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authorJörg Frings-Fürst <debian@jff-webhosting.net>2014-10-06 14:00:40 +0200
committerJörg Frings-Fürst <debian@jff-webhosting.net>2014-10-06 14:00:40 +0200
commit6e9c41a892ed0e0da326e0278b3221ce3f5713b8 (patch)
tree2e301d871bbeeb44aa57ff9cc070fcf3be484487 /backend/p5.c
Initial import of sane-backends version 1.0.24-1.2
Diffstat (limited to 'backend/p5.c')
-rw-r--r--backend/p5.c2048
1 files changed, 2048 insertions, 0 deletions
diff --git a/backend/p5.c b/backend/p5.c
new file mode 100644
index 0000000..30ab41e
--- /dev/null
+++ b/backend/p5.c
@@ -0,0 +1,2048 @@
+/* sane - Scanner Access Now Easy.
+
+ Copyright (C) 2009-12 Stéphane Voltz <stef.dev@free.fr>
+
+ 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.
+*/
+/* --------------------------------------------------------------------------
+
+*/
+
+/* ------------------------------------------------------------------------- */
+/*! \mainpage Primax PagePartner Parallel Port scanner Index Page
+ *
+ * \section intro_sec Introduction
+ *
+ * This backend provides support for the Prima PagePartner sheet fed parallel
+ * port scanner.
+ *
+ * \section sane_api SANE API
+ *
+ * \subsection sane_flow sane flow
+ SANE FLOW
+ - sane_init() : initialize backend, attach scanners.
+ - sane_get_devices() : query list of scanner devices, backend must
+ probe for new devices.
+ - sane_open() : open a particular scanner device, adding a handle
+ to the opened device
+ - sane_set_io_mode() : set blocking mode
+ - sane_get_select_fd() : get scanner 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 for the ongoing scan
+ - sane_read() : read image data
+ - sane_cancel() : cancel operation, end scan
+ - sane_close() : close opened scanner device, freeing scanner handle
+ - sane_exit() : terminate use of backend, freeing all resources for attached
+ devices when last frontend quits
+ */
+
+/**
+ * the build number allow to know which version of the backend is running.
+ */
+#define BUILD 2301
+
+#include "p5.h"
+
+/**
+ * Import directly the low level part needed to
+ * operate scanner. The alternative is to prefix all public functions
+ * with sanei_p5_ ,and have all the functions prototyped in
+ * p5_device.h .
+ */
+#include "p5_device.c"
+
+/**
+ * number of time the backend has been loaded by sane_init.
+ */
+static int init_count = 0;
+
+/**
+ * NULL terminated list of opened frontend sessions. Sessions are
+ * inserted here on sane_open() and removed on sane_close().
+ */
+static P5_Session *sessions = NULL;
+
+/**
+ * NULL terminated list of detected physical devices.
+ * The same device may be opened several time by different sessions.
+ * Entry are inserted here by the attach() function.
+ * */
+static P5_Device *devices = NULL;
+
+/**
+ * NULL terminated list of devices needed by sane_get_devices(), since
+ * the result returned must stay consistent until next call.
+ */
+static const SANE_Device **devlist = 0;
+
+/**
+ * list of possible color modes
+ */
+static SANE_String_Const mode_list[] = {
+ SANE_I18N (COLOR_MODE),
+ SANE_I18N (GRAY_MODE),
+ /* SANE_I18N (LINEART_MODE), not supported yet */
+ 0
+};
+
+static SANE_Range x_range = {
+ SANE_FIX (0.0), /* minimum */
+ SANE_FIX (216.0), /* maximum */
+ SANE_FIX (0.0) /* quantization */
+};
+
+static SANE_Range y_range = {
+ SANE_FIX (0.0), /* minimum */
+ SANE_FIX (299.0), /* maximum */
+ SANE_FIX (0.0) /* no quantization */
+};
+
+static const SANE_Range u8_range = {
+ 0, /* minimum */
+ 255, /* maximum */
+ 0 /* no quantization */
+};
+
+static const SANE_Range threshold_percentage_range = {
+ SANE_FIX (0), /* minimum */
+ SANE_FIX (100), /* maximum */
+ SANE_FIX (1) /* quantization */
+};
+
+/**
+ * finds the maximum string length in a string array.
+ */
+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;
+}
+
+/**> placeholders for decoded configuration values */
+static P5_Config p5cfg;
+
+
+/* ------------------------------------------------------------------------- */
+
+/*
+ * SANE Interface
+ */
+
+
+/**
+ * Called by SANE initially.
+ *
+ * From the SANE spec:
+ * This function must be called before any other SANE function can be
+ * called. The behavior of a SANE backend is undefined if this
+ * function is not called first. The version code of the backend is
+ * returned in the value pointed to by version_code. If that pointer
+ * is NULL, no version code is returned. Argument authorize is either
+ * a pointer to a function that is invoked when the backend requires
+ * authentication for a specific resource or NULL if the frontend does
+ * not support authentication.
+ */
+SANE_Status
+sane_init (SANE_Int * version_code, SANE_Auth_Callback authorize)
+{
+ SANE_Status status;
+
+ authorize = authorize; /* get rid of compiler warning */
+
+ init_count++;
+
+ /* init backend debug */
+ DBG_INIT ();
+ DBG (DBG_info, "SANE P5 backend version %d.%d-%d\n",
+ SANE_CURRENT_MAJOR, V_MINOR, BUILD);
+ DBG (DBG_proc, "sane_init: start\n");
+ DBG (DBG_trace, "sane_init: init_count=%d\n", init_count);
+
+ if (version_code)
+ *version_code = SANE_VERSION_CODE (SANE_CURRENT_MAJOR, V_MINOR, BUILD);
+
+ /* cold-plugging case : probe for already plugged devices */
+ status = probe_p5_devices ();
+
+ DBG (DBG_proc, "sane_init: exit\n");
+ return status;
+}
+
+
+/**
+ * Called by SANE to find out about supported devices.
+ *
+ * From the SANE spec:
+ * This function can be used to query the list of devices that are
+ * available. If the function executes successfully, it stores a
+ * pointer to a NULL terminated array of pointers to SANE_Device
+ * structures in *device_list. The returned list is guaranteed to
+ * remain unchanged and valid until (a) another call to this function
+ * is performed or (b) a call to sane_exit() is performed. This
+ * function can be called repeatedly to detect when new devices become
+ * available. If argument local_only is true, only local devices are
+ * returned (devices directly attached to the machine that SANE is
+ * running on). If it is false, the device list includes all remote
+ * devices that are accessible to the SANE library.
+ *
+ * SANE does not require that this function is called before a
+ * sane_open() call is performed. A device name may be specified
+ * explicitly by a user which would make it unnecessary and
+ * undesirable to call this function first.
+ * @param device_list pointer where to store the device list
+ * @param local_only SANE_TRUE if only local devices are required.
+ * @return SANE_STATUS_GOOD when successfull
+ */
+SANE_Status
+sane_get_devices (const SANE_Device *** device_list, SANE_Bool local_only)
+{
+ int dev_num, devnr;
+ struct P5_Device *device;
+ SANE_Device *sane_device;
+ int i;
+
+ DBG (DBG_proc, "sane_get_devices: start: local_only = %s\n",
+ local_only == SANE_TRUE ? "true" : "false");
+
+ /* free existing devlist first */
+ if (devlist)
+ {
+ for (i = 0; devlist[i] != NULL; i++)
+ free ((void *)devlist[i]);
+ free (devlist);
+ devlist = NULL;
+ }
+
+ /**
+ * Since sane_get_devices() may be called repeatedly to detect new devices,
+ * the device detection must be run at each call. We are handling
+ * hot-plugging : we probe for devices plugged since sane_init() was called.
+ */
+ probe_p5_devices ();
+
+ /* if no devices detected, just return an empty list */
+ if (devices == NULL)
+ {
+ devlist = malloc (sizeof (devlist[0]));
+ if (!devlist)
+ return SANE_STATUS_NO_MEM;
+ devlist[0] = NULL;
+ *device_list = devlist;
+ DBG (DBG_proc, "sane_get_devices: exit with no device\n");
+ return SANE_STATUS_GOOD;
+ }
+
+ /* count physical devices */
+ devnr = 1;
+ device = devices;
+ while (device->next)
+ {
+ devnr++;
+ device = device->next;
+ }
+
+ /* allocate room for the list, plus 1 for the NULL terminator */
+ devlist = malloc ((devnr + 1) * sizeof (devlist[0]));
+ if (!devlist)
+ return SANE_STATUS_NO_MEM;
+
+ *device_list = devlist;
+
+ dev_num = 0;
+ device = devices;
+
+ /* we build a list of SANE_Device from the list of attached devices */
+ for (i = 0; i < devnr; i++)
+ {
+ /* add device according to local only flag */
+ if ((local_only == SANE_TRUE && device->local == SANE_TRUE)
+ || local_only == SANE_FALSE)
+ {
+ /* allocate memory to add the device */
+ sane_device = malloc (sizeof (*sane_device));
+ if (!sane_device)
+ {
+ return SANE_STATUS_NO_MEM;
+ }
+
+ /* copy data */
+ sane_device->name = device->name;
+ sane_device->vendor = device->model->vendor;
+ sane_device->model = device->model->product;
+ sane_device->type = device->model->type;
+ devlist[dev_num] = sane_device;
+
+ /* increment device counter */
+ dev_num++;
+ }
+
+ /* go to next detected device */
+ device = device->next;
+ }
+ devlist[dev_num] = 0;
+
+ *device_list = devlist;
+
+ DBG (DBG_proc, "sane_get_devices: exit\n");
+
+ return SANE_STATUS_GOOD;
+}
+
+
+/**
+ * Called to establish connection with the session. This function will
+ * also establish meaningful defaults and initialize the options.
