1 /* $FreeBSD: head/lib/libusb/libusb20.c 253339 2013-07-14 10:22:00Z hselasky $ */
2 /*-
3 * Copyright (c) 2008-2009 Hans Petter Selasky. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27 #ifdef LIBUSB_GLOBAL_INCLUDE_FILE
28 #include LIBUSB_GLOBAL_INCLUDE_FILE
29 #else
30 #include <ctype.h>
31 #include <poll.h>
32 #include <stdio.h>
33 #include <stdlib.h>
34 #include <string.h>
35 #include <time.h>
36 #include <sys/queue.h>
37 #endif
38
39 #include "libusb20.h"
40 #include "libusb20_desc.h"
41 #include "libusb20_int.h"
42
43 static int
dummy_int(void)44 dummy_int(void)
45 {
46 return (LIBUSB20_ERROR_NOT_SUPPORTED);
47 }
48
49 static void
dummy_void(void)50 dummy_void(void)
51 {
52 return;
53 }
54
55 static void
dummy_callback(struct libusb20_transfer * xfer)56 dummy_callback(struct libusb20_transfer *xfer)
57 {
58 ; /* style fix */
59 switch (libusb20_tr_get_status(xfer)) {
60 case LIBUSB20_TRANSFER_START:
61 libusb20_tr_submit(xfer);
62 break;
63 default:
64 /* complete or error */
65 break;
66 }
67 return;
68 }
69
70 #define dummy_get_config_desc_full (void *)dummy_int
71 #define dummy_get_config_index (void *)dummy_int
72 #define dummy_set_config_index (void *)dummy_int
73 #define dummy_set_alt_index (void *)dummy_int
74 #define dummy_reset_device (void *)dummy_int
75 #define dummy_check_connected (void *)dummy_int
76 #define dummy_set_power_mode (void *)dummy_int
77 #define dummy_get_power_mode (void *)dummy_int
78 #define dummy_get_port_path (void *)dummy_int
79 #define dummy_get_power_usage (void *)dummy_int
80 #define dummy_kernel_driver_active (void *)dummy_int
81 #define dummy_detach_kernel_driver (void *)dummy_int
82 #define dummy_do_request_sync (void *)dummy_int
83 #define dummy_tr_open (void *)dummy_int
84 #define dummy_tr_close (void *)dummy_int
85 #define dummy_tr_clear_stall_sync (void *)dummy_int
86 #define dummy_process (void *)dummy_int
87 #define dummy_dev_info (void *)dummy_int
88 #define dummy_dev_get_iface_driver (void *)dummy_int
89
90 #define dummy_tr_submit (void *)dummy_void
91 #define dummy_tr_cancel_async (void *)dummy_void
92
93 static const struct libusb20_device_methods libusb20_dummy_methods = {
94 LIBUSB20_DEVICE(LIBUSB20_DECLARE, dummy)
95 };
96
97 void
libusb20_tr_callback_wrapper(struct libusb20_transfer * xfer)98 libusb20_tr_callback_wrapper(struct libusb20_transfer *xfer)
99 {
100 ; /* style fix */
101
102 repeat:
103
104 if (!xfer->is_pending) {
105 xfer->status = LIBUSB20_TRANSFER_START;
106 } else {
107 xfer->is_pending = 0;
108 }
109
110 xfer->callback(xfer);
111
112 if (xfer->is_restart) {
113 xfer->is_restart = 0;
114 goto repeat;
115 }
116 if (xfer->is_draining &&
117 (!xfer->is_pending)) {
118 xfer->is_draining = 0;
119 xfer->status = LIBUSB20_TRANSFER_DRAINED;
120 xfer->callback(xfer);
121 }
122 return;
123 }
124
125 int
libusb20_tr_close(struct libusb20_transfer * xfer)126 libusb20_tr_close(struct libusb20_transfer *xfer)
127 {
128 int error;
129
130 if (!xfer->is_opened) {
131 return (LIBUSB20_ERROR_OTHER);
132 }
133 error = xfer->pdev->methods->tr_close(xfer);
134
135 if (xfer->pLength) {
136 free(xfer->pLength);
137 }
138 if (xfer->ppBuffer) {
139 free(xfer->ppBuffer);
140 }
141 /* reset variable fields in case the transfer is opened again */
142 xfer->priv_sc0 = 0;
143 xfer->priv_sc1 = 0;
144 xfer->is_opened = 0;
145 xfer->is_pending = 0;
146 xfer->is_cancel = 0;
147 xfer->is_draining = 0;
148 xfer->is_restart = 0;
149 xfer->status = 0;
150 xfer->flags = 0;
151 xfer->nFrames = 0;
152 xfer->aFrames = 0;
153 xfer->timeout = 0;
154 xfer->maxFrames = 0;
155 xfer->maxTotalLength = 0;
156 xfer->maxPacketLen = 0;
157 return (error);
158 }
159
160 int
libusb20_tr_open(struct libusb20_transfer * xfer,uint32_t MaxBufSize,uint32_t MaxFrameCount,uint8_t ep_no)161 libusb20_tr_open(struct libusb20_transfer *xfer, uint32_t MaxBufSize,
162 uint32_t MaxFrameCount, uint8_t ep_no)
163 {
164 return (libusb20_tr_open_stream(xfer, MaxBufSize, MaxFrameCount, ep_no, 0));
165 }
166
167 int
libusb20_tr_open_stream(struct libusb20_transfer * xfer,uint32_t MaxBufSize,uint32_t MaxFrameCount,uint8_t ep_no,uint16_t stream_id)168 libusb20_tr_open_stream(struct libusb20_transfer *xfer, uint32_t MaxBufSize,
169 uint32_t MaxFrameCount, uint8_t ep_no, uint16_t stream_id)
170 {
171 uint32_t size;
172 uint8_t pre_scale;
173 int error;
174
175 if (xfer->is_opened)
176 return (LIBUSB20_ERROR_BUSY);
177 if (MaxFrameCount & LIBUSB20_MAX_FRAME_PRE_SCALE) {
178 MaxFrameCount &= ~LIBUSB20_MAX_FRAME_PRE_SCALE;
179 pre_scale = 1;
180 } else {
181 pre_scale = 0;
182 }
183 if (MaxFrameCount == 0)
184 return (LIBUSB20_ERROR_INVALID_PARAM);
185
186 xfer->maxFrames = MaxFrameCount;
187
188 size = MaxFrameCount * sizeof(xfer->pLength[0]);
189 xfer->pLength = malloc(size);
190 if (xfer->pLength == NULL) {
191 return (LIBUSB20_ERROR_NO_MEM);
192 }
193 memset(xfer->pLength, 0, size);
194
195 size = MaxFrameCount * sizeof(xfer->ppBuffer[0]);
