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