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Diffstat (limited to 'backend/channel-usb.c')
-rw-r--r-- | backend/channel-usb.c | 285 |
1 files changed, 285 insertions, 0 deletions
diff --git a/backend/channel-usb.c b/backend/channel-usb.c new file mode 100644 index 0000000..f83dcb1 --- /dev/null +++ b/backend/channel-usb.c @@ -0,0 +1,285 @@ +/* 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); +} |