196 xfer->ppBuffer = malloc(size);
197 if (xfer->ppBuffer == NULL) {
198 free(xfer->pLength);
199 return (LIBUSB20_ERROR_NO_MEM);
200 }
201 memset(xfer->ppBuffer, 0, size);
202
203 error = xfer->pdev->methods->tr_open(xfer, MaxBufSize,
204 MaxFrameCount, ep_no, stream_id, pre_scale);
205
206 if (error) {
207 free(xfer->ppBuffer);
208 free(xfer->pLength);
209 } else {
210 xfer->is_opened = 1;
211 }
212 return (error);
213 }
214
215 struct libusb20_transfer *
libusb20_tr_get_pointer(struct libusb20_device * pdev,uint16_t trIndex)216 libusb20_tr_get_pointer(struct libusb20_device *pdev, uint16_t trIndex)
217 {
218 if (trIndex >= pdev->nTransfer) {
219 return (NULL);
220 }
221 return (pdev->pTransfer + trIndex);
222 }
223
224 uint32_t
libusb20_tr_get_actual_frames(struct libusb20_transfer * xfer)225 libusb20_tr_get_actual_frames(struct libusb20_transfer *xfer)
226 {
227 return (xfer->aFrames);
228 }
229
230 uint16_t
libusb20_tr_get_time_complete(struct libusb20_transfer * xfer)231 libusb20_tr_get_time_complete(struct libusb20_transfer *xfer)
232 {
233 return (xfer->timeComplete);
234 }
235
236 uint32_t
libusb20_tr_get_actual_length(struct libusb20_transfer * xfer)237 libusb20_tr_get_actual_length(struct libusb20_transfer *xfer)
238 {
239 uint32_t x;
240 uint32_t actlen = 0;
241
242 for (x = 0; x != xfer->aFrames; x++) {
243 actlen += xfer->pLength[x];
244 }
245 return (actlen);
246 }
247
248 uint32_t
libusb20_tr_get_max_frames(struct libusb20_transfer * xfer)249 libusb20_tr_get_max_frames(struct libusb20_transfer *xfer)
250 {
251 return (xfer->maxFrames);
252 }
253
254 uint32_t
libusb20_tr_get_max_packet_length(struct libusb20_transfer * xfer)255 libusb20_tr_get_max_packet_length(struct libusb20_transfer *xfer)
256 {
257 /*
258 * Special Case NOTE: If the packet multiplier is non-zero for
259 * High Speed USB, the value returned is equal to
260 * "wMaxPacketSize * multiplier" !
261 */
262 return (xfer->maxPacketLen);
263 }
264
265 uint32_t
libusb20_tr_get_max_total_length(struct libusb20_transfer * xfer)266 libusb20_tr_get_max_total_length(struct libusb20_transfer *xfer)
267 {
268 return (xfer->maxTotalLength);
269 }
270
271 uint8_t
libusb20_tr_get_status(struct libusb20_transfer * xfer)272 libusb20_tr_get_status(struct libusb20_transfer *xfer)
273 {
274 return (xfer->status);
275 }
276
277 uint8_t
libusb20_tr_pending(struct libusb20_transfer * xfer)278 libusb20_tr_pending(struct libusb20_transfer *xfer)
279 {
280 return (xfer->is_pending);
281 }
282
283 void *
libusb20_tr_get_priv_sc0(struct libusb20_transfer * xfer)284 libusb20_tr_get_priv_sc0(struct libusb20_transfer *xfer)
285 {
286 return (xfer->priv_sc0);
287 }
288
289 void *
libusb20_tr_get_priv_sc1(struct libusb20_transfer * xfer)290 libusb20_tr_get_priv_sc1(struct libusb20_transfer *xfer)
291 {
292 return (xfer->priv_sc1);
293 }
294
295 void
libusb20_tr_stop(struct libusb20_transfer * xfer)296 libusb20_tr_stop(struct libusb20_transfer *xfer)
297 {
298 if (!xfer->is_opened) {
299 /* transfer is not opened */
300 return;
301 }
302 if (!xfer->is_pending) {
303 /* transfer not pending */
304 return;
305 }
306 if (xfer->is_cancel) {
307 /* already cancelling */
308 return;
309 }
310 xfer->is_cancel = 1; /* we are cancelling */
311
312 xfer->pdev->methods->tr_cancel_async(xfer);
313 return;
314 }
315
316 void
libusb20_tr_drain(struct libusb20_transfer * xfer)317 libusb20_tr_drain(struct libusb20_transfer *xfer)
318 {
319 if (!xfer->is_opened) {
320 /* transfer is not opened */
321 return;
322 }
323 /* make sure that we are cancelling */
324 libusb20_tr_stop(xfer);
325
326 if (xfer->is_pending) {
327 xfer->is_draining = 1;
328 }
329 return;
330 }
331
332 void
libusb20_tr_clear_stall_sync(struct libusb20_transfer * xfer)333 libusb20_tr_clear_stall_sync(struct libusb20_transfer *xfer)
334 {
335 xfer->pdev->methods->tr_clear_stall_sync(xfer);
336 return;
337 }
338
339 void
libusb20_tr_set_buffer(struct libusb20_transfer * xfer,void * buffer,uint16_t frIndex)340 libusb20_tr_set_buffer(struct libusb20_transfer *xfer, void *buffer, uint16_t frIndex)
341 {
342 xfer->ppBuffer[frIndex] = libusb20_pass_ptr(buffer);
343 return;
344 }
345
346 void
libusb20_tr_set_callback(struct libusb20_transfer * xfer,libusb20_tr_callback_t * cb)347 libusb20_tr_set_callback(struct libusb20_transfer *xfer, libusb20_tr_callback_t *cb)
348 {
349 xfer->callback = cb;
350 return;
351 }
352
353 void
libusb20_tr_set_flags(struct libusb20_transfer * xfer,uint8_t flags)354 libusb20_tr_set_flags(struct libusb20_transfer *xfer, uint8_t flags)
355 {
356 xfer->flags = flags;
357 return;
358 }
359
360 uint32_t
libusb20_tr_get_length(struct libusb20_transfer * xfer,uint16_t frIndex)361 libusb20_tr_get_length(struct libusb20_transfer *xfer, uint16_t frIndex)
362 {
363 return (xfer->pLength[frIndex]);
364 }
365
366 void
libusb20_tr_set_length(struct libusb20_transfer * xfer,uint32_t length,uint16_t frIndex)367 libusb20_tr_set_length(struct libusb20_transfer *xfer, uint32_t length, uint16_t frIndex)
