xref: /freebsd/lib/libusb/libusb20.c (revision 7778ab7e0cc22f0824eb1d1047a7ef8b4785267a)
1 /* $FreeBSD$ */
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 #include <sys/queue.h>
28 
29 #include <ctype.h>
30 #include <poll.h>
31 #include <stdio.h>
32 #include <stdlib.h>
33 #include <string.h>
34 
35 #include "libusb20.h"
36 #include "libusb20_desc.h"
37 #include "libusb20_int.h"
38 
39 static int
40 dummy_int(void)
41 {
42 	return (LIBUSB20_ERROR_NOT_SUPPORTED);
43 }
44 
45 static void
46 dummy_void(void)
47 {
48 	return;
49 }
50 
51 static void
52 dummy_callback(struct libusb20_transfer *xfer)
53 {
54 	;				/* style fix */
55 	switch (libusb20_tr_get_status(xfer)) {
56 	case LIBUSB20_TRANSFER_START:
57 		libusb20_tr_submit(xfer);
58 		break;
59 	default:
60 		/* complete or error */
61 		break;
62 	}
63 	return;
64 }
65 
66 #define	dummy_get_config_desc_full (void *)dummy_int
67 #define	dummy_get_config_index (void *)dummy_int
68 #define	dummy_set_config_index (void *)dummy_int
69 #define	dummy_set_alt_index (void *)dummy_int
70 #define	dummy_reset_device (void *)dummy_int
71 #define	dummy_check_connected (void *)dummy_int
72 #define	dummy_set_power_mode (void *)dummy_int
73 #define	dummy_get_power_mode (void *)dummy_int
74 #define	dummy_kernel_driver_active (void *)dummy_int
75 #define	dummy_detach_kernel_driver (void *)dummy_int
76 #define	dummy_do_request_sync (void *)dummy_int
77 #define	dummy_tr_open (void *)dummy_int
78 #define	dummy_tr_close (void *)dummy_int
79 #define	dummy_tr_clear_stall_sync (void *)dummy_int
80 #define	dummy_process (void *)dummy_int
81 #define	dummy_dev_info (void *)dummy_int
82 #define	dummy_dev_get_iface_driver (void *)dummy_int
83 
84 #define	dummy_tr_submit (void *)dummy_void
85 #define	dummy_tr_cancel_async (void *)dummy_void
86 
87 static const struct libusb20_device_methods libusb20_dummy_methods = {
88 	LIBUSB20_DEVICE(LIBUSB20_DECLARE, dummy)
89 };
90 
91 void
92 libusb20_tr_callback_wrapper(struct libusb20_transfer *xfer)
93 {
94 	;				/* style fix */
95 
96 repeat:
97 
98 	if (!xfer->is_pending) {
99 		xfer->status = LIBUSB20_TRANSFER_START;
100 	} else {
101 		xfer->is_pending = 0;
102 	}
103 
104 	xfer->callback(xfer);
105 
106 	if (xfer->is_restart) {
107 		xfer->is_restart = 0;
108 		goto repeat;
109 	}
110 	if (xfer->is_draining &&
111 	    (!xfer->is_pending)) {
112 		xfer->is_draining = 0;
113 		xfer->status = LIBUSB20_TRANSFER_DRAINED;
114 		xfer->callback(xfer);
115 	}
116 	return;
117 }
118 
119 int
120 libusb20_tr_close(struct libusb20_transfer *xfer)
121 {
122 	int error;
123 
124 	if (!xfer->is_opened) {
125 		return (LIBUSB20_ERROR_OTHER);
126 	}
127 	error = xfer->pdev->methods->tr_close(xfer);
128 
129 	if (xfer->pLength) {
130 		free(xfer->pLength);
131 	}
132 	if (xfer->ppBuffer) {
133 		free(xfer->ppBuffer);
134 	}
135 	/* reset variable fields in case the transfer is opened again */
136 	xfer->priv_sc0 = 0;
137 	xfer->priv_sc1 = 0;
138 	xfer->is_opened = 0;
139 	xfer->is_pending = 0;
140 	xfer->is_cancel = 0;
141 	xfer->is_draining = 0;
142 	xfer->is_restart = 0;
143 	xfer->status = 0;
144 	xfer->flags = 0;
145 	xfer->nFrames = 0;
146 	xfer->aFrames = 0;
147 	xfer->timeout = 0;
148 	xfer->maxFrames = 0;
149 	xfer->maxTotalLength = 0;
150 	xfer->maxPacketLen = 0;
151 	return (error);
152 }
153 
154 int
155 libusb20_tr_open(struct libusb20_transfer *xfer, uint32_t MaxBufSize,
156     uint32_t MaxFrameCount, uint8_t ep_no)
157 {
158 	uint32_t size;
159 	uint8_t pre_scale;
160 	int error;
161 
162 	if (xfer->is_opened)
163 		return (LIBUSB20_ERROR_BUSY);
164 	if (MaxFrameCount & LIBUSB20_MAX_FRAME_PRE_SCALE) {
165 		MaxFrameCount &= ~LIBUSB20_MAX_FRAME_PRE_SCALE;
166 		pre_scale = 1;
167 	} else {
168 		pre_scale = 0;
169 	}
170 	if (MaxFrameCount == 0)
171 		return (LIBUSB20_ERROR_INVALID_PARAM);
172 
173 	xfer->maxFrames = MaxFrameCount;
174 
175 	size = MaxFrameCount * sizeof(xfer->pLength[0]);
176 	xfer->pLength = malloc(size);
177 	if (xfer->pLength == NULL) {
178 		return (LIBUSB20_ERROR_NO_MEM);
179 	}
180 	memset(xfer->pLength, 0, size);
181 
182 	size = MaxFrameCount * sizeof(xfer->ppBuffer[0]);
