src/jtag/drivers/libusb_helper.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2
   3 /***************************************************************************
   4  *   Copyright (C) 2009 by Zachary T Welch <zw@superlucidity.net>          *
   5  *                                                                         *
   6  *   Copyright (C) 2011 by Mauro Gamba <maurillo71@gmail.com>              *
   7  ***************************************************************************/
   8
   9 #ifdef HAVE_CONFIG_H
  10 #include "config.h"
  11 #endif
  12
  13 #include <string.h>
  14
  15 #include <helper/log.h>
  16 #include <jtag/adapter.h>
  17 #include "libusb_helper.h"
  18
  19 /*
  20  * comment from libusb:
  21  * As per the USB 3.0 specs, the current maximum limit for the depth is 7.
  22  */
  23 #define MAX_USB_PORTS   7
  24
  25 static struct libusb_context *jtag_libusb_context; /**< Libusb context **/
  26 static struct libusb_device **devs; /**< The usb device list **/
  27
  28 static int jtag_libusb_error(int err)
  29 {
  30         switch (err) {
  31         case LIBUSB_SUCCESS:
  32                 return ERROR_OK;
  33         case LIBUSB_ERROR_TIMEOUT:
  34                 return ERROR_TIMEOUT_REACHED;
  35         case LIBUSB_ERROR_IO:
  36         case LIBUSB_ERROR_INVALID_PARAM:
  37         case LIBUSB_ERROR_ACCESS:
  38         case LIBUSB_ERROR_NO_DEVICE:
  39         case LIBUSB_ERROR_NOT_FOUND:
  40         case LIBUSB_ERROR_BUSY:
  41         case LIBUSB_ERROR_OVERFLOW:
  42         case LIBUSB_ERROR_PIPE:
  43         case LIBUSB_ERROR_INTERRUPTED:
  44         case LIBUSB_ERROR_NO_MEM:
  45         case LIBUSB_ERROR_NOT_SUPPORTED:
  46         case LIBUSB_ERROR_OTHER:
  47                 return ERROR_FAIL;
  48         default:
  49                 return ERROR_FAIL;
  50         }
  51 }
  52
  53 static bool jtag_libusb_match_ids(struct libusb_device_descriptor *dev_desc,
  54                 const uint16_t vids[], const uint16_t pids[])
  55 {
  56         for (unsigned i = 0; vids[i]; i++) {
  57                 if (dev_desc->idVendor == vids[i] &&
  58                         dev_desc->idProduct == pids[i]) {
  59                         return true;
  60                 }
  61         }
  62         return false;
  63 }
  64
  65 #ifdef HAVE_LIBUSB_GET_PORT_NUMBERS
  66 static bool jtag_libusb_location_equal(struct libusb_device *device)
  67 {
  68         uint8_t port_path[MAX_USB_PORTS];
  69         uint8_t dev_bus;
  70         int path_len;
  71
  72         path_len = libusb_get_port_numbers(device, port_path, MAX_USB_PORTS);
  73         if (path_len == LIBUSB_ERROR_OVERFLOW) {
  74                 LOG_WARNING("cannot determine path to usb device! (more than %i ports in path)\n",
  75                         MAX_USB_PORTS);
  76                 return false;
  77         }
  78         dev_bus = libusb_get_bus_number(device);
  79
  80         return adapter_usb_location_equal(dev_bus, port_path, path_len);
  81 }
  82 #else /* HAVE_LIBUSB_GET_PORT_NUMBERS */
  83 static bool jtag_libusb_location_equal(struct libusb_device *device)
  84 {
  85         return true;
  86 }
  87 #endif /* HAVE_LIBUSB_GET_PORT_NUMBERS */
  88
  89
  90 /* Returns true if the string descriptor indexed by str_index in device matches string */
  91 static bool string_descriptor_equal(struct libusb_device_handle *device, uint8_t str_index,
  92                                                                         const char *string)
  93 {
  94         int retval;
  95         bool matched;
  96         char desc_string[256+1]; /* Max size of string descriptor */
  97
  98         if (str_index == 0)
  99                 return false;
 100
 101         retval = libusb_get_string_descriptor_ascii(device, str_index,
 102                         (unsigned char *)desc_string, sizeof(desc_string)-1);
 103         if (retval < 0) {
 104                 LOG_ERROR("libusb_get_string_descriptor_ascii() failed with %d", retval);
 105                 return false;
 106         }
 107
 108         /* Null terminate descriptor string in case it needs to be logged. */
 109         desc_string[sizeof(desc_string)-1] = '\0';
 110
 111         matched = strncmp(string, desc_string, sizeof(desc_string)) == 0;
 112         if (!matched)
 113                 LOG_DEBUG("Device serial number '%s' doesn't match requested serial '%s'",
 114                         desc_string, string);
 115         return matched;
 116 }
 117
 118 static bool jtag_libusb_match_serial(struct libusb_device_handle *device,
 119                 struct libusb_device_descriptor *dev_desc, const char *serial,
 120                 adapter_get_alternate_serial_fn adapter_get_alternate_serial)
 121 {
