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/* channel_pio.c -- parallel 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 parallel device communication channel.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "channel.h"
#include <string.h>
#include "utils.h"
/* Deprecated includes */
#include "sane/sanei_pio.h"
static void channel_pio_open (channel *, SANE_Status *);
static void channel_pio_close (channel *, SANE_Status *);
static ssize_t channel_pio_send (channel *, const void *,
size_t, SANE_Status *);
static ssize_t channel_pio_recv (channel *, void *,
size_t, SANE_Status *);
static void channel_pio_set_max_request_size (channel *, size_t);
channel *
channel_pio_ctor (channel *self, const char *dev_name, SANE_Status *status)
{
require (self && dev_name);
require (0 == strncmp_c (dev_name, "pio:", strlen ("pio:")));
self->open = channel_pio_open;
self->close = channel_pio_close;
self->send = channel_pio_send;
self->recv = channel_pio_recv;
self->set_max_request_size = channel_pio_set_max_request_size;
if (status) *status = SANE_STATUS_UNSUPPORTED;
return self->dtor (self);
}
static ssize_t
channel_pio_send (channel *self, const void *buffer,
size_t size, SANE_Status *status)
{
SANE_Status s = SANE_STATUS_GOOD;
ssize_t n = sanei_pio_write (self->fd, buffer, size);
if (size != n)
s = SANE_STATUS_INVAL;
if (status) *status = s;
return n;
}
static ssize_t
channel_pio_recv (channel *self, void *buffer,
size_t size, SANE_Status *status)
{
SANE_Status s = SANE_STATUS_GOOD;
ssize_t n = sanei_pio_read (self->fd, buffer, (size_t) size);
if (size != n)
s = SANE_STATUS_INVAL;
if (status) *status = s;
return n;
}
static void
channel_pio_open (channel *self, SANE_Status *status)
{
SANE_Status s = sanei_pio_open (self->name, &self->fd);
if (SANE_STATUS_GOOD != s)
{
err_fatal ("can not open %s (%s)", self->name, sane_strstatus (s));
}
if (status) *status = s;
}
static void
channel_pio_close (channel *self, SANE_Status *status)
{
sanei_pio_close (self->fd);
self->fd = -1;
}
static void
channel_pio_set_max_request_size (channel *self, size_t size)
{
require (self);
self->max_size = (size < (32 * 1024)) ? size : (32 * 1024);
}
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