Initial import of sane-backends version 1.0.24-1.2

1 files changed, 2180 insertions, 0 deletions

diff --git a/backend/stv680.c b/backend/stv680.c
new file mode 100644
index 0000000..15a8472
--- /dev/null
+++ b/backend/stv680.c
@@ -0,0 +1,2180 @@
+/* sane - Scanner Access Now Easy.
+
+   Copyright (C) 2004 - 2006 Gerard Klaver  <gerard at gkall dot hobby dot nl>
+
+   The teco2 and gl646 backend (Frank Zago) are used as a template for 
+   this backend.
+
+   For the usb commands and bayer decoding parts of the following 
+   program are used:
+   The pencam2 program  (GNU GPL license 2)
+
+   For the usb commands parts of the following programs are used:
+   The libgphoto2 (camlib stv0680)   (GNU GPL license 2)
+   The stv680.c/.h kernel module   (GNU GPL license 2)
+
+   For the stv680_add_text routine the add_text routine and font_6x11.h file 
+   are taken from the webcam.c file, part of xawtv program,
+   (c) 1998-2002 Gerd Knorr (GNU GPL license 2).
+
+   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.
+   ------------------------------------------------------------------
+*/
+
+/*  $Id$
+
+   stv680 vidcam  driver Gerard Klaver
+*/
+
+/*SANE FLOW DIAGRAM
+
+   - sane_init() : initialize backend, attach vidcams
+   . - sane_get_devices() : query list of vidcam devices
+   . - sane_open() : open a particular vidcam device
+   . . - sane_set_io_mode : set blocking mode
+   . . - sane_get_select_fd : get vidcam fd
+   . . - sane_get_option_descriptor() : get option information
+   . . - sane_control_option() : change option values
+   . .
+   . . - sane_start() : start image acquisition
+   . .   - sane_get_parameters() : returns actual scan parameters
+   . .   - sane_read() : read image data (from pipe)
+   . .     (sane_read called multiple times; 
+   . .      after sane_read returns EOF)
+   . .     go back to sane_start() if more frames desired
+   . . - sane_cancel() : cancel operation
+   . - sane_close() : close opened vidcam device
+   - sane_exit() : terminate use of backend
+*/
+/*--------------------------------------------------------------------------*/
+
+#define BUILD 1			/* 2004/09/09  update 20-04-2006 */
+#define BACKEND_NAME stv680
+#define STV680_CONFIG_FILE "stv680.conf"
+
+/* --------------------- SANE INTERNATIONALISATION ------------------------ */
+
+/* must be first include */
+#include "../include/sane/config.h"
+
+#include <errno.h>
+#include <fcntl.h>
+#include <limits.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <unistd.h>
+
+#include "../include/sane/sane.h"
+#include "../include/sane/sanei.h"
+#include "../include/sane/saneopts.h"
+#include "../include/sane/sanei_usb.h"
+#include "../include/sane/sanei_debug.h"
+#include "../include/sane/sanei_backend.h"
+#include "../include/sane/sanei_config.h"
+#include "../include/lassert.h"
+
+/* for add-text routine  */
+#include <time.h>
+#include "../include/font_6x11.h"
+/*-----------------------*/
+
+#include "stv680.h"
+
+#define TIMEOUT 1000
+
+/*--------------------------------------------------------------------------*/
+/* Lists of possible scan modes. */
+static SANE_String_Const scan_mode_list[] = {
+  COLOR_RGB_STR,
+  COLOR_RGB_TEXT_STR,
+  SANE_VALUE_SCAN_MODE_COLOR,
+  COLOR_RAW_STR,
+
+  NULL
+};
+
+/*-----------------------------------------minium, maximum, quantization----*/
+static const SANE_Range brightness_range = { -128, 128, 1 };
+
+static const SANE_Range red_level_range = { -32, 32, 1 };
+
+static const SANE_Range green_level_range = { -32, 32, 1 };
+
+static const SANE_Range blue_level_range = { -32, 32, 1 };
+
+/*--------------------------------------------------------------------------*/
+
+static const struct dpi_color_adjust stv680_dpi_color_adjust[] = {
+
+  /*dpi, y, x, color sequence R G or B */
+  {176, 144, 0, 1, 2},		/* QCIF  selected by dev->CIF  */
+  {352, 288, 0, 1, 2},		/* CIF            ,,           */
+  {160, 120, 0, 1, 2},		/* QSIF           ,, dev->VGA  */
+  {320, 240, 0, 1, 2},		/* QVGA (SIF)     ,,           */
+  {640, 480, 0, 1, 2},		/* VGA            ,,           */
+  /* must be the last entry */
+  {0, 0, 0, 0, 0}
+};
+
+static const struct vidcam_hardware vidcams[] = {
+
+  {0x0553, 0x0202, USB_CLASS_VENDOR_SPEC,
+   "AIPTEK", "PENCAM STV0680",
+   stv680_dpi_color_adjust},
+
+  {0x04c8, 0x0722, USB_CLASS_VENDOR_SPEC,
+   "Konica", "e-mini",
+   stv680_dpi_color_adjust},
+
+  {0x1183, 0x0001, USB_CLASS_VENDOR_SPEC,
+   "DigitalDream", "l'espion XS",
+   stv680_dpi_color_adjust},
+
+  {0x041e, 0x4007, USB_CLASS_VENDOR_SPEC,
+   "Creative", "WebCam Go mini",
+   stv680_dpi_color_adjust}
+};
+
+/* List of vidcams attached. */
+static Stv680_Vidcam *first_dev = NULL;
+static int num_devices = 0;
+/* used by sane_get_devices */
+static const SANE_Device **devlist = NULL;
+
+/*----------------------------------------------------------- */
+
+/* Local functions. */
+
+/* Display a buffer in the log. Display by lines of 16 bytes. */
+static void
+hexdump (int level, const char *comment, unsigned char *buf, const int length)
+{
+  int i;
+  char line[128];
+  char *ptr;
+  char asc_buf[17];
+  char *asc_ptr;
+
+  DBG (level, "  %s\n", comment);
+
+  i = 0;
+  goto start;
+
+  do
+    {
+      if (i < length)
+	{
+	  ptr += sprintf (ptr, " %2.2x", *buf);
+
+	  if (*buf >= 32 && *buf <= 127)
+	    {
+	      asc_ptr += sprintf (asc_ptr, "%c", *buf);
+	    }
+	  else
+	    {
+	      asc_ptr += sprintf (asc_ptr, ".");
+	    }
+	}
+      else
+	{
+	  /* After the length; do nothing. */
+	  ptr += sprintf (ptr, "   ");
+	}
+
+      i++;
+      buf++;
+
+      if ((i % 16) == 0)
+	{
+	  /* It's a new line */
+	  DBG (level, "  %s    %s\n", line, asc_buf);
+
+	start:
+	  ptr = line;
+	  *ptr = '\0';
+	  asc_ptr = asc_buf;
+	  *asc_ptr = '\0';
+
+	  ptr += sprintf (ptr, "  %3.3d:", i);
+	}
+    }
+  while (i < ((length + 15) & ~15));
+}
+
+/* Returns the length of the longest string, including the terminating
+ * character. */
+static size_t
+max_string_size (SANE_String_Const strings[])
+{
+  size_t size, max_size = 0;
+  int i;
+
+  for (i = 0; strings[i]; ++i)
+    {
+      size = strlen (strings[i]) + 1;
+      if (size > max_size)
+	{
+	  max_size = size;
+	}
+    }
+  return max_size;
+}
+
+/* Initialize a vidcam entry. Return an allocated vidcam with some
+ *  */
+static Stv680_Vidcam *
+stv680_init (void)
+{
+  Stv680_Vidcam *dev;
+
+  DBG (DBG_proc, "stv680_init: enter\n");
+
+  /* Allocate a new vidcam entry. */
+  dev = malloc (sizeof (Stv680_Vidcam));
+  if (dev == NULL)
+    {
+      return NULL;
+    }
+  memset (dev, 0, sizeof (Stv680_Vidcam));
+
+/* Allocate the windoww buffer*/
+  dev->windoww_size = 0x20;
+  dev->windoww = malloc (dev->windoww_size);
+  if (dev->windoww == NULL)
+    {
+      free (dev);
+      return NULL;
+    }
+
+/* Allocate the windowr buffer*/
+  dev->windowr_size = 0x20;
+  dev->windowr = malloc (dev->windowr_size);
+  if (dev->windowr == NULL)
+    {
+      free (dev->windoww);
+      free (dev);
+      return NULL;
+    }
+
+  dev->fd = -1;
+
+  DBG (DBG_proc, "stv680_init: exit\n");
+
+  return (dev);
+}
+
+static SANE_Status
+stv680_init_2 (Stv680_Vidcam * dev)
+{
+  SANE_Status status;
+
+  DBG (DBG_proc, "stv680_init_2: enter\n");
+
+  /* Allocate the buffer used to transfer the USB data */
+  /* Check for max. format image size so buffer size can
+   * be adjusted, format from camera is bayer 422 */
+  if (dev->CIF)
+    dev->buffer_size = 356 * 292;
+  if (dev->VGA)
+    dev->buffer_size = 644 * 484;
+  DBG (DBG_proc, "stv680_init_2: dev->bufffer = 0x%lx\n", (unsigned long) (size_t) dev->buffer_size);
+
+  dev->buffer = malloc (dev->buffer_size);
+
+  if (dev->buffer == NULL)
+    {
+      free (dev->windowr);
+      free (dev->windoww);
+      free (dev);
+      return SANE_STATUS_NO_MEM;
+    }
+
+  /* Allocate the output buffer used for bayer conversion */
+  dev->output_size = dev->buffer_size * 3;
+
+  dev->output = malloc (dev->output_size);
+  if (dev->output == NULL)
+    {
+      free (dev->windowr);
+      free (dev->windoww);
+      free (dev->buffer);
+      free (dev);
+
+      return SANE_STATUS_NO_MEM;
+    }
+  dev->image_size = dev->buffer_size;
+
+  dev->image = malloc (dev->image_size);
+  if (dev->image == NULL)
+    {
+      free (dev->windowr);
+      free (dev->windoww);
+      free (dev->buffer);
+      free (dev->output);
+      free (dev);
+
+      return SANE_STATUS_NO_MEM;
+    }
+
+  DBG (DBG_proc, "stv680_init_2: exit\n");
+  status = SANE_STATUS_GOOD;
+  return status;
+}
+
+/* Closes an open vidcams. */
+static void
+stv680_close (Stv680_Vidcam * dev)
+{
+  DBG (DBG_proc, "stv680_close: enter \n");
+
+  if (dev->fd != -1)
+    {
+
+      DBG (DBG_proc, "stv680_close: fd !=-1 \n");
+      sanei_usb_close (dev->fd);
+      dev->fd = -1;
+    }
+
+  DBG (DBG_proc, "stv680_close: exit\n");
+}
+
+/* Frees the memory used by a vidcam. */
+static void
+stv680_free (Stv680_Vidcam * dev)
+{
+  int i;
+
+  DBG (DBG_proc, "stv680_free: enter\n");
+
+  if (dev == NULL)
+    return;
+
+  stv680_close (dev);
+  if (dev->devicename)
+    {
+      free (dev->devicename);
+    }
+  if (dev->buffer)
+    {
+      free (dev->buffer);
+    }
+  if (dev->output)
+    {
+      free (dev->output);
+    }
+  if (dev->image)
+    {
+      free (dev->image);
+    }
+  if (dev->windoww)
+    {
+      free (dev->windoww);
+    }
+  if (dev->windowr)
+    {
+      free (dev->windowr);
+    }
+  for (i = 1; i < OPT_NUM_OPTIONS; i++)
+    {
+      if (dev->opt[i].type == SANE_TYPE_STRING && dev->val[i].s)
+	{
+	  free (dev->val[i].s);
+	}
+    }
+  if (dev->resolutions_list)
+    free (dev->resolutions_list);
+
+  free (dev);
+
+  DBG (DBG_proc, "stv680_free: exit\n");
+}
+
+static SANE_Status
+stv680_set_config (Stv680_Vidcam * dev, int configuration, int interface,
+		   int alternate)
+{
+  SANE_Status status;
+  DBG (DBG_proc, "stv680_set_config: open\n");
+/* seems a problem on some systems (Debian amd64 unstable 19042006)
+ * not calling usb_set_configuration seems to help reason ?
