drivers/usb/host/usb-uclass.c

   1 /*
   2  * (C) Copyright 2015 Google, Inc
   3  * Written by Simon Glass <sjg@chromium.org>
   4  *
   5  * usb_match_device() modified from Linux kernel v4.0.
   6  *
   7  * SPDX-License-Identifier:     GPL-2.0+
   8  */
   9
  10 #include <common.h>
  11 #include <dm.h>
  12 #include <errno.h>
  13 #include <usb.h>
  14 #include <dm/device-internal.h>
  15 #include <dm/lists.h>
  16 #include <dm/root.h>
  17 #include <dm/uclass-internal.h>
  18
  19 DECLARE_GLOBAL_DATA_PTR;
  20
  21 extern bool usb_started; /* flag for the started/stopped USB status */
  22 static bool asynch_allowed;
  23
  24 struct usb_uclass_priv {
  25         int companion_device_count;
  26 };
  27
  28 int usb_disable_asynch(int disable)
  29 {
  30         int old_value = asynch_allowed;
  31
  32         asynch_allowed = !disable;
  33         return old_value;
  34 }
  35
  36 int submit_int_msg(struct usb_device *udev, unsigned long pipe, void *buffer,
  37                    int length, int interval)
  38 {
  39         struct udevice *bus = udev->controller_dev;
  40         struct dm_usb_ops *ops = usb_get_ops(bus);
  41
  42         if (!ops->interrupt)
  43                 return -ENOSYS;
  44
  45         return ops->interrupt(bus, udev, pipe, buffer, length, interval);
  46 }
  47
  48 int submit_control_msg(struct usb_device *udev, unsigned long pipe,
  49                        void *buffer, int length, struct devrequest *setup)
  50 {
  51         struct udevice *bus = udev->controller_dev;
  52         struct dm_usb_ops *ops = usb_get_ops(bus);
  53         struct usb_uclass_priv *uc_priv = bus->uclass->priv;
  54         int err;
  55
  56         if (!ops->control)
  57                 return -ENOSYS;
  58
  59         err = ops->control(bus, udev, pipe, buffer, length, setup);
  60         if (setup->request == USB_REQ_SET_FEATURE &&
  61             setup->requesttype == USB_RT_PORT &&
  62             setup->value == cpu_to_le16(USB_PORT_FEAT_RESET) &&
  63             err == -ENXIO) {
  64                 /* Device handed over to companion after port reset */
  65                 uc_priv->companion_device_count++;
  66         }
  67
  68         return err;
  69 }
  70
  71 int submit_bulk_msg(struct usb_device *udev, unsigned long pipe, void *buffer,
  72                     int length)
  73 {
  74         struct udevice *bus = udev->controller_dev;
  75         struct dm_usb_ops *ops = usb_get_ops(bus);
  76
  77         if (!ops->bulk)
  78                 return -ENOSYS;
  79
  80         return ops->bulk(bus, udev, pipe, buffer, length);
  81 }
  82
  83 struct int_queue *create_int_queue(struct usb_device *udev,
  84                 unsigned long pipe, int queuesize, int elementsize,
  85                 void *buffer, int interval)
  86 {
  87         struct udevice *bus = udev->controller_dev;
  88         struct dm_usb_ops *ops = usb_get_ops(bus);
  89
  90         if (!ops->create_int_queue)
  91                 return NULL;
  92
  93         return ops->create_int_queue(bus, udev, pipe, queuesize, elementsize,
  94                                      buffer, interval);
  95 }
  96
  97 void *poll_int_queue(struct usb_device *udev, struct int_queue *queue)
  98 {
  99         struct udevice *bus = udev->controller_dev;
 100         struct dm_usb_ops *ops = usb_get_ops(bus);
 101
 102         if (!ops->poll_int_queue)
 103                 return NULL;
 104
 105         return ops->poll_int_queue(bus, udev, queue);
 106 }
 107
 108 int destroy_int_queue(struct usb_device *udev, struct int_queue *queue)
 109 {
 110         struct udevice *bus = udev->controller_dev;
 111         struct dm_usb_ops *ops = usb_get_ops(bus);
 112
 113         if (!ops->destroy_int_queue)
