New upstream version 1.0.31upstream/1.0.31

1 files changed, 960 insertions, 0 deletions

diff --git a/backend/canon_lide70.c b/backend/canon_lide70.c
new file mode 100644
index 0000000..100a45f
--- /dev/null
+++ b/backend/canon_lide70.c
@@ -0,0 +1,960 @@
+/* sane - Scanner Access Now Easy.
+
+   BACKEND canon_lide70
+
+   Copyright (C) 2019 Juergen Ernst and pimvantend.
+
+   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.
+
+   This file implements a SANE backend for the Canon CanoScan LiDE 70 */
+
+#define BUILD 0
+#define MM_IN_INCH 25.4
+
+#include "../include/sane/config.h"
+
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+
+#include "../include/sane/sane.h"
+#include "../include/sane/sanei.h"
+#include "../include/sane/saneopts.h"
+#include "../include/sane/sanei_config.h"
+#include "../include/sane/sanei_usb.h"
+#define BACKEND_NAME        canon_lide70
+#define CANONUSB_CONFIG_FILE "canon_lide70.conf"
+#include "../include/sane/sanei_backend.h"
+
+typedef enum
+{
+  opt_num_opts = 0,
+  opt_mode_group,
+  opt_threshold,
+  opt_mode,
+  opt_resolution,
+  opt_non_blocking,
+  opt_geometry_group,
+  opt_tl_x,
+  opt_tl_y,
+  opt_br_x,
+  opt_br_y,
+  /* must come last: */
+  num_options
+}
+canon_opts;
+
+#include "canon_lide70-common.c"
+
+static size_t
+max_string_size (const SANE_String_Const strings[])
+{
+  size_t size, max_size = 0;
+  SANE_Int i;
+
+  for (i = 0; strings[i]; ++i)
+    {
+      size = strlen (strings[i]) + 1;
+      if (size > max_size)
+	max_size = size;
+    }
+  return max_size;
+}
+
+static SANE_String_Const mode_list[] = {
+  SANE_VALUE_SCAN_MODE_COLOR,
+  SANE_VALUE_SCAN_MODE_GRAY,
+  SANE_VALUE_SCAN_MODE_LINEART,
+  0
+};
+
+static SANE_Fixed init_tl_x = SANE_FIX (0.0);
+static SANE_Fixed init_tl_y = SANE_FIX (0.0);
+static SANE_Fixed init_br_x = SANE_FIX (80.0);
+static SANE_Fixed init_br_y = SANE_FIX (100.0);
+static SANE_Int init_threshold = 75;
+static SANE_Int init_resolution = 600;
+static SANE_String init_mode = SANE_VALUE_SCAN_MODE_COLOR;
+static SANE_Int init_graymode = 0;
+static SANE_Bool init_non_blocking = SANE_FALSE;
+
+/*-----------------------------------------------------------------*/
+/*
+Scan range
+*/
+
+static const SANE_Range widthRange = {
+  0,				/* minimum */
+  SANE_FIX (CANON_MAX_WIDTH * MM_IN_INCH / 600),	/* maximum */
+  0				/* quantization */
+};
+
+static const SANE_Range heightRange = {
+  0,				/* minimum */
+/*  SANE_FIX (CANON_MAX_HEIGHT * MM_IN_INCH / 600 - TOP_EDGE ),	 maximum */
+  SANE_FIX (297.0),
+  0				/* quantization */
+};
+
+static const SANE_Range threshold_range = {
+  0,
+  100,
+  1
+};
+
+static SANE_Int resolution_list[] = { 5,
+  75,
+  150,
+  300,
+  600,
+  1200
+};
+
+typedef struct Canon_Device
+{
+  struct Canon_Device *next;
+  SANE_String name;
+  SANE_Device sane;
+}
+Canon_Device;
+
+/* Canon_Scanner is the type used for the sane handle */
+typedef struct Canon_Scanner
+{
+  struct Canon_Scanner *next;
+  Canon_Device *device;
+  CANON_Handle scan;
+}
+Canon_Scanner;
+
+static int num_devices = 0;
