Initial import of sane-backends version 1.0.24-1.2

1 files changed, 2180 insertions, 0 deletions

diff --git a/backend/plustek_pp.c b/backend/plustek_pp.c
new file mode 100644
index 0000000..bf4c0d0
--- /dev/null
+++ b/backend/plustek_pp.c
@@ -0,0 +1,2180 @@
+/** @file plustek_pp.c
+ *  @brief SANE backend for Plustek parallelport 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) 2000-2013 Gerhard Jaeger <gerhard@gjaeger.de><br>
+ *
+ * History:
+ * - 0.01 - initial version, imported from the kernel-module 0.42-11
+ * - 0.43 - bumped up version to reflect the former module code version
+ * - 0.44 - bumped up version to reflect the recent changes
+ *        - minor cleanup
+ *.
+ * <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-PARPORT.txt
+ */
+  
+#ifdef _AIX
+# include "../include/lalloca.h"  /* MUST come first for AIX! */
+#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>
+#include <stdint.h>
+
+#include <sys/time.h>
+#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 "0.44-1"
+#define BACKEND_NAME	plustek_pp
+#include "../include/sane/sanei_backend.h"
+#include "../include/sane/sanei_config.h"
+#include "../include/sane/sanei_thread.h"
+#include "../include/sane/sanei_pp.h"
+
+#define _BACKEND_ENABLED
+#define _USER_MODE
+
+#include "plustek-pp.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     13
+#define _DBG_DUMP      20
+#define _DBG_READ      25
+
+/*****************************************************************************/
+
+/*
+ * see plustek-share.h
+ */
+MODELSTR;
+
+#ifdef _BACKEND_ENABLED
+#ifndef NDEBUG
+# define DEBUG
+#endif
+
+/* I know this is in general no good idea, but it works */
+# include "plustek-pp_io.c"
+# include "plustek-pp_dac.c"
+# include "plustek-pp_detect.c"
+# include "plustek-pp_genericio.c"
+# include "plustek-pp_image.c"
+# include "plustek-pp_map.c"
+# include "plustek-pp_misc.c"
+# include "plustek-pp_models.c"
+# include "plustek-pp_motor.c"
+# include "plustek-pp_p12.c"
+# include "plustek-pp_p12ccd.c"
+# include "plustek-pp_p48xx.c"
+# include "plustek-pp_p9636.c"
+# include "plustek-pp_procfs.c"
+# include "plustek-pp_scale.c"
+# include "plustek-pp_tpa.c"
+
+#define _DEFAULT_DEVICE "0x378"
+#else
+#define _DEFAULT_DEVICE "/dev/pt_drv"
+#endif
+
+#ifdef _BACKEND_ENABLED
+# include "plustek-pp_ptdrv.c"
+#endif
+
+#include "plustek-pp_wrapper.c"
+
+
+/************************** 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 ModeParam mode_params[] =
+{
+  {0, 1, COLOR_BW},
+  {0, 1, COLOR_HALFTONE},
+  {0, 8, COLOR_256GRAY},
+  {1, 8, COLOR_TRUE24},
+  {1, 16, COLOR_TRUE32},
+  {1, 16, COLOR_TRUE36}
+};
+
+static ModeParam mode_9800x_params[] =
+{
+  {0, 1,  COLOR_BW},
+  {0, 1,  COLOR_HALFTONE},
+  {0, 8,  COLOR_256GRAY},
+  {1, 8,  COLOR_TRUE24},
+  {1, 16, COLOR_TRUE48}
+};
+
+static const SANE_String_Const mode_list[] =
+{
+	SANE_VALUE_SCAN_MODE_LINEART,
+	SANE_VALUE_SCAN_MODE_HALFTONE,
+	SANE_VALUE_SCAN_MODE_GRAY,
+	SANE_VALUE_SCAN_MODE_COLOR,
+	NULL
+};
+
+static const SANE_String_Const mode_9800x_list[] =
+{
+	SANE_VALUE_SCAN_MODE_LINEART,
+	SANE_VALUE_SCAN_MODE_HALFTONE,
+	SANE_VALUE_SCAN_MODE_GRAY,
+	SANE_VALUE_SCAN_MODE_COLOR,
+	SANE_I18N("Color36"),
+	NULL
+};
+
+static const SANE_String_Const ext_mode_list[] =
+{
+	SANE_I18N("Normal"),
+	SANE_I18N("Transparency"),
+	SANE_I18N("Negative"),
+	NULL
+};
+
+static const SANE_String_Const halftone_list[] =
+{
+	SANE_I18N("Dithermap 1"),
+	SANE_I18N("Dithermap 2"),
+	SANE_I18N("Randomize"),
+	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 */
+};
+
+/*
+ * lens info
+ */
