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 #include "migration/migration.h"
  12
  13 static void usb_bus_dev_print(Monitor *mon, DeviceState *qdev, int indent);
  14
  15 static char *usb_get_dev_path(DeviceState *dev);
  16 static char *usb_get_fw_dev_path(DeviceState *qdev);
  17 static void usb_qdev_unrealize(DeviceState *qdev, Error **errp);
  18
  19 static Property usb_props[] = {
  20     DEFINE_PROP_STRING("port", USBDevice, port_path),
  21     DEFINE_PROP_STRING("serial", USBDevice, serial),
  22     DEFINE_PROP_BIT("full-path", USBDevice, flags,
  23                     USB_DEV_FLAG_FULL_PATH, true),
  24     DEFINE_PROP_BIT("msos-desc", USBDevice, flags,
  25                     USB_DEV_FLAG_MSOS_DESC_ENABLE, true),
  26     DEFINE_PROP_END_OF_LIST()
  27 };
  28
  29 static void usb_bus_class_init(ObjectClass *klass, void *data)
  30 {
  31     BusClass *k = BUS_CLASS(klass);
  32     HotplugHandlerClass *hc = HOTPLUG_HANDLER_CLASS(klass);
  33
  34     k->print_dev = usb_bus_dev_print;
  35     k->get_dev_path = usb_get_dev_path;
  36     k->get_fw_dev_path = usb_get_fw_dev_path;
  37     hc->unplug = qdev_simple_device_unplug_cb;
  38 }
  39
  40 static const TypeInfo usb_bus_info = {
  41     .name = TYPE_USB_BUS,
  42     .parent = TYPE_BUS,
  43     .instance_size = sizeof(USBBus),
  44     .class_init = usb_bus_class_init,
  45     .interfaces = (InterfaceInfo[]) {
  46         { TYPE_HOTPLUG_HANDLER },
  47         { }
  48     }
  49 };
  50
  51 static int next_usb_bus = 0;
  52 static QTAILQ_HEAD(, USBBus) busses = QTAILQ_HEAD_INITIALIZER(busses);
  53
  54 static int usb_device_post_load(void *opaque, int version_id)
  55 {
  56     USBDevice *dev = opaque;
  57
  58     if (dev->state == USB_STATE_NOTATTACHED) {
  59         dev->attached = false;
  60     } else {
  61         dev->attached = true;
  62     }
  63     if (dev->setup_index < 0 ||
  64         dev->setup_len < 0 ||
  65         dev->setup_index > dev->setup_len ||
  66         dev->setup_len > sizeof(dev->data_buf)) {
  67         return -EINVAL;
  68     }
  69     return 0;
  70 }
  71
  72 const VMStateDescription vmstate_usb_device = {
  73     .name = "USBDevice",
  74     .version_id = 1,
  75     .minimum_version_id = 1,
  76     .post_load = usb_device_post_load,
  77     .fields = (VMStateField[]) {
  78         VMSTATE_UINT8(addr, USBDevice),
  79         VMSTATE_INT32(state, USBDevice),
  80         VMSTATE_INT32(remote_wakeup, USBDevice),
  81         VMSTATE_INT32(setup_state, USBDevice),
  82         VMSTATE_INT32(setup_len, USBDevice),
  83         VMSTATE_INT32(setup_index, USBDevice),
  84         VMSTATE_UINT8_ARRAY(setup_buf, USBDevice, 8),
  85         VMSTATE_END_OF_LIST(),
  86     }
  87 };
  88
  89 void usb_bus_new(USBBus *bus, size_t bus_size,
  90                  USBBusOps *ops, DeviceState *host)
  91 {
  92     qbus_create_inplace(bus, bus_size, TYPE_USB_BUS, host, NULL);
  93     qbus_set_bus_hotplug_handler(BUS(bus), &error_abort);
  94     bus->ops = ops;
  95     bus->busnr = next_usb_bus++;
  96     QTAILQ_INIT(&bus->free);
  97     QTAILQ_INIT(&bus->used);
  98     QTAILQ_INSERT_TAIL(&busses, bus, next);
  99 }
 100
 101 void usb_bus_release(USBBus *bus)
 102 {
 103     assert(next_usb_bus > 0);
 104
 105     QTAILQ_REMOVE(&busses, bus, next);
 106 }
 107
 108 USBBus *usb_bus_find(int busnr)
 109 {
 110     USBBus *bus;
 111
 112     if (-1 == busnr)
 113         return QTAILQ_FIRST(&busses);
 114     QTAILQ_FOREACH(bus, &busses, next) {
 115         if (bus->busnr == busnr)
 116             return bus;
 117     }
 118     return NULL;
 119 }
 120
 121 static void usb_device_realize(USBDevice *dev, Error **errp)
 122 {