 114                 return -ENOSYS;
 115
 116         return ops->destroy_int_queue(bus, udev, queue);
 117 }
 118
 119 int usb_alloc_device(struct usb_device *udev)
 120 {
 121         struct udevice *bus = udev->controller_dev;
 122         struct dm_usb_ops *ops = usb_get_ops(bus);
 123
 124         /* This is only requird by some controllers - current XHCI */
 125         if (!ops->alloc_device)
 126                 return 0;
 127
 128         return ops->alloc_device(bus, udev);
 129 }
 130
 131 int usb_stop(void)
 132 {
 133         struct udevice *bus;
 134         struct uclass *uc;
 135         struct usb_uclass_priv *uc_priv;
 136         int err = 0, ret;
 137
 138         /* De-activate any devices that have been activated */
 139         ret = uclass_get(UCLASS_USB, &uc);
 140         if (ret)
 141                 return ret;
 142
 143         uc_priv = uc->priv;
 144
 145         uclass_foreach_dev(bus, uc) {
 146                 ret = device_remove(bus);
 147                 if (ret && !err)
 148                         err = ret;
 149         }
 150
 151 #ifdef CONFIG_SANDBOX
 152         struct udevice *dev;
 153
 154         /* Reset all enulation devices */
 155         ret = uclass_get(UCLASS_USB_EMUL, &uc);
 156         if (ret)
 157                 return ret;
 158
 159         uclass_foreach_dev(dev, uc)
 160                 usb_emul_reset(dev);
 161 #endif
 162         usb_stor_reset();
 163         usb_hub_reset();
 164         uc_priv->companion_device_count = 0;
 165         usb_started = 0;
 166
 167         return err;
 168 }
 169
 170 static void usb_scan_bus(struct udevice *bus, bool recurse)
 171 {
 172         struct usb_bus_priv *priv;
 173         struct udevice *dev;
 174         int ret;
 175
 176         priv = dev_get_uclass_priv(bus);
 177
 178         assert(recurse);        /* TODO: Support non-recusive */
 179
 180         printf("scanning bus %d for devices... ", bus->seq);
 181         debug("\n");
 182         ret = usb_scan_device(bus, 0, USB_SPEED_FULL, &dev);
 183         if (ret)
 184                 printf("failed, error %d\n", ret);
 185         else if (priv->next_addr == 0)
 186                 printf("No USB Device found\n");
 187         else
 188                 printf("%d USB Device(s) found\n", priv->next_addr);
 189 }
 190
 191 int usb_init(void)
 192 {
 193         int controllers_initialized = 0;
 194         struct usb_uclass_priv *uc_priv;
 195         struct usb_bus_priv *priv;
 196         struct udevice *bus;
 197         struct uclass *uc;
 198         int count = 0;
 199         int ret;
 200
 201         asynch_allowed = 1;
 202         usb_hub_reset();
 203
 204         ret = uclass_get(UCLASS_USB, &uc);
 205         if (ret)
 206                 return ret;
 207
 208         uc_priv = uc->priv;
 209
 210         uclass_foreach_dev(bus, uc) {
 211                 /* init low_level USB */
 212                 printf("USB%d:   ", count);
 213                 count++;
 214                 ret = device_probe(bus);
 215                 if (ret == -ENODEV) {   /* No such device. */
 216                         puts("Port not available.\n");
 217                         controllers_initialized++;
 218                         continue;
 219                 }
 220
 221                 if (ret) {              /* Other error. */
 222                         printf("probe failed, error %d\n", ret);
 223                         continue;
 224                 }
 225                 controllers_initialized++;
 226                 usb_started = true;
 227         }
 228
 229         /*
 230          * lowlevel init done, now scan the bus for devices i.e. search HUBs
 231          * and configure them, first scan primary controllers.