+static const SANE_Device **devlist = NULL;
+static Canon_Device *first_dev = NULL;
+static Canon_Scanner *first_handle = NULL;
+
+/*-----------------------------------------------------------------*/
+static SANE_Status
+attach_scanner (const char *devicename, Canon_Device ** devp)
+{
+  CANON_Handle scan;
+  Canon_Device *dev;
+  SANE_Status status;
+
+  DBG (3, "attach_scanner: %s\n", devicename);
+
+  for (dev = first_dev; dev; dev = dev->next)
+    {
+      if (strcmp (dev->sane.name, devicename) == 0)
+	{
+	  if (devp)
+	    *devp = dev;
+	  return SANE_STATUS_GOOD;
+	}
+    }
+
+  dev = malloc (sizeof (*dev));
+  if (!dev)
+    return SANE_STATUS_NO_MEM;
+  memset (dev, '\0', sizeof (Canon_Device));	/* clear structure */
+
+  DBG (4, "attach_scanner: opening %s\n", devicename);
+
+  status = CANON_open_device (&scan, devicename);
+  if (status != SANE_STATUS_GOOD)
+    {
+      DBG (1, "ERROR: attach_scanner: opening %s failed\n", devicename);
+      free (dev);
+      return status;
+    }
+  dev->name = strdup (devicename);
+  dev->sane.name = dev->name;
+  dev->sane.vendor = "CANON";
+  dev->sane.model = CANON_get_device_name (&scan);
+  dev->sane.type = "flatbed scanner";
+  CANON_close_device (&scan);
+
+  ++num_devices;
+  dev->next = first_dev;
+  first_dev = dev;
+
+  if (devp)
+    *devp = dev;
+  return SANE_STATUS_GOOD;
+}
+
+
+/* callback function for sanei_usb_attach_matching_devices */
+static SANE_Status
+attach_one (const char *name)
+{
+  attach_scanner (name, 0);
+  return SANE_STATUS_GOOD;
+}
+
+
+/* Find our devices */
+SANE_Status
+sane_init (SANE_Int * version_code, SANE_Auth_Callback authorize)
+{
+  char config_line[PATH_MAX];
+  size_t len;
+  FILE *fp;
+
+  DBG_INIT ();
+
+#if 0
+  DBG_LEVEL = 10;
+#endif
+
+  DBG (2, "sane_init: version_code %s 0, authorize %s 0\n",
+       version_code == 0 ? "=" : "!=", authorize == 0 ? "=" : "!=");
+  DBG (1, "sane_init: SANE Canon LiDE70 backend version %d.%d.%d from %s\n",
+       V_MAJOR, V_MINOR, BUILD, PACKAGE_STRING);
+
+  if (version_code)
+    *version_code = SANE_VERSION_CODE (V_MAJOR, V_MINOR, BUILD);
+
+  sanei_usb_init ();
+
+  fp = sanei_config_open (CANONUSB_CONFIG_FILE);
+
+  if (!fp)
+    {
+      /* no config-file: try these */
+      attach_scanner ("/dev/scanner", 0);
+      attach_scanner ("/dev/usbscanner", 0);
+      attach_scanner ("/dev/usb/scanner", 0);
+      return SANE_STATUS_GOOD;
+    }
+
+  DBG (3, "reading configure file %s\n", CANONUSB_CONFIG_FILE);
+
+  while (sanei_config_read (config_line, sizeof (config_line), fp))
+    {
+      if (config_line[0] == '#')
+	continue;		/* ignore line comments */
+
+      len = strlen (config_line);
+
+      if (!len)
+	continue;		/* ignore empty lines */
+
+      DBG (4, "attach_matching_devices(%s)\n", config_line);
+      sanei_usb_attach_matching_devices (config_line, attach_one);
+    }
+
+  DBG (4, "finished reading configure file\n");
+
+  fclose (fp);
+
+  return SANE_STATUS_GOOD;
+}
+
+
+void
+sane_exit (void)
+{
+  Canon_Device *dev, *next;
+
+  DBG (3, "sane_exit\n");
+