+  status = sanei_usb_set_configuration (dev->fd, configuration);
+  if (status != SANE_STATUS_GOOD)
+    {
+      DBG (DBG_error,
+	   "stv680_set_config: STV680 FAILED to set configuration %d\n",
+	   configuration);
+      return status;
+    }
+*/
+  status = sanei_usb_claim_interface (dev->fd, interface);
+  if (status != SANE_STATUS_GOOD)
+    {
+      DBG (DBG_error,
+	   "stv680_set_config: STV0680 FAILED to claim interface\n");
+      return status;
+    }
+
+  status = sanei_usb_set_altinterface (dev->fd, alternate);
+  if (status != SANE_STATUS_GOOD)
+    {
+      DBG (DBG_error,
+	   "stv680_set_config: STV0680 FAILED to set alternate interface %d\n",
+	   alternate);
+      return status;
+    }
+  DBG (DBG_proc,
+       "stv680_set_config: configuration=%d, interface=%d, alternate=%d\n",
+       configuration, interface, alternate);
+
+  DBG (DBG_proc, "stv680_set_config: exit\n");
+  return status;
+}
+
+/* Reset vidcam */
+static SANE_Status
+stv680_reset_vidcam (Stv680_Vidcam * dev)
+{
+  SANE_Status status;
+  size_t sizew;			/* significant size of window */
+  size_t sizer;
+
+  DBG (DBG_proc, "stv680_reset_vidcam: enter\n");
+
+  sizew = dev->windoww_size;
+  sizer = dev->windowr_size;
+
+  memset (dev->windoww, 0, sizew);
+  memset (dev->windowr, 0, sizer);
+
+  sizew = 0x00;			/* was 0 ? */
+  status =
+    sanei_usb_control_msg (dev->fd, 0x41, 0x0a, 0x0000, 0, sizew,
+			   dev->windoww);
+  if (status != SANE_STATUS_GOOD)
+    {
+      return status;
+    }
+  DBG (DBG_proc, "stv680_reset_vidcam: CMDID_STOP_VIDEO end\n");
+
+  /* this is a high priority command; it stops all lower order commands */
+
+  sizew = 0x00;			/* was 0 */
+  status =
+    sanei_usb_control_msg (dev->fd, 0x41, 0x04, 0x0000, 0, sizew,
+			   dev->windoww);
+  if (status != SANE_STATUS_GOOD)
+    {
+      return status;
+    }
+  DBG (DBG_proc, "stv680_reset_vidcam: CMDID_CANCEL_TRANSACTION end\n");
+  sizer = 0x02;
+  DBG (DBG_proc, "stv680_reset_vidcam: CMDID_GET_LAST_ERROR begin\n");
+  status =
+    sanei_usb_control_msg (dev->fd, 0xc1, 0x80, 0x0000, 0, sizer,
+			   dev->windowr);
+  if (status != SANE_STATUS_GOOD)
+    {
+      /* Get Last Error; 2 = busy */
+      DBG (DBG_proc,
+	   "stv680_reset_vidcam: last error: %i, command = 0x%x\n",
+	   dev->windowr[0], dev->windowr[1]);
+      return status;
+    }
+  else
+    {
+      DBG (DBG_proc, "stv680_reset_vidcam: Camera reset to idle mode.\n");
+    }
+  hexdump (DBG_info2, "stv680_reset_vidcam: CMDID_GET_LAST_ERROR",
+	   dev->windowr, sizer);
+
+  /*  configuration = 1, interface = 0, alternate = 0 */
+  /*
+  status = stv680_set_config (dev, 1, 0, 0);
+  if (status != SANE_STATUS_GOOD)
+    {
+      DBG (DBG_error,
+	   "stv680_reset_vidcam: STV680 FAILED to set configure\n");
+      return status;
+    }
+    */
+  status = SANE_STATUS_GOOD;
+  DBG (DBG_proc, "stv680_reset_vidcam: exit\n");
+
+  return status;
+}
+
+/* Inquiry a device and returns TRUE if is supported. */
+static int
+stv680_identify_vidcam (Stv680_Vidcam * dev)
+{
+  SANE_Status status;
+  SANE_Word vendor;
+  SANE_Word product;
+  int i;
+  size_t sizer;
+
+  DBG (DBG_info, "stv680_identify_vidcam: open\n");
+
+  status = sanei_usb_get_vendor_product (dev->fd, &vendor, &product);
+
+  /* Loop through our list to make sure this scanner is supported. */
+  for (i = 0; i < NELEMS (vidcams); i++)
+    {
+      if (vidcams[i].vendor == vendor && vidcams[i].product == product)
+	{
+
+	  DBG (DBG_info, "stv680_identify_vidcam: vidcam %x:%x is in list\n",
+	       vendor, product);
+
+	  dev->hw = &(vidcams[i]);
+
+	  sizer = dev->windowr_size;
+	  memset (dev->windowr, 0, sizer);
+
+	  /*  configuration = 1, interface = 0, alternate = 0 */
+	  /*
+	  status = stv680_set_config (dev, 1, 0, 0);
+	  if (status != SANE_STATUS_GOOD)
+	    {
+	      DBG (DBG_error,
+		   "stv680_vidcam_init: STV680 FAILED to set configure\n");
+	      return status;
+	    }
+          */  
+	  sizer = 0x02;
+	  status =
+	    sanei_usb_control_msg (dev->fd, 0xc1, 0x88, 0x5678, 0, sizer,
+				   dev->windowr);
+	  if (status != SANE_STATUS_GOOD)
+	    {
+	      DBG (DBG_error,
+		   "stv680_identify_vidcam: this is not a STV680 (idVendor = %d, bProduct = %d) writing register failed with %s\n",
+		   vendor, product, sane_strstatus (status));
+	      return SANE_FALSE;
+	    }
+	  if ((dev->windowr[0] != 0x56) || (dev->windowr[1] != 0x78))
+	    {
+	      DBG (DBG_proc,
+		   "STV(e): camera ping failed!!, checkvalue !=0x5678\n");
+	      sizer = 0x02;
+	      hexdump (DBG_info2, "urb12 window", dev->windowr, sizer);
+	      return SANE_FALSE;
+	    }
+	  sizer = 0x02;
+	  hexdump (DBG_info2, "urb12 ping data", dev->windowr, sizer);
+
+	  sizer = 0x10;
+	  status =
+	    sanei_usb_control_msg (dev->fd, 0xc1, 0x85, 0x0000, 0, sizer,
+				   dev->windowr);
+	  if (status != SANE_STATUS_GOOD)
+	    return SANE_FALSE;
+
+	  hexdump (DBG_info2, "urbxx CMDID_GET_CAMERA_INFO", dev->windowr,
+		   sizer);
+
+	  dev->SupportedModes = dev->windowr[7];
+	  i = dev->SupportedModes;
+	  dev->QSIF = 0;
+	  dev->CIF = 0;
+	  dev->QCIF = 0;
+	  dev->VGA = 0;
+	  dev->QVGA = 0;
+	  if (i & 1)
+	    dev->CIF = 1;
+	  if (i & 2)
+	    dev->VGA = 1;
+	  if (i & 8)
+	    dev->QVGA = 1;
+	  if (i & 4)
+	    dev->QCIF = 1;
+	  dev->QSIF = dev->QVGA;	/* for software subsample */
+	  if (dev->SupportedModes == 0)
+	    {
+	      DBG (DBG_proc,
+		   "STV(e): There are NO supported STV680 modes!!\n");
+	      i = -1;
+	      return SANE_FALSE;
+	    }
+	  else
+	    {
+	      if (dev->VGA)
+		DBG (DBG_proc, "STV(i): VGA is supported\n");
+	      if (dev->CIF)
+		DBG (DBG_proc, "STV(i): CIF is supported\n");
+	      if (dev->QVGA)
+		DBG (DBG_proc, "STV(i): QVGA is supported\n");
+	      if (dev->QCIF)
+		DBG (DBG_proc, "STV(i): QCIF is supported\n");
+	    }
+
+	  /* FW rev, ASIC rev, sensor ID  */
+	  DBG (DBG_proc, "STV(i): Firmware rev is %i.%i\n", dev->windowr[0],
+	       dev->windowr[1]);
+	  DBG (DBG_proc, "STV(i): ASIC rev is %i.%i\n", dev->windowr[2],
+	       dev->windowr[3]);
+	  DBG (DBG_proc, "STV(i): Sensor ID is %i.%i\n", (dev->windowr[4]),
+	       (dev->windowr[5]));
+	  /* Hardware config  */
+	  dev->HardwareConfig = dev->windowr[6];
+	  i = dev->HardwareConfig;
+	  /* Comms link, Flicker freq, Mem size */
+	  if (i & 1)
+	    DBG (DBG_proc, "STV(i): Comms link is serial\n");
+	  else
+	    DBG (DBG_proc, "STV(i): Comms link is USB\n");
+	  if (i & 2)
+	    DBG (DBG_proc, "STV(i): Flicker freq = 60 Hz\n");
+	  else
+	    DBG (DBG_proc, "STV(i): Flicker freq = 50 Hz\n");
+	  if (i & 4)
+	    DBG (DBG_proc, "STV(i): Mem size = 16Mbit\n");
+	  else
+	    DBG (DBG_proc, "STV(i): Mem size = 64Mbit\n");
+	  if (i & 8)
+	    DBG (DBG_proc, "STV(i): Thumbnails supported\n");
+	  else