 232          */
 233         uclass_foreach_dev(bus, uc) {
 234                 if (!device_active(bus))
 235                         continue;
 236
 237                 priv = dev_get_uclass_priv(bus);
 238                 if (!priv->companion)
 239                         usb_scan_bus(bus, true);
 240         }
 241
 242         /*
 243          * Now that the primary controllers have been scanned and have handed
 244          * over any devices they do not understand to their companions, scan
 245          * the companions if necessary.
 246          */
 247         if (uc_priv->companion_device_count) {
 248                 uclass_foreach_dev(bus, uc) {
 249                         if (!device_active(bus))
 250                                 continue;
 251
 252                         priv = dev_get_uclass_priv(bus);
 253                         if (priv->companion)
 254                                 usb_scan_bus(bus, true);
 255                 }
 256         }
 257
 258         debug("scan end\n");
 259         /* if we were not able to find at least one working bus, bail out */
 260         if (!count)
 261                 printf("No controllers found\n");
 262         else if (controllers_initialized == 0)
 263                 printf("USB error: all controllers failed lowlevel init\n");
 264
 265         return usb_started ? 0 : -1;
 266 }
 267
 268 int usb_reset_root_port(void)
 269 {
 270         return -ENOSYS;
 271 }
 272
 273 static struct usb_device *find_child_devnum(struct udevice *parent, int devnum)
 274 {
 275         struct usb_device *udev;
 276         struct udevice *dev;
 277
 278         if (!device_active(parent))
 279                 return NULL;
 280         udev = dev_get_parentdata(parent);
 281         if (udev->devnum == devnum)
 282                 return udev;
 283
 284         for (device_find_first_child(parent, &dev);
 285              dev;
 286              device_find_next_child(&dev)) {
 287                 udev = find_child_devnum(dev, devnum);
 288                 if (udev)
 289                         return udev;
 290         }
 291
 292         return NULL;
 293 }
 294
 295 struct usb_device *usb_get_dev_index(struct udevice *bus, int index)
 296 {
 297         struct udevice *hub;
 298         int devnum = index + 1; /* Addresses are allocated from 1 on USB */
 299
 300         device_find_first_child(bus, &hub);
 301         if (device_get_uclass_id(hub) == UCLASS_USB_HUB)
 302                 return find_child_devnum(hub, devnum);
 303
 304         return NULL;
 305 }
 306
 307 int usb_post_bind(struct udevice *dev)
 308 {
 309         /* Scan the bus for devices */
 310         return dm_scan_fdt_node(dev, gd->fdt_blob, dev->of_offset, false);
 311 }
 312
 313 int usb_port_reset(struct usb_device *parent, int portnr)
 314 {
 315         unsigned short portstatus;
 316         int ret;
 317
 318         debug("%s: start\n", __func__);
 319
 320         if (parent) {
 321                 /* reset the port for the second time */
 322                 assert(portnr > 0);
 323                 debug("%s: reset %d\n", __func__, portnr - 1);
 324                 ret = legacy_hub_port_reset(parent, portnr - 1, &portstatus);
 325                 if (ret < 0) {
 326                         printf("\n     Couldn't reset port %i\n", portnr);
 327                         return ret;
 328                 }
 329         } else {
 330                 debug("%s: reset root\n", __func__);
 331                 usb_reset_root_port();
 332         }
 333
 334         return 0;
 335 }
 336
 337 int usb_legacy_port_reset(struct usb_device *parent, int portnr)
 338 {
 339         return usb_port_reset(parent, portnr);
 340 }
 341
 342 int usb_setup_ehci_gadget(struct ehci_ctrl **ctlrp)
 343 {
 344         struct usb_platdata *plat;
 345         struct udevice *dev;
 346         int ret;
 347
 348         /* Find the old device and remove it */
 349         ret = uclass_find_device_by_seq(UCLASS_USB, 0, true, &dev);
 350         if (ret)
 351                 return ret;
 352         ret = device_remove(dev);
 353         if (ret)
