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 "qapi/qapi-commands-machine.h"
   6 #include "qapi/type-helpers.h"
   7 #include "qemu/error-report.h"
   8 #include "qemu/module.h"
   9 #include "sysemu/sysemu.h"
  10 #include "migration/vmstate.h"
  11 #include "monitor/monitor.h"
  12 #include "trace.h"
  13 #include "qemu/cutils.h"
  14
  15 static void usb_bus_dev_print(Monitor *mon, DeviceState *qdev, int indent);
  16
  17 static char *usb_get_dev_path(DeviceState *dev);
  18 static char *usb_get_fw_dev_path(DeviceState *qdev);
  19 static void usb_qdev_unrealize(DeviceState *qdev);
  20
  21 static Property usb_props[] = {
  22     DEFINE_PROP_STRING("port", USBDevice, port_path),
  23     DEFINE_PROP_STRING("serial", USBDevice, serial),
  24     DEFINE_PROP_BIT("msos-desc", USBDevice, flags,
  25                     USB_DEV_FLAG_MSOS_DESC_ENABLE, true),
  26     DEFINE_PROP_STRING("pcap", USBDevice, pcap_filename),
  27     DEFINE_PROP_END_OF_LIST()
  28 };
  29
  30 static void usb_bus_class_init(ObjectClass *klass, void *data)
  31 {
  32     BusClass *k = BUS_CLASS(klass);
  33     HotplugHandlerClass *hc = HOTPLUG_HANDLER_CLASS(klass);
  34
  35     k->print_dev = usb_bus_dev_print;
  36     k->get_dev_path = usb_get_dev_path;
  37     k->get_fw_dev_path = usb_get_fw_dev_path;
  38     hc->unplug = qdev_simple_device_unplug_cb;
  39 }
  40
  41 static const TypeInfo usb_bus_info = {
  42     .name = TYPE_USB_BUS,
  43     .parent = TYPE_BUS,
  44     .instance_size = sizeof(USBBus),
  45     .class_init = usb_bus_class_init,
  46     .interfaces = (InterfaceInfo[]) {
  47         { TYPE_HOTPLUG_HANDLER },
  48         { }
  49     }
  50 };
  51
  52 static int next_usb_bus = 0;
  53 static QTAILQ_HEAD(, USBBus) busses = QTAILQ_HEAD_INITIALIZER(busses);
  54
  55 static int usb_device_post_load(void *opaque, int version_id)
  56 {
  57     USBDevice *dev = opaque;
  58
  59     if (dev->state == USB_STATE_NOTATTACHED) {
  60         dev->attached = false;
  61     } else {
  62         dev->attached = true;
  63     }
  64     return 0;
  65 }
  66
  67 const VMStateDescription vmstate_usb_device = {
  68     .name = "USBDevice",
  69     .version_id = 1,
  70     .minimum_version_id = 1,
  71     .post_load = usb_device_post_load,
  72     .fields = (const VMStateField[]) {
  73         VMSTATE_UINT8(addr, USBDevice),
  74         VMSTATE_INT32(state, USBDevice),
  75         VMSTATE_INT32(remote_wakeup, USBDevice),
  76         VMSTATE_INT32(setup_state, USBDevice),
  77         VMSTATE_INT32(setup_len, USBDevice),
  78         VMSTATE_INT32(setup_index, USBDevice),
  79         VMSTATE_UINT8_ARRAY(setup_buf, USBDevice, 8),
  80         VMSTATE_END_OF_LIST(),
  81     }
  82 };
  83
  84 void usb_bus_new(USBBus *bus, size_t bus_size,
  85                  USBBusOps *ops, DeviceState *host)
  86 {
  87     qbus_init(bus, bus_size, TYPE_USB_BUS, host, NULL);
  88     qbus_set_bus_hotplug_handler(BUS(bus));
  89     bus->ops = ops;
  90     bus->busnr = next_usb_bus++;
  91     QTAILQ_INIT(&bus->free);
  92     QTAILQ_INIT(&bus->used);
  93     QTAILQ_INSERT_TAIL(&busses, bus, next);
  94 }
  95
  96 void usb_bus_release(USBBus *bus)
  97 {
  98     assert(next_usb_bus > 0);
  99
 100     QTAILQ_REMOVE(&busses, bus, next);
 101 }
 102
 103 static void usb_device_realize(USBDevice *dev, Error **errp)
 104 {
 105     USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
 106
 107     if (klass->realize) {
 108         klass->realize(dev, errp);
 109     }
 110 }
 111
 112 USBDevice *usb_device_find_device(USBDevice *dev, uint8_t addr)
 113 {
 114     USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
 115     if (klass->find_device) {
 116         return klass->find_device(dev, addr);
 117     }
 118     return NULL;
 119 }
 120
 121 static void usb_device_unrealize(USBDevice *dev)
 122 {
