aboutsummaryrefslogtreecommitdiff
path: root/hw/usb/core.c
blob: e960036f4d5c1c6d521db73419841708db62b683 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
/*
 * QEMU USB emulation
 *
 * Copyright (c) 2005 Fabrice Bellard
 *
 * 2008 Generic packet handler rewrite by Max Krasnyansky
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
#include "qemu/osdep.h"
#include "hw/usb.h"
#include "qemu/iov.h"
#include "trace.h"

void usb_pick_speed(USBPort *port)
{
    static const int speeds[] = {
        USB_SPEED_SUPER,
        USB_SPEED_HIGH,
        USB_SPEED_FULL,
        USB_SPEED_LOW,
    };
    USBDevice *udev = port->dev;
    int i;

    for (i = 0; i < ARRAY_SIZE(speeds); i++) {
        if ((udev->speedmask & (1 << speeds[i])) &&
            (port->speedmask & (1 << speeds[i]))) {
            udev->speed = speeds[i];
            return;
        }
    }
}

void usb_attach(USBPort *port)
{
    USBDevice *dev = port->dev;

    assert(dev != NULL);
    assert(dev->attached);
    assert(dev->state == USB_STATE_NOTATTACHED);
    usb_pick_speed(port);
    port->ops->attach(port);
    dev->state = USB_STATE_ATTACHED;
    usb_device_handle_attach(dev);
}

void usb_detach(USBPort *port)
{
    USBDevice *dev = port->dev;

    assert(dev != NULL);
    assert(dev->state != USB_STATE_NOTATTACHED);
    port->ops->detach(port);
    dev->state = USB_STATE_NOTATTACHED;
}

void usb_port_reset(USBPort *port)
{
    USBDevice *dev = port->dev;

    assert(dev != NULL);
    usb_detach(port);
    usb_attach(port);
    usb_device_reset(dev);
}

void usb_device_reset(USBDevice *dev)
{
    if (dev == NULL || !dev->attached) {
        return;
    }
    usb_device_handle_reset(dev);
    dev->remote_wakeup = 0;
    dev->addr = 0;
    dev->state = USB_STATE_DEFAULT;
}

void usb_wakeup(USBEndpoint *ep, unsigned int stream)
{
    USBDevice *dev = ep->dev;
    USBBus *bus = usb_bus_from_device(dev);

    if (!phase_check(PHASE_MACHINE_READY)) {
        /*
         * This is machine init cold plug.  No need to wakeup anyone,
         * all devices will be reset anyway.  And trying to wakeup can
         * cause problems due to hitting uninitialized devices.
         */
        return;
    }
    if (dev->remote_wakeup && dev->port && dev->port->ops->wakeup) {
        dev->port->ops->wakeup(dev->port);
    }
    if (bus->ops->wakeup_endpoint) {
        bus->ops->wakeup_endpoint(bus, ep, stream);
    }
}

/**********************/

/* generic USB device helpers (you are not forced to use them when
   writing your USB device driver, but they help handling the
   protocol)
*/

#define SETUP_STATE_IDLE  0
#define SETUP_STATE_SETUP 1
#define SETUP_STATE_DATA  2
#define SETUP_STATE_ACK   3
#define SETUP_STATE_PARAM 4

static void do_token_setup(USBDevice *s, USBPacket *p)
{
    int request, value, index;
    unsigned int setup_len;

    if (p->iov.size != 8) {
        p->status = USB_RET_STALL;
        return;
    }

    usb_packet_copy(p, s->setup_buf, p->iov.size);
    s->setup_index = 0;
    p->actual_length = 0;
    setup_len = (s->setup_buf[7] << 8) | s->setup_buf[6];
    if (setup_len > sizeof(s->data_buf)) {
        fprintf(stderr,
                "usb_generic_handle_packet: ctrl buffer too small (%d > %zu)\n",
                setup_len, sizeof(s->data_buf));
        p->status = USB_RET_STALL;
        return;
    }
    s->setup_len = setup_len;

    request = (s->setup_buf[0] << 8) | s->setup_buf[1];
    value   = (s->setup_buf[3] << 8) | s->setup_buf[2];
    index   = (s->setup_buf[5] << 8) | s->setup_buf[4];

    if (s->setup_buf[0] & USB_DIR_IN) {
        usb_device_handle_control(s, p, request, value, index,
                                  s->setup_len, s->data_buf);
        if (p->status == USB_RET_ASYNC) {
            s->setup_state = SETUP_STATE_SETUP;
        }
        if (p->status != USB_RET_SUCCESS) {
            return;
        }