183 	xfer->ppBuffer = malloc(size);
184 	if (xfer->ppBuffer == NULL) {
185 		free(xfer->pLength);
186 		return (LIBUSB20_ERROR_NO_MEM);
187 	}
188 	memset(xfer->ppBuffer, 0, size);
189 
190 	error = xfer->pdev->methods->tr_open(xfer, MaxBufSize,
191 	    MaxFrameCount, ep_no, pre_scale);
192 
193 	if (error) {
194 		free(xfer->ppBuffer);
195 		free(xfer->pLength);
196 	} else {
197 		xfer->is_opened = 1;
198 	}
199 	return (error);
200 }
201 
202 struct libusb20_transfer *
203 libusb20_tr_get_pointer(struct libusb20_device *pdev, uint16_t trIndex)
204 {
205 	if (trIndex >= pdev->nTransfer) {
206 		return (NULL);
207 	}
208 	return (pdev->pTransfer + trIndex);
209 }
210 
211 uint32_t
212 libusb20_tr_get_actual_frames(struct libusb20_transfer *xfer)
213 {
214 	return (xfer->aFrames);
215 }
216 
217 uint16_t
218 libusb20_tr_get_time_complete(struct libusb20_transfer *xfer)
219 {
220 	return (xfer->timeComplete);
221 }
222 
223 uint32_t
224 libusb20_tr_get_actual_length(struct libusb20_transfer *xfer)
225 {
226 	uint32_t x;
227 	uint32_t actlen = 0;
228 
229 	for (x = 0; x != xfer->aFrames; x++) {
230 		actlen += xfer->pLength[x];
231 	}
232 	return (actlen);
233 }
234 
235 uint32_t
236 libusb20_tr_get_max_frames(struct libusb20_transfer *xfer)
237 {
238 	return (xfer->maxFrames);
239 }
240 
241 uint32_t
242 libusb20_tr_get_max_packet_length(struct libusb20_transfer *xfer)
243 {
244 	/*
245 	 * Special Case NOTE: If the packet multiplier is non-zero for
246 	 * High Speed USB, the value returned is equal to
247 	 * "wMaxPacketSize * multiplier" !
248 	 */
249 	return (xfer->maxPacketLen);
250 }
251 
252 uint32_t
253 libusb20_tr_get_max_total_length(struct libusb20_transfer *xfer)
254 {
255 	return (xfer->maxTotalLength);
256 }
257 
258 uint8_t
259 libusb20_tr_get_status(struct libusb20_transfer *xfer)
260 {
261 	return (xfer->status);
262 }
263 
264 uint8_t
265 libusb20_tr_pending(struct libusb20_transfer *xfer)
266 {
267 	return (xfer->is_pending);
268 }
269 
270 void   *
271 libusb20_tr_get_priv_sc0(struct libusb20_transfer *xfer)
272 {
273 	return (xfer->priv_sc0);
274 }
275 
276 void   *
277 libusb20_tr_get_priv_sc1(struct libusb20_transfer *xfer)
278 {
279 	return (xfer->priv_sc1);
280 }
281 
282 void
283 libusb20_tr_stop(struct libusb20_transfer *xfer)
284 {
285 	if (!xfer->is_opened) {
286 		/* transfer is not opened */
287 		return;
288 	}
289 	if (!xfer->is_pending) {
290 		/* transfer not pending */
291 		return;
292 	}
293 	if (xfer->is_cancel) {
294 		/* already cancelling */
295 		return;
296 	}
297 	xfer->is_cancel = 1;		/* we are cancelling */
298 
299 	xfer->pdev->methods->tr_cancel_async(xfer);
300 	return;
301 }
302 
303 void
304 libusb20_tr_drain(struct libusb20_transfer *xfer)
305 {
306 	if (!xfer->is_opened) {
307 		/* transfer is not opened */
308 		return;
309 	}
310 	/* make sure that we are cancelling */
311 	libusb20_tr_stop(xfer);
312 
313 	if (xfer->is_pending) {
314 		xfer->is_draining = 1;
315 	}
316 	return;
317 }
318 
319 void
320 libusb20_tr_clear_stall_sync(struct libusb20_transfer *xfer)
321 {
322 	xfer->pdev->methods->tr_clear_stall_sync(xfer);
323 	return;
324 }
325 
326 void
327 libusb20_tr_set_buffer(struct libusb20_transfer *xfer, void *buffer, uint16_t frIndex)
328 {
329 	xfer->ppBuffer[frIndex] = libusb20_pass_ptr(buffer);
330 	return;
331 }
332 
333 void
334 libusb20_tr_set_callback(struct libusb20_transfer *xfer, libusb20_tr_callback_t *cb)
335 {
336 	xfer->callback = cb;
337 	return;
338 }
339 
340 void
341 libusb20_tr_set_flags(struct libusb20_transfer *xfer, uint8_t flags)
342 {
343 	xfer->flags = flags;
344 	return;
345 }
346 
347 uint32_t
348 libusb20_tr_get_length(struct libusb20_transfer *xfer, uint16_t frIndex)
349 {
350 	return (xfer->pLength[frIndex]);
351 }
352 
353 void
354 libusb20_tr_set_length(struct libusb20_transfer *xfer, uint32_t length, uint16_t frIndex)
355 {
356 	xfer->pLength[frIndex] = length;
357 	return;
358 }
359 
360 void
361 libusb20_tr_set_priv_sc0(struct libusb20_transfer *xfer, void *sc0)
362 {
363 	xfer->priv_sc0 = sc0;
364 	return;
365 }
366 
367 void
368 libusb20_tr_set_priv_sc1(struct libusb20_transfer *xfer, void *sc1)