+	    DBG (DBG_proc, "STV(i): Thumbnails N/A\n");
+	  if (i & 16)
+	    DBG (DBG_proc, "STV(i): Video supported\n");
+	  else
+	    DBG (DBG_proc, "STV(i): Video N/A\n");
+	  if (i & 32)
+	    DBG (DBG_proc, "STV(i): Startup Complete\n");
+	  else
+	    DBG (DBG_proc, "STV(i): Startup Not Complete\n");
+	  if (i & 64)
+	    DBG (DBG_proc, "STV(i): Monochrome\n");
+	  else
+	    DBG (DBG_proc, "STV(i): Color\n");
+	  if (i & 128)
+	    DBG (DBG_proc, "STV(i): Mem fitted\n");
+	  else
+	    DBG (DBG_proc, "STV(i): Mem not fitted\n");
+
+	  DBG (DBG_proc, "urb 25 CMDID_GET_IMAGE_INFO\n");
+	  sizer = 0x10;
+	  status =
+	    sanei_usb_control_msg (dev->fd, 0xc1, 0x86, 0x0000, 0, sizer,
+				   dev->windowr);
+	  if (status != SANE_STATUS_GOOD)
+	    {
+	      return SANE_FALSE;
+	    }
+	  hexdump (DBG_info2, "urb25 CMDID_GET_IMAGE_INFO", dev->windowr,
+		   sizer);
+	  DBG (DBG_proc, "STV(i): Current image index %d\n",
+	       ((dev->windowr[0] << 8) + (dev->windowr[1])));
+	  DBG (DBG_proc,
+	       "If images are stored in camera, they will be lost when captering images is started!!!!!\n");
+	  DBG (DBG_proc, "STV(i): Max images %d\n",
+	       ((dev->windowr[2] << 8) + (dev->windowr[3])));
+	  DBG (DBG_proc, "STV(i): Image width (pix) %d\n",
+	       ((dev->windowr[4] << 8) + (dev->windowr[5])));
+	  DBG (DBG_proc, "STV(i): Image height (pix) %d\n",
+	       ((dev->windowr[6] << 8) + (dev->windowr[7])));
+	  DBG (DBG_proc, "STV(i): Image size camera %d bytes\n",
+	       ((dev->windowr[8] << 24) + (dev->windowr[9] << 16) +
+		(dev->windowr[10] << 8) + (dev->windowr[11])));
+
+	  /*  configuration = 1, interface = 0, alternate = 1 */
+	  status = stv680_set_config (dev, 1, 0, 1);
+	  /*
+	  if (status != SANE_STATUS_GOOD)
+	    {
+	      DBG (DBG_error,
+		   "stv680_vidcam_init: STV680 FAILED to set configure\n");
+	      return status;
+	    }
+
+	  DBG (DBG_info, "stv680_identify_vidcam: exit vidcam supported\n");
+	  */
+	  return SANE_TRUE;
+	}
+    }
+  DBG (DBG_error, "stv680_identify_vidcam: exit this is not a STV680 exit\n");
+  return SANE_FALSE;
+}
+
+static SANE_Status
+stv680_vidcam_init (Stv680_Vidcam * dev)
+{
+  SANE_Status status;
+  SANE_Byte i = 0;
+  SANE_Byte val = 0;
+  size_t sizer;
+  size_t sizew;
+  DBG (DBG_proc, "stv680_vidcam_init: open\n");
+
+  sizew = dev->windoww_size;
+  sizer = dev->windowr_size;
+
+  memset (dev->windoww, 0, sizew);
+  memset (dev->windowr, 0, sizer);
+
+  DBG (DBG_proc, "stv680_vidcam_init: urb 13 CMDID_GET_USER_INFO\n");
+  dev->video_status = 0x04;	/* dummy value busy */
+
+  while (dev->video_status == 0x04)
+    {
+      sizer = 0x08;
+      status =
+	sanei_usb_control_msg (dev->fd, 0xc1, 0x8d, 0x0000, 0, sizer,
+			       dev->windowr);
+      if (status != SANE_STATUS_GOOD)
+	return status;
+
+      hexdump (DBG_info2, "stv680_vidcam_init: urb13 CMDID_GET_USER_INFO",
+	       dev->windowr, sizer);
+
+      dev->video_status = dev->windowr[1];
+      if (dev->video_status == 0x02)
+	{
+	  DBG (DBG_proc, "stv680_vidcam_init: status = video\n");
+	}
+      else if ((dev->video_status == 0x01) || (dev->video_status == 0x08))
+	{
+	  DBG (DBG_proc, "stv680_vidcam_init: status=%d\n",
+	       dev->video_status);
+	}
+      else if (dev->video_status != 0x04)
+	{
+	  DBG (DBG_proc, "stv680_vidcam_init: status = busy\n");
+	  /*  CMDID_CANCEL_TRANSACTION */
+	  status =
+	    sanei_usb_control_msg (dev->fd, 0x41, 0x04, 0x0000, 0, 0, 0);
+	  if (status != SANE_STATUS_GOOD)
+	    {
+	      DBG (DBG_info,
+		   "stv680_vidcam_init: urb13 CMDID_CANCEL_TRANSACTION NOK\n");
+	      return status;
+	    }
+	}
+    }
+
+  if (dev->video_status == 0x01 || dev->video_status == 0x08)
+    {
+      DBG (DBG_proc, "stv680_vidcam_init: urb 21 CMDID_GET_COLDATA_SIZE\n");
+      sizer = 0x02;
+      status =
+	sanei_usb_control_msg (dev->fd, 0xc1, 0x8a, 0x0000, 0, sizer,
+			       dev->windowr);
+      if (status != SANE_STATUS_GOOD)
+	return status;
+
+      val = dev->windowr[0];
+      hexdump (DBG_info2, "stv680_vidcam_init: urb21 CMDID_GET_COLDATA_SIZE",
+	       dev->windowr, sizer);
+      if (dev->windowr[0] &= 0x00)
+	DBG (DBG_info,
+	     "stv680_vidcam_init: no camera defaults, must be downloaded?\n");
+
+      sizer = 0x10;
+      for (i = 0; i < val; i += 0x10)
+	{
+	  DBG (DBG_proc,
+	       "stv680_vidcam_init: urb 22, 23, 24 CMDID_GET_COLDATA i=0x%x, val=0x%x\n",
+	       i, val);
+	  status =
+	    sanei_usb_control_msg (dev->fd, 0xc1, 0x8b, (i << 8), 0, sizer,
+				   dev->windowr);
+	  if (status != SANE_STATUS_GOOD)
+	    return status;
+	  hexdump (DBG_info2,
+		   "stv680_vidcam_init: urb22, 23, 24 CMDID_GET_COLDATA",
+		   dev->windowr, sizer);
+	}
+
+      sizer = 0x12;
+      status =
+	sanei_usb_control_msg (dev->fd, 0x80, 0x06, 0x0100, 0, sizer,
+			       dev->windowr);
+      if (status != SANE_STATUS_GOOD)
+	return status;
+      /* if (!(i > 0) && (dev->windowr[8] == 0x53) && (dev->windowr[9] == 0x05))
+         {
+         DBG (DBG_proc, "STV(e): Could not get descriptor 0100.");
+       *//* return status;  *//*
+         } */
+      sizer = 0x12;
+      hexdump (DBG_info2, "stv680_vidcam_init: CMDID_SET_IMAGE_INDEX",
+	       dev->windowr, sizer);
+
+      /*  configuration = 1, interface = 0, alternate = 1 */
+      status = stv680_set_config (dev, 1, 0, 1);
+      if (status != SANE_STATUS_GOOD)
+	{
+	  DBG (DBG_error,
+	       "stv680_vidcam_init: STV680 FAILED to set configure\n");
+	  return status;
+	}
+    }
+  /*  Switch to Video mode: 0x0000 = CIF (352x288), 0x0200 = QCIF (176x144)  */
+  /*  Switch to Video mode: 0x0100 = VGA (640x480), 0x0300 = QVGA (320x240)  */
+  sizew = 0x0;
+  status =
+    sanei_usb_control_msg (dev->fd, 0x41, 0x09, dev->video_mode, 0, sizew,
+			   dev->windoww);
+  if (status != SANE_STATUS_GOOD)
+    {
+      DBG (DBG_proc, "stv680_vidcam_init: video_mode = 0x%x\n",
+	   dev->video_mode);
+      return status;
+    }
+  DBG (DBG_proc,
+       "stv680_vidcam_init: CMDID_START_VIDEO: video_mode=0x%x\n",
+       dev->video_mode);
+
+  if (dev->x_resolution == 176)
+    {
+      usleep (1000);		/* delay time needed */
+    }
+  status = SANE_STATUS_GOOD;
+
+  if (status)
+    {
+      DBG (DBG_error, "stv680_vidcam_init failed : %s\n",
+	   sane_strstatus (status));
+      return status;
+    }
+  DBG (DBG_proc, "stv680_vidcam_init: exit\n");
+  return status;
+}
+
+/* Attach a vidcam to this backend. */
+static SANE_Status
+attach_vidcam (SANE_String_Const devicename, Stv680_Vidcam ** devp)
+{
+  Stv680_Vidcam *dev;
+  int fd;
+  SANE_Status status;
+
+  DBG (DBG_proc, "attach_vidcam: %s\n", devicename);
+
+  if (devp)
+    *devp = NULL;
+
+  /* Check if we know this device name. */
+  for (dev = first_dev; dev; dev = dev->next)
+    {
+      if (strcmp (dev->sane.name, devicename) == 0)