 122         if (string_descriptor_equal(device, dev_desc->iSerialNumber, serial))
 123                 return true;
 124
 125         /* check the alternate serial helper */
 126         if (!adapter_get_alternate_serial)
 127                 return false;
 128
 129         /* get the alternate serial */
 130         char *alternate_serial = adapter_get_alternate_serial(device, dev_desc);
 131
 132         /* check possible failures */
 133         if (!alternate_serial)
 134                 return false;
 135
 136         /* then compare and free the alternate serial */
 137         bool match = false;
 138         if (strcmp(serial, alternate_serial) == 0)
 139                 match = true;
 140         else
 141                 LOG_DEBUG("Device alternate serial number '%s' doesn't match requested serial '%s'",
 142                                 alternate_serial, serial);
 143
 144         free(alternate_serial);
 145         return match;
 146 }
 147
 148 int jtag_libusb_open(const uint16_t vids[], const uint16_t pids[],
 149                 struct libusb_device_handle **out,
 150                 adapter_get_alternate_serial_fn adapter_get_alternate_serial)
 151 {
 152         int cnt, idx, err_code;
 153         int retval = ERROR_FAIL;
 154         bool serial_mismatch = false;
 155         struct libusb_device_handle *libusb_handle = NULL;
 156         const char *serial = adapter_get_required_serial();
 157
 158         if (libusb_init(&jtag_libusb_context) < 0)
 159                 return ERROR_FAIL;
 160
 161         cnt = libusb_get_device_list(jtag_libusb_context, &devs);
 162
 163         for (idx = 0; idx < cnt; idx++) {
 164                 struct libusb_device_descriptor dev_desc;
 165
 166                 if (libusb_get_device_descriptor(devs[idx], &dev_desc) != 0)
 167                         continue;
 168
 169                 if (!jtag_libusb_match_ids(&dev_desc, vids, pids))
 170                         continue;
 171
 172                 if (adapter_usb_get_location() && !jtag_libusb_location_equal(devs[idx]))
 173                         continue;
 174
 175                 err_code = libusb_open(devs[idx], &libusb_handle);
 176
 177                 if (err_code) {
 178                         LOG_ERROR("libusb_open() failed with %s",
 179                                   libusb_error_name(err_code));
 180                         continue;
 181                 }
 182
 183                 /* Device must be open to use libusb_get_string_descriptor_ascii. */
 184                 if (serial &&
 185                                 !jtag_libusb_match_serial(libusb_handle, &dev_desc, serial, adapter_get_alternate_serial)) {
 186                         serial_mismatch = true;
 187                         libusb_close(libusb_handle);
 188                         continue;
 189                 }
 190
 191                 /* Success. */
 192                 *out = libusb_handle;
 193                 retval = ERROR_OK;
 194                 serial_mismatch = false;
 195                 break;
 196         }
 197         if (cnt >= 0)
 198                 libusb_free_device_list(devs, 1);
 199
 200         if (serial_mismatch)
 201                 LOG_INFO("No device matches the serial string");
 202
 203         if (retval != ERROR_OK)
 204                 libusb_exit(jtag_libusb_context);
 205
 206         return retval;
 207 }
 208
 209 void jtag_libusb_close(struct libusb_device_handle *dev)
 210 {
 211         /* Close device */
 212         libusb_close(dev);
 213
 214         libusb_exit(jtag_libusb_context);
 215 }
 216
 217 int jtag_libusb_control_transfer(struct libusb_device_handle *dev, uint8_t request_type,
 218                 uint8_t request, uint16_t value, uint16_t index, char *bytes,
 219                 uint16_t size, unsigned int timeout)
 220 {
 221         int transferred = 0;
 222
 223         transferred = libusb_control_transfer(dev, request_type, request, value, index,
 224                                 (unsigned char *)bytes, size, timeout);
 225
 226         if (transferred < 0)
 227                 transferred = 0;
 228
 229         return transferred;
 230 }
 231
 232 int jtag_libusb_bulk_write(struct libusb_device_handle *dev, int ep, char *bytes,
 233                            int size, int timeout, int *transferred)
 234 {
 235         int ret;
 236
 237         *transferred = 0;
 238
 239         ret = libusb_bulk_transfer(dev, ep, (unsigned char *)bytes, size,
 240                                    transferred, timeout);
 241         if (ret != LIBUSB_SUCCESS) {
 242                 LOG_ERROR("libusb_bulk_write error: %s", libusb_error_name(ret));
 243                 return jtag_libusb_error(ret);
 244         }
 245
 246         return ERROR_OK;
