hw/usb/bus.c

   1 #include "qemu/osdep.h"
   2 #include "hw/hw.h"
   3 #include "hw/usb.h"
   4 #include "hw/qdev.h"
   5 #include "qapi/error.h"
   6 #include "qemu/error-report.h"
   7 #include "sysemu/sysemu.h"
   8 #include "monitor/monitor.h"
   9 #include "trace.h"
  10
  11 static void usb_bus_dev_print(Monitor *mon, DeviceState *qdev, int indent);
  12
  13 static char *usb_get_dev_path(DeviceState *dev);
  14 static char *usb_get_fw_dev_path(DeviceState *qdev);
  15 static void usb_qdev_unrealize(DeviceState *qdev, Error **errp);
  16
  17 static Property usb_props[] = {
  18     DEFINE_PROP_STRING("port", USBDevice, port_path),
  19     DEFINE_PROP_STRING("serial", USBDevice, serial),
  20     DEFINE_PROP_BIT("full-path", USBDevice, flags,
  21                     USB_DEV_FLAG_FULL_PATH, true),
  22     DEFINE_PROP_BIT("msos-desc", USBDevice, flags,
  23                     USB_DEV_FLAG_MSOS_DESC_ENABLE, true),
  24     DEFINE_PROP_END_OF_LIST()
  25 };
  26
  27 static void usb_bus_class_init(ObjectClass *klass, void *data)
  28 {
  29     BusClass *k = BUS_CLASS(klass);
  30     HotplugHandlerClass *hc = HOTPLUG_HANDLER_CLASS(klass);
  31
  32     k->print_dev = usb_bus_dev_print;
  33     k->get_dev_path = usb_get_dev_path;
  34     k->get_fw_dev_path = usb_get_fw_dev_path;
  35     hc->unplug = qdev_simple_device_unplug_cb;
  36 }
  37
  38 static const TypeInfo usb_bus_info = {
  39     .name = TYPE_USB_BUS,
  40     .parent = TYPE_BUS,
  41     .instance_size = sizeof(USBBus),
  42     .class_init = usb_bus_class_init,
  43     .interfaces = (InterfaceInfo[]) {
  44         { TYPE_HOTPLUG_HANDLER },
  45         { }
  46     }
  47 };
  48
  49 static int next_usb_bus = 0;
  50 static QTAILQ_HEAD(, USBBus) busses = QTAILQ_HEAD_INITIALIZER(busses);
  51
  52 static int usb_device_post_load(void *opaque, int version_id)
  53 {
  54     USBDevice *dev = opaque;
  55
  56     if (dev->state == USB_STATE_NOTATTACHED) {
  57         dev->attached = 0;
  58     } else {
  59         dev->attached = 1;
  60     }
  61     if (dev->setup_index < 0 ||
  62         dev->setup_len < 0 ||
  63         dev->setup_index > dev->setup_len ||
  64         dev->setup_len > sizeof(dev->data_buf)) {
  65         return -EINVAL;
  66     }
  67     return 0;
  68 }
  69
  70 const VMStateDescription vmstate_usb_device = {
  71     .name = "USBDevice",
  72     .version_id = 1,
  73     .minimum_version_id = 1,
  74     .post_load = usb_device_post_load,
  75     .fields = (VMStateField[]) {
  76         VMSTATE_UINT8(addr, USBDevice),
  77         VMSTATE_INT32(state, USBDevice),
  78         VMSTATE_INT32(remote_wakeup, USBDevice),
  79         VMSTATE_INT32(setup_state, USBDevice),
  80         VMSTATE_INT32(setup_len, USBDevice),
  81         VMSTATE_INT32(setup_index, USBDevice),
  82         VMSTATE_UINT8_ARRAY(setup_buf, USBDevice, 8),
  83         VMSTATE_END_OF_LIST(),
  84     }
  85 };
  86
  87 void usb_bus_new(USBBus *bus, size_t bus_size,
  88                  USBBusOps *ops, DeviceState *host)
  89 {
  90     qbus_create_inplace(bus, bus_size, TYPE_USB_BUS, host, NULL);
  91     qbus_set_bus_hotplug_handler(BUS(bus), &error_abort);
  92     bus->ops = ops;
  93     bus->busnr = next_usb_bus++;
  94     QTAILQ_INIT(&bus->free);
  95     QTAILQ_INIT(&bus->used);
  96     QTAILQ_INSERT_TAIL(&busses, bus, next);
  97 }
  98
  99 void usb_bus_release(USBBus *bus)
 100 {
 101     assert(next_usb_bus > 0);