+  for (dev = first_dev; dev; dev = next)
+    {
+      next = dev->next;
+      free (dev->name);
+      free (dev);
+    }
+
+  if (devlist)
+    free (devlist);
+  return;
+}
+
+
+SANE_Status
+sane_get_devices (const SANE_Device *** device_list, SANE_Bool local_only)
+{
+  Canon_Device *dev;
+  int i;
+
+  DBG (3, "sane_get_devices(local_only = %d)\n", local_only);
+
+  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;
+
+  return SANE_STATUS_GOOD;
+}
+
+static SANE_Status
+init_options (CANON_Handle * chndl)
+{
+  SANE_Option_Descriptor *od;
+
+  DBG (2, "begin init_options: chndl=%p\n", (void *) chndl);
+
+  /* opt_num_opts */
+  od = &chndl->opt[opt_num_opts];
+  od->name = "";
+  od->title = SANE_TITLE_NUM_OPTIONS;
+  od->desc = SANE_DESC_NUM_OPTIONS;
+  od->type = SANE_TYPE_INT;
+  od->unit = SANE_UNIT_NONE;
+  od->size = sizeof (SANE_Word);
+  od->cap = SANE_CAP_SOFT_DETECT;
+  od->constraint_type = SANE_CONSTRAINT_NONE;
+  od->constraint.range = 0;
+  chndl->val[opt_num_opts].w = num_options;
+
+  DBG (2, "val[opt_num_opts]: %d\n", chndl->val[opt_num_opts].w);
+
+  /* opt_mode_group */
+  od = &chndl->opt[opt_mode_group];
+  od->name = "";
+  od->title = SANE_I18N ("Scan Mode");
+  od->desc = "";
+  od->type = SANE_TYPE_GROUP;
+  od->unit = SANE_UNIT_NONE;
+  od->size = 0;
+  od->cap = 0;
+  od->constraint_type = SANE_CONSTRAINT_NONE;
+  od->constraint.range = 0;
+  chndl->val[opt_mode_group].w = 0;
+
+  /* opt_mode */
+  od = &chndl->opt[opt_mode];
+  od->name = SANE_NAME_SCAN_MODE;
+  od->title = SANE_TITLE_SCAN_MODE;
+  od->desc = SANE_DESC_SCAN_MODE;
+  od->type = SANE_TYPE_STRING;
+  od->unit = SANE_UNIT_NONE;
+  od->size = max_string_size (mode_list);
+  od->cap = SANE_CAP_SOFT_DETECT | SANE_CAP_SOFT_SELECT;
+  od->constraint_type = SANE_CONSTRAINT_STRING_LIST;
+  od->constraint.string_list = mode_list;
+  chndl->val[opt_mode].s = malloc (od->size);
+  if (!chndl->val[opt_mode].s)
+    return SANE_STATUS_NO_MEM;
+  strcpy (chndl->val[opt_mode].s, init_mode);
+  chndl->graymode = init_graymode;
+
+  /* opt_threshold */
+  od = &chndl->opt[opt_threshold];
+  od->name = SANE_NAME_THRESHOLD;
+  od->title = SANE_TITLE_THRESHOLD;
+  od->desc = SANE_DESC_THRESHOLD;
+  od->type = SANE_TYPE_INT;
+  od->unit = SANE_UNIT_PERCENT;
+  od->size = sizeof (SANE_Word);
+  od->cap = SANE_CAP_SOFT_DETECT | SANE_CAP_SOFT_SELECT | SANE_CAP_INACTIVE;
+  od->constraint_type = SANE_CONSTRAINT_RANGE;
+  od->constraint.range = &threshold_range;
+  chndl->val[opt_threshold].w = init_threshold;
+
+  /* opt_resolution */
+  od = &chndl->opt[opt_resolution];
+  od->name = SANE_NAME_SCAN_RESOLUTION;
+  od->title = SANE_TITLE_SCAN_RESOLUTION;
+  od->desc = SANE_DESC_SCAN_RESOLUTION;
+  od->type = SANE_TYPE_INT;
+  od->unit = SANE_UNIT_DPI;
+  od->size = sizeof (SANE_Word);
+  od->cap = SANE_CAP_SOFT_DETECT | SANE_CAP_SOFT_SELECT;
+  od->constraint_type = SANE_CONSTRAINT_WORD_LIST;
+  od->constraint.word_list = resolution_list;
+  chndl->val[opt_resolution].w = init_resolution;
+
+  /* opt_non_blocking */
+  od = &chndl->opt[opt_non_blocking];
