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+/* channel_usb.c -- USB device communication channel
+ * Copyright (C) 2008, 2009, 2013 SEIKO EPSON CORPORATION
+ *
+ * License: GPLv2+|iscan
+ * Authors: AVASYS CORPORATION
+ *
+ * This file is part of the SANE backend distributed with Image Scan!
+ *
+ * Image Scan!'s SANE backend 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 ought to have received a copy of the GNU General Public License
+ * along with this package. If not, see <http://www.gnu.org/licenses/>.
+ *
+ *
+ * Linking Image Scan!'s SANE backend statically or dynamically with
+ * other modules is making a combined work based on this SANE backend.
+ * Thus, the terms and conditions of the GNU General Public License
+ * cover the whole combination.
+ *
+ * As a special exception, the copyright holders of Image Scan!'s SANE
+ * backend give you permission to link Image Scan!'s SANE backend with
+ * SANE frontends that communicate with Image Scan!'s SANE backend
+ * solely through the SANE Application Programming Interface,
+ * regardless of the license terms of these SANE frontends, and to
+ * copy and distribute the resulting combined work under terms of your
+ * choice, provided that every copy of the combined work is
+ * accompanied by a complete copy of the source code of Image Scan!'s
+ * SANE backend (the version of Image Scan!'s SANE backend used to
+ * produce the combined work), being distributed under the terms of
+ * the GNU General Public License plus this exception. An independent
+ * module is a module which is not derived from or based on Image
+ * Scan!'s SANE backend.
+ *
+ * As a special exception, the copyright holders of Image Scan!'s SANE
+ * backend give you permission to link Image Scan!'s SANE backend with
+ * independent modules that communicate with Image Scan!'s SANE
+ * backend solely through the "Interpreter" interface, regardless of
+ * the license terms of these independent modules, and to copy and
+ * distribute the resulting combined work under terms of your choice,
+ * provided that every copy of the combined work is accompanied by a
+ * complete copy of the source code of Image Scan!'s SANE backend (the
+ * version of Image Scan!'s SANE backend used to produce the combined
+ * work), being distributed under the terms of the GNU General Public
+ * License plus this exception. An independent module is a module
+ * which is not derived from or based on Image Scan!'s SANE backend.
+ *
+ * Note that people who make modified versions of Image Scan!'s SANE
+ * backend are not obligated to grant special exceptions for their
+ * modified versions; it is their choice whether to do so. The GNU
+ * General Public License gives permission to release a modified
+ * version without this exception; this exception also makes it
+ * possible to release a modified version which carries forward this
+ * exception.
+ */
+
+
+/*! \file
+ \brief Implements a USB communication channel.
+ */
+
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#define USE_PROTECTED_CHANNEL_API
+#include "channel.h"
+
+#include <string.h>
+
+#include "utils.h"
+
+/* Deprecated includes */
+#include "include/sane/sanei_usb.h"
+#include "epkowa_ip.h"
+
+
+static void channel_usb_open (channel *, SANE_Status *);
+static void channel_usb_close (channel *, SANE_Status *);
+
+static ssize_t channel_usb_send (channel *, const void *,
+ size_t, SANE_Status *);
+static ssize_t channel_usb_recv (channel *, void *,
+ size_t, SANE_Status *);
+
+
+channel *
+channel_usb_ctor (channel *self, const char *dev_name, SANE_Status *status)
+{