 123     USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
 124
 125     if (klass->unrealize) {
 126         klass->unrealize(dev);
 127     }
 128 }
 129
 130 void usb_device_cancel_packet(USBDevice *dev, USBPacket *p)
 131 {
 132     USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
 133     if (klass->cancel_packet) {
 134         klass->cancel_packet(dev, p);
 135     }
 136 }
 137
 138 void usb_device_handle_attach(USBDevice *dev)
 139 {
 140     USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
 141     if (klass->handle_attach) {
 142         klass->handle_attach(dev);
 143     }
 144 }
 145
 146 void usb_device_handle_reset(USBDevice *dev)
 147 {
 148     USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
 149     if (klass->handle_reset) {
 150         klass->handle_reset(dev);
 151     }
 152 }
 153
 154 void usb_device_handle_control(USBDevice *dev, USBPacket *p, int request,
 155                                int value, int index, int length, uint8_t *data)
 156 {
 157     USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
 158     if (klass->handle_control) {
 159         klass->handle_control(dev, p, request, value, index, length, data);
 160     }
 161 }
 162
 163 void usb_device_handle_data(USBDevice *dev, USBPacket *p)
 164 {
 165     USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
 166     if (klass->handle_data) {
 167         klass->handle_data(dev, p);
 168     }
 169 }
 170
 171 const char *usb_device_get_product_desc(USBDevice *dev)
 172 {
 173     USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
 174     return klass->product_desc;
 175 }
 176
 177 const USBDesc *usb_device_get_usb_desc(USBDevice *dev)
 178 {
 179     USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
 180     if (dev->usb_desc) {
 181         return dev->usb_desc;
 182     }
 183     return klass->usb_desc;
 184 }
 185
 186 void usb_device_set_interface(USBDevice *dev, int interface,
 187                               int alt_old, int alt_new)
 188 {
 189     USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
 190     if (klass->set_interface) {
 191         klass->set_interface(dev, interface, alt_old, alt_new);
 192     }
 193 }
 194
 195 void usb_device_flush_ep_queue(USBDevice *dev, USBEndpoint *ep)
 196 {
 197     USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
 198     if (klass->flush_ep_queue) {
 199         klass->flush_ep_queue(dev, ep);
 200     }
 201 }
 202
 203 void usb_device_ep_stopped(USBDevice *dev, USBEndpoint *ep)
 204 {
 205     USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
 206     if (klass->ep_stopped) {
 207         klass->ep_stopped(dev, ep);
 208     }
 209 }
 210
 211 int usb_device_alloc_streams(USBDevice *dev, USBEndpoint **eps, int nr_eps,
 212                              int streams)
 213 {
 214     USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
 215     if (klass->alloc_streams) {
 216         return klass->alloc_streams(dev, eps, nr_eps, streams);
 217     }
 218     return 0;
 219 }
 220
 221 void usb_device_free_streams(USBDevice *dev, USBEndpoint **eps, int nr_eps)
 222 {
 223     USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
 224     if (klass->free_streams) {
 225         klass->free_streams(dev, eps, nr_eps);
 226     }
 227 }
 228
 229 static void usb_qdev_realize(DeviceState *qdev, Error **errp)
 230 {
 231     USBDevice *dev = USB_DEVICE(qdev);
 232     Error *local_err = NULL;
 233
 234     pstrcpy(dev->product_desc, sizeof(dev->product_desc),
 235             usb_device_get_product_desc(dev));
 236     dev->auto_attach = 1;
 237     QLIST_INIT(&dev->strings);
 238     usb_ep_init(dev);
 239
 240     usb_claim_port(dev, &local_err);
 241     if (local_err) {
 242         error_propagate(errp, local_err);
 243         return;
 244     }
 245
 246     usb_device_realize(dev, &local_err);
 247     if (local_err) {