 102
 103     QTAILQ_REMOVE(&busses, bus, next);
 104 }
 105
 106 USBBus *usb_bus_find(int busnr)
 107 {
 108     USBBus *bus;
 109
 110     if (-1 == busnr)
 111         return QTAILQ_FIRST(&busses);
 112     QTAILQ_FOREACH(bus, &busses, next) {
 113         if (bus->busnr == busnr)
 114             return bus;
 115     }
 116     return NULL;
 117 }
 118
 119 static void usb_device_realize(USBDevice *dev, Error **errp)
 120 {
 121     USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
 122
 123     if (klass->realize) {
 124         klass->realize(dev, errp);
 125     }
 126 }
 127
 128 USBDevice *usb_device_find_device(USBDevice *dev, uint8_t addr)
 129 {
 130     USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
 131     if (klass->find_device) {
 132         return klass->find_device(dev, addr);
 133     }
 134     return NULL;
 135 }
 136
 137 static void usb_device_handle_destroy(USBDevice *dev)
 138 {
 139     USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
 140     if (klass->handle_destroy) {
 141         klass->handle_destroy(dev);
 142     }
 143 }
 144
 145 void usb_device_cancel_packet(USBDevice *dev, USBPacket *p)
 146 {
 147     USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
 148     if (klass->cancel_packet) {
 149         klass->cancel_packet(dev, p);
 150     }
 151 }
 152
 153 void usb_device_handle_attach(USBDevice *dev)
 154 {
 155     USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
 156     if (klass->handle_attach) {
 157         klass->handle_attach(dev);
 158     }
 159 }
 160
 161 void usb_device_handle_reset(USBDevice *dev)
 162 {
 163     USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
 164     if (klass->handle_reset) {
 165         klass->handle_reset(dev);
 166     }
 167 }
 168
 169 void usb_device_handle_control(USBDevice *dev, USBPacket *p, int request,
 170                                int value, int index, int length, uint8_t *data)
 171 {
 172     USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
 173     if (klass->handle_control) {
 174         klass->handle_control(dev, p, request, value, index, length, data);
 175     }
 176 }
 177
 178 void usb_device_handle_data(USBDevice *dev, USBPacket *p)
 179 {
 180     USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
 181     if (klass->handle_data) {
 182         klass->handle_data(dev, p);
 183     }
 184 }
 185
 186 const char *usb_device_get_product_desc(USBDevice *dev)
 187 {
 188     USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
 189     return klass->product_desc;
 190 }
 191
 192 const USBDesc *usb_device_get_usb_desc(USBDevice *dev)
 193 {
 194     USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
 195     if (dev->usb_desc) {
 196         return dev->usb_desc;
 197     }
 198     return klass->usb_desc;
 199 }
 200
 201 void usb_device_set_interface(USBDevice *dev, int interface,
 202                               int alt_old, int alt_new)
 203 {
 204     USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
 205     if (klass->set_interface) {
 206         klass->set_interface(dev, interface, alt_old, alt_new);
 207     }
 208 }
 209
 210 void usb_device_flush_ep_queue(USBDevice *dev, USBEndpoint *ep)
 211 {
 212     USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
 213     if (klass->flush_ep_queue) {
 214         klass->flush_ep_queue(dev, ep);
 215     }
 216 }
 217
 218 void usb_device_ep_stopped(USBDevice *dev, USBEndpoint *ep)
