Initial import of sane-backends version 1.0.24-1.2

1 files changed, 1666 insertions, 0 deletions

diff --git a/backend/plustek-usbscan.c b/backend/plustek-usbscan.c
new file mode 100644
index 0000000..c8824fc
--- /dev/null
+++ b/backend/plustek-usbscan.c
@@ -0,0 +1,1666 @@
+/*.............................................................................
+ * Project : SANE library for Plustek flatbed scanners.
+ *.............................................................................
+ */
+
+/** @file plustek-usbscan.c
+ *  @brief Scanning...
+ *
+ * Based on sources acquired from Plustek Inc.<br>
+ * Copyright (C) 2001-2013 Gerhard Jaeger <gerhard@gjaeger.de>
+ *
+ * History:
+ * - 0.40 - starting version of the USB support
+ * - 0.41 - minor fixes
+ * - 0.42 - added some stuff for CIS devices
+ * - 0.43 - no changes
+ * - 0.44 - added CIS specific settings and calculations
+ *        - removed usb_IsEscPressed
+ * - 0.45 - fixed the special setting stuff for CanoScan
+ *        - fixed pixel calculation for binary modes
+ *        - fixed cancel hang problem
+ *        - fixed CIS PhyBytes adjustment
+ *        - removed CanoScan specific setting stuff
+ * - 0.46 - fixed problem in usb_SetScanParameters()
+ * - 0.47 - no changes
+ * - 0.48 - minor fixes
+ * - 0.49 - a_bRegs is now part of the device structure
+ *        - using now PhyDpi.y as selector for the motor MCLK range
+ *        - changed usb_MapDownload prototype
+ * - 0.50 - cleanup
+ * - 0.51 - added usb_get_res() and usb_GetPhyPixels()
+ * - 0.52 - removed stuff, that will most probably never be used
+ * .
+ * <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>
+ */
+
+#define DIVIDER 8
+
+/** array used to get motor-settings and mclk-settings
+ */
+static int dpi_ranges[] = { 75,100,150,200,300,400,600,800,1200,2400 };
+
+static u_char     bMaxITA;
+
+static SANE_Bool  m_fAutoPark;
+static SANE_Bool  m_fFirst;
+static double     m_dHDPIDivider;
+static double     m_dMCLKDivider;
+static ScanParam *m_pParam;
+static u_char     m_bLineRateColor;
+static u_char     m_bCM;
+static u_char	  m_bIntTimeAdjust;
+static u_char	  m_bOldScanData;
+static u_short    m_wFastFeedStepSize;
+static u_short    m_wLineLength;
+static u_short	  m_wStepSize;
+static u_long     m_dwPauseLimit;
+
+static SANE_Bool  m_fStart = SANE_FALSE;
+
+/* Prototype... */
+static SANE_Bool usb_DownloadShadingData( Plustek_Device*, u_char );
+
+/** returns the min of the two values val1 and val2
+ * @param val1 - first parameter
+ * @param val2 - second parameter
+ * @return val1 if val1 < val2, else val1
+ */
+static u_long
+usb_min( u_long val1, u_long val2 )
+{
+	if( val1 > val2 )
+		return val2;
+	return val1;
+}
+
+/** returns the max of the two values val1 and val2
+ * @param val1 - first parameter
+ * @param val2 - second parameter
+ * @return val1 if val1 > val2, else val2
+ */
+static u_long
+usb_max( u_long val1, u_long val2 )
+{
+	if( val1 > val2 )
+		return val1;
+	return val2;
+}
+
+/** function to get the possible resolution for a specific base resolution,
+ * according to the dividers a LM983x offers.
+ * @param base - scanners optical resolution
+ * @param idx  - which divider to use
+ */
+static u_short
+usb_get_res( u_short base, u_short idx )
+{
+	double div_list[DIVIDER] = { 12.0, 8.0, 6.0, 4.0, 3.0, 2.0, 1.5, 1.0 };
+
+	if( idx == 0 || idx > DIVIDER )
+		return 0;
+
+	return (u_short)((double)base/div_list[idx-1]);
+}
+
+/** Set the horizontal DPI divider.
+ * Affected registers:<br>
+ * 0x09 - Horizontal DPI divider HDPI_DIV<br>
+ *
+ * @param dev  - pointer to our device structure,
+ *               it should contain all we need
+ * @param xdpi - user specified horizontal resolution
+ * @return - the function returns the "normalized" horizontal resolution.
+ */
+static u_short
+usb_SetAsicDpiX( Plustek_Device *dev, u_short xdpi )
+{
+	u_short   res;
+	ScanDef  *scanning = &dev->scanning;
+	DCapsDef *scaps    = &dev->usbDev.Caps;
+	u_char   *regs     = dev->usbDev.a_bRegs;
+
+	/* limit xdpi to lower value for certain devices...
+	 */
+	if( scaps->OpticDpi.x == 1200 &&
+		scanning->sParam.bDataType != SCANDATATYPE_Color &&
+		xdpi < 150 &&
+		scanning->sParam.bDataType == SCANDATATYPE_BW ) {
+		xdpi = 150;
+		DBG( _DBG_INFO2, "* LIMIT XDPI to %udpi\n", xdpi );
+	}
+
+	m_dHDPIDivider = (double)scaps->OpticDpi.x / xdpi;
+
+	if (m_dHDPIDivider < 1.5)
+	{
+		m_dHDPIDivider = 1.0;
+		regs[0x09]  = 0;
+	}
+	else if (m_dHDPIDivider < 2.0)
+	{
+		m_dHDPIDivider = 1.5;
+		regs[0x09]  = 1;
+	}
+	else if (m_dHDPIDivider < 3.0)
+	{
+		m_dHDPIDivider = 2.0;
+		regs[0x09]  = 2;
+	}
+	else if (m_dHDPIDivider < 4.0)
+	{
+		m_dHDPIDivider = 3.0;
+		regs[0x09]  = 3;
+	}
+	else if (m_dHDPIDivider < 6.0)
+	{
+		m_dHDPIDivider = 4.0;
+		regs[0x09]  = 4;
+	}
+	else if (m_dHDPIDivider < 8.0)
+	{
+		m_dHDPIDivider = 6.0;
+		regs[0x09]  = 5;
+	}
+	else if (m_dHDPIDivider < 12.0)
+	{
+		m_dHDPIDivider = 8.0;
+		regs[0x09]  = 6;
+	}
+	else
+	{
+		m_dHDPIDivider = 12.0;
+		regs[0x09]  = 7;
+	}
+
+	/* adjust, if any turbo/preview mode is set, should be 0 here... */
+	if( regs[0x0a] )
+		regs[0x09] -= ((regs[0x0a] >> 2) + 2);
+
+	DBG( _DBG_INFO2, "* HDPI: %.3f\n", m_dHDPIDivider );
+	res = (u_short)((double)scaps->OpticDpi.x / m_dHDPIDivider);
+
+	DBG( _DBG_INFO2, "* XDPI=%u, HDPI=%.3f\n", res, m_dHDPIDivider );
+	return res;
+}
+
+/**
+ * @param dev  - pointer to our device structure,
+ *               it should contain all we need
+ * @param ydpi - user specified vertical resolution
+ * @return -
+ */
+static u_short
+usb_SetAsicDpiY( Plustek_Device *dev, u_short ydpi )
+{
+	ScanDef  *scanning = &dev->scanning;
+	DCapsDef *sCaps    = &dev->usbDev.Caps;
+	HWDef    *hw       = &dev->usbDev.HwSetting;
+
+	u_short wMinDpi, wDpi;
+
+	if(0 != sCaps->bSensorDistance )
+		wMinDpi = sCaps->OpticDpi.y / sCaps->bSensorDistance;
+	else
+		wMinDpi = 75;
+
+	/* Here we might have to check against the MinDpi value ! */
+	wDpi = (ydpi + wMinDpi - 1) / wMinDpi * wMinDpi;
+
+	/*
+	 * HEINER: added '*2'
+	 */
+	if( wDpi > sCaps->OpticDpi.y * 2 )
+		wDpi = sCaps->OpticDpi.y * 2;
+
+	if( (hw->motorModel == MODEL_Tokyo600) ||
+		!_IS_PLUSTEKMOTOR(hw->motorModel)) {
+		/* return wDpi; */
+	} else if( sCaps->wFlags & DEVCAPSFLAG_Adf && sCaps->OpticDpi.x == 600 ) {
+		/* for ADF scanner color mode 300 dpi big noise */
+		if( scanning->sParam.bDataType == SCANDATATYPE_Color &&
+			scanning->sParam.bBitDepth > 8 && wDpi < 300 ) {
+			wDpi = 300;
+		}
+	} else if( sCaps->OpticDpi.x == 1200 ) {
+		if( scanning->sParam.bDataType != SCANDATATYPE_Color && wDpi < 200) {