369 {
370 	xfer->priv_sc1 = sc1;
371 	return;
372 }
373 
374 void
375 libusb20_tr_set_timeout(struct libusb20_transfer *xfer, uint32_t timeout)
376 {
377 	xfer->timeout = timeout;
378 	return;
379 }
380 
381 void
382 libusb20_tr_set_total_frames(struct libusb20_transfer *xfer, uint32_t nFrames)
383 {
384 	if (nFrames > xfer->maxFrames) {
385 		/* should not happen */
386 		nFrames = xfer->maxFrames;
387 	}
388 	xfer->nFrames = nFrames;
389 	return;
390 }
391 
392 void
393 libusb20_tr_setup_bulk(struct libusb20_transfer *xfer, void *pBuf, uint32_t length, uint32_t timeout)
394 {
395 	xfer->ppBuffer[0] = libusb20_pass_ptr(pBuf);
396 	xfer->pLength[0] = length;
397 	xfer->timeout = timeout;
398 	xfer->nFrames = 1;
399 	return;
400 }
401 
402 void
403 libusb20_tr_setup_control(struct libusb20_transfer *xfer, void *psetup, void *pBuf, uint32_t timeout)
404 {
405 	uint16_t len;
406 
407 	xfer->ppBuffer[0] = libusb20_pass_ptr(psetup);
408 	xfer->pLength[0] = 8;		/* fixed */
409 	xfer->timeout = timeout;
410 
411 	len = ((uint8_t *)psetup)[6] | (((uint8_t *)psetup)[7] << 8);
412 
413 	if (len != 0) {
414 		xfer->nFrames = 2;
415 		xfer->ppBuffer[1] = libusb20_pass_ptr(pBuf);
416 		xfer->pLength[1] = len;
417 	} else {
418 		xfer->nFrames = 1;
419 	}
420 	return;
421 }
422 
423 void
424 libusb20_tr_setup_intr(struct libusb20_transfer *xfer, void *pBuf, uint32_t length, uint32_t timeout)
425 {
426 	xfer->ppBuffer[0] = libusb20_pass_ptr(pBuf);
427 	xfer->pLength[0] = length;
428 	xfer->timeout = timeout;
429 	xfer->nFrames = 1;
430 	return;
431 }
432 
433 void
434 libusb20_tr_setup_isoc(struct libusb20_transfer *xfer, void *pBuf, uint32_t length, uint16_t frIndex)
435 {
436 	if (frIndex >= xfer->maxFrames) {
437 		/* should not happen */
438 		return;
439 	}
440 	xfer->ppBuffer[frIndex] = libusb20_pass_ptr(pBuf);
441 	xfer->pLength[frIndex] = length;
442 	return;
443 }
444 
445 uint8_t
446 libusb20_tr_bulk_intr_sync(struct libusb20_transfer *xfer,
447     void *pbuf, uint32_t length, uint32_t *pactlen,
448     uint32_t timeout)
449 {
450 	struct libusb20_device *pdev = xfer->pdev;
451 	uint32_t transfer_max;
452 	uint32_t transfer_act;
453 	uint8_t retval;
454 
455 	/* set some sensible default value */
456 	if (pactlen != NULL)
457 		*pactlen = 0;
458 
459 	/* check for error condition */
460 	if (libusb20_tr_pending(xfer))
461 		return (LIBUSB20_ERROR_OTHER);
462 
463 	do {
464 		/* compute maximum transfer length */
465 		transfer_max =
466 		    libusb20_tr_get_max_total_length(xfer);
467 
468 		if (transfer_max > length)
469 			transfer_max = length;
470 
471 		/* setup bulk or interrupt transfer */
472 		libusb20_tr_setup_bulk(xfer, pbuf,
473 		    transfer_max, timeout);
474 
475 		/* start the transfer */
476 		libusb20_tr_start(xfer);
477 
478 		/* wait for transfer completion */
479 		while (libusb20_dev_process(pdev) == 0) {
480 
481 			if (libusb20_tr_pending(xfer) == 0)
482 				break;
483 
484 			libusb20_dev_wait_process(pdev, -1);
485 		}
486 
487 		transfer_act = libusb20_tr_get_actual_length(xfer);
488 
489 		/* update actual length, if any */
490 		if (pactlen != NULL)
491 			pactlen[0] += transfer_act;
492 
493 		/* check transfer status */
494 		retval = libusb20_tr_get_status(xfer);
495 		if (retval)
496 			break;
497 
498 		/* check for short transfer */
499 		if (transfer_act != transfer_max)
500 			break;
501 
502 		/* update buffer pointer and length */
503 		pbuf = ((uint8_t *)pbuf) + transfer_max;
504 		length = length - transfer_max;
505 
506 	} while (length != 0);
507 
508 	return (retval);
509 }
510 
511 void
512 libusb20_tr_submit(struct libusb20_transfer *xfer)
513 {
514 	if (!xfer->is_opened) {
515 		/* transfer is not opened */
516 		return;
517 	}
518 	if (xfer->is_pending) {
519 		/* should not happen */
520 		return;
521 	}
522 	xfer->is_pending = 1;		/* we are pending */
523 	xfer->is_cancel = 0;		/* not cancelling */
524 	xfer->is_restart = 0;		/* not restarting */
525 
526 	xfer->pdev->methods->tr_submit(xfer);
527 	return;
528 }
529 
530 void
531 libusb20_tr_start(struct libusb20_transfer *xfer)
532 {
533 	if (!xfer->is_opened) {
