540c72297d
been detached. When a USB device has been detached the kernel file handle stops responding to commands. USB applications which continue to run after the USB device has been detached, depend on LibUSB generated events to tear down its pending USB transfers. Add code to handle the needed cleanup when processing the USB transfer(s) fails and prevent new USB transfer(s) from being submitted. Found by: Ludovic Rousseau <ludovic.rousseau+freebsd@gmail.com> PR: 231076 MFC after: 1 week Approved by: re (gjb) Sponsored by: Mellanox Technologies
817 lines
18 KiB
C
817 lines
18 KiB
C
/* $FreeBSD$ */
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/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2009 Sylvestre Gallon. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifdef LIBUSB_GLOBAL_INCLUDE_FILE
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#include LIBUSB_GLOBAL_INCLUDE_FILE
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#else
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#include <errno.h>
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#include <poll.h>
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#include <pthread.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <unistd.h>
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#include <sys/queue.h>
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#include <sys/endian.h>
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#endif
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#define libusb_device_handle libusb20_device
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#include "libusb20.h"
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#include "libusb20_desc.h"
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#include "libusb20_int.h"
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#include "libusb.h"
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#include "libusb10.h"
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UNEXPORTED void
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libusb10_add_pollfd(libusb_context *ctx, struct libusb_super_pollfd *pollfd,
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struct libusb20_device *pdev, int fd, short events)
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{
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if (ctx == NULL)
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return; /* invalid */
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if (pollfd->entry.tqe_prev != NULL)
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return; /* already queued */
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if (fd < 0)
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return; /* invalid */
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pollfd->pdev = pdev;
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pollfd->pollfd.fd = fd;
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pollfd->pollfd.events = events;
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CTX_LOCK(ctx);
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TAILQ_INSERT_TAIL(&ctx->pollfds, pollfd, entry);
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CTX_UNLOCK(ctx);
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if (ctx->fd_added_cb)
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ctx->fd_added_cb(fd, events, ctx->fd_cb_user_data);
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}
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UNEXPORTED void
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libusb10_remove_pollfd(libusb_context *ctx, struct libusb_super_pollfd *pollfd)
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{
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if (ctx == NULL)
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return; /* invalid */
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if (pollfd->entry.tqe_prev == NULL)
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return; /* already dequeued */
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CTX_LOCK(ctx);
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TAILQ_REMOVE(&ctx->pollfds, pollfd, entry);
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pollfd->entry.tqe_prev = NULL;
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CTX_UNLOCK(ctx);
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if (ctx->fd_removed_cb)
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ctx->fd_removed_cb(pollfd->pollfd.fd, ctx->fd_cb_user_data);
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}
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/* This function must be called locked */
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static int
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libusb10_handle_events_sub(struct libusb_context *ctx, struct timeval *tv)
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{
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struct libusb_device *dev;
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struct libusb20_device **ppdev;
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struct libusb_super_pollfd *pfd;
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struct pollfd *fds;
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struct libusb_super_transfer *sxfer;
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struct libusb_transfer *uxfer;
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nfds_t nfds;
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int timeout;
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int i;
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int err;
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DPRINTF(ctx, LIBUSB_DEBUG_FUNCTION, "libusb10_handle_events_sub enter");
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nfds = 0;
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i = 0;
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TAILQ_FOREACH(pfd, &ctx->pollfds, entry)
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nfds++;
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fds = alloca(sizeof(*fds) * nfds);
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if (fds == NULL)
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return (LIBUSB_ERROR_NO_MEM);
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ppdev = alloca(sizeof(*ppdev) * nfds);
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if (ppdev == NULL)
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return (LIBUSB_ERROR_NO_MEM);
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TAILQ_FOREACH(pfd, &ctx->pollfds, entry) {
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fds[i].fd = pfd->pollfd.fd;
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fds[i].events = pfd->pollfd.events;
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fds[i].revents = 0;
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ppdev[i] = pfd->pdev;
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if (pfd->pdev != NULL)
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libusb_get_device(pfd->pdev)->refcnt++;
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i++;
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}
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if (tv == NULL)
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timeout = -1;
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else
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timeout = (tv->tv_sec * 1000) + ((tv->tv_usec + 999) / 1000);
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CTX_UNLOCK(ctx);
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err = poll(fds, nfds, timeout);
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CTX_LOCK(ctx);
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if ((err == -1) && (errno == EINTR))
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err = LIBUSB_ERROR_INTERRUPTED;
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else if (err < 0)
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err = LIBUSB_ERROR_IO;
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if (err < 1) {
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for (i = 0; i != (int)nfds; i++) {
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if (ppdev[i] != NULL) {
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CTX_UNLOCK(ctx);
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libusb_unref_device(libusb_get_device(ppdev[i]));
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CTX_LOCK(ctx);
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}
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}
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goto do_done;
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}
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for (i = 0; i != (int)nfds; i++) {
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if (ppdev[i] != NULL) {
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dev = libusb_get_device(ppdev[i]);
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if (fds[i].revents != 0) {