+			wDpi = 200;
+		}
+	}
+
+	DBG( _DBG_INFO2, "* YDPI=%u, MinDPIY=%u\n", wDpi, wMinDpi );
+	return wDpi;
+}
+
+/** set color mode and sensor configuration stuff, according to the data mode
+ * Affected registers:<br>
+ * 0x26 - 0x27 - Color Mode settings<br>
+ * 0x0f - 0x18 - Sensor Configuration - directly from the HwDefs<br>
+ * 0x09        - add Data Mode and Pixel Packing<br>
+ *
+ * @param dev    - pointer to our device structure,
+ *                 it should contain all we need
+ * @param pParam - pointer to the current scan parameters
+ * @return - Nothing
+ */
+static void
+usb_SetColorAndBits( Plustek_Device *dev, ScanParam *pParam )
+{
+	HWDef    *hw   = &dev->usbDev.HwSetting;
+	u_char   *regs = dev->usbDev.a_bRegs;
+
+	/* Set pixel packing, data mode and AFE operation */
+	switch( pParam->bDataType ) {
+		case SCANDATATYPE_Color:
+			m_bCM = 3;
+			regs[0x26] = hw->bReg_0x26 & 0x7;
+
+			/* if set to one channel color, we select the blue channel
+			 * as input source, this is the default, but I don't know
+			 * what happens, if we deselect this
+			 */
+			if( regs[0x26] & _ONE_CH_COLOR )
+				regs[0x26] |= (_BLUE_CH | 0x01);
+
+			memcpy( &regs[0x0f], hw->bReg_0x0f_Color, 10 );
+			break;
+
+		case SCANDATATYPE_Gray:
+			m_bCM = 1;
+			regs[0x26] = (hw->bReg_0x26 & 0x18) | 0x04;
+			memcpy( &regs[0x0f], hw->bReg_0x0f_Mono, 10 );
+			break;
+
+		case SCANDATATYPE_BW:
+			m_bCM = 1;
+			regs[0x26] = (hw->bReg_0x26 & 0x18) | 0x04;
+			memcpy( &regs[0x0f], hw->bReg_0x0f_Mono, 10 );
+			break;
+	}
+
+	regs[0x27] = hw->bReg_0x27;
+
+	if( pParam->bBitDepth > 8 ) {
+		regs[0x09] |= 0x20;         /* 14/16bit image data */
+
+	} else if( pParam->bBitDepth == 8 ) {
+		regs[0x09] |= 0x18;        /* 8bits/per pixel */
+	}
+}
+
+/**
+ * Data output from NS983X should be times of 2-byte and every line
+ * will append 2 status bytes
+ */
+static void
+usb_GetPhyPixels( Plustek_Device *dev, ScanParam *sp )
+{
+	sp->Size.dwValidPixels = sp->Size.dwPixels * sp->PhyDpi.x / sp->UserDpi.x;
+
+	if (sp->bBitDepth == 1) {
+
+		/* Pixels should be times of 16 */
+		sp->Size.dwPhyPixels =
+		            (sp->Size.dwValidPixels + 15UL) & 0xfffffff0UL;
+		sp->Size.dwPhyBytes = sp->Size.dwPhyPixels / 8UL + 2UL;
+
+	} else if (sp->bBitDepth == 8) {
+
+		/* Pixels should be times of 2 */
+		sp->Size.dwPhyPixels = (sp->Size.dwValidPixels + 1UL) & 0xfffffffeUL;
+		sp->Size.dwPhyBytes  = sp->Size.dwPhyPixels * sp->bChannels + 2UL;
+
+		/* need to be adjusted fo CIS devices in color mode */
+		if(usb_IsCISDevice( dev ) && (sp->bDataType == SCANDATATYPE_Color)) {
+			sp->Size.dwPhyBytes *= 3;
+		}
+	}
+	else /* sp->bBitDepth == 16 */
+	{
+		sp->Size.dwPhyPixels = sp->Size.dwValidPixels;
+		sp->Size.dwPhyBytes  = sp->Size.dwPhyPixels * 2 * sp->bChannels + 2UL;
+
+		/* need to be adjusted fo CIS devices in color mode */
+		if(usb_IsCISDevice( dev ) && (sp->bDataType == SCANDATATYPE_Color)) {
+			sp->Size.dwPhyBytes *= 3;
+		}
+	}
+}
+
+/** Calculate basic image settings like the number of physical bytes per line
+ * etc...
+ * Affected registers:<br>
+ * 0x22/0x23 - Data Pixels Start<br>
+ * 0x24/0x25 - Data Pixels End<br>
+ * 0x4a/0x4b - Full Steps to Skip at Start of Scan
+ *
+ * @param dev    - pointer to our device structure,
+ *                 it should contain all we need
+ * @param pParam - pointer to the current scan parameters
+ * @return - Nothing
+ */
+static void
+usb_GetScanRect( Plustek_Device *dev, ScanParam *sp )
+{
+	u_short   wDataPixelStart, wLineEnd;
+
+	DCapsDef *sCaps = &dev->usbDev.Caps;
+	HWDef    *hw    = &dev->usbDev.HwSetting;
+	u_char   *regs  = dev->usbDev.a_bRegs;
+
+	/* Convert pixels to physical dpi based */
+	usb_GetPhyPixels( dev, sp );
+
+	/* Compute data start pixel */
+#if 0
+/* HEINER: check ADF stuff... */
+	if(sp->bCalibration != PARAM_Gain &&
+		sp->bCalibration != PARAM_Offset && ScanInf.m_fADF)
+		wDataPixelStart = 2550 * sCaps->OpticDpi.x / 300UL -
+				(u_short)(m_dHDPIDivider * sp->Size.dwValidPixels + 0.5);
+	else
+#endif
+		wDataPixelStart = (u_short)((u_long)sp->Origin.x *
+		                                            sCaps->OpticDpi.x / 300UL);
+
+	/* during the calibration steps, we read the entire CCD data
+	 */
+	if((sp->bCalibration != PARAM_Gain)&&(sp->bCalibration != PARAM_Offset)) {
+/* HEINER: check ADF stuff... */
+#if 0
+		if(ScanInf.m_fADF) {
+			wDataPixelStart = 2550 * sCaps->OpticDpi.x / 300UL -
+			    (u_short)(m_dHDPIDivider * sp->Size.dwValidPixels + 0.5);
+		}
+#endif
+		wDataPixelStart += hw->wActivePixelsStart;
+	}
+
+	wLineEnd = wDataPixelStart + (u_short)(m_dHDPIDivider *
+	                                               sp->Size.dwPhyPixels + 0.5);
+
+	DBG( _DBG_INFO2, "* DataPixelStart=%u, LineEnd=%u\n",
+	                                               wDataPixelStart, wLineEnd );
+	if( wDataPixelStart & 1 ) {
+
+		wDataPixelStart++;
+		wLineEnd++;
+
+		DBG( _DBG_INFO2, "* DataPixelStart=%u, LineEnd=%u (ADJ)\n",
+		                                           wDataPixelStart, wLineEnd );
+	}
+
+	regs[0x22] = _HIBYTE( wDataPixelStart );
+	regs[0x23] = _LOBYTE( wDataPixelStart );
+
+	/* should match: wLineEnd-wDataPixelStart%(m_dHDPIDivider*2) = 0!! */
+	regs[0x24] = _HIBYTE( wLineEnd );
+	regs[0x25] = _LOBYTE( wLineEnd );
+
+	DBG( _DBG_INFO2, ">> End-Start=%u, HDPI=%.2f\n",
+	                                 wLineEnd-wDataPixelStart, m_dHDPIDivider);
+
+	/* Y origin */
+	if( sp->bCalibration == PARAM_Scan ) {
+
+		if( hw->motorModel == MODEL_Tokyo600 ) {
+
+			if(sp->PhyDpi.x <= 75)
+				sp->Origin.y += 20;
+			else if(sp->PhyDpi.x <= 100)
+			{
+				if (sp->bDataType == SCANDATATYPE_Color)
+					sp->Origin.y += 0;
+				else
+					sp->Origin.y -= 6;
+			}
+			else if(sp->PhyDpi.x <= 150)
+			{
+				if (sp->bDataType == SCANDATATYPE_Color)
+					sp->Origin.y -= 0;
+			}
+			else if(sp->PhyDpi.x <= 200)
+			{
+				if (sp->bDataType == SCANDATATYPE_Color)
+					sp->Origin.y -= 10;
+				else
+					sp->Origin.y -= 4;
+			}
+			else if(sp->PhyDpi.x <= 300)
+			{
+				if (sp->bDataType == SCANDATATYPE_Color)
+					sp->Origin.y += 16;
+				else
+					sp->Origin.y -= 18;
+			}
+			else if(sp->PhyDpi.x <= 400)
+			{
+				if (sp->bDataType == SCANDATATYPE_Color)
+					sp->Origin.y += 15;
+				else if(sp->bDataType == SCANDATATYPE_BW)
+					sp->Origin.y += 4;
+			}
+			else /* if(sp->PhyDpi.x <= 600) */
+			{
+				if (sp->bDataType == SCANDATATYPE_Gray)
+					sp->Origin.y += 4;
+			}
+		}
+
+		/* Add gray mode offset (Green offset, we assume the CCD are
+		 * always be RGB or BGR order).
