1/* $FreeBSD$ */
2/*-
3 * Copyright (c) 2009 Sylvestre Gallon. 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 <errno.h>
31#include <poll.h>
32#include <pthread.h>
33#include <stdio.h>
34#include <stdlib.h>
35#include <string.h>
36#include <time.h>
37#include <unistd.h>
38#include <sys/queue.h>
39#include <sys/endian.h>
40#endif
41
42#define	libusb_device_handle libusb20_device
43
44#include "libusb20.h"
45#include "libusb20_desc.h"
46#include "libusb20_int.h"
47#include "libusb.h"
48#include "libusb10.h"
49
50UNEXPORTED void
51libusb10_add_pollfd(libusb_context *ctx, struct libusb_super_pollfd *pollfd,
52    struct libusb20_device *pdev, int fd, short events)
53{
54	if (ctx == NULL)
55		return;			/* invalid */
56
57	if (pollfd->entry.tqe_prev != NULL)
58		return;			/* already queued */
59
60	if (fd < 0)
61		return;			/* invalid */
62
63	pollfd->pdev = pdev;
64	pollfd->pollfd.fd = fd;
65	pollfd->pollfd.events = events;
66
67	CTX_LOCK(ctx);
68	TAILQ_INSERT_TAIL(&ctx->pollfds, pollfd, entry);
69	CTX_UNLOCK(ctx);
70
71	if (ctx->fd_added_cb)
72		ctx->fd_added_cb(fd, events, ctx->fd_cb_user_data);
73}
74
75UNEXPORTED void
76libusb10_remove_pollfd(libusb_context *ctx, struct libusb_super_pollfd *pollfd)
77{
78	if (ctx == NULL)
79		return;			/* invalid */
80
81	if (pollfd->entry.tqe_prev == NULL)
82		return;			/* already dequeued */
83
84	CTX_LOCK(ctx);
85	TAILQ_REMOVE(&ctx->pollfds, pollfd, entry);
86	pollfd->entry.tqe_prev = NULL;
87	CTX_UNLOCK(ctx);
88
89	if (ctx->fd_removed_cb)
90		ctx->fd_removed_cb(pollfd->pollfd.fd, ctx->fd_cb_user_data);
91}
92
93/* This function must be called locked */
94
95static int
96libusb10_handle_events_sub(struct libusb_context *ctx, struct timeval *tv)
97{
98	struct libusb_device *dev;
99	struct libusb20_device **ppdev;
100	struct libusb_super_pollfd *pfd;
101	struct pollfd *fds;
102	struct libusb_super_transfer *sxfer;
103	struct libusb_transfer *uxfer;
104	nfds_t nfds;
105	int timeout;
106	int i;
107	int err;
108
109	DPRINTF(ctx, LIBUSB_DEBUG_FUNCTION, "libusb10_handle_events_sub enter");
110
111	nfds = 0;
112	i = 0;
113	TAILQ_FOREACH(pfd, &ctx->pollfds, entry)
114	    nfds++;
115
116	fds = alloca(sizeof(*fds) * nfds);
117	if (fds == NULL)
118		return (LIBUSB_ERROR_NO_MEM);
119
120	ppdev = alloca(sizeof(*ppdev) * nfds);
121	if (ppdev == NULL)
122		return (LIBUSB_ERROR_NO_MEM);
123
124	TAILQ_FOREACH(pfd, &ctx->pollfds, entry) {
125		fds[i].fd = pfd->pollfd.fd;
126		fds[i].events = pfd->pollfd.events;
127		fds[i].revents = 0;
128		ppdev[i] = pfd->pdev;
129		if (pfd->pdev != NULL)
130			libusb_get_device(pfd->pdev)->refcnt++;
131		i++;
132	}
133
134	if (tv == NULL)
135		timeout = -1;
136	else
137		timeout = (tv->tv_sec * 1000) + ((tv->tv_usec + 999) / 1000);
138
139	CTX_UNLOCK(ctx);
140	err = poll(fds, nfds, timeout);
141	CTX_LOCK(ctx);
142
143	if ((err == -1) && (errno == EINTR))
144		err = LIBUSB_ERROR_INTERRUPTED;
145	else if (err < 0)
146		err = LIBUSB_ERROR_IO;
147
148	if (err < 1) {
149		for (i = 0; i != (int)nfds; i++) {
