hw/usb.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 "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 int do_token_setup(USBDevice *s, USBPacket *p)
 101 {
 102     int request, value, index;
 103     int ret = 0;
 104
 105     if (p->iov.size != 8) {
 106         return USB_RET_STALL;
 107     }
 108
 109     usb_packet_copy(p, s->setup_buf, p->iov.size);
 110     s->setup_len   = (s->setup_buf[7] << 8) | s->setup_buf[6];
 111     s->setup_index = 0;
 112
 113     request = (s->setup_buf[0] << 8) | s->setup_buf[1];
 114     value   = (s->setup_buf[3] << 8) | s->setup_buf[2];
 115     index   = (s->setup_buf[5] << 8) | s->setup_buf[4];
 116
 117     if (s->setup_buf[0] & USB_DIR_IN) {
 118         ret = usb_device_handle_control(s, p, request, value, index,
 119                                         s->setup_len, s->data_buf);
 120         if (ret == USB_RET_ASYNC) {
 121              s->setup_state = SETUP_STATE_SETUP;
 122              return USB_RET_ASYNC;
 123         }
 124         if (ret < 0)
 125             return ret;
 126
 127         if (ret < s->setup_len)
 128             s->setup_len = ret;
 129         s->setup_state = SETUP_STATE_DATA;
 130     } else {
 131         if (s->setup_len > sizeof(s->data_buf)) {
 132             fprintf(stderr,
 133                 "usb_generic_handle_packet: ctrl buffer too small (%d > %zu)\n",
 134                 s->setup_len, sizeof(s->data_buf));
 135             return USB_RET_STALL;
 136         }
 137         if (s->setup_len == 0)
 138             s->setup_state = SETUP_STATE_ACK;
 139         else
 140             s->setup_state = SETUP_STATE_DATA;
 141     }
 142
 143     return ret;
 144 }
 145
 146 static int do_token_in(USBDevice *s, USBPacket *p)
 147 {
 148     int request, value, index;
 149     int ret = 0;
 150
 151     assert(p->ep->nr == 0);
 152
 153     request = (s->setup_buf[0] << 8) | s->setup_buf[1];
 154     value   = (s->setup_buf[3] << 8) | s->setup_buf[2];
 155     index   = (s->setup_buf[5] << 8) | s->setup_buf[4];
 156
 157     switch(s->setup_state) {
 158     case SETUP_STATE_ACK:
 159         if (!(s->setup_buf[0] & USB_DIR_IN)) {
 160             ret = usb_device_handle_control(s, p, request, value, index,
 161                                             s->setup_len, s->data_buf);
 162             if (ret == USB_RET_ASYNC) {
 163                 return USB_RET_ASYNC;
 164             }
 165             s->setup_state = SETUP_STATE_IDLE;
 166             if (ret > 0)
 167                 return 0;
 168             return ret;
 169         }
 170
 171         /* return 0 byte */
 172         return 0;
 173
 174     case SETUP_STATE_DATA:
 175         if (s->setup_buf[0] & USB_DIR_IN) {
 176             int len = s->setup_len - s->setup_index;
 177             if (len > p->iov.size) {
 178                 len = p->iov.size;
 179             }
 180             usb_packet_copy(p, s->data_buf + s->setup_index, len);
 181             s->setup_index += len;
 182             if (s->setup_index >= s->setup_len)
 183                 s->setup_state = SETUP_STATE_ACK;
 184             return len;
 185         }
 186
 187         s->setup_state = SETUP_STATE_IDLE;
 188         return USB_RET_STALL;
 189
 190     default:
 191         return USB_RET_STALL;
 192     }
 193 }
 194
 195 static int do_token_out(USBDevice *s, USBPacket *p)
 196 {
 197     assert(p->ep->nr == 0);
 198
 199     switch(s->setup_state) {
 200     case SETUP_STATE_ACK:
 201         if (s->setup_buf[0] & USB_DIR_IN) {
 202             s->setup_state = SETUP_STATE_IDLE;
 203             /* transfer OK */
 204         } else {
 205             /* ignore additional output */
 206         }
 207         return 0;