534 		/* transfer is not opened */
535 		return;
536 	}
537 	if (xfer->is_pending) {
538 		if (xfer->is_cancel) {
539 			/* cancelling - restart */
540 			xfer->is_restart = 1;
541 		}
542 		/* transfer not pending */
543 		return;
544 	}
545 	/* get into the callback */
546 	libusb20_tr_callback_wrapper(xfer);
547 	return;
548 }
549 
550 /* USB device operations */
551 
552 int
553 libusb20_dev_close(struct libusb20_device *pdev)
554 {
555 	struct libusb20_transfer *xfer;
556 	uint16_t x;
557 	int error = 0;
558 
559 	if (!pdev->is_opened) {
560 		return (LIBUSB20_ERROR_OTHER);
561 	}
562 	for (x = 0; x != pdev->nTransfer; x++) {
563 		xfer = pdev->pTransfer + x;
564 
565 		if (!xfer->is_opened) {
566 			/* transfer is not opened */
567 			continue;
568 		}
569 
570 		libusb20_tr_drain(xfer);
571 
572 		libusb20_tr_close(xfer);
573 	}
574 
575 	if (pdev->pTransfer != NULL) {
576 		free(pdev->pTransfer);
577 		pdev->pTransfer = NULL;
578 	}
579 	error = pdev->beMethods->close_device(pdev);
580 
581 	pdev->methods = &libusb20_dummy_methods;
582 
583 	pdev->is_opened = 0;
584 
585 	/*
586 	 * The following variable is only used by the libusb v0.1
587 	 * compat layer:
588 	 */
589 	pdev->claimed_interface = 0;
590 
591 	return (error);
592 }
593 
594 int
595 libusb20_dev_detach_kernel_driver(struct libusb20_device *pdev, uint8_t ifaceIndex)
596 {
597 	int error;
598 
599 	error = pdev->methods->detach_kernel_driver(pdev, ifaceIndex);
600 	return (error);
601 }
602 
603 struct LIBUSB20_DEVICE_DESC_DECODED *
604 libusb20_dev_get_device_desc(struct libusb20_device *pdev)
605 {
606 	return (&(pdev->ddesc));
607 }
608 
609 int
610 libusb20_dev_get_fd(struct libusb20_device *pdev)
611 {
612 	return (pdev->file);
613 }
614 
615 int
616 libusb20_dev_kernel_driver_active(struct libusb20_device *pdev, uint8_t ifaceIndex)
617 {
618 	int error;
619 
620 	error = pdev->methods->kernel_driver_active(pdev, ifaceIndex);
621 	return (error);
622 }
623 
624 int
625 libusb20_dev_open(struct libusb20_device *pdev, uint16_t nTransferMax)
626 {
627 	struct libusb20_transfer *xfer;
628 	uint32_t size;
629 	uint16_t x;
630 	int error;
631 
632 	if (pdev->is_opened) {
633 		return (LIBUSB20_ERROR_BUSY);
634 	}
635 	if (nTransferMax >= 256) {
636 		return (LIBUSB20_ERROR_INVALID_PARAM);
637 	} else if (nTransferMax != 0) {
638 		size = sizeof(pdev->pTransfer[0]) * nTransferMax;
639 		pdev->pTransfer = malloc(size);
640 		if (pdev->pTransfer == NULL) {
641 			return (LIBUSB20_ERROR_NO_MEM);
642 		}
643 		memset(pdev->pTransfer, 0, size);
644 	}
645 	/* initialise all transfers */
646 	for (x = 0; x != nTransferMax; x++) {
647 
648 		xfer = pdev->pTransfer + x;
649 
650 		xfer->pdev = pdev;
651 		xfer->trIndex = x;
652 		xfer->callback = &dummy_callback;
653 	}
654 
655 	/* set "nTransfer" early */
656 	pdev->nTransfer = nTransferMax;
657 
658 	error = pdev->beMethods->open_device(pdev, nTransferMax);
659 
660 	if (error) {
661 		if (pdev->pTransfer != NULL) {
662 			free(pdev->pTransfer);
663 			pdev->pTransfer = NULL;
664 		}
665 		pdev->file = -1;
666 		pdev->file_ctrl = -1;
667 		pdev->nTransfer = 0;
668 	} else {
669 		pdev->is_opened = 1;
670 	}
671 	return (error);
672 }
673 
674 int
675 libusb20_dev_reset(struct libusb20_device *pdev)
676 {
677 	int error;
678 
679 	error = pdev->methods->reset_device(pdev);
680 	return (error);
681 }
682 
683 int
684 libusb20_dev_check_connected(struct libusb20_device *pdev)
685 {
686 	int error;
687 
688 	error = pdev->methods->check_connected(pdev);
689 	return (error);
690 }
691 
692 int
693 libusb20_dev_set_power_mode(struct libusb20_device *pdev, uint8_t power_mode)
694 {
695 	int error;
696 
697 	error = pdev->methods->set_power_mode(pdev, power_mode);
698 	return (error);
699 }
700 
701 uint8_t
702 libusb20_dev_get_power_mode(struct libusb20_device *pdev)
703 {
704 	int error;
705 	uint8_t power_mode;
706 
707 	error = pdev->methods->get_power_mode(pdev, &power_mode);
708 	if (error)
709 		power_mode = LIBUSB20_POWER_ON;	/* fake power mode */
710 	return (power_mode);
711 }
712 
713 int
714 libusb20_dev_set_alt_index(struct libusb20_device *pdev, uint8_t ifaceIndex, uint8_t altIndex)