 123     USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
 124
 125     if (klass->realize) {
 126         klass->realize(dev, errp);
 127     }
 128 }
 129
 130 USBDevice *usb_device_find_device(USBDevice *dev, uint8_t addr)
 131 {
 132     USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
 133     if (klass->find_device) {
 134         return klass->find_device(dev, addr);
 135     }
 136     return NULL;
 137 }
 138
 139 static void usb_device_handle_destroy(USBDevice *dev)
 140 {
 141     USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
 142     if (klass->handle_destroy) {
 143         klass->handle_destroy(dev);
 144     }
 145 }
 146
 147 void usb_device_cancel_packet(USBDevice *dev, USBPacket *p)
 148 {
 149     USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
 150     if (klass->cancel_packet) {
 151         klass->cancel_packet(dev, p);
 152     }
 153 }
 154
 155 void usb_device_handle_attach(USBDevice *dev)
 156 {
 157     USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
 158     if (klass->handle_attach) {
 159         klass->handle_attach(dev);
 160     }
 161 }
 162
 163 void usb_device_handle_reset(USBDevice *dev)
 164 {
 165     USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
 166     if (klass->handle_reset) {
 167         klass->handle_reset(dev);
 168     }
 169 }
 170
 171 void usb_device_handle_control(USBDevice *dev, USBPacket *p, int request,
 172                                int value, int index, int length, uint8_t *data)
 173 {
 174     USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
 175     if (klass->handle_control) {
 176         klass->handle_control(dev, p, request, value, index, length, data);
 177     }
 178 }
 179
 180 void usb_device_handle_data(USBDevice *dev, USBPacket *p)
 181 {
 182     USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
 183     if (klass->handle_data) {
 184         klass->handle_data(dev, p);
 185     }
 186 }
 187
 188 const char *usb_device_get_product_desc(USBDevice *dev)
 189 {
 190     USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
 191     return klass->product_desc;
 192 }
 193
 194 const USBDesc *usb_device_get_usb_desc(USBDevice *dev)
 195 {
 196     USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
 197     if (dev->usb_desc) {
 198         return dev->usb_desc;
 199     }
 200     return klass->usb_desc;
 201 }
 202
 203 void usb_device_set_interface(USBDevice *dev, int interface,
 204                               int alt_old, int alt_new)
 205 {
 206     USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
 207     if (klass->set_interface) {
 208         klass->set_interface(dev, interface, alt_old, alt_new);
 209     }
 210 }
 211
 212 void usb_device_flush_ep_queue(USBDevice *dev, USBEndpoint *ep)
 213 {
 214     USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
 215     if (klass->flush_ep_queue) {
 216         klass->flush_ep_queue(dev, ep);
 217     }
 218 }
 219
 220 void usb_device_ep_stopped(USBDevice *dev, USBEndpoint *ep)
 221 {
 222     USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
 223     if (klass->ep_stopped) {
 224         klass->ep_stopped(dev, ep);
 225     }
 226 }
 227
 228 int usb_device_alloc_streams(USBDevice *dev, USBEndpoint **eps, int nr_eps,
 229                              int streams)
 230 {
 231     USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
 232     if (klass->alloc_streams) {
 233         return klass->alloc_streams(dev, eps, nr_eps, streams);
 234     }
 235     return 0;
 236 }
 237
 238 void usb_device_free_streams(USBDevice *dev, USBEndpoint **eps, int nr_eps)
 239 {
 240     USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