+	{
+	  if (devp)
+	    {
+	      *devp = dev;
+	    }
+	  DBG (DBG_info, "device is already known\n");
+	  return SANE_STATUS_GOOD;
+	}
+    }
+
+  /* Allocate a new vidcam entry. */
+  dev = stv680_init ();
+  if (dev == NULL)
+    {
+      DBG (DBG_error, "stv680_init ERROR: not enough memory\n");
+      return SANE_STATUS_NO_MEM;
+    }
+
+  DBG (DBG_info, "attach_vidcam: opening USB device %s\n", devicename);
+
+  if (sanei_usb_open (devicename, &fd) != 0)
+    {
+      DBG (DBG_error, "ERROR: attach_vidcam: open failed\n");
+      stv680_free (dev);
+      return SANE_STATUS_INVAL;
+    }
+  /* Fill some scanner specific values. */
+  dev->devicename = strdup (devicename);
+  dev->fd = fd;
+
+  /* Now, check that it is a vidcam we support. */
+
+  if (stv680_identify_vidcam (dev) == SANE_FALSE)
+    {
+      DBG (DBG_error, "ERROR: attach_vidcam: vidcam-identification failed\n");
+      stv680_free (dev);
+      return SANE_STATUS_INVAL;
+    }
+
+  /* Allocate a buffer memory. */
+  status = stv680_init_2 (dev);
+  if (status != SANE_STATUS_GOOD)
+    {
+      DBG (DBG_error, "stv680_initi_2, ERROR: not enough memory\n");
+      return SANE_STATUS_NO_MEM;
+    }
+
+  stv680_close (dev);
+
+  DBG (DBG_info, "attach_vidcam: opening USB device %s\n", devicename);
+
+  /* Build list of vidcam supported resolutions. */
+  DBG (DBG_proc, "attach_vidcam: build resolution list\n");
+
+  if (dev->hw->color_adjust[0].resolution_x != 0)
+    {
+      int num_entries;
+      int i;
+      num_entries = 0;
+
+      while (dev->hw->color_adjust[num_entries].resolution_x != 0)
+	num_entries++;
+
+      dev->resolutions_list = malloc (sizeof (SANE_Word) * (num_entries + 1));
+
+      if (dev->resolutions_list == NULL)
+	{
+	  DBG (DBG_error,
+	       "ERROR: attach_vidcam: vidcam resolution list failed\n");
+	  stv680_free (dev);
+	  return SANE_STATUS_NO_MEM;
+	}
+      /* for CIF or VGA sensor different resolutions  */
+      if (dev->CIF)
+	num_entries = 2;
+      if (dev->VGA)
+	num_entries = 3;
+      dev->resolutions_list[0] = num_entries;
+      DBG (DBG_proc, "attach_vidcam: make color resolution table \n");
+      for (i = 0; i < num_entries; i++)
+	{
+	  dev->resolutions_list[i + 1 + dev->VGA + dev->QVGA] =
+	    dev->hw->color_adjust[i].resolution_x;
+	}
+    }
+  else
+    {
+      dev->resolutions_list = NULL;
+    }
+
+  /* Set the default options for that vidcam. */
+  dev->sane.name = dev->devicename;
+  dev->sane.vendor = dev->hw->vendor_name;
+  dev->sane.model = dev->hw->product_name;
+  dev->sane.type = SANE_I18N ("webcam");
+
+  /* Link the vidcam with the others. */
+  dev->next = first_dev;
+  first_dev = dev;
+
+  if (devp)
+    {
+      *devp = dev;
+    }
+
+  num_devices++;
+
+  DBG (DBG_proc, "attach_vidcam: exit\n");
+
+  return SANE_STATUS_GOOD;
+}
+
+static SANE_Status
+attach_one (const char *dev)
+{
+  DBG (DBG_proc, "attach_one: open \n");
+  attach_vidcam (dev, NULL);
+  DBG (DBG_proc, "attach_one: exit \n");
+  return SANE_STATUS_GOOD;
+}
+
+/* Reset the options for that vidcam. */
+static void
+stv680_init_options (Stv680_Vidcam * dev)
+{
+  int i;
+
+  DBG (DBG_proc, "stv680_init_options: open\n");
+
+  /* Pre-initialize the options. */
+  memset (dev->opt, 0, sizeof (dev->opt));
+  memset (dev->val, 0, sizeof (dev->val));
+
+  for (i = 0; i < OPT_NUM_OPTIONS; ++i)
+    {
+      dev->opt[i].size = sizeof (SANE_Word);
+      dev->opt[i].cap = SANE_CAP_SOFT_SELECT | SANE_CAP_SOFT_DETECT;
+    }
+  DBG (DBG_proc,
+       "stv680_init_options: done loop opt_num_options=%d, i=%d \n",
+       OPT_NUM_OPTIONS, i);
+  /* Number of options. */
+  dev->opt[OPT_NUM_OPTS].name = "";
+  dev->opt[OPT_NUM_OPTS].title = SANE_TITLE_NUM_OPTIONS;
+  dev->opt[OPT_NUM_OPTS].desc = SANE_DESC_NUM_OPTIONS;
+  dev->opt[OPT_NUM_OPTS].type = SANE_TYPE_INT;
+  dev->opt[OPT_NUM_OPTS].cap = SANE_CAP_SOFT_DETECT;
+  dev->val[OPT_NUM_OPTS].w = OPT_NUM_OPTIONS;
+
+  /* Mode group */
+  dev->opt[OPT_MODE_GROUP].title = SANE_I18N ("Scan Mode");
+  dev->opt[OPT_MODE_GROUP].desc = "";	/* not valid for a group */
+  dev->opt[OPT_MODE_GROUP].type = SANE_TYPE_GROUP;
+  dev->opt[OPT_MODE_GROUP].cap = 0;
+  dev->opt[OPT_MODE_GROUP].size = 0;
+  dev->opt[OPT_MODE_GROUP].constraint_type = SANE_CONSTRAINT_NONE;
+
+  /* Vidcam supported modes */
+  dev->opt[OPT_MODE].name = SANE_NAME_SCAN_MODE;
+  dev->opt[OPT_MODE].title = SANE_TITLE_SCAN_MODE;
+  dev->opt[OPT_MODE].desc = SANE_DESC_SCAN_MODE;
+  dev->opt[OPT_MODE].type = SANE_TYPE_STRING;
+  dev->opt[OPT_MODE].size = max_string_size (scan_mode_list);
+  dev->opt[OPT_MODE].constraint_type = SANE_CONSTRAINT_STRING_LIST;
+  dev->opt[OPT_MODE].constraint.string_list = scan_mode_list;
+  dev->val[OPT_MODE].s = (SANE_Char *) strdup ("");	/* will be set later */
+
+  /* X and Y resolution */
+  dev->opt[OPT_RESOLUTION].name = SANE_NAME_SCAN_RESOLUTION;
+  dev->opt[OPT_RESOLUTION].title = SANE_TITLE_SCAN_RESOLUTION;
+  dev->opt[OPT_RESOLUTION].desc = SANE_DESC_SCAN_RESOLUTION;
+  dev->opt[OPT_RESOLUTION].type = SANE_TYPE_INT;
+  dev->opt[OPT_RESOLUTION].unit = SANE_UNIT_DPI;
+  dev->opt[OPT_RESOLUTION].constraint_type = SANE_CONSTRAINT_RANGE;
+  dev->val[OPT_RESOLUTION].w = dev->resolutions_list[dev->CIF + dev->QCIF + dev->VGA + dev->QVGA + dev->QSIF];	/* value will be 2 or 3 */
+
+  /* brightness   */
+  dev->opt[OPT_BRIGHTNESS].name = SANE_NAME_BRIGHTNESS;
+  dev->opt[OPT_BRIGHTNESS].title = SANE_TITLE_BRIGHTNESS;
+  dev->opt[OPT_BRIGHTNESS].desc = SANE_DESC_BRIGHTNESS;
+  dev->opt[OPT_BRIGHTNESS].type = SANE_TYPE_INT;
+  dev->opt[OPT_BRIGHTNESS].unit = SANE_UNIT_NONE;
+  dev->opt[OPT_BRIGHTNESS].constraint_type = SANE_CONSTRAINT_RANGE;
+  dev->opt[OPT_BRIGHTNESS].constraint.range = &brightness_range;
+  dev->val[OPT_BRIGHTNESS].w = 0;	/* to get middle value */
+
+  /* Enhancement group */
+  dev->opt[OPT_ENHANCEMENT_GROUP].title = SANE_I18N ("Enhancement");
+  dev->opt[OPT_ENHANCEMENT_GROUP].desc = "";	/* not valid for a group */
+  dev->opt[OPT_ENHANCEMENT_GROUP].type = SANE_TYPE_GROUP;
+  dev->opt[OPT_ENHANCEMENT_GROUP].cap = SANE_CAP_ADVANCED;
+  dev->opt[OPT_ENHANCEMENT_GROUP].size = 0;
+  dev->opt[OPT_ENHANCEMENT_GROUP].constraint_type = SANE_CONSTRAINT_NONE;
+
+  /* red level calibration manual correction */
+  dev->opt[OPT_WHITE_LEVEL_R].name = SANE_NAME_WHITE_LEVEL_R;
+  dev->opt[OPT_WHITE_LEVEL_R].title = SANE_TITLE_WHITE_LEVEL_R;
+  dev->opt[OPT_WHITE_LEVEL_R].desc = SANE_DESC_WHITE_LEVEL_R;
+  dev->opt[OPT_WHITE_LEVEL_R].type = SANE_TYPE_INT;
+  dev->opt[OPT_WHITE_LEVEL_R].unit = SANE_UNIT_NONE;
+  dev->opt[OPT_WHITE_LEVEL_R].constraint_type = SANE_CONSTRAINT_RANGE;
+  dev->opt[OPT_WHITE_LEVEL_R].constraint.range = &red_level_range;
+  dev->val[OPT_WHITE_LEVEL_R].w = 00;	/* to get middle value */
+
