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1 | /* | |
2 | * This file is part of the libsigrok project. | |
3 | * | |
4 | * Copyright (C) 2012 Uwe Hermann <uwe@hermann-uwe.de> | |
5 | * Copyright (C) 2012 Bert Vermeulen <bert@biot.com> | |
6 | * Copyright (C) 2015 Daniel Elstner <daniel.kitta@gmail.com> | |
7 | * | |
8 | * This program is free software: you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation, either version 3 of the License, or | |
11 | * (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, see <http://www.gnu.org/licenses/>. | |
20 | */ | |
21 | ||
22 | #include <config.h> | |
23 | #include <stdlib.h> | |
24 | #include <memory.h> | |
25 | #include <glib.h> | |
26 | #include <libusb.h> | |
27 | #include <libsigrok/libsigrok.h> | |
28 | #include "libsigrok-internal.h" | |
29 | ||
30 | /* SR_CONF_CONN takes one of these: */ | |
31 | #define CONN_USB_VIDPID "^([0-9a-fA-F]{4})\\.([0-9a-fA-F]{4})$" | |
32 | #define CONN_USB_BUSADDR "^(\\d+)\\.(\\d+)$" | |
33 | ||
34 | #define LOG_PREFIX "usb" | |
35 | ||
36 | #if !HAVE_LIBUSB_OS_HANDLE | |
37 | typedef int libusb_os_handle; | |
38 | #endif | |
39 | ||
40 | /** Custom GLib event source for libusb I/O. | |
41 | */ | |
42 | struct usb_source { | |
43 | GSource base; | |
44 | ||
45 | int64_t timeout_us; | |
46 | int64_t due_us; | |
47 | ||
48 | /* Needed to keep track of installed sources */ | |
49 | struct sr_session *session; | |
50 | ||
51 | struct libusb_context *usb_ctx; | |
52 | GPtrArray *pollfds; | |
53 | }; | |
54 | ||
55 | /** USB event source prepare() method. | |
56 | */ | |
57 | static gboolean usb_source_prepare(GSource *source, int *timeout) | |
58 | { | |
59 | int64_t now_us, usb_due_us; | |
60 | struct usb_source *usource; | |
61 | struct timeval usb_timeout; | |
62 | int remaining_ms; | |
63 | int ret; | |
64 | ||
65 | usource = (struct usb_source *)source; | |
66 | ||
67 | ret = libusb_get_next_timeout(usource->usb_ctx, &usb_timeout); | |
68 | if (G_UNLIKELY(ret < 0)) { | |
69 | sr_err("Failed to get libusb timeout: %s", | |
70 | libusb_error_name(ret)); | |
71 | } | |
72 | now_us = g_source_get_time(source); | |
73 | ||
74 | if (usource->due_us == 0) { | |
75 | /* First-time initialization of the expiration time */ | |
76 | usource->due_us = now_us + usource->timeout_us; | |
77 | } | |
78 | if (ret == 1) { | |
79 | usb_due_us = (int64_t)usb_timeout.tv_sec * G_USEC_PER_SEC | |
80 | + usb_timeout.tv_usec + now_us; | |
81 | if (usb_due_us < usource->due_us) | |
82 | usource->due_us = usb_due_us; | |
83 | } | |
84 | if (usource->due_us != INT64_MAX) | |
85 | remaining_ms = (MAX(0, usource->due_us - now_us) + 999) / 1000; | |
86 | else | |
87 | remaining_ms = -1; | |
88 | ||
89 | *timeout = remaining_ms; | |
90 | ||
91 | return (remaining_ms == 0); | |
92 | } | |
93 | ||
94 | /** USB event source check() method. | |
95 | */ | |
96 | static gboolean usb_source_check(GSource *source) | |
97 | { | |
98 | struct usb_source *usource; | |
99 | GPollFD *pollfd; | |
100 | unsigned int revents; | |
101 | unsigned int i; | |
102 | ||
103 | usource = (struct usb_source *)source; | |
104 | revents = 0; | |
105 | ||
106 | for (i = 0; i < usource->pollfds->len; i++) { | |
107 | pollfd = g_ptr_array_index(usource->pollfds, i); | |
108 | revents |= pollfd->revents; | |
109 | } | |
110 | return (revents != 0 || (usource->due_us != INT64_MAX | |
111 | && usource->due_us <= g_source_get_time(source))); | |
112 | } | |