 247 }
 248
 249 int jtag_libusb_bulk_read(struct libusb_device_handle *dev, int ep, char *bytes,
 250                           int size, int timeout, int *transferred)
 251 {
 252         int ret;
 253
 254         *transferred = 0;
 255
 256         ret = libusb_bulk_transfer(dev, ep, (unsigned char *)bytes, size,
 257                                    transferred, timeout);
 258         if (ret != LIBUSB_SUCCESS) {
 259                 LOG_ERROR("libusb_bulk_read error: %s", libusb_error_name(ret));
 260                 return jtag_libusb_error(ret);
 261         }
 262
 263         return ERROR_OK;
 264 }
 265
 266 int jtag_libusb_set_configuration(struct libusb_device_handle *devh,
 267                 int configuration)
 268 {
 269         struct libusb_device *udev = libusb_get_device(devh);
 270         int retval = -99;
 271
 272         struct libusb_config_descriptor *config = NULL;
 273         int current_config = -1;
 274
 275         retval = libusb_get_configuration(devh, &current_config);
 276         if (retval != 0)
 277                 return retval;
 278
 279         retval = libusb_get_config_descriptor(udev, configuration, &config);
 280         if (retval != 0 || !config)
 281                 return retval;
 282
 283         /* Only change the configuration if it is not already set to the
 284            same one. Otherwise this issues a lightweight reset and hangs
 285            LPC-Link2 with JLink firmware. */
 286         if (current_config != config->bConfigurationValue)
 287                 retval = libusb_set_configuration(devh, config->bConfigurationValue);
 288
 289         libusb_free_config_descriptor(config);
 290
 291         return retval;
 292 }
 293
 294 int jtag_libusb_choose_interface(struct libusb_device_handle *devh,
 295                 unsigned int *usb_read_ep,
 296                 unsigned int *usb_write_ep,
 297                 int bclass, int subclass, int protocol, int trans_type)
 298 {
 299         struct libusb_device *udev = libusb_get_device(devh);
 300         const struct libusb_interface *inter;
 301         const struct libusb_interface_descriptor *interdesc;
 302         const struct libusb_endpoint_descriptor *epdesc;
 303         struct libusb_config_descriptor *config;
 304
 305         *usb_read_ep = *usb_write_ep = 0;
 306
 307         libusb_get_config_descriptor(udev, 0, &config);
 308         for (int i = 0; i < (int)config->bNumInterfaces; i++) {
 309                 inter = &config->interface[i];
 310
 311                 interdesc = &inter->altsetting[0];
 312                 for (int k = 0;
 313                      k < (int)interdesc->bNumEndpoints; k++) {
 314                         if ((bclass > 0 && interdesc->bInterfaceClass != bclass) ||
 315                             (subclass > 0 && interdesc->bInterfaceSubClass != subclass) ||
 316                             (protocol > 0 && interdesc->bInterfaceProtocol != protocol))
 317                                 continue;
 318
 319                         epdesc = &interdesc->endpoint[k];
 320                         if (trans_type > 0 && (epdesc->bmAttributes & 0x3) != trans_type)
 321                                 continue;
 322
 323                         uint8_t epnum = epdesc->bEndpointAddress;
 324                         bool is_input = epnum & 0x80;
 325                         LOG_DEBUG("usb ep %s %02x",
 326                                   is_input ? "in" : "out", epnum);
 327
 328                         if (is_input)
 329                                 *usb_read_ep = epnum;
 330                         else
 331                                 *usb_write_ep = epnum;
 332
 333                         if (*usb_read_ep && *usb_write_ep) {
 334                                 LOG_DEBUG("Claiming interface %d", (int)interdesc->bInterfaceNumber);
 335                                 libusb_claim_interface(devh, (int)interdesc->bInterfaceNumber);
 336                                 libusb_free_config_descriptor(config);
 337                                 return ERROR_OK;
 338                         }
 339                 }
 340         }
 341         libusb_free_config_descriptor(config);
 342
 343         return ERROR_FAIL;
 344 }
 345
 346 int jtag_libusb_get_pid(struct libusb_device *dev, uint16_t *pid)
 347 {
 348         struct libusb_device_descriptor dev_desc;
 349
 350         if (libusb_get_device_descriptor(dev, &dev_desc) == 0) {
 351                 *pid = dev_desc.idProduct;
 352
 353                 return ERROR_OK;
 354         }
 355
 356         return ERROR_FAIL;
 357 }
 358
 359 int jtag_libusb_handle_events_completed(int *completed)
 360 {
 361         return libusb_handle_events_completed(jtag_libusb_context, completed);
 362 }