hw/usb/core.c

   1 /*
   2  * QEMU USB emulation
   3  *
   4  * Copyright (c) 2005 Fabrice Bellard
   5  *
   6  * 2008 Generic packet handler rewrite by Max Krasnyansky
   7  *
   8  * Permission is hereby granted, free of charge, to any person obtaining a copy
   9  * of this software and associated documentation files (the "Software"), to deal
  10  * in the Software without restriction, including without limitation the rights
  11  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  12  * copies of the Software, and to permit persons to whom the Software is
  13  * furnished to do so, subject to the following conditions:
  14  *
  15  * The above copyright notice and this permission notice shall be included in
  16  * all copies or substantial portions of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  21  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  22  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  23  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  24  * THE SOFTWARE.
  25  */
  26 #include "qemu-common.h"
  27 #include "hw/usb.h"
  28 #include "iov.h"
  29 #include "trace.h"
  30
  31 void usb_attach(USBPort *port)
  32 {
  33     USBDevice *dev = port->dev;
  34
  35     assert(dev != NULL);
  36     assert(dev->attached);
  37     assert(dev->state == USB_STATE_NOTATTACHED);
  38     port->ops->attach(port);
  39     dev->state = USB_STATE_ATTACHED;
  40     usb_device_handle_attach(dev);
  41 }
  42
  43 void usb_detach(USBPort *port)
  44 {
  45     USBDevice *dev = port->dev;
  46
  47     assert(dev != NULL);
  48     assert(dev->state != USB_STATE_NOTATTACHED);
  49     port->ops->detach(port);
  50     dev->state = USB_STATE_NOTATTACHED;
  51 }
  52
  53 void usb_port_reset(USBPort *port)
  54 {
  55     USBDevice *dev = port->dev;
  56
  57     assert(dev != NULL);
  58     usb_detach(port);
  59     usb_attach(port);
  60     usb_device_reset(dev);
  61 }
  62
  63 void usb_device_reset(USBDevice *dev)
  64 {
  65     if (dev == NULL || !dev->attached) {
  66         return;
  67     }
  68     dev->remote_wakeup = 0;
  69     dev->addr = 0;
  70     dev->state = USB_STATE_DEFAULT;
  71     usb_device_handle_reset(dev);
  72 }
  73
  74 void usb_wakeup(USBEndpoint *ep)
  75 {
  76     USBDevice *dev = ep->dev;
  77     USBBus *bus = usb_bus_from_device(dev);
  78
  79     if (dev->remote_wakeup && dev->port && dev->port->ops->wakeup) {
  80         dev->port->ops->wakeup(dev->port);
  81     }
  82     if (bus->ops->wakeup_endpoint) {
  83         bus->ops->wakeup_endpoint(bus, ep);
  84     }
  85 }
  86
  87 /**********************/
  88
  89 /* generic USB device helpers (you are not forced to use them when
  90    writing your USB device driver, but they help handling the
  91    protocol)
  92 */
  93
  94 #define SETUP_STATE_IDLE  0
  95 #define SETUP_STATE_SETUP 1
  96 #define SETUP_STATE_DATA  2
  97 #define SETUP_STATE_ACK   3
  98 #define SETUP_STATE_PARAM 4
  99
 100 static void do_token_setup(USBDevice *s, USBPacket *p)
 101 {
 102     int request, value, index;
 103
 104     if (p->iov.size != 8) {
 105         p->status = USB_RET_STALL;
 106         return;
 107     }
 108
 109     usb_packet_copy(p, s->setup_buf, p->iov.size);
 110     p->actual_length = 0;
 111     s->setup_len   = (s->setup_buf[7] << 8) | s->setup_buf[6];
 112     s->setup_index = 0;
 113
 114     request = (s->setup_buf[0] << 8) | s->setup_buf[1];
 115     value   = (s->setup_buf[3] << 8) | s->setup_buf[2];
 116     index   = (s->setup_buf[5] << 8) | s->setup_buf[4];
 117
 118     if (s->setup_buf[0] & USB_DIR_IN) {
 119         usb_device_handle_control(s, p, request, value, index,
 120                                   s->setup_len, s->data_buf);