 219 {
 220     USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
 221     if (klass->ep_stopped) {
 222         klass->ep_stopped(dev, ep);
 223     }
 224 }
 225
 226 int usb_device_alloc_streams(USBDevice *dev, USBEndpoint **eps, int nr_eps,
 227                              int streams)
 228 {
 229     USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
 230     if (klass->alloc_streams) {
 231         return klass->alloc_streams(dev, eps, nr_eps, streams);
 232     }
 233     return 0;
 234 }
 235
 236 void usb_device_free_streams(USBDevice *dev, USBEndpoint **eps, int nr_eps)
 237 {
 238     USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
 239     if (klass->free_streams) {
 240         klass->free_streams(dev, eps, nr_eps);
 241     }
 242 }
 243
 244 static void usb_qdev_realize(DeviceState *qdev, Error **errp)
 245 {
 246     USBDevice *dev = USB_DEVICE(qdev);
 247     Error *local_err = NULL;
 248
 249     pstrcpy(dev->product_desc, sizeof(dev->product_desc),
 250             usb_device_get_product_desc(dev));
 251     dev->auto_attach = 1;
 252     QLIST_INIT(&dev->strings);
 253     usb_ep_init(dev);
 254
 255     usb_claim_port(dev, &local_err);
 256     if (local_err) {
 257         error_propagate(errp, local_err);
 258         return;
 259     }
 260
 261     usb_device_realize(dev, &local_err);
 262     if (local_err) {
 263         usb_release_port(dev);
 264         error_propagate(errp, local_err);
 265         return;
 266     }
 267
 268     if (dev->auto_attach) {
 269         usb_device_attach(dev, &local_err);
 270         if (local_err) {
 271             usb_qdev_unrealize(qdev, NULL);
 272             error_propagate(errp, local_err);
 273             return;
 274         }
 275     }
 276 }
 277
 278 static void usb_qdev_unrealize(DeviceState *qdev, Error **errp)
 279 {
 280     USBDevice *dev = USB_DEVICE(qdev);
 281
 282     if (dev->attached) {
 283         usb_device_detach(dev);
 284     }
 285     usb_device_handle_destroy(dev);
 286     if (dev->port) {
 287         usb_release_port(dev);
 288     }
 289 }
 290
 291 typedef struct LegacyUSBFactory
 292 {
 293     const char *name;
 294     const char *usbdevice_name;
 295     USBDevice *(*usbdevice_init)(USBBus *bus, const char *params);
 296 } LegacyUSBFactory;
 297
 298 static GSList *legacy_usb_factory;
 299
 300 void usb_legacy_register(const char *typename, const char *usbdevice_name,
 301                          USBDevice *(*usbdevice_init)(USBBus *bus,
 302                                                       const char *params))
 303 {
 304     if (usbdevice_name) {
 305         LegacyUSBFactory *f = g_malloc0(sizeof(*f));
 306         f->name = typename;
 307         f->usbdevice_name = usbdevice_name;
 308         f->usbdevice_init = usbdevice_init;
 309         legacy_usb_factory = g_slist_append(legacy_usb_factory, f);
 310     }
 311 }
 312
 313 USBDevice *usb_create(USBBus *bus, const char *name)
 314 {
 315     DeviceState *dev;
 316
 317     dev = qdev_create(&bus->qbus, name);
 318     return USB_DEVICE(dev);
 319 }
 320
 321 static USBDevice *usb_try_create_simple(USBBus *bus, const char *name,
 322                                         Error **errp)
 323 {
 324     Error *err = NULL;
 325     USBDevice *dev;
 326
 327     dev = USB_DEVICE(qdev_try_create(&bus->qbus, name));
 328     if (!dev) {
 329         error_setg(errp, "Failed to create USB device '%s'", name);