+ *
+ * From the SANE spec:
+ * This function is used to establish a connection to a particular
+ * device. The name of the device to be opened is passed in argument
+ * name. If the call completes successfully, a handle for the device
+ * is returned in *h. As a special case, specifying a zero-length
+ * string as the device requests opening the first available device
+ * (if there is such a device). Another special case is to only give
+ * the name of the backend as the device name, in this case the first
+ * available device will also be used.
+ * @param name name of the device to open
+ * @param handle opaque pointer where to store the pointer of
+ * the opened P5_Session
+ * @return SANE_STATUS_GOOD on success
+ */
+SANE_Status
+sane_open (SANE_String_Const name, SANE_Handle * handle)
+{
+ struct P5_Session *session = NULL;
+ struct P5_Device *device = NULL;
+
+ DBG (DBG_proc, "sane_open: start (devicename=%s)\n", name);
+
+ /* check there is at least a device */
+ if (devices == NULL)
+ {
+ DBG (DBG_proc, "sane_open: exit, no device to open!\n");
+ return SANE_STATUS_INVAL;
+ }
+
+ if (name[0] == 0 || strncmp (name, "p5", strlen ("p5")) == 0)
+ {
+ DBG (DBG_info,
+ "sane_open: no specific device requested, using default\n");
+ if (devices)
+ {
+ device = devices;
+ DBG (DBG_info, "sane_open: device %s used as default device\n",
+ device->name);
+ }
+ }
+ else
+ {
+ DBG (DBG_info, "sane_open: device %s requested\n", name);
+ /* walk the device list until we find a matching name */
+ device = devices;
+ while (device && strcmp (device->name, name) != 0)
+ {
+ DBG (DBG_trace, "sane_open: device %s doesn't match\n",
+ device->name);
+ device = device->next;
+ }
+ }
+
+ /* check wether we have found a match or reach the end of the device list */
+ if (!device)
+ {
+ DBG (DBG_info, "sane_open: no device found\n");
+ return SANE_STATUS_INVAL;
+ }
+
+ /* now we have a device, duplicate it and return it in handle */
+ DBG (DBG_info, "sane_open: device %s found\n", name);
+
+ /* device initialization */
+ if (device->initialized == SANE_FALSE)
+ {
+ /**
+ * call to hardware initialization function here.
+ */
+ device->fd = open_pp (device->name);
+ if (device->fd < 0)
+ {
+ DBG (DBG_error, "sane_open: failed to open '%s' device!\n",
+ device->name);
+ return SANE_STATUS_INVAL;
+ }
+
+ /* now try to connect to scanner */
+ if (connect (device->fd) != SANE_TRUE)
+ {
+ DBG (DBG_error, "sane_open: failed to connect!\n");
+ close_pp (device->fd);
+ return SANE_STATUS_INVAL;
+ }
+
+ /* load calibration data */
+ restore_calibration (device);
+
+ /* device link is OK now */
+ device->initialized = SANE_TRUE;
+ }
+ device->buffer = NULL;
+ device->gain = NULL;
+ device->offset = NULL;
+
+ /* prepare handle to return */
+ session = (P5_Session *) malloc (sizeof (P5_Session));
+ if (session == NULL)
+ {
+ DBG (DBG_proc, "sane_open: exit OOM\n");
+ return SANE_STATUS_NO_MEM;
+ }
+
+ /* initalize session */
+ session->dev = device;
+ session->scanning = SANE_FALSE;
+ session->non_blocking = SANE_FALSE;
+
+ /* initialize SANE options for this session */
+ init_options (session);
+
+ /* add the handle to the linked list of sessions */
+ session->next = sessions;
+ sessions = session;
+
+ /* store result */
+ *handle = session;
+
+ /* exit success */
+ DBG (DBG_proc, "sane_open: exit\n");
+ return SANE_STATUS_GOOD;
+}
+
+
+/**
+ * Set non blocking mode. In this mode, read return immediatly when
+ * no data is available whithin sane_read(), instead of polling the scanner.
+ */
+SANE_Status
+sane_set_io_mode (SANE_Handle handle, SANE_Bool non_blocking)
+{
+ P5_Session *session = (P5_Session *) handle;
+
+ DBG (DBG_proc, "sane_set_io_mode: start\n");
+ if (session->scanning != SANE_TRUE)
+ {
+ DBG (DBG_error, "sane_set_io_mode: called out of a scan\n");
+ return SANE_STATUS_INVAL;
+ }
+ session->non_blocking = non_blocking;
+ DBG (DBG_info, "sane_set_io_mode: I/O mode set to %sblocking.\n",
+ non_blocking ? "non " : " ");
+ DBG (DBG_proc, "sane_set_io_mode: exit\n");
+ return SANE_STATUS_GOOD;
+}
+
+
+/**
+ * An advanced method we don't support but have to define. At SANE API
+ * level this function is meant to provide a file descriptor on which the
+ * frontend can do select()/poll() to wait for data.
+ */
+SANE_Status
+sane_get_select_fd (SANE_Handle handle, SANE_Int * fdp)
+{
+ /* make compiler happy ... */
+ handle = handle;
+ fdp = fdp;
+
+ DBG (DBG_proc, "sane_get_select_fd: start\n");
+ DBG (DBG_warn, "sane_get_select_fd: unsupported ...\n");
+ DBG (DBG_proc, "sane_get_select_fd: exit\n");
+ return SANE_STATUS_UNSUPPORTED;
+}
+
+
+/**
+ * Returns the options we know.
+ *
+ * From the SANE spec:
+ * This function is used to access option descriptors. The function
+ * returns the option descriptor for option number n of the device
+ * represented by handle h. Option number 0 is guaranteed to be a
+ * valid option. Its value is an integer that specifies the number of
+ * options that are available for device handle h (the count includes
+ * option 0). If n is not a valid option index, the function returns
+ * NULL. The returned option descriptor is guaranteed to remain valid
+ * (and at the returned address) until the device is closed.
+ */
+const SANE_Option_Descriptor *
+sane_get_option_descriptor (SANE_Handle handle, SANE_Int option)
+{
+ struct P5_Session *session = handle;
+
+ DBG (DBG_proc, "sane_get_option_descriptor: start\n");
+
+ if ((unsigned) option >= NUM_OPTIONS)
+ return NULL;
+
+ DBG (DBG_info, "sane_get_option_descriptor: \"%s\"\n",
+ session->options[option].descriptor.name);
+
+ DBG (DBG_proc, "sane_get_option_descriptor: exit\n");
+ return &(session->options[option].descriptor);
+}
+
+/**
+ * sets automatic value for an option , called by sane_control_option after
+ * all checks have been done */
+static SANE_Status
+set_automatic_value (P5_Session * s, int option, SANE_Int * myinfo)
+{
+ SANE_Status status = SANE_STATUS_GOOD;
+ SANE_Int i, min;
+ SANE_Word *dpi_list;
+
+ switch (option)
+ {
+ case OPT_TL_X:
+ s->options[OPT_TL_X].value.w = x_range.min;
+ *myinfo |= SANE_INFO_RELOAD_PARAMS;
+ break;
+ case OPT_TL_Y:
+ s->options[OPT_TL_Y].value.w = y_range.min;
+ *myinfo |= SANE_INFO_RELOAD_PARAMS;
+ break;
+ case OPT_BR_X:
+ s->options[OPT_BR_X].value.w = x_range.max;
+ *myinfo |= SANE_INFO_RELOAD_PARAMS;
+ break;
+ case OPT_BR_Y:
+ s->options[OPT_BR_Y].value.w = y_range.max;
+ *myinfo |= SANE_INFO_RELOAD_PARAMS;
+ break;
+ case OPT_RESOLUTION:
+ /* we set up to the lowest available dpi value */
+ dpi_list =
+ (SANE_Word *) s->options[OPT_RESOLUTION].descriptor.constraint.