 121         if (p->status == USB_RET_ASYNC) {
 122             s->setup_state = SETUP_STATE_SETUP;
 123         }
 124         if (p->status != USB_RET_SUCCESS) {
 125             return;
 126         }
 127
 128         if (p->actual_length < s->setup_len) {
 129             s->setup_len = p->actual_length;
 130         }
 131         s->setup_state = SETUP_STATE_DATA;
 132     } else {
 133         if (s->setup_len > sizeof(s->data_buf)) {
 134             fprintf(stderr,
 135                 "usb_generic_handle_packet: ctrl buffer too small (%d > %zu)\n",
 136                 s->setup_len, sizeof(s->data_buf));
 137             p->status = USB_RET_STALL;
 138             return;
 139         }
 140         if (s->setup_len == 0)
 141             s->setup_state = SETUP_STATE_ACK;
 142         else
 143             s->setup_state = SETUP_STATE_DATA;
 144     }
 145
 146     p->actual_length = 8;
 147 }
 148
 149 static void do_token_in(USBDevice *s, USBPacket *p)
 150 {
 151     int request, value, index;
 152
 153     assert(p->ep->nr == 0);
 154
 155     request = (s->setup_buf[0] << 8) | s->setup_buf[1];
 156     value   = (s->setup_buf[3] << 8) | s->setup_buf[2];
 157     index   = (s->setup_buf[5] << 8) | s->setup_buf[4];
 158
 159     switch(s->setup_state) {
 160     case SETUP_STATE_ACK:
 161         if (!(s->setup_buf[0] & USB_DIR_IN)) {
 162             usb_device_handle_control(s, p, request, value, index,
 163                                       s->setup_len, s->data_buf);
 164             if (p->status == USB_RET_ASYNC) {
 165                 return;
 166             }
 167             s->setup_state = SETUP_STATE_IDLE;
 168             p->actual_length = 0;
 169         }
 170         break;
 171
 172     case SETUP_STATE_DATA:
 173         if (s->setup_buf[0] & USB_DIR_IN) {
 174             int len = s->setup_len - s->setup_index;
 175             if (len > p->iov.size) {
 176                 len = p->iov.size;
 177             }
 178             usb_packet_copy(p, s->data_buf + s->setup_index, len);
 179             s->setup_index += len;
 180             if (s->setup_index >= s->setup_len) {
 181                 s->setup_state = SETUP_STATE_ACK;
 182             }
 183             return;
 184         }
 185         s->setup_state = SETUP_STATE_IDLE;
 186         p->status = USB_RET_STALL;
 187         break;
 188
 189     default:
 190         p->status = USB_RET_STALL;
 191     }
 192 }
 193
 194 static void do_token_out(USBDevice *s, USBPacket *p)
 195 {
 196     assert(p->ep->nr == 0);
 197
 198     switch(s->setup_state) {
 199     case SETUP_STATE_ACK:
 200         if (s->setup_buf[0] & USB_DIR_IN) {
 201             s->setup_state = SETUP_STATE_IDLE;
 202             /* transfer OK */
 203         } else {
 204             /* ignore additional output */
 205         }
 206         break;
 207
 208     case SETUP_STATE_DATA:
 209         if (!(s->setup_buf[0] & USB_DIR_IN)) {
 210             int len = s->setup_len - s->setup_index;
 211             if (len > p->iov.size) {
 212                 len = p->iov.size;
 213             }
 214             usb_packet_copy(p, s->data_buf + s->setup_index, len);
 215             s->setup_index += len;
 216             if (s->setup_index >= s->setup_len) {
 217                 s->setup_state = SETUP_STATE_ACK;
 218             }
 219             return;
 220         }
 221         s->setup_state = SETUP_STATE_IDLE;
 222         p->status = USB_RET_STALL;
 223         break;
 224
 225     default:
 226         p->status = USB_RET_STALL;
 227     }
 228 }
 229
 230 static void do_parameter(USBDevice *s, USBPacket *p)
 231 {
 232     int i, request, value, index;
 233
