANE_TRUE;

      tsecs = (unsigned long)time(NULL);
      DBG( _DBG_INFO, "TIME START\n" );

      /*
       * everything prepared, so start the child process and a pipe to communicate
       * pipe --> fds[0]=read-fd, fds[1]=write-fd
       */
      if( pipe(fds) < 0 ) {
            DBG( _DBG_ERROR, "ERROR: could not create pipe\n" );
          s->scanning = SANE_FALSE;
            usbDev_close( dev );
            return SANE_STATUS_IO_ERROR;
      }

      /* create reader routine as new process */
      s->bytes_read = 0;
      s->r_pipe     = fds[0];
      s->w_pipe     = fds[1];
      s->reader_pid = sanei_thread_begin( reader_process, s );

      cancelRead = SANE_FALSE;
      
      if( s->reader_pid < 0 ) {
            DBG( _DBG_ERROR, "ERROR: could not start reader task\n" );
          s->scanning = SANE_FALSE;
            usbDev_close( dev );
            return SANE_STATUS_IO_ERROR;
      }

      signal( SIGCHLD, sig_chldhandler );

      if( sanei_thread_is_forked()) {
            close( s->w_pipe );
            s->w_pipe = -1;
      }

      DBG( _DBG_SANE_INIT, "sane_start done\n" );
      return SANE_STATUS_GOOD;
}

/** function to read the data from our child process
 */
SANE_Status
02301 sane_read( SANE_Handle handle, SANE_Byte *data,
           SANE_Int max_length, SANE_Int *length )
{
      Plustek_Scanner *s = (Plustek_Scanner*)handle;
      ssize_t          nread;

      *length = 0;

      /* here we read all data from the driver... */
      nread = read( s->r_pipe, data, max_length );
      DBG( _DBG_READ, "sane_read - read %ld bytes\n", (long)nread );
      if (!(s->scanning)) {
            return do_cancel( s, SANE_TRUE );
      }

      if( nread < 0 ) {

            if( EAGAIN == errno ) {

                  /* if we already had red the picture, so it's okay and stop */
                  if( s->bytes_read ==
                        (unsigned long)(s->params.lines * s->params.bytes_per_line)) {
                        sanei_thread_waitpid( s->reader_pid, 0 );
                        s->reader_pid = -1;
                        drvclose( s->hw );
                        return close_pipe(s);
                  }

                  /* else force the frontend to try again*/
                  return SANE_STATUS_GOOD;

            } else {
                  DBG( _DBG_ERROR, "ERROR: errno=%d\n", errno );
                  do_cancel( s, SANE_TRUE );
                  return SANE_STATUS_IO_ERROR;
            }
      }

      *length        = nread;
      s->bytes_read += nread;

      /* nothing red means that we're finished OR we had a problem... */
      if( 0 == nread ) {

            drvclose( s->hw );
            s->exit_code = sanei_thread_get_status( s->reader_pid );

            if( SANE_STATUS_GOOD != s->exit_code ) {
                  close_pipe(s);
                  return s->exit_code;
            }
            s->reader_pid = -1;
            return close_pipe(s);
      }
      return SANE_STATUS_GOOD;
}

/** cancel the scanning process
 */
void
02361 sane_cancel( SANE_Handle handle )
{
      Plustek_Scanner *s = (Plustek_Scanner *)handle;

      DBG( _DBG_SANE_INIT, "sane_cancel\n" );

      if( s->scanning )
            do_cancel( s, SANE_FALSE );
}

/** set the pipe to blocking/non blocking mode
 */
SANE_Status
02374 sane_set_io_mode( SANE_Handle handle, SANE_Bool non_blocking )
{
      Plustek_Scanner *s = (Plustek_Scanner *)handle;

      DBG( _DBG_SANE_INIT, "sane_set_io_mode: non_blocking=%d\n",non_blocking );

      if ( !s->scanning ) {
            DBG( _DBG_ERROR, "ERROR: not scanning !\n" );
            return SANE_STATUS_INVAL;
      }

      if( -1 == s->r_pipe ) {
            DBG( _DBG_ERROR, "ERROR: not supported !\n" );
            return SANE_STATUS_UNSUPPORTED;
      }
      
      if( fcntl (s->r_pipe, F_SETFL, non_blocking ? O_NONBLOCK : 0) < 0) {
            DBG( _DBG_ERROR, "ERROR: canīt set to non-blocking mode !\n" );
            return SANE_STATUS_IO_ERROR;
      }

      DBG( _DBG_SANE_INIT, "sane_set_io_mode done\n" );
      return SANE_STATUS_GOOD;
}

/** return the descriptor if available
 */
SANE_Status
02402 sane_get_select_fd( SANE_Handle handle, SANE_Int * fd )
{
      Plustek_Scanner *s = (Plustek_Scanner *)handle;

      DBG( _DBG_SANE_INIT, "sane_get_select_fd\n" );

      if( !s->scanning ) {
            DBG( _DBG_ERROR, "ERROR: not scanning !\n" );
            return SANE_STATUS_INVAL;
      }

      *fd = s->r_pipe;

      DBG( _DBG_SANE_INIT, "sane_get_select_fd done\n" );
      return SANE_STATUS_GOOD;
}

/* END PLUSTEK.C ............................................................*/

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