+  od->name = "non-blocking";
+  od->title = SANE_I18N ("Use non-blocking IO");
+  od->desc = SANE_I18N ("Use non-blocking IO for sane_read() if supported "
+			"by the frontend.");
+  od->type = SANE_TYPE_BOOL;
+  od->unit = SANE_UNIT_NONE;
+  od->size = sizeof (SANE_Word);
+  od->cap = SANE_CAP_SOFT_DETECT | SANE_CAP_SOFT_SELECT | SANE_CAP_INACTIVE;
+  od->constraint_type = SANE_CONSTRAINT_NONE;
+  od->constraint.range = 0;
+  chndl->val[opt_non_blocking].w = init_non_blocking;
+
+  /* opt_geometry_group */
+  od = &chndl->opt[opt_geometry_group];
+  od->name = "";
+  od->title = SANE_I18N ("Geometry");
+  od->desc = "";
+  od->type = SANE_TYPE_GROUP;
+  od->unit = SANE_UNIT_NONE;
+  od->size = 0;
+  od->cap = 0;
+  od->constraint_type = SANE_CONSTRAINT_NONE;
+  od->constraint.range = 0;
+  chndl->val[opt_geometry_group].w = 0;
+
+  /* opt_tl_x */
+  od = &chndl->opt[opt_tl_x];
+  od->name = SANE_NAME_SCAN_TL_X;
+  od->title = SANE_TITLE_SCAN_TL_X;
+  od->desc = SANE_DESC_SCAN_TL_X;
+  od->type = SANE_TYPE_FIXED;
+  od->unit = SANE_UNIT_MM;
+  od->size = sizeof (SANE_Word);
+  od->cap = SANE_CAP_SOFT_DETECT | SANE_CAP_SOFT_SELECT;
+  od->constraint_type = SANE_CONSTRAINT_RANGE;
+  od->constraint.range = &widthRange;
+  chndl->val[opt_tl_x].w = init_tl_x;
+
+  /* opt_tl_y */
+  od = &chndl->opt[opt_tl_y];
+  od->name = SANE_NAME_SCAN_TL_Y;
+  od->title = SANE_TITLE_SCAN_TL_Y;
+  od->desc = SANE_DESC_SCAN_TL_Y;
+  od->type = SANE_TYPE_FIXED;
+  od->unit = SANE_UNIT_MM;
+  od->size = sizeof (SANE_Word);
+  od->cap = SANE_CAP_SOFT_DETECT | SANE_CAP_SOFT_SELECT;
+  od->constraint_type = SANE_CONSTRAINT_RANGE;
+  od->constraint.range = &heightRange;
+  chndl->val[opt_tl_y].w = init_tl_y;
+
+  /* opt_br_x */
+  od = &chndl->opt[opt_br_x];
+  od->name = SANE_NAME_SCAN_BR_X;
+  od->title = SANE_TITLE_SCAN_BR_X;
+  od->desc = SANE_DESC_SCAN_BR_X;
+  od->type = SANE_TYPE_FIXED;
+  od->unit = SANE_UNIT_MM;
+  od->size = sizeof (SANE_Word);
+  od->cap = SANE_CAP_SOFT_DETECT | SANE_CAP_SOFT_SELECT;
+  od->constraint_type = SANE_CONSTRAINT_RANGE;
+  od->constraint.range = &widthRange;
+  chndl->val[opt_br_x].w = init_br_x;
+
+  /* opt_br_y */
+  od = &chndl->opt[opt_br_y];
+  od->name = SANE_NAME_SCAN_BR_Y;
+  od->title = SANE_TITLE_SCAN_BR_Y;
+  od->desc = SANE_DESC_SCAN_BR_Y;
+  od->type = SANE_TYPE_FIXED;
+  od->unit = SANE_UNIT_MM;
+  od->size = sizeof (SANE_Word);
+  od->cap = SANE_CAP_SOFT_DETECT | SANE_CAP_SOFT_SELECT;
+  od->constraint_type = SANE_CONSTRAINT_RANGE;
+  od->constraint.range = &heightRange;
+  chndl->val[opt_br_y].w = init_br_y;
+
+  DBG (2, "end init_options: chndl=%p\n", (void *) chndl);
+
+  return SANE_STATUS_GOOD;
+}
+
+SANE_Status
+sane_open (SANE_String_Const devicename, SANE_Handle * handle)
+{
+  Canon_Device *dev;
+  SANE_Status status;
+  Canon_Scanner *scanner;
+
+  DBG (3, "sane_open\n");
+
+  if (devicename[0])		/* search for devicename */
+    {
+      DBG (4, "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_scanner (devicename, &dev);
+
+	  if (status != SANE_STATUS_GOOD)
