Initial import of sane-backends version 1.0.24-1.2

1 files changed, 1869 insertions, 0 deletions

diff --git a/backend/u12.c b/backend/u12.c
new file mode 100644
index 0000000..8401a9f
--- /dev/null
+++ b/backend/u12.c
@@ -0,0 +1,1869 @@
+/** @file u12.c
+ *  @brief SANE backend for USB scanner, based on Plusteks' ASIC P98003 and
+ *         the GeneSys Logic GL640 parallel-port to USB bridge.
+ *
+ * Based on source aquired from Plustek<br>
+ * Copyright (c) 2003-2004 Gerhard Jaeger <gerhard@gjaeger.de><br>
+ *
+ * History:
+ * - 0.01 - initial version
+ * - 0.02 - enabled other scan-modes
+ *        - increased default gamma to 1.5
+ *.
+ * <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>
+ */
+
+#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>
+
+#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 "0.02-11"
+#define BACKEND_NAME    u12
+#include "../include/sane/sanei_backend.h"
+#include "../include/sane/sanei_config.h"
+#include "../include/sane/sanei_thread.h"
+#include "../include/sane/sanei_usb.h"
+
+#define ALL_MODES
+
+#include "u12-scanner.h"
+#include "u12-hwdef.h"
+#include "u12.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_IO        128
+#define _DBG_READ      255
+
+/* uncomment this for testing... */
+/*#define _FAKE_DEVICE
+ */
+/*****************************************************************************/
+
+#define _SECTION        "[usb]"
+#define _DEFAULT_DEVICE "auto"
+
+/* including the "worker" code... */
+#include "u12-io.c"
+#include "u12-ccd.c"
+#include "u12-hw.c"
+#include "u12-motor.c"
+#include "u12-image.c"
+#include "u12-map.c"
+#include "u12-shading.c"
+#include "u12-tpa.c"
+#include "u12-if.c"
+
+/************************** global vars **************************************/
+
+static int                 num_devices;
+static U12_Device         *first_dev;
+static U12_Scanner        *first_handle;
+static const SANE_Device **devlist = 0;
+static unsigned long       tsecs   = 0;
+static SANE_Bool           cancelRead;
+
+#ifdef ALL_MODES
+static ModeParam mode_params[] =
+{
+	{0, 1,  COLOR_BW},
+	{0, 8,  COLOR_256GRAY},
+	{1, 8,  COLOR_TRUE24},
+	{1, 16, COLOR_TRUE42}
+};
+
+static const SANE_String_Const mode_list[] =
+{
+	SANE_VALUE_SCAN_MODE_LINEART,
+	SANE_VALUE_SCAN_MODE_GRAY,
+	SANE_VALUE_SCAN_MODE_COLOR,
+	SANE_I18N("Color 36"),
+	NULL
+};
+
+static const SANE_String_Const src_list[] =
+{
+	SANE_I18N("Normal"),
+	SANE_I18N("Transparency"),
+	SANE_I18N("Negative"),
+	NULL
+};
+#endif
+
+static const SANE_Range percentage_range =
+{
+	-100 << SANE_FIXED_SCALE_SHIFT, /* minimum 		*/
+	 100 << SANE_FIXED_SCALE_SHIFT, /* maximum 		*/
+	   1 << SANE_FIXED_SCALE_SHIFT  /* quantization */
+};
+
+/* 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,"USB-ID       : >%s<\n",cnf->usbId                 );
+	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,"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 drvClose( U12_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 */
+		u12if_stopScan( dev );
+		u12if_close   ( dev );
+	}
+	dev->fd = -1;
+	return SANE_STATUS_GOOD;
+}
+
+/** as the name says, close our pipes
+ * @param scanner -
+ * @return
+ */
+static SANE_Status drvClosePipes( U12_Scanner *scanner )
+{
+	if( scanner->r_pipe >= 0 ) {
+
+		DBG( _DBG_PROC, "drvClosePipes(r_pipe)\n" );
+		close( scanner->r_pipe );
+		scanner->r_pipe = -1;
+	}
+	if( scanner->w_pipe >= 0 ) {
+
+		DBG( _DBG_PROC, "drvClosePipes(w_pipe)\n" );
+		close( scanner->w_pipe );
+		scanner->w_pipe = -1;
+	}
+
+	return SANE_STATUS_EOF;
+}
+
+#ifdef ALL_MODES