 234     for (i = 0; i < 8; i++) {
 235         s->setup_buf[i] = p->parameter >> (i*8);
 236     }
 237
 238     s->setup_state = SETUP_STATE_PARAM;
 239     s->setup_len   = (s->setup_buf[7] << 8) | s->setup_buf[6];
 240     s->setup_index = 0;
 241
 242     request = (s->setup_buf[0] << 8) | s->setup_buf[1];
 243     value   = (s->setup_buf[3] << 8) | s->setup_buf[2];
 244     index   = (s->setup_buf[5] << 8) | s->setup_buf[4];
 245
 246     if (s->setup_len > sizeof(s->data_buf)) {
 247         fprintf(stderr,
 248                 "usb_generic_handle_packet: ctrl buffer too small (%d > %zu)\n",
 249                 s->setup_len, sizeof(s->data_buf));
 250         p->status = USB_RET_STALL;
 251         return;
 252     }
 253
 254     if (p->pid == USB_TOKEN_OUT) {
 255         usb_packet_copy(p, s->data_buf, s->setup_len);
 256     }
 257
 258     usb_device_handle_control(s, p, request, value, index,
 259                               s->setup_len, s->data_buf);
 260     if (p->status == USB_RET_ASYNC) {
 261         return;
 262     }
 263
 264     if (p->actual_length < s->setup_len) {
 265         s->setup_len = p->actual_length;
 266     }
 267     if (p->pid == USB_TOKEN_IN) {
 268         p->actual_length = 0;
 269         usb_packet_copy(p, s->data_buf, s->setup_len);
 270     }
 271 }
 272
 273 /* ctrl complete function for devices which use usb_generic_handle_packet and
 274    may return USB_RET_ASYNC from their handle_control callback. Device code
 275    which does this *must* call this function instead of the normal
 276    usb_packet_complete to complete their async control packets. */
 277 void usb_generic_async_ctrl_complete(USBDevice *s, USBPacket *p)
 278 {
 279     if (p->status < 0) {
 280         s->setup_state = SETUP_STATE_IDLE;
 281     }
 282
 283     switch (s->setup_state) {
 284     case SETUP_STATE_SETUP:
 285         if (p->actual_length < s->setup_len) {
 286             s->setup_len = p->actual_length;
 287         }
 288         s->setup_state = SETUP_STATE_DATA;
 289         p->actual_length = 8;
 290         break;
 291
 292     case SETUP_STATE_ACK:
 293         s->setup_state = SETUP_STATE_IDLE;
 294         p->actual_length = 0;
 295         break;
 296
 297     case SETUP_STATE_PARAM:
 298         if (p->actual_length < s->setup_len) {
 299             s->setup_len = p->actual_length;
 300         }
 301         if (p->pid == USB_TOKEN_IN) {
 302             p->actual_length = 0;
 303             usb_packet_copy(p, s->data_buf, s->setup_len);
 304         }
 305         break;
 306
 307     default:
 308         break;
 309     }
 310     usb_packet_complete(s, p);
 311 }
 312
 313 /* XXX: fix overflow */
 314 int set_usb_string(uint8_t *buf, const char *str)
 315 {
 316     int len, i;
 317     uint8_t *q;
 318
 319     q = buf;
 320     len = strlen(str);
 321     *q++ = 2 * len + 2;
 322     *q++ = 3;
 323     for(i = 0; i < len; i++) {
 324         *q++ = str[i];
 325         *q++ = 0;
 326     }
 327     return q - buf;
 328 }
 329
 330 USBDevice *usb_find_device(USBPort *port, uint8_t addr)
 331 {
 332     USBDevice *dev = port->dev;
 333
 334     if (dev == NULL || !dev->attached || dev->state != USB_STATE_DEFAULT) {
 335         return NULL;
 336     }
 337     if (dev->addr == addr) {
 338         return dev;
 339     }
 340     return usb_device_find_device(dev, addr);
 341 }
 342
 343 static void usb_process_one(USBPacket *p)
 344 {
 345     USBDevice *dev = p->ep->dev;
 346
 347     /*
 348      * Handlers expect status to be initialized to USB_RET_SUCCESS, but it
 349      * can be USB_RET_NAK here from a previous usb_process_one() call,
 350      * or USB_RET_ASYNC from going through usb_queue_one().
