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_unrealize(USBDevice *dev, Error **errp)
 139 {
 140     USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
 141
 142     if (klass->unrealize) {
 143         klass->unrealize(dev, errp);
 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_unrealize(dev, errp);
 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_prepend(errp, err,
 344                                 "Failed to initialize USB device '%s': ",
 345                                 name);
 346         return NULL;
 347     }
 348     return dev;
 349 }
 350
 351 USBDevice *usb_create_simple(USBBus *bus, const char *name)
 352 {
 353     return usb_try_create_simple(bus, name, &error_abort);
 354 }
 355
 356 static void usb_fill_port(USBPort *port, void *opaque, int index,
 357                           USBPortOps *ops, int speedmask)
 358 {
 359     port->opaque = opaque;
 360     port->index = index;
 361     port->ops = ops;
 362     port->speedmask = speedmask;
 363     usb_port_location(port, NULL, index + 1);
 364 }
 365
 366 void usb_register_port(USBBus *bus, USBPort *port, void *opaque, int index,
 367                        USBPortOps *ops, int speedmask)
 368 {
 369     usb_fill_port(port, opaque, index, ops, speedmask);
 370     QTAILQ_INSERT_TAIL(&bus->free, port, next);
 371     bus->nfree++;
 372 }
 373
 374 void usb_register_companion(const char *masterbus, USBPort *ports[],
 375                             uint32_t portcount, uint32_t firstport,
 376                             void *opaque, USBPortOps *ops, int speedmask,
 377                             Error **errp)
 378 {
 379     USBBus *bus;
 380     int i;
 381
 382     QTAILQ_FOREACH(bus, &busses, next) {
 383         if (strcmp(bus->qbus.name, masterbus) == 0) {
 384             break;
 385         }
 386     }
 387
 388     if (!bus) {
 389         error_setg(errp, "USB bus '%s' not found", masterbus);
 390         return;
 391     }
 392     if (!bus->ops->register_companion) {
 393         error_setg(errp, "Can't use USB bus '%s' as masterbus,"
 394                    " it doesn't support companion controllers",
 395                    masterbus);
 396         return;
 397     }
 398
 399     for (i = 0; i < portcount; i++) {
 400         usb_fill_port(ports[i], opaque, i, ops, speedmask);
 401     }
 402
 403     bus->ops->register_companion(bus, ports, portcount, firstport, errp);
 404 }
 405
 406 void usb_port_location(USBPort *downstream, USBPort *upstream, int portnr)
 407 {
 408     if (upstream) {
 409         int l = snprintf(downstream->path, sizeof(downstream->path), "%s.%d",
 410                          upstream->path, portnr);
 411         /* Max string is nn.nn.nn.nn.nn, which fits in 16 bytes */
 412         assert(l < sizeof(downstream->path));
 413         downstream->hubcount = upstream->hubcount + 1;
 414     } else {
 415         snprintf(downstream->path, sizeof(downstream->path), "%d", portnr);
 416         downstream->hubcount = 0;
 417     }
 418 }
 419
 420 void usb_unregister_port(USBBus *bus, USBPort *port)
 421 {
 422     if (port->dev) {
 423         object_unparent(OBJECT(port->dev));
 424     }
 425     QTAILQ_REMOVE(&bus->free, port, next);
 426     bus->nfree--;
 427 }
 428
 429 void usb_claim_port(USBDevice *dev, Error **errp)
 430 {
 431     USBBus *bus = usb_bus_from_device(dev);
 432     USBPort *port;
 433
 434     assert(dev->port == NULL);
 435
 436     if (dev->port_path) {
 437         QTAILQ_FOREACH(port, &bus->free, next) {
 438             if (strcmp(port->path, dev->port_path) == 0) {
 439                 break;
 440             }
 441         }
 442         if (port == NULL) {