        if (p->actual_length < s->setup_len) {
            s->setup_len = p->actual_length;
        }
        s->setup_state = SETUP_STATE_DATA;
    } else {
        if (s->setup_len == 0)
            s->setup_state = SETUP_STATE_ACK;
        else
            s->setup_state = SETUP_STATE_DATA;
    }

    p->actual_length = 8;
}

static void do_token_in(USBDevice *s, USBPacket *p)
{
    int request, value, index;

    assert(p->ep->nr == 0);

    request = (s->setup_buf[0] << 8) | s->setup_buf[1];
    value   = (s->setup_buf[3] << 8) | s->setup_buf[2];
    index   = (s->setup_buf[5] << 8) | s->setup_buf[4];

    switch(s->setup_state) {
    case SETUP_STATE_ACK:
        if (!(s->setup_buf[0] & USB_DIR_IN)) {
            usb_device_handle_control(s, p, request, value, index,
                                      s->setup_len, s->data_buf);
            if (p->status == USB_RET_ASYNC) {
                return;
            }
            s->setup_state = SETUP_STATE_IDLE;
            p->actual_length = 0;
        }
        break;

    case SETUP_STATE_DATA:
        if (s->setup_buf[0] & USB_DIR_IN) {
            int len = s->setup_len - s->setup_index;
            if (len > p->iov.size) {
                len = p->iov.size;
            }
            usb_packet_copy(p, s->data_buf + s->setup_index, len);
            s->setup_index += len;
            if (s->setup_index >= s->setup_len) {
                s->setup_state = SETUP_STATE_ACK;
            }
            return;
        }
        s->setup_state = SETUP_STATE_IDLE;
        p->status = USB_RET_STALL;
        break;

    default:
        p->status = USB_RET_STALL;
    }
}

static void do_token_out(USBDevice *s, USBPacket *p)
{
    assert(p->ep->nr == 0);

    switch(s->setup_state) {
    case SETUP_STATE_ACK:
        if (s->setup_buf[0] & USB_DIR_IN) {
            s->setup_state = SETUP_STATE_IDLE;
            /* transfer OK */
        } else {
            /* ignore additional output */
        }
        break;

    case SETUP_STATE_DATA:
        if (!(s->setup_buf[0] & USB_DIR_IN)) {
            int len = s->setup_len - s->setup_index;
            if (len > p->iov.size) {
                len = p->iov.size;
            }
            usb_packet_copy(p, s->data_buf + s->setup_index, len);
            s->setup_index += len;
            if (s->setup_index >= s->setup_len) {
                s->setup_state = SETUP_STATE_ACK;
            }
            return;
        }
        s->setup_state = SETUP_STATE_IDLE;
        p->status = USB_RET_STALL;
        break;

    default:
        p->status = USB_RET_STALL;
    }
}

static void do_parameter(USBDevice *s, USBPacket *p)
{
    int i, request, value, index;
    unsigned int setup_len;

    for (i = 0; i < 8; i++) {
        s->setup_buf[i] = p->parameter >> (i*8);
    }

    s->setup_state = SETUP_STATE_PARAM;
    s->setup_index = 0;

    request = (s->setup_buf[0] << 8) | s->setup_buf[1];
    value   = (s->setup_buf[3] << 8) | s->setup_buf[2];
    index   = (s->setup_buf[5] << 8) | s->setup_buf[4];

    setup_len = (s->setup_buf[7] << 8) | s->setup_buf[6];
    if (setup_len > sizeof(s->data_buf)) {
        fprintf(stderr,
                "usb_generic_handle_packet: ctrl buffer too small (%d > %zu)\n",
                setup_len, sizeof(s->data_buf));
        p->status = USB_RET_STALL;
        return;
    }
    s->setup_len = setup_len;

    if (p->pid == USB_TOKEN_OUT) {
        usb_packet_copy(p, s->data_buf, s->setup_len);
    }

    usb_device_handle_control(s, p, request, value, index,
                              s->setup_len, s->data_buf);
    if (p->status == USB_RET_ASYNC) {
        return;
    }

    if (p->actual_length < s->setup_len) {
        s->setup_len = p->actual_length;
    }
    if (p->pid == USB_TOKEN_IN) {
        p->actual_length = 0;
        usb_packet_copy(p, s->data_buf, s->setup_len);
    }
}