+static LensInfo lens = {{0,0,0,0,},{0,0,0,0,},{0,0,0,0,},{0,0,0,0,},0,0};
+
+/* 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
+ */
+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,"direct I/O    : %s\n",   _YN(cnf->adj.direct_io    ));
+	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,"model override: %d\n",   cnf->adj.mov               );
+	DBG( _DBG_SANE_INIT,"---------------------\n" );
+}
+
+/** open the device specific driver and reset the internal timing stuff
+ * @param  dev - pointer to the device specific structure
+ * @return the function returns the result of the open call, on success
+ *         of course the handle
+ */
+static int drvopen(	Plustek_Device *dev )
+{
+	int handle;
+
+    DBG( _DBG_INFO, "drvopen()\n" );
+
+	handle = dev->open((const char*)dev->name, (void *)dev );
+
+	tsecs = 0;
+
+	return handle;
+}
+
+/** 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 drvclose( Plustek_Device *dev )
+{
+	short int_cnt;
+
+	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 and close the driver
+		 */
+		int_cnt = 0;
+		dev->stopScan( dev, &int_cnt );
+		dev->close( dev );
+	}
+	dev->fd = -1;
+
+	return SANE_STATUS_GOOD;
+}
+
+/** according to the mode and source we return the corresponding mode list
+ */
+static pModeParam getModeList( Plustek_Scanner *scanner )
+{
+	pModeParam mp;
+
+	if((_ASIC_IS_98003 == scanner->hw->caps.AsicID) ||
+   	   (_ASIC_IS_98001 == scanner->hw->caps.AsicID)) {
+		mp = mode_9800x_params;	
+	} else {
+		mp = mode_params;	
+	}	
+
+	/*
+	 * the transparency/negative mode supports only GRAY/COLOR/COLOR32/COLOR48
+	 */
+	if( 0 != scanner->val[OPT_EXT_MODE].w ) {
+		mp = &mp[_TPAModeSupportMin];
+	}		
+
+	return mp;
+}
+
+/**
+ */
+static SANE_Status close_pipe( Plustek_Scanner *scanner )
+{
+	if( scanner->r_pipe >= 0 ) {
+
+		DBG( _DBG_PROC, "close r_pipe\n" );
+		close( scanner->r_pipe );
+		scanner->r_pipe = -1;
+	}
+	if( scanner->w_pipe >= 0 ) {
+
+		DBG( _DBG_PROC, "close w_pipe\n" );
+		close( scanner->w_pipe );
+		scanner->w_pipe = -1;
+	}
+
+	return SANE_STATUS_EOF;
+}
+
+/**
+ */
+static void sig_chldhandler( int signo )
+{
+	DBG( _DBG_PROC, "Child is down (signal=%d)\n", signo );
+}
+
+/** signal handler to kill the child process
+ */
+static RETSIGTYPE reader_process_sigterm_handler( int signo )
+{
+	DBG( _DBG_PROC, "reader_process: terminated by signal %d\n", signo );
+	_exit( SANE_STATUS_GOOD );
+}
+
+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
+ */
+static int reader_process( void *args )
+{
+	int              line;
+	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 );
+
+	/* install the signal handler */
+    sigemptyset(&(act.sa_mask));
+    act.sa_flags = 0;
+
+	act.sa_handler = reader_process_sigterm_handler;
+	sigaction( SIGTERM, &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... */
+	if( scanner->hw->readImage ) {
+
+		status = (unsigned long)scanner->hw->readImage( scanner->hw,
+                                                    scanner->buf, data_length);
+	} else {
+
+		unsigned char *buf = scanner->buf;
+
+
+		status = scanner->hw->prepare( scanner->hw, buf );
+    	
+        if( 0 == status ) {
+
+			for( line = 0; line < scanner->params.lines; line++ ) {
+
+				status = scanner->hw->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 */
+	if((int)status < 0 ) {
+		DBG( _DBG_ERROR, "read failed, status = %i, errno %i\n",
+                                                          (int)status, errno );
+		if( -9009 == (int)status )
+			return SANE_STATUS_CANCELLED;
+		
+		if( errno == EBUSY )
+			return SANE_STATUS_DEVICE_BUSY;