+  /* green level calibration manual correction */
+  dev->opt[OPT_WHITE_LEVEL_G].name = SANE_NAME_WHITE_LEVEL_G;
+  dev->opt[OPT_WHITE_LEVEL_G].title = SANE_TITLE_WHITE_LEVEL_G;
+  dev->opt[OPT_WHITE_LEVEL_G].desc = SANE_DESC_WHITE_LEVEL_G;
+  dev->opt[OPT_WHITE_LEVEL_G].type = SANE_TYPE_INT;
+  dev->opt[OPT_WHITE_LEVEL_G].unit = SANE_UNIT_NONE;
+  dev->opt[OPT_WHITE_LEVEL_G].constraint_type = SANE_CONSTRAINT_RANGE;
+  dev->opt[OPT_WHITE_LEVEL_G].constraint.range = &green_level_range;
+  dev->val[OPT_WHITE_LEVEL_G].w = 00;	/* to get middle value */
+
+  /* blue level calibration manual correction */
+  dev->opt[OPT_WHITE_LEVEL_B].name = SANE_NAME_WHITE_LEVEL_B;
+  dev->opt[OPT_WHITE_LEVEL_B].title = SANE_TITLE_WHITE_LEVEL_B;
+  dev->opt[OPT_WHITE_LEVEL_B].desc = SANE_DESC_WHITE_LEVEL_B;
+  dev->opt[OPT_WHITE_LEVEL_B].type = SANE_TYPE_INT;
+  dev->opt[OPT_WHITE_LEVEL_B].unit = SANE_UNIT_NONE;
+  dev->opt[OPT_WHITE_LEVEL_B].constraint_type = SANE_CONSTRAINT_RANGE;
+  dev->opt[OPT_WHITE_LEVEL_B].constraint.range = &blue_level_range;
+  dev->val[OPT_WHITE_LEVEL_B].w = 00;	/* to get middle value */
+
+  DBG (DBG_proc, "stv680_init_options: after blue level\n");
+
+  /* Lastly, set the default scan mode. This might change some
+   * values previously set here. */
+
+  sane_control_option (dev, OPT_MODE, SANE_ACTION_SET_VALUE,
+		       (SANE_String_Const *) scan_mode_list[0], NULL);
+  DBG (DBG_proc, "stv680_init_options: exit\n");
+}
+
+/* Read the image from the vidcam and fill the temporary buffer with it. */
+static SANE_Status
+stv680_fill_image (Stv680_Vidcam * dev)
+{
+  SANE_Status status;
+  size_t size;
+  size_t bulk_size_read;
+
+  assert (dev->image_begin == dev->image_end);
+  assert (dev->real_bytes_left > 0);
+
+  DBG (DBG_proc, "stv680_fill_image: enter\n");
+
+  DBG (DBG_proc, "stv680_fill_image: real dev bytes left=0x%lx \n",
+       (unsigned long) (size_t) dev->real_bytes_left);
+  bulk_size_read = dev->real_bytes_left;
+
+  while (dev->real_bytes_left)
+    {
+      /* Try to read the maximum number of bytes. */
+      DBG (DBG_proc,
+	   "stv680_fill_image: real dev bytes left, while loop=0x%lx \n",
+	   (unsigned long) (size_t) dev->real_bytes_left);
+
+      size = dev->real_bytes_left;
+      if (size < bulk_size_read)
+	{
+	  size = bulk_size_read;	/* it seems size can not be smaller then read by bulk */
+	}
+      if (size == 0)
+	{
+	  /* Probably reached the end of the buffer. Check, just in case. */
+	  assert (dev->image_end != 0);
+	  return (SANE_STATUS_GOOD);
+	}
+
+      /* Do the transfer */
+
+      DBG (DBG_proc,
+	   "stv680_fill_image: dev->real_bytes_left: 0x%lx size: 0x%lx\n",
+	   (unsigned long) (size_t) dev->real_bytes_left, (unsigned long) (size_t) size);
+      usleep (3000);
+      /* urb 44 first read bulk */
+
+      status = sanei_usb_read_bulk (dev->fd, dev->buffer, &size);
+
+      if (status != SANE_STATUS_GOOD)
+	{
+	  return status;
+	}
+
+      DBG (DBG_info,
+	   "stv680_fill_image: size (read) = 0x%lx bytes (bpl=0x%lx)\n",
+	   (unsigned long) (size_t) size, (unsigned long) (size_t) dev->params.bytes_per_line);
+
+      memcpy (dev->image + dev->image_end, dev->buffer, size);
+
+      dev->image_end += size;
+      bulk_size_read = size;
+      if (dev->real_bytes_left > size)
+	dev->real_bytes_left -= size;
+      else if (dev->real_bytes_left <= size)	/* last loop */
+	dev->real_bytes_left = 0;
+      DBG (DBG_info, "stv680_fill_image: real bytes left = 0x%lx\n",
+	   (unsigned long) (size_t) dev->real_bytes_left);
+    }
+  /*    i = stv_sndctrl (0, dev, 0x80, 0, &window, 0x02); *//* Get Last Error */
+/*	DBG (DBG_proc, "STV(i): last error: %i,  command = 0x%x", window[0], window[1]);
+	return -1; */
+/*		
+	}
+	return 0;  */
+
+  DBG (DBG_proc, "stv680_fill_image: exit\n");
+  return (SANE_STATUS_GOOD);	/* unreachable */
+}
+
+#define MSG_MAXLEN   45
+#define CHAR_HEIGHT  11
+#define CHAR_WIDTH   6
+#define CHAR_START   4
+
+static SANE_Status
+stv680_add_text (SANE_Byte * image, int width, int height, char *txt)
+{
+  SANE_Status status;
+  time_t t;
+  struct tm *tm;
+  char line[MSG_MAXLEN + 1];
+  SANE_Byte *ptr;
+  int i, x, y, f, len;
+  char fmtstring[25] = " %Y-%m-%d %H:%M:%S";
+  char fmttxt[46];
+
+  DBG (DBG_proc, "stv680_add_text: enter\n");
+  time (&t);
+  tm = localtime (&t);
+  if (strlen (txt) > (MSG_MAXLEN - 23))
+    strncpy (fmttxt, txt, (MSG_MAXLEN - 23));
+  else
+    strcpy (fmttxt, txt);
+  strcat (fmttxt, fmtstring);
+
+  len = strftime (line, MSG_MAXLEN, fmttxt, tm);
+
+  for (y = 0; y < CHAR_HEIGHT; y++)
+    {
+      ptr = image + 3 * width * (height - CHAR_HEIGHT - 2 + y) + 12;
+
+      for (x = 0; x < len; x++)
+	{
+	  f = fontdata[line[x] * CHAR_HEIGHT + y];
+	  for (i = CHAR_WIDTH - 1; i >= 0; i--)
+	    {
+	      if (f & (CHAR_START << i))
+		{
+		  ptr[0] = 255;
+		  ptr[1] = 255;
+		  ptr[2] = 255;
+		}
+	      ptr += 3;
+	    }			/* for i */
+	}			/* for x */
+    }				/* for y */
+
+  DBG (DBG_proc, "stv680_add_text: exit vw=%d, vh=%d\n", width, height);
+  status = (SANE_STATUS_GOOD);
+  return status;
+
+}
+
+/* **************************  Video Decoding  *********************  */
+
+static SANE_Status
+stv680_bayer_unshuffle (Stv680_Vidcam * dev, SANE_Byte * buf, size_t * size)
+{
+  SANE_Status status;
+  int x, y;
+  int i = 0;
+  int RED, GREEN, BLUE;
+  int w = dev->cwidth;
+  int vw = dev->x_resolution;
+  int vh = dev->y_resolution;
+  SANE_Byte p = 0;
+  int colour = 0, bayer = 0;
+  int bright_red;
+  int bright_green;
+  int bright_blue;
+  int count;
+
+  RED = dev->red_s;
+  GREEN = dev->green_s;
+  BLUE = dev->blue_s;
+
+  DBG (DBG_proc, "stv680_bayer_unshuffle: enter\n");
+
+#define AD(x, y, w) (((y)*(w)+(x))*3)
+
+  DBG (DBG_proc,
+       "stv680_bayer_unshuffle: color read RED=%d, GREEN=%d, BLUE=%d\n",
+       RED, GREEN, BLUE);
+
+  DBG (DBG_proc, "stv680_bayer_unshuffle: w=%d, vw=%d, vh=%d, len=0x%lx\n",
+       w, vw, vh, (unsigned long) (size_t) size);
+
+  for (y = 0; y < vh; y++)
+    {
+      for (x = 0; x < vw; x++)
+	{
+	  if (x & 1)
+	    {
+	      p = dev->image[y * w + (x >> 1)];
+	    }
+	  else
+	    {
+	      p = dev->image[y * w + (x >> 1) + (w >> 1)];
+	    }
+	  if (y & 1)
+	    bayer = 2;
+	  else
+	    bayer = 0;
+	  if (x & 1)
+	    bayer++;
+
+	  switch (bayer)
+	    {
+	    case 0:
+	    case 3:
+	      colour = 1;
+	      break;
+	    case 1:
+	      colour = 0;
+	      break;
+	    case 2:
+	      colour = 2;
+	      break;
+	    }
+	  i = (y * vw + x) * 3;
+	  *(dev->output + i + colour) = (SANE_Byte) p;
+	}			/* for x */
+
+    }				/* for y */
+
+	/****** gamma correction plus hardcoded white balance */
+  /* Correction values red[], green[], blue[], are generated by 
+     (pow(i/256.0, GAMMA)*255.0)*white balanceRGB where GAMMA=0.55, 1<i<255. 