 443             error_setg(errp, "usb port %s (bus %s) not found (in use?)",
 444                        dev->port_path, bus->qbus.name);
 445             return;
 446         }
 447     } else {
 448         if (bus->nfree == 1 && strcmp(object_get_typename(OBJECT(dev)), "usb-hub") != 0) {
 449             /* Create a new hub and chain it on */
 450             usb_try_create_simple(bus, "usb-hub", NULL);
 451         }
 452         if (bus->nfree == 0) {
 453             error_setg(errp, "tried to attach usb device %s to a bus "
 454                        "with no free ports", dev->product_desc);
 455             return;
 456         }
 457         port = QTAILQ_FIRST(&bus->free);
 458     }
 459     trace_usb_port_claim(bus->busnr, port->path);
 460
 461     QTAILQ_REMOVE(&bus->free, port, next);
 462     bus->nfree--;
 463
 464     dev->port = port;
 465     port->dev = dev;
 466
 467     QTAILQ_INSERT_TAIL(&bus->used, port, next);
 468     bus->nused++;
 469 }
 470
 471 void usb_release_port(USBDevice *dev)
 472 {
 473     USBBus *bus = usb_bus_from_device(dev);
 474     USBPort *port = dev->port;
 475
 476     assert(port != NULL);
 477     trace_usb_port_release(bus->busnr, port->path);
 478
 479     QTAILQ_REMOVE(&bus->used, port, next);
 480     bus->nused--;
 481
 482     dev->port = NULL;
 483     port->dev = NULL;
 484
 485     QTAILQ_INSERT_TAIL(&bus->free, port, next);
 486     bus->nfree++;
 487 }
 488
 489 static void usb_mask_to_str(char *dest, size_t size,
 490                             unsigned int speedmask)
 491 {
 492     static const struct {
 493         unsigned int mask;
 494         const char *name;
 495     } speeds[] = {
 496         { .mask = USB_SPEED_MASK_FULL,  .name = "full"  },
 497         { .mask = USB_SPEED_MASK_HIGH,  .name = "high"  },
 498         { .mask = USB_SPEED_MASK_SUPER, .name = "super" },
 499     };
 500     int i, pos = 0;
 501
 502     for (i = 0; i < ARRAY_SIZE(speeds); i++) {
 503         if (speeds[i].mask & speedmask) {
 504             pos += snprintf(dest + pos, size - pos, "%s%s",
 505                             pos ? "+" : "",
 506                             speeds[i].name);
 507         }
 508     }
 509 }
 510
 511 void usb_check_attach(USBDevice *dev, Error **errp)
 512 {
 513     USBBus *bus = usb_bus_from_device(dev);
 514     USBPort *port = dev->port;
 515     char devspeed[32], portspeed[32];
 516
 517     assert(port != NULL);
 518     assert(!dev->attached);
 519     usb_mask_to_str(devspeed, sizeof(devspeed), dev->speedmask);
 520     usb_mask_to_str(portspeed, sizeof(portspeed), port->speedmask);
 521     trace_usb_port_attach(bus->busnr, port->path,
 522                           devspeed, portspeed);
 523
 524     if (!(port->speedmask & dev->speedmask)) {
 525         error_setg(errp, "Warning: speed mismatch trying to attach"
 526                    " usb device \"%s\" (%s speed)"
 527                    " to bus \"%s\", port \"%s\" (%s speed)",
 528                    dev->product_desc, devspeed,
 529                    bus->qbus.name, port->path, portspeed);
 530         return;
 531     }
 532 }
 533
 534 void usb_device_attach(USBDevice *dev, Error **errp)
 535 {
 536     USBPort *port = dev->port;
 537     Error *local_err = NULL;
 538
 539     usb_check_attach(dev, &local_err);
 540     if (local_err) {
 541         error_propagate(errp, local_err);
 542         return;
 543     }
 544
 545     dev->attached = true;
 546     usb_attach(port);
 547 }
 548
 549 int usb_device_detach(USBDevice *dev)
 550 {
 551     USBBus *bus = usb_bus_from_device(dev);
 552     USBPort *port = dev->port;
 553
 554     assert(port != NULL);
 555     assert(dev->attached);
 556     trace_usb_port_detach(bus->busnr, port->path);