113 | ||
114 | /** USB event source dispatch() method. | |
115 | */ | |
116 | static gboolean usb_source_dispatch(GSource *source, | |
117 | GSourceFunc callback, void *user_data) | |
118 | { | |
119 | struct usb_source *usource; | |
120 | GPollFD *pollfd; | |
121 | unsigned int revents; | |
122 | unsigned int i; | |
123 | gboolean keep; | |
124 | ||
125 | usource = (struct usb_source *)source; | |
126 | revents = 0; | |
127 | /* | |
128 | * This is somewhat arbitrary, but drivers use revents to distinguish | |
129 | * actual I/O from timeouts. When we remove the user timeout from the | |
130 | * driver API, this will no longer be needed. | |
131 | */ | |
132 | for (i = 0; i < usource->pollfds->len; i++) { | |
133 | pollfd = g_ptr_array_index(usource->pollfds, i); | |
134 | revents |= pollfd->revents; | |
135 | } | |
136 | ||
137 | if (!callback) { | |
138 | sr_err("Callback not set, cannot dispatch event."); | |
139 | return G_SOURCE_REMOVE; | |
140 | } | |
141 | keep = (*SR_RECEIVE_DATA_CALLBACK(callback))(-1, revents, user_data); | |
142 | ||
143 | if (G_LIKELY(keep) && G_LIKELY(!g_source_is_destroyed(source))) { | |
144 | if (usource->timeout_us >= 0) | |
145 | usource->due_us = g_source_get_time(source) | |
146 | + usource->timeout_us; | |
147 | else | |
148 | usource->due_us = INT64_MAX; | |
149 | } | |
150 | return keep; | |
151 | } | |
152 | ||
153 | /** USB event source finalize() method. | |
154 | */ | |
155 | static void usb_source_finalize(GSource *source) | |
156 | { | |
157 | struct usb_source *usource; | |
158 | ||
159 | usource = (struct usb_source *)source; | |
160 | ||
161 | sr_spew("%s", __func__); | |
162 | ||
163 | libusb_set_pollfd_notifiers(usource->usb_ctx, NULL, NULL, NULL); | |
164 | ||
165 | g_ptr_array_unref(usource->pollfds); | |
166 | usource->pollfds = NULL; | |
167 | ||
168 | sr_session_source_destroyed(usource->session, | |
169 | usource->usb_ctx, source); | |
170 | } | |
171 | ||
172 | /** Callback invoked when a new libusb FD should be added to the poll set. | |
173 | */ | |
174 | static LIBUSB_CALL void usb_pollfd_added(libusb_os_handle fd, | |
175 | short events, void *user_data) | |
176 | { | |
177 | struct usb_source *usource; | |
178 | GPollFD *pollfd; | |
179 | ||
180 | usource = user_data; | |
181 | ||
182 | if (G_UNLIKELY(g_source_is_destroyed(&usource->base))) | |
183 | return; | |
184 | ||
185 | pollfd = g_slice_new(GPollFD); | |
186 | #ifdef _WIN32 | |
187 | events = G_IO_IN; | |
188 | #endif | |
189 | pollfd->fd = (gintptr)fd; | |
190 | pollfd->events = events; | |
191 | pollfd->revents = 0; | |
192 | ||
193 | g_ptr_array_add(usource->pollfds, pollfd); | |
194 | g_source_add_poll(&usource->base, pollfd); | |
195 | } | |
196 | ||
197 | /** Callback invoked when a libusb FD should be removed from the poll set. | |
198 | */ | |
199 | static LIBUSB_CALL void usb_pollfd_removed(libusb_os_handle fd, void *user_data) | |
200 | { | |
201 | struct usb_source *usource; | |
202 | GPollFD *pollfd; | |
203 | unsigned int i; | |
204 | ||
205 | usource = user_data; | |
206 | ||
207 | if (G_UNLIKELY(g_source_is_destroyed(&usource->base))) | |
208 | return; | |
209 | ||
210 | /* It's likely that the removed poll FD is at the end. | |
211 | */ | |
212 | for (i = usource->pollfds->len; G_LIKELY(i > 0); i--) { | |
213 | pollfd = g_ptr_array_index(usource->pollfds, i - 1); | |
214 | ||
215 | if ((libusb_os_handle)pollfd->fd == fd) { | |