368 {
369 xfer->pLength[frIndex] = length;
370 return;
371 }
372
373 void
libusb20_tr_set_priv_sc0(struct libusb20_transfer * xfer,void * sc0)374 libusb20_tr_set_priv_sc0(struct libusb20_transfer *xfer, void *sc0)
375 {
376 xfer->priv_sc0 = sc0;
377 return;
378 }
379
380 void
libusb20_tr_set_priv_sc1(struct libusb20_transfer * xfer,void * sc1)381 libusb20_tr_set_priv_sc1(struct libusb20_transfer *xfer, void *sc1)
382 {
383 xfer->priv_sc1 = sc1;
384 return;
385 }
386
387 void
libusb20_tr_set_timeout(struct libusb20_transfer * xfer,uint32_t timeout)388 libusb20_tr_set_timeout(struct libusb20_transfer *xfer, uint32_t timeout)
389 {
390 xfer->timeout = timeout;
391 return;
392 }
393
394 void
libusb20_tr_set_total_frames(struct libusb20_transfer * xfer,uint32_t nFrames)395 libusb20_tr_set_total_frames(struct libusb20_transfer *xfer, uint32_t nFrames)
396 {
397 if (nFrames > xfer->maxFrames) {
398 /* should not happen */
399 nFrames = xfer->maxFrames;
400 }
401 xfer->nFrames = nFrames;
402 return;
403 }
404
405 void
libusb20_tr_setup_bulk(struct libusb20_transfer * xfer,void * pBuf,uint32_t length,uint32_t timeout)406 libusb20_tr_setup_bulk(struct libusb20_transfer *xfer, void *pBuf, uint32_t length, uint32_t timeout)
407 {
408 xfer->ppBuffer[0] = libusb20_pass_ptr(pBuf);
409 xfer->pLength[0] = length;
410 xfer->timeout = timeout;
411 xfer->nFrames = 1;
412 return;
413 }
414
415 void
libusb20_tr_setup_control(struct libusb20_transfer * xfer,void * psetup,void * pBuf,uint32_t timeout)416 libusb20_tr_setup_control(struct libusb20_transfer *xfer, void *psetup, void *pBuf, uint32_t timeout)
417 {
418 uint16_t len;
419
420 xfer->ppBuffer[0] = libusb20_pass_ptr(psetup);
421 xfer->pLength[0] = 8; /* fixed */
422 xfer->timeout = timeout;
423
424 len = ((uint8_t *)psetup)[6] | (((uint8_t *)psetup)[7] << 8);
425
426 if (len != 0) {
427 xfer->nFrames = 2;
428 xfer->ppBuffer[1] = libusb20_pass_ptr(pBuf);
429 xfer->pLength[1] = len;
430 } else {
431 xfer->nFrames = 1;
432 }
433 return;
434 }
435
436 void
libusb20_tr_setup_intr(struct libusb20_transfer * xfer,void * pBuf,uint32_t length,uint32_t timeout)437 libusb20_tr_setup_intr(struct libusb20_transfer *xfer, void *pBuf, uint32_t length, uint32_t timeout)
438 {
439 xfer->ppBuffer[0] = libusb20_pass_ptr(pBuf);
440 xfer->pLength[0] = length;
441 xfer->timeout = timeout;
442 xfer->nFrames = 1;
443 return;
444 }
445
446 void
libusb20_tr_setup_isoc(struct libusb20_transfer * xfer,void * pBuf,uint32_t length,uint16_t frIndex)447 libusb20_tr_setup_isoc(struct libusb20_transfer *xfer, void *pBuf, uint32_t length, uint16_t frIndex)
448 {
449 if (frIndex >= xfer->maxFrames) {
450 /* should not happen */
451 return;
452 }
453 xfer->ppBuffer[frIndex] = libusb20_pass_ptr(pBuf);
454 xfer->pLength[frIndex] = length;
455 return;
456 }
457
458 uint8_t
libusb20_tr_bulk_intr_sync(struct libusb20_transfer * xfer,void * pbuf,uint32_t length,uint32_t * pactlen,uint32_t timeout)459 libusb20_tr_bulk_intr_sync(struct libusb20_transfer *xfer,
460 void *pbuf, uint32_t length, uint32_t *pactlen,
461 uint32_t timeout)
462 {
463 struct libusb20_device *pdev = xfer->pdev;
464 uint32_t transfer_max;
465 uint32_t transfer_act;
466 uint8_t retval;
467
468 /* set some sensible default value */
469 if (pactlen != NULL)
470 *pactlen = 0;
471
472 /* check for error condition */
473 if (libusb20_tr_pending(xfer))
474 return (LIBUSB20_ERROR_OTHER);
475
476 do {
477 /* compute maximum transfer length */
478 transfer_max =
479 libusb20_tr_get_max_total_length(xfer);
480
481 if (transfer_max > length)
482 transfer_max = length;
483
484 /* setup bulk or interrupt transfer */
485 libusb20_tr_setup_bulk(xfer, pbuf,
486 transfer_max, timeout);
487
488 /* start the transfer */
489 libusb20_tr_start(xfer);
490
491 /* wait for transfer completion */
492 while (libusb20_dev_process(pdev) == 0) {
493
494 if (libusb20_tr_pending(xfer) == 0)
495 break;
496
497 libusb20_dev_wait_process(pdev, -1);
498 }
499
500 transfer_act = libusb20_tr_get_actual_length(xfer);
501
502 /* update actual length, if any */
503 if (pactlen != NULL)
504 pactlen[0] += transfer_act;
505
506 /* check transfer status */
507 retval = libusb20_tr_get_status(xfer);
508 if (retval)
509 break;
510
511 /* check for short transfer */
512 if (transfer_act != transfer_max)
513 break;
514
515 /* update buffer pointer and length */
516 pbuf = ((uint8_t *)pbuf) + transfer_max;
517 length = length - transfer_max;
518
519 } while (length != 0);
520
521 return (retval);
522 }
523
524 void
libusb20_tr_submit(struct libusb20_transfer * xfer)525 libusb20_tr_submit(struct libusb20_transfer *xfer)
526 {
527 if (!xfer->is_opened) {
528 /* transfer is not opened */
529 return;
530 }
531 if (xfer->is_pending) {
532 /* should not happen */
533 return;
534 }
535 xfer->is_pending = 1; /* we are pending */
536 xfer->is_cancel = 0; /* not cancelling */
537 xfer->is_restart = 0; /* not restarting */
538