+
+		return SANE_STATUS_IO_ERROR;
+    }
+
+	/* send to parent */
+	if( scanner->hw->readImage ) {
+		DBG( _DBG_PROC, "sending %lu bytes to parent\n", status );
+	    write( scanner->w_pipe, scanner->buf, status );
+	}
+
+	DBG( _DBG_PROC, "reader_process: finished reading data\n" );
+	return SANE_STATUS_GOOD;
+}
+
+/** stop the current scan process
+ */
+static SANE_Status do_cancel( Plustek_Scanner *scanner, SANE_Bool closepipe  )
+{
+	struct SIGACTION act;
+	SANE_Pid         res;
+	short            int_cnt;
+
+	DBG( _DBG_PROC,"do_cancel\n" );
+
+	scanner->scanning = SANE_FALSE;
+
+	if( scanner->reader_pid != -1 ) {
+
+		DBG( _DBG_PROC, ">>>>>>>> killing reader_process <<<<<<<<\n" );
+
+		/* tell the driver to stop scanning */
+		if( -1 != scanner->hw->fd ) {
+			int_cnt = 1;
+			scanner->hw->stopScan( scanner->hw, &int_cnt );
+		}	
+		
+	    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_kill( scanner->reader_pid );
+
+		/* 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 = -1;
+		DBG( _DBG_PROC,"reader_process killed\n");
+	}
+
+	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;
+}
+
+/** because of some internal problems (inside the parport driver), we have to
+ * limit the max resolution to optical resolution. This is done by this
+ * function
+ * @param  dev - pointer to the device specific structure
+ * @return The function always returns SANE_STATUS_GOOD
+ */
+static void limitResolution( Plustek_Device *dev )
+{
+	dev->dpi_range.min = _DEF_DPI;
+ 	if( dev->dpi_range.min < _DEF_DPI )
+		dev->dpi_range.min = _DEF_DPI;
+
+	/*
+	 * CHANGE: limit resolution to max. physical available one
+	 *		   Note: the resolution for the Asic 96001/3 models is limited to
+	 *               the X-Resolution
+	 */
+	if((_ASIC_IS_96003 == dev->caps.AsicID) ||
+       (_ASIC_IS_96001 == dev->caps.AsicID)) {
+		dev->dpi_range.max = lens.rDpiX.wPhyMax;
+	} else {
+		dev->dpi_range.max = lens.rDpiY.wPhyMax;
+	}
+	
+	dev->dpi_range.quant = 0;
+	dev->x_range.min 	 = 0;
+	dev->x_range.max 	 = SANE_FIX(dev->max_x);
+	dev->x_range.quant 	 = 0;
+	dev->y_range.min 	 = 0;
+	dev->y_range.max 	 = SANE_FIX(dev->max_y);
+	dev->y_range.quant 	 = 0;
+}
+
+/** 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
+ */
+static SANE_Status initGammaSettings( Plustek_Scanner *s )
+{
+	int    i, j, val;
+	double gamma;
+
+	/*
+     * this setting is common to the ASIC98001/3 and
+     * LM9831/2/3 based devices
+     * older parallelport devices use 256 entries
+     */
+	s->gamma_length      = 4096;
+  	s->gamma_range.min   = 0;
+  	s->gamma_range.max   = 255;
+  	s->gamma_range.quant = 0;
+
+	if((_ASIC_IS_96003 == s->hw->caps.AsicID) ||
+       (_ASIC_IS_96001 == s->hw->caps.AsicID)) {
+
+		s->gamma_length = 256;
+	}
+  	
+  	DBG( _DBG_INFO, "Presetting Gamma tables (len=%u)\n", s->gamma_length );
+  	DBG( _DBG_INFO, "----------------------------------\n" );
+  	
+  	/*
+  	 * 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;
+		}			
+  	
+		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;					
+		}			
+	}			
+	
+	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
+ */
+static void checkGammaSettings( Plustek_Scanner *s )
+{
+	int i, j;
+
+	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
+ */
+static SANE_Status init_options( Plustek_Scanner *s )
+{
+	int i;
+
+	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;
+
+	if((_ASIC_IS_98001  == s->hw->caps.AsicID) ||
+	   (_ASIC_IS_98003  == s->hw->caps.AsicID)) {
+		s->opt[OPT_MODE].constraint.string_list = mode_9800x_list;
+	} else {
+		s->opt[OPT_MODE].constraint.string_list = mode_list;