216 | g_source_remove_poll(&usource->base, pollfd); | |
217 | g_ptr_array_remove_index_fast(usource->pollfds, i - 1); | |
218 | return; | |
219 | } | |
220 | } | |
221 | sr_err("FD to be removed (%" G_GINTPTR_FORMAT | |
222 | ") not found in event source poll set.", (gintptr)fd); | |
223 | } | |
224 | ||
225 | /** Destroy notify callback for FDs maintained by the USB event source. | |
226 | */ | |
227 | static void usb_source_free_pollfd(void *data) | |
228 | { | |
229 | g_slice_free(GPollFD, data); | |
230 | } | |
231 | ||
232 | /** Create an event source for libusb I/O. | |
233 | * | |
234 | * TODO: The combination of the USB I/O source with a user timeout is | |
235 | * conceptually broken. The user timeout supplied here is completely | |
236 | * unrelated to I/O -- the actual I/O timeout is set when submitting | |
237 | * a USB transfer. | |
238 | * The sigrok drivers generally use the timeout to poll device state. | |
239 | * Usually, this polling can be sensibly done only when there is no | |
240 | * active USB transfer -- i.e. it's actually mutually exclusive with | |
241 | * waiting for transfer completion. | |
242 | * Thus, the user timeout should be removed from the USB event source | |
243 | * API at some point. Instead, drivers should install separate timer | |
244 | * event sources for their polling needs. | |
245 | * | |
246 | * @param session The session the event source belongs to. | |
247 | * @param usb_ctx The libusb context for which to handle events. | |
248 | * @param timeout_ms The timeout interval in ms, or -1 to wait indefinitely. | |
249 | * @return A new event source object, or NULL on failure. | |
250 | */ | |
251 | static GSource *usb_source_new(struct sr_session *session, | |
252 | struct libusb_context *usb_ctx, int timeout_ms) | |
253 | { | |
254 | static GSourceFuncs usb_source_funcs = { | |
255 | .prepare = &usb_source_prepare, | |
256 | .check = &usb_source_check, | |
257 | .dispatch = &usb_source_dispatch, | |
258 | .finalize = &usb_source_finalize | |
259 | }; | |
260 | GSource *source; | |
261 | struct usb_source *usource; | |
262 | const struct libusb_pollfd **upollfds, **upfd; | |
263 | ||
264 | upollfds = libusb_get_pollfds(usb_ctx); | |
265 | if (!upollfds) { | |
266 | sr_err("Failed to get libusb file descriptors."); | |
267 | return NULL; | |
268 | } | |
269 | source = g_source_new(&usb_source_funcs, sizeof(struct usb_source)); | |
270 | usource = (struct usb_source *)source; | |
271 | ||
272 | g_source_set_name(source, "usb"); | |
273 | ||
274 | if (timeout_ms >= 0) { | |
275 | usource->timeout_us = 1000 * (int64_t)timeout_ms; | |
276 | usource->due_us = 0; | |
277 | } else { | |
278 | usource->timeout_us = -1; | |
279 | usource->due_us = INT64_MAX; | |
280 | } | |
281 | usource->session = session; | |
282 | usource->usb_ctx = usb_ctx; | |
283 | usource->pollfds = g_ptr_array_new_full(8, &usb_source_free_pollfd); | |
284 | ||
285 | for (upfd = upollfds; *upfd != NULL; upfd++) | |
286 | usb_pollfd_added((*upfd)->fd, (*upfd)->events, usource); | |
287 | ||
288 | #if (LIBUSB_API_VERSION >= 0x01000104) | |
289 | libusb_free_pollfds(upollfds); | |
290 | #else | |
291 | free(upollfds); | |
292 | #endif | |
293 | libusb_set_pollfd_notifiers(usb_ctx, | |
294 | &usb_pollfd_added, &usb_pollfd_removed, usource); | |
295 | ||
296 | return source; | |
297 | } | |
298 | ||
299 | /** | |
300 | * Extract VID:PID or bus.addr from a connection string. | |
301 | * | |