 354                 return ret;
 355
 356         plat = dev_get_platdata(dev);
 357         plat->init_type = USB_INIT_DEVICE;
 358         ret = device_probe(dev);
 359         if (ret)
 360                 return ret;
 361         *ctlrp = dev_get_priv(dev);
 362
 363         return 0;
 364 }
 365
 366 /* returns 0 if no match, 1 if match */
 367 int usb_match_device(const struct usb_device_descriptor *desc,
 368                      const struct usb_device_id *id)
 369 {
 370         if ((id->match_flags & USB_DEVICE_ID_MATCH_VENDOR) &&
 371             id->idVendor != le16_to_cpu(desc->idVendor))
 372                 return 0;
 373
 374         if ((id->match_flags & USB_DEVICE_ID_MATCH_PRODUCT) &&
 375             id->idProduct != le16_to_cpu(desc->idProduct))
 376                 return 0;
 377
 378         /* No need to test id->bcdDevice_lo != 0, since 0 is never
 379            greater than any unsigned number. */
 380         if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_LO) &&
 381             (id->bcdDevice_lo > le16_to_cpu(desc->bcdDevice)))
 382                 return 0;
 383
 384         if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_HI) &&
 385             (id->bcdDevice_hi < le16_to_cpu(desc->bcdDevice)))
 386                 return 0;
 387
 388         if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_CLASS) &&
 389             (id->bDeviceClass != desc->bDeviceClass))
 390                 return 0;
 391
 392         if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_SUBCLASS) &&
 393             (id->bDeviceSubClass != desc->bDeviceSubClass))
 394                 return 0;
 395
 396         if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_PROTOCOL) &&
 397             (id->bDeviceProtocol != desc->bDeviceProtocol))
 398                 return 0;
 399
 400         return 1;
 401 }
 402
 403 /* returns 0 if no match, 1 if match */
 404 int usb_match_one_id_intf(const struct usb_device_descriptor *desc,
 405                           const struct usb_interface_descriptor *int_desc,
 406                           const struct usb_device_id *id)
 407 {
 408         /* The interface class, subclass, protocol and number should never be
 409          * checked for a match if the device class is Vendor Specific,
 410          * unless the match record specifies the Vendor ID. */
 411         if (desc->bDeviceClass == USB_CLASS_VENDOR_SPEC &&
 412             !(id->match_flags & USB_DEVICE_ID_MATCH_VENDOR) &&
 413             (id->match_flags & (USB_DEVICE_ID_MATCH_INT_CLASS |
 414                                 USB_DEVICE_ID_MATCH_INT_SUBCLASS |
 415                                 USB_DEVICE_ID_MATCH_INT_PROTOCOL |
 416                                 USB_DEVICE_ID_MATCH_INT_NUMBER)))
 417                 return 0;
 418
 419         if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_CLASS) &&
 420             (id->bInterfaceClass != int_desc->bInterfaceClass))
 421                 return 0;
 422
 423         if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_SUBCLASS) &&
 424             (id->bInterfaceSubClass != int_desc->bInterfaceSubClass))
 425                 return 0;
 426
 427         if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_PROTOCOL) &&
 428             (id->bInterfaceProtocol != int_desc->bInterfaceProtocol))
 429                 return 0;
 430
 431         if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_NUMBER) &&
 432             (id->bInterfaceNumber != int_desc->bInterfaceNumber))
 433                 return 0;
 434
 435         return 1;
 436 }
 437
 438 /* returns 0 if no match, 1 if match */
 439 int usb_match_one_id(struct usb_device_descriptor *desc,
 440                      struct usb_interface_descriptor *int_desc,
 441                      const struct usb_device_id *id)
 442 {
 443         if (!usb_match_device(desc, id))
 444                 return 0;
 445
 446         return usb_match_one_id_intf(desc, int_desc, id);
 447 }
 448
 449 /**
 450  * usb_find_and_bind_driver() - Find and bind the right USB driver
 451  *
 452  * This only looks at certain fields in the descriptor.