 241     if (klass->free_streams) {
 242         klass->free_streams(dev, eps, nr_eps);
 243     }
 244 }
 245
 246 static void usb_qdev_realize(DeviceState *qdev, Error **errp)
 247 {
 248     USBDevice *dev = USB_DEVICE(qdev);
 249     Error *local_err = NULL;
 250
 251     pstrcpy(dev->product_desc, sizeof(dev->product_desc),
 252             usb_device_get_product_desc(dev));
 253     dev->auto_attach = 1;
 254     QLIST_INIT(&dev->strings);
 255     usb_ep_init(dev);
 256
 257     usb_claim_port(dev, &local_err);
 258     if (local_err) {
 259         error_propagate(errp, local_err);
 260         return;
 261     }
 262
 263     usb_device_realize(dev, &local_err);
 264     if (local_err) {
 265         usb_release_port(dev);
 266         error_propagate(errp, local_err);
 267         return;
 268     }
 269
 270     if (dev->auto_attach) {
 271         usb_device_attach(dev, &local_err);
 272         if (local_err) {
 273             usb_qdev_unrealize(qdev, NULL);
 274             error_propagate(errp, local_err);
 275             return;
 276         }
 277     }
 278 }
 279
 280 static void usb_qdev_unrealize(DeviceState *qdev, Error **errp)
 281 {
 282     USBDevice *dev = USB_DEVICE(qdev);
 283     USBDescString *s, *next;
 284
 285     QLIST_FOREACH_SAFE(s, &dev->strings, next, next) {
 286         QLIST_REMOVE(s, next);
 287         g_free(s->str);
 288         g_free(s);
 289     }
 290
 291     if (dev->attached) {
 292         usb_device_detach(dev);
 293     }
 294     usb_device_handle_destroy(dev);
 295     if (dev->port) {
 296         usb_release_port(dev);
 297     }
 298 }
 299
 300 typedef struct LegacyUSBFactory
 301 {
 302     const char *name;
 303     const char *usbdevice_name;
 304     USBDevice *(*usbdevice_init)(USBBus *bus, const char *params);
 305 } LegacyUSBFactory;
 306
 307 static GSList *legacy_usb_factory;
 308
 309 void usb_legacy_register(const char *typename, const char *usbdevice_name,
 310                          USBDevice *(*usbdevice_init)(USBBus *bus,
 311                                                       const char *params))
 312 {
 313     if (usbdevice_name) {
 314         LegacyUSBFactory *f = g_malloc0(sizeof(*f));
 315         f->name = typename;
 316         f->usbdevice_name = usbdevice_name;
 317         f->usbdevice_init = usbdevice_init;
 318         legacy_usb_factory = g_slist_append(legacy_usb_factory, f);
 319     }
 320 }
 321
 322 USBDevice *usb_create(USBBus *bus, const char *name)
 323 {
 324     DeviceState *dev;
 325
 326     dev = qdev_create(&bus->qbus, name);
 327     return USB_DEVICE(dev);
 328 }
 329
 330 static USBDevice *usb_try_create_simple(USBBus *bus, const char *name,
 331                                         Error **errp)
 332 {
 333     Error *err = NULL;
 334     USBDevice *dev;
 335
 336     dev = USB_DEVICE(qdev_try_create(&bus->qbus, name));
 337     if (!dev) {
 338         error_setg(errp, "Failed to create USB device '%s'", name);
 339         return NULL;
 340     }
 341     object_property_set_bool(OBJECT(dev), true, "realized", &err);
 342     if (err) {
 343         error_propagate(errp, err);
 344         error_prepend(errp, "Failed to initialize USB device '%s': ",
 345                       name);
 346         object_unparent(OBJECT(dev));
 347         return NULL;
 348     }
 349     return dev;
 350 }
 351
 352 USBDevice *usb_create_simple(USBBus *bus, const char *name)
 353 {
 354     return usb_try_create_simple(bus, name, &error_abort);
 355 }
 356
 357 static void usb_fill_port(USBPort *port, void *opaque, int index,
 358                           USBPortOps *ops, int speedmask)
 359 {
 360     port->opaque = opaque;
 361     port->index = index;
 362     port->ops = ops;
