git.sur5r.net Git - u-boot/blob - 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 <memalign.h>
  14 #include <usb.h>
  15 #include <dm/device-internal.h>
  16 #include <dm/lists.h>
  17 #include <dm/root.h>
  18 #include <dm/uclass-internal.h>
  19
  20 DECLARE_GLOBAL_DATA_PTR;
  21
  22 extern bool usb_started; /* flag for the started/stopped USB status */
  23 static bool asynch_allowed;
  24
  25 struct usb_uclass_priv {
  26         int companion_device_count;
  27 };
  28
  29 int usb_disable_asynch(int disable)
  30 {
  31         int old_value = asynch_allowed;
  32
  33         asynch_allowed = !disable;
  34         return old_value;
  35 }
  36
  37 int submit_int_msg(struct usb_device *udev, unsigned long pipe, void *buffer,
  38                    int length, int interval)
  39 {
  40         struct udevice *bus = udev->controller_dev;
  41         struct dm_usb_ops *ops = usb_get_ops(bus);
  42
  43         if (!ops->interrupt)
  44                 return -ENOSYS;
  45
  46         return ops->interrupt(bus, udev, pipe, buffer, length, interval);
  47 }
  48
  49 int submit_control_msg(struct usb_device *udev, unsigned long pipe,
  50                        void *buffer, int length, struct devrequest *setup)
  51 {
  52         struct udevice *bus = udev->controller_dev;
  53         struct dm_usb_ops *ops = usb_get_ops(bus);
  54         struct usb_uclass_priv *uc_priv = bus->uclass->priv;
  55         int err;
  56
  57         if (!ops->control)
  58                 return -ENOSYS;
  59
  60         err = ops->control(bus, udev, pipe, buffer, length, setup);
  61         if (setup->request == USB_REQ_SET_FEATURE &&
  62             setup->requesttype == USB_RT_PORT &&
  63             setup->value == cpu_to_le16(USB_PORT_FEAT_RESET) &&
  64             err == -ENXIO) {
  65                 /* Device handed over to companion after port reset */
  66                 uc_priv->companion_device_count++;
  67         }
  68
  69         return err;
  70 }
  71
  72 int submit_bulk_msg(struct usb_device *udev, unsigned long pipe, void *buffer,
  73                     int length)
  74 {
  75         struct udevice *bus = udev->controller_dev;
  76         struct dm_usb_ops *ops = usb_get_ops(bus);
  77
  78         if (!ops->bulk)
  79                 return -ENOSYS;
  80
  81         return ops->bulk(bus, udev, pipe, buffer, length);
  82 }
  83
  84 struct int_queue *create_int_queue(struct usb_device *udev,
  85                 unsigned long pipe, int queuesize, int elementsize,
  86                 void *buffer, int interval)
  87 {
  88         struct udevice *bus = udev->controller_dev;
  89         struct dm_usb_ops *ops = usb_get_ops(bus);
  90
  91         if (!ops->create_int_queue)
  92                 return NULL;
  93
  94         return ops->create_int_queue(bus, udev, pipe, queuesize, elementsize,
  95                                      buffer, interval);
  96 }
  97
  98 void *poll_int_queue(struct usb_device *udev, struct int_queue *queue)
  99 {
 100         struct udevice *bus = udev->controller_dev;
 101         struct dm_usb_ops *ops = usb_get_ops(bus);
 102
 103         if (!ops->poll_int_queue)
 104                 return NULL;
 105
 106         return ops->poll_int_queue(bus, udev, queue);
 107 }
 108
 109 int destroy_int_queue(struct usb_device *udev, struct int_queue *queue)
 110 {
 111         struct udevice *bus = udev->controller_dev;
 112         struct dm_usb_ops *ops = usb_get_ops(bus);
 113
 114         if (!ops->destroy_int_queue)
 115                 return -ENOSYS;
 116
 117         return ops->destroy_int_queue(bus, udev, queue);
 118 }
 119
 120 int usb_alloc_device(struct usb_device *udev)
 121 {
 122         struct udevice *bus = udev->controller_dev;
 123         struct dm_usb_ops *ops = usb_get_ops(bus);
 124
 125         /* This is only requird by some controllers - current XHCI */
 126         if (!ops->alloc_device)
 127                 return 0;
 128
 129         return ops->alloc_device(bus, udev);
 130 }
 131
 132 int usb_reset_root_port(struct usb_device *udev)
 133 {
 134         struct udevice *bus = udev->controller_dev;