+		 */
+		if (sp->bDataType != SCANDATATYPE_Color)
+			sp->Origin.y += (u_long)(300UL *
+			           sCaps->bSensorDistance / sCaps->OpticDpi.y);
+	}
+
+	sp->Origin.y=(u_short)((u_long)sp->Origin.y * hw->wMotorDpi/300UL);
+
+	/* Something wrong, but I can not find it. */
+	if( hw->motorModel == MODEL_HuaLien && sCaps->OpticDpi.x == 600)
+		sp->Origin.y = sp->Origin.y * 297 / 298;
+
+	DBG(_DBG_INFO2,"* Full Steps to Skip at Start = 0x%04x\n",
+	                sp->Origin.y);
+
+	regs[0x4a] = _HIBYTE( sp->Origin.y );
+	regs[0x4b] = _LOBYTE( sp->Origin.y );
+}
+
+/** preset scan stepsize and fastfeed stepsize
+ */
+static void
+usb_PresetStepSize( Plustek_Device *dev, ScanParam *pParam )
+{
+	u_short ssize;
+	double  mclkdiv = pParam->dMCLK;
+	HWDef  *hw      = &dev->usbDev.HwSetting;
+	u_char *regs    = dev->usbDev.a_bRegs;
+
+	ssize = (u_short)((double)CRYSTAL_FREQ / ( mclkdiv * 8.0 *
+            (double)m_bCM * hw->dMaxMotorSpeed * 4.0 * (double)hw->wMotorDpi));
+
+	regs[0x46] = _HIBYTE( ssize );
+	regs[0x47] = _LOBYTE( ssize );
+	regs[0x48] = _HIBYTE( ssize );
+	regs[0x49] = _LOBYTE( ssize );
+
+	DBG( _DBG_INFO2, "* StepSize(Preset) = %u (0x%04x)\n", ssize, ssize );
+}
+
+/** calculate default phase difference DPD
+ */
+static void
+usb_GetDPD( Plustek_Device *dev  )
+{
+	int    qtcnt;	/* quarter speed count count reg 51 b2..3 */
+	int    hfcnt;	/* half speed count reg 51 b0..1          */
+	int    strev;   /* steps to reverse reg 50                */
+	int    dpd;     /* calculated dpd reg 52:53               */
+	int    st;      /* step size reg 46:47                    */
+
+	HWDef  *hw    = &dev->usbDev.HwSetting;
+	u_char *regs  = dev->usbDev.a_bRegs;
+
+	qtcnt = (regs[0x51] & 0x30) >> 4;  /* quarter speed count */
+	hfcnt = (regs[0x51] & 0xc0) >> 6;  /* half speed count    */
+
+	if( _LM9831 == hw->chip )
+		strev = regs[0x50] & 0x3f;    /* steps to reverse */
+	else /* LM9832/3 */
+	{
+		if (qtcnt == 3)
+			qtcnt = 8;
+		if (hfcnt == 3)
+			hfcnt = 8;
+		strev = regs[0x50];           /* steps to reverse */
+	}
+
+	st = regs[0x46] * 256 + regs[0x47];     /* scan step size */
+
+	if (m_wLineLength == 0)
+		dpd = 0;
+	else
+	{
+		dpd = (((qtcnt * 4) + (hfcnt * 2) + strev) * 4 * st) %
+		                            (m_wLineLength * m_bLineRateColor);
+		DBG( _DBG_INFO2, "* DPD =%u (0x%04x)\n", dpd, dpd );
+		dpd = m_wLineLength * m_bLineRateColor - dpd;
+	}
+
+	DBG( _DBG_INFO2, "* DPD =%u (0x%04x), step size=%u, steps2rev=%u\n",
+	                  dpd, dpd, st, strev);
+	DBG( _DBG_INFO2, "* llen=%u, lineRateColor=%u, qtcnt=%u, hfcnt=%u\n",
+	                  m_wLineLength, m_bLineRateColor, qtcnt, hfcnt );
+
+	regs[0x51] |= (u_char)((dpd >> 16) & 0x03);
+	regs[0x52] = (u_char)(dpd >> 8);
+	regs[0x53] = (u_char)(dpd & 0xFF);
+}
+
+#define MCLKDIV_SCALING 2
+#define _MIN(a,b) ((a) < (b) ? (a) : (b))
+#define _MAX(a,b) ((a) > (b) ? (a) : (b))
+
+/**
+ */
+static int
+usb_GetMCLKDiv( Plustek_Device *dev )
+{
+	int     j, pixelbits, pixelsperline, r;
+	int     minmclk, maxmclk, mclkdiv;
+	double  hdpi, min_int_time;
+	u_char *regs = dev->usbDev.a_bRegs;
+	HWDef  *hw   = &dev->usbDev.HwSetting;
+
+	DBG( _DBG_INFO, "usb_GetMCLKDiv()\n" );
+
+	r = 8; /* line rate */
+	if ((regs[0x26] & 7) == 0) 
+		r = 24; /* pixel rate */
+
+	/* use high or low res min integration time */
+	min_int_time = ((regs[0x9]&7) > 2 ? hw->dMinIntegrationTimeLowres:
+	                                    hw->dMinIntegrationTimeHighres);
+
+	minmclk = (int)ceil((double) MCLKDIV_SCALING * CRYSTAL_FREQ *
+	                       min_int_time /((double)1000. * r * m_wLineLength));
+	minmclk = _MAX(minmclk,MCLKDIV_SCALING);
+
+	maxmclk = (int)(32.5*MCLKDIV_SCALING + .5); 
+
+	DBG(_DBG_INFO2,"- lower mclkdiv limit=%f\n",(double)minmclk/MCLKDIV_SCALING);
+	DBG(_DBG_INFO2,"- upper mclkdiv limit=%f\n",(double)maxmclk/MCLKDIV_SCALING);
+
+	/* get the bits per pixel */
+	switch (regs[0x9] & 0x38) {
+		case 0:	    pixelbits=1; break;
+		case 0x8:   pixelbits=2; break;
+		case 0x10:  pixelbits=4; break;
+		case 0x18:  pixelbits=8; break;
+		default:	pixelbits=16;break;
+	}
+
+	/* compute the horizontal dpi (pixels per inch) */
+	j    = regs[0x9] & 0x7;
+	hdpi = ((j&1)*.5+1)*(j&2?2:1)*(j&4?4:1);	
+
+	pixelsperline = (int)((256*regs[0x24]+regs[0x25]-256*regs[0x22]-regs[0x23])
+	                       *pixelbits/(hdpi * 8));
+	mclkdiv = (int)ceil((double)MCLKDIV_SCALING * pixelsperline * CRYSTAL_FREQ
+	                /((double) 8. * m_wLineLength * dev->transferRate));
+
+	DBG( _DBG_INFO2, "- hdpi          = %.3f\n", hdpi );
+	DBG( _DBG_INFO2, "- pixelbits     = %u\n", pixelbits );
+	DBG( _DBG_INFO2, "- pixelsperline = %u\n", pixelsperline );
+	DBG( _DBG_INFO2, "- linelen       = %u\n", m_wLineLength );
+	DBG( _DBG_INFO2, "- transferrate  = %lu\n", dev->transferRate );
+	DBG( _DBG_INFO2, "- MCLK Divider  = %u\n", mclkdiv/MCLKDIV_SCALING );
+
+	mclkdiv = _MAX(mclkdiv,minmclk);
+	mclkdiv = _MIN(mclkdiv,maxmclk);
+	DBG( _DBG_INFO2, "- Current MCLK Divider = %u\n", mclkdiv/MCLKDIV_SCALING );
+
+	if( dev->transferRate == 2000000 ) {
+		while (mclkdiv * hdpi < 6.*MCLKDIV_SCALING) {
+			mclkdiv++;
+		}
+		DBG( _DBG_INFO2, "- HIGHSPEED MCLK Divider = %u\n", 
+		     mclkdiv/MCLKDIV_SCALING );
+	}
+
+	return mclkdiv;
+}
+
+/** Plusteks' poor-man MCLK calculation...
