hw/usb/bus.c

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