Harald Welte | da432cd | 2019-12-15 19:13:26 +0100 | [diff] [blame] | 1 | /* libosmocore integration with libusb-1.0 |
| 2 | * |
Harald Welte | d462e3f | 2019-12-15 20:04:51 +0100 | [diff] [blame^] | 3 | * (C) 2019-2019 by Harald Welte <laforge@gnumonks.org> |
Harald Welte | da432cd | 2019-12-15 19:13:26 +0100 | [diff] [blame] | 4 | * All Rights Reserved. |
| 5 | * |
| 6 | * SPDX-License-Identifier: GPL-2.0+ |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or |
| 9 | * modify it under the terms of the GNU General Public License |
| 10 | * as published by the Free Software Foundation; either version 2 |
| 11 | * of the License, or (at your option) any later version. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | * GNU General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU General Public License |
| 19 | * along with this program; if not, write to the Free Software |
| 20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
| 21 | */ |
| 22 | #include <errno.h> |
| 23 | #include <unistd.h> |
| 24 | #include <stdlib.h> |
| 25 | #include <stdint.h> |
| 26 | #include <string.h> |
| 27 | #include <poll.h> |
| 28 | |
| 29 | #include <osmocom/core/utils.h> |
| 30 | #include <osmocom/core/logging.h> |
| 31 | #include <osmocom/core/select.h> |
| 32 | #include <osmocom/core/talloc.h> |
| 33 | |
| 34 | #include <libusb.h> |
| 35 | |
Harald Welte | d462e3f | 2019-12-15 20:04:51 +0100 | [diff] [blame^] | 36 | #include <osmocom/usb/libusb.h> |
| 37 | |
Harald Welte | da432cd | 2019-12-15 19:13:26 +0100 | [diff] [blame] | 38 | /*********************************************************************** |
| 39 | * logging integration |
| 40 | ***********************************************************************/ |
| 41 | |
| 42 | #define DLUSB DLINP |
| 43 | |
| 44 | #ifdef LIBUSB_LOG_CB_CONTEXT /* introduced in 1.0.23 */ |
| 45 | static const int usb2logl[] = { |
| 46 | [LIBUSB_LOG_LEVEL_NONE] = LOGL_FATAL, |
| 47 | [LIBUSB_LOG_LEVEL_ERROR] = LOGL_ERROR, |
| 48 | [LIBUSB_LOG_LEVEL_WARNING] = LOGL_NOTICE, |
| 49 | [LIBUSB_LOG_LEVEL_INFO] = LOGL_INFO, |
| 50 | [LIBUSB_LOG_LEVEL_DEBUG] = LOGL_DEBUG, |
| 51 | }; |
| 52 | |
| 53 | /* called by libusb if it wants to log something */ |
| 54 | static void libosmo_usb_log_cb(libusb_context *luctx, enum libusb_log_level level_usb, const char *str) |
| 55 | { |
| 56 | int level = LOGL_NOTICE; |
| 57 | |
| 58 | if (level_usb < ARRAY_SIZE(usb2logl)) |
| 59 | level = usb2logl[level_usb]; |
| 60 | |
| 61 | LOGP(DLUSB, level, "%s", str); |
| 62 | } |
| 63 | #endif /* LIBUSB_LOG_CB_CONTEXT */ |
| 64 | |
| 65 | /*********************************************************************** |
| 66 | * select loop integration |
| 67 | ***********************************************************************/ |
| 68 | |
| 69 | static int osmo_usb_fd_cb(struct osmo_fd *ofd, unsigned int what) |
| 70 | { |
| 71 | libusb_context *luctx = ofd->data; |
| 72 | |
| 73 | /* we assume that we're running Linux v2.6.27 with timerfd support here |
| 74 | * and hence don't have to perform manual timeout handling. See |
| 75 | * "Notes on time-based events" at |
| 76 | * http://libusb.sourceforge.net/api-1.0/group__libusb__poll.html */ |
| 77 | struct timeval zero_tv = { 0, 0 }; |
| 78 | libusb_handle_events_timeout(luctx, &zero_tv); |
| 79 | |
| 80 | return 0; |
| 81 | } |
| 82 | |
| 83 | /* called by libusb if it wants to add a file-descriptor */ |