302 | * @param[in] conn Connection string. | |
303 | * @param[out] vid Pointer to extracted vendor ID. Can be #NULL. | |
304 | * @param[out] pid Pointer to extracted product ID. Can be #NULL. | |
305 | * @param[out] bus Pointer to extracted bus number. Can be #NULL. | |
306 | * @param[out] addr Pointer to extracted device number. Can be #NULL. | |
307 | * | |
308 | * @return SR_OK when parsing succeeded, SR_ERR* otherwise. | |
309 | * | |
310 | * @private | |
311 | * | |
312 | * The routine fills in the result variables, and returns the scan success | |
313 | * in the return code. Callers can specify #NULL for variable references | |
314 | * if they are not interested in specific aspects of the USB address. | |
315 | */ | |
316 | SR_PRIV int sr_usb_split_conn(const char *conn, | |
317 | uint16_t *vid, uint16_t *pid, uint8_t *bus, uint8_t *addr) | |
318 | { | |
319 | gboolean valid; | |
320 | GRegex *reg; | |
321 | GMatchInfo *match; | |
322 | char *mstr; | |
323 | uint32_t num; | |
324 | ||
325 | if (vid) *vid = 0; | |
326 | if (pid) *pid = 0; | |
327 | if (bus) *bus = 0; | |
328 | if (addr) *addr = 0; | |
329 | ||
330 | valid = TRUE; | |
331 | reg = g_regex_new(CONN_USB_VIDPID, 0, 0, NULL); | |
332 | if (g_regex_match(reg, conn, 0, &match)) { | |
333 | /* Found a VID:PID style pattern. */ | |
334 | if ((mstr = g_match_info_fetch(match, 1))) { | |
335 | num = strtoul(mstr, NULL, 16); | |
336 | if (num > 0xffff) | |
337 | valid = FALSE; | |
338 | if (vid) | |
339 | *vid = num & 0xffff; | |
340 | } | |
341 | g_free(mstr); | |
342 | ||
343 | if ((mstr = g_match_info_fetch(match, 2))) { | |
344 | num = strtoul(mstr, NULL, 16); | |
345 | if (num > 0xffff) | |
346 | valid = FALSE; | |
347 | if (pid) | |
348 | *pid = num & 0xffff; | |
349 | } | |
350 | g_free(mstr); | |
351 | } else { | |
352 | g_match_info_unref(match); | |
353 | g_regex_unref(reg); | |
354 | reg = g_regex_new(CONN_USB_BUSADDR, 0, 0, NULL); | |
355 | if (g_regex_match(reg, conn, 0, &match)) { | |
356 | /* Found a bus.address style pattern. */ | |
357 | if ((mstr = g_match_info_fetch(match, 1))) { | |
358 | num = strtoul(mstr, NULL, 10); | |
359 | if (num > 255) | |
360 | valid = FALSE; | |
361 | if (bus) | |
362 | *bus = num & 0xff; | |
363 | } | |
364 | g_free(mstr); | |
365 | ||
366 | if ((mstr = g_match_info_fetch(match, 2))) { | |
367 | num = strtoul(mstr, NULL, 10); | |
368 | if (num > 127) | |
369 | valid = FALSE; | |
370 | if (addr) | |
371 | *addr = num & 0x7f; | |
372 | } | |
373 | g_free(mstr); | |
374 | } | |
375 | } | |
376 | g_match_info_unref(match); | |
377 | g_regex_unref(reg); | |
378 | ||
379 | return valid ? SR_OK : SR_ERR_ARG; | |
380 | } | |
381 | ||
382 | /** | |
383 | * Find USB devices according to a connection string. | |
384 | * | |
385 | * @param usb_ctx libusb context to use while scanning. | |
386 | * @param conn Connection string specifying the device(s) to match. This | |
387 | * can be of the form "<bus>.<address>", or "<vendorid>.<productid>". | |
388 | * | |
389 | * @return A GSList of struct sr_usb_dev_inst, with bus and address fields | |
390 | * matching the device that matched the connection string. The GSList and | |
391 | * its contents must be freed by the caller. | |
392 | */ | |
393 | SR_PRIV GSList *sr_usb_find(libusb_context *usb_ctx, const char *conn) | |
394 | { | |
395 | struct sr_usb_dev_inst *usb; | |
396 | struct libusb_device **devlist; | |
397 | struct libusb_device_descriptor des; | |