 351      */
 352     p->status = USB_RET_SUCCESS;
 353
 354     if (p->ep->nr == 0) {
 355         /* control pipe */
 356         if (p->parameter) {
 357             do_parameter(dev, p);
 358             return;
 359         }
 360         switch (p->pid) {
 361         case USB_TOKEN_SETUP:
 362             do_token_setup(dev, p);
 363             break;
 364         case USB_TOKEN_IN:
 365             do_token_in(dev, p);
 366             break;
 367         case USB_TOKEN_OUT:
 368             do_token_out(dev, p);
 369             break;
 370         default:
 371             p->status = USB_RET_STALL;
 372         }
 373     } else {
 374         /* data pipe */
 375         usb_device_handle_data(dev, p);
 376     }
 377 }
 378
 379 static void usb_queue_one(USBPacket *p)
 380 {
 381     usb_packet_set_state(p, USB_PACKET_QUEUED);
 382     QTAILQ_INSERT_TAIL(&p->ep->queue, p, queue);
 383     p->status = USB_RET_ASYNC;
 384 }
 385
 386 /* Hand over a packet to a device for processing.  p->status ==
 387    USB_RET_ASYNC indicates the processing isn't finished yet, the
 388    driver will call usb_packet_complete() when done processing it. */
 389 void usb_handle_packet(USBDevice *dev, USBPacket *p)
 390 {
 391     if (dev == NULL) {
 392         p->status = USB_RET_NODEV;
 393         return;
 394     }
 395     assert(dev == p->ep->dev);
 396     assert(dev->state == USB_STATE_DEFAULT);
 397     usb_packet_check_state(p, USB_PACKET_SETUP);
 398     assert(p->ep != NULL);
 399
 400     /* Submitting a new packet clears halt */
 401     if (p->ep->halted) {
 402         assert(QTAILQ_EMPTY(&p->ep->queue));
 403         p->ep->halted = false;
 404     }
 405
 406     if (QTAILQ_EMPTY(&p->ep->queue) || p->ep->pipeline) {
 407         usb_process_one(p);
 408         if (p->status == USB_RET_ASYNC) {
 409             assert(p->ep->type != USB_ENDPOINT_XFER_ISOC);
 410             usb_packet_set_state(p, USB_PACKET_ASYNC);
 411             QTAILQ_INSERT_TAIL(&p->ep->queue, p, queue);
 412         } else if (p->status == USB_RET_ADD_TO_QUEUE) {
 413             usb_queue_one(p);
 414         } else {
 415             /*
 416              * When pipelining is enabled usb-devices must always return async,
 417              * otherwise packets can complete out of order!
 418              */
 419             assert(!p->ep->pipeline || QTAILQ_EMPTY(&p->ep->queue));
 420             if (p->status != USB_RET_NAK) {
 421                 usb_packet_set_state(p, USB_PACKET_COMPLETE);
 422             }
 423         }
 424     } else {
 425         usb_queue_one(p);
 426     }
 427 }
 428
 429 void usb_packet_complete_one(USBDevice *dev, USBPacket *p)
 430 {
 431     USBEndpoint *ep = p->ep;
 432
 433     assert(QTAILQ_FIRST(&ep->queue) == p);
 434     assert(p->status != USB_RET_ASYNC && p->status != USB_RET_NAK);
 435
 436     if (p->status != USB_RET_SUCCESS ||
 437             (p->short_not_ok && (p->actual_length < p->iov.size))) {
 438         ep->halted = true;
 439     }
 440     usb_packet_set_state(p, USB_PACKET_COMPLETE);
 441     QTAILQ_REMOVE(&ep->queue, p, queue);
 442     dev->port->ops->complete(dev->port, p);
 443 }
 444
 445 /* Notify the controller that an async packet is complete.  This should only
 446    be called for packets previously deferred by returning USB_RET_ASYNC from
 447    handle_packet. */
 448 void usb_packet_complete(USBDevice *dev, USBPacket *p)
 449 {
 450     USBEndpoint *ep = p->ep;
 451
 452     usb_packet_check_state(p, USB_PACKET_ASYNC);