+	}
+	s->val[OPT_MODE].w = 3; /* Color */
+
+	/* 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 */
+	
+	/* halftone */
+	s->opt[OPT_HALFTONE].name  = SANE_NAME_HALFTONE_PATTERN;
+	s->opt[OPT_HALFTONE].title = SANE_TITLE_HALFTONE;
+	s->opt[OPT_HALFTONE].desc  = SANE_DESC_HALFTONE_PATTERN;
+	s->opt[OPT_HALFTONE].type  = SANE_TYPE_STRING;
+	s->opt[OPT_HALFTONE].size  = 32;
+	s->opt[OPT_HALFTONE].constraint_type = SANE_CONSTRAINT_STRING_LIST;
+	s->opt[OPT_HALFTONE].constraint.string_list = halftone_list;
+	s->val[OPT_HALFTONE].w = 0;	/* Standard dithermap */
+	s->opt[OPT_HALFTONE].cap |= SANE_CAP_INACTIVE;
+
+	/* 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;
+	}
+
+  	/* disable custom gamma, if not supported by the driver... */
+	if( 0 == (s->hw->caps.dwFlag & SFLAG_CUSTOM_GAMMA)) {
+	  	s->opt[OPT_CUSTOM_GAMMA].cap |= SANE_CAP_INACTIVE;
+	}  		
+
+	return SANE_STATUS_GOOD;
+}
+
+#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
+ */
+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
+ */
+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
+ */
+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 */
+
+	memcpy( &dev->adj, &cnf->adj, sizeof(AdjDef));
+
+	show_cnf( cnf );
+
+	dev->sane.type   = SANE_I18N ("flatbed scanner");
+	dev->open        = ppDev_open;
+	dev->close       = ppDev_close;
+	dev->getCaps     = ppDev_getCaps;
+	dev->getLensInfo = ppDev_getLensInfo;
+	dev->getCropInfo = ppDev_getCropInfo;
+	dev->putImgInfo  = ppDev_putImgInfo;
+	dev->setScanEnv  = ppDev_setScanEnv;
+	dev->startScan   = ppDev_startScan;
+	dev->stopScan    = ppDev_stopScan;
+	dev->setMap      = ppDev_setMap;
+	dev->readImage   = ppDev_readImage;
+	dev->shutdown    = NULL;
+	dev->readLine    = NULL;
+	dev->prepare     = NULL;
+
+	/*
+	 * go ahead and open the scanner device
+	 */
+	handle = drvopen( 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 = dev->getCaps( dev );
+	if( result < 0 ) {
+		DBG( _DBG_ERROR, "dev->getCaps() failed(%d)\n", result);
+		dev->close(dev);
+		return SANE_STATUS_IO_ERROR;
+    }
+
+	result = dev->getLensInfo( dev, &lens );
+	if( result < 0 ) {
+		DBG( _DBG_ERROR, "dev->getLensInfo() failed(%d)\n", result );
+		dev->close(dev);
+		return SANE_STATUS_IO_ERROR;
+	}
+
+	/* did we fail on connection? */
+	if( _NO_BASE == dev->caps.wIOBase ) {
+		DBG( _DBG_ERROR, "failed to find Plustek scanner\n" );
+		dev->close(dev);
+		return SANE_STATUS_INVAL;
+	}
+
+	/* save the info we got from the driver */
+	DBG( _DBG_INFO, "Scanner information:\n" );
+	if( dev->caps.Model < MODEL_UNKNOWN ) {
+		dev->sane.model = ModelStr[dev->caps.Model];
+	} else {
+		dev->sane.model = ModelStr[0];
+	}
+	
+	DBG( _DBG_INFO, "Vendor : %s\n",      dev->sane.vendor  );
+	DBG( _DBG_INFO, "Model  : %s\n",      dev->sane.model   );
+	DBG( _DBG_INFO, "Asic   : 0x%02x\n",  dev->caps.AsicID  );
+	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;
+
+	dev->res_list = (SANE_Int *)calloc(((lens.rDpiX.wMax -_DEF_DPI)/25 + 1),
+			     sizeof (SANE_Int));  /* one more to avoid a buffer overflow */
+
+	if (NULL == dev->res_list) {
+		DBG( _DBG_ERROR, "alloc fail, resolution problem\n" );
+		dev->close(dev);
+		return SANE_STATUS_INVAL;
+	}
+
+	/* build up the resolution table */
+	dev->res_list_size = 0;
+	for( cntr = _DEF_DPI; cntr <= lens.rDpiX.wMax; cntr += 25 ) {
+		dev->res_list_size++;
+		dev->res_list[dev->res_list_size - 1] = (SANE_Int)cntr;
+	}
+
+	limitResolution( dev );
+
+	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
+ */
+static void init_config_struct( pCnfDef cnf, SANE_Bool direct_io )