398 | GSList *devices; | |
399 | uint16_t vid, pid; | |
400 | uint8_t bus, addr; | |
401 | int b, a, ret, i; | |
402 | ||
403 | ret = sr_usb_split_conn(conn, &vid, &pid, &bus, &addr); | |
404 | if (ret != SR_OK) { | |
405 | sr_err("Invalid input, or neither VID:PID nor bus.address specified."); | |
406 | return NULL; | |
407 | } | |
408 | if (!(vid && pid) && !(bus && addr)) { | |
409 | sr_err("Could neither determine VID:PID nor bus.address numbers."); | |
410 | return NULL; | |
411 | } | |
412 | ||
413 | /* Looks like a valid USB device specification, but is it connected? */ | |
414 | devices = NULL; | |
415 | libusb_get_device_list(usb_ctx, &devlist); | |
416 | for (i = 0; devlist[i]; i++) { | |
417 | if ((ret = libusb_get_device_descriptor(devlist[i], &des))) { | |
418 | sr_err("Failed to get device descriptor: %s.", | |
419 | libusb_error_name(ret)); | |
420 | continue; | |
421 | } | |
422 | ||
423 | if (vid && pid && (des.idVendor != vid || des.idProduct != pid)) | |
424 | continue; | |
425 | ||
426 | b = libusb_get_bus_number(devlist[i]); | |
427 | a = libusb_get_device_address(devlist[i]); | |
428 | if (bus && addr && (b != bus || a != addr)) | |
429 | continue; | |
430 | ||
431 | sr_dbg("Found USB device (VID:PID = %04x:%04x, bus.address = " | |
432 | "%d.%d).", des.idVendor, des.idProduct, b, a); | |
433 | ||
434 | usb = sr_usb_dev_inst_new(b, a, NULL); | |
435 | devices = g_slist_append(devices, usb); | |
436 | } | |
437 | libusb_free_device_list(devlist, 1); | |
438 | ||
439 | /* No log message for #devices found (caller will log that). */ | |
440 | ||
441 | return devices; | |
442 | } | |
443 | ||
444 | SR_PRIV int sr_usb_open(libusb_context *usb_ctx, struct sr_usb_dev_inst *usb) | |
445 | { | |
446 | struct libusb_device **devlist; | |
447 | struct libusb_device_descriptor des; | |
448 | int ret, r, cnt, i, a, b; | |
449 | ||
450 | sr_dbg("Trying to open USB device %d.%d.", usb->bus, usb->address); | |
451 | ||
452 | if ((cnt = libusb_get_device_list(usb_ctx, &devlist)) < 0) { | |
453 | sr_err("Failed to retrieve device list: %s.", | |
454 | libusb_error_name(cnt)); | |
455 | return SR_ERR; | |
456 | } | |
457 | ||
458 | ret = SR_ERR; | |
459 | for (i = 0; i < cnt; i++) { | |
460 | if ((r = libusb_get_device_descriptor(devlist[i], &des)) < 0) { | |
461 | sr_err("Failed to get device descriptor: %s.", | |
462 | libusb_error_name(r)); | |
463 | continue; | |
464 | } | |
465 | ||
466 | b = libusb_get_bus_number(devlist[i]); | |
467 | a = libusb_get_device_address(devlist[i]); | |
468 | if (b != usb->bus || a != usb->address) | |
469 | continue; | |
470 | ||
471 | if ((r = libusb_open(devlist[i], &usb->devhdl)) < 0) { | |
472 | sr_err("Failed to open device: %s.", | |
473 | libusb_error_name(r)); | |
474 | break; | |
475 | } | |
476 | ||
477 | sr_dbg("Opened USB device (VID:PID = %04x:%04x, bus.address = " | |
478 | "%d.%d).", des.idVendor, des.idProduct, b, a); | |
479 | ||
480 | ret = SR_OK; | |
481 | break; | |
482 | } | |
483 | ||
484 | libusb_free_device_list(devlist, 1); | |
485 | ||
486 | return ret; | |
487 | } | |
488 | ||
489 | SR_PRIV void sr_usb_close(struct sr_usb_dev_inst *usb) | |
490 | { | |
491 | libusb_close(usb->devhdl); | |
492 | usb->devhdl = NULL; | |
493 | sr_dbg("Closed USB device %d.%d.", usb->bus, usb->address); | |
494 | } | |
495 | ||
496 | SR_PRIV int usb_source_add(struct sr_session *session, struct sr_context *ctx, | |
497 | int timeout, sr_receive_data_callback cb, void *cb_data) | |