 135         struct dm_usb_ops *ops = usb_get_ops(bus);
 136
 137         if (!ops->reset_root_port)
 138                 return -ENOSYS;
 139
 140         return ops->reset_root_port(bus, udev);
 141 }
 142
 143 int usb_stop(void)
 144 {
 145         struct udevice *bus;
 146         struct uclass *uc;
 147         struct usb_uclass_priv *uc_priv;
 148         int err = 0, ret;
 149
 150         /* De-activate any devices that have been activated */
 151         ret = uclass_get(UCLASS_USB, &uc);
 152         if (ret)
 153                 return ret;
 154
 155         uc_priv = uc->priv;
 156
 157         uclass_foreach_dev(bus, uc) {
 158                 ret = device_remove(bus);
 159                 if (ret && !err)
 160                         err = ret;
 161         }
 162 #ifdef CONFIG_BLK
 163         ret = blk_unbind_all(IF_TYPE_USB);
 164         if (ret && !err)
 165                 err = ret;
 166 #endif
 167 #ifdef CONFIG_SANDBOX
 168         struct udevice *dev;
 169
 170         /* Reset all enulation devices */
 171         ret = uclass_get(UCLASS_USB_EMUL, &uc);
 172         if (ret)
 173                 return ret;
 174
 175         uclass_foreach_dev(dev, uc)
 176                 usb_emul_reset(dev);
 177 #endif
 178 #ifdef CONFIG_USB_STORAGE
 179         usb_stor_reset();
 180 #endif
 181         usb_hub_reset();
 182         uc_priv->companion_device_count = 0;
 183         usb_started = 0;
 184
 185         return err;
 186 }
 187
 188 static void usb_scan_bus(struct udevice *bus, bool recurse)
 189 {
 190         struct usb_bus_priv *priv;
 191         struct udevice *dev;
 192         int ret;
 193
 194         priv = dev_get_uclass_priv(bus);
 195
 196         assert(recurse);        /* TODO: Support non-recusive */
 197
 198         printf("scanning bus %d for devices... ", bus->seq);
 199         debug("\n");
 200         ret = usb_scan_device(bus, 0, USB_SPEED_FULL, &dev);
 201         if (ret)
 202                 printf("failed, error %d\n", ret);
 203         else if (priv->next_addr == 0)
 204                 printf("No USB Device found\n");
 205         else
 206                 printf("%d USB Device(s) found\n", priv->next_addr);
 207 }
 208
 209 static void remove_inactive_children(struct uclass *uc, struct udevice *bus)
 210 {
 211         uclass_foreach_dev(bus, uc) {
 212                 struct udevice *dev, *next;
 213
 214                 if (!device_active(bus))
 215                         continue;
 216                 device_foreach_child_safe(dev, next, bus) {
 217                         if (!device_active(dev))
 218                                 device_unbind(dev);
 219                 }
 220         }
 221 }
 222
 223 int usb_init(void)
 224 {
 225         int controllers_initialized = 0;
 226         struct usb_uclass_priv *uc_priv;
 227         struct usb_bus_priv *priv;
 228         struct udevice *bus;
 229         struct uclass *uc;
 230         int count = 0;
 231         int ret;
 232
 233         asynch_allowed = 1;
 234         usb_hub_reset();
 235
 236         ret = uclass_get(UCLASS_USB, &uc);
 237         if (ret)
 238                 return ret;
 239
 240         uc_priv = uc->priv;
 241
 242         uclass_foreach_dev(bus, uc) {
 243                 /* init low_level USB */
 244                 printf("USB%d:   ", count);
 245                 count++;
 246                 ret = device_probe(bus);
 247                 if (ret == -ENODEV) {   /* No such device. */
 248                         puts("Port not available.\n");
 249                         controllers_initialized++;
 250                         continue;
 251                 }
 252
 253                 if (ret) {              /* Other error. */
 254                         printf("probe failed, error %d\n", ret);
 255                         continue;
 256                 }
 257                 controllers_initialized++;
 258                 usb_started = true;
 259         }
 260
 261         /*
 262          * lowlevel init done, now scan the bus for devices i.e. search HUBs
 263          * and configure them, first scan primary controllers.
