usb_common.c

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/***************************************************************************
 *   Copyright (C) 2009 by Zachary T Welch <zw@superlucidity.net>          *
 *                                                                         *
 *   This program 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 should have received a copy of the GNU General Public License     *
 *   along with this program.  If not, see <http://www.gnu.org/licenses/>. *
 ***************************************************************************/

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "usb_common.h"
#include "log.h"


static bool jtag_usb_match(struct usb_device *dev,
        const uint16_t vids[], const uint16_t pids[])
{
    for (unsigned i = 0; vids[i] && pids[i]; i++) {
        if (dev->descriptor.idVendor == vids[i] &&
            dev->descriptor.idProduct == pids[i])
            return true;
    }
    return false;
}

int jtag_usb_open(const uint16_t vids[], const uint16_t pids[],
        struct usb_dev_handle **out)
{
    usb_find_busses();
    usb_find_devices();

    struct usb_bus *busses = usb_get_busses();
    for (struct usb_bus *bus = busses; bus; bus = bus->next) {
        for (struct usb_device *dev = bus->devices; dev; dev = dev->next) {
            if (!jtag_usb_match(dev, vids, pids))
                continue;

            *out = usb_open(dev);
            if (NULL == *out) {
                LOG_ERROR("usb_open() failed with %s", usb_strerror());
                return ERROR_FAIL;
            }
            return ERROR_OK;
        }
    }
    return ERROR_FAIL;
}