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  *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 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]; 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         cnt = libusb_get_device_list(jtag_libusb_context, &devs);
  55
  56         for (idx = 0; idx < cnt; idx++) {
  57                 if (!jtag_libusb_match(devs[idx], vids, pids))
  58                         continue;
  59
  60                 errCode = libusb_open(devs[idx], out);
  61
  62                 /** Free the device list **/
  63                 libusb_free_device_list(devs, 1);
  64
  65                 if (errCode < 0)
  66                         return errCode;
  67                 return 0;
  68         }
  69         return -ENODEV;
  70 }
  71
  72 void jtag_libusb_close(jtag_libusb_device_handle *dev)
  73 {
  74         /* Close device */
  75         libusb_close(dev);
  76
  77         libusb_exit(jtag_libusb_context);
  78 }
  79
  80 int jtag_libusb_control_transfer(jtag_libusb_device_handle *dev, uint8_t requestType,
  81                 uint8_t request, uint16_t wValue, uint16_t wIndex, char *bytes,
  82                 uint16_t size, unsigned int timeout)
  83 {
  84         int transferred = 0;
  85
  86         transferred = libusb_control_transfer(dev, requestType, request, wValue, wIndex,
  87                                 (unsigned char *)bytes, size, timeout);
  88
  89         if (transferred < 0)
  90                 transferred = 0;
  91
  92         return transferred;
  93 }
  94
  95 int jtag_libusb_bulk_write(jtag_libusb_device_handle *dev, int ep, char *bytes,
  96                 int size, int timeout)
  97 {
  98         int transferred = 0;
  99
 100         libusb_bulk_transfer(dev, ep, (unsigned char *)bytes, size,
 101                              &transferred, timeout);
 102         return transferred;
 103 }
 104
 105 int jtag_libusb_bulk_read(jtag_libusb_device_handle *dev, int ep, char *bytes,
 106                 int size, int timeout)
 107 {
 108         int transferred = 0;
 109
 110         libusb_bulk_transfer(dev, ep, (unsigned char *)bytes, size,
 111                              &transferred, timeout);
 112         return transferred;
 113 }
 114
 115 int jtag_libusb_set_configuration(jtag_libusb_device_handle *devh,
 116                 int configuration)
 117 {
 118         struct jtag_libusb_device *udev = jtag_libusb_get_device(devh);
 119         int retCode = -99;
 120
 121         struct libusb_config_descriptor *config = NULL;
 122
 123         libusb_get_config_descriptor(udev, configuration, &config);
 124         retCode = libusb_set_configuration(devh, config->bConfigurationValue);
 125
 126         libusb_free_config_descriptor(config);
 127
 128         return retCode;
 129 }
 130
 131 int jtag_libusb_get_endpoints(struct jtag_libusb_device *udev,
 132                 unsigned int *usb_read_ep,
 133                 unsigned int *usb_write_ep)
 134 {
 135         const struct libusb_interface *inter;
 136         const struct libusb_interface_descriptor *interdesc;
 137         const struct libusb_endpoint_descriptor *epdesc;
 138         struct libusb_config_descriptor *config;
 139
 140         libusb_get_config_descriptor(udev, 0, &config);
 141         for (int i = 0; i < (int)config->bNumInterfaces; i++) {
 142                 inter = &config->interface[i];
 143
 144                 for (int j = 0; j < inter->num_altsetting; j++) {
 145                         interdesc = &inter->altsetting[j];
 146                         for (int k = 0;
 147                                 k < (int)interdesc->bNumEndpoints; k++) {
 148                                 epdesc = &interdesc->endpoint[k];
 149
 150                                 uint8_t epnum = epdesc->bEndpointAddress;
 151                                 bool is_input = epnum & 0x80;
 152                                 LOG_DEBUG("usb ep %s %02x",
 153                                         is_input ? "in" : "out", epnum);
 154
 155                                 if (is_input)
 156                                         *usb_read_ep = epnum;
 157                                 else
 158                                         *usb_write_ep = epnum;
 159                         }
 160                 }
 161         }
 162         libusb_free_config_descriptor(config);
 163
 164         return 0;
 165 }