 264          */
 265         uclass_foreach_dev(bus, uc) {
 266                 if (!device_active(bus))
 267                         continue;
 268
 269                 priv = dev_get_uclass_priv(bus);
 270                 if (!priv->companion)
 271                         usb_scan_bus(bus, true);
 272         }
 273
 274         /*
 275          * Now that the primary controllers have been scanned and have handed
 276          * over any devices they do not understand to their companions, scan
 277          * the companions if necessary.
 278          */
 279         if (uc_priv->companion_device_count) {
 280                 uclass_foreach_dev(bus, uc) {
 281                         if (!device_active(bus))
 282                                 continue;
 283
 284                         priv = dev_get_uclass_priv(bus);
 285                         if (priv->companion)
 286                                 usb_scan_bus(bus, true);
 287                 }
 288         }
 289
 290         debug("scan end\n");
 291
 292         /* Remove any devices that were not found on this scan */
 293         remove_inactive_children(uc, bus);
 294
 295         ret = uclass_get(UCLASS_USB_HUB, &uc);
 296         if (ret)
 297                 return ret;
 298         remove_inactive_children(uc, bus);
 299
 300         /* if we were not able to find at least one working bus, bail out */
 301         if (!count)
 302                 printf("No controllers found\n");
 303         else if (controllers_initialized == 0)
 304                 printf("USB error: all controllers failed lowlevel init\n");
 305
 306         return usb_started ? 0 : -1;
 307 }
 308
 309 /*
 310  * TODO(sjg@chromium.org): Remove this legacy function. At present it is needed
 311  * to support boards which use driver model for USB but not Ethernet, and want
 312  * to use USB Ethernet.
 313  *
 314  * The #if clause is here to ensure that remains the only case.
 315  */
 316 #if !defined(CONFIG_DM_ETH) && defined(CONFIG_USB_HOST_ETHER)
 317 static struct usb_device *find_child_devnum(struct udevice *parent, int devnum)
 318 {
 319         struct usb_device *udev;
 320         struct udevice *dev;
 321
 322         if (!device_active(parent))
 323                 return NULL;
 324         udev = dev_get_parent_priv(parent);
 325         if (udev->devnum == devnum)
 326                 return udev;
 327
 328         for (device_find_first_child(parent, &dev);
 329              dev;
 330              device_find_next_child(&dev)) {
 331                 udev = find_child_devnum(dev, devnum);
 332                 if (udev)
 333                         return udev;
 334         }
 335
 336         return NULL;
 337 }
 338
 339 struct usb_device *usb_get_dev_index(struct udevice *bus, int index)
 340 {
 341         struct udevice *dev;
 342         int devnum = index + 1; /* Addresses are allocated from 1 on USB */
 343
 344         device_find_first_child(bus, &dev);
 345         if (!dev)
 346                 return NULL;
 347
 348         return find_child_devnum(dev, devnum);
 349 }
 350 #endif
 351
 352 int usb_post_bind(struct udevice *dev)
 353 {
 354         /* Scan the bus for devices */
 355         return dm_scan_fdt_node(dev, gd->fdt_blob, dev->of_offset, false);
 356 }
 357
 358 int usb_setup_ehci_gadget(struct ehci_ctrl **ctlrp)
 359 {
 360         struct usb_platdata *plat;
 361         struct udevice *dev;
 362         int ret;
 363
 364         /* Find the old device and remove it */
 365         ret = uclass_find_device_by_seq(UCLASS_USB, 0, true, &dev);
 366         if (ret)
 367                 return ret;
 368         ret = device_remove(dev);
 369         if (ret)
 370                 return ret;
 371
 372         plat = dev_get_platdata(dev);
 373         plat->init_type = USB_INIT_DEVICE;
 374         ret = device_probe(dev);
 375         if (ret)
 376                 return ret;