 208
 209     case SETUP_STATE_DATA:
 210         if (!(s->setup_buf[0] & USB_DIR_IN)) {
 211             int len = s->setup_len - s->setup_index;
 212             if (len > p->iov.size) {
 213                 len = p->iov.size;
 214             }
 215             usb_packet_copy(p, s->data_buf + s->setup_index, len);
 216             s->setup_index += len;
 217             if (s->setup_index >= s->setup_len)
 218                 s->setup_state = SETUP_STATE_ACK;
 219             return len;
 220         }
 221
 222         s->setup_state = SETUP_STATE_IDLE;
 223         return USB_RET_STALL;
 224
 225     default:
 226         return USB_RET_STALL;
 227     }
 228 }
 229
 230 static int do_parameter(USBDevice *s, USBPacket *p)
 231 {
 232     int request, value, index;
 233     int i, ret = 0;
 234
 235     for (i = 0; i < 8; i++) {
 236         s->setup_buf[i] = p->parameter >> (i*8);
 237     }
 238
 239     s->setup_state = SETUP_STATE_PARAM;
 240     s->setup_len   = (s->setup_buf[7] << 8) | s->setup_buf[6];
 241     s->setup_index = 0;
 242
 243     request = (s->setup_buf[0] << 8) | s->setup_buf[1];
 244     value   = (s->setup_buf[3] << 8) | s->setup_buf[2];
 245     index   = (s->setup_buf[5] << 8) | s->setup_buf[4];
 246
 247     if (s->setup_len > sizeof(s->data_buf)) {
 248         fprintf(stderr,
 249                 "usb_generic_handle_packet: ctrl buffer too small (%d > %zu)\n",
 250                 s->setup_len, sizeof(s->data_buf));
 251         return USB_RET_STALL;
 252     }
 253
 254     if (p->pid == USB_TOKEN_OUT) {
 255         usb_packet_copy(p, s->data_buf, s->setup_len);
 256     }
 257
 258     ret = usb_device_handle_control(s, p, request, value, index,
 259                                     s->setup_len, s->data_buf);
 260     if (ret < 0) {
 261         return ret;
 262     }
 263
 264     if (ret < s->setup_len) {
 265         s->setup_len = ret;
 266     }
 267     if (p->pid == USB_TOKEN_IN) {
 268         usb_packet_copy(p, s->data_buf, s->setup_len);
 269     }
 270
 271     return ret;
 272 }
 273
 274 /* ctrl complete function for devices which use usb_generic_handle_packet and
 275    may return USB_RET_ASYNC from their handle_control callback. Device code
 276    which does this *must* call this function instead of the normal
 277    usb_packet_complete to complete their async control packets. */
 278 void usb_generic_async_ctrl_complete(USBDevice *s, USBPacket *p)
 279 {
 280     if (p->result < 0) {
 281         s->setup_state = SETUP_STATE_IDLE;
 282     }
 283
 284     switch (s->setup_state) {
 285     case SETUP_STATE_SETUP:
 286         if (p->result < s->setup_len) {
 287             s->setup_len = p->result;
 288         }
 289         s->setup_state = SETUP_STATE_DATA;
 290         p->result = 8;
 291         break;
 292
 293     case SETUP_STATE_ACK:
 294         s->setup_state = SETUP_STATE_IDLE;
 295         p->result = 0;
 296         break;
 297
 298     case SETUP_STATE_PARAM:
 299         if (p->result < s->setup_len) {
 300             s->setup_len = p->result;
 301         }
 302         if (p->pid == USB_TOKEN_IN) {
 303             p->result = 0;
 304             usb_packet_copy(p, s->data_buf, s->setup_len);
 305         }
 306         break;
 307
 308     default:
 309         break;
 310     }
 311     usb_packet_complete(s, p);
 312 }
 313
 314 /* XXX: fix overflow */
 315 int set_usb_string(uint8_t *buf, const char *str)
 316 {
 317     int len, i;
 318     uint8_t *q;
 319
 320     q = buf;
 321     len = strlen(str);
 322     *q++ = 2 * len + 2;
 323     *q++ = 3;
 324     for(i = 0; i < len; i++) {
 325         *q++ = str[i];
 326         *q++ = 0;
 327     }
 328     return q - buf;
 329 }
 330
