82 lines
2.2 KiB
C
82 lines
2.2 KiB
C
/* ****************************************************************************
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* link/open/usb.c -- open a USB communication.
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* Copyright (C) 2016-2017 Thomas "Cakeisalie5" Touhey <thomas@touhey.fr>
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*
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* This file is part of libcasio.
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* libcasio is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 3.0 of the License,
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* or (at your option) any later version.
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*
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* libcasio is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with libcasio; if not, see <http://www.gnu.org/licenses/>.
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* ************************************************************************* */
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#include "../link.h"
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/**
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* casio_open_usb:
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* Open a USB communication.
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*
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* @arg handle the link handle to make.
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* @arg flags the link flags.
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* @arg bus the bus number.
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* @arg address the device number.
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* @return the error code (0 if ok).
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*/
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int CASIO_EXPORT casio_open_usb(casio_link_t **handle, unsigned long flags,
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int bus, int address)
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{
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int err, failed = 0, tries = 3;
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casio_stream_t *stream, *ns;
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/* Open the base USB stream. */
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*handle = NULL;
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msg((ll_info, "Looking for USB-connected calculators."));
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while (1) {
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if (failed) {
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msg((ll_info, "Trying again in one second."));
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casio_sleep(1000);
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}
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err = casio_open_usb_stream(&stream, bus, address);
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if (err == casio_error_op)
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return (casio_error_nocalc);
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if (!err)
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break;
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if (err != casio_error_nocalc)
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return (err);
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msg((ll_error, "No device found!"));
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if (!tries--)
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return (casio_error_nocalc);
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failed = 1;
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}
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/* Open the SCSI device stream if required. */
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switch ((err = casio_open_seven_scsi(&ns, stream))) {
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case 0:
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msg((ll_info, "Using stream over SCSI commands."));
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stream = ns;
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break;
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case casio_error_op:
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/* Use the good ol' basic stream. */
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break;
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default:
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return (err);
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}
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/* Open the link based on the stream. */
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return (casio_open_link(handle, flags, stream));
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}
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