+{
+    memset( cnf, 0, sizeof(CnfDef));
+
+	cnf->adj.direct_io    = direct_io;
+
+	cnf->adj.warmup       = -1;
+	cnf->adj.lampOff      = -1;
+	cnf->adj.lampOffOnEnd = -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 sane_init( SANE_Int *version_code, SANE_Auth_Callback authorize )
+{
+	char     str[PATH_MAX] = _DEFAULT_DEVICE;
+    CnfDef   config;
+	size_t   len;
+	FILE    *fp;
+	SANE_Status res;
+
+	DBG_INIT();
+	sanei_thread_init();
+	
+	res = sanei_pp_init();
+	if( SANE_STATUS_GOOD != res ) {
+		DBG( _DBG_ERROR, "Could not initialize Parport library!\n" );
+		return res;
+	}
+
+#if defined PACKAGE && defined VERSION
+	DBG( _DBG_SANE_INIT, "PlustekPP backend V"BACKEND_VERSION", part of "
+												 PACKAGE " " VERSION "\n");
+#else
+	DBG( _DBG_INFO, "PlustekPP backend V"BACKEND_VERSION"\n" );
+#endif
+
+	/* do some presettings... */
+	auth         = authorize;
+	first_dev    = NULL;
+	first_handle = NULL;
+	num_devices  = 0;
+
+	/* initialize the configuration structure */
+#ifdef _BACKEND_ENABLED
+	init_config_struct( &config, SANE_TRUE );
+#else
+	init_config_struct( &config, SANE_FALSE );
+#endif
+
+	if( version_code != NULL )
+		*version_code = SANE_VERSION_CODE(SANE_CURRENT_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;
+		
+			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);
+
+			ival = 0;
+			decodeVal( str, "mov", _INT, &config.adj.mov, &ival );
+			continue;
+
+		/* check for sections: */
+		} else if( 0 == strncmp( str, "[direct]", 8)) {
+											
+		    /* new section, try and attach previous device */
+		    if( config.devName[0] != '\0' )
+				attach( config.devName, &config, 0 );
+											
+			/* re-initialize the configuration structure */
+			init_config_struct( &config, SANE_TRUE );
+			continue;				
+
+		} else if( 0 == strncmp( str, "[kernel]", 8 )) {
+
+		    /* new section, try and attach previous device */
+		    if( config.devName[0] != '\0' )
+				attach( config.devName, &config, 0 );
+
+			/* re-initialize the configuration structure */
+			init_config_struct( &config, SANE_FALSE );
+			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 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... */
+		if( dev->shutdown )
+			dev->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->res_list )
+			free( dev->res_list );
+		free( dev );
+
+		dev = next;
+	}
+
+	if( devlist )
+    	free( devlist );
+
+    /* call driver specific shutdown function... */
+	PtDrvShutdown();
+
+    devlist      = NULL;
+	auth         = NULL;
+	first_dev    = NULL;
+	first_handle = NULL;
+}
+
+/** return a list of all devices
+ */
+SANE_Status 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 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));
+			
+			/* check if a valid parport-device is meant... */
+			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 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 *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 sane_control_option( SANE_Handle handle, SANE_Int option,
+							     SANE_Action action, void *value,
+							     SANE_Int * info)
+{
+	Plustek_Scanner         *s = (Plustek_Scanner *)handle;
+	SANE_Status              status;
+	const SANE_String_Const *optval;
+	pModeParam               mp;
+	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_TL_X:
+			case OPT_TL_Y:
+			case OPT_BR_X:
+			case OPT_BR_Y:
+			case OPT_CUSTOM_GAMMA:
+			  *(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:
+			case OPT_HALFTONE:
+				strcpy ((char *) value,
+					  s->opt[option].constraint.string_list[s->val[option].w]);