+	    return status;
+	}
+    }
+  else
+    {
+      DBG (2, "sane_open: no devicename, opening first device\n");
+      dev = first_dev;
+    }
+
+  if (!dev)
+    return SANE_STATUS_INVAL;
+
+  scanner = malloc (sizeof (*scanner));
+
+  if (!scanner)
+    return SANE_STATUS_NO_MEM;
+
+  memset (scanner, 0, sizeof (*scanner));
+  scanner->device = dev;
+
+  status = CANON_open_device (&scanner->scan, dev->sane.name);
+
+  if (status != SANE_STATUS_GOOD)
+    {
+      free (scanner);
+      return status;
+    }
+
+  status = init_options (&scanner->scan);
+
+  *handle = scanner;
+
+  /* insert newly opened handle into list of open handles: */
+  scanner->next = first_handle;
+
+  first_handle = scanner;
+
+  return status;
+}
+
+static void
+print_options (CANON_Handle * chndl)
+{
+  SANE_Option_Descriptor *od;
+  SANE_Word option_number;
+  SANE_Char caps[1024];
+
+  for (option_number = 0; option_number < num_options; option_number++)
+    {
+      od = &chndl->opt[option_number];
+      DBG (50, "-----> number: %d\n", option_number);
+      DBG (50, "         name: `%s'\n", od->name);
+      DBG (50, "        title: `%s'\n", od->title);
+      DBG (50, "  description: `%s'\n", od->desc);
+      DBG (50, "         type: %s\n",
+	   od->type == SANE_TYPE_BOOL ? "SANE_TYPE_BOOL" :
+	   od->type == SANE_TYPE_INT ? "SANE_TYPE_INT" :
+	   od->type == SANE_TYPE_FIXED ? "SANE_TYPE_FIXED" :
+	   od->type == SANE_TYPE_STRING ? "SANE_TYPE_STRING" :
+	   od->type == SANE_TYPE_BUTTON ? "SANE_TYPE_BUTTON" :
+	   od->type == SANE_TYPE_GROUP ? "SANE_TYPE_GROUP" : "unknown");
+      DBG (50, "         unit: %s\n",
+	   od->unit == SANE_UNIT_NONE ? "SANE_UNIT_NONE" :
+	   od->unit == SANE_UNIT_PIXEL ? "SANE_UNIT_PIXEL" :
+	   od->unit == SANE_UNIT_BIT ? "SANE_UNIT_BIT" :
+	   od->unit == SANE_UNIT_MM ? "SANE_UNIT_MM" :
+	   od->unit == SANE_UNIT_DPI ? "SANE_UNIT_DPI" :
+	   od->unit == SANE_UNIT_PERCENT ? "SANE_UNIT_PERCENT" :
+	   od->unit == SANE_UNIT_MICROSECOND ? "SANE_UNIT_MICROSECOND" :
+	   "unknown");
+      DBG (50, "         size: %d\n", od->size);
+      caps[0] = '\0';
+      if (od->cap & SANE_CAP_SOFT_SELECT)
+	strcat (caps, "SANE_CAP_SOFT_SELECT ");
+      if (od->cap & SANE_CAP_HARD_SELECT)
+	strcat (caps, "SANE_CAP_HARD_SELECT ");
+      if (od->cap & SANE_CAP_SOFT_DETECT)
+	strcat (caps, "SANE_CAP_SOFT_DETECT ");
+      if (od->cap & SANE_CAP_EMULATED)
+	strcat (caps, "SANE_CAP_EMULATED ");
+      if (od->cap & SANE_CAP_AUTOMATIC)
+	strcat (caps, "SANE_CAP_AUTOMATIC ");
+      if (od->cap & SANE_CAP_INACTIVE)
+	strcat (caps, "SANE_CAP_INACTIVE ");
+      if (od->cap & SANE_CAP_ADVANCED)
+	strcat (caps, "SANE_CAP_ADVANCED ");
+      DBG (50, " capabilities: %s\n", caps);
+      DBG (50, "constraint type: %s\n",
+	   od->constraint_type == SANE_CONSTRAINT_NONE ?
+	   "SANE_CONSTRAINT_NONE" :
+	   od->constraint_type == SANE_CONSTRAINT_RANGE ?
+	   "SANE_CONSTRAINT_RANGE" :
+	   od->constraint_type == SANE_CONSTRAINT_WORD_LIST ?
+	   "SANE_CONSTRAINT_WORD_LIST" :
+	   od->constraint_type == SANE_CONSTRAINT_STRING_LIST ?