 330         return NULL;
 331     }
 332     object_property_set_bool(OBJECT(dev), true, "realized", &err);
 333     if (err) {
 334         error_propagate(errp, err);
 335         error_prepend(errp, "Failed to initialize USB device '%s': ",
 336                       name);
 337         object_unparent(OBJECT(dev));
 338         return NULL;
 339     }
 340     return dev;
 341 }
 342
 343 USBDevice *usb_create_simple(USBBus *bus, const char *name)
 344 {
 345     return usb_try_create_simple(bus, name, &error_abort);
 346 }
 347
 348 static void usb_fill_port(USBPort *port, void *opaque, int index,
 349                           USBPortOps *ops, int speedmask)
 350 {
 351     port->opaque = opaque;
 352     port->index = index;
 353     port->ops = ops;
 354     port->speedmask = speedmask;
 355     usb_port_location(port, NULL, index + 1);
 356 }
 357
 358 void usb_register_port(USBBus *bus, USBPort *port, void *opaque, int index,
 359                        USBPortOps *ops, int speedmask)
 360 {
 361     usb_fill_port(port, opaque, index, ops, speedmask);
 362     QTAILQ_INSERT_TAIL(&bus->free, port, next);
 363     bus->nfree++;
 364 }
 365
 366 void usb_register_companion(const char *masterbus, USBPort *ports[],
 367                             uint32_t portcount, uint32_t firstport,
 368                             void *opaque, USBPortOps *ops, int speedmask,
 369                             Error **errp)
 370 {
 371     USBBus *bus;
 372     int i;
 373
 374     QTAILQ_FOREACH(bus, &busses, next) {
 375         if (strcmp(bus->qbus.name, masterbus) == 0) {
 376             break;
 377         }
 378     }
 379
 380     if (!bus) {
 381         error_setg(errp, "USB bus '%s' not found", masterbus);
 382         return;
 383     }
 384     if (!bus->ops->register_companion) {
 385         error_setg(errp, "Can't use USB bus '%s' as masterbus,"
 386                    " it doesn't support companion controllers",
 387                    masterbus);
 388         return;
 389     }
 390
 391     for (i = 0; i < portcount; i++) {
 392         usb_fill_port(ports[i], opaque, i, ops, speedmask);
 393     }
 394
 395     bus->ops->register_companion(bus, ports, portcount, firstport, errp);
 396 }
 397
 398 void usb_port_location(USBPort *downstream, USBPort *upstream, int portnr)
 399 {
 400     if (upstream) {
 401         snprintf(downstream->path, sizeof(downstream->path), "%s.%d",
 402                  upstream->path, portnr);
 403         downstream->hubcount = upstream->hubcount + 1;
 404     } else {
 405         snprintf(downstream->path, sizeof(downstream->path), "%d", portnr);
 406         downstream->hubcount = 0;
 407     }
 408 }
 409
 410 void usb_unregister_port(USBBus *bus, USBPort *port)
 411 {
 412     if (port->dev) {
 413         object_unparent(OBJECT(port->dev));
 414     }
 415     QTAILQ_REMOVE(&bus->free, port, next);
 416     bus->nfree--;
 417 }
 418
 419 void usb_claim_port(USBDevice *dev, Error **errp)
 420 {
 421     USBBus *bus = usb_bus_from_device(dev);
 422     USBPort *port;
 423
 424     assert(dev->port == NULL);
 425
 426     if (dev->port_path) {
 427         QTAILQ_FOREACH(port, &bus->free, next) {
 428             if (strcmp(port->path, dev->port_path) == 0) {
 429                 break;
 430             }
 431         }
 432         if (port == NULL) {
 433             error_setg(errp, "usb port %s (bus %s) not found (in use?)",