 557
 558     usb_detach(port);
 559     dev->attached = false;
 560     return 0;
 561 }
 562
 563 static const char *usb_speed(unsigned int speed)
 564 {
 565     static const char *txt[] = {
 566         [ USB_SPEED_LOW  ] = "1.5",
 567         [ USB_SPEED_FULL ] = "12",
 568         [ USB_SPEED_HIGH ] = "480",
 569         [ USB_SPEED_SUPER ] = "5000",
 570     };
 571     if (speed >= ARRAY_SIZE(txt))
 572         return "?";
 573     return txt[speed];
 574 }
 575
 576 static void usb_bus_dev_print(Monitor *mon, DeviceState *qdev, int indent)
 577 {
 578     USBDevice *dev = USB_DEVICE(qdev);
 579     USBBus *bus = usb_bus_from_device(dev);
 580
 581     monitor_printf(mon, "%*saddr %d.%d, port %s, speed %s, name %s%s\n",
 582                    indent, "", bus->busnr, dev->addr,
 583                    dev->port ? dev->port->path : "-",
 584                    usb_speed(dev->speed), dev->product_desc,
 585                    dev->attached ? ", attached" : "");
 586 }
 587
 588 static char *usb_get_dev_path(DeviceState *qdev)
 589 {
 590     USBDevice *dev = USB_DEVICE(qdev);
 591     DeviceState *hcd = qdev->parent_bus->parent;
 592     char *id = NULL;
 593
 594     if (dev->flags & (1 << USB_DEV_FLAG_FULL_PATH)) {
 595         id = qdev_get_dev_path(hcd);
 596     }
 597     if (id) {
 598         char *ret = g_strdup_printf("%s/%s", id, dev->port->path);
 599         g_free(id);
 600         return ret;
 601     } else {
 602         return g_strdup(dev->port->path);
 603     }
 604 }
 605
 606 static char *usb_get_fw_dev_path(DeviceState *qdev)
 607 {
 608     USBDevice *dev = USB_DEVICE(qdev);
 609     char *fw_path, *in;
 610     ssize_t pos = 0, fw_len;
 611     long nr;
 612
 613     fw_len = 32 + strlen(dev->port->path) * 6;
 614     fw_path = g_malloc(fw_len);
 615     in = dev->port->path;
 616     while (fw_len - pos > 0) {
 617         nr = strtol(in, &in, 10);
 618         if (in[0] == '.') {
 619             /* some hub between root port and device */
 620             pos += snprintf(fw_path + pos, fw_len - pos, "hub@%lx/", nr);
 621             in++;
 622         } else {
 623             /* the device itself */
 624             pos += snprintf(fw_path + pos, fw_len - pos, "%s@%lx",
 625                             qdev_fw_name(qdev), nr);
 626             break;
 627         }
 628     }
 629     return fw_path;
 630 }
 631
 632 void hmp_info_usb(Monitor *mon, const QDict *qdict)
 633 {
 634     USBBus *bus;
 635     USBDevice *dev;
 636     USBPort *port;
 637
 638     if (QTAILQ_EMPTY(&busses)) {
 639         monitor_printf(mon, "USB support not enabled\n");
 640         return;
 641     }
 642
 643     QTAILQ_FOREACH(bus, &busses, next) {
 644         QTAILQ_FOREACH(port, &bus->used, next) {
 645             dev = port->dev;
 646             if (!dev)
 647                 continue;
 648             monitor_printf(mon, "  Device %d.%d, Port %s, Speed %s Mb/s, "
 649                            "Product %s%s%s\n",
 650                            bus->busnr, dev->addr, port->path,
 651                            usb_speed(dev->speed), dev->product_desc,
 652                            dev->qdev.id ? ", ID: " : "",
 653                            dev->qdev.id ?: "");
 654         }
 655     }
 656 }
 657
 658 /* handle legacy -usbdevice cmd line option */
 659 USBDevice *usbdevice_create(const char *cmdline)
 660 {
 661     USBBus *bus = usb_bus_find(-1 /* any */);
 662     LegacyUSBFactory *f = NULL;
 663     Error *err = NULL;
 664     GSList *i;
 665     char driver[32];
 666     const char *params;
 667     int len;
 668     USBDevice *dev;
 669
 670     params = strchr(cmdline,':');
 671     if (params) {
 672         params++;