+	   "SANE_CONSTRAINT_STRING_LIST" : "unknown");
+      if (od->type == SANE_TYPE_INT)
+	DBG (50, "        value: %d\n", chndl->val[option_number].w);
+      else if (od->type == SANE_TYPE_FIXED)
+	DBG (50, "        value: %f\n",
+	     SANE_UNFIX (chndl->val[option_number].w));
+      else if (od->type == SANE_TYPE_STRING)
+	DBG (50, "        value: %s\n", chndl->val[option_number].s);
+    }
+}
+
+void
+sane_close (SANE_Handle handle)
+{
+  Canon_Scanner *prev, *scanner;
+  SANE_Status res;
+
+  DBG (3, "sane_close\n");
+
+  scanner = handle;
+  print_options (&scanner->scan);
+
+  if (!first_handle)
+    {
+      DBG (1, "ERROR: sane_close: no handles opened\n");
+      return;
+    }
+
+  /* remove handle from list of open handles: */
+
+  prev = NULL;
+
+  for (scanner = first_handle; scanner; scanner = scanner->next)
+    {
+      if (scanner == handle)
+	break;
+
+      prev = scanner;
+    }
+
+  if (!scanner)
+    {
+      DBG (1, "ERROR: sane_close: invalid handle %p\n", handle);
+      return;			/* oops, not a handle we know about */
+    }
+
+  if (prev)
+    prev->next = scanner->next;
+  else
+    first_handle = scanner->next;
+
+  res = CANON_close_device (&scanner->scan);
+  DBG (3, "CANON_close_device returned: %d\n", res);
+  free (scanner);
+}
+
+const SANE_Option_Descriptor *
+sane_get_option_descriptor (SANE_Handle handle, SANE_Int option)
+{
+  Canon_Scanner *scanner = handle;
+  CANON_Handle *chndl = &scanner->scan;
+
+
+  DBG (4, "sane_get_option_descriptor: handle=%p, option = %d\n",
+       (void *) handle, option);
+  if (option < 0 || option >= num_options)
+    {
+      DBG (3, "sane_get_option_descriptor: option < 0 || "
+	   "option > num_options\n");
+      return 0;
+    }
+
+  return &chndl->opt[option];
+}
+
+SANE_Status
+sane_control_option (SANE_Handle handle, SANE_Int option, SANE_Action action,
+		     void *value, SANE_Int * info)
+{
+  Canon_Scanner *scanner = handle;
+  CANON_Handle *chndl = &scanner->scan;
+
+  SANE_Int myinfo = 0;
+  SANE_Status status;
+
+  DBG (4, "sane_control_option: handle=%p, opt=%d, act=%d, val=%p, info=%p\n",
+       (void *) handle, option, action, (void *) value, (void *) info);
+
+  if (option < 0 || option >= num_options)
+    {
+      DBG (1, "sane_control_option: option < 0 || option > num_options\n");
+      return SANE_STATUS_INVAL;
+    }
+
+  if (!SANE_OPTION_IS_ACTIVE (chndl->opt[option].cap))
+    {
+      DBG (1, "sane_control_option: option is inactive\n");
+      return SANE_STATUS_INVAL;
+    }
+
+  if (chndl->opt[option].type == SANE_TYPE_GROUP)
+    {
+      DBG (1, "sane_control_option: option is a group\n");
+      return SANE_STATUS_INVAL;
+    }
+
+  switch (action)
+    {
+    case SANE_ACTION_SET_VALUE:
+      if (!SANE_OPTION_IS_SETTABLE (chndl->opt[option].cap))
+	{
+	  DBG (1, "sane_control_option: option is not setable\n");
+	  return SANE_STATUS_INVAL;
+	}
+      status = sanei_constrain_value (&chndl->opt[option], value, &myinfo);
+      if (status != SANE_STATUS_GOOD)
+	{
+	  DBG (3, "sane_control_option: sanei_constrain_value returned %s\n",
+	       sane_strstatus (status));
+	  return status;
+	}
+      switch (option)
+	{
+	case opt_tl_x:		/* Fixed with parameter reloading */
+	case opt_tl_y:
+	case opt_br_x:
+	case opt_br_y:
+	  if (chndl->val[option].w == *(SANE_Fixed *) value)
+	    {