 377         *ctlrp = dev_get_priv(dev);
 378
 379         return 0;
 380 }
 381
 382 /* returns 0 if no match, 1 if match */
 383 int usb_match_device(const struct usb_device_descriptor *desc,
 384                      const struct usb_device_id *id)
 385 {
 386         if ((id->match_flags & USB_DEVICE_ID_MATCH_VENDOR) &&
 387             id->idVendor != le16_to_cpu(desc->idVendor))
 388                 return 0;
 389
 390         if ((id->match_flags & USB_DEVICE_ID_MATCH_PRODUCT) &&
 391             id->idProduct != le16_to_cpu(desc->idProduct))
 392                 return 0;
 393
 394         /* No need to test id->bcdDevice_lo != 0, since 0 is never
 395            greater than any unsigned number. */
 396         if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_LO) &&
 397             (id->bcdDevice_lo > le16_to_cpu(desc->bcdDevice)))
 398                 return 0;
 399
 400         if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_HI) &&
 401             (id->bcdDevice_hi < le16_to_cpu(desc->bcdDevice)))
 402                 return 0;
 403
 404         if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_CLASS) &&
 405             (id->bDeviceClass != desc->bDeviceClass))
 406                 return 0;
 407
 408         if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_SUBCLASS) &&
 409             (id->bDeviceSubClass != desc->bDeviceSubClass))
 410                 return 0;
 411
 412         if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_PROTOCOL) &&
 413             (id->bDeviceProtocol != desc->bDeviceProtocol))
 414                 return 0;
 415
 416         return 1;
 417 }
 418
 419 /* returns 0 if no match, 1 if match */
 420 int usb_match_one_id_intf(const struct usb_device_descriptor *desc,
 421                           const struct usb_interface_descriptor *int_desc,
 422                           const struct usb_device_id *id)
 423 {
 424         /* The interface class, subclass, protocol and number should never be
 425          * checked for a match if the device class is Vendor Specific,
 426          * unless the match record specifies the Vendor ID. */
 427         if (desc->bDeviceClass == USB_CLASS_VENDOR_SPEC &&
 428             !(id->match_flags & USB_DEVICE_ID_MATCH_VENDOR) &&
 429             (id->match_flags & (USB_DEVICE_ID_MATCH_INT_CLASS |
 430                                 USB_DEVICE_ID_MATCH_INT_SUBCLASS |
 431                                 USB_DEVICE_ID_MATCH_INT_PROTOCOL |
 432                                 USB_DEVICE_ID_MATCH_INT_NUMBER)))
 433                 return 0;
 434
 435         if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_CLASS) &&
 436             (id->bInterfaceClass != int_desc->bInterfaceClass))
 437                 return 0;
 438
 439         if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_SUBCLASS) &&
 440             (id->bInterfaceSubClass != int_desc->bInterfaceSubClass))
 441                 return 0;
 442
 443         if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_PROTOCOL) &&
 444             (id->bInterfaceProtocol != int_desc->bInterfaceProtocol))
 445                 return 0;
 446
 447         if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_NUMBER) &&
 448             (id->bInterfaceNumber != int_desc->bInterfaceNumber))
 449                 return 0;
 450
 451         return 1;
 452 }
 453
 454 /* returns 0 if no match, 1 if match */
 455 int usb_match_one_id(struct usb_device_descriptor *desc,
 456                      struct usb_interface_descriptor *int_desc,
 457                      const struct usb_device_id *id)
 458 {
 459         if (!usb_match_device(desc, id))
 460                 return 0;
 461
 462         return usb_match_one_id_intf(desc, int_desc, id);
 463 }
 464
 465 /**
 466  * usb_find_and_bind_driver() - Find and bind the right USB driver
 467  *
 468  * This only looks at certain fields in the descriptor.