 453     usb_packet_complete_one(dev, p);
 454
 455     while (!QTAILQ_EMPTY(&ep->queue)) {
 456         p = QTAILQ_FIRST(&ep->queue);
 457         if (ep->halted) {
 458             /* Empty the queue on a halt */
 459             p->status = USB_RET_REMOVE_FROM_QUEUE;
 460             dev->port->ops->complete(dev->port, p);
 461             continue;
 462         }
 463         if (p->state == USB_PACKET_ASYNC) {
 464             break;
 465         }
 466         usb_packet_check_state(p, USB_PACKET_QUEUED);
 467         usb_process_one(p);
 468         if (p->status == USB_RET_ASYNC) {
 469             usb_packet_set_state(p, USB_PACKET_ASYNC);
 470             break;
 471         }
 472         usb_packet_complete_one(ep->dev, p);
 473     }
 474 }
 475
 476 /* Cancel an active packet.  The packed must have been deferred by
 477    returning USB_RET_ASYNC from handle_packet, and not yet
 478    completed.  */
 479 void usb_cancel_packet(USBPacket * p)
 480 {
 481     bool callback = (p->state == USB_PACKET_ASYNC);
 482     assert(usb_packet_is_inflight(p));
 483     usb_packet_set_state(p, USB_PACKET_CANCELED);
 484     QTAILQ_REMOVE(&p->ep->queue, p, queue);
 485     if (callback) {
 486         usb_device_cancel_packet(p->ep->dev, p);
 487     }
 488 }
 489
 490
 491 void usb_packet_init(USBPacket *p)
 492 {
 493     qemu_iovec_init(&p->iov, 1);
 494 }
 495
 496 static const char *usb_packet_state_name(USBPacketState state)
 497 {
 498     static const char *name[] = {
 499         [USB_PACKET_UNDEFINED] = "undef",
 500         [USB_PACKET_SETUP]     = "setup",
 501         [USB_PACKET_QUEUED]    = "queued",
 502         [USB_PACKET_ASYNC]     = "async",
 503         [USB_PACKET_COMPLETE]  = "complete",
 504         [USB_PACKET_CANCELED]  = "canceled",
 505     };
 506     if (state < ARRAY_SIZE(name)) {
 507         return name[state];
 508     }
 509     return "INVALID";
 510 }
 511
 512 void usb_packet_check_state(USBPacket *p, USBPacketState expected)
 513 {
 514     USBDevice *dev;
 515     USBBus *bus;
 516
 517     if (p->state == expected) {
 518         return;
 519     }
 520     dev = p->ep->dev;
 521     bus = usb_bus_from_device(dev);
 522     trace_usb_packet_state_fault(bus->busnr, dev->port->path, p->ep->nr, p,
 523                                  usb_packet_state_name(p->state),
 524                                  usb_packet_state_name(expected));
 525     assert(!"usb packet state check failed");
 526 }
 527
 528 void usb_packet_set_state(USBPacket *p, USBPacketState state)
 529 {
 530     if (p->ep) {
 531         USBDevice *dev = p->ep->dev;
 532         USBBus *bus = usb_bus_from_device(dev);
 533         trace_usb_packet_state_change(bus->busnr, dev->port->path, p->ep->nr, p,
 534                                       usb_packet_state_name(p->state),
 535                                       usb_packet_state_name(state));
 536     } else {
 537         trace_usb_packet_state_change(-1, "", -1, p,
 538                                       usb_packet_state_name(p->state),
 539                                       usb_packet_state_name(state));
 540     }
 541     p->state = state;
 542 }
 543
 544 void usb_packet_setup(USBPacket *p, int pid, USBEndpoint *ep, uint64_t id,
 545                       bool short_not_ok, bool int_req)
 546 {
 547     assert(!usb_packet_is_inflight(p));
 548     assert(p->iov.iov != NULL);
 549     p->id = id;
 550     p->pid = pid;
 551     p->ep = ep;
 552     p->status = USB_RET_SUCCESS;
 553     p->actual_length = 0;