+ word_list;
+ min = 65536;
+ for (i = 1; i < dpi_list[0]; i++)
+ {
+ if (dpi_list[i] < min)
+ min = dpi_list[i];
+ }
+ s->options[OPT_RESOLUTION].value.w = min;
+ *myinfo |= SANE_INFO_RELOAD_PARAMS;
+ break;
+ case OPT_PREVIEW:
+ s->options[OPT_PREVIEW].value.w = SANE_FALSE;
+ *myinfo |= SANE_INFO_RELOAD_PARAMS;
+ break;
+ case OPT_MODE:
+ if (s->options[OPT_MODE].value.s)
+ free (s->options[OPT_MODE].value.s);
+ s->options[OPT_MODE].value.s = strdup (mode_list[0]);
+ *myinfo |= SANE_INFO_RELOAD_OPTIONS;
+ *myinfo |= SANE_INFO_RELOAD_PARAMS;
+ break;
+ default:
+ DBG (DBG_warn, "set_automatic_value: can't set unknown option %d\n",
+ option);
+ }
+
+ return status;
+}
+
+/**
+ * sets an option , called by sane_control_option after all
+ * checks have been done */
+static SANE_Status
+set_option_value (P5_Session * s, int option, void *val, SANE_Int * myinfo)
+{
+ SANE_Status status = SANE_STATUS_GOOD;
+ SANE_Word tmpw;
+
+ switch (option)
+ {
+ case OPT_TL_X:
+ case OPT_BR_X:
+ case OPT_TL_Y:
+ case OPT_BR_Y:
+ s->options[option].value.w = *(SANE_Word *) val;
+ /* we ensure geometry is coherent */
+ /* this happens when user drags TL corner right or below the BR point */
+ if (s->options[OPT_BR_Y].value.w < s->options[OPT_TL_Y].value.w)
+ {
+ tmpw = s->options[OPT_BR_Y].value.w;
+ s->options[OPT_BR_Y].value.w = s->options[OPT_TL_Y].value.w;
+ s->options[OPT_TL_Y].value.w = tmpw;
+ }
+ if (s->options[OPT_BR_X].value.w < s->options[OPT_TL_X].value.w)
+ {
+ tmpw = s->options[OPT_BR_X].value.w;
+ s->options[OPT_BR_X].value.w = s->options[OPT_TL_X].value.w;
+ s->options[OPT_TL_X].value.w = tmpw;
+ }
+
+ *myinfo |= SANE_INFO_RELOAD_PARAMS;
+ break;
+
+ case OPT_RESOLUTION:
+ case OPT_PREVIEW:
+ s->options[option].value.w = *(SANE_Word *) val;
+ *myinfo |= SANE_INFO_RELOAD_PARAMS;
+ break;
+
+ case OPT_MODE:
+ if (s->options[option].value.s)
+ free (s->options[option].value.s);
+ s->options[option].value.s = strdup (val);
+ *myinfo |= SANE_INFO_RELOAD_PARAMS | SANE_INFO_RELOAD_OPTIONS;
+ break;
+
+ case OPT_CALIBRATE:
+ status = sheetfed_calibration (s->dev);
+ *myinfo |= SANE_INFO_RELOAD_OPTIONS;
+ break;
+
+ case OPT_CLEAR_CALIBRATION:
+ cleanup_calibration (s->dev);
+ *myinfo |= SANE_INFO_RELOAD_OPTIONS;
+ break;
+
+ default:
+ DBG (DBG_warn, "set_option_value: can't set unknown option %d\n",
+ option);
+ }
+ return status;
+}
+
+/**
+ * gets an option , called by sane_control_option after all checks
+ * have been done */
+static SANE_Status
+get_option_value (P5_Session * s, int option, void *val)
+{
+ SANE_Status status;
+
+ switch (option)
+ {
+ /* word or word equivalent options: */
+ case OPT_NUM_OPTS:
+ case OPT_RESOLUTION:
+ case OPT_PREVIEW:
+ case OPT_TL_X:
+ case OPT_TL_Y:
+ case OPT_BR_X:
+ case OPT_BR_Y:
+ *(SANE_Word *) val = s->options[option].value.w;
+ break;
+
+ /* string options: */
+ case OPT_MODE:
+ strcpy (val, s->options[option].value.s);
+ break;
+
+ /* sensor options */
+ case OPT_PAGE_LOADED_SW:
+ status = test_document (s->dev->fd);
+ if (status == SANE_STATUS_GOOD)
+ s->options[option].value.b = SANE_TRUE;
+ else
+ s->options[option].value.b = SANE_FALSE;
+ *(SANE_Bool *) val = s->options[option].value.b;
+ break;
+
+ case OPT_NEED_CALIBRATION_SW:
+ *(SANE_Bool *) val = !s->dev->calibrated;
+ break;
+
+
+ /* unhandled options */
+ default:
+ DBG (DBG_warn, "get_option_value: can't get unknown option %d\n",
+ option);
+ }
+
+ return SANE_STATUS_GOOD;
+}
+
+/**
+ * Gets or sets an option value.
+ *
+ * From the SANE spec:
+ * This function is used to set or inquire the current value of option
+ * number n of the device represented by handle h. The manner in which
+ * the option is controlled is specified by parameter action. The
+ * possible values of this parameter are described in more detail
+ * below. The value of the option is passed through argument val. It
+ * is a pointer to the memory that holds the option value. The memory
+ * area pointed to by v must be big enough to hold the entire option
+ * value (determined by member size in the corresponding option
+ * descriptor).
+ *
+ * The only exception to this rule is that when setting the value of a
+ * string option, the string pointed to by argument v may be shorter
+ * since the backend will stop reading the option value upon
+ * encountering the first NUL terminator in the string. If argument i
+ * is not NULL, the value of *i will be set to provide details on how
+ * well the request has been met.
+ * action is SANE_ACTION_GET_VALUE, SANE_ACTION_SET_VALUE or SANE_ACTION_SET_AUTO
+ */
+SANE_Status
+sane_control_option (SANE_Handle handle, SANE_Int option,
+ SANE_Action action, void *val, SANE_Int * info)
+{
+ P5_Session *s = handle;
+ SANE_Status status;
+ SANE_Word cap;
+ SANE_Int myinfo = 0;
+
+ DBG (DBG_io2,
+ "sane_control_option: start: action = %s, option = %s (%d)\n",
+ (action == SANE_ACTION_GET_VALUE) ? "get" : (action ==
+ SANE_ACTION_SET_VALUE) ?
+ "set" : (action == SANE_ACTION_SET_AUTO) ? "set_auto" : "unknown",
+ s->options[option].descriptor.name, option);
+
+ if (info)
+ *info = 0;
+
+ /* do checks before trying to apply action */
+
+ if (s->scanning)
+ {
+ DBG (DBG_warn, "sane_control_option: don't call this function while "
+ "scanning (option = %s (%d))\n",
+ s->options[option].descriptor.name, option);
+ return SANE_STATUS_DEVICE_BUSY;
+ }
+
+ /* option must be within existing range */
+ if (option >= NUM_OPTIONS || option < 0)
+ {
+ DBG (DBG_warn,
+ "sane_control_option: option %d >= NUM_OPTIONS || option < 0\n",
+ option);
+ return SANE_STATUS_INVAL;
+ }
+
+ /* don't access an inactive option */
+ cap = s->options[option].descriptor.cap;
+ if (!SANE_OPTION_IS_ACTIVE (cap))
+ {
+ DBG (DBG_warn, "sane_control_option: option %d is inactive\n", option);
+ return SANE_STATUS_INVAL;
+ }
+
+ /* now checks have been done, apply action */
+ switch (action)
+ {
+ case SANE_ACTION_GET_VALUE:
+ status = get_option_value (s, option, val);
+ break;
+
+ case SANE_ACTION_SET_VALUE:
+ if (!SANE_OPTION_IS_SETTABLE (cap))
+ {
+ DBG (DBG_warn, "sane_control_option: option %d is not settable\n",
+ option);
+ return SANE_STATUS_INVAL;
+ }
+
+ status =
+ sanei_constrain_value (&s->options[option].descriptor, val, &myinfo);
+ if (status != SANE_STATUS_GOOD)
+ {
+ DBG (DBG_warn,
+ "sane_control_option: sanei_constrain_value returned %s\n",
+ sane_strstatus (status));
+ return status;
+ }
+
+ /* return immediatly if no change */
+ if (s->options[option].descriptor.type == SANE_TYPE_INT
+ && *(SANE_Word *) val == s->options[option].value.w)
+ {
+ status = SANE_STATUS_GOOD;
+ }
+ else
+ { /* apply change */
+ status = set_option_value (s, option, val, &myinfo);
+ }
+ break;
+
+ case SANE_ACTION_SET_AUTO:
+ /* sets automatic values */
+ if (!(cap & SANE_CAP_AUTOMATIC))
+ {
+ DBG (DBG_warn,
+ "sane_control_option: option %d is not autosettable\n",
+ option);
+ return SANE_STATUS_INVAL;
+ }
+
+ status = set_automatic_value (s, option, &myinfo);
+ break;
+
+ default:
+ DBG (DBG_error, "sane_control_option: invalid action %d\n", action);
+ status = SANE_STATUS_INVAL;
+ break;
+ }
+
+ if (info)
+ *info = myinfo;
+
+ DBG (DBG_io2, "sane_control_option: exit\n");
+ return status;
+}
+
+/**
+ * Called by SANE when a page acquisition operation is to be started.
+ * @param handle opaque handle to a frontend session
+ * @return SANE_STATUS_GOOD on success, SANE_STATUS_BUSY if the device is
+ * in use by another session or SANE_STATUS_WARMING_UP if the device is
+ * warming up. In this case the fronted as to call sane_start again until
+ * warming up is done. Any other values returned are error status.