+     White balance (RGB)= 1.0, 1.17, 1.48. Values are calculated as double float and 
+     converted to unsigned char. Values are in stv680.h  */
+  if (dev->scan_mode == STV680_COLOR_RGB
+      || dev->scan_mode == STV680_COLOR_RGB_TEXT)
+    {
+      for (y = 0; y < vh; y++)
+	{
+	  for (x = 0; x < vw; x++)
+	    {
+	      i = (y * vw + x) * 3;
+	      *(dev->output + i) = red_g[*(dev->output + i)];
+	      *(dev->output + i + 1) = green_g[*(dev->output + i + 1)];
+	      *(dev->output + i + 2) = blue_g[*(dev->output + i + 2)];
+	    }
+	}
+    }
+  DBG (DBG_proc, "stv680_bayer_unshuffle: gamma correction done\n");
+
+  if (dev->scan_mode != STV680_COLOR_RAW)
+    {
+
+	/******  bayer demosaic  ******/
+      for (y = 1; y < (vh - 1); y++)
+	{
+	  for (x = 1; x < (vw - 1); x++)
+	    {			/* work out pixel type */
+	      if (y & 1)
+		bayer = 0;
+	      else
+		bayer = 2;
+	      if (!(x & 1))
+		bayer++;
+	      switch (bayer)
+		{
+		case 0:	/* green. blue lr, red tb */
+		  *(dev->output + AD (x, y, vw) + BLUE) =
+		    ((int) *(dev->output + AD (x - 1, y, vw) + BLUE) +
+		     (int) *(dev->output + AD (x + 1, y, vw) + BLUE)) >> 1;
+		  *(dev->output + AD (x, y, vw) + RED) =
+		    ((int) *(dev->output + AD (x, y - 1, vw) + RED) +
+		     (int) *(dev->output + AD (x, y + 1, vw) + RED)) >> 1;
+		  break;
+
+		case 1:	/* blue. green lrtb, red diagonals */
+		  *(dev->output + AD (x, y, vw) + GREEN) =
+		    ((int) *(dev->output + AD (x - 1, y, vw) + GREEN) +
+		     (int) *(dev->output + AD (x + 1, y, vw) + GREEN) +
+		     (int) *(dev->output + AD (x, y - 1, vw) + GREEN) +
+		     (int) *(dev->output + AD (x, y + 1, vw) + GREEN)) >> 2;
+		  *(dev->output + AD (x, y, vw) + RED) =
+		    ((int) *(dev->output + AD (x - 1, y - 1, vw) + RED) +
+		     (int) *(dev->output + AD (x - 1, y + 1, vw) + RED) +
+		     (int) *(dev->output + AD (x + 1, y - 1, vw) + RED) +
+		     (int) *(dev->output + AD (x + 1, y + 1, vw) + RED)) >> 2;
+		  break;
+
+		case 2:	/* red. green lrtb, blue diagonals */
+		  *(dev->output + AD (x, y, vw) + GREEN) =
+		    ((int) *(dev->output + AD (x - 1, y, vw) + GREEN) +
+		     (int) *(dev->output + AD (x + 1, y, vw) + GREEN) +
+		     (int) *(dev->output + AD (x, y - 1, vw) + GREEN) +
+		     (int) *(dev->output + AD (x, y + 1, vw) + GREEN)) >> 2;
+		  *(dev->output + AD (x, y, vw) + BLUE) =
+		    ((int) *(dev->output + AD (x - 1, y - 1, vw) + BLUE) +
+		     (int) *(dev->output + AD (x + 1, y - 1, vw) + BLUE) +
+		     (int) *(dev->output + AD (x - 1, y + 1, vw) + BLUE) +
+		     (int) *(dev->output + AD (x + 1, y + 1, vw) +
+			     BLUE)) >> 2;
+		  break;
+
+		case 3:	/* green. red lr, blue tb */
+		  *(dev->output + AD (x, y, vw) + RED) =
+		    ((int) *(dev->output + AD (x - 1, y, vw) + RED) +
+		     (int) *(dev->output + AD (x + 1, y, vw) + RED)) >> 1;
+		  *(dev->output + AD (x, y, vw) + BLUE) =
+		    ((int) *(dev->output + AD (x, y - 1, vw) + BLUE) +
+		     (int) *(dev->output + AD (x, y + 1, vw) + BLUE)) >> 1;
+		  break;
+		}		/* switch */
+	    }			/* for x */
+	}			/* for y  - end demosaic  */
+    }				/* no bayer demosaic */
+  DBG (DBG_proc, "stv680_bayer_unshuffle: bayer demosaic done\n");
+
+  /* fix top and bottom row, left and right side */
+  i = vw * 3;
+  memcpy (dev->output, (dev->output + i), i);
+
+  memcpy ((dev->output + (vh * i)), (dev->output + ((vh - 1) * i)), i);
+
+
+  for (y = 0; y < vh; y++)
+    {
+      i = y * vw * 3;
+      memcpy ((dev->output + i), (dev->output + i + 3), 3);
+      memcpy ((dev->output + i + (vw * 3)),
+	      (dev->output + i + (vw - 1) * 3), 3);
+    }
+
+  /*  process all raw data, then trim to size if necessary */
+  if (dev->subsample == 160)
+    {
+      i = 0;
+      for (y = 0; y < vh; y++)
+	{
+	  if (!(y & 1))
+	    {
+	      for (x = 0; x < vw; x++)
+		{
+		  p = (y * vw + x) * 3;
+		  if (!(x & 1))
+		    {
+		      *(dev->output + i) = *(dev->output + p);
+		      *(dev->output + i + 1) = *(dev->output + p + 1);
+		      *(dev->output + i + 2) = *(dev->output + p + 2);
+		      i += 3;
+		    }
+		}		/* for x */
+	    }
+	}			/* for y */
+
+      DBG (DBG_proc,
+	   "stv680_bayer_unshuffle: if needed, trim to size 160 done\n");
+    }
+  /* reset to proper width */
+  if ((dev->subsample == 160))
+    {
+      vw = 160;
+      vh = 120;
+    }
+
+  /* brightness adjustment */
+
+  count = vw * vh * 3;
+
+  bright_red = (dev->val[OPT_BRIGHTNESS].w) + (dev->val[OPT_WHITE_LEVEL_R].w);
+  bright_green =
+    (dev->val[OPT_BRIGHTNESS].w) + (dev->val[OPT_WHITE_LEVEL_G].w);
+  bright_blue =
+    (dev->val[OPT_BRIGHTNESS].w) + (dev->val[OPT_WHITE_LEVEL_B].w);
+
+  for (x = 0; x < count; x++)
+    {
+      y = x + 1;
+      i = x + 2;
+      if ((*(dev->output + x) + bright_red) >= 255)
+	*(buf + x) = 255;
+
+      else if ((*(dev->output + x) + bright_red) <= 0)
+	*(buf + x) = 0;
+      else
+	*(buf + x) = (*(dev->output + x) + bright_red);
+
+      if ((*(dev->output + y) + bright_green) >= 255)
+	*(buf + y) = 255;
+
+      else if ((*(dev->output + y) + bright_green) <= 0)
+	*(buf + y) = 0;
+      else
+	*(buf + y) = (*(dev->output + y) + bright_green);
+
+      if ((*(dev->output + i) + bright_blue) >= 255)
+	*(buf + i) = 255;
+
+      else if ((*(dev->output + i) + bright_blue) <= 0)
+	*(buf + i) = 0;
+      else
+	*(buf + i) = (*(dev->output + i) + bright_blue);
+
+      x += 2;
+    }
+
+  if (dev->scan_mode == STV680_COLOR_RGB_TEXT)
+    {
+      strcpy (dev->picmsg_ps, "STVcam ");
+
+      status = stv680_add_text (buf, vw, vh, dev->picmsg_ps);
+      if (status != SANE_STATUS_GOOD)
+	{
+	  DBG (DBG_info, "stv680_bayer_unshuffle status NOK\n");
+	  return (status);
+	}
+    }
+
+  DBG (DBG_proc, "stv680_bayer_unshuffle: exit vw=%d, vh=%d\n", vw, vh);
+  status = (SANE_STATUS_GOOD);
+  return status;
+}
+
+/* Sane entry points */
+
+SANE_Status
+sane_init (SANE_Int * version_code, SANE_Auth_Callback authorize)
+{
+  FILE *fp;
+  char line[PATH_MAX];
+  size_t len;
+
+  num_devices = 0;
+  devlist = NULL;
+  first_dev = NULL;
+
+  DBG_INIT ();
+
+  DBG (DBG_sane_init, "sane_init\n");
+
+  authorize = authorize;	/* silence gcc */
+
+  DBG (DBG_error, "This is sane-stv680 version %d.%d-%d\n", SANE_CURRENT_MAJOR,
+       V_MINOR, BUILD);
+  DBG (DBG_error, "(C) 2004-2006 by Gerard Klaver\n");
+
+  if (version_code)
+    {
+      *version_code = SANE_VERSION_CODE (SANE_CURRENT_MAJOR, V_MINOR, BUILD);
+    }
+
+  DBG (DBG_proc, "sane_init: authorize %s null\n", authorize ? "!=" : "==");
+
+  sanei_usb_init ();
+
+  fp = sanei_config_open (STV680_CONFIG_FILE);
+  if (!fp)
+    {
+      /* No default vidcam? */
+      DBG (DBG_warning, "configuration file not found (%s)\n",
+	   STV680_CONFIG_FILE);
+
+      return SANE_STATUS_GOOD;
+    }
+
+  while (sanei_config_read (line, sizeof (line), fp))
+    {
+      SANE_Word vendor;
+      SANE_Word product;
+
+      if (line[0] == '#')	/* ignore line comments */
+	continue;
+      len = strlen (line);
+
+      if (!len)
+	continue;		/* ignore empty lines */
+      if (sscanf (line, "usb %i %i", &vendor, &product) == 2)