+/** according to the mode and source we return the corresponding mode list
+ */
+static pModeParam getModeList( U12_Scanner *scanner )
+{
+	pModeParam mp = mode_params;
+
+	/* the transparency/negative mode supports only gray and color
+	 */
+	if( 0 != scanner->val[OPT_EXT_MODE].w ) {
+		mp = &mp[_TPAModeSupportMin];
+	}
+
+	return mp;
+}
+#endif
+
+/** 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;
+}
+
+/**
+ */
+static void sig_chldhandler( int signo )
+{
+	DBG( _DBG_PROC, "(SIG) 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, "(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
+ */
+static int reader_process( void *args )
+{
+	int              line;
+	unsigned char   *buf;
+	unsigned long    data_length;
+	struct SIGACTION act;
+	sigset_t         ignore_set;
+	SANE_Status      status;
+	
+	U12_Scanner *scanner = (U12_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 );
+
+	cancelRead = SANE_FALSE;
+
+	/* install the signal handler */
+	memset( &act, 0, sizeof (act));
+	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 scanner... */
+	buf    = scanner->buf;
+	status = u12if_prepare( scanner->hw );
+	
+	if( SANE_STATUS_GOOD == status ) {
+
+		for( line = 0; line < scanner->params.lines; line++ ) {
+
+			status = u12if_readLine( scanner->hw, buf );
+			if( SANE_STATUS_GOOD != status ) {
+				break;
+			}
+
+			write( scanner->w_pipe, buf, scanner->params.bytes_per_line );
+    		buf += scanner->params.bytes_per_line;
+		}
+	}
+
+	close( scanner->w_pipe );
+	scanner->w_pipe = -1;
+
+	/* on error, there's no need to clean up, as this is done by the parent */
+	if( SANE_STATUS_GOOD != status ) {
+		DBG( _DBG_ERROR, "read failed, status = %i\n", (int)status );
+		return status;
+	}
+
+	DBG( _DBG_PROC, "reader_process: finished reading data\n" );
+	return SANE_STATUS_GOOD;
+}
+
+/** stop the current scan process
+ */
+static SANE_Status do_cancel( U12_Scanner *scanner, SANE_Bool closepipe )
+{
+	struct SIGACTION act;
+	SANE_Pid         res;
+
+	DBG( _DBG_PROC,"do_cancel\n" );
+
+	scanner->scanning = SANE_FALSE;
+
+	if( scanner->reader_pid != -1 ) {
+
+		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 = -1;
+		DBG( _DBG_PROC, "reader_process killed\n");
+
+		if( scanner->hw->fd >= 0 ) {
+			u12hw_CancelSequence( scanner->hw );
+		}
+#ifndef HAVE_SETITIMER
+		u12hw_StartLampTimer( scanner->hw );
+#endif
+	}
+
+	if( SANE_TRUE == closepipe ) {
+		drvClosePipes( scanner );
+	}
+
+	drvClose( scanner->hw );
+
+	if( tsecs != 0 ) {
+		DBG( _DBG_INFO, "TIME END 2: %lus\n", time(NULL)-tsecs);
+		tsecs = 0;
+	}
+
+	return SANE_STATUS_CANCELLED;
+}
+
+/** initialize the options for the backend according to the device we have
+ */
+static SANE_Status init_options( U12_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;
+
+#ifdef ALL_MODES
+	/* 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_list;
+	s->val[OPT_MODE].w     = COLOR_TRUE24;
+
+	/* 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 = src_list;
+	s->val[OPT_EXT_MODE].w = 0; /* Normal */
+#endif
+	/* 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;
+	
+	u12map_InitGammaSettings( s->hw );
+
+	/* 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->hw->gamma_table[0][0]);
+	s->opt[OPT_GAMMA_VECTOR].constraint.range = &(s->hw->gamma_range);
+	s->opt[OPT_GAMMA_VECTOR].size = s->hw->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->hw->gamma_table[1][0]);
+	s->opt[OPT_GAMMA_VECTOR_R].constraint.range = &(s->hw->gamma_range);
+	s->opt[OPT_GAMMA_VECTOR_R].size = s->hw->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->hw->gamma_table[2][0]);