+ */
+SANE_Status
+sane_start (SANE_Handle handle)
+{
+ struct P5_Session *session = handle;
+ int status = SANE_STATUS_GOOD;
+ P5_Device *dev = session->dev;
+
+ DBG (DBG_proc, "sane_start: start\n");
+
+ /* if already scanning, tell we're busy */
+ if (session->scanning == SANE_TRUE)
+ {
+ DBG (DBG_info, "sane_start: device is already scanning\n");
+ return SANE_STATUS_DEVICE_BUSY;
+ }
+
+ /* check that the device has been initialized */
+ if (dev->initialized == SANE_FALSE)
+ {
+ DBG (DBG_error, "sane_start: device is not initialized\n");
+ return SANE_STATUS_INVAL;
+ }
+
+ /* check if there is a document */
+ status = test_document (dev->fd);
+ if (status != SANE_STATUS_GOOD)
+ {
+ DBG (DBG_error, "sane_start: device is already scanning\n");
+ return status;
+ }
+
+ /* we compute all the scan parameters so that */
+ /* we will be able to set up the registers correctly */
+ compute_parameters (session);
+
+ /* move to scan area if needed */
+ if (dev->ystart > 0)
+ {
+ status = move (dev);
+ if (status != SANE_STATUS_GOOD)
+ {
+ DBG (DBG_error, "sane_start: failed to move to scan area\n");
+ return SANE_STATUS_INVAL;
+ }
+ }
+
+ /* send scan command */
+ status = start_scan (dev, dev->mode, dev->ydpi, dev->xstart, dev->pixels);
+ if (status != SANE_STATUS_GOOD)
+ {
+ DBG (DBG_error, "sane_start: failed to start scan\n");
+ return SANE_STATUS_INVAL;
+ }
+
+ /* allocates work buffer */
+ if (dev->buffer != NULL)
+ {
+ free (dev->buffer);
+ }
+
+ dev->position = 0;
+ dev->top = 0;
+ /* compute amount of lines needed for lds correction */
+ dev->bottom = dev->bytes_per_line * 2 * dev->lds;
+ /* computes buffer size, 66 color lines plus eventual amount needed for lds */
+ dev->size = dev->pixels * 3 * 66 + dev->bottom;
+ dev->buffer = (uint8_t *) malloc (dev->size);
+ if (dev->buffer == NULL)
+ {
+ DBG (DBG_error, "sane_start: failed to allocate %lu bytes\n", (unsigned long)dev->size);
+ sane_cancel (handle);
+ return SANE_STATUS_NO_MEM;
+ }
+
+ /* return now the scan has been initiated */
+ session->scanning = SANE_TRUE;
+ session->sent = 0;
+
+ DBG (DBG_io, "sane_start: to_send=%d\n", session->to_send);
+ DBG (DBG_io, "sane_start: size=%lu\n", (unsigned long)dev->size);
+ DBG (DBG_io, "sane_start: top=%lu\n", (unsigned long)dev->top);
+ DBG (DBG_io, "sane_start: bottom=%lu\n", (unsigned long)dev->bottom);
+ DBG (DBG_io, "sane_start: position=%lu\n", (unsigned long)dev->position);
+
+ DBG (DBG_proc, "sane_start: exit\n");
+ return status;
+}
+
+/** @brief compute scan parameters
+ * This function computes two set of parameters. The one for the SANE's standard
+ * and the other for the hardware. Among these parameters are the bit depth, total
+ * number of lines, total number of columns, extra line to read for data reordering...
+ * @param session fronted session to compute final scan parameters
+ * @return SANE_STATUS_GOOD on success
+ */
+static SANE_Status
+compute_parameters (P5_Session * session)
+{
+ P5_Device *dev = session->dev;
+ SANE_Int dpi; /* dpi for scan */
+ SANE_String mode;
+ SANE_Status status = SANE_STATUS_GOOD;
+
+ int tl_x, tl_y, br_x, br_y;
+
+ mode = session->options[OPT_MODE].value.s;
+ dpi = session->options[OPT_RESOLUTION].value.w;
+
+ /* scan coordinates */
+ tl_x = SANE_UNFIX (session->options[OPT_TL_X].value.w);
+ tl_y = SANE_UNFIX (session->options[OPT_TL_Y].value.w);
+ br_x = SANE_UNFIX (session->options[OPT_BR_X].value.w);
+ br_y = SANE_UNFIX (session->options[OPT_BR_Y].value.w);
+
+ /* only single pass scanning supported */
+ session->params.last_frame = SANE_TRUE;
+
+ /* gray modes */
+ if (strcmp (mode, GRAY_MODE) == 0)
+ {
+ session->params.format = SANE_FRAME_GRAY;
+ dev->mode = MODE_GRAY;
+ dev->lds = 0;
+ }
+ else if (strcmp (mode, LINEART_MODE) == 0)
+ {
+ session->params.format = SANE_FRAME_GRAY;
+ dev->mode = MODE_LINEART;
+ dev->lds = 0;
+ }
+ else
+ {
+ /* Color */
+ session->params.format = SANE_FRAME_RGB;
+ dev->mode = MODE_COLOR;
+ dev->lds = (dev->model->lds * dpi) / dev->model->max_ydpi;
+ }
+
+ /* SANE level values */
+ session->params.lines = ((br_y - tl_y) * dpi) / MM_PER_INCH;
+ if (session->params.lines == 0)
+ session->params.lines = 1;
+ session->params.pixels_per_line = ((br_x - tl_x) * dpi) / MM_PER_INCH;
+ if (session->params.pixels_per_line == 0)
+ session->params.pixels_per_line = 1;
+
+ DBG (DBG_data, "compute_parameters: pixels_per_line =%d\n",
+ session->params.pixels_per_line);
+
+ if (strcmp (mode, LINEART_MODE) == 0)
+ {
+ session->params.depth = 1;
+ /* in lineart, having pixels multiple of 8 avoids a costly test */
+ /* at each bit to see we must go to the next byte */
+ /* TODO : implement this requirement in sane_control_option */
+ session->params.pixels_per_line =
+ ((session->params.pixels_per_line + 7) / 8) * 8;
+ }
+ else
+ session->params.depth = 8;
+
+ /* width needs to be even */
+ if (session->params.pixels_per_line & 1)
+ session->params.pixels_per_line++;
+
+ /* Hardware settings : they can differ from the ones at SANE level */
+ /* for instance the effective DPI used by a sensor may be higher */
+ /* than the one needed for the SANE scan parameters */
+ dev->lines = session->params.lines;
+ dev->pixels = session->params.pixels_per_line;
+
+ /* motor and sensor DPI */
+ dev->xdpi = dpi;
+ dev->ydpi = dpi;
+
+ /* handle bounds of motor's dpi range */
+ if (dev->ydpi > dev->model->max_ydpi)
+ {
+ dev->ydpi = dev->model->max_ydpi;
+ dev->lines = (dev->lines * dev->model->max_ydpi) / dpi;
+ if (dev->lines == 0)
+ dev->lines = 1;
+
+ /* round number of lines */
+ session->params.lines =
+ (session->params.lines / dev->lines) * dev->lines;
+ if (session->params.lines == 0)
+ session->params.lines = 1;
+ }
+ if (dev->ydpi < dev->model->min_ydpi)
+ {
+ dev->ydpi = dev->model->min_ydpi;
+ dev->lines = (dev->lines * dev->model->min_ydpi) / dpi;
+ }
+
+ /* hardware values */
+ dev->xstart =
+ ((SANE_UNFIX (dev->model->x_offset) + tl_x) * dpi) / MM_PER_INCH;
+ dev->ystart =
+ ((SANE_UNFIX (dev->model->y_offset) + tl_y) * dev->ydpi) / MM_PER_INCH;
+
+ /* take lds correction into account when moving to scan area */
+ if (dev->ystart > 2 * dev->lds)
+ dev->ystart -= 2 * dev->lds;
+
+
+ /* computes bytes per line */
+ session->params.bytes_per_line = session->params.pixels_per_line;
+ dev->bytes_per_line = dev->pixels;
+ if (session->params.format == SANE_FRAME_RGB)
+ {
+ dev->bytes_per_line *= 3;
+ }
+
+ /* in lineart mode we adjust bytes_per_line needed by frontend */
+ /* we do that here because we needed sent/to_send to be as if */
+ /* there was no lineart */
+ if (session->params.depth == 1)
+ {
+ session->params.bytes_per_line =
+ (session->params.bytes_per_line + 7) / 8;
+ }
+
+ session->params.bytes_per_line = dev->bytes_per_line;
+ session->to_send = session->params.bytes_per_line * session->params.lines;
+ session->params.bytes_per_line = dev->bytes_per_line;
+
+ DBG (DBG_data, "compute_parameters: bytes_per_line =%d\n",
+ session->params.bytes_per_line);
+ DBG (DBG_data, "compute_parameters: depth =%d\n",
+ session->params.depth);
+ DBG (DBG_data, "compute_parameters: lines =%d\n",
+ session->params.lines);
+ DBG (DBG_data, "compute_parameters: image size =%d\n",
+ session->to_send);
+
+ DBG (DBG_data, "compute_parameters: xstart =%d\n", dev->xstart);
+ DBG (DBG_data, "compute_parameters: ystart =%d\n", dev->ystart);
+ DBG (DBG_data, "compute_parameters: dev lines =%d\n", dev->lines);
+ DBG (DBG_data, "compute_parameters: dev bytes per line=%d\n",
+ dev->bytes_per_line);
+ DBG (DBG_data, "compute_parameters: dev pixels =%d\n", dev->pixels);
+ DBG (DBG_data, "compute_parameters: lds =%d\n", dev->lds);
+
+ return status;
+}
+
+
+/**
+ * Called by SANE to retrieve information about the type of data
+ * that the current scan will return.
+ *
+ * From the SANE spec:
+ * This function is used to obtain the current scan parameters. The
+ * returned parameters are guaranteed to be accurate between the time
+ * a scan has been started (sane_start() has been called) and the
+ * completion of that request. Outside of that window, the returned
+ * values are best-effort estimates of what the parameters will be
+ * when sane_start() gets invoked.
+ *
+ * Calling this function before a scan has actually started allows,
+ * for example, to get an estimate of how big the scanned image will
+ * be. The parameters passed to this function are the handle of the
+ * device for which the parameters should be obtained and a pointer
+ * to a parameter structure.
+ */
+SANE_Status
+sane_get_parameters (SANE_Handle handle, SANE_Parameters * params)
+{
+ SANE_Status status;
+ struct P5_Session *session = (struct P5_Session *) handle;
+
+ DBG (DBG_proc, "sane_get_parameters: start\n");
+
+ /* call parameters computing function */
+ status = compute_parameters (session);
+ if (status == SANE_STATUS_GOOD && params)
+ *params = session->params;
+
+ DBG (DBG_proc, "sane_get_parameters: exit\n");
+ return status;
+}
+
+
+/**
+ * Called by SANE to read data.