+				break;
+	
+	  		/* word array options: */
+	  		case OPT_GAMMA_VECTOR:
+			case OPT_GAMMA_VECTOR_R:
+			case OPT_GAMMA_VECTOR_G:
+			case OPT_GAMMA_VECTOR_B:
+				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 = s->hw->res_list[s->hw->res_list_size - 1];
+			        int v     = *(SANE_Word *)value;
+    	    		int best  = v;
+
+	    		    for( n = 0; n < s->hw->res_list_size; n++ ) {
+		    			int d = abs(v - s->hw->res_list[n]);
+
+					    if( d < min_d ) {
+				    	    min_d = d;
+				    	    best  = s->hw->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_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_CUSTOM_GAMMA:
+    				s->val[option].w = *(SANE_Word *)value;
+	    			if( NULL != info )
+    					*info |= SANE_INFO_RELOAD_PARAMS | SANE_INFO_RELOAD_OPTIONS;
+
+					mp       = getModeList( s );
+					scanmode = mp[s->val[OPT_MODE].w].scanmode;
+
+				    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 ) {
+    				
+    					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 {
+	
+						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_CONTRAST:
+			    case OPT_BRIGHTNESS:
+        			s->val[option].w =
+							((*(SANE_Word *)value) >> SANE_FIXED_SCALE_SHIFT);
+	    			break;
+
+		    	case OPT_MODE: {
+
+                    int idx = (optval - mode_list);
+
+                	if((_ASIC_IS_98001 == s->hw->caps.AsicID) ||
+                                     (_ASIC_IS_98003  == s->hw->caps.AsicID)) {
+                        idx = optval - mode_9800x_list;
+                    }
+
+               		mp = getModeList( s );
+               		
+	    			if( mp[idx].scanmode != COLOR_HALFTONE ){
+		    			s->opt[OPT_HALFTONE].cap     |= SANE_CAP_INACTIVE;
+			    		s->opt[OPT_CONTRAST].cap     &= ~SANE_CAP_INACTIVE;
+			    		s->opt[OPT_CUSTOM_GAMMA].cap &= ~SANE_CAP_INACTIVE;
+				    } else {
+					    s->opt[OPT_HALFTONE].cap     &= ~SANE_CAP_INACTIVE;
+    					s->opt[OPT_CONTRAST].cap     |= SANE_CAP_INACTIVE;
+			    		s->opt[OPT_CUSTOM_GAMMA].cap |= SANE_CAP_INACTIVE;
+	    			}
+
+	    			if( mp[idx].scanmode == COLOR_BW ) {
+			    		s->opt[OPT_CONTRAST].cap     |= SANE_CAP_INACTIVE;
+			    		s->opt[OPT_CUSTOM_GAMMA].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((mp[idx].scanmode == COLOR_256GRAY) ||
+						   (mp[idx].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;
+                }
+
+           		/* fall through to OPT_HALFTONE */
+	    		case OPT_HALFTONE:
+			    	s->val[option].w = optval - s->opt[option].constraint.string_list;
+				    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 ) {
+
+	    				s->hw->dpi_range.min = _DEF_DPI;
+
+		    			s->hw->x_range.max = SANE_FIX(s->hw->max_x);
+			    		s->hw->y_range.max = SANE_FIX(s->hw->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->val[OPT_MODE].w = 3;		/* COLOR_TRUE24 */
+
+                    	if((_ASIC_IS_98001  == s->hw->caps.AsicID) ||
+                           (_ASIC_IS_98003  == s->hw->caps.AsicID)) {
+				    		s->opt[OPT_MODE].constraint.string_list = mode_9800x_list;
+						} else {
+						    s->opt[OPT_MODE].constraint.string_list = mode_list;
+    					}
+
+				    } else {
+
+					    s->hw->dpi_range.min = _TPAMinDpi;
+
+    					if( s->val[option].w == 1 ) {
+        					s->hw->x_range.max = SANE_FIX(_TP_X);
+		    				s->hw->y_range.max = SANE_FIX(_TP_Y);
+			    			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 {
+        					s->hw->x_range.max = SANE_FIX(_NEG_X);
+			    			s->hw->y_range.max = SANE_FIX(_NEG_Y);
+		    				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);