 248         usb_release_port(dev);
 249         error_propagate(errp, local_err);
 250         return;
 251     }
 252
 253     if (dev->auto_attach) {
 254         usb_device_attach(dev, &local_err);
 255         if (local_err) {
 256             usb_qdev_unrealize(qdev);
 257             error_propagate(errp, local_err);
 258             return;
 259         }
 260     }
 261
 262     if (dev->pcap_filename) {
 263         int fd = qemu_open_old(dev->pcap_filename,
 264                                O_CREAT | O_WRONLY | O_TRUNC | O_BINARY, 0666);
 265         if (fd < 0) {
 266             error_setg(errp, "open %s failed", dev->pcap_filename);
 267             usb_qdev_unrealize(qdev);
 268             return;
 269         }
 270         dev->pcap = fdopen(fd, "wb");
 271         usb_pcap_init(dev->pcap);
 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->pcap) {
 287         fclose(dev->pcap);
 288     }
 289
 290     if (dev->attached) {
 291         usb_device_detach(dev);
 292     }
 293     usb_device_unrealize(dev);
 294     if (dev->port) {
 295         usb_release_port(dev);
 296     }
 297 }
 298
 299 typedef struct LegacyUSBFactory
 300 {
 301     const char *name;
 302     const char *usbdevice_name;
 303     USBDevice *(*usbdevice_init)(void);
 304 } LegacyUSBFactory;
 305
 306 static GSList *legacy_usb_factory;
 307
 308 void usb_legacy_register(const char *typename, const char *usbdevice_name,
 309                          USBDevice *(*usbdevice_init)(void))
 310 {
 311     if (usbdevice_name) {
 312         LegacyUSBFactory *f = g_malloc0(sizeof(*f));
 313         f->name = typename;
 314         f->usbdevice_name = usbdevice_name;
 315         f->usbdevice_init = usbdevice_init;
 316         legacy_usb_factory = g_slist_append(legacy_usb_factory, f);
 317     }
 318 }
 319
 320 static void usb_fill_port(USBPort *port, void *opaque, int index,
 321                           USBPortOps *ops, int speedmask)
 322 {
 323     port->opaque = opaque;
 324     port->index = index;
 325     port->ops = ops;
 326     port->speedmask = speedmask;
 327     usb_port_location(port, NULL, index + 1);
 328 }
 329
 330 void usb_register_port(USBBus *bus, USBPort *port, void *opaque, int index,
 331                        USBPortOps *ops, int speedmask)
 332 {
 333     usb_fill_port(port, opaque, index, ops, speedmask);
 334     QTAILQ_INSERT_TAIL(&bus->free, port, next);
 335     bus->nfree++;
 336 }
 337
 338 void usb_register_companion(const char *masterbus, USBPort *ports[],
 339                             uint32_t portcount, uint32_t firstport,
 340                             void *opaque, USBPortOps *ops, int speedmask,
 341                             Error **errp)
 342 {
 343     USBBus *bus;
 344     int i;
 345
 346     QTAILQ_FOREACH(bus, &busses, next) {
 347         if (strcmp(bus->qbus.name, masterbus) == 0) {
 348             break;
 349         }
 350     }
 351
 352     if (!bus) {
 353         error_setg(errp, "USB bus '%s' not found", masterbus);
 354         return;
 355     }
 356     if (!bus->ops->register_companion) {
 357         error_setg(errp, "Can't use USB bus '%s' as masterbus,"
 358                    " it doesn't support companion controllers",
 359                    masterbus);
 360         return;
 361     }
 362
 363     for (i = 0; i < portcount; i++) {
 364         usb_fill_port(ports[i], opaque, i, ops, speedmask);
 365     }
 366
 367     bus->ops->register_companion(bus, ports, portcount, firstport, errp);
 368 }
 369
 370 void usb_port_location(USBPort *downstream, USBPort *upstream, int portnr)
 371 {
 372     if (upstream) {
 373         int l = snprintf(downstream->path, sizeof(downstream->path), "%s.%d",
 374                          upstream->path, portnr);
 375         /* Max string is nn.nn.nn.nn.nn, which fits in 16 bytes */
 376         assert(l < sizeof(downstream->path));