715 {
716 	int error;
717 
718 	error = pdev->methods->set_alt_index(pdev, ifaceIndex, altIndex);
719 	return (error);
720 }
721 
722 int
723 libusb20_dev_set_config_index(struct libusb20_device *pdev, uint8_t configIndex)
724 {
725 	int error;
726 
727 	error = pdev->methods->set_config_index(pdev, configIndex);
728 	return (error);
729 }
730 
731 int
732 libusb20_dev_request_sync(struct libusb20_device *pdev,
733     struct LIBUSB20_CONTROL_SETUP_DECODED *setup, void *data,
734     uint16_t *pactlen, uint32_t timeout, uint8_t flags)
735 {
736 	int error;
737 
738 	error = pdev->methods->do_request_sync(pdev,
739 	    setup, data, pactlen, timeout, flags);
740 	return (error);
741 }
742 
743 int
744 libusb20_dev_req_string_sync(struct libusb20_device *pdev,
745     uint8_t str_index, uint16_t langid, void *ptr, uint16_t len)
746 {
747 	struct LIBUSB20_CONTROL_SETUP_DECODED req;
748 	int error;
749 
750 	/* make sure memory is initialised */
751 	memset(ptr, 0, len);
752 
753 	if (len < 4) {
754 		/* invalid length */
755 		return (LIBUSB20_ERROR_INVALID_PARAM);
756 	}
757 	LIBUSB20_INIT(LIBUSB20_CONTROL_SETUP, &req);
758 
759 	/*
760 	 * We need to read the USB string in two steps else some USB
761 	 * devices will complain.
762 	 */
763 	req.bmRequestType =
764 	    LIBUSB20_REQUEST_TYPE_STANDARD |
765 	    LIBUSB20_RECIPIENT_DEVICE |
766 	    LIBUSB20_ENDPOINT_IN;
767 	req.bRequest = LIBUSB20_REQUEST_GET_DESCRIPTOR;
768 	req.wValue = (LIBUSB20_DT_STRING << 8) | str_index;
769 	req.wIndex = langid;
770 	req.wLength = 4;		/* bytes */
771 
772 	error = libusb20_dev_request_sync(pdev, &req,
773 	    ptr, NULL, 1000, LIBUSB20_TRANSFER_SINGLE_SHORT_NOT_OK);
774 	if (error) {
775 		return (error);
776 	}
777 	req.wLength = *(uint8_t *)ptr;	/* bytes */
778 	if (req.wLength > len) {
779 		/* partial string read */
780 		req.wLength = len;
781 	}
782 	error = libusb20_dev_request_sync(pdev, &req,
783 	    ptr, NULL, 1000, LIBUSB20_TRANSFER_SINGLE_SHORT_NOT_OK);
784 
785 	if (error) {
786 		return (error);
787 	}
788 	if (((uint8_t *)ptr)[1] != LIBUSB20_DT_STRING) {
789 		return (LIBUSB20_ERROR_OTHER);
790 	}
791 	return (0);			/* success */
792 }
793 
794 int
795 libusb20_dev_req_string_simple_sync(struct libusb20_device *pdev,
796     uint8_t str_index, void *ptr, uint16_t len)
797 {
798 	char *buf;
799 	int error;
800 	uint16_t langid;
801 	uint16_t n;
802 	uint16_t i;
803 	uint16_t c;
804 	uint8_t temp[255];
805 	uint8_t swap;
806 
807 	/* the following code derives from the FreeBSD USB kernel */
808 
809 	if ((len < 1) || (ptr == NULL)) {
810 		/* too short buffer */
811 		return (LIBUSB20_ERROR_INVALID_PARAM);
812 	}
813 	error = libusb20_dev_req_string_sync(pdev,
814 	    0, 0, temp, sizeof(temp));
815 	if (error < 0) {
816 		*(uint8_t *)ptr = 0;	/* zero terminate */
817 		return (error);
818 	}
819 	langid = temp[2] | (temp[3] << 8);
820 
821 	error = libusb20_dev_req_string_sync(pdev, str_index,
822 	    langid, temp, sizeof(temp));
823 	if (error < 0) {
824 		*(uint8_t *)ptr = 0;	/* zero terminate */
825 		return (error);
826 	}
827 	if (temp[0] < 2) {
828 		/* string length is too short */
829 		*(uint8_t *)ptr = 0;	/* zero terminate */
830 		return (LIBUSB20_ERROR_OTHER);
831 	}
832 	/* reserve one byte for terminating zero */
833 	len--;
834 
835 	/* find maximum length */
836 	n = (temp[0] / 2) - 1;
837 	if (n > len) {
838 		n = len;
839 	}
840 	/* reset swap state */
841 	swap = 3;
842 
843 	/* setup output buffer pointer */
844 	buf = ptr;
845 
846 	/* convert and filter */
847 	for (i = 0; (i != n); i++) {
848 		c = temp[(2 * i) + 2] | (temp[(2 * i) + 3] << 8);
849 
850 		/* convert from Unicode, handle buggy strings */
851 		if (((c & 0xff00) == 0) && (swap & 1)) {
852 			/* Little Endian, default */
853 			*buf = c;
854 			swap = 1;
855 		} else if (((c & 0x00ff) == 0) && (swap & 2)) {
856 			/* Big Endian */
857 			*buf = c >> 8;
858 			swap = 2;
859 		} else {
860 			/* skip invalid character */
861 			continue;
862 		}
863 		/*
864 		 * Filter by default - we don't allow greater and less than
865 		 * signs because they might confuse the dmesg printouts!