539 xfer->pdev->methods->tr_submit(xfer);
540 return;
541 }
542
543 void
libusb20_tr_start(struct libusb20_transfer * xfer)544 libusb20_tr_start(struct libusb20_transfer *xfer)
545 {
546 if (!xfer->is_opened) {
547 /* transfer is not opened */
548 return;
549 }
550 if (xfer->is_pending) {
551 if (xfer->is_cancel) {
552 /* cancelling - restart */
553 xfer->is_restart = 1;
554 }
555 /* transfer not pending */
556 return;
557 }
558 /* get into the callback */
559 libusb20_tr_callback_wrapper(xfer);
560 return;
561 }
562
563 /* USB device operations */
564
565 int
libusb20_dev_close(struct libusb20_device * pdev)566 libusb20_dev_close(struct libusb20_device *pdev)
567 {
568 struct libusb20_transfer *xfer;
569 uint16_t x;
570 int error = 0;
571
572 if (!pdev->is_opened) {
573 return (LIBUSB20_ERROR_OTHER);
574 }
575 for (x = 0; x != pdev->nTransfer; x++) {
576 xfer = pdev->pTransfer + x;
577
578 if (!xfer->is_opened) {
579 /* transfer is not opened */
580 continue;
581 }
582
583 libusb20_tr_drain(xfer);
584
585 libusb20_tr_close(xfer);
586 }
587
588 if (pdev->pTransfer != NULL) {
589 free(pdev->pTransfer);
590 pdev->pTransfer = NULL;
591 }
592 error = pdev->beMethods->close_device(pdev);
593
594 pdev->methods = &libusb20_dummy_methods;
595
596 pdev->is_opened = 0;
597
598 /*
599 * The following variable is only used by the libusb v0.1
600 * compat layer:
601 */
602 pdev->claimed_interface = 0;
603
604 return (error);
605 }
606
607 int
libusb20_dev_detach_kernel_driver(struct libusb20_device * pdev,uint8_t ifaceIndex)608 libusb20_dev_detach_kernel_driver(struct libusb20_device *pdev, uint8_t ifaceIndex)
609 {
610 int error;
611
612 error = pdev->methods->detach_kernel_driver(pdev, ifaceIndex);
613 return (error);
614 }
615
616 struct LIBUSB20_DEVICE_DESC_DECODED *
libusb20_dev_get_device_desc(struct libusb20_device * pdev)617 libusb20_dev_get_device_desc(struct libusb20_device *pdev)
618 {
619 return (&(pdev->ddesc));
620 }
621
622 int
libusb20_dev_get_fd(struct libusb20_device * pdev)623 libusb20_dev_get_fd(struct libusb20_device *pdev)
624 {
625 return (pdev->file);
626 }
627
628 int
libusb20_dev_kernel_driver_active(struct libusb20_device * pdev,uint8_t ifaceIndex)629 libusb20_dev_kernel_driver_active(struct libusb20_device *pdev, uint8_t ifaceIndex)
630 {
631 int error;
632
633 error = pdev->methods->kernel_driver_active(pdev, ifaceIndex);
634 return (error);
635 }
636
637 int
libusb20_dev_open(struct libusb20_device * pdev,uint16_t nTransferMax)638 libusb20_dev_open(struct libusb20_device *pdev, uint16_t nTransferMax)
639 {
640 struct libusb20_transfer *xfer;
641 uint32_t size;
642 uint16_t x;
643 int error;
644
645 if (pdev->is_opened) {
646 return (LIBUSB20_ERROR_BUSY);
647 }
648 if (nTransferMax >= 256) {
649 return (LIBUSB20_ERROR_INVALID_PARAM);
650 } else if (nTransferMax != 0) {
651 size = sizeof(pdev->pTransfer[0]) * nTransferMax;
652 pdev->pTransfer = malloc(size);
653 if (pdev->pTransfer == NULL) {
654 return (LIBUSB20_ERROR_NO_MEM);
655 }
656 memset(pdev->pTransfer, 0, size);
657 }
658 /* initialise all transfers */
659 for (x = 0; x != nTransferMax; x++) {
660
661 xfer = pdev->pTransfer + x;
662
663 xfer->pdev = pdev;
664 xfer->trIndex = x;
665 xfer->callback = &dummy_callback;
666 }
667
668 /* set "nTransfer" early */
669 pdev->nTransfer = nTransferMax;
670
671 error = pdev->beMethods->open_device(pdev, nTransferMax);
672
673 if (error) {
674 if (pdev->pTransfer != NULL) {
675 free(pdev->pTransfer);
676 pdev->pTransfer = NULL;
677 }
678 pdev->file = -1;
679 pdev->file_ctrl = -1;
680 pdev->nTransfer = 0;
681 } else {
682 pdev->is_opened = 1;
683 }
684 return (error);
685 }
686
687 int
libusb20_dev_reset(struct libusb20_device * pdev)688 libusb20_dev_reset(struct libusb20_device *pdev)
689 {
690 int error;
691
692 error = pdev->methods->reset_device(pdev);
693 return (error);
694 }
695
696 int
libusb20_dev_check_connected(struct libusb20_device * pdev)697 libusb20_dev_check_connected(struct libusb20_device *pdev)
698 {
699 int error;
700
701 error = pdev->methods->check_connected(pdev);
702 return (error);
703 }
704
705 int
libusb20_dev_set_power_mode(struct libusb20_device * pdev,uint8_t power_mode)706 libusb20_dev_set_power_mode(struct libusb20_device *pdev, uint8_t power_mode)
707 {
708 int error;
709
710 error = pdev->methods->set_power_mode(pdev, power_mode);
711 return (error);
712 }
713
714 uint8_t
libusb20_dev_get_power_mode(struct libusb20_device * pdev)715 libusb20_dev_get_power_mode(struct libusb20_device *pdev)
716 {
717 int error;
718 uint8_t power_mode;
719
720 error = pdev->methods->get_power_mode(pdev, &power_mode);
721 if (error)
722 power_mode = LIBUSB20_POWER_ON; /* fake power mode */
723 return (power_mode);
724 }
725
726 int
libusb20_dev_get_port_path(struct libusb20_device * pdev,uint8_t * buf,uint8_t bufsize)727 libusb20_dev_get_port_path(struct libusb20_device *pdev, uint8_t *buf, uint8_t bufsize)
728 {