 469  */
 470 static int usb_find_and_bind_driver(struct udevice *parent,
 471                                     struct usb_device_descriptor *desc,
 472                                     struct usb_interface_descriptor *iface,
 473                                     int bus_seq, int devnum,
 474                                     struct udevice **devp)
 475 {
 476         struct usb_driver_entry *start, *entry;
 477         int n_ents;
 478         int ret;
 479         char name[30], *str;
 480
 481         *devp = NULL;
 482         debug("%s: Searching for driver\n", __func__);
 483         start = ll_entry_start(struct usb_driver_entry, usb_driver_entry);
 484         n_ents = ll_entry_count(struct usb_driver_entry, usb_driver_entry);
 485         for (entry = start; entry != start + n_ents; entry++) {
 486                 const struct usb_device_id *id;
 487                 struct udevice *dev;
 488                 const struct driver *drv;
 489                 struct usb_dev_platdata *plat;
 490
 491                 for (id = entry->match; id->match_flags; id++) {
 492                         if (!usb_match_one_id(desc, iface, id))
 493                                 continue;
 494
 495                         drv = entry->driver;
 496                         /*
 497                          * We could pass the descriptor to the driver as
 498                          * platdata (instead of NULL) and allow its bind()
 499                          * method to return -ENOENT if it doesn't support this
 500                          * device. That way we could continue the search to
 501                          * find another driver. For now this doesn't seem
 502                          * necesssary, so just bind the first match.
 503                          */
 504                         ret = device_bind(parent, drv, drv->name, NULL, -1,
 505                                           &dev);
 506                         if (ret)
 507                                 goto error;
 508                         debug("%s: Match found: %s\n", __func__, drv->name);
 509                         dev->driver_data = id->driver_info;
 510                         plat = dev_get_parent_platdata(dev);
 511                         plat->id = *id;
 512                         *devp = dev;
 513                         return 0;
 514                 }
 515         }
 516
 517         /* Bind a generic driver so that the device can be used */
 518         snprintf(name, sizeof(name), "generic_bus_%x_dev_%x", bus_seq, devnum);
 519         str = strdup(name);
 520         if (!str)
 521                 return -ENOMEM;
 522         ret = device_bind_driver(parent, "usb_dev_generic_drv", str, devp);
 523
 524 error:
 525         debug("%s: No match found: %d\n", __func__, ret);
 526         return ret;
 527 }
 528
 529 /**
 530  * usb_find_child() - Find an existing device which matches our needs
 531  *
 532  *
 533  */
 534 static int usb_find_child(struct udevice *parent,
 535                           struct usb_device_descriptor *desc,
 536                           struct usb_interface_descriptor *iface,
 537                           struct udevice **devp)
 538 {
 539         struct udevice *dev;
 540
 541         *devp = NULL;
 542         for (device_find_first_child(parent, &dev);
 543              dev;
 544              device_find_next_child(&dev)) {
 545                 struct usb_dev_platdata *plat = dev_get_parent_platdata(dev);
 546
 547                 /* If this device is already in use, skip it */
 548                 if (device_active(dev))
 549                         continue;
 550                 debug("   %s: name='%s', plat=%d, desc=%d\n", __func__,
 551                       dev->name, plat->id.bDeviceClass, desc->bDeviceClass);
 552                 if (usb_match_one_id(desc, iface, &plat->id)) {
 553                         *devp = dev;
 554                         return 0;
 555                 }
 556         }
 557
 558         return -ENOENT;
 559 }
 560
 561 int usb_scan_device(struct udevice *parent, int port,
 562                     enum usb_device_speed speed, struct udevice **devp)
 563 {
 564         struct udevice *dev;
 565         bool created = false;
 566         struct usb_dev_platdata *plat;
 567         struct usb_bus_priv *priv;
 568         struct usb_device *parent_udev;
 569         int ret;
 570         ALLOC_CACHE_ALIGN_BUFFER(struct usb_device, udev, 1);
 571         struct usb_interface_descriptor *iface = &udev->config.if_desc[0].desc;
 572
 573         *devp = NULL;
 574         memset(udev, '\0', sizeof(*udev));
 575         udev->controller_dev = usb_get_bus(parent);
 576         priv = dev_get_uclass_priv(udev->controller_dev);
 577
 578         /*
 579          * Somewhat nasty, this. We create a local device and use the normal
 580          * USB stack to read its descriptor. Then we know what type of device
 581          * to create for real.