/* ctrl complete function for devices which use usb_generic_handle_packet and
   may return USB_RET_ASYNC from their handle_control callback. Device code
   which does this *must* call this function instead of the normal
   usb_packet_complete to complete their async control packets. */
void usb_generic_async_ctrl_complete(USBDevice *s, USBPacket *p)
{
    if (p->status < 0) {
        s->setup_state = SETUP_STATE_IDLE;
    }

    switch (s->setup_state) {
    case SETUP_STATE_SETUP:
        if (p->actual_length < s->setup_len) {
            s->setup_len = p->actual_length;
        }
        s->setup_state = SETUP_STATE_DATA;
        p->actual_length = 8;
        break;

    case SETUP_STATE_ACK:
        s->setup_state = SETUP_STATE_IDLE;
        p->actual_length = 0;
        break;

    case SETUP_STATE_PARAM:
        if (p->actual_length < s->setup_len) {
            s->setup_len = p->actual_length;
        }
        if (p->pid == USB_TOKEN_IN) {
            p->actual_length = 0;
            usb_packet_copy(p, s->data_buf, s->setup_len);
        }
        break;

    default:
        break;
    }
    usb_packet_complete(s, p);
}

USBDevice *usb_find_device(USBPort *port, uint8_t addr)
{
    USBDevice *dev = port->dev;

    if (dev == NULL || !dev->attached || dev->state != USB_STATE_DEFAULT) {
        return NULL;
    }
    if (dev->addr == addr) {
        return dev;
    }
    return usb_device_find_device(dev, addr);
}

static void usb_process_one(USBPacket *p)
{
    USBDevice *dev = p->ep->dev;

    /*
     * Handlers expect status to be initialized to USB_RET_SUCCESS, but it
     * can be USB_RET_NAK here from a previous usb_process_one() call,
     * or USB_RET_ASYNC from going through usb_queue_one().
     */
    p->status = USB_RET_SUCCESS;

    if (p->ep->nr == 0) {
        /* control pipe */
        if (p->parameter) {
            do_parameter(dev, p);
            return;
        }
        switch (p->pid) {
        case USB_TOKEN_SETUP:
            do_token_setup(dev, p);
            break;
        case USB_TOKEN_IN:
            do_token_in(dev, p);
            break;
        case USB_TOKEN_OUT:
            do_token_out(dev, p);
            break;
        default:
            p->status = USB_RET_STALL;
        }
    } else {
        /* data pipe */
        usb_device_handle_data(dev, p);
    }
}

static void usb_queue_one(USBPacket *p)
{
    usb_packet_set_state(p, USB_PACKET_QUEUED);
    QTAILQ_INSERT_TAIL(&p->ep->queue, p, queue);
    p->status = USB_RET_ASYNC;
}

/* Hand over a packet to a device for processing.  p->status ==
   USB_RET_ASYNC indicates the processing isn't finished yet, the
   driver will call usb_packet_complete() when done processing it. */
void usb_handle_packet(USBDevice *dev, USBPacket *p)
{
    if (dev == NULL) {
        p->status = USB_RET_NODEV;
        return;
    }
    assert(dev == p->ep->dev);
    assert(dev->state == USB_STATE_DEFAULT);
    usb_packet_check_state(p, USB_PACKET_SETUP);
    assert(p->ep != NULL);

    /* Submitting a new packet clears halt */
    if (p->ep->halted) {
        assert(QTAILQ_EMPTY(&p->ep->queue));
        p->ep->halted = false;
    }

    if (QTAILQ_EMPTY(&p->ep->queue) || p->ep->pipeline || p->stream) {
        usb_process_one(p);
        if (p->status == USB_RET_ASYNC) {
            /* hcd drivers cannot handle async for isoc */
            assert(p->ep->type != USB_ENDPOINT_XFER_ISOC);
            /* using async for interrupt packets breaks migration */
            assert(p->ep->type != USB_ENDPOINT_XFER_INT ||
                   (dev->flags & (1 << USB_DEV_FLAG_IS_HOST)));
            usb_packet_set_state(p, USB_PACKET_ASYNC);
            QTAILQ_INSERT_TAIL(&p->ep->queue, p, queue);
        } else if (p->status == USB_RET_ADD_TO_QUEUE) {
            usb_queue_one(p);
        } else {
            /*
             * When pipelining is enabled usb-devices must always return async,
             * otherwise packets can complete out of order!
             */
            assert(p->stream || !p->ep->pipeline ||
                   QTAILQ_EMPTY(&p->ep->queue));
            if (p->status != USB_RET_NAK) {
                usb_packet_set_state(p, USB_PACKET_COMPLETE);
            }
        }
    } else {
        usb_queue_one(p);
    }
}