+ *
+ * From the SANE spec:
+ * This function is used to read image data from the device
+ * represented by handle h. Argument buf is a pointer to a memory
+ * area that is at least maxlen bytes long. The number of bytes
+ * returned is stored in *len. A backend must set this to zero when
+ * the call fails (i.e., when a status other than SANE_STATUS_GOOD is
+ * returned).
+ *
+ * When the call succeeds, the number of bytes returned can be
+ * anywhere in the range from 0 to maxlen bytes.
+ *
+ * Returned data is read from working buffer.
+ */
+SANE_Status
+sane_read (SANE_Handle handle, SANE_Byte * buf,
+ SANE_Int max_len, SANE_Int * len)
+{
+ struct P5_Session *session = (struct P5_Session *) handle;
+ struct P5_Device *dev = session->dev;
+ SANE_Status status = SANE_STATUS_GOOD;
+ int count;
+ int size, lines;
+ SANE_Bool x2;
+ SANE_Int i;
+
+ DBG (DBG_proc, "sane_read: start\n");
+ DBG (DBG_io, "sane_read: up to %d bytes required by frontend\n", max_len);
+
+ /* some sanity checks first to protect from would be buggy frontends */
+ if (!session)
+ {
+ DBG (DBG_error, "sane_read: handle is null!\n");
+ return SANE_STATUS_INVAL;
+ }
+
+ if (!buf)
+ {
+ DBG (DBG_error, "sane_read: buf is null!\n");
+ return SANE_STATUS_INVAL;
+ }
+
+ if (!len)
+ {
+ DBG (DBG_error, "sane_read: len is null!\n");
+ return SANE_STATUS_INVAL;
+ }
+
+ /* no data read yet */
+ *len = 0;
+
+ /* check if session is scanning */
+ if (!session->scanning)
+ {
+ DBG (DBG_warn,
+ "sane_read: scan was cancelled, is over or has not been initiated yet\n");
+ return SANE_STATUS_CANCELLED;
+ }
+
+ /* check for EOF, must be done before any physical read */
+ if (session->sent >= session->to_send)
+ {
+ DBG (DBG_io, "sane_read: end of scan reached\n");
+ return SANE_STATUS_EOF;
+ }
+
+ /* if working buffer is empty, we do a physical data read */
+ if (dev->top <= dev->bottom)
+ {
+ DBG (DBG_io, "sane_read: physical data read\n");
+ /* check is there is data available. In case of non-blocking mode we return
+ * as soon it is detected there is no data yet. Reads must by done line by
+ * line, so we read only when count is bigger than bytes per line
+ * */
+ count = available_bytes (dev->fd);
+ DBG (DBG_io, "sane_read: count=%d bytes\n", count);
+ if (count < dev->bytes_per_line && session->non_blocking == SANE_TRUE)
+ {
+ DBG (DBG_io, "sane_read: scanner hasn't enough data available\n");
+ DBG (DBG_proc, "sane_read: exit\n");
+ return SANE_STATUS_GOOD;
+ }
+
+ /* now we can wait for data here */
+ while (count < dev->bytes_per_line)
+ {
+ /* test if document left the feeder, so we have to terminate the scan */
+ status = test_document (dev->fd);
+ if (status == SANE_STATUS_NO_DOCS)
+ {
+ session->to_send = session->sent;
+ return SANE_STATUS_EOF;
+ }
+
+ /* don't call scanner too often */
+ usleep (10000);
+ count = available_bytes (dev->fd);
+ }
+
+ /** compute size of physical data to read
+ * on first read, position will be 0, while it will be 'bottom'
+ * for the subsequent reads.
+ * We try to read a complete buffer */
+ size = dev->size - dev->position;
+
+ if (session->to_send - session->sent < size)
+ {
+ /* not enough data left, so read remainder of scan */
+ size = session->to_send - session->sent;
+ }
+
+ /* 600 dpi is 300x600 physical, and 400 is 200x400 */
+ if (dev->ydpi > dev->model->max_xdpi)
+ {
+ x2 = SANE_TRUE;
+ }
+ else
+ {
+ x2 = SANE_FALSE;
+ }
+ lines = read_line (dev,
+ dev->buffer + dev->position,
+ dev->bytes_per_line,
+ size / dev->bytes_per_line,
+ SANE_TRUE, x2, dev->mode, dev->calibrated);
+
+ /* handle document end detection TODO try to recover the partial
+ * buffer already read before EOD */
+ if (lines == -1)
+ {
+ DBG (DBG_io, "sane_read: error reading line\n");
+ return SANE_STATUS_IO_ERROR;
+ }
+
+ /* gather lines until we have more than needed for lds */
+ dev->position += lines * dev->bytes_per_line;
+ dev->top = dev->position;
+ if (dev->position > dev->bottom)
+ {
+ dev->position = dev->bottom;
+ }
+ DBG (DBG_io, "sane_read: size =%lu\n", (unsigned long)dev->size);
+ DBG (DBG_io, "sane_read: bottom =%lu\n", (unsigned long)dev->bottom);
+ DBG (DBG_io, "sane_read: position=%lu\n", (unsigned long)dev->position);
+ DBG (DBG_io, "sane_read: top =%lu\n", (unsigned long)dev->top);
+ } /* end of physical data reading */
+
+ /* logical data reading */
+ /* check if there data available in working buffer */
+ if (dev->position < dev->top && dev->position >= dev->bottom)
+ {
+ DBG (DBG_io, "sane_read: logical data read\n");
+ /* we have more data in internal buffer than asked ,
+ * then send only max data */
+ size = dev->top - dev->position;
+ if (max_len < size)
+ {
+ *len = max_len;
+ }
+ else
+ /* if we don't have enough, send all what we have */
+ {
+ *len = dev->top - dev->position;
+ }
+
+ /* data copy */
+ if (dev->lds == 0)
+ {
+ memcpy (buf, dev->buffer + dev->position, *len);
+ }
+ else
+ {
+ /* compute count of bytes for lds */
+ count = dev->lds * dev->bytes_per_line;
+
+ /* adjust for lds as we copy data to frontend */
+ for (i = 0; i < *len; i++)
+ {
+ switch ((dev->position + i) % 3)
+ {
+ /* red */
+ case 0:
+ buf[i] = dev->buffer[dev->position + i - 2 * count];
+ break;
+ /* green */
+ case 1:
+ buf[i] = dev->buffer[dev->position + i - count];
+ break;
+ /* blue */
+ default:
+ buf[i] = dev->buffer[dev->position + i];
+ break;
+ }
+ }
+ }
+ dev->position += *len;
+
+ /* update byte accounting */
+ session->sent += *len;
+ DBG (DBG_io, "sane_read: sent %d bytes from buffer to frontend\n",
+ *len);
+ return SANE_STATUS_GOOD;
+ }
+
+ /* check if we exhausted working buffer */
+ if (dev->position >= dev->top && dev->position >= dev->bottom)
+ {
+ /* copy extra lines needed for lds in next buffer */
+ if (dev->position > dev->bottom && dev->lds > 0)
+ {
+ memcpy (dev->buffer,
+ dev->buffer + dev->position - dev->bottom, dev->bottom);
+ }
+
+ /* restart buffer */
+ dev->position = dev->bottom;
+ dev->top = 0;
+ }
+
+ DBG (DBG_io, "sane_read: size =%lu\n", (unsigned long)dev->size);
+ DBG (DBG_io, "sane_read: bottom =%lu\n", (unsigned long)dev->bottom);
+ DBG (DBG_io, "sane_read: position=%lu\n", (unsigned long)dev->position);
+ DBG (DBG_io, "sane_read: top =%lu\n", (unsigned long)dev->top);
+
+ DBG (DBG_proc, "sane_read: exit\n");
+ return status;
+}
+
+
+/**
+ * Cancels a scan.
+ *
+ * From the SANE spec:
+ * This function is used to immediately or as quickly as possible
+ * cancel the currently pending operation of the device represented by
+ * handle h. This function can be called at any time (as long as
+ * handle h is a valid handle) but usually affects long-running
+ * operations only (such as image is acquisition). It is safe to call
+ * this function asynchronously (e.g., from within a signal handler).
+ * It is important to note that completion of this operaton does not
+ * imply that the currently pending operation has been cancelled. It
+ * only guarantees that cancellation has been initiated. Cancellation
+ * completes only when the cancelled call returns (typically with a
+ * status value of SANE_STATUS_CANCELLED). Since the SANE API does
+ * not require any other operations to be re-entrant, this implies
+ * that a frontend must not call any other operation until the
+ * cancelled operation has returned.
+ */
+void
+sane_cancel (SANE_Handle handle)
+{
+ P5_Session *session = handle;
+
+ DBG (DBG_proc, "sane_cancel: start\n");
+
+ /* if scanning, abort and park head */
+ if (session->scanning == SANE_TRUE)
+ {
+ /* detects if we are called after the scan is finished,
+ * or if the scan is aborted */
+ if (session->sent < session->to_send)
+ {
+ DBG (DBG_info, "sane_cancel: aborting scan.\n");
+ /* device hasn't finished scan, we are aborting it
+ * and we may have to do something specific for it here */
+ }
+ else
+ {
+ DBG (DBG_info, "sane_cancel: cleaning up after scan.\n");
+ }
+ session->scanning = SANE_FALSE;
+ }
+ eject (session->dev->fd);
+
+ DBG (DBG_proc, "sane_cancel: exit\n");
+}
+
+
+/**
+ * Ends use of the session.
+ *
+ * From the SANE spec:
+ * This function terminates the association between the device handle
+ * passed in argument h and the device it represents. If the device is
+ * presently active, a call to sane_cancel() is performed first. After
+ * this function returns, handle h must not be used anymore.