| 84 | static void osmo_usb_added_cb(int fd, short events, void *user_data) |
| 85 | { |
| 86 | struct osmo_fd *ofd = talloc_zero(OTC_GLOBAL, struct osmo_fd); |
| 87 | libusb_context *luctx = user_data; |
| 88 | unsigned int when = 0; |
| 89 | |
| 90 | if (events & POLLIN) |
| 91 | when |= OSMO_FD_READ; |
| 92 | if (events & POLLOUT) |
| 93 | when |= OSMO_FD_WRITE; |
| 94 | |
| 95 | osmo_fd_setup(ofd, fd, when, osmo_usb_fd_cb, luctx, 0); |
| 96 | osmo_fd_register(ofd); |
| 97 | } |
| 98 | |
| 99 | /* called by libusb if it wants to remove a file-descriptor */ |
| 100 | static void osmo_usb_removed_cb(int fd, void *user_data) |
| 101 | { |
| 102 | struct osmo_fd *ofd = osmo_fd_get_by_fd(fd); |
| 103 | if (!fd) |
| 104 | return; |
| 105 | osmo_fd_unregister(ofd); |
| 106 | talloc_free(ofd); |
| 107 | } |
| 108 | |
Harald Welte | d462e3f | 2019-12-15 20:04:51 +0100 | [diff] [blame^] | 109 | /*********************************************************************** |
| 110 | * utility functions |
| 111 | ***********************************************************************/ |
Harald Welte | da432cd | 2019-12-15 19:13:26 +0100 | [diff] [blame] | 112 | |
Harald Welte | d462e3f | 2019-12-15 20:04:51 +0100 | [diff] [blame^] | 113 | /*! obtain the string representation of the USB device path of given device. |
| 114 | * \param[out] buf Output string buffer |
| 115 | * \param[in] bufsize Size of output string buffer in bytes |
| 116 | * \param[in] dev USB device whose bus path we want to obtain |
| 117 | * \returns pointer to 'buf' in case of success; NULL in case of error */ |
| 118 | char *osmo_libusb_dev_get_path_buf(char *buf, size_t bufsize, libusb_device *dev) |
| 119 | { |
| 120 | #if (defined(LIBUSB_API_VERSION) && LIBUSB_API_VERSION >= 0x01000102) || \ |
| 121 | (defined(LIBUSBX_API_VERSION) && LIBUSBX_API_VERSION >= 0x01000102) |
| 122 | struct osmo_strbuf sb = { .buf = buf, .len = bufsize }; |
| 123 | uint8_t path[8]; |
| 124 | int r,j; |
| 125 | r = libusb_get_port_numbers(dev, path, sizeof(path)); |
| 126 | if (r > 0) { |
| 127 | OSMO_STRBUF_PRINTF(sb, "%d-%d", libusb_get_bus_number(dev), path[0]); |
| 128 | for (j = 1; j < r; j++){ |
| 129 | OSMO_STRBUF_PRINTF(sb, ".%d", path[j]); |
| 130 | } |
| 131 | } |
| 132 | return buf; |
| 133 | #else |
| 134 | # warning "libusb too old - building without USB path support!" |
| 135 | return NULL; |
| 136 | #endif |
| 137 | } |
| 138 | |
| 139 | /*! obtain the string representation of the USB device path of given device. |
| 140 | * \param[in] talloc context from which to dynamically allocate output string buffer |
| 141 | * \param[in] dev USB device whose bus path we want to obtain |
| 142 | * \returns pointer to 'buf' in case of success; NULL in case of error */ |
| 143 | char *osmo_libusb_dev_get_path_c(void *ctx, libusb_device *dev) |
| 144 | { |
| 145 | char *buf = talloc_zero_size(ctx, USB_MAX_PATH_LEN); |
| 146 | if (!buf) |
| 147 | return NULL; |
| 148 | return osmo_libusb_dev_get_path_buf(buf, USB_MAX_PATH_LEN, dev); |
| 149 | } |
| 150 | |
| 151 | static int match_dev_id(const struct libusb_device_descriptor *desc, const struct dev_id *id) |
| 152 | { |
| 153 | if ((desc->idVendor == id->vendor_id) && (desc->idProduct == id->product_id)) |
| 154 | return 1; |
| 155 | return 0; |
| 156 | } |
| 157 | |
| 158 | static int match_dev_ids(const struct libusb_device_descriptor *desc, const struct dev_id *ids) |