+	      DBG (4, "sane_control_option: option %d (%s) not changed\n",
+		   option, chndl->opt[option].name);
+	      break;
+	    }
+	  chndl->val[option].w = *(SANE_Fixed *) value;
+	  myinfo |= SANE_INFO_RELOAD_PARAMS;
+	  DBG (4, "sane_control_option: set option %d (%s) to %.0f %s\n",
+	       option, chndl->opt[option].name,
+	       SANE_UNFIX (*(SANE_Fixed *) value),
+	       chndl->opt[option].unit == SANE_UNIT_MM ? "mm" : "dpi");
+	  break;
+	case opt_non_blocking:
+	  if (chndl->val[option].w == *(SANE_Bool *) value)
+	    {
+	      DBG (4, "sane_control_option: option %d (%s) not changed\n",
+		   option, chndl->opt[option].name);
+	      break;
+	    }
+	  chndl->val[option].w = *(SANE_Bool *) value;
+	  DBG (4, "sane_control_option: set option %d (%s) to %s\n",
+	       option, chndl->opt[option].name,
+	       *(SANE_Bool *) value == SANE_TRUE ? "true" : "false");
+	  break;
+	case opt_resolution:
+	case opt_threshold:
+	  if (chndl->val[option].w == *(SANE_Int *) value)
+	    {
+	      DBG (4, "sane_control_option: option %d (%s) not changed\n",
+		   option, chndl->opt[option].name);
+	      break;
+	    }
+	  chndl->val[option].w = *(SANE_Int *) value;
+	  myinfo |= SANE_INFO_RELOAD_PARAMS;
+	  myinfo |= SANE_INFO_RELOAD_OPTIONS;
+	  DBG (4, "sane_control_option: set option %d (%s) to %d\n",
+	       option, chndl->opt[option].name, *(SANE_Int *) value);
+	  break;
+	case opt_mode:
+	  if (strcmp (chndl->val[option].s, value) == 0)
+	    {
+	      DBG (4, "sane_control_option: option %d (%s) not changed\n",
+		   option, chndl->opt[option].name);
+	      break;
+	    }
+	  strcpy (chndl->val[option].s, (SANE_String) value);
+
+	  if (strcmp (chndl->val[option].s, SANE_VALUE_SCAN_MODE_LINEART) ==
+	      0)
+	    {
+	      chndl->opt[opt_threshold].cap &= ~SANE_CAP_INACTIVE;
+	      chndl->graymode = 2;
+	    }
+	  if (strcmp (chndl->val[option].s, SANE_VALUE_SCAN_MODE_COLOR) == 0)
+	    {
+	      chndl->opt[opt_threshold].cap |= SANE_CAP_INACTIVE;
+	      chndl->graymode = 0;
+	    }
+	  if (strcmp (chndl->val[option].s, SANE_VALUE_SCAN_MODE_GRAY) == 0)
+	    {
+	      chndl->opt[opt_threshold].cap |= SANE_CAP_INACTIVE;
+	      chndl->graymode = 1;
+	    }
+
+
+	  myinfo |= SANE_INFO_RELOAD_PARAMS;
+	  myinfo |= SANE_INFO_RELOAD_OPTIONS;
+	  DBG (4, "sane_control_option: set option %d (%s) to %s\n",
+	       option, chndl->opt[option].name, (SANE_String) value);
+	  break;
+	default:
+	  DBG (1, "sane_control_option: trying to set unexpected option\n");
+	  return SANE_STATUS_INVAL;
+	}
+      break;
+
+    case SANE_ACTION_GET_VALUE:
+      switch (option)
+	{
+	case opt_num_opts:
+	  *(SANE_Word *) value = num_options;
+	  DBG (4, "sane_control_option: get option 0, value = %d\n",
+	       num_options);
+	  break;
+	case opt_tl_x:		/* Fixed options */
+	case opt_tl_y:
+	case opt_br_x:
+	case opt_br_y:
+	  {
+	    *(SANE_Fixed *) value = chndl->val[option].w;
+	    DBG (4,
+		 "sane_control_option: get option %d (%s), value=%.1f %s\n",
+		 option, chndl->opt[option].name,
+		 SANE_UNFIX (*(SANE_Fixed *) value),
+		 chndl->opt[option].unit ==
+		 SANE_UNIT_MM ? "mm" : SANE_UNIT_DPI ? "dpi" : "");
+	    break;
+	  }
+	case opt_non_blocking:
+	  *(SANE_Bool *) value = chndl->val[option].w;
+	  DBG (4,
+	       "sane_control_option: get option %d (%s), value=%s\n",
+	       option, chndl->opt[option].name,