 582          *
 583          * udev->dev is set to the parent, since we don't have a real device
 584          * yet. The USB stack should not access udev.dev anyway, except perhaps
 585          * to find the controller, and the controller will either be @parent,
 586          * or some parent of @parent.
 587          *
 588          * Another option might be to create the device as a generic USB
 589          * device, then morph it into the correct one when we know what it
 590          * should be. This means that a generic USB device would morph into
 591          * a network controller, or a USB flash stick, for example. However,
 592          * we don't support such morphing and it isn't clear that it would
 593          * be easy to do.
 594          *
 595          * Yet another option is to split out the USB stack parts of udev
 596          * into something like a 'struct urb' (as Linux does) which can exist
 597          * independently of any device. This feels cleaner, but calls for quite
 598          * a big change to the USB stack.
 599          *
 600          * For now, the approach is to set up an empty udev, read its
 601          * descriptor and assign it an address, then bind a real device and
 602          * stash the resulting information into the device's parent
 603          * platform data. Then when we probe it, usb_child_pre_probe() is called
 604          * and it will pull the information out of the stash.
 605          */
 606         udev->dev = parent;
 607         udev->speed = speed;
 608         udev->devnum = priv->next_addr + 1;
 609         udev->portnr = port;
 610         debug("Calling usb_setup_device(), portnr=%d\n", udev->portnr);
 611         parent_udev = device_get_uclass_id(parent) == UCLASS_USB_HUB ?
 612                 dev_get_parent_priv(parent) : NULL;
 613         ret = usb_setup_device(udev, priv->desc_before_addr, parent_udev);
 614         debug("read_descriptor for '%s': ret=%d\n", parent->name, ret);
 615         if (ret)
 616                 return ret;
 617         ret = usb_find_child(parent, &udev->descriptor, iface, &dev);
 618         debug("** usb_find_child returns %d\n", ret);
 619         if (ret) {
 620                 if (ret != -ENOENT)
 621                         return ret;
 622                 ret = usb_find_and_bind_driver(parent, &udev->descriptor, iface,
 623                                                udev->controller_dev->seq,
 624                                                udev->devnum, &dev);
 625                 if (ret)
 626                         return ret;
 627                 created = true;
 628         }
 629         plat = dev_get_parent_platdata(dev);
 630         debug("%s: Probing '%s', plat=%p\n", __func__, dev->name, plat);
 631         plat->devnum = udev->devnum;
 632         plat->udev = udev;
 633         priv->next_addr++;
 634         ret = device_probe(dev);
 635         if (ret) {
 636                 debug("%s: Device '%s' probe failed\n", __func__, dev->name);
 637                 priv->next_addr--;
 638                 if (created)
 639                         device_unbind(dev);
 640                 return ret;
 641         }
 642         *devp = dev;
 643
 644         return 0;
 645 }
 646
 647 /*
 648  * Detect if a USB device has been plugged or unplugged.