+ * at least we give the master clock divider and adjust the step size
+ * and integration time (for 14/16 bit modes)
+ */
+static double
+usb_GetMCLKDivider( Plustek_Device *dev, ScanParam *pParam )
+{
+	double dMaxIntegrationTime;
+	double dMaxMCLKDivider;
+
+	DCapsDef *sCaps = &dev->usbDev.Caps;
+	HWDef    *hw    = &dev->usbDev.HwSetting;
+	u_char   *regs  = dev->usbDev.a_bRegs;
+
+	DBG( _DBG_INFO, "usb_GetMCLKDivider()\n" );
+
+	if( dev->transferRate == 2000000 ) {
+		int mclkdiv = usb_GetMCLKDiv(dev);
+		pParam->dMCLK = (double)mclkdiv/MCLKDIV_SCALING;
+	}
+
+	m_dMCLKDivider = pParam->dMCLK;
+
+	if (m_dHDPIDivider*m_dMCLKDivider >= 5.3/*6*/)
+		m_bIntTimeAdjust = 0;
+	else
+		m_bIntTimeAdjust = ceil( 5.3/*6.0*/ / (m_dHDPIDivider*m_dMCLKDivider));
+
+	if( pParam->bCalibration == PARAM_Scan ) {
+
+		usb_GetMCLKDiv(dev);
+
+		/*  Compare Integration with USB speed to find the best ITA value */
+		if( pParam->bBitDepth > 8 )	{
+
+			while( pParam->Size.dwPhyBytes >
+			       (m_dMCLKDivider * m_bCM * m_wLineLength / 6 * 9 / 10) *
+ 			       (1 + m_bIntTimeAdjust)) {
+				m_bIntTimeAdjust++;
+			}	
+
+			if( hw->motorModel == MODEL_HuaLien &&
+				sCaps->bCCD == kNEC3799 && m_bIntTimeAdjust > bMaxITA) {
+				m_bIntTimeAdjust = bMaxITA;
+			}
+
+			if(((hw->motorModel == MODEL_HP) && (sCaps->bCCD == kNECSLIM))/* ||
+			 	( regs[0x26] & _ONE_CH_COLOR )*/) {
+
+				bMaxITA = (u_char)floor((m_dMCLKDivider + 1) / 2.0);
+
+				DBG( _DBG_INFO2, "* MaxITA (HP) = %u\n", bMaxITA );
+				if( m_bIntTimeAdjust > bMaxITA ) {
+					DBG( _DBG_INFO, "* ITA (%u) limited\n", m_bIntTimeAdjust );
+					m_bIntTimeAdjust = bMaxITA;
+				}
+			}
+		}
+	}
+	DBG( _DBG_INFO2, "* Integration Time Adjust = %u (HDPI=%.3f,MCLKD=%.3f)\n",
+	                    m_bIntTimeAdjust, m_dHDPIDivider, m_dMCLKDivider );
+
+	regs[0x08] = (u_char)((m_dMCLKDivider - 1) * 2);
+	regs[0x19] = m_bIntTimeAdjust;
+
+	if( m_bIntTimeAdjust != 0 ) {
+
+		m_wStepSize = (u_short)((u_long) m_wStepSize *
+		                    (m_bIntTimeAdjust + 1) / m_bIntTimeAdjust);
+		if( m_wStepSize < 2 )
+			m_wStepSize = 2;
+
+		regs[0x46] = _HIBYTE(m_wStepSize);
+		regs[0x47] = _LOBYTE(m_wStepSize);
+
+		DBG( _DBG_INFO2, "* Stepsize = %u, 0x46=0x%02x 0x47=0x%02x\n",
+		                   m_wStepSize, regs[0x46], regs[0x47] );
+	    usb_GetDPD( dev );
+	}
+	
+	/* Compute maximum MCLK divider base on maximum integration time for
+	 * high lamp PWM, use equation 4
+	 */
+	dMaxIntegrationTime = hw->dIntegrationTimeHighLamp;
+	dMaxMCLKDivider = (double)CRYSTAL_FREQ * dMaxIntegrationTime /
+	                                    (1000 * 8 * m_bCM * m_wLineLength);
+
+	/* Determine lamp PWM setting */
+	if( m_dMCLKDivider > dMaxMCLKDivider ) {
+
+		DBG( _DBG_INFO2, "* Setting GreenPWMDutyCycleLow\n" );
+		regs[0x2a] = _HIBYTE( hw->wGreenPWMDutyCycleLow );
+		regs[0x2b] = _LOBYTE( hw->wGreenPWMDutyCycleLow );
+
+	} else {
+
+		DBG( _DBG_INFO2, "* Setting GreenPWMDutyCycleHigh\n" );
+		regs[0x2a] = _HIBYTE( hw->wGreenPWMDutyCycleHigh );
+		regs[0x2b] = _LOBYTE( hw->wGreenPWMDutyCycleHigh );
+	}
+
+	DBG( _DBG_INFO2, "* Current MCLK Divider = %f\n", m_dMCLKDivider );
+	return m_dMCLKDivider;
+}
+
+/** calculate the step size of each scan step
+ */
+static void
+usb_GetStepSize( Plustek_Device *dev, ScanParam *pParam )
+{
+	HWDef  *hw  = &dev->usbDev.HwSetting;
+	u_char *regs = dev->usbDev.a_bRegs;
+
+	/* Compute step size using equation 1 */
+	if (m_bIntTimeAdjust != 0) {
+		m_wStepSize = (u_short)(((u_long) pParam->PhyDpi.y * m_wLineLength *
+		              m_bLineRateColor * (m_bIntTimeAdjust + 1)) /
+		              (4 * hw->wMotorDpi * m_bIntTimeAdjust));
+	} else {
+		m_wStepSize = (u_short)(((u_long) pParam->PhyDpi.y * m_wLineLength *
+		               m_bLineRateColor) / (4 * hw->wMotorDpi));
+	}
+
+	if (m_wStepSize < 2)
+		m_wStepSize = 2;
+
+	m_wStepSize = m_wStepSize * 298 / 297;
+
+	regs[0x46] = _HIBYTE( m_wStepSize );
+	regs[0x47] = _LOBYTE( m_wStepSize );
+
+	DBG( _DBG_INFO2, "* Stepsize = %u, 0x46=0x%02x 0x47=0x%02x\n",
+	                  m_wStepSize, regs[0x46], regs[0x47] );
+}
+
+/**
+ */
+static void
+usb_GetLineLength( Plustek_Device *dev, ScanParam *param )
+{
+/* [note]
+ *  The ITA in this moment is always 0, it will be changed later when we
+ *  calculate MCLK. This is very strange why this routine will not call
+ *  again to get all new value after ITA was changed? If this routine
+ *  never call again, maybe we remove all factor with ITA here.