150			if (ppdev[i] != NULL) {
151				CTX_UNLOCK(ctx);
152				libusb_unref_device(libusb_get_device(ppdev[i]));
153				CTX_LOCK(ctx);
154			}
155		}
156		goto do_done;
157	}
158	for (i = 0; i != (int)nfds; i++) {
159		if (ppdev[i] != NULL) {
160			dev = libusb_get_device(ppdev[i]);
161
162			if (fds[i].revents == 0)
163				err = 0;	/* nothing to do */
164			else
165				err = libusb20_dev_process(ppdev[i]);
166
167			if (err) {
168				/* cancel all transfers - device is gone */
169				libusb10_cancel_all_transfer(dev);
170
171				/* remove USB device from polling loop */
172				libusb10_remove_pollfd(dev->ctx, &dev->dev_poll);
173			}
174			CTX_UNLOCK(ctx);
175			libusb_unref_device(dev);
176			CTX_LOCK(ctx);
177
178		} else {
179			uint8_t dummy;
180
181			while (1) {
182				if (read(fds[i].fd, &dummy, 1) != 1)
183					break;
184			}
185		}
186	}
187
188	err = 0;
189
190do_done:
191
192	/* Do all done callbacks */
193
194	while ((sxfer = TAILQ_FIRST(&ctx->tr_done))) {
195		uint8_t flags;
196
197		TAILQ_REMOVE(&ctx->tr_done, sxfer, entry);
198		sxfer->entry.tqe_prev = NULL;
199
200		ctx->tr_done_ref++;
201
202		CTX_UNLOCK(ctx);
203
204		uxfer = (struct libusb_transfer *)(
205		    ((uint8_t *)sxfer) + sizeof(*sxfer));
206
207		/* Allow the callback to free the transfer itself. */
208		flags = uxfer->flags;
209
210		if (uxfer->callback != NULL)
211			(uxfer->callback) (uxfer);
212
213		/* Check if the USB transfer should be automatically freed. */
214		if (flags & LIBUSB_TRANSFER_FREE_TRANSFER)
215			libusb_free_transfer(uxfer);
216
217		CTX_LOCK(ctx);
218
219		ctx->tr_done_ref--;
220		ctx->tr_done_gen++;
221	}
222
223	/* Wakeup other waiters */
224	pthread_cond_broadcast(&ctx->ctx_cond);
225
226	return (err);
227}
228
229/* Polling and timing */
230
231int
232libusb_try_lock_events(libusb_context *ctx)
233{
234	int err;
235
236	ctx = GET_CONTEXT(ctx);
237	if (ctx == NULL)
238		return (1);
239
240	err = CTX_TRYLOCK(ctx);
241	if (err)
242		return (1);
243
244	err = (ctx->ctx_handler != NO_THREAD);
245	if (err)
246		CTX_UNLOCK(ctx);
247	else
248		ctx->ctx_handler = pthread_self();
249
250	return (err);
251}
252
253void
254libusb_lock_events(libusb_context *ctx)
255{
256	ctx = GET_CONTEXT(ctx);
257	CTX_LOCK(ctx);
258	if (ctx->ctx_handler == NO_THREAD)
259		ctx->ctx_handler = pthread_self();
260}
261
262void
263libusb_unlock_events(libusb_context *ctx)
264{
265	ctx = GET_CONTEXT(ctx);
266	if (ctx->ctx_handler == pthread_self()) {
267		ctx->ctx_handler = NO_THREAD;
268		pthread_cond_broadcast(&ctx->ctx_cond);
269	}
270	CTX_UNLOCK(ctx);
271}
272
273int
274libusb_event_handling_ok(libusb_context *ctx)
275{
276	ctx = GET_CONTEXT(ctx);
277	return (ctx->ctx_handler == pthread_self());
278}
279
280int
281libusb_event_handler_active(libusb_context *ctx)
282{
283	ctx = GET_CONTEXT(ctx);
284	return (ctx->ctx_handler != NO_THREAD);
285}
286
287void
288libusb_lock_event_waiters(libusb_context *ctx)
289{
290	ctx = GET_CONTEXT(ctx);
291	CTX_LOCK(ctx);
292}
293
294void
295libusb_unlock_event_waiters(libusb_context *ctx)