 377         downstream->hubcount = upstream->hubcount + 1;
 378     } else {
 379         snprintf(downstream->path, sizeof(downstream->path), "%d", portnr);
 380         downstream->hubcount = 0;
 381     }
 382 }
 383
 384 void usb_unregister_port(USBBus *bus, USBPort *port)
 385 {
 386     if (port->dev) {
 387         object_unparent(OBJECT(port->dev));
 388     }
 389     QTAILQ_REMOVE(&bus->free, port, next);
 390     bus->nfree--;
 391 }
 392
 393 void usb_claim_port(USBDevice *dev, Error **errp)
 394 {
 395     USBBus *bus = usb_bus_from_device(dev);
 396     USBPort *port;
 397     USBDevice *hub;
 398
 399     assert(dev->port == NULL);
 400
 401     if (dev->port_path) {
 402         QTAILQ_FOREACH(port, &bus->free, next) {
 403             if (strcmp(port->path, dev->port_path) == 0) {
 404                 break;
 405             }
 406         }
 407         if (port == NULL) {
 408             error_setg(errp, "usb port %s (bus %s) not found (in use?)",
 409                        dev->port_path, bus->qbus.name);
 410             return;
 411         }
 412     } else {
 413         if (bus->nfree == 1 && strcmp(object_get_typename(OBJECT(dev)), "usb-hub") != 0) {
 414             /* Create a new hub and chain it on */
 415             hub = usb_try_new("usb-hub");
 416             if (hub) {
 417                 usb_realize_and_unref(hub, bus, NULL);
 418             }
 419         }
 420         if (bus->nfree == 0) {
 421             error_setg(errp, "tried to attach usb device %s to a bus "
 422                        "with no free ports", dev->product_desc);
 423             return;
 424         }
 425         port = QTAILQ_FIRST(&bus->free);
 426     }
 427     trace_usb_port_claim(bus->busnr, port->path);
 428
 429     QTAILQ_REMOVE(&bus->free, port, next);
 430     bus->nfree--;
 431
 432     dev->port = port;
 433     port->dev = dev;
 434
 435     QTAILQ_INSERT_TAIL(&bus->used, port, next);
 436     bus->nused++;
 437 }
 438
 439 void usb_release_port(USBDevice *dev)
 440 {
 441     USBBus *bus = usb_bus_from_device(dev);
 442     USBPort *port = dev->port;
 443
 444     assert(port != NULL);
 445     trace_usb_port_release(bus->busnr, port->path);
 446
 447     QTAILQ_REMOVE(&bus->used, port, next);
 448     bus->nused--;
 449
 450     dev->port = NULL;
 451     port->dev = NULL;
 452
 453     QTAILQ_INSERT_TAIL(&bus->free, port, next);
 454     bus->nfree++;
 455 }
 456
 457 static void usb_mask_to_str(char *dest, size_t size,
 458                             unsigned int speedmask)
 459 {
 460     static const struct {
 461         unsigned int mask;
 462         const char *name;
 463     } speeds[] = {
 464         { .mask = USB_SPEED_MASK_FULL,  .name = "full"  },
 465         { .mask = USB_SPEED_MASK_HIGH,  .name = "high"  },
 466         { .mask = USB_SPEED_MASK_SUPER, .name = "super" },
 467     };
 468     int i, pos = 0;
 469
 470     for (i = 0; i < ARRAY_SIZE(speeds); i++) {
 471         if (speeds[i].mask & speedmask) {
 472             pos += snprintf(dest + pos, size - pos, "%s%s",
 473                             pos ? "+" : "",
 474                             speeds[i].name);
 475         }
 476     }
 477
 478     if (pos == 0) {
 479         snprintf(dest, size, "unknown");
 480     }
 481 }
 482
 483 void usb_check_attach(USBDevice *dev, Error **errp)
 484 {
 485     USBBus *bus = usb_bus_from_device(dev);
 486     USBPort *port = dev->port;
 487     char devspeed[32], portspeed[32];
 488
 489     assert(port != NULL);
 490     assert(!dev->attached);
 491     usb_mask_to_str(devspeed, sizeof(devspeed), dev->speedmask);
 492     usb_mask_to_str(portspeed, sizeof(portspeed), port->speedmask);
 493     trace_usb_port_attach(bus->busnr, port->path,
 494                           devspeed, portspeed);
 495
 496     if (!(port->speedmask & dev->speedmask)) {