+ */
+	int tr;
+	int tpspd;  /* turbo/preview mode speed reg 0a b2..3                 */
+	int tpsel;  /* turbo/preview mode select reg 0a b0..1                */
+	int gbnd;   /* guardband duration reg 0e b4..7                       */
+	int dur;    /* pulse duration reg 0e b0..3                           */
+	int ntr;    /* number of tr pulses reg 0d b7                         */
+	int afeop;  /* scan mode, 0=pixel rate, 1=line rate,                 */
+	            /* 4=1 channel mode a, 5=1 channel mode b, reg 26 b0..2  */
+	int ctmode; /* CIS tr timing mode reg 19 b0..1                       */
+	int tp;     /* tpspd or 1 if tpsel=0                                 */
+	int b;      /* if ctmode=0, (ntr+1)*((2*gbnd)+dur+1), otherwise 1    */
+	int tradj;  /* ITA                                                   */
+	int en_tradj;
+	u_short      le;
+	HWDef       *hw    = &dev->usbDev.HwSetting;
+	ClkMotorDef *motor = usb_GetMotorSet( hw->motorModel );
+	u_char      *regs  = dev->usbDev.a_bRegs;
+
+	tpspd = (regs[0x0a] & 0x0c) >> 2;       /* turbo/preview mode speed  */
+	tpsel = regs[0x0a] & 3;                 /* turbo/preview mode select */
+
+	gbnd = (regs[0x0e] & 0xf0) >> 4;        /* TR fi1 guardband duration */
+	dur = (regs[0x0e] & 0xf);               /* TR pulse duration         */
+
+	ntr = regs[0x0d] / 128;                 /* number of tr pulses       */
+
+	afeop = regs[0x26] & 7;           /* afe op - 3 channel or 1 channel */
+
+	tradj = regs[0x19] & 0x7f;                /* integration time adjust */
+	en_tradj = (tradj) ? 1 : 0;
+
+	ctmode = (regs[0x0b] >> 3) & 3;                /* cis tr timing mode */
+
+	m_bLineRateColor = 1;	
+	if (afeop == 1 || afeop == 5) /* if 3 channel line or 1 channel mode b */
+		m_bLineRateColor = 3;
+
+	/* according to turbo/preview mode to set value */
+	if( tpsel == 0 ) {
+		tp = 1;
+	} else {
+		tp = tpspd + 2;
+		if( tp == 5 )
+			tp++;
+	}
+
+	b = 1;
+	if( ctmode == 0 ) { /* CCD mode scanner*/
+	
+		b  = (ntr + 1) * ((2 * gbnd) + dur + 1);
+		b += (1 - ntr) * en_tradj;
+	}
+	if( ctmode == 2 )   /* CIS mode scanner */
+	    b = 3;
+
+	/* it might be necessary to tweak this value, to keep the
+	 * MCLK constant - see some sheet-fed devices
+	 */
+	le = hw->wLineEnd;
+	if (motor->dpi_thresh != 0) {
+		if( param->PhyDpi.y <= motor->dpi_thresh) {
+			le = motor->lineend;
+			DBG( _DBG_INFO2, "* Adjusting lineend: %u\n", le);
+		}
+		regs[0x20] = _HIBYTE( le );
+		regs[0x21] = _LOBYTE( le );
+	}
+
+	tr = m_bLineRateColor * (le + tp * (b + 3 - ntr));
+
+	if( tradj == 0 ) {
+		if( ctmode == 0 )
+			tr += m_bLineRateColor;
+	} else {
+	
+		int le_phi, num_byteclk, num_mclkf, tr_fast_pix, extra_pix;
+			
+		/* Line color or gray mode */
+		if( afeop != 0 ) {
+		
+			le_phi      = (tradj + 1) / 2 + 1 + 6;
+			num_byteclk = ((le_phi + 8 * le + 8 * b + 4) /
+						   (8 * tradj)) + 1;
+			num_mclkf   = 8 * tradj * num_byteclk;
+			tr_fast_pix = num_byteclk;
+			extra_pix   = (num_mclkf - le_phi) % 8;
+		}
+		else /* 3 channel pixel rate color */
+		{
+			le_phi      = (tradj + 1) / 2 + 1 + 10 + 12;
+			num_byteclk = ((le_phi + 3 * 8 * le + 3 * 8 * b + 3 * 4) /
+						   (3 * 8 * tradj)) + 1;
+			num_mclkf   = 3 * 8 * tradj * num_byteclk;
+			tr_fast_pix = num_byteclk;
+			extra_pix   = (num_mclkf - le_phi) % (3 * 8);
+		}
+		
+		tr = b + le + 4 + tr_fast_pix;
+		if (extra_pix == 0)
+			tr++;
+		tr *= m_bLineRateColor;
+	}
+	m_wLineLength = tr / m_bLineRateColor;
+
+	DBG( _DBG_INFO2, "* LineLength=%d, LineRateColor=%u\n",
+	                    m_wLineLength, m_bLineRateColor );
+}
+
+/** usb_GetMotorParam
+ * registers 0x56, 0x57
+ */
+static void
+usb_GetMotorParam( Plustek_Device *dev, ScanParam *pParam )
+{
+	int          idx, i;
+	ClkMotorDef *clk;
+	MDef        *md;
+	DCapsDef    *sCaps = &dev->usbDev.Caps;
+	HWDef       *hw    = &dev->usbDev.HwSetting;
+	u_char      *regs  = dev->usbDev.a_bRegs;
+
+	if (!_IS_PLUSTEKMOTOR(hw->motorModel)) {
+
+		clk = usb_GetMotorSet( hw->motorModel );
+		md  = clk->motor_sets;
+		idx = 0;
+		for( i = 0; i < _MAX_CLK; i++ ) {
+			if( pParam->PhyDpi.y <= dpi_ranges[i] )
+				break;
+			idx++;
+		}
+		if( idx >= _MAX_CLK )
+			idx = _MAX_CLK - 1;
+
+		regs[0x56] = md[idx].pwm;
+		regs[0x57] = md[idx].pwm_duty;
+
+		regs[0x43] = 0;
+		regs[0x44] = 0;
+
+		if( md[idx].scan_lines_per_line > 1 ) {
+
+			if((pParam->bBitDepth > 8) &&
+				(pParam->bDataType == SCANDATATYPE_Color)) {
+
+				regs[0x43] = 0xff;
+				regs[0x44] = md[idx].scan_lines_per_line;
+
+				DBG( _DBG_INFO2, "* Line Skipping : 0x43=0x%02x, 0x44=0x%02x\n",
+				                  regs[0x43], regs[0x44] );
+			}
+		}
+	} else {
+
+		if( sCaps->OpticDpi.x == 1200 ) {
+
+			switch( hw->motorModel ) {
+
+			case MODEL_HuaLien:
+			case MODEL_KaoHsiung:
+			default:
+				if(pParam->PhyDpi.x <= 200)
+				{
+					regs[0x56] = 1;
+					regs[0x57] = 48;  /* 63; */
+				}
+				else if(pParam->PhyDpi.x <= 300)
+				{
+					regs[0x56] = 2;   /* 8;  */
+					regs[0x57] = 48;  /* 56; */
+				}
+				else if(pParam->PhyDpi.x <= 400)
+				{
+					regs[0x56] = 8;	
+					regs[0x57] = 48;	
+				}
+				else if(pParam->PhyDpi.x <= 600)
+				{
+					regs[0x56] = 2;   /* 10; */
+					regs[0x57] = 48;  /* 56; */
+				}
+				else /* pParam->PhyDpi.x == 1200) */
+				{
+					regs[0x56] = 1;   /* 8;  */
+					regs[0x57] = 48;  /* 56; */
+				}
+				break;
+        	}
+        } else {
+        	switch ( hw->motorModel ) {
+
+        	case MODEL_Tokyo600:
+        		regs[0x56] = 16;
+        		regs[0x57] = 4;	/* 2; */
+        		break;
+        	case MODEL_HuaLien:
+        		{
+        			if(pParam->PhyDpi.x <= 200)
+        			{
+        				regs[0x56] = 64;	/* 24; */
+        				regs[0x57] = 4;	/* 16; */
+        			}
+        			else if(pParam->PhyDpi.x <= 300)
+        			{
+        				regs[0x56] = 64;	/* 16; */
+        				regs[0x57] = 4;	/* 16; */
+        			}
+        			else if(pParam->PhyDpi.x <= 400)
+        			{
+        				regs[0x56] = 64;	/* 16; */
+        				regs[0x57] = 4;	/* 16; */
+        			}
+        			else /* if(pParam->PhyDpi.x <= 600) */
+        			{
+/* HEINER: check ADF stuff... */
+#if 0
+        				if(ScanInf.m_fADF)
+        				{
+        					regs[0x56] = 8;
+        					regs[0x57] = 48;
+        				}
+        				else
+#endif
+        				{
+        					regs[0x56] = 64;	/* 2;  */
+        					regs[0x57] = 4;	/* 48; */
+        				}
+        			}
+        		}
+        		break;
+        	case MODEL_KaoHsiung:
+        	default:
+        		if(pParam->PhyDpi.x <= 200)