729 return (pdev->methods->get_port_path(pdev, buf, bufsize));
730 }
731
732 uint16_t
libusb20_dev_get_power_usage(struct libusb20_device * pdev)733 libusb20_dev_get_power_usage(struct libusb20_device *pdev)
734 {
735 int error;
736 uint16_t power_usage;
737
738 error = pdev->methods->get_power_usage(pdev, &power_usage);
739 if (error)
740 power_usage = 0;
741 return (power_usage);
742 }
743
744 int
libusb20_dev_set_alt_index(struct libusb20_device * pdev,uint8_t ifaceIndex,uint8_t altIndex)745 libusb20_dev_set_alt_index(struct libusb20_device *pdev, uint8_t ifaceIndex, uint8_t altIndex)
746 {
747 int error;
748
749 error = pdev->methods->set_alt_index(pdev, ifaceIndex, altIndex);
750 return (error);
751 }
752
753 int
libusb20_dev_set_config_index(struct libusb20_device * pdev,uint8_t configIndex)754 libusb20_dev_set_config_index(struct libusb20_device *pdev, uint8_t configIndex)
755 {
756 int error;
757
758 error = pdev->methods->set_config_index(pdev, configIndex);
759 return (error);
760 }
761
762 int
libusb20_dev_request_sync(struct libusb20_device * pdev,struct LIBUSB20_CONTROL_SETUP_DECODED * setup,void * data,uint16_t * pactlen,uint32_t timeout,uint8_t flags)763 libusb20_dev_request_sync(struct libusb20_device *pdev,
764 struct LIBUSB20_CONTROL_SETUP_DECODED *setup, void *data,
765 uint16_t *pactlen, uint32_t timeout, uint8_t flags)
766 {
767 int error;
768
769 error = pdev->methods->do_request_sync(pdev,
770 setup, data, pactlen, timeout, flags);
771 return (error);
772 }
773
774 int
libusb20_dev_req_string_sync(struct libusb20_device * pdev,uint8_t str_index,uint16_t langid,void * ptr,uint16_t len)775 libusb20_dev_req_string_sync(struct libusb20_device *pdev,
776 uint8_t str_index, uint16_t langid, void *ptr, uint16_t len)
777 {
778 struct LIBUSB20_CONTROL_SETUP_DECODED req;
779 int error;
780
781 /* make sure memory is initialised */
782 memset(ptr, 0, len);
783
784 if (len < 4) {
785 /* invalid length */
786 return (LIBUSB20_ERROR_INVALID_PARAM);
787 }
788 LIBUSB20_INIT(LIBUSB20_CONTROL_SETUP, &req);
789
790 /*
791 * We need to read the USB string in two steps else some USB
792 * devices will complain.
793 */
794 req.bmRequestType =
795 LIBUSB20_REQUEST_TYPE_STANDARD |
796 LIBUSB20_RECIPIENT_DEVICE |
797 LIBUSB20_ENDPOINT_IN;
798 req.bRequest = LIBUSB20_REQUEST_GET_DESCRIPTOR;
799 req.wValue = (LIBUSB20_DT_STRING << 8) | str_index;
800 req.wIndex = langid;
801 req.wLength = 4; /* bytes */
802
803 error = libusb20_dev_request_sync(pdev, &req,
804 ptr, NULL, 1000, LIBUSB20_TRANSFER_SINGLE_SHORT_NOT_OK);
805 if (error) {
806 return (error);
807 }
808 req.wLength = *(uint8_t *)ptr; /* bytes */
809 if (req.wLength > len) {
810 /* partial string read */
811 req.wLength = len;
812 }
813 error = libusb20_dev_request_sync(pdev, &req,
814 ptr, NULL, 1000, LIBUSB20_TRANSFER_SINGLE_SHORT_NOT_OK);
815
816 if (error) {
817 return (error);
818 }
819 if (((uint8_t *)ptr)[1] != LIBUSB20_DT_STRING) {
820 return (LIBUSB20_ERROR_OTHER);
821 }
822 return (0); /* success */
823 }
824
825 int
libusb20_dev_req_string_simple_sync(struct libusb20_device * pdev,uint8_t str_index,void * ptr,uint16_t len)826 libusb20_dev_req_string_simple_sync(struct libusb20_device *pdev,
827 uint8_t str_index, void *ptr, uint16_t len)
828 {
829 char *buf;
830 int error;
831 uint16_t langid;
832 uint16_t n;
833 uint16_t i;
834 uint16_t c;
835 uint8_t temp[255];
836 uint8_t swap;
837
838 /* the following code derives from the FreeBSD USB kernel */
839
840 if ((len < 1) || (ptr == NULL)) {
841 /* too short buffer */
842 return (LIBUSB20_ERROR_INVALID_PARAM);
843 }
844 error = libusb20_dev_req_string_sync(pdev,
845 0, 0, temp, sizeof(temp));
846 if (error < 0) {
847 *(uint8_t *)ptr = 0; /* zero terminate */
848 return (error);
849 }
850 langid = temp[2] | (temp[3] << 8);
851
852 error = libusb20_dev_req_string_sync(pdev, str_index,
853 langid, temp, sizeof(temp));
854 if (error < 0) {
855 *(uint8_t *)ptr = 0; /* zero terminate */
856 return (error);
857 }
858 if (temp[0] < 2) {
859 /* string length is too short */
860 *(uint8_t *)ptr = 0; /* zero terminate */
861 return (LIBUSB20_ERROR_OTHER);
862 }
863 /* reserve one byte for terminating zero */
864 len--;
865
866 /* find maximum length */
867 n = (temp[0] / 2) - 1;
868 if (n > len) {
869 n = len;
870 }
871 /* reset swap state */
872 swap = 3;
873
874 /* setup output buffer pointer */
875 buf = ptr;
876
877 /* convert and filter */
878 for (i = 0; (i != n); i++) {
879 c = temp[(2 * i) + 2] | (temp[(2 * i) + 3] << 8);
880
881 /* convert from Unicode, handle buggy strings */
882 if (((c & 0xff00) == 0) && (swap & 1)) {
883 /* Little Endian, default */
884 *buf = c;
885 swap = 1;
886 } else if (((c & 0x00ff) == 0) && (swap & 2)) {
887 /* Big Endian */
888 *buf = c >> 8;
889 swap = 2;
890 } else {
891 /* skip invalid character */
892 continue;
893 }
894 /*
895 * Filter by default - we don't allow greater and less than
896 * signs because they might confuse the dmesg printouts!