296{
297	ctx = GET_CONTEXT(ctx);
298	CTX_UNLOCK(ctx);
299}
300
301int
302libusb_wait_for_event(libusb_context *ctx, struct timeval *tv)
303{
304	struct timespec ts;
305	int err;
306
307	ctx = GET_CONTEXT(ctx);
308	DPRINTF(ctx, LIBUSB_DEBUG_FUNCTION, "libusb_wait_for_event enter");
309
310	if (tv == NULL) {
311		pthread_cond_wait(&ctx->ctx_cond,
312		    &ctx->ctx_lock);
313		return (0);
314	}
315	err = clock_gettime(CLOCK_MONOTONIC, &ts);
316	if (err < 0)
317		return (LIBUSB_ERROR_OTHER);
318
319	/*
320	 * The "tv" arguments points to a relative time structure and
321	 * not an absolute time structure.
322	 */
323	ts.tv_sec += tv->tv_sec;
324	ts.tv_nsec += tv->tv_usec * 1000;
325	if (ts.tv_nsec >= 1000000000) {
326		ts.tv_nsec -= 1000000000;
327		ts.tv_sec++;
328	}
329	err = pthread_cond_timedwait(&ctx->ctx_cond,
330	    &ctx->ctx_lock, &ts);
331
332	if (err == ETIMEDOUT)
333		return (1);
334
335	return (0);
336}
337
338int
339libusb_handle_events_timeout_completed(libusb_context *ctx,
340    struct timeval *tv, int *completed)
341{
342	int err = 0;
343
344	ctx = GET_CONTEXT(ctx);
345
346	DPRINTF(ctx, LIBUSB_DEBUG_FUNCTION, "libusb_handle_events_timeout_completed enter");
347
348	libusb_lock_events(ctx);
349
350	while (1) {
351		if (completed != NULL) {
352			if (*completed != 0 || err != 0)
353				break;
354		}
355		err = libusb_handle_events_locked(ctx, tv);
356		if (completed == NULL)
357			break;
358	}
359
360	libusb_unlock_events(ctx);
361
362	DPRINTF(ctx, LIBUSB_DEBUG_FUNCTION, "libusb_handle_events_timeout_completed exit");
363
364	return (err);
365}
366
367int
368libusb_handle_events_completed(libusb_context *ctx, int *completed)
369{
370	return (libusb_handle_events_timeout_completed(ctx, NULL, completed));
371}
372
373int
374libusb_handle_events_timeout(libusb_context *ctx, struct timeval *tv)
375{
376	return (libusb_handle_events_timeout_completed(ctx, tv, NULL));
377}
378
379int
380libusb_handle_events(libusb_context *ctx)
381{
382	return (libusb_handle_events_timeout_completed(ctx, NULL, NULL));
383}
384
385int
386libusb_handle_events_locked(libusb_context *ctx, struct timeval *tv)
387{
388	int err;
389
390	ctx = GET_CONTEXT(ctx);
391
392	if (libusb_event_handling_ok(ctx)) {
393		err = libusb10_handle_events_sub(ctx, tv);
394	} else {
395		err = libusb_wait_for_event(ctx, tv);
396		if (err != 0)
397			err = LIBUSB_ERROR_TIMEOUT;
398	}
399	return (err);
400}
401
402int
403libusb_get_next_timeout(libusb_context *ctx, struct timeval *tv)
404{
405	/* all timeouts are currently being done by the kernel */
406	timerclear(tv);
407	return (0);
408}
409
410void
411libusb_set_pollfd_notifiers(libusb_context *ctx,
412    libusb_pollfd_added_cb added_cb, libusb_pollfd_removed_cb removed_cb,
413    void *user_data)
414{
415	ctx = GET_CONTEXT(ctx);
416
417	ctx->fd_added_cb = added_cb;
418	ctx->fd_removed_cb = removed_cb;
419	ctx->fd_cb_user_data = user_data;
420}
421
422const struct libusb_pollfd **
423libusb_get_pollfds(libusb_context *ctx)
424{