+        		{
+        			regs[0x56] = 24;
+        			regs[0x57] = 16;
+        		}
+        		else if(pParam->PhyDpi.x <= 300)
+        		{
+        			regs[0x56] = 16;
+        			regs[0x57] = 16;
+        		}
+        		else if(pParam->PhyDpi.x <= 400)
+        		{
+        			regs[0x56] = 16;
+        			regs[0x57] = 16;
+        		}
+        		else /* if(pParam->PhyDpi.x <= 600) */
+        		{
+        			regs[0x56] = 2;
+        			regs[0x57] = 48;
+        		}
+        		break;
+        	}
+        }
+	}
+
+	DBG( _DBG_INFO2, "* MOTOR-Settings: PWM=0x%02x, PWM_DUTY=0x%02x\n",
+	                 regs[0x56], regs[0x57] );
+}
+
+/**
+ */
+static void
+usb_GetPauseLimit( Plustek_Device *dev, ScanParam *pParam )
+{
+	int     coeffsize, scaler;
+	HWDef  *hw   = &dev->usbDev.HwSetting;
+	u_char *regs = dev->usbDev.a_bRegs;
+
+	scaler = 1;
+	if( hw->bReg_0x26 & _ONE_CH_COLOR ) {
+		if( pParam->bDataType == SCANDATATYPE_Color ) {
+			scaler = 3;
+		}
+	}
+
+	/* compute size of coefficient ram */
+	coeffsize = 4 + 16 + 16;	/* gamma and shading and offset */
+
+	/* if 16 bit, then not all is used */
+	if( regs[0x09] & 0x20 ) {
+		coeffsize = 16 + 16;	/* no gamma */
+	}
+	coeffsize *= (2*3); /* 3 colors and 2 bytes/word */
+
+
+	/* Get available buffer size in KB
+	 * for 512kb this will be 296
+	 * for 2Mb   this will be 1832
+	 */
+	m_dwPauseLimit = (u_long)(hw->wDRAMSize - (u_long)(coeffsize));
+	m_dwPauseLimit -= ((pParam->Size.dwPhyBytes*scaler) / 1024 + 1);
+
+	/* If not reversing, take into account the steps to reverse */
+	if( regs[0x50] == 0 )
+		m_dwPauseLimit -= ((regs[0x54] & 7) *
+		                  (pParam->Size.dwPhyBytes * scaler) + 1023) / 1024;
+
+	DBG( _DBG_INFO2, "* PL=%lu, coeffsize=%u, scaler=%u\n",
+	                  m_dwPauseLimit, coeffsize, scaler );
+
+	m_dwPauseLimit = usb_max( usb_min(m_dwPauseLimit,
+	                  (u_long)ceil(pParam->Size.dwTotalBytes / 1024.0)), 2);
+
+	regs[0x4e] = (u_char)floor((m_dwPauseLimit*512.0)/(2.0*hw->wDRAMSize));
+
+	if( regs[0x4e] > 1 ) {
+		regs[0x4e]--;
+		if(regs[0x4e] > 1)
+			regs[0x4e]--;
+	} else
+		regs[0x4e] = 1;
+
+	/* resume, when buffer is 2/8 kbytes full (512k/2M memory)
+	 */
+	regs[0x4f] = 1;
+
+	DBG( _DBG_INFO2, "* PauseLimit = %lu, [0x4e] = 0x%02x, [0x4f] = 0x%02x\n",
+	                  m_dwPauseLimit, regs[0x4e], regs[0x4f] );
+}
+
+/** usb_GetScanLinesAndSize
+ */
+static void
+usb_GetScanLinesAndSize( Plustek_Device *dev, ScanParam *pParam )
+{
+	DCapsDef *sCaps = &dev->usbDev.Caps;
+
+	pParam->Size.dwPhyLines = (u_long)ceil((double) pParam->Size.dwLines *
+	                                     pParam->PhyDpi.y / pParam->UserDpi.y);
+
+	/* Calculate color offset */
+	if (pParam->bCalibration == PARAM_Scan && pParam->bChannels == 3) {
+
+		dev->scanning.bLineDistance = sCaps->bSensorDistance *
+		                                  pParam->PhyDpi.y / sCaps->OpticDpi.x;
+		pParam->Size.dwPhyLines += (dev->scanning.bLineDistance << 1);
+	}
+	else
+		dev->scanning.bLineDistance = 0;
+
+	pParam->Size.dwTotalBytes = pParam->Size.dwPhyBytes * pParam->Size.dwPhyLines;
+
+	DBG( _DBG_INFO, "* PhyBytes   = %lu\n", pParam->Size.dwPhyBytes );
+	DBG( _DBG_INFO, "* PhyLines   = %lu\n", pParam->Size.dwPhyLines );
+	DBG( _DBG_INFO, "* TotalBytes = %lu\n", pParam->Size.dwTotalBytes );
+}
+
+/** function to preset/reset the merlin registers
+ */
+static SANE_Bool
+usb_SetScanParameters( Plustek_Device *dev, ScanParam *pParam )
+{
+	static u_char reg8, reg38[6], reg48[2];
+
+	ScanDef   *scan    = &dev->scanning;
+	ScanParam *pdParam = &dev->scanning.sParam;
+	HWDef     *hw      = &dev->usbDev.HwSetting;
+	u_char    *regs    = dev->usbDev.a_bRegs;
+
+	m_pParam = pParam;
+
+	DBG( _DBG_INFO, "usb_SetScanParameters()\n" );
+
+	if( !usb_IsScannerReady(dev))
+		return SANE_FALSE;
+
+	if(pParam->bCalibration == PARAM_Scan && pParam->bSource == SOURCE_ADF) {
+/* HEINER: dSaveMoveSpeed is only used in func EjectPaper!!!
+		dSaveMoveSpeed = hw->dMaxMoveSpeed;
+*/
+		hw->dMaxMoveSpeed = 1.0;
+		usb_MotorSelect( dev, SANE_TRUE );
+		usb_MotorOn( dev, SANE_TRUE );
+	}
+
+	/*
+	 * calculate the basic settings...
+	 */
+	pParam->PhyDpi.x = usb_SetAsicDpiX( dev, pParam->UserDpi.x );
+	pParam->PhyDpi.y = usb_SetAsicDpiY( dev, pParam->UserDpi.y );
+
+	usb_SetColorAndBits( dev, pParam );
+	usb_GetScanRect    ( dev, pParam );
+
+	usb_PresetStepSize( dev, pParam );
+	
+	if( dev->caps.dwFlag & SFLAG_ADF ) {
+
+		if( pParam->bCalibration == PARAM_Scan ) {
+
+			if( pdParam->bSource == SOURCE_ADF ) {
+				regs[0x50] = 0;
+				regs[0x51] = 0x40;
+				if( pParam->PhyDpi.x <= 300)
+					regs[0x54] = (regs[0x54] & ~7) | 4;	/* 3; */
+				else
+					regs[0x54] = (regs[0x54] & ~7) | 5;	/* 4; */
+			} else {
+				regs[0x50] = hw->bStepsToReverse;
+				regs[0x51] = hw->bReg_0x51;
+				regs[0x54] &= ~7;
+			}
+		} else
+			regs[0x50] = 0;
+	} else {
+		if( pParam->bCalibration == PARAM_Scan )
+			regs[0x50] = hw->bStepsToReverse;
+		else
+			regs[0x50] = 0;
+	}
+
+	/* Assume we will not use ITA */
+	regs[0x19] = m_bIntTimeAdjust = 0;
+
+	/* Get variables from calculation algorithms */
+	if(!(pParam->bCalibration == PARAM_Scan &&
+          pParam->bSource == SOURCE_ADF && dev->usbDev.fLastScanIsAdf )) {
+
+		DBG( _DBG_INFO2, "* Scan calculations...\n" );
+		usb_GetLineLength ( dev, pParam );
+		usb_GetStepSize   ( dev, pParam );
+		usb_GetDPD        ( dev );
+		usb_GetMCLKDivider( dev, pParam );
+		usb_GetMotorParam ( dev, pParam );
+	}
+
+	/* Compute fast feed step size, use equation 3 and equation 8 */
+	if( m_dMCLKDivider < 1.0)
+		m_dMCLKDivider = 1.0;
+
+	m_wFastFeedStepSize = (u_short)(CRYSTAL_FREQ /
+	                          (m_dMCLKDivider * 8 * m_bCM * hw->dMaxMoveSpeed *
+	                           4 * hw->wMotorDpi));
+	/* CIS special ;-) */
+	if((hw->bReg_0x26 & _ONE_CH_COLOR) && (m_bCM == 1)) {
+		DBG( _DBG_INFO2, "* CIS FFStep-Speedup\n" );
+		m_wFastFeedStepSize /= 3;
+	}
+
+	if( m_bIntTimeAdjust != 0 )
+		m_wFastFeedStepSize /= m_bIntTimeAdjust;
+
+	if(regs[0x0a])
+		m_wFastFeedStepSize *= ((regs[0x0a] >> 2) + 2);
+	regs[0x48] = _HIBYTE( m_wFastFeedStepSize );
+	regs[0x49] = _LOBYTE( m_wFastFeedStepSize );
+
+	DBG( _DBG_INFO2, "* FFStepSize = %u, [0x48] = 0x%02x, [0x49] = 0x%02x\n",
+	                       m_wFastFeedStepSize, regs[0x48], regs[0x49] );
+
+	/* Compute the number of lines to scan using actual Y resolution */
+	usb_GetScanLinesAndSize( dev, pParam );
+	
+	/* Pause limit should be bounded by total bytes to read
+	 * so that the chassis will not move too far.