897 */
898 if ((*buf == '<') || (*buf == '>') || (!isprint(*buf))) {
899 /* skip invalid character */
900 continue;
901 }
902 buf++;
903 }
904 *buf = 0; /* zero terminate string */
905
906 return (0);
907 }
908
909 struct libusb20_config *
libusb20_dev_alloc_config(struct libusb20_device * pdev,uint8_t configIndex)910 libusb20_dev_alloc_config(struct libusb20_device *pdev, uint8_t configIndex)
911 {
912 struct libusb20_config *retval = NULL;
913 uint8_t *ptr;
914 uint16_t len;
915 uint8_t do_close;
916 int error;
917
918 if (!pdev->is_opened) {
919 error = libusb20_dev_open(pdev, 0);
920 if (error) {
921 return (NULL);
922 }
923 do_close = 1;
924 } else {
925 do_close = 0;
926 }
927 error = pdev->methods->get_config_desc_full(pdev,
928 &ptr, &len, configIndex);
929
930 if (error) {
931 goto done;
932 }
933 /* parse new config descriptor */
934 retval = libusb20_parse_config_desc(ptr);
935
936 /* free config descriptor */
937 free(ptr);
938
939 done:
940 if (do_close) {
941 error = libusb20_dev_close(pdev);
942 }
943 return (retval);
944 }
945
946 struct libusb20_device *
libusb20_dev_alloc(void)947 libusb20_dev_alloc(void)
948 {
949 struct libusb20_device *pdev;
950
951 pdev = malloc(sizeof(*pdev));
952 if (pdev == NULL) {
953 return (NULL);
954 }
955 memset(pdev, 0, sizeof(*pdev));
956
957 pdev->file = -1;
958 pdev->file_ctrl = -1;
959 pdev->methods = &libusb20_dummy_methods;
960 return (pdev);
961 }
962
963 uint8_t
libusb20_dev_get_config_index(struct libusb20_device * pdev)964 libusb20_dev_get_config_index(struct libusb20_device *pdev)
965 {
966 int error;
967 uint8_t cfg_index;
968 uint8_t do_close;
969
970 if (!pdev->is_opened) {
971 error = libusb20_dev_open(pdev, 0);
972 if (error == 0) {
973 do_close = 1;
974 } else {
975 do_close = 0;
976 }
977 } else {
978 do_close = 0;
979 }
980
981 error = pdev->methods->get_config_index(pdev, &cfg_index);
982 if (error)
983 cfg_index = 0xFF; /* current config index */
984 if (do_close) {
985 if (libusb20_dev_close(pdev)) {
986 /* ignore */
987 }
988 }
989 return (cfg_index);
990 }
991
992 uint8_t
libusb20_dev_get_mode(struct libusb20_device * pdev)993 libusb20_dev_get_mode(struct libusb20_device *pdev)
994 {
995 return (pdev->usb_mode);
996 }
997
998 uint8_t
libusb20_dev_get_speed(struct libusb20_device * pdev)999 libusb20_dev_get_speed(struct libusb20_device *pdev)
1000 {
1001 return (pdev->usb_speed);
1002 }
1003
1004 /* if this function returns an error, the device is gone */
1005 int
libusb20_dev_process(struct libusb20_device * pdev)1006 libusb20_dev_process(struct libusb20_device *pdev)
1007 {
1008 int error;
1009
1010 error = pdev->methods->process(pdev);
1011 return (error);
1012 }
1013
1014 void
libusb20_dev_wait_process(struct libusb20_device * pdev,int timeout)1015 libusb20_dev_wait_process(struct libusb20_device *pdev, int timeout)
1016 {
1017 struct pollfd pfd[1];
1018
1019 if (!pdev->is_opened) {
1020 return;
1021 }
1022 pfd[0].fd = pdev->file;
1023 pfd[0].events = (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM);
1024 pfd[0].revents = 0;
1025
1026 if (poll(pfd, 1, timeout)) {
1027 /* ignore any error */
1028 }
1029 return;
1030 }
1031
1032 void
libusb20_dev_free(struct libusb20_device * pdev)1033 libusb20_dev_free(struct libusb20_device *pdev)
1034 {
1035 if (pdev == NULL) {
1036 /* be NULL safe */
1037 return;
1038 }
1039 if (pdev->is_opened) {
1040 if (libusb20_dev_close(pdev)) {
1041 /* ignore any errors */
1042 }
1043 }
1044 free(pdev);
1045 return;
1046 }
1047
1048 int
libusb20_dev_get_info(struct libusb20_device * pdev,struct usb_device_info * pinfo)1049 libusb20_dev_get_info(struct libusb20_device *pdev,
1050 struct usb_device_info *pinfo)
1051 {
1052 if (pinfo == NULL)
1053 return (LIBUSB20_ERROR_INVALID_PARAM);
1054
1055 return (pdev->beMethods->dev_get_info(pdev, pinfo));
1056 }
1057
1058 const char *
libusb20_dev_get_backend_name(struct libusb20_device * pdev)1059 libusb20_dev_get_backend_name(struct libusb20_device *pdev)
1060 {
1061 return (pdev->beMethods->get_backend_name());
1062 }
1063
1064 const char *
libusb20_dev_get_desc(struct libusb20_device * pdev)1065 libusb20_dev_get_desc(struct libusb20_device *pdev)
1066 {
1067 return (pdev->usb_desc);