 331 USBDevice *usb_find_device(USBPort *port, uint8_t addr)
 332 {
 333     USBDevice *dev = port->dev;
 334
 335     if (dev == NULL || !dev->attached || dev->state != USB_STATE_DEFAULT) {
 336         return NULL;
 337     }
 338     if (dev->addr == addr) {
 339         return dev;
 340     }
 341     return usb_device_find_device(dev, addr);
 342 }
 343
 344 static int usb_process_one(USBPacket *p)
 345 {
 346     USBDevice *dev = p->ep->dev;
 347
 348     if (p->ep->nr == 0) {
 349         /* control pipe */
 350         if (p->parameter) {
 351             return do_parameter(dev, p);
 352         }
 353         switch (p->pid) {
 354         case USB_TOKEN_SETUP:
 355             return do_token_setup(dev, p);
 356         case USB_TOKEN_IN:
 357             return do_token_in(dev, p);
 358         case USB_TOKEN_OUT:
 359             return do_token_out(dev, p);
 360         default:
 361             return USB_RET_STALL;
 362         }
 363     } else {
 364         /* data pipe */
 365         return usb_device_handle_data(dev, p);
 366     }
 367 }
 368
 369 /* Hand over a packet to a device for processing.  Return value
 370    USB_RET_ASYNC indicates the processing isn't finished yet, the
 371    driver will call usb_packet_complete() when done processing it. */
 372 int usb_handle_packet(USBDevice *dev, USBPacket *p)
 373 {
 374     int ret;
 375
 376     if (dev == NULL) {
 377         return USB_RET_NODEV;
 378     }
 379     assert(dev == p->ep->dev);
 380     assert(dev->state == USB_STATE_DEFAULT);
 381     assert(p->state == USB_PACKET_SETUP);
 382     assert(p->ep != NULL);
 383
 384     if (QTAILQ_EMPTY(&p->ep->queue) || p->ep->pipeline) {
 385         ret = usb_process_one(p);
 386         if (ret == USB_RET_ASYNC) {
 387             usb_packet_set_state(p, USB_PACKET_ASYNC);
 388             QTAILQ_INSERT_TAIL(&p->ep->queue, p, queue);
 389         } else {
 390             p->result = ret;
 391             usb_packet_set_state(p, USB_PACKET_COMPLETE);
 392         }
 393     } else {
 394         ret = USB_RET_ASYNC;
 395         usb_packet_set_state(p, USB_PACKET_QUEUED);
 396         QTAILQ_INSERT_TAIL(&p->ep->queue, p, queue);
 397     }
 398     return ret;
 399 }
 400
 401 /* Notify the controller that an async packet is complete.  This should only
 402    be called for packets previously deferred by returning USB_RET_ASYNC from
 403    handle_packet. */
 404 void usb_packet_complete(USBDevice *dev, USBPacket *p)
 405 {
 406     USBEndpoint *ep = p->ep;
 407     int ret;
 408
 409     assert(p->state == USB_PACKET_ASYNC);
 410     assert(QTAILQ_FIRST(&ep->queue) == p);
 411     usb_packet_set_state(p, USB_PACKET_COMPLETE);
 412     QTAILQ_REMOVE(&ep->queue, p, queue);
 413     dev->port->ops->complete(dev->port, p);
 414
 415     while (!QTAILQ_EMPTY(&ep->queue)) {
 416         p = QTAILQ_FIRST(&ep->queue);
 417         if (p->state == USB_PACKET_ASYNC) {
 418             break;
 419         }
 420         assert(p->state == USB_PACKET_QUEUED);
 421         ret = usb_process_one(p);
 422         if (ret == USB_RET_ASYNC) {
 423             usb_packet_set_state(p, USB_PACKET_ASYNC);
 424             break;
 425         }
 426         p->result = ret;
 427         usb_packet_set_state(p, USB_PACKET_COMPLETE);
 428         QTAILQ_REMOVE(&ep->queue, p, queue);
 429         dev->port->ops->complete(dev->port, p);
 430     }
 431 }
 432
 433 /* Cancel an active packet.  The packed must have been deferred by
 434    returning USB_RET_ASYNC from handle_packet, and not yet
 435    completed.  */
 436 void usb_cancel_packet(USBPacket * p)
 437 {
 438     bool callback = (p->state == USB_PACKET_ASYNC);
 439     assert(usb_packet_is_inflight(p));