+    					}
+
+	    				if( s->hw->caps.dwFlag & SFLAG_TPA ) {
+	    				
+		    				s->opt[OPT_MODE].constraint.string_list =
+											&mode_9800x_list[_TPAModeSupportMin];
+        	    		} else {
+				    		s->opt[OPT_MODE].constraint.string_list =
+												&mode_list[_TPAModeSupportMin];
+					    }
+ 						s->val[OPT_MODE].w = 0;		/* COLOR_24 is the default */
+        			}
+
+		    		s->opt[OPT_HALFTONE].cap |= SANE_CAP_INACTIVE;
+				    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:
+				case OPT_GAMMA_VECTOR_R:
+				case OPT_GAMMA_VECTOR_G:
+				case OPT_GAMMA_VECTOR_B:
+					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 *
+   			 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 sane_get_parameters( SANE_Handle handle, SANE_Parameters *params )
+{
+	int    			 ndpi;
+	pModeParam  	 mp;
+	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)) {
+
+		mp = getModeList( s );
+
+		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;
+    	s->params.depth      = mp[s->val[OPT_MODE].w].depth;
+
+		if( mp[s->val[OPT_MODE].w].color ) {
+			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 sane_start( SANE_Handle handle )
+{
+	Plustek_Scanner *s = (Plustek_Scanner *) handle;
+	pModeParam		 mp;
+
+	int			result;
+	int 		ndpi;
+	int 		left, top;
+	int 		width, height;
+	int			scanmode;
+	int         fds[2];
+	StartScan	start;
+	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;
+	}
+
+	/*
+	 * open the driver and get some information about the scanner
+	 */
+	s->hw->fd = drvopen( s->hw );
+	if( s->hw->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 = s->hw->getCaps( s->hw );
+	if( result < 0 ) {
+		DBG( _DBG_ERROR, "dev->getCaps() failed(%d)\n", result);
+		s->hw->close( s->hw );
+		return SANE_STATUS_IO_ERROR;
+    }
+	
+	result = s->hw->getLensInfo( s->hw, &lens );
+	if( result < 0 ) {
+		DBG( _DBG_ERROR, "dev->getLensInfo() failed(%d)\n", result );
+		s->hw->close( s->hw );
+		return SANE_STATUS_IO_ERROR;
+    }
+
+	/* did we fail on connection? */
+	if ( s->hw->caps.wIOBase == _NO_BASE ) {
+		DBG( _DBG_ERROR, "failed to find Plustek scanner\n" );
+		s->hw->close( s->hw );
+		return SANE_STATUS_INVAL;
+	}
+
+	/* 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 */
+	left   = (int)(SANE_UNFIX (s->val[OPT_TL_X].w)*(double)lens.rDpiX.wPhyMax/
+							(MM_PER_INCH*((double)lens.rDpiX.wPhyMax/300.0)));
+	top    = (int)(SANE_UNFIX (s->val[OPT_TL_Y].w)*(double)lens.rDpiY.wPhyMax/
+							(MM_PER_INCH*((double)lens.rDpiY.wPhyMax/300.0)));
+	width  = (int)(SANE_UNFIX (s->val[OPT_BR_X].w - s->val[OPT_TL_X].w) *
+					(double)lens.rDpiX.wPhyMax /
+							(MM_PER_INCH *((double)lens.rDpiX.wPhyMax/300.0)));
+	height = (int)(SANE_UNFIX (s->val[OPT_BR_Y].w - s->val[OPT_TL_Y].w) *
+					(double)lens.rDpiY.wPhyMax /
+							(MM_PER_INCH *((double)lens.rDpiY.wPhyMax/300.0)));
+
+	/*
+	 * adjust mode list according to the model we use and the
+	 * source we have
+	 */
+	mp = getModeList( s );
+
+	scanmode = mp[s->val[OPT_MODE].w].scanmode;
+	DBG( _DBG_INFO, "scanmode = %u\n", scanmode );
+
+	/* clear it out just in case */
+	memset (&sinfo, 0, sizeof(sinfo));
+	sinfo.ImgDef.xyDpi.x   = ndpi;
+	sinfo.ImgDef.xyDpi.y   = ndpi;
+	sinfo.ImgDef.crArea.x  = left;  /* offset from left edge to area you want to scan */
+	sinfo.ImgDef.crArea.y  = top;  	/* offset from top edge to area you want to scan  */
+	sinfo.ImgDef.crArea.cx = width; /* always relative to 300 dpi */
+	sinfo.ImgDef.crArea.cy = height;
+	sinfo.ImgDef.wDataType = scanmode;
+
+/*
+ * CHECK: what about the 10 bit mode?
