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