 440     usb_packet_set_state(p, USB_PACKET_CANCELED);
 441     QTAILQ_REMOVE(&p->ep->queue, p, queue);
 442     if (callback) {
 443         usb_device_cancel_packet(p->ep->dev, p);
 444     }
 445 }
 446
 447
 448 void usb_packet_init(USBPacket *p)
 449 {
 450     qemu_iovec_init(&p->iov, 1);
 451 }
 452
 453 void usb_packet_set_state(USBPacket *p, USBPacketState state)
 454 {
 455     static const char *name[] = {
 456         [USB_PACKET_UNDEFINED] = "undef",
 457         [USB_PACKET_SETUP]     = "setup",
 458         [USB_PACKET_QUEUED]    = "queued",
 459         [USB_PACKET_ASYNC]     = "async",
 460         [USB_PACKET_COMPLETE]  = "complete",
 461         [USB_PACKET_CANCELED]  = "canceled",
 462     };
 463     USBDevice *dev = p->ep->dev;
 464     USBBus *bus = usb_bus_from_device(dev);
 465
 466     trace_usb_packet_state_change(bus->busnr, dev->port->path, p->ep->nr,
 467                                   p, name[p->state], name[state]);
 468     p->state = state;
 469 }
 470
 471 void usb_packet_setup(USBPacket *p, int pid, USBEndpoint *ep)
 472 {
 473     assert(!usb_packet_is_inflight(p));
 474     p->pid = pid;
 475     p->ep = ep;
 476     p->result = 0;
 477     p->parameter = 0;
 478     qemu_iovec_reset(&p->iov);
 479     usb_packet_set_state(p, USB_PACKET_SETUP);
 480 }
 481
 482 void usb_packet_addbuf(USBPacket *p, void *ptr, size_t len)
 483 {
 484     qemu_iovec_add(&p->iov, ptr, len);
 485 }
 486
 487 void usb_packet_copy(USBPacket *p, void *ptr, size_t bytes)
 488 {
 489     assert(p->result >= 0);
 490     assert(p->result + bytes <= p->iov.size);
 491     switch (p->pid) {
 492     case USB_TOKEN_SETUP:
 493     case USB_TOKEN_OUT:
 494         iov_to_buf(p->iov.iov, p->iov.niov, ptr, p->result, bytes);
 495         break;
 496     case USB_TOKEN_IN:
 497         iov_from_buf(p->iov.iov, p->iov.niov, ptr, p->result, bytes);
 498         break;
 499     default:
 500         fprintf(stderr, "%s: invalid pid: %x\n", __func__, p->pid);
 501         abort();
 502     }
 503     p->result += bytes;
 504 }
 505
 506 void usb_packet_skip(USBPacket *p, size_t bytes)
 507 {
 508     assert(p->result >= 0);
 509     assert(p->result + bytes <= p->iov.size);
 510     if (p->pid == USB_TOKEN_IN) {
 511         iov_clear(p->iov.iov, p->iov.niov, p->result, bytes);
 512     }
 513     p->result += bytes;
 514 }
 515
 516 void usb_packet_cleanup(USBPacket *p)
 517 {
 518     assert(!usb_packet_is_inflight(p));
 519     qemu_iovec_destroy(&p->iov);
 520 }
 521
 522 void usb_ep_init(USBDevice *dev)
 523 {
 524     int ep;
 525
 526     dev->ep_ctl.nr = 0;
 527     dev->ep_ctl.type = USB_ENDPOINT_XFER_CONTROL;
 528     dev->ep_ctl.ifnum = 0;
 529     dev->ep_ctl.dev = dev;
 530     dev->ep_ctl.pipeline = false;
 531     QTAILQ_INIT(&dev->ep_ctl.queue);
 532     for (ep = 0; ep < USB_MAX_ENDPOINTS; ep++) {
 533         dev->ep_in[ep].nr = ep + 1;
 534         dev->ep_out[ep].nr = ep + 1;
 535         dev->ep_in[ep].pid = USB_TOKEN_IN;
 536         dev->ep_out[ep].pid = USB_TOKEN_OUT;
 537         dev->ep_in[ep].type = USB_ENDPOINT_XFER_INVALID;
 538         dev->ep_out[ep].type = USB_ENDPOINT_XFER_INVALID;
 539         dev->ep_in[ep].ifnum = 0;
 540         dev->ep_out[ep].ifnum = 0;
 541         dev->ep_in[ep].dev = dev;
 542         dev->ep_out[ep].dev = dev;
 543         dev->ep_in[ep].pipeline = false;
 544         dev->ep_out[ep].pipeline = false;
 545         QTAILQ_INIT(&dev->ep_in[ep].queue);
 546         QTAILQ_INIT(&dev->ep_out[ep].queue);
 547     }
 548 }
 549
 550 void usb_ep_dump(USBDevice *dev)
 551 {
 552     static const char *tname[] = {
 553         [USB_ENDPOINT_XFER_CONTROL] = "control",
 554         [USB_ENDPOINT_XFER_ISOC]    = "isoc",