 363     port->speedmask = speedmask;
 364     usb_port_location(port, NULL, index + 1);
 365 }
 366
 367 void usb_register_port(USBBus *bus, USBPort *port, void *opaque, int index,
 368                        USBPortOps *ops, int speedmask)
 369 {
 370     usb_fill_port(port, opaque, index, ops, speedmask);
 371     QTAILQ_INSERT_TAIL(&bus->free, port, next);
 372     bus->nfree++;
 373 }
 374
 375 void usb_register_companion(const char *masterbus, USBPort *ports[],
 376                             uint32_t portcount, uint32_t firstport,
 377                             void *opaque, USBPortOps *ops, int speedmask,
 378                             Error **errp)
 379 {
 380     USBBus *bus;
 381     int i;
 382
 383     QTAILQ_FOREACH(bus, &busses, next) {
 384         if (strcmp(bus->qbus.name, masterbus) == 0) {
 385             break;
 386         }
 387     }
 388
 389     if (!bus) {
 390         error_setg(errp, "USB bus '%s' not found", masterbus);
 391         return;
 392     }
 393     if (!bus->ops->register_companion) {
 394         error_setg(errp, "Can't use USB bus '%s' as masterbus,"
 395                    " it doesn't support companion controllers",
 396                    masterbus);
 397         return;
 398     }
 399
 400     for (i = 0; i < portcount; i++) {
 401         usb_fill_port(ports[i], opaque, i, ops, speedmask);
 402     }
 403
 404     bus->ops->register_companion(bus, ports, portcount, firstport, errp);
 405 }
 406
 407 void usb_port_location(USBPort *downstream, USBPort *upstream, int portnr)
 408 {
 409     if (upstream) {
 410         snprintf(downstream->path, sizeof(downstream->path), "%s.%d",
 411                  upstream->path, portnr);
 412         downstream->hubcount = upstream->hubcount + 1;
 413     } else {
 414         snprintf(downstream->path, sizeof(downstream->path), "%d", portnr);
 415         downstream->hubcount = 0;
 416     }
 417 }
 418
 419 void usb_unregister_port(USBBus *bus, USBPort *port)
 420 {
 421     if (port->dev) {
 422         object_unparent(OBJECT(port->dev));
 423     }
 424     QTAILQ_REMOVE(&bus->free, port, next);
 425     bus->nfree--;
 426 }
 427
 428 void usb_claim_port(USBDevice *dev, Error **errp)
 429 {
 430     USBBus *bus = usb_bus_from_device(dev);
 431     USBPort *port;
 432
 433     assert(dev->port == NULL);
 434
 435     if (dev->port_path) {
 436         QTAILQ_FOREACH(port, &bus->free, next) {
 437             if (strcmp(port->path, dev->port_path) == 0) {
 438                 break;
 439             }
 440         }
 441         if (port == NULL) {
 442             error_setg(errp, "usb port %s (bus %s) not found (in use?)",
 443                        dev->port_path, bus->qbus.name);
 444             return;
 445         }
 446     } else {
 447         if (bus->nfree == 1 && strcmp(object_get_typename(OBJECT(dev)), "usb-hub") != 0) {
 448             /* Create a new hub and chain it on */
 449             usb_try_create_simple(bus, "usb-hub", NULL);
 450         }
 451         if (bus->nfree == 0) {
 452             error_setg(errp, "tried to attach usb device %s to a bus "
 453                        "with no free ports", dev->product_desc);
 454             return;
 455         }
 456         port = QTAILQ_FIRST(&bus->free);
 457     }
 458     trace_usb_port_claim(bus->busnr, port->path);
 459
 460     QTAILQ_REMOVE(&bus->free, port, next);
 461     bus->nfree--;
 462
 463     dev->port = port;
 464     port->dev = dev;
 465
 466     QTAILQ_INSERT_TAIL(&bus->used, port, next);
 467     bus->nused++;
 468 }
 469
 470 void usb_release_port(USBDevice *dev)
 471 {
 472     USBBus *bus = usb_bus_from_device(dev);
 473     USBPort *port = dev->port;
 474