 673         len = params - cmdline;
 674         if (len > sizeof(driver))
 675             len = sizeof(driver);
 676         pstrcpy(driver, len, cmdline);
 677     } else {
 678         params = "";
 679         pstrcpy(driver, sizeof(driver), cmdline);
 680     }
 681
 682     for (i = legacy_usb_factory; i; i = i->next) {
 683         f = i->data;
 684         if (strcmp(f->usbdevice_name, driver) == 0) {
 685             break;
 686         }
 687     }
 688     if (i == NULL) {
 689 #if 0
 690         /* no error because some drivers are not converted (yet) */
 691         error_report("usbdevice %s not found", driver);
 692 #endif
 693         return NULL;
 694     }
 695
 696     if (!bus) {
 697         error_report("Error: no usb bus to attach usbdevice %s, "
 698                      "please try -machine usb=on and check that "
 699                      "the machine model supports USB", driver);
 700         return NULL;
 701     }
 702
 703     if (f->usbdevice_init) {
 704         dev = f->usbdevice_init(bus, params);
 705     } else {
 706         if (*params) {
 707             error_report("usbdevice %s accepts no params", driver);
 708             return NULL;
 709         }
 710         dev = usb_create(bus, f->name);
 711     }
 712     if (!dev) {
 713         error_report("Failed to create USB device '%s'", f->name);
 714         return NULL;
 715     }
 716     object_property_set_bool(OBJECT(dev), true, "realized", &err);
 717     if (err) {
 718         error_reportf_err(err, "Failed to initialize USB device '%s': ",
 719                           f->name);
 720         object_unparent(OBJECT(dev));
 721         return NULL;
 722     }
 723     return dev;
 724 }
 725
 726 static bool usb_get_attached(Object *obj, Error **errp)
 727 {
 728     USBDevice *dev = USB_DEVICE(obj);
 729
 730     return dev->attached;
 731 }
 732
 733 static void usb_set_attached(Object *obj, bool value, Error **errp)
 734 {
 735     USBDevice *dev = USB_DEVICE(obj);
 736     Error *err = NULL;
 737
 738     if (dev->attached == value) {
 739         return;
 740     }
 741
 742     if (value) {
 743         usb_device_attach(dev, &err);
 744         error_propagate(errp, err);
 745     } else {
 746         usb_device_detach(dev);
 747     }
 748 }
 749
 750 static void usb_device_instance_init(Object *obj)
 751 {
 752     USBDevice *dev = USB_DEVICE(obj);
 753     USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
 754
 755     if (klass->attached_settable) {
 756         object_property_add_bool(obj, "attached",
 757                                  usb_get_attached, usb_set_attached,
 758                                  NULL);
 759     } else {
 760         object_property_add_bool(obj, "attached",
 761                                  usb_get_attached, NULL,
 762                                  NULL);
 763     }
 764 }
 765
 766 static void usb_device_class_init(ObjectClass *klass, void *data)
 767 {
 768     DeviceClass *k = DEVICE_CLASS(klass);
 769     k->bus_type = TYPE_USB_BUS;
 770     k->realize  = usb_qdev_realize;
 771     k->unrealize = usb_qdev_unrealize;
 772     k->props    = usb_props;
 773 }
 774
 775 static const TypeInfo usb_device_type_info = {
 776     .name = TYPE_USB_DEVICE,
 777     .parent = TYPE_DEVICE,
 778     .instance_size = sizeof(USBDevice),
 779     .instance_init = usb_device_instance_init,
 780     .abstract = true,
 781     .class_size = sizeof(USBDeviceClass),
 782     .class_init = usb_device_class_init,
 783 };
 784
 785 static void usb_register_types(void)
 786 {
 787     type_register_static(&usb_bus_info);
 788     type_register_static(&usb_device_type_info);
 789 }
 790
 791 type_init(usb_register_types)