+ *
+ * Handle resources are free'd before disposing the handle. But devices
+ * resources must not be mdofied, since it could be used or reused until
+ * sane_exit() is called.
+ */
+void
+sane_close (SANE_Handle handle)
+{
+ P5_Session *prev, *session;
+
+ DBG (DBG_proc, "sane_close: start\n");
+
+ /* remove handle from list of open handles: */
+ prev = NULL;
+ for (session = sessions; session; session = session->next)
+ {
+ if (session == handle)
+ break;
+ prev = session;
+ }
+ if (!session)
+ {
+ DBG (DBG_error0, "close: invalid handle %p\n", handle);
+ return; /* oops, not a handle we know about */
+ }
+
+ /* cancel any active scan */
+ if (session->scanning == SANE_TRUE)
+ {
+ sane_cancel (handle);
+ }
+
+ if (prev)
+ prev->next = session->next;
+ else
+ sessions = session->next;
+
+ /* close low level device */
+ if (session->dev->initialized == SANE_TRUE)
+ {
+ if (session->dev->calibrated == SANE_TRUE)
+ {
+ save_calibration (session->dev);
+ }
+ disconnect (session->dev->fd);
+ close_pp (session->dev->fd);
+ session->dev->fd = -1;
+ session->dev->initialized = SANE_FALSE;
+
+ /* free device data */
+ if (session->dev->buffer != NULL)
+ {
+ free (session->dev->buffer);
+ }
+ if (session->dev->buffer != NULL)
+ {
+ free (session->dev->gain);
+ free (session->dev->offset);
+ }
+ if (session->dev->calibrated == SANE_TRUE)
+ {
+ cleanup_calibration (session->dev);
+ }
+ }
+
+ /* free per session data */
+ free (session->options[OPT_MODE].value.s);
+ free ((void *)session->options[OPT_RESOLUTION].descriptor.constraint.word_list);
+
+ free (session);
+
+ DBG (DBG_proc, "sane_close: exit\n");
+}
+
+
+/**
+ * Terminates the backend.
+ *
+ * From the SANE spec:
+ * This function must be called to terminate use of a backend. The
+ * function will first close all device handles that still might be
+ * open (it is recommended to close device handles explicitly through
+ * a call to sane_close(), but backends are required to release all
+ * resources upon a call to this function). After this function
+ * returns, no function other than sane_init() may be called
+ * (regardless of the status value returned by sane_exit(). Neglecting
+ * to call this function may result in some resources not being
+ * released properly.
+ */
+void
+sane_exit (void)
+{
+ struct P5_Session *session, *next;
+ struct P5_Device *dev, *nextdev;
+ int i;
+
+ DBG (DBG_proc, "sane_exit: start\n");
+ init_count--;
+
+ if (init_count > 0)
+ {
+ DBG (DBG_info,
+ "sane_exit: still %d fronteds to leave before effective exit.\n",
+ init_count);
+ return;
+ }
+
+ /* free session structs */
+ for (session = sessions; session; session = next)
+ {
+ next = session->next;
+ sane_close ((SANE_Handle *) session);
+ free (session);
+ }
+ sessions = NULL;
+
+ /* free devices structs */
+ for (dev = devices; dev; dev = nextdev)
+ {
+ nextdev = dev->next;
+ free (dev->name);
+ free (dev);
+ }
+ devices = NULL;
+
+ /* now list of devices */
+ if (devlist)
+ {
+ i = 0;
+ while ((SANE_Device *) devlist[i])
+ {
+ free ((SANE_Device *) devlist[i]);
+ i++;
+ }
+ free (devlist);
+ devlist = NULL;
+ }
+
+ DBG (DBG_proc, "sane_exit: exit\n");
+}
+
+
+/** @brief probe for all supported devices
+ * This functions tries to probe if any of the supported devices of
+ * the backend is present. Each detected device will be added to the
+ * 'devices' list
+ */
+static SANE_Status
+probe_p5_devices (void)
+{
+ /**> configuration structure used during attach */
+ SANEI_Config config;
+ /**> list of configuration options */
+ SANE_Option_Descriptor *cfg_options[NUM_CFG_OPTIONS];
+ /**> placeholders pointers for option values */
+ void *values[NUM_CFG_OPTIONS];
+ int i;
+ SANE_Status status;
+
+ DBG (DBG_proc, "probe_p5_devices: start\n");
+
+ /* initialize configuration options */
+ cfg_options[CFG_MODEL_NAME] =
+ (SANE_Option_Descriptor *) malloc (sizeof (SANE_Option_Descriptor));
+ cfg_options[CFG_MODEL_NAME]->name = "modelname";
+ cfg_options[CFG_MODEL_NAME]->desc = "user provided scanner's model name";
+ cfg_options[CFG_MODEL_NAME]->type = SANE_TYPE_INT;
+ cfg_options[CFG_MODEL_NAME]->unit = SANE_UNIT_NONE;
+ cfg_options[CFG_MODEL_NAME]->size = sizeof (SANE_Word);
+ cfg_options[CFG_MODEL_NAME]->cap = SANE_CAP_SOFT_SELECT;
+ cfg_options[CFG_MODEL_NAME]->constraint_type = SANE_CONSTRAINT_NONE;
+ values[CFG_MODEL_NAME] = &p5cfg.modelname;
+
+ /* set configuration options structure */
+ config.descriptors = cfg_options;
+ config.values = values;
+ config.count = NUM_CFG_OPTIONS;
+
+ /* generic configure and attach function */
+ status = sanei_configure_attach (P5_CONFIG_FILE, &config, config_attach);
+ /* free allocated options */
+ for (i = 0; i < NUM_CFG_OPTIONS; i++)
+ {
+ free (cfg_options[i]);
+ }
+
+ DBG (DBG_proc, "probe_p5_devices: end\n");
+ return status;
+}
+
+/** This function is called by sanei_configure_attach to try
+ * to attach the backend to a device specified by the configuration file.
+ *
+ * @param config configuration structure filled with values read
+ * from configuration file
+ * @param devname name of the device to try to attach to, it is
+ * the unprocessed line of the configuration file
+ *
+ * @return status SANE_STATUS_GOOD if no errors (even if no matching
+ * devices found)
+ * SANE_STATUS_INVAL in case of error
+ */
+static SANE_Status
+config_attach (SANEI_Config * config, const char *devname)
+{
+ /* currently, the config is a global variable so config is useless here */
+ /* the correct thing would be to have a generic sanei_attach_matching_devices
+ * using an attach function with a config parameter */
+ config = config;
+
+ /* the devname has been processed and is ready to be used
+ * directly. The config struct contains all the configuration data for
+ * the corresponding device. Since there is no ressources common to each
+ * backends regarding parallel port, we can directly call the attach
+ * function. */
+ attach_p5 (devname, config);
+
+ return SANE_STATUS_GOOD;
+}
+
+/** @brief try to attach to a device by its name
+ * The attach tries to open the given device and match it
+ * with devices handled by the backend. The configuration parameter
+ * contains the values of the already parsed configuration options
+ * from the conf file.
+ * @param config configuration structure filled with values read
+ * from configuration file
+ * @param devicename name of the device to try to attach to, it is
+ * the unprocessed line of the configuration file
+ *
+ * @return status SANE_STATUS_GOOD if no errors (even if no matching
+ * devices found)
+ * SANE_STATUS_NOM_MEM if there isn't enough memory to allocate the
+ * device structure
+ * SANE_STATUS_UNSUPPORTED if the device if unknown by the backend
+ * SANE_STATUS_INVAL in case of other error
+ */
+static SANE_Status
+attach_p5 (const char *devicename, SANEI_Config * config)
+{
+ struct P5_Device *device;
+ struct P5_Model *model;
+
+ DBG (DBG_proc, "attach(%s): start\n", devicename);
+ if(config==NULL)
+ {
+ DBG (DBG_warn, "attach: config is NULL\n");
+ }
+
+ /* search if we already have it attached */
+ for (device = devices; device; device = device->next)
+ {
+ if (strcmp (device->name, devicename) == 0)
+ {
+ DBG (DBG_info, "attach: device already attached\n");
+ DBG (DBG_proc, "attach: exit\n");
+ return SANE_STATUS_GOOD;
+ }
+ }
+
+ /**
+ * do physical probe of the device here. In case the device is recognized,
+ * we allocate a device struct and give it options and model.
+ * Else we return SANE_STATUS_UNSUPPORTED.
+ */
+ model = probe (devicename);
+ if (model == NULL)
+ {
+ DBG (DBG_info,
+ "attach: device %s is not managed by the backend\n", devicename);
+ DBG (DBG_proc, "attach: exit\n");
+ return SANE_STATUS_UNSUPPORTED;
+ }
+
+ /* allocate device struct */
+ device = malloc (sizeof (*device));
+ if (device == NULL)
+ {
+ return SANE_STATUS_NO_MEM;
+ DBG (DBG_proc, "attach: exit\n");
+ }
+ memset (device, 0, sizeof (*device));
+ device->model = model;
+
+ /* name of the device */
+ device->name = strdup (devicename);
+
+ DBG (DBG_info, "attach: found %s %s %s at %s\n",
+ device->model->vendor, device->model->product, device->model->type,
+ device->name);
+
+ /* we insert new device at start of the chained list */
+ /* head of the list becomes the next, and start is replaced */
+ /* with the new session struct */
+ device->next = devices;
+ devices = device;
+
+ /* intialization is done at sane_open */
+ device->initialized = SANE_FALSE;
+ device->calibrated = SANE_FALSE;
+
+ DBG (DBG_proc, "attach: exit\n");
+ return SANE_STATUS_GOOD;
+}
+
+
+/** @brief set initial value for the scanning options
+ * for each sessions, control options are initalized based on the capability
+ * of the model of the physical device.