| 159 | { |
| 160 | const struct dev_id *id; |
| 161 | |
| 162 | for (id = ids; id->vendor_id || id->product_id; id++) { |
| 163 | if (match_dev_id(desc, id)) |
| 164 | return 1; |
| 165 | } |
| 166 | return 0; |
| 167 | } |
| 168 | |
| 169 | /*! Find USB devices matching the specified list of USB VendorID/ProductIDs |
| 170 | * \param[in] ctx talloc context from which to allocate output data |
| 171 | * \param[in] luctx libusb context on which to operate |
| 172 | * \param[in] dev_ids zero-terminated array of VendorId/ProductId tuples |
| 173 | * \returns array of up to 256 libusb_device pointers; NULL in case of error */ |
| 174 | libusb_device **osmo_libusb_find_matching_usb_devs(void *ctx, struct libusb_context *luctx, |
| 175 | const struct dev_id *dev_ids) |
| 176 | { |
| 177 | libusb_device **list; |
| 178 | libusb_device **out = talloc_zero_array(ctx, libusb_device *, 256); |
| 179 | libusb_device **cur = out; |
| 180 | unsigned int i; |
| 181 | int rc; |
| 182 | |
| 183 | if (!out) |
| 184 | return NULL; |
| 185 | |
| 186 | rc = libusb_get_device_list(luctx, &list); |
| 187 | if (rc <= 0) { |
| 188 | perror("No USB devices found"); |
| 189 | talloc_free(out); |
| 190 | return NULL; |
| 191 | } |
| 192 | |
| 193 | for (i = 0; list[i] != NULL; i++) { |
| 194 | struct libusb_device_descriptor dev_desc; |
| 195 | libusb_device *dev = list[i]; |
| 196 | |
| 197 | rc = libusb_get_device_descriptor(dev, &dev_desc); |
| 198 | if (rc < 0) { |
| 199 | perror("Couldn't get device descriptor\n"); |
| 200 | libusb_unref_device(dev); |
| 201 | continue; |
| 202 | } |
| 203 | |
| 204 | if (match_dev_ids(&dev_desc, dev_ids)) { |
| 205 | *cur = dev; |
| 206 | cur++; |
| 207 | /* overflow check */ |
| 208 | if (cur >= out + 256) |
| 209 | break; |
| 210 | } else |
| 211 | libusb_unref_device(dev); |
| 212 | } |
| 213 | if (cur == out) { |
| 214 | libusb_free_device_list(list, 1); |
| 215 | talloc_free(out); |
| 216 | return NULL; |
| 217 | } |
| 218 | |
| 219 | libusb_free_device_list(list, 0); |
| 220 | return out; |
| 221 | } |
| 222 | |
| 223 | /*! find a matching interface among all interfaces of the given USB device. |
| 224 | * \param[in] dev USB device in which we shall search |
| 225 | * \param[in] class USB Interface Class to look for |
| 226 | * \param[in] sub_class USB Interface Subclass to look for |
| 227 | * \param[in] protocol USB Interface Protocol to look for |
| 228 | * \param[out] out User-allocated array for storing matches |
| 229 | * \param[in] out_len Length of out array |
| 230 | * \returns number of matching interfaces; negative in case of error */ |
| 231 | int osmo_libusb_dev_find_matching_interfaces(libusb_device *dev, int class, int sub_class, |
| 232 | int protocol, struct usb_interface_match *out, |
| 233 | unsigned int out_len) |
| 234 | { |
| 235 | struct libusb_device_descriptor dev_desc; |
| 236 | int rc, i, out_idx = 0; |
| 237 | uint8_t addr; |
| 238 | char pathbuf[USB_MAX_PATH_LEN]; |
| 239 | char *path; |
| 240 | |
| 241 | rc = libusb_get_device_descriptor(dev, &dev_desc); |
| 242 | if (rc < 0) { |
| 243 | perror("Couldn't get device descriptor\n"); |
| 244 | return -EIO; |
| 245 | } |
| 246 | |
| 247 | addr = libusb_get_device_address(dev); |
| 248 | path = osmo_libusb_dev_get_path_buf(pathbuf, sizeof(pathbuf), dev); |
| 249 | |
| 250 | /* iterate over all configurations */ |