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err = libusb20_dev_process(ppdev[i]);
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if (err) {
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/* set device is gone */
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dev->device_is_gone = 1;
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/* remove USB device from polling loop */
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libusb10_remove_pollfd(dev->ctx, &dev->dev_poll);
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/* cancel all pending transfers */
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libusb10_cancel_all_transfer_locked(ppdev[i], dev);
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}
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}
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CTX_UNLOCK(ctx);
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libusb_unref_device(dev);
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CTX_LOCK(ctx);
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} else {
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uint8_t dummy;
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while (read(fds[i].fd, &dummy, 1) == 1)
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;
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}
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}
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err = 0;
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do_done:
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/* Do all done callbacks */
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while ((sxfer = TAILQ_FIRST(&ctx->tr_done))) {
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uint8_t flags;
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TAILQ_REMOVE(&ctx->tr_done, sxfer, entry);
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sxfer->entry.tqe_prev = NULL;
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ctx->tr_done_ref++;
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CTX_UNLOCK(ctx);
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uxfer = (struct libusb_transfer *)(
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((uint8_t *)sxfer) + sizeof(*sxfer));
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/* Allow the callback to free the transfer itself. */
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flags = uxfer->flags;
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if (uxfer->callback != NULL)
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(uxfer->callback) (uxfer);
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/* Check if the USB transfer should be automatically freed. */
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if (flags & LIBUSB_TRANSFER_FREE_TRANSFER)
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libusb_free_transfer(uxfer);
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CTX_LOCK(ctx);
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ctx->tr_done_ref--;
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ctx->tr_done_gen++;
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}
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/* Wakeup other waiters */
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pthread_cond_broadcast(&ctx->ctx_cond);
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return (err);
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}
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/* Polling and timing */
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int
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libusb_try_lock_events(libusb_context *ctx)
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{
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int err;
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ctx = GET_CONTEXT(ctx);
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if (ctx == NULL)
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return (1);
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err = CTX_TRYLOCK(ctx);
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if (err)
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return (1);
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err = (ctx->ctx_handler != NO_THREAD);
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if (err)
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CTX_UNLOCK(ctx);
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else
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ctx->ctx_handler = pthread_self();
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return (err);
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}
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void
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libusb_lock_events(libusb_context *ctx)
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{
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ctx = GET_CONTEXT(ctx);
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CTX_LOCK(ctx);
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if (ctx->ctx_handler == NO_THREAD)
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ctx->ctx_handler = pthread_self();
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}
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void
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libusb_unlock_events(libusb_context *ctx)
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{
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ctx = GET_CONTEXT(ctx);
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if (ctx->ctx_handler == pthread_self()) {
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ctx->ctx_handler = NO_THREAD;
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pthread_cond_broadcast(&ctx->ctx_cond);
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}
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CTX_UNLOCK(ctx);
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}
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int
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libusb_event_handling_ok(libusb_context *ctx)
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{
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ctx = GET_CONTEXT(ctx);
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return (ctx->ctx_handler == pthread_self());
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}
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int
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libusb_event_handler_active(libusb_context *ctx)
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{
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ctx = GET_CONTEXT(ctx);
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return (ctx->ctx_handler != NO_THREAD);
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}
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void
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libusb_lock_event_waiters(libusb_context *ctx)
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{
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ctx = GET_CONTEXT(ctx);
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CTX_LOCK(ctx);
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}
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void
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libusb_unlock_event_waiters(libusb_context *ctx)
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{
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ctx = GET_CONTEXT(ctx);
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CTX_UNLOCK(ctx);
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}
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int
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libusb_wait_for_event(libusb_context *ctx, struct timeval *tv)
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{
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struct timespec ts;
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int err;
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ctx = GET_CONTEXT(ctx);
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DPRINTF(ctx, LIBUSB_DEBUG_FUNCTION, "libusb_wait_for_event enter");
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if (tv == NULL) {
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pthread_cond_wait(&ctx->ctx_cond,
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&ctx->ctx_lock);
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return (0);
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}
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err = clock_gettime(CLOCK_MONOTONIC, &ts);
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if (err < 0)
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return (LIBUSB_ERROR_OTHER);
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/*
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* The "tv" arguments points to a relative time structure and
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* not an absolute time structure.