 554     p->parameter = 0;
 555     p->short_not_ok = short_not_ok;
 556     p->int_req = int_req;
 557     p->combined = NULL;
 558     qemu_iovec_reset(&p->iov);
 559     usb_packet_set_state(p, USB_PACKET_SETUP);
 560 }
 561
 562 void usb_packet_addbuf(USBPacket *p, void *ptr, size_t len)
 563 {
 564     qemu_iovec_add(&p->iov, ptr, len);
 565 }
 566
 567 void usb_packet_copy(USBPacket *p, void *ptr, size_t bytes)
 568 {
 569     assert(p->actual_length >= 0);
 570     assert(p->actual_length + bytes <= p->iov.size);
 571     switch (p->pid) {
 572     case USB_TOKEN_SETUP:
 573     case USB_TOKEN_OUT:
 574         iov_to_buf(p->iov.iov, p->iov.niov, p->actual_length, ptr, bytes);
 575         break;
 576     case USB_TOKEN_IN:
 577         iov_from_buf(p->iov.iov, p->iov.niov, p->actual_length, ptr, bytes);
 578         break;
 579     default:
 580         fprintf(stderr, "%s: invalid pid: %x\n", __func__, p->pid);
 581         abort();
 582     }
 583     p->actual_length += bytes;
 584 }
 585
 586 void usb_packet_skip(USBPacket *p, size_t bytes)
 587 {
 588     assert(p->actual_length >= 0);
 589     assert(p->actual_length + bytes <= p->iov.size);
 590     if (p->pid == USB_TOKEN_IN) {
 591         iov_memset(p->iov.iov, p->iov.niov, p->actual_length, 0, bytes);
 592     }
 593     p->actual_length += bytes;
 594 }
 595
 596 void usb_packet_cleanup(USBPacket *p)
 597 {
 598     assert(!usb_packet_is_inflight(p));
 599     qemu_iovec_destroy(&p->iov);
 600 }
 601
 602 void usb_ep_reset(USBDevice *dev)
 603 {
 604     int ep;
 605
 606     dev->ep_ctl.nr = 0;
 607     dev->ep_ctl.type = USB_ENDPOINT_XFER_CONTROL;
 608     dev->ep_ctl.ifnum = 0;
 609     dev->ep_ctl.dev = dev;
 610     dev->ep_ctl.pipeline = false;
 611     for (ep = 0; ep < USB_MAX_ENDPOINTS; ep++) {
 612         dev->ep_in[ep].nr = ep + 1;
 613         dev->ep_out[ep].nr = ep + 1;
 614         dev->ep_in[ep].pid = USB_TOKEN_IN;
 615         dev->ep_out[ep].pid = USB_TOKEN_OUT;
 616         dev->ep_in[ep].type = USB_ENDPOINT_XFER_INVALID;
 617         dev->ep_out[ep].type = USB_ENDPOINT_XFER_INVALID;
 618         dev->ep_in[ep].ifnum = USB_INTERFACE_INVALID;
 619         dev->ep_out[ep].ifnum = USB_INTERFACE_INVALID;
 620         dev->ep_in[ep].dev = dev;
 621         dev->ep_out[ep].dev = dev;
 622         dev->ep_in[ep].pipeline = false;
 623         dev->ep_out[ep].pipeline = false;
 624     }
 625 }
 626
 627 void usb_ep_init(USBDevice *dev)
 628 {
 629     int ep;
 630
 631     usb_ep_reset(dev);
 632     QTAILQ_INIT(&dev->ep_ctl.queue);
 633     for (ep = 0; ep < USB_MAX_ENDPOINTS; ep++) {
 634         QTAILQ_INIT(&dev->ep_in[ep].queue);
 635         QTAILQ_INIT(&dev->ep_out[ep].queue);
 636     }
 637 }
 638
 639 void usb_ep_dump(USBDevice *dev)
 640 {
 641     static const char *tname[] = {
 642         [USB_ENDPOINT_XFER_CONTROL] = "control",
 643         [USB_ENDPOINT_XFER_ISOC]    = "isoc",
 644         [USB_ENDPOINT_XFER_BULK]    = "bulk",
 645         [USB_ENDPOINT_XFER_INT]     = "int",
 646     };
 647     int ifnum, ep, first;
 648
 649     fprintf(stderr, "Device \"%s\", config %d\n",
 650             dev->product_desc, dev->configuration);
 651     for (ifnum = 0; ifnum < 16; ifnum++) {
 652         first = 1;
 653         for (ep = 0; ep < USB_MAX_ENDPOINTS; ep++) {
 654             if (dev->ep_in[ep].type != USB_ENDPOINT_XFER_INVALID &&
 655                 dev->ep_in[ep].ifnum == ifnum) {
 656                 if (first) {
 657                     first = 0;