 453  */
 454 static int usb_find_and_bind_driver(struct udevice *parent,
 455                                     struct usb_device_descriptor *desc,
 456                                     struct usb_interface_descriptor *iface,
 457                                     int bus_seq, int devnum,
 458                                     struct udevice **devp)
 459 {
 460         struct usb_driver_entry *start, *entry;
 461         int n_ents;
 462         int ret;
 463         char name[30], *str;
 464
 465         *devp = NULL;
 466         debug("%s: Searching for driver\n", __func__);
 467         start = ll_entry_start(struct usb_driver_entry, usb_driver_entry);
 468         n_ents = ll_entry_count(struct usb_driver_entry, usb_driver_entry);
 469         for (entry = start; entry != start + n_ents; entry++) {
 470                 const struct usb_device_id *id;
 471                 struct udevice *dev;
 472                 const struct driver *drv;
 473                 struct usb_dev_platdata *plat;
 474
 475                 for (id = entry->match; id->match_flags; id++) {
 476                         if (!usb_match_one_id(desc, iface, id))
 477                                 continue;
 478
 479                         drv = entry->driver;
 480                         /*
 481                          * We could pass the descriptor to the driver as
 482                          * platdata (instead of NULL) and allow its bind()
 483                          * method to return -ENOENT if it doesn't support this
 484                          * device. That way we could continue the search to
 485                          * find another driver. For now this doesn't seem
 486                          * necesssary, so just bind the first match.
 487                          */
 488                         ret = device_bind(parent, drv, drv->name, NULL, -1,
 489                                           &dev);
 490                         if (ret)
 491                                 goto error;
 492                         debug("%s: Match found: %s\n", __func__, drv->name);
 493                         dev->driver_data = id->driver_info;
 494                         plat = dev_get_parent_platdata(dev);
 495                         plat->id = *id;
 496                         *devp = dev;
 497                         return 0;
 498                 }
 499         }
 500
 501         /* Bind a generic driver so that the device can be used */
 502         snprintf(name, sizeof(name), "generic_bus_%x_dev_%x", bus_seq, devnum);
 503         str = strdup(name);
 504         if (!str)
 505                 return -ENOMEM;
 506         ret = device_bind_driver(parent, "usb_dev_generic_drv", str, devp);
 507
 508 error:
 509         debug("%s: No match found: %d\n", __func__, ret);
 510         return ret;
 511 }
 512
 513 /**
 514  * usb_find_child() - Find an existing device which matches our needs
 515  *
 516  *
 517  */
 518 static int usb_find_child(struct udevice *parent,
 519                           struct usb_device_descriptor *desc,
 520                           struct usb_interface_descriptor *iface,
 521                           struct udevice **devp)
 522 {
 523         struct udevice *dev;
 524
 525         *devp = NULL;
 526         for (device_find_first_child(parent, &dev);
 527              dev;
 528              device_find_next_child(&dev)) {
 529                 struct usb_dev_platdata *plat = dev_get_parent_platdata(dev);
 530
 531                 /* If this device is already in use, skip it */
 532                 if (device_active(dev))
 533                         continue;
 534                 debug("   %s: name='%s', plat=%d, desc=%d\n", __func__,
 535                       dev->name, plat->id.bDeviceClass, desc->bDeviceClass);
 536                 if (usb_match_one_id(desc, iface, &plat->id)) {
 537                         *devp = dev;
 538                         return 0;
 539                 }
 540         }
 541
 542         return -ENOENT;
 543 }
 544
 545 int usb_scan_device(struct udevice *parent, int port,
 546                     enum usb_device_speed speed, struct udevice **devp)
 547 {
 548         struct udevice *dev;
 549         bool created = false;
 550         struct usb_dev_platdata *plat;
 551         struct usb_bus_priv *priv;
 552         struct usb_device *parent_udev;
 553         int ret;
 554         ALLOC_CACHE_ALIGN_BUFFER(struct usb_device, udev, 1);
 555         struct usb_interface_descriptor *iface = &udev->config.if_desc[0].desc;
 556
 557         *devp = NULL;
 558         memset(udev, '\0', sizeof(*udev));
 559         udev->controller_dev = usb_get_bus(parent);
 560         priv = dev_get_uclass_priv(udev->controller_dev);
 561
 562         /*
 563          * Somewhat nasty, this. We create a local device and use the normal
 564          * USB stack to read its descriptor. Then we know what type of device
 565          * to create for real.