+	 */
+	usb_GetPauseLimit( dev, pParam );
+
+	/* For ADF .... */
+	if(pParam->bCalibration == PARAM_Scan && pParam->bSource == SOURCE_ADF) {
+
+		if( dev->usbDev.fLastScanIsAdf ) {
+
+			regs[0x08] = reg8;
+			memcpy( &regs[0x38], reg38, sizeof(reg38));
+			memcpy( &regs[0x48], reg48, sizeof(reg48));
+
+		} else {
+
+			reg8 = regs[0x08];
+			memcpy( reg38, &regs[0x38], sizeof(reg38));
+			memcpy( reg48, &regs[0x48], sizeof(reg48));
+		}
+		usb_MotorSelect( dev, SANE_TRUE );
+	}
+
+	/* Reset LM983x's state machine before setting register values */
+	if( !usbio_WriteReg( dev->fd, 0x18, 0x18 ))
+		return SANE_FALSE;
+
+	usleep(200 * 1000); /* Need to delay at least xxx microseconds */
+
+	if( !usbio_WriteReg( dev->fd, 0x07, 0x20 ))
+		return SANE_FALSE;
+
+	if( !usbio_WriteReg( dev->fd, 0x19, 6 ))
+		return SANE_FALSE;
+
+	regs[0x07] = 0;
+	regs[0x28] = 0;
+
+	/* set unused registers to 0 */
+	memset( &regs[0x03], 0, 3 );
+	memset( &regs[0x5f], 0, 0x7f-0x5f+1 );
+
+	if( !usb_IsSheetFedDevice(dev)) {
+		/* we limit the possible scansteps to avoid, that the sensors bumps
+		 * against the scanbed - not necessary for sheet-fed devices
+		 */
+		if(pParam->bCalibration==PARAM_Scan && pParam->bSource!=SOURCE_ADF) {
+
+			u_long  lines     = pParam->Size.dwPhyLines + scan->bLinesToSkip +
+			                                          scan->dwLinesDiscard + 5;
+			u_short scansteps = (u_short)ceil((double)lines*
+			                                 hw->wMotorDpi / pParam->PhyDpi.y);
+			DBG( _DBG_INFO, "* Scansteps=%u (%lu*%u/%u)\n", scansteps,  lines,
+			                hw->wMotorDpi, pParam->PhyDpi.y );
+			regs[0x4c] = _HIBYTE(scansteps);
+			regs[0x4d] = _LOBYTE(scansteps);
+		}
+	}
+
+	/* set the merlin registers */
+	_UIO(sanei_lm983x_write( dev->fd, 0x03, &regs[0x03], 3, SANE_TRUE));
+	_UIO(sanei_lm983x_write( dev->fd, 0x08, &regs[0x08], 0x7f - 0x08+1, SANE_TRUE));
+
+	usleep(100);
+	
+	if( !usbio_WriteReg( dev->fd, 0x07, 0 ))
+		return SANE_FALSE;
+
+	DBG( _DBG_INFO, "usb_SetScanParameters() done.\n" );
+	return SANE_TRUE;
+}
+
+/**
+ */
+static SANE_Bool
+usb_ScanBegin( Plustek_Device *dev, SANE_Bool auto_park )
+{
+	u_char  value;
+	u_short inches;
+	HWDef       *hw   = &dev->usbDev.HwSetting;
+	DCapsDef    *sc   = &dev->usbDev.Caps;
+	u_char      *regs = dev->usbDev.a_bRegs;
+
+	DBG( _DBG_INFO, "usb_ScanBegin()\n" );
+
+	if( !usb_Wait4ScanSample( dev ))
+		return SANE_FALSE;
+
+	/* save the request for usb_ScanEnd () */
+	m_fAutoPark = auto_park;
+
+	/* Disable home sensor during scan, or the chassis cannot move */
+	value = ((m_pParam->bCalibration == PARAM_Scan &&
+	        m_pParam->bSource == SOURCE_ADF)? (regs[0x58] & ~7): 0);
+
+	if(!usbio_WriteReg( dev->fd, 0x58, value ))
+		return SANE_FALSE;
+
+	/* Check if scanner is ready for receiving command */
+	if( !usb_IsScannerReady(dev))
+		return SANE_FALSE;
+
+	/* Flush cache - only LM9831 (Source: National Semiconductors) */
+	if( _LM9831 == hw->chip ) {
+
+		for(;;) {
+
+			if( SANE_TRUE == cancelRead ) {
+				DBG( _DBG_INFO, "ScanBegin() - Cancel detected...\n" );
+				return SANE_FALSE;
+			}
+			
+			_UIO(usbio_ReadReg( dev->fd, 0x01, &m_bOldScanData ));
+			if( m_bOldScanData ) {
+
+				u_long dwBytesToRead = m_bOldScanData * hw->wDRAMSize * 4;
+				u_char *pBuffer      = malloc( sizeof(u_char) * dwBytesToRead );
+
+				DBG(_DBG_INFO,"Flushing cache - %lu bytes (bOldScanData=%u)\n",
+				                                dwBytesToRead, m_bOldScanData );
+
+				_UIO(sanei_lm983x_read( dev->fd, 0x00, pBuffer, 
+				                                  dwBytesToRead, SANE_FALSE ));
+				free( pBuffer );
+
+			} else
+				break;
+		}
+	}
+
+	/* Download map & Shading data */
+	if(( m_pParam->bCalibration == PARAM_Scan && !usb_MapDownload( dev )) ||
+	    !usb_DownloadShadingData( dev, m_pParam->bCalibration )) {
+		return SANE_FALSE;
+	}
+
+	/* Move chassis and start to read image data */
+	if (!usbio_WriteReg( dev->fd, 0x07, 3 ))
+		return SANE_FALSE;
+
+	usbio_ReadReg( dev->fd, 0x01, &m_bOldScanData );
+	m_bOldScanData = 0;                     /* No data at all  */
+
+	m_fStart = m_fFirst = SANE_TRUE;        /* Prepare to read */
+
+	DBG( _DBG_DREGS, "Register Dump before reading data:\n" );
+	dumpregs( dev->fd, NULL );
+
+	inches = (u_short)((m_pParam->Origin.y *300UL)/hw->wMotorDpi);
+	DBG( _DBG_INFO2, ">>> INCH=%u, DOY=%u\n", inches, sc->Normal.DataOrigin.y );
+	if( inches > sc->Normal.DataOrigin.y )
+		usb_WaitPos( dev, 150, SANE_FALSE );
+
+	DBG( _DBG_INFO, "usb_ScanBegin() done.\n" );
+	return SANE_TRUE;
+}
+
+/** usb_ScanEnd
+ * stop all the processing stuff and reposition sensor back home
+ */
+static SANE_Bool
+usb_ScanEnd( Plustek_Device *dev )
+{
+	u_char value;
+
+	DBG( _DBG_INFO, "usbDev_ScanEnd(), start=%u, park=%u\n",
+	                                                   m_fStart, m_fAutoPark );
+	usbio_ReadReg( dev->fd, 0x07, &value );
+	if( value == 3 || value != 2 )
+		usbio_WriteReg( dev->fd, 0x07, 0 );
+
+	if( m_fStart ) {
+		m_fStart = SANE_FALSE;
+
+		if( m_fAutoPark )
+			usb_ModuleToHome( dev, SANE_FALSE );
+	}
+	else if( SANE_TRUE == cancelRead ) {
+	
+		usb_ModuleToHome( dev, SANE_FALSE );
+	}
+	return SANE_TRUE;
+}
+
+/**
+ */
+static SANE_Bool
+usb_IsDataAvailableInDRAM( Plustek_Device *dev )
+{
+	/* Compute polling timeout
+	 *	Height (Inches) / MaxScanSpeed (Inches/Second) = Seconds to move the
+     *  module from top to bottom. Then convert the seconds to miliseconds
+     *  by multiply 1000. We add extra 2 seconds to get some tolerance.