866 		 */
867 		if ((*buf == '<') || (*buf == '>') || (!isprint(*buf))) {
868 			/* skip invalid character */
869 			continue;
870 		}
871 		buf++;
872 	}
873 	*buf = 0;			/* zero terminate string */
874 
875 	return (0);
876 }
877 
878 struct libusb20_config *
879 libusb20_dev_alloc_config(struct libusb20_device *pdev, uint8_t configIndex)
880 {
881 	struct libusb20_config *retval = NULL;
882 	uint8_t *ptr;
883 	uint16_t len;
884 	uint8_t do_close;
885 	int error;
886 
887 	if (!pdev->is_opened) {
888 		error = libusb20_dev_open(pdev, 0);
889 		if (error) {
890 			return (NULL);
891 		}
892 		do_close = 1;
893 	} else {
894 		do_close = 0;
895 	}
896 	error = pdev->methods->get_config_desc_full(pdev,
897 	    &ptr, &len, configIndex);
898 
899 	if (error) {
900 		goto done;
901 	}
902 	/* parse new config descriptor */
903 	retval = libusb20_parse_config_desc(ptr);
904 
905 	/* free config descriptor */
906 	free(ptr);
907 
908 done:
909 	if (do_close) {
910 		error = libusb20_dev_close(pdev);
911 	}
912 	return (retval);
913 }
914 
915 struct libusb20_device *
916 libusb20_dev_alloc(void)
917 {
918 	struct libusb20_device *pdev;
919 
920 	pdev = malloc(sizeof(*pdev));
921 	if (pdev == NULL) {
922 		return (NULL);
923 	}
924 	memset(pdev, 0, sizeof(*pdev));
925 
926 	pdev->file = -1;
927 	pdev->file_ctrl = -1;
928 	pdev->methods = &libusb20_dummy_methods;
929 	return (pdev);
930 }
931 
932 uint8_t
933 libusb20_dev_get_config_index(struct libusb20_device *pdev)
934 {
935 	int error;
936 	uint8_t cfg_index;
937 	uint8_t do_close;
938 
939 	if (!pdev->is_opened) {
940 		error = libusb20_dev_open(pdev, 0);
941 		if (error == 0) {
942 			do_close = 1;
943 		} else {
944 			do_close = 0;
945 		}
946 	} else {
947 		do_close = 0;
948 	}
949 
950 	error = pdev->methods->get_config_index(pdev, &cfg_index);
951 	if (error) {
952 		cfg_index = 0 - 1;	/* current config index */
953 	}
954 	if (do_close) {
955 		if (libusb20_dev_close(pdev)) {
956 			/* ignore */
957 		}
958 	}
959 	return (cfg_index);
960 }
961 
962 uint8_t
963 libusb20_dev_get_mode(struct libusb20_device *pdev)
964 {
965 	return (pdev->usb_mode);
966 }
967 
968 uint8_t
969 libusb20_dev_get_speed(struct libusb20_device *pdev)
970 {
971 	return (pdev->usb_speed);
972 }
973 
974 /* if this function returns an error, the device is gone */
975 int
976 libusb20_dev_process(struct libusb20_device *pdev)
977 {
978 	int error;
979 
980 	error = pdev->methods->process(pdev);
981 	return (error);
982 }
983 
984 void
985 libusb20_dev_wait_process(struct libusb20_device *pdev, int timeout)
986 {
987 	struct pollfd pfd[1];
988 
989 	if (!pdev->is_opened) {
990 		return;
991 	}
992 	pfd[0].fd = pdev->file;
993 	pfd[0].events = (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM);
994 	pfd[0].revents = 0;
995 
996 	if (poll(pfd, 1, timeout)) {
997 		/* ignore any error */
998 	}
999 	return;
1000 }
1001 
1002 void
1003 libusb20_dev_free(struct libusb20_device *pdev)
1004 {
1005 	if (pdev == NULL) {
1006 		/* be NULL safe */
1007 		return;
1008 	}
1009 	if (pdev->is_opened) {
1010 		if (libusb20_dev_close(pdev)) {
1011 			/* ignore any errors */
1012 		}
1013 	}
1014 	free(pdev);
1015 	return;
1016 }
1017 
1018 int
1019 libusb20_dev_get_info(struct libusb20_device *pdev,
1020     struct usb_device_info *pinfo)
1021 {
1022 	if (pinfo == NULL)
1023 		return (LIBUSB20_ERROR_INVALID_PARAM);
1024 
1025 	return (pdev->beMethods->dev_get_info(pdev, pinfo));
1026 }
1027 
1028 const char *
1029 libusb20_dev_get_backend_name(struct libusb20_device *pdev)
1030 {
1031 	return (pdev->beMethods->get_backend_name());
1032 }
1033 
1034 const char *
1035 libusb20_dev_get_desc(struct libusb20_device *pdev)
1036 {
1037 	return (pdev->usb_desc);