void usb_packet_complete_one(USBDevice *dev, USBPacket *p)
{
    USBEndpoint *ep = p->ep;

    assert(p->stream || QTAILQ_FIRST(&ep->queue) == p);
    assert(p->status != USB_RET_ASYNC && p->status != USB_RET_NAK);

    if (p->status != USB_RET_SUCCESS ||
            (p->short_not_ok && (p->actual_length < p->iov.size))) {
        ep->halted = true;
    }
    usb_packet_set_state(p, USB_PACKET_COMPLETE);
    QTAILQ_REMOVE(&ep->queue, p, queue);
    dev->port->ops->complete(dev->port, p);
}

/* Notify the controller that an async packet is complete.  This should only
   be called for packets previously deferred by returning USB_RET_ASYNC from
   handle_packet. */
void usb_packet_complete(USBDevice *dev, USBPacket *p)
{
    USBEndpoint *ep = p->ep;

    usb_packet_check_state(p, USB_PACKET_ASYNC);
    usb_packet_complete_one(dev, p);

    while (!QTAILQ_EMPTY(&ep->queue)) {
        p = QTAILQ_FIRST(&ep->queue);
        if (ep->halted) {
            /* Empty the queue on a halt */
            p->status = USB_RET_REMOVE_FROM_QUEUE;
            dev->port->ops->complete(dev->port, p);
            continue;
        }
        if (p->state == USB_PACKET_ASYNC) {
            break;
        }
        usb_packet_check_state(p, USB_PACKET_QUEUED);
        usb_process_one(p);
        if (p->status == USB_RET_ASYNC) {
            usb_packet_set_state(p, USB_PACKET_ASYNC);
            break;
        }
        usb_packet_complete_one(ep->dev, p);
    }
}

/* Cancel an active packet.  The packed must have been deferred by
   returning USB_RET_ASYNC from handle_packet, and not yet
   completed.  */
void usb_cancel_packet(USBPacket * p)
{
    bool callback = (p->state == USB_PACKET_ASYNC);
    assert(usb_packet_is_inflight(p));
    usb_packet_set_state(p, USB_PACKET_CANCELED);
    QTAILQ_REMOVE(&p->ep->queue, p, queue);
    if (callback) {
        usb_device_cancel_packet(p->ep->dev, p);
    }
}


void usb_packet_init(USBPacket *p)
{
    qemu_iovec_init(&p->iov, 1);
}

static const char *usb_packet_state_name(USBPacketState state)
{
    static const char *name[] = {
        [USB_PACKET_UNDEFINED] = "undef",
        [USB_PACKET_SETUP]     = "setup",
        [USB_PACKET_QUEUED]    = "queued",
        [USB_PACKET_ASYNC]     = "async",
        [USB_PACKET_COMPLETE]  = "complete",
        [USB_PACKET_CANCELED]  = "canceled",
    };
    if (state < ARRAY_SIZE(name)) {
        return name[state];
    }
    return "INVALID";
}

void usb_packet_check_state(USBPacket *p, USBPacketState expected)
{
    USBDevice *dev;
    USBBus *bus;

    if (p->state == expected) {
        return;
    }
    dev = p->ep->dev;
    bus = usb_bus_from_device(dev);
    trace_usb_packet_state_fault(bus->busnr, dev->port->path, p->ep->nr, p,
                                 usb_packet_state_name(p->state),
                                 usb_packet_state_name(expected));
    assert(!"usb packet state check failed");
}

void usb_packet_set_state(USBPacket *p, USBPacketState state)
{
    if (p->ep) {
        USBDevice *dev = p->ep->dev;
        USBBus *bus = usb_bus_from_device(dev);
        trace_usb_packet_state_change(bus->busnr, dev->port->path, p->ep->nr, p,
                                      usb_packet_state_name(p->state),
                                      usb_packet_state_name(state));
    } else {
        trace_usb_packet_state_change(-1, "", -1, p,
                                      usb_packet_state_name(p->state),
                                      usb_packet_state_name(state));
    }
    p->state = state;
}