| 251 | for (i = 0; i < dev_desc.bNumConfigurations; i++) { |
| 252 | struct libusb_config_descriptor *conf_desc; |
| 253 | int j; |
| 254 | |
| 255 | rc = libusb_get_config_descriptor(dev, i, &conf_desc); |
| 256 | if (rc < 0) { |
| 257 | fprintf(stderr, "Couldn't get config descriptor %u\n", i); |
| 258 | continue; |
| 259 | } |
| 260 | /* iterate over all interfaces */ |
| 261 | for (j = 0; j < conf_desc->bNumInterfaces; j++) { |
| 262 | const struct libusb_interface *intf = &conf_desc->interface[j]; |
| 263 | int k; |
| 264 | /* iterate over all alternate settings */ |
| 265 | for (k = 0; k < intf->num_altsetting; k++) { |
| 266 | const struct libusb_interface_descriptor *if_desc; |
| 267 | if_desc = &intf->altsetting[k]; |
| 268 | if (class >= 0 && if_desc->bInterfaceClass != class) |
| 269 | continue; |
| 270 | if (sub_class >= 0 && if_desc->bInterfaceSubClass != sub_class) |
| 271 | continue; |
| 272 | if (protocol >= 0 && if_desc->bInterfaceProtocol != protocol) |
| 273 | continue; |
| 274 | /* MATCH! */ |
| 275 | out[out_idx].usb_dev = dev; |
| 276 | out[out_idx].vendor = dev_desc.idVendor; |
| 277 | out[out_idx].product = dev_desc.idProduct; |
| 278 | out[out_idx].addr = addr; |
| 279 | strncpy(out[out_idx].path, path, sizeof(out[out_idx].path)-1); |
| 280 | out[out_idx].path[sizeof(out[out_idx].path)-1] = '\0'; |
| 281 | out[out_idx].configuration = conf_desc->bConfigurationValue; |
| 282 | out[out_idx].interface = if_desc->bInterfaceNumber; |
| 283 | out[out_idx].altsetting = if_desc->bAlternateSetting; |
| 284 | out[out_idx].class = if_desc->bInterfaceClass; |
| 285 | out[out_idx].sub_class = if_desc->bInterfaceSubClass; |
| 286 | out[out_idx].protocol = if_desc->bInterfaceProtocol; |
| 287 | out[out_idx].string_idx = if_desc->iInterface; |
| 288 | out_idx++; |
| 289 | if (out_idx >= out_len) |
| 290 | return out_idx; |
| 291 | } |
| 292 | } |
| 293 | } |
| 294 | return out_idx; |
| 295 | } |
| 296 | |
| 297 | /*! find matching interfaces among a list devices of specified VendorId/ProductID tuples. |
| 298 | * \param[in] luctx libusb context on which to operate |
| 299 | * \param[in] dev_ids zero-terminated array of VendorId/ProductId tuples |
| 300 | * \param[in] class USB Interface Class to look for |
| 301 | * \param[in] sub_class USB Interface Subclass to look for |
| 302 | * \param[in] protocol USB Interface Protocol to look for |
| 303 | * \param[out] out User-allocated array for storing matches |
| 304 | * \param[in] out_len Length of out array |
| 305 | * \returns number of matching interfaces; negative in case of error */ |
| 306 | int osmo_libusb_find_matching_interfaces(libusb_context *luctx, const struct dev_id *dev_ids, |
| 307 | int class, int sub_class, int protocol, |
| 308 | struct usb_interface_match *out, unsigned int out_len) |
| 309 | { |
| 310 | struct usb_interface_match *out_cur = out; |
| 311 | unsigned int out_len_remain = out_len; |
| 312 | libusb_device **list; |
| 313 | libusb_device **dev; |
| 314 | |
| 315 | list = osmo_libusb_find_matching_usb_devs(NULL, luctx, dev_ids); |
| 316 | if (!list) |
| 317 | return 0; |
| 318 | |
| 319 | for (dev = list; *dev; dev++) { |
| 320 | int rc; |
| 321 | |
| 322 | #if 0 |
| 323 | struct libusb_device_descriptor dev_desc; |
| 324 | uint8_t ports[8]; |
| 325 | uint8_t addr; |
| 326 | rc = libusb_get_device_descriptor(*dev, &dev_desc); |
| 327 | if (rc < 0) { |