+	s->opt[OPT_GAMMA_VECTOR_G].constraint.range = &(s->hw->gamma_range);
+	s->opt[OPT_GAMMA_VECTOR_G].size = s->hw->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->hw->gamma_table[3][0]);
+	s->opt[OPT_GAMMA_VECTOR_B].constraint.range = &(s->hw->gamma_range);
+	s->opt[OPT_GAMMA_VECTOR_B].size = s->hw->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;
+
+#ifdef ALL_MODES
+	/* disable extended mode list for devices without TPA */
+	if( SANE_FALSE == s->hw->Tpa ) {
+		s->opt[OPT_EXT_MODE].cap |= SANE_CAP_INACTIVE;
+	}
+#endif
+	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
+ */
+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
+ */
+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, U12_Device **devp )
+{
+	int         result;
+	int         handle;
+	U12_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->sane.model  = "U12/1212U";
+	dev->sane.type   = SANE_I18N ("flatbed scanner");
+	dev->initialized = SANE_FALSE;
+
+	memcpy( &dev->adj, &cnf->adj, sizeof(AdjDef));
+	show_cnf( cnf );
+
+	strncpy( dev->usbId, cnf->usbId, _MAX_ID_LEN );
+	
+	/* go ahead and open the scanner device */
+	handle = u12if_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;
+
+	/* now check what we have */
+	result = u12if_getCaps( dev );
+	if( result < 0 ) {
+		DBG( _DBG_ERROR, "u12if_getCaps() failed(%d)\n", result);
+		u12if_close( dev );
+		return SANE_STATUS_IO_ERROR;
+    }
+
+	/* save the info we got from the driver */
+	DBG( _DBG_INFO, "Scanner information:\n" );
+	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.flag  );
+
+	if( SANE_STATUS_GOOD != u12if_SetupBuffer( dev )) {
+		DBG( _DBG_ERROR, "u12if_SetupBuffer() failed\n" );
+		u12if_close( dev );
+		return SANE_STATUS_NO_MEM;
+	}
+
+	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 )
+{
+	memset( cnf, 0, sizeof(CnfDef));
+
+	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;
+
+	DBG_INIT();
+
+	sanei_usb_init();
+	sanei_thread_init();
+
+	DBG( _DBG_INFO, "U12 backend V"
+	                BACKEND_VERSION", part of "PACKAGE " " VERSION "\n");
+
+	/* 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(SANE_CURRENT_MAJOR, V_MINOR, 0);
+
+	fp = sanei_config_open( U12_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);
+			
+			ival = 0;
+
+			dval = 1.5;
+			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 sane_exit( void )
+{
+	U12_Device *dev, *next;
+
+	DBG( _DBG_SANE_INIT, "sane_exit\n" );
+
+	for( dev = first_dev; dev; ) {
+
+		next = dev->next;
+
+		u12if_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 );
+
+	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;
+	U12_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;
+	U12_Device  *dev;
+	U12_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 sane_close( SANE_Handle handle )
+{
+	U12_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;
+	}
+
+	drvClosePipes( s );
+
+	if( NULL != s->buf )
+		free(s->buf);
+
+	if( NULL != s->hw->bufs.b1.pReadBuf )
+		free( s->hw->bufs.b1.pReadBuf );
+
+	if( NULL != s->hw->shade.pHilight )
+		free( s->hw->shade.pHilight );
+
+	if( NULL != s->hw->scaleBuf )
+		free( s->hw->scaleBuf );
+
+	drvClose( s->hw );
+
+	if (prev)
+    	prev->next = s->next;
+	else
+		first_handle = s->next;
+
+	free(s);
+}
+
+/** 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)
+{
+	U12_Scanner             *s = (U12_Scanner *)handle;
+	SANE_Status              status;
+	const SANE_String_Const *optval;
+#ifdef ALL_MODES
+	pModeParam               mp;
+	int                      idx;
+#endif
+	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;
+
+#ifdef ALL_MODES
+			case OPT_MODE:
+			case OPT_EXT_MODE:
+				strcpy ((char *) value,
+					  s->opt[option].constraint.string_list[s->val[option].w]);
+				break;
+#endif
+
+	  		/* 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;
+
+#ifdef ALL_MODES
+					mp = getModeList( s );
+					scanmode = mp[s->val[OPT_MODE].w].scanmode;
+#else
+					scanmode = COLOR_TRUE24;
+#endif
+
+				    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 ) {
+						    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 {
+	
+						u12map_InitGammaSettings( s->hw );
+    				
+    					if( scanmode == COLOR_256GRAY ) {
+						    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;
+
+#ifdef ALL_MODES
+		    	case OPT_MODE: 
+                    idx = (optval - mode_list);
+					mp  = getModeList( s );
+					
+					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 ) {
+						    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;
+
+			    	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->opt[OPT_MODE].constraint.string_list = mode_list;
+	    				s->val[OPT_MODE].w = COLOR_TRUE24;
+
+				    } 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);
+    					}
+	    				s->opt[OPT_MODE].constraint.string_list =
+											&mode_list[_TPAModeSupportMin];
+						s->val[OPT_MODE].w = 0;		/* COLOR_24 is the default */
+        			}
+
+				    s->opt[OPT_CONTRAST].cap &= ~SANE_CAP_INACTIVE;
+
+    				if( NULL != info )
+	    				*info |= SANE_INFO_RELOAD_OPTIONS | SANE_INFO_RELOAD_PARAMS;
+		    		break;
+	            }
+#endif
+				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 );
+					u12map_CheckGammaSettings(s->hw);
+					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 )
+{
+	U12_Scanner *s = (U12_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;
+#ifdef ALL_MODES
+	pModeParam   mp;
+#endif
+	U12_Scanner *s = (U12_Scanner *)handle;
+
+	/* if we're called 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)) {
+
+#ifdef ALL_MODES
+		mp = getModeList( s );
+#endif
+		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;
+#ifdef ALL_MODES
+		s->params.depth = mp[s->val[OPT_MODE].w].depth;
+#else
+		s->params.depth = 8;
+		s->params.format = SANE_FRAME_RGB;
+		s->params.bytes_per_line = 3 * s->params.pixels_per_line;
+#endif
+
+#ifdef ALL_MODES
+		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;
+		}
+#endif
+
+        /* 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 )
+{
+	U12_Scanner *s = (U12_Scanner *)handle;
+	U12_Device  *dev;
+#ifdef ALL_MODES
+	ModeParam   *mp;
+#endif
+	int         result;
+	int         ndpi;
+	int         left, top;
+	int         width, height;
+	int         scanmode;
+	int         fds[2];
+	double      dpi_x, dpi_y;
+	ImgDef      image;
+	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 = u12if_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;
+	}
+
+	tsecs = 0;
+
+	result = u12if_getCaps( dev );
+	if( result < 0 ) {
+		DBG( _DBG_ERROR, "u12if_getCaps() failed(%d)\n", result);
+		u12if_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->dpi_max_x;
+	dpi_y = (double)dev->dpi_max_y;
+
+	left   = (int)(SANE_UNFIX(s->val[OPT_TL_X].w)* dpi_x/
+	                                     (_MM_PER_INCH*(dpi_x/_MEASURE_BASE)));
+	top    = (int)(SANE_UNFIX(s->val[OPT_TL_Y].w)*dpi_y/
+	                                     (_MM_PER_INCH*(dpi_y/_MEASURE_BASE)));
+	width  = (int)(SANE_UNFIX(s->val[OPT_BR_X].w - s->val[OPT_TL_X].w) *
+	                            dpi_x / (_MM_PER_INCH *(dpi_x/_MEASURE_BASE)));
+	height = (int)(SANE_UNFIX(s->val[OPT_BR_Y].w - s->val[OPT_TL_Y].w) *
+	                            dpi_y / (_MM_PER_INCH *(dpi_y/_MEASURE_BASE)));