void usb_packet_setup(USBPacket *p, int pid,
                      USBEndpoint *ep, unsigned int stream,
                      uint64_t id, bool short_not_ok, bool int_req)
{
    assert(!usb_packet_is_inflight(p));
    assert(p->iov.iov != NULL);
    p->id = id;
    p->pid = pid;
    p->ep = ep;
    p->stream = stream;
    p->status = USB_RET_SUCCESS;
    p->actual_length = 0;
    p->parameter = 0;
    p->short_not_ok = short_not_ok;
    p->int_req = int_req;
    p->combined = NULL;
    qemu_iovec_reset(&p->iov);
    usb_packet_set_state(p, USB_PACKET_SETUP);
}

void usb_packet_addbuf(USBPacket *p, void *ptr, size_t len)
{
    qemu_iovec_add(&p->iov, ptr, len);
}

void usb_packet_copy(USBPacket *p, void *ptr, size_t bytes)
{
    QEMUIOVector *iov = p->combined ? &p->combined->iov : &p->iov;

    assert(p->actual_length >= 0);
    assert(p->actual_length + bytes <= iov->size);
    switch (p->pid) {
    case USB_TOKEN_SETUP:
    case USB_TOKEN_OUT:
        iov_to_buf(iov->iov, iov->niov, p->actual_length, ptr, bytes);
        break;
    case USB_TOKEN_IN:
        iov_from_buf(iov->iov, iov->niov, p->actual_length, ptr, bytes);
        break;
    default:
        fprintf(stderr, "%s: invalid pid: %x\n", __func__, p->pid);
        abort();
    }
    p->actual_length += bytes;
}

void usb_packet_skip(USBPacket *p, size_t bytes)
{
    QEMUIOVector *iov = p->combined ? &p->combined->iov : &p->iov;

    assert(p->actual_length >= 0);
    assert(p->actual_length + bytes <= iov->size);
    if (p->pid == USB_TOKEN_IN) {
        iov_memset(iov->iov, iov->niov, p->actual_length, 0, bytes);
    }
    p->actual_length += bytes;
}

size_t usb_packet_size(USBPacket *p)
{
    return p->combined ? p->combined->iov.size : p->iov.size;
}

void usb_packet_cleanup(USBPacket *p)
{
    assert(!usb_packet_is_inflight(p));
    qemu_iovec_destroy(&p->iov);
}

void usb_ep_reset(USBDevice *dev)
{
    int ep;

    dev->ep_ctl.nr = 0;
    dev->ep_ctl.type = USB_ENDPOINT_XFER_CONTROL;
    dev->ep_ctl.ifnum = 0;
    dev->ep_ctl.max_packet_size = 64;
    dev->ep_ctl.max_streams = 0;
    dev->ep_ctl.dev = dev;
    dev->ep_ctl.pipeline = false;
    for (ep = 0; ep < USB_MAX_ENDPOINTS; ep++) {
        dev->ep_in[ep].nr = ep + 1;
        dev->ep_out[ep].nr = ep + 1;
        dev->ep_in[ep].pid = USB_TOKEN_IN;
        dev->ep_out[ep].pid = USB_TOKEN_OUT;
        dev->ep_in[ep].type = USB_ENDPOINT_XFER_INVALID;
        dev->ep_out[ep].type = USB_ENDPOINT_XFER_INVALID;
        dev->ep_in[ep].ifnum = USB_INTERFACE_INVALID;
        dev->ep_out[ep].ifnum = USB_INTERFACE_INVALID;
        dev->ep_in[ep].max_packet_size = 0;
        dev->ep_out[ep].max_packet_size = 0;
        dev->ep_in[ep].max_streams = 0;
        dev->ep_out[ep].max_streams = 0;
        dev->ep_in[ep].dev = dev;
        dev->ep_out[ep].dev = dev;
        dev->ep_in[ep].pipeline = false;
        dev->ep_out[ep].pipeline = false;
    }
}

void usb_ep_init(USBDevice *dev)
{
    int ep;

    usb_ep_reset(dev);
    QTAILQ_INIT(&dev->ep_ctl.queue);
    for (ep = 0; ep < USB_MAX_ENDPOINTS; ep++) {
        QTAILQ_INIT(&dev->ep_in[ep].queue);
        QTAILQ_INIT(&dev->ep_out[ep].queue);
    }
}