425	struct libusb_super_pollfd *pollfd;
426	libusb_pollfd **ret;
427	int i;
428
429	ctx = GET_CONTEXT(ctx);
430
431	CTX_LOCK(ctx);
432
433	i = 0;
434	TAILQ_FOREACH(pollfd, &ctx->pollfds, entry)
435	    i++;
436
437	ret = calloc(i + 1, sizeof(struct libusb_pollfd *));
438	if (ret == NULL)
439		goto done;
440
441	i = 0;
442	TAILQ_FOREACH(pollfd, &ctx->pollfds, entry)
443	    ret[i++] = &pollfd->pollfd;
444	ret[i] = NULL;
445
446done:
447	CTX_UNLOCK(ctx);
448	return ((const struct libusb_pollfd **)ret);
449}
450
451
452/* Synchronous device I/O */
453
454int
455libusb_control_transfer(libusb_device_handle *devh,
456    uint8_t bmRequestType, uint8_t bRequest, uint16_t wValue, uint16_t wIndex,
457    uint8_t *data, uint16_t wLength, unsigned int timeout)
458{
459	struct LIBUSB20_CONTROL_SETUP_DECODED req;
460	int err;
461	uint16_t actlen;
462
463	if (devh == NULL)
464		return (LIBUSB_ERROR_INVALID_PARAM);
465
466	if ((wLength != 0) && (data == NULL))
467		return (LIBUSB_ERROR_INVALID_PARAM);
468
469	LIBUSB20_INIT(LIBUSB20_CONTROL_SETUP, &req);
470
471	req.bmRequestType = bmRequestType;
472	req.bRequest = bRequest;
473	req.wValue = wValue;
474	req.wIndex = wIndex;
475	req.wLength = wLength;
476
477	err = libusb20_dev_request_sync(devh, &req, data,
478	    &actlen, timeout, 0);
479
480	if (err == LIBUSB20_ERROR_PIPE)
481		return (LIBUSB_ERROR_PIPE);
482	else if (err == LIBUSB20_ERROR_TIMEOUT)
483		return (LIBUSB_ERROR_TIMEOUT);
484	else if (err)
485		return (LIBUSB_ERROR_NO_DEVICE);
486
487	return (actlen);
488}
489
490static void
491libusb10_do_transfer_cb(struct libusb_transfer *transfer)
492{
493	libusb_context *ctx;
494	int *pdone;
495
496	ctx = GET_CONTEXT(NULL);
497
498	DPRINTF(ctx, LIBUSB_DEBUG_TRANSFER, "sync I/O done");
499
500	pdone = transfer->user_data;
501	*pdone = 1;
502}
503
504/*
505 * TODO: Replace the following function. Allocating and freeing on a
506 * per-transfer basis is slow.  --HPS
507 */
508static int
509libusb10_do_transfer(libusb_device_handle *devh,
510    uint8_t endpoint, uint8_t *data, int length,
511    int *transferred, unsigned int timeout, int type)
512{
513	libusb_context *ctx;
514	struct libusb_transfer *xfer;
515	int done;
516	int ret;
517
518	if (devh == NULL)
519		return (LIBUSB_ERROR_INVALID_PARAM);
520
521	if ((length != 0) && (data == NULL))
522		return (LIBUSB_ERROR_INVALID_PARAM);
523
524	xfer = libusb_alloc_transfer(0);
525	if (xfer == NULL)
526		return (LIBUSB_ERROR_NO_MEM);
527
528	ctx = libusb_get_device(devh)->ctx;
529
530	xfer->dev_handle = devh;
531	xfer->endpoint = endpoint;
532	xfer->type = type;
533	xfer->timeout = timeout;
534	xfer->buffer = data;
535	xfer->length = length;
536	xfer->user_data = (void *)&done;
537	xfer->callback = libusb10_do_transfer_cb;
538	done = 0;
539
540	if ((ret = libusb_submit_transfer(xfer)) < 0) {
541		libusb_free_transfer(xfer);
542		return (ret);
543	}
544	while (done == 0) {
545		if ((ret = libusb_handle_events(ctx)) < 0) {
546			libusb_cancel_transfer(xfer);
547			usleep(1000);	/* nice it */
548		}