 566          *
 567          * udev->dev is set to the parent, since we don't have a real device
 568          * yet. The USB stack should not access udev.dev anyway, except perhaps
 569          * to find the controller, and the controller will either be @parent,
 570          * or some parent of @parent.
 571          *
 572          * Another option might be to create the device as a generic USB
 573          * device, then morph it into the correct one when we know what it
 574          * should be. This means that a generic USB device would morph into
 575          * a network controller, or a USB flash stick, for example. However,
 576          * we don't support such morphing and it isn't clear that it would
 577          * be easy to do.
 578          *
 579          * Yet another option is to split out the USB stack parts of udev
 580          * into something like a 'struct urb' (as Linux does) which can exist
 581          * independently of any device. This feels cleaner, but calls for quite
 582          * a big change to the USB stack.
 583          *
 584          * For now, the approach is to set up an empty udev, read its
 585          * descriptor and assign it an address, then bind a real device and
 586          * stash the resulting information into the device's parent
 587          * platform data. Then when we probe it, usb_child_pre_probe() is called
 588          * and it will pull the information out of the stash.
 589          */
 590         udev->dev = parent;
 591         udev->speed = speed;
 592         udev->devnum = priv->next_addr + 1;
 593         udev->portnr = port;
 594         debug("Calling usb_setup_device(), portnr=%d\n", udev->portnr);
 595         parent_udev = device_get_uclass_id(parent) == UCLASS_USB_HUB ?
 596                 dev_get_parentdata(parent) : NULL;
 597         ret = usb_setup_device(udev, priv->desc_before_addr, parent_udev, port);
 598         debug("read_descriptor for '%s': ret=%d\n", parent->name, ret);
 599         if (ret)
 600                 return ret;
 601         ret = usb_find_child(parent, &udev->descriptor, iface, &dev);
 602         debug("** usb_find_child returns %d\n", ret);
 603         if (ret) {
 604                 if (ret != -ENOENT)
 605                         return ret;
 606                 ret = usb_find_and_bind_driver(parent, &udev->descriptor, iface,
 607                                                udev->controller_dev->seq,
 608                                                udev->devnum, &dev);
 609                 if (ret)
 610                         return ret;
 611                 created = true;
 612         }
 613         plat = dev_get_parent_platdata(dev);
 614         debug("%s: Probing '%s', plat=%p\n", __func__, dev->name, plat);
 615         plat->devnum = udev->devnum;
 616         plat->udev = udev;
 617         priv->next_addr++;
 618         ret = device_probe(dev);
 619         if (ret) {
 620                 debug("%s: Device '%s' probe failed\n", __func__, dev->name);
 621                 priv->next_addr--;
 622                 if (created)
 623                         device_unbind(dev);
 624                 return ret;
 625         }
 626         *devp = dev;
 627
 628         return 0;
 629 }
 630
 631 /*
 632  * Detect if a USB device has been plugged or unplugged.