 475     assert(port != NULL);
 476     trace_usb_port_release(bus->busnr, port->path);
 477
 478     QTAILQ_REMOVE(&bus->used, port, next);
 479     bus->nused--;
 480
 481     dev->port = NULL;
 482     port->dev = NULL;
 483
 484     QTAILQ_INSERT_TAIL(&bus->free, port, next);
 485     bus->nfree++;
 486 }
 487
 488 static void usb_mask_to_str(char *dest, size_t size,
 489                             unsigned int speedmask)
 490 {
 491     static const struct {
 492         unsigned int mask;
 493         const char *name;
 494     } speeds[] = {
 495         { .mask = USB_SPEED_MASK_FULL,  .name = "full"  },
 496         { .mask = USB_SPEED_MASK_HIGH,  .name = "high"  },
 497         { .mask = USB_SPEED_MASK_SUPER, .name = "super" },
 498     };
 499     int i, pos = 0;
 500
 501     for (i = 0; i < ARRAY_SIZE(speeds); i++) {
 502         if (speeds[i].mask & speedmask) {
 503             pos += snprintf(dest + pos, size - pos, "%s%s",
 504                             pos ? "+" : "",
 505                             speeds[i].name);
 506         }
 507     }
 508 }
 509
 510 void usb_check_attach(USBDevice *dev, Error **errp)
 511 {
 512     USBBus *bus = usb_bus_from_device(dev);
 513     USBPort *port = dev->port;
 514     char devspeed[32], portspeed[32];
 515
 516     assert(port != NULL);
 517     assert(!dev->attached);
 518     usb_mask_to_str(devspeed, sizeof(devspeed), dev->speedmask);
 519     usb_mask_to_str(portspeed, sizeof(portspeed), port->speedmask);
 520     trace_usb_port_attach(bus->busnr, port->path,
 521                           devspeed, portspeed);
 522
 523     if (!(port->speedmask & dev->speedmask)) {
 524         error_setg(errp, "Warning: speed mismatch trying to attach"
 525                    " usb device \"%s\" (%s speed)"
 526                    " to bus \"%s\", port \"%s\" (%s speed)",
 527                    dev->product_desc, devspeed,
 528                    bus->qbus.name, port->path, portspeed);
 529         return;
 530     }
 531 }
 532
 533 void usb_device_attach(USBDevice *dev, Error **errp)
 534 {
 535     USBPort *port = dev->port;
 536     Error *local_err = NULL;
 537
 538     usb_check_attach(dev, &local_err);
 539     if (local_err) {
 540         error_propagate(errp, local_err);
 541         return;
 542     }
 543
 544     dev->attached = true;
 545     usb_attach(port);
 546 }
 547
 548 int usb_device_detach(USBDevice *dev)
 549 {
 550     USBBus *bus = usb_bus_from_device(dev);
 551     USBPort *port = dev->port;
 552
 553     assert(port != NULL);
 554     assert(dev->attached);
 555     trace_usb_port_detach(bus->busnr, port->path);
 556
 557     usb_detach(port);
 558     dev->attached = false;
 559     return 0;
 560 }
 561
 562 int usb_device_delete_addr(int busnr, int addr)
 563 {
 564     USBBus *bus;
 565     USBPort *port;
 566     USBDevice *dev;
 567
 568     bus = usb_bus_find(busnr);
 569     if (!bus)
 570         return -1;
 571
 572     QTAILQ_FOREACH(port, &bus->used, next) {
 573         if (port->dev->addr == addr)
 574             break;
 575     }
 576     if (!port)
 577         return -1;
 578     dev = port->dev;
 579
 580     object_unparent(OBJECT(dev));
 581     return 0;
 582 }
 583
 584 static const char *usb_speed(unsigned int speed)
 585 {
 586     static const char *txt[] = {
 587         [ USB_SPEED_LOW  ] = "1.5",
 588         [ USB_SPEED_FULL ] = "12",
 589         [ USB_SPEED_HIGH ] = "480",
 590         [ USB_SPEED_SUPER ] = "5000",
 591     };
 592     if (speed >= ARRAY_SIZE(txt))
 593         return "?";
 594     return txt[speed];
 595 }
 596
 597 static void usb_bus_dev_print(Monitor *mon, DeviceState *qdev, int indent)
 598 {
 599     USBDevice *dev = USB_DEVICE(qdev);