+ * @param session scanner session to initialize options
+ * @return SANE_STATUS_GOOD on success
+ */
+static SANE_Status
+init_options (struct P5_Session *session)
+{
+ SANE_Int option, i, min, idx;
+ SANE_Word *dpi_list;
+ P5_Model *model = session->dev->model;
+
+ DBG (DBG_proc, "init_options: start\n");
+
+ /* we first initialize each options with a default value */
+ memset (session->options, 0, sizeof (session->options[OPT_NUM_OPTS]));
+ for (option = 0; option < NUM_OPTIONS; option++)
+ {
+ session->options[option].descriptor.size = sizeof (SANE_Word);
+ session->options[option].descriptor.cap =
+ SANE_CAP_SOFT_SELECT | SANE_CAP_SOFT_DETECT;
+ }
+
+ /* we set up all the options listed in the P5_Option enum */
+
+ /* last option / end of list marker */
+ session->options[OPT_NUM_OPTS].descriptor.name = SANE_NAME_NUM_OPTIONS;
+ session->options[OPT_NUM_OPTS].descriptor.title = SANE_TITLE_NUM_OPTIONS;
+ session->options[OPT_NUM_OPTS].descriptor.desc = SANE_DESC_NUM_OPTIONS;
+ session->options[OPT_NUM_OPTS].descriptor.type = SANE_TYPE_INT;
+ session->options[OPT_NUM_OPTS].descriptor.cap = SANE_CAP_SOFT_DETECT;
+ session->options[OPT_NUM_OPTS].value.w = NUM_OPTIONS;
+
+ /* "Standard" group: */
+ session->options[OPT_STANDARD_GROUP].descriptor.title = SANE_TITLE_STANDARD;
+ session->options[OPT_STANDARD_GROUP].descriptor.name = SANE_NAME_STANDARD;
+ session->options[OPT_STANDARD_GROUP].descriptor.desc = SANE_DESC_STANDARD;
+ session->options[OPT_STANDARD_GROUP].descriptor.type = SANE_TYPE_GROUP;
+ session->options[OPT_STANDARD_GROUP].descriptor.size = 0;
+ session->options[OPT_STANDARD_GROUP].descriptor.cap = 0;
+ session->options[OPT_STANDARD_GROUP].descriptor.constraint_type =
+ SANE_CONSTRAINT_NONE;
+
+ /* scan mode */
+ session->options[OPT_MODE].descriptor.name = SANE_NAME_SCAN_MODE;
+ session->options[OPT_MODE].descriptor.title = SANE_TITLE_SCAN_MODE;
+ session->options[OPT_MODE].descriptor.desc = SANE_DESC_SCAN_MODE;
+ session->options[OPT_MODE].descriptor.type = SANE_TYPE_STRING;
+ session->options[OPT_MODE].descriptor.cap |= SANE_CAP_AUTOMATIC;
+ session->options[OPT_MODE].descriptor.constraint_type =
+ SANE_CONSTRAINT_STRING_LIST;
+ session->options[OPT_MODE].descriptor.size = max_string_size (mode_list);
+ session->options[OPT_MODE].descriptor.constraint.string_list = mode_list;
+ session->options[OPT_MODE].value.s = strdup (mode_list[0]);
+
+ /* preview */
+ session->options[OPT_PREVIEW].descriptor.name = SANE_NAME_PREVIEW;
+ session->options[OPT_PREVIEW].descriptor.title = SANE_TITLE_PREVIEW;
+ session->options[OPT_PREVIEW].descriptor.desc = SANE_DESC_PREVIEW;
+ session->options[OPT_PREVIEW].descriptor.type = SANE_TYPE_BOOL;
+ session->options[OPT_PREVIEW].descriptor.cap |= SANE_CAP_AUTOMATIC;
+ session->options[OPT_PREVIEW].descriptor.unit = SANE_UNIT_NONE;
+ session->options[OPT_PREVIEW].descriptor.constraint_type =
+ SANE_CONSTRAINT_NONE;
+ session->options[OPT_PREVIEW].value.w = SANE_FALSE;
+
+ /** @brief build resolution list
+ * We merge xdpi and ydpi list to provide only one resolution option control.
+ * This is the most common case for backends and fronteds and give 'square'
+ * pixels. The SANE API allow to control x and y dpi independantly, but this is
+ * rarely done and may confuse both frontends and users. In case a dpi value exists
+ * for one but not for the other, the backend will have to crop data so that the
+ * frontend is unaffected. A common case is that motor resolution (ydpi) is higher
+ * than sensor resolution (xdpi), so scan lines must be scaled up to keep square
+ * pixel when doing sane_read().
+ * TODO this deserves a dedicated function and some unit testing
+ */
+
+ /* find minimum first */
+ min = 65535;
+ for (i = 0; i < MAX_RESOLUTIONS && model->xdpi_values[i] > 0; i++)
+ {
+ if (model->xdpi_values[i] < min)
+ min = model->xdpi_values[i];
+ }
+ for (i = 0; i < MAX_RESOLUTIONS && model->ydpi_values[i] > 0; i++)
+ {
+ if (model->ydpi_values[i] < min)
+ min = model->ydpi_values[i];
+ }
+
+ dpi_list = malloc ((MAX_RESOLUTIONS * 2 + 1) * sizeof (SANE_Word));
+ if (!dpi_list)
+ return SANE_STATUS_NO_MEM;
+ dpi_list[1] = min;
+ idx = 2;
+
+ /* find any value greater than the last used min and
+ * less than the max value
+ */
+ do
+ {
+ min = 65535;
+ for (i = 0; i < MAX_RESOLUTIONS && model->xdpi_values[i] > 0; i++)
+ {
+ if (model->xdpi_values[i] < min
+ && model->xdpi_values[i] > dpi_list[idx - 1])
+ min = model->xdpi_values[i];
+ }
+ for (i = 0; i < MAX_RESOLUTIONS && model->ydpi_values[i] > 0; i++)
+ {
+ if (model->ydpi_values[i] < min
+ && model->ydpi_values[i] > dpi_list[idx - 1])
+ min = model->ydpi_values[i];
+ }
+ if (min < 65535)
+ {
+ dpi_list[idx] = min;
+ idx++;
+ }
+ }
+ while (min != 65535);
+ dpi_list[idx] = 0;
+ /* the count of different resolution is put at the beginning */
+ dpi_list[0] = idx - 1;
+
+ session->options[OPT_RESOLUTION].descriptor.name =
+ SANE_NAME_SCAN_RESOLUTION;
+ session->options[OPT_RESOLUTION].descriptor.title =
+ SANE_TITLE_SCAN_RESOLUTION;
+ session->options[OPT_RESOLUTION].descriptor.desc =
+ SANE_DESC_SCAN_RESOLUTION;
+ session->options[OPT_RESOLUTION].descriptor.type = SANE_TYPE_INT;
+ session->options[OPT_RESOLUTION].descriptor.cap |= SANE_CAP_AUTOMATIC;
+ session->options[OPT_RESOLUTION].descriptor.unit = SANE_UNIT_DPI;
+ session->options[OPT_RESOLUTION].descriptor.constraint_type =
+ SANE_CONSTRAINT_WORD_LIST;
+ session->options[OPT_RESOLUTION].descriptor.constraint.word_list = dpi_list;
+
+ /* initial value is lowest available dpi */
+ session->options[OPT_RESOLUTION].value.w = min;
+
+ /* "Geometry" group: */
+ session->options[OPT_GEOMETRY_GROUP].descriptor.title = SANE_TITLE_GEOMETRY;
+ session->options[OPT_GEOMETRY_GROUP].descriptor.name = SANE_NAME_GEOMETRY;
+ session->options[OPT_GEOMETRY_GROUP].descriptor.desc = SANE_DESC_GEOMETRY;
+ session->options[OPT_GEOMETRY_GROUP].descriptor.type = SANE_TYPE_GROUP;
+ session->options[OPT_GEOMETRY_GROUP].descriptor.cap = SANE_CAP_ADVANCED;
+ session->options[OPT_GEOMETRY_GROUP].descriptor.size = 0;
+ session->options[OPT_GEOMETRY_GROUP].descriptor.constraint_type =
+ SANE_CONSTRAINT_NONE;
+
+ /* adapt the constraint range to the detected model */
+ x_range.max = model->x_size;
+ y_range.max = model->y_size;
+
+ /* top-left x */
+ session->options[OPT_TL_X].descriptor.name = SANE_NAME_SCAN_TL_X;
+ session->options[OPT_TL_X].descriptor.title = SANE_TITLE_SCAN_TL_X;
+ session->options[OPT_TL_X].descriptor.desc = SANE_DESC_SCAN_TL_X;
+ session->options[OPT_TL_X].descriptor.type = SANE_TYPE_FIXED;
+ session->options[OPT_TL_X].descriptor.cap |= SANE_CAP_AUTOMATIC;
+ session->options[OPT_TL_X].descriptor.unit = SANE_UNIT_MM;
+ session->options[OPT_TL_X].descriptor.constraint_type =
+ SANE_CONSTRAINT_RANGE;
+ session->options[OPT_TL_X].descriptor.constraint.range = &x_range;
+ session->options[OPT_TL_X].value.w = 0;
+
+ /* top-left y */
+ session->options[OPT_TL_Y].descriptor.name = SANE_NAME_SCAN_TL_Y;