| 328 | perror("Cannot get device descriptor"); |
| 329 | continue; |
| 330 | } |
| 331 | |
| 332 | addr = libusb_get_device_address(*dev); |
| 333 | |
| 334 | rc = libusb_get_port_numbers(*dev, ports, sizeof(ports)); |
| 335 | if (rc < 0) { |
| 336 | perror("Cannot get device path"); |
| 337 | continue; |
| 338 | } |
| 339 | |
| 340 | printf("Found USB Device %04x:%04x at address %d\n", |
| 341 | dev_desc.idVendor, dev_desc.idProduct, addr); |
| 342 | #endif |
| 343 | |
| 344 | rc = osmo_libusb_dev_find_matching_interfaces(*dev, class, sub_class, |
| 345 | protocol, out_cur, out_len_remain); |
| 346 | if (rc < 0) |
| 347 | continue; |
| 348 | out_cur += rc; |
| 349 | out_len_remain -= rc; |
| 350 | |
| 351 | } |
| 352 | |
| 353 | /* unref / free list */ |
| 354 | for (dev = list; *dev; dev++) |
| 355 | libusb_unref_device(*dev); |
| 356 | talloc_free(list); |
| 357 | |
| 358 | return out_len - out_len_remain; |
| 359 | } |
| 360 | |
| 361 | /*! open matching USB device and claim interface |
| 362 | * \param[in] ctx talloc context to use for related allocations |
| 363 | * \param[in] luctx libusb context on which to operate |
| 364 | * \param[in] ifm interface match describing interface to claim |
| 365 | * \returns libusb device chandle on success; NULL on error */ |
| 366 | libusb_device_handle *osmo_libusb_open_claim_interface(void *ctx, libusb_context *luctx, |
| 367 | const struct usb_interface_match *ifm) |
| 368 | { |
| 369 | int rc, config; |
| 370 | struct dev_id dev_ids[] = { { ifm->vendor, ifm->product }, { 0, 0 } }; |
| 371 | libusb_device **list; |
| 372 | libusb_device **dev; |
| 373 | libusb_device_handle *usb_devh = NULL; |
| 374 | |
| 375 | list = osmo_libusb_find_matching_usb_devs(ctx, luctx, dev_ids); |
| 376 | if (!list) { |
| 377 | perror("No USB device with matching VID/PID"); |
| 378 | return NULL; |
| 379 | } |
| 380 | |
| 381 | for (dev = list; *dev; dev++) { |
| 382 | int addr; |
| 383 | char pathbuf[USB_MAX_PATH_LEN]; |
| 384 | char *path; |
| 385 | |
| 386 | addr = libusb_get_device_address(*dev); |
| 387 | path = osmo_libusb_dev_get_path_buf(pathbuf, sizeof(pathbuf), *dev); |
| 388 | if ((ifm->addr && addr == ifm->addr) || |
| 389 | (strlen(ifm->path) && !strcmp(path, ifm->path))) { |
| 390 | rc = libusb_open(*dev, &usb_devh); |
| 391 | if (rc < 0) { |
| 392 | fprintf(stderr, "Cannot open device: %s\n", libusb_error_name(rc)); |
| 393 | usb_devh = NULL; |
| 394 | break; |
| 395 | } |
| 396 | rc = libusb_get_configuration(usb_devh, &config); |
| 397 | if (rc < 0) { |
| 398 | fprintf(stderr, "Cannot get current configuration: %s\n", libusb_error_name(rc)); |
| 399 | libusb_close(usb_devh); |
| 400 | usb_devh = NULL; |
| 401 | break; |
| 402 | } |
| 403 | if (config != ifm->configuration) { |
| 404 | rc = libusb_set_configuration(usb_devh, ifm->configuration); |
| 405 | if (rc < 0) { |
| 406 | fprintf(stderr, "Cannot set configuration: %s\n", libusb_error_name(rc)); |
| 407 | libusb_close(usb_devh); |
| 408 | usb_devh = NULL; |
| 409 | break; |
| 410 | } |
| 411 | } |
| 412 | rc = libusb_claim_interface(usb_devh, ifm->interface); |
| 413 | if (rc < 0) { |
| 414 | fprintf(stderr, "Cannot claim interface: %s\n", libusb_error_name(rc)); |
| 415 | libusb_close(usb_devh); |
| 416 | usb_devh = NULL; |
| 417 | break; |
| 418 | } |
| 419 | rc = libusb_set_interface_alt_setting(usb_devh, ifm->interface, ifm->altsetting); |