549	}
550
551	*transferred = xfer->actual_length;
552
553	switch (xfer->status) {
554	case LIBUSB_TRANSFER_COMPLETED:
555		ret = 0;
556		break;
557	case LIBUSB_TRANSFER_TIMED_OUT:
558		ret = LIBUSB_ERROR_TIMEOUT;
559		break;
560	case LIBUSB_TRANSFER_OVERFLOW:
561		ret = LIBUSB_ERROR_OVERFLOW;
562		break;
563	case LIBUSB_TRANSFER_STALL:
564		ret = LIBUSB_ERROR_PIPE;
565		break;
566	case LIBUSB_TRANSFER_NO_DEVICE:
567		ret = LIBUSB_ERROR_NO_DEVICE;
568		break;
569	default:
570		ret = LIBUSB_ERROR_OTHER;
571		break;
572	}
573
574	libusb_free_transfer(xfer);
575	return (ret);
576}
577
578int
579libusb_bulk_transfer(libusb_device_handle *devh,
580    uint8_t endpoint, uint8_t *data, int length,
581    int *transferred, unsigned int timeout)
582{
583	libusb_context *ctx;
584	int ret;
585
586	ctx = GET_CONTEXT(NULL);
587	DPRINTF(ctx, LIBUSB_DEBUG_FUNCTION, "libusb_bulk_transfer enter");
588
589	ret = libusb10_do_transfer(devh, endpoint, data, length, transferred,
590	    timeout, LIBUSB_TRANSFER_TYPE_BULK);
591
592	DPRINTF(ctx, LIBUSB_DEBUG_FUNCTION, "libusb_bulk_transfer leave");
593	return (ret);
594}
595
596int
597libusb_interrupt_transfer(libusb_device_handle *devh,
598    uint8_t endpoint, uint8_t *data, int length,
599    int *transferred, unsigned int timeout)
600{
601	libusb_context *ctx;
602	int ret;
603
604	ctx = GET_CONTEXT(NULL);
605	DPRINTF(ctx, LIBUSB_DEBUG_FUNCTION, "libusb_interrupt_transfer enter");
606
607	ret = libusb10_do_transfer(devh, endpoint, data, length, transferred,
608	    timeout, LIBUSB_TRANSFER_TYPE_INTERRUPT);
609
610	DPRINTF(ctx, LIBUSB_DEBUG_FUNCTION, "libusb_interrupt_transfer leave");
611	return (ret);
612}
613
614uint8_t *
615libusb_get_iso_packet_buffer(struct libusb_transfer *transfer, uint32_t off)
616{
617	uint8_t *ptr;
618	uint32_t n;
619
620	if (transfer->num_iso_packets < 0)
621		return (NULL);
622
623	if (off >= (uint32_t)transfer->num_iso_packets)
624		return (NULL);
625
626	ptr = transfer->buffer;
627	if (ptr == NULL)
628		return (NULL);
629
630	for (n = 0; n != off; n++) {
631		ptr += transfer->iso_packet_desc[n].length;
632	}
633	return (ptr);
634}
635
636uint8_t *
637libusb_get_iso_packet_buffer_simple(struct libusb_transfer *transfer, uint32_t off)
638{
639	uint8_t *ptr;
640
641	if (transfer->num_iso_packets < 0)
642		return (NULL);
643
644	if (off >= (uint32_t)transfer->num_iso_packets)
645		return (NULL);
646
647	ptr = transfer->buffer;
648	if (ptr == NULL)
649		return (NULL);
650
651	ptr += transfer->iso_packet_desc[0].length * off;
652
653	return (ptr);
654}
655
656void
657libusb_set_iso_packet_lengths(struct libusb_transfer *transfer, uint32_t length)
658{
659	int n;
660
661	if (transfer->num_iso_packets < 0)
662		return;
663
664	for (n = 0; n != transfer->num_iso_packets; n++)
665		transfer->iso_packet_desc[n].length = length;
666}
667
668uint8_t *
669libusb_control_transfer_get_data(struct libusb_transfer *transfer)
670{
671	if (transfer->buffer == NULL)
672		return (NULL);
673
674	return (transfer->buffer + LIBUSB_CONTROL_SETUP_SIZE);