 434                        dev->port_path, bus->qbus.name);
 435             return;
 436         }
 437     } else {
 438         if (bus->nfree == 1 && strcmp(object_get_typename(OBJECT(dev)), "usb-hub") != 0) {
 439             /* Create a new hub and chain it on */
 440             usb_try_create_simple(bus, "usb-hub", NULL);
 441         }
 442         if (bus->nfree == 0) {
 443             error_setg(errp, "tried to attach usb device %s to a bus "
 444                        "with no free ports", dev->product_desc);
 445             return;
 446         }
 447         port = QTAILQ_FIRST(&bus->free);
 448     }
 449     trace_usb_port_claim(bus->busnr, port->path);
 450
 451     QTAILQ_REMOVE(&bus->free, port, next);
 452     bus->nfree--;
 453
 454     dev->port = port;
 455     port->dev = dev;
 456
 457     QTAILQ_INSERT_TAIL(&bus->used, port, next);
 458     bus->nused++;
 459 }
 460
 461 void usb_release_port(USBDevice *dev)
 462 {
 463     USBBus *bus = usb_bus_from_device(dev);
 464     USBPort *port = dev->port;
 465
 466     assert(port != NULL);
 467     trace_usb_port_release(bus->busnr, port->path);
 468
 469     QTAILQ_REMOVE(&bus->used, port, next);
 470     bus->nused--;
 471
 472     dev->port = NULL;
 473     port->dev = NULL;
 474
 475     QTAILQ_INSERT_TAIL(&bus->free, port, next);
 476     bus->nfree++;
 477 }
 478
 479 static void usb_mask_to_str(char *dest, size_t size,
 480                             unsigned int speedmask)
 481 {
 482     static const struct {
 483         unsigned int mask;
 484         const char *name;
 485     } speeds[] = {
 486         { .mask = USB_SPEED_MASK_FULL,  .name = "full"  },
 487         { .mask = USB_SPEED_MASK_HIGH,  .name = "high"  },
 488         { .mask = USB_SPEED_MASK_SUPER, .name = "super" },
 489     };
 490     int i, pos = 0;
 491
 492     for (i = 0; i < ARRAY_SIZE(speeds); i++) {
 493         if (speeds[i].mask & speedmask) {
 494             pos += snprintf(dest + pos, size - pos, "%s%s",
 495                             pos ? "+" : "",
 496                             speeds[i].name);
 497         }
 498     }
 499 }
 500
 501 void usb_check_attach(USBDevice *dev, Error **errp)
 502 {
 503     USBBus *bus = usb_bus_from_device(dev);
 504     USBPort *port = dev->port;
 505     char devspeed[32], portspeed[32];
 506
 507     assert(port != NULL);
 508     assert(!dev->attached);
 509     usb_mask_to_str(devspeed, sizeof(devspeed), dev->speedmask);
 510     usb_mask_to_str(portspeed, sizeof(portspeed), port->speedmask);
 511     trace_usb_port_attach(bus->busnr, port->path,
 512                           devspeed, portspeed);
 513
 514     if (!(port->speedmask & dev->speedmask)) {
 515         error_setg(errp, "Warning: speed mismatch trying to attach"
 516                    " usb device \"%s\" (%s speed)"
 517                    " to bus \"%s\", port \"%s\" (%s speed)",
 518                    dev->product_desc, devspeed,
 519                    bus->qbus.name, port->path, portspeed);
 520         return;
 521     }
 522 }
 523
 524 void usb_device_attach(USBDevice *dev, Error **errp)
 525 {
 526     USBPort *port = dev->port;
 527     Error *local_err = NULL;
 528
 529     usb_check_attach(dev, &local_err);
 530     if (local_err) {
 531         error_propagate(errp, local_err);
 532         return;
 533     }
 534
 535     dev->attached++;
 536     usb_attach(port);
 537 }
 538
 539 int usb_device_detach(USBDevice *dev)
 540 {