1038 }
1039 
1040 void
1041 libusb20_dev_set_debug(struct libusb20_device *pdev, int debug)
1042 {
1043 	pdev->debug = debug;
1044 	return;
1045 }
1046 
1047 int
1048 libusb20_dev_get_debug(struct libusb20_device *pdev)
1049 {
1050 	return (pdev->debug);
1051 }
1052 
1053 uint8_t
1054 libusb20_dev_get_address(struct libusb20_device *pdev)
1055 {
1056 	return (pdev->device_address);
1057 }
1058 
1059 uint8_t
1060 libusb20_dev_get_parent_address(struct libusb20_device *pdev)
1061 {
1062 	return (pdev->parent_address);
1063 }
1064 
1065 uint8_t
1066 libusb20_dev_get_parent_port(struct libusb20_device *pdev)
1067 {
1068 	return (pdev->parent_port);
1069 }
1070 
1071 uint8_t
1072 libusb20_dev_get_bus_number(struct libusb20_device *pdev)
1073 {
1074 	return (pdev->bus_number);
1075 }
1076 
1077 int
1078 libusb20_dev_get_iface_desc(struct libusb20_device *pdev,
1079     uint8_t iface_index, char *buf, uint8_t len)
1080 {
1081 	if ((buf == NULL) || (len == 0))
1082 		return (LIBUSB20_ERROR_INVALID_PARAM);
1083 
1084 	buf[0] = 0;		/* set default string value */
1085 
1086 	return (pdev->beMethods->dev_get_iface_desc(
1087 	    pdev, iface_index, buf, len));
1088 }
1089 
1090 /* USB backend operations */
1091 
1092 int
1093 libusb20_be_get_dev_quirk(struct libusb20_backend *pbe,
1094     uint16_t quirk_index, struct libusb20_quirk *pq)
1095 {
1096 	return (pbe->methods->root_get_dev_quirk(pbe, quirk_index, pq));
1097 }
1098 
1099 int
1100 libusb20_be_get_quirk_name(struct libusb20_backend *pbe,
1101     uint16_t quirk_index, struct libusb20_quirk *pq)
1102 {
1103 	return (pbe->methods->root_get_quirk_name(pbe, quirk_index, pq));
1104 }
1105 
1106 int
1107 libusb20_be_add_dev_quirk(struct libusb20_backend *pbe,
1108     struct libusb20_quirk *pq)
1109 {
1110 	return (pbe->methods->root_add_dev_quirk(pbe, pq));
1111 }
1112 
1113 int
1114 libusb20_be_remove_dev_quirk(struct libusb20_backend *pbe,
1115     struct libusb20_quirk *pq)
1116 {
1117 	return (pbe->methods->root_remove_dev_quirk(pbe, pq));
1118 }
1119 
1120 int
1121 libusb20_be_set_template(struct libusb20_backend *pbe, int temp)
1122 {
1123 	return (pbe->methods->root_set_template(pbe, temp));
1124 }
1125 
1126 int
1127 libusb20_be_get_template(struct libusb20_backend *pbe, int *ptemp)
1128 {
1129 	int temp;
1130 
1131 	if (ptemp == NULL)
1132 		ptemp = &temp;
1133 
1134 	return (pbe->methods->root_get_template(pbe, ptemp));
1135 }
1136 
1137 struct libusb20_device *
1138 libusb20_be_device_foreach(struct libusb20_backend *pbe, struct libusb20_device *pdev)
1139 {
1140 	if (pbe == NULL) {
1141 		pdev = NULL;
1142 	} else if (pdev == NULL) {
1143 		pdev = TAILQ_FIRST(&(pbe->usb_devs));
1144 	} else {
1145 		pdev = TAILQ_NEXT(pdev, dev_entry);
1146 	}
1147 	return (pdev);
1148 }
1149 
1150 struct libusb20_backend *
1151 libusb20_be_alloc(const struct libusb20_backend_methods *methods)
1152 {
1153 	struct libusb20_backend *pbe;
1154 
1155 	pbe = malloc(sizeof(*pbe));
1156 	if (pbe == NULL) {
1157 		return (NULL);
1158 	}
1159 	memset(pbe, 0, sizeof(*pbe));
1160 
1161 	TAILQ_INIT(&(pbe->usb_devs));
1162 
1163 	pbe->methods = methods;		/* set backend methods */
1164 
1165 	/* do the initial device scan */
1166 	if (pbe->methods->init_backend) {
1167 		pbe->methods->init_backend(pbe);
1168 	}
1169 	return (pbe);
1170 }
1171 
1172 struct libusb20_backend *
1173 libusb20_be_alloc_linux(void)
1174 {
1175 	struct libusb20_backend *pbe;
1176 
1177 #ifdef __linux__
1178 	pbe = libusb20_be_alloc(&libusb20_linux_backend);
1179 #else
1180 	pbe = NULL;
1181 #endif
1182 	return (pbe);
1183 }
1184 
1185 struct libusb20_backend *
1186 libusb20_be_alloc_ugen20(void)
1187 {
1188 	struct libusb20_backend *pbe;
1189 