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*/
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ts.tv_sec += tv->tv_sec;
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ts.tv_nsec += tv->tv_usec * 1000;
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if (ts.tv_nsec >= 1000000000) {
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ts.tv_nsec -= 1000000000;
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ts.tv_sec++;
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}
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err = pthread_cond_timedwait(&ctx->ctx_cond,
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&ctx->ctx_lock, &ts);
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if (err == ETIMEDOUT)
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return (1);
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return (0);
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}
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int
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libusb_handle_events_timeout_completed(libusb_context *ctx,
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struct timeval *tv, int *completed)
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{
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int err = 0;
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ctx = GET_CONTEXT(ctx);
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DPRINTF(ctx, LIBUSB_DEBUG_FUNCTION, "libusb_handle_events_timeout_completed enter");
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libusb_lock_events(ctx);
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while (1) {
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if (completed != NULL) {
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if (*completed != 0 || err != 0)
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break;
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}
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err = libusb_handle_events_locked(ctx, tv);
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if (completed == NULL)
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break;
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}
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libusb_unlock_events(ctx);
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DPRINTF(ctx, LIBUSB_DEBUG_FUNCTION, "libusb_handle_events_timeout_completed exit");
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return (err);
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}
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int
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libusb_handle_events_completed(libusb_context *ctx, int *completed)
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{
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return (libusb_handle_events_timeout_completed(ctx, NULL, completed));
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}
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int
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libusb_handle_events_timeout(libusb_context *ctx, struct timeval *tv)
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{
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return (libusb_handle_events_timeout_completed(ctx, tv, NULL));
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}
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int
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libusb_handle_events(libusb_context *ctx)
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{
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return (libusb_handle_events_timeout_completed(ctx, NULL, NULL));
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}
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int
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libusb_handle_events_locked(libusb_context *ctx, struct timeval *tv)
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{
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int err;
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ctx = GET_CONTEXT(ctx);
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if (libusb_event_handling_ok(ctx)) {
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err = libusb10_handle_events_sub(ctx, tv);
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} else {
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err = libusb_wait_for_event(ctx, tv);
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if (err != 0)
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err = LIBUSB_ERROR_TIMEOUT;
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}
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return (err);
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}
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int
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libusb_get_next_timeout(libusb_context *ctx, struct timeval *tv)
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{
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/* all timeouts are currently being done by the kernel */
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timerclear(tv);
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return (0);