 649  */
 650 int usb_detect_change(void)
 651 {
 652         struct udevice *hub;
 653         struct uclass *uc;
 654         int change = 0;
 655         int ret;
 656
 657         ret = uclass_get(UCLASS_USB_HUB, &uc);
 658         if (ret)
 659                 return ret;
 660
 661         uclass_foreach_dev(hub, uc) {
 662                 struct usb_device *udev;
 663                 struct udevice *dev;
 664
 665                 if (!device_active(hub))
 666                         continue;
 667                 for (device_find_first_child(hub, &dev);
 668                      dev;
 669                      device_find_next_child(&dev)) {
 670                         struct usb_port_status status;
 671
 672                         if (!device_active(dev))
 673                                 continue;
 674
 675                         udev = dev_get_parent_priv(dev);
 676                         if (usb_get_port_status(udev, udev->portnr, &status)
 677                                         < 0)
 678                                 /* USB request failed */
 679                                 continue;
 680
 681                         if (le16_to_cpu(status.wPortChange) &
 682                             USB_PORT_STAT_C_CONNECTION)
 683                                 change++;
 684                 }
 685         }
 686
 687         return change;
 688 }
 689
 690 int usb_child_post_bind(struct udevice *dev)
 691 {
 692         struct usb_dev_platdata *plat = dev_get_parent_platdata(dev);
 693         const void *blob = gd->fdt_blob;
 694         int val;
 695
 696         if (dev->of_offset == -1)
 697                 return 0;
 698
 699         /* We only support matching a few things */
 700         val = fdtdec_get_int(blob, dev->of_offset, "usb,device-class", -1);
 701         if (val != -1) {
 702                 plat->id.match_flags |= USB_DEVICE_ID_MATCH_DEV_CLASS;
 703                 plat->id.bDeviceClass = val;
 704         }
 705         val = fdtdec_get_int(blob, dev->of_offset, "usb,interface-class", -1);
 706         if (val != -1) {
 707                 plat->id.match_flags |= USB_DEVICE_ID_MATCH_INT_CLASS;
 708                 plat->id.bInterfaceClass = val;
 709         }
 710
 711         return 0;
 712 }
 713
 714 struct udevice *usb_get_bus(struct udevice *dev)
 715 {
 716         struct udevice *bus;
 717
 718         for (bus = dev; bus && device_get_uclass_id(bus) != UCLASS_USB; )
 719                 bus = bus->parent;
 720         if (!bus) {
 721                 /* By design this cannot happen */
 722                 assert(bus);
 723                 debug("USB HUB '%s' does not have a controller\n", dev->name);
 724         }
 725
 726         return bus;
 727 }
 728
 729 int usb_child_pre_probe(struct udevice *dev)
 730 {
 731         struct usb_device *udev = dev_get_parent_priv(dev);
 732         struct usb_dev_platdata *plat = dev_get_parent_platdata(dev);
 733         int ret;
 734
 735         if (plat->udev) {
 736                 /*
 737                  * Copy over all the values set in the on stack struct
 738                  * usb_device in usb_scan_device() to our final struct
 739                  * usb_device for this dev.
 740                  */
 741                 *udev = *(plat->udev);
 742                 /* And clear plat->udev as it will not be valid for long */
 743                 plat->udev = NULL;
 744                 udev->dev = dev;
 745         } else {
 746                 /*
 747                  * This happens with devices which are explicitly bound
 748                  * instead of being discovered through usb_scan_device()
 749                  * such as sandbox emul devices.
 750                  */
 751                 udev->dev = dev;
 752                 udev->controller_dev = usb_get_bus(dev);
 753                 udev->devnum = plat->devnum;
 754
 755                 /*
 756                  * udev did not go through usb_scan_device(), so we need to
 757                  * select the config and read the config descriptors.
 758                  */
 759                 ret = usb_select_config(udev);
 760                 if (ret)
 761                         return ret;
 762         }
 763
 764         return 0;
 765 }
 766
 767 UCLASS_DRIVER(usb) = {
 768         .id             = UCLASS_USB,
 769         .name           = "usb",
 770         .flags          = DM_UC_FLAG_SEQ_ALIAS,
 771         .post_bind      = usb_post_bind,
 772         .priv_auto_alloc_size = sizeof(struct usb_uclass_priv),
 773         .per_child_auto_alloc_size = sizeof(struct usb_device),
 774         .per_device_auto_alloc_size = sizeof(struct usb_bus_priv),
 775         .child_post_bind = usb_child_post_bind,
 776         .child_pre_probe = usb_child_pre_probe,
 777         .per_child_platdata_auto_alloc_size = sizeof(struct usb_dev_platdata),
 778 };
 779
 780 UCLASS_DRIVER(usb_dev_generic) = {
 781         .id             = UCLASS_USB_DEV_GENERIC,
 782         .name           = "usb_dev_generic",
 783 };
 784
 785 U_BOOT_DRIVER(usb_dev_generic_drv) = {
 786         .id             = UCLASS_USB_DEV_GENERIC,
 787         .name           = "usb_dev_generic_drv",
 788 };