1190 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
1191 	pbe = libusb20_be_alloc(&libusb20_ugen20_backend);
1192 #else
1193 	pbe = NULL;
1194 #endif
1195 	return (pbe);
1196 }
1197 
1198 struct libusb20_backend *
1199 libusb20_be_alloc_default(void)
1200 {
1201 	struct libusb20_backend *pbe;
1202 
1203 	pbe = libusb20_be_alloc_linux();
1204 	if (pbe) {
1205 		return (pbe);
1206 	}
1207 	pbe = libusb20_be_alloc_ugen20();
1208 	if (pbe) {
1209 		return (pbe);
1210 	}
1211 	return (NULL);			/* no backend found */
1212 }
1213 
1214 void
1215 libusb20_be_free(struct libusb20_backend *pbe)
1216 {
1217 	struct libusb20_device *pdev;
1218 
1219 	if (pbe == NULL) {
1220 		/* be NULL safe */
1221 		return;
1222 	}
1223 	while ((pdev = libusb20_be_device_foreach(pbe, NULL))) {
1224 		libusb20_be_dequeue_device(pbe, pdev);
1225 		libusb20_dev_free(pdev);
1226 	}
1227 	if (pbe->methods->exit_backend) {
1228 		pbe->methods->exit_backend(pbe);
1229 	}
1230 	/* free backend */
1231 	free(pbe);
1232 }
1233 
1234 void
1235 libusb20_be_enqueue_device(struct libusb20_backend *pbe, struct libusb20_device *pdev)
1236 {
1237 	pdev->beMethods = pbe->methods;	/* copy backend methods */
1238 	TAILQ_INSERT_TAIL(&(pbe->usb_devs), pdev, dev_entry);
1239 }
1240 
1241 void
1242 libusb20_be_dequeue_device(struct libusb20_backend *pbe,
1243     struct libusb20_device *pdev)
1244 {
1245 	TAILQ_REMOVE(&(pbe->usb_devs), pdev, dev_entry);
1246 }
1247 
1248 const char *
1249 libusb20_strerror(int code)
1250 {
1251 	switch (code) {
1252 	case LIBUSB20_SUCCESS:
1253 		return ("Success");
1254 	case LIBUSB20_ERROR_IO:
1255 		return ("I/O error");
1256 	case LIBUSB20_ERROR_INVALID_PARAM:
1257 		return ("Invalid parameter");
1258 	case LIBUSB20_ERROR_ACCESS:
1259 		return ("Permissions error");
1260 	case LIBUSB20_ERROR_NO_DEVICE:
1261 		return ("No device");
1262 	case LIBUSB20_ERROR_NOT_FOUND:
1263 		return ("Not found");
1264 	case LIBUSB20_ERROR_BUSY:
1265 		return ("Device busy");
1266 	case LIBUSB20_ERROR_TIMEOUT:
1267 		return ("Timeout");
1268 	case LIBUSB20_ERROR_OVERFLOW:
1269 		return ("Overflow");
1270 	case LIBUSB20_ERROR_PIPE:
1271 		return ("Pipe error");
1272 	case LIBUSB20_ERROR_INTERRUPTED:
1273 		return ("Interrupted");
1274 	case LIBUSB20_ERROR_NO_MEM:
1275 		return ("Out of memory");
1276 	case LIBUSB20_ERROR_NOT_SUPPORTED:
1277 		return ("Not supported");
1278 	case LIBUSB20_ERROR_OTHER:
1279 		return ("Other error");
1280 	default:
1281 		return ("Unknown error");
1282 	}
1283 }
1284 
1285 const char *
1286 libusb20_error_name(int code)
1287 {
1288 	switch (code) {
1289 	case LIBUSB20_SUCCESS:
1290 		return ("LIBUSB20_SUCCESS");
1291 	case LIBUSB20_ERROR_IO:
1292 		return ("LIBUSB20_ERROR_IO");
1293 	case LIBUSB20_ERROR_INVALID_PARAM:
1294 		return ("LIBUSB20_ERROR_INVALID_PARAM");
1295 	case LIBUSB20_ERROR_ACCESS:
1296 		return ("LIBUSB20_ERROR_ACCESS");
1297 	case LIBUSB20_ERROR_NO_DEVICE:
1298 		return ("LIBUSB20_ERROR_NO_DEVICE");
1299 	case LIBUSB20_ERROR_NOT_FOUND:
1300 		return ("LIBUSB20_ERROR_NOT_FOUND");
1301 	case LIBUSB20_ERROR_BUSY:
1302 		return ("LIBUSB20_ERROR_BUSY");
1303 	case LIBUSB20_ERROR_TIMEOUT:
1304 		return ("LIBUSB20_ERROR_TIMEOUT");
1305 	case LIBUSB20_ERROR_OVERFLOW:
1306 		return ("LIBUSB20_ERROR_OVERFLOW");
1307 	case LIBUSB20_ERROR_PIPE:
1308 		return ("LIBUSB20_ERROR_PIPE");
1309 	case LIBUSB20_ERROR_INTERRUPTED:
1310 		return ("LIBUSB20_ERROR_INTERRUPTED");
1311 	case LIBUSB20_ERROR_NO_MEM:
1312 		return ("LIBUSB20_ERROR_NO_MEM");
1313 	case LIBUSB20_ERROR_NOT_SUPPORTED:
1314 		return ("LIBUSB20_ERROR_NOT_SUPPORTED");
1315 	case LIBUSB20_ERROR_OTHER:
1316 		return ("LIBUSB20_ERROR_OTHER");
1317 	default:
1318 		return ("LIBUSB20_ERROR_UNKNOWN");
1319 	}
1320 }
1321