 497         error_setg(errp, "Warning: speed mismatch trying to attach"
 498                    " usb device \"%s\" (%s speed)"
 499                    " to bus \"%s\", port \"%s\" (%s speed)",
 500                    dev->product_desc, devspeed,
 501                    bus->qbus.name, port->path, portspeed);
 502         return;
 503     }
 504 }
 505
 506 void usb_device_attach(USBDevice *dev, Error **errp)
 507 {
 508     USBPort *port = dev->port;
 509     Error *local_err = NULL;
 510
 511     usb_check_attach(dev, &local_err);
 512     if (local_err) {
 513         error_propagate(errp, local_err);
 514         return;
 515     }
 516
 517     dev->attached = true;
 518     usb_attach(port);
 519 }
 520
 521 int usb_device_detach(USBDevice *dev)
 522 {
 523     USBBus *bus = usb_bus_from_device(dev);
 524     USBPort *port = dev->port;
 525
 526     assert(port != NULL);
 527     assert(dev->attached);
 528     trace_usb_port_detach(bus->busnr, port->path);
 529
 530     usb_detach(port);
 531     dev->attached = false;
 532     return 0;
 533 }
 534
 535 static const char *usb_speed(unsigned int speed)
 536 {
 537     static const char *txt[] = {
 538         [ USB_SPEED_LOW  ] = "1.5",
 539         [ USB_SPEED_FULL ] = "12",
 540         [ USB_SPEED_HIGH ] = "480",
 541         [ USB_SPEED_SUPER ] = "5000",
 542     };
 543     if (speed >= ARRAY_SIZE(txt))
 544         return "?";
 545     return txt[speed];
 546 }
 547
 548 static void usb_bus_dev_print(Monitor *mon, DeviceState *qdev, int indent)
 549 {
 550     USBDevice *dev = USB_DEVICE(qdev);
 551     USBBus *bus = usb_bus_from_device(dev);
 552
 553     monitor_printf(mon, "%*saddr %d.%d, port %s, speed %s, name %s%s\n",
 554                    indent, "", bus->busnr, dev->addr,
 555                    dev->port ? dev->port->path : "-",
 556                    usb_speed(dev->speed), dev->product_desc,
 557                    dev->attached ? ", attached" : "");
 558 }
 559
 560 static char *usb_get_dev_path(DeviceState *qdev)
 561 {
 562     USBDevice *dev = USB_DEVICE(qdev);
 563     DeviceState *hcd = qdev->parent_bus->parent;
 564     char *id = qdev_get_dev_path(hcd);
 565
 566     if (id) {
 567         char *ret = g_strdup_printf("%s/%s", id, dev->port->path);
 568         g_free(id);
 569         return ret;
 570     } else {
 571         return g_strdup(dev->port->path);
 572     }
 573 }
 574
 575 static char *usb_get_fw_dev_path(DeviceState *qdev)
 576 {
 577     USBDevice *dev = USB_DEVICE(qdev);
 578     char *fw_path, *in;
 579     ssize_t pos = 0, fw_len;
 580     long nr;
 581
 582     fw_len = 32 + strlen(dev->port->path) * 6;
 583     fw_path = g_malloc(fw_len);
 584     in = dev->port->path;
 585     while (fw_len - pos > 0) {
 586         nr = strtol(in, &in, 10);
 587         if (in[0] == '.') {
 588             /* some hub between root port and device */
 589             pos += snprintf(fw_path + pos, fw_len - pos, "hub@%lx/", nr);
 590             in++;
 591         } else {
 592             /* the device itself */
 593             snprintf(fw_path + pos, fw_len - pos, "%s@%lx",
 594                      qdev_fw_name(qdev), nr);
 595             break;
 596         }
 597     }
 598     return fw_path;
 599 }
 600
 601 HumanReadableText *qmp_x_query_usb(Error **errp)
 602 {
 603     g_autoptr(GString) buf = g_string_new("");
 604     USBBus *bus;
 605     USBDevice *dev;
 606     USBPort *port;
 607
 608     if (QTAILQ_EMPTY(&busses)) {
 609         error_setg(errp, "USB support not enabled");
 610         return NULL;
 611     }
 612
 613     QTAILQ_FOREACH(bus, &busses, next) {
 614         QTAILQ_FOREACH(port, &bus->used, next) {
 615             dev = port->dev;
 616             if (!dev)
 617                 continue;
 618             g_string_append_printf(buf,
 619                                    "  Device %d.%d, Port %s, Speed %s Mb/s, "