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}
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void
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libusb_set_pollfd_notifiers(libusb_context *ctx,
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libusb_pollfd_added_cb added_cb, libusb_pollfd_removed_cb removed_cb,
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void *user_data)
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{
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ctx = GET_CONTEXT(ctx);
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ctx->fd_added_cb = added_cb;
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ctx->fd_removed_cb = removed_cb;
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ctx->fd_cb_user_data = user_data;
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}
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const struct libusb_pollfd **
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libusb_get_pollfds(libusb_context *ctx)
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{
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struct libusb_super_pollfd *pollfd;
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libusb_pollfd **ret;
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int i;
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ctx = GET_CONTEXT(ctx);
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CTX_LOCK(ctx);
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i = 0;
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TAILQ_FOREACH(pollfd, &ctx->pollfds, entry)
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i++;
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ret = calloc(i + 1, sizeof(struct libusb_pollfd *));
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if (ret == NULL)
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goto done;
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i = 0;
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TAILQ_FOREACH(pollfd, &ctx->pollfds, entry)
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ret[i++] = &pollfd->pollfd;
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ret[i] = NULL;
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done:
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CTX_UNLOCK(ctx);
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return ((const struct libusb_pollfd **)ret);
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}
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/* Synchronous device I/O */
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int
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libusb_control_transfer(libusb_device_handle *devh,
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uint8_t bmRequestType, uint8_t bRequest, uint16_t wValue, uint16_t wIndex,
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uint8_t *data, uint16_t wLength, unsigned int timeout)
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{
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struct LIBUSB20_CONTROL_SETUP_DECODED req;
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int err;
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uint16_t actlen;
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if (devh == NULL)
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return (LIBUSB_ERROR_INVALID_PARAM);
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if ((wLength != 0) && (data == NULL))
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return (LIBUSB_ERROR_INVALID_PARAM);
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LIBUSB20_INIT(LIBUSB20_CONTROL_SETUP, &req);
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req.bmRequestType = bmRequestType;
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req.bRequest = bRequest;
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req.wValue = wValue;
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req.wIndex = wIndex;
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req.wLength = wLength;
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err = libusb20_dev_request_sync(devh, &req, data,
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&actlen, timeout, 0);
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if (err == LIBUSB20_ERROR_PIPE)
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return (LIBUSB_ERROR_PIPE);
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else if (err == LIBUSB20_ERROR_TIMEOUT)
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return (LIBUSB_ERROR_TIMEOUT);
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else if (err)
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return (LIBUSB_ERROR_NO_DEVICE);
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return (actlen);
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}
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static void
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libusb10_do_transfer_cb(struct libusb_transfer *transfer)
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{
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libusb_context *ctx;
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int *pdone;
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ctx = GET_CONTEXT(NULL);