| 420 | if (rc < 0) { |
| 421 | fprintf(stderr, "Cannot set interface altsetting: %s\n", libusb_error_name(rc)); |
| 422 | libusb_release_interface(usb_devh, ifm->interface); |
| 423 | libusb_close(usb_devh); |
| 424 | usb_devh = NULL; |
| 425 | break; |
| 426 | } |
| 427 | } |
| 428 | } |
| 429 | |
| 430 | /* unref / free list */ |
| 431 | for (dev = list; *dev; dev++) |
| 432 | libusb_unref_device(*dev); |
| 433 | talloc_free(list); |
| 434 | |
| 435 | return usb_devh; |
| 436 | } |
| 437 | |
| 438 | /*! obtain the endpoint addresses for a given USB interface. |
| 439 | * \param[in] devh USB device handle on which to operate |
| 440 | * \param[in] if_num USB Interface number on which to operate |
| 441 | * \param[out] out user-provided storage for OUT endpoint number |
| 442 | * \param[out] in user-provided storage for IN endpoint number |
| 443 | * \param[out] irq user-provided storage for IRQ endpoint number |
| 444 | * \returns 0 in case of success; negative in case of error */ |
| 445 | int osmo_libusb_get_ep_addrs(libusb_device_handle *devh, unsigned int if_num, |
| 446 | uint8_t *out, uint8_t *in, uint8_t *irq) |
| 447 | { |
| 448 | libusb_device *dev = libusb_get_device(devh); |
| 449 | struct libusb_config_descriptor *cdesc; |
| 450 | const struct libusb_interface_descriptor *idesc; |
| 451 | const struct libusb_interface *iface; |
| 452 | int rc, l; |
| 453 | |
| 454 | rc = libusb_get_active_config_descriptor(dev, &cdesc); |
| 455 | if (rc < 0) |
| 456 | return rc; |
| 457 | |
| 458 | iface = &cdesc->interface[if_num]; |
| 459 | /* FIXME: we assume there's no altsetting */ |
| 460 | idesc = &iface->altsetting[0]; |
| 461 | |
| 462 | for (l = 0; l < idesc->bNumEndpoints; l++) { |
| 463 | const struct libusb_endpoint_descriptor *edesc = &idesc->endpoint[l]; |
| 464 | switch (edesc->bmAttributes & 3) { |
| 465 | case LIBUSB_TRANSFER_TYPE_BULK: |
| 466 | if (edesc->bEndpointAddress & 0x80) { |
| 467 | if (in) |
| 468 | *in = edesc->bEndpointAddress; |
| 469 | } else { |
| 470 | if (out) |
| 471 | *out = edesc->bEndpointAddress; |
| 472 | } |
| 473 | break; |
| 474 | case LIBUSB_TRANSFER_TYPE_INTERRUPT: |
| 475 | if (irq) |
| 476 | *irq = edesc->bEndpointAddress; |
| 477 | break; |
| 478 | default: |
| 479 | break; |
| 480 | } |
| 481 | } |
| 482 | return 0; |
| 483 | } |
Harald Welte | da432cd | 2019-12-15 19:13:26 +0100 | [diff] [blame] | 484 | /*********************************************************************** |
| 485 | * initialization |
| 486 | ***********************************************************************/ |
| 487 | |
| 488 | int osmo_libusb_init(libusb_context **pluctx) |
| 489 | { |
| 490 | libusb_context *luctx = NULL; |
| 491 | int rc; |
| 492 | |
| 493 | rc = libusb_init(pluctx); |
| 494 | if (rc != 0) |
| 495 | return rc; |
| 496 | |
| 497 | if (pluctx) |
| 498 | luctx = *pluctx; |
| 499 | |
| 500 | #ifdef LIBUSB_LOG_CB_CONTEXT /* introduced in 1.0.23 */ |
| 501 | libusb_set_log_cb(luctx, &libosmo_usb_log_cb, LIBUSB_LOG_CB_CONTEXT); |
| 502 | #endif |
| 503 | |
| 504 | libusb_set_pollfd_notifiers(luctx, osmo_usb_added_cb, osmo_usb_removed_cb, luctx); |
| 505 | |
| 506 | return 0; |
| 507 | } |
| 508 | |
| 509 | void osmo_libusb_exit(libusb_context *luctx) |
| 510 | { |
| 511 | /* we just assume libusb is cleaning up all the osmo_Fd's we've allocated */ |
| 512 | libusb_exit(luctx); |
| 513 | } |