 620                                    "Product %s%s%s\n",
 621                                    bus->busnr, dev->addr, port->path,
 622                                    usb_speed(dev->speed), dev->product_desc,
 623                                    dev->qdev.id ? ", ID: " : "",
 624                                    dev->qdev.id ?: "");
 625         }
 626     }
 627
 628     return human_readable_text_from_str(buf);
 629 }
 630
 631 /* handle legacy -usbdevice cmd line option */
 632 USBDevice *usbdevice_create(const char *driver)
 633 {
 634     USBBus *bus = QTAILQ_FIRST(&busses);
 635     LegacyUSBFactory *f = NULL;
 636     Error *err = NULL;
 637     GSList *i;
 638     USBDevice *dev;
 639
 640     if (strchr(driver, ':')) {
 641         error_report("usbdevice parameters are not supported anymore");
 642         return NULL;
 643     }
 644
 645     for (i = legacy_usb_factory; i; i = i->next) {
 646         f = i->data;
 647         if (strcmp(f->usbdevice_name, driver) == 0) {
 648             break;
 649         }
 650     }
 651     if (i == NULL) {
 652 #if 0
 653         /* no error because some drivers are not converted (yet) */
 654         error_report("usbdevice %s not found", driver);
 655 #endif
 656         return NULL;
 657     }
 658
 659     if (!bus) {
 660         error_report("Error: no usb bus to attach usbdevice %s, "
 661                      "please try -machine usb=on and check that "
 662                      "the machine model supports USB", driver);
 663         return NULL;
 664     }
 665
 666     dev = f->usbdevice_init ? f->usbdevice_init() : usb_new(f->name);
 667     if (!dev) {
 668         error_report("Failed to create USB device '%s'", f->name);
 669         return NULL;
 670     }
 671     if (!usb_realize_and_unref(dev, bus, &err)) {
 672         error_reportf_err(err, "Failed to initialize USB device '%s': ",
 673                           f->name);
 674         object_unparent(OBJECT(dev));
 675         return NULL;
 676     }
 677     return dev;
 678 }
 679
 680 static bool usb_get_attached(Object *obj, Error **errp)
 681 {
 682     USBDevice *dev = USB_DEVICE(obj);
 683
 684     return dev->attached;
 685 }
 686
 687 static void usb_set_attached(Object *obj, bool value, Error **errp)
 688 {
 689     USBDevice *dev = USB_DEVICE(obj);
 690
 691     if (dev->attached == value) {
 692         return;
 693     }
 694
 695     if (value) {
 696         usb_device_attach(dev, errp);
 697     } else {
 698         usb_device_detach(dev);
 699     }
 700 }
 701
 702 static void usb_device_instance_init(Object *obj)
 703 {
 704     USBDevice *dev = USB_DEVICE(obj);
 705     USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
 706
 707     if (klass->attached_settable) {
 708         object_property_add_bool(obj, "attached",
 709                                  usb_get_attached, usb_set_attached);
 710     } else {
 711         object_property_add_bool(obj, "attached",
 712                                  usb_get_attached, NULL);
 713     }
 714 }
 715
 716 static void usb_device_class_init(ObjectClass *klass, void *data)
 717 {
 718     DeviceClass *k = DEVICE_CLASS(klass);
 719     k->bus_type = TYPE_USB_BUS;
 720     k->realize  = usb_qdev_realize;
 721     k->unrealize = usb_qdev_unrealize;
 722     device_class_set_props(k, usb_props);
 723 }
 724
 725 static const TypeInfo usb_device_type_info = {
 726     .name = TYPE_USB_DEVICE,
 727     .parent = TYPE_DEVICE,
 728     .instance_size = sizeof(USBDevice),
 729     .instance_init = usb_device_instance_init,
 730     .abstract = true,
 731     .class_size = sizeof(USBDeviceClass),
 732     .class_init = usb_device_class_init,
 733 };
 734
 735 static void usb_register_types(void)
 736 {
 737     type_register_static(&usb_bus_info);
 738     type_register_static(&usb_device_type_info);
 739 }
 740
 741 type_init(usb_register_types)