 658                     fprintf(stderr, "  Interface %d, alternative %d\n",
 659                             ifnum, dev->altsetting[ifnum]);
 660                 }
 661                 fprintf(stderr, "    Endpoint %d, IN, %s, %d max\n", ep,
 662                         tname[dev->ep_in[ep].type],
 663                         dev->ep_in[ep].max_packet_size);
 664             }
 665             if (dev->ep_out[ep].type != USB_ENDPOINT_XFER_INVALID &&
 666                 dev->ep_out[ep].ifnum == ifnum) {
 667                 if (first) {
 668                     first = 0;
 669                     fprintf(stderr, "  Interface %d, alternative %d\n",
 670                             ifnum, dev->altsetting[ifnum]);
 671                 }
 672                 fprintf(stderr, "    Endpoint %d, OUT, %s, %d max\n", ep,
 673                         tname[dev->ep_out[ep].type],
 674                         dev->ep_out[ep].max_packet_size);
 675             }
 676         }
 677     }
 678     fprintf(stderr, "--\n");
 679 }
 680
 681 struct USBEndpoint *usb_ep_get(USBDevice *dev, int pid, int ep)
 682 {
 683     struct USBEndpoint *eps;
 684
 685     if (dev == NULL) {
 686         return NULL;
 687     }
 688     eps = (pid == USB_TOKEN_IN) ? dev->ep_in : dev->ep_out;
 689     if (ep == 0) {
 690         return &dev->ep_ctl;
 691     }
 692     assert(pid == USB_TOKEN_IN || pid == USB_TOKEN_OUT);
 693     assert(ep > 0 && ep <= USB_MAX_ENDPOINTS);
 694     return eps + ep - 1;
 695 }
 696
 697 uint8_t usb_ep_get_type(USBDevice *dev, int pid, int ep)
 698 {
 699     struct USBEndpoint *uep = usb_ep_get(dev, pid, ep);
 700     return uep->type;
 701 }
 702
 703 void usb_ep_set_type(USBDevice *dev, int pid, int ep, uint8_t type)
 704 {
 705     struct USBEndpoint *uep = usb_ep_get(dev, pid, ep);
 706     uep->type = type;
 707 }
 708
 709 uint8_t usb_ep_get_ifnum(USBDevice *dev, int pid, int ep)
 710 {
 711     struct USBEndpoint *uep = usb_ep_get(dev, pid, ep);
 712     return uep->ifnum;
 713 }
 714
 715 void usb_ep_set_ifnum(USBDevice *dev, int pid, int ep, uint8_t ifnum)
 716 {
 717     struct USBEndpoint *uep = usb_ep_get(dev, pid, ep);
 718     uep->ifnum = ifnum;
 719 }
 720
 721 void usb_ep_set_max_packet_size(USBDevice *dev, int pid, int ep,
 722                                 uint16_t raw)
 723 {
 724     struct USBEndpoint *uep = usb_ep_get(dev, pid, ep);
 725     int size, microframes;
 726
 727     size = raw & 0x7ff;
 728     switch ((raw >> 11) & 3) {
 729     case 1:
 730         microframes = 2;
 731         break;
 732     case 2:
 733         microframes = 3;
 734         break;
 735     default:
 736         microframes = 1;
 737         break;
 738     }
 739     uep->max_packet_size = size * microframes;
 740 }
 741
 742 int usb_ep_get_max_packet_size(USBDevice *dev, int pid, int ep)
 743 {
 744     struct USBEndpoint *uep = usb_ep_get(dev, pid, ep);
 745     return uep->max_packet_size;
 746 }
 747
 748 void usb_ep_set_pipeline(USBDevice *dev, int pid, int ep, bool enabled)
 749 {
 750     struct USBEndpoint *uep = usb_ep_get(dev, pid, ep);
 751     uep->pipeline = enabled;
 752 }
 753
 754 USBPacket *usb_ep_find_packet_by_id(USBDevice *dev, int pid, int ep,
 755                                     uint64_t id)
 756 {
 757     struct USBEndpoint *uep = usb_ep_get(dev, pid, ep);
 758     USBPacket *p;
 759
 760     while ((p = QTAILQ_FIRST(&uep->queue)) != NULL) {
 761         if (p->id == id) {
 762             return p;
 763         }
 764     }
 765
 766     return NULL;
 767 }