 555         [USB_ENDPOINT_XFER_BULK]    = "bulk",
 556         [USB_ENDPOINT_XFER_INT]     = "int",
 557     };
 558     int ifnum, ep, first;
 559
 560     fprintf(stderr, "Device \"%s\", config %d\n",
 561             dev->product_desc, dev->configuration);
 562     for (ifnum = 0; ifnum < 16; ifnum++) {
 563         first = 1;
 564         for (ep = 0; ep < USB_MAX_ENDPOINTS; ep++) {
 565             if (dev->ep_in[ep].type != USB_ENDPOINT_XFER_INVALID &&
 566                 dev->ep_in[ep].ifnum == ifnum) {
 567                 if (first) {
 568                     first = 0;
 569                     fprintf(stderr, "  Interface %d, alternative %d\n",
 570                             ifnum, dev->altsetting[ifnum]);
 571                 }
 572                 fprintf(stderr, "    Endpoint %d, IN, %s, %d max\n", ep,
 573                         tname[dev->ep_in[ep].type],
 574                         dev->ep_in[ep].max_packet_size);
 575             }
 576             if (dev->ep_out[ep].type != USB_ENDPOINT_XFER_INVALID &&
 577                 dev->ep_out[ep].ifnum == ifnum) {
 578                 if (first) {
 579                     first = 0;
 580                     fprintf(stderr, "  Interface %d, alternative %d\n",
 581                             ifnum, dev->altsetting[ifnum]);
 582                 }
 583                 fprintf(stderr, "    Endpoint %d, OUT, %s, %d max\n", ep,
 584                         tname[dev->ep_out[ep].type],
 585                         dev->ep_out[ep].max_packet_size);
 586             }
 587         }
 588     }
 589     fprintf(stderr, "--\n");
 590 }
 591
 592 struct USBEndpoint *usb_ep_get(USBDevice *dev, int pid, int ep)
 593 {
 594     struct USBEndpoint *eps;
 595
 596     if (dev == NULL) {
 597         return NULL;
 598     }
 599     eps = (pid == USB_TOKEN_IN) ? dev->ep_in : dev->ep_out;
 600     if (ep == 0) {
 601         return &dev->ep_ctl;
 602     }
 603     assert(pid == USB_TOKEN_IN || pid == USB_TOKEN_OUT);
 604     assert(ep > 0 && ep <= USB_MAX_ENDPOINTS);
 605     return eps + ep - 1;
 606 }
 607
 608 uint8_t usb_ep_get_type(USBDevice *dev, int pid, int ep)
 609 {
 610     struct USBEndpoint *uep = usb_ep_get(dev, pid, ep);
 611     return uep->type;
 612 }
 613
 614 void usb_ep_set_type(USBDevice *dev, int pid, int ep, uint8_t type)
 615 {
 616     struct USBEndpoint *uep = usb_ep_get(dev, pid, ep);
 617     uep->type = type;
 618 }
 619
 620 uint8_t usb_ep_get_ifnum(USBDevice *dev, int pid, int ep)
 621 {
 622     struct USBEndpoint *uep = usb_ep_get(dev, pid, ep);
 623     return uep->ifnum;
 624 }
 625
 626 void usb_ep_set_ifnum(USBDevice *dev, int pid, int ep, uint8_t ifnum)
 627 {
 628     struct USBEndpoint *uep = usb_ep_get(dev, pid, ep);
 629     uep->ifnum = ifnum;
 630 }
 631
 632 void usb_ep_set_max_packet_size(USBDevice *dev, int pid, int ep,
 633                                 uint16_t raw)
 634 {
 635     struct USBEndpoint *uep = usb_ep_get(dev, pid, ep);
 636     int size, microframes;
 637
 638     size = raw & 0x7ff;
 639     switch ((raw >> 11) & 3) {
 640     case 1:
 641         microframes = 2;
 642         break;
 643     case 2:
 644         microframes = 3;
 645         break;
 646     default:
 647         microframes = 1;
 648         break;
 649     }
 650     uep->max_packet_size = size * microframes;
 651 }
 652
 653 int usb_ep_get_max_packet_size(USBDevice *dev, int pid, int ep)
 654 {
 655     struct USBEndpoint *uep = usb_ep_get(dev, pid, ep);
 656     return uep->max_packet_size;
 657 }
 658
 659 void usb_ep_set_pipeline(USBDevice *dev, int pid, int ep, bool enabled)
 660 {
 661     struct USBEndpoint *uep = usb_ep_get(dev, pid, ep);
 662     uep->pipeline = enabled;
 663 }