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Diffstat (limited to 'backend/channel-scsi.c')
| -rw-r--r-- | backend/channel-scsi.c | 170 |
1 files changed, 170 insertions, 0 deletions
diff --git a/backend/channel-scsi.c b/backend/channel-scsi.c new file mode 100644 index 0000000..20c9e93 --- /dev/null +++ b/backend/channel-scsi.c @@ -0,0 +1,170 @@ +/* channel_scsi.c -- SCSI 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 SCSI 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 "epkowa_scsi.h" + + +static void channel_scsi_open (channel *, SANE_Status *); +static void channel_scsi_close (channel *, SANE_Status *); + +static ssize_t channel_scsi_send (channel *, const void *, + size_t, SANE_Status *); +static ssize_t channel_scsi_recv (channel *, void *, + size_t, SANE_Status *); + +static void channel_scsi_set_max_request_size (channel *, size_t); + + +channel * +channel_scsi_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, "scsi:", strlen ("scsi:"))); + + dev_name += strlen ("scsi:"); + name_len = 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); + } + strcpy (self->name, dev_name); + + self->open = channel_scsi_open; + self->close = channel_scsi_close; + + self->send = channel_scsi_send; + self->recv = channel_scsi_recv; + + self->set_max_request_size = channel_scsi_set_max_request_size; + + self->max_size = sanei_scsi_max_request_size; + + return self; +} + +static ssize_t +channel_scsi_send (channel *self, const void *buffer, + size_t size, SANE_Status *status) +{ + return sanei_epson_scsi_write (self->fd, buffer, size, status); +} + +static ssize_t +channel_scsi_recv (channel *self, void *buffer, + size_t size, SANE_Status *status) +{ + return sanei_epson_scsi_read (self->fd, buffer, size, status); +} + +static void +channel_scsi_open (channel *self, SANE_Status *status) +{ + SANE_Status s = sanei_scsi_open (self->name, &self->fd, + sanei_epson_scsi_sense_handler, NULL); + if (SANE_STATUS_GOOD != s) + { + err_fatal ("can not open %s (%s)", self->name, sane_strstatus (s)); + } + if (status) *status = s; +} + +static void +channel_scsi_close (channel *self, SANE_Status *status) +{ + sanei_scsi_close (self->fd); + self->fd = -1; + + if (status) *status = SANE_STATUS_GOOD; +} + +static void +channel_scsi_set_max_request_size (channel *self, size_t size) +{ + require (self); + + self->max_size = (size < sanei_scsi_max_request_size) + ? size : sanei_scsi_max_request_size; +} |