 600     USBBus *bus = usb_bus_from_device(dev);
 601
 602     monitor_printf(mon, "%*saddr %d.%d, port %s, speed %s, name %s%s\n",
 603                    indent, "", bus->busnr, dev->addr,
 604                    dev->port ? dev->port->path : "-",
 605                    usb_speed(dev->speed), dev->product_desc,
 606                    dev->attached ? ", attached" : "");
 607 }
 608
 609 static char *usb_get_dev_path(DeviceState *qdev)
 610 {
 611     USBDevice *dev = USB_DEVICE(qdev);
 612     DeviceState *hcd = qdev->parent_bus->parent;
 613     char *id = NULL;
 614
 615     if (dev->flags & (1 << USB_DEV_FLAG_FULL_PATH)) {
 616         id = qdev_get_dev_path(hcd);
 617     }
 618     if (id) {
 619         char *ret = g_strdup_printf("%s/%s", id, dev->port->path);
 620         g_free(id);
 621         return ret;
 622     } else {
 623         return g_strdup(dev->port->path);
 624     }
 625 }
 626
 627 static char *usb_get_fw_dev_path(DeviceState *qdev)
 628 {
 629     USBDevice *dev = USB_DEVICE(qdev);
 630     char *fw_path, *in;
 631     ssize_t pos = 0, fw_len;
 632     long nr;
 633
 634     fw_len = 32 + strlen(dev->port->path) * 6;
 635     fw_path = g_malloc(fw_len);
 636     in = dev->port->path;
 637     while (fw_len - pos > 0) {
 638         nr = strtol(in, &in, 10);
 639         if (in[0] == '.') {
 640             /* some hub between root port and device */
 641             pos += snprintf(fw_path + pos, fw_len - pos, "hub@%lx/", nr);
 642             in++;
 643         } else {
 644             /* the device itself */
 645             pos += snprintf(fw_path + pos, fw_len - pos, "%s@%lx",
 646                             qdev_fw_name(qdev), nr);
 647             break;
 648         }
 649     }
 650     return fw_path;
 651 }
 652
 653 void hmp_info_usb(Monitor *mon, const QDict *qdict)
 654 {
 655     USBBus *bus;
 656     USBDevice *dev;
 657     USBPort *port;
 658
 659     if (QTAILQ_EMPTY(&busses)) {
 660         monitor_printf(mon, "USB support not enabled\n");
 661         return;
 662     }
 663
 664     QTAILQ_FOREACH(bus, &busses, next) {
 665         QTAILQ_FOREACH(port, &bus->used, next) {
 666             dev = port->dev;
 667             if (!dev)
 668                 continue;
 669             monitor_printf(mon, "  Device %d.%d, Port %s, Speed %s Mb/s, "
 670                            "Product %s%s%s\n",
 671                            bus->busnr, dev->addr, port->path,
 672                            usb_speed(dev->speed), dev->product_desc,
 673                            dev->qdev.id ? ", ID: " : "",
 674                            dev->qdev.id ?: "");
 675         }
 676     }
 677 }
 678
 679 /* handle legacy -usbdevice cmd line option */
 680 USBDevice *usbdevice_create(const char *cmdline)
 681 {
 682     USBBus *bus = usb_bus_find(-1 /* any */);
 683     LegacyUSBFactory *f = NULL;
 684     Error *err = NULL;
 685     GSList *i;
 686     char driver[32];
 687     const char *params;
 688     int len;
 689     USBDevice *dev;
 690     ObjectClass *klass;
 691     DeviceClass *dc;
 692
 693     params = strchr(cmdline,':');
 694     if (params) {
 695         params++;
 696         len = params - cmdline;
 697         if (len > sizeof(driver))
 698             len = sizeof(driver);
 699         pstrcpy(driver, len, cmdline);
 700     } else {
 701         params = "";
 702         pstrcpy(driver, sizeof(driver), cmdline);
 703     }
 704
 705     for (i = legacy_usb_factory; i; i = i->next) {
 706         f = i->data;
 707         if (strcmp(f->usbdevice_name, driver) == 0) {
 708             break;
 709         }
 710     }
 711     if (i == NULL) {
 712 #if 0
 713         /* no error because some drivers are not converted (yet) */
