src/jtag/drivers/libusb1_common.c

   1 /***************************************************************************
   2  *   Copyright (C) 2009 by Zachary T Welch <zw@superlucidity.net>          *
   3  *                                                                         *
   4  *   Copyright (C) 2011 by Mauro Gamba <maurillo71@gmail.com>              *
   5  *                                                                         *
   6  *   This program is free software; you can redistribute it and/or modify  *
   7  *   it under the terms of the GNU General Public License as published by  *
   8  *   the Free Software Foundation; either version 2 of the License, or     *
   9  *   (at your option) any later version.                                   *
  10  *                                                                         *
  11  *   This program is distributed in the hope that it will be useful,       *
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  14  *   GNU General Public License for more details.                          *
  15  *                                                                         *
  16  *   You should have received a copy of the GNU General Public License     *
  17  *   along with this program; if not, write to the                         *
  18  *   Free Software Foundation, Inc.,                                       *
  19  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  20  ***************************************************************************/
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include "config.h"
  24 #endif
  25 #include "log.h"
  26 #include "libusb1_common.h"
  27
  28 static struct libusb_context *jtag_libusb_context; /**< Libusb context **/
  29 static libusb_device **devs; /**< The usb device list **/
  30
  31 static bool jtag_libusb_match(struct jtag_libusb_device *dev,
  32                 const uint16_t vids[], const uint16_t pids[])
  33 {
  34         struct libusb_device_descriptor dev_desc;
  35
  36         for (unsigned i = 0; vids[i] && pids[i]; i++) {
  37                 if (libusb_get_device_descriptor(dev, &dev_desc) == 0) {
  38                         if (dev_desc.idVendor == vids[i] &&
  39                                 dev_desc.idProduct == pids[i])
  40                                 return true;
  41                 }
  42         }
  43         return false;
  44 }
  45
  46 int jtag_libusb_open(const uint16_t vids[], const uint16_t pids[],
  47                 struct jtag_libusb_device_handle **out)
  48 {
  49         int cnt, idx, errCode;
  50
  51         if (libusb_init(&jtag_libusb_context) < 0)
  52                 return -ENODEV;
  53
  54         libusb_set_debug(jtag_libusb_context, 3);
  55
  56         cnt = libusb_get_device_list(jtag_libusb_context, &devs);
  57
  58         for (idx = 0; idx < cnt; idx++) {
  59                 if (!jtag_libusb_match(devs[idx], vids, pids))
  60                         continue;
  61
  62                 errCode = libusb_open(devs[idx], out);
  63
  64                 /** Free the device list **/
  65                 libusb_free_device_list(devs, 1);
  66
  67                 if (errCode < 0)
  68                         return errCode;
  69                 return 0;
  70         }
  71         return -ENODEV;
  72 }
  73
  74 void jtag_libusb_close(jtag_libusb_device_handle *dev)
  75 {
  76         /* Close device */
  77         jtag_libusb_close(dev);
  78
  79         libusb_exit(jtag_libusb_context);
  80 }
  81
  82 int jtag_libusb_bulk_write(jtag_libusb_device_handle *dev, int ep, char *bytes,
  83                 int size, int timeout)
  84 {
  85         int transferred = 0;
  86
  87         libusb_bulk_transfer(dev, ep, (unsigned char *)bytes, size,
  88                              &transferred, timeout);
  89         return transferred;
  90 }
  91
  92 int jtag_libusb_bulk_read(jtag_libusb_device_handle *dev, int ep, char *bytes,
  93                 int size, int timeout)
  94 {
  95         int transferred = 0;
  96
  97         libusb_bulk_transfer(dev, ep, (unsigned char *)bytes, size,
  98                              &transferred, timeout);
  99         return transferred;
 100 }
 101
 102 int jtag_libusb_set_configuration(jtag_libusb_device_handle *devh,
 103                 int configuration)
 104 {
 105         struct jtag_libusb_device *udev = jtag_libusb_get_device(devh);
 106         int retCode = -99;
 107
 108         struct libusb_config_descriptor *config = NULL;
 109
 110         libusb_get_config_descriptor(udev, configuration, &config);
 111         retCode = libusb_set_configuration(devh, config->bConfigurationValue);
 112
 113         libusb_free_config_descriptor(config);
 114
 115         return retCode;
 116 }
 117
 118 int jtag_libusb_get_endpoints(struct jtag_libusb_device *udev,
 119                 unsigned int *usb_read_ep,
 120                 unsigned int *usb_write_ep)
 121 {
 122         const struct libusb_interface *inter;
 123         const struct libusb_interface_descriptor *interdesc;
 124         const struct libusb_endpoint_descriptor *epdesc;
 125         struct libusb_config_descriptor *config;
 126
 127         libusb_get_config_descriptor(udev, 0, &config);
 128         for (int i = 0; i < (int)config->bNumInterfaces; i++) {
 129                 inter = &config->interface[i];
 130
 131                 for (int j = 0; j < inter->num_altsetting; j++) {
 132                         interdesc = &inter->altsetting[j];
 133                         for (int k = 0;
 134                                 k < (int)interdesc->bNumEndpoints; k++) {
 135                                 epdesc = &interdesc->endpoint[k];
 136
 137                                 uint8_t epnum = epdesc->bEndpointAddress;
 138                                 bool is_input = epnum & 0x80;
 139                                 LOG_DEBUG("usb ep %s %02x",
 140                                         is_input ? "in" : "out", epnum);
 141
 142                                 if (is_input)
 143                                         *usb_read_ep = epnum;
 144                                 else
 145                                         *usb_write_ep = epnum;
 146                         }
 147                 }
 148         }
 149         libusb_free_config_descriptor(config);
 150
 151         return 0;
 152 }