+	       *(SANE_Bool *) value == SANE_TRUE ? "true" : "false");
+	  break;
+	case opt_mode:		/* String (list) options */
+	  strcpy (value, chndl->val[option].s);
+	  DBG (4, "sane_control_option: get option %d (%s), value=`%s'\n",
+	       option, chndl->opt[option].name, (SANE_String) value);
+	  break;
+	case opt_resolution:
+	case opt_threshold:
+	  *(SANE_Int *) value = chndl->val[option].w;
+	  DBG (4, "sane_control_option: get option %d (%s), value=%d\n",
+	       option, chndl->opt[option].name, *(SANE_Int *) value);
+	  break;
+	default:
+	  DBG (1, "sane_control_option: trying to get unexpected option\n");
+	  return SANE_STATUS_INVAL;
+	}
+      break;
+    default:
+      DBG (1, "sane_control_option: trying unexpected action %d\n", action);
+      return SANE_STATUS_INVAL;
+    }
+
+  if (info)
+    *info = myinfo;
+  return SANE_STATUS_GOOD;
+}
+
+
+SANE_Status
+sane_get_parameters (SANE_Handle handle, SANE_Parameters * params)
+{
+  Canon_Scanner *hndl = handle;	/* Eliminate compiler warning */
+  CANON_Handle *chndl = &hndl->scan;
+
+  int rc = SANE_STATUS_GOOD;
+  int w = SANE_UNFIX (chndl->val[opt_br_x].w -
+		      chndl->val[opt_tl_x].w) / MM_IN_INCH *
+    chndl->val[opt_resolution].w;
+  int h =
+    SANE_UNFIX (chndl->val[opt_br_y].w -
+		chndl->val[opt_tl_y].w) / MM_IN_INCH *
+    chndl->val[opt_resolution].w;
+
+  DBG (3, "sane_get_parameters\n");
+  chndl->params.depth = 8;
+  chndl->params.last_frame = SANE_TRUE;
+  chndl->params.pixels_per_line = w;
+  chndl->params.lines = h;
+
+  if (chndl->graymode == 1)
+    {
+      chndl->params.format = SANE_FRAME_GRAY;
+      chndl->params.bytes_per_line = w;
+    }
+  else if (chndl->graymode == 2)
+    {
+      chndl->params.format = SANE_FRAME_GRAY;
+      w /= 8;
+
+      if ((chndl->params.pixels_per_line % 8) != 0)
+	w++;
+
+      chndl->params.bytes_per_line = w;
+      chndl->params.depth = 1;
+    }
+  else
+    {
+      chndl->params.format = SANE_FRAME_RGB;
+      chndl->params.bytes_per_line = w * 3;
+    }
+
+  *params = chndl->params;
+  DBG (1, "%d\n", chndl->params.format);
+  return rc;
+}
+
+
+SANE_Status
+sane_start (SANE_Handle handle)
+{
+  Canon_Scanner *scanner = handle;
+  CANON_Handle *chndl = &scanner->scan;
+  SANE_Status res;
+
+  DBG (3, "sane_start\n");
+
+  res = sane_get_parameters (handle, &chndl->params);
+  res = CANON_set_scan_parameters (&scanner->scan);
+
+  if (res != SANE_STATUS_GOOD)
+    return res;
+
+  return CANON_start_scan (&scanner->scan);
+}
+
+
+SANE_Status
+sane_read (SANE_Handle handle, SANE_Byte * data,
+	   SANE_Int max_length, SANE_Int * length)
+{
+  Canon_Scanner *scanner = handle;
+  return CANON_read (&scanner->scan, data, max_length, length);
+}
+
+
+void
+sane_cancel (SANE_Handle handle)
+{
+  DBG (3, "sane_cancel: handle = %p\n", handle);
+  DBG (3, "sane_cancel: cancelling is unsupported in this backend\n");
+}
+
+
+SANE_Status
+sane_set_io_mode (SANE_Handle handle, SANE_Bool non_blocking)
+{
+  DBG (3, "sane_set_io_mode: handle = %p, non_blocking = %d\n", handle,
+       non_blocking);
+  if (non_blocking != SANE_FALSE)
+    return SANE_STATUS_UNSUPPORTED;
+  return SANE_STATUS_GOOD;
+}
+
+
+SANE_Status
+sane_get_select_fd (SANE_Handle handle, SANE_Int * fd)
+{
+  handle = handle;		/* silence gcc */
+  fd = fd;			/* silence gcc */
+  return SANE_STATUS_UNSUPPORTED;
+}