1068 }
1069
1070 void
libusb20_dev_set_debug(struct libusb20_device * pdev,int debug)1071 libusb20_dev_set_debug(struct libusb20_device *pdev, int debug)
1072 {
1073 pdev->debug = debug;
1074 return;
1075 }
1076
1077 int
libusb20_dev_get_debug(struct libusb20_device * pdev)1078 libusb20_dev_get_debug(struct libusb20_device *pdev)
1079 {
1080 return (pdev->debug);
1081 }
1082
1083 uint8_t
libusb20_dev_get_address(struct libusb20_device * pdev)1084 libusb20_dev_get_address(struct libusb20_device *pdev)
1085 {
1086 return (pdev->device_address);
1087 }
1088
1089 uint8_t
libusb20_dev_get_parent_address(struct libusb20_device * pdev)1090 libusb20_dev_get_parent_address(struct libusb20_device *pdev)
1091 {
1092 return (pdev->parent_address);
1093 }
1094
1095 uint8_t
libusb20_dev_get_parent_port(struct libusb20_device * pdev)1096 libusb20_dev_get_parent_port(struct libusb20_device *pdev)
1097 {
1098 return (pdev->parent_port);
1099 }
1100
1101 uint8_t
libusb20_dev_get_bus_number(struct libusb20_device * pdev)1102 libusb20_dev_get_bus_number(struct libusb20_device *pdev)
1103 {
1104 return (pdev->bus_number);
1105 }
1106
1107 int
libusb20_dev_get_iface_desc(struct libusb20_device * pdev,uint8_t iface_index,char * buf,uint8_t len)1108 libusb20_dev_get_iface_desc(struct libusb20_device *pdev,
1109 uint8_t iface_index, char *buf, uint8_t len)
1110 {
1111 if ((buf == NULL) || (len == 0))
1112 return (LIBUSB20_ERROR_INVALID_PARAM);
1113
1114 buf[0] = 0; /* set default string value */
1115
1116 return (pdev->beMethods->dev_get_iface_desc(
1117 pdev, iface_index, buf, len));
1118 }
1119
1120 /* USB backend operations */
1121
1122 int
libusb20_be_get_dev_quirk(struct libusb20_backend * pbe,uint16_t quirk_index,struct libusb20_quirk * pq)1123 libusb20_be_get_dev_quirk(struct libusb20_backend *pbe,
1124 uint16_t quirk_index, struct libusb20_quirk *pq)
1125 {
1126 return (pbe->methods->root_get_dev_quirk(pbe, quirk_index, pq));
1127 }
1128
1129 int
libusb20_be_get_quirk_name(struct libusb20_backend * pbe,uint16_t quirk_index,struct libusb20_quirk * pq)1130 libusb20_be_get_quirk_name(struct libusb20_backend *pbe,
1131 uint16_t quirk_index, struct libusb20_quirk *pq)
1132 {
1133 return (pbe->methods->root_get_quirk_name(pbe, quirk_index, pq));
1134 }
1135
1136 int
libusb20_be_add_dev_quirk(struct libusb20_backend * pbe,struct libusb20_quirk * pq)1137 libusb20_be_add_dev_quirk(struct libusb20_backend *pbe,
1138 struct libusb20_quirk *pq)
1139 {
1140 return (pbe->methods->root_add_dev_quirk(pbe, pq));
1141 }
1142
1143 int
libusb20_be_remove_dev_quirk(struct libusb20_backend * pbe,struct libusb20_quirk * pq)1144 libusb20_be_remove_dev_quirk(struct libusb20_backend *pbe,
1145 struct libusb20_quirk *pq)
1146 {
1147 return (pbe->methods->root_remove_dev_quirk(pbe, pq));
1148 }
1149
1150 int
libusb20_be_set_template(struct libusb20_backend * pbe,int temp)1151 libusb20_be_set_template(struct libusb20_backend *pbe, int temp)
1152 {
1153 return (pbe->methods->root_set_template(pbe, temp));
1154 }
1155
1156 int
libusb20_be_get_template(struct libusb20_backend * pbe,int * ptemp)1157 libusb20_be_get_template(struct libusb20_backend *pbe, int *ptemp)
1158 {
1159 int temp;
1160
1161 if (ptemp == NULL)
1162 ptemp = &temp;
1163
1164 return (pbe->methods->root_get_template(pbe, ptemp));
1165 }
1166
1167 struct libusb20_device *
libusb20_be_device_foreach(struct libusb20_backend * pbe,struct libusb20_device * pdev)1168 libusb20_be_device_foreach(struct libusb20_backend *pbe, struct libusb20_device *pdev)
1169 {
1170 if (pbe == NULL) {
1171 pdev = NULL;
1172 } else if (pdev == NULL) {
1173 pdev = TAILQ_FIRST(&(pbe->usb_devs));
1174 } else {
1175 pdev = TAILQ_NEXT(pdev, dev_entry);
1176 }
1177 return (pdev);
1178 }
1179
1180 struct libusb20_backend *
libusb20_be_alloc(const struct libusb20_backend_methods * methods)1181 libusb20_be_alloc(const struct libusb20_backend_methods *methods)
1182 {
1183 struct libusb20_backend *pbe;
1184
1185 pbe = malloc(sizeof(*pbe));
1186 if (pbe == NULL) {
1187 return (NULL);
1188 }
1189 memset(pbe, 0, sizeof(*pbe));
1190
1191 TAILQ_INIT(&(pbe->usb_devs));
1192
1193 pbe->methods = methods; /* set backend methods */
1194