+	{
+
+	  sanei_usb_attach_matching_devices (line, attach_one);
+	}
+      else
+	{
+	  /* Garbage. Ignore. */
+	  DBG (DBG_warning, "bad configuration line: \"%s\" - ignoring.\n",
+	       line);
+	}
+    }
+
+  fclose (fp);
+
+  DBG (DBG_proc, "sane_init: leave\n");
+
+  return SANE_STATUS_GOOD;
+}
+
+SANE_Status
+sane_get_devices (const SANE_Device *** device_list, SANE_Bool local_only)
+{
+  Stv680_Vidcam *dev;
+  int i;
+
+  DBG (DBG_proc, "sane_get_devices: enter\n");
+
+  local_only = local_only;	/* silence gcc */
+
+  if (devlist)
+    free (devlist);
+
+  devlist = malloc ((num_devices + 1) * sizeof (devlist[0]));
+  if (!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;
+
+  DBG (DBG_proc, "sane_get_devices: exit\n");
+
+  return SANE_STATUS_GOOD;
+}
+
+SANE_Status
+sane_open (SANE_String_Const devicename, SANE_Handle * handle)
+{
+  Stv680_Vidcam *dev;
+  SANE_Status status;
+
+  DBG (DBG_proc, "sane_open: enter\n");
+
+  /* search for devicename */
+  if (devicename[0])
+    {
+      DBG (DBG_info, "sane_open: devicename=%s\n", devicename);
+
+      for (dev = first_dev; dev; dev = dev->next)
+	{
+	  if (strcmp (dev->sane.name, devicename) == 0)
+	    {
+	      break;
+	    }
+	}
+
+      if (!dev)
+	{
+	  status = attach_vidcam (devicename, &dev);
+	  if (status != SANE_STATUS_GOOD)
+	    {
+	      return status;
+	    }
+	}
+    }
+  else
+    {
+      DBG (DBG_sane_info, "sane_open: no devicename, opening first device\n");
+      dev = first_dev;		/* empty devicename -> use first device */
+    }
+
+  if (!dev)
+    {
+      DBG (DBG_error, "No vidcam found\n");
+
+      return SANE_STATUS_INVAL;
+    }
+
+  stv680_init_options (dev);
+
+  *handle = dev;
+
+  DBG (DBG_proc, "sane_open: exit\n");
+
+  return SANE_STATUS_GOOD;
+}
+
+const SANE_Option_Descriptor *
+sane_get_option_descriptor (SANE_Handle handle, SANE_Int option)
+{
+  Stv680_Vidcam *dev = handle;
+
+  DBG (DBG_proc, "sane_get_option_descriptor: enter, option %d\n", option);
+
+  if ((unsigned) option >= OPT_NUM_OPTIONS)
+    {
+      return NULL;
+    }
+
+  DBG (DBG_proc, "sane_get_option_descriptor: exit\n");
+
+  return dev->opt + option;
+}
+
+SANE_Status
+sane_control_option (SANE_Handle handle, SANE_Int option,
+		     SANE_Action action, void *val, SANE_Int * info)
+{
+  Stv680_Vidcam *dev = handle;
+  SANE_Status status;
+  SANE_Word cap;
+
+  DBG (DBG_proc, "sane_control_option: enter, option %d, action %d\n",
+       option, action);
+
+  if (info)
+    {
+      *info = 0;
+    }
+
+  if (dev->scanning)
+    {
+      return SANE_STATUS_DEVICE_BUSY;
+    }
+
+  if (option < 0 || option >= OPT_NUM_OPTIONS)
+    {
+      return SANE_STATUS_INVAL;
+    }
+
+  cap = dev->opt[option].cap;
+  if (!SANE_OPTION_IS_ACTIVE (cap))
+    {
+      return SANE_STATUS_INVAL;
+    }
+
+  if (action == SANE_ACTION_GET_VALUE)
+    {
+
+      switch (option)
+	{
+	  /* word options */
+	case OPT_NUM_OPTS:
+	case OPT_RESOLUTION:
+	case OPT_BRIGHTNESS:
+	case OPT_WHITE_LEVEL_R:
+	case OPT_WHITE_LEVEL_G:
+	case OPT_WHITE_LEVEL_B:
+	  *(SANE_Word *) val = dev->val[option].w;
+	  return SANE_STATUS_GOOD;
+	case OPT_MODE:
+	  strcpy (val, dev->val[option].s);
+	  return SANE_STATUS_GOOD;
+	default:
+	  return SANE_STATUS_INVAL;
+	}
+    }
+  else if (action == SANE_ACTION_SET_VALUE)
+    {
+
+      if (!SANE_OPTION_IS_SETTABLE (cap))
+	{
+	  DBG (DBG_error, "could not set option, not settable\n");
+	  return SANE_STATUS_INVAL;
+	}
+
+      status = sanei_constrain_value (dev->opt + option, val, info);
+      if (status != SANE_STATUS_GOOD)
+	{
+	  DBG (DBG_error, "could not set option, invalid value\n");
+	  return status;
+	}
+
+      switch (option)
+	{
+
+	  /* Numeric side-effect options */
+	case OPT_RESOLUTION:
+	case OPT_BRIGHTNESS:
+	case OPT_WHITE_LEVEL_R:
+	case OPT_WHITE_LEVEL_G:
+	case OPT_WHITE_LEVEL_B:
+	  if (info)
+	    {
+	      *info |= SANE_INFO_RELOAD_PARAMS;
+	    }
+	  dev->val[option].w = *(SANE_Word *) val;
+	  return SANE_STATUS_GOOD;
+
+	  /* String side-effect options */
+	case OPT_MODE:
+	  if (strcmp (dev->val[option].s, val) == 0)
+	    return SANE_STATUS_GOOD;
+
+	  free (dev->val[OPT_MODE].s);
+	  dev->val[OPT_MODE].s = (SANE_Char *) strdup (val);
+
+	  dev->opt[OPT_WHITE_LEVEL_R].cap &= ~SANE_CAP_INACTIVE;
+	  dev->opt[OPT_WHITE_LEVEL_G].cap &= ~SANE_CAP_INACTIVE;
+	  dev->opt[OPT_WHITE_LEVEL_B].cap &= ~SANE_CAP_INACTIVE;
+
+	  if (strcmp (dev->val[OPT_MODE].s, COLOR_RAW_STR) == 0)
+	    {
+	      dev->scan_mode = STV680_COLOR_RAW;
+	    }
+	  else if (strcmp (dev->val[OPT_MODE].s, COLOR_RGB_STR) == 0)
+	    {
+	      dev->scan_mode = STV680_COLOR_RGB;
+	    }
+	  else if (strcmp (dev->val[OPT_MODE].s, SANE_VALUE_SCAN_MODE_COLOR)
+		   == 0)
+	    {
+	      dev->scan_mode = STV680_COLOR;
+
+	    }
+	  else if (strcmp (dev->val[OPT_MODE].s, COLOR_RGB_TEXT_STR) == 0)
+	    {
+	      dev->scan_mode = STV680_COLOR_RGB_TEXT;
+
+	    }
+
+	  /* The STV680 supports only a handful of resolution. */
+	  /* This the default resolution range for the STV680 */
+
+	  dev->depth = 8;
+	  if (dev->resolutions_list != NULL)
+	    {
+	      int i;
+
+	      dev->opt[OPT_RESOLUTION].constraint_type =
+		SANE_CONSTRAINT_WORD_LIST;
+	      dev->opt[OPT_RESOLUTION].constraint.word_list =
+		dev->resolutions_list;
+
+	      /* If the resolution isn't in the list, set a default. */
+	      for (i = 1; i <= dev->resolutions_list[0]; i++)
+		{
+		  if (dev->resolutions_list[i] >= dev->val[OPT_RESOLUTION].w)
+		    break;
+		}
+	      if (i > dev->resolutions_list[0])
+		{
+		  /* Too big. Take lowest. */
+		  dev->val[OPT_RESOLUTION].w = dev->resolutions_list[1];
+		}
+	      else
+		{
+		  /* Take immediate superioir value. */
+		  dev->val[OPT_RESOLUTION].w = dev->resolutions_list[i];
+		}
+	    }
+
+	  /* String side-effect options */
+
+	  if (info)
+	    {
+	      *info |= SANE_INFO_RELOAD_OPTIONS | SANE_INFO_RELOAD_PARAMS;
+	    }
+	  return SANE_STATUS_GOOD;
+	default:
+	  return SANE_STATUS_INVAL;
+	}
+    }
+
+  DBG (DBG_proc, "sane_control_option: exit, bad\n");
+
+  return SANE_STATUS_UNSUPPORTED;
+}
+
+SANE_Status
+sane_get_parameters (SANE_Handle handle, SANE_Parameters * params)
+{
+  Stv680_Vidcam *dev = handle;
+  int i;
+
+  DBG (DBG_proc, "sane_get_parameters: enter\n");
+
+  if (!(dev->scanning))
+    {
+      dev->x_resolution = dev->val[OPT_RESOLUTION].w;
+      /* Prepare the parameters for the caller. */
+      memset (&dev->params, 0, sizeof (SANE_Parameters));
+
+      dev->params.last_frame = SANE_TRUE;
+
+      switch (dev->scan_mode)
+	{
+	case STV680_COLOR_RAW:
+	  dev->bytes_pixel = 1;	/* raw image is 422 code, 1 byte/pixel */
+	  break;
+	case STV680_COLOR_RGB:
+	case STV680_COLOR_RGB_TEXT:
+	case STV680_COLOR:
+	  dev->bytes_pixel = 3;
+	  break;
+	}
+      dev->params.format = SANE_FRAME_RGB;
+      dev->params.pixels_per_line = dev->x_resolution;
+      dev->params.bytes_per_line =
+	dev->params.pixels_per_line * dev->bytes_pixel;
+      dev->params.depth = 8;
+      if (dev->resolutions_list != NULL)
+	{