+ size_t name_len = 0;
+
+ require (self && dev_name);
+ require (0 == strncmp_c (dev_name, "usb:", strlen ("usb:")));
+
+ dev_name += strlen ("usb:");
+ name_len = strlen ("libusb:") + strlen (dev_name) + 1;
+
+ self->name = t_malloc (name_len, char);
+ if (!self->name)
+ {
+ if (status) *status = SANE_STATUS_NO_MEM;
+ return self->dtor (self);
+ }
+ self->name[0] = '\0';
+ strcat (self->name, "libusb:");
+ strcat (self->name, dev_name);
+
+ self->open = channel_usb_open;
+ self->close = channel_usb_close;
+
+ self->send = channel_usb_send;
+ self->recv = channel_usb_recv;
+
+ self->max_size = 128 * 1024;
+
+ return self;
+}
+
+static ssize_t
+channel_usb_send (channel *self, const void *buffer,
+ size_t size, SANE_Status *status)
+{
+ ssize_t n = size;
+
+ if (self->interpreter)
+ {
+ n = self->interpreter->send (self, buffer, size, status);
+ }
+ else
+ {
+ SANE_Status s;
+ s = sanei_usb_write_bulk (self->fd, buffer, (size_t *)&n);
+ if (status) *status = s;
+ }
+
+ return n;
+}
+
+static ssize_t
+channel_usb_recv (channel *self, void *buffer,
+ size_t size, SANE_Status *status)
+{
+ ssize_t n = size;
+
+ if (self->interpreter)
+ {
+ n = self->interpreter->recv (self, buffer, size, status);
+ }
+ else
+ {
+ SANE_Status s = SANE_STATUS_GOOD;
+ s = sanei_usb_read_bulk (self->fd, (SANE_Byte *) buffer, (size_t *)&n);
+ if (status) *status = s;
+ }
+
+ return n;
+}
+
+static void
+channel_usb_open (channel *self, SANE_Status *status)
+{
+ SANE_Status s;
+
+ s = sanei_usb_open (self->name, &self->fd);
+
+ if (SANE_STATUS_GOOD == s)
+ {
+ SANE_Word product_id = -1;
+
+ sanei_usb_get_vendor_product (self->fd, NULL, &product_id);
+
+ if (-1 != product_id)
+ {
+ self->id = product_id;
+ }
+ }
+
+ if (self->interpreter && SANE_STATUS_GOOD == s)
+ {
+ if (0 > self->interpreter->open (self))
+ {
+ s = SANE_STATUS_IO_ERROR;
+ }
+ }
+
+ if (status) *status = s;
+}
+
+static void
+channel_usb_close (channel *self, SANE_Status *status)
+{
+ SANE_Status s = SANE_STATUS_GOOD;
+
+ if (self->interpreter)
+ {
+ self->interpreter->close (self);
+ }
+
+ sanei_usb_close (self->fd);
+ self->fd = -1;
+ if (status) *status = s;
+}
+
+
+static channel * channel_interpreter_dtor (channel *self);
+
+channel *
+channel_interpreter_ctor (channel *self, const char *dev_name,
+ SANE_Status *status)
+{
+ char *name = NULL;
+ size_t name_len = 0;
+
+ require (self && dev_name);
+ require (0 == strncmp_c (dev_name, "interpreter:", strlen ("interpreter:")));
+
+ dev_name += strlen ("interpreter:");
+ name_len = strlen ("usb:") + strlen (dev_name) + 1;
+
+ name = t_malloc (name_len, char);
+ if (!name)
+ {
+ if (status) *status = SANE_STATUS_NO_MEM;
+ return self->dtor (self);
+ }
+ strcpy (name, "usb:");
+ strcat (name, dev_name);
+
+ self = channel_usb_ctor (self, name, status);
+ delete (name);
+
+ if (self)
+ {
+ SANE_Status s = SANE_STATUS_GOOD;
+ SANE_Word vendor;
+ SANE_Word product;
+
+ self->open (self, &s);
+ if (SANE_STATUS_GOOD == s)
+ {
+ s = sanei_usb_get_vendor_product (self->fd,
+ &vendor, &product);
+ }
+ self->close (self, NULL);
+ if (SANE_STATUS_GOOD == s)
+ {
+ s = create_interpreter (self, product);
+ }
+
+ if (!self->interpreter)
+ {
+ if (status) *status = s;
+ return self->dtor (self);
+ }
+ else
+ {
+ self->dtor = channel_interpreter_dtor;
+ }
+ }
+
+ self->max_size = 32 * 1024;
+
+ return self;
+}
+
+static channel *
+channel_interpreter_dtor (channel *self)
+{
+ require (self);
+
+ if (self->interpreter)
+ {
+ self->interpreter->dtor (self);
+ }
+ self->dtor = channel_dtor;
+ return self->dtor (self);
+}
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