+     */
+	u_char         a_bBand[3];
+	long           dwTicks;
+    struct timeval t;
+	u_char         *regs = dev->usbDev.a_bRegs;
+
+	DBG( _DBG_INFO, "usb_IsDataAvailableInDRAM()\n" );
+
+	gettimeofday( &t, NULL);	
+	dwTicks = t.tv_sec + 30;
+
+	for(;;)	{
+
+		_UIO( sanei_lm983x_read( dev->fd, 0x01, a_bBand, 3, SANE_FALSE ));
+
+		gettimeofday( &t, NULL);	
+	    if( t.tv_sec > dwTicks )
+			break;
+
+		if( usb_IsEscPressed()) {
+			DBG(_DBG_INFO,"usb_IsDataAvailableInDRAM() - Cancel detected...\n");
+			return SANE_FALSE;
+		}
+			
+		/* It is not stable for read */
+		if((a_bBand[0] != a_bBand[1]) && (a_bBand[1] != a_bBand[2]))
+			continue;
+
+		if( a_bBand[0] > m_bOldScanData ) {
+
+			if( m_pParam->bSource != SOURCE_Reflection )
+
+				usleep(1000*(30 * regs[0x08] * dev->usbDev.Caps.OpticDpi.x / 600));
+			else
+				usleep(1000*(20 * regs[0x08] * dev->usbDev.Caps.OpticDpi.x / 600));
+
+			DBG( _DBG_INFO, "Data is available\n" );
+			return SANE_TRUE;
+		}
+	}
+
+	DBG( _DBG_INFO, "NO Data available\n" );
+	return SANE_FALSE;
+}
+
+/**
+ */
+static SANE_Bool
+usb_ScanReadImage( Plustek_Device *dev, void *pBuf, u_long dwSize )
+{
+	u_char       *regs = dev->usbDev.a_bRegs;
+	SANE_Status   res;
+
+	DBG( _DBG_READ, "usb_ScanReadImage(%lu)\n", dwSize );
+
+	if( m_fFirst ) {
+
+		m_fFirst = SANE_FALSE;
+
+		/* Wait for data band ready */
+		if (!usb_IsDataAvailableInDRAM( dev )) {
+			DBG( _DBG_ERROR, "Nothing to read...\n" );
+			return SANE_FALSE;
+		}
+
+		/* restore the fast forward stepsize...*/
+		sanei_lm983x_write(dev->fd, 0x48, &regs[0x48], 2, SANE_TRUE);
+	}
+	res = sanei_lm983x_read(dev->fd, 0x00, (u_char *)pBuf, dwSize, SANE_FALSE);
+
+	/* check for pressed ESC button, as sanei_lm983x_read() may take some time
+	 */
+	if( usb_IsEscPressed()) {
+		DBG(_DBG_INFO,"usb_ScanReadImage() - Cancel detected...\n");
+		return SANE_FALSE;
+	}
+
+	DBG( _DBG_READ, "usb_ScanReadImage() done, result: %d\n", res );
+	if( SANE_STATUS_GOOD == res ) {
+		return SANE_TRUE;
+	}
+
+	DBG( _DBG_ERROR, "usb_ScanReadImage() failed\n" );
+	return SANE_FALSE;
+}
+
+/** calculate the number of pixels per line and lines out of a given
+ * crop-area. The size of the area is given on a 300dpi base!
+ */
+static void
+usb_GetImageInfo( Plustek_Device *dev, ImgDef *pInfo, WinInfo *pSize )
+{
+	DBG( _DBG_INFO, "usb_GetImageInfo()\n" );
+
+	pSize->dwPixels = (u_long)pInfo->crArea.cx * pInfo->xyDpi.x / 300UL;
+	pSize->dwLines  = (u_long)pInfo->crArea.cy * pInfo->xyDpi.y / 300UL;
+
+	DBG( _DBG_INFO2,"Area: cx=%u, cy=%u\n",pInfo->crArea.cx,pInfo->crArea.cy);
+
+	switch( pInfo->wDataType ) {
+
+		case COLOR_TRUE48:
+			pSize->dwBytes = pSize->dwPixels * 6UL;
+			break;
+			
+		case COLOR_TRUE24:
+			if( dev->scanning.fGrayFromColor > 7 ){
+				pSize->dwBytes  = (pSize->dwPixels + 7UL) >> 3;
+				pSize->dwPixels = pSize->dwBytes * 8;
+			} else {
+				pSize->dwBytes = pSize->dwPixels * 3UL;
+			}
+			break;
+
+		case COLOR_GRAY16:
+			pSize->dwBytes = pSize->dwPixels << 1;
+			break;
+
+		case COLOR_256GRAY:
+			pSize->dwBytes = pSize->dwPixels;
+			break;
+
+		default:
+			pSize->dwBytes  = (pSize->dwPixels + 7UL) >> 3;
+			pSize->dwPixels = pSize->dwBytes * 8;
+			break;
+	}
+}
+
+/**
+ */
+static void
+usb_SaveImageInfo( Plustek_Device *dev, ImgDef *pInfo )
+{
+	HWDef     *hw     = &dev->usbDev.HwSetting;
+	ScanParam *pParam = &dev->scanning.sParam;
+
+	DBG( _DBG_INFO, "usb_SaveImageInfo()\n" );
+
+	/* Dpi & Origins */
+	pParam->UserDpi  = pInfo->xyDpi;
+	pParam->Origin.x = pInfo->crArea.x;
+	pParam->Origin.y = pInfo->crArea.y;
+
+	/* Source & Bits */
+	pParam->bBitDepth = 8;
+
+	switch( pInfo->wDataType ) {
+
+		case COLOR_TRUE48:
+			pParam->bBitDepth = 16;
+			/* fall through... */
+			
+		case COLOR_TRUE24:
+			pParam->bDataType = SCANDATATYPE_Color;
+
+			/* AFE operation: one or 3 channels ! */
+			if( hw->bReg_0x26 & _ONE_CH_COLOR )
+				pParam->bChannels = 1;
+			else
+				pParam->bChannels = 3;
+			break;
+
+		case COLOR_GRAY16:
+			pParam->bBitDepth = 16;
+			/* fall through... */
+
+		case COLOR_256GRAY:
+			pParam->bDataType = SCANDATATYPE_Gray;
+			pParam->bChannels = 1;
+			break;
+
+		default:
+			pParam->bBitDepth = 1;
+			pParam->bDataType = SCANDATATYPE_BW;
+			pParam->bChannels = 1;
+	}
+
+	DBG( _DBG_INFO, "* dwFlag = 0x%08lx\n", pInfo->dwFlag );
+
+	if( pInfo->dwFlag & SCANDEF_Transparency )
+		pParam->bSource = SOURCE_Transparency;
+	else if( pInfo->dwFlag & SCANDEF_Negative )
+		pParam->bSource = SOURCE_Negative;
+	else if( pInfo->dwFlag & SCANDEF_Adf )
+		pParam->bSource = SOURCE_ADF;
+	else
+		pParam->bSource = SOURCE_Reflection;
+
+	/* it seems, that we need to adjust the Origin.x when we have a
+	 * sheetfed device to avoid stripes in the resulting pictures
+	 */
+	if( usb_IsSheetFedDevice(dev)) {
+	
+		int step, div, org, xdpi;
+
+		xdpi = usb_SetAsicDpiX( dev, pParam->UserDpi.x );
+
+		if ((xdpi * 2) <= 300)
+			div = 300;
+		else if ((xdpi * 2) <= 600)
+			div = 600;
+		else if ((xdpi * 2) <= 1200)
+			div = 1200;
+		else
+			div = 2400;
+
+		step = div / xdpi;
+		org  = pParam->Origin.x;
+
+		pParam->Origin.x = (pParam->Origin.x / step) * step;
+
+		if (org != pParam->Origin.x)
+			DBG(_DBG_INFO, "* Origin.x adjusted: %i -> %i\n",
+			               org, pParam->Origin.x);
+	}
+}
+
+/* END PLUSTEK-USBSCAN.C ....................................................*/