+ session->options[OPT_TL_Y].descriptor.title = SANE_TITLE_SCAN_TL_Y;
+ session->options[OPT_TL_Y].descriptor.desc = SANE_DESC_SCAN_TL_Y;
+ session->options[OPT_TL_Y].descriptor.type = SANE_TYPE_FIXED;
+ session->options[OPT_TL_Y].descriptor.cap |= SANE_CAP_AUTOMATIC;
+ session->options[OPT_TL_Y].descriptor.unit = SANE_UNIT_MM;
+ session->options[OPT_TL_Y].descriptor.constraint_type =
+ SANE_CONSTRAINT_RANGE;
+ session->options[OPT_TL_Y].descriptor.constraint.range = &y_range;
+ session->options[OPT_TL_Y].value.w = 0;
+
+ /* bottom-right x */
+ session->options[OPT_BR_X].descriptor.name = SANE_NAME_SCAN_BR_X;
+ session->options[OPT_BR_X].descriptor.title = SANE_TITLE_SCAN_BR_X;
+ session->options[OPT_BR_X].descriptor.desc = SANE_DESC_SCAN_BR_X;
+ session->options[OPT_BR_X].descriptor.type = SANE_TYPE_FIXED;
+ session->options[OPT_BR_X].descriptor.cap |= SANE_CAP_AUTOMATIC;
+ session->options[OPT_BR_X].descriptor.unit = SANE_UNIT_MM;
+ session->options[OPT_BR_X].descriptor.constraint_type =
+ SANE_CONSTRAINT_RANGE;
+ session->options[OPT_BR_X].descriptor.constraint.range = &x_range;
+ session->options[OPT_BR_X].value.w = x_range.max;
+
+ /* bottom-right y */
+ session->options[OPT_BR_Y].descriptor.name = SANE_NAME_SCAN_BR_Y;
+ session->options[OPT_BR_Y].descriptor.title = SANE_TITLE_SCAN_BR_Y;
+ session->options[OPT_BR_Y].descriptor.desc = SANE_DESC_SCAN_BR_Y;
+ session->options[OPT_BR_Y].descriptor.type = SANE_TYPE_FIXED;
+ session->options[OPT_BR_Y].descriptor.cap |= SANE_CAP_AUTOMATIC;
+ session->options[OPT_BR_Y].descriptor.unit = SANE_UNIT_MM;
+ session->options[OPT_BR_Y].descriptor.constraint_type =
+ SANE_CONSTRAINT_RANGE;
+ session->options[OPT_BR_Y].descriptor.constraint.range = &y_range;
+ session->options[OPT_BR_Y].value.w = y_range.max;
+
+ /* sensor group */
+ session->options[OPT_SENSOR_GROUP].descriptor.name = SANE_NAME_SENSORS;
+ session->options[OPT_SENSOR_GROUP].descriptor.title = SANE_TITLE_SENSORS;
+ session->options[OPT_SENSOR_GROUP].descriptor.desc = SANE_DESC_SENSORS;
+ session->options[OPT_SENSOR_GROUP].descriptor.type = SANE_TYPE_GROUP;
+ session->options[OPT_SENSOR_GROUP].descriptor.constraint_type =
+ SANE_CONSTRAINT_NONE;
+
+ /* page loaded sensor */
+ session->options[OPT_PAGE_LOADED_SW].descriptor.name =
+ SANE_NAME_PAGE_LOADED;
+ session->options[OPT_PAGE_LOADED_SW].descriptor.title =
+ SANE_TITLE_PAGE_LOADED;
+ session->options[OPT_PAGE_LOADED_SW].descriptor.desc =
+ SANE_DESC_PAGE_LOADED;
+ session->options[OPT_PAGE_LOADED_SW].descriptor.type = SANE_TYPE_BOOL;
+ session->options[OPT_PAGE_LOADED_SW].descriptor.unit = SANE_UNIT_NONE;
+ session->options[OPT_PAGE_LOADED_SW].descriptor.cap =
+ SANE_CAP_SOFT_DETECT | SANE_CAP_HARD_SELECT | SANE_CAP_ADVANCED;
+ session->options[OPT_PAGE_LOADED_SW].value.b = 0;
+
+ /* calibration needed */
+ session->options[OPT_NEED_CALIBRATION_SW].descriptor.name =
+ "need-calibration";
+ session->options[OPT_NEED_CALIBRATION_SW].descriptor.title =
+ SANE_I18N ("Need calibration");
+ session->options[OPT_NEED_CALIBRATION_SW].descriptor.desc =
+ SANE_I18N ("The scanner needs calibration for the current settings");
+ session->options[OPT_NEED_CALIBRATION_SW].descriptor.type = SANE_TYPE_BOOL;
+ session->options[OPT_NEED_CALIBRATION_SW].descriptor.unit = SANE_UNIT_NONE;
+ session->options[OPT_NEED_CALIBRATION_SW].descriptor.cap =
+ SANE_CAP_SOFT_DETECT | SANE_CAP_HARD_SELECT | SANE_CAP_ADVANCED;
+ session->options[OPT_NEED_CALIBRATION_SW].value.b = 0;
+
+ /* button group */
+ session->options[OPT_BUTTON_GROUP].descriptor.name = "Buttons";
+ session->options[OPT_BUTTON_GROUP].descriptor.title = SANE_I18N ("Buttons");
+ session->options[OPT_BUTTON_GROUP].descriptor.desc = SANE_I18N ("Buttons");
+ session->options[OPT_BUTTON_GROUP].descriptor.type = SANE_TYPE_GROUP;
+ session->options[OPT_BUTTON_GROUP].descriptor.constraint_type =
+ SANE_CONSTRAINT_NONE;
+
+ /* calibrate button */
+ session->options[OPT_CALIBRATE].descriptor.name = "calibrate";
+ session->options[OPT_CALIBRATE].descriptor.title = SANE_I18N ("Calibrate");
+ session->options[OPT_CALIBRATE].descriptor.desc =
+ SANE_I18N ("Start calibration using special sheet");
+ session->options[OPT_CALIBRATE].descriptor.type = SANE_TYPE_BUTTON;
+ session->options[OPT_CALIBRATE].descriptor.unit = SANE_UNIT_NONE;
+ session->options[OPT_CALIBRATE].descriptor.cap =
+ SANE_CAP_SOFT_DETECT | SANE_CAP_SOFT_SELECT | SANE_CAP_ADVANCED |
+ SANE_CAP_AUTOMATIC;
+ session->options[OPT_CALIBRATE].value.b = 0;
+
+ /* clear calibration cache button */
+ session->options[OPT_CLEAR_CALIBRATION].descriptor.name = "clear";
+ session->options[OPT_CLEAR_CALIBRATION].descriptor.title =
+ SANE_I18N ("Clear calibration");
+ session->options[OPT_CLEAR_CALIBRATION].descriptor.desc =
+ SANE_I18N ("Clear calibration cache");
+ session->options[OPT_CLEAR_CALIBRATION].descriptor.type = SANE_TYPE_BUTTON;
+ session->options[OPT_CLEAR_CALIBRATION].descriptor.unit = SANE_UNIT_NONE;
+ session->options[OPT_CLEAR_CALIBRATION].descriptor.cap =
+ SANE_CAP_SOFT_DETECT | SANE_CAP_SOFT_SELECT | SANE_CAP_ADVANCED |
+ SANE_CAP_AUTOMATIC;
+ session->options[OPT_CLEAR_CALIBRATION].value.b = 0;
+
+ /* until work on calibration isfinished */
+ DISABLE (OPT_CALIBRATE);
+ DISABLE (OPT_CLEAR_CALIBRATION);
+
+ DBG (DBG_proc, "init_options: exit\n");
+ return SANE_STATUS_GOOD;
+}
+
+/** @brief physical probe of a device
+ * This function probes for a scanning device using the given name. If the
+ * device is managed, a model structure describing the device will be returned.
+ * @param devicename low level device to access to probe hardware
+ * @return NULL is the device is unsupported, or a model struct describing the
+ * device.
+ */
+P5_Model *
+probe (const char *devicename)
+{
+ int fd;
+
+ /* open parallel port device */
+ fd = open_pp (devicename);
+ if (fd < 0)
+ {
+ DBG (DBG_error, "probe: failed to open '%s' device!\n", devicename);
+ return NULL;
+ }
+
+ /* now try to connect to scanner */
+ if (connect (fd) != SANE_TRUE)
+ {
+ DBG (DBG_error, "probe: failed to connect!\n");
+ close_pp (fd);
+ return NULL;
+ }
+
+ /* set up for memory test */
+ write_reg (fd, REG1, 0x00);
+ write_reg (fd, REG7, 0x00);
+ write_reg (fd, REG0, 0x00);
+ write_reg (fd, REG1, 0x00);
+ write_reg (fd, REGF, 0x80);
+ if (memtest (fd, 0x0100) != SANE_TRUE)
+ {
+ disconnect (fd);
+ close_pp (fd);
+ DBG (DBG_error, "probe: memory test failed!\n");
+ return NULL;
+ }
+ else
+ {
+ DBG (DBG_info, "memtest() OK...\n");
+ }
+ write_reg (fd, REG7, 0x00);
+
+ /* check for document presence 0xC6: present, 0xC3 no document */
+ test_document (fd);
+
+ /* release device nd parport for next uses */
+ disconnect (fd);
+ close_pp (fd);
+
+ /* for there is only one supported model, so we use hardcoded values */
+ DBG (DBG_proc, "probe: exit\n");
+ return &pagepartner_model;
+}
+
+
+/* vim: set sw=2 cino=>2se-1sn-1s{s^-1st0(0u0 smarttab expandtab: */