 541     USBBus *bus = usb_bus_from_device(dev);
 542     USBPort *port = dev->port;
 543
 544     assert(port != NULL);
 545     assert(dev->attached);
 546     trace_usb_port_detach(bus->busnr, port->path);
 547
 548     usb_detach(port);
 549     dev->attached--;
 550     return 0;
 551 }
 552
 553 int usb_device_delete_addr(int busnr, int addr)
 554 {
 555     USBBus *bus;
 556     USBPort *port;
 557     USBDevice *dev;
 558
 559     bus = usb_bus_find(busnr);
 560     if (!bus)
 561         return -1;
 562
 563     QTAILQ_FOREACH(port, &bus->used, next) {
 564         if (port->dev->addr == addr)
 565             break;
 566     }
 567     if (!port)
 568         return -1;
 569     dev = port->dev;
 570
 571     object_unparent(OBJECT(dev));
 572     return 0;
 573 }
 574
 575 static const char *usb_speed(unsigned int speed)
 576 {
 577     static const char *txt[] = {
 578         [ USB_SPEED_LOW  ] = "1.5",
 579         [ USB_SPEED_FULL ] = "12",
 580         [ USB_SPEED_HIGH ] = "480",
 581         [ USB_SPEED_SUPER ] = "5000",
 582     };
 583     if (speed >= ARRAY_SIZE(txt))
 584         return "?";
 585     return txt[speed];
 586 }
 587
 588 static void usb_bus_dev_print(Monitor *mon, DeviceState *qdev, int indent)
 589 {
 590     USBDevice *dev = USB_DEVICE(qdev);
 591     USBBus *bus = usb_bus_from_device(dev);
 592
 593     monitor_printf(mon, "%*saddr %d.%d, port %s, speed %s, name %s%s\n",
 594                    indent, "", bus->busnr, dev->addr,
 595                    dev->port ? dev->port->path : "-",
 596                    usb_speed(dev->speed), dev->product_desc,
 597                    dev->attached ? ", attached" : "");
 598 }
 599
 600 static char *usb_get_dev_path(DeviceState *qdev)
 601 {
 602     USBDevice *dev = USB_DEVICE(qdev);
 603     DeviceState *hcd = qdev->parent_bus->parent;
 604     char *id = NULL;
 605
 606     if (dev->flags & (1 << USB_DEV_FLAG_FULL_PATH)) {
 607         id = qdev_get_dev_path(hcd);
 608     }
 609     if (id) {
 610         char *ret = g_strdup_printf("%s/%s", id, dev->port->path);
 611         g_free(id);
 612         return ret;
 613     } else {
 614         return g_strdup(dev->port->path);
 615     }
 616 }
 617
 618 static char *usb_get_fw_dev_path(DeviceState *qdev)
 619 {
 620     USBDevice *dev = USB_DEVICE(qdev);
 621     char *fw_path, *in;
 622     ssize_t pos = 0, fw_len;
 623     long nr;
 624
 625     fw_len = 32 + strlen(dev->port->path) * 6;
 626     fw_path = g_malloc(fw_len);
 627     in = dev->port->path;
 628     while (fw_len - pos > 0) {
 629         nr = strtol(in, &in, 10);
 630         if (in[0] == '.') {
 631             /* some hub between root port and device */
 632             pos += snprintf(fw_path + pos, fw_len - pos, "hub@%lx/", nr);
 633             in++;
 634         } else {
 635             /* the device itself */
 636             pos += snprintf(fw_path + pos, fw_len - pos, "%s@%lx",
 637                             qdev_fw_name(qdev), nr);
 638             break;
 639         }
 640     }
 641     return fw_path;
 642 }
 643
 644 void hmp_info_usb(Monitor *mon, const QDict *qdict)
 645 {
 646     USBBus *bus;
 647     USBDevice *dev;
 648     USBPort *port;
 649
 650     if (QTAILQ_EMPTY(&busses)) {
 651         monitor_printf(mon, "USB support not enabled\n");
 652         return;
 653     }
 654
 655     QTAILQ_FOREACH(bus, &busses, next) {
 656         QTAILQ_FOREACH(port, &bus->used, next) {