1195 /* do the initial device scan */
1196 if (pbe->methods->init_backend) {
1197 pbe->methods->init_backend(pbe);
1198 }
1199 return (pbe);
1200 }
1201
1202 struct libusb20_backend *
libusb20_be_alloc_linux(void)1203 libusb20_be_alloc_linux(void)
1204 {
1205 return (NULL);
1206 }
1207
1208 struct libusb20_backend *
libusb20_be_alloc_ugen20(void)1209 libusb20_be_alloc_ugen20(void)
1210 {
1211 return (libusb20_be_alloc(&libusb20_ugen20_backend));
1212 }
1213
1214 struct libusb20_backend *
libusb20_be_alloc_default(void)1215 libusb20_be_alloc_default(void)
1216 {
1217 struct libusb20_backend *pbe;
1218
1219 #ifdef __linux__
1220 pbe = libusb20_be_alloc_linux();
1221 if (pbe) {
1222 return (pbe);
1223 }
1224 #endif
1225 pbe = libusb20_be_alloc_ugen20();
1226 if (pbe) {
1227 return (pbe);
1228 }
1229 return (NULL); /* no backend found */
1230 }
1231
1232 void
libusb20_be_free(struct libusb20_backend * pbe)1233 libusb20_be_free(struct libusb20_backend *pbe)
1234 {
1235 struct libusb20_device *pdev;
1236
1237 if (pbe == NULL) {
1238 /* be NULL safe */
1239 return;
1240 }
1241 while ((pdev = libusb20_be_device_foreach(pbe, NULL))) {
1242 libusb20_be_dequeue_device(pbe, pdev);
1243 libusb20_dev_free(pdev);
1244 }
1245 if (pbe->methods->exit_backend) {
1246 pbe->methods->exit_backend(pbe);
1247 }
1248 /* free backend */
1249 free(pbe);
1250 }
1251
1252 void
libusb20_be_enqueue_device(struct libusb20_backend * pbe,struct libusb20_device * pdev)1253 libusb20_be_enqueue_device(struct libusb20_backend *pbe, struct libusb20_device *pdev)
1254 {
1255 pdev->beMethods = pbe->methods; /* copy backend methods */
1256 TAILQ_INSERT_TAIL(&(pbe->usb_devs), pdev, dev_entry);
1257 }
1258
1259 void
libusb20_be_dequeue_device(struct libusb20_backend * pbe,struct libusb20_device * pdev)1260 libusb20_be_dequeue_device(struct libusb20_backend *pbe,
1261 struct libusb20_device *pdev)
1262 {
1263 TAILQ_REMOVE(&(pbe->usb_devs), pdev, dev_entry);
1264 }
1265
1266 const char *
libusb20_strerror(int code)1267 libusb20_strerror(int code)
1268 {
1269 switch (code) {
1270 case LIBUSB20_SUCCESS:
1271 return ("Success");
1272 case LIBUSB20_ERROR_IO:
1273 return ("I/O error");
1274 case LIBUSB20_ERROR_INVALID_PARAM:
1275 return ("Invalid parameter");
1276 case LIBUSB20_ERROR_ACCESS:
1277 return ("Permissions error");
1278 case LIBUSB20_ERROR_NO_DEVICE:
1279 return ("No device");
1280 case LIBUSB20_ERROR_NOT_FOUND:
1281 return ("Not found");
1282 case LIBUSB20_ERROR_BUSY:
1283 return ("Device busy");
1284 case LIBUSB20_ERROR_TIMEOUT:
1285 return ("Timeout");
1286 case LIBUSB20_ERROR_OVERFLOW:
1287 return ("Overflow");
1288 case LIBUSB20_ERROR_PIPE:
1289 return ("Pipe error");
1290 case LIBUSB20_ERROR_INTERRUPTED:
1291 return ("Interrupted");
1292 case LIBUSB20_ERROR_NO_MEM:
1293 return ("Out of memory");
1294 case LIBUSB20_ERROR_NOT_SUPPORTED:
1295 return ("Not supported");
1296 case LIBUSB20_ERROR_OTHER:
1297 return ("Other error");
1298 default:
1299 return ("Unknown error");
1300 }
1301 }
1302
1303 const char *
libusb20_error_name(int code)1304 libusb20_error_name(int code)
1305 {
1306 switch (code) {
1307 case LIBUSB20_SUCCESS:
1308 return ("LIBUSB20_SUCCESS");
1309 case LIBUSB20_ERROR_IO:
1310 return ("LIBUSB20_ERROR_IO");
1311 case LIBUSB20_ERROR_INVALID_PARAM:
1312 return ("LIBUSB20_ERROR_INVALID_PARAM");
1313 case LIBUSB20_ERROR_ACCESS:
1314 return ("LIBUSB20_ERROR_ACCESS");
1315 case LIBUSB20_ERROR_NO_DEVICE:
1316 return ("LIBUSB20_ERROR_NO_DEVICE");
1317 case LIBUSB20_ERROR_NOT_FOUND:
1318 return ("LIBUSB20_ERROR_NOT_FOUND");
1319 case LIBUSB20_ERROR_BUSY:
1320 return ("LIBUSB20_ERROR_BUSY");
1321 case LIBUSB20_ERROR_TIMEOUT:
1322 return ("LIBUSB20_ERROR_TIMEOUT");
1323 case LIBUSB20_ERROR_OVERFLOW:
1324 return ("LIBUSB20_ERROR_OVERFLOW");
1325 case LIBUSB20_ERROR_PIPE:
1326 return ("LIBUSB20_ERROR_PIPE");
1327 case LIBUSB20_ERROR_INTERRUPTED:
1328 return ("LIBUSB20_ERROR_INTERRUPTED");
1329 case LIBUSB20_ERROR_NO_MEM:
1330 return ("LIBUSB20_ERROR_NO_MEM");
1331 case LIBUSB20_ERROR_NOT_SUPPORTED:
1332 return ("LIBUSB20_ERROR_NOT_SUPPORTED");
1333 case LIBUSB20_ERROR_OTHER:
1334 return ("LIBUSB20_ERROR_OTHER");
1335 default:
1336 return ("LIBUSB20_ERROR_UNKNOWN");
1337 }
1338 }
1339