498 | { | |
499 | GSource *source; | |
500 | int ret; | |
501 | ||
502 | source = usb_source_new(session, ctx->libusb_ctx, timeout); | |
503 | if (!source) | |
504 | return SR_ERR; | |
505 | ||
506 | g_source_set_callback(source, G_SOURCE_FUNC(cb), cb_data, NULL); | |
507 | ||
508 | ret = sr_session_source_add_internal(session, ctx->libusb_ctx, source); | |
509 | g_source_unref(source); | |
510 | ||
511 | return ret; | |
512 | } | |
513 | ||
514 | SR_PRIV int usb_source_remove(struct sr_session *session, struct sr_context *ctx) | |
515 | { | |
516 | return sr_session_source_remove_internal(session, ctx->libusb_ctx); | |
517 | } | |
518 | ||
519 | SR_PRIV int usb_get_port_path(libusb_device *dev, char *path, int path_len) | |
520 | { | |
521 | uint8_t port_numbers[8]; | |
522 | int i, n, len; | |
523 | ||
524 | /* | |
525 | * FreeBSD requires that devices prior to calling libusb_get_port_numbers() | |
526 | * have been opened with libusb_open(). | |
527 | * This apparently also applies to some Mac OS X versions. | |
528 | */ | |
529 | #if defined(__FreeBSD__) || defined(__APPLE__) | |
530 | struct libusb_device_handle *devh; | |
531 | if (libusb_open(dev, &devh) != 0) | |
532 | return SR_ERR; | |
533 | #endif | |
534 | n = libusb_get_port_numbers(dev, port_numbers, sizeof(port_numbers)); | |
535 | #if defined(__FreeBSD__) || defined(__APPLE__) | |
536 | libusb_close(devh); | |
537 | #endif | |
538 | ||
539 | /* Workaround FreeBSD / Mac OS X libusb_get_port_numbers() returning 0. */ | |
540 | #if defined(__FreeBSD__) || defined(__APPLE__) | |
541 | if (n == 0) { | |
542 | port_numbers[0] = libusb_get_device_address(dev); | |
543 | n = 1; | |
544 | } | |
545 | #endif | |
546 | if (n < 1) | |
547 | return SR_ERR; | |
548 | ||
549 | len = snprintf(path, path_len, "usb/%d-%d", | |
550 | libusb_get_bus_number(dev), port_numbers[0]); | |
551 | ||
552 | for (i = 1; i < n; i++) | |
553 | len += snprintf(path+len, path_len-len, ".%d", port_numbers[i]); | |
554 | ||
555 | return SR_OK; | |
556 | } | |
557 | ||
558 | /** | |
559 | * Check the USB configuration to determine if this device has a given | |
560 | * manufacturer and product string. | |
561 | * | |
562 | * @return TRUE if the device's configuration profile strings | |
563 | * configuration, FALSE otherwise. | |
564 | */ | |
565 | SR_PRIV gboolean usb_match_manuf_prod(libusb_device *dev, | |
566 | const char *manufacturer, const char *product) | |
567 | { | |
568 | struct libusb_device_descriptor des; | |
569 | struct libusb_device_handle *hdl; | |
570 | gboolean ret; | |
571 | unsigned char strdesc[64]; | |
572 | ||
573 | hdl = NULL; | |
574 | ret = FALSE; | |
575 | while (!ret) { | |
576 | /* Assume the FW has not been loaded, unless proven wrong. */ | |
577 | libusb_get_device_descriptor(dev, &des); | |
578 | ||
579 | if (libusb_open(dev, &hdl) != 0) | |
580 | break; | |
581 | ||
582 | if (libusb_get_string_descriptor_ascii(hdl, | |
583 | des.iManufacturer, strdesc, sizeof(strdesc)) < 0) | |
584 | break; | |
585 | if (strcmp((const char *)strdesc, manufacturer)) | |
586 | break; | |
587 | ||
588 | if (libusb_get_string_descriptor_ascii(hdl, | |
589 | des.iProduct, strdesc, sizeof(strdesc)) < 0) | |
590 | break; | |
591 | if (strcmp((const char *)strdesc, product)) | |
592 | break; | |
593 | ||
594 | ret = TRUE; | |
595 | } | |
596 | if (hdl) | |
597 | libusb_close(hdl); | |
598 | ||
599 | return ret; | |
600 | } |