 657             dev = port->dev;
 658             if (!dev)
 659                 continue;
 660             monitor_printf(mon, "  Device %d.%d, Port %s, Speed %s Mb/s, "
 661                            "Product %s%s%s\n",
 662                            bus->busnr, dev->addr, port->path,
 663                            usb_speed(dev->speed), dev->product_desc,
 664                            dev->qdev.id ? ", ID: " : "",
 665                            dev->qdev.id ?: "");
 666         }
 667     }
 668 }
 669
 670 /* handle legacy -usbdevice cmd line option */
 671 USBDevice *usbdevice_create(const char *cmdline)
 672 {
 673     USBBus *bus = usb_bus_find(-1 /* any */);
 674     LegacyUSBFactory *f = NULL;
 675     Error *err = NULL;
 676     GSList *i;
 677     char driver[32];
 678     const char *params;
 679     int len;
 680     USBDevice *dev;
 681
 682     params = strchr(cmdline,':');
 683     if (params) {
 684         params++;
 685         len = params - cmdline;
 686         if (len > sizeof(driver))
 687             len = sizeof(driver);
 688         pstrcpy(driver, len, cmdline);
 689     } else {
 690         params = "";
 691         pstrcpy(driver, sizeof(driver), cmdline);
 692     }
 693
 694     for (i = legacy_usb_factory; i; i = i->next) {
 695         f = i->data;
 696         if (strcmp(f->usbdevice_name, driver) == 0) {
 697             break;
 698         }
 699     }
 700     if (i == NULL) {
 701 #if 0
 702         /* no error because some drivers are not converted (yet) */
 703         error_report("usbdevice %s not found", driver);
 704 #endif
 705         return NULL;
 706     }
 707
 708     if (!bus) {
 709         error_report("Error: no usb bus to attach usbdevice %s, "
 710                      "please try -machine usb=on and check that "
 711                      "the machine model supports USB", driver);
 712         return NULL;
 713     }
 714
 715     if (f->usbdevice_init) {
 716         dev = f->usbdevice_init(bus, params);
 717     } else {
 718         if (*params) {
 719             error_report("usbdevice %s accepts no params", driver);
 720             return NULL;
 721         }
 722         dev = usb_create(bus, f->name);
 723     }
 724     if (!dev) {
 725         error_report("Failed to create USB device '%s'", f->name);
 726         return NULL;
 727     }
 728     object_property_set_bool(OBJECT(dev), true, "realized", &err);
 729     if (err) {
 730         error_reportf_err(err, "Failed to initialize USB device '%s': ",
 731                           f->name);
 732         object_unparent(OBJECT(dev));
 733         return NULL;
 734     }
 735     return dev;
 736 }
 737
 738 static void usb_device_class_init(ObjectClass *klass, void *data)
 739 {
 740     DeviceClass *k = DEVICE_CLASS(klass);
 741     k->bus_type = TYPE_USB_BUS;
 742     k->realize  = usb_qdev_realize;
 743     k->unrealize = usb_qdev_unrealize;
 744     k->props    = usb_props;
 745 }
 746
 747 static const TypeInfo usb_device_type_info = {
 748     .name = TYPE_USB_DEVICE,
 749     .parent = TYPE_DEVICE,
 750     .instance_size = sizeof(USBDevice),
 751     .abstract = true,
 752     .class_size = sizeof(USBDeviceClass),
 753     .class_init = usb_device_class_init,
 754 };
 755
 756 static void usb_register_types(void)
 757 {
 758     type_register_static(&usb_bus_info);
 759     type_register_static(&usb_device_type_info);
 760 }
 761
 762 type_init(usb_register_types)