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DPRINTF(ctx, LIBUSB_DEBUG_TRANSFER, "sync I/O done");
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pdone = transfer->user_data;
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*pdone = 1;
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}
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/*
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* TODO: Replace the following function. Allocating and freeing on a
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* per-transfer basis is slow. --HPS
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*/
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static int
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libusb10_do_transfer(libusb_device_handle *devh,
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uint8_t endpoint, uint8_t *data, int length,
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int *transferred, unsigned int timeout, int type)
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{
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libusb_context *ctx;
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struct libusb_transfer *xfer;
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int done;
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int ret;
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if (devh == NULL)
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return (LIBUSB_ERROR_INVALID_PARAM);
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if ((length != 0) && (data == NULL))
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return (LIBUSB_ERROR_INVALID_PARAM);
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xfer = libusb_alloc_transfer(0);
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if (xfer == NULL)
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return (LIBUSB_ERROR_NO_MEM);
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ctx = libusb_get_device(devh)->ctx;
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xfer->dev_handle = devh;
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xfer->endpoint = endpoint;
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xfer->type = type;
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xfer->timeout = timeout;
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xfer->buffer = data;
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xfer->length = length;
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xfer->user_data = (void *)&done;
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xfer->callback = libusb10_do_transfer_cb;
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done = 0;
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if ((ret = libusb_submit_transfer(xfer)) < 0) {
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libusb_free_transfer(xfer);
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return (ret);
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}
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while (done == 0) {
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if ((ret = libusb_handle_events(ctx)) < 0) {
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libusb_cancel_transfer(xfer);
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usleep(1000); /* nice it */
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}
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}
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|
|
*transferred = xfer->actual_length;
|
|
|
|
switch (xfer->status) {
|
|
case LIBUSB_TRANSFER_COMPLETED:
|
|
ret = 0;
|
|
break;
|
|
case LIBUSB_TRANSFER_TIMED_OUT:
|
|
ret = LIBUSB_ERROR_TIMEOUT;
|
|
break;
|
|
case LIBUSB_TRANSFER_OVERFLOW:
|
|
ret = LIBUSB_ERROR_OVERFLOW;
|
|
break;
|
|
case LIBUSB_TRANSFER_STALL:
|
|
ret = LIBUSB_ERROR_PIPE;
|
|
break;
|
|
case LIBUSB_TRANSFER_NO_DEVICE:
|
|
ret = LIBUSB_ERROR_NO_DEVICE;
|
|
break;
|
|
default:
|
|
ret = LIBUSB_ERROR_OTHER;
|
|
break;
|
|
}
|
|
|
|
libusb_free_transfer(xfer);
|
|
return (ret);
|
|
}
|
|
|
|
int
|
|
libusb_bulk_transfer(libusb_device_handle *devh,
|
|
uint8_t endpoint, uint8_t *data, int length,
|
|
int *transferred, unsigned int timeout)
|
|
{
|
|
libusb_context *ctx;
|
|
int ret;
|
|
|
|
ctx = GET_CONTEXT(NULL);
|
|
DPRINTF(ctx, LIBUSB_DEBUG_FUNCTION, "libusb_bulk_transfer enter");
|
|
|
|
ret = libusb10_do_transfer(devh, endpoint, data, length, transferred,
|
|
timeout, LIBUSB_TRANSFER_TYPE_BULK);
|
|
|
|
DPRINTF(ctx, LIBUSB_DEBUG_FUNCTION, "libusb_bulk_transfer leave");
|
|
return (ret);
|
|
}
|
|
|
|
int
|
|
libusb_interrupt_transfer(libusb_device_handle *devh,
|
|
uint8_t endpoint, uint8_t *data, int length,
|
|
int *transferred, unsigned int timeout)
|
|
{
|
|
libusb_context *ctx;
|
|
int ret;
|
|
|
|
ctx = GET_CONTEXT(NULL);
|
|
DPRINTF(ctx, LIBUSB_DEBUG_FUNCTION, "libusb_interrupt_transfer enter");
|
|
|
|
ret = libusb10_do_transfer(devh, endpoint, data, length, transferred,
|
|
timeout, LIBUSB_TRANSFER_TYPE_INTERRUPT);
|
|
|
|
DPRINTF(ctx, LIBUSB_DEBUG_FUNCTION, "libusb_interrupt_transfer leave");
|
|
return (ret);
|
|
}
|
|
|
|
uint8_t *
|
|
libusb_get_iso_packet_buffer(struct libusb_transfer *transfer, uint32_t off)
|
|
{
|
|
uint8_t *ptr;
|
|
uint32_t n;
