src/jtag/drivers/usb_common.c

   1 /***************************************************************************
   2  *   Copyright (C) 2009 by Zachary T Welch <zw@superlucidity.net>          *
   3  *                                                                         *
   4  *   This program is free software; you can redistribute it and/or modify  *
   5  *   it under the terms of the GNU General Public License as published by  *
   6  *   the Free Software Foundation; either version 2 of the License, or     *
   7  *   (at your option) any later version.                                   *
   8  *                                                                         *
   9  *   This program is distributed in the hope that it will be useful,       *
  10  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  11  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  12  *   GNU General Public License for more details.                          *
  13  *                                                                         *
  14  *   You should have received a copy of the GNU General Public License     *
  15  *   along with this program; if not, write to the                         *
  16  *   Free Software Foundation, Inc.,                                       *
  17  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  18  ***************************************************************************/
  19
  20 #ifdef HAVE_CONFIG_H
  21 #include "config.h"
  22 #endif
  23 #include "usb_common.h"
  24
  25
  26 static bool jtag_usb_match(struct usb_device *dev,
  27                 const uint16_t vids[], const uint16_t pids[])
  28 {
  29         for (unsigned i = 0; vids[i] && pids[i]; i++)
  30         {
  31                 if (dev->descriptor.idVendor == vids[i] &&
  32                         dev->descriptor.idProduct == pids[i])
  33                 {
  34                         return true;
  35                 }
  36         }
  37         return false;
  38 }
  39
  40 int jtag_usb_open(const uint16_t vids[], const uint16_t pids[],
  41                 struct usb_dev_handle **out)
  42 {
  43         usb_find_busses();
  44         usb_find_devices();
  45
  46         struct usb_bus *busses = usb_get_busses();
  47         for (struct usb_bus *bus = busses; bus; bus = bus->next)
  48         {
  49                 for (struct usb_device *dev = bus->devices; dev; dev = dev->next)
  50                 {
  51                         if (!jtag_usb_match(dev, vids, pids))
  52                                 continue;
  53
  54                         *out = usb_open(dev);
  55                         if (NULL == *out)
  56                                 return -errno;
  57                         return 0;
  58                 }
  59         }
  60         return -ENODEV;
  61 }