void usb_ep_dump(USBDevice *dev)
{
    static const char *tname[] = {
        [USB_ENDPOINT_XFER_CONTROL] = "control",
        [USB_ENDPOINT_XFER_ISOC]    = "isoc",
        [USB_ENDPOINT_XFER_BULK]    = "bulk",
        [USB_ENDPOINT_XFER_INT]     = "int",
    };
    int ifnum, ep, first;

    fprintf(stderr, "Device \"%s\", config %d\n",
            dev->product_desc, dev->configuration);
    for (ifnum = 0; ifnum < 16; ifnum++) {
        first = 1;
        for (ep = 0; ep < USB_MAX_ENDPOINTS; ep++) {
            if (dev->ep_in[ep].type != USB_ENDPOINT_XFER_INVALID &&
                dev->ep_in[ep].ifnum == ifnum) {
                if (first) {
                    first = 0;
                    fprintf(stderr, "  Interface %d, alternative %d\n",
                            ifnum, dev->altsetting[ifnum]);
                }
                fprintf(stderr, "    Endpoint %d, IN, %s, %d max\n", ep,
                        tname[dev->ep_in[ep].type],
                        dev->ep_in[ep].max_packet_size);
            }
            if (dev->ep_out[ep].type != USB_ENDPOINT_XFER_INVALID &&
                dev->ep_out[ep].ifnum == ifnum) {
                if (first) {
                    first = 0;
                    fprintf(stderr, "  Interface %d, alternative %d\n",
                            ifnum, dev->altsetting[ifnum]);
                }
                fprintf(stderr, "    Endpoint %d, OUT, %s, %d max\n", ep,
                        tname[dev->ep_out[ep].type],
                        dev->ep_out[ep].max_packet_size);
            }
        }
    }
    fprintf(stderr, "--\n");
}

struct USBEndpoint *usb_ep_get(USBDevice *dev, int pid, int ep)
{
    struct USBEndpoint *eps;

    assert(dev != NULL);
    if (ep == 0) {
        return &dev->ep_ctl;
    }
    assert(pid == USB_TOKEN_IN || pid == USB_TOKEN_OUT);
    assert(ep > 0 && ep <= USB_MAX_ENDPOINTS);
    eps = (pid == USB_TOKEN_IN) ? dev->ep_in : dev->ep_out;
    return eps + ep - 1;
}

uint8_t usb_ep_get_type(USBDevice *dev, int pid, int ep)
{
    struct USBEndpoint *uep = usb_ep_get(dev, pid, ep);
    return uep->type;
}

void usb_ep_set_type(USBDevice *dev, int pid, int ep, uint8_t type)
{
    struct USBEndpoint *uep = usb_ep_get(dev, pid, ep);
    uep->type = type;
}

void usb_ep_set_ifnum(USBDevice *dev, int pid, int ep, uint8_t ifnum)
{
    struct USBEndpoint *uep = usb_ep_get(dev, pid, ep);
    uep->ifnum = ifnum;
}

void usb_ep_set_max_packet_size(USBDevice *dev, int pid, int ep,
                                uint16_t raw)
{
    struct USBEndpoint *uep = usb_ep_get(dev, pid, ep);
    int size, microframes;

    size = raw & 0x7ff;
    switch ((raw >> 11) & 3) {
    case 1:
        microframes = 2;
        break;
    case 2:
        microframes = 3;
        break;
    default:
        microframes = 1;
        break;
    }
    uep->max_packet_size = size * microframes;
}

void usb_ep_set_max_streams(USBDevice *dev, int pid, int ep, uint8_t raw)
{
    struct USBEndpoint *uep = usb_ep_get(dev, pid, ep);
    int MaxStreams;

    MaxStreams = raw & 0x1f;
    if (MaxStreams) {
        uep->max_streams = 1 << MaxStreams;
    } else {
        uep->max_streams = 0;
    }
}

void usb_ep_set_halted(USBDevice *dev, int pid, int ep, bool halted)
{
    struct USBEndpoint *uep = usb_ep_get(dev, pid, ep);
    uep->halted = halted;
}

USBPacket *usb_ep_find_packet_by_id(USBDevice *dev, int pid, int ep,
                                    uint64_t id)
{
    struct USBEndpoint *uep = usb_ep_get(dev, pid, ep);
    USBPacket *p;

    QTAILQ_FOREACH(p, &uep->queue, queue) {
        if (p->id == id) {
            return p;
        }
    }

    return NULL;
}