|
|
|
|
if (transfer->num_iso_packets < 0)
|
|
return (NULL);
|
|
|
|
if (off >= (uint32_t)transfer->num_iso_packets)
|
|
return (NULL);
|
|
|
|
ptr = transfer->buffer;
|
|
if (ptr == NULL)
|
|
return (NULL);
|
|
|
|
for (n = 0; n != off; n++) {
|
|
ptr += transfer->iso_packet_desc[n].length;
|
|
}
|
|
return (ptr);
|
|
}
|
|
|
|
uint8_t *
|
|
libusb_get_iso_packet_buffer_simple(struct libusb_transfer *transfer, uint32_t off)
|
|
{
|
|
uint8_t *ptr;
|
|
|
|
if (transfer->num_iso_packets < 0)
|
|
return (NULL);
|
|
|
|
if (off >= (uint32_t)transfer->num_iso_packets)
|
|
return (NULL);
|
|
|
|
ptr = transfer->buffer;
|
|
if (ptr == NULL)
|
|
return (NULL);
|
|
|
|
ptr += transfer->iso_packet_desc[0].length * off;
|
|
|
|
return (ptr);
|
|
}
|
|
|
|
void
|
|
libusb_set_iso_packet_lengths(struct libusb_transfer *transfer, uint32_t length)
|
|
{
|
|
int n;
|
|
|
|
if (transfer->num_iso_packets < 0)
|
|
return;
|
|
|
|
for (n = 0; n != transfer->num_iso_packets; n++)
|
|
transfer->iso_packet_desc[n].length = length;
|
|
}
|
|
|
|
uint8_t *
|
|
libusb_control_transfer_get_data(struct libusb_transfer *transfer)
|
|
{
|
|
if (transfer->buffer == NULL)
|
|
return (NULL);
|
|
|
|
return (transfer->buffer + LIBUSB_CONTROL_SETUP_SIZE);
|
|
}
|
|
|
|
struct libusb_control_setup *
|
|
libusb_control_transfer_get_setup(struct libusb_transfer *transfer)
|
|
{
|
|
return ((struct libusb_control_setup *)transfer->buffer);
|
|
}
|
|
|
|
void
|
|
libusb_fill_control_setup(uint8_t *buf, uint8_t bmRequestType,
|
|
uint8_t bRequest, uint16_t wValue,
|
|
uint16_t wIndex, uint16_t wLength)
|
|
{
|
|
struct libusb_control_setup *req = (struct libusb_control_setup *)buf;
|
|
|
|
/* The alignment is OK for all fields below. */
|
|
req->bmRequestType = bmRequestType;
|
|
req->bRequest = bRequest;
|
|
req->wValue = htole16(wValue);
|
|
req->wIndex = htole16(wIndex);
|
|
req->wLength = htole16(wLength);
|
|
}
|
|
|
|
void
|
|
libusb_fill_control_transfer(struct libusb_transfer *transfer,
|
|
libusb_device_handle *devh, uint8_t *buf,
|
|
libusb_transfer_cb_fn callback, void *user_data,
|
|
uint32_t timeout)
|
|
{
|
|
struct libusb_control_setup *setup = (struct libusb_control_setup *)buf;
|
|
|
|
transfer->dev_handle = devh;
|
|
transfer->endpoint = 0;
|
|
transfer->type = LIBUSB_TRANSFER_TYPE_CONTROL;
|
|
transfer->timeout = timeout;
|
|
transfer->buffer = buf;
|
|
if (setup != NULL)
|
|
transfer->length = LIBUSB_CONTROL_SETUP_SIZE
|
|
+ le16toh(setup->wLength);
|
|
else
|
|
transfer->length = 0;
|
|
transfer->user_data = user_data;
|
|
transfer->callback = callback;
|
|
|
|
}
|
|
|
|
void
|
|
libusb_fill_bulk_transfer(struct libusb_transfer *transfer,
|
|
libusb_device_handle *devh, uint8_t endpoint, uint8_t *buf,
|
|
int length, libusb_transfer_cb_fn callback, void *user_data,
|
|
uint32_t timeout)
|
|
{
|
|
transfer->dev_handle = devh;
|
|
transfer->endpoint = endpoint;
|
|
transfer->type = LIBUSB_TRANSFER_TYPE_BULK;
|
|
transfer->timeout = timeout;
|
|
transfer->buffer = buf;
|
|
transfer->length = length;
|
|
transfer->user_data = user_data;
|
|
transfer->callback = callback;
|
|
}
|
|
|
|
void
|
|
libusb_fill_interrupt_transfer(struct libusb_transfer *transfer,
|
|
libusb_device_handle *devh, uint8_t endpoint, uint8_t *buf,
|
|
int length, libusb_transfer_cb_fn callback, void *user_data,
|
|
uint32_t timeout)
|
|
{
|
|
transfer->dev_handle = devh;
|
|
transfer->endpoint = endpoint;
|
|
transfer->type = LIBUSB_TRANSFER_TYPE_INTERRUPT;
|
|
transfer->timeout = timeout;
|
|
transfer->buffer = buf;
|
|
transfer->length = length;
|
|
transfer->user_data = user_data;
|
|
transfer->callback = callback;
|
|
}
|
|
|
|
void
|
|
libusb_fill_iso_transfer(struct libusb_transfer *transfer,
|
|
libusb_device_handle *devh, uint8_t endpoint, uint8_t *buf,
|
|
int length, int npacket, libusb_transfer_cb_fn callback,
|
|
void *user_data, uint32_t timeout)
|
|
{
|
|
transfer->dev_handle = devh;
|
|
transfer->endpoint = endpoint;
|
|
transfer->type = LIBUSB_TRANSFER_TYPE_ISOCHRONOUS;
|
|
transfer->timeout = timeout;
|
|
transfer->buffer = buf;
|
|
transfer->length = length;
|
|
transfer->num_iso_packets = npacket;
|
|
transfer->user_data = user_data;
|
|
transfer->callback = callback;
|
|
}
|
|
|
|
int
|
|
libusb_alloc_streams(libusb_device_handle *dev, uint32_t num_streams,
|
|
unsigned char *endpoints, int num_endpoints)
|
|
{
|
|
if (num_streams > 1)
|
|
return (LIBUSB_ERROR_INVALID_PARAM);
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
libusb_free_streams(libusb_device_handle *dev, unsigned char *endpoints, int num_endpoints)
|
|
{
|
|
|
|
return (0);
|
|
}
|
|
|
|
void
|
|
libusb_transfer_set_stream_id(struct libusb_transfer *transfer, uint32_t stream_id)
|
|
{
|
|
struct libusb_super_transfer *sxfer;
|
|
|
|
if (transfer == NULL)
|
|
return;
|
|
|
|
sxfer = (struct libusb_super_transfer *)(
|
|
((uint8_t *)transfer) - sizeof(*sxfer));
|
|
|
|
/* set stream ID */
|
|
sxfer->stream_id = stream_id;
|
|
}
|
|
|
|
uint32_t
|
|
libusb_transfer_get_stream_id(struct libusb_transfer *transfer)
|
|
{
|
|
struct libusb_super_transfer *sxfer;
|
|
|
|
if (transfer == NULL)
|
|
return (0);
|
|
|
|
sxfer = (struct libusb_super_transfer *)(
|
|
((uint8_t *)transfer) - sizeof(*sxfer));
|
|
|
|
/* get stream ID */
|
|
return (sxfer->stream_id);
|
|
}
|