+
+	if((width == 0) || (height == 0)) {
+		DBG( _DBG_ERROR, "invalid width or height!\n" );
+		return SANE_STATUS_INVAL;
+	}
+
+	/* adjust mode list according to the model we use and the source we have
+	 */
+#ifdef ALL_MODES
+	mp = getModeList( s );
+	scanmode = mp[s->val[OPT_MODE].w].scanmode;
+#else
+	scanmode = COLOR_TRUE24;
+#endif
+	DBG( _DBG_INFO, "scanmode = %u\n", scanmode );
+
+	/* clear it out just in case */
+	memset (&image, 0, sizeof(ImgDef));
+
+	/* this is what we want */
+	image.xyDpi.x   = ndpi;
+	image.xyDpi.y   = ndpi;
+	image.crArea.x  = left;  /* offset from left edge to area you want to scan */
+	image.crArea.y  = top;   /* offset from top edge to area you want to scan  */
+	image.crArea.cx = width; /* always relative to 300 dpi */
+	image.crArea.cy = height;
+	image.wDataType = scanmode;
+
+#ifdef ALL_MODES
+	switch( s->val[OPT_EXT_MODE].w ) {
+		case 1: image.dwFlag |= _SCANDEF_Transparency; break;
+		case 2: image.dwFlag |= _SCANDEF_Negative;     break;
+		default: break;
+	}
+#endif
+
+#if 0
+	if( s->val[OPT_PREVIEW].w )
+		image.dwFlag |= _SCANDEF_PREVIEW;
+#endif
+    /* set adjustments for brightness and contrast */
+	dev->DataInf.siBrightness = s->val[OPT_BRIGHTNESS].w;
+	dev->DataInf.siContrast   = s->val[OPT_CONTRAST].w;
+
+	DBG( _DBG_SANE_INIT, "brightness %i, contrast %i\n",
+	                     dev->DataInf.siBrightness, dev->DataInf.siContrast );
+
+	result = u12image_SetupScanSettings( dev, &image );
+	if( SANE_STATUS_GOOD != result ) {
+		DBG( _DBG_ERROR, "u12image_SetupScanSettings() failed(%d)\n", result );
+		u12if_close( dev );
+		return SANE_STATUS_IO_ERROR;
+	}
+
+	s->params.pixels_per_line = dev->DataInf.dwAppPixelsPerLine;
+	s->params.bytes_per_line  = dev->DataInf.dwAppBytesPerLine;
+	s->params.lines           = dev->DataInf.dwAppLinesPerArea;
+
+	DBG( _DBG_INFO, "* PixelPerLine = %u\n", s->params.pixels_per_line );
+	DBG( _DBG_INFO, "* BytesPerLine = %u\n", s->params.bytes_per_line  );
+	DBG( _DBG_INFO, "* Lines        = %u\n", s->params.lines  );
+
+	/* reset our timer...*/
+	tsecs = 0;
+
+	s->buf = realloc( s->buf, (s->params.lines) * s->params.bytes_per_line );
+	if( NULL == s->buf ) {
+		DBG( _DBG_ERROR, "realloc failed\n" );
+		u12if_close( dev );
+		return SANE_STATUS_NO_MEM;
+	}
+
+	result = u12if_startScan( dev );
+	if( SANE_STATUS_GOOD != result ) {
+		DBG( _DBG_ERROR, "u12if_startScan() failed(%d)\n", result );
+		u12if_close( dev );
+		return SANE_STATUS_IO_ERROR;
+    }
+
+	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;
+		u12if_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 == -1 ) {
+		DBG( _DBG_ERROR, "ERROR: could not start reader task\n" );
+		s->scanning = SANE_FALSE;
+		u12if_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 sane_read( SANE_Handle handle, SANE_Byte *data,
+                       SANE_Int max_length, SANE_Int *length )
+{
+	U12_Scanner *s = (U12_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 drvClosePipes(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 ) {
+			drvClosePipes(s);
+			return s->exit_code;
+		}
+		s->reader_pid = -1;
+		return drvClosePipes(s);
+	}
+
+	return SANE_STATUS_GOOD;
+}
+
+/** cancel the scanning process
+ */
+void sane_cancel( SANE_Handle handle )
+{
+	U12_Scanner *s = (U12_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 )
+{
+	U12_Scanner *s = (U12_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 )
+{
+	U12_Scanner *s = (U12_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 U12.C ................................................................*/