 714         error_report("usbdevice %s not found", driver);
 715 #endif
 716         return NULL;
 717     }
 718
 719     if (!bus) {
 720         error_report("Error: no usb bus to attach usbdevice %s, "
 721                      "please try -machine usb=on and check that "
 722                      "the machine model supports USB", driver);
 723         return NULL;
 724     }
 725
 726     klass = object_class_by_name(f->name);
 727     if (klass == NULL) {
 728         error_report("Device '%s' not found", f->name);
 729         return NULL;
 730     }
 731
 732     dc = DEVICE_CLASS(klass);
 733
 734     if (only_migratable) {
 735         if (dc->vmsd->unmigratable) {
 736             error_report("Device %s is not migratable, but --only-migratable "
 737                          "was specified", f->name);
 738             return NULL;
 739         }
 740     }
 741
 742     if (f->usbdevice_init) {
 743         dev = f->usbdevice_init(bus, params);
 744     } else {
 745         if (*params) {
 746             error_report("usbdevice %s accepts no params", driver);
 747             return NULL;
 748         }
 749         dev = usb_create(bus, f->name);
 750     }
 751     if (!dev) {
 752         error_report("Failed to create USB device '%s'", f->name);
 753         return NULL;
 754     }
 755     object_property_set_bool(OBJECT(dev), true, "realized", &err);
 756     if (err) {
 757         error_reportf_err(err, "Failed to initialize USB device '%s': ",
 758                           f->name);
 759         object_unparent(OBJECT(dev));
 760         return NULL;
 761     }
 762     return dev;
 763 }
 764
 765 static bool usb_get_attached(Object *obj, Error **errp)
 766 {
 767     USBDevice *dev = USB_DEVICE(obj);
 768
 769     return dev->attached;
 770 }
 771
 772 static void usb_set_attached(Object *obj, bool value, Error **errp)
 773 {
 774     USBDevice *dev = USB_DEVICE(obj);
 775     Error *err = NULL;
 776
 777     if (dev->attached == value) {
 778         return;
 779     }
 780
 781     if (value) {
 782         usb_device_attach(dev, &err);
 783         if (err) {
 784             error_propagate(errp, err);
 785         }
 786     } else {
 787         usb_device_detach(dev);
 788     }
 789 }
 790
 791 static void usb_device_instance_init(Object *obj)
 792 {
 793     USBDevice *dev = USB_DEVICE(obj);
 794     USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
 795
 796     if (klass->attached_settable) {
 797         object_property_add_bool(obj, "attached",
 798                                  usb_get_attached, usb_set_attached,
 799                                  NULL);
 800     } else {
 801         object_property_add_bool(obj, "attached",
 802                                  usb_get_attached, NULL,
 803                                  NULL);
 804     }
 805 }
 806
 807 static void usb_device_class_init(ObjectClass *klass, void *data)
 808 {
 809     DeviceClass *k = DEVICE_CLASS(klass);
 810     k->bus_type = TYPE_USB_BUS;
 811     k->realize  = usb_qdev_realize;
 812     k->unrealize = usb_qdev_unrealize;
 813     k->props    = usb_props;
 814 }
 815
 816 static const TypeInfo usb_device_type_info = {
 817     .name = TYPE_USB_DEVICE,
 818     .parent = TYPE_DEVICE,
 819     .instance_size = sizeof(USBDevice),
 820     .instance_init = usb_device_instance_init,
 821     .abstract = true,
 822     .class_size = sizeof(USBDeviceClass),
 823     .class_init = usb_device_class_init,
 824 };
 825
 826 static void usb_register_types(void)
 827 {
 828     type_register_static(&usb_bus_info);
 829     type_register_static(&usb_device_type_info);
 830 }
 831
 832 type_init(usb_register_types)