+ */
+#if 0
+	if( COLOR_TRUE48 == scanmode )
+		sinfo.ImgDef.wBits = OUTPUT_12Bits;
+	else if( COLOR_TRUE32 == scanmode )
+		sinfo.ImgDef.wBits = OUTPUT_10Bits;
+	else
+		sinfo.ImgDef.wBits = OUTPUT_8Bits;
+#endif
+	sinfo.ImgDef.dwFlag = SCANDEF_QualityScan;
+
+	switch( s->val[OPT_EXT_MODE].w ) {
+		case 1: sinfo.ImgDef.dwFlag |= SCANDEF_Transparency; break;
+		case 2: sinfo.ImgDef.dwFlag |= SCANDEF_Negative; 	 break;
+		default: break;
+	}
+
+	/* only for parallel-port devices */
+	if( s->hw->putImgInfo ) {
+		result = s->hw->putImgInfo( s->hw, &sinfo.ImgDef );
+		if( result < 0 ) {
+			DBG( _DBG_ERROR, "dev->putImgInfo failed(%d)\n", result );
+			s->hw->close( s->hw );
+			return SANE_STATUS_IO_ERROR;
+		}
+	} else {
+
+		memcpy( &(crop.ImgDef), &sinfo.ImgDef, sizeof(ImgDef));
+
+	}
+
+	result = s->hw->getCropInfo( s->hw, &crop );
+	if( result < 0 ) {
+	    DBG( _DBG_ERROR, "dev->getCropInfo() failed(%d)\n", result );
+		s->hw->close( s->hw );
+    	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 */
+	sinfo.ImgDef.dwFlag |= (SCANDEF_BuildBwMap | SCANDEF_QualityScan);
+
+    /* set adjustments for brightness and contrast */
+	sinfo.siBrightness = s->val[OPT_BRIGHTNESS].w;
+	sinfo.siContrast   = s->val[OPT_CONTRAST].w;
+	sinfo.wDither	   = s->val[OPT_HALFTONE].w;
+
+	DBG( _DBG_SANE_INIT, "bright %i contrast %i\n", sinfo.siBrightness,
+   			 									       sinfo.siContrast);
+
+	result = s->hw->setScanEnv( s->hw, &sinfo );
+	if( result < 0 ) {
+		DBG( _DBG_ERROR, "dev->setEnv() failed(%d)\n", result );
+		s->hw->close( s->hw );
+		return SANE_STATUS_IO_ERROR;
+    }
+
+	/* download gamma correction tables... */
+	if( scanmode <= COLOR_256GRAY || scanmode == COLOR_GRAY16 ) {
+	   	s->hw->setMap( s->hw, s->gamma_table[0], s->gamma_length, _MAP_MASTER);
+	} else {
+	   	s->hw->setMap( s->hw, s->gamma_table[1], s->gamma_length, _MAP_RED   );
+   		s->hw->setMap( s->hw, s->gamma_table[2], s->gamma_length, _MAP_GREEN );
+   		s->hw->setMap( s->hw, s->gamma_table[3], s->gamma_length, _MAP_BLUE  );
+    }
+	/* work-around for USB... */
+	start.dwLinesPerScan = s->params.lines;
+
+	result = s->hw->startScan( s->hw, &start );
+	if( result < 0 ) {
+		DBG( _DBG_ERROR, "dev->startScan() failed(%d)\n", result );
+		s->hw->close( s->hw );
+		return SANE_STATUS_IO_ERROR;
+    }
+
+	DBG( _DBG_SANE_INIT, "dwflag = 0x%lx dwBytesPerLine = %ld, "
+		 "dwLinesPerScan = %ld\n",
+					 start.dwFlag, start.dwBytesPerLine, start.dwLinesPerScan);
+
+	s->buf = realloc( s->buf, (s->params.lines) * s->params.bytes_per_line );
+	if( NULL == s->buf ) {
+		DBG( _DBG_ERROR, "realloc failed\n" );
+		s->hw->close( s->hw );
+		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;
+		s->hw->close( s->hw );
+		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 );
+
+	if( s->reader_pid == -1 ) {
+		DBG( _DBG_ERROR, "ERROR: could not create child process\n" );
+		s->scanning = SANE_FALSE;
+		s->hw->close( s->hw );
+		return SANE_STATUS_IO_ERROR;
+	}
+
+	/* reader_pid = 0 ===> child process */
+#if 0
+	if( 0 == s->reader_pid ) {
+
+		sigset_t 		 ignore_set;
+		struct SIGACTION act;
+
+		DBG( _DBG_SANE_INIT, "reader process...\n" );
+
+		close(fds[0]);
+
+		sigfillset ( &ignore_set );
+		sigdelset  ( &ignore_set, SIGTERM );
+		sigprocmask( SIG_SETMASK, &ignore_set, 0 );
+
+		memset   ( &act, 0, sizeof (act));
+		sigaction( SIGTERM, &act, 0 );
+
+		status = reader_process( s, fds[1] );
+
+		DBG( _DBG_SANE_INIT, "reader process done, status = %i\n", status );
+
+		/* don't use exit() since that would run the atexit() handlers */
+		_exit( status );
+	}
+#endif
+	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 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 had already 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 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 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: can´t 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 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_PP.C .........................................................*/