 633  */
 634 int usb_detect_change(void)
 635 {
 636         struct udevice *hub;
 637         struct uclass *uc;
 638         int change = 0;
 639         int ret;
 640
 641         ret = uclass_get(UCLASS_USB_HUB, &uc);
 642         if (ret)
 643                 return ret;
 644
 645         uclass_foreach_dev(hub, uc) {
 646                 struct usb_device *udev;
 647                 struct udevice *dev;
 648
 649                 if (!device_active(hub))
 650                         continue;
 651                 for (device_find_first_child(hub, &dev);
 652                      dev;
 653                      device_find_next_child(&dev)) {
 654                         struct usb_port_status status;
 655
 656                         if (!device_active(dev))
 657                                 continue;
 658
 659                         udev = dev_get_parentdata(dev);
 660                         if (usb_get_port_status(udev, udev->portnr, &status)
 661                                         < 0)
 662                                 /* USB request failed */
 663                                 continue;
 664
 665                         if (le16_to_cpu(status.wPortChange) &
 666                             USB_PORT_STAT_C_CONNECTION)
 667                                 change++;
 668                 }
 669         }
 670
 671         return change;
 672 }
 673
 674 int usb_child_post_bind(struct udevice *dev)
 675 {
 676         struct usb_dev_platdata *plat = dev_get_parent_platdata(dev);
 677         const void *blob = gd->fdt_blob;
 678         int val;
 679
 680         if (dev->of_offset == -1)
 681                 return 0;
 682
 683         /* We only support matching a few things */
 684         val = fdtdec_get_int(blob, dev->of_offset, "usb,device-class", -1);
 685         if (val != -1) {
 686                 plat->id.match_flags |= USB_DEVICE_ID_MATCH_DEV_CLASS;
 687                 plat->id.bDeviceClass = val;
 688         }
 689         val = fdtdec_get_int(blob, dev->of_offset, "usb,interface-class", -1);
 690         if (val != -1) {
 691                 plat->id.match_flags |= USB_DEVICE_ID_MATCH_INT_CLASS;
 692                 plat->id.bInterfaceClass = val;
 693         }
 694
 695         return 0;
 696 }
 697
 698 struct udevice *usb_get_bus(struct udevice *dev)
 699 {
 700         struct udevice *bus;
 701
 702         for (bus = dev; bus && device_get_uclass_id(bus) != UCLASS_USB; )
 703                 bus = bus->parent;
 704         if (!bus) {
 705                 /* By design this cannot happen */
 706                 assert(bus);
 707                 debug("USB HUB '%s' does not have a controller\n", dev->name);
 708         }
 709
 710         return bus;
 711 }
 712
 713 int usb_child_pre_probe(struct udevice *dev)
 714 {
 715         struct usb_device *udev = dev_get_parentdata(dev);
 716         struct usb_dev_platdata *plat = dev_get_parent_platdata(dev);
 717         int ret;
 718
 719         if (plat->udev) {
 720                 /*
 721                  * Copy over all the values set in the on stack struct
 722                  * usb_device in usb_scan_device() to our final struct
 723                  * usb_device for this dev.
 724                  */
 725                 *udev = *(plat->udev);
 726                 /* And clear plat->udev as it will not be valid for long */
 727                 plat->udev = NULL;
 728                 udev->dev = dev;
 729         } else {
 730                 /*
 731                  * This happens with devices which are explicitly bound
 732                  * instead of being discovered through usb_scan_device()
 733                  * such as sandbox emul devices.
 734                  */
 735                 udev->dev = dev;
 736                 udev->controller_dev = usb_get_bus(dev);
 737                 udev->devnum = plat->devnum;
 738
 739                 /*
 740                  * udev did not go through usb_scan_device(), so we need to
 741                  * select the config and read the config descriptors.
 742                  */
 743                 ret = usb_select_config(udev);
 744                 if (ret)
 745                         return ret;
 746         }
 747
 748         return 0;
 749 }
 750
 751 UCLASS_DRIVER(usb) = {
 752         .id             = UCLASS_USB,
 753         .name           = "usb",
 754         .flags          = DM_UC_FLAG_SEQ_ALIAS,
 755         .post_bind      = usb_post_bind,
 756         .priv_auto_alloc_size = sizeof(struct usb_uclass_priv),
 757         .per_child_auto_alloc_size = sizeof(struct usb_device),
 758         .per_device_auto_alloc_size = sizeof(struct usb_bus_priv),
 759         .child_post_bind = usb_child_post_bind,
 760         .child_pre_probe = usb_child_pre_probe,
 761         .per_child_platdata_auto_alloc_size = sizeof(struct usb_dev_platdata),
 762 };
 763
 764 UCLASS_DRIVER(usb_dev_generic) = {
 765         .id             = UCLASS_USB_DEV_GENERIC,
 766         .name           = "usb_dev_generic",
 767 };
 768
 769 U_BOOT_DRIVER(usb_dev_generic_drv) = {
 770         .id             = UCLASS_USB_DEV_GENERIC,
 771         .name           = "usb_dev_generic_drv",
 772 };