+	  /* This vidcam has a fixed number of supported
+	   * resolutions. Find the color sequence for that
+	   * resolution. */
+
+	  for (i = 0;
+	       dev->hw->color_adjust[i].resolution_x != dev->x_resolution;
+	       i++);
+
+	  dev->red_s = dev->hw->color_adjust[i].z1_color_0;
+	  dev->green_s = dev->hw->color_adjust[i].z1_color_1;
+	  dev->blue_s = dev->hw->color_adjust[i].z1_color_2;
+	  dev->y_resolution = dev->hw->color_adjust[i].resolution_y;
+	}
+      dev->subsample = 0;
+      switch (dev->val[OPT_RESOLUTION].w)
+	{
+	case 176:
+	  dev->video_mode = 0x0200;
+	  dev->cwidth = dev->x_resolution + 2;
+	  dev->cheight = dev->y_resolution + 2;
+	  break;
+	case 160:		/* 160x120 subsampled */
+	  dev->x_resolution = 320;
+	  dev->y_resolution = 240;
+	  dev->video_mode = 0x0300;
+	  dev->cwidth = dev->x_resolution + 2;
+	  dev->cheight = dev->y_resolution + 2;
+	  dev->subsample = 160;
+	  break;
+	case 320:
+	  dev->video_mode = 0x0300;
+	  dev->cwidth = dev->x_resolution + 2;
+	  dev->cheight = dev->y_resolution + 2;
+	  break;
+	case 352:
+	  dev->video_mode = 0x0000;
+	  dev->cwidth = dev->x_resolution + 4;
+	  dev->cheight = dev->y_resolution + 4;
+	  break;
+	case 640:
+	  dev->video_mode = 0x0100;
+	  dev->cwidth = dev->x_resolution + 4;
+	  dev->cheight = dev->y_resolution + 4;
+	  break;
+	}
+      dev->params.pixels_per_line = dev->x_resolution;
+      dev->params.lines = dev->y_resolution;
+      DBG (DBG_info, "sane_get_parameters: x=%d, y=%d\n", dev->x_resolution,
+	   dev->y_resolution);
+    }
+
+  /* Return the current values. */
+  if (params)
+    {
+      *params = (dev->params);
+    }
+
+  DBG (DBG_proc, "sane_get_parameters: exit\n");
+
+  return SANE_STATUS_GOOD;
+}
+
+SANE_Status
+sane_start (SANE_Handle handle)
+{
+  Stv680_Vidcam *dev = handle;
+  SANE_Status status;
+
+  DBG (DBG_proc, "sane_start: enter\n");
+
+  if (!(dev->scanning))
+    {
+      sane_get_parameters (dev, NULL);
+
+      /* Open again the vidcam  */
+      if (sanei_usb_open (dev->devicename, &(dev->fd)) != 0)
+	{
+	  DBG (DBG_error, "ERROR: sane_start: open failed\n");
+	  return SANE_STATUS_INVAL;
+	}
+
+      /* Initialize the vidcam. */
+      status = stv680_vidcam_init (dev);
+      if (status)
+	{
+	  DBG (DBG_error, "ERROR: failed to init the vidcam\n");
+	  stv680_close (dev);
+	  return status;
+	}
+
+    }
+
+  dev->image_end = 0;
+  dev->image_begin = 0;
+  /* real_byte_left is bulk read bytes, bytes_left is frontend buffer bytes */
+  dev->real_bytes_left = dev->cwidth * dev->cheight;
+  dev->bytes_left = dev->params.bytes_per_line * dev->params.lines;
+
+  dev->scanning = SANE_TRUE;
+
+  DBG (DBG_proc, "sane_start: exit\n");
+
+  return SANE_STATUS_GOOD;
+}
+
+SANE_Status
+sane_read (SANE_Handle handle, SANE_Byte * buf, SANE_Int max_len,
+	   SANE_Int * len)
+{
+  SANE_Status status;
+  Stv680_Vidcam *dev = handle;
+  size_t size;
+
+  DBG (DBG_proc, "sane_read: enter\n");
+
+  *len = 0;
+  if (dev->deliver_eof)
+    {
+      dev->deliver_eof = 0;
+      return SANE_STATUS_EOF;
+    }
+
+  if (!(dev->scanning))
+    {
+      /* OOPS, not scanning, stop a scan. */
+      stv680_reset_vidcam (dev);
+      stv680_close (dev);
+      dev->scanning = SANE_FALSE;
+      return SANE_STATUS_CANCELLED;
+    }
+
+  if (dev->bytes_left <= 0)
+    {
+      return (SANE_STATUS_EOF);
+    }
+
+  if (dev->image_begin == dev->image_end)
+    {
+      /* Fill image */
+      status = stv680_fill_image (dev);
+      if (status != SANE_STATUS_GOOD)
+	{
+	  DBG (DBG_info, "sane_read: stv680_fill_image status NOK\n");
+	  return (status);
+	}
+    }
+
+  /* Something must have been read */
+  if (dev->image_begin == dev->image_end)
+    {
+      DBG (DBG_info, "sane_read: nothing read\n");
+      return SANE_STATUS_IO_ERROR;
+    }
+
+  size = dev->bytes_left;
+  if (((unsigned int) max_len) < size)
+    {
+      DBG (DBG_error, "sane_read: max_len < size\n");
+      return (SANE_FALSE);
+    }
+  if ((dev->image_end - dev->image_begin) > size)
+    {
+      size = dev->image_end - dev->image_begin;
+      DBG (DBG_proc, "sane_read: size < dev->image_end - dev->image_begin\n");
+    }
+  /* diff between size an dev->bytes_left because of 356/352 and 292/288 */
+  DBG (DBG_info, "sane_read: size =0x%lx bytes, max_len=0x%lx bytes\n",
+       (unsigned long) (size_t) size, (unsigned long) (size_t) max_len);
+
+  *len = dev->bytes_left;	/* needed */
+  size = dev->bytes_left;
+  dev->bytes_left = 0;		/* needed for frontend or ? */
+
+  if (dev->scan_mode != STV680_COLOR_RAW)
+    {
+      /* do bayer unshuffle  after complete frame is read */
+      status = stv680_bayer_unshuffle (dev, buf, &size);
+      if (status != SANE_STATUS_GOOD)
+	{
+	  DBG (DBG_info, "sane_read: stv680_bayer_unshuffle status NOK\n");
+	  return (status);
+	}
+    }
+  else
+    {
+      /* Copy the raw data to the frontend buffer. */
+      memcpy (buf, dev->image, size);
+      DBG (DBG_info, "sane_read: raw mode\n");
+    }
+  DBG (DBG_info, "sane_read: exit\n");
+  status = SANE_STATUS_GOOD;
+  return status;
+}
+
+SANE_Status
+sane_set_io_mode (SANE_Handle handle, SANE_Bool non_blocking)
+{
+
+  DBG (DBG_proc, "sane_set_io_mode: enter\n");
+
+  handle = handle;		/* silence gcc */
+  non_blocking = non_blocking;	/* silence gcc */
+
+
+  DBG (DBG_proc, "sane_set_io_mode: exit\n");
+
+  return SANE_STATUS_UNSUPPORTED;
+}
+
+SANE_Status
+sane_get_select_fd (SANE_Handle handle, SANE_Int * fd)
+{
+  DBG (DBG_proc, "sane_get_select_fd: enter\n");
+
+  handle = handle;		/* silence gcc */
+  fd = fd;			/* silence gcc */
+
+  DBG (DBG_proc, "sane_get_select_fd: exit\n");
+
+  return SANE_STATUS_UNSUPPORTED;
+}
+
+void
+sane_cancel (SANE_Handle handle)
+{
+  Stv680_Vidcam *dev = handle;
+
+  DBG (DBG_proc, "sane_cancel: enter\n");
+
+  /* Stop a scan. */
+  if (dev->scanning == SANE_TRUE)
+    {
+      /* Reset the vidcam */
+      stv680_reset_vidcam (dev);
+      stv680_close (dev);
+    }
+  dev->scanning = SANE_FALSE;
+  dev->deliver_eof = 0;
+
+  /* return SANE_STATUS_CANCELLED; */
+  DBG (DBG_proc, "sane_cancel: exit\n");
+}
+
+void
+sane_close (SANE_Handle handle)
+{
+  Stv680_Vidcam *dev = handle;
+  Stv680_Vidcam *dev_tmp;
+
+  DBG (DBG_proc, "sane_close: enter\n");
+
+/* Stop a scan. */
+
+  if (dev->scanning == SANE_TRUE)
+    {
+      stv680_reset_vidcam (dev);
+      stv680_close (dev);
+    }
+  dev->scanning = SANE_FALSE;
+
+  /* Unlink dev. */
+  if (first_dev == dev)
+    {
+      first_dev = dev->next;
+    }
+  else
+    {
+      dev_tmp = first_dev;
+      while (dev_tmp->next && dev_tmp->next != dev)
+	{
+	  dev_tmp = dev_tmp->next;
+	}
+      if (dev_tmp->next != NULL)
+	{
+	  dev_tmp->next = dev_tmp->next->next;
+	}
+    }
+
+  stv680_free (dev);
+  num_devices--;
+
+  DBG (DBG_proc, "sane_close: exit\n");
+}
+
+void
+sane_exit (void)
+{
+  DBG (DBG_proc, "sane_exit: enter\n");
+
+  while (first_dev)
+    {
+      sane_close (first_dev);
+    }
+
+  if (devlist)
+    {
+      free (devlist);
+      devlist = NULL;
+    }
+
+  DBG (DBG_proc, "sane_exit: exit\n");
+}