675}
676
677struct libusb_control_setup *
678libusb_control_transfer_get_setup(struct libusb_transfer *transfer)
679{
680	return ((struct libusb_control_setup *)transfer->buffer);
681}
682
683void
684libusb_fill_control_setup(uint8_t *buf, uint8_t bmRequestType,
685    uint8_t bRequest, uint16_t wValue,
686    uint16_t wIndex, uint16_t wLength)
687{
688	struct libusb_control_setup *req = (struct libusb_control_setup *)buf;
689
690	/* The alignment is OK for all fields below. */
691	req->bmRequestType = bmRequestType;
692	req->bRequest = bRequest;
693	req->wValue = htole16(wValue);
694	req->wIndex = htole16(wIndex);
695	req->wLength = htole16(wLength);
696}
697
698void
699libusb_fill_control_transfer(struct libusb_transfer *transfer,
700    libusb_device_handle *devh, uint8_t *buf,
701    libusb_transfer_cb_fn callback, void *user_data,
702    uint32_t timeout)
703{
704	struct libusb_control_setup *setup = (struct libusb_control_setup *)buf;
705
706	transfer->dev_handle = devh;
707	transfer->endpoint = 0;
708	transfer->type = LIBUSB_TRANSFER_TYPE_CONTROL;
709	transfer->timeout = timeout;
710	transfer->buffer = buf;
711	if (setup != NULL)
712		transfer->length = LIBUSB_CONTROL_SETUP_SIZE
713			+ le16toh(setup->wLength);
714	else
715		transfer->length = 0;
716	transfer->user_data = user_data;
717	transfer->callback = callback;
718
719}
720
721void
722libusb_fill_bulk_transfer(struct libusb_transfer *transfer,
723    libusb_device_handle *devh, uint8_t endpoint, uint8_t *buf,
724    int length, libusb_transfer_cb_fn callback, void *user_data,
725    uint32_t timeout)
726{
727	transfer->dev_handle = devh;
728	transfer->endpoint = endpoint;
729	transfer->type = LIBUSB_TRANSFER_TYPE_BULK;
730	transfer->timeout = timeout;
731	transfer->buffer = buf;
732	transfer->length = length;
733	transfer->user_data = user_data;
734	transfer->callback = callback;
735}
736
737void
738libusb_fill_interrupt_transfer(struct libusb_transfer *transfer,
739    libusb_device_handle *devh, uint8_t endpoint, uint8_t *buf,
740    int length, libusb_transfer_cb_fn callback, void *user_data,
741    uint32_t timeout)
742{
743	transfer->dev_handle = devh;
744	transfer->endpoint = endpoint;
745	transfer->type = LIBUSB_TRANSFER_TYPE_INTERRUPT;
746	transfer->timeout = timeout;
747	transfer->buffer = buf;
748	transfer->length = length;
749	transfer->user_data = user_data;
750	transfer->callback = callback;
751}
752
753void
754libusb_fill_iso_transfer(struct libusb_transfer *transfer,
755    libusb_device_handle *devh, uint8_t endpoint, uint8_t *buf,
756    int length, int npacket, libusb_transfer_cb_fn callback,
757    void *user_data, uint32_t timeout)
758{
759	transfer->dev_handle = devh;
760	transfer->endpoint = endpoint;
761	transfer->type = LIBUSB_TRANSFER_TYPE_ISOCHRONOUS;
762	transfer->timeout = timeout;
763	transfer->buffer = buf;
764	transfer->length = length;
765	transfer->num_iso_packets = npacket;
766	transfer->user_data = user_data;
767	transfer->callback = callback;
768}
769
770